Compressor, method for mounting discharge valve, and refrigeration cycle device

Abstract

To solve a problem that a valve guard is sometimes fixed in a state of floating from an end plate part by a fastening member.SOLUTION: A compressor 1 comprises a compression mechanism 80, a discharge valve 70, and a fastening member 74. The compression mechanism 80 has a front head 87. The front head 87 is formed with a fixing hole 75 and a discharge hole 71 at a distance from each other in a first direction D1. The discharge valve 70 includes a valve body 72 and a valve guard 73. The front head 87 is formed with a counterbore portion 88 between the discharge hole 71 and the fixing hole 75. Of the two ends of the counterbore portion 88 in the first direction D1, the first end 88a, which is positioned near the fixing hole 75, is positioned closer to the fixing hole 75 than the center 76 between the center 75a of the fixing hole 75 and the center 71a of the discharge hole 71. In the first direction D1, the center of gravity 73c of the valve guard 73 is positioned closer to the fixing hole 75 than the first end 88a of the counterbore portion 88.SELECTED DRAWING: Figure 4

Description

[Technical field]

[0001] The present invention relates to a compressor, a method for installing a discharge valve, and a refrigeration cycle device. [Background technology]

[0002] Conventionally, there has been known a compressor in which a discharge valve and a valve guard are arranged relative to a discharge hole of a compression mechanism, in which a countersunk portion is formed around the discharge hole, the discharge valve and the valve guard are arranged so as to overlap with the countersunk portion, and the compressor is fixed to the compression mechanism by fastening members.

[0003] For example, Patent Document 1 (Japanese Patent No. 4910440) discloses a compressor including a cylinder having a cylinder chamber, an end plate portion provided at the open end of the cylinder and having a discharge hole communicating with the cylinder chamber and a countersunk portion formed at a position adjacent to the discharge hole, a discharge valve that opens and closes the discharge hole and is positioned so as to partially overlap with the countersunk portion, a valve guard that sandwiches the discharge valve between the end plate portion, and a rivet as a fastening member that fixes the discharge valve and the valve guard to the end plate portion. Summary of the Invention [Problem to be solved by the invention]

[0004] When manufacturing a compressor such as that disclosed in Patent Document 1 (Patent Publication No. 4910440), when fixing the valve retainer to the compression mechanism, the flat portion of the valve retainer is placed on the end plate portion, and then the valve retainer is temporarily fixed to the end plate portion using a valve retainer fixing jig.

[0005] In this case, in the compressor described in Patent Document 1 (JP Patent Publication No. 4910440), when the flat surface of the valve guard is placed on the end plate and temporarily held by the valve guard fixing jig, the flat surface of the valve guard may be fixed by the fastening member in a floating state without being in close contact with the end plate. If the valve guard is attached to the end plate in such a state, the designed valve lift amount cannot be obtained, and problems such as reduced compressor performance and noise may occur. [Means for solving the problem]

[0006] A compressor according to a first aspect includes a compression mechanism, a discharge valve, and a fastening member. The compression mechanism includes a first member. The first member surrounds at least a portion of a compression chamber that compresses a refrigerant. The first member has a fixing hole and a discharge hole through which the refrigerant compressed in the compression chamber is discharged, the fixing hole and the discharge valve include a valve body and a valve guard. The valve body has a closing portion and a first fixing portion. The valve body extends with the first direction as a longitudinal direction. The valve body has a closing portion that closes the discharge hole at one end in the first direction, and has a first fixing portion that is fixed to the first member at the other end in the first direction. The valve guard sandwiches the valve body between the first member and the valve guard to limit deformation of the valve body. The fastening member fixes the discharge valve to the fixing hole of the first member. The first member has a countersunk portion between the discharge hole and the fixing hole in the first direction. The countersunk portion is recessed in a direction away from the valve body and extends along a first direction. A portion of the discharge valve is disposed so as to overlap with the countersunk portion. Of both ends of the countersunk portion in the first direction, a first end that is disposed near the fixing hole is disposed closer to the fixing hole than the center between the center of the fixing hole and the center of the discharge hole. In the first direction, the center of gravity of the valve guard is disposed closer to the fixing hole than the first end of the countersunk portion.

[0007] In the compressor of the first aspect, by positioning the center of gravity of the valve guard at a position closer to the fixing hole than the end (first end) of the countersunk portion on the fixing hole side, it is possible to suppress the occurrence of a malfunction in which the valve guard is fixed to the first member in a floating state above the first member.

[0008] A compressor of a second aspect is the compressor of the first aspect, wherein the first member has a first flat portion between the countersunk portion and the fixing hole in the first direction. The valve guard has a second flat portion and an inclined portion. The second flat portion sandwiches the valve body between the first flat portion of the first member. The inclined portion extends away from the first member in a direction perpendicular to the second flat portion as it approaches the discharge hole from the second flat portion in the first direction. The center of gravity of the valve guard is located at the second flat portion.

[0009] In the compressor of the second aspect, such a configuration makes it easy to bring the second flat portion into close contact with the valve body when the second flat portion of the valve guard is placed on the first flat portion so as to sandwich the valve body between the second flat portion and the first flat portion of the first member. Also, it is possible to prevent the second flat portion from being fixed to the first member in a state in which it is tilted relative to the first flat portion, thereby ensuring a predetermined valve lift amount.

[0010] A compressor according to a third aspect is the compressor according to the second aspect, wherein the average thickness of the second flat portion is greater than the average thickness of the inclined portion.

[0011] In the compressor of the third aspect, by making the thickness of the second flat surface portion of the valve guard large, the length of the second flat surface portion in the first direction can be reduced while the center of gravity of the valve guard is positioned at the second flat surface portion.

[0012] A compressor of a fourth aspect is the compressor of the second aspect or the third aspect, wherein, when the valve guard is viewed in a direction perpendicular to the second flat portion, an average width of the second flat portion in a second direction perpendicular to the first direction is larger than an average width of the inclined portion in the second direction.

[0013] In the compressor of the fourth aspect, by making the width of the second flat surface portion of the valve guard large, it is possible to position the center of gravity of the valve guard at the second flat surface portion while suppressing the length of the second flat surface portion in the first direction.

