JP4875411B2 - Scroll compressor - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a scroll compressor reduced in weight, capable of solving gas leak due to pressure deformation of a housing or a scroll member without enhancing the rigidity thereof by optimizing the structure of the housing and the arrangement structure of a seal member. <P>SOLUTION: A scroll compression mechanism 23 is set within the housing 3 composed of a front housing 5 and a rear housing 7, and a fixed scroll member 25 thereof is fastened and fixed to the inner surface of the rear housing 7 by a first seal member 39 interposed between an end surface closer to the inner circumference from the outer circumference of an end plate 25A and the inner surface of the rear housing 7 through a first bolt 31 so as to define a discharge chamber 41 to which gas compressed by the scroll compression mechanism 23 is discharged on the inside of the first seal member 39. The first seal member 39 partitions the internal space of the housing 3 to the discharge chamber 41 and a suction chamber 43 formed by the space except the discharge chamber 41. <P>COPYRIGHT: (C)2008,JPO&amp;INPIT

Description

  The present invention relates to a scroll compressor applied to a refrigerant compressor of a refrigeration or air conditioner.

  A scroll compression mechanism composed of a pair of fixed scroll members and orbiting scroll members is housed and installed in a housing composed of a funnel-shaped front housing and a rear housing connected to the large-diameter opening of the front housing. In the scroll compressor, the fixed scroll member is fixedly installed on the rear housing, and a sealing material is interposed between the end plate of the fixed scroll and the housing, and the pressure inside the housing becomes low and the pressure becomes low. Patent Documents 1 and 2 propose a scroll compressor that is divided into a suction chamber side.

  Further, a scroll compression mechanism constituted by a pair of fixed scroll members and a turning scroll member is accommodated in a housing constituted by a cup-shaped rear housing and a front housing connected to the large-diameter opening of the rear housing. In the scroll compressor to be installed, stepped portions are respectively provided on the front end surface and the bottom surface of the spiral wrap of each of the fixed scroll member and the orbiting scroll member, and the wrap height is on the inner peripheral side on the outer peripheral side of the spiral wrap. A scroll compression mechanism that is higher than the wrap height and that can compress in the circumferential direction and the wrap height direction is capable of three-dimensional compression, and the fixed scroll member of the scroll compression mechanism is fixedly installed on the rear housing side. A sealing material is interposed between the end plate of the fixed scroll member and the housing, Discharge chamber side through the Ujingu a high pressure and a scroll compressor constituted by partitions into a low pressure and becomes the suction chamber side, it has been proposed by Patent Document 3 and the like.

JP 2000-108647 A JP 2000-320477 A Japanese Patent Publication No. 60-17756

However, in the scroll compressor shown in Patent Documents 1 and 2 described above, a sealing material that seals the inside of the housing in an airtight manner is disposed between the discharge chamber that is at a high pressure and the atmosphere. For this reason, when a malfunction occurs in the sealing material, or when a high pressure abnormally rises and a leak occurs, there is a problem that the high-pressure gas flows out directly to the atmosphere.
The sealing material is disposed at a position substantially the same diameter as the inner diameter of the housing or the outer diameter of the end plate of the fixed scroll member. According to such a configuration, a high pressure is applied to the entire surface of the housing and the end plate of the fixed scroll member, and the area that receives the pressure load due to the high pressure is maximized. For this reason, there is a concern about the occurrence of gas leakage due to minute deformation of the housing and the end plate due to excessive pressure load. Therefore, the thickness of the housing and the end plate must be increased to increase the rigidity, which increases the weight of the compressor and hinders weight reduction.

In addition, the scroll compressor disclosed in Patent Document 3 is configured such that the high-pressure gas in the discharge chamber does not directly flow out to the atmosphere when the housing and the sealing material are arranged as described above. However, since the sealing material is disposed on the outer periphery of the end plate of the fixed scroll member, the size of the area of the housing and the portion of the fixed scroll member end plate that receives the pressure load due to the high pressure is described in Patent Documents 1 and 2. There is no difference with anything.
Therefore, in reality, various problems such as gas leakage due to minute pressure deformation, increased rigidity of the housing and the end plate as a countermeasure, and accompanying increase in the weight of the compressor have not been solved. In particular, for a compressor applied to an air conditioner for a vehicle, weight reduction is one of the biggest problems.

  The present invention has been made in view of such circumstances, and optimizes the housing configuration and the arrangement configuration of the sealing material that seals between the atmosphere and the housing and between the low-pressure side and the high-pressure side in the housing. Another object of the present invention is to provide a lightweight scroll compressor that can solve gas leakage due to pressure deformation of the scroll member without increasing its rigidity.

In order to solve the above problems, the scroll compressor of the present invention employs the following means.
That is, a scroll compressor according to the present invention includes, inside a housing, a scroll compression mechanism including a pair of fixed scroll members and a turning scroll member, and a drive shaft that drives the turning scroll member of the scroll compression mechanism to turn. In the scroll compressor, the housing includes a front housing and a rear housing that covers a body opening of the front housing that houses the scroll compression mechanism, and the front housing includes the scroll compression. The fixed-scroll member has a funnel shape including a large-diameter barrel portion for installing a mechanism and a smaller-diameter drive shaft support portion connected to the trunk portion for installing the drive shaft. A second end interposed between an end surface on the inner peripheral side of the outer periphery of the rear housing and an inner surface of the rear housing. The sealing material is fastened and fixed to the inner surface of the rear housing via a first bolt so as to partition a discharge chamber into which the gas compressed by the scroll compression mechanism is discharged on the inner peripheral side of the first sealing material. The first seal material divides the internal space of the housing into a discharge chamber and a suction chamber formed in a space excluding the discharge chamber, and further, the first seal member is located on the inner side of the outer periphery of the fixed scroll member end plate. A spigot portion is formed on the end surface on the side, and a fitting portion with the spigot portion is formed on the inner surface of the rear housing, the spigot portion is fitted to the fitting portion, and an outer periphery of the fitting position The fixed scroll member is interposed between the first seal material on the side, and the rear housing is connected to the rear housing through a screw boss portion formed on the inner peripheral side of the end portion of the end plate. The fixed scroll member is fixed to the inner surface of the ring by the first bolt, and the fixed scroll member is fastened and fixed to the rear housing via the screw boss portion on the inner peripheral side of the spigot portion, and the outer periphery of the screw boss portion and the spigot portion The first sealing material is interposed on the side .

