U.S. patent application number 17/572151 was filed with the patent office on 2022-04-28 for compressor, and refrigeration device.
The applicant listed for this patent is DAIKIN INDUSTRIES, LTD.. Invention is credited to Toshiyuki TOYAMA.
Application Number | 20220128280 17/572151 |
Document ID | / |
Family ID | |
Filed Date | 2022-04-28 |
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United States Patent
Application |
20220128280 |
Kind Code |
A1 |
TOYAMA; Toshiyuki |
April 28, 2022 |
COMPRESSOR, AND REFRIGERATION DEVICE
Abstract
A compressor includes a casing that stores lubricating oil in a
bottom of the casing, a compression mechanism housed in the casing,
a housing that supports the compression mechanism and forms a crank
chamber, a first oil return passage arranged to guide the
lubricating oil flowing into the crank chamber downward, and a
second oil return passage. The first oil return passage is provided
with an oil return guide that contracts a flow of the lubricating
oil. An upper portion of the casing forms an oil separation space
that separates the lubricating oil from a high-pressure refrigerant
discharged from the compression mechanism in the oil separation
space. The second oil return passage guides the lubricating oil
separated in the oil separation space downward, and an outlet of
the second oil return passage is disposed near an outlet of the oil
return guide.
Inventors: |
TOYAMA; Toshiyuki; (Osaka,
JP) |
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Applicant: |
Name |
City |
State |
Country |
Type |
DAIKIN INDUSTRIES, LTD. |
Osaka |
|
JP |
|
|
Appl. No.: |
17/572151 |
Filed: |
January 10, 2022 |
Related U.S. Patent Documents
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Application
Number |
Filing Date |
Patent Number |
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PCT/JP2020/021574 |
Jun 1, 2020 |
|
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17572151 |
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International
Class: |
F25B 43/02 20060101
F25B043/02; F25B 31/02 20060101 F25B031/02 |
Foreign Application Data
Date |
Code |
Application Number |
Jul 11, 2019 |
JP |
2019-129494 |
Claims
1. A compressor comprising: a casing configured to store
lubricating oil in a bottom of the casing; a compression mechanism
housed in the casing; a housing that supports the compression
mechanism and forms a crank chamber; a first oil return passage
arranged to guide the lubricating oil flowing into the crank
chamber downward, the first oil return passage being provided with
an oil return guide that contracts a flow of the lubricating oil;
and a second oil return passage, an upper portion of the casing
forming an oil separation space configured to separate the
lubricating oil from a high-pressure refrigerant discharged from
the compression mechanism therein, the second oil return passage
being configured to guide the lubricating oil separated in the oil
separation space downward, and an outlet of the second oil return
passage being disposed near an outlet of the oil return guide.
2. The compressor of claim 1, wherein the second oil return passage
includes a pipe that penetrates the housing.
3. The compressor of claim 1, further comprising: an oil return
plate disposed to surround, together with an inner wall surface of
the casing, at least a lower portion of the second oil return
passage and at least a lower portion of the oil return guide.
4. The compressor of claim 2, further comprising: an oil return
plate disposed to surround, together with an inner wall surface of
the casing, at least a lower portion of the second oil return
passage and at least a lower portion of the oil return guide.
5. The compressor of claim 3, wherein a space surrounded by the oil
return plate and the inner wall surface of the casing narrows
downward from a vicinity of the outlets of the second oil return
passage and oil return guide.
6. A refrigeration apparatus including the compressor of claim
1.
7. A refrigeration apparatus including the compressor of claim
2.
8. A refrigeration apparatus including the compressor of claim
3.
9. A refrigeration apparatus including the compressor of claim 5.
Description
CROSS-REFERENCE TO RELATED APPLICATIONS
[0001] This is a continuation of International Application No.
PCT/JP2020/021574 filed on Jun. 1, 2020, which claims priority to
Japanese Patent Application No. 2019-129494, filed on Jul. 11,
2019. The entire disclosures of these applications are incorporated
by reference herein.
BACKGROUND
Field of Invention
[0002] The present disclosure relates to a compressor and a
refrigeration apparatus.
Background Information
[0003] WO2011/093385 discloses a compressor. In this compressor,
mist-like lubricating oil, which is contained in a compressed
refrigerant gas discharged into a top space (a space in a casing
above a compression mechanism), is separated in a liquid state from
the refrigerant gas by means of a centrifugal force generated by a
swirling flow, thereby reducing oil loss.