[0014] A compressor of a fifth aspect is the compressor of any one of the second aspect to the fourth aspect, wherein the inclined portion includes a second end portion that overlaps with the occluding portion when the valve guard is viewed from a direction perpendicular to the second flat portion. The inclined portion includes a connecting portion between the second end portion and the second flat portion. When the valve guard is viewed from a direction perpendicular to the second flat portion, the width of the connecting portion in a second direction orthogonal to the first direction is narrower than the width of the second end portion in the second direction.

[0015] In the compressor of the fifth aspect, by providing a narrow connecting portion at the inclined portion of the valve guard, it is possible to position the center of gravity of the valve guard at the second flat portion while reducing the length of the second flat portion in the first direction.

[0016] A sixth aspect of the present invention relates to a method for mounting a discharge valve in a compressor according to any one of the first to fifth aspects, and includes a first step, a second step, and a third step. In the first step, a valve body and a valve holder of the discharge valve are placed on a first member. In the second step, a valve holder fixing jig temporarily holds the valve holder of the discharge valve placed on the first member at a position closer to the fixing hole than a first end of the countersunk portion. In the third step, the discharge valve is fixed to the compression mechanism by a fastening member.

[0017] In the mounting method for the discharge valve according to the sixth aspect, by provisionally holding the discharge valve at the above-mentioned position, it is possible to suppress the occurrence of a problem in which the valve holder is fixed to the first member in a state where it is floating above the first member.

[0018] A refrigeration cycle device according to a seventh aspect includes the compressor according to any one of the first aspect to the fifth aspect. [Brief description of the drawings]

[0019] [Figure 1] 1 is a schematic configuration diagram of a refrigeration cycle device according to an embodiment of the present disclosure. [Diagram 2] FIG. 1 is a vertical cross-sectional view of a compressor according to an embodiment of the present disclosure. [Diagram 3] FIG. 3 is a plan view of a front head including a discharge valve of the compressor of FIG. 2. [Figure 4] 4 is a cross-sectional view of a front head including a discharge valve taken along the line IV-IV in FIG. 3. [Diagram 5] 3 is a side view of a valve guard of a discharge valve of the compressor of FIG. 2. [Figure 6] 4 is a flow chart of a method for mounting a discharge valve according to one embodiment of the present disclosure. [Figure 7] FIG. 2 is a cross-sectional view of a front head including a discharge valve according to an embodiment of the present disclosure when the discharge valve is installed. [Figure 8] 13 is a top view of the valve holder in Modification A and Modification B. FIG. [Figure 9] FIG. 13 is a cross-sectional view of a rear head including a discharge valve in modification D. DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS

[0020] (1) Overall configuration of the refrigeration cycle device A refrigeration cycle device 100 including a compressor 1 according to a first embodiment of the present disclosure will be described with reference to the drawings. As shown in FIG. 1, the refrigeration cycle device 100 is an air-conditioning device capable of cooling and heating the interior of a building or the like by performing a vapor compression refrigeration cycle. The refrigeration cycle device 100 mainly includes an outdoor unit 2, an indoor unit 3, a liquid refrigerant connection pipe 4, and a gas refrigerant connection pipe 5. The liquid refrigerant connection pipe 4 and the gas refrigerant connection pipe 5 connect the outdoor unit 2 and the indoor unit 3 to form a vapor compression refrigerant circuit 6. The refrigeration cycle device 100 is not limited to an air-conditioning device, and may be, for example, a refrigerator, a freezer, a water heater, a floor heating device, or the like.

[0021] (2) Detailed configuration of the refrigeration cycle device (2-1) Indoor unit The indoor unit 3 is installed indoors (in a living room, in the attic space, etc.) and constitutes a part of the refrigerant circuit 6. The indoor unit 3 mainly has an indoor heat exchanger 31. The indoor heat exchanger 31 functions as a refrigerant evaporator (heat absorber) to cool the indoor air during cooling operation, and functions as a refrigerant condenser (heat radiator) to heat the indoor air during heating operation. The liquid side of the indoor heat exchanger 31 is connected to the liquid refrigerant connection pipe 4. The gas side of the indoor heat exchanger 31 is connected to the gas refrigerant connection pipe 5.

[0022] (2-2) Outdoor unit The outdoor unit 2 is installed outdoors (on the roof of a building, near a wall of a building, etc.) and constitutes a part of the refrigerant circuit 6. The outdoor unit 2 mainly has a compressor 1, a four-way switching valve 22, an outdoor heat exchanger 23, an expansion valve 24, an accumulator 25, a liquid stop valve 26, and a gas stop valve 27.

[0023] The compressor 1 draws in and compresses a low-pressure gas refrigerant to produce a high-pressure gas refrigerant. The compressor 1 is driven by a compressor motor.

[0024] The four-way switching valve 22 switches the connection state of the internal piping of the outdoor unit 2. When the refrigeration cycle apparatus 100 performs cooling operation, the four-way switching valve 22 realizes the connection state shown by the dashed lines in Fig. 1. When the refrigeration cycle apparatus 100 performs heating operation, the four-way switching valve 22 realizes the connection state shown by the solid lines in Fig. 1.

[0025] The outdoor heat exchanger 23 exchanges heat between the refrigerant circulating in the refrigerant circuit 6 and the outdoor air. The outdoor heat exchanger 23 has a heat transfer tube through which the refrigerant flows and heat transfer fins attached to the heat transfer tube. The outdoor heat exchanger 23 functions as a refrigerant condenser (heat radiator) during cooling operation, and functions as a refrigerant evaporator (heat absorber) during heating operation.

[0026] The expansion valve 24 is an electrically operated valve whose opening degree can be adjusted. The expansion valve 24 reduces the pressure of the refrigerant flowing through the internal piping of the outdoor unit 2. The expansion valve 24 is disposed in the refrigerant circuit 6 between the outdoor heat exchanger 23 and the liquid stop valve 26, and controls the flow rate of the refrigerant.

