Rotary compressor

Abstract

The compression mechanism portion of a rotary compressor includes: a rotary shaft having a main shaft portion and an eccentric shaft portion; a cylinder block having a cylinder chamber; a rotary piston that eccentrically rotates within the cylinder chamber of the cylinder block; and two end plates that are disposed on both end faces in the axial direction of the rotary shaft of the cylinder block. Further, the compression mechanism portion includes a sealing plate that is linked to the eccentric rotation of the rotary piston and blocks a portion of a jet port formed in one of the two end plates and located inside the inner peripheral surface of the rotary piston. The sealing plate is separately provided from the rotary piston and is rotatable relative to the rotary piston, and has a through-hole through which the main shaft portion of the rotary shaft passes, and the through-hole opens to the radially outer side.

Description

Technical Field

[0001] The present disclosure relates to a rotary compressor having an injection mechanism. Background Art

[0002] An existing rotary compressor has a structure in which a compression mechanism section and a motor section for driving the compression mechanism section via a rotating shaft are disposed in a sealed container. The compression mechanism section mainly includes: a cylindrical cylinder block, a rotating piston rotatably mounted on an eccentric shaft portion of the rotating shaft, and a vane slidably disposed in a vane groove provided in the cylinder block. A through hole is formed in the approximate center of the cylinder block in the axial direction, and the through hole is closed by end plates disposed on both end faces in the axial direction of the cylinder block, whereby a cylinder chamber is formed in the cylinder block. A compression chamber separated by the vane is formed in the cylinder chamber. The rotating shaft rotates so that the rotating piston eccentrically rotates in the cylinder chamber, and thus the volume of the compression chamber decreases, compressing the refrigerant.

[0003] In such a rotary compressor, a structure in which an injection port is provided in the end plate for injecting a refrigerant at an intermediate pressure into the compression chamber of the compression mechanism section is known (for example, refer to Patent Document 1). The position of the injection port is set such that in a state where the pressure in the compression chamber is low, the injection port faces the compression chamber, and on the other hand, in a state where the pressure in the compression chamber is high, the injection port is located inside the outer peripheral surface of the rotating piston that is rotating and does not face the compression chamber.

[0004] When the diameter of the injection port is increased in order to increase the injection amount, during the eccentric rotation of the rotating piston, the injection port sometimes is located inside the inner peripheral surface of the rotating piston. Since there is a space for storing refrigeration oil inside the inner peripheral surface of the rotating piston, if the injection port is located inside the inner peripheral surface of the rotating piston and faces this space, problems such as backflow of the injected refrigerant and discharge of the refrigeration oil occur.

[0005] Therefore, in Patent Document 1, on the contact surface side of the rotating piston with the end plate, an annular sealing portion protruding radially inward is integrally provided with the rotating piston. By this sealing portion, regardless of the position of the rotating piston in which rotational phase, the portion of the injection port located inside the inner peripheral surface of the rotating piston is blocked, and the injection port does not face the space inside the inner peripheral surface of the rotating piston.

[0006] Patent Document 1: Japanese Patent Laid-Open No. 11-013664

[0007] However, in a rotary compressor, a compression mechanism section that is small-sized and has a large displacement volume is required. In order to increase the displacement volume while maintaining the size of the rotary compressor, it is effective to increase the eccentricity of the eccentric shaft section of the rotary shaft while maintaining the inner diameter of the cylinder block of the compression mechanism section and the diameter of the main shaft section of the rotary shaft. The eccentricity of the eccentric shaft section of the rotary shaft can be maximized by making the radial end of the main shaft section and the radial end of the eccentric shaft section coplanar.

[0008] In Patent Document 1, it is possible to prevent the injection port from facing the above-mentioned void by providing an annular seal section on the rotary piston. On the other hand, there are the following problems. That is, due to the provision of the seal section, a gap of at least the amount of the radial thickness of the seal section is formed between the main shaft section of the rotary shaft passing through the inside of the seal section and the rotary piston, and the eccentricity cannot be enlarged to the maximum, and there is a problem that the eccentricity is restricted. SUMMARY OF THE INVENTION

[0009] The present disclosure has been made in view of such problems, and an object thereof is to provide a rotary compressor having a structure that prevents the injection port from facing the inside of the rotary piston and capable of maximizing the eccentricity of the eccentric shaft section of the rotary shaft.

[0010] The rotary compressor of the present disclosure includes a compression mechanism section that compresses a refrigerant through a compression chamber, and injects a refrigerant at an intermediate pressure from an injection port into the compression chamber of the compression mechanism section. The compression mechanism section includes: a rotary shaft having a main shaft section and an eccentric shaft section; a cylinder block having a cylinder chamber; a rotary piston mounted on the eccentric shaft section of the rotary shaft and eccentrically rotating in the cylinder chamber; two end plates disposed on both end faces in the axial direction of the rotary shaft of the cylinder block; a vane protruding into the cylinder chamber of the cylinder block and forming a compression chamber in the cylinder chamber by abutting against the rotary piston; and a seal plate linked to the eccentric rotation of the rotary piston and blocking a portion of the injection port formed in one of the two end plates and located inside the inner peripheral surface of the rotary piston. The seal plate is separately provided from the rotary piston and is relatively rotatable with respect to the rotary piston, and has a through-hole through which the main shaft section of the rotary shaft passes, and the through-hole opens to the outside in the radial direction.

