Compressors and equipment

Abstract

The objective is to provide a compressor and equipment that can suppress residual stress and thermal distortion in mechanical components caused by welding. [Solution] The compressor 100 of the present invention is a compressor 100 having a mechanical member fixed to the sealed container 1 by welding from the outer surface of the sealed container 1 inside the sealed container 1, wherein the mechanical member is welded to the sealed container 1 by a plurality of welds 40, and all of the plurality of welds 40 are at different heights, and the circumferential distance L between adjacent welds 40 are all different.

Description

Technical Field

[0001] The present invention relates to a compressor having a mechanical member fixed to a hermetic container by welding from an outer circumferential surface of the hermetic container inside the hermetic container, and an apparatus using the compressor.

Background Art

[0002] Patent Document 1 and Patent Document 2 disclose a compressor in which mechanical members are welded at different heights from the outer circumferential surface of a hermetic container.

Prior Art Documents

Patent Documents

[0003]

Patent Document 1

Patent Document 2

Summary of the Invention

Problem to be Solved by the Invention

[0004] When welding a mechanical member to a hermetic container, residual stress and thermal distortion occur in the mechanical member.

[0005] An object of the present invention is to provide a compressor and an apparatus that can suppress residual stress and thermal distortion of a mechanical member caused by welding fixation.

Means for Solving the Problem

[0006] The compressors 100 and 110 according to the present invention described in claim 1 are compressors 100 and 110 having a mechanical member fixed to the hermetic container 1 by welding from an outer circumferential surface of the hermetic container 1 inside the hermetic container 1, wherein the mechanical member is welded to the hermetic container 1 by a plurality of weld parts 40, and all of the plurality of weld parts 40 are at different heights. The present invention as described in claim 2 is characterized in that, in the compressors 100 and 110 described in claim 1, the circumferential distance L between adjacent welded portions 40 is all different. The present invention as described in claim 3 is characterized in that, in the compressor 100, 110 as described in claim 1, the welded portion 40 is a first welded portion 41, a second welded portion 42, and a third welded portion 43, the second welded portion 42 is located at a distance of a first distance H1 from the first welded portion 41, and the third welded portion 43 is located at a distance of a second distance H2 from the first welded portion 41, wherein the first distance H1 and the second distance H2 are different. The present invention as described in claim 4 is characterized in that, in the compressors 100 and 110 described in claim 3, the distance from the first welded portion 41 to the second welded portion 42 is defined as the first circumferential distance L1, the distance from the second welded portion 42 to the third welded portion 43 is defined as the second circumferential distance L2, and the first circumferential distance L1 and the second circumferential distance L2 are different. The present invention as described in claim 5 is characterized in that, in the compressor 100 described in claim 1, the compression mechanism 10 has a fixed scroll 11, an orbiting scroll 12, and a rotating shaft 13 that orbits the orbiting scroll 12, and below the fixed scroll 11 and the orbiting scroll 12 a main bearing 30 is provided to support the fixed scroll 11 and the orbiting scroll 12, and the main bearing 30 is the mechanical member. The present invention as described in claim 6 is characterized in that, in the compressor 110 described in claim 1, the compression mechanism 10 is composed of at least a cylinder 16a, a piston 16b, a vane, a main bearing 16c, and a sub-bearing 16d, and the cylinder 16a or the main bearing 16c is the mechanical member. The apparatus of the present invention described in claim 7 is an apparatus using the compressors 100 and 110 described in any one of claims 1 to 6, characterized in that the compressors 100 and 110, the condenser 51, the pressure reducing device 52, and the evaporator 54 are connected in a ring shape by refrigerant piping 55. [Effects of the Invention]

[0007] According to the present invention, by making all of the multiple welded joints at different heights, residual stress and thermal distortion in the mechanical components can be suppressed, and a highly efficient and reliable compressor can be provided. [Brief explanation of the drawing]

[0008] [Figure 1] Longitudinal cross-sectional view of a scroll compressor according to one embodiment of the present invention. [Figure 2] Figure 1 shows the welded joint of a sealed container. [Figure 3] Longitudinal cross-sectional view of a rotary compressor according to another embodiment of the present invention [Modes for carrying out the invention]

[0009] In the first embodiment of the present invention, the compressor's mechanical components are welded to a sealed container by multiple welds, each with a different height. According to this embodiment, residual stress and thermal distortion of the mechanical components can be suppressed, providing a highly efficient and reliable compressor.

[0010] A second embodiment of the present invention is a compressor according to the first embodiment, wherein the circumferential distances between adjacent welds are all different. According to this embodiment, residual stress and thermal distortion of the mechanical members can be further suppressed, and a highly efficient and reliable compressor can be provided.

