Closed-type compressors and refrigeration cycle systems

Abstract

This hermetic compressor is provided with: a cylinder provided with a compression chamber for compressing a refrigerant, an injection vertical hole extending in the height direction and constituting a part of an injection flow path for supplying the refrigerant into the compression chamber, and a communication part for connecting the injection vertical hole and the compression chamber; and blocking members respectively fixed to both height-direction end faces of the cylinder and blocking the compression chamber. The blocking member fixed to one of the end faces of the cylinder has a discharge port for discharging the compressed refrigerant to the outside of the compression chamber, and in a plan view, a straight line connecting the center of the injection vertical hole and the center of the boundary of the communication part with the inner periphery of the cylinder passes through an area where the discharge port is projected in the height direction of the cylinder.

Description

Technical Field

[0001] The present disclosure relates to a hermetic compressor having an injection mechanism and a refrigeration cycle device.

Background Art

[0002] Conventional hermetic compressors mount a motor composed of a rotor and a stator at the upper part inside a hermetic container, and the rotation of the motor is transmitted to the mechanical part below by a crankshaft fixed to the rotor. The mechanical part mainly consists of a cylinder, a main bearing, a sub-bearing, an intermediate plate, and a piston. The eccentric-shaped crankshaft rotates to eccentrically rotate the piston, reducing the volume of the compression chamber to compress the refrigerant.

[0003] Also, among the main bearing, the sub-bearing, and the intermediate plate, injection holes are formed in one or more of them so as to communicate with the compression chamber, and medium-pressure liquid or gaseous refrigerant is injected into the compression chamber from an injection pipe that is press-fitted or welded. By adding this injection refrigerant, the refrigerant flow rate discharged from the rotary compressor increases, and the capacity of the refrigeration cycle increases. Further, by cooling the compression mechanism part with the injection refrigerant, compressor failures can be suppressed and reliability can be improved. In order to reduce the deterioration of the efficiency of the compressor due to the reverse flow of the compressed refrigerant into the injection flow path, some have a check valve in the middle of the injection flow path (for example, see Patent Document 1).

Prior Art Documents

Patent Documents

[0004]

Patent Document 1

Summary of the Invention

Problems to be Solved by the Invention

[0005] In a closed-type compressor having an injection mechanism that injects an intermediate-pressure refrigerant as an injection refrigerant into the compression chamber, such as in Patent Document 1, the areas cooled by the injection refrigerant and the areas heated by the compressed high-temperature, high-pressure refrigerant are unevenly distributed within the compression mechanism. If the areas heated by the compressed high-temperature, high-pressure refrigerant are not cooled and become overheated, this can cause compressor failure and lead to a deterioration in reliability.

[0006] This disclosure was made to solve the above-mentioned problems and aims to provide a closed-type compressor and refrigeration cycle system that suppress the deterioration of reliability. [Means for solving the problem]

[0007] The sealed compressor according to this disclosure comprises a compression chamber for compressing a refrigerant, a cylinder having a vertical injection hole extending in the height direction that constitutes part of an injection flow path for supplying refrigerant into the compression chamber, and a communication portion that connects the vertical injection hole and the compression chamber, and closure members fixed to both ends of the cylinder in the height direction and closing the compression chamber, wherein the closure member fixed to one end of the cylinder has a discharge port for discharging the compressed refrigerant out of the compression chamber, and in plan view, the injection A straight line connecting the center of the injection vertical hole and the center of the boundary between the communication portion and the inner circumference of the cylinder passes through a region obtained by projecting the discharge port in the height direction of the cylinder, and is equipped with an injection check valve that opens and closes the injection vertical hole, and an injection check valve operating groove is formed on the other end face of the cylinder in the height direction, and in plan view, the width of the boundary between the communication portion and the inner circumference of the cylinder is greater than the width of the boundary between the communication portion and the injection check valve operating groove. The communication section has a pair of communication section wall surfaces, and the distance between each of the pair of communication section wall surfaces and the center of the flow path of the communication section is longer as it approaches the inner circumference of the cylinder. It is.

[0008] Furthermore, the sealed compressor according to this disclosure comprises an electric motor having a stator and a rotor; a cylinder having a compression chamber for compressing a refrigerant, a vertical injection hole extending in the height direction that constitutes part of an injection flow path for supplying refrigerant into the compression chamber, and a communication portion that connects the vertical injection hole and the compression chamber; a rotating shaft provided in the compression chamber and having an eccentric shaft portion that performs eccentric motion within the compression chamber, and which is rotated by the electric motor; a rolling piston provided on the eccentric shaft portion; vanes that divide the space formed by the inner circumference of the cylinder and the outer circumference of the rolling piston into an intake side and a compression side; and closure members fixed to both ends of the cylinder in the height direction and closing the compression chamber, wherein the closure member fixed to one end face of the cylinder is The device has a discharge port for discharging compressed refrigerant outside the compression chamber, and in plan view, the straight line connecting the center of the injection vertical hole and the center of the boundary between the communication portion and the inner circumference of the cylinder passes through a region formed by the inner circumference of the cylinder, the outer circumference of the rolling piston and the vane at the phase of the rolling piston where the pressure of the refrigerant in the compression chamber and the pressure of the refrigerant discharged from the discharge port coincide, and is equipped with an injection check valve that opens and closes the injection vertical hole, and an injection check valve operating groove is formed on the other end face in the height direction of the cylinder where the injection check valve is located, and in plan view, the width of the boundary between the communication portion and the inner circumference of the cylinder is greater than the width of the boundary between the communication portion and the injection check valve operating groove. The communication section has a pair of communication section wall surfaces, and the distance between each of the pair of communication section wall surfaces and the center of the flow path of the communication section is longer as it approaches the inner circumference of the cylinder. It is.

