Closed-type compressors and refrigeration cycle systems

Abstract

A hermetic compressor equipped with a cylinder in which are formed a compression chamber for compressing a coolant, and a vertical injection hole which extends in the height direction and constitutes part of an injection channel for supplying the coolant into the compression chamber, an obstruction member which obstructs the compression chamber and is secured to both end surfaces of the cylinder in the height direction, and an injection check valve for opening and closing the vertical injection hole, wherein: one end of the vertical injection hole is formed in one end surface of the cylinder; the one end surface of the cylinder has a plurality of first securing holes formed therein into which a plurality of first securing members for securing the obstruction member to the end surface are inserted; the plurality of first securing holes are positioned in a manner such that the distance from the center thereof to the center of the cylinder is identical; and at least part of the vertical injection hole is positioned in a region inside a virtual circle, the center of which is the center of the cylinder and the radius of which extends from the center of the cylinder to the centers of the plurality of first securing holes.

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 is mainly composed of a cylinder, a main bearing, a sub-bearing, an intermediate plate, and a piston. By rotating an eccentric-shaped crankshaft, the piston is eccentrically rotated to reduce the volume of the compression chamber, thereby compressing 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 a medium-pressure liquid or gas refrigerant is injected into the compression chamber from an injection pipe 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 backflow of the compressed refrigerant into this 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 sealed compressor having an injection mechanism like the one described in Patent Document 1, a refrigerant at a higher pressure than the intake refrigerant (the intermediate-pressure refrigerant mentioned above) is injected into the compression chamber at high speed as an injection refrigerant. However, due to the fluid force of this injection, the seals between the cylinder and the main bearing, sub-bearing, or intermediate plate can locally separate, making it easy for refrigerant to leak outside the compression mechanism, which leads to a deterioration in compression efficiency.

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

[0007] The sealed compressor according to this disclosure comprises a cylinder having a compression chamber for compressing a refrigerant and an injection vertical bore extending in the height direction that constitutes part of an injection flow path for supplying refrigerant into the compression chamber; closing members fixed to both ends of the cylinder in the height direction and closing the compression chamber; and an injection check valve for opening and closing the injection vertical bore, wherein one end of the injection vertical bore is formed on one end face of the cylinder, and a plurality of first fixing holes are formed on the one end face of the cylinder into which a plurality of first fixing members for fixing the closing member are inserted, the plurality of first fixing holes are arranged such that the distance from their centers to the center of the cylinder is the same, and at least a portion of the injection vertical bore is located in a region inside a virtual circle with the center of the cylinder as its center and the radius from the center of the cylinder to the centers of the plurality of first fixing holes. Furthermore, the cylinder is provided with a second fixing member that secures the injection check valve to one end face, and the second fixing member is positioned in a region outside the virtual circle. It is.

[0008] Alternatively, the sealed compressor according to the present disclosure comprises a cylinder having a compression chamber for compressing a refrigerant and an injection vertical hole extending in the height direction that constitutes part of an injection flow path for supplying refrigerant into the compression chamber; closure members fixed to both ends of the cylinder in the height direction and closing the compression chamber; and an injection check valve for opening and closing the injection vertical hole, wherein one end of the injection vertical hole is formed on one end face of the cylinder, and a plurality of first fixing holes are formed on the one end face of the cylinder into which a plurality of first fixing members for fixing the closure member are inserted, and when the shortest first fixing hole is defined as the one with the shortest distance from the center of the cylinder to the center of the plurality of first fixing holes, at least a portion of the injection vertical hole is located in a region inside a virtual circle with the center of the cylinder as its center and the radius from the center of the cylinder to the center of the shortest first fixing hole. Furthermore, the cylinder is provided with a second fixing member that secures the injection check valve to one end face, and the second fixing member is positioned in a region outside the virtual circle. It is.