According to the present invention, the fixed scroll member is fastened to the inner surface of the rear housing by the first bolt with the first seal material interposed between the end surface on the inner peripheral side of the outer periphery of the end plate and the inner surface of the rear housing. Since the discharge chamber is configured to be fixed on the inner peripheral side of the first sealing material, the area of the rear housing and the end plate of the fixed scroll member that receives pressure load due to high pressure is reduced. Can do. For this reason, the end plate of the fixed scroll member, the rear housing, and the first bolt can be made small.
That is, since the pressure load is reduced when the pressure receiving area is reduced, the stress is reduced in the member receiving the pressure. As the stress is reduced in this way, sufficient rigidity and strength can be ensured even if each member has a smaller structure for reducing the thickness and weight.
In addition, since the suction chamber is formed on the outer peripheral side of the first seal material that partitions the discharge chamber, even if gas leaks from the discharge chamber, it can be prevented from leaking directly to the atmosphere, By leaking the gas from the discharge chamber to the suction chamber when the high pressure rises abnormally, it is possible to avoid damage to the compressor due to the abnormal pressure rise. Further, since the inlay portion of the fixed scroll member is fitted into the fitting portion of the rear housing, and the fixed scroll member is installed on the outer peripheral side of the fitting position with the first seal material interposed therebetween, the first seal material The fixed scroll member can be accurately positioned with respect to the rear housing during assembly and fastened and fixed by the first bolt, and the fixed scroll member can be fixed to the screw boss portion and the Since it is fastened and fixed to the rear housing via one bolt, and the first seal material is interposed on the outer peripheral side of the screw boss part and the inlay part, the fixed scroll can be achieved by reducing the distance between the screw boss part and the first bolt. The pressure deformation of the end plate of the member can be suppressed, gas leakage due to the deformation of the end plate can be minimized, and a load is applied to the first sealing material. To reduce the force, it is possible to extend the life of the first sealing member.

  Furthermore, in the scroll compressor according to the present invention, in the scroll compressor described above, the rear housing includes a second sealing material that seals between the opening of the front housing and the atmosphere. The second sealing material seals the suction chamber from the atmosphere on the outer peripheral side of the first sealing material.

  According to the present invention, since the second sealing material seals between the suction chamber, that is, the low pressure and the atmosphere, the pressure difference between the sealed spaces can be reduced. Therefore, the sealing structure during this period can be simplified, and the second bolt and the fastening flange that fasten and fix the rear housing to the front housing can be made small.

Furthermore, the scroll compressor of the present invention, in any one of the scroll compressor described above, the rear housing, the second spigot portion fitted in said opening of the front housing is formed, the second spigot portion And the rear housing is fastened and fixed to the front housing by the second bolt.

According to the present invention, since the second spigot portion is fitted into the opening of the front housing, the front housing can suppress minute pressure deformation in the opening direction of the rear housing. Accordingly, it is possible to suppress gas leakage due to minute pressure deformation of the rear housing, the fixed scroll member, and the like.

Furthermore, the scroll compressor according to the present invention is characterized in that, in the scroll compressor, the second seal material is interposed between the second spigot part and the front housing.

According to the present invention, since the second seal member is interposed between the second spigot part and the front housing, even if the rear housing is subjected to minute pressure deformation in the opening direction, the second seal is thereby caused. The material is only moved in the axial direction. Therefore, the sealing function can be reliably maintained.

Furthermore, the scroll compressor according to the present invention is characterized in that, in any of the scroll compressors described above, the second seal material is disposed on the second spigot side.

According to the present invention, since the second seal material is installed on the second spigot side of the rear housing, it is only necessary to fit the second seal material into the spigot portion at the time of assembly, and at the time of assembling the second seal material. Can be facilitated.

Furthermore, the scroll compressor of the present invention is the scroll compressor described above, between the opening of the second spigot portion said second seal member the front housing and the mouth side of the installation section of the micro gap Is formed.

According to the present invention, since a minute gap is formed on the mouth side of the second sealant in the second spigot part, the second sealant is installed on the second spigot part and the spigot part is assembled. Can be easily fitted into the front housing opening.

Furthermore, the scroll compressor according to the present invention is characterized in that, in any of the scroll compressors described above, a first seal material is interposed at a corner portion between the spigot portion and the fitting portion. .

  According to the present invention, since the first seal material is interposed at the corner portion between the spigot portion and the fitting portion, the processing of the seal groove for installing the first seal material can be made unnecessary. Cost can be reduced.

  Furthermore, the scroll compressor according to the present invention is the scroll compressor according to any one of the above-described scroll compressors, in which the plate thickness of the outermost peripheral portion of the end plate on the outer peripheral side of the end plate of the fixed scroll member is the other portion. It is characterized by being formed thinner.