[0011] A third embodiment of the present invention is a compressor according to the first embodiment, wherein the welded parts are a first welded part, a second welded part, and a third welded part, the second welded part is located at a distance of first distance from the first welded part, and the third welded part is located at a distance of second distance from the first welded part, and the first and second distances are different. According to this embodiment, by reducing the number of welded parts, residual stress and thermal distortion of the mechanical members can be further suppressed.

[0012] A fourth embodiment of the present invention is a compressor according to the first embodiment, wherein the distance from the first weld to the second weld is defined as the first circumferential distance, and the distance from the second weld to the third weld is defined as the second circumferential distance, and the first circumferential distance and the second circumferential distance are different. According to this embodiment, residual stress and thermal distortion of the mechanical members can be further suppressed.

[0013] A fifth embodiment of the present invention is a compressor according to the first embodiment, wherein the compression mechanism includes a fixed scroll, an orbital scroll, and a rotating shaft that orbits the orbital scroll, and a main bearing supporting the fixed scroll and the orbital scroll is provided below the fixed scroll and the orbital scroll, and the main bearing is a mechanical component. According to this embodiment, stable drive operation can be achieved by suppressing residual stress and thermal distortion of the main bearing.

[0014] A sixth embodiment of the present invention is a compressor according to the first embodiment, wherein the compression mechanism comprises at least a cylinder, a piston, vanes, a main bearing, and a sub-bearing, and the cylinder or main bearing is a mechanical component. According to this embodiment, stable drive operation can be achieved by suppressing residual stress and thermal distortion in the cylinder or main bearing.

[0015] The seventh embodiment of the present invention is an apparatus using the compressor described in any of the first to sixth embodiments, wherein the compressor, condenser, pressure reducing device, and evaporator are connected in a ring shape by refrigerant piping. According to this embodiment, a highly efficient and reliable apparatus can be provided. [Examples]

[0016] The following describes a compressor according to one embodiment of the present invention. However, the present invention is not limited to this embodiment. Furthermore, although this embodiment uses a scroll compressor, it may also be a rotary compressor, a reciprocating compressor, or other types of compressors, and can be applied to horizontally mounted compressors or, for example, automotive compressors.

[0017] FIG. 1 is a longitudinal sectional view of a scroll compressor according to the present embodiment. As shown in FIG. 1, the scroll compressor 100 is configured such that a compression mechanism unit 10 that compresses a refrigerant and an electric mechanism unit 20 that drives the compression mechanism unit 10 are arranged inside a hermetic container 1.

[0018] The hermetic container 1 is composed of a cylindrical body portion 1a extending vertically, a lower lid 1b closing a lower opening of the body portion 1a, and an upper lid 1c closing an upper opening of the body portion 1a. The hermetic container 1 is provided with a refrigerant suction pipe 2 that introduces refrigerant into the compression mechanism unit 10, a refrigerant discharge pipe 3 that discharges the refrigerant compressed by the compression mechanism unit 10 to the outside of the hermetic container 1, and an injection pipe 7 that injects intermediate-pressure refrigerant into the compression mechanism unit 10.

[0019] The compression mechanism unit 10 includes a fixed scroll 11, an orbiting scroll 12, and a rotating shaft 13 that orbitally drives the orbiting scroll 12. The orbiting scroll 12 is orbitally driven by the rotating shaft 13.

[0020] The electric mechanism unit 20 includes a stator 21 fixed to the hermetic container 1, and a rotor 22 arranged inside the stator 21. The rotating shaft 13 is fixed to the rotor 22. An eccentric shaft 13a eccentric with respect to the rotating shaft 13 is formed at an upper end of the rotating shaft 13.

[0021] Below the fixed scroll 11 and the orbiting scroll 12, a main bearing 30 that supports the fixed scroll 11 and the orbiting scroll 12 is provided. In the present embodiment, the main bearing 30 is a mechanical member fixed to the hermetic container 1 by welding from the outer peripheral surface of the hermetic container 1.

[0022] The main bearing 30 is configured with a bearing portion 31 that pivotally supports the rotating shaft 13, and a boss accommodating portion 32. The main bearing 30 is fixed to the hermetic container 1 by a welded portion 40. A lower end portion 13b of the rotating shaft 13 is pivotally supported by an auxiliary bearing 18 arranged at a lower portion of the hermetic container 1.

