CN112204260A

CN112204260A - Hermetic compressor and method of manufacturing hermetic compressor

Info

Publication number: CN112204260A
Application number: CN201880092732.4A
Authority: CN
Inventors: 井垣夏纪; 赤堀康之
Original assignee: Mitsubishi Electric Corp
Current assignee: Mitsubishi Electric Corp
Priority date: 2018-06-07
Filing date: 2018-06-07
Publication date: 2021-01-08
Anticipated expiration: 2038-06-07
Also published as: KR20210002651A; WO2019234881A1; CZ309180B6; CN112204260B; CZ2020626A3; JP7012843B2; JPWO2019234881A1; KR102427373B1

Abstract

The hermetic compressor comprises: a closed container; a hollow cylinder housed in the closed container; a rolling piston that eccentrically rotates; a vane dividing a space in the cylinder body into a suction chamber and a compression chamber; a spring for urging the vane toward the side where the rolling piston is disposed; a cylindrical spring guide protruding from the closed container, forming a hollow portion for housing the spring, and defining the expansion and contraction direction of the spring; and a protruding container protruding from the closed container, forming a closed space together with the closed container, housing a spring guide therein, forming an insertion hole in the cylinder into which the spring is inserted, one end of the spring guide being fixed to the cylinder and the hollow portion communicating with the insertion hole, the other end being closed by a bottom cover, the spring being disposed between a back-surface-side end of the vane on the opposite side of the rolling piston and the bottom cover.

Description

Hermetic compressor and method of manufacturing hermetic compressor

Technical Field

The present invention relates to a sealed compressor used in a refrigeration cycle of an air conditioner, a refrigerator, a freezer, or the like, and a method for manufacturing the sealed compressor.

Background

Some conventional hermetic compressors include a rotary compressor that compresses a refrigerant by a combination of a piston and a cylinder that rotate. The rotary compressor houses a piston in a cylinder, and a vane urged by a spring abuts against the piston to form a compression chamber in the cylinder. A spring for biasing the vane is housed in a spring insertion hole formed in the cylinder, and the spring is held by the cylinder. However, in the structure in which the spring is held by the cylinder, the interval between the back surface of the blade and the closed vessel is narrow. Therefore, when the vane reaches the top dead center of the reciprocating motion, the entire length of the spring reaches approximately the close contact length of the spring, and stress generated by the spring increases, which may cause fatigue fracture of the spring. In view of this, in order to reduce stress generated in the spring, a hermetic compressor in which a protruding container is provided in a hermetic container to extend an installation interval of the spring has been proposed (for example, patent document 1). In addition, in recent years, the stroke volume of the hermetic compressor is increased and the amount of expansion and contraction of the spring that slides the vane is limited, and therefore, it is increasingly important to ensure the amount of expansion and contraction of the spring that slides the vane.

Patent document 1: japanese patent laid-open publication No. 63-16189

The hermetic compressor of patent document 1 is provided with a protruding container protruding from a hermetic container, and a spring is disposed in the protruding container. However, in the hermetic compressor of patent document 1, if the assembly accuracy of the hermetic container and the cylinder is poor, the positional relationship between the spring and the vane may be deviated, for example, the spring may be twisted when the spring expands and contracts, and the spring may not expand and contract as designed.

Disclosure of Invention

The present invention has been made to solve the above-described problems, and an object of the present invention is to provide a sealed compressor and a method of manufacturing the sealed compressor, in which the accuracy of the positional relationship between a spring and a vane is ensured while the amount of expansion and contraction of the spring for sliding the vane used in the sealed compressor is ensured.

The present invention relates to a sealed compressor, which comprises: a closed container; a hollow cylinder housed in the closed container; a rolling piston eccentrically rotating along an inner circumferential wall of the cylinder; vanes contacting the outer peripheral wall of the rolling piston to divide the space inside the cylinder into suction chamber and compression chamber; a spring for urging the vane toward the side where the rolling piston is disposed; a cylindrical spring guide protruding from the closed container, forming a hollow portion for housing the spring, and defining the expansion and contraction direction of the spring; and a protruding container protruding from the closed container, forming a closed space together with the closed container, housing a spring guide therein, forming an insertion hole in the cylinder into which the spring is inserted, one end of the spring guide being fixed to the cylinder, the hollow portion communicating with the insertion hole, the other end being closed by a bottom cover, the spring being disposed between a back-surface-side end of the vane on the opposite side of the rolling piston and the bottom cover.

The present invention relates to a hermetic compressor including a cylindrical spring guide that protrudes from a hermetic container, forms a hollow portion that houses a spring, and defines a direction in which the spring expands and contracts. One end of the spring guide is fixed to the cylinder, the hollow portion communicates with a spring insertion hole formed in the cylinder, and the other end is closed by the bottom cover. The spring is disposed between a back-side end of the vane on the opposite side of the rolling piston and the bottom cover. Therefore, the spring of the hermetic compressor is disposed between the rear-side end of the vane and the bottom cover of the spring guide protruding from the hermetic container, and thus the amount of expansion and contraction of the spring can be secured as compared with the case where the spring is disposed between the rear-side end of the vane and the hermetic container. In addition, in the hermetic compressor, the spring guide is directly fixed to the cylinder, and thus the spring holding member for the cylinder is only the spring guide, and the positional accuracy between the spring and the vane can be ensured.

