WO2003083308A1

WO2003083308A1 - Rotary compressor

Info

Publication number: WO2003083308A1
Application number: PCT/JP2003/002282
Authority: WO
Inventors: Kazuhiko Matsukawa; Masanori Yanagisawa; Hiroshi Kitaura
Original assignee: Daikin Industries,Ltd.
Priority date: 2002-03-29
Filing date: 2003-02-27
Publication date: 2003-10-09
Also published as: JP2003293975A; BR0301921A; CN1509379A; TW200402508A; MY128662A; EP1496262A4; BR0301921B1; ES2553984T3; KR100549613B1; JP3788380B2; EP1496262A1; KR20040004680A; CN1274961C; AU2003211203A1; EP1496262B1; TW593892B; AU2003211203B2

Abstract

A rotary compressor, wherein a peripheral groove (42) allowing the contraction of a casing (10) at a welded position between the shell part (11) and the end plate (12) of the casing (10) is provided in the outer peripheral surface (40) of a partition member (23) fixed to the casing (10) so as to divide the inside of the casing (10) into a high-pressure space and a low-pressure space so that the partition member (23) can be tightened strongly by utilizing the contraction thereof, whereby a sealability between the high-pressure space and the low-pressure space in the casing (10) can be increased, and the lowering of workability at the time of assembly and an increase in cost can also be prevented.

Description

Itoda »Technical Field of Rotary Compressor

The present invention relates to a rotary compressor, and more particularly to a seal structure between a high-pressure space and a low-pressure space in a casing. Background art

Conventionally, a rotary compressor provided with various types of compression mechanisms such as a scroll type, a swing type, and a rolling piston type (rotary type) has been disclosed in, for example, Japanese Patent Application Laid-Open No. 2000-97183. It is used for compressing refrigerant gas in a refrigeration system that performs a refrigeration cycle, such as an air conditioner, as described in US Pat. The rotary compressor has a built-in compressor motor, and this compressor motor is used as a drive source to drive the above-described compression mechanisms.

Here, a schematic structure of a conventional rotary compressor will be described using a scroll compressor (100) shown in FIG. 10 as an example.

The scroll compressor (100) includes a casing (101), a compressor motor (102), and a compression mechanism (103). The casing (101) includes a cylindrical body (104) and end plates (105, 10S) fixed to upper and lower ends by welding. The compressor motor (102) includes a stator (107) fixed to a body (104), and a rotor (108) disposed on the inner peripheral side of the stator (107). The rotor (108) has a drive shaft ( 109) are linked.

The compression mechanism (103) has a fixed scroll, a movable scroll, and a housing (not shown), and the housing is fixed to the casing (the fixed scroll may be fixed to the casing). The drive shaft (109) projects above and below the stator (107) and the rotor (108). The upper end of the drive shaft (109) is connected to the orbiting scroll, and the lower end of the drive shaft (109) is connected to a bearing member (110). Supported by the casing (101). Then, the compression mechanism (103) controls the movement of the movable scroll with the rotation of the drive shaft (109). The operation of sucking, compressing, and discharging refrigerant gas is performed by changing the volume of the compression chamber depending on the operation.

The scroll compressor (100) is constructed by fitting a housing of a compression mechanism to a casing (101) at an outer peripheral portion thereof as described in, for example, Japanese Patent Application Laid-Open No. H11-226661. Separate spaces are defined above and below the compression mechanism (103). In the illustrated example, the lower space is a high-pressure space, and the upper space is a low-pressure space. Both spaces are sealed by a joint (111) between the casing (101) and the housing. In this configuration, the housing functions as a partition member.

One solution—

In a conventional scroll compressor, the housing is generally fixed to the casing by shrink fitting. However, with a shrink-fit configuration, it is possible to obtain sufficient sealing performance, but there is a problem with workability during product assembly.

On the other hand, a structure in which the housing is fixed simply by press-fitting it into the casing may be considered.In this case, although the workability is improved as compared with the shrink fit type, the sealability is reduced and the refrigerant is transferred from the high pressure space to the low pressure space May leak. Also, if a dedicated sealing member is used to enhance the sealing property, the cost will increase.

SUMMARY OF THE INVENTION The present invention has been made in view of the above problems, and has as its object to provide a rotary compressor with workability in assembling the compressor, high pressure space and low pressure space in a casing. The purpose is to increase both the sealing properties between the two and to prevent an increase in cost. Disclosure of the invention

The present invention relates to a method for welding a body (11) of a casing (10) and a head (12) to an outer peripheral surface (40) of a partition member (23) for partitioning the inside of a casing (10) into a high-pressure space and a low-pressure space. A peripheral groove (42) is provided at a location to allow the casing (10) to shrink, and the shrinkage is used to strongly tighten the partition member (23).

Specifically, the invention according to claim 1 includes a compressor motor (30) inside the casing (10). A compression mechanism (20) driven by the compressor motor (30); and a partition member (23) for dividing the inside of the casing (10) into a high-pressure space and a low-pressure space. It is premised on a rotary compressor having a cylindrical body (11) and a head plate (12) fixed to the body (11) by welding.

