U.S. patent application number 16/969952 was filed with the patent office on 2020-12-31 for screw compressor and air conditioning unit.
The applicant listed for this patent is Gree Electric Appliances, Inc. of Zhuhai. Invention is credited to Yushi Bi, Cong Cao, Furong Hou, Ziyuan Huang, Rihua Li, Hua Liu, Zhihua Liu, Qiangjun Meng, Yungong Xu, Baoge Zhang, Helong Zhang, Tianyi Zhang, Zhiping Zhang.
Application Number | 20200408210 16/969952 |
Document ID | / |
Family ID | 1000005088970 |
Filed Date | 2020-12-31 |
United States Patent
Application |
20200408210 |
Kind Code |
A1 |
Liu; Hua ; et al. |
December 31, 2020 |
Screw Compressor and Air Conditioning Unit
Abstract
The present disclosure discloses a screw compressor and an
air-conditioning unit, and relates to the field of compressors. The
screw compressor has a first pressure level rotor assembly, a
second pressure level rotor assembly and a body. The first pressure
level rotor assembly has a first pressure level male rotor and a
first pressure level female rotor; the second pressure level rotor
assembly has a second pressure level male rotor and a second
pressure level female rotor. Wherein, the first pressure level
rotor assembly and the second pressure level rotor assembly are
configured to enable an axial force received by the first pressure
level rotor assembly and exerted by a compressed gas opposite to an
axial force received by the second pressure level rotor assembly
and exerted by a compressed gas. The force received during the
operational process of the screw compressor is more balanced.
Inventors: |
Liu; Hua; (Zhuhai,
Guangdong, CN) ; Zhang; Zhiping; (Zhuhai, Guangdong,
CN) ; Zhang; Tianyi; (Zhuhai, Guangdong, CN) ;
Bi; Yushi; (Zhuhai, Guangdong, CN) ; Cao; Cong;
(Zhuhai, Guangdong, CN) ; Li; Rihua; (Zhuhai,
Guangdong, CN) ; Meng; Qiangjun; (Zhuhai, Guangdong,
CN) ; Huang; Ziyuan; (Zhuhai, Guangdong, CN) ;
Zhang; Helong; (Zhuhai, Guangdong, CN) ; Xu;
Yungong; (Zhuhai, Guangdong, CN) ; Zhang; Baoge;
(Zhuhai, Guangdong, CN) ; Liu; Zhihua; (Zhuhai,
Guangdong, CN) ; Hou; Furong; (Zhuhai, Guangdong,
CN) |
|
Applicant: |
Name |
City |
State |
Country |
Type |
Gree Electric Appliances, Inc. of Zhuhai |
Zhuhai, Guangdong |
|
CN |
|
|
Family ID: |
1000005088970 |
Appl. No.: |
16/969952 |
Filed: |
December 12, 2018 |
PCT Filed: |
December 12, 2018 |
PCT NO: |
PCT/CN2018/120570 |
371 Date: |
August 13, 2020 |
Current U.S.
Class: |
1/1 |
Current CPC
Class: |
F04C 2240/40 20130101;
F04C 2240/30 20130101; F04C 2240/50 20130101; F04C 18/16 20130101;
F04C 29/0021 20130101; F04C 2250/20 20130101 |
International
Class: |
F04C 18/16 20060101
F04C018/16; F04C 29/00 20060101 F04C029/00 |
Foreign Application Data
Date |
Code |
Application Number |
Mar 5, 2018 |
CN |
201810179519.9 |
Claims
1. A screw compressor, comprising: a first pressure level rotor
assembly comprising a first pressure level male rotor and a first
pressure level female rotor that mesh with each other; a second
pressure level rotor assembly comprising a second pressure level
male rotor and a second pressure level female rotor that mesh with
each other; and a body in which the first pressure level rotor
assembly and the second pressure level rotor assembly are arranged;
wherein the first pressure level rotor assembly and the second
pressure level rotor assembly are configured to enable an axial
force received by the first pressure level rotor assembly and
exerted by a compressed gas in the first pressure level rotor
assembly opposite to an axial force received by the second pressure
level rotor assembly and exerted by a compressed gas therein.