[0027] The accumulator 25 is installed in the piping on the suction side of the compressor 1. The accumulator 25 separates the gas-liquid mixed refrigerant flowing through the refrigerant circuit 6 into gas refrigerant and liquid refrigerant, and stores the liquid refrigerant. The gas refrigerant separated in the accumulator 25 is sent to the suction port of the compressor 1.

[0028] The liquid stop valve 26 and the gas stop valve 27 are valves capable of blocking the refrigerant flow path. The liquid stop valve 26 is disposed in the refrigerant circuit 6 between the indoor heat exchanger 31 and the expansion valve 24. The gas stop valve 27 is disposed in the refrigerant circuit 6 between the indoor heat exchanger 31 and the four-way switching valve 22. The liquid stop valve 26 and the gas stop valve 27 are opened and closed by an operator, for example, when installing the refrigeration cycle apparatus 100. When the refrigeration cycle apparatus 100 is operating, the liquid stop valve 26 and the gas stop valve 27 are opened.

[0029] The control unit 28 is a computer that controls the components of the refrigeration cycle apparatus 100. The control unit 28 mainly includes an arithmetic unit and a storage device. The arithmetic unit is a processor such as a CPU. The storage device is a storage medium such as a RAM, a ROM, or a flash memory. The arithmetic unit reads out a program stored in the storage device and performs predetermined arithmetic processing in accordance with the program. The arithmetic unit writes arithmetic results to the storage device and reads out information stored in the storage device in accordance with the program.

[0030] (2-3) Refrigerant connection pipe The liquid refrigerant connection pipe 4 and the gas refrigerant connection pipe 5 are refrigerant piping that is installed on-site when the refrigeration cycle apparatus 100 including the refrigerant circuit 6 is installed at the installation location such as a building. The length and pipe diameter of the liquid refrigerant connection pipe 4 and the gas refrigerant connection pipe 5 are determined according to the installation conditions such as the installation location of the refrigeration cycle apparatus 100 and the combination of the outdoor unit 2 and the indoor unit 3. The refrigerant flowing through the liquid refrigerant connection pipe 4 may be liquid or may be in a gas-liquid two-phase state.

[0031] (2-4) Operation of the refrigeration cycle device The operation of the refrigeration cycle apparatus 100 during cooling operation and heating operation will be described with reference to FIG.

[0032] (2-4-1) Heating operation When the refrigeration cycle device 100 performs heating operation, the four-way switching valve 22 is switched to the state shown by the solid line in FIG. 1. In the refrigerant circuit 6, the low-pressure gas refrigerant of the refrigeration cycle is sucked into the compressor 1, compressed to the high pressure of the refrigeration cycle, and then discharged. The high-pressure gas refrigerant discharged from the compressor 1 is sent to the indoor heat exchanger 31 through the four-way switching valve 22, the gas stop valve 27, and the gas refrigerant communication pipe 5. The high-pressure gas refrigerant sent to the indoor heat exchanger 31 exchanges heat with the indoor air in the indoor heat exchanger 31 and condenses to become a high-pressure liquid refrigerant. This heats the indoor air. The liquid refrigerant condensed in the indoor heat exchanger 31 is sent to the expansion valve 24 through the liquid refrigerant communication pipe 4 and the liquid stop valve 26. The refrigerant sent to the expansion valve 24 is reduced in pressure to the low pressure of the refrigeration cycle by the expansion valve 24. The low-pressure refrigerant reduced in pressure by the expansion valve 24 is sent to the outdoor heat exchanger 23. The low-pressure refrigerant sent to the outdoor heat exchanger 23 exchanges heat with the outdoor air in the outdoor heat exchanger 23 and evaporates to become a low-pressure gas refrigerant. The low-pressure refrigerant evaporated in the outdoor heat exchanger 23 passes through the four-way switching valve 22 and the accumulator 25 and is sucked into the compressor 1 again.

[0033] (2-4-2) Cooling operation When the refrigeration cycle device 100 performs cooling operation, the four-way switching valve 22 is switched to the state shown by the broken line in FIG. 1. In the refrigerant circuit 6, low-pressure gas refrigerant of the refrigeration cycle is sucked into the compressor 1, compressed to the high pressure of the refrigeration cycle, and then discharged. The high-pressure gas refrigerant discharged from the compressor 1 is sent to the outdoor heat exchanger 23 through the four-way switching valve 22. The high-pressure gas refrigerant sent to the outdoor heat exchanger 23 exchanges heat with the outdoor air in the outdoor heat exchanger 23 and condenses to become a high-pressure liquid refrigerant. The liquid refrigerant condensed in the outdoor heat exchanger 23 is reduced in pressure to the low pressure of the refrigeration cycle by the expansion valve 24. The low-pressure refrigerant reduced in pressure by the expansion valve 24 is sent to the indoor heat exchanger 31 through the liquid stop valve 26 and the liquid refrigerant communication pipe 4. The refrigerant sent to the indoor heat exchanger 31 exchanges heat with the indoor air in the indoor heat exchanger 31 and evaporates to become a low-pressure gas refrigerant. The gas refrigerant evaporated in the indoor heat exchanger 31 passes through the gas refrigerant communication pipe 5, the gas shutoff valve 27, the four-way switching valve 22, and the accumulator 25, and is sucked into the compressor 1 again.

[0034] (3) Compressor (3-1) Compressor configuration 2, the compressor 1 here is a rotary type compressor that compresses the refrigerant to a predetermined pressure by eccentrically rotating a piston 81 inside a cylinder 84 to change the volume of the space inside the cylinder 84. The compressor 1 mainly includes a casing 10, a compression mechanism 80, a drive motor 16, a rotating shaft 17, a suction pipe 19, and a discharge pipe 20.

[0035] (3-1-1) Casing The casing 10 is composed of a cylindrical body 11, a bowl-shaped top 12, and a bowl-shaped bottom 13. The top 12 is airtightly connected to the upper end of the body 11. The bottom 13 is airtightly connected to the lower end of the body 11.

[0036] The casing 10 is formed from a rigid member. The casing 10 is installed so that the axial direction of the cylindrical body 11 is aligned vertically. An oil reservoir 10a for storing refrigeration oil is provided in the lower part of the internal space of the casing 10. The refrigeration oil in the oil reservoir 10a is supplied to various sliding parts of the compressor 1 by differential pressure or the like. The refrigeration oil is used to improve the lubricity of the various sliding parts of the compressor 1.

