JP5176212B2 - Vane type compressor - Google Patents

Description

  The present invention relates to a technique for improving the accuracy of centering (centering) of a bearing portion that holds a drive shaft in assembling a vane compressor.

  In an ordinary vane type compressor, a cylindrical rotor that stores a vane is fixed to a drive shaft that rotates by receiving a driving force of an engine or the like, and the rotor is stored in an elliptical hole in the cylinder. The front and rear end surfaces are sealed with a sealing member (referred to as a front / rear head or a side block). The clearance between the short diameter part of the elliptical hole of the cylinder and the outer diameter of the rotor needs to be set as small as possible in order to reduce the leakage of the compressed gas to the adjacent compression chamber. The sealing means before and after the cylinder is provided with a bearing portion for holding the drive shaft, and the shaft core of this bearing portion and the elliptical shaft core of the cylinder are accurately aligned (centered). However, it is important to improve the performance and reliability of the compressor.

As a technique for tackling the above-described problems, a technique using a dummy rotor for centering is disclosed (see Patent Documents 1 and 2). This dummy rotor for centering is a member having a virtual rotor part and a virtual drive shaft part, and when assembling the cylinder and one of the sealing means, this dummy rotor is arranged in the cylinder. Thus, the center of the elliptical hole of the cylinder and the center of the through hole as the bearing portion of the sealing means are prevented from shifting. In addition, as a general alignment method for arranging a plurality of mechanical parts at relatively correct positions, positioning holes are provided in the respective target parts (usually two locations), and positioning is performed in each pin hole. A method of aligning the position of each part by inserting a pin, or by providing a cylindrical boss part on one of the opposing parts and a cylindrical hole on the other part and fitting the cylindrical parts together, the core of each part Often, a method of aligning (so-called inlay alignment) or the like is used.
JP-A-4-58094 JP-A-11-210651

  However, in the method of using a dummy rotor such as those disclosed in Patent Documents 1 and 2, a special member called a dummy rotor is required, and in the assembling process, a process of installing and removing the dummy rotor, etc. A special process was required, and there were problems in terms of workability and operation costs. In addition, in the method of using the positioning pin, the positioning of the sealing member and the cylinder is adjusted due to the fact that a certain degree of error must be taken into account in the pin hole position itself, and that a predetermined clearance exists between the pin and the pin hole. There is a problem that cannot be performed with high accuracy. Further, in the method of aligning the core by inlay alignment, when a predetermined clearance is given to the boss portion and the hole, each component within the clearance range can move relatively in the radial direction, and the position of the sealing member and the cylinder The alignment cannot be performed with high accuracy. Further, when the boss is pressed in with a negative clearance of the boss portion so as not to move in the radial direction, there is a problem that the cylinder is deformed and the elliptical hole in the cylinder is distorted.

  Therefore, the present invention aims to enable accurate centering without requiring a special separate member and without increasing the assembly process.

In order to solve the above problems, the present invention forms a rotor fixed to a drive shaft, a vane slidably accommodated in a vane groove formed in the rotor, and a hole in which the rotor and the vane are accommodated. A vane type compressor having a cylinder, a front side sealing member that seals the front side of the cylinder, and a rear side sealing member that seals the rear side of the cylinder. Projections projecting in the radial direction of the rotor are formed at a joint portion with the front-side sealing member and a joint portion between the cylinder and the rear-side sealing member, and the projection has a short-diameter portion of the hole. It is provided so as to avoid it .

  According to this configuration, when the cylinder, the front-side sealing member, and the rear-side sealing member are assembled, only the protrusions are in contact with each other at the joint portion of each member. As a result, there is no clearance between the members, and these members do not move in the radial direction, so that the cores can be reliably aligned. In addition, the deformation during press-fitting is mainly only the portion of the cylindrical portion of the front side sealing member and the rear side sealing member that comes into contact with the projection, so that the members such as the cylinder are not greatly deformed and are reliably The core can be adjusted. As a result, accurate centering, i.e., through-holes in the front-side sealing member, through-holes in the cylinder, and through-holes in the rear-side sealing member can be performed without using other members as in the prior art and without increasing the assembly process. The center of the hole can be aligned.

  In the configuration described in claim 1, it is preferable that three or more protrusions are formed with respect to one joint portion (claim 2).