[0009] Furthermore, the refrigeration cycle system relating to this disclosure is equipped with the above-mentioned sealed compressor. [Effects of the Invention]

[0010] According to the sealed compressor and refrigeration cycle device of this disclosure, the cylinder has injection vertical holes that constitute part of the injection flow path, and at least a portion of the injection vertical holes are located in a region inside a virtual circle with the center of the cylinder as the center and the radius being from the center of the cylinder to the centers of the multiple first fixed holes, or in a region inside a virtual circle with the center of the cylinder as the center and the radius being from the center of the cylinder to the center of the shortest first fixed hole. By arranging the injection vertical holes in this way, leakage of the injected refrigerant can be suppressed and deterioration of compression efficiency can be suppressed. [Brief explanation of the drawing]

[0011] [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 a region formed by connecting the centers of multiple bolt holes provided in the cylinder of a sealed compressor according to an embodiment. [Figure 8] Figure 7 is a schematic diagram showing an enlarged view of the compression mechanism as seen through the arrow E. [Figure 9] This is a schematic diagram of a refrigeration cycle system equipped with a sealed compressor according to an embodiment. [Modes for carrying out the invention]

[0012] Embodiments of this disclosure will be described below with reference to the drawings. However, this disclosure is not limited to the embodiments described below. Also, the size relationships of the components in the following drawings may differ from those of the actual components.

[0013] Embodiment. Figure 1 is a schematic diagram showing a longitudinal cross-section of a sealed compressor 100 according to an embodiment. Figure 2 is a schematic plan view of the compression mechanism 20 as seen in the direction of the arrow when the sealed compressor 100 of Figure 1 is cut at AA. Figure 3 is a schematic plan view of the compression mechanism 20 as seen in the direction of the arrow when the sealed compressor 100 of Figure 1 is cut at BB. Figure 4 is an enlarged schematic view of the section of the sealed compressor 100 of Figure 1 as seen by arrow C. Figure 5 is a schematic longitudinal cross-section of the cylinder 23 as seen in the direction of the arrow when the compression mechanism 20 of Figure 2 is cut at DD. Figure 6 is a schematic diagram showing a longitudinal cross-section of a modified example of the sealed compressor 100 according to an embodiment.

[0014] In the hermetic compressor 100 according to the embodiment, a single-cylinder rotary compressor having one cylinder 23 as shown in FIG. 1, that is, a single rotary compressor, is used. Hereinafter, the overall configuration of the hermetic compressor 100, which is a single rotary compressor, will be described.

[0015] As shown in FIG. 1, the hermetic compressor 100 includes a compression mechanism section 20 that compresses refrigerant gas and an electric motor 30 that drives the compression mechanism section 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 section 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 section 20 and the electric motor 30 are connected by a rotating shaft 21 extending in the vertical direction. The rotating shaft 21 transmits the rotational motion of the electric motor 30 to the compression mechanism section 20. In the compression mechanism section 20, the refrigerant gas is compressed by the transmitted rotational force and discharged into the hermetic container 10. The interior of the hermetic container 10 is filled with compressed high-temperature and high-pressure refrigerant gas, and refrigeration oil is stored at the bottom 10a of the hermetic container 10 for lubrication of the compression mechanism section 20. An oil pump (not shown) is provided at the lower part of the rotating shaft 21. The oil pump pumps up the refrigeration oil stored at the bottom 10a of the hermetic container 10 as the rotating shaft 21 rotates and supplies oil to each sliding part of the compression mechanism section 20. Thereby, the mechanical lubrication function of the compression mechanism section 20 is ensured.

[0016] 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.

[0017] As shown in FIGS. 1 to 3, the compression mechanism unit 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 axial ends open, is formed. Inside the compression chamber 23a, there are an eccentric shaft portion 21b of a 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 between 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 the refrigerant is compressed, and they are housed.

[0018] In the cylinder 23, a vane groove 23c extending in the radial direction is formed to penetrate in the axial direction. One side in the radial direction of the vane groove 23c opens into the compression chamber 23a, and a back pressure chamber 23b is formed on the other side in the radial direction. The vane 26 is housed in the vane groove 23c. The vane 26 reciprocates in the radial direction within the vane groove 23c. The shape of the vane 26 is a substantially rectangular parallelepiped shape in which the circumferential thickness of the compression chamber 23a is smaller than the radial length and the axial length of the compression chamber 23a when attached to the vane groove 23c. A vane spring (not shown) is provided in the back pressure chamber 23b of the vane groove 23c.

