Compressor and air conditioning device

Abstract

Provided is a compressor that has a simple structure and can achieve a high compression efficiency, and an air conditioner including the compressor. The compressor (21) has an injection valve (93) disposed in an injection passage (84g) communicating with a compression chamber (40). The injection valve (93) has a valve body (94), a valve pressing member (95), and a valve seat (96). The valve body (94) is configured to be movable along a first direction (D1). The valve pressing member (95) restricts the movement of the valve body (94) toward the injection pipe (92) side. The valve seat (96) restricts the movement of the valve body (94) toward the compression chamber (40) side. The valve pressing member (95) is formed with a first hole (95a) that is closed by the valve body (94) when refrigerant flows out of the compression chamber (40). The valve body (94) is formed with a second hole (94a). The compressor (21) is formed with a buffer space (95c), and the refrigerant flowing from the compression chamber (40) into a first space (97) housing the valve body (94) flows into the buffer space (95c) before reaching the first hole (95a).

Description

Technical Field

[0001] The present invention relates to a compressor and an air conditioner. Background Art

[0002] Patent Document 1 (International Publication No. 2017 / 221571) discloses a compressor including an injection mechanism that allows refrigerant at an intermediate pressure to flow into a compression chamber. The injection mechanism has a check valve that inhibits the flow of refrigerant from the compression chamber into the injection passage. The check valve has a valve element and a spring member, and restricts the outflow of refrigerant from the compression chamber into the injection passage when the refrigerant in the compression chamber is at a high pressure, and allows the refrigerant at the intermediate pressure to flow from the injection passage into the compression chamber when the refrigerant in the compression chamber is at a low pressure. Summary of the Invention

[0003] Problems to be Solved by the Invention

[0004] As a different type of check valve, a check valve is known that uses the pressure difference between the refrigerant inside and outside the compression chamber to move a plate-shaped valve element housed in a housing space. The check valve having a plate-shaped valve element has a simpler structure than the check valve having a spring member. On the other hand, there is a problem that, due to the weight and shape of the valve element, even when the refrigerant in the compression chamber becomes high pressure, the valve element does not move quickly, and the high-pressure refrigerant flows out of the compression chamber, resulting in low compression efficiency.

[0005] The present disclosure provides a compressor with a simple structure and capable of achieving high compression efficiency, and an air conditioner including the compressor.

[0006] Means for Solving the Problems

[0007] The compressor according to the first aspect includes a compression mechanism, an injection valve, and an injection pipe. The compression mechanism has a compression chamber that compresses refrigerant. The injection valve is disposed in an injection passage communicating with the compression chamber. The injection pipe supplies refrigerant to the injection passage.

[0008] The injection valve has a valve body, a valve pressing member, and a valve seat. The valve body is configured to be movable along a first direction. The valve pressing member is disposed on the side closer to the injection pipe than the valve body, and restricts the movement of the valve body toward the injection pipe side. The valve seat is disposed on the side closer to the compression chamber than the valve body, and restricts the movement of the valve body toward the compression chamber side. The valve pressing member is formed with a first hole through which the refrigerant flowing out of the compression chamber passes. The valve body is formed with a second hole through which the refrigerant passes.

[0009] The compressor forms a buffer space that communicates with a first space in which the valve body is housed between the valve pressing member and the valve seat, and into which the refrigerant flowing from the compression chamber into the first space flows.

[0010] In a compressor, at least a part of the refrigerant flowing into a first space before the end of intermediate injection of the intermediate-pressure refrigerant into the compressor flows into a buffer space before reaching a first hole. As a result, a time lag occurs during the period from when the refrigerant flows into the first space until it reaches the first hole. The valve body that abuts against the valve seat during intermediate injection moves toward the valve pressing member during this time lag, and it is possible to suppress the outflow of the refrigerant from the compression chamber to the injection passage.

[0011] The compressor of the second aspect has a compression mechanism, an injection valve, and an injection pipe. The compression mechanism has a compression chamber that compresses the refrigerant. The injection valve is disposed in an injection passage communicating with the compression chamber. The injection pipe supplies the refrigerant to the injection passage.

[0012] The injection valve has a valve body, a valve pressing member, and a valve seat. The valve body is configured to be movable along a first direction. The valve pressing member is disposed at a position closer to the injection pipe side than the valve body and restricts the movement of the valve body toward the injection pipe side. The valve seat is disposed at a position closer to the compression chamber side than the valve body and restricts the movement of the valve body toward the compression chamber side. The valve pressing member is formed with a first hole through which the refrigerant passes, and when the refrigerant flows out from the compression chamber, the first hole is closed by the valve body. The valve body is formed with a second hole through which the refrigerant passes.

[0013] The compressor is formed with a buffer space that communicates with a first space in which the valve body is received between the valve pressing member and the valve seat, and the refrigerant flowing into the first space from the compression chamber flows into the buffer space before reaching the first hole.

[0014] In a compressor, at least a part of the refrigerant flowing into a first space before the end of intermediate injection of the intermediate-pressure refrigerant into the compressor flows into a buffer space before reaching a first hole. As a result, a time lag occurs during the period from when the refrigerant flows into the first space until it reaches the first hole. The valve body that abuts against the valve seat during intermediate injection moves toward the valve pressing member during this time lag, and it is possible to suppress the outflow of the refrigerant from the compression chamber to the injection passage.

[0015] Thus, in this compressor, the injection valve has a simple structure without using a spring member, and it suppresses the outflow of the refrigerant from the compression chamber to the injection passage before the end of intermediate injection, and thus high compression efficiency can be obtained.

[0016] In the compressor of the third aspect, in the compressor of the first or second aspect, the buffer space is formed at a position closer to the injection pipe side than the second hole.

[0017] In the compressor of the fourth aspect, in the compressor of any one of the first to third aspects, the buffer space is a recess formed in the surface of the valve pressing member facing the valve body.

[0018] In the compressor according to the fifth aspect, among the compressors according to any one of the first to fourth aspects, the first space is cylindrical. The valve body is a circular flat plate having a second hole formed at the center. The buffer space is located on the central axis of the first space together with the second hole.

[0019] Accordingly, since the buffer space and the second hole are located on the central axis, most of the refrigerant that has passed through the second hole can flow into the buffer space, effectively suppressing the outflow of the refrigerant from the compression chamber. Thus, with this compressor, high compression efficiency can be obtained.

[0020] In the compressor according to the sixth aspect, among the compressors according to any one of the first to fifth aspects, the ratio of the area of the opening of the buffer space facing the valve body to the flow path area of the second hole is 0.5 or more and 1.0 or less.

[0021] Accordingly, most of the refrigerant that has passed through the second hole can flow into the buffer space, so that the outflow of the refrigerant from the compression chamber is effectively suppressed. Thus, with this compressor, high compression efficiency can be obtained.

[0022] In the compressor according to the seventh aspect, among the compressors according to any one of the first to sixth aspects, the ratio of the depth of the buffer space in the first direction of the first space to the length of the first hole in the first direction is 0.3 or more and 0.6 or less.

