Compressor and air conditioner

Abstract

To provide a compressor capable of reducing noise caused by flexural vibration of a rotary shaft, and an air conditioner including the compressor.SOLUTION: The compressor includes cylinders, a rotary shaft, bearings, discharge valve mechanisms, and mufflers.The discharge valve mechanism has: a discharge valve being long in a predetermined direction, to be deformed and opened when refrigerant compressed by the cylinder reaches a predetermined discharge pressure; and a valve pressor for, when the discharge valve is opened, suppressing deformation from expanding any more. The discharge valve mechanism is arranged in a flange part of the bearing. The muffler covers the bearing so as to surround a space between the flange part and a boss part of the bearing to form a muffler chamber into which the refrigerant compressed by the cylinder is discharged. The muffler has a recessed part using an end face as a face on one end side in an axial direction of the rotary shaft, a flange as a face on the other end side in the axial direction of the rotary shaft, and a side face cylindrically linking the end face and the flange over the whole periphery in a peripheral direction of the rotary shaft for defining the outer shell of the muffler chamber while recessing the end face and the side face toward the inside of the muffler chamber.SELECTED DRAWING: Figure 2

Description

Technical Field

[0001] Embodiments of the present invention relate to a compressor and an air conditioner including the compressor.

Background Art

[0002] A refrigeration cycle apparatus such as an air conditioner includes a compressor that compresses a refrigerant. The compressor mainly includes, for example, an electric motor unit that rotates a rotating shaft, a compression mechanism unit that is connected to the electric motor unit via the rotating shaft, and a sealed container that houses the electric motor unit and the compression mechanism unit. The electric motor unit includes, for example, a so-called inner rotor type motor, and includes a rotor fixed to the rotating shaft and a stator fixed to the inner peripheral portion of the sealed container. The rotating shaft has a crank portion (eccentric portion). The compression mechanism unit includes, for example, a cylinder that forms a cylinder chamber, and a roller that is fitted to the eccentric portion of the rotating shaft and eccentrically rotates in the cylinder chamber. The inside of the cylinder chamber is partitioned by a vane into a refrigerant suction chamber and a compression chamber. The rotating shaft is rotatably supported by a bearing. The bearing has a flange portion that defines one surface in the axial direction of the rotating shaft in the cylinder chamber, and a boss portion that extends cylindrically from the flange portion. Further, a muffler that suppresses pulsation and noise caused by the refrigerant compressed by the cylinder of the compression mechanism unit and discharged into the sealed container is attached to the bearing.

Prior Art Documents

Patent Documents

[0003]

Patent Document 1

Patent Document 2

Patent Document 3

Summary of the Invention

Problems to be Solved by the Invention

[0004] The flange portion is equipped with a discharge port for discharging the refrigerant compressed by the cylinder into a sealed container, and a discharge valve mechanism for controlling the opening and closing of the discharge port. For this reason, the flange portion has a recess (recess) near the discharge port into which the discharge valve mechanism is assembled. The recess is formed by excavating one surface in the axial direction of the rotating shaft in the bearing, for example, the upper surface of the flange portion, to a predetermined depth. As a result, the recess is thinner than other parts of the flange portion, and its relative rigidity in the bearing tends to decrease. Therefore, when the rotating shaft rotates, the recess may elastically deform, for example, by tilting the boss portion relative to the flange portion. Depending on the degree of deformation of the recess, the rigidity of the bearing's support for the rotating shaft may decrease, and the rotating shaft may bend and vibrate, increasing noise. [Means for solving the problem]

[0005] A compressor according to one embodiment comprises a cylinder, a rotating shaft, a bearing, a discharge valve mechanism, and a muffler. The cylinder compresses a refrigerant. The rotating shaft has an eccentric portion disposed on the cylinder. The bearing has a flange portion that defines one axial surface of the rotating shaft in the cylinder, and a boss portion that extends cylindrically concentrically with the rotating shaft and is continuous with the flange portion, supporting the rotating shaft rotatably. The discharge valve mechanism has a discharge valve that deforms and opens when the refrigerant compressed in the cylinder reaches a predetermined discharge pressure and is longitudinal in a predetermined direction, and a valve retainer that suppresses further deformation when the discharge valve is open, and is disposed on the flange portion. The muffler covers the bearing so as to surround the space between the flange portion and the boss portion, and forms a muffler chamber between the flange portion and the boss portion through which the refrigerant compressed in the cylinder is discharged. The muffler has an end face portion which is the surface on one end in the axial direction of the rotating shaft, a flange portion which is the surface on the other end in the axial direction of the rotating shaft, and a side portion which connects the end face portion and the flange portion in a cylindrical shape over the entire circumference in the circumferential direction of the rotating shaft, and the muffler has recesses formed by recessing the end face portion and the side portion into the interior of the muffler chamber. [Brief explanation of the drawing]

[0006] [Figure 1] This is a schematic circuit diagram showing the configuration of an air conditioner according to the embodiment. [Figure 2] This is a longitudinal cross-sectional view of a compressor according to an embodiment. [Figure 3] This diagram schematically shows, from above, a bearing (a first bearing having a first discharge valve mechanism) of a compressor according to an embodiment. [Figure 4] This figure schematically shows a cross-section of the bearing (first bearing) at the point indicated by arrow A3 in Figure 3. [Figure 5] This diagram schematically shows, from above, the state in which the muffler (first muffler) of the compressor according to the embodiment is assembled to the bearing (first bearing). [Figure 6] This is a schematic perspective view showing the muffler (first muffler) of the compressor according to the embodiment. [Modes for carrying out the invention]

[0007] An embodiment will be described below with reference to Figures 1 to 6.