[0019] 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.

[0020] 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.

[0021] 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.

[0022] 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.

[0023] 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.

[0024] 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.

[0025] 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.

[0026] 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.

[0027] 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.

[0028] 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.

[0029] 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.

[0030] 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.

[0031] 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.

[0032] Figure 7 is a schematic plan view showing the region R formed by connecting the centers of a plurality of bolt holes 50 provided in the cylinder 23 of the sealed compressor 100 according to the embodiment. Figure 8 is an enlarged schematic view of the compression mechanism 20 in Figure 7 as seen by arrow E.

[0033] As shown in Figure 7, multiple bolt holes 50 (hereinafter also referred to as first fixing holes) are provided concentrically on the end face of the cylinder 23 in the height direction, and fastening bolts (hereinafter also referred to as first fixing members), which are not shown, are inserted into the bolt holes 50. Then, by fixing the upper bearing 24, the intermediate plate 28, and the lower bearing 25 to the end face of the cylinder 23 in the height direction with fastening bolts, a compression chamber 23a is formed inside the cylinder 23. In this embodiment, as shown in Figure 7, the cylinder 23 is provided with five bolt holes 50, but it is not limited to this, and there may be four or fewer, or six or more. In addition, multiple bolt holes 50 are provided on both end faces of the cylinder 23 in the height direction.

[0034] As shown in Figure 8, the injection check valve 74 is fixed to the end face in the height direction of the cylinder 23 by a fixing member 76. As shown in Figure 7, the injection vertical hole 72 is located at a distance of 70 mm from the center O of the cylinder 23. The inner circumference of the cylinder 23 is located at a distance of 60 mm from the center O of the cylinder 23. The center of the bolt hole 50 into which fastening bolts are inserted to fix each component that forms the compression chamber 23a of the cylinder 23, upper bearing 24, lower bearing 25, and intermediate plate 28 is located at a distance of 75 mm from the center O of the cylinder 23.

[0035] On the end face of the cylinder 23 where one end of the injection vertical hole 72 is formed, the injection vertical hole 72 is located in a region inside the virtual circle VC1 formed by connecting the centers of the bolt holes 50, that is, the region inside the virtual circle VC1 with the center O of the cylinder 23 as its center and the radius from the center O of the cylinder 23 to the center of the bolt hole 50 (the shaded region R in Figure 7).

[0036] In this embodiment, as shown in Figure 7, all five bolt holes 50 provided in the cylinder 23 are arranged to be at equal distances from the center O of the cylinder 23. That is, the distance from the center of each bolt hole 50 to the center O of the cylinder 23 is equal. However, there is also a possibility that not all of the bolt holes 50 are arranged to be at equal distances from the center O of the cylinder 23. In this case, on the end face of the cylinder 23 where one end of the injection vertical hole 72 is formed, the injection vertical hole 72 is located in a region inside a virtual circle VC2, where the center O of the cylinder 23 is the center of the circle, and the radius is the distance between the center of the bolt hole 50 closest to the center O of the cylinder 23 (hereinafter also referred to as the shortest first fixing hole) and the center O of the cylinder 23.

[0037] The injected refrigerant is at a higher pressure than the suction refrigerant and is injected into the compression chamber 23a at high speed. Due to the resulting fluid force, the seals between the cylinder 23 and the upper bearing 24, lower bearing 25, or intermediate plate 28 are locally separated, making it easy for refrigerant to leak outside the compression mechanism 20 through the resulting gap. Here, the form of these seals is such that the clearance between the metal surface of the well-polished cylinder 23 and the metal surface of the upper bearing 24, lower bearing 25, or intermediate plate 28, that is, the clearance between the metal surfaces, is filled with refrigerant oil.