[0037] The casing 10 mainly accommodates the compression mechanism 80, the drive motor 16, and the rotating shaft 17.

[0038] A suction pipe 19 and a discharge pipe 20 are attached to the casing 10. The suction pipe 19 and the discharge pipe 20 are airtightly connected to the casing 10 so as to pass through the casing 10.

[0039] (3-1-2) Compression mechanism 2 and 3, the compression mechanism 80 is mainly composed of a front head 87, a cylinder 84, a rear head 85, a piston 81, and a muffler 83. The front head 87, the cylinder 84, and the rear head 85 are integrally fastened together by bolts or the like (not shown). The refrigerant compressed in the compression chamber 40 of the compression mechanism 80 and discharged into the space surrounded by the muffler 83 passes through the space surrounded by the muffler 83 and is discharged into the high pressure space HS around the compression mechanism 80. Next, each component of the compression mechanism 80 will be described.

[0040] (3-1-2-1) Cylinder The cylinder 84, together with the front head 87 and rear head 85 arranged above and below, and the piston 81 housed inside, forms the compression chamber 40 that compresses the refrigerant. The cylinder 84 is a substantially disk-shaped metal cast member. The cylinder 84 is located between the front head 87 and the rear head 85. In other words, a first cylinder end face 84a, which is the upper end face of the cylinder 84, contacts the lower surface of the front head 87. A second cylinder end face 84b, which is the lower end face of the cylinder 84, contacts the upper surface of the rear head 85.

[0041] The cylinder 84 is formed with a suction hole 84c for drawing in low-pressure refrigerant in the refrigeration cycle, and a cylinder hole 84d.

[0042] An end portion of a suction pipe 19 attached to the casing 10, which is located inside the casing 10, is fitted into a suction hole 84c of the cylinder 84. The suction hole 84c communicates with a cylinder hole 84d of the cylinder 84. A low-pressure refrigerant in the refrigeration cycle is supplied via the suction pipe 19 to a compression chamber 40 (particularly a low-pressure chamber 40a described later) formed by the cylinder hole 84d.

[0043] The cylinder hole 84d has open upper and lower ends. The upper opening of the cylinder hole 84d is closed by a front head 87, and the lower opening of the cylinder hole 84d is closed by a rear head 85. A piston 81 is disposed in the cylinder hole 84d, and the compression chamber 40 is formed by being surrounded by the front head 87 and the rear head 85. The refrigerant sucked from the suction hole 84c flows into the compression chamber 40.

[0044] (3-1-2-2) Piston The piston 81 is a substantially cylindrical member disposed in a cylinder hole 84d of the cylinder 84. An upper end face of the piston 81 contacts the lower surface of the front head 87. A lower end face of the piston 81 contacts the upper surface of the rear head 85.

[0045] The piston 81 is housed in the compression chamber 40 in a state where it is fitted onto the eccentric shaft portion 17a of the rotating shaft 17. The rotating shaft 17 rotates about an axis 17g. The eccentric shaft portion 17a rotates eccentrically about the axis 17g of the rotating shaft 17. The piston 81 rotates eccentrically in the cylinder 84 in conjunction with the axial rotation of the rotating shaft 17.

[0046] (3-1-2-3) Front Head The front head 87 is a member that covers the first cylinder end surface 84a of the cylinder 84 and surrounds a portion of the compression chamber 40. The front head 87 is fastened to the casing 10 by bolts or the like.

[0047] 2 and 3, the front head 87 has a front head disc portion 87a that closes the upper surface of the cylinder 84, and a front head boss portion 87b that extends upward (in the direction away from the cylinder 84) from approximately the center of the front head disc portion 87a. The front head boss portion 87b has a cylindrical shape, and the rotating shaft 17 is inserted into its hollow portion. The front head boss portion 87b functions as a bearing for the rotating shaft 17. A muffler 83 is attached to the front head 87 so as to cover an upper portion of the front head 87. The muffler 83 reduces noise caused by pressure pulsation of the high-pressure gas refrigerant discharged from the discharge hole 71.

[0048] 3, a fixing hole 75 and a discharge hole 71 are formed at a distance from each other in a front head disk portion 87a of a front head 87 as an example of a first member. The discharge hole 71 is a hole through which the refrigerant compressed in the compression chamber 40 is discharged. The fixing hole 75 is a hole to which a discharge valve 70 for closing the discharge hole 71 is fixed. Here, the direction in which the fixing hole 75 and the discharge hole 71 are arranged side by side is referred to as a first direction D1.

[0049] 4, the front head disk portion 87a of the front head 87 has a countersunk portion 88 and a first flat portion 82 between the fixing hole 75 and the discharge hole 71 in the first direction D1. The first flat portion 82 is disposed between the countersunk portion 88 and the fixing hole 75.

[0050] The countersunk portion 88 is disposed between the discharge hole 71 and the fixing hole 75 in the first direction D1, and is a recess that is recessed in a direction away from the valve body 72 (the valve body 72 of the discharge valve 70 that closes the discharge hole 71) described in detail later, and extends along the first direction D1. The countersunk portion 88 has a function of suppressing the valve body 72 from running over wear powder and the like generated by wear of the sliding members in the compressor 1. In addition, the countersunk portion 88 has a function of reducing oil resistance when the valve body 72 closes (preventing a delay in closing the valve body 72), and a function of preventing adhesion due to oil viscosity when the valve body 72 opens (preventing a delay in opening the valve body 72).

[0051] A first end 88a, which is an end of the countersunk portion 88 on the fixing hole 75 side in the first direction D1, is disposed closer to the fixing hole 75 than a center 76 between the center 75a of the fixing hole 75 and the center 71a of the discharge hole 71. Specifically, it is preferable that the first end 88a of the countersunk portion 88 is disposed at a position that is 20% or more and less than 50%, assuming that the position of the center 76 between the center 75a of the fixing hole 75 and the center 71a of the discharge hole 71 is 0% and the position of the center 75a of the fixing hole 75 is 100%. With this configuration, the front head 87 can ensure the function of the countersunk portion 88 while providing the first flat portion 82 with an area sufficient to temporarily hold the valve body 72 and the valve guard 73 of the discharge valve 70 placed on the front head 87.