  According to the present invention, since the first seal material is interposed at the fitting position of the spigot portion, no high pressure is applied to the outer peripheral side portion of the end plate than the spigot portion. In addition, the thickness of the outermost peripheral portion of the end plate on the outer peripheral side can be made thinner than other portions. For this reason, the weight of the fixed scroll member can be reduced by an amount corresponding to the volume of the thin plate thickness, and the weight of the scroll compressor can be reduced.

  Furthermore, the scroll compressor according to the present invention is the scroll compressor according to any one of the above-described scroll compressors, wherein the scroll compression mechanism includes a pair of fixed scroll members and a swivel configured by a spiral wrap standing on the end plate. The scroll member is provided with step portions on the front end surface and the bottom surface of each of the spiral wraps, and the spiral wrap height is higher than the spiral wrap height on the inner peripheral side on the outer peripheral side of the spiral wrap. Thus, it is possible to perform a three-dimensional compression that can compress in the circumferential direction and the lap height direction.

  According to the present invention, it is possible to increase the compressor capacity without increasing the outer diameter of the scroll by increasing the height of the spiral wrap on the outer peripheral side of the fixed scroll member and the orbiting scroll member. As a result, the scroll compressor can be made compact and lightweight.

  Furthermore, in the scroll compressor according to any one of the above-described scroll compressors, the first bolt is provided on an end surface of the fixed scroll member at an end surface located on the inner peripheral side of the step portion of the bottom surface in the end plate. The screw boss portion to which the screw is fastened is formed.

  According to the present invention, the screw boss portion is formed in the portion where the thickness of the end plate is increased by forming the step portion on the bottom surface of the spiral wrap. Therefore, the thickness of the end plate is used for this screw boss portion. Thus, a screw hole for the first bolt that requires a screw allowance of at least 1.5 times the screw diameter can be provided. For this reason, the axial direction dimension of the scroll compressor in which the first bolt is dominant can be shortened, and the scroll compressor can be reduced in size and weight, and the mountability can be improved.

  Furthermore, in the scroll compressor according to the present invention, in the scroll compressor described above, the screw hole for the first bolt extends to the screw boss portion from the bottom surface on the outer peripheral side to the axial wrap side. It is characterized by being provided.

  According to the present invention, the screw hole that requires a screwing allowance of a required length is provided so as to extend from the bottom surface of the spiral wrap on the outer peripheral side of the step portion to the axial wrap side. The axial dimension of the scroll compressor in which 1 volt is dominant can be reduced as much as possible.

  Furthermore, the scroll compressor according to the present invention is characterized in that, in any of the scroll compressors described above, the screw boss portion is provided on an inner peripheral side with respect to the first seal material.

  According to the present invention, the screw boss portion is provided on the inner peripheral side with respect to the first seal material, and the fixed scroll member is fastened and fixed by the first bolt in the portion, so that the second portion interposed on the outer peripheral side of the screw boss portion. The force applied to one seal material can be reduced. For this reason, the lifetime of the first sealing material can be extended.

  Furthermore, the scroll compressor according to the present invention is characterized in that, in any of the scroll compressors described above, a clamp groove is provided on the outer periphery of the screw boss portion when the fixed scroll member is processed.

  According to the present invention, since the groove for the clamp used at the time of processing the fixed scroll member is provided on the outer periphery of the screw boss portion, even when the plate thickness of the outermost peripheral portion of the end plate in the fixed scroll member is reduced, The fixed scroll member can be clamped stably using this groove. Therefore, the fixed scroll member can be processed with high accuracy.

  Furthermore, the scroll compressor according to the present invention is characterized in that, in the scroll compressor described above, the groove is provided on the outer periphery of the screw boss portion over the entire periphery.

  According to the present invention, since the groove is provided on the outer periphery of the screw boss portion over the entire circumference, the weight of the fixed scroll member can be reduced by an amount corresponding to the volume of the groove, and the fixed scroll member can be reduced in weight.

According to the present invention, the first sealing material is interposed between the inner peripheral end surface of the fixed scroll member end plate and the inner surface of the rear housing, and the discharge chamber is partitioned on the inner peripheral side. The area where the scroll member end plate and the rear housing receive a pressure load due to the high pressure can be reduced. Therefore, the fixed scroll member end plate, the rear housing, and the first bolt for fastening and fixing them can be made small, the weight of the fixed scroll member and the housing can be reduced, and the compressor can be reduced in weight.
In addition, since the suction chamber is formed on the outer peripheral side of the first seal material, even if gas leaks from the discharge chamber, it can be prevented from leaking directly to the atmosphere. At the same time, when the pressure rises abnormally, the high pressure gas leaks from the discharge chamber to the suction chamber, so that the compressor can be prevented from being damaged due to the pressure rise.
Further, since the fixed scroll member is fitted to the fitting portion of the rear housing by the inlay portion and positioned and fixed, the fixed scroll member can be accurately positioned and assembled, and the fixed scroll member can be assembled with the inlay portion. Since the first bolt is tightened and fixed on the inner peripheral side of the part, the distance between the screw boss part and the first bolt is further reduced to further suppress the pressure deformation of the end plate of the fixed scroll member and minimize gas leakage In addition, since the first seal material is interposed on the outer peripheral side of the spigot portion, the force applied to the first seal material can be reduced and the life of the first seal material can be extended.

  In addition, the second sealing material is interposed between the rear housing and the front opening of the front housing so as to seal between the suction chamber having a small pressure difference and the atmosphere, so that the sealing structure using the second sealing material is simplified. In addition, the second bolt that fastens and fixes the rear housing to the front housing, the fastening flange, and the like can be made smaller. Therefore, this also reduces the weight of the housing and reduces the weight of the compressor.

