JPH05133352A - Scroll compressor - Google Patents

Abstract

(57) [Summary] [Object] An object of the present invention is to install a discharge valve in a scroll compressor to eliminate an insufficient compression phenomenon and at the same time to reduce an impact sound generated by opening and closing the discharge valve. .. [Arrangement] By arranging the discharge valve 221 so that the discharge port 112 of the fixed scroll 11 is located near the center in the longitudinal direction of the discharge valve 221, only the vicinity of the discharge port 112 of the discharge valve 221 is discharged at the time of discharging the compressed fluid. Fixed scroll 1
The valve is opened in such a shape as to be separated from 1, and the tip of the discharge valve 221 on the side opposite to the side fixed to the fixed scroll 11 is in constant contact with the fixed scroll 11.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a scroll compressor.

[0002]

2. Description of the Related Art The principle of a scroll compressor will be described with reference to the drawings.

In FIG. 5, a fixed scroll having a spiral blade 2 and a revolving scroll having a spiral blade 1 which is substantially symmetrical to the spiral blade 2 of the fixed scroll 18
A plurality of compression work spaces 3 which are bilaterally symmetrical in the radial direction are formed at the same time by engaging with each other by shifting them by 0 degree. Here, when the orbiting scroll is orbited about the point O with the orbiting radius r with respect to the fixed scroll, the volume of the compression work space 3 continuously decreases. The orbiting scroll has its rotation restrained by a rotation restraining component (not shown). As a result, as shown by the mesh portion in FIG. 5 (a), the fluid taken in at the radially outer peripheral portion of the spiral blade moves toward the central portion as the volume of the compression work space 3 continuously decreases. Be compressed. 5 (b) is shown in FIG. 5 (a).
The state in which the orbiting scroll has turned 90 degrees from FIG. 5C.
Shows a state of being turned by 90 degrees from FIG. 5 (b). Then, when it is further swung by approximately 90 degrees, as shown in FIG. 5D, the symmetrical work space 3 that is compressed to the vicinity of the central portion communicates with the discharge port 4 provided near the central portion of the fixed scroll. The compressed fluid is discharged. The pressure of the discharged fluid is determined by the pressure of the fluid taken in at the outer peripheral portion in the radial direction of the spiral blade, the number of turns of the spiral blade, and the specific heat ratio.

A scroll compressor is a type of positive displacement compressor that performs a compression operation based on the above principle.

In a scroll compressor based on such a principle, at the moment when a symmetrical working space, which is compressed to near the center, communicates with a discharge port provided near the center of the fixed scroll. The pressure in the compression work space may be lower than the discharge pressure. That is, there may be a case of insufficient compression. Therefore, a phenomenon occurs in which the fluid flows back from the discharge space into the communicating compression work space through the discharge port. When such a phenomenon occurs, there is a problem that pressure loss and energy loss occur, and the fluctuation of the discharge pressure increases.

In particular, in a relatively small scroll compressor whose size in the radial direction is limited, it is generally difficult to increase the number of spiral blades, and the number of spiral blades is smaller than that of middle and large scroll compressors. It is necessary to design as few as possible. Therefore, depending on the pressure condition, the above-mentioned insufficient compression state is likely to occur, resulting in a decrease in efficiency.

In order to solve the above problems, there is a means for providing a discharge valve at the discharge port portion of a fixed scroll, as disclosed in Japanese Patent Laid-Open No. 55-351151. A sectional view of an example of this means is shown in FIG. As a result, even in the case of insufficient compression as described above, the discharge valve 221 is closed when the pressure in the left-right symmetric compression work space after communicating with the discharge port 112 is equal to or lower than the discharge pressure, and is larger than the discharge pressure. Since the discharge valve is opened at the time, the phenomenon that the fluid flows backward into the communicating compression work space does not occur, and the problems such as pressure loss and energy loss do not occur.

[0008]

However, in the conventional discharge valve as described above, as shown in FIG. 6, one end of the discharge valve 221 is fixed to the fixed scroll 11, and the discharge port near the tip of the other end. It was supposed to open and close 112. Therefore, the discharge valve 221 opens and closes with the discharge of the compressed fluid, and at the moment of closing the valve, the tip of the discharge valve 221 vibrates the surface of the fixed scroll 11 on the discharge space 20 side, and at this moment a large impact noise is generated. However, the scroll compressor has a problem of impairing the inherent quietness of the scroll compressor.