Drawings

Fig. 1 is a longitudinal sectional view of a hermetic compressor according to embodiment 1 of the present invention.

Fig. 2 is a schematic sectional view of the upper cylinder in the compression mechanism portion of fig. 1 taken along line a-a.

Fig. 3 is a flowchart showing a manufacturing process of the hermetic compressor of fig. 1.

Fig. 4 is a schematic cross-sectional view of a modification of the protruding container shown in fig. 2.

Fig. 5 is a longitudinal sectional view of a hermetic compressor according to embodiment 2 of the present invention.

Detailed Description

Hereinafter, the sealed compressor 100 and the sealed compressor 110 according to the embodiment of the present invention will be described with reference to the drawings and the like. In the following drawings including fig. 1, the relative dimensional relationships and shapes of the respective components may differ from the actual conditions. In the drawings, the same or corresponding structures denoted by the same reference numerals are the same as those in the drawings described below, and are common throughout the specification. For the sake of easy understanding, terms indicating directions (for example, "upper", "lower", "right", "left", "front", "rear", and the like) are used as appropriate, but these terms are described only for convenience of description, and do not limit the arrangement and directions of the devices or components.

Embodiment 1.

[ sealed compressor 100]

Fig. 1 is a longitudinal sectional view of a sealed compressor 100 according to embodiment 1 of the present invention. The hermetic compressor 100 is 1 component constituting a refrigeration cycle used in, for example, an air conditioner, a refrigerator, a freezer, a vending machine, a water heater, and the like. The hermetic compressor 100 is a double rotary compressor having 2 compression chambers. The hermetic compressor 100 includes a hermetic container 10, and an electric mechanism 20 and a compression mechanism 30 housed in the hermetic container 10. The hermetic compressor 100 includes an accumulator (accumulator)13 outside the hermetic container 10, and a suction pipe 11 connecting the hermetic container 10 and the accumulator 13. The hermetic compressor 100 further includes a protruding container 50 that houses a spring 36d, and the spring 36d biases a vane 35 described later.

(closed vessel 10)

The hermetic container 10 constitutes an outer shell of the hermetic compressor 100. The closed casing 10 is composed of a substantially cylindrical middle casing 10a, an upper casing 10b closing an opening in the upper part of the middle casing 10a, and a lower casing 10c closing an opening in the lower part of the middle casing 10 a. The closed container 10 is secured in a closed state by fitting the upper container 10b into an upper opening of the intermediate container 10a and fitting the lower container 10c into a lower opening of the intermediate container 10 a. A suction pipe 11 to which an accumulator 13 is attached is connected to the middle tank 10a, and a discharge pipe 12 is connected to the upper tank 10 b. The suction pipe 11 is a connection pipe for feeding the gas refrigerant (low temperature and low pressure) sucked through the accumulator 13 into the compression mechanism 30. The discharge pipe 12 is a connection pipe for discharging the gas refrigerant (high temperature and high pressure) in the closed casing 10 compressed by the compression mechanism section 30 to the outside of the closed casing 10. The closed casing 10 is disposed on the base 14, and the lower casing 10c is fixed to the base 14. The hermetic compressor 100 is normally installed with the pedestal 14 fixed to an installation site by bolts or the like.

(electric mechanism section 20)

The electric mechanism 20 generates a rotational motion to rotate the rotary shaft 32 inside the sealed container 10. The electric mechanism 20 is disposed above the compression mechanism 30 in the closed casing 10. The electric mechanism 20 includes a stator 21 fixed to the inner peripheral wall of the intermediate container 10a, and a rotor 22 rotatably fitted to the inner peripheral side of the stator 21. The stator 21 is fixed to the middle container 10a of the closed container 10 by various fixing methods such as shrink fitting and welding. A rotation shaft 32 extending downward is fixed to a center portion of the rotor 22. The stator 21 rotates the rotor 22 by electric power supplied from the outside of the hermetic compressor 100.

(compression mechanism 30)

The compression mechanism 30 is housed in the closed casing 10, and compresses the refrigerant flowing into the closed casing 10. The compression mechanism 30 is disposed below the electric mechanism 20 and is fixed to the middle tank 10 a. The compression mechanism 30 has a cylinder 31 having a substantially cylindrical shape. The compression mechanism 30 further includes a rotary shaft 32, a rolling piston 33, a vane 35, a spring 36, an upper bearing 38, a lower bearing 39, a partition plate 37, a spring guide 40, and a protruding container 50.