[0008] Figure 1 is a circuit diagram of the refrigeration cycle of the air conditioner 1 according to this embodiment. The air conditioner 1 is a device that performs air conditioning by such a refrigeration cycle, and is an example of a refrigeration cycle device. The air conditioner 1 mainly comprises a compressor 2, a four-way valve 3, an outdoor heat exchanger 4, an outdoor fan 40, an expansion device 5, an indoor heat exchanger 6, and an indoor fan 60.

[0009] As shown in Figure 1, the discharge side of the compressor 2 is connected to the first port 3a of the four-way valve 3. The second port 3b of the four-way valve 3 is connected to the outdoor heat exchanger 4. The outdoor heat exchanger 4 is connected to the indoor heat exchanger 6 via the expansion device 5. The indoor heat exchanger 6 is connected to the third port 3c of the four-way valve 3. The fourth port 3d of the four-way valve 3 is connected to the suction side of the compressor 2 via the accumulator 8.

[0010] The refrigerant circulates through a circulation circuit 7 from the discharge side of the compressor 2, via the outdoor heat exchanger 4, expansion device 5, indoor heat exchanger 6, and accumulator 8, to the suction side. As the refrigerant, a chlorine-free refrigerant is preferred, and applicable examples include R448A, R449A, R449B, R407G, R407H, R449C, R456A, R516A, R406B, R463A, R744, and HC-based refrigerants.

[0011] For example, when the air conditioner 1 operates in cooling mode, the four-way valve 3 switches so that the first port 3a communicates with the second port 3b, and the third port 3c communicates with the fourth port 3d. When the air conditioner 1 starts operating in cooling mode, the high-temperature, high-pressure gaseous refrigerant compressed by the compressor 2 is discharged into the circulation circuit 7. The discharged gaseous refrigerant is guided through the four-way valve 3 to the outdoor heat exchanger 4, which functions as a condenser (heat radiator).

[0012] The gaseous refrigerant introduced into the outdoor heat exchanger 4 condenses through heat exchange with the air (outside air) drawn in by the outdoor fan 40, changing into a high-pressure liquid-phase refrigerant. The high-pressure liquid-phase refrigerant is reduced in pressure as it passes through the expansion device 5, changing into a low-pressure gas-liquid two-phase refrigerant. The gas-liquid two-phase refrigerant is introduced into the indoor heat exchanger 6, which functions as an evaporator (heat absorber), and also exchanges heat with the air (inside air) drawn in by the indoor fan 60 as it passes through the indoor heat exchanger 6.

[0013] As a result, the two-phase gaseous refrigerant absorbs heat from the air and evaporates, changing into a low-temperature, low-pressure gaseous refrigerant. The air passing through the indoor heat exchanger 6 is cooled by the latent heat of vaporization of the liquid-phase refrigerant and sent as cool air to the areas that need air conditioning (cooling) by the indoor blower 60.

[0014] The low-temperature, low-pressure gaseous refrigerant that has passed through the indoor heat exchanger 6 is guided to the accumulator 8 via the four-way valve 3. If any liquid refrigerant that has not evaporated is mixed in with the refrigerant, it is separated into liquid and gaseous refrigerant here. The low-temperature, low-pressure gaseous refrigerant separated from the liquid refrigerant is drawn from the accumulator 8 to the compressor 2, where it is compressed again into high-temperature, high-pressure gaseous refrigerant and discharged into the circulation circuit 7.

[0015] On the other hand, when the air conditioner 1 operates in the heating mode, the four-way valve 3 switches so that the first port 3a communicates with the third port 3c and the second port 3b communicates with the fourth port 3d. When the operation of the air conditioner 1 is started in the heating mode, the high-temperature and high-pressure gaseous refrigerant discharged from the compressor 2 is guided to the indoor heat exchanger 6 via the four-way valve 3 and exchanges heat with the air passing through the indoor heat exchanger 6. In this case, the indoor heat exchanger 6 functions as a condenser.

[0016] As a result, the gaseous refrigerant passing through the indoor heat exchanger 6 condenses by exchanging heat with the air (indoor air) sucked by the indoor blower 60 and changes into a high-pressure liquid-phase refrigerant. The air passing through the indoor heat exchanger 6 is heated by the heat exchange with the gaseous refrigerant and is sent as warm air to the place to be air-conditioned (heated) by the indoor blower 60.

[0017] The high-temperature liquid-phase refrigerant that has passed through the indoor heat exchanger 6 is guided to the expansion device 5 and is depressurized in the process of passing through the expansion device 5 and changes into a low-pressure gas-liquid two-phase refrigerant. The gas-liquid two-phase refrigerant is guided to the outdoor heat exchanger 4 that functions as an evaporator and evaporates by exchanging heat with the air (outdoor air) sucked by the outdoor blower 40 and changes into a low-temperature and low-pressure gaseous refrigerant. The low-temperature and low-pressure gaseous refrigerant that has passed through the outdoor heat exchanger 4 is sucked into the compressor 2 via the four-way valve 3 and the accumulator 8 and is compressed again by the compressor 2 into a high-temperature and high-pressure gaseous refrigerant and discharged into the circulation circuit 7.

[0018] In addition, in this embodiment, the air conditioner 1 can be operated in either the cooling mode or the heating mode, but the air conditioner 1 may be, for example, a cooling-only machine or a heating-only machine that can be operated only in either the cooling mode or the heating mode.

[0019] Next, a specific configuration of the compressor 2 used in the air conditioner 1 will be described with reference to FIG. 2. FIG. 2 is a longitudinal sectional view of the compressor 2. As shown in FIG. 2, the compressor 2 is a so-called vertical rotary compressor (rotary compressor), and mainly includes a sealed container 10, a compression mechanism portion 11, and an electric motor portion 12. In the following description, based on the relative positional relationship between the compression mechanism portion 11 and the electric motor portion 12 arranged along the central axis O1 of the sealed container 10 described later, the side where the compression mechanism portion 11 is located is the lower side, and the side where the electric motor portion 12 is located is the upper side.

