JP2008196322A - Rotary compressor - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a rotary compressor employing a fixing structure of a rear muffler to a rear head, capable of inhibiting distortion of a face surface of the rear muffler. <P>SOLUTION: A bearing part 14a of the rear head 14A is formed with a concavity 14f extending from a side exterior surface toward a crankshaft side. With this, even when biasing force (pressing force) is applied from the rear muffler 17A toward a bearing part 14a side, stress concentration is caused at the concavity 14f formed in the bearing part 14a of the rear head 14A and an area of the concavity 14f is deformed. <P>COPYRIGHT: (C)2008,JPO&INPIT

Description

  The present invention relates to a rotary compressor, and more particularly to an improvement in the structure of a rotary compressor.

<Overall configuration of rotary compressor>
With reference to FIG. 3, the whole structure of a rotary compressor is demonstrated. FIG. 3 is a longitudinal sectional view showing the overall configuration of the rotary compressor. A compression element 7 for sucking and compressing gas is disposed on the lower end side of the casing 1 corresponding to the suction pipes 5a and 5b, and a drive element 8 for operating the compression element 7 is disposed above the compression element 7 in the inner space. It is arranged to occupy the whole area. In the internal space defined by the lower lid 4 at the lower end portion of the casing 1, an oil reservoir 9 for storing the lubricating oil O is formed, and in other spaces, a storage space 10 for storing the compressed gas is formed. .

<Compression element 7>
The compression element 7 has a configuration in which cylinder chambers are arranged in two upper and lower stages, and includes cylinders 12a and 12b having cylinder chambers 11a and 11b having circular cross-sectional shapes, and the cylinders 12a and 12b are provided on both upper and lower surfaces. The cylinder heads 11a and 11b are connected to each other by fastening a front head 13 having a boss-shaped bearing portion 13a in the center and a rear head 14 having a boss-shaped bearing portion 14a in the center with a plurality of through bolts 15. It is sealed.

  The cylinders 12a and 12b are supported in the casing 1 in a horizontal state. The front head 13 is provided with a discharge port 13c, and around the bearing portion 13a of the front head 13, an annular gap is provided between the front head 13 and the bearing portion 13a so that the front muffler 16 is fixed to the front head 13. Has been. The rear head 14 is provided with a discharge port 14 c, and a rear muffler 17 that fixes the oil reservoir 9 and the discharge space is fixed to the rear head 14 around the bearing portion 14 a of the rear head 14.

  Rollers 19a and 19b are disposed in the cylinder chambers 11a and 11b of the cylinders 12a and 12b, respectively. The rollers 19a and 19b are disposed on the outer periphery of the eccentric portions 20a and 20b of the crankshaft 26.

<Drive element 8>
The drive element 8 includes an electric motor including a stator 24 and a rotor 25, and the stator 24 is fixedly supported on the inner wall surface of the intermediate cylinder 2 of the casing 1. The rotor 25 is arranged concentrically inside the stator 24 with a predetermined gap in the circumferential direction. The upper half portion of the crankshaft 26 is rotatably integrated around the shaft center inside the rotor 25, and the lower half portion of the crankshaft 26 is rotatably fitted to both bearing portions 13a and 14a of the front head 13 and the rear head 14. Insertion is supported. As a rotary compressor which consists of such a structure, what is published by the following patent document 1 is mentioned.

<Fixing the rear muffler 17 to the rear head 14>
Here, with reference to FIG. 4, the fixing structure to the rear head 14 of the rear muffler 17 is demonstrated. FIG. 4 is a partial enlarged cross-sectional view showing a structure for fixing the rear muffler 17 to the rear head 14. The rear head 14 includes the above-described bearing portion 14a and a closing plate 14b extending outward from the bearing portion 14a.

  The rear muffler 17 is formed by pressing an elastic plate member such as a steel plate and has a bowl shape as a whole. A circular opening 17 h for projecting the lower end of the crankshaft 26 into the oil sump 9 is provided at the top of the rear muffler 17. Around the opening 17h, a convex portion 17a protruding toward the bearing portion 14a is provided. Further, a stepped flange 17b that holds the side end face of the closing plate 14b is formed on the peripheral portion of the rear muffler 17.

  The rear muffler 17 is fixed to the rear head 14 by attaching the rear muffler 17 to the rear head 14 so as to generate an elastic force between the convex portion 17a and the flange 17b, so that the convex portion 17a is directed toward the bearing portion 14a. A force (direction indicated by an arrow in the figure) is generated. Based on this urging force, the rear muffler 17 is sealed and fixed to the rear head 14 between the bearing portion 14a and the side end face of the closing plate 14b.