2. The screw compressor according to claim 1, wherein the first
pressure level male rotor and the second pressure level male rotor
are coaxially arranged.
3. The screw compressor according to claim 1, further comprising: a
motor disposed between the first pressure level rotor assembly and
the second pressure level rotor assembly, wherein the motor
comprises a motor shaft with a first end in driving connection with
the first pressure level male rotor, and a second end of the motor
shaft in driving connection with the second pressure level male
rotor.
4. The screw compressor according to claim 3, wherein a helix of
the first pressure level male rotor has the same helical direction
as a helix of the second pressure level male rotor, and the first
pressure level female rotor and the second pressure level female
rotor are respectively located on both sides of a shaft center line
of the motor shaft.
5. The screw compressor according to claim 1, wherein the body
comprises: a first pressure level body in which the first pressure
level rotor assembly is provided; and a second pressure level body
in which the second pressure level rotor assembly is provided,
wherein a second pressure level bearing seat supports the second
pressure level rotor assembly, and the second pressure level
bearing seat is integrally formed with the second pressure level
body.
6. The screw compressor according to claim 1, wherein the body is
provided with a fluid inlet which is located at a top of the
body.
7. The screw compressor according to claim 1, wherein the body is
provided with a fluid outlet which is located at a top of the
body.
8. The screw compressor according to claim 3, wherein a helix of
the first pressure level male rotor has a helical direction
opposite to a helix of the second pressure level male rotor, and
the first pressure level female rotor and the second pressure level
female rotor are both located on a same side of a shaft center line
of the motor shaft.
9. The screw compressor according to claim 1, wherein the screw
compressor comprises a plurality of groups of the first pressure
level rotor assembly and the second pressure level rotor
assembly.
10. The screw compressor according to claim 1, wherein the screw
compressor is a single-motor double-level screw compressor.
11. The screw compressor according to claim 3, wherein a first end
of the motor shaft is key-connected to the first pressure level
male rotor, and a second end of the motor shaft is connected to the
second pressure level male rotor through a coupling.
12. An air-conditioning unit comprising the screw compressor
according to claim 1.
Description
CROSS-REFERENCE TO RELATED APPLICATIONS
[0001] This application is the United States national phase of
International Application No. PCT/CN2018/120570 filed Dec. 12,
2018, and claims priority to Chinese Patent Application No.
201810179519.9 filed Mar. 5, 2018, the disclosures of which are
hereby incorporated by reference in their entirety.
BACKGROUND OF THE INVENTION
Field of the Invention
[0002] The present disclosure relates to the field of compressors,
and specifically relates to a screw compressor and an
air-conditioning unit.
Description of Related Art
[0003] The single-motor double-level screw compressor comprises a
motor and two pairs of rotors. The two pairs of rotors are
low-level rotors and high-level rotors. Each level of rotors
comprises a female rotor and a male rotor that mesh with each
other. The motor is located between two pairs of rotors. The motor
comprises a rotary shaft with one end connected with a high-level
male rotor by key joint to realize transmission, and the other end
connected with a low-level male rotor by key joint to realize
transmission. When the single-motor double-level screw compressor
works, two pairs of rotors work simultaneously.