[0020] The sealed container 10 has a cylindrical peripheral wall 10a and stands upright perpendicular to the installation surface. The installation surface is, for example, the bottom plate of the outdoor unit. A discharge pipe 10b is provided at the upper end of the sealed container 10'. The discharge pipe 10b is connected to the first port 3a of the four-way valve 3 via the circulation circuit 7. An oil reservoir portion 10c for storing lubricating oil is provided at the lower part of the sealed container 10.

[0021] The compression mechanism portion 11 is housed in the lower part of the sealed container 10 so as to be immersed in the lubricating oil. In the example shown in FIG. 2, the compression mechanism portion 11 has a twin-type cylinder structure and mainly includes a first cylinder 13, a second cylinder 14, and a rotating shaft 15. The first cylinder 13 and the second cylinder 14 each have a roller (rolling piston) and a vane inside. Note that the number of cylinders of the compression mechanism portion is not limited to two, and may be one or three or more.

[0022] <9There is an error in the original text here. It should be "The first cylinder 13 is fixed to the inner peripheral surface of the peripheral wall 10a of the sealed container 10. The second cylinder 14 is fixed to the lower surface of the first cylinder 13 via a partition plate 18."

[0023] It should be noted that there seems to be an error in the original text at line . The corrected translation is provided above.A first bearing 20 is fixed above the first cylinder 13. The first bearing 20 covers the inner diameter of the first cylinder 13 from above and protrudes upward toward the first cylinder 13. The space enclosed by the inner diameter of the first cylinder 13, the partition plate 18, and the first bearing 20 constitutes the first cylinder chamber. The partition plate 18 corresponds to a closing member that defines the lower surface of the first cylinder chamber, and the first bearing 20 corresponds to a closing member that defines the upper surface of the first cylinder chamber.

[0024] A second bearing 22 is fixed below the second cylinder 14. The second bearing 22 covers the inner diameter of the second cylinder 14 from below and protrudes downward toward the second cylinder 14. The space enclosed by the inner diameter of the second cylinder 14, the partition plate 18, and the second bearing 22 constitutes the second cylinder chamber. The partition plate 18 corresponds to a closing member that defines the upper surface of the second cylinder chamber, and the second bearing 22 corresponds to a closing member that defines the lower surface of the second cylinder chamber. The first cylinder chamber and the second cylinder chamber are arranged concentrically with the central axis O1 of the sealed container 10.

[0025] The first cylinder chamber and the second cylinder chamber are connected to the accumulator 8 via a suction pipe (not shown), which is part of the circulation circuit 7. The gaseous refrigerant separated from the liquid phase refrigerant in the accumulator 8 is guided to the first and second cylinder chambers through this suction pipe.

[0026] The rotating shaft 15 has its axis coaxial with the central axis O1 of the sealed container 10 and penetrates the first cylinder chamber, the second cylinder chamber, and the partition plate 18. The rotating shaft 15 has a first journal portion 27a, a second journal portion 27b, and a pair of crankpin portions (eccentric portions) 28a, 28b. In other words, the rotating shaft 15 is configured as a crankshaft. The first journal portion 27a is rotatably supported by a first bearing 20. The second journal portion 27b is rotatably supported by a second bearing 22.

[0027] Furthermore, the rotating shaft 15 has an extension 27c that extends coaxially from the first journal portion 27a. The extension 27c passes through the first bearing 20 and protrudes above the compression mechanism portion 11. The rotor 33 of the electric motor portion 12, which will be described later, is fixed to the extension 27c.

[0028] The eccentric portions 28a and 28b are located between the first journal portion 27a and the second journal portion 27b. The eccentric portions 28a and 28b have, for example, a phase difference of 180 degrees, and their eccentricity with respect to the central axis O1 of the sealed container 10 is the same. One eccentric portion (hereinafter referred to as the first eccentric portion) 28a is housed in the first cylinder chamber. The other eccentric portion (hereinafter referred to as the second eccentric portion) 28b is housed in the second cylinder chamber.

[0029] Rollers 16 and 17 are fitted to the outer circumferential surfaces of the first eccentric portion 28a and the second eccentric portion 28b, respectively. A small gap is provided between the inner circumferential surfaces of rollers 16 and 17 and the outer circumferential surfaces of the eccentric portions 28a and 28b, allowing the rollers 16 and 17 to rotate relative to the eccentric portions 28a and 28b. As a result, when the rotating shaft 15 rotates, rollers 16 and 17 rotate eccentrically within the cylinder chamber, and a portion of the outer circumferential surfaces of rollers 16 and 17 contacts the inner circumferential surface of the cylinder chamber via an oil film.

[0030] The first cylinder 13 and the second cylinder 14 are each equipped with vanes (not shown). The vanes are supported by the cylinders 13 and 14, biased radially inward by a biasing mechanism. The tip of each vane is slidably pressed against the outer surface of rollers 16 and 17. These vanes work together with rollers 16 and 17 to divide the cylinder chambers of cylinders 13 and 14 into an intake chamber and a compression chamber, respectively, and move (advance and retreat) in a direction that protrudes into or retracts from the cylinder chamber as the rollers 16 and 17 rotate eccentrically. As the vanes advance and retreat relative to the cylinder chamber in this way, the volumes of the intake chamber and compression chamber of the cylinder chamber change, and the gaseous refrigerant drawn into the cylinder chamber from the suction pipe is compressed.

