Compressor and refrigeration cycle device

Abstract

To provide a compressor that can realize both weight reduction and reliability, and a refrigeration cycle device that comprises the compressor.SOLUTION: A compressor according to an embodiment comprises a rotating shaft, an electric motor part for rotating the rotating shaft, and a compression mechanism part for compressing a refrigerant in association with rotation of the rotating shaft. The compression mechanism part comprises a rotary element for rotating eccentrically with respect to a rotation center of the rotating shaft, and a fixed element for sliding on the rotary element, and forming a compression chamber for a refrigerant together with the rotary element. At least a portion of the fixed element is formed of a thermosetting resin material.SELECTED DRAWING: Figure 3

Description

[Technical Field]

[0001] An embodiment of the present invention relates to a compressor and a refrigeration cycle device. [Background technology]

[0002] Conventionally, the sliding components of a compressor during operation are made of metal. For example, in a rotary compressor, the cylinder, the bearings that support the rotating shaft, the rollers that rotate eccentrically inside the cylinder, and the vanes that slide on the outer surfaces of the rollers are mainly made of iron-based materials such as cast iron and high-speed tool steel.

[0003] In recent years, as in Patent Document 1, for example, it has been proposed to cast components such as rollers and vanes using Al-Si (aluminum-silicon) alloy castings to reduce their weight. However, the specific gravity of Al-Si alloy castings is generally around 2.6 to 3.0, and while they are lighter than conventional iron-based materials, further weight reduction is difficult. To achieve weight reduction, it is necessary to increase the amount of Si, which has a specific gravity of 1.0 or less. However, adding large amounts of Si increases the size of primary Si crystals, increasing their dispersion, resulting in reduced high-temperature strength due to stress concentration (see, for example, Patent Document 2). In practice, the maximum Si content is 19 wt%.

[0004] Furthermore, Patent Documents 3 and 4 disclose compressors that are lightweight by forming a part of the compression mechanism from a resin material such as PBT (polybutylene terephthalate) or PEEK (polyether ether ketone).

[0005] However, because the inside of a compressor becomes very hot during operation, there are concerns that the mechanical properties may deteriorate if thermoplastic resin materials such as PBT or PEEK are used. Furthermore, PBT and PEEK have a significantly higher coefficient of linear expansion than conventional iron-based metal materials. Therefore, in high-temperature environments, the linear expansion of resin materials can cause an increase in various clearances, leading to a decrease in compressor performance and even destruction of the compressor. [Prior art documents] [Patent documents]

[0006] [Patent Document 1] Patent No. 6028832 [Patent Document 2] Japanese Patent Application Publication No. 8-134578 [Patent Document 3] Japanese Patent Publication No. 2020-112065 [Patent Document 4] Japanese Patent Application Publication No. 2020-176569 Summary of the Invention [Problem to be solved by the invention]

[0007] The problem to be solved by the present invention is to provide a compressor that can achieve both light weight and reliability, and a refrigeration cycle apparatus including the compressor. [Means for solving the problem]

[0008] According to one embodiment, the compressor includes a rotating shaft, an electric motor that rotates the rotating shaft, and a compression mechanism that compresses a refrigerant as the rotating shaft rotates. The compression mechanism includes a rotating element that rotates eccentrically about the center of rotation of the rotating shaft, and a fixed element that slides against the rotating element and forms a refrigerant compression chamber together with the rotating element. The fixed element includes a cylinder that forms a cylinder chamber in which the rotating element is disposed, and a bearing that rotatably supports the rotating shaft. The bearing has a cylindrical portion made of a thermosetting resin material that supports the rotating shaft, and a flange portion provided at one end of the cylindrical portion. The flange portion has a resin portion that is integrally formed with the cylindrical portion using the resin material of the cylindrical portion, and a metal portion that is made of a metal material and overlaps with the resin portion of the flange portion in the axial direction of the rotating shaft.

[0009] The refrigeration cycle device of one embodiment includes the compressor, a condenser connected to the compressor, an expansion device connected to the condenser, and an evaporator connected to the expansion device. [Brief explanation of the drawings]

[0010] [Figure 1]FIG. 1 is a diagram showing a schematic configuration of a compressor and a refrigeration cycle device according to a first embodiment. [Figure 2] FIG. 2 is a schematic cross-sectional view of the compression mechanism according to the first embodiment. [Figure 3] FIG. 3 is a schematic cross-sectional view of the compression mechanism according to the first embodiment. [Figure 4] FIG. 4(a) is a schematic side view and FIG. 4(b) is a schematic plan view of the first partition plate according to the first embodiment. [Figure 5] FIG. 5(a) is a schematic side view and FIG. 5(b) is a schematic plan view of the first bearing according to the first embodiment. [Figure 6] Figure 6 shows an overview of the block-on-ring evaluation test conducted to evaluate the properties of the resin material. [Figure 7] Figure 7 is a graph showing the results of the block-on-ring evaluation test. [Figure 8] FIG. 8 is a graph showing the linear expansion coefficients of iron, phenolic resin, PEEK, and PBT. [Figure 9] FIG. 9 is a schematic cross-sectional view of a compression mechanism according to the second embodiment. [Figure 10] FIG. 10 is a schematic side view (a) and a plan view (b) of the first cylinder according to the second embodiment. [Figure 11] FIG. 11 is a schematic side view (a) and a plan view (b) of a first partition plate according to the second embodiment. [Figure 12] FIG. 12 is a schematic side view (a) and a schematic plan view (b) of the first bearing according to the second embodiment. [Figure 13] FIG. 13 is a schematic side view (a) and a plan view (b) of a first cylinder according to the third embodiment. [Figure 14] FIG. 14 is a diagram illustrating an example of a compression mechanism according to a modified example. DETAILED DESCRIPTION OF THE INVENTION