The hermetic compressor 100 has at least 1 hollow cylinder 31 housed in the hermetic container 10 in the compression mechanism section 30. As shown in fig. 1, the sealed compressor 100 may include a plurality of cylinders 31. That is, as shown in fig. 1, the compression mechanism 30 may be configured by a plurality of cylinders 31 of an upper cylinder 31A and a lower cylinder 31B. The cylinder 31 is a general term for a plurality of cylinders such as an upper cylinder 31A and a lower cylinder 31B. In the closed casing 10, the substantially cylindrical upper cylinder 31A is disposed above the substantially cylindrical lower cylinder 31B. An upper bearing 38 is disposed above the upper cylinder 31A so as to contact the upper end surface of the upper cylinder 31A, and the upper bearing 38 blocks the upper end surface of the upper cylinder 31A. A lower bearing 39 is disposed below the lower cylinder 31B so as to contact the lower end surface of the lower cylinder 31B, and the lower bearing 39 closes the lower end surface of the lower cylinder 31B. The partition plate 37 is disposed between the upper cylinder 31A and the lower cylinder 31B, and blocks the lower end surface of the upper cylinder 31A and the upper end surface of the lower cylinder 31B.

Fig. 2 is a schematic sectional view of the upper cylinder 31A of the compression mechanism section 30 of fig. 1 taken along line a-a. Fig. 2 shows a cross section along line a-a in a state rotated 90 degrees counterclockwise. The structure of the compression mechanism 30 will be further described below with reference to fig. 2 and 1. The relationship among the rolling piston 33, the vane 35, and the spring 36 in the upper cylinder 31A is the same as the relationship among the rolling piston 33, the vane 35, and the spring 36 in the lower cylinder 31B. Therefore, in the following description, the upper cylinder 31A and the lower cylinder 31B are not separately described, but the cylinder 31, which is a general name of the upper cylinder 31A and the lower cylinder 31B, is used. In fig. 2, the eccentric portion 32a disposed in the cylinder 31 is not shown.

As shown in fig. 2, the cylinder 31 has a cylindrical peripheral wall portion 31b, and a cylinder chamber 31d concentric with the rotation shaft 32 is formed by an inner peripheral wall 31b1 of the peripheral wall portion 31 b. The rolling piston 33 is disposed inside the peripheral wall portion 31b, and the inner peripheral wall 31b1 of the peripheral wall portion 31b faces the outer peripheral wall 33a of the rolling piston 33 formed in a cylindrical shape. In the peripheral wall portion 31b of the cylinder 31, a vane groove 31e is formed in a radial direction from the inner peripheral wall 31b1 toward the outer peripheral wall 31f side. The vane 35 is slidably disposed in the vane groove 31 e. The cylinder chamber 31d is divided by the vane 35 into a suction chamber 31d1 communicating with the suction port 34 and a compression chamber 31d2 communicating with the discharge port 34B. That is, the cylinder 31 is formed in a cylindrical shape, and a cylinder chamber 31d constituting the suction chamber 31d1 and the compression chamber 31d2 is formed in a space surrounded by the inner peripheral wall 31b1 of the cylinder 31.

In the peripheral wall portion 31b of the cylinder 31, an insertion hole 31g into which the spring 36 is inserted is formed between the vane groove 31e and the outer peripheral wall 31f of the cylinder 31 along the radial direction of the cylinder 31. A spring 36 is inserted into the insertion hole 31g from the outer peripheral wall 31f side, and the spring 36 biases the vane 35 toward the arrangement side of the rolling piston 33. The insertion hole 31g has: an outer peripheral side insertion hole 31g2 formed on the outer peripheral wall 31f side of the cylinder block 31; and an inner peripheral side insertion hole 31g1 formed on the inner peripheral wall 31b1 side of the cylinder 31, that is, on the vane groove 31e side. The sectional shapes of the outer peripheral insertion hole 31g2 and the inner peripheral insertion hole 31g1 are circular. When the diameter of the outer peripheral side insertion hole 31g2 is φ D and the diameter of the inner peripheral side insertion hole 31g1 is φ D, φ D is smaller than φ D (φ D < φ D). That is, the insertion hole 31g has a plurality of portions having different diameters in the central axis direction of the insertion hole 31g from the outer peripheral wall 31f side toward the inner peripheral wall 31b1 side of the cylinder block 31. The insertion hole 31g is formed with a diameter that decreases toward the vane groove 31e between the outer peripheral wall 31f and the vane groove 31 e. The central axis of the outer peripheral insertion hole 31g2 is coaxial with the central axis of the inner peripheral insertion hole 31g1, and both central axes intersect the central axis C of the rotary shaft 32 extending perpendicular to the paper surface.

The peripheral wall portion 31B of the cylinder 31 is formed with a suction port 34 and a discharge port 34B disposed on both sides in the circumferential direction with the vane groove 31e interposed therebetween. The suction pipe 11A is connected to the suction hole 34 of the upper cylinder 31A, and the suction pipe 11B is connected to the suction hole 34 of the lower cylinder 31B. The suction pipe 11 is a generic name of the suction pipe 11A and the suction pipe 11B. The discharge hole 34B is formed radially outward from the inner peripheral wall 31B1 of the cylinder 31, and communicates with the space in the closed casing 10 through a discharge hole (not shown) formed in the upper bearing 38.

As shown in fig. 1, the rotary shaft 32 has an eccentric portion 32a eccentric in one radial direction on one end side in the axial direction. The other end portion side in the axial direction of the rotating shaft 32 is inserted into and fixed to the center portion of the rotor 22 of the electric mechanism unit 20. The rotary shaft 32 is rotatably supported by an upper bearing 38 and a lower bearing 39, and rotates together with the rotor 22.

