U.S. patent application number 15/533557 was filed with the patent office on 2017-11-23 for crankshaft for rotatory compressor, rotatory compressor and refrigerating cycle device.
The applicant listed for this patent is Guangdong Meizhi Compressor Co., Ltd.. Invention is credited to Kaicheng YANG, Jijiang YU, Yangbo YU.
Application Number | 20170335849 15/533557 |
Document ID | / |
Family ID | 57248761 |
Filed Date | 2017-11-23 |
United States Patent
Application |
20170335849 |
Kind Code |
A1 |
YANG; Kaicheng ; et
al. |
November 23, 2017 |
CRANKSHAFT FOR ROTATORY COMPRESSOR, ROTATORY COMPRESSOR AND
REFRIGERATING CYCLE DEVICE
Abstract
A crankshaft for a rotary compressor includes: a body (1) and an
eccentric portion (2), the eccentric portion (2) being fitted over
the body (1), wherein at least one of a flexible structure (21) and
an oil pressure surface (22) is arranged on the eccentric portion
(2). The flexible structure (21) is configured to deform inwards
when subject to an external force in an inward direction. The oil
pressure surface (22) is configured in such a way that in a
direction opposite to a rotating direction of a rotating central
axis of a crankshaft (300), a distance between a front end (221) of
the oil pressure surface (22) and the central axis of the eccentric
portion (2) is smaller than a distance between a tail end (222) of
the oil pressure surface (22) and the central axis of the eccentric
portion (2). Also disclosed are a rotary compressor and a
refrigerating cycle device. The crankshaft can effectively solve
the problem that a rotary compressor gets stuck due to abnormal
contact between a piston and an air cylinder, and a high-pressure
oil wedge can be formed at a tail portion of an oil cavity, thereby
increasing an inlet oil pressure, and improving the environment of
lubrication between an eccentric portion and a piston.
Inventors: |
YANG; Kaicheng; (Foshan,
CN) ; YU; Jijiang; (Foshan, CN) ; YU;
Yangbo; (Foshan, CN) |
|
Applicant: |
Name |
City |
State |
Country |
Type |
Guangdong Meizhi Compressor Co., Ltd. |
Foshan |
|
CN |
|
|
Family ID: |
57248761 |
Appl. No.: |
15/533557 |
Filed: |
May 8, 2015 |
PCT Filed: |
May 8, 2015 |
PCT NO: |
PCT/CN2015/078608 |
371 Date: |
June 6, 2017 |
Current U.S.
Class: |
1/1 |
Current CPC
Class: |
F04C 29/0057 20130101;
F04C 29/02 20130101; F04C 2240/30 20130101; F25B 1/04 20130101;
F25B 2500/16 20130101; F04C 2240/50 20130101; F04C 18/356 20130101;
F04C 2240/60 20130101 |
International
Class: |
F04C 29/00 20060101
F04C029/00; F25B 1/04 20060101 F25B001/04; F04C 18/356 20060101
F04C018/356; F04C 29/02 20060101 F04C029/02 |
Claims
1. A crankshaft for a rotary compressor, comprising: a body; and an
eccentric portion fitted over the body and provided with at least
one of a flexible structure and an oil pressure surface, wherein
the flexible structure is configured to deform inwards when subject
to an external force in an inward direction, and the oil pressure
surface is configured in such a way that in a direction opposite to
a rotating direction of a rotating central axis of the crankshaft,
a distance between a front end of the oil pressure surface and the
central axis of the eccentric portion is smaller than a distance
between a tail end of the oil pressure surface and the central axis
of the eccentric portion.
2. The crankshaft for a rotary compressor according to claim 1,
wherein the eccentric portion is provided with the flexible
structure; the flexible structure has a first end and a second end,
the first end of the flexible structure being connected to a first
side wall of the eccentric portion and the second end of the
flexible structure being spaced apart from the first side wall of
the eccentric portion.
3. The crankshaft for a rotary compressor according to claim 2,
wherein the oil pressure surface is formed on a second side wall,
opposite to the second end of the flexible structure, of the
eccentric portion.
4. The crankshaft for a rotary compressor according to claim 3,
wherein the oil pressure surface is formed to be a smooth curved
surface or a combination of a curved surface and a flat
surface.
5. The crankshaft for a rotary compressor according to claim 2,
wherein the flexible structure and the central axis of the
eccentric portion are located at a same side of a central axis of
the body.
6. The crankshaft for a rotary compressor according to claim 5,
wherein the first end and the second end of the flexible structure
are located at two sides of a reference plane respectively, and the
reference plane is a plane formed by the central axis of the
eccentric portion and the central axis of the body.
7. The crankshaft for a rotary compressor according to claim 6,
wherein a distance d2 between the farthest point from the central
axis of the eccentric portion, among intersection points of the
flexible structure and the reference plane, and the central axis of
the eccentric portion satisfies: d2.gtoreq.R0, wherein R0 is an
outer radius of the eccentric portion.
8. The crankshaft for a rotary compressor according to claim 1,
wherein the eccentric portion is provided with the flexible
structure; the flexible structure has a first end and a second end,
both the first end and the second end of the flexible structure
being connected to a side wall of the eccentric portion and other
portions of the flexible structure except the first end and the
second end being spaced apart from the side wall of the eccentric
portion.