[0038] As described above, the injection vertical hole 72 is positioned in a region inside the virtual circle VC1, which is formed by connecting the centers of the bolt holes 50 into which fastening bolts are inserted to bring metal surfaces into close contact in order to form a seal between the cylinder 23 and the upper bearing 24, lower bearing 25, or intermediate plate 28. Alternatively, it is positioned in a region inside the virtual circle VC2, whose radius is the distance between the center of the bolt hole 50 closest to the center O of the cylinder 23 and the center O of the cylinder 23. By doing so, the injection vertical hole 72 through which the injected refrigerant flows is located in a region inside the fixing portion between the cylinder 23 and the upper bearing 24, lower bearing 25, or intermediate plate 28, where the seal is less likely to separate. This suppresses leakage of the injected refrigerant outside the compression mechanism 20 and prevents deterioration of compression efficiency. In this embodiment, as shown in Figure 7, the entire injection vertical hole 72 is positioned inside the virtual circle VC1 or virtual circle VC2. However, the above effect can be obtained if at least a part of the injection vertical hole 72 is positioned inside the virtual circle VC1 or virtual circle VC2.

[0039] Furthermore, as shown in Figure 7, a fixing member 76 for fixing the injection check valve 74 is provided on the end face of the cylinder 23, where one end of the injection vertical hole 72 is formed. This fixing member 76 is positioned 85 mm from the center O of the cylinder 23 and is located in an area outside the virtual circle VC1 or virtual circle VC2. By positioning the fixing member 76 in this way, the layout of the components of the injection mechanism is broadened, reducing design constraints. This reduces wasted space inside the sealed container 10, allowing for miniaturization and thereby lowering manufacturing costs.

[0040] As shown in Figure 4, the space between the injection vertical hole 72 and the fixing member 76 is filled with the injection check valve lift control plate 75. Therefore, even if refrigerant leakage occurs near the fixing member 76, the impact on the compressor's performance is minimal.

[0041] As shown in Figure 8, the injection check valve 74 is provided with a protrusion 74c that extends from its side. The cylinder 23 is also provided with a recess 77a that engages with the protrusion 74c and restricts its rotational movement. When the protrusion 74c engages with the recess 77a, the protrusion 74c interferes with the recess 77a when the injection check valve 74 moves in the rotational direction. Therefore, the amount of rotation of the injection check valve 74 in the rotational direction when the bolt is fastened can be restricted by the recess 77a.

[0042] Although the protrusion 74c and recess 77a constitute the rotation-preventing structure for the injection check valve 74, the rotation-preventing structure is not limited to the above. Any rotation-preventing structure other than the above is acceptable, as long as the operating part, which is the lifting part of the injection check valve 74, interferes only with the injection check valve lift amount control plate 75 and does not interfere with the components constituting the compression mechanism 20, and the non-operating part, which is the non-lifting part of the injection check valve 74, restricts the amount of rotation of the injection check valve 74.

[0043] As shown in Figure 7, when the discharge valve 24a and the injection check valve 74 are projected onto the same end face in the height direction of the cylinder 23, the two valves are positioned to interfere with each other. In other words, when the discharge valve 24a and the injection check valve 74 are projected onto the same plane in the height direction of the cylinder 23, the two valves are positioned to overlap at least partially. By arranging the two valves in phase in this way, the layout options for the components of the injection mechanism are broadened, reducing design constraints. This reduces wasted space within the sealed container 10, allowing for miniaturization and thereby lowering manufacturing costs.

[0044] In this embodiment, one discharge valve 24a and one injection check valve 74 are provided for each cylinder 23. However, the embodiment is not limited to this, and multiple (two or more) discharge valves 24a and injection check valves 74 may be provided for each cylinder 23. In this case, when the multiple discharge valves 24a and the multiple injection check valves 74 are projected onto the same plane in the height direction of the cylinder 23, they should be positioned so that a portion of at least one of the multiple discharge valves 24a and at least one of the multiple injection check valves 74 overlap.