Embodiments according to the present invention will be described below with reference to the drawings.
[First Embodiment]
Hereinafter, a first embodiment of the present invention will be described with reference to FIGS. 1 to 3.
FIG. 1 is a longitudinal sectional view of a scroll compressor 1 according to the first embodiment of the present invention.
The scroll compressor 1 has a housing 3 that constitutes its outline. The housing 3 is configured by integrally fastening and fixing a front housing 5 and a rear housing 7 with bolts 9 (second bolts). The front housing 5 and the rear housing 7 are integrally formed with flanges 5A and 7A for fastening at a plurality of positions on the circumference, for example, at four positions at equal intervals. By tightening the flanges 5 </ b> A and 7 </ b> A with bolts 9, the front housing 5 and the rear housing 7 are integrally coupled.

A crankshaft 11 is supported inside the front housing 5 so as to be rotatable about an axis L via a main bearing 13 and a sub-bearing 15. One end side (left side in the figure) of the crankshaft 11 is a small diameter shaft portion 11A, and this small diameter shaft portion 11A penetrates the front housing 5 and protrudes to the left side in FIG. As is well known, the projecting portion of the small-diameter shaft portion 11A is provided with a not-shown electromagnetic clutch, pulley, etc. for receiving power, and the power is transmitted from a drive source such as an engine, not shown, via a V-belt or the like. It will be.
A mechanical seal (lip seal) 17 is installed between the main bearing 13 and the sub-bearing 15 to hermetically seal between the inside of the housing 3 and the atmosphere.

  A large-diameter shaft portion 11B is provided on the other end side (right side in the drawing) of the crankshaft 11. Further, the large-diameter shaft portion 11B has an eccentric pin that is eccentric from the axis L of the crankshaft 11 by a predetermined dimension. 11C is provided integrally. The large-diameter shaft portion 11B and the small-diameter shaft portion 11A are rotatably supported by the front housing 5 via the main bearing 13 and the sub-bearing 15, respectively. A rotating scroll member 27, which will be described later, is connected to the eccentric pin 11C via a drive bush 19 and a drive bearing 21, and the rotating scroll member 27 is driven to rotate by rotating the crankshaft 11. ing.

The drive bush 19 is integrally formed with a balance weight 19 </ b> A for removing an unbalanced load that is generated when the orbiting scroll member 27 is orbitally driven, and is rotated with the orbiting drive of the orbiting scroll member 27. Yes.
A pair of fixed scroll member 25 and orbiting scroll member 27 constituting the scroll compression mechanism 23 are incorporated in the housing 3. The fixed scroll member 25 is composed of an end plate 25A and a spiral wrap 25B standing from the end plate 25A, while the orbiting scroll member 27 is a spiral standing from the end plate 27A and the end plate 27A. And a wrap 27B.

  As shown in FIG. 2, the fixed scroll member 25 and the orbiting scroll member 27 are stepped at predetermined positions along the spiral direction of the tip surfaces 25C and 27C and the bottom surfaces 25D and 27D of the spiral wraps 25B and 27B, respectively. 25E, 25F and 27E, 27F. With the stepped portions 25E, 25F and 27E, 27F as boundaries, the outer peripheral end surfaces 25G, 27G are high in the lap front end surfaces 25C, 27C, and the inner peripheral end surfaces 25H, 27H are lowered. ing. In the bottom surfaces 25D and 27D, the bottom surfaces 25I and 27I on the outer peripheral side are low in the direction of the axis L, and the bottom surfaces 25J and 27J on the inner peripheral side are high. Thereby, the spiral wraps 25B and 27B have the wrap height on the outer peripheral side higher than the wrap height on the inner peripheral side.

  The fixed scroll member 25 and the orbiting scroll member 27 are assembled in a state where the centers of the fixed scroll member 25 and the orbiting scroll member 27 are separated from each other by the orbiting radius and the spiral wraps 25B and 27B are engaged with each other with a phase difference of 180 degrees. Accordingly, as shown in FIG. 1, a pair of compression chambers 29 limited by the end plates 25A and 27A and the spiral wraps 25B and 27B are provided between the scroll members 25 and 27 with respect to the scroll center. It will be formed symmetrically. The compression chamber 29 has a height in the direction of the axis L that is higher than the height of the inner peripheral side on the outer peripheral side of the spiral wraps 25B and 27B, thereby enabling three-dimensional compression that can compress in the circumferential direction and the wrap height direction. Possible compression mechanism.

The fixed scroll member 25 is fixedly installed on the inner surface of the rear housing 7 with a bolt 31 (first bolt). In the orbiting scroll member 27, the eccentric pin 11C provided on one end side of the crankshaft 11 is connected to the boss portion provided on the back surface of the end plate 27A via the drive bush 19 and the drive bearing 21 as described above. Then, it is driven to turn.
Further, the orbiting scroll member 27 is supported by the thrust receiving surface 5B formed on the front housing 5 on the back surface of the end plate 27A, and is interposed between the thrust receiving surface 5B and the back surface of the end plate 27A. The orbiting scroll member 27 is configured to be revolved and driven with respect to the fixed scroll member 25 while being prevented from rotating by the rotation preventing mechanism 33 such as a ring or an Oldham ring.