The present invention solves the above-mentioned problems of the prior art by providing a discharge valve in a scroll compressor to eliminate the insufficient compression phenomenon and at the same time reduce the impact noise generated when the discharge valve is closed. It is an object of the present invention to provide an efficient and low noise scroll compressor.

[0010]

In order to solve the above-mentioned problems, according to the present invention, conventionally, the discharge port is arranged so as to be located near the tip on the side opposite to the side fixing the discharge valve in the longitudinal direction. The discharge valve is arranged so that the discharge port is located near the center in the longitudinal direction of the discharge valve.

Further, the discharge port is located near the center in the longitudinal direction of the discharge valve, and the discharge valve has a gap near the tip of the discharge valve opposite to the side fixed to the fixed scroll. It is what

Further, a valve retainer is arranged together with the discharge valve,
The opening amount of the discharge valve is limited, and the cross-sectional shape of the valve retainer is made substantially similar to the shape when the discharge valve is opened.

In addition to the above means, a part of the periphery of the discharge valve, which corresponds to the discharge port, is cut out so as to have a shape similar to or close to the discharge port.

[0014]

In the present invention, since the discharge valve is arranged so that the discharge port is located near the center in the longitudinal direction of the discharge valve, during normal operation, only the discharge valve near the discharge port is separated from the fixed scroll. The valve is opened in such a shape, and the tip of the discharge valve opposite to the side fixed to the fixed scroll is always in contact with the fixed scroll. Therefore, when the discharge valve is closed, the tip of the discharge valve does not vibrate the surface of the fixed scroll on the discharge space side, and almost no impact noise is generated.

Further, by disposing the valve retainer together with the discharge valve and making the cross-sectional shape of the valve retainer substantially similar to the shape when the discharge valve is opened, the valve opening amount of the discharge valve is limited and the discharge amount is reduced. It is possible to increase the reliability of the valve and further reduce the impact noise generated at the tip of the discharge valve when the discharge valve is closed.

Further, by cutting out a part of the periphery corresponding to the discharge port of the discharge valve so as to have a shape similar to or close to the shape of the discharge port, when the discharge valve opens, the discharge port moves to the discharge space. The compressed fluid easily flows out uniformly to the surroundings, and the fluid noise generated at this time can be reduced.

[0017]

DESCRIPTION OF THE PREFERRED EMBODIMENTS A scroll compressor according to an embodiment of the present invention will be described below with reference to the drawings.

In FIG. 1, the compression mechanism includes a spiral blade 11
1 is composed of a fixed scroll 11, a swirl scroll 10 in which spiral blades 101 are formed on a swirl end plate 102, and a rotation restraint component 12, and the fixed scroll 11 is fixed to a closed container 17 together with a bearing member 13. .. A shaft 103 is provided on the side of the orbiting end plate 102 of the orbiting scroll 10 opposite to the spiral blade 101, and the shaft 103 is rotatably supported by a bearing portion 131 of a bearing member 13 and a ball bearing bearing portion 15. 1
It is supported by an eccentric hole portion 141 formed at one end of No. 4. An electric motor 16 including a stator 161 fixed to the closed container 17 and a rotor 162 fixed to the main shaft 14 and rotatable with the main shaft is disposed between the bearings 131 and 15 of the main shaft 14.