[0009] Alternatively, the sealed compressor according to the present disclosure comprises a compression chamber for compressing a refrigerant, a vertical injection hole extending in the height direction that constitutes part of an injection flow path for supplying refrigerant into the compression chamber, and a cylinder having a communication portion that connects the vertical injection hole and the compression chamber, and closure members fixed to both ends of the cylinder in the height direction and closing the compression chamber, wherein the closure member fixed to one end face of the cylinder has a discharge port for discharging the compressed refrigerant out of the compression chamber, and a discharge notch is formed on the inner circumference of the cylinder by cutting out a part of one end face of the cylinder, and in plan view, the center of the vertical injection hole and the A straight line connecting the center of the boundary between the communication portion and the inner circumference of the cylinder passes through the region obtained by projecting the discharge notch in the height direction of the cylinder, when the communication portion and the discharge notch are projected onto the same plane in the height direction and are positioned so that at least a portion of them overlap, and an injection check valve that opens and closes the injection vertical hole is provided, and an injection check valve operating groove where the injection check valve is located is formed on the other end face of the cylinder in the height direction, and in plan view, the width of the boundary between the communication portion and the inner circumference of the cylinder is greater than the width of the boundary between the communication portion and the injection check valve operating groove. The communication section has a pair of communication section wall surfaces, and the distance between each of the pair of communication section wall surfaces and the center of the flow path of the communication section is longer as it approaches the inner circumference of the cylinder. It is.

[0010] Furthermore, the refrigeration cycle system relating to this disclosure is equipped with the above-mentioned sealed compressor. [Effects of the Invention]

[0011] According to the sealed compressor and refrigeration cycle device of this disclosure, the cylinder has injection vertical holes and communication sections that constitute part of the injection flow path. In a plan view, the straight line connecting the center of the injection vertical hole and the center of the boundary between the communication section and the inner circumference of the cylinder passes through a region projected from the discharge port in the height direction of the cylinder, or passes through a region formed by the inner circumference of the cylinder, the outer circumference of the rolling piston, and the vane at the phase of the rolling piston where the pressure of the refrigerant in the compression chamber and the pressure of the refrigerant discharged from the discharge port coincide, or passes through a region projected from the discharge section in the height direction of the cylinder when the communication section and the discharge notch are positioned to overlap in at least a portion. With the injection vertical holes and communication sections arranged in this way, the relatively low-temperature injected refrigerant passes through the high-temperature areas in regions that become hot when heated by the compressed high-temperature, high-pressure refrigerant, thereby cooling the high-temperature areas. As a result, overheating of the high-temperature areas is suppressed, and deterioration of reliability can be suppressed. [Brief explanation of the drawing]

[0012] [Figure 1] This is a schematic diagram showing a longitudinal cross-section of a sealed compressor according to an embodiment. [Figure 2] This is a schematic plan view of the compression mechanism when the sealed compressor shown in Figure 1 is cut along line AA, as seen in the direction of the arrow. [Figure 3] This is a schematic plan view of the compression mechanism when the sealed compressor shown in Figure 1 is cut at BB, as seen in the direction of the arrow. [Figure 4] Figure 1 is a schematic diagram showing an enlarged view of the section of a sealed compressor viewed through arrow C. [Figure 5] Figure 2 is a schematic longitudinal cross-sectional view of the cylinder as seen in the direction of the arrow when the compression mechanism section is cut with a DD. [Figure 6] This is a schematic diagram showing a longitudinal cross-section of a modified example of a sealed compressor according to the embodiment. [Figure 7] This is a schematic plan view showing an enlarged view of the area around the injection vertical hole and communication section of a sealed compressor according to an embodiment. [Figure 8] It is a schematic plan view showing a first region obtained by projecting a discharge port of a hermetic compressor according to an embodiment in the height direction of a cylinder. [Figure 9] It is a schematic plan view showing a second region formed by an inner circumference of a cylinder of a hermetic compressor according to an embodiment, an outer circumference of a rolling piston, and a vane. [Figure 10] It is a schematic plan view showing a third region obtained by projecting a discharge notch of a hermetic compressor according to an embodiment in the height direction of a cylinder. [Figure 11] It is a schematic configuration diagram of a refrigeration cycle device including a hermetic compressor according to an embodiment.

Embodiments for Carrying Out the Invention

[0013] Hereinafter, embodiments of the present disclosure will be described based on the drawings. Note that the present disclosure is not limited by the embodiments described below. Also, in the following drawings, the relationship of the sizes of each component may be different from the actual one.

[0014] Embodiment. FIG. 1 is a schematic diagram showing a longitudinal section of a hermetic compressor 100 according to an embodiment. FIG. 2 is a schematic plan view of a compression mechanism portion 20 when the hermetic compressor 100 of FIG. 1 is cut along A-A, viewed in the arrow direction. FIG. 3 is a schematic plan view of the compression mechanism portion 20 when the hermetic compressor 100 of FIG. 1 is cut along B-B, viewed in the arrow direction. FIG. 4 is an enlarged schematic diagram of a C-arrow-view portion of the hermetic compressor 100 of FIG. 1. FIG. 5 is a longitudinal-sectional schematic view of a cylinder 23 when the compression mechanism portion 20 of FIG. 2 is cut along D-D, viewed in the arrow direction. FIG. 6 is a schematic diagram showing a longitudinal section of a modified example of the hermetic compressor 100 according to an embodiment.

[0015] The hermetic compressor 100 according to the embodiment uses a single-cylinder rotary compressor having one cylinder 23 as shown in FIG. 1, that is, a single rotary compressor. Hereinafter, the overall configuration of the hermetic compressor 100, which is a single rotary compressor, will be described.

[0016] As shown in Fig. 1, the hermetic compressor 100 includes a compression mechanism portion 20 that compresses refrigerant gas and an electric motor 30 that drives the compression mechanism portion 20 within a hermetic container 10. The hermetic container 10 is composed of an upper container 11 and a lower container 12. The compression mechanism portion 20 is housed below the hermetic container 10, and the electric motor 30 is housed above the hermetic container 10. The electric motor 30 is composed of a stator 31 and a rotor 32. The compression mechanism portion 20 and the electric motor 30 are connected by a rotating shaft 21 that extends in the vertical direction. The rotating shaft 21 transmits the rotational motion of the electric motor 30 to the compression mechanism portion 20, and in the compression mechanism portion 20, the refrigerant gas is compressed by the transmitted rotational force and discharged into the hermetic container 10. The inside of the hermetic container 10 is filled with the compressed high-temperature and high-pressure refrigerant gas, and refrigerant oil is stored at the bottom 10a of the hermetic container 10 for lubricating the compression mechanism portion 20. An oil pump (not shown) is provided at the lower part of the rotating shaft 21. The oil pump pumps up the refrigerant oil stored at the bottom 10a of the hermetic container 10 as the rotating shaft 21 rotates and supplies oil to each sliding portion of the compression mechanism portion 20. Thereby, the mechanical lubrication action of the compression mechanism portion 20 is ensured.