The rotary compressor is configured such that the partition member (23) is press-fitted into the casing (10) at or near a welding portion between the body (11) and the end plate (12). In the outer peripheral surface (40) of (23), a circumferential groove (continuous in the circumferential direction) is formed so as to allow shrinkage of the casing (10) by welding at the welded portion of the body (11) and the end plate (12). 42) is formed.

In the case of a scroll compressor, the “partition member (23)” in this configuration may be a member to which a fixed scroll is attached, or may be the fixed scroll itself. Further, the partition member (23) may be a member that partitions the inside of the casing into a high-pressure space and a low-pressure space, even in the case of a rotary compressor or a swing compressor.

In the invention according to claim 1, the body (11) and the head plate are fitted with the partition member (23) being press-fitted into the casing (10) (the body (11) or the head plate (12)). When (12) is welded, the casing shrinks in the circumferential groove (42) of the outer peripheral surface (40) of the partition member (23) due to the welding. Therefore, even if the partition member (23) is simply press-fitted into the casing (10) before welding, the casing (10) strongly tightens the partition member (23) near the circumferential groove (42) after welding. As a result, it is possible to obtain the same sealability as that obtained by shrink fitting.

According to a second aspect of the present invention, in the rotary compressor according to the first aspect, the outer circumferential surface (40) of the partition member (23) has a circumferential direction at a position close to the circumferential groove (42). protruding portions continuous (45) (46, 47) is formed, it is characterized in that is configured to be press-fitted into the protrusion portion ^{^{(4δ) (46, 4 7}} ) force the casing (10) to.

With this configuration, the projections ( ⁴⁵ ), (46, 47) formed on the outer peripheral surface ( ⁴⁰ ) of the partition member (23) are connected to the casing (10) (the body (11) or the end plate (12)). When the body (11) and the end plate (12) are welded in a state in which the protrusions (45) and (46, 47) are pressed into the body (11) or the end plate (12) in a state in which the protrusions (45) and (46, 47) are pressed into the body. This has the same effect as increasing the cost, and improves the sealing performance. The invention according to claim 3 is characterized in that the outer peripheral surface (40) of the partition member (23) has a clearance fit with the trunk (11) or the end plate (12) of the casing (10). The peripheral groove (42) and the projections (45) (46, 47) are formed on the outer peripheral surface (40) of (23).

In other words, the present invention is configured such that the partition member (23) is loosely fitted to the casing (10) at or near the welding location of the body (11) and the end plate (12). The outer peripheral surface (40) has a circumferential groove (42) continuous in the circumferential direction so as to allow shrinkage of the casing (10) by welding at the welded portion of the body (11) and the head plate (12). protruding portions continuous to the position in the circumferential direction toward the circumferential groove (42) (45) and (4 ^6, ⁴ 7) are formed on the protrusion portion (4δ) (4 6, 47 ) 1 casing (10) It is characterized by being configured to be press-fitted.

According to the third aspect of the invention, the partition member (23) is press-fitted into the body (11) or the end plate (12) of the casing (10) only at the projections (45), (46, 47). When the body (11) and the end plate (12) are welded in this state, the casing (10) shrinks at the position of the circumferential groove (42), thereby increasing the tightening force. Therefore, even with this configuration, it is possible to obtain the same sealing performance as that obtained by shrink fitting.

According to a fourth aspect of the present invention, in the rotary compressor according to the second or third aspect, the projections (46, 47) of the partition member (23) are provided at a plurality of locations. It is a feature.

With this configuration, the projections (46, 47) that are continuous in the circumferential direction on the outer peripheral surface (40) of the partition member (23) are arranged in multiple in the axial direction of the partition member (23). The sealability is improved by increasing the number of press-fitting points of the projections (46, 47) to the part (11) or the end plate (12).

According to a fifth aspect of the present invention, in the rotary compressor according to the fourth aspect, a plurality of projections (46, 47) have different projection heights from each other. With this configuration, for example, the protrusion height of the projections (46, 47) on the front side in the press-in direction of the partition member (23) with respect to the body (11) or the end plate (12) is reduced, and The projection height of the projections (46, 47) can be increased. By doing so, the partition member (23) can be relatively easily press-fitted into the casing (10), and the sealing performance does not deteriorate. According to a sixth aspect of the present invention, in the rotary compressor according to the second or third aspect, one or both ends in the axial direction of the partition member (23) at the projections (45) (46, 47). (45a, 45b) is formed on the tapered surface.

According to the invention of claim 6, of the end portions of the projections (45), (46, 47), the front side of the partition member (23) in the press-fitting direction with respect to the trunk (11) or the end plate (12) is tapered. When formed on the surface (45a), the partition member (23) can be easily pressed into the casing (10). Further, if the rear side in the press-fitting direction is formed on the tapered surface (45b) of the ends of the protruding portions (45) (46, 47), the welding portion between the body (11) and the end plate (12) is formed. In this case, when the casing (10) contracts along the tapered surface (45b), the contracted portion is easily pressed against the tapered surface (45b). Therefore, if the casing (10) and the projections (45) (46, 47) are not pressed sufficiently, the sealability may be reduced, while a sufficient pressure contact surface is obtained. As a result, the sealing performance is improved.