  A discharge port 25K that discharges compressed refrigerant gas is opened at the center of the end plate 25A of the fixed scroll member 25, and a discharge reed valve that is attached to the end plate 25A via a retainer 35 at the discharge port 25K. 37 is provided. Further, a sealing material 39 (first sealing material) such as an O-ring is interposed on the back side of the end plate 25 </ b> A of the fixed scroll member 25 so as to be in close contact with the inner surface of the rear housing 7. Thus, a discharge chamber 41 partitioned from the internal space of the housing 3 is formed. Thereby, the internal space of the housing 3 excluding the discharge chamber 41 is configured to function as the suction chamber 43. The refrigerant gas returning from the refrigeration cycle is sucked into the suction chamber 43 via the suction port 45 provided in the front housing 5, and the refrigerant gas is sucked into the compression chamber 29 through the suction chamber 43. . Further, a sealing material 47 (second sealing material) such as an O-ring is interposed at the joint surface between the front housing 5 and the rear housing 7, and the suction chamber 43 formed in the housing 3 is hermetically sealed from the atmosphere. is doing.

  Here, as shown in FIG. 1, the front housing 5 has a large-diameter barrel portion 5C that accommodates the scroll compression mechanism 25, and the thrust receiving surface 5B that has a diameter reduced in a radial direction following the barrel portion 5C. A thrust receiving portion 5D for forming the bearing, a medium diameter crankshaft support portion 5F for forming a bearing housing portion 5E for housing the main bearing 13, the diameter of which is further reduced following the thrust receiving portion 5D, The sub-bearing 15 and the small-diameter boss portion 5G for installing the mechanical seal 17 following the crankshaft support portion 5F are provided, and formed so as to form a funnel shape whose diameter is gradually reduced.

On the other hand, as shown in FIG. 3, the rear housing 7 includes a recess 7 </ b> B for forming the discharge chamber 41, and an inlay portion 7 </ b> C (second inlay portion) fitted to the opening end of the body portion 5 </ b> C of the front housing 5. ) And a fitting portion 7D to which an inlay portion 25L provided on the back surface of the end plate 25A of the fixed scroll member 25 is fitted, and is formed to have a dish shape. The fitting portion 7D is formed on the outer peripheral side with respect to the tightening position of the bolt 31.
The inlay portion 7C is provided with the sealing material 47, and on the side closer to the mouth than the installation portion of the sealing material 47, the large diameter of the trunk portion 5C of the front housing 5, as shown in FIG. A minute gap S is formed between the opening and the opening. Then, with the inlay portion 7C fitted into the opening of the body portion 5C in the front housing 5, as described above, the flanges 5A and 7A of both the housings 5 and 7 are fastened and fixed with bolts 9. Both housings 5 and 7 are coupled in a state of being hermetically sealed from the atmosphere via a sealing material 47.

  Further, as shown in FIG. 3, an inlay portion 25 </ b> L of the fixed scroll member 25 is fitted into the fitting portion 7 </ b> D of the rear housing 7. In a state where the sealing material 39 is interposed in the corner portion formed between the fitting portion 7D and the inlay portion 25L, the fixed scroll member 25 is rear-mounted via a screw boss portion 25N formed in an annular shape on the end surface. It is fastened and fixed to the inner surface of the housing 7 with bolts 31. By adopting such a configuration, no high pressure is applied to the end plate outermost peripheral portion 25M on the outer peripheral side than the spigot portion 25L of the end plate 25A. Therefore, the end plate thickness of the end plate outermost peripheral portion 25M is not affected. The thickness is reduced to about half or less of the end plate thickness of the other part over the entire circumference.

  With the above configuration, the rear housing 7 and the fixed scroll member 25 are engaged with the fitting portion 7D and the spigot portion 25L, so that the fixed scroll member 25 is attached to the rear housing 7 regardless of the interposition of the seal material 39. It will be fixedly installed in the positioned state. In the fitting portion, the housing 3 has a high-pressure discharge chamber 41 and a low-pressure inside the housing 3 by the sealing member 39 interposed in the corner portion formed between the fitting portion 7D and the spigot portion 25L. A compartment seal is made with the suction chamber 43. Further, on the outer peripheral side of the seal member 39 that partitions the discharge chamber 41 and the suction chamber 43, as described above, the gap is interposed between the one end opening of the body portion 5C in the front housing 5 and the spigot portion 7C of the rear housing 7. By the mounted sealing material 47, the suction chamber, that is, the inside of the housing 3 and the atmosphere is hermetically sealed.

Next, the operation of the scroll compressor according to the present embodiment described above will be described.
When a rotational driving force is transmitted from an external drive source to the crankshaft 11 via a pulley, an electromagnetic clutch, etc. (not shown) and the crankshaft 11 is rotated, the eccentric pin 11C of the crankshaft 11 is connected to the eccentric pin 11C via the drive bush 19 and the drive bearing 21. The orbiting scroll member 27 coupled to the fixed scroll member 25 is driven to rotate orbit with respect to the fixed scroll member 25 while being prevented from rotating by the rotation preventing mechanism 33.

  By the revolution turning drive of the turning scroll member 27, the refrigerant gas in the suction chamber 43 is sucked into the compression chamber 29 formed at the outermost side in the radial direction. The compression chamber 29 is moved to the center side while the volume is reduced in the circumferential direction and the lap height direction after being closed by suction at a predetermined turning angle position. During this time, the refrigerant gas is compressed, and when the compression chamber 29 reaches a position where it communicates with the discharge port 25K, the discharge reed valve 37 is pushed open and the compressed gas is discharged into the discharge chamber 41. This compressed refrigerant gas Is discharged out of the compressor through the discharge chamber 41.

