JPH11182432A - Valve structure of compressor - Google Patents

Abstract

PROBLEM TO BE SOLVED: To eliminate opening delay of a valve, to reduce horse power consumption and to prevent a noise by forming a delivery valve to allow only a unidirectional flow to a delivery chamber from a compression space in a cap shape having the thick tip out of an elastic member, and housing a columnar retainer part inside this delivery valve. SOLUTION: In a delivery valve 20 to open/close a delivery port 4 formed in the center of an end plate part of a fixed scroll of a scroll compressor, the main body part is made freely extensible/contractible by being formed, for example, in a bellows shape, and a tip part 21 is formed of a thick cap- shaped elastic body. A retainer 1 is housed in the delivery valve 20 to guide extensible/contractible motion of the delivery valve 20. The delivery valve 20 formed in this way flows out fluid to a delivery chamber 10 by opening the delivery port 4 by deflecting the delivery valve 20 when pressure of the delivery port 4 becomes higher than the sum of pressure of the delivery chamber 10 and elastic force of the delivery valve 20. When delivery pressure reduces, the delivery valve 20 extends to put the delivery port 4 in a valve opening state.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a compressor generally used for a vehicle air conditioner, a general refrigeration air conditioner, a heat pump, an air compressor and the like.

[0002]

2. Description of the Related Art FIG. 1 shows a conventional scroll compressor. The rotation of the crankshaft 7 causes the orbiting scroll 6 to turn through the drive bush 8. However, since the drive bush 8 is offset from the rotation axis of the crankshaft 7, the rotation axis of the orbiting scroll 6 fitted to the drive bush 8 is also offset from the center, and the entire orbiting scroll 6 is indicated by its name. (The eccentric hole of the drive bush revolves orbits relative to the crankshaft <spindle>, but the annular boss of the oscillating scroll fitted in the eccentric hole also Off center,
In addition, since it is installed inside the orbiting scroll, the entire orbiting scroll appears to be orbiting.) The orbiting scroll is sometimes described as “movable scroll” or “orbiting scroll”).

A plurality of closed spaces 9 are formed by eccentrically moving the fixed scroll 5 and the orbiting scroll 6 by a predetermined distance from each other and shifting the angle by 180 degrees. The closed space 9 is wider on the outer circumference and narrower on the inner circumference. Therefore, the fluid moves while being compressed from the outer circumference to the inner circumference, and is finally guided to the discharge port 4. The discharge chamber 10 has a high pressure, and the reed valve (valve plate) 3 is normally closed. But,
When the compressed fluid is discharged to the discharge port 4, the reed valve opens due to the pressure difference, and the compressed fluid is discharged to the discharge chamber 10.

The reed valve is provided with a retainer 1 to prevent the reed valve (valve plate) 3 from being damaged by a sudden change in pressure. The problem with this structure is that the reed valve hits the retainer or valve seat, generating noise, damaging the reed valve,
For example, the number of parts increases. Further, since the reed valve and the retainer are fixed by the screw 2, looseness of the screw causes rattling, which leads to generation of noise. As shown in FIG. 1, a retainer 1, a reed valve 3, and a screw 2 for fixing them are required.

A scroll compressor invented to solve the problem of preventing the reed valve from being damaged is disclosed in Japanese Patent Laid-Open No. 5-2 / 5-2.
No. 72472. As shown in FIG. 2, in the present invention, by attaching the elastic member 11 protruding from the valve seat 12, the shock when the discharge valve 13 strikes the valve seat 12 is reduced, and the discharge valve is prevented from being damaged.

Further, in the present invention, an example of FIG. 3 is given as an embodiment. This has the same structure as FIG. 1, but also provides a resilient member 11 protruding around the valve seat 12 to relieve a shock when the reed valve 3 is seated on the valve seat 12, so that the reed valve 3 Prevents damage.

The increase in the number of parts means that the number of assembling steps of the scroll compressor increases, and at the same time, the cost increases. An invention which proposes a solution to this problem is disclosed in Japanese Patent Application Laid-Open No. Hei 5-231351. The basic structure of the present invention is shown in FIG.

As shown in the drawing, the valve body 15 is closed in a passage 19 between a first stopper 17 and a second stopper 18. As a structure, a passage 19 is formed by the discharge cover 16 and the fixed scroll 5.