9. The crankshaft for a rotary compressor according to claim 1,
wherein the eccentric portion is provided with the oil pressure
surface, and two ends of the oil pressure surface in an axial
direction of the eccentric portion are adjacent to two end faces of
the eccentric portion respectively.
10. The crankshaft for a rotary compressor according to claim 9,
wherein the two ends of the oil pressure surface adjoin the
respective end faces of the eccentric portion directly.
11. The crankshaft for a rotary compressor according to claim 1,
wherein the eccentric portion is provided with the oil pressure
surface, and a communicating oil hole communicated with a central
oil hole of the body is formed in the oil pressure surface.
12. A rotary compressor, comprising: a casing; a compressing
mechanism disposed in the casing and having a working chamber; and
a crankshaft for a rotary compressor, the crankshaft for the rotary
compressor comprises: a body; and an eccentric portion fitted over
the body and provided with at least one of a flexible structure and
an oil pressure surface, wherein the flexible structure is
configured to deform inwards when subject to an external force in
an inward direction, and the oil pressure surface is configured in
such a way that in a direction opposite to a rotating direction of
a rotating central axis of the crankshaft, a distance between a
front end of the oil pressure surface and the central axis of the
eccentric portion is smaller than a distance between a tail end of
the oil pressure surface and the central axis of the eccentric
portion, wherein an end of the crankshaft goes through the
compressing mechanism, and the eccentric portion of the crankshaft
is located in the working chamber.
13. A refrigerating cycle device, comprising a rotary compressor,
the rotary compressor comprises: a casing; a compressing mechanism
disposed in the casing and having a working chamber; and a
crankshaft for a rotary compressor, the crankshaft for the rotary
compressor comprises: a body; and an eccentric portion fitted over
the body and provided with at least one of a flexible structure and
an oil pressure surface, wherein the flexible structure is
configured to deform inwards when subject to an external force in
an inward direction, and the oil pressure surface is configured in
such a way that in a direction opposite to a rotating direction of
a rotating central axis of the crankshaft, a distance between a
front end of the oil pressure surface and the central axis of the
eccentric portion is smaller than a distance between a tail end of
the oil pressure surface and the central axis of the eccentric
portion, wherein an end of the crankshaft goes through the
compressing mechanism, and the eccentric portion of the crankshaft
is located in the working chamber.
14. The crankshaft for a rotary compressor according to claim 5,
wherein the oil pressure surface is formed on a second side wall,
opposite to the second end of the flexible structure, of the
eccentric portion.
15. The crankshaft for a rotary compressor according to claim 14,
wherein the oil pressure surface is formed to be a smooth curved
surface or a combination of a curved surface and a flat
surface.
16. The crankshaft for a rotary compressor according to claim 14,
wherein the oil pressure surface is formed on a second side wall,
opposite to the second end of the flexible structure, of the
eccentric portion.
17. The crankshaft for a rotary compressor according to claim 15,
wherein the oil pressure surface is formed to be a smooth curved
surface or a combination of a curved surface and a flat
surface.
18. The crankshaft for a rotary compressor according to claim 7,
wherein the oil pressure surface is formed on a second side wall,
opposite to the second end of the flexible structure, of the
eccentric portion.
19. The crankshaft for a rotary compressor according to claim 18,
wherein the oil pressure surface is formed to be a smooth curved
surface or a combination of a curved surface and a flat
surface.
20. The crankshaft for a rotary compressor according to claim 11,
wherein the eccentric portion is provided with the flexible
structure; the flexible structure has a first end and a second end,
the first end of the flexible structure being connected to a first
side wall of the eccentric portion and the second end of the
flexible structure being spaced apart from the first side wall of
the eccentric portion.
Description
CROSS-REFERENCE TO RELATED APPLICATIONS
[0001] The present application is a national phase entry under 35
USC .sctn.371 of International Application PCT/CN2015/078608, filed
May 8, 2015, the entire disclosure of which is incorporated herein
by reference.
FIELD
[0002] The present disclosure relates to a technical field of
compressor manufacture, and specifically, to a crankshaft for a
rotatory compressor, a rotatory compressor and a refrigerating
cycle device.
BACKGROUND
[0003] In the related art, in order to guarantee a volumetric
efficiency of a rotatory compressor, a gap exists between an inner
wall of a cylinder and an outer wall of a piston. However, a
compressing mechanism is usually stuck at the smallest gap if an
inner radius of the cylinder deforms after assembly or impurities
exist in the compressing mechanism, thus causing an abnormal
blockage of rotation of the rotatory compressor.
[0004] In addition, the piston and an eccentric portion of a
crankshaft are supplied with oil relying on an oil hole in the
eccentric portion, so problems like a low oil pressure and a poor
lubrication performance exist. Meanwhile, a contact area as well as
a friction factor between the eccentric portion of the crankshaft
and the inner wall of the piston is large, which causes a large
input power of the rotatory compressor.
SUMMARY
[0005] The present disclosure seeks to solve one of the technical
problems existing in the related art. Accordingly, a crankshaft for
a rotary compressor is provided in the present disclosure, and the
crankshaft is able to absorb an abnormal contact force between a
piston and the crankshaft or improve a condition of lubrication
between the crankshaft and the piston.
[0006] A rotary compressor having the above crankshaft is further
provided in the present disclosure.
[0007] A refrigerating cycle device having the above rotary
compressor is further provided in the present disclosure.