According to a seventh aspect of the present invention, in the rotary compressor according to the second or third aspect, the partition member (23) has a thick portion (43) and a thin portion (43) having radially different thicknesses. 44), and the projections (45) (46, 47) are formed on the outer periphery of the thick portion (43). In this configuration, the thick part (43) is a part whose diameter dimension is entirely thick, and the thin part (44) is a part including a thin part in at least a part of the whole.

When the projections (45), (46, 47) are formed on the outer periphery of the thick portion (43) of the partition member (23), the casing (10) shrinks due to welding to strengthen the partition member (2 ³ ). In contrast to the tightening, the rigidity of the thick portion (43) can withstand the tightening force. For this reason, it is possible to prevent the partition member (23) from being deformed.

According to an eighth aspect of the present invention, in the rotary compressor according to any one of the first to third aspects, the end plate ² ) of the casing (10) is provided with the body (11) or the partition member (23). , While being axially abutted against the main body (11), while being loosely fitted to the body (11) or the partition member (23).

With this configuration, the end plate (12) and the body (11) are welded while easily positioning the end plate (12) with respect to the goose (10) in the axial direction thereof. 3) is easily and securely fixed to the casing (10). According to a ninth aspect of the present invention, in the rotary compressor according to any one of the first to third aspects, the compression mechanism (20) is constituted by a scroll-type compression mechanism (20), and the partition member ( 23) is a member to which the fixed scroll (21) is fixed.

On the other hand, when the fixed scroll (21) itself is fixed as a partition member (23) to the casing (10) by shrink fitting in the scroll compressor, the relationship between the strength of the fixed scroll (21) and the tightening force is reduced. In some cases, it is conceivable that the fixed scroll (21) is deformed and the performance of the compressor is degraded, but in the present invention, the partitioning member (23) separate from the fixed scroll (21) is packaged (10). ), So that no tightening force acts on the spiral portion of the fixed scroll (21), and the performance of the compressor does not deteriorate.

One effect one

According to the first aspect of the present invention, the circumferential groove (42) is formed on the outer peripheral surface (40) of the partition member (23) fitted to the trunk (11) or the end plate (12) of the casing (10). Since the casing (10) can be contracted by welding at the welding portion between the body (11) and the end plate (12), the partition member (23) can be strongly tightened by utilizing the contraction. Accordingly, the sealing performance at the joint between the casing (10) and the partition member (23) can be improved. Therefore, even if the partition member (23) is simply press-fitted into the casing (10), it is possible to obtain the same sealing performance as after shrink fitting after welding. Furthermore, since shrink fitting is not actually required, workability during assembly is excellent. In a configuration in which the partition member (23) is shrink-fitted to the body (11) and then the body (11) and the end plate (12) are welded, parts may be distorted due to repeated heating. In the present invention, since the heating is performed once, there is little possibility that the parts are distorted.

Further, in the conventional compressor, an O-ring or the like may be used in order to enhance the sealing performance.In such a case, the cost is increased.However, the above configuration does not require a dedicated sealing member such as the O-ring. There will be no cost increase due to an increase in the number of parts.

Further, according to the invention described in claim 2, the outer peripheral surface of the partition member ⁽²³⁾ ⁽⁴ 0), the protrusion proximate the circumferential groove ⁽⁴ 2) (45) (46, 47) is formed, Insert these projections (45) (46, 47) Since the body (11) or the end plate (12) of the bush (10) is press-fitted, the sealing effect is further enhanced by the effect of the above-mentioned shrinkage of the body (11).

According to the third aspect of the present invention, the outer peripheral surface (40) of the partition member (23) has a clearance fit with the body (11) or the end plate (12) of the casing (10). A circumferential groove (42) and projections (45) (46, 47) are formed on the outer peripheral surface (40) of the partition member (23). For this reason, only the protrusions (45) (46, 47) need be press-fitted into the casing (10), so that the assembling work is easy. Further, since the casing (10) strongly tightens only the protrusions (45) (46, 47), it is possible to prevent a strong tightening force from acting on the entire partition member (23). Therefore, deformation of the partition member (23) can be prevented. Further, as in the first and second aspects of the present invention, the sealing performance is improved, and the cost is not increased due to an increase in the number of parts.

According to the invention as set forth in claim 4, the circumferentially continuous projections (46, 47) are provided at a plurality of locations on the outer peripheral surface (40) of the partition member (23), and a multiple sealing effect is provided in the axial direction. , So that the sealing performance is further improved.