When the pressure on the high pressure side 10 is high, the valve body 15
On the contrary, when the pressure on the discharge port 4 side is high, the valve body 15 moves along the passage 19 so that the fluid on the high pressure side 10 does not flow toward the discharge port 4 by being pressed against the second stopper 18. The valve body moves in the passage so that the fluid at the discharge port 4 side is pushed up to the stopper 17 side and flows to the high-pressure side 10. By configuring the valve function with the discharge cover and the fixed scroll, the number of parts of the discharge valve is reduced, and the cost is reduced.

[0010]

SUMMARY OF THE INVENTION FIG.
The reed valve having the above structure has the following problems.

(1) The reed valve is composed of a discharge valve (reed valve <valve plate>), a retainer, and a screw made of a thin metal plate, so that the number of parts increases and the cost increases.

(2) Since the reed valve is a cantilever having one fixed side, when the strength is to be ensured, the spring pressure increases and the valve mass increases, so that the delay in opening increases the power consumption and noise. Cause. Also,
Noise is also generated when the reed valve (valve plate) collides with the valve seat when the valve is closed.

(3) Since the reed valve is a cantilever beam, in order to secure a required lift amount, it is necessary to suppress the bending stress to be equal to or less than the fatigue limit of the valve material, and the only option is to lengthen the valve body. However, in this case, in order to place one of the discharge valves on the discharge port arranged substantially at the center of the rear surface of the fixed spiral member, the length of the valve body must be more than a certain length, and the This is an obstacle to downsizing.

Japanese Patent Application Laid-Open No. 5-272472 is an invention that focuses on the strength of a reed valve, and does not mention a reduction in the number of parts and a solution to the noise problem. Japanese Patent Laid-Open No. 5-
Japanese Patent No. 231351 aims to reduce the number of components and does not mention the noise problem.

The problem to be solved by the present invention is as follows.
It is an object of the present invention to develop a discharge valve for a compressor to solve the above-mentioned problems of the related art.

[0016]

SUMMARY OF THE INVENTION In order to solve the problem to be solved by the above-mentioned invention, in a compressor having a discharge valve which allows only one-way flow from a compression chamber to a discharge chamber, the discharge valve is made of an elastic member. And a valve structure of the compressor that has a thick cap at the tip and accommodates a columnar retainer inside the discharge valve.

Further, according to the present invention, the rotation of the crankshaft is caused by the eccentric pin of the large-diameter portion of the main shaft attached to the crankshaft and the eccentric hole of the drive bush fitted to the eccentric pin, and the eccentric hole of the drive bush is used as a revolving motion. A scroll type compressor that transmits fluid to the moving scroll, compresses the fluid by moving it from the outer periphery of the end plate to the inner periphery by a combination of the fixed scroll and the orbiting scroll, and discharges the compressed high-pressure fluid from the discharge port. The present invention has a valve structure of a scroll compressor having a discharge valve formed of a thick cap-shaped elastic member and having a columnar retainer inside the discharge valve.

That is, the following structure is used. (1) A cap-shaped discharge valve made of a thick elastic body at the tip. (2) A part of the inside of the casing is formed as a columnar projection to hold the discharge valve (formation of a retainer). (3) A discharge valve made of an elastic body is mounted so as to cover the retainer provided inside the casing, and when the valve is closed, the distal end is pressed against the back surface of the spiral member by the elasticity of the valve itself.

By adopting the above configuration, an increase in consumed horsepower and an increase in noise due to a delay in opening of the valve can be eliminated, thereby reducing consumed horsepower and preventing noise. In addition, the occurrence of collision noise when the valve is closed is reduced.

[0020]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Embodiments of the present invention will be described based on embodiments with reference to the drawings.

The basic structure is the same as that of the conventional scroll type compressor shown in FIG. 1, but the discharge valve 20 is different. The retainer is housed in the discharge valve 20, and when the pressure of the discharge port 4 becomes higher than the sum of the pressure of the discharge chamber 10 of the elastic body and the elastic force of the discharge valve, the discharge valve is distorted, and the fluid is discharged from the discharge port 4. It flows into the discharge chamber 10. Specific examples of the discharge valve are shown in FIGS.