As shown in fig. 1 and 2, the hermetic compressor 100 includes a rolling piston 33 in the compression mechanism section 30, and the rolling piston 33 eccentrically rotates along the inner peripheral wall 31b1 of the cylinder 31. The rolling piston 33 is located at a position eccentric with respect to the central axis C of the rotary shaft 32, and is attached to the eccentric portion 32a of the rotary shaft 32 in the cylinder chamber 31d so as to rotate together with the rotary shaft 32. The rolling piston 33 eccentrically rotates in the cylinder chamber 31d by the rotation of the rotary shaft 32.

As shown in fig. 1 and 2, the hermetic compressor 100 includes the vane 35 in the compression mechanism section 30, and the vane 35 contacts the outer peripheral wall 33a of the rolling piston 33 to divide the space in the cylinder 31 into the suction chamber 31d1 and the compression chamber 31d 2. The tip end 35a of the vane 35 abuts against the outer peripheral wall 33a of the rolling piston 33 by the biasing force of the spring 36. The vane 35 is slidably in contact with the outer peripheral wall 33a of the rolling piston 33.

As shown in fig. 1 and 2, the hermetic compressor 100 includes a spring 36 in the compression mechanism section 30, and the spring 36 biases the vane 35 toward the arrangement side of the rolling piston 33. As shown in fig. 2, the spring 36 is disposed at the rear-side end 35b of the vane 35 located on the opposite side to the rolling piston 33 in the radial direction of the cylinder 31. The spring 36 is housed in a spring guide 40 described later. The spring 36 is slidably disposed in the hollow portion 40e of the spring guide 40. The spring 36 is a compression coil spring that is compressed to utilize a reaction force, and is a cylindrical coil spring. The spring 36 is preferably a cylindrical coil spring, but is not limited to a cylindrical coil spring. Since the spring 36 is guided by the spring guide 40, it is preferable that the spring 36 has the same outer diameter in the free length direction. Therefore, for example, if the spring guide 40 has an elliptical shape in vertical section, an elliptical coil spring may be used for the spring 36. The spring 36 has one end 36b in the free longitudinal direction fixed to the bottom cover 40c of the spring guide 40, and the other end 36a attached to the rear end 35b of the blade 35. That is, the spring 36 is disposed between the back-side end 35b of the vane 35 located on the opposite side from the rolling piston 33 and the bottom cover 40c of the spring guide 40.

As shown in fig. 1 and 2, the hermetic compressor 100 includes a cylindrical spring guide 40 in the compression mechanism section 30, and the cylindrical spring guide 40 protrudes from the hermetic container 10, forms a hollow portion 40e that houses the spring 36, and defines the expansion and contraction direction of the spring 36. The spring guide 40 is a cylindrical member that accommodates the spring 36 therein. One end 40a of the spring guide 40 is inserted into an insertion hole 31g formed in the outer peripheral wall 31f of the cylinder 31 and fixed to the cylinder 31. More specifically, one end 40a of the spring guide 40 is inserted into the outer peripheral insertion hole 31g2 of the insertion hole 31g and fixed to the cylinder 31. Spring guides 40 are fixed to the plurality of cylinders 31 of the upper cylinder 31A and the lower cylinder 31B, respectively. The end face of the end 40a of the spring guide 40 is arranged to face the step surface of the outer peripheral insertion hole 31g2 and the inner peripheral insertion hole 31g1 of the insertion hole 31 g. The spring guide 40 is press-fitted into and fixed to the outer peripheral side insertion hole 31g2 of the cylinder 31, for example. More specifically, for example, the seal pipe 31h is press-fitted into the outer peripheral side insertion hole 31g2 of the cylinder 31. The sealing tube 31h is a cylindrical tube. In a state before the sealing tube 31h is press-fitted into the outer peripheral side insertion hole 31g2, the outer diameter of the sealing tube 31h is larger than the inner diameter of the outer peripheral side insertion hole 31g 2. In addition, the end 40a of the spring guide 40 is pressed into the seal tube 31 h. In a state before the spring guide 40 is pressed into the seal tube 31h, the outer diameter of the spring guide 40 is larger than the inner diameter of the seal tube 31 h. When the spring guide 40 is fixed to the cylinder 31, the hollow portion 40e of the spring guide 40 communicates with the inner peripheral side insertion hole 31g1 formed in the insertion hole 31g of the cylinder 31. At this time, the inner diameter of the hollow portion 40e preferably matches the inner diameter of the inner peripheral insertion hole 31g 1. The spring guide 40 has a bottom cover 40c disposed at the other end 40b, and the opening of the hollow portion 40e on the end 40b side is closed by the bottom cover 40 c. The spring guide 40 is accommodated in the protrusion container 50.

The spring guide 40 has an inner wall along the outer diameter of the coil of the spring 36. The spring guide 40 may have an inner wall having a circular cross-sectional shape if the spring 36 is a cylindrical coil spring, or may have an inner wall having an elliptical cross-sectional shape if the spring 36 is an elliptical coil spring, for example. The spring guide 40 restricts the radial movement of the spring 36 so that the shaft of the spring 36 does not deflect much. Since the spring guide 40 restricts the radial movement of the spring 36, the inner diameter of the spring guide 40 is preferably formed to be slightly larger than the coil outer diameter of the spring 36. That is, the inner wall of the spring guide 40 is preferably spaced apart from the coil outer diameter of the spring 36 by a small distance. Twisting can be prevented by the spring 36 being guided by the inner wall of the spring guide 40 when it expands and contracts.

