JP3265780B2 - Scroll compressor - Google Patents

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 a spiral blade and an orbiting scroll having a spiral blade substantially symmetric to the spiral blade of the fixed scroll.
A plurality of compression working spaces symmetrical in the radial direction are formed at the same time by engaging with each other while being shifted by 80 degrees. Here, since the rotation of the orbiting scroll is restricted by the rotation constraining component, when the orbiting scroll is orbited at the orbital radius r with respect to the fixed scroll, the fluid taken in at the outer peripheral portion in the radial direction of the spiral blade is compressed. As the volume of the workspace decreases continuously, it is compressed toward the center. When the orbiting motion continues, the left and right symmetrical compression work spaces compressed to the vicinity of the center communicate with each other, and the compressed fluid is discharged from the discharge port provided near the center of the fixed scroll.

A scroll compressor is a type of positive displacement compressor that performs a compression operation based on the above-described principle. The pressure of the discharged fluid depends on the pressure of the fluid taken in at the radially outer peripheral portion 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 such a principle, the symmetrical compression working space compressed to the vicinity of the center portion is discharged at the moment when it communicates with the discharge port provided near the center portion of the fixed scroll. The pressure in the compression working space may be lower than the pressure. That is, there is a case where the state is under-compressed. For this reason, a phenomenon occurs in which the fluid flows backward from the discharge space to the compressed working space that is communicated through the discharge port. When such a phenomenon occurs, there is a problem that a pressure loss and an energy loss occur, and the fluctuation of the discharge pressure increases.

In particular, it is generally difficult to increase the number of spiral blades in a relatively small scroll compressor whose size in the radial direction is limited, and the number of spiral blades is smaller than that in a medium or large scroll compressor. It is necessary to design as little as possible. Therefore, depending on the condition of the pressure, the above-described under-compression state is likely to occur, and the efficiency is reduced.

Therefore, in order to solve the above-mentioned problem, there is a means for providing a discharge valve at a discharge port portion of a fixed scroll as disclosed in, for example, JP-A-55-35151. FIG. 3 shows a sectional view of an example of this means. Thereby, even in the case of insufficient compression as described above, the discharge valve 221 is closed when the pressure in the symmetrical compression working space after communicating with the discharge port 112 is equal to or lower than the discharge pressure, and becomes larger than the discharge pressure. When the discharge valve opens, the phenomenon that the fluid flows backward in the communicating compression work space does not occur, and there is no problem such as pressure loss or energy loss.

[0007]

However, in the conventional discharge valve as described above, as shown in FIG.
One end of 21 is fixed to the fixed scroll 11, and the discharge port 112 is opened and closed near the tip of the other end. For this reason, due to the rigidity of the discharge valve, phenomena such as delay of opening of the discharge valve at the time of discharge, and insufficient protrusion of the protruding valve even at the time of valve opening occur. Therefore, the discharge process has not been performed smoothly. As a result, the pressure in the compression working space rises to a considerably higher level than the pressure in the discharge space 20, and there is a problem that extra compression power is required and a large discharge loss occurs.

In the case where the rigidity of the discharge valve is low, the protruding valve is greatly lifted when the compressed fluid is discharged into the discharge space, and when the valve closes, the discharge valve is placed on the surface of the fixed scroll on the discharge space side. There was a problem that a strong collision occurred, and a loud impact sound was generated at this moment, which impaired the inherent quietness of the scroll compressor.

The present invention solves the above-mentioned problems of the prior art, in which a discharge valve is provided in a scroll compressor to eliminate the under-compression phenomenon, and at the same time reduce the impact noise generated when the discharge valve is closed. An object of the present invention is to provide a scroll compressor with high efficiency and low noise that suppresses discharge loss.

[0010]

SUMMARY OF THE INVENTION In order to solve the above-mentioned problems, the present invention provides an entire discharge valve which can move between the valve holder and the fixed scroll in a direction perpendicular to the surface of the fixed scroll on the discharge space side. It is designed to be held as follows.

[0011]

According to the present invention, since the discharge valve is held so that the entire discharge valve can move between the valve holder and the fixed scroll in a direction perpendicular to the surface of the fixed scroll on the discharge space side, the discharge valve has an apparent appearance. Has a spring constant of 0, and can instantaneously react only to the pressure difference between the discharge port and the discharge space, so that the opening delay of the discharge valve is eliminated and a sufficient height can be ensured even when the valve is opened.

Further, since the entire discharge valve moves, the entire discharge valve moves through the compressed fluid or the lubricating oil at the time of insufficient compression or at the time of closing the valve immediately after the discharge. At the same time, compressed fluid or lubricating oil enters between the entire surface of the discharge valve and the contact surface of the fixed scroll, and these cause a buffering action. Thus, it is possible to control the impact noise generated when the discharge valve is closed even though the apparent spring constant of the discharge valve is zero.

[0013]

DETAILED 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 comprises a spiral blade 11
1. The fixed scroll 11 includes a fixed scroll 11, a swirling scroll 10 in which a spiral blade 101 is formed on a swivel end plate 102, and a rotation restricting 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 orbiting end plate 102 of the orbiting scroll 10 on the side opposite to the spiral blade 101, and the shaft 103 is rotatably supported by a bearing 131 of the bearing member 13 and a ball bearing 15. 14 is supported by an eccentric hole 141 formed at one end. An electric motor 16 including a stator 161 fixed to the closed casing 17 and a rotor 162 fixed to the main shaft 14 and rotatable with the main shaft is disposed between the two bearing portions 131 and 15 of the main shaft 14.