[0004] In this compressor having a known structure, a static
pressure in the top space is lower than a static pressure of a
space above a motor (a space in the casing into which a
high-pressure refrigerant gas discharged downward from the
compression mechanism flows). Thus, a negative pressure generated
by contraction of the flow of the refrigerant gas flowing from the
compression mechanism into the space above the motor causes the
lubricating oil separated in the top space to return from the top
space to an oil reservoir at the bottom of the casing via the space
above the motor.
SUMMARY
[0005] A first aspect of the present disclosure is directed to a
compressor, including a casing configured to store lubricating oil
in a bottom of the casing, a compression mechanism housed in the
casing, a housing that supports the compression mechanism and forms
a crank chamber, a first oil return passage arranged to guide the
lubricating oil flowing into the crank chamber downward, and a
second oil return passage. The first oil return passage is provided
with an oil return guide that contracts a flow of the lubricating
oil. An upper portion of the casing forms an oil separation space
configured to separate the lubricating oil from a high-pressure
refrigerant discharged from the compression mechanism therein. The
second oil return passage is configured to guide the lubricating
oil separated in the oil separation space downward, and an outlet
of the second oil return passage is disposed near an outlet of the
oil return guide.
BRIEF DESCRIPTION OF THE DRAWINGS
[0006] FIG. 1 is a schematic view of a refrigerant circuit of a
refrigeration apparatus including a compressor according to an
embodiment.
[0007] FIG. 2 is a longitudinal sectional view of the compressor
according to the embodiment.
[0008] FIG. 3 is a detailed longitudinal sectional view of an upper
portion of the compressor shown in FIG. 2.
[0009] FIG. 4A is a perspective view illustrating an oil return
guide of the compressor shown in FIG. 2 as viewed from a drive
shaft, and FIG. 4B is a perspective view illustrating the same as
viewed from a casing.
[0010] FIG. 5A is a perspective view illustrating an oil return
plate of the compressor shown in FIG. 2 as viewed from the drive
shaft, and FIG. 5B is a perspective view illustrating the same as
viewed from the casing.
[0011] FIG. 6 is a perspective view illustrating a compression
mechanism, housing, and other adjacent components of the compressor
shown in FIG. 2 before a second oil return passage is attached.
[0012] FIG. 7 is a perspective view illustrating the compression
mechanism, housing, and other adjacent components of the compressor
shown in FIG. 2 after the second oil return passage is
attached.
[0013] FIG. 8A is a perspective view illustrating a variation of an
internal refrigerant discharge pipe of the compressor shown in FIG.
2 as viewed from the drive shaft, and FIG. 8B is a perspective view
illustrating the same as viewed from the casing.
DETAILED DESCRIPTION OF EMBODIMENT(S)
[0014] An embodiment of the present disclosure will be described
below with reference to the drawings. The embodiment below is
merely an exemplary one in nature, and is not intended to limit the
scope, applications, or use of the invention.
Configuration of Refrigeration Apparatus
[0015] FIG. 1 is a schematic view illustrating a refrigerant
circuit of a refrigeration apparatus (100) including a compressor
(1) of the present embodiment.
[0016] As illustrated in FIG. 1, the refrigeration apparatus (100)
includes the compressor (1) of the present embodiment, a condenser
(2), an expansion mechanism (3), and an evaporator (4). The
refrigeration apparatus (100) performs an operation of a
refrigeration cycle in which a refrigerant circulates in a
refrigerant circuit shown in FIG. 1. Specifically, the refrigerant
discharged from a discharge pipe (51) of the compressor (1) is
introduced into a suction pipe (52) of the compressor (1) through
the condenser (2), the expansion mechanism (3), and the evaporator
(4).
Configuration of Compressor
[0017] FIG. 2 is a longitudinal sectional view of the compressor
(1) of the present embodiment, and FIG. 3 is a detailed
longitudinal sectional view illustrating an upper portion of the
compressor (1) shown in FIG. 2. The compressor (1) is a scroll
compressor configured to compress a refrigerant when at least one
of two scroll parts meshing with each other turns.
