JPH0625586U - Scroll compressor - Google Patents

Abstract

(57) [Abstract] [Purpose] To obtain a scroll compressor equipped with a scroll that does not wear or leak. [Structure] Inside a closed container 1 having a high-pressure chamber 2, an end plate 3
Fixed scroll 3 in which a spiral wrap 3b is erected on a
Is fixed, a spiral wrap 4b is erected on one of the end plates 4a, and the orbiting scroll 4 provided with the orbiting scroll shaft 4c on the other side is eccentrically made to face the wrap. A slide bush is arranged on the outer peripheral portions of the end plates 3a and 4a, and
Grooves 3d and 4d are provided at the tips of the wraps 3b and 4b, respectively, and the tip seal 13 is housed in the groove.

Description

[Detailed description of the device]

[0001]

[Industrial applications]

 The present invention relates to a scroll compressor, and more particularly to a scroll 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 the crankshaft 10 driven by a motor not provided, and the orbiting scroll shaft 4c is inserted into the coaxial shaft 11. FIG. 3 is an enlarged view of a main part. A fixed scroll 3 in which a wrap 3b is erected on an end plate 3a and a revolving scroll 4 in which a wrap 4b is erected on an end plate 4a are arranged by meshing the wraps. The tip ends of 4b are in contact with the mirror plates 4a and 3a, respectively, and the mirror plates 3a and 4a are in contact with each other on the outer circumference. However, in operation, the laps 3b and 4b are inclined and deformed due to the high pressure, which may cause the corners of the wrap tip to bite into the end plate to increase friction or cause the compressor to stop.

[0003]

[Problems to be solved by the device]

 The present invention has been made in view of the problems of the above-mentioned conventional example, and an object thereof is to provide a compressor with less friction between scrolls.

[0004]

[Means for Solving the Problems]

 In order to solve the above 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. In a scroll compressor in which an orbiting scroll having the orbiting scroll shaft provided on the other surface is eccentrically engaged by engaging the wraps, a sliding bush is provided between the end plates and a tip is attached to the wrap tip. It is characterized by having a seal.

[0005]

[Action]

 Friction between scrolls is reduced.

[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 1a is provided in the closed container 1 so as to communicate with the chamber 2, and a flow path from the suction pipe 6a 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. 2 is an enlarged view of a main part of FIG. 1. A fixed scroll 3 in which a wrap 3b is erected on an end plate 3a and an orbiting scroll 4 in which a wrap 4b is erected on an end plate 4a are arranged by meshing the wraps. A slidable bush 12 made of, for example, synthetic resin, graphite or the like having good slidability is arranged between the outer circumferences of the laps 4a and 4a. It is sealed between the housing and the facing end plate.

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. Even if the laps 3b and 4b are inclined and deformed by this high pressure, since the sliding bush 12 is arranged in the sliding portion on the outer periphery of the end plates 3a and 4a, there is a gap between the end plates 4a and 3a facing each other. It is prevented that they are engaged with each other, and the gap is sealed by the tip seal 12, so that no leakage occurs.

[0008]

[Effect of device]

 As described above, since the sliding bush 12 is provided and the gap is provided between the end plates 4a and 3a facing the laps 3b and 4b, and the gap is sealed by the tip seal 12, the meshing between the scrolls is prevented and the friction is prevented. It is possible to obtain an excellent effect that a compressor with high efficiency is obtained with less leakage.

[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.

FIG. 2 is a sectional view of a main part of a scroll compressor according to the present invention.

FIG. 3 is a cross-sectional view of a main part of a scroll compressor according to a conventional example.

[Explanation of symbols]

 1 Closed Container 2 High Pressure Chamber 3 Fixed Scroll 3a End Plate 3b Wrap 3d Groove 4 Orbiting Scroll 4a End Plate 4b Wrap 4c Orbiting Scroll Shaft 4d Groove 12 Sliding Bushing 13 Tip Seal

Claims (1)

[Scope of utility model registration request] 1. A fixed scroll in which a spiral wrap is erected on a mirror plate is fixed in a closed container having a high pressure chamber inside,
Similarly, in a scroll compressor in which a spiral wrap is erected on one surface of an end plate and an orbiting scroll having an orbiting scroll shaft on the other surface is eccentrically opposed by engaging the wrap, sliding between the end plates. A scroll compressor comprising a bush and a tip seal at the end of the wrap.