[0023] The fixed scroll 11 comprises a disc-shaped fixed scroll end plate 11a, a spiral-shaped fixed spiral wrap 11b erected from the fixed scroll end plate 11a, and an outer peripheral wall portion 11c erected to surround the fixed spiral wrap 11b. A discharge port 14 is formed approximately in the center of the fixed scroll end plate 11a.

[0024] The orbital scroll 12 comprises a disc-shaped orbital scroll end plate 12a, an orbital spiral wrap 12b erected from the wrap-side end face of the orbital scroll end plate 12a, and a cylindrical boss portion 12c formed on the non-wrap-side end face of the orbital scroll end plate 12a (the face opposite to the wrap-side end face of the orbital scroll end plate 12a). An Oldham ring 17 is positioned on the back surface of the orbital scroll end plate 12a to prevent the orbital scroll 12 from rotating.

[0025] The fixed spiral wrap 11b of the fixed scroll 11 and the spiral spiral wrap 12b of the spiral scroll 12 are interlocked with each other, and multiple compression chambers 15 are formed between the fixed spiral wrap 11b and the spiral spiral wrap 12b.

[0026] The boss portion 12c is formed approximately in the center of the orbiting scroll end plate 12a. The eccentric shaft 13a is inserted into the boss portion 12c, and the boss portion 12c is housed in the boss housing portion 32.

[0027] The fixed scroll 11 is fixed to the main bearing 30 using multiple bolts (not shown) on its outer peripheral wall portion 11c. On the other hand, the orbiting scroll 12 is supported by the fixed scroll 11 via an Oldham ring 17 that prevents the orbiting scroll 12 from rotating. The Oldham ring 17 that prevents the orbiting scroll 12 from rotating is provided between the fixed scroll 11 and the main bearing 30. As a result, the orbiting scroll 12 rotates relative to the fixed scroll 11 without rotating on its own axis.

[0028] A reservoir 4 for storing lubricating oil is formed at the bottom of the sealed container 1. A positive displacement refrigeration oil pump 5 is provided at the lower end of the rotating shaft 13. The refrigeration oil pump 5 is positioned so that its suction port is located inside the reservoir 4. The refrigeration oil pump 5 is driven by the rotating shaft 13 and reliably draws up the lubricating oil in the reservoir 4 at the bottom of the sealed container 1 regardless of pressure conditions or operating speed, thus eliminating concerns about running out of refrigeration oil.

[0029] The rotating shaft 13 has a rotating shaft refrigeration oil supply hole 13c that extends from the lower end 13b of the rotating shaft 13 to the eccentric shaft 13a.

[0030] The lubricating oil drawn up by the refrigeration oil pump 5 is supplied to the bearing, bearing portion 31, and boss portion 12c of the sub-bearing 18 through the rotating shaft refrigeration oil supply hole 13c formed in the rotating shaft 13.

[0031] The refrigerant drawn in from the refrigerant suction pipe 2 is guided from the suction port 15a to the compression chamber 15. The compression chamber 15 moves from the outer periphery towards the center, reducing its volume as it moves. When the refrigerant reaches a predetermined pressure in the compression chamber 15, it is discharged from the discharge port 14 located in the center of the fixed scroll 11 to the discharge chamber 6. The discharge port 14 is provided with a discharge reed valve (not shown). When the refrigerant reaches a predetermined pressure in the compression chamber 15, it pushes open the discharge reed valve, causing the refrigerant to be discharged into the discharge chamber 6. The refrigerant discharged into the discharge chamber 6 is led to the upper part of the sealed container 1 and discharged from the refrigerant discharge pipe 3.

[0032] In this embodiment, the compressor 100 includes a condenser 51, a pressure reducing device 52, a gas-liquid separator 53, and an evaporator 54, all connected in a ring shape by refrigerant piping 55. The condenser 51 condenses the refrigerant discharged from the refrigerant discharge pipe 3. The pressure reducing device 52 reduces the pressure of the refrigerant condensed in the condenser 51. The evaporator 54 evaporates the refrigerant reduced in pressure by the pressure reducing device 52. The refrigerant evaporated in the evaporator 54 is returned to the compression mechanism 10 by the refrigerant suction pipe 2. The gas-liquid separator 53 separates the gaseous refrigerant, which has been condensed in the condenser 51 and reduced in pressure in the pressure reducer 52, from the liquid refrigerant. The liquid refrigerant then passes through the pressure reducer 52 again and is led to the evaporator 54 as a low-pressure refrigerant. Meanwhile, the gaseous refrigerant separated in the gas-liquid separator 53 passes through the injection pipe 7 and is led to the compression chamber 15, which is in an intermediate pressure state.