[0018] As illustrated in FIGS. 2 and 3, the casing (10) of the
compressor (1) includes a substantially cylindrical barrel (11), a
bowl-shaped top wall portion (12) hermetically welded to an upper
end of the barrel (11), and a bowl-shaped bottom wall portion (13)
hermetically welded to a lower end of the barrel (11). The casing
(10) is made of a rigid member that is less likely to be deformed
and damaged when pressure and temperature inside and outside the
casing (10) change. The casing (10) is placed so that the axial
direction of the substantially cylindrical barrel (11) extends
along the vertical direction. The casing (10) houses, for example,
a compression mechanism (15) for compressing the refrigerant, a
drive motor (21) disposed below the compression mechanism (15), and
a drive shaft (24) disposed to extend vertically in the casing
(10). The discharge pipe (51) and the suction pipe (52) for the
refrigerant are hermetically joined to the casing (10). The
refrigerant is introduced into the casing (10) through the suction
pipe (52), compressed in the compression mechanism (15), and then
discharged outside the casing (10) through the discharge pipe
(51).
[0019] In the compressor (1), a space in the casing (10) between
the compression mechanism (15) and the drive motor (21) will be
referred to as a space (S1) above the motor (herein referred to as
"above-motor space (S1)"), and a space in the casing (10) above the
compression mechanism (15) as an oil separation space (S2).
[0020] The compression mechanism (15) includes a fixed scroll part
(16) and an orbiting scroll part (17). Each of the fixed scroll
part (16) and the orbiting scroll part (17) is configured as an end
plate and a spiral lap standing upright on the end plate. The lap
of the fixed scroll part (16) and the lap of the orbiting scroll
part (17) mesh with each other to form a compression chamber
enclosed by the laps and the end plates. A lid (41) is fastened to
an upper surface of the fixed scroll part (16) with bolts (41a)
(see FIGS. 6 and 7). The fixed scroll part (16) has an internal
refrigerant discharge pipe (53) extending to an upper portion of
the oil separation space (S2). The internal refrigerant discharge
pipe (53) is an L-shaped pipe that extends vertically upward from
the fixed scroll part (16), curves in the upper portion of the oil
separation space (S2), and extends horizontally along a ceiling of
the casing (10).
[0021] A housing (18) is disposed below the compression mechanism
(15), and an outer peripheral surface of the housing (18) is joined
to an inner wall of the casing (10). The fixed scroll part (16) is
placed on the housing (18) by, e.g., bolt fixing. The housing (18)
and the fixed scroll part (16) sandwich the orbiting scroll part
(17) with an Oldham coupling (42) interposed therebetween. The
housing (18) forms a crank chamber (19). The housing (18) has a
bearing (20) that supports an upper portion of the drive shaft (24)
below the crank chamber (19). The housing (18) is provided with a
refrigerant passage (18a) connected to the lower end of the
internal refrigerant discharge pipe (53) and communicates with the
above-motor space (S1).
[0022] In the present embodiment, the refrigerant introduced into
the compression mechanism (15) through the suction pipe (52) is
compressed and delivered to the above-motor space (S1) above the
motor, passes through the refrigerant passage (18a), the internal
refrigerant discharge pipe (53), and the oil separation space (S2),
and is discharged outside the casing (10) from the discharge pipe
(51) (see open arrows drawn with a broken line in FIGS. 2 and
3).
[0023] The drive motor (21) is, for example, a brushless DC motor,
and is disposed below the housing (18). The drive motor (21)
includes a stator (22) fixed to the inner wall of the casing (10)
and a rotor (23) rotatably housed inside the stator (22) with a
slight gap left between the rotor (23) and the stator (22). The
rotor (23) is connected to the orbiting scroll part (17) at its
center of rotation via the drive shaft (24). A frame (25) is fixed
to the barrel (11) of the casing (10) and supports a lower portion
of the drive shaft (24) below the drive motor (21). An oil
separation plate (25a) is placed on an upper surface of the frame
(25) to separate lubricating oil contained in the compressed
refrigerant descending from the compression mechanism (15). The
separated lubricating oil drops into an oil reservoir (P) at the
bottom of the casing (10).