[0011] The rotary compressor of the present disclosure has a sealing plate that blocks a portion of the injection port located inside the inner peripheral surface of the rotating piston, and has a structure that prevents the injection port from facing the inside of the rotating piston. Moreover, the sealing plate is provided separately from the rotating piston and can rotate relative to the rotating piston, and has a through hole through which the main shaft portion of the rotating shaft passes, and the through hole opens to the radially outer side. Thus, since the through hole opens to the radially outer side, the main shaft portion of the rotating shaft can be arranged close to the open side of the through hole, and the eccentricity of the eccentric shaft portion can be adjusted according to the position of the main shaft portion of the rotating shaft in the through hole. Therefore, when the main shaft portion approaches the open side of the through hole until it abuts against the inner peripheral surface of the rotating piston, the eccentricity of the eccentric shaft portion of the rotating shaft can be amplified to the maximum limit. BRIEF DESCRIPTION OF THE DRAWINGS

[0012] Figure 1 is a schematic cross-sectional view of the rotary compressor according to the embodiment.

[0013] Figure 2 is taken along Figure 1 line A-A of the compression mechanism portion.

[0014] Figure 3 is a view showing the sealing plate of the rotary compressor according to the embodiment.

[0015] Figure 4 is Figure 3 an explanatory view of the arrangement portion of the sealing plate.

[0016] Figure 5 is a view showing a state in which the Figure 4 sealing plate is arranged on the Figure 3 rotating piston.

[0017] Figure 6 is a view showing the compression operation of the rotary compressor according to the embodiment, and is a schematic cross-sectional view of the compression mechanism portion taken along Figure 1 line A-A.

[0018] Figure 7 is an explanatory view of the configurable area of the injection port of the rotary compressor according to the embodiment.

[0019] Figure 8 is an explanatory view of the eccentricity of the eccentric shaft portion of the conventional structure.

[0020] Figure 9 is Figure 8 a partial enlarged view.

[0021] Figure 10 is an explanatory view of the eccentricity of the eccentric shaft portion of the rotary compressor according to the present embodiment.

[0022] Figure 11 isFigure 10 Partial enlarged view.

[0023] Figure 12 It is an explanatory diagram of the assembly process of a double-rotary compressor with an existing structure.

[0024] Figure 13 It is an explanatory diagram of the assembly process of a double-rotary compressor with an existing structure.

[0025] Figure 14 It is an explanatory diagram of the assembly process of a rotary compressor according to an embodiment.

[0026] Figure 15 It is a diagram showing Modification 1 of the rotary compressor according to the embodiment.

[0027] Figure 16 It is a diagram showing Modification 2 of the rotary compressor according to the embodiment.

[0028] Figure 17 It is a diagram showing Modification 3 of the rotary compressor according to the embodiment. Detailed implementation mode

[0029] Figure 1 It is a schematic cross-sectional view of the rotary compressor according to the embodiment. Figure 2 It is made by using Figure 1 Schematic cross-sectional view of the compression mechanism portion cut along line A-A.

[0030] Figure 1 The rotary compressor is a rotary compressor with an injection mechanism. The rotary compressor has a structure in which a compression mechanism portion 2, a motor portion 3, and a rotary shaft 4 that transmits the driving force of the motor portion 3 to the compression mechanism portion 2 are arranged in a sealed container 1. Here, a double-rotary rotary compressor in which the compression mechanism portion 2 has two cylinders is taken as an example for explanation, but it is not limited thereto, and the number of cylinders may be one or three or more. In the following description, the longitudinal direction (the up-and-down direction in the figure) of the sealed container 1, that is, the direction in which the rotary shaft 4 extends, is referred to as the axial direction, the direction perpendicular to the axial direction is referred to as the radial direction, and the direction around the rotary shaft 4 is referred to as the circumferential direction.

[0031] The rotary compressor rotates the rotary shaft 4 by the motor portion 3 and compresses the refrigerant by driving the compression mechanism portion 2. The refrigerant is sucked into the sealed container 1 through the suction muffler 8, and after being compressed by the compression mechanism portion 2, it becomes a high-temperature and high-pressure gas and is discharged into the sealed container 1. The refrigerant gas discharged into the sealed container 1 is discharged into the refrigerant circuit through the gap of the motor portion 3 from the discharge pipe 5.

[0032] The lower part of the closed container 1 forms an oil storage section for storing refrigeration oil. The refrigeration oil in the oil storage section is sucked up from a hollow hole axially provided in the rotating shaft 4 in the manner of a centrifugal pump utilizing the rotation of the rotating shaft 4, and the sucked-up refrigeration oil is supplied to each sliding section through an oil supply hole extending from the hollow hole toward the outer peripheral section. Thereby, the gaps between the components are sealed by the refrigeration oil, preventing damage caused by direct contact between the rotating shaft 4, which is a sliding component, and the rotating piston 22 described later, and each component in contact therewith. The sealing by the refrigeration oil also serves to prevent refrigerant leakage.