Therefore, by driving the electric motor 16, the main shaft 14 rotates, and the eccentric hole portion 141 of the main shaft 14 performs eccentric rotary motion. As a result, the orbiting scroll 10 tries to perform a rotation movement, but since the rotation is restrained by the rotation restraint part 12, the spindle 14 and the orbiting scroll 1 are rotated.
A turning motion is performed with the distance between the axis and the shaft portion 103 of 0 being the radius. As a result, a plurality of bilaterally symmetrical compression working spaces 19 formed by engaging the spiral blades 111 of the fixed scroll 11 and the spiral blades 101 of the orbiting scroll 10 with each other shifted by 180 degrees are sucked from the suction pipe 18. The fluid is taken in through the suction port 113, and the compression work is continuously performed as the volume of the compression work space 19 decreases. Then, when compressed to near the center, the symmetric compression work space 19 communicates with the discharge port 112. When the pressure in the compression work space 19 at the moment of communication is higher than the pressure in the discharge space 20, the discharge valve 221 formed of an elastic plate opens to the discharge space 20 side so that the discharge port 112 and the discharge space 20 communicate with each other. Then, the compressed fluid is discharged.
If the pressure of the compression work space 19 at the moment of communication is equal to or lower than the pressure of the discharge space 20, the discharge valve 221 has not been opened yet, and the orbiting scroll 10 further orbits to compress the fluid, The discharge valve 221 opens only when the pressure in 19 becomes higher than the pressure in the discharge space 20. The discharged compressed fluid flows into the closed container through the communication hole 131 and is discharged from the discharge pipe 21 to the outside of the closed container 17.

The valve retainer 222 included in the valve device 22 regulates the valve opening height of the discharge valve 221. this is,
For example, when a liquid compression phenomenon occurs and the valve opening height of the discharge valve 221 becomes excessively large, it is possible to prevent the discharge valve 221 from being plastically deformed to be in a state where it is always open, or to discharge due to fatigue failure. This is for preventing the valve 221 from breaking. During liquid compression, the axial compliance mechanism 23 operates and the orbiting scroll 10 moves to the bearing member 13 side, so that the fixed scroll 11
An appropriate gap is formed at the tip of the spiral blade 111 to allow the liquid fluid to escape from the gap to avoid an abnormal rise in pressure. In addition, the discharge valve 221 and the valve retainer 222 are previously integrated by a rivet 224.

A back pressure divider band 24 is installed on the orbiting scroll 10 side of the bearing member, and the discharge pressure is on the center side of the back pressure divider band 24 of the orbiting end plate 102 and the suction pressure is on the outside. It works, and an appropriate thrust force works during normal operation.

Further, as another embodiment of the present invention, as shown in FIG. 2, the vicinity of the tip of the discharge valve 221 on the side opposite to the side fixed to the fixed scroll 11 is previously fixed.
It may be shaped so as to have an appropriate gap t with respect to 1.

As another embodiment, as shown in FIG. 3, a valve retainer 222 is arranged together with a discharge valve 221, and the valve retainer 22 is provided.
2 may have a sectional shape such that only the vicinity of the ejection port 112 is separated from the surface of the fixed scroll 11 on the ejection space 20 side. In this case, the distance between the tip of the valve retainer 222 and the surface of the fixed scroll 11 on the discharge space 20 side is slightly larger than the thickness of the discharge valve 221, and the tip of the discharge valve 221 slides in the longitudinal direction. You are free.

Further, in addition to the above-mentioned structure, as shown in FIG. 4, a part of the periphery of the discharge valve 221 which is in contact with the discharge port 112 may be cut out so as to have a shape similar to or close to the discharge port 112. good. FIG. 4A shows an embodiment in which the diameter of the discharge port is smaller than the width of the discharge valve, and FIG. 4B shows an embodiment in which the diameter of the discharge port is larger than the width of the discharge valve.

[0025]

As is apparent from the above description, the present invention has the following advantages.
Even if insufficient compression occurs, the discharge valve blocks backflow, and energy loss does not occur. Also, during normal operation, the valve is opened in such a shape that only the vicinity of the discharge port of the discharge valve is separated from the fixed scroll, and the tip of the discharge valve opposite to the side fixed to the fixed scroll is always fixed scroll. Since they are in contact with each other, when the discharge valve is closed, the discharge valve tip does not vibrate the surface of the fixed scroll on the discharge space side, and almost no impact noise is generated.

Further, by installing the valve retainer together with the discharge valve, the valve opening height is regulated by the valve retainer even if the discharge valve opens abnormally, so that the reliability of the valve device can be enhanced. ..

As described above, according to the present invention, it is possible to obtain a scroll compressor having a high efficiency and a low noise, which can prevent the backflow of the discharge fluid and can suppress the noise generated in the discharge valve to be small.