[0011] An embodiment will be described with reference to the drawings. In this embodiment, a rotary compressor, which is an example of a compressor, and a refrigeration cycle device including this compressor are disclosed. However, the configuration according to the present invention can be applied to other types of compressors. One example of the refrigeration cycle device is an air conditioner, but it may also be other types of devices.

[0012] [First embodiment] 1 is a diagram showing a schematic configuration of a compressor 1 and a refrigeration cycle apparatus 100 according to the first embodiment. The compressor 1 includes a compressor body 2, an accumulator 3, and a pair of suction pipes 4 connecting the compressor body 2 and the accumulator 3.

[0013] The refrigeration cycle apparatus 100 includes, in addition to the compressor 1, a first heat exchanger 101 (heat radiator), a second heat exchanger 102 (heat absorber), and an expansion device 103. The first heat exchanger 101 is connected to the discharge port of the compressor main body 2 by piping. The second heat exchanger 102 is connected to the accumulator 3 by piping. The expansion device 103 is connected to the first heat exchanger 101 and the second heat exchanger 102 by piping.

[0014] A refrigerant circulates in the refrigeration cycle of the refrigeration cycle apparatus 100 configured as described above. As this refrigerant, for example, R1234yf alone or a refrigerant containing R1234yf as a main component can be used, but is not limited to these examples. An example of a refrigerant containing R1234yf as a main component is a mixed refrigerant of R1234yf and R32. Note that the "main component" of a refrigerant refers to the component that is contained in the refrigerant in the largest amount by mass.

[0015] The refrigerant supplied to the compressor 1 is separated into gas and liquid in the accumulator 3, and the gas refrigerant is guided to the compressor body 2 via each suction pipe 4. The compressor body 2 compresses the gas refrigerant. The compressed high-pressure gas refrigerant is condensed in the first heat exchanger 101. The refrigerant is then decompressed in the expansion device 103, evaporated in the second heat exchanger 102, and supplied to the accumulator 3 again.

[0016] The configuration of the refrigeration cycle apparatus 100 is not limited to that shown in the drawing. For example, the refrigeration cycle apparatus 100 may further include a four-way valve that switches the supply destination of the refrigerant discharged from the compressor 1 between the first heat exchanger 101 and the second heat exchanger 102, and that switches the supply source of the refrigerant to the accumulator 3 between the first heat exchanger 101 and the second heat exchanger 102.

[0017] The compressor body 2 has a cylindrical sealed container 5. Refrigeration oil is stored in the lower part of the sealed container 5. Furthermore, the sealed container 5 houses an electric motor unit 6 located on the upper side and a compression mechanism unit 7 located on the lower side. The electric motor unit 6 and the compression mechanism unit 7 are connected via a rotary shaft 8.

[0018] The electric motor unit 6 includes a rotor 60 fixed to the rotating shaft 8 and a stator 61 surrounding the rotor 60. The rotor 60 is provided with a permanent magnet, and a coil is wound around the stator 61. The stator 61 is fixed to the sealed container 5. As the rotor 60 rotates, the rotating shaft 8 rotates about the center line AX. Hereinafter, the direction parallel to the center line AX will be referred to as the axial direction DX.

[0019] The compression mechanism 7 includes a first cylinder 11 and a second cylinder 12 aligned along the rotary shaft 8, and a partition plate 13 disposed between these cylinders 11, 12. The first cylinder 11 is located between the second cylinder 12 and the electric motor 6 in the axial direction DX. In the example of FIG. 1, the partition plate 13 is composed of a first partition plate 131 and a second partition plate 132 aligned in the axial direction DX. However, the partition plate 13 may be composed of a single continuous member.

[0020] A first bearing 14 (main bearing) that rotatably holds the rotary shaft 8 is fixed to the upper end surface of the first cylinder 11. A second bearing 15 (sub-bearing) that rotatably holds the rotary shaft 8 is fixed to the lower end surface of the second cylinder 12.

[0021] The rotating shaft 8 passes through the first cylinder 11, the second cylinder 12, and the partition plate 13. The rotating shaft 8 has a first eccentric portion 81 and a second eccentric portion 82 that are arranged with a phase difference of 180°. The first eccentric portion 81 is fitted into a cylindrical first roller 16. The second eccentric portion 82 is fitted into a cylindrical second roller 17.