However, it is conceivable that the face surface 14s of the rear head 14 is distorted (a state indicated by a two-dot chain line in the drawing) due to the force from the convex portion 17a of the rear muffler 17 toward the bearing portion 14a. As a result, unevenness in the level difference between the roller 19b and the cylinder 12b and nonuniformity in the gap occur, and there is a concern that the performance of the rotary compressor will deteriorate.
Japanese Patent Application Laid-Open No. 2004-324652

  The problem to be solved by the present invention is that when the rear muffler is fixed to the rear head, the performance of the rotary compressor may be deteriorated due to distortion of the face surface of the rear muffler due to the biasing force of the rear muffler. . Accordingly, the present invention has been made to solve the above-described problems, and provides a rotary compressor that employs a structure for fixing the rear muffler to the rear head, which can suppress distortion of the face surface of the rear muffler. There is to do.

  In one aspect of the rotary compressor according to the present invention, a crankshaft, a roller disposed on the outer periphery of the eccentric portion of the crankshaft, a cylinder defining a cylinder chamber in which the roller is disposed, and the crankshaft It has a bearing portion for supporting the shaft, and includes a front head and a rear head that sandwich the cylinder and the roller from the axial direction side of the crankshaft.

  The rear head includes a bearing portion, a closing plate extending outward from the bearing portion, and a discharge port provided in the closing plate. The rear head includes a gap between the bearing portion and the closing plate. Is held on the basis of elastic force so that a rear muffler fixed to the rear head is attached so as to cover the rear head and the discharge port, and the bearing portion side of the rear muffler is located at the axial front end surface of the bearing portion. Abutting over the entire circumference, the closing plate side of the rear muffler abuts over the entire circumference at the peripheral edge portion of the closing plate, and the bearing portion is provided with a recess from the outer peripheral side surface toward the crankshaft side.

  In another aspect of the rotary compressor according to the present invention, a crankshaft, a roller disposed on the outer periphery of the eccentric portion of the crankshaft, a cylinder defining a cylinder chamber in which the roller is disposed, and the above It has a bearing portion for supporting the crankshaft, and includes a front head and a rear head that sandwich the cylinder and the roller from the axial direction side of the crankshaft.

  The rear head includes a bearing portion, a closing plate extending outward from the bearing portion, and a discharge port provided in the closing plate. The rear head includes a gap between the bearing portion and the closing plate. Is held on the basis of the elastic force, and a rear muffler fixed to the rear head is attached so as to cover the rear head and the discharge port, and the bearing portion side of the rear muffler is completely moved from the outer peripheral side of the bearing portion. Abutting over the circumference, the closure plate side of the rear muffler abuts over the entire circumference at the peripheral edge of the closure plate.

  According to the rotary compressor based on the present invention, the bearing portion of the rear head is provided with the concave portion from the outer surface of the side portion toward the crankshaft side. As a result, even if the bearing portion side of the rear muffler abuts over the entire circumference on the axial front end surface of the bearing portion of the rear head and an urging force from the rear muffler toward the bearing portion is applied, the rear muffler is provided on the bearing portion of the rear head. Stress concentration occurs in the recessed portion, and this recessed region is deformed. As a result, it is possible to suppress the occurrence of distortion on the face surface of the rear head. As a result, the rear muffler suppresses the occurrence of uneven steps and gaps between the roller and the cylinder while ensuring the sealing performance between the bearing portion and the side end surface of the closing plate with respect to the rear head. The performance of the rotary compressor can be maintained.

  According to another aspect of the rotary compressor based on the present invention, the bearing portion side of the rear muffler is in contact with the entire circumference from the outer peripheral side surface side of the bearing portion of the rear head. Thereby, the direction of the urging force applied to the bearing portion from the rear muffler is a direction that intersects the axial direction of the crankshaft. Since the direction in which this urging force acts is not the direction toward the face surface side of the rear head, it is possible to suppress the occurrence of distortion on the face surface of the rear head. As a result, the rear muffler suppresses the occurrence of uneven steps and gaps between the roller and the cylinder while ensuring the sealing performance between the bearing portion and the side end surface of the closing plate with respect to the rear head. The performance of the rotary compressor can be maintained.

  Hereinafter, embodiments of a rotary compressor according to the present invention will be described with reference to FIGS. 1 and 2. The basic configuration of the rotary compressor in the present embodiment is the same as the structure of the rotary compressor described with reference to FIG. 3, and the outer periphery of the crankshaft 26 and the eccentric portions 20a and 20b of the crankshaft 26. Rollers 19a and 19b, cylinders 12a and 12b defining cylinder chambers 11a and 11b in which the rollers 19a and 19b are disposed, a middle plate 18 disposed between the cylinders 12a and 12b, and a crankshaft 26 The front head 13 and the rear head 14A (first embodiment) and 14B (first embodiment) sandwiching the cylinders 12a and 12b and the rollers 19a and 19b from the axial direction side of the crankshaft 26 are provided. Embodiment 2) is a rotary compressor.