[0031] The high-temperature, high-pressure gaseous refrigerant compressed in the cylinder chambers of the first cylinder 13 and the second cylinder 14 is discharged into the sealed container 10 via the discharge valve mechanisms 21 and 23, which will be described later. The discharged gaseous refrigerant rises inside the sealed container 10. Furthermore, while the compression mechanism 11 is operating, the lubricating oil stored in the oil reservoir 10c of the sealed container 10 is agitated. The agitated lubricating oil becomes mist-like and rises inside the sealed container 10 towards the discharge pipe 10b, carried by the flow of the gaseous refrigerant. The sealed container 10 incorporates an oil separator and the like to separate the lubricating oil contained in the gaseous refrigerant rising inside.

[0032] The motor unit 12 is housed in the middle section of the sealed container 10 along the central axis O1, positioned between the compression mechanism 11 and the discharge pipe 10b. The motor unit 12 includes a so-called inner rotor type motor, comprising a rotor 33 fixed to a rotating shaft 15, and a stator 34 fixed to the inner surface of the peripheral wall 10a of the sealed container 10. When voltage is applied to the motor unit 12 from a power source, the rotor 33 rotates around the central axis O1 relative to the stator 34, and the rotating shaft 15 rotates together with the rotor 33. The rotating shaft 15 is rotatably supported by two bearings 20 and 22.

[0033] Of the two bearings 20 and 22, one is the main bearing (hereinafter referred to as the first bearing) 20, and the other is the secondary bearing (hereinafter referred to as the second bearing) 22. The first bearing 20 and the second bearing 22 each rotatably support the rotating shaft 15. The first bearing 20 defines the upper surface of the first cylinder chamber in the first cylinder 13, and the second bearing 22 defines the lower surface of the second cylinder chamber in the second cylinder 14. The upper surface is the end face of one end of the cylinders 13 and 14 in the axial direction of the rotating shaft 15 (along the central axis O1 of the sealed container 10), and the lower surface is the end face of the other end of the cylinders 13 and 14 in the same direction. In other words, the first bearing 20 corresponds to a member that closes the first cylinder chamber from above, and the second bearing 22 corresponds to a member that closes the second cylinder chamber from below.

[0034] The first bearing 20 has a first flange portion 20a that defines the upper surface of the first cylinder chamber in the first cylinder 13, and a first boss portion 20b that extends upward in a cylindrical shape, continuous with the first flange portion 20a.

[0035] The first flange portion 20a is located at the lower end of the first boss portion 20b, extends radially outward from the first boss portion 20b, and is continuous around the entire circumference in a circular shape concentric with the axis of the rotating shaft 15. The first flange portion 20a has a discharge hole (hereinafter referred to as the first discharge hole) 20c (see Figure 3) formed therein for discharging refrigerant from the compression chamber of the first cylinder 13. The first discharge hole 20c penetrates a part of the first flange portion 20a vertically and communicates with the compression chamber of the first cylinder 13. The first discharge hole 20c is opened and closed by a predetermined valve mechanism (hereinafter referred to as the first discharge valve mechanism) 21. The first discharge valve mechanism 21 is located on the first flange portion 20a and opens the first discharge hole 20c as the pressure in the compression chamber of the first cylinder 13 rises, discharging high-temperature, high-pressure gaseous refrigerant from the compression chamber.

[0036] The first boss portion 20b is the part of the first bearing 20 that rotatably supports the rotating shaft 15, specifically the first journal portion 27a, by inserting it through it. The first boss portion 20b is arranged concentrically with the rotating shaft 15. That is, the first boss portion 20b is arranged perpendicular to the first flange portion 20a. When the first journal portion 27a is inserted through the first boss portion 20b, its outer circumferential surface slides against the inner circumferential surface of the first boss portion 20b.

[0037] The second bearing 22 has a second flange portion 22a that defines the lower surface of the second cylinder chamber in the second cylinder 14, and a second boss portion 22b that extends downward in a cylindrical shape, continuous with the second flange portion 22a.

[0038] The second flange portion 22a is located at the upper end of the second boss portion 22b, extends radially outward from the second boss portion 22b, and is continuous around the entire circumference in a circular shape concentric with the axis of the rotating shaft 15. The second flange portion 22a has a discharge hole (not shown; hereinafter referred to as the second discharge hole) formed therein for discharging refrigerant from the compression chamber of the second cylinder 14. The second discharge hole penetrates a part of the second flange portion 22a vertically and communicates with the compression chamber of the second cylinder 14. The second discharge hole is opened and closed by a predetermined valve mechanism (hereinafter referred to as the second discharge valve mechanism) 23. The second discharge valve mechanism 23 opens the second discharge hole in response to an increase in pressure in the compression chamber of the second cylinder 14, and discharges high-temperature, high-pressure gaseous refrigerant from the compression chamber.

[0039] The second boss portion 22b is the part of the second bearing 22 that rotatably supports the rotating shaft 15, specifically the second journal portion 27b, by inserting it through it. The second boss portion 22b is arranged concentrically with the rotating shaft 15. That is, the second boss portion 22b is arranged perpendicular to the second flange portion 22a. When the second journal portion 27b is inserted through the second boss portion 22b, its outer circumferential surface slides against the inner circumferential surface of the second boss portion 22b.

[0040] Figures 3 and 4 show the configuration of the first discharge valve mechanism 21. Figure 3 is a schematic diagram showing the first bearing 20 having the first discharge valve mechanism 21 from above. Figure 4 is a schematic cross-sectional view showing the first bearing 20 at the point indicated by arrow A3 in Figure 3. The configurations of the first discharge valve mechanism 21 and the second discharge valve mechanism 23 are almost identical, except for the difference due to their inverted (up and down) positions. Therefore, the configuration of the second discharge valve mechanism 23 is similar to the configurations shown in Figures 3 and 4. For this reason, an example of the configuration of the first discharge valve mechanism 21 will be described below.