[0017] The rotating shaft 21 is composed of a main shaft portion 21a, an eccentric shaft portion 21b, and a sub-shaft portion 21c, and is formed in the order of the main shaft portion 21a, the eccentric shaft portion 21b, and the sub-shaft portion 21c from top to bottom in the axial direction. The electric motor 30 is shrink-fitted or press-fitted and fixed to the main shaft portion 21a, and a cylindrical rolling piston 22 is slidably fitted to the eccentric shaft portion 21b.

[0018] As shown in Figs. 1 to 3, the compression mechanism portion 20 includes a rolling piston 22, a cylinder 23, an upper bearing 24, a lower bearing 25, and a vane 26. Inside the cylinder 23, a compression chamber 23a, which is a cylindrical space with both ends open in the axial direction, is formed. Inside the compression chamber 23a, there are housed an eccentric shaft portion 21b of the rotating shaft 21 that performs eccentric motion within the compression chamber 23a, a rolling piston 22 fitted to the eccentric shaft portion 21b, and a vane 26 that partitions the space formed by the inner circumference of the cylinder 23 and the outer circumference of the rolling piston 22 into a suction side where refrigerant is inhaled and a compression side where refrigerant is compressed.

[0019] The cylinder 23 has a vane groove 23c that extends radially and penetrates axially. One radial end of the vane groove 23c opens into the compression chamber 23a, and the other radial end has a back pressure chamber 23b. A vane 26 is housed in the vane groove 23c. The vane 26 reciprocates radially within the vane groove 23c. The shape of the vane 26 is that of a roughly rectangular parallelepiped, where the circumferential thickness of the compression chamber 23a is smaller than the radial and axial lengths of the compression chamber 23a when mounted in the vane groove 23c. A vane spring (not shown) is provided in the back pressure chamber 23b of the vane groove 23c.

[0020] Normally, the high-pressure refrigerant gas in the sealed container 10 flows into the back pressure chamber 23b, and the pressure difference between the refrigerant gas pressure in the back pressure chamber 23b and the refrigerant gas pressure in the compression chamber 23a creates a force that moves the vane 26 radially toward the center of the compression chamber 23a. This force due to the pressure difference between the refrigerant gas pressure in the back pressure chamber 23b and the refrigerant gas pressure in the compression chamber 23a, along with the radial pressing force of the vane spring, moves the vane 26 radially toward the center of the compression chamber 23a. The force that moves the vane 26 radially causes one end of the vane 26, i.e., the end on the compression chamber 23a side, to come into contact with the cylindrical outer circumference of the rolling piston 22. This allows the space formed by the inner circumference of the cylinder 23 and the outer circumference of the rolling piston 22 to be partitioned. Even if the pressure difference between the refrigerant gas in the sealed container 10, i.e., the refrigerant gas in the back pressure chamber 23b and the refrigerant gas in the compression chamber 23a, is not sufficient to press the vane 26 against the outer circumference of the rolling piston 22, the force of the vane spring can still press one end of the vane 26 against the outer circumference of the rolling piston 22. Therefore, one end of the vane 26 can always be in contact with the outer circumference of the rolling piston 22.

[0021] As shown in Figure 1, the upper bearing 24 has a substantially inverted T-shape when viewed from the side, and is fitted onto the main shaft portion 21a of the rotating shaft 21 to rotatably support the main shaft portion 21a, while also closing one axial opening of the compression chamber 23a. Similarly, the lower bearing 25 has a substantially T-shape when viewed from the side, and is fitted onto the sub-shaft portion 21c of the rotating shaft 21 to rotatably support the sub-shaft portion 21c, while also closing the other axial opening of the compression chamber 23a. The upper bearing 24 is also provided with a discharge port 24b for discharging the refrigerant gas compressed in the compression chamber 23a to the outside of the compression chamber 23a. As shown in Figure 2, the cylinder 23 is provided with an intake port 23e for drawing low-pressure refrigerant gas into the compression chamber 23a from outside the sealed container 10. Furthermore, as shown in Figures 2 and 5, the cylinder 23 has a discharge notch 23d to prevent the refrigerant flow path communicating with the discharge port 24b from undergoing abrupt contraction and bending. This discharge notch 23d is formed by cutting out a portion of the inner circumference of the upper end surface of the cylinder 23.

[0022] As shown in Figure 1, the upper bearing 24 is provided with a long discharge valve 24a that closes or opens the discharge port 24b. One end of the discharge valve 24a is provided with a fixed portion that is fixed by a fixing member (not shown), and the other end of the discharge valve 24a is provided with a circular head that closes or opens the discharge port 24b. The discharge valve 24a is an on / off valve that lifts within the upper bearing 24 and operates as a leaf spring, closing or opening the discharge port 24b with its head. In this way, it controls the discharge timing of the high-temperature, high-pressure refrigerant gas that is discharged from the compression chamber 23a to the outside of the compression chamber 23a via the discharge port 24b. That is, the discharge valve 24a closes the discharge port 24b with its head until the refrigerant gas compressed in the compression chamber 23a of the cylinder 23 reaches a predetermined pressure, and when the pressure exceeds the predetermined pressure, it opens the discharge port 24b to discharge the high-temperature, high-pressure refrigerant gas to the outside of the compression chamber 23a. The upper bearing 24 is also referred to as the closing member.

[0023] Here, the sealed compressor 100 according to the embodiment may use a rotary compressor having multiple cylinders 23 instead of the single rotary compressor described above. In the case of a twin rotary compressor having two cylinders 23 as shown in Figure 6, the compression mechanism 20 includes an intermediate plate 28 in addition to the rolling piston 22, cylinders 23, upper bearing 24, lower bearing 25, and vanes 26 described above, and a discharge port 24b and a discharge valve 24a are provided on the lower bearing 25, similar to the upper bearing 24. In this case, the upper bearing 24 and the lower bearing 25 are also referred to as closing members. Furthermore, an intake port 23e is provided on each of the two cylinders 23. That is, one intake port 23e and one discharge port 24b are provided on each cylinder 23.