According to the fifth aspect of the present invention, since the protrusion heights of the plurality of projections (46, 47) are different from each other, for example, the partition member (23) with respect to the casing (10) can be mounted. When the protrusion height of the protrusions (46, 47) on the front side in the press-fitting direction is reduced and the protrusion height of the protrusions (46, 47) on the rear side in the press-fitting direction is increased, the partition member with respect to the casing (10) is reduced. (23) can be fitted relatively easily. That is, workability can be further improved without lowering the sealing performance.

According to the invention of claim 6, since one end or both ends (45a, 45b) of the protrusions (45), (46, 47) in the axial direction are tapered, the protrusions (45, 45) are tapered. ) Of the ends of (46, 47), a tapered surface (45a) is formed on the front side of the partition member (23) in the press-fitting direction with respect to the casing (10), thereby facilitating insertion and improving workability. Conversely, when the tapered surface (45b) is located on the rear side in the press-fitting direction of the ends of the protrusions (45) (46, 47), the body (11) comes into pressure contact with the tapered surface. Appropriate sealing properties can be obtained.

According to the seventh aspect of the present invention, when the partition member (23) has a thick portion (43) and a thin portion (44) having different radial thicknesses, the protrusion (45) ( 46, 47) are formed on the outer periphery of the thick part (43) with high rigidity, so that the body (11) shrinks due to welding. Also, the deformation of the partition member (23) can be prevented. Therefore, for example, even when the fixed scroll (21) is fixed to the casing (10) as a partition member in the scroll compressor, it is possible to prevent the performance of the compressor from deteriorating due to the deformation of the fixed scroll (21).

According to the invention described in claim 8, the end plate (12) of the casing (10) abuts on the body (11) or the partition member (23) of the compression mechanism (20) in the axial direction, The body (11) or the partition member (23) is configured to be clearance-fitted. Therefore, the partition plate (23) is securely fixed to the casing (10) by welding the mirror plate (12) and the body (11) while easily positioning the mirror plate (12) with respect to the casing (10). Workability is improved.

According to the ninth aspect of the present invention, in the scroll compressor, a member to which the fixed scroll is fixed is a partition member (23), and shrinkage due to welding of the body (11) and the end plate (12) is used. Then, the partition member (23) is tightened. Therefore, since the fastening force does not directly act on the fixed scroll, it is possible to reliably prevent the performance from being deteriorated due to the leakage loss due to the deformation of the spiral. In order to suppress the leakage loss in the conventional structure, it is conceivable to provide an elastic member between the fixed scroll and the casing (10) to absorb the deformation of the partition member (23). However, according to the present invention, such a problem does not occur. BRIEF DESCRIPTION OF THE FIGURES

FIG. 1 is a sectional structural view of a scroll compressor according to Embodiment 1 of the present invention. FIG. 2 is a partially enlarged view of the scroll compressor of FIG. 1 and shows a seal structure between a high-pressure space and a low-pressure space in a casing.

FIG. 3 is an enlarged view of the protrusion of the housing.

FIG. 4 is a view showing a modified example of a welded portion between the body of the casing and the head plate.

FIG. 5 is a view showing a first modification of the projection.

FIG. 6 is a view showing a second modification of the projection.

FIG. 7 is a view showing a third modification of the projection.

FIG. 8 is a view showing a fourth modification of the projection. FIG. 9 is a partially enlarged view showing the seal structure of the scroll compressor according to the second embodiment.

FIG. 10 is a sectional structural view of a conventional scroll compressor. BEST MODE FOR CARRYING OUT THE INVENTION

[Embodiment 1]

Hereinafter, Embodiment 1 of the present invention will be described in detail with reference to the drawings.

This embodiment relates to a scroll compressor. First, the overall configuration of the scroll compressor will be described with reference to FIG.

This scroll type compressor (1) compresses low-pressure refrigerant sucked from an evaporator side and discharges it to a condenser side in a refrigerant circuit for performing a vapor compression type refrigeration starter such as an air conditioner. Used for As shown in FIG. 1, the scroll compressor (1) includes a compression mechanism (20) and a compressor motor (30) as a drive mechanism for driving the compression mechanism (20) inside a casing (10). ). Further, the compression mechanism (20) is disposed at an upper portion in the casing (10), and the compressor motor (30) is disposed at a position slightly lower than a central portion in the casing (10). The casing (10) is provided with a connector terminal (35) for supplying power to the compressor motor (30).

The casing (10) is composed of a cylindrical body (11), and dish-shaped end plates (12, 13) fixed to the upper and lower ends of the body (11) or at the vicinity thereof by welding, respectively. Have been. The casing (10) is provided with a suction pipe (14) penetrating the upper end plate (12). At a position slightly higher than the center of the body (11), a discharge pipe (15) penetrating the body (11) is provided so as to communicate with the inside and outside of the casing (10). Further, a predetermined amount of lubricating oil (refrigeration oil) is stored in a lower portion of the casing (10) (not shown).