[0023] Accordingly, most of the refrigerant that has passed through the second hole can flow into the buffer space, so that a time lag can be reliably generated from when the refrigerant flows into the first space until it reaches the first hole, effectively suppressing the outflow of the refrigerant from the compression chamber. Thus, with this compressor, high compression efficiency can be obtained.

[0024] In the compressor according to the eighth aspect, among the compressors according to any one of the first to seventh aspects, the valve seat is formed with a third hole that communicates the first space with the compression chamber. The ratio of the volumes of the first space and the third hole to the volume of the buffer space is 0.2 or more and 0.8 or less.

[0025] Accordingly, most of the refrigerant flowing into the first space can flow into the buffer space, so that a time lag can be reliably generated from when the refrigerant flows into the first space until it reaches the first hole, effectively suppressing the outflow of the refrigerant from the compression chamber. Thus, with this compressor, high compression efficiency can be obtained.

[0026] The compressor according to the ninth aspect includes a compression chamber and a valve. In the compression chamber, the refrigerant is compressed. The valve is disposed in an injection passage communicating with the compression chamber. The valve has a valve body, a valve pressing member, and a valve seat. The valve body is housed in the first space. The valve pressing member is formed with a first hole communicating with the first space and divides the first space. The valve seat is formed with a third hole communicating with the first space and divides the first space.

[0027] The valve pressing member is formed with a recess, which is a buffer space having an opening provided on the surface of the valve pressing member facing the first space.

[0028] In the compressor, at least a part of the refrigerant flowing into the first space just before the intermediate injection of the refrigerant at intermediate pressure into the compressor reaches the first hole and flows into the buffer space. As a result, a time lag is generated during the period from when the refrigerant flows into the first space until it reaches the first hole. The valve body abutting against the valve seat during the intermediate injection moves toward the valve pressing member during this time lag, and it is possible to suppress the outflow of the refrigerant from the compression chamber to the injection passage.

[0029] In the compressor according to the tenth aspect, in the compressor according to the ninth aspect, the valve body is a circular flat plate formed with a second hole. The first space is cylindrical. The recess and the second hole are located on the central axis of the first space.

[0030] In the compressor according to the eleventh aspect, in the compressor according to the ninth or tenth aspect, the buffer space is a space into which the refrigerant flowing into the first space flows.

[0031] The air conditioner according to the twelfth aspect includes the compressor according to any one of the first to eleventh aspects.

[0032] Since this air conditioner includes a compressor with high compression efficiency, it is possible to perform efficient air conditioning operation. BRIEF DESCRIPTION OF THE DRAWINGS

[0033] Figure 1 It is a schematic structural diagram of the air conditioner 1 according to the embodiment.

[0034] Figure 2 It is a longitudinal sectional view of the compressor 21.

[0035] Figure 3 It is Figure 2 a sectional view of the compression mechanism 15 at the line A - A of

[0036] Figure 4 It is an external view of the cylinder block 84.

[0037] Figure 5 It is a sectional view showing the structure of the injection valve 93 in the first state.

[0038] Figure 6 It is a sectional view showing the structure of the injection valve 93 in the second state.

[0039] Figure 7 It is a sectional view obtained by magnifying the periphery of the first space 97 in the second state.

[0040] Figure 8 It is a plan view of the valve body 94 when viewed along the first direction D1.

[0041] Figure 9 It is a plan view of the valve pressing member 95 when viewed from the inner peripheral surface 86c side of the cylinder body along the first direction D1.

[0042] Figure 10 It is a cross-sectional view of the compression mechanism 15 when the piston 81 is at the top dead center.

[0043] Figure 11 It is a cross-sectional view of the compression mechanism 15 when the piston 81 closes the suction hole 84b.

[0044] Figure 12 It is a cross-sectional view of the compression mechanism 15 when the piston 81 closes the injection passage 84g. Detailed implementation mode

[0045] The air-conditioning device 1 including a compressor 21 according to an embodiment of the present disclosure will be described with reference to the accompanying drawings.

[0046] (1) Air-conditioning device

[0047] (1-1) Overall structure

[0048] As Figure 1 shown, the air-conditioning device 1 is a device that can perform refrigeration and heating in a room such as a building by performing a vapor compression refrigeration cycle. The air-conditioning device 1 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. The vapor compression refrigerant circuit 6 of the air-conditioning device 1 is constituted by connecting the outdoor unit 2 and the indoor unit 3 via the liquid refrigerant connection pipe 4 and the gas refrigerant connection pipe 5.

[0049] (1-2) Detailed composition

[0050] (1-2-1) Indoor unit

[0051] The indoor unit 3 is installed indoors (such as a living room and a ceiling back space), 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 absorber (evaporator) during refrigeration operation to cool the indoor air, and functions as a refrigerant radiator (condenser) during heating operation to heat the indoor air. 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.

[0052] (1-2-2) Outdoor unit

[0053] The outdoor unit 2 is installed outdoors (near the roof of a building and the wall surface of a building, etc.) and forms a part of the refrigerant circuit 6. The outdoor unit 2 mainly includes a compressor 21, a four-way switching valve 22, an outdoor heat exchanger 23, an outdoor expansion valve 24, a liquid receiver 25, a liquid shut-off valve 26, a gas shut-off valve 27, an energy-saving heat exchanger 28, and a control unit 29.

[0054] The compressor 21 compresses the low-pressure gaseous refrigerant to make it a high-pressure gaseous refrigerant. The compressor 21 is driven by a compressor motor. The compressor 21 is a rotary compressor. In the compressor 21, part of the intermediate-pressure refrigerant flowing from the outdoor heat exchanger 23 toward the outdoor expansion valve 24 is supplied for intermediate injection into the compressor 21 that compresses the refrigerant. The intermediate pressure is a specified pressure between the pressure of the gaseous refrigerant sucked into the compressor 21 (low pressure) and the pressure of the gaseous refrigerant discharged from the compressor 21 (high pressure).

[0055] The four-way switching valve 22 switches the connection state of the internal piping of the outdoor unit 2. When the air conditioner 1 is in the cooling operation, the four-way switching valve 22 realizes Figure 1 the connection state shown by the dotted line. When the air conditioner 1 is in the heating operation, the four-way switching valve 22 realizes Figure 1 the connection state shown by the solid line.

[0056] The outdoor heat exchanger 23 performs heat exchange between the refrigerant circulating in the refrigerant circuit 6 and the outdoor air. The outdoor heat exchanger 23 has a refrigerant flow path for the refrigerant to flow through and heat transfer fins in contact with the outdoor air. The outdoor heat exchanger 23 functions as a radiator (condenser) for the refrigerant during the cooling operation and functions as an absorber (evaporator) for the refrigerant during the heating operation.

[0057] The outdoor expansion valve 24 is an electric valve or a solenoid valve capable of adjusting the opening degree. The outdoor expansion valve 24 reduces the pressure of the refrigerant flowing in the internal piping of the outdoor unit 2. The outdoor expansion valve 24 controls the flow rate of the refrigerant flowing in the internal piping of the outdoor unit 2.

[0058] The liquid receiver 25 is arranged on the piping on the suction side of the compressor 21. The liquid receiver 25 separates the gas-liquid mixed refrigerant flowing in the refrigerant circuit 6 into gaseous refrigerant and liquid refrigerant and stores the liquid refrigerant. The gaseous refrigerant separated by the liquid receiver 25 is transported to the suction port of the compressor 21.