[0024] As shown in Figures 2 to 4, the cylinder 23 has a radially extending injection lateral hole 70, and an injection piping connection part 71 communicating with the injection lateral hole 70 is formed on its radially outer side. The injection piping 107 is connected to the injection piping connection part 71. The cylinder 23 also has an injection vertical hole 72 extending in the height direction (or axial direction), and the injection vertical hole 72 is formed near the radially inner end of the injection lateral hole 70. Hereinafter, the injection lateral hole 70 and the injection vertical hole 72 will be collectively referred to as the injection hole. This injection hole constitutes part of the injection flow path through which the injected refrigerant flows from the injection piping 107 into the compression chamber 23a. Here, the end of the injection lateral hole 70 on the compression chamber 23a side is located on the outer circumference side of the cylinder 23 rather than the inner circumference, and is separated from the compression chamber 23a. Therefore, the injection lateral hole 70 does not communicate with the compression chamber 23a. A conical tip hole 70a is formed at the radially inward tip of the injection lateral hole 70. An injection check valve operating groove 77 is formed on one end face in the height direction of the cylinder 23 and on the inner circumference side of the cylinder 23. This injection check valve operating groove 77 is open on the inner circumference side of the cylinder 23 toward the center of the cylinder 23. The injection vertical hole 72 has one axial end communicating with the injection lateral hole 70 and the other end communicating with the injection check valve operating groove 77. In other words, the injection vertical hole 72 reaches one end face in the height direction of the cylinder 23. Here, the injection vertical hole 72 may also communicate with the tip hole 70a. If the injection vertical hole 72 and the tip hole 70a are not in communication, the injection vertical hole 72 must be positioned on the outer circumference side of the cylinder 23, which restricts the placement of the injection check valve 74. However, by making the injection vertical hole 72 and the tip hole 70a in communication, the injection vertical hole 72 can be positioned on the central side of the cylinder 23, reducing the constraints on the placement of the injection check valve 74.

[0025] The injection check valve operating groove 77 is provided with an elongated injection check valve 74 and an elongated injection check valve lift amount control plate 75. One end of the injection check valve 74 is provided with a fixed portion which will be fixed by a fixing member 76 described later, and the other end of the injection check valve 74 is provided with a circular head which closes or opens the injection vertical hole 72. The injection check valve 74 is an on / off valve that is lifted in the injection check valve operating groove 77 and operates as a leaf spring, closing or opening the injection vertical hole 72 with its head. In this way, it controls the injection timing of the injection refrigerant that flows from the injection piping 107 into the compression chamber 23a through the injection hole. The injection check valve lift amount control plate 75 is provided on the opposite side of the injection check valve 74 from the injection vertical hole 72 and is for limiting the lift amount of the injection check valve 74.

[0026] The injection check valve 74 and the injection check valve lift control plate 75 are fixed to one end face in the height direction of the cylinder 23 by a fixing member 76. The fixing member 76 is, for example, a bolt, and as shown in Figure 4, its head 76a protrudes outward from the end face in the height direction of the cylinder 23. In the case of a single rotary compressor, a housing hole 76b for housing the protruding head 76a is provided in the lower bearing 25, and in the case of a twin rotary compressor, a housing hole 76b for housing the protruding head 76a is provided in the intermediate plate 28. This suppresses the depth, i.e., the axial length, of the injection check valve operating groove 77, and allows for the effective discharge of compressed refrigerant. Note that the fixing member 76 may be something other than a bolt, for example, a rivet.

[0027] The injection vertical hole 72 is opened and closed by an injection check valve 74, which is a leaf spring. The injection check valve 74 is prevented from lifting excessively by an injection check valve lift amount control plate 75. Furthermore, an arc-shaped communication portion 73 is formed radially inside the injection check valve operating groove 77, connecting the injection vertical hole 72 and the compression chamber 23a. Therefore, the injection check valve operating groove 77 is in communication with the compression chamber 23a via the communication portion 73.

[0028] When the pressure in the compression chamber 23a is lower than the injection pressure, the injected refrigerant pushes up the injection check valve 74 and flows into the compression chamber 23a. This increases the flow rate of refrigerant compressed and discharged in the cylinder 23 by the amount of the injected refrigerant. Furthermore, when compression in the compression chamber 23a progresses and a high pressure is reached, the injection check valve 74 seats on the end face of the cylinder 23 in the height direction, closing the injection vertical hole 72 and preventing backflow of high-pressure refrigerant from the compression chamber 23a to the injection vertical hole 72.

[0029] Even if there are multiple cylinders 23 instead of just one, each cylinder 23 is provided with one injection mechanism. Specifically, the same number of compression chambers 23a as cylinders 23 are provided, and each compression chamber 23a is provided with an injection mechanism for injecting refrigerant at an intermediate pressure. The components of the injection mechanism according to this embodiment are an intake port 23e, a discharge valve 24a, a discharge port 24b, an injection lateral hole 70, a tip hole 70a, an injection piping connection part 71, an injection vertical hole 72, a communication part 73, an injection check valve 74, an injection check valve lift amount control plate 75, a fixing member 76, and an injection check valve operating groove 77.

[0030] In the compression chamber 23a, the suction, compression, and discharge operations are repeated, so the refrigerant gas discharged from the discharge port 24b is discharged intermittently, resulting in noise such as pulsating sounds. To reduce this, as shown in Figure 1, a discharge muffler 27 is attached to the outside of the upper bearing 24, i.e., on the side of the electric motor 30, so as to cover the upper bearing 24. The discharge muffler 27 has a discharge hole (not shown) that connects the space formed by the discharge muffler 27 and the upper bearing 24 to the inside of the sealed container 10. The refrigerant gas discharged from the cylinder 23 through the discharge port 24b is first discharged into the space formed by the discharge muffler 27 and the upper bearing 24, and then discharged into the sealed container 10 through the discharge hole.

[0031] As shown in Figure 1, an intake muffler 101 is provided next to the sealed container 10 to prevent liquid refrigerant from being directly drawn into the compression chamber 23a of the cylinder 23. Generally, a sealed compressor 100 receives a mixture of low-pressure refrigerant gas and liquid refrigerant from an external circuit to which it is connected. If liquid refrigerant flows into the cylinder 23 and is compressed in the compression mechanism 20, it can cause a malfunction of the compression mechanism 20. Therefore, the intake muffler 101 separates the liquid refrigerant from the refrigerant gas and sends only the refrigerant gas to the compression chamber 23a. The intake muffler 101 is connected to the intake port 23e of the cylinder 23 by an intake connecting pipe 110, and the low-pressure refrigerant gas sent from the intake muffler 101 is drawn into the compression chamber 23a via the intake connecting pipe 110.