[0033] The rotating shaft 4 has: a main shaft section 4a, and an eccentric shaft section 4b eccentric with respect to the axis of the main shaft section 4a. Two eccentric shaft sections 4b are provided, the number being the same as the number of cylinder blocks. An oil separator 6 for separating the refrigerant from the refrigeration oil is fitted to the upper part of the rotating shaft 4. The oil separator 6 is configured in a disc shape and is provided at a position where the mixed fluid of the refrigerant and the refrigeration oil flowing from the compression mechanism section 2 toward the discharge pipe 5 collides. The mixed fluid is separated into the refrigerant and the refrigeration oil by colliding with the oil separator 6. By separating the refrigerant from the refrigeration oil by the oil separator 6, it is possible to prevent the refrigeration oil from being discharged to the outside of the compressor together with the refrigerant discharged from the compression mechanism section 2 through the discharge pipe 5. As a result, sintering of the sliding section caused by exhaustion of the oil in the closed container 1 is prevented.

[0034] The electric motor section 3 includes a stator 3a and a rotor 3b. The rotating shaft 4 is fixed to the rotor 3b and rotates by the rotation of the rotor 3b, transmitting rotational power to the compression mechanism section 2.

[0035] The compression mechanism section 2 includes: a first compression section 20A, a second compression section 20B, an upper bearing 10 disposed on the upper end surface of the first compression section 20A, a lower bearing 11 disposed on the lower end surface of the second compression section 20B, and an intermediate plate 12. The end of an injection pipe 7 that penetrates the closed container 1 from the outside is connected to the intermediate plate 12. Hereinafter, when the first compression section 20A and the second compression section 20B are not distinguished, they are sometimes collectively referred to as the compression section 20.

[0036] The upper bearing 10 has: a hollow cylindrical bearing section 10a that supports the rotating shaft 4 so as to be rotatable, and a flat annular end plate 10b that closes the upper end surface of a cylinder block 21 described later. Similarly, the lower bearing 11 has: a hollow cylindrical bearing section 11a that supports the rotating shaft 4 so as to be rotatable, and a flat annular end plate 11b that closes the lower end surface of the cylinder block 21 described later.

[0037] An outlet (not shown) is formed in the end plate 10b of the upper bearing 10 and the end plate 11b of the lower bearing 11. An upper discharge muffler 13 and a lower discharge muffler 14 are provided so as to cover the outlet. The upper discharge muffler 13 and the lower discharge muffler 14 reduce the noise amplified by the resonance of the space inside the sealed container 1.

[0038] Next, the structures of the first compression part 20A and the second compression part 20B of the compression mechanism part 2 will be described. Since the first compression part 20A and the second compression part 20B have substantially the same structure, the following description will be given taking the first compression part 20A as a representative.

[0039] The first compression part 20A includes: a cylindrical cylinder block 21 having a through hole penetrating in the axial direction ( Figure 1 the vertical direction); a rotary piston 22 rotatably mounted on the eccentric shaft portion 4b of the rotary shaft 4 and eccentrically rotating in the cylinder chamber; and a vane 23. The first compression part 20A further includes a sealing plate 40 separately provided from the rotary piston 22. Upper bearings 10 and an intermediate plate 12 are arranged on both end faces in the axial direction of the cylinder block 21. The through hole of the cylinder block 21 is blocked by the end plate 10b of the upper bearing 10 and the intermediate plate 12, thereby forming a cylinder chamber 24 inside the cylinder block 21. In this way, the end plate 10b of the upper bearing 10 and the intermediate plate 12 function as end plates for blocking the through hole.

[0040] As Figure 2 shown, a vane groove 23a extending in the radial direction is formed in the cylinder block 21, and in this vane groove 23a, the vane 23 is arranged so as to be able to slide in the radial direction. The vane 23 projects into the cylinder chamber 24, and the front end portion of the vane 23 abuts against the rotary piston 22, thereby dividing the inside of the cylinder chamber 24 into a suction chamber 24a and a compression chamber 24b.

[0041] An inlet 26 communicating with the suction chamber 24a is formed on the inner peripheral surface 22c of the cylinder block 21, and the refrigerant from the suction muffler 8 is guided to the suction chamber 24a via the inlet 26. In addition, an outlet 27 communicating with the compression chamber 24b is formed on the inner peripheral surface 22c of the cylinder block 21, and the refrigerant compressed to the discharge pressure in the compression chamber 24b is discharged from the outlet 27.

[0042] As Figure 1As shown, the compression mechanism section 2 further includes an injection flow path 30 that guides the injection refrigerant, which is a liquid refrigerant or a gas refrigerant at an intermediate pressure, to the compression chamber 24b. The injection flow path 30 is formed in the intermediate plate 12. Specifically, the injection flow path 30 is a flow path that introduces the injection refrigerant into the compression chambers 24b of the first compression section 20A and the second compression section 20B. The injection ports 30a located at the downstream end of the injection flow path 30 are opened on the upper and lower end faces of the intermediate plate 12. The injection refrigerant flowing in from the outside is introduced into the compression chambers 24b of the first compression section 20A and the second compression section 20B from the respective injection ports 30a. In addition, a space 50 for storing refrigerating oil and refrigerant is provided on the inner peripheral side of the rotary piston 22 and at the stepped portion between the main shaft portion 4a and the eccentric shaft portion 4b.

