CN118318104A

CN118318104A - Rotary compressor

Info

Publication number: CN118318104A
Application number: CN202380014751.6A
Authority: CN
Inventors: 岛谷纮史; 江崎郁男
Original assignee: Mitsubishi Heavy Industries Thermal Systems Ltd
Current assignee: Mitsubishi Heavy Industries Thermal Systems Ltd
Priority date: 2022-05-23
Filing date: 2023-05-18
Publication date: 2024-07-09
Also published as: WO2023228862A1; JP2023172146A; AU2023277043A1

Abstract

Provided is a rotary compressor capable of reducing vibration during driving. The device is provided with: a housing (2) having a cylindrical portion (21) extending in a height direction along a center axis (CL 2); a rotary compression unit (6) which is accommodated in the case (2) and is fixed to the cylindrical unit (21) by a plurality of welded parts (70) formed in the circumferential direction around the center axis (CL 2) to compress the refrigerant; an electric motor accommodated in the housing (2) and driving the rotary compression unit (6); and a plurality of legs (7) provided on the outer peripheral surface (21 b) of the cylindrical portion (21) for fixing the housing (2) to the installation surface, wherein the positions of the legs (7) correspond to the positions of the welded portions (70) in the circumferential direction.

Description

Rotary compressor

Technical Field

The present disclosure relates to a rotary compressor.

Background

Among compressors used in refrigeration apparatuses, air conditioning apparatuses, and the like, there is a rotary compressor (for example, patent document 1).

In a conventional rotary compressor having a large weight, vibration caused by driving of a compression portion (for example, rotation of a piston rotor) tends to be suppressed by its own weight. However, as the rotary compressor is made lighter, problems associated with vibration become significant.

Prior art literature

Patent literature

Patent document 1: japanese patent laid-open No. 58-131392

Disclosure of Invention

Problems to be solved by the invention

When vibration occurs, the mountability to a product may be lowered.

In addition, if the refrigerant pipe is broken by vibration, the refrigerant inside the pipe may leak to the outside. In particular, when a flammable refrigerant (an example of class (class) is A2L, A) is used as the refrigerant, there is a higher necessity to avoid leakage of the refrigerant.

The present disclosure has been made in view of such circumstances, and an object thereof is to provide a rotary compressor capable of reducing vibration during driving.

Technical proposal

In order to solve the above problems, a rotary compressor of the present disclosure includes: a housing having a cylindrical portion extending in a height direction along an axis; a compression portion accommodated in the casing, fixed to the cylindrical portion by a plurality of welded portions formed in a circumferential direction around the axis, and compressing a refrigerant; a driving unit accommodated in the housing and driving the compressing unit; and a plurality of leg portions provided on an outer peripheral surface of the cylindrical portion for fixing the housing to the mounting surface, the leg portions being positioned corresponding to the positions of the welded portions in the circumferential direction.

Effects of the invention

According to the rotary compressor of the present disclosure, vibration in driving can be reduced.

Drawings

Fig. 1 is a longitudinal sectional view showing a rotary compressor of one embodiment of the present disclosure.

Fig. 2 is a top view illustrating a rotary compressor of one embodiment of the present disclosure.

Fig. 3 is a side view showing a state in which the rotary compressor of fig. 1 is provided on a setting surface.

Fig. 4 is a partial enlarged view of the portion a shown in fig. 1.

Fig. 5 is a plan view showing a modification of the rotary compressor of the embodiment of the present disclosure.

Detailed Description

An embodiment of the present disclosure will be described below with reference to the accompanying drawings.

As shown in fig. 1, a rotary compressor (hereinafter, simply referred to as "compressor") 1 of the present embodiment is, for example, a hermetic electric rotary compressor used in an air conditioner, a refrigerating apparatus, or the like. The compressor 1 has a weight of 6.5kg or less, and includes a compressor body 10 and an accumulator 12. The accumulator 12 is connected to the compressor body 10 via a suction pipe 11.