In FIG. 7, the tip 21 of the discharge valve (valve element) 20 is made of a thick cap-shaped elastic body. The discharge valve (valve element) 20 has a bellows shape in advance, and upon receiving a discharge pressure, contracts and opens as shown in FIG. When the discharge pressure decreases, the valve element extends and closes as shown in 1 of FIG. In this case, an orderly movement state is ensured when increasing or decreasing. This is best illustrated in FIG.

Of course, it is not necessary to have a bellows shape in advance, but it may be an ordinary linear shape, which may be contracted by receiving a discharge pressure due to the elastic material. Although the discharge valve (valve element) 20 shown in FIG. 5 is an elastic body, it does not have a bellows-like structure from the beginning as shown in FIG. Is what it is.

The inside 22 of the valve body is hollow, and usually has the same pressure as the outside of the valve body. That is, in the state when the valve is closed as shown in the figure, the pressure in the casing interior 22 is the same as the pressure in the discharge chamber 10.

The relation of the force applied to the tip 21 of the discharge valve 20 when the valve is closed is shown. In the drawing, f _PH : the force exerted by the pressure of the fluid inside the valve element 22 on the inner surface 23 of the tip 21 f _k : the elastic force of the discharge valve 20 f _PO : the pressure of the fluid at the discharge port 4 is outside the tip 21 Face 24
When the valve is closed, the condition of f _PH + f _k ≧ f _PO ... Is satisfied.

At this time, the outer surface 24 of the distal end portion 21 is pressed against the low plate 12 (valve seat) of the fixed scroll, and the discharge port 4 and the discharge chamber 10 are shut off, thereby suppressing the flow of fluid.
It should be noted that usually, f _k and f _PH at the time of the valve opening is higher than that of when the valve is closed.

When the inequality expression (1) is reversed, that is,
At the moment when the compressed fluid is discharged to the discharge port 4, f _PH + f _k <f _PO ... [Equation 2], and the discharge valve 20 is elastically deformed and is opened. The maximum elastic deformation occurs when the inner surface 23 of the distal end portion 20 comes into contact with the tip of the retainer 1 by the retainer 1. Therefore, the valve lift can be determined by the distance between the inner surface 23 of the distal end 21 of the discharge valve and the distal end of the retainer 1.

When the pressure at the discharge port 4 drops, [Equation 1] is obtained again.
Holds, and returns to the closed state by the elastic force of the discharge valve 20. At this time, since the distal end portion of the discharge valve is made of an elastic body, the shock at which the distal end portion strikes the valve seat is reduced, and the generation of noise is reduced.

Although the inside 22 of the discharge valve 20 may be closed, it is necessary to change the internal pressure when the discharge valve is elastically deformed or to adjust the pressure inside the discharge valve due to the difference in the pressure in the discharge chamber 10. May be. Of course, a discharge valve using a member having elasticity irrespective of the internal pressure of the discharge valve may be used, but the selection range of the member may be narrowed.
Therefore, if f _PH of [Equation 1] is set so that f _PH = the pressure of the fluid in the discharge chamber 10 exerted on the inner surface 23 of the distal end portion 21, the degree of freedom in selecting the members of the discharge valve 20 is increased. Can be provided.

Therefore, in order to solve the above problem, it is preferable to adopt a structure in which the fluid in the discharge chamber and the fluid inside the casing of the discharge valve can enter and exit through the hole as shown in FIG. Several examples are shown in FIG.

FIG. 9 shows a small hole 2 in the direct discharge valve 20.
5 is provided. The hole 25 may be a small hole, and the pressure inside the discharge valve 22 when the valve is closed is reduced by this hole.
It has the function of making the pressure equal to zero. The positions of the holes 25 are provided at various places of the discharge valve 20 in consideration of the effect. 7 is provided at the head of the discharge valve 20, and the responsiveness is preferable. When the valve is open,
The pressure inside the discharge valve increases due to the deformation of the discharge valve,
The pressure change inside the discharge valve can be adjusted by the size of the hole.

FIG. 9-2 shows an example in which holes 25 are provided at the bottom and the tip of the retainer 1 so that the pressure in the discharge chamber 10 and the pressure inside the discharge valve 22 are equalized.