[0022] A first cylinder chamber R1 is formed inside the first cylinder 11. The first cylinder chamber R1 corresponds to a space surrounded by the inner circumferential surface of the first cylinder 11, the lower surface of the first bearing 14, and the upper surface of the first partition plate 131. The first eccentric portion 81 and the first roller 16 are located in the first cylinder chamber R1.

[0023] A second cylinder chamber R2 is formed inside the second cylinder 12. The second cylinder chamber R2 corresponds to a space surrounded by the inner circumferential surface of the second cylinder 12, the upper surface of the second bearing 15, and the lower surface of the second partition plate 132. The second eccentric portion 82 and the second roller 17 are located in the second cylinder chamber R2.

[0024] When the rotary shaft 8 rotates, in the first cylinder chamber R1, the first roller 16 rotates eccentrically about the center line AX while the outer peripheral surface of the first roller 16 is in line contact with the inner peripheral surface of the first cylinder 11. Similarly, when the rotary shaft 8 rotates, in the second cylinder chamber R2, the second roller 17 rotates eccentrically about the center line AX while the outer peripheral surface of the second roller 17 is in line contact with the inner peripheral surface of the second cylinder 12.

[0025] The first bearing 14 is provided with a first discharge valve mechanism 18. For example, the first discharge valve mechanism 18 has a discharge port formed in the first bearing 14, a reed valve that opens and closes the discharge port, and a stopper that restricts the maximum opening of the reed valve. The first discharge valve mechanism 18 is covered by a first muffler 19 attached to the first bearing 14. The first muffler 19 has an opening that allows communication between the inside and outside of the first muffler 19.

[0026] The second bearing 15 is provided with a second discharge valve mechanism 20. For example, the second discharge valve mechanism 20 has a discharge port formed in the second bearing 15, a reed valve that opens and closes the discharge port, and a stopper that limits the maximum opening of the reed valve. The second discharge valve mechanism 20 is covered by a second muffler 21 attached to the second bearing 15. Although not shown in the cross section of FIG. 1 , the space within the second muffler 21 and the space within the first muffler 19 are in communication with each other through a refrigerant passage that passes through the second bearing 15, the second cylinder 12, the partition plate 13, the first cylinder 11, and the first bearing 14 in that order.

[0027] The first cylinder 11 and the second cylinder 12 are fixed to the sealed container 5. The first cylinder 11, the second cylinder 12, the partition plate 13, the first bearing 14, the second bearing 15, the first muffler 19, and the second muffler 21 are connected together, for example, by a plurality of long bolts BT (only one is shown in FIG. 1 ) that are connected in the axial direction DX.

[0028] The accumulator 3 has a case 30. The gas refrigerant vaporized in the second heat exchanger 102 flows into the case 30 through piping together with the liquid refrigerant. One end of each suction pipe 4 is located at the upper part of the case 30, and the gas refrigerant in the case 30 flows into the suction pipe 4 through these ends. The other end of each suction pipe 4 extends from the lower end side of the case 30 and is connected to the first cylinder 11 and the second cylinder 12, respectively.

[0029] 2 is a schematic cross-sectional view of the compression mechanism 7 at the position of the first cylinder 11. In the example shown in this figure, a vane slot 110 communicating with the first cylinder chamber R1 is formed in the first cylinder 11. The vane slot 110 extends in the radial direction of the first cylinder chamber R1.

[0030] A vane 22 is inserted into the vane slot 110 so as to be movable radially within the first cylinder chamber R1. The vane 22 is constantly biased toward the first cylinder chamber R1 by a biasing member 23, such as a coil spring. The vane 22 extends in the axial direction DX and has the cross-sectional shape shown in FIG. 2. A tip end surface SFa of the vane 22 is in slidable contact with the outer peripheral surface SFb of the first roller 16.

[0031] The first cylinder chamber R1 is divided into a suction chamber Ra and a compression chamber Rb by the vane 22. A suction passage 111 communicating with the suction chamber Ra is formed in the first cylinder 11. Gas refrigerant is supplied from the suction passage 111 through the suction pipe 4. When the rotary shaft 8 rotates, the volumes of the suction chamber Ra and the compression chamber Rb change in accordance with the eccentric rotation of the first eccentric portion 81 and the first roller 16. This causes the gas refrigerant to be compressed. The compressed gas refrigerant is discharged from the compression chamber Rb via the first discharge valve mechanism 18 into a space surrounded by the first muffler 19.

[0032] 2, a plurality of bolt holes H1 for passing the above-mentioned bolts BT are provided in the first cylinder 11. Although not shown in FIG. 2, the first cylinder 11 may also have communication holes that constitute the above-mentioned refrigerant passages that communicate the space within the second muffler 21 with the space within the first muffler 19.