  In order to perform accurate centering, it is necessary that at least three protrusions be formed at each joint portion.

  Further, in the configuration according to claim 1 or 2, the protrusion is formed on a portion of the cylinder that contacts the front side sealing member and a portion of the cylinder that contacts the rear side sealing member. (Claim 3).

  The protrusions are preferably formed in, for example, flange-shaped portions provided at the front end portion and the rear end portion of the cylinder.

  Further, in the configuration according to claim 1 or 2, the protrusion is formed on a portion of the front side sealing member that contacts the cylinder, and on a portion of the rear side sealing member that contacts the cylinder. It may be formed (claim 4).

  Thus, even when the protrusions are formed on the front side and rear side sealing members, the same effects as those obtained when the protrusions are formed on the cylinder can be obtained.

Further, in the above-described configuration, since the protrusion is provided so as to avoid the short diameter portion of the hole, it is possible to avoid contact between the rotor and the inner peripheral surface of the hole during assembly during compression. Become.

  The elliptical hole formed in the cylinder is designed so that the clearance between the short diameter part and the outer diameter of the rotor is as small as possible. Therefore, the deformation of the cylinder causes the short diameter part of the hole to shrink in the radial direction. If this happens, there will be a problem that the inner wall surface of the hole comes into contact with the outer peripheral surface of the rotor. Therefore, as in this configuration, the projection is provided so as to avoid the short diameter portion, that is, avoiding the inside of a predetermined circumferential angle from the radial extension line of the short diameter portion, so that the cylinder and front side sealing are provided. When the member and the rear side sealing member are assembled, even if the cylinder is slightly deformed, there is almost no influence on the dimension of the short diameter portion, and there is no possibility that the rotor contacts the hole.

As described above, according to the present invention, the protrusion protruding in the radial direction of the rotor is formed in the joint portion between the cylinder and the front side sealing member and the joint portion between the cylinder and the rear side sealing member. Therefore, when assembling the cylinder, the front side sealing member, and the rear side sealing member, accurate centering is performed without using other members as in the past and without increasing the assembly process. Therefore, it is possible to provide a vane compressor with high performance and reliability. Further, since the protrusion is provided so as to avoid the short diameter portion of the hole, even when the cylinder is slightly deformed when the cylinder, the front side sealing member, and the rear side sealing member are assembled, the rotor is not It is possible to avoid the inconvenience of contacting the inner peripheral surface of the hole.

It is sectional drawing which shows the structural example of the vane type compressor to which Example 1 of this invention is applied. It is a perspective view which shows the assembly | attachment state of the vane type compressor to which Example 1 of this invention is applied. It is a figure which shows roughly the coupling | bond part of the cylinder which concerns on Example 1, a front head, and a rear head, (a) shows the state before coupling | bonding, (b) shows the state after coupling | bonding. 1 is an enlarged perspective view of a cylinder according to Embodiment 1. FIG. FIG. 3 is a plan view from the front side of the cylinder according to the first embodiment. It is a figure which shows the shape of protrusion. FIG. 6 is a plan view from the cylinder side showing the structure of a rear head according to a second embodiment. FIG. 6 is a plan view from the cylinder side showing a structure of a front head according to a second embodiment.

Explanation of symbols

1 Vane type compressor 2 Cylinder 3 Front head (front side sealing member)
4,61 Rear head (rear side sealing member)
5, 62 Drive shaft 6 Rotor 7 Vane 10 Hole 30 Through hole 31 Through hole 33 Rear side flange 34 Joint frame part 41 Front side flange 43 Joint frame part 50, 65 Projection

  Hereinafter, embodiments of the present invention will be described with reference to the accompanying drawings. In the different embodiments, the description of the same or similar parts that are the same as those of the other embodiments will be omitted.

  1 and 2 show a vane compressor 1 used as a part of a vehicle air conditioner. The vane compressor 1 includes a cylinder 2 constituting a compression chamber, and a front end face of the cylinder 2. The front head 3 that seals the rear, the rear head 4 that seals the rear end face of the cylinder 2, the drive shaft 5 that rotates by receiving the driving force of the engine, the rotor 6 that is fixed to the drive shaft 5, and slides on the rotor 6 A plurality (five in this example) of vanes 7 that can be accommodated are provided.