[0008] The crankshaft for the rotary compressor according to
embodiments of a first aspect of the present disclosure includes a
body and an eccentric portion. The eccentric portion is fitted over
the body and provided with at least one of a flexible structure and
an oil pressure surface, in which the flexible structure is
configured to deform inwards when subject to an external force in
an inward direction, and the oil pressure surface is configured in
such a way that in a direction opposite to a rotating direction of
a rotating central axis of the crankshaft, a distance between a
front end of the oil pressure surface and the central axis of the
eccentric portion is smaller than a distance between a tail end of
the oil pressure surface and the central axis of the eccentric
portion.
[0009] For the crankshaft configured for the rotary compressor
according to embodiments of the present disclosure, when the
eccentric portion is provided with the flexible structure having
the above structural features, the problem that a rotary compressor
gets stuck due to abnormal contact between the piston and the
cylinder can be solved effectively; when the eccentric portion is
provided with the oil pressure surface having the above structural
features, a high-pressure oil wedge can be formed at a tail portion
of the oil cavity by utilizing the rotating centrifugal force from
the crankshaft rotating at a high speed, thereby increasing an
inlet oil pressure, and improving the environment of lubrication
between the eccentric portion and the piston.
[0010] According to an example of the present disclosure, the
eccentric portion is provided with the flexible structure. The
flexible structure has a first end and a second end, the first end
of the flexible structure being connected to a first side wall of
the eccentric portion and the second end of the flexible structure
being spaced apart from the first side wall of the eccentric
portion.
[0011] According to an example of the present disclosure, the oil
pressure surface is formed on a second side wall, opposite to the
second end of the flexible structure, of the eccentric portion.
[0012] According to an example of the present disclosure, the oil
pressure surface is formed to be a smooth curved surface or a
combination of a curved surface and a flat surface.
[0013] According to an example of the present disclosure, the
flexible structure and the central axis of the eccentric portion
are located at a same side of a central axis of the body.
[0014] According to an example of the present disclosure, the first
end and the second end of the flexible structure are located at two
sides of a reference plane respectively, and the reference plane is
a plane formed by the central axis of the eccentric portion and the
central axis of the body.
[0015] According to an example of the present disclosure, a
distance d2 between the farthest point from the central axis of the
eccentric portion, among intersection points of the flexible
structure and the reference plane, and the central axis of the
eccentric portion satisfies: d2.gtoreq.R0, wherein R0 is an outer
radius of the eccentric portion.
[0016] According to an example of the present disclosure, the
eccentric portion is provided with the flexible structure. The
flexible structure has a first end and a second end, both the first
end and the second end of the flexible structure being connected to
a side wall of the eccentric portion and other portions of the
flexible structure except the first end and the second end being
spaced apart from the side wall of the eccentric portion.
[0017] According to an example of the present disclosure, the
eccentric portion is provided with the oil pressure surface, and
two ends of the oil pressure surface in an axial direction of the
eccentric portion are adjacent to two end faces of the eccentric
portion respectively.
[0018] According to an example of the present disclosure, the two
ends of the oil pressure surface adjoin the respective end faces of
the eccentric portion directly.
[0019] According to an example of the present disclosure, the
eccentric portion is provided with the oil pressure surface, and a
communicating oil hole communicated with a central oil hole of the
body is formed in the oil pressure surface.
[0020] The rotary compressor according to embodiments of a second
aspect of the present disclosure includes a casing; a compressing
mechanism disposed in the casing and having a working chamber; and
a crankshaft for a rotary compressor according to embodiments of
the first aspect of the present disclosure, in which an end of the
crankshaft goes through the compressing mechanism, and the
eccentric portion of the crankshaft is located in the working
chamber.
[0021] For the rotary compressor according to embodiments of the
present disclosure, by providing the crankshaft for the rotary
compressor according to embodiments of the first aspect mentioned
above, the overall performance of the rotary compressor is
improved.
[0022] The refrigerating cycle device according to embodiments of a
third aspect of the present disclosure includes the rotary
compressor according to embodiments of the second aspect of the
present disclosure.
[0023] For the refrigerating cycle device according to embodiments
of the present disclosure, by providing the rotary compressor
according to embodiments of the second aspect mentioned above, the
overall performance of the refrigerating cycle device is
improved.
[0024] Additional aspects and advantages of the present disclosure
will be given in part in the following descriptions, become
apparent in part from the following descriptions, or be learned
from the practice of the present disclosure.
BRIEF DESCRIPTION OF THE DRAWINGS
[0025] These and other aspects and advantages of embodiments of the
present disclosure will become apparent and more readily
appreciated from the following descriptions made with reference to
the drawings, in which:
[0026] FIG. 1 is a schematic view of a rotary compressor according
to embodiments of the present disclosure;
[0027] FIG. 2 is a sectional schematic view of a compressing
mechanism shown in FIG. 1;
[0028] FIG. 3 is a partial axial view of the compressing mechanism
shown in FIG. 2;
[0029] FIG. 4 is an operational schematic view of the compressing
mechanism shown in FIG. 2;
[0030] FIG. 5 is another operational schematic view of the
compressing mechanism shown in FIG. 2;
[0031] FIG. 6 is an assembling view of a crankshaft and a piston
shown in FIG. 2;
[0032] FIG. 7 is a perspective view of a crankshaft according to a
first embodiment of the present disclosure;
[0033] FIG. 8 is a front view of the crankshaft shown in FIG.