Since the vane 35 disposed in the vane groove 31e slides along the inner wall of the cylinder 31, the more the number of members holding the spring 36 with respect to the cylinder 31 increases, the more difficult it is to ensure the positional accuracy between the spring 36 and the vane 35. By directly fixing the spring guide 40 to the cylinder 31, only the spring guide 40 is a member for holding the spring 36 with respect to the cylinder 31, and the positional accuracy between the spring 36 and the vane 35 can be ensured.

As shown in fig. 1, a through hole having a diameter at least as large as the outer diameter of the spring guide 40 is formed in the middle container 10a of the closed casing 10 so that the spring guide 40 can be joined to the upper cylinder 31A. Similarly, a through hole having a diameter at least as large as the outer diameter of the spring guide 40 is formed in the middle container 10a of the closed container 10 so that the spring guide 40 and the lower cylinder 31B can be joined. Alternatively, 1 through-hole may be formed in the middle container 10a of the closed container 10 so that the spring guide 40 can be joined to the upper cylinder 31A and so that the spring guide 40 can be joined to the lower cylinder 31B.

As shown in fig. 1 and 2, the hermetic compressor 100 includes a protruding container 50, and the protruding container 50 protrudes from the hermetic container 10, forms a hermetic space together with the hermetic container 10 by being joined to the hermetic container 10, and houses the spring guide 40 therein. The protruding container 50 has a cylindrical portion 51 and a protruding container lid 52. The cylindrical portion 51 is a member formed in a cylindrical shape in which the spring guide 40 is accommodated in the hollow portion 50 e. One end 50a of the cylindrical portion 51 of the protrusion container 50 is fixed to the middle container 10a of the closed container 10. Further, the cylindrical portion 51 of the protruding container 50 has a protruding container lid 52 disposed at the other end 50 b. The protruding container lid 52 closes an end portion 50b of the cylindrical portion 51 on the opposite side to the side fixed to the closed container 10. The cylindrical portion 51 closes the opening of the hollow portion 50e on the end portion 50b side by the protruding container lid 52.

As shown in fig. 1, the protrusion container 50 accommodates the spring guide 40 fixed to the lower cylinder 31B and the spring guide 40 fixed to the upper cylinder 31A in the hollow portion 50e of the cylindrical portion 51. That is, the protrusion container 50 accommodates the spring guide 40 fixed to the upper cylinder 31A and the plurality of spring guides 40 fixed to the spring guide 40 of the lower cylinder 31B in 1 protrusion container 50. The protruding container 50 has an enclosed space defined by the cylindrical portion 51, the protruding container lid 52, the cylinder 31, and the spring guide 40. Alternatively, the projecting container 50 has a sealed space defined by the cylindrical portion 51, the projecting container cover 52, the cylinder 31, the spring guide 40, and the intermediate container 10 a.

Fig. 3 is a flowchart showing a manufacturing process of the hermetic compressor 100 of fig. 1. The protruding container 50 is preferably attached to the closed casing 10 in the following order. When the step of attaching the protrusion container 50 to the closed container 10 is started, a joining step of joining the cylindrical portion 51 formed in a cylindrical shape and protruding from the closed container 10 to the middle container 10a of the closed container 10 constituting the outer shell is performed (step S1). Next, a cylinder fixing step of fixing the hollow cylinder 31 accommodating the rolling piston 33 to the middle container 10a of the closed container 10 is performed (step S2). Next, a vane disposing step of disposing the vanes 35 in the vane grooves 31e formed in the cylinder 31 is performed (step S3). Next, a spring guide fixing step of inserting and fixing the cylindrical spring guide 40 into the cylinder 31 from the hollow portion 50e of the cylindrical portion 51 is performed, the spring guide 40 defining the expansion and contraction direction of the spring 36 that biases the vane 35 toward the arrangement side of the rolling piston 33 (step S4). Next, a spring mounting step of inserting the spring 36 into the spring guide 40, bringing one end of the spring 36 into contact with the blade 35, and fixing the other end to the bottom cover portion 40c of the spring guide 40 is performed (step S5). Finally, a closing step of sealing the inside of the cylindrical portion 51 by joining the end portion 50b of the cylindrical portion 51 located on the opposite side to the side fixed to the closed container 10 and the protruding container lid 52 is performed (step S6). After the process of steps S1 to S6, the process of attaching the protruding container 50 to the closed casing 10 is completed. By attaching the protrusion container 50 to the closed container 10 as described above, the protrusion container 50 can be sealed by preventing thermal deformation of the spring guide 40 and the spring 36.

In the joining step (step S1), the cylindrical portion 51 of the protruding container 50 and the intermediate container 10a of the closed container 10 can be joined by resistance welding by making the protruding container 50 an iron member. In the plugging step (step S6), for example, the cylindrical portion 51 made of an iron member and the protruding container lid 52 made of an iron member are joined by resistance welding. Alternatively, in the plugging step (step S6), the protruding container lid 52 and the cylindrical portion 51 are joined by brazing by, for example, making the protruding container lid 52 a copper member or a copper-plated iron member. The brazing is performed by a bonding method with low heat input such as high-frequency brazing.

