KR19980076759A - Flapper Type Discharge Valve Assembly of Compressor - Google Patents

Abstract

The present invention provides a flapper discharge valve assembly of a compressor.

The compressor flapper discharge valve assembly includes: a valve plate member (110) provided to be sealed to an upper surface (13) of a cylinder block (13) and having at least a discharge port (114) connected to the cylinder chamber (13 '); A flapper discharge valve 123 having one end fixed at an upper valve receiving portion of the valve plate member 110 so that the discharge port 114 of the valve plate member 110 is opened and closed at the other end according to the internal pressure of the cylinder 13. ); It is fixed at one end and flows at the other end so as to elastically limit the opening degree of the other end of the discharge valve 123 in the upper portion of the discharge valve 123, formed of an elastic material, the discharge when the discharge valve 123 is opened A backing spring 122 'formed with a depression 122a such that the end of the valve 123 does not contact; A stopper member (121) fixed at both ends to fixedly limit an opening degree of the discharge valve (123) and the backing spring (122) at the top of the backing spring (122 '); And it is fixed to the cylinder block 13 with the valve plate member 110, characterized in that it comprises a valve cover 101 to form a discharge chamber.

Accordingly, it is possible to alleviate the shock at the time of opening the discharge valve 123 and to prevent the stress concentration at the time of closing, thereby reducing noise and vibration and improving the performance, life and reliability of the valve.

Description

Flapper Type Discharge Valve Assembly of Compressor

The present invention relates to a flapper-type discharge valve assembly of a compressor, and more particularly to a compressor having a flapper-type discharge valve assembly, it is possible to reduce the noise and vibration caused by the impact when the discharge valve is opened with a simple structure The present invention relates to a flapper discharge valve assembly of a compressor capable of improving the reliability and life of a valve.

Compressors typically convert mechanical energy into compressive energy of a compressive fluid, which are reciprocating, rotary and turbo. When such a compressor is used for a refrigerator, the saturated steam of a low boiling point refrigerant having the inside of the refrigerator as a low heat source and the outside as a high heat source is compressed to a high pressure and flowed to a condenser. In the condenser, latent heat of evaporation is released from the high-pressure and high-temperature refrigerant to a high heat source outside the refrigerator, causing a phase change to a liquid refrigerant, and the liquid refrigerant is throttled to low pressure and low temperature through an expansion valve. It enters the evaporator. The low pressure and low temperature refrigerant in the evaporator absorbs latent heat from the low heat source inside the refrigerator in the liquid phase, thereby causing a phase change to the saturated steam refrigerant, and then flowing into the compressor described above to form a refrigeration cycle. In the middle of repeating such a refrigeration cycle, the inside of the refrigerator is continuously supplied with cold air to bring a desired freezing (jang) effect.

Typically, a compressor for a domestic refrigerator is mainly installed in a lower stage of a refrigerator, which is closed in a case together with a driving electric motor of one stage, and the upper case is removed in FIG.

In the reciprocating compressor 10, the electric motor and the compressor are hermetically housed in the upper and lower cases 12 and 11 for soundproofing and dustproofing, and the upper and lower cases 12 and 11 are predetermined. At intervals of, it is supported by means of suitable dust and soundproofing means, for example compression springs or leaf springs, via the frame 24 at the bottom or side of the upper and lower cases 12, 11.

The above-described reciprocating compressor is composed of a cylinder block 13 fixed to the upper portion of the frame 24 horizontally in Figure 1 and a piston 14 reciprocally inserted into the cylinder therein (see Figure 2), By the reciprocating motion of the piston 14, low pressure and low temperature refrigerant gas is sucked through the suction and discharge valves 15 provided at the left end of the cylinder block 13, and high pressure and high temperature refrigerant gas is discharged. The suction and discharge valve 15 is composed of a flapper or reed type thin plate structure which is usually elastic for miniaturization, and the flapper or lead type suction and discharge valve 15 acts on both sides. It is opened and closed passively by the pressure difference.

In the reciprocating compressor configured as described above, the suction pipe (connecting pipe) 22 in which the low pressure and low temperature refrigerant gas is hermetically fixed to the upper or lower cases 12 and 11 during the backward movement of the piston 14. And a high pressure and a high temperature discharged from an external evaporator (not shown) to the suction lead valve of the suction and discharge valve 15 via the suction muffler 16 and discharged from the compressor during the forward movement of the piston 14. The refrigerant gas of the external condenser is discharged from the discharge valve of the suction and discharge valve 15 through the discharge pipe 23 'and the discharge pipe connecting pipe 23 fixedly sealed to the upper or lower cases 12 and 11. It is sent out (not shown). The refrigerant charging pipe 22 'is hermetically fixed to the lower case 11, and initially filled with refrigerant gas, and then sealed.