7;
[0034] FIG. 9 and FIG. 10 are two axial views of the crankshaft
shown in FIG. 7;
[0035] FIG. 11 is a perspective view of a crankshaft according to a
second embodiment of the present disclosure;
[0036] FIG. 12 is an axial view of the crankshaft shown in FIG.
11;
[0037] FIG. 13 is a perspective view of a crankshaft according to a
third embodiment of the present disclosure;
[0038] FIG. 14 is an axial view of the crankshaft shown in FIG.
13;
[0039] FIG. 15 is a perspective view of a crankshaft according to a
fourth embodiment of the present disclosure;
[0040] FIG. 16 is a perspective view of a crankshaft according to a
fifth embodiment of the present disclosure;
[0041] FIG. 17 is an axial view of the crankshaft shown in FIG.
16.
Reference Numerals
[0042] 1000: rotary compressor;
[0043] 100: casing;
[0044] 200: compressing mechanism; 201: main bearing; 202:
cylinder; 203: auxiliary bearing; 204: sliding vane; 205:
piston;
[0045] 300: crankshaft; 1: body; 2: eccentric portion; 2a:
corresponding end face;
[0046] 21: flexible structure; 211: first end; 212: second end;
[0047] 22: oil pressure surface; 22a: first segment; 22b: second
segment; 22c: two ends; 221: front end; 222: tail end;
[0048] 23: communicating oil hole; 3: oil cavity; 3a: wedge shaped
space.
DETAILED DESCRIPTION
[0049] Embodiments of the present disclosure will be described in
detail in the following. Examples of the embodiments are shown in
the drawings, and the same or similar elements and the elements
having same or similar functions are denoted by like reference
numerals throughout the descriptions. The embodiments described
with reference to the drawings are illustrative, which is only used
to explain the present disclosure and shouldn't be construed to
limit the present disclosure.
[0050] Various embodiments and examples are provided in the
following description to implement different structures of the
present disclosure. In order to simplify the present disclosure,
certain elements and settings will be described. However, these
elements and settings are only by way of example and are not
intended to limit the present disclosure. In addition, reference
numerals may be repeated in different examples in the present
disclosure. This repeating is for the purpose of simplification and
clarity and does not refer to relations between different
embodiments and/or settings. Furthermore, examples of different
processes and materials are provided in the present disclosure.
However, it would be appreciated by those skilled in the art that
other processes and/or materials may be also applied.
[0051] A crankshaft 300 for a rotary compressor 1000 according to
embodiments of a first aspect of the present disclosure is
described in the following with reference to FIG. 1 to FIG. 17.
[0052] Specifically, the rotary compressor 1000 may further include
a casing 100 and a compressing mechanism 200, and as shown in FIG.
1 and FIG. 2, the compressing mechanism 200 may include a main
bearing 201, a cylinder 202, an auxiliary bearing 203, a sliding
vane 204 and a piston 205. The main bearing 201 and the auxiliary
bearing 203 are disposed onto two axial ends of the cylinder 202
respectively so as to define a working chamber together with the
cylinder 202, and the crankshaft 300 goes through the main bearing
201, the cylinder 202 and the auxiliary bearing 203.
[0053] The crankshaft 300 for the rotary compressor 1000 according
to embodiments of the first aspect of the present disclosure
includes a body 1 and an eccentric portion 2. Specifically, with
reference to FIG. 7, the eccentric portion 2 is fitted over the
body 1. The body 1 is substantially formed in a long cylinder shape
and goes through the eccentric portion 2. Here, it should be noted
that, the expression "fitted over" is used to indicate a positional
relationship of the eccentric portion 2 and the body 1 instead of
limiting the assembling relationship between the eccentric portion
2 and the body 1. For example, the eccentric portion 2 and the body
1 may be parts processed separately and fixed together through a
subsequent assembly, or the eccentric portion 2 and the body 1 may
also be an integrally processed part.
[0054] With reference to FIG. 2, FIG. 3 and FIG. 6, the piston 205
is fitted over the eccentric portion 2, and the eccentric portion 2
is fitted in the working chamber. A sliding vane groove going
through the cylinder 202 radially and communicating with the
working chamber is formed in the cylinder 202. The sliding vane 204
is slidably disposed in the sliding vane groove, and a front end of
the sliding vane 204 abuts against an outer circumferential surface
of the piston 205 all the time. Thus, in the rotation process of
the crankshaft 300, the eccentric portion 2 is able to drive the
piston 205 to roll along an inner circumferential surface of the
cylinder 202 and meanwhile push the sliding vane 204 to slide
inwards and outwards along a radial direction of the cylinder 202
so as to compress a refrigerant in the working chamber.
[0055] Specifically, as shown in FIG. 7 to FIG. 17, the eccentric
portion 2 is provided with at least one of a flexible structure 21
and an oil pressure surface 22, that is, the eccentric portion 2
may be only provided with the flexible structure 21, or the
eccentric portion 2 is only provided with the oil pressure surface
22, or the eccentric portion 2 may also be provided with both of
the flexible structure 21 and the oil pressure surface 22.