Fig. 4 is a schematic cross-sectional view of a modification of the protruding container 50 shown in fig. 2. As shown in fig. 4, the cylindrical portion 51 can be configured to be divided into two parts, a front cylindrical portion 51a and a rear cylindrical portion 51 b. The front cylindrical portion 51a and the rear cylindrical portion 51b are cylindrical members that house the spring guide 40 in the hollow portion 50 e. The front cylindrical portion 51a of the protruding container 50 has one end 50a fixed to the middle container 10a of the closed container 10, and the other end 50c is fitted and connected with the end 50d of the rear cylindrical portion 51 b. The front cylindrical portion 51a is formed in a tapered shape in which the wall thickness of the peripheral wall is reduced toward the end portion 50 a. One end 50b of the rear cylindrical portion 51b of the protruding container 50 is fitted and connected to an end 50c of the front cylindrical portion 51a, and a protruding container lid 52 is disposed at the other end 50 b. The rear cylindrical portion 51b of the projected container 50 is closed by the projected container lid 52 against the opening of the hollow portion 50e on the end 50b side.

In the joining step (step S1), the front cylindrical portion 51a of the protruding container 50 and the intermediate container 10a of the closed container 10 can be joined by resistance welding by making the front cylindrical portion 51a an iron member. In the plugging step (step S6), the rear cylindrical portion 51b of the protruding container 50 and the protruding container lid 52 can be joined by brazing by making the rear cylindrical portion 51b and the protruding container lid 52 of copper. As a method of brazing for joining the rear cylindrical portion 51b and the protruding container lid 52, for example, high-frequency brazing, gas brazing, or the like is available. The front cylindrical portion 51a and the rear cylindrical portion 51b can be joined by, for example, furnace brazing or the like by making the front cylindrical portion 51a an iron member and making the rear cylindrical portion 51b a copper member. Further, by making either one or both of the rear cylindrical portion 51b and the protruding container lid 52 an iron member and applying a copper plating process to the iron member, the strength of the protruding container 50 can be improved as compared with the case where both of the rear cylindrical portion 51b and the protruding container lid 52 are made of copper. In addition, when both the rear cylindrical portion 51b and the protruding container lid 52 are made of iron, the rear cylindrical portion 51b and the protruding container lid 52 can be joined by resistance welding.

[ operation of hermetic compressor 100]

Next, the operation of the sealed compressor 100 will be described with reference to fig. 1 and 2. In the hermetic compressor 100, when the rotary shaft 32 is rotated by the driving of the electric mechanism section 20, the rolling piston 33 in the cylinder 31 also rotates together with the rotary shaft 32. The rolling piston 33 eccentrically rotates, and the vane 35 slidably contacting the rolling piston 33 performs piston motion by rotation of the rolling piston 33. At this time, the gas refrigerant enters from the suction port 34 of the compression mechanism portion 30 into the cylinder chamber 31d surrounded by the inner peripheral wall 31b1 of the cylinder 31, the rolling piston 33, and the vane 35 via the suction pipe 11. Then, as the volume in the compression chamber 31d2 decreases with the rotation of the rolling piston 33, the gas refrigerant in the cylinder chamber 31d is gradually compressed.

In the compression step of the compression mechanism 30, the tip end 35a of the vane 35 abuts against the outer peripheral wall 33a of the rolling piston 33 by the biasing force of the spring 36. The vane 35 slides in the vane groove 31e in the radial direction of the cylinder 31 in accordance with the eccentric rotation of the rolling piston 33. At this time, the spring 36 is elastically deformed along the inner wall of the spring guide 40, and the elastic direction of the spring 36 is guided by the inner wall of the spring guide 40.

The gas refrigerant compressed in the compression chamber 31d2 is discharged into the internal space of the closed casing 10 from a discharge port (not shown) provided in the upper bearing 38. The gas refrigerant circulating in the internal space of the closed casing 10 passes through the gas holes (not shown) provided in the rotor 22 and the gap between the stator 21 and the rotor 22, reaches the upper portion of the inside of the closed casing 10, and is discharged from the discharge pipe 12 into the refrigerant circuit outside the closed casing 10.

As described above, the hermetic compressor 100 includes the tubular spring guide 40, and the spring guide 40 protrudes from the hermetic container 10 to form the hollow portion 40e for accommodating the spring 36, and defines the expansion and contraction direction of the spring 36. The spring guide 40 has one end 40a fixed to the cylinder 31, a hollow portion 40e communicating with an insertion hole 31g of the spring 36 formed in the cylinder 31, and the other end 40b closed by a bottom cover portion 40 c. The spring 36 is disposed between the rear end 35b of the vane 35 located on the opposite side of the rolling piston 33 and the bottom cover 40c of the spring guide 40 protruding from the closed casing 10. Since the spring 36 of the hermetic compressor 100 is disposed between the rear-side end 35b of the vane 35 and the bottom cover 40c of the spring guide 40 protruding from the hermetic container 10, the amount of expansion and contraction can be secured as compared with the case where the spring 36 is disposed between the rear-side end 35b and the hermetic container 10. In the hermetic compressor 100, the spring guide 40 is directly fixed to the cylinder 31, so that the only holding member between the cylinder 31 and the spring 36 is the spring guide 40, and the positional accuracy between the spring 36 and the vane 35 can be ensured.