[0052] The discharge hole 71 is a cylindrical hole that penetrates the front head disk portion 87a in the vertical direction. The discharge hole 71 communicates with the compression chamber 40 (high pressure chamber 40b of the compression chamber 40 described later) at its vertical lower side. The discharge hole 71 communicates with a space surrounded by the muffler 83 (referred to as a muffler space) at its vertical upper side. The discharge hole 71 is a flow path for sending the refrigerant compressed by the compression mechanism 80 from the high pressure chamber 40b of the compression chamber 40 to the muffler space.

[0053] The fixing hole 75 is a hole into which a fastening member 74 is inserted for attaching the valve body 72 and the valve guard 73 of the discharge valve 70 to the front head disc portion 87a.

[0054] A discharge valve 70 that closes the discharge hole 71 is attached to the upper surface of the front head 87. The discharge valve 70 includes a valve body 72 and a valve holder 73. As shown in FIG 3, one discharge valve 70 is attached so as to close one discharge hole 71.

[0055] The valve body 72 is a valve for preventing the backflow of the refrigerant from the high pressure space HS to the high pressure chamber 40b. The valve body 72 extends in the first direction D1 as the longitudinal direction, and has a blocking portion 72b that blocks the discharge hole 71 at one end in the first direction D1. The valve body 72 also has a first fixing portion 72a that is fixed to the front head 87 at the other end in the first direction D1. The valve body 72 is lifted upward by the pressure of the refrigerant inside the discharge hole 71. As a result, the high pressure chamber 40b of the compression chamber 40 communicates with the high pressure space HS via the discharge hole 71.

[0056] The valve holder 73 is a member that extends with the first direction D1 as its longitudinal direction, sandwiches the valve body 72 between itself and the front head 87, and limits deformation of the valve body 72. The valve holder 73 has a second flat portion 73a that sandwiches the valve body 72 between itself and the first flat portion 82 of the front head 87, and an inclined portion 73b that extends away from the front head 87 in a direction perpendicular to the second flat portion 73a as it approaches the discharge hole 71 in the first direction D1.

[0057] Here, when the valve body 72 of the discharge valve 70 and the valve guard 73 are placed on the front head 87, the center of gravity 73c of the valve guard 73 is located at a position overlapping the first flat surface portion 82, closer to the fixing hole 75 than the first end portion 88a of the countersunk portion 88. In other words, the center of gravity 73c of the valve guard 73 is located on the second flat surface portion 73a.

[0058] To achieve this, the valve guard 73 has the following structure, which will be described with reference to FIG.

[0059] 5 is a side view of the valve guard 73 in this embodiment. The average thickness H1 of the second flat portion 73a of the valve guard 73 is thicker than the average thickness H2 of the inclined portion 73b. This allows the center of gravity 73c of the valve guard 73 to be located at the second flat portion 73a while reducing the length of the second flat portion 73a in the first direction D1.

[0060] The reason why the center of gravity 73c of the valve guard 73 is located on the second flat surface portion 73a is as follows.

[0061] For example, when the valve guard 73, whose center of gravity 73c is disposed closer to the discharge hole 71 than the first end 88a of the countersunk portion 88, is attached to the front head 87, the valve guard 73 may be tilted toward the inclined portion 73b, and the end of the second flat portion 73a of the valve guard 73 on the fixing hole 75 side may lift up from the first flat portion 82. In that case, the end of the inclined portion 73b of the valve guard 73 on the discharge hole 71 side may come close to the discharge hole 71, and the lift amount of the valve body 72 may not be sufficient.

[0062] In contrast, in this embodiment, the center of gravity 73c of the valve guard 73 is disposed at a position that overlaps with the first flat portion 82, closer to the fixing hole 75 than the first end 88a of the countersunk portion 88. This makes it possible to prevent the end of the second flat portion 73a of the valve guard 73 on the fixing hole 75 side from lifting up from the first flat portion 82 when the valve guard 73 is attached to the front head 87. In addition, since the second flat portion 73a can be brought into close contact with the first flat portion 82 via the valve body 72, a sufficient lift amount of the valve body 72 can be ensured.

[0063] (2-1-2-4) Rear head The rear head 85 is a member that covers the second cylinder end surface 84b of the cylinder 84 and surrounds a portion of the compression chamber 40.

[0064] 2, the rear head 85 has a rear head disc portion 85a that closes the lower surface of the cylinder 84, and a rear head boss portion 85b that extends downward (in the direction away from the cylinder 84) from approximately the center of the rear head disc portion 85a. The rear head boss portion 85b has a cylindrical shape, and the rotating shaft 17 is inserted into its hollow portion. The rear head boss portion 85b functions as a bearing for the rotating shaft 17.

[0065] (2-1-3) Drive motor The drive motor 16 is a brushless DC motor housed inside the casing 10 and disposed above the compression mechanism 80. The drive motor 16 is mainly composed of a stator 51 fixed to the inner wall surface of the casing 10, and a rotor 52 housed inside the stator 51 so as to be able to rotate freely. An air gap is provided between the stator 51 and the rotor 52.

[0066] The stator 51 has a stator core 61 and a pair of insulators 62 attached to both vertical end faces of the stator core 61. The stator core 61 has a cylindrical portion and a plurality of teeth (not shown) protruding radially inward from the inner circumferential surface of the cylindrical portion. Conductive wires are wound around the teeth of the stator core 61 together with the pair of insulators 62. As a result, a coil 63 is formed on each tooth of the stator core 61.

[0067] The rotor 52 has a rotor core 52a made of multiple metal plates stacked in the vertical direction, and multiple magnets 52b embedded in the rotor core 52a. The magnets 52b are arranged at equal intervals along the circumferential direction of the rotor core 52a. The rotor 52 is connected to a rotating shaft 17 that passes through the center of rotation of the rotor 52 in the vertical direction. The rotor 52 is connected to a compression mechanism 80 via the rotating shaft 17.