[ Basic Structure for compressor ]

The compressor body 10 includes a substantially cylindrical casing 2, a rotary shaft body 3, an electric motor (driving unit) 5, and a rotary compression unit (compression unit) 6.

The rotation axis CL1 of the rotation shaft body 3 coincides with the center axis CL2 of the housing 2.

The rotary shaft body 3 is disposed so that the extending direction is in the up-down direction, and rotates around the rotation axis CL1 in the housing 2.

The housing 2 is airtight and extends in the up-down direction. This vertical direction coincides with the height direction of the housing 2 when the compressor 1 is provided on the installation surface FL, for example (see fig. 3).

The housing 2 includes: the cylindrical portion 21 extends in the height direction along the center axis CL2 and is cylindrical; and an upper cover 22 and a lower cover 23 that block the upper and lower openings of the cylindrical portion 21. The outer diameter of the cylindrical portion 21 is set to, for example, 95mm or less.

A plurality of leg portions 7 are fixed to the outer peripheral surface 21b below the cylindrical portion 21.

As shown in fig. 2, the leg portions 7 are arranged at predetermined angular intervals in the circumferential direction. In the case of fig. 2, the three legs 7 are arranged at intervals of about 120 degrees in the circumferential direction.

For simplicity of explanation, fig. 2 is a diagram in which some components (for example, detailed components such as the accumulator 12, the upper cover 22, the rotary shaft 3, and the upper bearing 4A) are omitted.

As shown in fig. 3, the compressor 1 is provided by fixing each leg portion 7 to the installation surface FL via the vibration isolation rubber 8.

As shown in fig. 1, the housing 2 has an opening 24 formed in a lower portion of the side wall at a position facing the outer peripheral surface of the cylinder 60. In the cylinder 60, a suction port 25 that communicates to a predetermined position in the cylinder is formed at a position facing the opening 24.

An oil groove for storing lubricating oil is formed in the bottom of the housing 2. The liquid surface of the oil tank at the time of initial oil filling is located above the rotary compression part 6. Thereby, the rotary compressor 6 is driven in the oil sump.

The upper cover 22 is provided with a drain pipe 13 and a terminal block 30. The discharge pipe 13 penetrates the upper cover 22 in the thickness direction, and is disposed in the housing 2 at its lower portion and outside the housing 2 at its upper portion. The discharge pipe 13 discharges the compressed refrigerant to the outside of the casing 2. The terminal block 30 is provided with three power supply terminals 31 for supplying power to the electric motor 5. Three-phase ac power is supplied to the power supply terminal 31 from an inverter device not shown.

The accumulator 12 is used to perform gas-liquid separation of the refrigerant before the refrigerant is supplied to the compressor body 10. The accumulator 12 is formed in a substantially cylindrical shape, and is fixed to the housing 2 (the outer peripheral surface 21b of the cylindrical portion 21) via the bracket 14. An inlet pipe 15 for introducing the refrigerant led from the evaporator, not shown, is provided at the upper portion of the accumulator 12. A suction pipe 11 for sucking the refrigerant inside the compressor body 10 is connected to the accumulator 12. The suction pipe 11 passes through the opening 24 of the housing 2 and is connected to the suction port 25. The accumulator 12 supplies the refrigerant in the gas phase to the rotary compression part 6 via the suction pipe 11.

The electric motor 5 is accommodated in a central portion in the up-down direction in the housing 2. The electric motor 5 has a rotor 51 and a stator 52.

The rotor 51 is fixed to the outer peripheral surface of the rotary shaft body 3, and is disposed above the rotary compression unit 6.

The stator 52 is disposed so as to surround the outer peripheral surface of the rotor 51, and is fixed (for example, heat press-fitted) to the inner peripheral surface 21a of the cylindrical portion 21 of the housing 2. Power is supplied from each power supply terminal 31 to the stator 52 via the wiring 32.

The electric motor 5 is configured such that the rotor 51 is rotated by electric power supplied from the power supply terminal 31. Further, by rotating the rotor 51, the rotary shaft body 3 is rotationally driven about the rotation axis CL 1. At this time, the rotation of the electric motor 5 is vector-controlled.