[Brief description of drawings]

FIG. 1 is a sectional view of a scroll compressor according to an embodiment of the present invention.

FIG. 2 is a sectional view of a valve device of a scroll compressor according to another embodiment of the present invention.

FIG. 3 is a sectional view of the same.

FIG. 4A is a plan view of a discharge valve of a scroll compressor according to another embodiment of the present invention, and FIG. 4B is the same plan view.

FIG. 5A is a cross-sectional view showing a state in which the orbiting scroll of the scroll compressor has an orbiting angle of 0 degree (suction completion). FIG. 5B shows a state in which the orbiting scroll of the scroll compressor has an orbiting angle of 90 degrees. Sectional view (c) is a sectional view showing a state where the orbiting scroll of the scroll compressor has an orbiting angle of 180 degrees. (D) is a sectional view showing a state where the orbiting scroll of the scroll compressor has an orbiting angle of 270 degrees.

FIG. 6A is a cross-sectional view of a valve device in a conventional scroll compressor, and FIG. 6B is a plan view of the valve.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 10 Orbiting scroll 101 Vortex blade of orbiting scroll 102 Orbiting end plate 11 Fixed scroll 111 Vortex blade of fixed scroll 112 Discharge port 113 Suction port 12 Rotation restraint part 13 Bearing member 14 Spindle 19 Compression work space 20 Discharge space 22 Valve device 221 Discharge valve 222 Valve retainer 223 Bolt for fixing valve device

 ─────────────────────────────────────────────────── ─── Continuation of the front page (72) Inventor Masahiro Tsubokawa 1006 Kadoma, Kadoma City, Osaka Prefecture Matsushita Electric Industrial Co., Ltd. (72) Innovative Yoshinobu Kojima 1006 Kadoma, Kadoma City, Osaka Matsushita Electric Industrial Co., Ltd. (72) Inventor Michio Yamamura, 1006 Kadoma, Kadoma, Osaka Prefecture, Matsushita Electric Industrial Co., Ltd. (72) Yasuto Mukai, 1006, Kadoma, Kadoma, Osaka Prefecture, Matsushita Electric Industrial Co., Ltd. (72) Inventor, Kiyoshi Sawai 1006 Kadoma, Kadoma, Osaka Prefecture Matsushita Electric Industrial Co., Ltd. (72) Inventor, Shuichi Yamamoto 1006 Kadoma, Kadoma City, Osaka Prefecture (72) Inventor, Shotaro Ito 1006 Kadoma, Kadoma, Osaka Prefecture Matsushita Electric Industrial Co., Ltd.

Claims (4)

[Claims] 1. A fixed scroll having a swirl vane as a compression mechanism, and a swirl scroll having swirl vanes formed on a swivel end plate so as to mesh with the fixed scroll to form a plurality of compression work spaces. By configuring with a rotation restraint component for restraining the rotation of the orbiting scroll to perform a orbiting motion, the fluid taken in by the radially outer peripheral portion of the spiral vane is continuously centered in the compression work space. In a scroll compressor that is compressed to discharge the compressed fluid from a discharge port provided near the center of the fixed scroll, the discharge valve longitudinal direction so that the discharge port is opened and closed in the discharge port portion. A discharge valve composed of an elastic plate having one end fixed to the fixed scroll is arranged,
A scroll compressor in which a discharge valve is arranged such that the discharge port portion is located near the center in the longitudinal direction of the discharge valve. 2. The scroll compressor according to claim 1, further comprising a discharge valve having a shape such that a tip end of the discharge valve on the side opposite to the side fixed to the fixed scroll has a gap with the fixed scroll in advance. 3. A discharge valve and a valve retainer for restricting the valve opening height of the discharge valve are arranged, and the valve retainer has a sectional shape such that only the vicinity of the discharge port is separated from the fixed scroll. 1. The scroll compressor according to 1. 4. The scroll compressor according to claim 1, further comprising a discharge valve in which a peripheral portion corresponding to the discharge port of the discharge valve is cut out in a shape similar to or close to the shape of the discharge port.