[0068] When a current flows through the coil 63 , an electromagnetic force is generated in the stator 51 , causing the rotor 52 to rotate together with the rotating shaft 17 .

[0069] (2-1-4) Suction pipe The suction pipe 19 is a pipe that penetrates the body 11 of the casing 10. The end of the suction pipe 19 inside the casing 10 is fitted into the suction hole 84c of the cylinder 84 as described above. The end of the suction pipe 19 outside the casing 10 is connected to the refrigerant circuit 6. The suction pipe 19 is a pipe for supplying refrigerant from the refrigerant circuit 6 to the compression mechanism 80.

[0070] (2-1-5)Discharge pipe The discharge pipe 20 is a pipe that penetrates the top 12 of the casing 10. The end of the discharge pipe 20 inside the casing 10 is located in the space above the drive motor 16. The end of the discharge pipe 20 outside the casing 10 is connected to the refrigerant circuit 6. The discharge pipe 20 is a pipe for discharging the refrigerant compressed by the compression mechanism 80 to the refrigerant circuit 6.

[0071] (2-2) Compressor operation The operation of the compressor 1 will be described. When the drive motor 16 starts, the eccentric shaft portion 17a of the rotary shaft 17 rotates eccentrically about the axis 17g of the rotary shaft 17. As a result, the piston 81 connected to the eccentric shaft portion 17a rotates eccentrically in the cylinder 84.

[0072] As the piston 81 rotates eccentrically, the low pressure chamber 40a of the compression chamber 40, which communicates with the suction hole 84c, gradually increases in volume. As a result, low pressure refrigerant in the refrigeration cycle flows into the low pressure chamber 40a from the outside of the casing 10 via the suction pipe 19. As the piston 81 rotates eccentrically, the low pressure chamber 40a gradually decreases in volume to become the high pressure chamber 40b. As a result, the low pressure refrigerant that flows into the low pressure chamber 40a from the suction pipe 19 via the suction hole 84c is compressed in the compression chamber 40 (high pressure chamber 40b). The high pressure refrigerant compressed in the high pressure chamber 40b is discharged into the high pressure space HS via the discharge hole 71. The refrigerant discharged into the high pressure space HS is finally discharged from the discharge pipe 20 to the outside of the casing 10.

[0073] (2-3) How to install the discharge valve in the compressor 4, the discharge valve 70 is attached such that a portion of the valve body 72 and the valve retainer 73 of the discharge valve 70 overlaps with the countersunk portion 88. As shown in FIG 6, the method of attaching the discharge valve 70 of this embodiment includes a first step (step S1), a second step (step S2), and a third step (step S3).

[0074] In the first step, the valve body 72 and the valve holder 73 of the discharge valve 70 are placed on the front head 87 (step S1).

[0075] In the second step, as shown in FIG. 7, the valve holder fixing jig 77 temporarily holds the valve holder 73 of the discharge valve 70 placed on the front head 87 at a position closer to the fixing hole 75 than the first end 88a of the countersunk portion 88 (step S2).

[0076] In a third step, a rivet, which is a fastening member 74, is inserted into the fixing hole 75 to fix the discharge valve 70 to the compression mechanism 80 (step S3).

[0077] (3) Features (3-1) The compressor 1 according to the present embodiment includes a compression mechanism 80, a discharge valve 70, and a fastening member 74. The compression mechanism 80 includes a front head 87 as an example of a first member. The front head 87 surrounds at least a portion of the compression chamber 40 that compresses the refrigerant. The front head 87 includes a fixing hole 75 and a discharge hole 71 through which the refrigerant compressed in the compression chamber 40 is discharged, the fixing hole 75 and the discharge hole 71 are formed at a distance from each other along the first direction D1. The discharge valve 70 includes a valve body 72 and a valve holder 73. The valve body 72 includes a blocking portion 72b and a first fixed portion 72a. The valve body 72 extends with the first direction D1 as the longitudinal direction. The valve body 72 includes a blocking portion 72b that blocks the discharge hole 71 at one end in the first direction D1, and a first fixed portion 72a that is fixed to the front head 87 at the other end in the first direction D1. The valve guard 73 sandwiches the valve body 72 between the front head 87 and the valve guard 73, limiting deformation of the valve body 72. The fastening member 74 fixes the discharge valve 70 to the fixing hole 75 of the front head 87. The front head 87 has a countersunk portion 88 formed between the discharge hole 71 and the fixing hole 75 in the first direction D1. The countersunk portion 88 is recessed in a direction away from the valve body 72 and extends along the first direction D1. A part of the discharge valve 70 is disposed so as to overlap with the countersunk portion 88. Of both ends of the countersunk portion 88 in the first direction D1, a first end 88a disposed near the fixing hole 75 is disposed closer to the fixing hole 75 than a center 76 between the center 75a of the fixing hole 75 and the center 71a of the discharge hole 71. In the first direction D1, the center of gravity 73c of the valve guard 73 is disposed closer to the fixing hole 75 than the first end 88a of the countersunk portion 88.

[0078] In the compressor 1 of this embodiment, the center of gravity 73c of the valve guard 73 is positioned closer to the fixing hole 75 than the end (first end 88a) of the countersunk portion 88 on the fixing hole side, thereby preventing the valve guard 73 from being fixed to the front head 87 in a floating state.

[0079] (3-2) In the compressor 1 according to this embodiment, the front head 87 has a first flat portion 82 between the countersunk portion 88 and the fixing hole 75 in the first direction D1. The valve guard 73 has a second flat portion 73a and an inclined portion 73b. The second flat portion 73a sandwiches the valve body 72 between itself and the first flat portion 82 of the front head 87. The inclined portion 73b extends away from the front head 87 in a direction perpendicular to the second flat portion 73a as it approaches the discharge hole 71 from the second flat portion 73a in the first direction D1. The center of gravity 73c of the valve guard 73 is located on the second flat portion 73a.