  Therefore, in the following description, the same or corresponding parts as those of the structure of the rotary compressor described with reference to FIG. 3 are denoted by the same reference numerals, and redundant description may not be repeated. Only the components will be described in detail below.

(Embodiment 1)
First, with reference to FIG. 1, the characteristic part of the rotary compressor in Embodiment 1 is demonstrated. FIG. 1 is a partially enlarged cross-sectional view showing a structure for fixing the rear muffler 17A employed in the rotary compressor in the present embodiment to the rear head 14B.

  The rear head 14A in the present embodiment includes a rear muffler 17A that is fixed to the rear head 14A so as to cover the rear head 14A and the discharge port 14c by holding the space between the bearing portion 14a and the closing plate 14b based on elastic force. Installed.

  In the rear muffler 17A, an elastic plate member such as a steel plate is formed by press working, and has a bowl shape as a whole. A circular opening 17h is provided at the top of the rear muffler 17A so that the lower end of the crankshaft projects into the oil sump. Around the opening 17h on the bearing portion side 17a of the rear muffler 17A, a convex portion 17a that protrudes toward the bearing portion 14a is provided so as to be in contact with the entire circumference of the axial front end surface 14d of the bearing portion 14a. Further, a stepped flange 17b holding the side end face of the closing plate 14b is formed on the peripheral portion of the rear muffler 17A.

  Further, the bearing portion 14a of the rear head 14A is provided with a recess 14f from the outer peripheral side surface 14e toward the crankshaft. In the present embodiment, the recess 14f is provided in an annular shape over the entire circumference on the outer peripheral side surface 14e of the bearing portion 14a.

  As described above, according to the rotary compressor in the present embodiment, the bearing portion 14a of the rear head 14A is provided with the concave portion 14f from the side outer surface toward the crankshaft side. As a result, the bearing portion 17a side of the rear muffler 17A abuts over the entire circumference at the axial front end surface 14d of the bearing portion 14a of the rear head 14A, and a biasing force (pressing force) from the rear muffler 17A toward the bearing portion 14a is applied. Even in this case, stress concentration occurs in the concave portion 14f provided in the bearing portion 14a of the rear head 14A, and the region of the concave portion 14f is deformed. As a result, it is possible to suppress the occurrence of distortion on the face surface 14s of the rear head 14A. As a result, the rear muffler 17A has a non-uniform step difference between the rollers 19a and 19b and the cylinders 12a and 12b while ensuring a sealing property with respect to the rear head 14A between the bearing portion 14a and the side end face of the closing plate 14b. It is possible to maintain the performance of the rotary compressor by suppressing the occurrence of non-uniform gaps.

  In FIG. 1, the concave portion 14f is described as being provided in an annular shape over the entire circumference on the outer peripheral side surface 14e of the bearing portion 14a, but the force to be absorbed (the biasing force from the rear muffler 17A toward the bearing portion 14a side) ) Is small, it is also possible to provide a concave part instead of a continuous ring. When the force to be absorbed is large, not only one annular recess but also a plurality of annular recesses along the axial direction of the bearing portion 14a, or a combination of an annular recess and a partial recess is employed. It is also possible.

(Embodiment 2)
Next, with reference to FIG. 2, the characteristic part of the rotary compressor in Embodiment 2 is demonstrated. FIG. 2 is a partially enlarged cross-sectional view showing a structure for fixing the rear muffler 17B employed in the rotary compressor in the present embodiment to the rear head 14B.

  As in the first embodiment, the rear head 14B according to the present embodiment is configured to cover the rear head 14 and the discharge port 14c by holding the bearing portion 14a and the closing plate 14b based on elastic force. A rear muffler 17B fixed to the rear head 14B is attached.

  Similarly to the rear muffler 17A, the rear muffler 17B is formed by pressing an elastic plate member such as a steel plate, and has a bowl shape as a whole. A circular opening 17h is provided at the top of the rear muffler 17B so that the lower end of the crankshaft protrudes into the oil sump. Around the opening 17h on the bearing portion side of the rear muffler 17, since it abuts over the entire circumference from the outer peripheral side surface 14e side of the bearing portion 14a, a convex portion that protrudes in a direction intersecting the axial direction of the bearing portion 14a 17a is provided. Further, a stepped flange 17b holding the side end face of the closing plate 14b is formed on the peripheral portion of the rear muffler 17B.

  As described above, according to the rotary compressor in the present embodiment, the convex portion 17a that protrudes in the direction intersecting the axial direction of the bearing portion 14a is provided on the bearing portion side of the rear muffler 17B. 17a is contact | abutting over the perimeter from the outer peripheral side surface side of the bearing part 14a of the rear head 14B. Thereby, the direction of the urging force applied to the bearing portion 14a of the rear muffler 17B is a direction intersecting the axial direction of the crankshaft.