[0004] The inventors have found that the related art is at least
with the following problems: the suction and displacement
directions of the screw compressor are related to the arrangement
manner of the rotor and the rotation direction of the rotor helix
(simply referred to as the rotation direction). The lower-level
rotor of the single-level double-level screw compressor is provided
with an underslung slide valve. The arrangement manner of the
lower-level rotor is as follows: viewed from the suction side to
the displacement side, the female rotor is on the left side of the
male rotor, and the refrigerant enters from above and exits from
below. The high-level rotor uses the same arrangement manner, and
the refrigerant also enters from above and exits from below, so
that the fluid outlet of the screw compressor is arranged below,
which is inconvenient to the installation of the stop valve and the
check valve. On the other hand, for the arrangement manner of the
motor between the two pairs of rotors, when the rotor rotation
direction is the same, the axial force direction is the same, and
there is an excessive force received on the displacement side,
which affects the operation stability of the compressor.
SUMMARY OF THE INVENTION
[0005] The present disclosure proposes a screw compressor and an
air conditioning unit to improve the performance of the screw
compressor.
[0006] The present disclosure provides a screw compressor,
comprising: a first pressure level rotor assembly comprising a
first pressure level male rotor and a first pressure level female
rotor that mesh with each other; a second pressure level rotor
assembly comprising a second pressure level male rotor and a second
pressure level female rotor that mesh with each other; and a body
in which the first pressure level rotor assembly and the second
pressure level rotor assembly are arranged; wherein the first
pressure level rotor assembly and the second pressure level rotor
assembly are configured to enable an axial force received by the
first pressure level rotor assembly and exerted by a compressed gas
in the first pressure level rotor assembly opposite to an axial
force received by the second pressure level rotor assembly and
exerted by a compressed gas therein.
[0007] In some embodiments, the first pressure level male rotor and
the second pressure level male rotor are coaxially arranged.
[0008] In some embodiments, the screw compressor further comprises:
a motor disposed between the first pressure level rotor assembly
and the second pressure level rotor assembly, wherein the motor
comprises a motor shaft with a first end of in driving connection
with the first pressure level male rotor, and a second end of the
motor shaft in driving connection with the second pressure level
male rotor.
[0009] In some embodiments, a helix of the first pressure level
male rotor has the same helical direction as a helix of the second
pressure level male rotor, and the first pressure level female
rotor and the second pressure level female rotor are respectively
located on both sides of a shaft center line of the motor
shaft.
[0010] In some embodiments, the body comprises: a first pressure
level body in which the first pressure level rotor assembly is
provided; and a second pressure level body internally provided with
a second pressure level bearing seat, wherein the second pressure
level bearing seat supports the second pressure level rotor
assembly, and the second pressure level bearing seat is integrally
formed with the second pressure level body.
[0011] In some embodiments, the body is provided with a fluid
inlet, which is located at the top of the body.
[0012] In some embodiments, the body is provided with a fluid
outlet, which is located at the top of the body.
[0013] In some embodiments, a helix of the first pressure level
male rotor has a helical direction opposite to a helix of the
second pressure level male rotor, and the first pressure level
female rotor and the second pressure level female rotor are both
located on the same side of a shaft center line of the motor
shaft.
[0014] In some embodiments, the screw compressor comprises a
plurality of groups of the first pressure level rotor assembly and
the second pressure level rotor assembly.
[0015] In some embodiments, the screw compressor is a single-motor
double-level screw compressor.
[0016] In some embodiments, a first end of the motor shaft is
key-connected to the first pressure level male rotor, and a second
end of the motor shaft is connected to the second pressure level
male rotor through a coupling.
[0017] In other embodiments of the present disclosure, an
air-conditioning unit is provided. The air-conditioning unit
comprises the screw compressor provided by any technical solution
of the present disclosure.
[0018] In the above-described technical solution, the arrangement
manners of the respective rotors of the first pressure level rotor
assembly and the second pressure level rotor assembly are
reasonably provided, so that the axial force received by the first
pressure level rotor assembly and exerted by the compressed gas
therein is opposite to the axial force received by the second
pressure level rotor assembly and exerted by the compressed gas
therein, which balances the axial force received by the rotor
assembly of the screw compressor as a whole, so that there is a
more balanced force received during the operational process of the
screw compressor, and the screw compressor works more reliably.