[0032] As described above, the compression mechanism 20 is configured such that the eccentric shaft portion 21b of the rotating shaft 21 rotates within the compression chamber 23a of the cylinder 23 due to the rotational motion of the rotating shaft 21. The working chamber, which is partitioned by the inner circumference of the compression chamber 23a, the outer circumference of the rolling piston 22 fitted to the eccentric shaft portion 21b, and the vane 26, increases or decreases in volume as the rotating shaft 21 rotates. First, this working chamber and the intake port 23e come into contact, and low-pressure refrigerant gas is drawn into the working chamber. Next, the connection between the working chamber and the intake port 23e is closed, and the refrigerant gas inside the working chamber is compressed as the volume of the working chamber decreases. Finally, the working chamber and the discharge port 24b come into contact, and after the refrigerant gas inside the working chamber reaches a predetermined pressure, the discharge valve 24a provided at the discharge port 24b opens, and the refrigerant gas, which has become high temperature and high pressure, is released outside the working chamber, i.e., outside the compression chamber 23a. The high-temperature, high-pressure refrigerant gas discharged from the compression chamber 23a through the discharge muffler 27 into the sealed container 10 passes through the electric motor 30, rises within the sealed container 10, and is discharged to the outside of the sealed container 10 through the discharge pipe 102 located at the top of the sealed container 10. Outside the sealed container 10, a refrigerant circuit is configured through which the refrigerant flows, and the discharged refrigerant circulates through the refrigerant circuit and returns to the intake muffler 101.

[0033] Figure 7 is a schematic plan view showing an enlarged view of the area around the injection vertical hole 72 and the communication portion 73 of the sealed compressor 100 according to the embodiment. Figure 8 is a schematic plan view showing the first region R1 of the sealed compressor 100 according to the embodiment, projected in the height direction of the cylinder 23 from the discharge port 24b. Figure 9 is a schematic plan view showing the second region R2 of the sealed compressor 100 according to the embodiment, formed by the inner circumference of the cylinder 23, the outer circumference of the rolling piston 22, and the vane 26. Figure 10 is a schematic plan view showing the third region R3 of the sealed compressor 100 according to the embodiment, projected in the height direction of the cylinder 23 from the discharge notch 23d.

[0034] As described above, each cylinder 23 is provided with one intake port 23e and one discharge port 24b, and the intake port 23e and the discharge port 24b communicate with each other at any of the orbital phases of the rolling piston 22. Here, as shown in Figures 3 and 7, the injection vertical bore 72 is located outside the inner circumference of the cylinder 23. The communication portion 73 has an arc-shaped communication portion wall surface 73a that extends radially from the injection vertical bore 72 side toward the inner circumference of the cylinder 23. This communication portion wall surface 73a has a shape that is easy to machine with an end mill, and can therefore be easily provided using an end mill.

[0035] As shown in Figures 7 and 8, in a plan view, the straight line X1 connecting the center C1 of the injection vertical hole 72 and the center C2 of the boundary 73b between the communication portion 73 and the inner circumference of the cylinder 23 passes through a first region R1, which is the projection of the discharge port 24b in the height direction of the cylinder 23. Here, the compressed high-temperature, high-pressure refrigerant passes through this first region R1 when it is discharged from the discharge port 24b. With the injection vertical hole 72 and the communication portion 73 arranged in this way, the relatively low-temperature injection refrigerant passes through the high-temperature portion of the first region R1, which becomes hot when the compressed high-temperature, high-pressure refrigerant is discharged from the discharge port 24b and is heated, thereby cooling the high-temperature portion of the first region R1. As a result, overheating of the high-temperature portion of the first region R1 is suppressed, and thus deterioration of reliability can be suppressed. Here, the high-temperature portion refers to the parts of the components constituting the compression mechanism 20, namely the cylinder 23, rolling piston 22, vane 26, upper bearing 24, lower bearing 25, and intermediate plate 28, that become hot.

[0036] Alternatively, as shown in Figures 7 and 9, in a plan view, the straight line X1 connecting the center C1 of the injection vertical hole 72 and the center C2 of the boundary 73b between the communication portion 73 and the inner circumference of the cylinder 23 passes through the following second region R2. Here, the second region R2 is the region formed by the inner circumference of the cylinder 23, the outer circumference of the rolling piston 22, and the vane 26 at the phase of the rolling piston 22 where the internal pressure Pc, which is the pressure of the refrigerant in the compression chamber 23a of the cylinder 23, and the discharge pressure Pd, which is the pressure of the refrigerant discharged from the discharge port 24b, coincide. At the phase of the rolling piston 22 where the internal pressure Pc, which is the pressure of the refrigerant in the compression chamber 23a of the cylinder 23, and the discharge pressure Pd, which is the pressure of the refrigerant discharged from the discharge port 24b, coincide, compressed high-temperature, high-pressure refrigerant exists in the second region R2. In this way, the injection vertical holes 72 and the communication section 73 are arranged so that the relatively low-temperature injection refrigerant passes through the high-temperature area in the second region R2, which is heated by the compressed high-temperature, high-pressure refrigerant, thereby cooling the high-temperature area in the second region R2. As a result, overheating of the high-temperature area in the second region R2 is suppressed, and thus deterioration of reliability can be suppressed.