[0080] In the compressor 1 according to this embodiment, with this configuration, when the second flat surface portion 73a of the valve guard 73 is placed on the first flat surface portion 82 so that the valve body 72 is sandwiched between the second flat surface portion 73a and the first flat surface portion 82 of the front head 87, the second flat surface portion 73a can be easily brought into close contact with the valve body 72. In addition, a state in which the second flat surface portion 73a is fixed to the front head 87 in a state inclined with respect to the first flat surface portion 82 can be prevented, and a predetermined valve lift amount can be secured.

[0081] (3-3) In the compressor 1 according to this embodiment, the average thickness H1 of the second flat portion 73a is greater than the average thickness H2 of the inclined portion 73b.

[0082] In the compressor 1 of this embodiment, the thickness of the second flat portion 73a of the valve retainer 73 is made large, so that the length of the second flat portion 73a in the first direction D1 can be reduced while the center of gravity 73c of the valve retainer 73 can be positioned at the second flat portion 73a.

[0083] (3-4) The method for attaching the discharge valve 70 according to this embodiment includes a first step (S1), a second step (S2), and a third step (S3). In the first step (S1), the valve body 72 and the valve holder 73 of the discharge valve 70 are placed on the front head 87. In the second step (S2), the valve holder fixing jig 77 temporarily holds the valve holder 73 of the discharge valve 70 placed on the front head 87 at a position closer to the fixing hole 75 than the first end 88a of the countersunk portion 88. In the third step (S3), the discharge valve 70 is fixed to the compression mechanism 80 by the fastening member 74.

[0084] In the mounting method of the discharge valve 70 according to this embodiment, the discharge valve 70 is temporarily held in the above-mentioned position, thereby preventing the valve holder 73 from being fixed to the front head 87 in a floating state.

[0085] (4) Variations Modifications of the above embodiment are shown below. The modifications may be combined as appropriate as long as they are not inconsistent with each other. Note that the same reference numerals are used to designate the same components as those in the above embodiment, and detailed descriptions thereof will be omitted.

[0086] (4-1) Variation A In this embodiment, the valve guard 73 has the average thickness H1 of the second flat portion 73a made thicker than the average thickness H2 of the inclined portion 73b, thereby restricting the length of the second flat portion 73a in the first direction D1 and disposing the center of gravity 73c of the valve guard 73 on the second flat portion 73a. However, the method of adjusting the position of the center of gravity 73c is not limited to this.

[0087] As shown in Figure 8, when the valve guard 73 is viewed in a direction perpendicular to the second flat portion 73a, the position of the center of gravity 73c may be adjusted by making the average width W1 of the second flat portion 73a in the second direction D2 perpendicular to the first direction D1 larger than the average width W2 of the inclined portion 73b in the second direction D2.

[0088] With the configuration according to this modification, the length of the second flat surface portion 73a in the first direction D1 can be reduced, while the center of gravity 73c of the valve guard 73 can be disposed on the second flat surface portion 73a.

[0089] (4-2) Variation B In this embodiment, the valve guard 73 has the average thickness H1 of the second flat portion 73a made thicker than the average thickness H2 of the inclined portion 73b, thereby restricting the length of the second flat portion 73a in the first direction D1 and disposing the center of gravity 73c of the valve guard 73 on the second flat portion 73a. However, the method of adjusting the position of the center of gravity 73c is not limited to this.

[0090] 8, the inclined portion 73b includes a second end 73d that overlaps with the blocking portion 72b when the valve guard 73 is viewed in a direction perpendicular to the second flat portion 73a. The inclined portion 73b may include a connection portion 73e between the second end 73d and the second flat portion 73a, the connection portion 73e having a width in a second direction D2 perpendicular to the first direction D1 when the valve guard 73 is viewed in a direction perpendicular to the second flat portion 73a, which is narrower than the width of the second end 73d in the second direction D2.

[0091] With the configuration according to this modification, the length of the second flat surface portion 73a in the first direction D1 can be reduced, while the center of gravity 73c of the valve guard 73 can be disposed on the second flat surface portion 73a.

[0092] In addition, the configuration in the above embodiment of making the average thickness H1 of the second flat portion 73a thicker than the average thickness H2 of the inclined portion 73b, the configuration in variant A of making the average width W1 of the second flat portion 73a larger than the average width W2 of the inclined portion 73b, and the configuration in variant B of providing a narrow connecting portion 73e on the inclined portion 73b may be adopted alone or in appropriate combination.

[0093] (4-3) Variation C In this embodiment, a rivet, which is the fastening member 74, is inserted into the fixing hole 75 to fix the discharge valve 70 to the compression mechanism 80. However, the fastening member 74 is not limited to a rivet, and may be a screw, a bolt, or the like.

[0094] (4-4) Variation D In this embodiment, a description has been given of a one-cylinder rotary compressor in which the valve body 72 and the valve guard 73 of the discharge valve 70 are attached to the front head disc portion 87a of the front head 87. However, the compressor 1 may be a two-cylinder rotary compressor.

[0095] (4-5) Variation E The valve body 92 and the valve guard 93 of the discharge valve 90 may be attached to a rear head disk portion 85a of a rear head 85 as an example of a first member.

[0096] 9 shows a cross-sectional view of the rear head 85 including the discharge valve 90 according to this modification. In this modification, the fixing hole 95 and the discharge hole 91 are formed at a distance from each other in the rear head 85, not in the front head 87. Here, the direction in which the fixing hole 95 and the discharge hole 91 are arranged side by side is referred to as a first direction D3.

[0097] 9, the rear head disk portion 85a of the rear head 85 has a countersunk portion 98 and a first flat portion 89 between the fixing hole 95 and the discharge hole 91 in the first direction D3. The first flat portion 89 is disposed between the countersunk portion 98 and the fixing hole 95.

[0098] The countersunk portion 98 is a recess located between the discharge hole 91 and the fixing hole 95 in the first direction D3, recessed in a direction away from the valve body 92 (the valve body 92 of the discharge valve 90 that blocks the discharge hole 91) and extending along the first direction D3.

[0099] A first end 98a, which is the end of the countersunk portion 98 on the fixing hole 95 side in the first direction D3, is positioned closer to the fixing hole 95 than the center 96 between the center 95a of the fixing hole 95 and the center 91a of the discharge hole 91.

