JPH0680886U - Scroll compressor - Google Patents

Abstract

(57) [Abstract] [Purpose] To obtain a scroll compressor including a scroll that does not cause pressure leakage. A fixed scroll in which a spiral wrap 3b is erected on an end plate 3a and an orbiting scroll in which a spiral wrap 4b is erected on an end plate 4a are eccentrically opposed to each other by engaging the wraps. The wraps 3b and 4b are each provided with a groove 12 at the front end thereof and a spring 14 having a cut-and-raised piece provided with a flat surface portion 14a on the front and back sides thereof and a tip seal 13.
The chip seal 13 is pressed against the facing end plate by.

Description

[Detailed description of the device]

[0001]

[Industrial applications]

 The present invention relates to a scroll compressor, and more particularly to a seal structure.

[0002]

[Prior art]

 As a scroll compressor of this type according to the conventional example, there is a compressor of a gas body such as Freon shown in FIG. In the figure, in a closed container 1 having a high-pressure chamber 2 inside, a fixed scroll 3 having a spiral wrap 3b standing on a mirror plate 3a and a discharge hole 3c formed substantially at the center is fixed. Similarly, a spiral wrap 4b is provided upright on one surface of the end plate 4a, and a swivel scroll 4 provided with a swivel scroll shaft 4c on the other surface is eccentrically arranged by engaging the wraps, and between the both laps. A suction chamber 6 and a discharge chamber 7 are provided at the outer periphery and the center of the compression chamber 5 formed, respectively. On the other hand, a drive bearing 9 is provided at the center of the frame 8 which is located below the orbiting scroll 4 and receives its thrust load and which is fixed to the fixed scroll 3 at the outer peripheral portion, and is supported by the coaxial bearing 9. An eccentric bearing 11 is provided at the upper end of a crankshaft 10 driven by a motor not provided, and the orbiting scroll shaft 4c is inserted in the bearing 11. FIG. 3 is a cross-sectional view of the main part. In order to seal between the tip of the wrap and the end plate facing it, a groove 12 is provided in the wrap 4b of the orbiting scroll 4 as shown in FIG. 3 (A). The tip seal 13 is accommodated in the spring 12 via the spring 14, and the elasticity of the tip seal 13 presses the tip seal 13 against the end plate 3a. This spring 14 is formed by disposing a plurality of cut-and-raised pieces on the center line of a spiral elastic plate material with reference to FIG. 3 (B) which is a longitudinal sectional view. It is located on the side. The tip of the wrap 3b of the fixed scroll 3 is also constructed in the same manner, but in this case, the cut-and-raised pieces of the spring 14 are cut and raised in opposite directions. In order to prevent the spring 14 from becoming two types, there is JP-A-3-149358 in which the spring 14 and the spring 14 are commonly used. According to this, as shown in FIGS. Is located on the side of the tip seal 13. However, since the tip seal 13 and the wraps 3b and 4b have different mechanical strengths, there is a difference in the deformation due to the cut-and-raised pieces, and during long-term operation, pressure leakage occurs from the side with a large amount of deformation and compression efficiency is reduced. There are drawbacks.

[0003]

[Problems to be solved by the device]

 The present invention has been made in view of the problems of the above-described conventional example, and an object thereof is to provide a compressor that does not leak pressure between scrolls by using a common spring.

[0004]

[Means for Solving the Problems]

 In order to solve the above-mentioned problems, in the present invention, a fixed scroll in which a spiral wrap is erected on a mirror plate is fixed in an airtight container whose inside is a high-pressure chamber, and a spiral wrap is also provided on one surface of the mirror plate. And the orbiting scroll with the orbiting scroll shaft on the other side are eccentrically opposed to each other by engaging the wraps, and the tip seals are housed in the grooves provided at the ends of both wraps via the same kind of springs. In the scroll compressor described above, the spring comprises a plurality of cut-and-raised pieces of the same shape on both sides of the plate material, and the cut-and-raised pieces have a flat surface portion substantially parallel to the plate material.

[0005]

[Action]

 Eliminates pressure leakage between scrolls during long-term operation.

[0006]