[0037] Alternatively, as shown in Figures 7 and 10, when the communication portion 73 and the discharge notch 23d are projected onto the same end face in the height direction of the cylinder 23, they are positioned to interfere with each other. In other words, when the communication portion 73 and the discharge notch 23d are projected onto the same plane in the height direction, they are positioned to overlap in at least part. In this case, when viewed from above, the straight line X1 connecting the center C1 of the injection vertical hole 72 and the center C2 of the boundary portion 73b of the communication portion 73 with the inner circumference of the cylinder 23 passes through a third region R3 formed by projecting the discharge notch 23d onto the cylinder 23 in the height direction. Here, when the communication portion 73 and the discharge notch 23d are projected onto the same plane in the height direction, they are positioned to overlap in at least part, so the compressed high-temperature, high-pressure refrigerant will pass through the third region R3 when discharged from the discharge port 24b. In this way, the injection vertical hole 72 and the communication section 73 are arranged so that the relatively low-temperature injection refrigerant passes through the high-temperature portion of the third region R3, which is heated and becomes hot when the compressed high-temperature, high-pressure refrigerant is discharged from the discharge port 24b, thereby cooling the high-temperature portion of the third region R3. As a result, overheating of the high-temperature portion of the third region R3 is suppressed, and thus deterioration of reliability can be suppressed.

[0038] Furthermore, as shown in Figure 7, the communication portion 73 is formed such that the width L1 (for example, 5 mm) of the boundary portion 73b between the communication portion 73 and the inner circumference of the cylinder 23 is larger than the width L2 (for example, 4 mm) of the boundary portion 73c between the communication portion 73 and the injection check valve operating groove 77. In this way, by forming the communication portion 73 such that the width L1 of the boundary portion 73b is larger than the width L2 of the boundary portion 73c, the injection direction of the injected refrigerant is broadened, allowing the injected refrigerant to be sprayed in a wider area, thereby effectively cooling the high-temperature portion.

[0039] Figure 11 is a schematic diagram of a refrigeration cycle device 200 equipped with a sealed compressor 100 according to an embodiment. Next, the refrigeration cycle device 200 equipped with a sealed compressor 100 will be described using Figure 11. The refrigeration cycle device 200 is, for example, an air conditioning system. The refrigeration cycle device 200 includes a sealed compressor 100 equipped with an intake muffler 101 connected to the intake side of the sealed compressor 100, a flow path switching valve 103 connected to the discharge side of the sealed compressor 100, an outdoor heat exchanger 104, a pressure reducer 105, and an indoor heat exchanger 106, which are sequentially connected via piping to form the main circuit of a refrigerant circuit through which the refrigerant circulates. In addition, the refrigerant circuit is provided with an injection pipe 107 that branches off from a branching point 107c between the pressure reducer 105 and the indoor heat exchanger 106 in the main circuit and is connected to the compression mechanism 20 of the sealed compressor 100. Furthermore, an injection pressure reducer 107a for adjusting the injection pressure and flow rate, and an injection muffler 107b for rectifying the refrigerant flow are provided in the middle of the injection piping 107. Note that the injection pressure reducer 107a may also serve as a device for switching the injection ON / OFF, or a solenoid valve may be separately provided in the injection piping 107, and the injection ON / OFF may be switched using that solenoid valve.

[0040] The flow path switching valve 103 is, for example, a four-way valve, and switches between cooling and heating operation by switching the direction of refrigerant flow. Alternatively, a combination of two-way and three-way valves may be used instead of a four-way valve for the flow path switching valve 103. The pressure reducer 105 reduces the pressure of the refrigerant to cause expansion. The pressure reducer 105 is, for example, an electronic expansion valve whose throttle opening can be adjusted. By adjusting the opening, it controls the refrigerant pressure flowing into the indoor heat exchanger 106 during cooling operation and the refrigerant pressure flowing into the outdoor heat exchanger 104 during heating operation. The outdoor heat exchanger 104 functions as an evaporator or condenser, exchanging heat between air and refrigerant to vaporize or condense the refrigerant. The outdoor heat exchanger 104 functions as an evaporator during heating operation and as a condenser during cooling operation. The indoor heat exchanger 106 functions as either an evaporator or a condenser, exchanging heat between air and refrigerant to vaporize or condense the refrigerant. The indoor heat exchanger 106 functions as a condenser during heating operation and as an evaporator during cooling operation.

[0041] In heating operation, the flow path switching valve 103 is connected to the solid line side in Figure 11. The high-temperature, high-pressure refrigerant compressed in the sealed compressor 100 flows to the indoor heat exchanger 106, where it condenses and liquefies. After being throttled by the pressure reducer 105, it becomes a low-temperature, low-pressure two-phase state and flows to the outdoor heat exchanger 104, where it evaporates, gasifies, and returns to the sealed compressor 100 through the flow path switching valve 103. In other words, the refrigerant circulates as shown by the solid arrow in Figure 11. Through this circulation, the outdoor heat exchanger 104, which acts as an evaporator, exchanges heat with the outside air, and the refrigerant sent to the outdoor heat exchanger 104 absorbs heat. The refrigerant that has absorbed heat is then sent to the indoor heat exchanger 106, which acts as a condenser, where it exchanges heat with the indoor air and warms the indoor air.

[0042] Furthermore, when increasing heating capacity during heating operation, or when there is a large difference between the suction pressure and discharge pressure, and high-temperature areas are unevenly distributed in the compression mechanism 20, the valve of the injection pressure reducer 107a is opened to allow the relatively low-temperature refrigerant, which has exchanged heat with the indoor air in the indoor heat exchanger 106, to flow into the injection piping 107 (see the thick solid arrow in Figure 11). Since the outlet of the injection piping 107 is connected to the compression mechanism 20 of the sealed compressor 100, the relatively low-temperature refrigerant that flows into the injection piping 107 flows into the compression mechanism 20 of the sealed compressor 100 as the injected refrigerant. The injected refrigerant that flows into the compression mechanism 20 is then compressed together with the low-pressure refrigerant that has flowed from the main circuit into the suction muffler 101, and discharged from the sealed compressor 100 as a high-temperature, high-pressure refrigerant gas.

[0043] In cooling operation, the flow path switching valve 103 is connected to the dashed line side in Figure 11. The high-temperature, high-pressure refrigerant compressed by the sealed compressor 100 flows to the outdoor heat exchanger 104, where it condenses and liquefies. After being throttled by the pressure reducer 105, it becomes a low-temperature, low-pressure two-phase state and flows to the indoor heat exchanger 106, where it evaporates and gasifies before returning to the sealed compressor 100 via the flow path switching valve 103. In other words, when switching from heating to cooling operation, the indoor heat exchanger 106 changes from a condenser to an evaporator, and the outdoor heat exchanger 104 changes from an evaporator to a condenser. Therefore, the refrigerant circulates as shown by the dashed arrow in Figure 11. Through this circulation, the indoor heat exchanger 106, which is the evaporator, exchanges heat with the indoor air, absorbing heat from the indoor air, i.e., cooling the indoor air. The refrigerant that has absorbed heat is sent to the outdoor heat exchanger 104, which is the condenser, where it exchanges heat with the outside air and releases heat to the outside air.