  Accordingly, the high-pressure compressed gas discharged into the discharge chamber 41 is arranged on the inner peripheral side of the sealing material 39 that defines the discharge chamber 41, the end plate 25 </ b> A of the fixed scroll member 25 that forms the discharge chamber 41, and the rear housing 7. And is loaded. Since the sealing material 39 is interposed between the end surface of the end plate 25A and the inner surface of the rear housing 7 at a position on the inner peripheral side with respect to the outer peripheral surface of the end plate 25A, the sealing material 39 is located on the inner peripheral side. Only the area of the end plate 25A and the rear housing 7 to which an excessive pressure load is applied can be reduced. Thereby, the pressure deformation due to the excessive pressure load on the end plate 25A and the rear housing 7 can be further miniaturized.

In addition, an excessive pressure load is not applied to the end plate outermost peripheral portion 25M in which the end plate thickness on the outer peripheral side of the end plate 25L of the end plate 25A on which the sealing material 39 is installed is reduced. Even if the thickness of the outermost peripheral portion 25M of the end plate is made thinner than other portions, there is no risk of pressure deformation due to high pressure, and compression performance and the like are not affected.
Further, even if a problem occurs in the sealing material 39, or a minute deformation occurs in the end plate 25A or the rear housing 7 due to an abnormal increase in the high pressure, a situation where a high-pressure compressed gas leaks, The discharge chamber 41 does not directly communicate with the atmosphere, and the compressed gas is leaked to the suction chamber 43 formed on the outer peripheral side of the discharge chamber 41. Accordingly, it is possible to avoid a situation in which the compressed gas flows out directly from the discharge chamber 41 to the atmosphere.

Therefore, according to this embodiment, there exist the following effects.
Since the sealing material 39 that partitions the discharge chamber 41 is interposed at a position on the inner peripheral side with respect to the outer peripheral surface of the end plate 25A of the fixed scroll member 25, the end plate 25A and the rear housing 7 receive a pressure load due to high pressure. The area of the receiving surface can be reduced. Therefore, the stress of the end plate 25A, the rear housing 7 and the bolt 31 can be slightly reduced. For this reason, weight reduction and cost reduction of the scroll compressor 1 can be achieved by reducing the plate | board thickness of these components.

  Further, since the suction chamber 43 is formed on the outer peripheral side of the sealing material 39 that partitions the discharge chamber 41, even if gas leaks from the discharge chamber 41, it is prevented from leaking directly into the atmosphere. be able to. Furthermore, when the abnormal pressure rises, the compressed gas is leaked from the discharge chamber 41 to the suction chamber 43, so that the compressor can be prevented from being damaged due to the abnormal pressure rise. Incidentally, even if the high-pressure gas leaks from the discharge chamber 41 to the suction chamber 43, no particular trouble is caused.

  In addition, since the sealing material 47 that seals between the suction chamber 43 and the atmosphere is interposed on the outer peripheral side of the sealing material 39, the sealing material 47 can seal a portion where the pressure difference between the low pressure and the atmosphere is small. Any sealing material may be used as long as the sealing material 39 has a slightly lower function and lower cost than the sealing material 39. Further, since the front housing 5 and the rear housing 7 can be fastened and fixed at a portion where the pressure difference is small, the bolts 9 and the fastening flanges 5A and 7A can be made small. Accordingly, it is possible to achieve weight reduction and cost reduction.

  Further, since the inlay portion 7C provided in the rear housing 7 is fitted into the opening portion of the body portion 5C of the front housing 5 and the both housings 5 and 7 are coupled, the rear housing 7 in the opening direction is opened. Pressure deformation can be suppressed by the front housing 5. Therefore, the minute pressure deformation of the rear housing 7 can be further suppressed, and the gas leakage due to the pressure deformation can be further minimized. Further, since the seal material 47 is interposed in the inlay portion 7C, the seal material 7 moves in the axial direction against pressure deformation in the opening direction of the rear housing 7. For this reason, a sealing function is not impaired and a seal | sticker can be maintained reliably. Accordingly, this also prevents gas leakage. Furthermore, since the sealing material 47 is installed on the side of the inlay portion 7C, the sealing material 47 can be easily held, and a minute gap S is formed between the inlay portion 7C and the opening of the front housing 5. For this reason, the inlay portion 7C is easily fitted. Therefore, assembly can be facilitated.

Further, since the inlay portion 25L of the fixed scroll member 25 is fitted to the fitting portion 7D of the rear housing 7, and the fixed scroll member 25 is fixedly installed with the seal material 39 interposed on the outer peripheral side thereof, the seal Regardless of the interposition of the material 39, the fixed scroll member can be accurately positioned with respect to the rear housing during assembly.
Moreover, since the sealing material 39 is interposed in the corner portion between the inlay portion 25L and the fitting portion 7D, the processing of the seal groove for installing the sealing material 39 becomes unnecessary, and the processing cost can be reduced. .

  Further, since an excessive load due to high pressure is not applied to the outermost peripheral portion 25M of the end plate 25A in the fixed scroll member 25, the thickness of the outermost peripheral portion 25M of the end plate can be made thinner than the other portions. it can. For this reason, the weight of the fixed scroll member 25 can be reduced, and the scroll compressor 1 can be reduced in weight. In particular, since the portion 25M is the outermost peripheral portion of the end plate 25A, the material can be reduced by an amount corresponding to its volume by reducing the plate thickness over the entire periphery. Accordingly, it is possible to reduce the corresponding weight and the amount of material used, and thereby achieve a weight reduction and cost reduction effect.