The compressor motor (30) includes a stator (31) fixed to a body (11) of a casing (10), and a rotor (32) disposed inside the stator (31). A drive shaft (33) is fixed to a rotor (32) of the motor (30). The drive shaft (33) projects vertically with respect to the stator (31) and the rotor (32) of the compressor motor (30). The drive shaft (33) has an upper end connected to the compression mechanism (20), and a lower end connected to a cable. It is rotatably supported by a bearing member (34) fixed to the lower end of the trunk (11) of the shing (10).

On the other hand, the compression mechanism (20) includes a fixed scroll (21), a movable scroll (22), and a housing (23). The fixed scroll (21) is composed of a head plate (21a) and a spiral (involute) wrap (21b) formed on the lower surface of the head plate (21a). The orbiting scroll (22) is composed of a head plate (22a) and a spiral (inpolo-shaped) wrap (22b) formed on the upper surface of the head plate (22a).

The housing (23) forms a part of the compression mechanism (20), and the housing (23) is press-fitted into the casing (10) and fixed to fix the position of the compression mechanism ( ²⁰ ). You. The housing (23) is a partition member for vertically dividing the internal space of the casing (10). A low-pressure space is formed above the housing (23), and a high-pressure space is formed below the housing (23).

The fixed mouth opening (21) is fixed to the upper surface of the housing (23) by fastening means such as bolts (not shown). The movable scroll (22) is arranged between the fixed scroll (21) and the housing (23). Further, the end plate of the movable scroll ⁽² 2) and (22a) between the housing (23), as the movable scroll (23) performs revolves only with respect to the fixed scroll (2 1), Oldham coupling, etc. The rotation preventing member (24) is provided.

The wrap (21b) of the fixed scroll (21) and the wrap (22b) of the orbiting scroll (22) are combined with each other. A compression chamber (25) is formed between the end plate (21a) of the fixed scroll (21) and the end plate (22a) of the movable scroll (22) between the contact portions of the two wraps (21b, 22b). Have been. The compression chamber (25) is configured to compress the refrigerant as the volume between the two wraps (21b, 22b) shrinks toward the center as the orbit of the movable scroll (22) revolves. .

The end plate (21a) of the fixed scroll (21) has a low-pressure coolant suction port (21c) formed at the periphery of the compression chamber (25). The end plate (22a) of the movable scroll ( ²² ) has discharge port of the high-pressure refrigerant in the central portion of the compression chamber ⁽² 5) (22c) are formed. A suction pipe (14) fixed to the end plate (12) of the casing (10) is connected to the refrigerant suction port (21c). The pipe (14) is connected to an evaporator of a refrigerant circuit (not shown).

A boss (22d) to which the upper end (33a) of the drive shaft (33) is connected is formed at the center of the lower surface of the end plate (22a) of the orbiting scroll (22). The upper end (33a) of the drive shaft (33) is an eccentric shaft eccentric from the center of rotation of the drive shaft (33), and the housing (23) is located immediately below the eccentric shaft (33a). ) Is rotatably supported. It is a seal ring (26) arranged around the boss (22d) and fitted to the inner hole (23a) of the housing (23), and the high pressure introduced into the inner hole (23a). The refrigerant gas is configured not to leak to the outer peripheral side of the seal ring (26).

The drive shaft (33) is provided with a discharge path (27) for guiding the high-pressure refrigerant from the discharge port (22c) of the orbiting scroll (22) to a space below the housing (23). The lower end of the discharge path (27) is open at a position below the compressor motor (30). The high-pressure refrigerant gas flowing out of the discharge passage (27) flows from a discharge pipe (15) provided in the body (11) of the casing (10) to a condenser of the refrigerant circuit through a refrigerant pipe (not shown). Supplied.

The drive shaft (33) is provided with an oil supply pump (28) and an oil supply path (33b). The lubrication pump (28) is provided at the lower end of the drive shaft (33), and is configured to pump lubricating oil (not shown) stored in a lower portion of the casing (10) as the drive shaft (33) rotates. ing. The oil supply passage (33b) extends in the drive shaft (33) in the vertical direction, and is provided at each part so as to supply the lubricating oil pumped by the oil supply pump (28) to each sliding portion. (Not shown).

In the above configuration, when the motor (30) is driven, the rotor (32) is rotated, whereby the drive shaft (33) is rotated. When the drive shaft (33) rotates, the orbiting scroll (22) does not rotate, but only revolves with respect to the fixed scroll (21). As a result, as the volume of the compression chamber (25) changes, low-pressure refrigerant is sucked from the suction pipe (14) into the peripheral portion of the compression chamber (25), and the refrigerant is compressed. Then, it flows through the discharge path (27) and fills a space below the housing (23) in the casing (10). After the refrigerant is discharged from the discharge pipe (15), the refrigerant circuit repeats the operation of being condensed, expanded, and vaporized in the refrigerant circuit, and then sucked again from the suction pipe (14) and compressed. . As described above, the housing (23) vertically divides the internal space of the casing (10). As a feature of the first embodiment, the housing (23) itself has a sealing function between the low-pressure space above the housing (23) and the high-pressure space below. Therefore, the seal structure will be described below with reference to FIGS.