BRIEF DESCRIPTION OF THE DRAWINGS
[0019] FIG. 1 is a schematic cross-sectional view of the structure
of a screw compressor provided by some embodiments of the present
disclosure;
[0020] FIG. 2 is a schematic view of a gas flow direction of a
screw compressor provided by some embodiments of the present
disclosure.
DESCRIPTION OF THE INVENTION
[0021] The technical solution provided by the present disclosure
will be described in more detail below in conjunction with FIGS. 1
to 2.
[0022] Referring to FIG. 1, the present disclosure provides a screw
compressor comprising a first pressure level rotor assembly 1, a
second pressure level rotor assembly 2 and a body 3. The first
pressure level rotor assembly 1 comprises a first pressure level
male rotor 11 and a first pressure level female rotor 12 meshed
with each other, and the second pressure level rotor assembly 2
comprises a second pressure level male rotor 21 and a second
pressure level female rotor 22 mated with each other; the body 3 is
internally provided with a first pressure level rotor assembly 1
and a second pressure level rotor assembly 2. Among them, the first
pressure level rotor assembly 1 and the second pressure level rotor
assembly 2 are provided to satisfy the following conditions: the
axial force received by the first pressure level rotor assembly 1
and exerted by the compressed gas therein is opposite to the axial
force received by the second pressure level rotor assembly 2 and
exerted by the compressed gas therein.
[0023] The first pressure level male rotor 11 is supported by a
bearing 51, the first pressure level female rotor 12 is supported
by a bearing 52, the second pressure level male rotor 21 is
supported by a bearing 53, and the second pressure level female
rotor 22 is supported by a bearing 54.
[0024] When the gas is compressed in the rotor assembly, the gas
pressure on the suction side is lower than the gas pressure on the
displacement side. Therefore, the action force exerted by the
displacement side on the inner wall of the engagement cavity of the
female and male rotors is greater than the action force exerted by
the suction side on the inner wall of the engagement cavity of the
female and male rotors. Since the inner wall of the tooth space of
the male and female rotors is helical, the action force exerted by
the gas on the inner wall of the engagement cavity has a component
along the shaft center line of the male and female rotors. The
force of the component refers to an axial force exerted by the gas
to the rotor, and an opposite axial force refers to an opposite
direction of an axial force.
[0025] Taking a substantially arrow-like structure formed by a
helix contact when the female rotor meshes with the male rotor as
an example, the alternative arrangement manner of the first level
rotor assembly 1 and the second pressure level rotor assembly 2
comprises the following: one manner shown in FIG. 1 is such that
the arrow-like shapes formed by approximately intersecting the
helixes of the first level rotor assembly 1 and the second pressure
level rotor assembly 2 are opposite to each other; another
alternative manner is such that the arrow-like shapes formed by
approximately intersecting the helixes of the first level rotor
assembly 1 and the second pressure level rotor assembly 2 face away
from each other.
[0026] The screw compressor comprises, for example, one or more
groups of rotor assemblies. Each group of rotor assemblies
comprises a first pressure level rotor assembly 1 and a second
pressure level rotor assembly 2. The first pressure level rotor
assembly 1 and the second pressure level rotor assembly 2 in each
group of rotor assemblies receive the compressed gas in opposite
axial directions so as to cancel out with each other. The same
stream of gas sequentially passes through respective rotor
assemblies to realize compression.
[0027] Taking a double-level screw compressor as an example, the
low pressure level rotor assembly serves as the first pressure
level rotor assembly 1, the high pressure level rotor assembly
serves as the second pressure level rotor assembly 2, and the gas
is sequentially compressed by the first pressure level rotor
assembly 1 and the second pressure level rotor assembly 2.
[0028] Taking a three-level screw compressor as an example (e.g.,
comprising three rotor assemblies A, B, and C), the gas first
enters A for compression, the gas displaced by A is then compressed
by B, and the gas displaced by B is then compressed by C.