[0033] The cross-sectional structure of the compression mechanism 7 at the position of the second cylinder 12 is the same as that shown in Fig. 2. That is, the second cylinder 12 is also provided with a vane slot 110 and a suction passage 111, and the vane 22 and the biasing member 23 are housed in the vane slot 110. Gas refrigerant drawn from the suction pipe 4 is supplied to the suction chamber Ra through the suction passage 111 and compressed in accordance with the eccentric rotation of the second eccentric portion 82 and the second roller 17. The compressed gas refrigerant is discharged from the compression chamber Rb via the second discharge valve mechanism 20 described above into the space surrounded by the second muffler 21.

[0034] Next, the configuration of the compression mechanism 7 according to this embodiment will be described in detail. 3 is a schematic cross-sectional view of the compression mechanism 7. In this figure, each element of the compression mechanism 7 is shown in schematic form, and discharge valve mechanisms 18, 20 and the like shown in FIG. 1 are omitted.

[0035] In this embodiment, the first eccentric portion 81 and the first roller 16 constitute a first rotating element PA1 that rotates eccentrically about the center line AX. Furthermore, the second eccentric portion 82 and the second roller 17 constitute a second rotating element PA2 that rotates eccentrically about the center line AX with a phase difference from the first rotating element PA1.

[0036] Additionally, first cylinder 11, second cylinder 12, partition plate 13, first bearing 14 and second bearing 15 together with rotating elements PA1 and PA2 constitute a fixed element PB that forms a compression chamber Rb for the refrigerant.

[0037] At least a portion of the fixed element PB is made of a thermosetting resin material. Specifically, in this embodiment, the first partition plate 131, the second partition plate 132, the first bearing 14, and the second bearing 15 are entirely made of a thermosetting resin material, and the first cylinder 11 and the second cylinder 12 are made of a metal material.

[0038] As will be described in detail later, it is preferable to use a phenolic resin containing reinforcing fibers as the thermosetting resin material. The reinforcing fibers are preferably glass fibers, but other reinforcing fibers such as carbon fibers can also be used.

[0039] Examples of metal materials that can be used to form the first cylinder 11 and the second cylinder 12 include martensitic stainless steel SUS440C, high-speed tool steel SKH51, and cast iron such as Ni-Cr-Mo (nickel, chromium, molybdenum)-based flake graphite cast iron, Monicro cast iron, gray cast iron such as FC250, and ductile cast iron such as FCD600. The vane 22 shown in FIG. 2 can also be formed from a similar metal material.

[0040] The rotating shaft 8 including the eccentric portions 81 and 82, the first roller 16, and the second roller 17 can be made of, for example, the same metal material as the first cylinder 11 and the second cylinder 12. However, at least a portion of the rotating elements PA1 and PA2, such as the rollers 16 and 17, may be made of a resin material.

[0041] 4A and 4B are a schematic side view and a plan view of the first partition plate 131. The first partition plate 131 has a circular planar shape and has an opening 131a in the center for passing the rotation shaft 8. Furthermore, a plurality of bolt holes H2 for passing the above-mentioned bolts BT are provided around the periphery of the opening 131a.

[0042] 4, the first partition plate 131 may also be formed with a communication hole that constitutes the above-mentioned refrigerant passage that connects the space in the second muffler 21 with the space in the first muffler 19. The second partition plate 132 has a similar configuration to the first partition plate 131.

[0043] 5A and 5B are a schematic side view and a schematic plan view of the first bearing 14. As shown in FIGS. 3 and 5, the first bearing 14 has a cylindrical portion 141 that supports the rotating shaft 8, and a flange portion 142 provided at one end of the cylindrical portion 141.

[0044] The flange portion 142 is in contact with the first cylinder 11 and the first roller 16. As shown in Fig. 5, the flange portion 142 is provided with a plurality of bolt holes H3 for passing the above-mentioned bolts BT therethrough. The cylindrical portion 141 and the flange portion 142 are both integrally formed from the above-mentioned resin material.

[0045] Although omitted in Figure 5, the flange portion 142 may also be formed with a discharge port of the first discharge valve mechanism 18 shown in Figure 1 and a communication hole that constitutes the above-mentioned refrigerant passage that connects the space within the second muffler 21 and the space within the first muffler 19.

[0046] The second bearing 15 has the same configuration as the first bearing 14. That is, as shown in Fig. 3, the second bearing 15 has a cylindrical portion 151 that supports the rotating shaft 8, and a flange portion 152 provided at one end of the cylindrical portion 151. The flange portion 152 has a plurality of bolt holes H2, similar to the flange portion 142. The cylindrical portion 151 and the flange portion 152 are both integrally formed from the above-mentioned resin material.

[0047] In the compression mechanism 7, surface treatment to increase hardness may be performed on surfaces that slide against other members, such as the tip surfaces SFa of the vanes 22, the outer peripheral surfaces SFb of the first roller 16 and the second roller 17, and the inner peripheral surfaces of the first cylinder 11 and the second cylinder 12. Examples of such surface treatments include DLC (diamond-like carbon) treatment, which forms a hard carbon film on a metal surface, and nitriding treatment.