First, the housing (23) is dimensioned so that its outer peripheral surface (40) is fixed to the body (11) of the casing (10) by press-fitting in FIG. 2, which is an enlarged sectional view of the seal structure. A flange (41) projecting radially outward is formed at the upper end thereof so as to contact the upper end surface of the body (11). In addition, the outer peripheral surface (40) of the housing (23) is formed so as to allow shrinkage of the casing (10) due to the welding at the welding portion between the body (11) and the end plate (12). A circumferential groove (42) continuous in the circumferential direction is formed. The peripheral groove (42) is formed on the outer peripheral surface (40) of the housing (23) at a position immediately below the flange (41).

The housing (23) has a thick portion (43) and a thin portion (44) having different thicknesses in the radial direction. The thick portion (43) is a thick portion having a uniform diameter dimension throughout, and the thin portion (44) is a portion including a thin portion in at least a part of the whole.

An outer peripheral surface (40) of the housing (23) has a circumferentially continuous protrusion (45) formed at a position close to the lower end of the circumferential groove (42), and the protrusion (45) It is located on the outer periphery of the thick portion (43). The protrusion (45) is configured to be pressed into the body (11) of the casing (10), and as shown in an enlarged view of FIG. 3, both ends in the axial direction (upper and lower ends) (45a, 45b) are formed on the tapered surface. The tapered surface (45a) on the press-fit side (lower side) with respect to the body of the tapered surface of the projection is inclined at an angle of about 15 ° with respect to the outer peripheral surface (40) of the housing (23). ing. The opposite (upper) tapered surface (45b) is inclined at an angle of about 45 ° with respect to the outer peripheral surface (40) of the housing (23).

The upper end plate (12) of the casing (10) abuts the housing (23) in the axial direction, while being radially fitted to the body (11) and the housing (23). It is configured as follows. That is, the end plate (12) is arranged in the axial direction with respect to the body (11) and the housing (23), but is not positioned in the radial direction at this portion. . As a result, the assembling work when welding the torso (11) and the head plate (12) Can be done easily.

In the above seal structure, the housing (23) of the compression mechanism (20) is pressed into the body (11) until the flange (41) comes into contact with the upper end surface of the body (11). ) Is welded to the body (11), whereby the compression mechanism (20) is firmly positioned in the casing (10), and the high-pressure space and the low-pressure space are sealed.

That is, first, as shown in FIG. 2 (a), the housing (23) is press-fitted into the body (11) so that the outer peripheral surface (40) of the housing (23) contacts the inner peripheral surface of the body (11). After pressing and pressing the projection (45) into the inner peripheral surface of the body (11), the end plate (12) is welded to the body (11) as shown in Fig. 2 (b). Later (after cooling), the body (11) contracts at the position of the circumferential groove (42), and the body (11) strongly tightens the housing (23) at least from the circumferential groove (42) to a portion immediately below the housing (23). . As a result, an operation equivalent to an increase in the press-fit allowance of the outer peripheral surface (40) and the projection (45) of the housing (23) with respect to the body (11) occurs, and a high sealing effect is obtained. become. In this way, not only is the housing (23) pressed into the body (11) or the protrusion (45) is cut into the body (11), but also after the welding of the body (11). By utilizing the shrinkage of the seal, it is possible to improve the sealing performance to the same degree as that of the shrink-fit.

—On the other hand, in the present embodiment, although the same degree of sealing performance as that of the shrink fit is obtained, shrink fit is not actually required, and moreover, in this type of compressor (1), Since the sealing performance is enhanced by welding the torso (11) and the end plate (12), which is an indispensable operation, no additional work is required for the sealing function. The properties are very good as in the case of only press-fitting.

Further, in the configuration in which the housing (23) is shrink-fitted to the body (11) and then the body (11) and the end plate (12) are welded, parts may be distorted due to repeated heating. Since heating is performed once in the invention, there is little risk of distortion of parts.

Conventionally, a dedicated sealing member such as an O-ring is generally used as a sealing structure. However, in the first embodiment, a dedicated sealing member such as an o-ring is not required. The number of parts does not increase due to the sealing function, and the cost does not increase accordingly.

Further, of the ends of the projections (45), the front side in the press-fitting direction into the body (11) is tapered. Since it is formed on the surface (45a), the housing (23) can be easily pressed into the casing (10). In addition, since the rear side in the press-fitting direction of the end portion of the projection (45) is formed as a tapered surface (45b), the torso portion is welded to the torso portion (11) and the end plate (12). When (11) contracts along the tapered surface (45b), the contracted portion comes into pressure contact with the tapered surface (45a), and sufficient sealing properties can be obtained. In other words, if this portion is not sufficiently pressed, the sealing performance may be deteriorated. On the other hand, in this embodiment, since this portion is fully pressed, the sealing performance is improved.

In this embodiment, since the projection (45) is formed on the outer periphery of the thick part (43) of the housing (23), the housing (23) is strongly tightened by shrinkage of the casing (10) by welding. The thick portion (43) can sufficiently resist the applied force. Therefore, even if the casing (10) contracts, the housing (23) does not deform.