  Further, in the present embodiment, the scroll compression mechanism 23 is configured such that the spiral wrap height is higher than the spiral wrap height on the inner peripheral side on the outer peripheral side of the spiral wraps 25B and 27B, and in the circumferential direction and the wrap height direction. Since the three-dimensional compression is possible, the capacity can be increased without increasing the scroll outer diameter. This also makes it possible to reduce the size and weight of the scroll compressor.

[Second Embodiment]
Next, a second embodiment of the present invention will be described with reference to FIG.
The present embodiment is characterized by a fixed installation structure of the fixed scroll member 25 with respect to the rear housing 7. Since other points are the same as those in the first embodiment, description thereof will be omitted.
FIG. 4 shows a cross-sectional view of a portion where the fixed scroll member 25 is fastened and fixed to the rear housing 7 by bolts 31.
In the present embodiment, on the back side of the end plate 25 </ b> A of the fixed scroll member 25, there is a sealing material 39 </ b> A that is on the inner peripheral side than the step portion 25 </ b> F provided on the bottom surface 25 </ b> D and that partitions the discharge chamber 41. A screw boss portion 25N is provided at a position closer to the inner periphery than the installed spigot portion 25L. The screw boss portion 25N protrudes from the end face of the end plate 25A along the axis L direction to the wrap side (right side in FIG. 4) and is provided in an annular shape.

  And this screw boss part 25N is processed with screw holes 25P for tightening the bolts 31 at 3 to 4 places at appropriate intervals in the circumferential direction. The screw hole 25P is provided in the screw boss portion 25N so as to extend by a dimension T on the lap side in the axis L direction with respect to the bottom surface 27I on the outer peripheral side than the step portion 25F. That is, using the fact that the bottom surface 27J on the inner peripheral side is higher in the axis L direction than the bottom surface 27I on the outer peripheral side than the stepped portion 25F, this portion is at least 1.5 times the screw diameter. The screw hole 25P, which requires a length, is processed by extending the dimension T.

In this embodiment, instead of the sealing material 39 installed in the corner portion of the inlay portion 25L in the first embodiment, a seal groove 25Q is provided on the end face on the outer peripheral side of the inlay portion 25L of the end plate 25A. A sealing material 39A such as a ring is provided.
The sealing material 39A may be provided on the end face on the outer peripheral side of the screw hole 25P in the screw boss portion 25M, thereby further reducing the area of the portion receiving the pressure load due to the high pressure.

With the above configuration, according to the present embodiment, the following operational effects are obtained.
By providing the step portion 25F, a screw boss portion 25N is formed at a portion where the thickness of the end plate 25A is increased, and the screw boss portion 25N has a length of at least 1.5 times the screw diameter using the thickness. Since the screw hole 25P for the bolt 31 that requires a screw allowance is provided, it is not necessary to particularly increase the length in the axis L direction of the screw boss portion 25N in order to provide the screw hole 25P having a required dimension. For this reason, the dimension of the axis L direction of the scroll compressor 1 in which the bolt 31 is dominant can be shortened. Accordingly, the scroll compressor 1 can be reduced in size and weight, and the mountability can be improved.

In particular, since the screw hole 25P extends from the bottom surface 25I on the outer peripheral side of the step portion 25F by a dimension T on the lap side in the axis L direction, the axis of the scroll compressor 1 in which the bolt 31 is dominant. The dimension in the L direction can be shortened by at least the dimension T or more. Therefore, the effect of reducing the size and weight of the scroll compressor 1 can be enhanced as much as possible.
Further, since the screw boss portion 25N is provided on the inner peripheral side with respect to the seal material 39A and the fixed scroll member 25 is fastened and fixed at the position by the bolt 31, the force applied to the seal material 39A can be reduced. Therefore, the life of the sealing material 39A can be extended.

[Third Embodiment]
Next, a third embodiment of the present invention will be described with reference to FIG.
This embodiment is different from the first and second embodiments described above in that the fixed scroll member 25 is provided with a clamping groove 25R during processing. Since other points are the same as those in the first and second embodiments, description thereof will be omitted.
FIG. 5 is a partial cross-sectional view showing a part of the fixed scroll member 25.
In the present embodiment, a groove 25R for clamping the fixed scroll member 25 with a chuck or the like at the time of processing is provided on the outer peripheral portion of the screw boss portion 25N of the fixed scroll member 25. The groove 25R may be provided only in a necessary range corresponding to the chuck or the like, or may be provided on the entire circumference of the screw boss portion 25N.

The fixed scroll member 25 is generally formed by cutting the lap surface of the spiral wrap 25B with an end mill. At this time, the outer peripheral surface of the end plate 25A is processed by being clamped by a chuck or the like. As shown in the first and second embodiments, the outermost peripheral portion 25M of the end plate 25A in the fixed scroll member 25 is processed. If the plate thickness is reduced, distortion may occur during clamping, which may affect machining accuracy.
Thus, as in the present embodiment, in the fixed scroll member 25, the end plate 25A has the largest thickness and the rigidity of the screw boss portion 25N is increased, and a clamping groove 25R is provided. By clamping and processing the member 25, the fixed scroll member 25 can be stably fixed during processing. Therefore, the fixed scroll member 25 can be processed with high accuracy.

  Further, by providing the groove 25R over the entire circumference of the screw boss portion 25N, the weight of the fixed scroll member 25 can be reduced by a weight corresponding to the volume of the groove 25R, and the fixed scroll member can be reduced in weight. .

  In each of the above embodiments, the scroll compressor provided with a compression mechanism capable of three-dimensional compression that can be compressed in the circumferential direction and the lap height direction has been described, but the present invention is not limited to this, About the invention concerning 1st and 3rd embodiment, it can apply also to the normal scroll compressor which is not provided with the step part in the wrap height direction, and can compress only to the circumferential direction.