[0048] Next, the resin material used for the partition plate 13 (131, 132), the first bearing 14, and the second bearing 15 will be considered. Figure 6 shows an overview of the block-on-ring evaluation test conducted to evaluate the properties of resin materials. In this block-on-ring evaluation test, a block material BL and a ring material RN were used. The ring material RN rotates around the axis AX0. Figure 6(a) is a plan view of the block material BL and the ring material RN viewed in a direction parallel to the axis AX0, and Figure 6(b) is a side view of the block material BL and the ring material RN.

[0049] During the evaluation test, a load W was applied from the back of the block material BL, and the sliding surface SF1 of the block material BL was pressed against the sliding surface SF2 (outer surface) of the ring material RN. This state was maintained for a predetermined time, and the amount of wear of the block material BL and the ring material RN was measured. During the test, the evaluation test machine in which the block material BL and the ring material RN were placed was filled with refrigerating machine oil and refrigerant and heated to an appropriate test temperature.

[0050] 7 is a graph showing the results of a block-on-ring evaluation test. The evaluation test was performed on samples SP1, SP2, SP3, and SP4 shown in FIG.

[0051] In samples SP1 and SP2, the block material BL and ring material RN are made of metal materials. Specifically, the block material BL of sample SP1 is made of SUS material that has been nitrided, and the block material BL of sample SP2 is made of iron-based material that has been DLC-treated. The ring materials RN of samples SP1 and SP2 are both made of iron-based material.

[0052] In samples SP3 and SP4, the block material BL is made of a metal material, and the ring material RN is made of a resin material. Specifically, the block material BL of sample SP3 is made of a SUS material that has been nitrided, and the block material BL of sample SP4 is made of an iron-based material that has been DLC-treated. The ring materials RN of samples SP3 and SP4 are both made of a phenolic resin containing glass fiber as a reinforcing fiber.

[0053] The wear amount of the block material BL and the ring material RN in sample SP3 is greater than that of samples SP1 and SP2, both of which are made of metal, whereas the wear amount of the block material BL and the ring material RN in sample SP4 is approximately equal to that of samples SP1 and SP2.

[0054] This shows that even when at least a part of the fixed element PB is made of phenolic resin, it is possible to obtain sliding characteristics equivalent to those of conventional compressors that do not use resin materials. Furthermore, it is also clear that even better sliding characteristics can be obtained when DLC treatment is applied to members that slide against members made of phenolic resin (for example, rollers 16 and 17 in this embodiment).

[0055] When the compressor 1 is operating, the temperature inside the sealed container 5 reaches a high temperature of at least 100°C or higher. The temperature of the surfaces of the components that slide against each other in the compression mechanism 7 further rises. If the resin material forming at least a part of the fixed element PB has a large linear expansion coefficient, the clearance between the components may change significantly during operation, which may result in a decrease in the performance of the compressor 1. Therefore, it is preferable that the resin material forming at least a part of the fixed element PB has a linear expansion coefficient equivalent to that of iron-based materials that have been used conventionally.

[0056] 8 is a graph showing the linear expansion coefficients of iron, phenolic resin, PEEK, and PBT. The linear expansion coefficients of thermoplastic resin materials such as PEEK and PBT are significantly larger than that of iron.

[0057] On the other hand, the linear expansion coefficient of phenolic resin containing glass fiber as a reinforcing fiber is significantly smaller than that of PEEK and PBT and can be considered to be substantially the same as that of iron. Therefore, phenolic resin containing reinforcing fiber is suitable as a resin material for forming at least a part of the fixing element PB.

[0058] Resin materials containing glass fibers have higher isotropy than resin materials containing other reinforcing fibers such as carbon fibers, etc. Considering these mechanical properties, it is preferable to use glass fibers as reinforcing fibers.

[0059] In the compressor 1 according to the present embodiment, some of the components constituting the fixed element PB are formed from a thermosetting resin material, thereby reducing the weight of the compression mechanism 7 and the entire compressor 1. The lightweight compressor 1 provides various advantages, such as more efficient installation and reduced carbon dioxide emissions during transportation.

[0060] Furthermore, thermosetting resin materials such as phenolic resin have a higher glass transition temperature than thermoplastic resin materials such as PEEK and PBT, and exhibit good mechanical properties even when the temperature inside the sealed container 5 becomes high. This ensures the reliability of the compressor 1 while realizing a lightweight design. As described above, the inclusion of reinforcing fibers in the resin material reduces the linear expansion coefficient of the member formed from the resin material, further improving the reliability of the compressor 1.

[0061] The thermal conductivity of resin material is significantly lower than that of metal material. Therefore, by forming a portion of the fixing element PB from a resin material, the thermal insulation of the first cylinder chamber R1 and the second cylinder chamber R2 can be improved, resulting in improved efficiency of the compressor 1.

[0062] In this embodiment, of the fixing element PB, the first cylinder 11 and the second cylinder 12 are formed of a metal material, which allows the first cylinder 11 and the second cylinder 12 to be securely fixed to the sealed container 5 by appropriate means such as welding. In addition to the above, various other advantageous effects can be obtained from this embodiment.