[0044] As described above, the sealed compressor 100 according to the embodiment comprises a compression chamber 23a for compressing a refrigerant, an injection vertical hole 72 extending in the height direction which constitutes part of the injection flow path for supplying refrigerant into the compression chamber 23a, and a cylinder 23 having a communication portion 73 that connects the injection vertical hole 72 and the compression chamber 23a, and a closing member fixed to both ends of the cylinder 23 in the height direction and closing the compression chamber 23a. The closing member fixed to one end face of the cylinder 23 has a discharge port 24b for discharging the compressed refrigerant outside the compression chamber 23a. In a plan view, the straight line X1 connecting the center C1 of the injection vertical hole 72 and the center C2 of the boundary portion 73b between the communication portion 73 and the inner circumference of the cylinder 23 passes through the region obtained by projecting the discharge port 24b in the height direction of the cylinder 23.

[0045] Furthermore, the sealed compressor 100 according to the embodiment includes an electric motor 30 having a stator 31 and a rotor 32, a cylinder 23 having a compression chamber 23a for compressing refrigerant, an injection vertical hole 72 extending in the height direction which constitutes part of the injection flow path for supplying refrigerant into the compression chamber 23a, and a communication portion 73 that connects the injection vertical hole 72 and the compression chamber 23a, a rotating shaft 21 provided in the compression chamber 23a and having an eccentric shaft portion 21b that performs eccentric motion within the compression chamber 23a and is rotated by the electric motor 30, a rolling piston 22 provided on the eccentric shaft portion 21b, and a space formed by the inner circumference of the cylinder 23 and the outer circumference of the rolling piston 22 on the intake side The device comprises a vane 26 that separates the compression side and the compression side, and closure members fixed to both ends of the cylinder 23 in the height direction, respectively, which close the compression chamber 23a. The closure member fixed to one end of the cylinder 23 has a discharge port 24b for discharging the compressed refrigerant outside the compression chamber 23a. In a plan view, the straight line X1 connecting the center C1 of the injection vertical hole 72 and the center C2 of the boundary portion 73b between the communication portion 73 and the inner circumference of the cylinder 23 passes through the region formed by the inner circumference of the cylinder 23, the outer circumference of the rolling piston 22, and the vane 26 at the phase of the rolling piston 22 where the pressure of the refrigerant in the compression chamber 23a and the pressure of the refrigerant discharged from the discharge port 24b are equal.

[0046] Alternatively, the sealed compressor 100 according to the embodiment includes a compression chamber 23a for compressing refrigerant, a cylinder 23 having a vertical injection hole 72 extending in the height direction which constitutes part of the injection flow path for supplying refrigerant into the compression chamber 23a, and a communication portion 73 that connects the vertical injection hole 72 and the compression chamber 23a, and a closing member fixed to both ends of the cylinder 23 in the height direction which closes the compression chamber 23a, wherein the closing member fixed to one end of the cylinder 23 has a discharge port 24b for discharging the compressed refrigerant outside the compression chamber 23a. On the inner circumference of the cylinder 23, a discharge notch 23d is formed by cutting out a part of one end face of the cylinder 23. In a plan view, the straight line X1 connecting the center C1 of the injection vertical hole 72 and the center C2 of the boundary portion 73b of the communication portion 73 with the inner circumference of the cylinder 23 passes through the region where the discharge notch 23d is projected in the height direction of the cylinder 23, when the communication portion 73 and the discharge notch 23d are positioned so that at least a part of them overlap.

[0047] In the sealed compressor 100 according to the embodiment, the cylinder 23 has an injection vertical hole 72 and a communication portion 73 which constitute part of the injection flow path. In a plan view, the straight line X1 connecting the center C1 of the injection vertical hole 72 and the center C2 of the boundary portion 73b of the communication portion 73 between the cylinder 23 and the inner circumference of the cylinder 23 passes through the region obtained by projecting the discharge port 24b in the height direction of the cylinder 23, or passes through the region formed by the inner circumference of the cylinder 23, the outer circumference of the rolling piston 22 and the vane 26 at the phase of the rolling piston 22 where the pressure of the refrigerant in the compression chamber 23a and the pressure of the refrigerant discharged from the discharge port 24b are the same, or, when the communication portion 73 and the discharge notch 23d are projected onto the same plane in the height direction, the straight line X1 passes through the region obtained by projecting the discharge notch 23d in the height direction of the cylinder 23 if the communication portion 73 and the discharge notch 23d are positioned so that at least a part of them overlap. With the injection vertical holes 72 and communication section 73 arranged in this manner, a relatively low-temperature injection refrigerant passes through the high-temperature area in the region that becomes hot when heated by the compressed high-temperature, high-pressure refrigerant, thereby cooling the high-temperature area. As a result, overheating of the high-temperature area is suppressed, and thus deterioration of reliability can be suppressed.

[0048] Furthermore, the sealed compressor 100 according to this embodiment is equipped with an injection check valve 74 that opens and closes the injection vertical hole 72, and an injection check valve operating groove 77 on which the injection check valve 74 is located is formed on the other end face in the height direction of the cylinder 23, and in plan view, the width L1 of the boundary portion 73b of the communication portion 73 with the inner circumference of the cylinder 23 is greater than the width L2 of the boundary portion 73c of the communication portion 73 with the injection check valve operating groove 77.

[0049] In the sealed compressor 100 according to this embodiment, the width L1 of the boundary portion 73b is larger than the width L2 of the boundary portion 73c, and the communication portion 73 is formed so that the injection direction of the injected refrigerant is widened. As a result, the injected refrigerant can be sprayed in a wide area, and the high-temperature portion can be effectively cooled.

[0050] Furthermore, in the sealed compressor 100 according to the embodiment, when viewed from above, the communication portion 73 has a communication portion wall surface 73a that is arc-shaped along the radial direction.

[0051] According to the sealed compressor 100 of the embodiment, the wall surface 73a of the communication section 73 has a shape that is easy to process with an end mill or the like, so it can be easily installed using an end mill or the like.