  Since the direction in which the urging force acts is not the direction toward the face surface 14s of the rear head 14B, it is possible to suppress the occurrence of distortion on the face surface 14s of the rear head 14B. As a result, the rear muffler 17B has a non-uniform step difference between the rollers 19a and 19b and the cylinders 12a and 12b while ensuring sealing performance between the bearing portion 14a and the side end surface of the closing plate 14b with respect to the rear head 14B. It is possible to maintain the performance of the rotary compressor by suppressing the occurrence of non-uniform gaps.

  As mentioned above, the said embodiment disclosed this time is an illustration in all the points, Comprising: It is not restrictive. The technical scope of the present invention is defined by the terms of the claims, and is intended to include any modifications within the scope and meaning equivalent to the terms of the claims.

It is a partial expanded sectional view which shows the fixing structure to the rear head of the rear muffler employ | adopted for the rotary compressor in Embodiment 1 based on this invention. It is a partial expanded sectional view which shows the fixation structure to the rear head of the rear muffler employ | adopted for the rotary compressor in Embodiment 2 based on this invention. It is a longitudinal cross-sectional view which shows the whole structure of the rotary compressor in background art. It is a partial expanded sectional view which shows the fixation structure to the rear head of the rear muffler of the rotary compressor in background art.

Explanation of symbols

  1 casing, 2 intermediate cylinder, 4 lower lid, 5a, 5b suction pipe, 7 compression element, 8 drive element, 9 oil reservoir, 10 storage space, 11a, 11b cylinder chamber, 12a, 12b cylinder, 13 front head, 13a, 14a Bearing portion, 13c Discharge port, 14A, 14B Rear head, 14b Blocking plate, 14c Discharge port, 14f Recessed portion, 14s Face surface, 15 Through bolt, 16 Front muffler, 17A, 17B Rear muffler, 17a Convex portion, 17b Flange, 18 Middle plate, 19a, 19b Roller, 20a, 20b Eccentric part, 24 Stator, 25 Rotor, 26 Crankshaft.

Claims (3)

Crankshaft (26), rollers (19a, 19b) disposed on the outer periphery of eccentric portions (20a, 20b) of the crankshaft (26), and cylinder chambers (11a, 19b) in which the rollers (19a, 19b) are disposed 11b) and cylinders (12a, 12b), and bearing portions for supporting the crankshaft (26), and the cylinders (12a, 12b) and the crankshaft (26) from the axial direction side A rotary compressor comprising a front head (13) and a rear head (14) sandwiching the rollers (19a, 19b),
The rear head (14) includes a bearing portion (14a), a closing plate (14b) extending outward from the bearing portion (14a), and a discharge port (14c) provided in the closing plate (14b). ,
The rear head (14) is configured to cover the rear head (14) and the discharge port (14c) by holding between the bearing portion (14a) and the closing plate (14b) based on elastic force. A rear muffler (17) fixed to the rear head (14) is attached,
The bearing portion side (14a) of the rear muffler (17) abuts over the entire circumference at the axial front end surface (14d) of the bearing portion (14a), and the closing plate side (14b) of the rear muffler (17) Abutting over the entire circumference at the peripheral edge of the closing plate (14b),
The rotary compressor, wherein the bearing (14a) is provided with a recess (14f) from the outer peripheral side surface (14e) toward the crankshaft (26).   2. The rotary compressor according to claim 1, wherein the concave portion (14 f) is provided in an annular shape over the entire circumference on the outer side surface of the bearing portion (14 a). Crankshaft (26), rollers (19a, 19b) disposed on the outer periphery of eccentric portions (20a, 20b) of the crankshaft (26), and cylinder chambers (11a, 19b) in which the rollers (19a, 19b) are disposed 11b) and cylinders (12a, 12b), and bearing portions for supporting the crankshaft (26), and the cylinders (12a, 12b) and the crankshaft (26) from the axial direction side A rotary compressor comprising a front head (13) and a rear head (14) sandwiching the rollers (19a, 19b),
The rear head (14) includes a bearing portion (14a), a closing plate (14b) extending outward from the bearing portion (14a), and a discharge port (14c) provided in the closing plate (14b). ,
The rear head (14) is configured to cover the rear head (14) and the discharge port (14c) by holding the bearing portion (14a) and the closing plate (14b) based on elastic force. A rear muffler (17) fixed to the rear head (14) is attached,
The bearing portion side (14a) of the rear muffler (17) is in contact with the entire circumference on the outer peripheral side surface (14e) side of the bearing portion (14a), and the closing plate side (14b) of the rear muffler (17) is A rotary compressor that makes contact with the entire periphery of the peripheral edge of the closing plate (14b).

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