It is a longitudinal section of the scroll compressor concerning a 1st embodiment of the present invention. It is an external appearance perspective view (A) and (B) of the fixed scroll member and turning scroll member of the scroll compressor shown in FIG. It is a partial expanded sectional view of the scroll compressor shown in FIG. It is a partial expanded sectional view of the scroll compressor which concerns on 2nd Embodiment of this invention. It is a partial expanded sectional view of the fixed scroll member concerning a 3rd embodiment of the present invention.

1 Scroll compressor 3 Housing 5 Front housing 5C Body 5F Crankshaft support (drive shaft support)
7 Rear housing 7C Inlay part (second inlay part)
7D Fitting part 9 bolt (second bolt)
11 Crankshaft (drive shaft)
23 Scroll compression mechanism 25 Fixed scroll member 25A End plate 25B Spiral wrap 25C Front end surface 25D Bottom surface 25E, 25F Stepped portion 25I Bottom surface 25L Inlay portion 25M End plate outermost peripheral portion 25N Screw plate boss portion 25P Screw hole 25R groove 27 orbiting scroll member 27A end plate 27B spiral wrap 27C tip surface 27D bottom surface 27E, 27F step 31 bolt (first bolt)
39,39A Sealing material (first sealing material)
41 Discharge chamber 43 Suction chamber 47 Sealing material (second sealing material)
S Minute gap

Claims (14)

In a scroll compressor in which a scroll compression mechanism constituted by a pair of fixed scroll members and a orbiting scroll member and a drive shaft that orbits and drives the orbiting scroll member of the scroll compression mechanism are housed and installed inside the housing.
The housing is composed of a front housing and a rear housing that covers a body opening of the front housing that houses the scroll compression mechanism,
The front housing has a funnel shape including the large-diameter barrel portion where the scroll compression mechanism is installed, and a smaller-diameter drive shaft support portion connected to the trunk portion where the drive shaft is installed,
The fixed scroll member discharges the gas compressed by the scroll compression mechanism by a first seal member interposed between the end surface on the inner peripheral side of the outer periphery of the end plate and the inner surface of the rear housing. The discharge chamber is clamped and fixed to the inner surface of the rear housing via a first bolt so as to partition the inner circumference side of the first seal material,
The first seal material divides the internal space of the housing into the discharge chamber and a suction chamber formed in a space excluding the discharge chamber,
Furthermore, an inlay portion is formed on the end surface on the inner side of the outer periphery of the fixed scroll member end plate, and a fitting portion with the inlay portion is formed on the inner surface of the rear housing, and the inlay portion is inserted into the fitting portion. A screw boss part that is fitted to a joint part, and the fixed scroll member is formed on the inner peripheral side of the end plate end surface with the first sealing material interposed on the outer peripheral side of the fitting position. Fixed to the inner surface of the rear housing via the first bolt,
The fixed scroll member is fastened and fixed to the rear housing via the screw boss portion on the inner peripheral side of the spigot portion, and the first seal material is interposed on the outer peripheral side of the screw boss portion and the spigot portion. scroll compressor, characterized in that there. The rear housing is fastened and fixed to the opening of the front housing by a second bolt with a second sealing material that seals between the opening and the atmosphere.
2. The scroll compressor according to claim 1, wherein the second sealing material seals the suction chamber from the atmosphere on an outer peripheral side of the first sealing material. Said rear housing, said the second spigot portion fitted in said opening of the front housing forming said second said rear housing to the front housing fitted to said second spigot portion in the opening The scroll compressor according to claim 1, wherein the scroll compressor is fastened and fixed by a bolt. The scroll compressor according to claim 3, wherein the second seal member is interposed between the second spigot part and the front housing. 5. The scroll compressor according to claim 3, wherein the second sealing material is installed on the second spigot side. 6. The scroll compression according to claim 5, wherein a minute gap is formed between the mouth side of the second spigot portion than the installation portion of the second sealing material and the opening of the front housing. Machine. The scroll compressor according to any one of claims 1 to 6, wherein a first sealing material is interposed at a corner portion between the inlay portion and the fitting portion. Thickness of the end plate outermost peripheral portion of the socket portion outer peripheral side than at the end plate of said stationary scroll member, to any one of claims 1, characterized in that it is thinner than other portions 7 The scroll compressor described. In the scroll compression mechanism, a pair of the fixed scroll member and the orbiting scroll member configured by setting up spiral wraps on the end plate are respectively provided on a front end surface and a bottom surface of the spiral wrap. A configuration in which the spiral wrap height is higher than the spiral wrap height on the inner peripheral side on the outer peripheral side of the spiral wrap so that compression in the circumferential direction and the wrap height direction is possible. The scroll compressor according to any one of claims 1 to 8 , wherein The screw boss portion to which the first bolt is fastened and fixed is formed on an end surface of the end plate of the fixed scroll member at an inner peripheral side with respect to a step portion of the bottom surface. 9. The scroll compressor according to 9 . 11. The scroll compression according to claim 10 , wherein the screw boss portion is provided with a screw hole for the first bolt extending from the bottom surface on the outer peripheral side to the axial wrap side than the stepped portion. Machine. The scroll compressor according to claim 10 or 11 , wherein the screw boss portion is provided on an inner peripheral side with respect to the first sealing material. The scroll compressor according to any one of claims 9 to 12 , wherein a clamp groove used in processing the fixed scroll member is provided on an outer periphery of the screw boss portion. The scroll compressor according to claim 13 , wherein the groove is provided on the outer periphery of the screw boss portion over the entire periphery.

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