[0043] Next, the operation of the rotary compressor will be described.

[0044] When power is supplied to the motor section 3, the rotating shaft 4 fixed to the rotor 3b rotates, and the refrigerant is sucked from the refrigerant circuit through the suction muffler 8 into the suction chamber 24a in the cylinder block 21 via the suction port 26. The refrigerant sucked into the suction chamber 24a is compressed by the eccentric rotational movement of the rotary piston 22. The refrigerant compressed to a high pressure is discharged from the compression chamber 24b via the discharge port 27 and a discharge port (not shown) formed in the upper bearing 10 into the closed container 1. The refrigerant gas discharged into the closed container 1 is discharged to the refrigerant circuit outside the compressor through the discharge pipe 5.

[0045] In addition, the injection refrigerant flowing into the injection pipe 7 from the external refrigerant circuit is injected from the injection port 30a via the injection flow path 30 into the cylinder chamber 24. The injection of the injection refrigerant into the cylinder chamber 24 is performed when the injection port 30a faces the cylinder chamber 24. The injection of the injection refrigerant into the cylinder chamber 24 is performed within a specific rotational phase range corresponding to the position of the injection port 30a during one rotation of the rotary piston 22.

[0046] However, in the existing rotary compressor, in the case where the diameter of the injection port is increased in order to increase the injection amount, the following structure is made to function as a structure for preventing the injection port from facing the space inside the inner peripheral surface of the rotary piston. That is, on the contact surface side of the rotary piston with respect to the injection port, a ring-shaped sealing portion protruding radially inward is integrally provided with the rotary piston. In this structure, the following will be described with reference to the drawings, but there is a limit to the eccentricity of the eccentric shaft portion, and the eccentricity cannot be enlarged to the maximum.

[0047] Therefore, in the present embodiment, by using the sealing plate 40, it is possible to prevent the injection port 30a from facing the space 50 inside the inner peripheral surface 22c of the rotary piston 22 (refer to Figure 1), and can magnify the eccentricity of the eccentric shaft portion 4b to the maximum. Hereinafter, first, the structure and function of the sealing plate 40 will be described, and then, the point that can magnify the eccentricity of the eccentric shaft portion 4b to the maximum will be described.

[0048] Figure 3 It is a view showing the sealing plate of the rotary compressor according to the embodiment. Figure 3 In (a) is a top view, Figure 3 In (b) is a cross-sectional view. Figure 4 It is Figure 3 An explanatory view of the arrangement portion of the sealing plate, and is a view showing the rotary piston of the first compression portion. Figure 4 In (a) is a top view, Figure 4 In (b) is a cross-sectional view. Figure 5 It is in Figure 4 The rotary piston of Figure 3 is provided with Figure 5 In (a) is a top view, Figure 5 In (b) is a cross-sectional view. In addition, in Figure 5 In (a), in order to clarify the position of the sealing plate portion, hatching is applied to the sealing plate portion.

[0049] As Figure 3 shown, the sealing plate 40 has a circular outer shape and has a through hole 41 through which the main shaft portion 4a of the rotary shaft 4 passes, and the through hole 41 is open to the radially outer side. In other words, the sealing plate 40 has a shape formed by cutting a part of a ring-shaped member. As Figure 4 shown, on the end faces 22a on both axial ends of the rotary piston 22 on the side of the injection port 30a, a ring-shaped recess 22b coaxial with the rotary piston 22 is formed. In this recess 22b, the sealing plate 40 is arranged to be rotatable.

[0050] The sealing plate 40 abuts against the intermediate plate 12 in a state of being arranged in the recess 22b. The sealing plate 40 has a portion that protrudes inward from the inner peripheral surface 22c of the rotary piston 22, and blocks the portion of the injection port 30a that is located inward of the inner peripheral surface 22c of the rotary piston 22 through this protruding portion.

[0051] As Figure 5 shown, the main shaft portion 4a of the rotary shaft 4 passes through the through hole 41 at a position closer to the open side of the through hole 41 of the sealing plate 40 than the central axis O of the rotary piston 22.

[0052] In addition, although the sealing plate 40 is rotatably arranged in the recess 22b, it does not rotate once in the recess 22b. When the sealing plate 40 rotates in the recess 22b, the linear inner surface 41a of the open side of the through hole 41 abuts against the outer peripheral surface of the main shaft portion 4a, thereby adjusting the rotation range of the sealing plate 40. The purpose of adjusting the rotation range is to adjust the posture of the sealing plate 40 when the rotary piston 22 rotates eccentrically. In view of this point, the following Figure 6 Provide explanation.

[0053] Next, the operation of the sealing plate 40 configured as described above will be described. Figure 6 is a diagram showing the compression action of the rotary compressor of the embodiment, and is a diagram showing the compression action of the rotary compressor of the embodiment Figure 1 A simplified cross-sectional view of the compression mechanism portion cut along line AA.

[0054] First, the operation of the rolling piston 22 will be described. Figure 6 3 shows a state where the rotation phase of the rotating shaft 4 advances to 0°, 90°, 180°, and 270°, and the rolling piston 22 performs eccentric rotational motion while contacting the inner peripheral surface of the cylinder 21 .