  A hole 10 having an elliptical cross section is formed in the cylinder 2, and the rotor 6 and the vane 7 are accommodated in the hole 10. The rotor 6 has a perfect circular cylindrical shape having a diameter substantially coincident with the elliptical minor axis of the hole 10, and the outer wall of the rotor 6 and the minor axis part of the hole 10 come into contact with each other, whereby the hole 10 and the rotor are arranged. Two compression chambers 11 are formed so as to include the long diameter portion of the hole 10. The rotor 6 is formed with five vane grooves 12, and these vane grooves 12 have a shape inclined at a predetermined angle in the rotation direction of the rotor 6 with respect to the radial direction from the rotation center of the rotor 6. ing. Each vane 7 is inserted into each vane groove 12, and the tip of the inner wall of the hole 10 is slidably contacted with the inner wall of the hole 10 by centrifugal force as the rotor 6 rotates. Slide. As a result, when the vane 7 advances from the long diameter portion to the short diameter portion of the hole 10 as the rotor 6 rotates, the volume of the compression chamber 11 partitioned by the vane 7 gradually decreases. The fluid is compressed. The drive shaft 5 is rotatably supported by the front head 3 and the rear head 4 via a bearing and a seal material, and one end thereof is fixed to the rotating plate 15. The rotating plate 15 can be connected or disconnected via an electromagnetic clutch mechanism to a pulley 16 that rotates in response to the rotation of an engine or the like. Further, in the vane compressor 1 according to this example, the front head 3 is configured to cover the entire cylinder 2 and a part of the rear head 4, and the suction chamber 20 is formed in the front head 3. In addition, a discharge chamber 21 is formed in the rear head 4. The suction chamber 20 communicates with the vicinity of the long diameter portion of the hole 10 in the compression chamber 11, and the discharge chamber 21 communicates with the vicinity of the short diameter portion of the hole 10 in the compression chamber 11. According to the vane compressor 1 having the above-described configuration, the refrigerant flowing out from the evaporator of the refrigeration cycle flows into the suction chamber 20 through the check valve 25 and is compressed in the compression chamber 11 to the discharge chamber 21. It flows in and is discharged from the discharge chamber 21 toward the condenser of the refrigeration cycle.

  2, the assembled state of the cylinder 2, the front head 3, the rear head 4, the rotor 6, and the drive shaft 5 is shown. As a procedure of the assembling work, first, the rear surface portion of the cylinder 2 is joined to the front surface portion of the rear head 4, and then the rotor 6 and the vane 7 are placed in the hole 10 of the cylinder 2, and the rear end portion of the drive shaft 5 is connected to the rear head 4. Then, the front head 3 is joined to the front surface portion of the rear head 4 so as to cover the entire cylinder 2 and the front end portion of the drive shaft 5 is inserted into the through hole 31 of the front head 3.

  As shown in FIGS. 2 and 3, a rear side flange 33 is provided on the rear surface portion of the cylinder 2, and the rear side flange 33 is brought into close contact with the inside of the joining frame portion 34 provided on the front surface portion of the rear head 4. As a result, the cylinder 2 and the rear head 4 are assembled. The rear surface portion of the front head 3 is a hollow cylindrical portion 36, and inside the cylindrical portion 36 is a first stepped portion 37 and an outer end (rear side) than the first stepped portion 37. The second stepped portion 38 is provided on the end) side, and an inclined surface 39 is provided on the surface from the first stepped portion 37 to the second stepped portion 38 so that the inner diameter of the cylindrical portion 36 gradually increases. It has been. A front flange 41 is provided on the front surface of the cylinder 2. As shown in FIG. 3B, the front head 3, the cylinder 2, and the rear head 4 are assembled by bringing the front flange 41 of the cylinder 2 into close contact with the first step portion 37 of the front head 3, This is performed by bringing the inner wall surface of the joint frame portion 43 existing at the outer (rear) end of the front head 3 from the second stepped portion 38 into close contact with the outer wall surface of the joint frame portion 34 of the rear head 4.