[0056] The flexible structure 21 is configured to deform inwards
(facing towards a central axis direction of the body 1) when
subject to an external force in an inward direction. For example,
in the example shown in FIG. 4, when the cylinder 202 is processed,
a contour of the inner circumferential surface thereof is a curve
indicated by an arrow line a1, and after the cylinder 202 is
assembled and deformed, the contour of the inner circumferential
surface thereof is a curve indicated by an arrow line a2. The
original outer contour of the flexible structure 21 is a curve
indicated by an arrow line b1, and the contour of the flexible
structure 21 changes into a curve indicated by an arrow line b2
when the deformed inner circumferential surface of the cylinder 202
applies an abnormal contact force F to the piston 205 and the
flexible structure 21 deforms inwards (facing towards a central
axis of the piston 205). Thus, the flexible structure 21 is able to
absorb, through deformation, the contact force caused by the
abnormal contact of the piston 205 and the cylinder 202.
[0057] Therefore, when the eccentric portion 2 is provided with the
flexible structure 21 having the structural features mentioned
above, if abnormal conditions occur, such as introduction of
impurities into the compressing mechanism 200, bulges formation due
to the deformation of the inner circumferential surface of the
cylinder 202, or the size of the parts processed out of tolerance,
the flexible structure 21 is able to deform inwards so as to absorb
the contact force generated by the metallic contact between the
piston 205 and the inner circumferential surface of the cylinder
202, that is, the contact force, caused by a too small gap and the
abnormal contact between the piston 205 and the cylinder 202, can
be absorbed by the deformation of the flexible structure 21, which
ensures a normal operation of the rotary compressor 1000 and
prevents the problem of being stuck during the operation.
[0058] As shown in FIG. 5, the oil pressure surface 22 is
configured in such a way that in a direction (for example a
direction indicated by an arrow line R2 in FIG. 5) opposite to a
rotating direction of a rotating central axis of the crankshaft
300, a distance L1 between a front end 221 of the oil pressure
surface 22 and the central axis of the eccentric portion 2 is
smaller than a distance L2 between a tail end 222 of the oil
pressure surface 22 and the central axis of the eccentric portion
2. In the rotating direction of the crankshaft 300, the front end
221 of the oil pressure surface 22 is always located in front of
the tail end 222 of the oil pressure surface 22.
[0059] When the eccentric portion 2 is provided with the oil
pressure surface 22 having the structural features mentioned above,
as an oil cavity 3 defined by the oil pressure surface 22 and the
piston 205 converges gradually along the direction (for example the
direction indicated by the arrow line R2 in FIG. 5) opposite to the
rotating direction (for example a direction indicated by an arrow
line R1 in FIG. 5) of the crankshaft 300, the lubricating oil in
the oil cavity 3 can be gathered within a wedge shaped space 3a by
means of a centrifugal force imposed on the lubricating oil in the
oil cavity 3 due to high-speed rotation of the crankshaft 300, so
that an inlet oil pressure (for example a direction indicated by an
arrow p in FIG. 5) of the sliding bearing is increased, and hence
the oil supply state of the eccentric portion 2 is improved, that
is, the lubrication condition of the piston 205 and the eccentric
portion 2 is improved.
[0060] In addition, as the eccentric portion 2 is provided with at
least one of the flexible structure 21 and the oil pressure surface
22, an outer circumferential surface of the eccentric portion 2 may
be formed in a non-circular shape, for example the case shown in
FIG. 7 and FIG. 9, i.e. the flexible structure 21 has a first end
211 and a second end 212, the first end 211 of the flexible
structure 21 is connected to a first side wall of the eccentric
portion 2, and the second end 212 of the flexible structure 21 is
spaced apart from the first side wall of the eccentric portion 2.
Accordingly, with reference to FIG. 5, the outer circumferential
surface of the eccentric portion 2 is not able to contact the inner
circumferential surface of the piston 205 fully and completely,
which can reduce the contact area between the eccentric portion 2
and the inner circumferential surface of the piston 205, thereby
reducing friction power consumption of the contact area and
improving energy efficiency of the rotary compressor 1000. It is
tested that when a motor operating frequency of the rotary
compressor 1000 is 60 Hz, the input power can be reduced by 2%.
[0061] For the rotary compressor 1000 in which carbon dioxide
serves as a refrigerant, when a test is performed under the Chinese
national standard performance condition, the refrigerating capacity
of the rotary compressor 1000 mounted with the crankshaft 300 in
the prior art (i.e. the eccentric portion 2 is formed in a complete
cylindrical shape) is 6297 W, the corresponding input power of the
electric motor is 1623 W, and the coefficient of performance (COP)
is 3.88, but the refrigerating capacity of the rotary compressor
1000 mounted with the crankshaft 300 according to embodiments of
the present disclosure (for example the eccentric portion 2 has the
flexible structure 21 and the oil pressure surface 22) is 6523 W,
the corresponding input power of the electric motor is 1598 W, and
the coefficient of performance (COP) is 4.08. Thus, by contrast,
the refrigerating capacity of the rotary compressor 1000 mounted
with the crankshaft 300 according to embodiments of the present
disclosure is improved by 1.62%, the input power of the electric
motor is reduced by 1.57%, and the coefficient of performance (COP)
is improved by 5.21%.