In this embodiment, a housing (23) to which the fixed scroll (21) is fixed is press-fitted into the body (11), and a projection (45) is formed on the outer peripheral surface (40). Since the high-pressure space and the low-pressure space are sealed by tightening (23) with the body (11), the fixed scroll (21) has a tightening force due to the contraction of the casing (10). It does not work directly. For this reason, the wrap (21b) of the fixed scroll (21) does not deform, and the performance of the compressor (1) does not deteriorate due to leakage of the refrigerant.

(Modification 1)

In the first embodiment described above, the force S configuring the casing (10) so that the end plate (12) fits in the state of a clearance fit around the body (11) and the outer periphery of the housing (23), FIG. As shown in the figure, the peripheral groove 2) of the housing (23) is welded to the end plate (12) by welding so that the end plate (12) fits on the inner peripheral side of the body (11) of the casing (10). It may be configured to be able to contract. In short, the circumferential groove (42) of the housing (23) allows the casing (10) to contract at the welding portion between the body (11) and the end plate (12), so that the casing (10) ) Can be received on either the torso (11) or the end plate (12), provided that it is configured to be strongly tightened. Even in this case, the same effects as in the first embodiment can be obtained.

(Modification 2) Modification 2 is a modification of the protrusion.

For example, in the example of FIG. 5, only the lower end (45a) of the projection (45), which is to be pressed into the body (11), is formed into a tapered surface, and the upper end (45b) Has a shape that rises at right angles from the outer peripheral surface (40) of the housing (23). In the example of FIG. 6, the upper end (45b) of the protrusion (45) in the first embodiment is a tapered surface directly connected to the circumferential groove (42). (45b) is an example in which only the portion from the outer peripheral end of the projection (45) to the outer peripheral surface (40) of the housing (23) is a tapered surface. Furthermore, in the example of FIG. 7, both the upper and lower ends (45a, 45b) of the protrusion (45) are not tapered, but are end surfaces that rise perpendicularly from the outer peripheral surface (40) of the housing (23). It is an example.

Even when the projection (45) is configured as described above, if the casing (10) contracts after welding the body (11) and the end plate (12), the casing (10) will be attached to the projection (45). , So that the sealing performance can be improved more than before, and a decrease in workability can be prevented.

In the example of FIG. 8, the projections (46, 47) are provided at a plurality of locations on the outer peripheral surface (40) of the housing (23), and the projection heights of the projections (46, 47) are different from each other. This is an example. Specifically, the protrusion height of the protrusion (46) on the press-fit side (lower side) of the housing (23) with respect to the body (11) is reduced, and the protrusion of the protrusion (47) on the rear side (upper side) is reduced. The height is increased.

In this example, the projections (46, 47) that are circumferentially continuous on the outer peripheral surface (40) of the housing (23) are arranged in multiple in the axial direction of the 1S housing (23). The sealing performance is improved by increasing the number of press-fitting points of the projections (46, 47) for the boss. Also, since the protrusion height of the protrusion (46) on the press-fit side of the housing (23) with respect to the body (11) is reduced, the housing (10) can be secured to the casing (10) while ensuring high sealing performance. 23) can be press-fitted relatively easily.

[Embodiment 2]

The first embodiment is configured such that the outer peripheral surface (40) of the housing (23) is press-fitted into the body (11), and then the outer peripheral surface (40) has the peripheral groove (42) and the projection (45). In the second embodiment, as shown in FIG. 9, the outer peripheral surface (40) of the housing (23) has a clearance between the body (11) of the casing (10). It is to be fitted. The figure is The clearance fit is exaggerated.

In the outer peripheral surface (40) of the housing (23), a circumferential groove (42) is formed in the circumferential direction so as to allow the casing (10) to contract by welding at the welded portion of the body (11) and the end plate (12). ) And a projection ( ⁴⁵ ) continuous in the circumferential direction at a position close to the circumferential groove (42), and the projection (45) is further press-fitted into the body (11) of the casing (10). This embodiment is the same as the first embodiment in that it is configured as follows. Other configurations are the same as those of the first embodiment. Thus, in a configuration in which the outer peripheral surface (40) of the housing (23) is loosely fitted to the body (11) or the end plate (12) of the casing (10), the outer peripheral surface (4 When the circumferential groove (42) and the projection (45) are formed in the (0), the housing (23) can be more easily press-fitted into the body (11), and the assembling work is facilitated.

When the body (11) and the end plate (12) are welded together with the projection (45) of the housing (23) being pressed into the body (11), the casing (10) is formed into a circumferential groove (42). By contracting at the position, the tightening force is increased. Therefore, even in this configuration, it is possible to obtain the same sealing property as that obtained by shrink fitting.

Further, in this configuration, the housing (23) is tightly fitted, so that the casing (10) strongly tightens only the protrusion (45), and strong tightening force does not act on the entire housing (23). (23) is unlikely to occur.

In the second embodiment as well, the protrusions (45) (46, 47) can be changed as shown in FIGS.