The hermetic compressor 100 includes a plurality of cylinders 31, a plurality of spring guides 40 are fixed to each of the plurality of cylinders 31, and the protrusion container 50 accommodates the plurality of spring guides 40. Since the protrusion container 50 houses the plurality of spring guides 40, the joining step (step S1) may be performed 1 time, and the manufacturing process of the hermetic compressor 100 can be simplified as compared with a case where the joining step is provided for each spring guide 40.

In addition, the protruding container 50 has: a cylindrical portion 51 formed in a cylindrical shape and fixed to the closed casing 10; and a protruding container lid 52 for closing an end 50b of the cylindrical portion 51 on the opposite side to the side fixed to the closed container 10. The spring guide 40 and the spring 36 are attached from the cylindrical portion 51 fixed to the closed vessel 10, and then the cylindrical portion 51 is closed by the protruding vessel cover 52, so that the protruding vessel 50 can be closed by preventing thermal deformation of the spring guide 40 and the spring 36.

Further, the cylindrical portion 51 has: a front cylindrical portion 51a fixed to the closed container; and a rear cylindrical portion 51b fitted to the front cylindrical portion 51a and disposed to project the container lid 52. Since the cylindrical portion 51 is divided so that the axial wall length is shortened, the worker can easily perform the work in each of the joining step (step S1), the cylinder fixing step (step S2), the spring guide fixing step (step S4), and the spring attaching step (step S5).

The method of manufacturing the hermetic compressor 100 includes a joining step (step S1), a cylinder fixing step (step S2), a vane disposing step (step S3), a spring guide fixing step (step S4), a spring mounting step (step S5), and a sealing step (step S6). By attaching the protrusion container 50 to the closed container 10 as described above, the worker can seal the protrusion container 50 by preventing thermal deformation of the spring guide 40 and the spring 36.

In the method of manufacturing the hermetic compressor 100, in the sealing step (step S6), the cylindrical portion 51 made of an iron member and the protruding container lid 52 made of an iron member are joined by resistance welding. Alternatively, in the plugging step (step S6), the cylindrical portion 51 and the protruding container lid 52 are joined by brazing. The cylindrical portion 51 and the protruding container lid 52 are joined by a joining method with low heat input, so that the protruding container 50 can be sealed by preventing thermal deformation of the spring guide 40 and the spring 36.

Embodiment 2.

Fig. 5 is a vertical sectional view of a sealed compressor 110 according to embodiment 2 of the present invention. Parts having the same configuration as those of the hermetic compressor 100 shown in fig. 1 to 4 are given the same reference numerals, and the description thereof is omitted. Items not particularly described in the sealed compressor 110 according to embodiment 2 are the same as those of the sealed compressor 100 according to embodiment 1 of the present invention, and the same functions and structures are described using the same reference numerals.

In the hermetic compressor 100 according to embodiment 1, the number of the projecting vessels 50 fixed to the intermediate vessel 10a is always 1 regardless of the number of the cylinders 31 arranged in the hermetic vessel 10. In contrast, in the hermetic compressor 110 according to embodiment 2, the number of the projected vessels 50 fixed to the intermediate vessel 10a varies depending on the number of the cylinders 31 disposed in the hermetic vessel 10. That is, the hermetic compressor 110 has a plurality of the protrusion containers 50 as many as the plurality of cylinders 31. Further, the plurality of protrusion containers 50 respectively house 1 spring guide 40. For example, as shown in fig. 5, in the hermetic compressor 110 according to embodiment 2, when the number of cylinders 31 disposed in the hermetic container 10 is 2, that is, the upper cylinder 31A and the lower cylinder 31B, the number of the projected containers 50 fixed to the intermediate container 10a is also 2. In the 2 projected containers 50, the spring guide 40 fixed to the upper cylinder 31A is housed in one projected container 50, and the spring guide 40 fixed to the lower cylinder 31B is housed in the other projected container 50.

As described above, the hermetic compressor 110 includes the plurality of cylinders 31, and the plurality of spring guides 40 are fixed to the plurality of cylinders 31, respectively. The hermetic compressor 110 includes the plurality of projecting containers 50 as many as the plurality of cylinders 31, and each of the plurality of projecting containers 50 accommodates 1 spring guide 40. By storing 1 spring guide 40 in each of the plurality of projecting containers 50, a sealed space can be formed for each spring 36 even if the fixing positions of the cylinders 31 of the plurality of spring guides 40 are different in the circumferential direction.

The embodiments of the present invention are not limited to the above-described embodiments 1 to 2, and various modifications can be made. For example, the description has been given of the two-rotary compressor in which the cylinders 31 are 2 in the sealed compressor 100 and the sealed compressor 110, but the sealed compressor 100 and the sealed compressor 110 may be a single-rotary compressor having 1 cylinder 31. The cross-sectional shape of the insertion hole 31g of the hermetic compressor 100 is formed in a circular shape, but the insertion hole 31g may be formed in an elliptical shape, an oblong shape, or a polygonal shape, for example. In this case, the cross-sectional shape of the spring guide 40 formed in a cylindrical shape is formed in an elliptical shape, an oblong shape, or a polygonal shape in accordance with the cross-sectional shape of the insertion hole 31 g.