[0055] The sealing plate 40 also performs eccentric rotational motion in conjunction with the eccentric rotational motion of the rotating piston 22. The sealing plate 40 can rotate relative to the rotating piston 22, but its rotation range is adjusted. Therefore, the sealing plate 40 keeps the open side of the through hole 41 facing the eccentric shaft portion 4b (at Figure 6 Not shown in the figure, refer to Figure 5 Specifically, when the rotation phase is 0°, the sealing plate 40 becomes the open side of the through hole 41 facing the eccentric side of the through hole 41. Figure 6 In other words, the open side of the through hole 41 is oriented in the eccentric direction of the eccentric shaft portion 4b ( Figure 6 When the rotation phase is 90°, the seal plate 40 is rotated 90° counterclockwise from the rotation phase 0°. Similarly, as the phase advances to the rotation phase 180° and the rotation phase 270°, the seal plate 40 is rotated 90° counterclockwise.

[0056] When the rotation phase is 0°, the injection port 30a faces the suction chamber 24a where suction has just been completed. When the rotation phase is 90°, the injection port 30a faces the compression chamber 24b, and a part of the injection port 30a is blocked by the rotary piston 22. Then, when the rotation phase is 180°, the injection port 30a faces the inside of the inner peripheral surface 22c of the rotary piston 22. However, the injection port 30a is blocked by the sealing plate 40. That is, even when the injection port 30a is located inside the inner peripheral surface 22c of the rotary piston 22, it can be blocked by the sealing plate 40. Then, when the rotation phase is 270°, the injection port 30a is blocked by the rotary piston 22 itself.

[0057] Thus, by providing the sealing plate 40, even when the injection port 30a is located inside the inner peripheral surface 22c of the rotary piston 22, the injection port 30a can be blocked by the sealing plate 40. Therefore, during injection, the injected refrigerant does not flow into the cylinder chamber 24, and it is possible to suppress the performance degradation caused by the inflow into the void 50 (refer to Figure 1 ). At the same time, it is also possible to suppress the deterioration of reliability caused by the injected refrigerant blowing away the refrigeration oil stored in the void 50 and thus reducing the lubrication ability. In addition, even when injection is not performed, it is possible to suppress the refrigeration oil stored in the void 50 from flowing out through the injection port 30a into the injection flow path 30, and it is possible to suppress the deterioration of reliability.

[0058] In addition, by providing the sealing plate 40, regardless of the size of the injection port 30a, the communication between the injection port 30a and the inside of the inner peripheral surface 22c of the rotary piston 22 can be avoided. Therefore, it is possible to increase the diameter of the injection port 30a and increase the injection amount.

[0059] In addition, since it is no longer necessary to reduce the arrangement position to a position where such communication can be avoided when determining the arrangement position of the injection port 30a, the design freedom of the arrangement position of the injection port 30a is improved. Regarding the point where the design freedom of the arrangement position of the injection port 30a is improved, the following Figure 7 is used for explanation.

[0060] Figure 7 is an explanatory diagram of the configurable area of the injection port in the rotary compressor of the embodiment.

[0061] In Figure 7In [the figure], the annular region 60 shown by the cross-hatching is a region formed inside the inner peripheral surface 22c of the rotary piston 22 where the injection port 30a faces during the eccentric rotary motion of the rotary piston 22. Therefore, in a configuration without the sealing plate 40, it is necessary to arrange the injection port 30a while avoiding this annular region 60. Specifically, it is necessary to arrange the injection port 30a in a region outside the outer periphery of the annular region 60. In addition, since the region inside the inner periphery of the annular region 60 is a region blocked by the rotary piston 22 at all rotation phases, it is a region where the injection port 30a cannot be arranged.

[0062] In contrast, in the present embodiment, by providing the sealing plate 40, even if the injection port 30a is located in this annular region 60, the injection port 30a can be blocked by the sealing plate 40. Therefore, this annular region 60 is also included in the region where the injection port 30a can be arranged, and the design freedom of the arrangement position of the injection port 30a is increased.

[0063] Next, the existing configuration and the present embodiment will be compared and described for the point where the eccentricity of the eccentric shaft portion 4b can be maximized by providing the sealing plate 40.

[0064] Figure 8 It is an explanatory diagram of the eccentricity of the eccentric shaft portion of the existing configuration. In Figure 8 An example of applying the existing configuration to a rotary compressor having two cylinders is shown. Figure 9 It is Figure 8 A partial enlarged view of Figure 10 It is an explanatory diagram of the eccentricity of the eccentric shaft portion in the rotary compressor of the present embodiment. Figure 11 It is Figure 10 A partial enlarged view of

[0065] First, as a comparative example, the existing configuration will be described. As shown in Figure 8 and Figure 9 In the existing configuration, at the end of the rotary piston 122 on the side of the injection port 130a, an annular sealing portion 140 protruding radially inward is integrally provided. The sealing portion 140 surrounds in a ring shape without a break, and as shown in Figure 9 has a radial thickness w over the entire circumference. Since the rotary shaft 104 passes through the inside of the annular sealing portion 140, at least a gap of the amount of the thickness w of the sealing portion is generated between the outer peripheral surface 104aa of the main shaft portion 104a and the inner peripheral surface 122a of the rotary piston 122, and the eccentric shaft portion 104b is arranged so as to fill this gap. Therefore, it is necessary to be on the side opposite to the eccentric side of the eccentric shaft portion 104b ( Figure 9 the left side of Figure 9On the right side) ensures the position of the eccentric shaft portion 104b by an amount equal to the radial thickness w of the seal portion 140. Therefore, on the eccentric side of the eccentric shaft portion 104b, the distance between the inner peripheral surface 122a of the rotary piston 122 and the outer peripheral surface 104aa of the main shaft portion 104a becomes α.