[0024] The drive shaft (24) connects the compression mechanism (15)
and the drive motor (21) to each other, and extends vertically in
the casing (10). The lower end of the drive shaft (24) is located
in the oil reservoir (P). An oil supply passage (not shown) is
formed inside the drive shaft (24) to penetrate the drive shaft
(24) in the axial direction. When the drive shaft (24) rotates
about its axis, an oil pump (e.g., a trochoid pump) disposed at the
lower end of the drive shaft (24) causes the lubricating oil stored
in the oil reservoir (P) to flow upward in the oil supply passage,
thereby lubricating sliding portions (e.g., pin bearings) of the
compression mechanism (15). Horizontal oil supply holes (not shown)
for supplying the lubricating oil to the sliding portions, such as
the bearing (20), are formed inside the drive shaft (24) to be
connected to the oil supply passage. The lubricating oil flowing
upward in the oil supply passage is supplied to the horizontal oil
supply holes to lubricate the sliding portions of the drive shaft
(24).
Configuration of Lubricating Oil Recovery Mechanism
[0025] A mechanism for recovering the lubricating oil supplied to
lubricate the sliding portions of the compression mechanism (15)
and the drive shaft (24) will be described below.
[0026] The lubricating oil used to lubricate the sliding portions
of the compression mechanism (15) flows into the crank chamber
(19), and is then guided downward through a first oil return
passage (31) as illustrated in FIGS. 2 and 3 (see open arrows drawn
with a solid line in FIGS. 2 and 3). The first oil return passage
(31) is provided with an oil return guide (32) that contracts the
flow of the lubricating oil. At least a lower portion of the oil
return guide (32) is surrounded by an inner wall surface of the
casing (10) and an oil return plate (35) extending downward along
the inner wall surface. The lubricating oil delivered from an
outlet of the oil return guide (32) descends in the space
surrounded by the oil return plate (35) and the inner wall surface
of the casing (10), and returns to the oil reservoir (P) at the
bottom of the casing (10).
[0027] FIG. 4A is a perspective view illustrating the oil return
guide (32) as viewed from the drive shaft (24), and FIG. 4B is a
perspective view illustrating the same as viewed from the casing
(10). As illustrated in FIGS. 4A and 4B, the oil return guide (32)
has a connection hole (32a) connected to the crank chamber (19),
and a flow contraction portion (32b) extending downward along the
inner wall surface of the casing (10), or of the barrel (11). The
flow contraction portion (32b) may be shaped wider in a
circumferential direction, than in a radial direction, of the
cylindrical casing (10). The flow contraction portion (32b) may
have a radial dimension of, for example, about 2 mm to 3 mm, and a
circumferential dimension of, for example, about 10 mm.
[0028] FIG. 5A is a perspective view illustrating the oil return
plate (35) as viewed from the drive shaft (24), and FIG. 5B is a
perspective view illustrating the same as viewed from the casing
(10). As illustrated in FIGS. 5A and 5B, the oil return plate (35)
includes a surrounding portion (32b) surrounding at least a lower
portion (the flow contraction portion (35a)) of the oil return
guide (32) from the side of the drive shaft (24), and a fixed
portion (35b) fixed to the inner wall surface of the casing (10).
The surrounding portion (35a) may be shaped such that a space
between the surrounding portion (35a) and the inner wall surface of
the casing (10) narrows downward from the vicinity of an outlet of
the oil return guide (32). The fixed portion (35b) may have a shape
corresponding to the inner wall surface of the casing (10).
[0029] The oil used to lubricate the teeth of the fixed scroll part
(16) and the end plate of the orbiting scroll part (17), i.e., a
thrust bearing, leaks into the compression chamber during a
compression stroke, merges with the lubricating oil originally
circulating in the system, and is discharged together with the
compressed refrigerant from the compression chamber to the
above-motor space (S1). The lubricating oil in the compressed
refrigerant is in the form of mist.
[0030] A portion of the lubricating oil contained in the descending
compressed refrigerant is separated by the oil separation plate
(25a) and returns to the oil reservoir (P) at the bottom of the
casing (10) as described above. The rest of the lubricating oil
passes through the oil separation space (18a) and the internal
refrigerant discharge pipe (53) and is discharged to the
refrigerant passage (S2) together with the compressed refrigerant
(see the open arrows drawn with a broken line in FIGS. 2 and 3).