Description of reference numerals:

10 … sealing the container; 10a … middle container; 10b … upper container; 10c … lower container; 11 … suction tube; 11a … suction tube; 11B … suction tube; 12 … discharge pipe; 13 … an energy storage; 14 … stand-off; 20 … electric mechanism part; 21 … stator; 22 … rotor; 30 … compression mechanism part; 31 … cylinders; 31a … upper cylinder; 31B … lower cylinder; 31b … peripheral wall portion; 31b1 … inner circumferential wall; 31d … cylinder chamber; 31d1 … suction chamber; 31d2 … compression chamber; 31e … vane slot; 31f … outer peripheral wall; 31g … is inserted into the hole; 31g1 … inner peripheral side insertion hole; 31g2 … outer circumference side insertion hole; 31h … sealed tube; 32 … rotating the shaft; 32a … eccentric portion; 33 … rolling piston; 33a … outer peripheral wall; 34 … suction port; 34B … outlet orifice; 35 … blade; 35a … front end; 35b … back side end; 36 … spring; 36a … end; 36b … end; 37 … a divider plate; 38 … upper bearing; 39 … lower bearing; 40 … spring guide; 40a … end; 40b … end; 40c … bottom cover portion; 40e … hollow; 50 … protruding out of the container; 50a … end; 50b … end; 50c … end; 50d … end; 50e … hollow; 51 … cylindrical part; 51a … front cylindrical part; 51b … rear cylindrical part; 52 … protruding from the container lid; 100 … hermetic compressor; 110 … sealed compressor.

Claims

1. A hermetic compressor is characterized by comprising:

a closed container;

a hollow cylinder housed in the closed container;

a rolling piston eccentrically rotating along an inner circumferential wall of the cylinder;

vanes which are in contact with the outer peripheral wall of the rolling piston and divide the space in the cylinder into a suction chamber and a compression chamber;

a spring that urges the vane toward a side where the rolling piston is disposed;

a cylindrical spring guide protruding from the closed casing, forming a hollow portion for accommodating the spring, and defining a direction of expansion and contraction of the spring; and

a protrusion container protruding from the hermetic container, forming a hermetic space together with the hermetic container, and accommodating the spring guide therein,

an insertion hole into which the spring is inserted is formed in the cylinder,

one end of the spring guide is fixed to the cylinder, the hollow portion communicates with the insertion hole, and the other end is closed by a bottom cover,

the spring is disposed between the bottom cover portion and a back-surface-side end portion of the vane located on the opposite side of the rolling piston.

2. A hermetic compressor, as in claim 1,

the hermetic compressor has a plurality of the cylinder blocks,

a plurality of spring guides are fixed to the plurality of cylinders,

the protrusion container receives a plurality of the spring guides.

3. A hermetic compressor, as in claim 1,

the hermetic compressor has a plurality of the cylinder blocks,

a plurality of spring guides are fixed to the plurality of cylinders,

the hermetic compressor has a plurality of the protruded containers in the same number as the number of the plurality of cylinder blocks,

the plurality of projection containers receive 1 of the spring guides, respectively.

4. A hermetic compressor as claimed in any one of claims 1 to 3,

the protruding container has:

a cylindrical portion formed in a cylindrical shape and fixed to the sealed container; and

and a protruding container lid that closes an end portion of the cylindrical portion on the opposite side to the side fixed to the closed container.

5. A hermetic compressor, as in claim 4,

the cylindrical portion has:

a front cylindrical portion fixed to the sealed container; and

and a rear cylindrical portion fitted to the front cylindrical portion, and in which the protruding container lid is disposed.

6. A method for manufacturing a hermetic compressor, comprising:

a joining step of joining a cylindrical portion, which is formed in a cylindrical shape and protrudes from the sealed container, to the sealed container constituting an outer shell;

a cylinder fixing step of fixing a hollow cylinder housing a rolling piston in the closed container;

a vane disposing step of disposing vanes in vane grooves formed in the cylinder;

a spring guide fixing step of inserting a cylindrical spring guide, which defines a direction in which a spring that biases the vane toward a side where the rolling piston is disposed, into the cylinder from a hollow portion of the cylindrical portion and fixing the spring guide to the cylinder;

a spring mounting step of inserting the spring into the spring guide, bringing one end of the spring into contact with the blade, and fixing the other end of the spring to the spring guide; and

and a sealing step of sealing the inside of the cylindrical portion by joining an end portion of the cylindrical portion located on the opposite side to the side fixed to the sealed container and a protruding container lid.

7. A hermetic compressor as claimed in claim 6, wherein,

in the plugging step, the cylindrical portion made of an iron member and the protruding container lid made of an iron member are joined by resistance welding.

8. A hermetic compressor as claimed in claim 6, wherein,

in the sealing step, the cylindrical portion and the protruding container lid are joined by brazing.