[0066] In contrast, in the structure of the present embodiment, the through hole 41 through which the main shaft portion 4a of the rotary shaft 4 passes in the seal plate 40 opens radially outward. Therefore, the main shaft portion 4a of the rotary shaft 4 can be arranged close to the open side of the through hole 41 to a position in contact with the inner peripheral surface 22c of the rotary piston 22. Therefore, it is not necessary to ensure the amount of w on the side opposite to the eccentric side of the eccentric shaft portion required in the existing structure. Therefore, as Figure 10 and Figure 11 shown, the radial end of the main shaft portion 4a and the radial end of the eccentric shaft portion 4b can be made the same surface, and the structure is such that the outer peripheral surface 4aa of the main shaft portion 4a is in contact with the inner peripheral surface 22c of the rotary piston 22.

[0067] Thus, in the structure of the present embodiment, it can be configured that on the eccentric side of the eccentric shaft portion 4b ( Figure 11 on the left side), the distance β between the inner peripheral surface 22c of the rotary piston 22 and the outer peripheral surface 4aa of the main shaft portion 4a can be made larger than the distance α in the existing structure, and the eccentricity of the eccentric shaft portion 4b can be amplified to the maximum. In addition, in Figure 10 and Figure 11 , a structure in which the eccentricity of the eccentric shaft portion 4b is amplified to the maximum is shown, but whether it is amplified to the maximum is arbitrary. In short, according to the structure of the present embodiment, the main shaft portion 4a of the rotary shaft 4 can be arranged close to the open side of the through hole 41, and thus the eccentricity of the eccentric shaft portion 4b can be adjusted to the maximum corresponding to the position of the main shaft portion 4a of the rotary shaft 4 in the through hole 41.

[0068] If the eccentricity of the eccentric shaft portion 4b is defined as the displacement amount of the eccentric shaft portion 4b starting from the position coaxial with the main shaft portion 4a, the maximum eccentricity of the structure of the present embodiment is equivalent to the difference between the radius of the main shaft portion 4a and the radius of the eccentric shaft portion 4b. Therefore, according to the structure of the present embodiment, it can be configured that the eccentric shaft portion 4b of the rotary shaft 4 eccentrically moves from the position coaxial with the main shaft portion 4a to the side opposite to the open side of the through hole 41 within the range of the difference between the radius of the main shaft portion 4a and the radius of the eccentric shaft portion 4b.

[0069] Next, the assemblability will be described. The sealing plate 40 of the present embodiment has a through-hole 41 that opens radially outward, and is not a blocked ring shape, but a ring shape with a part cut. By making the sealing plate 40 into a ring shape with a part cut in this way, compared with the case of being a blocked ring shape, the effect of improving the assemblability can also be obtained. Hereinafter, the existing structure and the present embodiment will be compared and described.

[0070] Figure 12 It is an explanatory view of the assembly process of a double-rotary compressor with an existing structure, and is a view showing the state before the rotary piston is installed. Figure 13 It is an explanatory view of the assembly process of a double-rotary compressor with an existing structure, and is a view showing the state after the rotary piston is installed. Figure 14 It is an explanatory view of the assembly process of the rotary compressor of the embodiment. In addition, in Figures 12 to 14 the illustration of the intermediate plate is omitted. Since the intermediate plate has an inner diameter larger than the outer diameter of the eccentric shaft portion, it is arranged so that the eccentric shaft portion can pass through the inside of the intermediate plate. The intermediate plate can be arranged at any time before the rotary piston is arranged on the eccentric shaft portion.

[0071] In a double-rotary compressor having two cylinder bodies, in the case of a structure in which both injection ports facing the compression chambers of the two cylinder bodies are provided in the intermediate plate, in the existing structure, assembly is actually impossible. That is, during the assembly of the existing structure, as Figure 12 shown, the respective rotary pistons 122 are arranged from both end sides of the rotary shaft 104 having two eccentric shaft portions 104b. Here, the inner diameter w1 of the sealing portion 140 is smaller than the outer diameter w2 of the eccentric shaft portion 104b. Therefore, as Figure 13 shown, each sealing portion 140 cannot pass through each eccentric shaft portion 104b, and the rotary piston 122 cannot be arranged on the outer periphery of the eccentric shaft portion 4b.

[0072] On the contrary, in the structure of the present embodiment, since the sealing plate 40 has a through-hole 41 and is a ring shape with a part cut, the degree of freedom in setting is high and assembly can be performed. That is, as Figure 14 shown, with respect to the rotary shaft 4 having two eccentric shaft portions 4b, the through-hole 41 of the sealing plate 40 can be used to arrange it in the concave portion 22b of the rotary piston 22 from the side of the rotary shaft 4, and the assemblability is easy.