[0041] As shown in Figures 3 and 4, the first discharge valve mechanism 21 is provided on the first flange portion 20a of the first bearing 20 and appropriately opens the first discharge hole 20c to discharge the refrigerant compressed in the compression chamber of the first cylinder 13 from the compression chamber. The first discharge valve mechanism 21 comprises a discharge valve 21a and a valve retainer 21b. The discharge valve 21a and the valve retainer 21b are fixed to the first flange portion 20a with a predetermined fastener 21c. Any fastener such as a bolt, screw, or rivet can be used as the fastener 21c.

[0042] The first discharge hole 20c opens at the bottom of a recess (hereinafter referred to as the recessed portion) 20d formed in the first flange portion 20a. The recessed portion 20d is formed by recessing the upper surface (end face on one end side in the axial direction of the rotation shaft 15) 20e of the first flange portion 20a to a predetermined depth. The depth of the recessed portion 20d is approximately the same as the vertical dimension of the first discharge valve mechanism 21 (overlapping discharge valve 21a and valve retainer 21b). The contour of the recessed portion 20d as viewed from above the first flange portion 20a is a similar shape to the contour of the first discharge valve mechanism 21 as viewed from above, but slightly larger than the contour of the first discharge valve mechanism 21 as viewed from above, so that the first discharge valve mechanism 21 (discharge valve 21a and valve retainer 21b) can be assembled. In other words, the longitudinal direction of the recessed portion 20d is parallel to the longitudinal direction of the discharge valve 21a and valve retainer 21b, which will be described later. By making the recessed portion 20d in this form, when assembled to the recessed portion 20d, the first discharge valve mechanism 21 is retracted into the recessed portion 20d. In other words, the recessed portion 20d is formed in the first flange portion 20a as a recess for assembling the first discharge valve mechanism 21. Furthermore, the second flange portion 22a of the second bearing 22 has a recessed portion 22d (see Figure 2) similar to the recessed portion 20d, which is formed as a recess for assembling the second discharge valve mechanism 23.

[0043] The discharge valve 21a is a component for closing or opening the first discharge hole 20c, and is a plate-shaped component with a longitudinal direction. The discharge valve 21a is formed in a strip shape from an elastically deformable material such as spring steel. Thus, the discharge valve 21a has a cantilevered leaf spring structure in which one end in the longitudinal direction, fixed by a fastener 21c, is the fixed end, and the other end in the longitudinal direction is the free end, allowing it to bend and deform. Specifically, the discharge valve 21a deforms when the high-temperature, high-pressure gaseous refrigerant compressed in the compression chamber of the first cylinder 13 reaches a predetermined discharge pressure, opening the first discharge hole 20c. Hereinafter, this state of the discharge valve 21a will be referred to as the deformed state. In the state before the first discharge hole 20c is opened (hereinafter referred to as the normal state), the discharge valve 21a is pressed against the periphery of the first discharge hole 20c so as to close the first discharge hole 20c with an elastic force (pressure) smaller than the predetermined discharge pressure. Therefore, when the refrigerant pressure exceeds the atmospheric pressure inside the first muffler 41 and reaches a predetermined discharge pressure, the discharge valve 21a deforms against the elastic force (pressure) to open the first discharge hole 20c and discharge the refrigerant. After opening the first discharge hole 20c and discharging the refrigerant, when the refrigerant discharge pressure drops below the predetermined pressure, the discharge valve 21a elastically returns from its deformed state to its normal state and closes the first discharge hole 20c again.

[0044] The valve retainer 21b is a member for restricting the deformation of the discharge valve 21a, and is plate-shaped with a longitudinal direction and a thickness greater than that of the discharge valve 21a. The valve retainer 21b is made of, for example, steel. The valve retainer 21b is positioned so that its longitudinal direction is aligned with the longitudinal direction of the discharge valve 21a. These longitudinal directions intersect with the radial direction of the first flange portion 20a, in other words, with the plane containing the axis of the rotation axis 15. These longitudinal directions are also parallel to the longitudinal direction of the recessed portion 20d. In the example shown in Figure 3, these longitudinal directions are perpendicular to the radial direction of the first flange portion 20a, in other words, perpendicular to the plane containing the axis of the rotation axis 15. The valve retainer 21b is positioned to face the discharge valve 21a during the process in which the discharge valve 21a is displaced to a position away from the first discharge hole 20c when the first discharge hole 20c is opened. In the examples shown in Figures 3 and 4, the valve retainer 21b is positioned above the discharge valve 21a so as to overlap the discharge valve 21a. The valve retainer 21b has a curved shape so as to conform to the deformed state of the discharge valve 21a, which is bent (lifted up) to open the first discharge hole 20c. As a result, when the discharge valve 21a bends and deforms to open the first discharge hole 20c, that is, when it is in a deformed state, the valve retainer 21b comes into contact with the deformed discharge valve 21a and suppresses further deformation (lifting) of the discharge valve 21a.

[0045] Above the first bearing 20, a muffler (hereinafter referred to as the first muffler) 41 is provided to cover the first bearing 20. The first muffler 41 suppresses pulsation and noise caused, for example, by the refrigerant discharged from the compression chamber of the first cylinder 13 into the sealed container 10. The first muffler 41 covers the first bearing 20 so as to surround the space between the first flange portion 20a and the first boss portion 20b, and forms a first muffler chamber 43 between the first flange portion 20a and the first boss portion 20b. The first muffler chamber 43 is the space through which the high-temperature, high-pressure refrigerant compressed in the compression chamber of the first cylinder 13 is first discharged from the first discharge hole 20c. The first muffler 41 has a communication hole 41a that connects the inside and outside (top and bottom) of the first muffler 41. The high-temperature, high-pressure gaseous refrigerant discharged into the first muffler chamber 43 through the first discharge port 20c is discharged into the sealed container 10 through the communication port 41a.