Alternative forms comprise: for example, A serves as first pressure
level rotor assembly 1 and B serves as a second pressure level
assembly. Alternatively, B serves as a first pressure level rotor
assembly 1, and C serves as a second pressure level assembly, or A
serves as a first pressure level rotor assembly 1, and C serves as
a second pressure level assembly.
[0029] Take a four-level screw compressor as an example (e.g.,
comprising four rotor assemblies D, E, F, and G), the gas enters D
for compression, the gas displaced by D is compressed by E, and the
gas displaced by E is compressed by F, and the gas displaced by F
is compressed by G again. The four rotor assemblies are divided
into two groups, where D and E are in the first group, and F and G
are in the second group. D is the first pressure level rotor
assembly 1 in the first group, and E is the second pressure level
rotor assembly 2 in the first group. F is the first pressure level
rotor assembly 1 in the second group, and G is the second pressure
level rotor assembly 2 in the second group. The respective axial
forces of D and E are opposite to each other, and the respective
axial forces of F and G are opposite to each other.
[0030] In some embodiments, the first pressure level male rotor 11
and the second pressure level male rotor 21 are coaxially arranged
to better balance a force received by the screw compressor rotor
assembly.
[0031] The coaxial arrangement allows that the axial force received
by the first pressure level rotor assembly 1 and the axial force
received by the second pressure level rotor assembly 2 are balanced
on the concentric shaft.
[0032] Referring to FIG. 1, in some embodiments, the screw
compressor further comprises a motor 4 disposed between the first
pressure level rotor assembly 1 and the second pressure level rotor
assembly 2. The motor 4 comprises a motor shaft 41, with a first
end in driving connection with the first pressure level male rotor
11, and a second end of the motor shaft 41 in driving connection
with the second pressure level male rotor 21.
[0033] The rotation direction of the motor shaft 41, the helical
direction of the male and female rotors, and the position of the
female rotor relative to the male rotor all affect the gas flow
direction. In practical disclosures, the above-described various
factors are selected according to the gas flow direction that is
actually required.
[0034] Alternatively, the first end of the motor shaft 41 is
directly key-connected with the first pressure level male rotor 11,
and the second end of the motor shaft 41 is connected with the
second pressure level male rotor 21 through a coupling 6. The
coupling 6 is configured to balance a torque generated by the rotor
assemblies at both ends of the motor shaft 41 due to the axial
force directions that do not overlap.
[0035] The first arrangement manner of the first pressure level
rotor assembly 1 and the second pressure level rotor assembly 2
will be described below: referring to FIG. 1, in some embodiments,
the helixes of the first pressure level male rotor 11 and the
second pressure level male rotor 21 have the same helical
direction, and the first pressure level female rotor 12 and the
second pressure level female rotor 22 are located on both sides of
the shaft center line of the motor shaft 41, respectively.
[0036] Whether the first pressure level rotor assembly 1 and the
second pressure level rotor assembly 2 use the first arrangement
manner described above or the second arrangement manner described
later, alternatively, the entire screw compressor is provided: the
fluid inlet 33 of the refrigerant is located at the top of the
screw compressor, and the fluid outlet 34 of the refrigerant is
located at the bottom of the screw compressor (as shown in FIG. 2).
This arrangement manner facilitates the installation of other
related components.
[0037] Referring to FIG. 1, in some embodiments, the body 3
comprises a first pressure level body 31 and a second pressure
level body 32. The first pressure level body 31 and the second
pressure level body 32 are fixed together. The first pressure level
body 31 is internally provided with a first pressure level rotor
assembly 1; the second pressure level body 32 is internally
provided with a second pressure level bearing seat 7, and the
second pressure level bearing seat 7 supports the second pressure
level rotor assembly 2, and the second pressure level bearing seat
7 is integrally formed with the second pressure level body 32. A
bearing 53 and a bearing 54 are installed inside the second
pressure level bearing seat 7.