[0063] [Second embodiment] The second embodiment will be described. The configurations and effects of the compressor 1 and the refrigeration cycle device 100 that are not particularly mentioned are the same as those of the first embodiment.

[0064] 9 is a schematic cross-sectional view of the compression mechanism 7 according to this embodiment. In this figure, the elements of the compression mechanism 7 are shown in the same schematic manner as in FIG. 3, and discharge valve mechanisms 18, 20 and the like shown in FIG. 1 are omitted.

[0065] 10A and 10B are a schematic side view and a plan view of the first cylinder 11. As shown in FIGS. 9 and 10, the first cylinder 11 has a resin portion 11R made of a resin material and a metal portion 11M made of a metal material. The resin portion 11R and the metal portion 11M are, for example, integrally molded products, and are in close contact with each other with no gaps.

[0066] The resin portion 11R is cylindrical with an opening centered on the center line AX. The metal portion 11M has a cylindrical portion 112 that covers the inner circumferential surface of the resin portion 11R. Although not shown in FIG. 10, the metal portion 11M has an opening at a position corresponding to the suction passage 111. The first cylinder chamber R1 is formed inside the cylindrical portion 112. In the example of FIG. 10, the cylindrical portion 112 is sufficiently thinner than the resin portion 11R. This allows the weight of the first cylinder 11 to be reduced.

[0067] 9, the first eccentric portion 81 and the first roller 16 are disposed inside the metal portion 11M (cylindrical portion 112). When the compression mechanism 7 is driven, the first roller 16 and the metal portion 11M slide against each other.

[0068] As shown in Fig. 10, metal portion 11M has a pair of protrusions 113 that protrude from cylindrical portion 112 along vane slot 110. In this configuration, both side surfaces of vane slot 110 that slide against vane 22 are formed by metal portion 11M. In the example of Fig. 10, the tips of each protrusion 113 are spaced apart, but these tips may also be connected.

[0069] 9, the second cylinder 12 has a resin portion 12R made of a resin material and a metal portion 12M made of a metal material. The configurations of the resin portion 12R and the metal portion 12M are similar to those of the resin portion 11R and the metal portion 11M.

[0070] 11A and 11B are a schematic side view and a schematic plan view of the first partition plate 131. As shown in FIGS. 9 and 11, the first partition plate 131 has a resin portion 131R and a metal portion 131M. The resin portion 131R and the metal portion 131M are, for example, integrally molded products, and are in close contact with each other with no gaps.

[0071] The resin portion 131R and the metal portion 131M are both disk-shaped and overlap in the axial direction DX. In Fig. 11, the resin portion 131R and the metal portion 131M have the same thickness, but this is not limited to this example. The metal portion 131M contacts the first cylinder 11 and slides against the first roller 16 when the compression mechanism 7 is driven.

[0072] 11, resin portion 131R has a plurality of through holes 133. Metal portion 131M has a plurality of through holes 134 and cylindrical protrusions 135 protruding from the edges of these through holes 134. Each of protrusions 135 is fitted into through hole 133. This forms bolt hole H2 whose inner circumferential surface is covered with metal portion 131M.

[0073] 9, the second partition plate 132 has a resin portion 132R made of a resin material and a metal portion 132M made of a metal material. The configurations of the resin portion 132R and the metal portion 132M are similar to those of the resin portion 131R and the metal portion 131M. The first partition plate 131 and the second partition plate 132 are stacked such that the resin portions 131R and 132R are in contact with each other. The metal portion 132M is in contact with the second cylinder 12 and slides against the second roller 17 when the compression mechanism 7 is driven.

[0074] 12 is a schematic side view (a) and a schematic plan view (b) of the first bearing 14. As shown in Fig. 9 and Fig. 12, the first bearing 14 has a resin portion 14R and a metal portion 14M. The resin portion 14R and the metal portion 14M are, for example, integrally molded products, and are in close contact with each other with no gaps.

[0075] The resin portion 14R has a cylindrical portion 141 and a disk portion 142a provided at one end of the cylindrical portion 141. The metal portion 14M is disk-shaped and has the same diameter as the disk portion 142a. The disk portion 142a and the metal portion 14M are overlapped in the axial direction DX to form the flange portion 142. In FIG. 12, the disk portion 142a and the metal portion 14M have the same thickness, but this is not limited to this example. The metal portion 14M is in contact with the first cylinder 11 and slides against the first roller 16 when the compression mechanism 7 is driven.

[0076] 12, resin portion 14R has a plurality of through holes 143. Metal portion 14M has a plurality of through holes 144 and cylindrical protrusions 145 protruding from the edges of these through holes 144. Each of protrusions 145 is fitted into through hole 143. This forms bolt hole H3 whose inner circumferential surface is covered with metal portion 14M.

[0077] 9, the second bearing 15 has a resin portion 15R made of a resin material and a metal portion 15M made of a metal material. The configurations of the resin portion 15R and the metal portion 15M are similar to those of the resin portion 14R and the metal portion 14M. The metal portion 15M is in contact with the second cylinder 12 and slides against the second roller 17 when the compression mechanism 7 is driven.