[0062] With the crankshaft 300 for the rotary compressor 1000
according to embodiments of the present disclosure, when the
eccentric portion 2 is provided with the flexible structure 21
having the above structural features, it is possible to effectively
solve the problem that the rotary compressor 1000 gets stuck by the
abnormal contact between the piston 205 and the cylinder 202 due to
a small gap between an air suction side and an air discharge side
of the compressing mechanism 200 or existence of impurities in the
volume cavity of the compressing mechanism 200. When the eccentric
portion 2 is provided with the oil pressure surface 22 having the
above structural features, the oil cavity 3 between the piston 205
and the eccentric portion 2 has an gradually decreasing volume
along the direction opposite to the rotating direction of the
crankshaft 300, such that a high-pressure oil wedge space can be
formed at a tail portion of the oil cavity 3 by utilizing the
rotating centrifugal force from the high-speed rotation of the
crankshaft 300 effectively, thereby increasing the inlet oil
pressure, and improving the environment of lubrication between the
eccentric portion 2 and the piston 205.
[0063] The crankshaft 300 for the rotary compressor 1000 according
to a plurality of embodiments of the present disclosure is
described in the following with reference to FIG. 1 to FIG. 17.
First Embodiment
[0064] With reference to FIG. 7 to FIG. 10, the eccentric portion 2
is provided with the flexible structure 21, and the flexible
structure 21 has the first end 211 and the second end 212. The
first end 211 of the flexible structure 21 is connected to the
first side wall of the eccentric portion 2 while the second end 212
of the flexible structure 2 is spaced apart from the first side
wall of the eccentric portion 2. Specifically, the first end 211 of
the flexible structure 21 is connected with the first side wall of
the eccentric portion 2, and the second end 212 of the flexible
structure 21 extends towards a direction away from the first side
wall of the eccentric portion 2. Accordingly, when the piston 205
are in abnormal contact with the inner wall of the cylinder 202,
the abnormal contact force can be absorbed through an elastic
deformation of the second end 212 of the flexible structure 21, and
hence the problem that the rotary compressor 1000 gets stuck is
improved, and on the other hand, the flexible structure 21 in this
kind of structure makes the whole outer circumferential surface of
the eccentric portion 2 form a non-circular shape, so that the
contact area between the piston 205 and the eccentric portion 2 can
be reduced effectively, hence reducing the contact fiction power
effectively, and in addition, the structure of the flexible
structure 21 is simple and convenient to process.
[0065] Further, with reference to FIG. 8 to FIG. 10, the flexible
structure 21 and the central axis of the eccentric portion 2 are
located at a same side of a central axis of the body 1. That is,
the flexible structure 21 is disposed at a side of the eccentric
portion 2 farther away from the body 1, or in other word, the
flexible structure 21 is located at a side, away from the central
axis of the body 1, of a connecting line between the central axis
of the eccentric portion 2 and the central axis of the body 1.
Thus, by disposing the flexible structure 21 at the side of the
eccentric portion 2 farther away from the body 1, not only the
processing becomes convenient, but also the flexible structure 21
has a larger elastic deformation and has a stronger capacity to
absorb the abnormal contact force.
[0066] With reference to FIG. 9 and FIG. 10, the first end 211 and
the second end 212 of the flexible structure 21 are located at two
sides of a reference plane (for example the plane A-A shown in FIG.
9) respectively, in which case a distance between the first end 211
of the flexible structure 21 and the reference plane is larger than
0, and a distance d1 between the second end 212 of the flexible
structure 21 and the reference plane is also larger than 0, in
which the reference plane is a plane defined by the central axis of
the eccentric portion 2 and the central axis of the body 1. Thus,
the flexible structure 21 has a relatively large length, and the
elastic deformation takes places more effectively, which makes the
flexible structure 21 has a stronger capacity to absorb the
abnormal contact force. Certainly, the present disclosure is not
limited to this; the distance d1 between the second end 212 of the
flexible structure 21 and the reference plane may also be equal to
0, that is, the second end 212 of the flexible structure 21 may be
flush with the reference plane.
[0067] With reference to FIG. 9, a distance d2 between the farthest
point from the central axis of the eccentric portion 2, among
intersection points of the flexible structure 21 and the reference
plane, and the central axis of the eccentric portion 2 satisfies:
d2.gtoreq.R0, wherein R0 is an outer radius of the eccentric
portion 2. Thus, the flexible structure 21 is away from the central
axis of the eccentric portion 2 far enough, which enables more
effective elastic deformation so as to absorb the abnormal contact
force better.
[0068] Further, with reference to FIG. 7 and FIG. 9, the oil
pressure surface 22 is formed on a second side wall, opposite to
the second end 212 of the flexible structure 21, of the eccentric
portion 2. Thus, the second end 212 of the flexible structure 21 is
spaced apart from the first side wall of the eccentric portion 2,
so the second end 212 of the flexible structure 21 is spaced apart
from the oil pressure surface 22 in a direction from the inside to
the outside, and hence an oil storage space is defined between the
flexible structure 21 and the oil pressure surface 22. Thus, the
structure of the eccentric portion 2 is simple, compact and
convenient to process, which can realize three kinds of effects,
namely absorbing abnormal contact force, improving lubrication
effect and decreasing contact abrasion between the eccentric
portion and the piston 205 reliably. Preferably, the oil pressure
surface 22 may be formed to be a smooth curved surface so as to be
convenient to process and manufacture as well as have a low
processing cost.
