JPH07189938A - Scroll compressor - Google Patents

Abstract

PURPOSE:To provide a scroll compressor of high efficiency and low noise by disposing a discharge valve in the scroll compressor so as to eliminate a back flow phenomenon of discharge fluid in the case of insufficient compression, reduce impact noise to be generated in closing a discharge valve, and restrain a discharge loss. CONSTITUTION:A scroll compressor is provided in a discharge unit with a discharge valve 221 made of an elastic plate fixed at one end thereof in the longitudinal direction to a fixed scroll 11 so as to open or close a discharge port 112 and a valve presser 222 for restricting a valve opening height of the discharge valve 221. The discharge valve 221 is formed into a shape with a clearance between the same and a surface where the discharge valve 221 of the fixed scroll 11 us previously fixed in the vicinity of the discharge port 112.

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 A scroll compressor includes a fixed scroll having spiral vanes and an orbiting scroll having spiral vanes substantially symmetrical with the spiral vanes of the fixed scroll.
By engaging in a state of being shifted by 80 degrees, a plurality of compression work spaces that are symmetrical in the radial direction are formed at the same time. Here, since the orbiting scroll has its rotation restrained by a rotation restraint component, when the orbiting scroll is orbited with a orbiting radius r with respect to the fixed scroll, the fluid taken in by the outer peripheral portion in the radial direction of the spiral blade is compressed. As the volume of the working space decreases continuously, it is compressed towards the center. When the orbiting motion continues, the symmetrical work space compressed to the vicinity of the central portion communicates with each other, and the compressed fluid is discharged from the discharge port provided near the central portion of the fixed scroll.

A scroll compressor is a kind of positive displacement compressor that performs a compression work based on the above-mentioned principle. The pressure of the fluid discharged is the pressure of the fluid taken in at the outer peripheral portion in the radial direction of the spiral blade and the pressure of the spiral blade. It is determined by the number of turns and the specific heat ratio.

By the way, in the scroll compressor based on the principle as described above, the symmetric compression work space compressed to the vicinity of the central portion is discharged at the moment when it communicates with the discharge port provided near the central portion of the fixed scroll. The pressure in the compression work space may be lower than the 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 medium 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 of the fixed scroll, as disclosed in Japanese Patent Laid-Open No. 55-35151. 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, which is higher 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 problems such as pressure loss and energy loss do not occur.

[0007]

However, in the conventional discharge valve as described above, when the rigidity of the discharge valve is weak,
When the compressed fluid is discharged to the discharge space, the projection valve lifts up greatly, and at the moment of closing, the discharge valve collides strongly with the surface of the fixed scroll on the discharge space side, and at this moment a large impact sound is generated and the scroll The compressor has a problem of impairing the inherent quietness of the compressor.

On the contrary, when the discharge valve has a high rigidity,
Since the discharge valve is hardly lifted up, the discharge process is not smoothly performed, and the pressure in the compression work space rises to a level considerably higher than the pressure in the discharge space. As a result, extra compression power is required, which causes a problem that a large discharge loss occurs.

The present invention solves the above-mentioned conventional problems by providing a discharge valve in a scroll compressor to eliminate the insufficient compression phenomenon and at the same time reduce the impact noise that occurs when the discharge valve is closed and discharge it. It is an object of the present invention to provide a scroll compressor that suppresses loss, is highly efficient, and has low noise.

[0010]

In order to solve the above problems, the present invention provides a discharge valve having a gap in advance near the discharge port from the surface fixing the discharge valve of the fixed scroll. .

Further, a valve retainer having a cross-sectional shape such that the tip of the valve comes into contact with the vicinity of the tip of the discharge valve is provided in advance.

[0012]

According to the present invention, since the discharge valve has a gap from the surface of the fixed scroll which fixes the discharge valve in the vicinity of the discharge port, the spring constant of the discharge valve is applied when the discharge valve is closed. Therefore, the speed at which the discharge valve closes is reduced. By this action, the contact surface of the fixed scroll is not strongly vibrated when the discharge valve is closed, and the impact noise is hardly generated. Also, when the discharge valve is concave with respect to the contact surface with the fixed scroll, the contact surface with the fixed scroll does not contact the contact surface with the fixed scroll when the discharge valve is closed, but rather from the fixed part. The above effect will be further enhanced by gradually contacting the fixed scroll. Further, when the discharge valve has a convex shape with respect to the contact surface with the fixed scroll, only the tip of the discharge valve first comes into contact with the fixed scroll when the discharge valve is closed,
At this time, the momentum of closing the discharge valve weakens. Next, due to the warped shape of the discharge valve, when the discharge valve is closed thereafter, the spring constant of the discharge valve is effective and the discharge valve is slowly closed.

Further, by disposing a valve retainer having a cross-sectional shape such that the tip of the valve comes into contact with the vicinity of the tip of the discharge valve in advance, the valve opening amount of the discharge valve is regulated and the impact force when the valve is closed is weakened. In addition, the reliability of the discharge valve can be increased at the same time.