[0059] The liquid shut-off valve 26 and the gas shut-off valve 27 are valves capable of cutting off the refrigerant flow path. The liquid shut-off valve 26 is arranged between the indoor heat exchanger 31 and the outdoor expansion valve 24. The gas shut-off valve 27 is arranged between the indoor heat exchanger 31 and the four-way switching valve 22. The liquid shut-off valve 26 and the gas shut-off valve 27 are opened and closed by an operator, for example, when installing the air conditioner 1.

[0060] The energy-saving heat exchanger 28 is arranged between the outdoor heat exchanger 23 and the outdoor expansion valve 24. The energy-saving heat exchanger 28 performs heat exchange between the refrigerant flowing from the outdoor heat exchanger 23 toward the outdoor expansion valve 24 and the refrigerant flowing in the energy-saving pipe 90. The energy-saving pipe 90 is a pipe branched between the energy-saving heat exchanger 28 and the outdoor expansion valve 24 in the refrigerant circuit 6 and connected to an injection pipe 92 (described later). An energy-saving valve 91 is installed in the energy-saving pipe 90. The refrigerant flowing in the energy-saving pipe 90 is decompressed by the energy-saving valve 91 and then performs heat exchange with the refrigerant flowing from the outdoor heat exchanger 23 toward the outdoor expansion valve 24 in the energy-saving heat exchanger 28. The refrigerant that has performed heat exchange with the refrigerant flowing from the outdoor heat exchanger 23 toward the outdoor expansion valve 24 in the energy-saving heat exchanger 28 is supplied as an intermediate-pressure refrigerant to the injection pipe 92.

[0061] The control unit 29 is a computer that controls the constituent devices of the outdoor unit 2. The control unit 29 mainly includes an arithmetic device and a storage device. The arithmetic device is, for example, a CPU or a GPU. The arithmetic device reads the program stored in the storage device and performs a specified arithmetic process according to the program. The arithmetic device writes the arithmetic result into the storage device or reads the information stored in the storage device according to the program.

[0062] (1-2-3) Refrigerant connection pipe

[0063] The liquid refrigerant connection pipe 4 and the gas refrigerant connection pipe 5 are refrigerant pipes constructed on-site when installing the air conditioner 1 having the refrigerant circuit 6 in a building or other installation sites. The lengths and diameters of the liquid refrigerant connection pipe 4 and the gas refrigerant connection pipe 5 are determined according to installation conditions such as the installation site of the air conditioner 1 and the combination of the outdoor unit 2 and the indoor unit 3. The refrigerant flowing in the liquid refrigerant connection pipe 4 can be liquid or a gas-liquid two-phase.

[0064] (1-3) Operation of the air conditioner

[0065] Refer to Figure 1 , and the operations during the cooling operation and the heating operation of the air conditioner 1 will be described.

[0066] (1-3-1) Heating operation

[0067] When the air conditioner 1 performs a heating operation, the four-way switching valve 22 is switched toFigure 1 The state shown by the solid line. In the refrigerant circuit 6, the low-pressure gaseous refrigerant of the refrigeration cycle is sucked into the compressor 21, compressed to become the high pressure of the refrigeration cycle, and then discharged. The high-pressure gaseous refrigerant discharged from the compressor 21 is transported to the indoor heat exchanger 31 via the four-way switching valve 22, the gas stop valve 27, and the gas refrigerant connection pipe 5. The high-pressure gaseous refrigerant transported 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. Thereby, the indoor air is heated. The liquid refrigerant condensed in the indoor heat exchanger 31 is transported to the outdoor expansion valve 24 via the liquid refrigerant connection pipe 4 and the liquid stop valve 26. The refrigerant transported to the outdoor expansion valve 24 is depressurized to the low pressure of the refrigeration cycle by the outdoor expansion valve 24. The low-pressure refrigerant depressurized by the outdoor expansion valve 24 is transported to the outdoor heat exchanger 23. The low-pressure refrigerant transported 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 gaseous refrigerant. The low-pressure refrigerant evaporated in the outdoor heat exchanger 23 is sucked into the compressor 21 again via the four-way switching valve 22 and the accumulator 25.

[0068] (1-3-2) Refrigeration operation

[0069] When the air conditioner 1 performs refrigeration operation, the four-way switching valve 22 is switched to Figure 1 The state shown by the dashed line. In the refrigerant circuit 6, the low-pressure gaseous refrigerant of the refrigeration cycle is sucked into the compressor 21, compressed to become the high pressure of the refrigeration cycle, and then discharged. The high-pressure gaseous refrigerant discharged from the compressor 21 is transported to the outdoor heat exchanger 23 via the four-way switching valve 22. The high-pressure gaseous refrigerant transported 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 depressurized to the low pressure of the refrigeration cycle by the outdoor expansion valve 24. The low-pressure refrigerant depressurized by the outdoor expansion valve 24 is transported to the indoor heat exchanger 31 via the liquid stop valve 26 and the liquid refrigerant connection pipe 4. The refrigerant transported 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 gaseous refrigerant. Thereby, the indoor air is cooled. The gaseous refrigerant evaporated in the indoor heat exchanger 31 is sucked into the compressor 21 again via the gas refrigerant connection pipe 5, the gas stop valve 27, the four-way switching valve 22, and the accumulator 25.

[0070] (2) Compressor

[0071] (2-1) Overall structure

[0072] As Figure 2As shown in the figure, the compressor 21 mainly includes a housing 10, a compression mechanism 15, a drive motor 16, a crankshaft 17, a suction pipe 19, a discharge pipe 20, an injection pipe 92, and an injection valve 93.

[0073] (2-1-1) Housing

[0074] The housing 10 is composed of a cylindrical main 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 main body 11. The bottom 13 is airtightly connected to the lower end of the main body 11.

[0075] The housing 10 is formed of a rigid member that is not easily deformed or damaged due to changes in pressure and temperature between the internal space and the external space of the housing 10. The housing 10 is arranged such that the axial direction of the cylindrical shape of the main body 11 is along the vertical direction. The lower part of the internal space of the housing 10 is an oil storage part 10a for storing lubricating oil. The lubricating oil is a refrigeration oil used to improve the lubricity of the sliding parts inside the housing 10.

[0076] The housing 10 mainly houses the compression mechanism 15, the drive motor 16, and the crankshaft 17. The compression mechanism 15 is connected to the drive motor 16 via the crankshaft 17. The suction pipe 19, the discharge pipe 20, and the injection pipe 92 are airtightly connected to the housing 10 in a manner that penetrates the housing 10.

[0077] (2-1-2) Compression mechanism

[0078] As Figure 2 and Figure 3 shown, the compression mechanism 15 mainly consists of a front cover 83, a cylinder block 84, a rear cover 85, a piston 81, and a bushing 82. The front cover 83, the cylinder block 84, and the rear cover 85 are integrally fastened by bolts or the like. The space above the compression mechanism 15 is a high-pressure space HS for discharging the refrigerant compressed by the compression mechanism 15.