[0038] Referring to FIG. 1, a bearing 51 and a bearing 52 are
installed within the first pressure level bearing seat 8. The
bearing 51 supports the first pressure level male rotor 11 and the
bearing 52 supports the first pressure level female rotor 12.
[0039] Taking the above-described motor 4 disposed between the
first pressure level rotor assembly 1 and the second pressure level
rotor assembly 2 as an example, the body 3 further comprises, for
example, an intermediate body 35, and only a part or an entirety of
the housing of the motor 4 is located within the intermediate body
35, if the part comprised in the housing of the motor 4 is located
in the intermediate body 35, the motor shaft 41 projects out of the
intermediate body 35 for driving connection to each rotor assembly
on both sides of the motor 4. If the motor 4 is entirely located
within the intermediate body 35, the driving connection between the
motor shaft 41 and each rotor assembly on both sides of the motor 4
may be realized by using members such as a coupling.
[0040] In some embodiments, the body 3 is provided with a fluid
inlet 33 which is located on the top of the body 3.
[0041] Referring to FIG. 2, the fluid inlet 33 is specifically
disposed in the first pressure level body 31 for example, and
located on the top of the first pressure level body 31. Taking a
double-level screw compressor as an example, the first pressure
level is a low pressure level, and the second pressure level is a
high pressure level. The low pressure level is generally provided
with a slide valve structure which is located below the first
pressure level rotor assembly 1. Thus, at this time, the fluid
inlet 33 is disposed at the top to facilitate providing other
related structures.
[0042] Referring to FIG. 2, in some embodiments, the body 3 is
provided with a fluid outlet 34, which is located at the top of the
body 3. The thick arrow in FIG. 2 indicates the flow of compressed
gas, and the thin arrow indicates the flow of supplementary
liquid.
[0043] The fluid inlet 33 and the fluid outlet 34 of the screw
compressor are both arranged above as shown in FIG. 2, so that the
overall width dimension of the compressor is greatly reduced, and
the size of the unit shell is correspondingly reduced, thereby
effectively reducing the cost.
[0044] In some embodiments, the screw compressor is a single-motor
double-level screw compressor. That is, a motor 4 is used to
simultaneously drive the male rotors of the low pressure level and
high pressure level rotor assemblies.
[0045] Some specific embodiments will be introduced below.
[0046] The symmetrical arrangement structure of the single-motor
double-level rotor assembly in the some embodiments is shown in
FIG. 1. The first pressure level rotor assembly 1 is a low pressure
level, and the second pressure level rotor assembly 2 is a high
pressure level. The low pressure level male rotor and the low
pressure level female rotor are installed inside the low pressure
level body 3. The screw compressor uses a structure of an
underslung slide valve, and the female rotor is on the left side of
the male rotor. The high pressure level male rotor and the high
pressure level female rotor are installed within the high pressure
level body 3. With reference to the center line of the motor shaft
41, the rotor is arranged in a reversed manner, and the high
pressure level and low pressure level female rotors are in
different positions with respect to their own male rotors. The high
pressure level male rotor is driven by the motor 4 installed within
the motor body 3, and the motor shaft 41 drives the low pressure
level male rotor through the coupling. The coupling 6 is inside the
intermediate body 35, and is finally assembled.
[0047] The flow direction of the entire screw compressor enters
from above and exits from above. Specifically, the fluid direction
of the first pressure level rotor assembly 1 enters from above and
exits from below, and the fluid direction of the second pressure
level rotor assembly 2 enters from below and exits from above. A
fluid supplementing port 36 is provided on the top of the
intermediate body 35 to supplement a low temperature liquid
refrigerant. The sprayed liquid is settled to mix with the
displacement of the first pressure level, and cools the motor 4
when passing through the cavity of the motor 4. Since the high
pressure level suction port is arranged below, the refrigerant
passing through the cavity of the motor 4 flows to the bottom, and
the flow distance of the refrigerant increases, which effectively
cool the stator coil of the motor 4, so that it is possible to
effectively reduce the displacement temperature and improve the
energy efficiency.