[0073] In addition, in the above, the structure in which both of the two injection ports 30a are formed in the intermediate plate 12 is shown, but the structure is not limited to this. For other structural examples, the following Figures 15 to 17 will be described.

[0074] Figure 15 It is a view showing a first modification of the rotary compressor of the embodiment. Figure 16This is a diagram showing a second modification example of the rotary compressor according to the embodiment. Figure 17 This is a diagram showing a third modification example of the rotary compressor according to the embodiment.

[0075] As Figure 15 shown, the injection port 30a on the first compression part 20A side may be formed on the end plate 10b of the upper bearing 10, and the injection port 30a on the second compression part 20B side may be formed on the end plate 11b of the lower bearing 11. Additionally, as Figure 16 shown, the injection port 30a on the first compression part 20A side may be formed on the end plate 10b of the upper bearing 10, and the injection port 30a on the second compression part 20B side may be formed on the intermediate plate 12. Moreover, as Figure 17 shown, the injection port 30a on the first compression part 20A side may be formed on the intermediate plate 12, and the injection port 30a on the second compression part 20B side may be formed on the end plate 11b of the lower bearing 11.

[0076] In short, it is also possible that both of the two injection ports 30a are formed on the intermediate plate 12, or are respectively formed on the end plates 10b and 11b, or one is formed on one of the end plates 10b and 11b and the other is formed on the intermediate plate 12.

[0077] As described above, the rotary compressor of the present embodiment includes a compression mechanism unit 2 that compresses a refrigerant in a compression chamber 24b, and injects a refrigerant at an intermediate pressure from an injection port 30a into the compression chamber 24b of the compression mechanism unit 2. The compression mechanism unit 2 includes: a rotating shaft 4 having a main shaft portion 4a and an eccentric shaft portion 4b; a cylinder block 21 having a cylinder chamber 24; and a rotating piston 22 mounted on the eccentric shaft portion 4b of the rotating shaft 4 and eccentrically rotating in the cylinder chamber 24. Additionally, the compression mechanism unit 2 includes: two end plates 10b and 11b disposed at both axial ends of the cylinder block 21 on the rotating shaft 4; and a vane 23 protruding into the cylinder chamber 24 of the cylinder block 21 and forming a compression chamber 24b in the cylinder chamber 24 by abutting against the rotating piston 22. The compression mechanism unit 2 further includes a sealing plate 40 that is linked to the eccentric rotation of the rotating piston 22 and blocks a portion of the injection port 30a formed in one of the two end plates 10b and 11b, which is located inside the inner peripheral surface 22c of the rotating piston 22. The sealing plate 40 is separately provided from the rotating piston 22 and is rotatable relative to the rotating piston 22, and has a through-hole 41 through which the main shaft portion 4a of the rotating shaft 4 passes, and the through-hole 41 opens radially outward.

[0078] Thus, the rotary compressor has a sealing plate 40 that blocks a portion of the injection port 30a located on the inner side of the inner peripheral surface of the rotary piston 22, and has a structure that prevents the injection port 30a from facing the inner side of the rotary piston 22. Further, the sealing plate 40 is provided separately from the rotary piston 22 and is rotatable relative to the rotary piston 22, and has a through-hole 41 through which the main shaft portion 4a of the rotary shaft 4 passes, and the through-hole 41 opens to the radially outer side. Thus, since the through-hole 41 opens to the radially outer side, the main shaft portion 4a of the rotary shaft 4 can be arranged close to the open side of the through-hole 41, and the eccentricity of the eccentric shaft portion 4b of the rotary shaft 4 can be adjusted corresponding to the position of the main shaft portion 4a of the rotary shaft 4 in the through-hole 41. Therefore, when the main shaft portion 4a approaches the open side of the through-hole 41 until it abuts against the inner peripheral surface of the rotary piston 22, the eccentricity of the eccentric shaft portion 4b of the rotary shaft 4 can be maximized.

[0079] In addition, in the present embodiment, the main shaft portion 4a of the rotary shaft 4 passes through the through-hole 41 at a position closer to the open side of the through-hole 41 of the sealing plate 40 than the central axis of the rotary piston 22. The eccentric shaft portion 4b of the rotary shaft 4 is eccentric from a position coaxial with the main shaft portion 4a in a range not exceeding the difference between the radius of the main shaft portion 4a and the radius of the eccentric shaft portion 4b, toward the side opposite to the open side of the through-hole 41.

[0080] As a result, a rotary compressor can be obtained in which the eccentricity of the eccentric shaft portion 4b of the rotary shaft 4 is adjusted within a range not exceeding the difference between the radius of the main shaft portion 4a and the radius of the eccentric shaft portion 4b.

[0081] In the present embodiment, the sealing plate 40 is linked to the eccentric rotation of the rotary piston 22 while maintaining the posture in which the open side of the through-hole 41 faces the side opposite to the eccentric direction of the eccentric shaft portion 4b.

[0082] As a result, the portion of the injection port 30a located on the inner side of the inner peripheral surface 22c of the rotary piston 22 can be blocked by the sealing plate 40.