[0052] This application is not limited to the embodiments described above, and the components can be modified and implemented in practice without departing from the gist of the invention. Furthermore, the multiple components disclosed in the embodiments described above can be combined as appropriate. [Explanation of Symbols]

[0053] 10 Sealed container, 10a Bottom, 11 Upper container, 12 Lower container, 20 Compression mechanism, 21 Rotating shaft, 21a Main shaft, 21b Eccentric shaft, 21c Sub-shaft, 22 Rolling piston, 23 Cylinder, 23a Compression chamber, 23b Back pressure chamber, 23c Vane groove, 23d Discharge notch, 23e Intake port, 24 Upper bearing, 24a Discharge valve, 24b Discharge port, 25 Lower bearing, 26 Vane, 27 Discharge muffler, 28 Intermediate plate, 30 Electric motor, 31 Stator, 32 Rotor, 70 Injection side hole, 70a Tip hole, 71 Injection piping connection, 72 Injection vertical hole, 73 Communication section, 73a Communication section wall, 73b Boundary section, 73c Boundary section, 74 75 Injection check valve, 76 Injection check valve lift amount control plate, 76 Fixing member, 76a Head, 76b Storage hole, 77 Injection check valve operating groove, 100 Sealed compressor, 101 Intake muffler, 102 Discharge pipe, 103 Flow path switching valve, 104 Outdoor heat exchanger, 105 Pressure reducer, 106 Indoor heat exchanger, 107 Injection piping, 107a Injection pressure reducer, 107b Injection muffler, 107c Branch point, 110 Intake connecting pipe, 200 Refrigeration cycle device.

Claims

1. A cylinder having a compression chamber for compressing a refrigerant, a vertical injection hole extending in the height direction that constitutes part of an injection flow path for supplying refrigerant into the compression chamber, and a communication portion that connects the vertical injection hole and the compression chamber, The cylinder comprises a closing member fixed to both ends in the height direction and closing the compression chamber, The blocking member, fixed to one end face of the cylinder, has a discharge port for discharging compressed refrigerant outside the compression chamber. Viewed from a plane, The straight line connecting the center of the injection vertical hole and the center of the boundary between the communication portion and the inner circumference of the cylinder is, The discharge port passes through the region projected in the height direction of the cylinder, The system includes an injection check valve that opens and closes the injection vertical hole, An injection check valve operating groove is formed on the other end face in the height direction of the cylinder, where the injection check valve is located. Viewed from a plane, The width of the boundary portion between the communication portion and the inner circumference of the cylinder is greater than the width of the boundary portion between the communication portion and the injection check valve operating groove. The aforementioned communication section has a pair of communication section wall surfaces, The distance between each of the pair of communication section wall surfaces and the center of the flow path in the communication section is longer in both cases as it approaches the inner circumference of the cylinder. A sealed compressor.

2. An electric motor having a stator and a rotor, A cylinder having a compression chamber for compressing a refrigerant, a vertical injection hole extending in the height direction that constitutes part of an injection flow path for supplying refrigerant into the compression chamber, and a communication portion that connects the vertical injection hole and the compression chamber, A rotating shaft provided in the compression chamber, having an eccentric shaft portion that performs eccentric motion within the compression chamber, and rotated by the electric motor, A rolling piston provided on the eccentric shaft portion, A vane divides the space formed by the inner circumference of the cylinder and the outer circumference of the rolling piston into an intake side and a compression side, The cylinder comprises a closing member fixed to both ends in the height direction and closing the compression chamber, The blocking member, fixed to one end face of the cylinder, has a discharge port for discharging compressed refrigerant outside the compression chamber. Viewed from a plane, The straight line connecting the center of the injection vertical hole and the center of the boundary between the communication portion and the inner circumference of the cylinder is, In the phase of the rolling piston where the pressure of the refrigerant in the compression chamber and the pressure of the refrigerant discharged from the discharge port coincide, The region formed by the inner circumference of the cylinder, the outer circumference of the rolling piston, and the vane passes through, The system includes an injection check valve that opens and closes the injection vertical hole, An injection check valve operating groove is formed on the other end face in the height direction of the cylinder, where the injection check valve is located. Viewed from a plane, The width of the boundary portion between the communication portion and the inner circumference of the cylinder is greater than the width of the boundary portion between the communication portion and the injection check valve operating groove. The aforementioned communication section has a pair of communication section wall surfaces, The distance between each of the pair of communication section wall surfaces and the center of the flow path in the communication section is longer in both cases as it approaches the inner circumference of the cylinder. A sealed compressor.

3. A cylinder having a compression chamber for compressing a refrigerant, a vertical injection hole extending in the height direction that constitutes part of an injection flow path for supplying refrigerant into the compression chamber, and a communication portion that connects the vertical injection hole and the compression chamber, The cylinder comprises a closing member fixed to both ends in the height direction and closing the compression chamber, The blocking member, fixed to one end face of the cylinder, has a discharge port for discharging compressed refrigerant outside the compression chamber. A discharge notch is formed on the inner circumference of the cylinder by cutting out a portion of one end face of the cylinder. Viewed from a plane, The straight line connecting the center of the injection vertical hole and the center of the boundary between the communication portion and the inner circumference of the cylinder is, When the communication portion and the discharge notch are projected onto the same plane in the height direction, if the communication portion and the discharge notch are positioned so that at least a portion of them overlap, The discharge notch passes through the region projected in the height direction of the cylinder, The system includes an injection check valve that opens and closes the injection vertical hole, An injection check valve operating groove is formed on the other end face in the height direction of the cylinder, where the injection check valve is located. Viewed from a plane, The width of the boundary portion between the communication portion and the inner circumference of the cylinder is greater than the width of the boundary portion between the communication portion and the injection check valve operating groove. The aforementioned communication section has a pair of communication section wall surfaces, The distance between each of the pair of communication section wall surfaces and the center of the flow path in the communication section is longer in both cases as it approaches the inner circumference of the cylinder. A sealed compressor.

4. Viewed from a plane, The pair of connecting wall surfaces have an arc shape along the radial direction. A sealed compressor according to any one of claims 1 to 3.

5. A sealed compressor according to any one of claims 1 to 3 Refrigeration cycle device.

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