[0069] With reference to FIG. 10 combined with FIG. 5, the
eccentric portion 2 is provided with the oil pressure surface 22,
and a communicating oil hole 23 communicated with a central oil
hole of the body 1 is formed in the oil pressure surface 22, such
that the lubricating oil in the central oil hole of the body 1 can
be supplied into the oil cavity 3 through the communicating oil
hole 23, and then flow into the wedge shaped space 3a at the tail
end 222 of the oil pressure surface 22 under the action of the
rotating centrifugal force of the crankshaft 300. Thus, by
providing the communicating oil hole 23, it is convenient to supply
the lubricating oil between the piston 205 and the eccentric
portion 2. Certainly, the present disclosure is not limited to
this, and the lubricating oil may be supplied between the piston
205 and the eccentric portion 2 in other ways for example through
an oil supply pipe.
[0070] Specifically, as shown in FIG. 7, two ends 22c of the oil
pressure surface 22 in an axial direction of the eccentric portion
2 adjoin respective corresponding end faces 2a of the eccentric
portion 2 directly, which is an extreme possibility in terms of the
fact that the two ends 22c of the oil pressure surface 22 in the
axial direction of the eccentric portion 2 are adjacent to the
respective corresponding end faces 2a of the eccentric portion 2.
That is, a width of the oil pressure surface 22 in an axial
direction of the body 1 is equal to a thickness of the eccentric
portion 2 in the axial direction of the body 1, and the two ends
22c of the oil pressure surface 22 in the axial direction are flush
with the two corresponding end faces 2a of the eccentric portion 2
in the axial direction. As a result, not only the processing is
facilitated, but also the oil pressure surface 22 has a
sufficiently large area, which makes the lubricating oil flow to
the oil pressure surface 22 more adequately, and hence achieve a
better lubrication effect.
Second Embodiment
[0071] As shown in FIG. 11 and FIG. 12, the structure in the
present embodiment is substantially identical to that in the first
embodiment, the same components being denoted by like reference
numerals, which only differs in that the eccentric portion 2 in the
present embodiment is not provided with the flexible structure
21.
Third Embodiment
[0072] As shown in FIG. 13 and FIG. 14, the eccentric portion 2 is
provided with the flexible structure 21, and the flexible structure
21 has the first end 211 and the second end 212. Both the first end
211 and the second end 212 of the flexible structure 21 are
connected to a side wall of the eccentric portion 2 and other
portions of the flexible structure 21 except the first end and 211
the second end 212 are spaced apart from the side wall of the
eccentric portion 2. In this way, a substantially crescent hollow
cavity is defined between the flexible structure 21 and the side
wall of the eccentric portion 2, and the hollow cavity is able to
go through the eccentric portion 2 along the axial direction of the
body 1. Thus, when the piston 205 are in abnormal contact with the
inner wall of the cylinder 202, the portions of the flexible
structure 21, except the first end 211 and the second end 212,
deform elastically to absorb the contact force. As a result, the
structure of the flexible structure 21 is simple and convenient to
process, and the flexible structure 21 and the side wall of the
eccentric portion 2 have high connection reliability and long
service life.
Fourth Embodiment
[0073] As shown in FIG. 15, the structure in the present embodiment
is substantially identical to that in the third embodiment, the
same components being denoted by like reference numerals, which
only differs in that the eccentric portion 2 in the present
embodiment is provided with the oil pressure surface 22.
Specifically, the eccentric portion 2 is provided with the oil
pressure surface 22, the two ends 22c of the oil pressure surface
22 in the axial direction of the eccentric portion 2 are adjacent
to the two end faces 2a of the eccentric portion 2 respectively,
and the two ends 22c of the oil pressure surface 22 in the axial
direction of the eccentric portion 2 are spaced apart from the two
end faces 2a of the eccentric portion 2. That is, the two ends 22c
of the oil pressure surface 22 in the axial direction of the
eccentric portion 2 do not adjoin the two end faces 2a of the
eccentric portion 2 directly, such that it is convenient to process
and a better lubrication effect can be achieved.
Fifth Embodiment
[0074] As shown in FIG. 16 and FIG. 17, the structure in the
present embodiment is substantially identical to that in the
embodiment four, the same components being denoted by like
reference numerals, which only differs in two aspects. In the first
aspect, a shape of the flexible structure 21 in the present
embodiment is different from a shape of the flexible structure 21
in the fourth embodiment. Specifically, the first end 211 and the
second end 212 of the flexible structure 21 in the fourth
embodiment are both connected to the side wall of the eccentric
portion 2 (as shown in FIG. 15), but in the present embodiment,
only the first end 211 of the flexible structure 21 is connected to
the side wall of the eccentric portion 2, and the second end 212 of
the flexible structure 21 is spaced apart from the side wall of the
eccentric portion 2. In the second aspect, a shape of the oil
pressure surface 22 in the present embodiment is different from a
shape of the oil pressure surface 22 in the fourth embodiment.
Specifically, the oil pressure surface 22 is formed to be a curved
surface in the fourth embodiment (as shown in FIG. 15), but in the
present embodiment, the oil pressure surface 22 includes two
segment connected in a circumferential direction. A first segment
22a is formed to be a combination of a curved surface and a flat
surface, and two ends 22c of the first segment 22a in the axial
direction of the eccentric portion 2 adjoin the two end faces 2a of
the eccentric portion 2 respectively. A second segment 22b is
formed to be a curved surface, and two ends 22c of the second
segment 22b in the axial direction of the eccentric portion 2 are
adjacent to but do not adjoin the two end faces 2a of the eccentric
portion 2 respectively. Thus, the oil pressure surface 22 is also
convenient to process and manufacture, and the lubricating effect
between the piston 205 and the eccentric portion 2 is improved.