[0033] Figure 2 shows the welded portion of the sealed container in Figure 1. Figure 2(a) is an unfolded view of the sealed container in the area H shown in Figure 1, and Figure 2(b) is an outer circumferential view of the sealed container from the V direction shown in Figure 1. Figure 2 shows the case where the welded joint 40 consists of three locations: the first welded joint 41, the second welded joint 42, and the third welded joint 43.

[0034] The second weld 42 is located at a distance of 1 H1 from the first weld 41, and the third weld 43 is located at a distance of 2 H2 from the first weld 41, with the 1 H1 and 2 H2 being different. In Figure 2, the second weld 42 is located at distances of 1 H1 and 2 H2 from the third weld 43. Furthermore, the distance from the first weld 41 to the second weld 42 is defined as the first circumferential distance L1, and the distance from the second weld 42 to the third weld 43 is defined as the second circumferential distance L2, making the first circumferential distance L1 and the second circumferential distance L2 different. Consequently, the third circumferential distance L3 from the third weld 43 to the first weld 41 is different from both the first circumferential distance L1 and the second circumferential distance L2.

[0035] Thus, when the mechanical component (main bearing 30) is welded to the sealed container 1 by multiple welds 40, all of the multiple welds 40 are made to be at different heights. By making all of the multiple welds 40 at different heights, residual stress and thermal distortion of the mechanical component (main bearing 30) can be suppressed, and a highly efficient and reliable scroll compressor 100 can be provided. In this embodiment, the axial direction of the rotating shaft 13 is described as the height of the welds 40, and in the case of a horizontally mounted compressor, the horizontal direction, which is the axial direction of the rotating shaft 13, corresponds to the height.

[0036] Furthermore, the circumferential distance L between adjacent welds 40 is made different for each. By making the circumferential distance L between adjacent welds 40 different in this way, residual stress and thermal distortion of the mechanical member (main bearing 30) can be further suppressed, and a highly efficient and reliable scroll compressor 100 can be provided.

[0037] Furthermore, by having three welded joints 40—a first welded joint 41, a second welded joint 42, and a third welded joint 43—the number of welds can be minimized, thermal deformation of the mechanical component (main bearing 30) can be further suppressed, and strength can be ensured.

[0038] Figure 3 is a longitudinal cross-sectional view of a rotary compressor according to another embodiment of the present invention. The sealed container 1 consists of a cylindrical body 1a extending vertically, a lower lid 1b that closes the lower opening of the body 1a, and an upper lid 1c that closes the upper opening of the body 1a. The sealed container 1 is connected to a refrigerant intake pipe 2 for drawing in refrigerant and a refrigerant discharge pipe 3 for discharging refrigerant. Inside the sealed container 1 are a compression mechanism 10 for compressing the refrigerant drawn in from the refrigerant intake pipe 2 and an electric mechanism 20 for driving the compression mechanism 10. The bottom of the sealed container 1 is an oil storage section 4.

[0039] The compression mechanism 10 consists of a cylinder 16a, a piston 16b, vanes (not shown), a main bearing 16c, and a secondary bearing 16d. The cylinder 16a is fixed to the sealed container 1 by a welded joint (not shown in Figure 3). The piston 16b is fitted to the eccentric shaft 13a of the rotating shaft 13 that penetrates the inside of the cylinder 16a so as to be able to rotate on its own. The vanes reciprocate in the vane grooves, following the piston 16b which rolls along the inner wall surface of the cylinder 16a. The main bearing 16c and secondary bearing 16d seal the upper and lower end surfaces of the cylinder 16a and support the rotating shaft 13.

[0040] The electric motor 20 consists of a stator 21 fixed to the sealed container 1 and a rotor 22 positioned on the inner circumference of the stator 21. The rotor 22 is fixed to the rotating shaft 13. The refrigerant is drawn in from the suction pipe 2 to the compression mechanism 10 and compressed in the compression mechanism 10. After that, the refrigerant passes through the electric mechanism 20 and is discharged from the refrigerant discharge pipe 3.

[0041] In this embodiment, the refrigeration system comprises a compressor 110, a condenser 51, a pressure reducing device 52, and an evaporator 54, all connected in a ring shape by refrigerant piping 55. The condenser 51 condenses the refrigerant discharged from the refrigerant discharge pipe 3, the pressure reducing device 52 reduces the pressure of the refrigerant condensed in the condenser 51, and the evaporator 54 evaporates the refrigerant reduced in pressure by the pressure reducing device 52. The refrigerant evaporated in the evaporator 54 is returned to the compressor 110 via the accumulator 56.