Therefore, by driving the electric motor 16, the main shaft 14 rotates, and the eccentric hole 141 of the main shaft 14 performs an eccentric rotational movement. As a result, the orbiting scroll 10 attempts to rotate, but since the rotation is restricted by the rotation restricting component 12, the main shaft 14 and the orbiting scroll 1 are rotated.
The turning motion is performed with the radius between the axis and the shaft portion 103 having a radius of 0. As a result, a plurality of symmetrical compression working spaces 19 formed by meshing the spiral blade 111 of the fixed scroll 11 and the spiral blade 101 of the orbiting scroll 10 with being shifted from each other by 180 degrees are sucked from the suction pipe 18. The compressed 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 the vicinity of the center, the symmetrical compression work space 19 communicates with the discharge port 112. When the pressure in the compression work space 19 at the moment of the 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, and the discharge port 112 and the discharge space 20 communicate. Then, the compressed fluid is discharged.
If the pressure in the compression work space 19 at the moment of communication is lower than the pressure in the discharge space 20, the discharge valve 221 is not yet opened, and the orbiting scroll 10 is further turned to compress the fluid. The discharge valve 221 is opened only when the pressure at 19 becomes higher than the pressure at 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 includes:
The opening height of the discharge valve 221 is regulated. Also,
If the pressure in the compression working space 19 becomes abnormally high, for example, during liquid compression, the axial compliance mechanism 23
Operates, and the orbiting scroll 10 moves to the bearing member 13 side, so that the spiral blades 11 of the fixed scroll 11
(1) An appropriate gap is formed at the tip to escape the liquid therefrom to avoid an abnormal rise in pressure.

A back pressure partition 24 is provided on the orbiting scroll 10 side of the bearing member. A discharge pressure is applied to the center of the back pressure partition 24 of the orbiting end plate 102, and a suction pressure is applied to the outside. And an appropriate thrust force is applied during normal operation.

[0018]

According to the present invention, as is apparent from the above description,
Even if insufficient compression occurs, backflow is prevented by the discharge valve, and no energy loss occurs. Also, since the entire discharge valve is held so that it can move between the valve presser and the fixed scroll in a direction perpendicular to the surface of the fixed scroll on the discharge space side, the apparent spring constant of the discharge valve becomes 0, It is possible to react instantaneously only to the pressure difference between the outlet and the discharge space, which eliminates the delay in opening the discharge valve and secures a sufficient height when the valve is opened. Can be excluded.

Further, since the entire discharge valve moves, the entire discharge valve moves through the compressed fluid or the lubricating oil at the time of insufficient compression or at the time of closing the valve immediately after the discharge, so that the moving speed of the discharge valve is reduced by the resistance. At the same time, compressed fluid or lubricating oil enters between the front surface of the discharge valve and the contact surface of the fixed scroll, and causes a buffering action. Because of these facts, it was possible to suppress the impulsive sound generated when the discharge valve was closed, even though the apparent spring constant of the discharge valve was 0. Therefore, when the discharge valve was closed, the discharge space of the fixed scroll was fixed by the discharge valve. There is no vibration on the side surface, and almost no impact sound is generated.

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

[Brief description of the 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.

FIG. 3A is a sectional view of a valve device in a conventional scroll compressor, and FIG. 3B is a plan view of the valve.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 10 Orbiting scroll 11 Fixed scroll 12 Rotation restraining part 13 Bearing member 14 Main shaft 19 Compression work space 20 Discharge space 22 Valve device 101 Orbiting scroll swirl vane 102 Orbiting mirror plate 111 Fixed scroll swirl vane 112 Discharge port 113 Inlet port 221 Discharge valve 222 Valve retainer 223 Bolt for fixing valve device

──────────────────────────────────────────────────の Continued on the front page (72) Inventor Sadao Kawahara 1006 Kazuma Kadoma, Kadoma City, Osaka Prefecture Inside Matsushita Electric Industrial Co., Ltd. (72) Inventor Takashi Morimoto 1006 Kadoma, Kadoma, Osaka Prefecture Inside Matsushita Electric Industrial Co., Ltd. (72) Inventor Kiyoshi Sano 1006, Kadoma, Kazuma, Kadoma, Osaka Pref. Japanese Utility Model Application No. 59-75209 (JP, U) Japanese Utility Model Application No. 48-34903 (JP, U) (58) Fields investigated (Int. Cl. ⁷ , DB name) F04C 18/02 311 F04C 29/00

Claims (1)

(57) [Claims] A compression mechanism comprising: a fixed scroll having a spiral blade; a orbiting scroll formed on a revolving head plate with a spiral blade arranged so as to mesh with the fixed scroll to form a plurality of compression work spaces; The compression work space is composed of a rotation restricting component that restricts the rotation of the orbiting scroll to perform the orbital motion, and continuously compresses the fluid taken in at the radially outer peripheral portion of the spiral blade in the compression working space toward the center. In order to discharge the compressed fluid from the discharge port provided near the center of the fixed scroll and to regulate the discharge valve made of an elastic plate and the opening height of the discharge valve so as to open and close the discharge port to the discharge part. Is disposed so that the entire discharge valve can move between the valve press and the fixed scroll in a direction perpendicular to the discharge space side surface of the fixed scroll. Become a scroll compressor.