[0078] In the above configuration, a thermosetting resin material can be used as the resin material for the resin portions 11R, 12R, 131R, 132R, 14R, and 15R. As in the first embodiment, it is preferable to use a phenolic resin containing reinforcing fibers such as glass fibers as the thermosetting resin material.

[0079] The metal material of metal portions 11M, 12M, 131M, 132M, 14M, and 15M may be, for example, SUS440C, SKH51, or cast iron such as monochromatic cast iron, gray cast iron, or ductile cast iron. Of these metal portions, at least the sliding surfaces with first roller 16 and second roller 17 are preferably subjected to a surface treatment such as DLC treatment or nitriding treatment.

[0080] Even when the first cylinder 11, the second cylinder 12, the partition plate 13, the first bearing 14, and the second bearing 15 are each made of a resin material and a metal material as in this embodiment, the weight of the compression mechanism 7 and the entire compressor 1 can be reduced compared to when all of these members are made of a metal material. Furthermore, by making part of each member from a metal material, the strength of each member can be increased.

[0081] The first roller 16 and the second roller 17 slide on the metal parts of the first cylinder 11, the second cylinder 12, the partition plate 13, the first bearing 14, and the second bearing 15. In this case, wear on the sliding surfaces can be suppressed compared to when the rollers 16 and 17 slide on resin parts.

[0082] In this embodiment, parts of the first cylinder 11 and the second cylinder 12, which are made of a metal material in the first embodiment, are made of a resin material, which further improves the thermal insulation of the first cylinder chamber R1 and the second cylinder chamber R2.

[0083] If the inner circumferential surface of bolt hole H2 is covered with metal portion 131M as shown in Fig. 11, wear and deformation of resin portion 131R due to bolt BT is suppressed. Similarly, if the inner circumferential surface of bolt hole H3 is covered with metal portion 14M as shown in Fig. 12, wear and deformation of resin portion 14R due to bolt BT is suppressed. The same applies to bolt hole H2 in second partition plate 132 and bolt hole H3 in second bearing 15.

[0084] [Third embodiment] The third embodiment will be described. The configurations and effects of the compressor 1 and the refrigeration cycle device 100 that are not particularly mentioned are the same as those of the second embodiment.

[0085] 13A and 13B are a schematic side view and a schematic plan view of the first cylinder 11 according to the present embodiment. As in the second embodiment, the first cylinder 11 has a resin portion 11R and a metal portion 11M.

[0086] In this embodiment, the metal portion 11M has a flat plate shape similar to the resin portion 11R. The metal portion 11M and the resin portion 11R overlap in the axial direction DX. For the sake of explanation, (a) in Figure 13 shows the resin portion 11R and the metal portion 11M separated from each other, but the resin portion 11R and the metal portion 11M are, for example, integrally molded products and are in close contact with each other without any gaps.

[0087] Resin portion 11R has a plurality of through holes 114. Metal portion 11M has a plurality of through holes 115 and cylindrical protrusions 116 protruding from the edges of these through holes 115. Protrusions 116 are fitted into through holes 114. This forms bolt holes H1 whose inner circumferential surfaces are covered with metal portion 11M.

[0088] In the example of FIG. 13, the inner circumferential surface of the cylinder chamber R1 and the side surface of the vane slot 110 are not covered with a metal material. As another example, similar to the second embodiment, the inner circumferential surface of the cylinder chamber R1 may be covered with a cylindrical portion 112 made of a metal material. Furthermore, the side surface of the vane slot 110 may be covered with a protruding portion 113 made of a metal material. In these cases, the cylindrical portion 112 and the protruding portion 113 may protrude from the disk-shaped metal portion 11M, similar to the protruding portion 116.

[0089] The first cylinder 11 may be disposed so that the resin portion 11R is in contact with the first bearing 14, or may be disposed so that the resin portion 11R is in contact with the first partition plate 131.

[0090] The same configuration as that of the first cylinder 11 can be applied to the second cylinder 12. In this case, the second cylinder 12 may be arranged so that the resin portion contacts the second bearing 15, or so that the resin portion contacts the second partition plate 132.

[0091] In the above first to third embodiments, the rotary compressor 1 is illustrated as having two cylinders 11 and 12. As another example, the compressor 1 may have only one cylinder or three or more cylinders.

[0092] Although each embodiment has been described with reference to the compressor 1 having the vanes 22, the configurations disclosed in each embodiment may also be applied to other types of compressors, such as a swing rotary compressor.

[0093] 14 is a diagram showing an example of a compression mechanism 200 provided in a swing rotary compressor. The compression mechanism 200 includes a cylinder 210 and a piston 220.

[0094] The cylinder 210 has a cylinder chamber Rm, a slot 211, and a refrigerant intake passage 212. An eccentric portion 230 of a rotary shaft driven by an electric motor is disposed in the cylinder chamber Rm.