FIG. 8B shows that the other holes 25 are provided as notches, not holes.

In (2) and (3), the inside of the retainer is hollow, but in the case of a retainer in which the inside is clogged, a passage is provided.

[0035]

The effects of using the present invention are as follows.

(1) Since the casing and the retainer are integrated, the number of parts can be reduced, and the production cost can be reduced by simplifying the assembly process.

(2) In the conventional type reed valve, it was difficult to make the reed valve longer than a certain length in order to obtain a required lift amount. Therefore, in the present invention, the retainer and the tip of the discharge valve were difficult. Can be easily adjusted by changing the size of the retainer (exactly, the distance between the inner surface of the discharge valve tip and the tip surface of the retainer). That is what.

(3) In the reed valve, if the strength is secured, the spring pressure increases, so that the horsepower consumed due to the delay in opening increases and the pressure loss increases. However, in the structure of the present invention, the tip requiring strength is thick. Thickness, other than that, the structure is a flexible supporting portion, the opening delay of the valve is reduced by reducing the elasticity of the supporting portion, the loss of horsepower consumption is small, and the pressure loss can be suppressed as much as possible. Also, by communicating the inside and outside of the valve body, the valve opens without compressing the fluid inside the valve, and there is no delay in opening.

(4) Since the valve body is an elastic body, the holding of the valve due to assembly tolerance, component tolerance, etc. does not become unstable, and noise due to rattling is hardly generated.

(5) Since the distal end of the discharge valve is a thick elastic body, noise is less generated when the discharge valve strikes a valve seat when the valve shifts from the open state to the closed state.

Although the embodiment of the present invention is directed to a scroll type compressor, it can also be applied to a compressor using a valve having basically the same kind of structure. In this sense, the present invention has a wide range of applications.

[Brief description of the drawings]

FIG. 1 is a view for explaining a structure of a scroll compressor using a reed valve according to the related art.

FIG. 2 is a view for explaining the structure of a valve body disclosed in Japanese Patent Application Laid-Open No. 5-272472 in the prior art.

FIG. 3 is a view for explaining the structure of a valve body disclosed in Japanese Patent Application Laid-Open No. 5-272472 in the prior art.

FIG. 4 is a view for explaining the structure of a valve body disclosed in Japanese Patent Application Laid-Open No. Hei 5-231351 in the prior art.

FIG. 5 is an embodiment of a scroll compressor using the discharge valve of the present invention.

FIG. 6 shows another embodiment of the present invention.

FIG. 7 is a view for explaining a closed state and an open state of the discharge valve of FIG. 6;

8 shows a perspective view of the discharge valve of FIG.

FIG. 9 shows an example in which communication holes inside and outside the discharge valve are provided in the embodiment of the invention.

[Explanation of symbols]

 Reference Signs List 1 retainer 2 screw 3 reed valve (valve plate) 4 discharge port 5 fixed scroll 6 swinging scroll 7 crankshaft (main shaft) 8 drive bush 9 closed space 10 discharge chamber 11 elastic member 12 valve seat 13 discharge valve 15 valve body 16 discharge Cover 17 First stopper 18 Second stopper 19 Passage 20 Discharge valve (valve element) 21 Discharge valve tip 22 Inside discharge valve 23 Inner surface of discharge valve tip 24 External surface of discharge valve tip 25 Hole

Claims (2)

[Claims] 1. A compressor having a discharge valve that allows only one-way flow from a compression chamber to a discharge chamber, wherein the discharge valve is made of an elastic member, has a thick cap at its tip, and has a columnar shape inside the discharge valve. A valve structure for a compressor, comprising a retainer portion. 2. The rotation of a crankshaft is transmitted to a spiral-type oscillating scroll as a revolving motion of a drive bush by an eccentric pin of a large-diameter portion of a main shaft attached to the crankshaft and an eccentric hole of a drive bush fitted to the eccentric pin. The combination of the fixed scroll and the orbiting scroll compresses the fluid while moving it from the outer periphery of the end plate to the inner periphery, and discharges the compressed high-pressure fluid from the discharge port. A valve structure for a scroll type compressor, comprising a discharge valve formed of the elastic member described above, wherein a columnar retainer portion is accommodated inside the discharge valve.