In addition, the compressor noise, which accounts for most of the operation noise of the refrigerator, is generated by the reciprocating motion of the piston 14, the opening and closing shock of the suction and discharge valves 15, the pulsation of the refrigerant gas, and the pulsation of the refrigerant gas. In order to reduce noise caused by the pulsation of the suction and discharge pressures, the refrigerant gas introduced into the suction pipe (connecting pipe) 22 is charged inside the upper and lower cases 12 and 11 and through the suction muffler 16. The refrigerant sucked into the cylinder 13 and compressed in the cylinder 13 is discharged to the discharge pipe 23 ′ through the discharge muffler 17.

On the other hand, the electric motor is composed of a stator 18 fixedly installed at the lower part of the frame 24, and a rotor 19 rotating with a gap between the stator 18 (see FIG. 2). 19 is fixed to the rotating shaft 20 and rotatably supported by the frame 24 to rotate together. By forming the eccentric shaft 21 at the end of the rotating shaft 20 of the electric motor to the upper portion of the frame 24 to connect the piston 14 to the eccentric shaft 21 through the connecting rod and the number of shafts, The piston 14 reciprocates by the amount of eccentric rotation of the eccentric shaft 21. In addition, an external power source is applied to the winding coil of the stator 18 of the electric motor via an external terminal 18 'which is hermetically fixed to the upper and lower cases 12 and 11.

In order to smoothly operate the compressor and the driving motor as described above, a coolant oil storage tank 25 in which coolant oil is stored is formed at the bottom of the lower case 11, and the lubricating oil supply groove 20 'of the rotating shaft 20 is formed. As it is sucked into the upper portion, the refrigerant oil is supplied to each lubrication part to perform lubrication.

3 and 4 show an example of the structure of a conventional flapper discharge valve in detail. The flapper discharge valve system includes a valve plate member 110, a discharge valve 123, a backing spring 122, a stopper member 121, and a valve cover 101.

The valve plate member 110 is provided with a discharge port 114 that communicates with the inside of the cylinder 103, and the discharge valve 123 is installed at the upper portion of the discharge port 114 so as to be opened and closed for discharge of the high pressure gas. The backing spring 122 is installed on the upper part of the discharge valve 123 to elastically limit the opening and closing area thereof, and the stopper member 121 moves the discharge valve 123 and the backing spring 122 into position. Restrict to maintain

The upper surface of the valve plate member 110, the first receiving portion 111 formed to receive the stopper member 121, and the backing spring 122 and the discharge in the lower portion of the first receiving portion 111 The second accommodating part 112 formed to accommodate the valve 123, the support space 113 formed to open and close the discharge valve 123 smoothly under the second accommodating part 112, and the support space. A discharge port 114 having an end portion protruding to correspond to the height of the second accommodating portion 112 is formed at a predetermined position of the 113 so as to minimize the volume of the discharge port 114. 3 and 4, protrusions 125 and 124 are protruded from one end of each of the discharge valve 123 and the backing spring 122, and a support portion (2) is provided in the second receiving portion 112. 116 is formed to accommodate the protrusions 125 and 124 protruding from the discharge valve 123 and the backing spring 122 to operate without the discharge valve 123 and the backing spring 122 flowing. It is configured to be.

However, as described above, when the discharge valve 123 is opened, the discharge valve 123 is connected to the backing spring 122 and the stopper member due to the pressure of the high-pressure refrigerant gas according to the reciprocating motion of the high speed piston 14. It collides with the line 121 in a line contact, causing loud noise and vibration. In particular, after the discharge valve 123 hits the backing spring 122, the backing spring 122 collides with the stopper member 121. The impact on the backing spring 122 is absorbed to some extent by the elastic force, but the stopper member The hit to 121 has a problem that appears as it is noise and vibration. As shown in detail in FIG. 4, when the discharge valve 123 is opened, the backing spring 122 is in line contact with the backing spring 122 at the end thereof so that an alternating impact load acts, thereby generating sharp noise and vibration. However, sufficient strength of the backing spring 122 and the discharge valve 123 is required, and there is a problem such as a crack easily.

Accordingly, an object of the present invention is to solve the above-described problems, and to provide a valve system of a hermetic compressor that can reduce the noise and vibration of the compressor with a simple structure and further improve the reliability of the compressor. have.

1 is a plan view showing the internal structure of a hermetic reciprocating compressor;

2 is a cross-sectional view taken along line 2-2 of FIG. 1 showing the internal structure of the hermetic compressor;

3 is a partially enlarged cross-sectional view showing the structure of a flapper discharge valve assembly of a conventional compressor;

Figure 4 is a partial cross-sectional view showing the discharge valve open state of Figure 3 for explaining the problems of the prior art,

5 is a partially enlarged cross-sectional view similar to FIG. 4 of a flapper type discharge valve assembly of the compressor of the present invention.