[0095] The piston 220 has a cylindrical roller 221 in which the eccentric portion 230 is fitted, and a blade 222 that protrudes radially from the roller 221. The roller 221 and the blade 222 are integrally formed.

[0096] A pair of bushings 240 are disposed in the slot 211. The blade 222 is passed between these bushings 240 in the slot 211. The blade 222 divides the cylinder chamber Rm into a suction chamber Ra and a compression chamber Rb.

[0097] In the compression mechanism 200 configured as described above, the blade 222 moves forward and backward in the slot 211 in accordance with the eccentric rotation of the eccentric portion 230 and the roller 221, and the volumes of the suction chamber Ra and the compression chamber Rb change. This causes the gas refrigerant to be compressed. During this compression operation, the blade 222 slides against the bush 240.

[0098] Even when the configuration of the compression mechanism 200 replaces the configuration of the cylinders 11, 12 and the vanes 22 in each embodiment, the same effects as those of each embodiment can be obtained.

[0099] Although several embodiments of the present invention have been described, these embodiments are presented as examples and are not intended to limit the scope of the invention. These novel embodiments can be embodied in various other forms, and various omissions, substitutions, and modifications can be made without departing from the spirit of the invention. These embodiments and their modifications are included within the scope and spirit of the invention, and are also included in the scope of the invention and its equivalents as defined in the claims. [Explanation of symbols]

[0100] 1...compressor, 5...sealed vessel, 6...electric motor section, 7...compression mechanism section, 8...rotating shaft, 11, 12...cylinder, 13...partition plate, 14...first bearing, 15...second bearing, 16, 17...roller, 22...vane, 81, 82...eccentric section, 100...refrigeration cycle device, 101...first heat exchanger, 102...second heat exchanger, 103...expansion device, PA1, PA2...rotating element, PB...fixed element.

Claims

1. A compressor including a rotating shaft, an electric motor unit that rotates the rotating shaft, and a compression mechanism unit that compresses a refrigerant as the rotating shaft rotates, The compression mechanism portion includes: a rotating element that rotates eccentrically with respect to the rotation center of the rotation shaft; a fixed element that slides on the rotating element and forms a compression chamber for a refrigerant together with the rotating element; Equipped with The fixing element is a cylinder forming a cylinder chamber in which the rotating element is disposed; a bearing that rotatably supports the rotary shaft; Including, The bearing is a cylindrical portion formed of a thermosetting resin material and supporting the rotary shaft; a flange portion provided at one end of the cylindrical portion; and The flange portion is a resin portion integrally formed with the cylindrical portion using the resin material of the cylindrical portion; a metal portion formed of a metal material and overlapping the resin portion of the flange portion in the axial direction of the rotation shaft; having Compressor.

2. The resin material is a phenolic resin. The compressor according to claim 1 .

3. The resin material includes reinforcing fibers. The compressor according to claim 1 or 2.

4. The reinforcing fibers are glass fibers. The compressor according to claim 3.

5. The cylinder is a resin portion formed of a thermosetting resin material; a metal portion formed of a metal material; having A compressor according to any one of claims 1 to 4.

6. The resin portion of the cylinder has an opening through which the rotating shaft passes, the metal portion of the cylinder covers an inner circumferential surface of the resin portion of the cylinder; The compressor according to claim 5.

7. A compressor including a rotating shaft, an electric motor unit that rotates the rotating shaft, and a compression mechanism unit that compresses a refrigerant as the rotating shaft rotates, The compression mechanism portion includes: a rotating element that rotates eccentrically with respect to the rotation center of the rotation shaft; a fixed element that slides on the rotating element and forms a compression chamber for a refrigerant together with the rotating element; Equipped with the rotating elements include a first rotating element and a second rotating element that rotate with a phase difference; The fixing element is a first cylinder that defines a first cylinder chamber in which the first rotating element is disposed; a second cylinder that defines a second cylinder chamber in which the second rotating element is disposed; a partition plate disposed between the first cylinder and the second cylinder; Including, The partition plate is a resin portion formed of a thermosetting resin material; a metal portion formed of a metal material, overlapping the resin portion in the axial direction of the rotation shaft, and sliding on at least one of the first rotation element and the second rotation element; and the resin portion has a plurality of through holes, the metal portion has a plurality of through holes and a plurality of cylindrical protrusions protruding from edges of the plurality of through holes of the metal portion, the plurality of protrusions are fitted into the plurality of through holes of the resin portion; Compressor.

8. The fixed element further includes a bearing that rotatably supports the rotating shaft, The bearing is a cylindrical portion formed of a thermosetting resin material and supporting the rotary shaft; a flange portion provided at one end of the cylindrical portion; and The flange portion is a resin portion integrally formed with the cylindrical portion using the resin material of the cylindrical portion; a metal portion formed of a metal material and overlapping the resin portion of the flange portion in the axial direction of the rotation shaft; having The compressor according to claim 7.

9. A compressor according to any one of claims 1 to 8; a condenser connected to the compressor; an expansion device connected to the condenser; an evaporator connected to the expansion device; A refrigeration cycle device comprising:

Images