【Example】

 An embodiment of the compressor according to the present invention will be described below with reference to FIGS. FIG. 1 is a partial cross-sectional view of this machine, in which a fixed scroll 3 in which a spiral wrap 3b is erected on an end plate 3a is fixed in an airtight container 1 having a high-pressure chamber 2 inside. A spiral wrap 4b is erected on one surface of the wrap, and an orbiting scroll 4 having an orbiting scroll shaft 4c on the other surface is eccentrically opposed by engaging the wraps with each other. A suction chamber 6 and a discharge chamber 7 are provided at the outer periphery and the center of the chamber 5, respectively, a suction pipe 6a is connected to the suction chamber 6, and a discharge hole 3c is bored at substantially the center of the fixed scroll 3 so that the discharge chamber 7 has a high pressure. A discharge pipe 1 a is provided in the closed container 1 so as to communicate with the chamber 2, and a flow path from the suction pipe 6 a to the discharge pipe via the suction chamber 6, the compression chamber 5, the discharge chamber 7, and the high pressure chamber 2 is provided. Form. On the other hand, a drive bearing 9 is provided in the center of a frame 8 fixed to the fixed scroll 3 at the outer peripheral portion thereof, which is positioned below the orbiting scroll 4 and receives the thrust load, and is supported by the bearing 9. An eccentric bearing 11 is provided at the upper end of a crankshaft 10 driven by a motor not mounted, and the orbiting scroll shaft 4c is inserted therein. An Oldham ring (not shown) is disposed between the frame 8 and the end plate 4a of the orbiting scroll 4. FIG. 2 is a cross-sectional view of the main part of FIG. 1. In order to seal the gap between the tip of the wrap and the end plate facing it, a groove 12 is provided in the wrap 4b of the orbiting scroll 4 in FIG. The chip seal 13 is housed in the groove 12 via the spring 14, and the elasticity of the spring 14 presses the chip seal 13 against the end plate 3a. Referring to FIG. 2B, which is a longitudinal sectional view, the spring 14 has cut-and-raised pieces of the same shape having flat portions 14a substantially parallel to the material on the center line of the spiral elastic material, which are alternately arranged on the front and back sides. It is formed by arranging more than one. 2C and 2D show an example in which the same spring 14 is used for the wrap 3b of the fixed scroll 3.

Next, the operation of this compressor will be described. Due to the rotation of the crankshaft 10 that is driven integrally with the rotating shaft of the motor (not shown), the orbiting scroll shaft 4c, which is eccentrically supported, turns in a circle having a radius of this eccentric distance. The orbiting scroll 4 is restricted by an Oldham ring (not shown) so that the orbiting scroll 4 orbits with respect to the fixed scroll 3 so as not to rotate apparently, and one point of each circle forming a wrap is almost always in contact with the fixed scroll 3. While doing so, a turning motion is performed, and the contact point is continuously moved from the outer circumference to the center. As a result, the gas flowing between the scrolls from the suction pipe 6a through the suction chamber 6 is collected between the wraps of almost the outermost circumference, and the space volume is reduced as it is sent to the center by the rotation, so that it is compressed. It is turned into high-pressure gas, enters the high-pressure chamber 2 through the discharge port 3c, and is supplied to an external device through the discharge pipe. Since the tip seal 13 is interposed between the sliding portion of the orbiting scroll 4 and the fixed scroll 3, that is, between the end plate and the wrap, pressure leakage does not occur, and the spring 14 pressing the tip seal 13 has the same shape on the front and back sides. Even if it is shared by both laps, the pressing by the standing piece or the deformation and permanent deformation of the tip seal 13 are the same, so there is no difference between both sliding parts even after long-term operation, and therefore there is no pressure leakage. Therefore, the compression efficiency is kept high.

[0008]

[Effect of device]

 As described above, between the sliding portion of the orbiting scroll 4 and the fixed scroll 3, that is, between the end plate and the wrap, the tip seal 13 pressed by the spring 14 is provided in the groove provided in each wrap to prevent pressure leakage. Since the compression efficiency is kept high and the same type of spring 14 is used for both wraps, the parts are inexpensive and the assembly work is simple. Since there is no difference and pressure leakage does not occur, high compression efficiency is maintained, and since the flat surface is provided on the upright piece to increase the contact surface, deformation and wear of the contacted part are reduced. It is possible to obtain an excellent effect of obtaining a compressor having a long life.

[Brief description of drawings]

FIG. 1 is a partial cross-sectional view of a scroll compressor according to the present invention and a conventional example.

2A, 2B, 2C, and 2D are cross-sectional views of a main part of a scroll compressor according to the present invention.

3 (A), (B), (C) and (D) are cross-sectional views of a main part of a conventional scroll compressor.

[Explanation of symbols]

 1 Airtight container 2 High pressure chamber 3 Fixed scroll 3a End plate 3b Wrap 4 Orbiting scroll 4a End plate 4b Wrap 4c Orbiting scroll shaft 12 Groove 13 Tip seal 14 Spring 14a Plane part

Claims (2)

[Scope of utility model registration request] 1. A fixed scroll in which a spiral wrap is erected on an end plate is fixed in a closed container having a high pressure chamber inside,
Similarly, a spiral wrap is erected on one surface of the end plate and an orbiting scroll having an orbiting scroll shaft on the other surface is made to eccentrically face each other by engaging the wraps, and the same type of groove is provided in each of the above-mentioned wraps. A scroll compressor in which a tip seal is housed via a spring, wherein the spring comprises a plurality of cut-and-raised pieces of the same shape on both sides of a plate material. 2. The scroll compressor according to claim 1, wherein the cut-and-raised piece of the spring has a flat surface portion substantially parallel to the plate material.