[0045] Figure 9 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 9. 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. The refrigerant circuit is also 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.

[0046] 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.

[0047] In heating operation, the flow path switching valve 103 is connected to the solid line side in Figure 9. The high-temperature, high-pressure refrigerant compressed by 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 9. 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.

[0048] Furthermore, when increasing heating capacity during heating operation, or when there is a large difference between the intake pressure and discharge pressure, resulting in high-temperature areas being 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 undergone heat exchange with the indoor air in the indoor heat exchanger 106, to flow into the injection piping 107 (see the thick solid arrow in Figure 9). 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 into the intake muffler 101 from the main circuit, and discharged from the sealed compressor 100 as a high-temperature, high-pressure refrigerant gas.

[0049] In cooling operation, the flow path switching valve 103 is connected to the dashed line side in Figure 9. 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 9. 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.

[0050] As described above, the sealed compressor 100 according to the embodiment comprises a cylinder 23 having a compression chamber 23a for compressing a refrigerant and an injection vertical hole 72 extending in the height direction that constitutes part of an injection flow path for supplying refrigerant into the compression chamber 23a; closing members fixed to both ends of the cylinder 23 in the height direction and closing the compression chamber 23a; and an injection check valve 74 for opening and closing the injection vertical hole 72. One end of the injection vertical hole 72 is formed on one end face of the cylinder 23, and a plurality of first fixing holes are formed on the one end face of the cylinder 23 into which a plurality of first fixing members for fixing the closing member to the end face are inserted. The plurality of first fixing holes are arranged such that the distance from their centers to the center O of the cylinder 23 is the same, and at least a portion of the injection vertical hole 72 is located in a region inside a virtual circle VC1 with the center O of the cylinder 23 as its center and the radius being the distance from the center O of the cylinder 23 to the centers of the plurality of first fixing holes.

[0051] Alternatively, the sealed compressor 100 according to the embodiment includes a cylinder 23 having a compression chamber 23a for compressing a refrigerant, and an injection vertical hole 72 extending in the height direction that constitutes part of an injection flow path for supplying refrigerant into the compression chamber 23a; closing members fixed to both ends of the cylinder 23 in the height direction and closing the compression chamber 23a; and an injection check valve 74 for opening and closing the injection vertical hole 72. One end of the injection vertical hole 72 is formed on one end face of the cylinder 23, and a plurality of first fixing holes are formed on the one end face of the cylinder 23 into which a plurality of first fixing members for fixing the closing member to the end face are inserted. If the shortest first fixing hole is defined as the one with the shortest distance from the center of the plurality of first fixing holes to the center O of the cylinder 23, then at least a portion of the injection vertical hole 72 is located in a region inside a virtual circle VC2 with the center O of the cylinder 23 as its center and the radius being the distance from the center O of the cylinder 23 to the center of the shortest first fixing hole.

[0052] In the sealed compressor 100 according to this embodiment, the cylinder 23 has injection vertical holes 72 that constitute part of the injection flow path, and at least a portion of the injection vertical holes 72 are located in a region inside a virtual circle VC1 with the center O of the cylinder 23 as its center and the radius being from the center O of the cylinder 23 to the centers of the plurality of first fixed holes, or in a region inside a virtual circle VC2 with the center O of the cylinder 23 as its center and the radius being from the center O of the cylinder 23 to the center of the shortest first fixed hole. By arranging the injection vertical holes 72 in this way, leakage of the injected refrigerant can be suppressed and deterioration of compression efficiency can be suppressed.

[0053] Furthermore, the sealed compressor 100 according to this embodiment includes a second fixing member that fixes an injection check valve 74 to one end face of the cylinder 23, and the second fixing member is located in a region outside of the virtual circle VC1 or virtual circle VC2.

[0054] According to the sealed compressor 100 of this embodiment, by arranging the second fixed member in an area outside the virtual circle VC1 or virtual circle VC2, the range of layout for components of the injection mechanism and other elements is broadened, reducing design constraints. As a result, wasted space inside the sealed container 10 can be reduced, allowing for miniaturization and thereby lowering manufacturing costs.