[0048] Since the first pressure level rotor assembly 1 and the
second pressure level rotor assembly 2 are symmetrically arranged,
if the same rotation direction is used, the fluid outlets 34 are
all arranged below, and the displacement pressure is greater than
the suction pressure. The directions of the forces received by the
rotors are all from down to up, such that the upper side of the
rotor subjected to an excessive force is likely to be scratched
with the rotor cavity, and the coupling when having an excessive
offset is likely to cause too much noise. Therefore, the rotation
direction of the second pressure level rotor assembly 2 is reversed
as shown in FIG. 1. During operation, in the direction of the top
view, the low pressure level rotor inwards with respect to the two
rotors, with a downward displacement and an upward force received
by the rotor. The second pressure level rotor assembly 2 rotates
outwards with respect to the rotors. The two levels of rotors
receive forced in opposite directions and receive balanced forces.
The rotation torque is balanced by the coupling.
[0049] The above technical solutions, the oil path is provided such
that the low pressure level enters from the first pressure level
female rotor 12 side, and the first pressure level male rotor 11
returns oil at the bottom; the high pressure level enters from the
second pressure level female rotor 22 side, and the second pressure
level male rotor 21 returns oil at the bottom, such that the oil
return may be ensured by supplying oil by a pressure
difference.
[0050] The above-described technical solution implements balancing
the force received by two levels of rotors and improving the
operation stability of the compressor by symmetrically arranging
the rotors. The fluid inlet 33 and the fluid outlet 34 of the
compressor are both arranged above, which facilitate the
maintenance and reduction of the cost.
[0051] The second arrangement manner of the first pressure level
rotor assembly 1 and the second pressure level rotor assembly 2
will be introduced below.
[0052] In some embodiments, the helixes of the first pressure level
male rotor 11 and the second pressure level male rotor 21 are in
opposite helical directions. The first pressure level female rotor
12 and the second pressure level female rotor 22 are both located
on the same side of the shaft center line of the motor shaft
41.
[0053] Regardless of the above-described arrangement manners of the
first pressure level rotor assembly 1 and the second pressure level
rotor assembly 2, the entire screw compressor is provided such that
the fluid inlet 33 of the refrigerant is located at the top of the
screw compressor, and the refrigerant fluid outlet 34 is located at
the bottom of the screw compressor.
[0054] For other unmentioned matters in some embodiments, please
refer to the description of the above-described embodiments.
[0055] In another embodiment of the present disclosure, an
air-conditioning unit is provided. The air-conditioning unit
comprises the screw compressor provided by any technical solution
of the present disclosure.
[0056] In the description of the present disclosure, it is
understood that, the azimuth or positional relations indicated by
the terms "center", "transverse", "longitudinal", "front", "rear",
"left", "right", "up", "down", "vertical", "horizontal", "top",
"bottom", "within", "outside", which are based on the azimuth or
positional relations illustrated by the drawings, are only for
facilitating description of the present disclosure and simplifying
the description, rather than indicating or implying that the device
or element referred thereto has to present a particular azimuth,
and be constructed and operated in a particular azimuth, so that it
cannot be understood as limiting the protection scope of the
present disclosure.
[0057] Finally, it should be explained that: the aforementioned
embodiments are only configured to describe the technical solution
of the present disclosure rather than limiting the same; although
detailed explanations are made to the present disclosure by
referring to preferred embodiments, a common technical person in
the art should understand that: it is still possible to make
amendments to the embodiments of the present disclosure or make
equivalent replacements to part of the technical features; without
departing from the spirit and scope of the present disclosure, they
should all be covered in the scope of the technical solution for
which protection is sought in the present disclosure.
* * * * *