The rotary compression unit 6 includes a cylinder 60, an upper bearing 4A, and a lower bearing 4B, and the cylinder 60 is disposed at a lower portion (bottom portion) in the vertical direction in the casing 2 in a state sandwiched by the upper bearing 4A and the lower bearing 4B from above and below.

The upper bearing 4A and the lower bearing 4B are each formed of a metal material, and are fixed to the cylinder 60 by bolts 61.

Here, the rotary shaft body 3 is rotatably supported about the rotation axis CL1 by an upper bearing 4A and a lower bearing 4B.

The rotary compression unit 6 further includes an eccentric shaft portion 62 and a piston rotor 63 provided around the eccentric shaft portion 62.

The eccentric shaft portion 62 is formed at the lower portion of the rotary shaft body 3, and is provided in a state shifted in a direction orthogonal to the rotation axis CL1 of the rotary shaft body 3 in a space formed by the inner peripheral surface of the piston rotor 63.

The piston rotor 63 has a cylindrical shape with an outer diameter smaller than the inner diameter of the cylinder 60, is disposed in a space formed by the inner peripheral surface of the cylinder 60, and is fixed in a state of being attached to the outer peripheral surface of the eccentric shaft portion 62.

The piston rotor 63 eccentrically rotates with respect to the rotation axis CL1 along with the rotation of the rotation shaft body 3.

The rotary compression unit 6 is formed with a compression chamber 60A, a suction hole 60B, and a discharge hole (not shown).

The compression chamber 60A is defined by sandwiching a space formed by the inner peripheral surface of the cylinder 60 with the upper bearing 4A and the lower bearing 4B. The piston rotor 63 is accommodated in the compression chamber 60A.

The suction hole 60B is a hole for guiding the refrigerant from the outside of the cylinder 60 to the compression chamber 60A, and is formed in the cylinder 60 in a direction orthogonal to the rotation axis CL 1.

The rotary compression portion 6 configured as described above is fixed to the housing 2. Specifically, as shown in fig. 1 and 2, the rotary compression portion 6 is fixed by, for example, plug welding (plug welding) the upper bearing 4A to a plurality of portions in the circumferential direction of the cylindrical portion 21.

As shown in fig. 4, the plug welding fixes the upper bearing 4A to the housing 2 by forming a welded portion 70 penetrating the cylindrical portion 21 from the outer peripheral surface 21b of the cylindrical portion 21 to reach the upper bearing 4A. Therefore, the welded portion 70 is a fixed portion between the casing 2 and the rotary compression portion 6, and is also an excitation position (excitation source) for transmitting vibration and mechanical reaction force from the rotary compression portion 6 to the casing 2.

As shown in fig. 2, from the viewpoint of balance of forces, it is preferable that the positions of the welded portions 70 are arranged at equal angular intervals in the circumferential direction, and in the case of fig. 2, three welded portions 70 are formed at intervals of about 120 degrees in the circumferential direction.

The welded portion 70 is not limited to three, but may be, for example, four or more.

Further, the welded portion 70 may be formed in the cylinder 60 instead of the upper bearing 4A. That is, the cylinder 60 may be plug-welded to the cylindrical portion 21.

The compressor 1 configured as above operates as follows.

Refrigerant led from an evaporator, not shown, is introduced into the accumulator 12 via the inlet pipe 15.

The refrigerant is separated from the accumulator 12 in gas-liquid state, and the gas phase of the refrigerant is guided to the rotary compression section 6 through the suction pipe 11. In the rotary compression portion 6, the refrigerant is guided to the compression chamber 60A through the suction hole 60B.

Then, by the eccentric rotation of the piston rotor 63, the volume of the compression chamber 60A gradually decreases so that the refrigerant is compressed.

The compressed refrigerant is guided to a space formed between the discharge cover 65 and the upper bearing 4A through a discharge hole (not shown) formed in the cylinder 60, and is discharged to a space in the housing 2.

The refrigerant discharged into the space in the casing 2 is guided from the discharge pipe 13 provided in the upper portion of the casing 2 to a condenser not shown.