[0079] The compression mechanism 15 is immersed in the lubricating oil stored in the oil storage part 10a. The lubricating oil in the oil storage part 10a is supplied to the internal sliding parts of the compression mechanism 15 by means of differential pressure or the like. Next, each component of the compression mechanism 15 will be described.

[0080] (2-1-2-1) Cylinder block

[0081] As Figure 4 shown, the cylinder block 84 mainly has a cylinder block hole 84a, a suction hole 84b, a discharge notch 84c, a bushing receiving hole 84d, a vane receiving hole 84e, and an injection passage 84g. The cylinder block 84 is located between the front cover 83 and the rear cover 85. The upper end face of the cylinder block 84, i.e., the first cylinder block end face 86a, contacts the lower surface of the front cover 83. The lower end face of the cylinder block 84, i.e., the second cylinder block end face 86b, contacts the upper surface of the rear cover 85.

[0082] The cylinder block hole 84a is a cylindrical hole that penetrates the cylinder block 84 in the vertical direction from the first cylinder block end face 86a toward the second cylinder block end face 86b. The cylinder block hole 84a is a space surrounded by the inner peripheral surface of the cylinder block 84, that is, the inner cylinder peripheral surface 86c. The cylinder block hole 84a houses the eccentric shaft portion 17a of the crankshaft 17 and the piston 81.

[0083] The suction hole 84b is a hole that penetrates from the outer peripheral surface of the cylinder block 84, that is, the outer cylinder peripheral surface 86d, toward the inner cylinder peripheral surface 86c along the radial direction of the cylinder block 84.

[0084] The discharge notch 84c is a space formed by cutting a part of the inner cylinder peripheral surface 86c and not penetrating the cylinder block 84 in the vertical direction. The discharge notch 84c is formed on the side of the first cylinder block end face 86a.

[0085] The bushing housing hole 84d is a hole that penetrates the cylinder block 84 in the vertical direction and is disposed between the suction hole 84b and the discharge notch 84c when observing the cylinder block 84 in the vertical direction. The bushing housing hole 84d houses a part of the vane 81b and the bushing 82.

[0086] The vane housing hole 84e is a hole that penetrates the cylinder block 84 in the vertical direction and communicates with the bushing housing hole 84d. The vane housing hole 84e houses a part of the vane 81b.

[0087] The injection passage 84g is a hole that penetrates from the outer peripheral surface of the cylinder block 84 toward the inner peripheral surface of the cylinder block 84 along the radial direction of the cylinder block 84. As Figure 3 shown, when observing the cylinder block 84 in the vertical direction, the bushing housing hole 84d is disposed between the suction hole 84b and the injection passage 84g. An injection valve 93 is disposed in the injection passage 84g. The injection passage 84g communicates with the injection pipe 92 on the outer peripheral surface side of the cylinder block 84 and communicates with the compression chamber 40 on the inner peripheral surface side of the cylinder block 84.

[0088] (2-1-2-2) Piston

[0089] The piston 81 is a substantially cylindrical member inserted into the cylinder block hole 84a of the cylinder block 84. The upper end face of the piston 81 contacts the lower surface of the front cover 83. The lower end face of the piston 81 contacts the upper surface of the rear cover 85.

[0090] The piston 81 is inserted into the cylinder block hole 84a of the cylinder block 84 in a state of being fitted to the eccentric shaft portion 17a of the crankshaft 17. Thus, the piston 81 performs eccentric rotation by the rotation of the shaft of the crankshaft 17, and thus performs a revolution motion centered on the rotation axis 17g of the crankshaft 17. When looking down at the compression mechanism 15, the piston 81 revolves clockwise.

[0091] The vane 81b is received in the bushing receiving hole 84d and the vane receiving hole 84e of the cylinder block 84. The vane 81b is integrally formed with the piston 81. The vane 81b extends along the radial direction of the piston 81 so as to protrude radially outward of the piston 81. By the revolution of the piston 81, the vane 81b moves forward and backward along its length direction while swinging. At this time, the bushing 82 supports the vane 81b while rotating in the bushing receiving hole 84d.

[0092] The compression mechanism 15 has a compression chamber 40, which is a space surrounded by the cylinder block 84, the piston 81, the vane 81b, the front cover 83 and the rear cover 85. The compression chamber 40 is a part of the cylinder block hole 84a, and is a space for compressing the refrigerant by changing the volume as the piston 81 revolves. Lubricating oil from the oil storage part 10a is supplied to the compression chamber 40.

[0093] The compression chamber 40 is divided by the piston 81 and the vane 81b into a low-pressure chamber 40a communicating with the suction hole 84b and a high-pressure chamber 40b communicating with the discharge notch 84c and the injection passage 84g. In Figure 3 this case, the low-pressure chamber 40a and the high-pressure chamber 40b are regions surrounded by the inner peripheral surface 86c of the cylinder block and the outer peripheral surface of the piston 81, i.e., the piston outer peripheral surface 81c. The volumes of the low-pressure chamber 40a and the high-pressure chamber 40b change according to the position of the piston 81.

[0094] (2-1-2-3) Bushing

[0095] The bushing 82 is a pair of substantially semi-cylindrical members. The bushing 82 is received in the bushing receiving hole 84d of the cylinder block 84 so as to sandwich the vane 81b. The bushing 82 can slide relative to the cylinder block 84.

[0096] (2-1-2-4) Front cover

[0097] The front cover 83 is a member that covers the first cylinder block end face 86a of the cylinder block 84. The front cover 83 is fastened to the housing 10 by bolts or the like. The front cover 83 has an upper bearing portion 23a for supporting the crankshaft 17.

[0098] The front cover 83 has a discharge port 23b. The discharge port 23b is a cylindrical hole that penetrates the front cover 83 in the vertical direction. The discharge port 23b communicates with the discharge notch 84c and the compression chamber 40 (high-pressure chamber 40b) on the lower side in the vertical direction. The discharge port 23b communicates with the high-pressure space HS on the upper side in the vertical direction. The discharge port 23b is a flow path for delivering the refrigerant compressed by the compression mechanism 15 from the high-pressure chamber 40b to the high-pressure space HS.

[0099] On the upper surface of the front cover 83, a discharge valve 23c that blocks the discharge port 23b is installed. The discharge valve 23c is a valve for preventing the refrigerant from flowing back from the high-pressure space HS to the high-pressure chamber 40b. The discharge valve 23c is lifted upward by the pressure of the refrigerant inside the discharge port 23b. As a result, the discharge port 23b opens, and the discharge port 23b communicates with the high-pressure space HS.

[0100] (2-1-2-5) Rear cover

[0101] The rear cover 85 is a component that covers the second cylinder end face 86b of the cylinder block 84. The rear cover 85 has a lower bearing portion 25a for supporting the crankshaft 17. The cylinder bore 84a of the cylinder block 84 is closed by the front cover 83 and the rear cover 85.

[0102] (2-1-3) Drive motor

[0103] The drive motor 16 is a brushless DC motor housed inside the housing 10 and disposed above the compression mechanism 15. The drive motor 16 mainly consists of a stator 51 fixed to the inner wall surface of the housing 10 and a rotor 52 rotatably housed inside the stator 51. An air gap is provided between the stator 51 and the rotor 52.