  In the vane type compressor 1 according to the present invention, as shown in FIGS. 4 and 5, a plurality of protrusions 50 are provided on the front side flange 41 and the rear side flange 33 of the cylinder 2. The cylinder 2 is made of a material such as an aluminum alloy, and a projection 50 is provided on the material of the cylinder 2 in advance by giving a predetermined cutting allowance. When the cylinder 2 is processed, the portions of the flanges 41 and 33 where the protrusion 50 is not provided are clamped, and the hole 10 and the protrusion 50 are milled. Since the simultaneous processing can be performed without removing the clamp portion, the positional relationship between the hole 10 and the protrusion 50 can be managed with high accuracy. In this example, six of these protrusions 50 are formed on the flanges 33 and 41 at regular intervals so as to avoid the short-circuited portion of the hole 10. Further, as shown in FIG. 6, each of the surfaces or sides constituting the protrusion 50 has an R shape, and the width L1 is 10 mm or less (preferably about 3 mm) and is long. It is preferable that the length L2 is 10 mm or less (preferably about 5 mm) and the height L3 is 10 mm or less (preferably about 0.7 mm).

  When the cylinder 2, the front head 3, and the rear head 4 are assembled, the members 2, 3, and 4 are press-fitted so that the state shown in FIG. 3A is changed to the state shown in FIG. 3B. Go. At this time, since the projections 50 whose sides are rounded contact the inclined surface 39 at the joint portions of the members 2, 3 and 4, the contact resistance at the time of assembly can be reduced. , 3 and 4 smoothly move to the proper positions where the axes are aligned. Moreover, since the protrusion 50 is in contact with the inclined surface 39 when the joining is completed, only the contact portion of the cylindrical portion 36 of the front head 3 bulges radially outward, thereby suppressing the distortion of the cylinder 2 itself. it can. Further, since the protrusion 50 is provided to avoid the short diameter portion of the hole 10, even if the cylinder 2 is slightly deformed, the dimension of the short diameter portion is hardly affected, and the rotor 6 may come into contact with the hole 10. There is no. Thereby, the center of each of the through hole 31 of the front head 3, the hole 10 of the cylinder 2, and the through hole 30 of the rear head 4 can be obtained without using other members as in the prior art and without increasing the assembly process. It is possible to accurately match the passing line (see the dashed line in FIG. 2).

  The present invention is not limited to the number, formation position, shape, and the like of the protrusions 50 shown in the present embodiment, and the configuration of the sealing means (with or without side blocks), and includes various variations. Is.

  7 and 8, the configurations of the rear head 61 and the front head 62 according to the present embodiment are shown. In the rear head 61, six protrusions 65 are formed on the inner wall surface of the joint frame portion 34 (see FIG. 3). In the front head 62, the first step portion 37 (see FIG. 3) and the vicinity thereof are formed. Six protrusions 65 are formed on the inclined surface.

  Even with such a configuration, as in the first embodiment, the pressure at the time of press-fitting is absorbed by the protrusions, and distortion of the flanges 33 and 41 of the cylinder 2 and the rear head 61 and the front head 62 itself can be prevented. . Thereby, it passes through the respective centers of the through hole 67 of the front head 62, the hole 10 of the cylinder 2 and the through hole 68 of the rear head 61 without using other members as in the prior art and without increasing the assembly process. It is possible to accurately match the lines (see the dashed line in FIG. 2).

Claims (4)

A rotor fixed to the drive shaft,
A vane slidably housed in a vane groove formed in the rotor;
A cylinder formed with a hole for accommodating the rotor and the vane;
A front side sealing member for sealing the front side of the cylinder;
A rear side sealing member for sealing a rear surface side of the cylinder;
In a vane type compressor configured to have
Projections projecting in the radial direction of the rotor are formed at joint portions between the cylinder and the front-side sealing member and joint portions between the cylinder and the rear-side sealing member . A vane type compressor characterized by being provided so as to avoid a short diameter portion .   2. The vane compressor according to claim 1, wherein the protrusion is formed at three or more locations with respect to one joining portion.   The said protrusion is formed in the part contact | abutted with the said front side sealing member of the said cylinder, and the part contact | abutted with the said rear side sealing member of the said cylinder, The Claim 1 or 2 characterized by the above-mentioned. Vane type compressor.   The protrusion is formed at a portion of the front side sealing member that contacts the cylinder and at a portion of the rear side sealing member that contacts the cylinder. 2. The vane type compressor according to 2.

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