Certainly, the structure of the oil pressure surface 22 may also be
designed according to the actual requirement so as to meet the
actual requirement better.
[0075] With reference to FIG. 1, the rotary compressor 1000
according to embodiments of a second aspect of the present
disclosure includes a casing 100, a compressing mechanism 200 and
the crankshaft 300 for the rotary compressor 1000 according to
embodiments of the first aspect of the present disclosure mentioned
above. The compressing mechanism 200 is disposed in the casing 100
and has a working chamber, and an end of the crankshaft 300 goes
through the compressing mechanism 200. Here, it should be noted
that, as the structure of the rotary compressor 1000 has been
described in detail above, it will not be repeated here. Other
configurations (such as an electric motor) and operations of the
rotary compressor 1000 according to embodiments of the present
disclosure are well known to those ordinarily skilled in the art,
which will not be described in detail herein.
[0076] For the rotary compressor 1000 according to embodiments of
the present disclosure, by providing the crankshaft 300 for the
rotary compressor 1000 according to embodiments of the above first
aspect, the refrigerating capacity of the rotary compressor 1000 is
improved, the input power of the electric motor of the rotary
compressor 1000 is reduced, and the coefficient of performance of
the rotary compressor 1000 is improved.
[0077] A refrigerating cycle device (not shown in the figures)
according to embodiments of a third aspect of the present
disclosure includes the rotary compressor 1000 according to
embodiments of the second aspect of the present disclosure.
Specifically, the refrigerating cycle device may further include a
condenser (not shown in the figures), an expansion mechanism (not
shown in the figures), an evaporator (not shown in the figures) and
etc., in which both the rotary compressor 1000 and the expansion
mechanism are connected with the condenser, and the evaporator is
connected with the expansion mechanism. Other configurations and
operations of the refrigerating cycle device according to
embodiments of the present disclosure are well known to those
ordinarily skilled in the art, which will not be described in
detail herein.
[0078] For the refrigerating cycle device according to embodiments
of the present disclosure, by providing the rotary compressor 1000
according to embodiments of the second aspect mentioned above, the
overall performance of the refrigerating cycle device is
improved.
[0079] In the specification, it should be understood that terms
such as "center", "longitudinal ", "lateral", "length", "width",
"depth", "up", "down", "front", "rear", "left", "right",
"vertical", "horizontal", "top", "bottom", "inner", "outer",
"clockwise", "counterclockwise", "axial direction", "radial
direction", "circumferential direction" should be construed to
refer to the orientation as then described or as shown in the
drawings under discussion. These relative terms are for convenience
of description and do not require that the present disclosure be
constructed or operated in a particular orientation, so shall not
be construed to limit the present disclosure.
[0080] In addition, terms such as "first" and "second" are used
herein for purposes of description and are not intended to indicate
or imply relative importance or significance or to imply the number
of indicated technical features. Thus, the feature defined with
"first" and "second" may comprise one or more of this feature. In
the description of the present disclosure, "a plurality of" means
two or more than two, unless specified otherwise.
[0081] In the present disclosure, unless specified or limited
otherwise, the terms "mounted," "connected," "coupled," "fixed"
should be understood broadly, and may be, for example, fixed
connections, detachable connections, or integral connections; may
also be direct connections or indirect connections via intervening
structures; may also be inner communications or interaction
relationships of two elements, which can be understood by those
skilled in the art according to specific situations.
[0082] In the present disclosure, unless specified or limited
otherwise, a structure in which a first feature is "on" or "below"
a second feature may include an embodiment in which the first
feature is in direct contact with the second feature, and may also
include an embodiment in which the first feature and the second
feature are not in direct contact with each other, but are
contacted via an additional feature formed therebetween.
Furthermore, a first feature "on," "above," or "on top of" a second
feature may include an embodiment in which the first feature is
right or obliquely "on," "above," or "on top of" the second
feature, or just means that the first feature is at a height higher
than that of the second feature; while a first feature "below,"
"under," or "on bottom of" a second feature may include an
embodiment in which the first feature is right or obliquely
"below," "under," or "on bottom of" the second feature, or just
means that the first feature is at a height lower than that of the
second feature.
[0083] Reference throughout this specification to "an embodiment,"
"some embodiments," "an example," "a specific example," or "some
examples," means that a particular feature, structure, material, or
characteristic described in connection with the embodiment or
example is included in at least one embodiment or example of the
present disclosure. In the present specification, the illustrative
statement of the terms above is not necessarily referring to the
same embodiment or example. Furthermore, the particular features,
structures, materials, or characteristics may be combined in any
suitable manner in one or more embodiments or examples. In
addition, the different embodiments or examples as well as the
features in the different embodiments or examples described in the
specification can be combined or united by those skilled in the
related art in the absence of contradictory circumstances.
[0084] Although embodiments of the present disclosure have been
shown and described, it would be appreciated by those skilled in
the art that changes, alternatives, variation and modifications can
be made in the embodiments without departing from spirit and
principles of the present disclosure, and the scope of the present
disclosure is limited by the claims and its equivalents.
* * * * *