[0104] The stator 51 has a stator core 61 and a pair of insulators 62 mounted on the 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 peripheral surface of the cylindrical portion. The teeth of the stator core 61 and the pair of insulators 62 are wound with a wire. As a result, coils 72a are formed on each tooth of the stator core 61.

[0105] On the outer side surface of the stator 51, a plurality of core cutting portions (not shown) with cuts are provided at regular intervals in the circumferential direction from the upper end face to the lower end face of the stator 51. The core cutting portions form a motor cooling passage extending in the vertical direction between the main body portion 11 and the stator 51.

[0106] The rotor 52 has a rotor core 52a composed of a plurality of metal plates laminated in the vertical direction and a plurality of 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 the crankshaft 17 passing through its rotation center in the vertical direction. The rotor 52 is connected to the compression mechanism 15 via the crankshaft 17.

[0107] (2-1-4) Crankshaft

[0108] The crankshaft 17 is housed inside the housing 10 and is arranged with its axis along the vertical direction. The crankshaft 17 is connected to the rotor 52 of the drive motor 16 and the piston 81 of the compression mechanism 15. The crankshaft 17 has an eccentric shaft portion 17a. The eccentric shaft portion 17a is connected to the piston 81 inserted into the cylinder hole 84a of the cylinder block 84. The upper end of the crankshaft 17 is connected to the rotor 52 of the drive motor 16. The crankshaft 17 is supported by the upper bearing portion 23a of the front cover 83 and the lower bearing portion 25a of the rear cover 85. The crankshaft 17 rotates about the rotation axis 17g.

[0109] (2-1-5) Suction pipe

[0110] The suction pipe 19 is a pipe that penetrates the main body portion 11 of the housing 10. The end of the suction pipe 19 located inside the housing 10 is inserted into the suction hole 84b of the cylinder block 84. The end of the suction pipe 19 located outside the housing 10 is connected to the refrigerant circuit 6. The suction pipe 19 supplies refrigerant from the refrigerant circuit 6 to the compression mechanism 15.

[0111] (2-1-6) Discharge pipe

[0112] The discharge pipe 20 is a pipe that penetrates the top portion 12 of the housing 10. The end of the discharge pipe 20 located inside the housing 10 is in the space above the drive motor 16. The end of the discharge pipe 20 located outside the housing 10 is connected to the refrigerant circuit 6. The discharge pipe 20 supplies the refrigerant compressed by the compression mechanism 15 to the refrigerant circuit 6.

[0113] (2-1-7) Injection pipe

[0114] The injection pipe 92 is a pipe that penetrates the main body portion 11 of the housing 10. The end of the injection pipe 92 located inside the housing 10 is connected to the injection valve 93 disposed in the injection passage 84g of the cylinder block 84. The end of the injection pipe 92 located outside the housing 10 is connected to the energy-saving pipe 90. The injection pipe 92 supplies the refrigerant in the energy-saving pipe 90 to the injection passage 84g.

[0115] (2-1-8) Injection valve

[0116] The injection valve 93 performs intermediate injection and inhibits the reverse flow of refrigerant from the compression chamber 40 to the injection passage 84g. As Figure 5 and Figure 6As shown, the injection valve 93 mainly includes a valve body 94, a valve pressing member 95, and a valve seat 96. The valve pressing member 95 and the valve seat 96 are fixed to the cylinder block 84 by being press-fitted into the injection passage 84g. The valve pressing member 95 and the valve seat 96 are arranged so as to be separated from each other in a first direction D1 extending along the injection passage 84g. The space between the valve pressing member 95 and the valve seat 96 is a first space 97 as follows: the valve body 94 is accommodated in the first space 97 so as to be movable along the first direction D1. The first space 97 is a cylindrical space. The valve pressing member 95 is arranged at a position closer to the injection pipe 92 than the valve body 94. The valve seat 96 is arranged at a position closer to the compression chamber 40 than the valve body 94.

[0117] The injection passage 84g is a circular hole with an inner diameter that varies along the first direction D1. The injection passage 84g has the largest inner diameter at the end on the cylinder outer peripheral surface 86d side and the smallest inner diameter at the end on the cylinder inner peripheral surface 86c side. Specifically, the inner diameter of the injection passage 84g increases from the cylinder inner peripheral surface 86c side toward the cylinder outer peripheral surface 86d side.

[0118] The valve body 94 is a circular flat plate. The valve body 94 is formed of spring steel such as GIN6 (stainless steel quenched steel manufactured by Hitachi Metals, Ltd.). As Figure 8 shown, a circular second hole 94a is formed in the central portion of the valve body 94. The valve body 94 has an annular peripheral portion 94b located around the second hole 94a. In Figure 8 it, the peripheral portion 94b is shown as a shaded area. The valve body 94 is arranged in the first space 97 so as to be movable along the first direction D1.

[0119] The valve pressing member 95 is press-fitted on the cylinder outer peripheral surface 86d side of the injection passage 84g. The valve pressing member 95 has a shape with an outer diameter that varies along the first direction D1. A part of the valve pressing member 95 protrudes outward from the cylinder outer peripheral surface 86d. In the valve pressing member 95, the injection pipe 92 is inserted from the cylinder outer peripheral surface 86d side. The injection pipe 92 is fixed to the valve pressing member 95. As Figure 5 and Figure 6 shown, the injection passage 84g is separated from the high-pressure space HS by an O-ring 92a installed on the injection pipe 92. The valve pressing member 95 is formed with a first hole 95a, a closing portion 95b, and a buffer space 95c.

[0120] The first hole 95a is a hole through which the refrigerant passes and is closed by the valve body 94 when the refrigerant flows out from the compression chamber 40. The first hole 95a penetrates the valve pressing member 95 along the first direction D1. As Figure 9As shown, when observing the valve pressing member 95 along the first direction D1 from the inner peripheral surface 86c side of the cylinder block, the closing portion 95b is an annular region located at the center of the valve pressing member 95. A plurality of first holes 95a are formed around the closing portion 95b. The buffer space 95c is formed such that its center overlaps with the center of the closing portion 95b along the first direction D1. In Figure 9 , the closing portion 95b is shown as a shaded area. In Figure 9 In the valve pressing member 95 shown, twelve first holes 95a are arranged in a circular shape. The outer diameter of the closing portion 95b is larger than the diameter of the second hole 94a of the valve body 94. The diameter of the first hole 95a is smaller than the width of the peripheral portion 94b of the valve body 94 (the dimension in the radial direction of the valve body 94).

[0121] The buffer space 95c is a space formed to communicate with the first space 97 so that the refrigerant flowing from the compression chamber 40 into the first space 97 flows into the buffer space 95c before reaching the first hole 95a. The buffer space 95c is formed at a position closer to the injection pipe 92 than the second hole 94a. In the present embodiment, the buffer space 95c is a cylindrical recess formed on the surface of the closing portion 95b facing the valve body 94. The buffer space 95c is formed to be located on the central axis CL of the first space 97 together with the second hole 94a (see Figure 7 ).