[0046] As shown in Figure 2, below the second bearing 22, there is a muffler (hereinafter referred to as the second muffler) 42 that covers the second bearing 22. The second muffler 42 suppresses pulsation and noise caused, for example, by the refrigerant discharged from the compression chamber of the second cylinder 14 into the sealed container 10. The second muffler 42 covers the second bearing 22 so as to surround the space between the second flange portion 22a and the second boss portion 22b, forming a second muffler chamber 44 between the second flange portion 22a and the second boss portion 22b. The second muffler chamber 44 is the space through which the high-temperature, high-pressure refrigerant compressed in the compression chamber of the second cylinder 14 is first discharged from the second discharge hole. The second muffler chamber 44 communicates with the first muffler chamber 43 through a conduit hole provided in the compression mechanism 11. The conduit holes penetrate the second flange portion 22a, the second cylinder 14, the partition plate 18, the first cylinder 13, and the first flange portion 20a, respectively, and open to the second muffler chamber 44 and the first muffler chamber 43. The high-temperature, high-pressure gaseous refrigerant discharged into the second muffler chamber 44 through the second discharge hole reaches the first muffler chamber 43 through the conduit holes, and is then discharged into the sealed container 10 through the communication hole 41a.

[0047] Figures 5 and 6 show the configuration of the first muffler 41 according to this embodiment. Figure 5 is a schematic view from above showing the first muffler 41 assembled to the first bearing 20. Figure 6 is a schematic perspective view showing the first muffler 41.

[0048] As shown in Figures 4 to 6, the first muffler 41 is a three-dimensional element having three parts: an end face portion 45, a side portion 46, and a flange portion 47, all of which are thin-walled. The end face portion 45, the side portion 46, and the flange portion 47 define the outer casing of the first muffler chamber 43. The end face portion 45 is the surface of one end of the first muffler 41 in the axial direction of the rotation shaft 15 (along the central axis O1 of the sealed container 10), and is a surface that radiates outward from the axis of the rotation shaft 15. In the example shown in Figures 5 and 6, the end face portion 45 corresponds to the upper surface of the first muffler 41. The end face portion 45 is an annular shape having a circular opening 45a through which the first boss portion 20b of the first bearing 20 is inserted. The center of the opening 45a is located on the axis of the rotation shaft 15 (the central axis O1 of the sealed container 10). In other words, the first muffler 41 is positioned such that its opening 45a is concentric with the rotation axis 15. The diameter (through diameter) of the opening 45a is approximately the same as the outer diameter of the insertion portion of the first boss portion 20b.

[0049] The end face portion 45 has five side sections 45b to 45f that extend radially from the center of the opening 45a. The five side sections 45b to 45f are arranged at approximately equal intervals in the circumferential direction of the opening 45a. Except for the space between side sections 45b and 45f, the five side sections 45b to 45f are smoothly continuous with adjacent side sections, gradually approaching the center line of the opening 45a (the central axis O1 of the sealed container 10). Of these, four side sections 45b to 45e each have a communication hole 41a formed therein. Note that the number of side sections on the end face portion is not limited to five; it may be four or fewer, or six or more.

[0050] The side portion 46 connects the end portion 45 (specifically the five pieces 45b to 45f) and the flange portion 47 in a cylindrical shape over the entire circumference of the opening 45a, or in other words, the entire circumference of the axis of the rotating shaft 15. That is, the side portion 46 corresponds to the outer circumference of the first muffler 41. The side portion 46 is cylindrical, narrower on the side connected to the end portion 45 than on the side connected to the flange portion 47. In other words, the side portion 46 is inclined so that it approaches the center line of the opening 45a (the central axis O1 of the sealed container 10) as it moves from the side connected to the flange portion 47 towards the side connected to the end portion 45.

[0051] The flange portion 47 is the surface portion on the other end side of the first muffler 41 in the axial direction of the rotation axis 15 (along the central axis O1 of the sealed container 10), and is a surface portion that extends in a circular shape concentric with the axis of the rotation axis 15 and is substantially parallel to the end surface portion 45. In the example shown in Figures 5 and 6, the flange portion 47 corresponds to the lower surface portion of the first muffler 41 and is continuous with the side portion 46 at the lower end side of the first muffler 41. The flange portion 47 has through holes through which bolts are inserted. The bolts are an example of fasteners (in this embodiment, second fasteners for fixing the first muffler 41) for fixing the first muffler 41 to the first flange portion 20a. In the example shown in Figures 5 and 6, the flange portion 47 has five through holes 47a to 47e. Five bolts, 48a to 48e, are inserted through each of the through holes 47a to 47e, one bolt for each hole. These through holes 47a to 47e are arranged at approximately equal intervals in the circumferential direction of the opening 45a. Viewed from the axial direction of the rotation axis 15, the five through holes 47a to 47e are arranged so that one is positioned between adjacent pieces 45b to 45f on the end face portion 45. In other words, the five through holes 47a to 47e and the five pieces 45b to 45f are arranged so that they are positioned alternately with approximately the same phase difference in the circumferential direction of the opening 45a. Note that the number of through holes in the flange portion is not limited to five; it may be four or fewer, or six or more. For example, the number of through holes in the flange portion may match the number of pieces on the end face portion.