[0014]

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
The fixed scroll 11 has a fixed scroll 11 having the structure 1, a swirl blade 101 is formed on a swirl end plate 102, and a rotation restraint component 12. 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. It is supported by an eccentric hole portion 141 formed at one end of 14. 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 arranged 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 motion, but since the rotation is restricted by the rotation constraint component 12, the main shaft 14 and the orbiting scroll 1 are rotated.
The turning motion is performed with the radius of the axis distance from the shaft portion 103 of 0. As a result, a plurality of bilaterally symmetrical compression working spaces 19 formed by meshing the spiral blades 111 of the fixed scroll 11 and the spiral blades 101 of the orbiting scroll 10 with each other by 180 ° 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 made 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 yet opened, and the orbiting scroll 10 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 port 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 is
The valve opening height of the discharge valve 221 is regulated. Also,
When the pressure in the compression work space 19 becomes abnormally high during liquid compression, the axial compliance mechanism 23
And the orbiting scroll 10 moves to the bearing member 13 side, whereby the spiral blade 11 of the fixed scroll 11 is moved.
(1) An appropriate gap is formed at the tip and the liquid is allowed to escape from it to avoid an abnormal rise in pressure.

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.

As another embodiment of the present invention, as shown in FIG. 2, the shape of the discharge valve 221 may be concave or convex with respect to the surface of the fixed scroll on which the discharge valve is fixed.

Further, in addition to the above-mentioned structure, as shown in FIG. 3, the shape of the discharge valve retainer 222 may be a cross-sectional shape such that the tip thereof contacts the vicinity of the tip of the discharge valve 221.

[0021]

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. In addition, since the discharge valve has a gap from the surface of the fixed scroll that fixes the discharge valve in the vicinity of the discharge port in advance, the spring constant of the discharge valve is applied when the discharge valve is closed, so the discharge valve closes. The speed is reduced. By this action, the contact surface of the fixed scroll is not strongly vibrated when the discharge valve is closed, almost no impact noise is generated, and the discharge valve floats near the discharge port. No discharge resistance occurs. Also, when the discharge valve is concave with respect to the contact surface with the fixed scroll, the contact surface with the fixed scroll does not contact the contact surface with the fixed scroll when the discharge valve is closed, but rather from the fixed part. The above effect will be further enhanced by gradually contacting the fixed scroll. When the discharge valve has a convex shape with respect to the contact surface with the fixed scroll, only the tip of the discharge valve comes into contact with the fixed scroll when the discharge valve is closed. Weakens. Next, due to the warped shape of the discharge valve, when the discharge valve is closed thereafter, the spring constant of the discharge valve is effective and the discharge valve is slowly closed. By this action, the contact surface of the fixed scroll is not strongly vibrated when the discharge valve is closed, and the impact noise is hardly generated.

Further, by disposing a valve retainer having a cross-sectional shape such that the tip of the valve retainer comes into contact with the vicinity of the tip of the discharge valve in advance, the valve opening amount of the discharge valve is regulated and the impact force at the time of closing the valve is controlled. Can be weakened and at the same time the reliability of the discharge valve can be increased.

As described above, according to the present invention, it is possible to provide a scroll compressor which prevents backflow of the discharge fluid, suppresses the noise generated in the discharge valve to be small, and has a small discharge resistance, high efficiency and low noise. it can.

[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 an enlarged sectional view of the valve device section.

FIG. 3 (a) is a cross-sectional view of a discharge valve of a scroll compressor when a concave discharge valve is used for a fixed scroll according to another embodiment of the present invention. (B) In another embodiment of the present invention. Sectional drawing of the discharge valve of a scroll compressor when a convex-shaped discharge valve is used with respect to a fixed scroll. (C) Scroll compression when the tip of a discharge valve is held down by the discharge valve holding in another Example of this invention. View of discharge valve of machine

FIG. 4A is a cross-sectional view of a valve device in a conventional scroll compressor, and FIG. 4B is a plan view of the valve.

[Explanation of symbols]

 10 orbiting scroll 11 fixed scroll 13 bearing member 14 main shaft 19 compression work space 20 discharge space 22 valve device 101 swirl vane of orbiting scroll 102 swirl end plate 111 swirl vane of fixed scroll 221 discharge valve 222 valve retainer 223 valve device fixing bolt

 ─────────────────────────────────────────────────── ─── Continuation of the front page (72) Inventor Sadao Kawahara 1006 Kadoma, Kadoma, Osaka Prefecture Matsushita Electric Industrial Co., Ltd. (72) Teruyuki Akasazawa 1006 Kadoma, Kadoma City, Osaka Matsushita Electric Industrial Co., Ltd. 72) Inventor Kiyoshi Sano 1006 Kadoma, Kadoma, Osaka Prefecture Matsushita Electric Industrial Co., Ltd. (72) Takashi Morimoto, 1006 Kadoma, Kadoma City, Osaka Matsushita Electric Industrial Co., Ltd.

Claims (2)

[Claims] 1. A compression mechanism comprising: a fixed scroll having spiral vanes; a swirl scroll having swirl vanes formed on a swirl end plate so as to mesh with the fixed scroll to form a plurality of compression work spaces; It is composed of a rotation restraint component for restraining the rotation of the orbiting scroll to cause a orbiting motion, and the fluid taken in by the radially outer peripheral portion of the spiral blade is continuously compressed in the compression work space toward the center, A compressed fluid is discharged from a discharge port provided near the center of the fixed scroll, and one end in the discharge valve longitudinal direction is fixed to the fixed scroll so as to open and close the discharge port to the discharge portion from an elastic plate. Disposing a discharge valve and a valve retainer for regulating the opening height of the discharge valve,
A scroll compressor, wherein the discharge valve has a shape having a gap near the discharge port in advance from the fixed surface of the discharge valve of the fixed scroll. 2. The scroll compressor according to claim 1, further comprising a valve retainer having a cross-sectional shape whose tip comes into contact with the vicinity of the tip of the discharge valve in advance.