[ Position of leg ]

As shown in fig. 2, when the compressor 1 is viewed in plan from a direction along the center axis CL2, the position of the leg portion 7 corresponds to the position of the welded portion 70 in the circumferential direction with respect to the center axis CL 2.

This allows the leg portion 7 to approach the welded portion 70, which is the excitation position of the case 2.

The term "corresponding" as used herein means that the leg portion 7 overlaps the welded portion 70 in the circumferential direction. In other words, "corresponding" means that the welded portion 70 is located directly above the leg portion 7, as shown in fig. 1 and 2.

In detail, the leg 7 is configured to: in the state of plan view as shown in fig. 2, when a line passing through the center axis CL2 and the center position of the welded portion 70 is defined as a line L1 and a line passing through the center axis CL2 and the center position of the leg portion 7 is defined as a line L2, the line L2 falls within a range of ±10 degrees with respect to the line L1 as a reference, with the center axis CL2 being the center of the angle.

Further, it is preferable that the leg portion 7 is arranged so that the line L2 coincides with the line L1.

Further, as shown in fig. 1, when the compressor 1 is viewed from a side view in a direction perpendicular to the center axis CL2, the position of the leg portion 7 preferably corresponds to the position of the rotary compression portion 6 in the height direction of the tubular portion 21.

This allows the leg portion 7 to be brought closer to the welded portion 70, which is the excitation position of the case 2.

The term "corresponding to" as used herein means that the leg portion 7 overlaps any one of the members constituting the rotary compression portion 6 in the height direction. In the case of fig. 1, the leg portion 7 overlaps with the lower bearing 4B constituting the rotary compression portion 6 in the height direction.

The above-described operation and effects of the present embodiment are as follows.

Since the position of the leg portion 7 corresponds to the position of the welded portion 70 in the circumferential direction, the welded portion 70, which is the excitation position, is brought close to the leg portion 7, and the reaction force generated at the welded portion 70 is easily received by the leg portion 7. Thereby, vibration of the compressor 1 caused by the reaction force can be reduced. Therefore, for example, the casing 2 is thinned, so that the compressor 1 can be miniaturized, light-weighted, and reduced in material cost.

Further, when the electric motor 5 is used as a driving unit for driving the rotary compressor 6 and the rotation of the electric motor 5 is vector-controlled, the leg 7 receives the reaction force at the welded portion 70, so that the torsion of the tubular portion 21 (the housing 2) can be reduced, and the deterioration of the controllability due to the phase shift between the stator 52 and the rotor 51 can be suppressed.

The torsion of the cylindrical portion 21 occurs as follows.

That is, the driving of the rotary compression portion 6 causes a force in the circumferential direction generated by the reaction force at the welded portion 70 to act on the cylindrical portion 21. Further, due to the rotation of the electric motor 5, a force in the circumferential direction generated by the torque reaction force received by the stator 52 acts on the cylindrical portion 21 to which the stator 52 is fixed.

Since these two forces are combined, the tubular portion 21 is subjected to a torsional displacement such as to oscillate in the circumferential direction during the driving of the rotary compression portion 6. Further, since the cylindrical portion 21 is twisted such as to swing, the stator 52 fixed to the inner peripheral surface 21a of the cylindrical portion 21 also swings in the circumferential direction. In this case, a relative phase shift occurs between the stator 52 and the rotor 51.

In addition, when the position of the leg portion 7 is made to correspond to the position of the rotary compression portion 6 in the height direction, the leg portion 7 can be made to be closer to the welded portion 70 as the excitation position. Thereby, the reaction force at the welded portion 70 is more easily received by the leg portion 7.

In addition, in the case where the center position in the circumferential direction of the leg portion 7 is made coincident with the center position in the circumferential direction of the welded portion 70, the leg portion 7 can be brought closest to the welded portion 70 as the excitation position. Thereby, the reaction force at the welded portion 70 is more easily received by the leg portion 7.