[0122] In the present embodiment, the buffer space 95c is formed such that the area of the circular opening 95co facing the valve body 94 is smaller than the flow path area of the second hole 94a. The ratio of the area of the opening 95co of the buffer space 95c facing the valve body 94 to the flow path area of the second hole 94a is preferably 0.5 or more and 1.0 or less. The opening 95co is preferably formed such that the whole is exposed to the inner peripheral surface 86c side of the cylinder block through the second hole 94a. In other words, the opening 95co is preferably formed such that no overlapping region with the peripheral portion 94b is generated when observing along the first direction D1 from the inner peripheral surface 86c side of the cylinder block.

[0123] In addition, the ratio of the depth d of the buffer space 95c in the first direction D1 of the first space 97 (see Figure 7 ) to the length L of the first hole 95a in the first direction D1 is preferably 0.3 or more and 0.6 or less. In addition, the ratio of the volume of the first space 97 and the third hole 96a (described later) formed in the valve seat 96 to the volume of the buffer space 95c is preferably 0.2 or more and 0.8 or less.

[0124] The valve pressing member 95 restricts the movement of the valve body 94 toward the injection pipe 92 side. In other words, when moving toward the injection pipe 92 along the first direction D1, the valve body 94 can move until it abuts against the valve pressing member 95. In the state where the valve body 94 abuts against the valve pressing member 95, the first hole 95a of the valve pressing member 95 is blocked by the peripheral portion 94b of the valve body 94. At this time, the second hole 94a of the valve body 94 is blocked by the closing portion 95b of the valve pressing member 95. In the state where the valve body 94 is separated from the valve pressing member 95, the first hole 95a of the valve pressing member 95 is not blocked by the peripheral portion 94b of the valve body 94. At this time, the second hole 94a of the valve body 94 is not blocked by the closing portion 95b of the valve pressing member 95.

[0125] In this way, the first hole 95a of the valve pressing member 95 is opened and closed by the valve body 94. Specifically, in the state where the valve body 94 abuts against the valve pressing member 95, the second hole 94a of the valve body 94 and the first hole 95a of the valve pressing member 95 are blocked, so the injection valve 93 is in the closed state (refer to Figure 5 ). Therefore, the refrigerant in the injection pipe 92 cannot flow into the compression chamber 40 through the first hole 95a and the second hole 94a. On the other hand, in the state where the valve body 94 is separated from the valve pressing member 95, the second hole 94a of the valve body 94 and the first hole 95a of the valve pressing member 95 are not blocked, so the injection valve 93 is in the open state (refer to Figure 6 ). Therefore, the refrigerant in the injection pipe 92 can flow into the compression chamber 40 through the first hole 95a and the second hole 94a.

[0126] The valve seat 96 restricts the movement of the valve body 94 toward the compression chamber 40 side. The valve seat 96 is press-fitted on the inner peripheral surface 86c side of the cylinder body of the injection passage 84g. The valve seat 96 has a cylindrical shape with an outer diameter that is substantially constant along the first direction D1. The valve seat 96 has a third hole 96a. The third hole 96a penetrates the valve seat 96 along the first direction D1. The valve seat 96 communicates the first space 97 with the compression chamber 40. The third hole 96a includes an enlarged portion 96ae whose inner diameter expands from the compression chamber 40 side to the opening on the injection pipe 92 side. The minimum inner diameter of the third hole 96a is substantially the same as the inner diameter of the second hole 94a of the valve body 94. The maximum inner diameter of the third hole 96a, that is, the inner diameter of the opening of the enlarged portion 96ae, is larger than the inner diameter of the second hole 94a of the valve body 94. The third hole 96a is always communicated with the compression chamber 40 via the injection passage 84g.

[0127] When moving toward the compression chamber 40 along the first direction D1, the valve body 94 can move until it abuts against the valve seat 96. In the state where the valve body 94 abuts against the valve seat 96, the second hole 94a of the valve body 94 communicates with the third hole 96a of the valve seat 96. When the valve body 94 abuts against the valve seat 96, the valve body 94 is separated from the valve pressing member 95, so the injection valve 93 is in the open state (refer toFigure 6 )。

[0128] (2-2) Operation of the compressor

[0129] When the drive motor 16 is started, the eccentric shaft portion 17a of the crankshaft 17 eccentrically rotates about the rotation axis 17g of the crankshaft 17. As a result, the piston 81 connected to the eccentric shaft portion 17a revolves within the cylinder bore 84a of the cylinder block 84. During the revolution of the piston 81, the outer peripheral surface 81c of the piston contacts the inner peripheral surface 86c of the cylinder block. By the revolution of the piston 81, the vane 81b moves forward and backward while being sandwiched between its two side surfaces by the bushings 82.

[0130] As the piston 81 revolves, the volume of the compression chamber 40 (low-pressure chamber 40a) communicating with the suction hole 84b gradually increases. At this time, the low-pressure refrigerant flows from the outside of the housing 10 into the low-pressure chamber 40a via the suction pipe 19. Along with the revolution of the piston 81, the low-pressure chamber 40a becomes the high-pressure chamber 40b communicating with the discharge notch 84c, and the volume of the high-pressure chamber 40b gradually decreases and disappears. After that, a new low-pressure chamber 40a is formed. Thus, the low-pressure refrigerant flowing from the suction pipe 19 into the low-pressure chamber 40a via the suction hole 84b is compressed in the compression chamber 40 (high-pressure chamber 40b). During the period when the refrigerant is compressed in the compression chamber 40, the vane 81b is held so as to be able to move forward and backward between the pair of bushings.

[0131] The high-pressure refrigerant compressed in the high-pressure chamber 40b is discharged to the high-pressure space HS via the discharge notch 84c and the discharge port 23b. The refrigerant discharged to the high-pressure space HS flows upward through the motor cooling passage of the drive motor 16 and then is discharged from the discharge pipe 20 to the outside of the housing 10.

[0132] (2-3) Intermediate injection

[0133] Intermediate injection is performed by supplying the intermediate-pressure refrigerant from the injection passage 84g to the high-pressure chamber 40b in a state where the injection valve 93 is open. Intermediate injection is performed when the pressure in the compression chamber 40 (high-pressure chamber 40b) is lower than the intermediate pressure, and is not performed when the pressure in the compression chamber 40 (high-pressure chamber 40b) is equal to or higher than the intermediate pressure.

[0134] During the revolution of the piston 81, as described below, the injection valve 93 repeatedly opens and closes.

[0135] As Figure 10As shown, when the piston 81 is at the top dead center, the entire vane 81b is supported by a pair of bushings 82. At this time, the compression chamber 40 is not divided into a low-pressure chamber 40a and a high-pressure chamber 40b by the piston 81, and the compression chamber 40 communicates with both the suction hole 84b and the injection passage 84g. Therefore, the compression chamber 40 is filled with low-pressure refrigerant flowing in from the suction hole 84b. Since the pressure in the compression chamber 40 is lower than the intermediate pressure, the valve body 94 moves toward the valve seat 96 by the intermediate pressure and abuts against the valve seat 96. As a result, the injection valve 93 opens and intermediate injection is performed (refer to Figure 6 ).