[0052] The through holes 47a to 47e each communicate with one through hole 20f to 20j formed in the first flange portion 20a of the first bearing 20. In the example shown in Figures 3 to 6, the first through hole 47a communicates with the first through hole 20f. Bolts 48a are inserted through these communicating through holes 47a and 20f. Similarly, the second through hole 47b communicates with the second through hole 20g. Bolts 48b are inserted through these communicating through holes 47b and 20g. The third through hole 47c communicates with the third through hole 20h. Bolts 48c are inserted through these communicating through holes 47c and 20h. The fourth through hole 47d communicates with the fourth through hole 20i. Bolts 48d are inserted through these communicating through holes 47d and 20i. The fifth through-hole 47e communicates with the fifth through-hole 20j. Bolts 48e are inserted through these communicating through-holes 47e and 20j. These bolts 48a to 48e are fastened to the first cylinder 13, respectively. In this way, the first muffler 41 and the first bearing 20 are assembled to the first cylinder 13. In other words, the flange portion 47 is fixed to the first cylinder 13 via the first flange portion 20a of the first bearing 20 using bolts 48a to 48e. That is, bolts 48a to 48e fix the flange portion 47 to the first cylinder 13 via the first flange portion 20a.

[0053] The first muffler 41 has a recess 49 formed by recessing the first muffler chamber 43 into the interior of the first muffler chamber 43, where the outer casing of the first muffler chamber 43 is defined. The configuration of the recess 49 will be described below with reference to Figures 4 to 6.

[0054] The recess 49 is formed by recessing the end face portion 45 and the side portion 46 into the interior of the first muffler chamber 43, respectively. When viewed from the first muffler chamber 43, the recess 49 is a protrusion that projects into the first muffler chamber 43 and corresponds to the rib of the first muffler 41. In other words, the recess 49 functions as a reinforcing part that suppresses deformation of the first muffler 41. In the example shown in Figures 4 to 6, the recess 49 is formed by recessing the portion between the piece 45b and piece 45f on the end face portion 45, and the portion connecting the space between the piece 45b and piece 45f on the side portion 46 and the flange portion 47, into the interior of the first muffler chamber 43.

[0055] When the recess 49 is projected onto the upper surface 20e of the first flange portion 20a from the axial direction of the rotating shaft 15, the recess 49 is positioned to intersect with the longitudinal direction of the recessed portion 20d and overlap with the recessed portion 20d. In other words, the recess 49 is positioned near the recessed portion 20d, or in other words, near the discharge valve 21a and the valve retainer 21b.

[0056] The recess 49 is composed of four surfaces 49a to 49d as its main surfaces. The first surface 49a and the second surface 49b face each other in a pair, substantially parallel to the circumferential direction of the opening 45a. Furthermore, the first surface 49a and the second surface 49b are parallel to a predetermined plane (virtual plane) that intersects the longitudinal direction of the discharge valve 21a, including the axis of the rotation shaft 15. In this embodiment, as an example, the first surface 49a and the second surface 49b are parallel to a plane that is perpendicular to the longitudinal direction of the discharge valve 21a, including the axis of the rotation shaft 15. Alternatively, if the recess 49 is projected onto the upper surface 20e of the first flange portion 20a from the axial direction of the rotating shaft 15, the first surface portion 49a and the second surface portion 49b are positioned to intersect, or rather orthogonally with, the longitudinal direction of the recessed portion 20d, and thus overlap with the recessed portion 20d, in other words, the discharge valve 21a and the valve retainer 21b.

[0057] The third surface portion 49c and the fourth surface portion 49d are continuous with each other and connect the first surface portion 49a and the second surface portion 49b. The first surface portion 49a and the second surface portion 49b are continuous via the third surface portion 49c and the fourth surface portion 49d. The third surface portion 49c stands upright, almost parallel to the center line of the opening 45a (the central axis O1 of the sealed container 10), and connects the first surface portion 49a and the second surface portion 49b above. The fourth surface portion 49d stands upright, inclined with respect to the center line of the opening 45a (the central axis O1 of the sealed container 10), and connects the first surface portion 49a and the second surface portion 49b below. The fourth surface 49d is inclined so that it approaches the centerline of the opening 45a (the central axis O1 of the sealed container 10) as it moves toward the side that is continuous with the third surface 49c (in this case, the upper side). The third surface 49c and the fourth surface 49d are continuous perpendicularly to the first surface 49a and the second surface 49b.

[0058] The third surface portion 49c has a through hole 49e through which a bolt 50 is inserted. The bolt 50 is an example of a fastener (in this embodiment, a first fastener for fixing the first muffler 41) to the first boss portion 20b, specifically the side portion 46. As shown in Figure 5, the first boss portion 20b is provided with a seating surface portion 20k having a flat seating surface that can contact the third surface portion 49c. The bolt 50 is fastened to a bolt hole 20l formed in the seating surface portion 20k. The first surface portion 49a and the second surface portion 49b are separated by a distance that does not interfere with the head 50a of the bolt 50.

[0059] Thus, the first muffler 41 is fixed to the first cylinder 13 via the first flange portion 20a by bolts 48a to 48e to the first bearing 20, and is also fixed to the first boss portion 20b by bolts 50. The first flange portion 20a is positioned to extend radially outward from the rotating shaft 15, and the first boss portion 20b is positioned concentrically with the rotating shaft 15. That is, the first flange portion 20a and the first boss portion 20b are positioned orthogonally to each other. Therefore, the first muffler 41 can be firmly fixed to the first bearing 20 from two directions: radially and axially from the rotating shaft 15. This makes it possible to increase the rigidity of the first muffler 41 against inclination of the first boss portion 20b when the rotating shaft 15 rotates, for example.