Further, in the case where the welded portion 70 and the leg portion 7 are arranged at substantially equiangular intervals in the circumferential direction, the reaction force at the welded portion 70 can be uniformly handled.

Modification example

As shown in fig. 5, an auxiliary leg 9 may be provided between one leg 7 corresponding to the position of the welded portion 70 and the adjacent leg 7 (preferably, an intermediate position).

The auxiliary leg 9 is provided on the outer peripheral surface 21b below the tubular portion 21 at a predetermined angular interval in the circumferential direction, similarly to the leg 7. The auxiliary leg 9 is provided at the same height as the leg 7. The auxiliary leg 9 is fixed to the installation surface FL via the vibration isolation rubber 8, similarly to the leg 7.

With this configuration, the reaction force at the welded portion 70 can be received not only by the leg portion 7 but also by the auxiliary leg portion 9. This can further reduce vibration of the compressor 1 and torsion of the cylindrical portion 21 (housing 2).

In the case of fig. 5, the auxiliary leg portions 9 are provided between all the leg portions 7, but it is not necessarily required to provide the auxiliary leg portions 9 between all the leg portions 7.

The rotary compressor (1) described in each of the embodiments described above is grasped as follows, for example.

The rotary compressor of the first aspect of the present disclosure includes: a housing (2) having a cylindrical portion (21) extending in a height direction along an axis (CL 2); a compression unit (6) which is accommodated in the case, is fixed to the cylindrical unit by a plurality of welded parts (70) formed in the circumferential direction around the axis, and compresses a refrigerant; a driving unit (5) accommodated in the casing and driving the compression unit; and a plurality of leg portions (7) provided on an outer peripheral surface (21 b) of the cylindrical portion, for fixing the housing to a mounting surface (FL), the leg portions being positioned corresponding to the positions of the welded portions in the circumferential direction.

According to the present invention, a rotary compressor includes: a housing having a cylindrical portion extending in a height direction along an axis; a compression portion accommodated in the case, fixed to the cylindrical portion by a plurality of welding portions formed in a circumferential direction around the axis, and compressing the refrigerant; a driving part accommodated in the housing and driving the compressing part; and a plurality of legs provided on the outer peripheral surface of the cylindrical portion for fixing the housing to the mounting surface, wherein the positions of the legs correspond to the positions of the welded portions in the circumferential direction, so that the welded portions, which are provided as connection portions with the compressed portions and are excitation positions for the cylindrical portion (housing), are brought close to the legs, whereby the reaction force at the welded portions is easily received by the legs. Thereby, vibration of the rotary compressor caused by the reaction force can be reduced. Therefore, for example, the casing can be thinned, so that the compressor can be miniaturized, light-weighted, and reduced in material cost.

Further, by receiving the reaction force with the leg portion, torsion of the cylindrical portion (housing) caused by the reaction force can be reduced. Therefore, a problem of the driving portion caused by torsion of the cylindrical portion (housing) (for example, a decrease in controllability caused by a phase shift of the stator relative to the rotor in the case where the driving portion is an electric motor) can be suppressed.

Regarding the rotary compressor of the second aspect of the present disclosure, in the first aspect, the driving part is provided as an electric motor (5), and the electric motor (5) has a stator (52) fixed to the housing and a rotor (51) connected to the compressing part.

According to the rotary compressor of the present embodiment, since the driving portion is provided as the electric motor having the stator fixed to the housing and the rotor connected to the compression portion, the reaction force at the welded portion provided at the connection portion with the compression portion is received by the leg portion, and therefore, the torsion of the tubular portion (housing) caused by the reaction force at the welded portion and the torque reaction force received by the stator can be reduced, and the deterioration of the controllability caused by the phase shift of the stator relative to the rotor can be suppressed.

With regard to the rotary compressor of the third aspect of the present disclosure, in the first aspect or the second aspect, the position of the leg portion corresponds to the position of the compression portion in the height direction.

According to the rotary compressor of the present invention, the position of the leg portion corresponds to the position of the compression portion in the height direction, so that the leg portion can be brought closer to the welded portion as the excitation position. Thereby, the reaction force at the welded portion is more easily received by the leg portion.