[Other embodiments]

The present invention may be configured as follows in the above embodiment.

For example, in the above embodiment, an example was described in which the housing (23) was used as a partition member. However, the fixed scroll (21) may be fixed to the casing (10) as a partition member to separate the high-pressure space from the low-pressure space. . In this case, if a projection is formed around the thick portion of the fixed scroll (21) (for example, the end plate (21a)), a strong tightening force does not act on the wrap ( ² lb). The leakage of the refrigerant due to the deformation of (21b) can be prevented, and the performance does not decrease.

In the above embodiment, an example in which the present invention is applied to the scroll compressor (1) has been described. However, the present invention is applicable to other types of compressors such as a rotary compressor and a swing compressor. It is also applicable to rotary compressors. Even in this case, a partition member for partitioning the interior of the casing (10) into a high-pressure space and a low-pressure space is press-fitted into the casing (10) at the welded portion of the body (11) and the head (12), and the casing ( It is advisable to tighten the partition member strongly using the shrinkage of 10).

Further, in the above embodiment, the example in which the protrusions (45), (46, 47) are formed on the outer peripheral surface (40) of the housing (23) which is press-fitted into the casing (10) has been described. When the surface (40) is press-fitted into the casing (10), the projections (45) (46, 47) need not necessarily be formed. That is, the housing (23) having no projection on the outer peripheral surface (40) may be press-fitted into the body (11), and the tightening force due to shrinkage after welding may be used. Even in this case, the assembling work is easy, and the casing (10) strongly tightens the outer peripheral surface of the housing (23) by shrinkage due to welding, so that the sealing performance can be improved as compared with the conventional case.

Further, in the above-described embodiment, the configuration in which the housing (23) is press-fitted into the body (11) of the casing (10) and fixed is described, but a partition member such as the housing (23) is provided with a head plate of the casing (10). It may be configured to be fixed to (12). Industrial applicability

As described above, the present invention is useful for a rotary compressor.

Claims

The scope of the claims

1. Within the casing (10), a compressor motor (30), a compression mechanism (20) driven by the compressor motor (30), and partition the interior of the casing (10) into a high-pressure space and a low-pressure space. A rotary compressor comprising a partition member (23), a casing (10) having a cylindrical body (11) and a head plate (12) fixed to the body (11) by welding. hand,

The partition member (23) is configured to be press-fitted into the casing (10) at or near a welding portion between the trunk (11) and the end plate (12),

An outer circumferential surface (40) of the partition member (23) has a circumferentially continuous circumferential portion so as to allow the casing (10) to contract by welding at a welded portion of the body portion (11) and the end plate (12). A rotary compressor characterized by having a groove (42).

2. On the outer peripheral surface (40) of the partition member (23), there are formed projections (45) (46, 47) which are continuous in the circumferential direction at a position close to the peripheral groove (42),

2. The rotary compressor according to claim 1, wherein the protrusions (45), (46, 47) are configured to be pressed into the force casing (10).

3. In the casing (10), a compressor motor (30), a compression mechanism (20) driven by the compression motor (30), and the casing (10) are partitioned into a high-pressure space and a low-pressure space. A rotary compressor comprising a partition member (23), a casing (10) having a cylindrical body (11) and a head plate (12) fixed to the body (11) by welding,

The partition member (23) is configured so as to be fitted into the casing (10) at or near the welding portion between the trunk (11) and the end plate (12),

An outer circumferential surface (40) of the partition member (23) has a circumferential groove continuous in a circumferential direction so as to allow shrinkage of the casing (10) by welding at a welded portion of the body (11) and the end plate (12). (42) and a projection (45) (46, 47) continuous in the circumferential direction at a position close to the circumferential groove (42),

The rotary compressor, wherein the protrusions (45) (46, 47) are configured to be press-fitted into the casing (10).

4. The rotary compressor according to claim 2, wherein the projections (46, 47) of the partition member (23) are provided at a plurality of locations.

5. The rotary compressor according to claim 4, wherein the protrusion heights of the plurality of protrusions are different from each other.

6. The protrusion (45) (46, 47) is characterized in that one end or both ends (45a, 45b) of the partition member (23) in the axial direction are formed in a tapered surface. Is the rotary compressor described in 3.

7. The partition member (23) has a thick portion (43) and a thin portion (44) having different thicknesses in the radial direction, and the protrusions (45) (46, 47) are provided in the thick portion (43). The rotary compressor according to claim 2, wherein the rotary compressor is formed on an outer periphery of the rotary compressor.

8. The end plate (12) of the casing (10) abuts the body (11) or the partition member (23) in the axial direction, while the body (11) or the partition member (23) is in contact with the body (11) or the partition member (23). 4. The rotary compressor according to claim 1, wherein the rotary compressor is configured to have a clearance fit.

9. The compression mechanism (20) is constituted by a scroll compression mechanism (20),

The rotary compressor according to any one of claims 1 to 3, wherein the partition member (23) is configured to fix the fixed scroll (21).