The compressed refrigerant is discharged to the oil separation
space (S2) along the tangential direction of the internal wall
surface of the casing (10) (top wall portion (12)), and the
discharged compressed refrigerant swirls along the internal wall
surface of the top wall portion (12) in the oil separation space
(S2) (see a broken line arrow F in FIG. 3). At this time, the
lubricating oil contained in the compressed refrigerant is
scattered toward the inner wall surface of the top wall portion
(12) under the centrifugal force generated by the swirling flow,
and collides with the inner wall surface of the top wall portion
(12). The lubricating oil that has collided and turned to a liquid
film falls along the inner wall surface of the top wall portion
(12), and is discharged from an upper oil discharge hole (16a)
formed in the fixed scroll part (16) to the above-motor space (S1)
through a second oil return passage (33) (see the open arrows drawn
with a solid line in FIGS. 2 and 3). The compressed refrigerant
from which the lubricating oil has been separated in the oil
separation space (S2) is discharged outside the casing (10) through
the discharge pipe (51).
[0031] In the present embodiment, a pipe (34) penetrating the fixed
scroll part (16) and the housing (18) constitutes the second oil
return passage (33). The pipe (34) has an inner diameter of, for
example, about 2 mm.
[0032] FIG. 6 is a perspective view illustrating the compression
mechanism (15), the housing (18), and other adjacent components
before the second oil return passage (33), i.e., the pipe (34), is
attached, and FIG. 7 is a perspective view illustrating the same
after the second oil return passage (33), i.e., the pipe (34), is
attached.
[0033] As illustrated in FIGS. 2, 3, 6, and 7, the fixed scroll
part (16) is provided with the upper oil discharge hole (16a)
vertically penetrating the fixed scroll part (16), and the housing
(18) is provided with a lower oil discharge hole (18b) that
vertically penetrates the housing (18) and is connected to the
upper oil discharge hole (16a). The pipe (34) serving as the second
oil return passage (33) is inserted into the upper oil discharge
hole (16a) and the lower oil discharge hole (18b). The lower
portion of the pipe (34) protrudes in the above-motor space (S1)
below the housing (18), and a lower end of the pipe (34), i.e., an
outlet of the second oil return passage (33), is disposed near the
outlet of the oil return guide (32). The oil return plate (35) is
disposed to surround, together with the inner wall surface of the
casing (10), at least the lower portion of the oil return guide
(32) and at least the lower portion of the pipe (34). Thus, the
lubricating oil delivered from the lower end of the pipe (34),
i.e., the outlet of the second oil return passage (33), descends in
the space surrounded by the oil return plate (35) and the inner
wall surface of the casing (10), and returns to the oil reservoir
(P) at the bottom of the casing (10).
[0034] The oil return plate (35) may be shaped such that the space
between the oil return plate (35) and the inner wall surface of the
casing (10) narrows downward from the vicinity of the outlets of
the oil return guide (32) and the pipe (34).
Advantages of Embodiment
[0035] In the compressor (1) of the embodiment described above, the
outlet of the second oil return passage (33) for the lubricating
oil separated in the oil separation space (S2) in the upper portion
of the casing (10) is disposed near the outlet of the oil return
guide (32) that contracts the flow of the lubricating oil
discharged downward from the crank chamber (19). This configuration
can guide the lubricating oil separated in the oil separation space
(S2) downward through the second oil return passage (33) under the
negative pressure generated not by the contraction of the flow of
the refrigerant gas, but by the contraction of the flow of the
lubricating oil. Thus, the lubricating oil separated in the oil
separation space (S2) does not merge into the flow of the
refrigerant gas again, reducing the oil loss more effectively.
[0036] More specifically, the oil that has lubricated the sliding
portions (pin bearing, upper main bearing, etc.) of the compression
mechanism (15) and the drive shaft (24) once flows into the crank
chamber (19), and then returns to the oil reservoir (P) through the
oil return guide (32) and the oil return plate (35). When the
lubricating oil is guided from the crank chamber (19) to the oil
return guide (32), the oil flow is contracted. In particular, a
static pressure of a space around the outlet of the oil return
guide (32) surrounded by the oil return plate (35) is lower than
static pressures of the above-motor space (S1) and the oil
separation space (S2). Thus, when the outlet of the second oil
return passage (33) is disposed near the outlet of the oil return
guide (32), the oil in a liquid state separated in the top space
serving as the oil separation space (S2) is discharged into the
space surrounded by the oil return plate (35) through the second
oil return passage (33), i.e., the pipe (34), and returns to the
oil reservoir (P) as it is.