[0055] Furthermore, in the sealed compressor 100 according to the embodiment, the second fixing member is a bolt, and a portion of the bolt head 76a protrudes from one end face of the cylinder 23 toward the closing member, and the closing member has a storage hole 76b formed therein for housing a portion of the bolt head 76a.

[0056] According to the sealed compressor 100 of this embodiment, the depth of the injection check valve operating groove 77 can be suppressed, and the compressed refrigerant can be effectively discharged.

[0057] Furthermore, in the sealed compressor 100 according to the embodiment, a protrusion 74c is provided on the side surface of the injection check valve 74, and the cylinder 23 is provided with a recess 77a that fits with the protrusion 74c and restricts the rotational movement of the injection check valve 74.

[0058] In the sealed compressor 100 according to this embodiment, the protrusion 74c engages with the recess 77a, causing the protrusion 74c to interfere with the recess 77a when the injection check valve 74 moves in the rotational direction. Therefore, the amount of rotation of the injection check valve 74 in the rotational direction when bolted can be restricted by the recess 77a.

[0059] 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]

[0060] 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, 50 Bolt hole, 70 Injection side hole, 70a Tip hole, 71 Injection piping connection, 72 Injection vertical hole, 73 Communication part, 74 Injection check valve, 74c Protrusion, 75 Injection check valve lift amount control plate, 76 Fixing member, 76a Head, 76b Storage hole, 77 Injection check valve operating groove, 77a Recess, 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, and a vertical injection hole extending in the height direction that constitutes part of the injection flow path for supplying the refrigerant into the compression chamber, A closing member fixed to both ends of the cylinder in the height direction, which closes the compression chamber, The system includes an injection check valve that opens and closes the injection vertical hole, The injection vertical hole is formed at one end on one end face of the cylinder. One end face of the cylinder has a plurality of first fixing holes into which a plurality of first fixing members for fixing the closing member to the end face are inserted. The plurality of first fixing holes are arranged such that the distance from their centers to the center of the cylinder is the same. At least a portion of the aforementioned injection vertical hole, The cylinder is positioned in a region inside a virtual circle whose center is the center of the circle and whose radius is the distance from the center of the cylinder to the centers of the plurality of first fixing holes. The cylinder is provided with a second fixing member for fixing the injection check valve to one end face, The second fixing member is Located in the area outside the aforementioned virtual circle. A sealed compressor.

2. A cylinder having a compression chamber for compressing a refrigerant, and a vertical injection hole extending in the height direction that constitutes part of the injection flow path for supplying the refrigerant into the compression chamber, A closing member fixed to both ends of the cylinder in the height direction, which closes the compression chamber, The system includes an injection check valve that opens and closes the injection vertical hole, The injection vertical hole is formed at one end on one end face of the cylinder. One end face of the cylinder has a plurality of first fixing holes into which a plurality of first fixing members for fixing the closing member to the end face are inserted. If, among the plurality of first fixing holes, the one with the shortest distance from its center to the center of the cylinder is designated as the shortest first fixing hole, At least a portion of the aforementioned injection vertical hole, The cylinder is positioned in a region inside a virtual circle whose center is the center of the circle and whose radius is the distance from the center of the cylinder to the center of the shortest first fixing hole. The cylinder is provided with a second fixing member for fixing the injection check valve to one end face, The second fixing member is Located in the area outside the aforementioned virtual circle. A sealed compressor.

3. The second fixing member is a bolt, A portion of the head of the bolt protrudes toward the closing member side beyond one end face of the cylinder. The closing member has a storage hole formed therein for housing a portion of the bolt head. A sealed compressor according to claim 1 or 2.

4. A protrusion is provided on the side surface of the injection check valve. The cylinder is provided with a recess that engages with the protrusion and restricts the rotational movement of the injection check valve. A sealed compressor according to claim 1 or 2.

5. Equipped with a sealed compressor according to claim 1 or 2 Refrigeration cycle device.

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