[0136] When the piston 81 revolves from the Figure 10 state shown, as Figure 11 shown, the piston 81 closes the opening of the suction hole 84b in the inner peripheral surface 86c of the cylinder block. At this time, the compression chamber 40 is divided into a low-pressure chamber 40a and a high-pressure chamber 40b by the piston 81, and the high-pressure chamber 40b communicates with the injection passage 84g. After that, when the piston 81 further revolves and the pressure in the high-pressure chamber 40b rises, the pressure in the high-pressure chamber 40b becomes equal to or higher than the intermediate pressure. Thus, by the pressure in the high-pressure chamber 40b, the valve body 94 moves toward the valve pressing member 95 and abuts against the valve pressing member 95. As a result, the injection valve 93 closes and the intermediate injection ends (refer to Figure 5 ).

[0137] The refrigerant in the compression chamber 40 (high-pressure chamber 40b) flows into the first space 97 just before the intermediate injection ends. As shown by the arrow in Figure 7 , at least a part of the refrigerant flowing into the first space 97 flows into the buffer space 95c before reaching the first hole 95a through the second hole 94a of the valve body 94. Thus, a time lag occurs during the period from when the refrigerant flows into the first space 97 until it reaches the first hole 95a. The valve body 94 that abuts against the valve seat 96 during the intermediate injection can move toward the valve pressing member 95 during this time lag and block the first hole 95a of the valve pressing member 95.

[0138] In addition, as described above, the inner diameter of the opening of the enlarged portion 96ae formed in the third hole 96a is formed to be larger than the inner diameter of the second hole 94a formed in the valve body 94. Thus, a part of the refrigerant flowing from the compression chamber 40 into the third hole 96a collides with the periphery of the second hole 94a, and therefore, the valve body 94 can reliably move toward the valve pressing member 95 to block the first hole 95a of the valve pressing member 95.

[0139] Next, when the piston 81 further revolves, as Figure 12As shown, the piston 81 closes the opening of the injection passage 84g in the inner peripheral surface 86c of the cylinder block. At this time, the compression chamber 40 is divided into a low-pressure chamber 40a and a high-pressure chamber 40b by the piston 81, and the low-pressure chamber 40a communicates with the suction hole 84b. Therefore, the low-pressure chamber 40a is filled with the low-pressure refrigerant flowing in from the suction hole 84b. After that, when the piston 81 further rotates and the low-pressure chamber 40a communicates with the injection passage 84g, the pressure in the low-pressure chamber 40a is lower than the intermediate pressure. Therefore, the valve body 94 moves toward the valve seat 96 by the intermediate pressure and abuts against the valve seat 96. As a result, the injection valve 93 opens and intermediate injection is performed (refer to Figure 6 ). After that, when the piston 81 further rotates, as shown in Figure 10 , the piston 81 is at the top dead center.

[0140] As described above, during the rotation of the piston 81, the injection valve 93 opens and closes due to the pressure difference between the refrigerant in the compression chamber 40 and the intermediate-pressure refrigerant in the injection pipe 92. As a result, when the pressure in the compression chamber 40 is lower than the intermediate pressure in the injection pipe 92, the injection valve 93 opens and intermediate injection is performed. In addition, when the pressure in the compression chamber 40 is equal to or higher than the intermediate pressure, the injection valve 93 closes and no intermediate injection is performed.

[0141] In this way, the injection valve 93 can perform intermediate injection and can suppress the outflow of the refrigerant from the compression chamber 40 to the injection passage 84g when no intermediate injection is performed. Therefore, a sufficient amount of intermediate-pressure refrigerant is supplied to the compression chamber 40 during the operation of the compressor 21. Therefore, the compressor 21 can obtain a higher compression ratio than in the case where there is no injection valve 93.

[0142] (3) Features

[0143] (3-1)

[0144] The compressor 21 includes a compression mechanism 15, an injection valve 93, and an injection pipe 92. The compression mechanism 15 has a compression chamber 40 that compresses the refrigerant. The injection valve 93 is disposed in the injection passage 84g that communicates with the compression chamber 40. The injection pipe 92 supplies the refrigerant to the injection passage 84g.

[0145] The injection valve 93 includes a valve body 94, a valve pressing member 95, and a valve seat 96. The valve body 94 is configured to be movable along the first direction D1. The valve pressing member 95 is disposed on the side closer to the injection pipe 92 than the valve body 94 and restricts the movement of the valve body 94 toward the injection pipe 92. The valve seat 96 is disposed on the side closer to the compression chamber 40 than the valve body 94 and restricts the movement of the valve body 94 toward the compression chamber 40. The valve pressing member 95 is formed with a first hole 95a through which the refrigerant passes, and when the refrigerant flows out from the compression chamber 40, the first hole 95a is closed by the valve body 94. The valve body 94 is formed with a second hole 94a through which the refrigerant passes.

[0146] The compressor 21 is formed with a buffer space 95c which communicates with a first space 97 in which a valve body 94 is received between a valve pressing member 95 and a valve seat 96, and the refrigerant flowing from the compression chamber 40 into the first space 97 flows into the buffer space 95c before reaching the first hole 95a.

[0147] As in the case of the compressor 21, an injection valve 93 that operates a plate-shaped valve body 94 using the pressure difference between the compression chamber 40 and the injection passage 84g has a simpler structure than a check valve that operates the valve body 94 using a spring member. On the other hand, due to its weight and shape, it is possible that the valve body 94 cannot move rapidly inside the first space 97, and high-pressure refrigerant flows out from the compression chamber 40 to the injection passage 84g before the intermediate injection is about to end, and a high compression ratio cannot be achieved.

[0148] In the compressor 21, at least a part of the refrigerant flowing into the first space 97 before the intermediate injection is about to end flows into the buffer space 95c before reaching the first hole 95a. As a result, a time lag occurs during the period from when the refrigerant flows into the first space 97 until it reaches the first hole 95a. The valve body 94 in contact with the valve seat 96 during the intermediate injection moves toward the valve pressing member 95 during this time lag and closes the first hole 95a of the valve pressing member 95, and it is possible to suppress the outflow of the refrigerant from the compression chamber 40 to the injection passage 84g.

[0149] In this way, the compressor 21 has a simple structure in which the injection valve 93 does not use a spring member, and suppresses the outflow of the refrigerant from the compression chamber 40 to the injection passage 84g before the intermediate injection is about to end, and thus a high compression efficiency can be obtained.

[0150] (3-2)

[0151] The buffer space 95c is formed at a position closer to the injection pipe 92 side than the second hole 94a.

[0152] (3-3)

[0153] The buffer space 95c is a recess formed in the surface of the valve pressing member 95 facing the valve body 94.

[0154] (3-4)

[0155] The first space 97 is cylindrical. The valve body 94 is a circular flat plate having a second hole 94a formed at the center. The buffer space 95c and the second hole 94a are located on the central axis CL of the first space 97.

[0156] Accordingly, the buffer space 95c and the second hole 94a are located on the central axis CL. Therefore, most of the refrigerant that has passed through the second hole 94a can flow into the buffer space 95c, effectively suppressing the outflow of the refrigerant from the compression chamber 40.

[0157] (3-5)

[0158] The ratio of the area of the opening 95co of the buffer space 95c facing the valve body 94 to the flow path area of the second hole 94a is 0.5 or more and 1.0 or less.