[0037] Specifically, the compressor (1) having the top space
serving as the oil separation space (S2) contracts the flow of the
oil discharged from the crank chamber (19), and allows a region
where the contraction occurs and the oil separation space (S2) to
communicate with each other through the second oil return passage
(33). Thus, the separated oil can return to the oil reservoir (P)
together with the flow of the discharged oil. This can reduce the
oil loss of the compressor (1) more effectively.
[0038] As described above, the compressor (1) of the present
embodiment can reduce the oil loss more effectively than a known
compressor in which liquid oil separated in the top space is
discharged into the discharged refrigerant gas. The top space
serving as the oil separation space (S2) basically separates the
oil as effectively as a known oil separator that is independently
provided. Thus, the compressor (1) can be provided without such an
oil separator, reducing the cost and size of an air-conditioning
system such as a refrigeration apparatus.
[0039] When the compressor (1) of the present embodiment includes
the pipe (34) passing through the housing (18) as the second oil
return passage (33), the structure of the second oil return passage
(33) can be simplified.
[0040] The compressor (1) of the present embodiment further
includes an oil return plate (35) disposed to surround, together
with the inner wall surface of the casing (10), at least a lower
portion of the second oil return passage (33) and at least a lower
portion of the oil return guide (32). This configuration can keep
the lubricating oil delivered from the outlets of the second oil
return passage (33) and the oil return guide (32) from scattering.
In this case, when a space surrounded by the oil return plate (35)
and the inner wall surface of the casing (10) narrows downward from
the vicinity of the outlets of the second oil return passage (33)
and the oil return guide (32), the lubricating oil flows faster as
it goes downward. This can efficiently guide the lubricating oil
downward.
Other Embodiments
[0041] In the above embodiment, the compressor (1) having the
configuration shown in
[0042] FIG. 2 has been described. In the present disclosure,
however, the compressor is not limited to have such a configuration
as long as the top space is used as the oil separation space and
the lubricating oil is stored in the bottom. For example, the shape
of the oil return guide (32) shown in FIGS. 4A and 4B and the shape
of the oil return plate (35) shown in FIGS. 5A and 5B are merely
examples, and the oil return guide (32) and the oil return plate
(35) are not limited to have these shapes.
[0043] In the above embodiment, the whole second oil return passage
(33) is formed of the pipe (34). However, the upper oil discharge
hole (16a) and the lower oil discharge hole (18b) may be used as
part of the second oil return passage (33) as they are.
Alternatively, the second oil return passage (33) having no upper
oil discharge hole (16a) may be formed without providing the fixed
scroll part (16) on the lower oil discharge hole (18b) of the
housing (18).
[0044] Instead of the oil return plate (35) disposed in the above
embodiment, for example, the oil return guide (32) and the pipe
(34) may further extend downward to eliminate the need of the oil
return plate (35).
[0045] In place of a circular tube extending in an L-shape arranged
as the internal refrigerant discharge pipe (53) of the above
embodiment, for example, a sheet metal member (54) as shown in
FIGS. 8A and 8B may be attached to the inner wall of the top wall
portion (12) to serve as the internal refrigerant discharge pipe.
FIG. 8A is a perspective view illustrating the sheet metal member
(54) as viewed from the drive shaft, and FIG. 8B is a perspective
view illustrating the same as viewed from the casing. As
illustrated in FIGS. 8A and 8B, the sheet metal member (54) has a
pipe wall portion (54a) that forms a conduit serving as the
internal refrigerant discharge pipe between the pipe wall portion
(54a) and the internal wall of the top wall portion (12), and a
fixed portion (54b) fixed to the internal wall surface of the top
wall portion (12). The pipe wall portion (54a) may extend
vertically upward from the fixed scroll part (16), curve in an
upper portion of the oil separation space (S2), and extend
horizontally. The fixed portion (54b) may have a shape
corresponding to the inner wall surface of the top wall portion
(12).
[0046] While the embodiments have been described above, it will be
understood that various changes in form and details can be made
without departing from the spirit and scope of the claims. The
embodiment and other embodiments may be combined and replaced with
each other without deteriorating intended functions of the present
disclosure. The expressions of "first" and "second" described above
are used to distinguish the terms to which these expressions are
given, and do not limit the number and order of the terms.
[0047] The present disclosure is useful for a compressor and a
refrigeration apparatus.
* * * * *