[0060] Furthermore, the first muffler 41 has a recess 49 located near the recessed portion 20d of the first flange portion 20a. As described above, the recess 49 functions as a reinforcing portion that suppresses deformation of the first muffler 41. Therefore, when the rotating shaft 15 rotates, the recess 49 can apply a force that would cause the recessed portion 20d to elastically deform, for example, by tilting the first boss portion 20b relative to the first flange portion 20a. As a result, the elastic deformation of the recessed portion 20d can be suppressed, and deformation that would cause the first boss portion 20b to tilt relative to the first flange portion 20a can be suppressed. As a result, it becomes possible to reduce noise caused, for example, by bending vibration of the rotating shaft 15.

[0061] Furthermore, the second muffler 42 does not have a portion corresponding to the recess 49 of the first muffler 41 described above. This is for the following reason. As shown in Figure 2, the second boss portion 22b of the second bearing 22 is shorter in the axial direction of the rotation shaft 15 than the first boss portion 20b of the first bearing 20. That is, the second boss portion 22b is less likely to deform in a way that causes it to tilt relative to the second flange portion 22a, and even if it does deform, it will not deform as much as the first boss portion 20b. Therefore, in this embodiment, the second muffler 42 is configured without the portion corresponding to the recess 49. In other words, the second muffler 42 can be configured in the same way as the first muffler 41, except for the fact that it does not have a portion corresponding to the recess 49 and the difference due to its upside down (vertical) position. However, the second muffler 42 may have a recess similar to that of the first muffler 41.

[0062] Although various embodiments of the present invention have been described above, these embodiments are presented as examples and are not intended to limit the scope of the invention. These novel embodiments can be implemented in a variety of other forms, and various omissions, substitutions, and modifications can be made without departing from the spirit of the invention. These embodiments and their variations are included in the scope and spirit of the invention, as well as in the claims of the invention and its equivalents. [Explanation of symbols]

[0063] 1...Air conditioner, 2...Compressor, 3...Four-way valve, 4...Outdoor heat exchanger, 5...Expansion device, 6...Indoor heat exchanger, 7...Circulation circuit, 8...Accumulator, 10...Sealed container, 11...Compression mechanism, 12...Electric motor, 13...First cylinder, 14...Second cylinder, 15...Rotating shaft, 18...Partition plate, 20...First bearing, 20a...First flange, 20b...First boss, 20c...First discharge hole, 20d...Recess (recessed part), 20e...Top surface, 20f~20j...Through hole, 20k...Seat surface, 20l...Bolt hole, 21...First discharge valve mechanism, 21a...Discharge valve, 21b...Valve retainer, 21c... Fixing device, 22... Second bearing, 22a... Second flange portion, 22b... Second boss portion, 23... Second discharge valve mechanism, 41... First muffler, 41a... Communication hole, 42... Second muffler, 43... First muffler chamber, 44... Second muffler chamber, 45... End face portion, 45a... Opening, 45b~45f... Side portion, 46... Side portion, 47... Flange portion, 47a~47e... Through hole, 48a~48e... Bolt, 49... Recess, 49a... First face portion, 49b... Second face portion, 49c... Third face portion, 49d... Fourth face portion, 49e... Through hole, 50... Bolt, 50a... Head, O1... Central axis of the sealed container.

Claims

1. a cylinder for compressing a refrigerant; a rotating shaft having an eccentric portion disposed in the cylinder; a bearing including a flange portion defining one surface of the cylinder in the axial direction of the rotary shaft, and a boss portion that is continuous with the flange portion, extends cylindrically concentric with the rotary shaft, and rotatably supports the rotary shaft; a discharge valve mechanism disposed on the flange portion, the discharge valve mechanism having a discharge valve elongated in a predetermined direction and deforming and opening when the refrigerant compressed in the cylinder reaches a predetermined discharge pressure, and a valve stopper that suppresses further deformation of the discharge valve when it opens; a muffler that covers the bearing so as to surround the area between the flange portion and the boss portion and forms a muffler chamber between the flange portion and the boss portion into which the refrigerant compressed in the cylinder is discharged, The muffler defines the outer contour of the muffler chamber by an end face portion which is a face portion on one end side in the axial direction of the rotary shaft, a flange portion which is a face portion on the other end side in the axial direction of the rotary shaft, and a side face portion which cylindrically connects the end face portion and the flange portion around the entire circumferential direction of the rotary shaft, and has recesses formed by recessing the end face portion and the side face portion into the interior of the muffler chamber. Compressor.

2. the flange portion has a recessed portion formed by recessing an end face on one end side in an axial direction of the rotary shaft, into which the discharge valve and the valve guard are assembled, The recess is disposed so as to intersect with the longitudinal direction of the discharge valve and overlap with the recessed portion when the recess is projected onto the flange portion from the axial direction of the rotary shaft. The compressor according to claim 1 .

3. the recess includes a first surface, a second surface, a third surface, and a fourth surface; the first surface portion and the second surface portion are parallel to a predetermined imaginary plane that includes an axis of the rotation shaft and intersects with a longitudinal direction of the discharge valve, The third surface portion and the fourth surface portion are continuous with each other, and the third surface portion connects the first surface portion and the second surface portion on one side in the axial direction of the rotating shaft, and the fourth surface portion connects the first surface portion and the second surface portion on the other side in the axial direction of the rotating shaft. The compressor according to claim 2 .

4. the third surface portion has a through hole through which a first fastener that fixes the muffler to the boss portion is inserted, The first surface portion and the second surface portion face each other at a distance that does not interfere with the first fixing tool. The compressor according to claim 3.

5. The flange portion has a plurality of through holes through which second fasteners are inserted to fasten the flange portion to the cylinder. A compressor according to any one of claims 1 to 4.

6. A compressor according to any one of claims 1 to 5; a condenser connected to the compressor; an expansion device connected to the condenser; an evaporator connected to the expansion device; Air conditioner.

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