[0159] Accordingly, most of the refrigerant that has passed through the second hole 94a can flow into the buffer space 95c. Therefore, the outflow of the refrigerant from the compression chamber 40 is effectively suppressed.

[0160] (3-6)

[0161] The ratio of the depth d of the buffer space 95c in the first direction D1 of the first space 97 to the length L of the first hole 95a in the first direction D1 is 0.3 or more and 0.6 or less.

[0162] Accordingly, most of the refrigerant that has passed through the second hole 94a can flow into the buffer space 95c. Therefore, a time lag is reliably generated from when the refrigerant flows into the first space 97 until it reaches the first hole 95a, effectively suppressing the outflow of the refrigerant from the compression chamber 40.

[0163] (3-7)

[0164] The valve seat 96 is formed with a third hole 96a that communicates the first space 97 with the compression chamber 40. The ratio of the volume of the first space 97 and the third hole 96a to the volume of the buffer space 95c is 0.2 or more and 0.8 or less.

[0165] Accordingly, most of the refrigerant flowing into the first space 97 can flow into the buffer space 95c. Therefore, a time lag is reliably generated from when the refrigerant flows into the first space 97 until it reaches the first hole 95a, effectively suppressing the outflow of the refrigerant from the compression chamber 40.

[0166] (3-8)

[0167] The air conditioner 1 includes a compressor 21.

[0168] The air conditioner 1 includes a compressor 21 with high compression efficiency, and thus can perform efficient air-conditioning operation.

[0169] (4) Variation

[0170] The injection valve 93 can also be applied to compressors other than rotary compressors. For example, the injection valve 93 can also be applied to scroll compressors.

[0171] -Summary-

[0172] As described above, the embodiments of the present disclosure have been described. However, it should be understood that various changes in the mode and details can be made without departing from the gist and scope of the present disclosure described in the claims.

[0173] Reference Numeral Explanation

[0174] 1 Air conditioner

[0175] 15 Compression mechanism

[0176] 21 Compressor

[0177] 40 Compression chamber

[0178] 84g Injection passage

[0179] 92 Injection pipe

[0180] 93 Injection valve

[0181] 94 Valve body

[0182] 94a Second hole

[0183] 95 Valve pressing member

[0184] 95a First hole

[0185] 95c Buffer space

[0186] 95co Opening of the buffer space

[0187] 96 Valve seat

[0188] 96a Third hole

[0189] 97 First space

[0190] CL Central axis of the first space

[0191] d Depth of the buffer space in the first direction

[0192] L Length of the first hole in the first direction D1

[0193] D1 First direction

[0194] Prior Art Documents

[0195] Patent Documents

[0196] Patent Document 1: International Publication No. 2017 / 221571

Claims

1. A compressor (21), comprising: A compression mechanism (15) having a compression chamber (40) for compressing a refrigerant; An injection valve (93) disposed in an injection passage (84g) communicating with the compression chamber; and An injection pipe (92) for supplying the refrigerant to the injection passage, The injection valve has: A valve body (94) configured to be movable along a first direction (D1); A valve pressing member (95) disposed on the side of the injection pipe with respect to the valve body, restricting the movement of the valve body toward the injection pipe side; and A valve seat (96) disposed on the side of the compression chamber with respect to the valve body, restricting the movement of the valve body toward the compression chamber side, The valve pressing member is formed with a first hole (95a) through which the refrigerant passes, The valve body is formed with a second hole (94a) through which the refrigerant passes, The compressor (21) is formed with a buffer space (95c) communicating with a first space (97) in which the valve body is received between the valve pressing member and the valve seat, and allowing the refrigerant flowing from the compression chamber into the first space to flow in, When viewed along the first direction, an opening (95co) of the buffer space facing the valve body does not overlap with a circumferential peripheral portion (94b) of the valve body around the second hole.

2. A compressor, comprising: A compression mechanism (15) having a compression chamber (40) for compressing a refrigerant; An injection valve (93) disposed in an injection passage (84g) communicating with the compression chamber; and An injection pipe (92) for supplying the refrigerant to the injection passage, The injection valve has: A valve body (94) configured to be movable along a first direction (D1); and A valve pressing member (95) disposed on the side of the injection pipe with respect to the valve body, restricting the movement of the valve body toward the injection pipe side; and A valve seat (96) disposed on the side of the compression chamber with respect to the valve body, restricting the movement of the valve body toward the compression chamber side, The valve pressing member is formed with a first hole (95a) through which the refrigerant passes. When the refrigerant flows out of the compression chamber, the first hole (95a) is closed by the valve body. The valve body is formed with a second hole (94a) through which the refrigerant passes. The compressor (21) is formed with a buffer space (95c). The buffer space (95c) communicates with a first space (97) in which the valve body is received between the valve pressing member and the valve seat. The refrigerant flowing from the compression chamber into the first space flows into the buffer space (95c) before reaching the first hole. When viewed along the first direction, the opening (95co) of the buffer space facing the valve body does not overlap with the annular peripheral portion (94b) of the valve body located around the second hole.

3. The compressor according to claim 1 or 2, wherein The buffer space is formed at a position closer to the injection pipe side than the second hole.

4. The compressor according to claim 1 or 2, wherein The buffer space is a recess formed in the surface of the valve pressing member facing the valve body.

5. The compressor according to claim 1 or 2, wherein The first space is cylindrical. The valve body is a circular flat plate having the second hole formed at the center. The buffer space and the second hole are located on the central axis (CL) of the first space.

6. The compressor according to claim 1 or 2, wherein The ratio of the area of the opening (95co) of the buffer space facing the valve body to the flow path area of the second hole is 0.5 or more and 1.0 or less.

7. The compressor according to claim 1 or 2, wherein The ratio of the depth (d) of the buffer space in the first direction of the first space to the length (L) of the first hole in the first direction is 0.3 or more and 0.6 or less.

8. The compressor according to claim 1 or 2, wherein The valve seat is formed with a third hole (96a) that communicates the first space with the compression chamber. The ratio of the volumes of the first space and the third hole to the volume of the buffer space is 0.2 or more and 0.8 or less.

9. A compressor (40) comprising: A compression chamber (40) for compressing the refrigerant; and A valve (93) disposed in an injection passage communicating with the compression chamber, The valve (93) has: A valve body (94) received in a first space (97) and formed with a second hole (94a); A valve pressing member (95) formed with a first hole (95a) communicating with the first space and partitioning the first space; and A valve seat (96) is formed with a third hole (96a) communicating with the first space and divides the first space. The valve pressing member is formed with a recess, which is a buffer space (95c) having an opening provided on the surface of the valve pressing member facing the first space. When observed in the first direction (D1) along the injection passage, the opening (95co) of the buffer space facing the valve body does not overlap with the annular peripheral portion (94b) of the valve body located around the second hole.

10. The compressor according to claim 9, wherein The valve body is a circular flat plate formed with a second hole. The first space is cylindrical. The recess and the second hole are located on the central axis (CL) of the first space.

11. The compressor according to claim 9, wherein The buffer space is a space into which the refrigerant flowing into the first space flows.

12. An air conditioning apparatus comprising the compressor according to any one of claims 1, 2, 9 to 11.

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