[0083] In the present embodiment, the compression mechanism section 2 has two compression sections in the axial direction. Each compression section includes a cylinder block 21, a rotary piston 22, and a vane 23. In addition to the two end plates 10b and 11b, an intermediate plate 12 is provided as another end plate 10b. When one of the two compression sections in the axial direction is defined as the first compression section 20A and the other is defined as the second compression section 20B, end plates 10b are respectively arranged on one axial side of the first compression section 20A and the other axial side of the second compression section 20B, and the intermediate plate 12 is arranged between the first compression section 20A and the second compression section 20B. Two injection ports 30a for guiding the refrigerant at an intermediate pressure to the compression chambers 24b of the two compression mechanism sections 2 are both formed in the intermediate plate 12, or are respectively formed in the two end plates 10b and 11b, or one is formed in one of the two end plates 10b and 11b and the other is formed in the intermediate plate 12.

[0084] In this way, the compression mechanism section 2 can also be configured to include two compression sections. In the case of this structure, the injection ports 30a corresponding to the respective compression sections can be such that both injection ports 30a are formed in the intermediate plate 12, or are respectively formed in the two end plates 10b and 11b, or one is formed in one of the two end plates 10b and 11b and the other is formed in the intermediate plate 12.

[0085] Description of reference numerals:

[0086] 1... Hermetic container; 2... Compression mechanism section; 3... Motor section; 3a... Stator; 3b... Rotor; 4... Rotating shaft; 4a... Main shaft section; 4aa... Outer peripheral surface; 4b... Eccentric shaft section; 5... Discharge pipe; 6... Oil separator; 7... Injection pipe; 8... Suction muffler; 10... Upper bearing; 10a... Bearing section; 10b... End plate; 11... Lower bearing; 11a... Bearing section; 11b... End plate; 12... Intermediate plate; 13... Upper discharge muffler; 14... Lower discharge muffler; 20... Compression section; 20A... First compression section; 20B... Second compression section; 21... Cylinder block; 22... Rotary piston; 22a... End face; 22b... Concave portion; 22c... Inner peripheral surface; 23... Vane; 23a... Vane groove; 24... Cylinder chamber; 24a... Suction chamber; 24b... Compression chamber; 26... Suction port; 27... Discharge port; 30... Injection flow path; 30a... Injection port; 40... Sealing plate; 41... Through hole; 41a... Inner surface; 50... Void; 60... Annular region; 104... Rotating shaft; 104a... Main shaft section; 104aa... Outer peripheral surface; 104b... Eccentric shaft section; 122... Rotary piston; 122a... Inner peripheral surface; 130a... Injection port; 140... Sealing portion.

Claims

1. A rotary compressor includes a compression mechanism portion that compresses a refrigerant through a compression chamber, and injects a refrigerant at an intermediate pressure into the compression chamber of the compression mechanism portion from an injection port. It is characterized in that the compression mechanism portion includes: a rotating shaft having a main shaft portion and an eccentric shaft portion; and a cylinder block having a cylinder chamber; a rotating piston mounted on the eccentric shaft portion of the rotating shaft and eccentrically rotating in the cylinder chamber; two end plates disposed at both end faces of the cylinder block in the axial direction of the rotating shaft; a vane protruding into the cylinder chamber of the cylinder block and forming the compression chamber in the cylinder chamber by abutting against the rotating piston; and a sealing plate that is linked to the eccentric rotation of the rotating piston and blocks a portion of the injection port formed in one of the two end plates that is located inside the inner peripheral surface of the rotating piston; the sealing plate is separately provided from the rotating piston and is relatively rotatable with respect to the rotating piston, and has a through hole through which the main shaft portion of the rotating shaft passes, and the through hole opens to the radially outer side.

2. The rotary compressor according to claim 1, It is characterized in that the main shaft portion of the rotating shaft passes through the through hole at a position closer to the open side of the through hole of the sealing plate than the central axis of the rotating piston, the eccentric shaft portion of the rotating shaft eccentrically moves from a position coaxial with the main shaft portion to the side opposite to the open side of the through hole within a range not exceeding the difference between the radius of the main shaft portion and the radius of the eccentric shaft portion.

3. The rotary compressor according to claim 1 or 2, It is characterized in that the sealing plate is linked to the eccentric rotation of the rotating piston while maintaining the posture in which the open side of the through hole faces the side opposite to the eccentric direction of the eccentric shaft portion.

4. The rotary compressor according to any one of claims 1 to 3, It is characterized in that the compression mechanism portion includes two compression portions in the axial direction, each compression portion includes the cylinder block, the rotating piston and the vane, and in addition to the two end plates, an intermediate plate is provided as another end plate, when one of the two compression portions in the axial direction is defined as the first compression portion and the other is defined as the second compression portion, the end plates are respectively disposed on the one side in the axial direction of the first compression portion and the other side in the axial direction of the second compression portion, and the intermediate plate is disposed between the first compression portion and the second compression portion, both of the two injection ports for guiding the refrigerant at the intermediate pressure to the compression chambers of the two compression portions are formed in the intermediate plate, or are respectively formed in the two end plates, or one is formed in one of the two end plates and the other is formed in the intermediate plate.

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