[0042] In this embodiment, the cylinder 16a is a mechanical component that is fixed to the sealed container 1 by welding from the outer surface of the sealed container 1. In the compressor 110 shown in Figure 3, the welded joint 40 of the sealed container 1 shown in Figure 2 can also be applied to the cylinder 16a as a mechanical component. Although the cylinder 16a has been described as being fixed to the sealed container 1, the main bearing 16c can also be a mechanical component fixed to the sealed container 1 by welding from the outer surface of the sealed container 1. In this case as well, the welded portion 40 of the sealed container 1 shown in Figure 2 can be applied to the main bearing 16c as a mechanical component.

[0043] In this way, by making the cylinder 16a or the main bearing 16c a mechanical component, residual stress and thermal distortion of the cylinder 16a or the main bearing 16c can be suppressed, enabling stable drive operation. However, the technology in this disclosure is not limited thereto and can be applied to embodiments that have been modified, replaced, added, or omitted. Furthermore, it is possible to create new embodiments by combining the components described in Embodiment 1 above. Although Figure 3 was used to explain the invention using a single-piston rotary compressor, it can also be applied to a two-piston rotary compressor. The mechanical components include, for example, in a scroll compressor, a fixed scroll 11, a main bearing 30, or a bearing section 31; in a rotary compressor, a cylinder 16a, a main bearing 16c, or a sub-bearing 16d; and in a two-piston rotary compressor, an intermediate plate positioned between the two cylinders to separate the two compression chambers. [Industrial applicability]

[0044] The compressor of the present invention is useful in equipment such as hot water heating systems, indoor air conditioning systems, vehicle-mounted air conditioning systems, water heaters, refrigerators, display cases, chillers, or refrigeration units. [Explanation of Symbols]

[0045] 1. Airtight container 1a Torso 1b Lower lid 1c top lid 2. Refrigerant intake pipe 3 Refrigerant discharge pipe 4 Oil storage section 5. Refrigeration oil pump 6 Discharge chamber 7 Injection tubes 10 Compression mechanism 11 Fixed Scroll 11a Fixed scroll end plate 11b Fixed spiral wrap 11c Outer wall 12 Rotating Scroll 12a Swivel scroll end plate 12b Swirling spiral wrap 12c Boss section 13 Rotation axis 13a Eccentric shaft 13b Bottom end 13c Rotating shaft refrigerator oil supply hole 14 Discharge Ports 15 Compression Chamber 15a Inhalation port 16a Cylinder (mechanical component) 16b Piston 16c main bearing 16d Sub-bearing 17 Oldham Ring 18 Sub-bearing 20 Electric mechanism section 21 status 22 rotors 30 Main bearing (mechanical component) 31 Bearing section 32 Boss Containment Unit 40 Welded section 41. First weld 42. Second weld 43 Third Weld 51 Condenser 52 Pressure Reducing Device 53 Gas-liquid separator 54 Evaporator 55 Refrigerant piping 56 Accumulator 100 Scroll Compressors 110 Compressor H1 1st distance H2 2nd distance L circumferential distance L1 1st circumferential distance L2 2nd circumferential distance L3 3rd circumferential distance

Claims

1. A compressor having a mechanical member inside a sealed container, which is fixed to the sealed container by welding from the outer surface of the sealed container, The mechanical member is welded to the sealed container by a plurality of welds, The multiple welded joints are all made to be at different heights. A compressor characterized by the following features.

2. The circumferential distances between adjacent welded joints were all made different. The compressor according to feature 1.

3. The welded portion is defined as the first welded portion, the second welded portion, and the third welded portion. The second weld is positioned at a distance of a first distance from the first weld, The third weld is positioned at a distance of two distances from the first weld, The first distance and the second distance are different The compressor according to feature 1.

4. The distance from the first weld to the second weld is defined as the first circumferential distance. The distance from the second weld to the third weld is defined as the second circumferential distance. The first circumferential distance and the second circumferential distance are different. The compressor according to claim 3.

5. The compression mechanism includes a fixed scroll, a rotating scroll, and a rotating shaft that rotates the rotating scroll. Below the fixed scroll and the orbiting scroll, a main bearing is provided to support the fixed scroll and the orbiting scroll. The main bearing is the mechanical component. The compressor according to feature 1.

6. The compression mechanism consists of at least a cylinder, a piston, vanes, a main bearing, and a secondary bearing. The cylinder or the main bearing is the mechanical component. The compressor according to feature 1.

7. A device using a compressor according to any one of claims 1 to 6, The compressor, condenser, pressure reducing device, and evaporator are connected in a ring shape by refrigerant piping. A device characterized by the following features.

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