[0100] The discharge hole 91 is a cylindrical hole that passes through the rear head disk portion 85a in the vertical direction.

[0101] The fixing hole 95 is a hole into which a fastening member 94 is inserted for attaching the valve body 92 and the valve guard 93 of the discharge valve 90 to the rear head disc portion 85a.

[0102] A discharge valve 90 that closes the discharge hole 91 is attached to the lower surface of the rear head 85. The discharge valve 90 includes a valve body 92 and a valve holder 93.

[0103] The valve body 92 is a valve for preventing the refrigerant from flowing back from the high pressure space to the high pressure chamber. The valve body 92 extends in the first direction D3 as the longitudinal direction, and has a blocking portion 92b that blocks the discharge hole 91 at one end in the first direction D3. The valve body 92 also has a first fixed portion 92a that is fixed to the rear head 85 at the other end in the first direction D3. The valve body 92 is pressed downward by the pressure of the refrigerant inside the discharge hole 91. This opens the discharge hole 91, and the discharge hole 91 communicates with the high pressure space.

[0104] The valve guard 93 is a member that extends with the first direction D3 as its longitudinal direction, and sandwiches the valve body 92 between itself and the rear head 85 to restrict deformation of the valve body 92.

[0105] When the valve body 92 of the discharge valve 90 and the valve guard 93 are placed on the rear head 85, the center of gravity 93c of the valve guard 93 is located at a position overlapping the first flat portion 89, closer to the fixing hole 95 than the first end 98a of the countersunk portion 98. In other words, the center of gravity 93c of the valve guard 93 is located on the second flat portion 93a.

[0106] <Other embodiments> Although the embodiments according to the present disclosure have been described above, it will be understood that various changes in form and details are possible without departing from the spirit and scope of the claims. [Explanation of symbols]

[0107] 1 Compressor 40 Compression chamber 70 Discharge valve 71 Discharge hole 71a center 72 Valve body 72a 1st fixed part 72b Occlusion 73 Valve holder 73a 2nd plane part 73b Slope 73c Center of gravity 73d 2nd end 73e Connection 74 Fastening members 75 fixing hole 75a center 76 center 77 Fixture 80 Compression Mechanism 82 1st plane part 85 Rear head (first component) 87 Front head (first member) 88 Counterbore 88a 1st end 89 1st plane part 90 Discharge valve 91 Discharge hole 91a center 92 Valve body 92a 1st fixed part 92b Occlusion 93 Valve holder 93a 2nd plane part 93b Slope 93c Center of gravity 94 Fastening members 95 fixing hole 95a center 96 center 98 Counterbore 98a First end 100 Refrigeration cycle device D1 1st direction D2 2nd direction D3 1st direction H1 Thickness H2 Thickness W1 width W2 Width [Prior art documents] [Patent documents]

[0108] [Patent Document 1] Patent Gazette No. 4910440

Claims

1. a compression mechanism (80) including a first member (85, 87) surrounding at least a portion of a compression chamber (40) that compresses a refrigerant, and in which a fixing hole (75, 95) and a discharge hole (71, 91) through which the refrigerant compressed in the compression chamber is discharged are formed at a distance from each other along a first direction (D1, D3); a discharge valve (70, 90) including: a valve body (72, 92) extending with the first direction as a longitudinal direction, the valve body having a blocking portion (72b, 92b) at one end in the first direction that blocks the discharge hole and a first fixed portion (72a, 92a) at the other end in the first direction that is fixed to the first member; and a valve holder (73, 93) that sandwiches the valve body between the valve body and the first member to limit deformation of the valve body; a fastening member (74, 94) that fastens the discharge valve to the fastening hole of the first member; Equipped with The first member has a countersunk portion (88, 98) formed between the discharge hole and the fixing hole in the first direction, the countersunk portion being recessed in a direction away from the valve body and extending along the first direction, A portion of the discharge valve is disposed so as to overlap with the countersunk portion, Of both ends of the countersunk portion in the first direction, a first end (88a, 98a) that is disposed near the fixing hole is disposed nearer to the fixing hole than a center (76, 96) between a center (75a, 95a) of the fixing hole and a center (71a, 91a) of the discharge hole, In the first direction, a center of gravity (73c, 93c) of the valve guard is disposed closer to the fixing hole than the first end of the countersunk portion. Compressor (1).

2. The first member has a first flat portion (82, 89) between the countersunk portion and the fixing hole in the first direction, the valve holder has a second flat surface portion (73a, 93a) that sandwiches the valve body between itself and the first flat surface portion of the first member, and an inclined portion (73b, 93b) that extends away from the first member in a direction perpendicular to the second flat surface portion as it approaches the discharge hole from the second flat surface portion in the first direction, The center of gravity of the valve guard is disposed on the second planar portion. The compressor according to claim 1 .

3. The average thickness (H1) of the second flat portion is greater than the average thickness (H2) of the inclined portion. The compressor according to claim 2.

4. When the valve guard is viewed in a direction perpendicular to the second flat portion, an average width (W1) of the second flat portion in a second direction (D2) perpendicular to the first direction is larger than an average width (W2) of the inclined portion in the second direction. The compressor according to claim 2 or 3.

5. The inclined portion includes a second end portion (73d) that overlaps with the blocking portion when the valve guard is viewed from a direction perpendicular to the second flat portion, The inclined portion includes a connection portion (73e) between the second end portion and the second flat portion, the connection portion having a width in a second direction perpendicular to the first direction when the valve guard is viewed from a direction perpendicular to the second flat portion, which is narrower than the width of the second end portion in the second direction. The compressor according to claim 2.

6. A method for mounting a discharge valve in the compressor according to claim 1 or 2, comprising the steps of: A first step (S1) of placing the valve body and the valve holder of the discharge valve on the first member; a second step (S2) in which a valve holder fixing jig (77) temporarily holds the valve holder of the discharge valve placed on the first member at a position closer to the fixing hole than the first end of the countersunk portion; a third step (S3) of fixing the discharge valve to the compression mechanism by the fastening member; Equipped with How to install the discharge valve.

7. A compressor according to claim 1 or 2, A refrigeration cycle device (100).

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