With regard to the rotary compressor of the fourth aspect of the present disclosure, in any one of the first to third aspects, a center position in the circumferential direction of the leg portion coincides with a center position in the circumferential direction of the welded portion.

According to the rotary compressor of the present embodiment, the center position in the circumferential direction of the leg portion coincides with the center position in the circumferential direction of the welded portion, so that the leg portion can be brought closest to the welded portion as the excitation position. Thereby, the reaction force at the welded portion is more easily received by the leg portion.

With regard to the rotary compressor of the fifth aspect of the present disclosure, in any one of the first to fourth aspects, the welded portion and the leg portion are arranged at substantially equiangular intervals in the circumferential direction.

According to the rotary compressor of the present embodiment, the welded portion and the leg portion are arranged at substantially equiangular intervals in the circumferential direction, so that the reaction force at the welded portion can be uniformly handled.

In a rotary compressor pertaining to a sixth aspect of the present disclosure, in any one of the first to fifth aspects, an auxiliary leg portion (9) is provided, the auxiliary leg portion (9) being provided on the outer peripheral surface of the cylindrical portion between the leg portion and the leg portion adjacent thereto.

According to the rotary compressor of the present invention, since the auxiliary leg portion is provided on the outer peripheral surface of the cylindrical portion between the leg portion and the leg portion adjacent thereto, the auxiliary leg portion can receive the reaction force not only at the welded portion as the excitation position but also at the welded portion as the excitation position by the leg portion. This can further reduce vibration of the rotary compressor and torsion of the cylindrical portion (housing).

Description of the reference numerals

1: A compressor (rotary compressor);

2: a housing;

3: a rotating shaft body;

4A: an upper bearing;

4B: a lower bearing;

5: an electric motor (driving unit);

6: a rotary compression unit;

7: a leg portion;

8: vibration-proof rubber;

9: auxiliary legs;

10: a compressor main body;

11: a suction pipe;

12: an accumulator;

13: a discharge pipe;

14: a bracket;

15: an inlet pipe;

21: a cylindrical portion;

21a: an inner peripheral surface;

21b: an outer peripheral surface;

22: an upper cover part;

23: a lower cover part;

24: an opening portion;

25: a suction port;

30: a terminal block;

31: a power supply terminal;

32: wiring;

51: a rotor;

52: a stator;

60: a cylinder;

60A: a compression chamber;

60B: a suction hole;

61: a bolt;

62: an eccentric shaft portion;

63: a piston rotor;

65: a discharge cover;

70: a welding part;

CL1: an axis of rotation;

CL2: a central axis;

FL: and (5) setting a surface.

Claims

1. A rotary compressor is provided with:

a housing having a cylindrical portion extending in a height direction along an axis;

a compression portion accommodated in the casing, fixed to the cylindrical portion by a plurality of welding portions formed in a circumferential direction around the axis, and compressing a refrigerant;

A driving unit accommodated in the housing and driving the compressing unit; and

And a plurality of leg portions provided on an outer peripheral surface of the cylindrical portion for fixing the housing to the mounting surface, the leg portions being positioned corresponding to the positions of the welded portions in the circumferential direction.

2. The rotary compressor of claim 1, wherein,

The driving portion is provided as an electric motor having a stator fixed to the housing and a rotor connected to the compressing portion.

3. The rotary compressor of claim 1 or 2, wherein,

The position of the leg portion corresponds to the position of the compression portion in the height direction.

4. The rotary compressor of claim 1 or 2, wherein,

A center position of the leg portion in the circumferential direction coincides with a center position of the welded portion in the circumferential direction.

5. The rotary compressor of claim 1 or 2, wherein,

The welded portion and the leg portion are arranged at substantially equiangular intervals in the circumferential direction.

6. The rotary compressor of claim 1 or 2, wherein,

The rotary compressor includes an auxiliary leg portion provided on the outer peripheral surface of the cylindrical portion between the leg portion and the leg portion adjacent thereto.