Explanation of symbols on the main parts of the drawings

10 compressor 11 lower case

12: upper case 13: cylinder

14 piston 15 suction and discharge valve assembly

16: suction muffler 17: discharge muffler

18: stator (stator) 19: rotor (rotor)

20: axis of rotation 21: eccentric shaft

22: suction pipe (connecting pipe) 23; Discharge pipe connector

23 ': discharge pipe 24: frame

25: refrigerator oil storage tank 110: valve plate

123: flapper discharge valve 121: stopper

101: valve cover 122: backing spring

To achieve this object, the present invention is directed to a compressor having a flapper-type discharge valve assembly fixed to a cylinder block to seal an upper portion of the cylinder block and opened and closed according to the reciprocating motion of a piston in the cylinder chamber. A wrapper type discharge valve assembly; A valve plate member installed to be sealed on an upper surface of the cylinder block and having at least a discharge port leading to the cylinder chamber; A flapper discharge valve having one end fixed at an upper valve receiving portion of the valve plate member to open and close the discharge port of the valve plate member according to the internal pressure of the cylinder at the other end; It is fixed at one end and flows at the other end to elastically limit the opening degree of the other end of the discharge valve at the upper part of the discharge valve, is formed of an elastic material, and when the discharge valve is opened, the end of the discharge valve is not contacted. Additionally formed backing spring; A stopper member fixed at both ends to fixedly limit an opening degree of the discharge valve and the backing spring at an upper portion of the backing spring; And a valve cover fixed to the cylinder block together with the valve plate member to form a discharge chamber.

In addition, by matching the shape of the backing spring with the bending shape at the time of opening the discharge valve, the backing spring is brought into contact with the entire area during opening of the discharge valve, thereby further reducing noise and vibration, and further improving the reliability of the valve. .

Hereinafter, with reference to the accompanying drawings will be described in detail the configuration and operation of the embodiment of the present invention.

5 shows the structure of a valve system of a hermetic compressor according to the invention in part detail.

The flapper discharge valve assembly comprises a valve plate member 110, a flapper discharge valve 123 and a stopper member 121, as in the prior art described with reference to FIG. 3, and the present invention. In some embodiments, the backing spring 122 ′ includes a backing spring 122 ′ as shown in FIG. 5.

The valve plate member 110 is arranged to be sealed to the upper surface 13 of the cylinder block 13, as shown in Figure 3 and the discharge port 41 'for communicating the cylinder chamber 13' to the discharge chamber is formed and the upper surface A valve accommodating part for accommodating the flapper discharge valve 123 and the backing spring 122 may be formed, and a valve seat part in which the discharge valve 123 is seated may be formed around the discharge port 41 ′.

In addition, one end of the flapper discharge valve 123 is connected to the upper surface of the valve receiving member 110 so as to open and close the discharge port 114 of the valve plate member 110 according to the internal pressure of the cylinder. It is fixedly inserted.

In addition, the backing spring 122 ′ shown in FIG. 5 is inserted into the valve receiving portion, fixed at one end, and flowed by sliding at the other end, so that the other end of the discharge valve 123 is disposed above the discharge valve 123. It is formed of an elastic material to elastically limit the degree of opening, and according to the present invention, the depression 122a is formed so that the end of the discharge valve 123 does not contact. In addition, it is preferable that the shape of the backing spring 122 'matches the bending shape at the time of opening of the discharge valve 123 so that the shape of the backing spring 122' comes into contact with the entire area when the discharge valve 123 is opened.

The stopper member 121 is fixed to the cylinder block 13 as shown in Figure 3 is configured to fixedly limit the opening degree of the discharge valve 123.

In addition, the valve cover 101 also has an upper surface 13 of the cylinder block 13 together with the valve plate member 110 disposed in the middle so as to form a discharge chamber hermetically closed at the top of the stopper member 121 as shown in FIG. 3. It is fixed to).

The assembly of the flapper-type discharge valve assembly of the compressor according to the embodiment of the present invention configured as described above is performed by a conventional method, and the operation thereof will be described below with reference to FIG. 5. 5 is a partially enlarged cross-sectional view of a flapper valve system for explaining the action of the backing spring 122 ′ according to the present invention with the discharge valve 123 open.

First, the operation together with FIG. 3, the discharge valve 123 has a pressure of the cylinder chamber 13 'as the piston 14 moves forward in the cylinder chamber 13'. When the flapper discharge valve 123 is larger than the pressure of the discharge chamber 102, the flap-type discharge valve 123 is bent upwardly and rotated against its elastic force toward the discharge end 41 of the valve plate member 110. ') Is opened, and the compressed refrigerant gas in the cylinder chamber 13' is discharged to the discharge chamber.

In this way, when the discharge valve 123 is opened, it rotates at a high speed by a high-pressure refrigerant gas and is opened so that the backing spring 122 'is hit by a strong collision force, and a partial collision force is applied to the backing spring 122'. While being absorbed, it collides with the stopper member 121 together with the backing spring 122 '. At this time, the depression 122a of the backing spring 122 'is formed at the end of the discharge valve 123 where the discharge valve 123 collides with the backing spring 122' so that the impact is removed at the end. do. Further, when the curvature of the backing spring 122 'coincides with the curvature at the time of opening of the discharge valve 123, when the discharge valve 123 collides with the backing spring 122', it is in contact with the entire surface and collides with the impact force. It is distributed by the whole area.

Accordingly, the collision point between the discharge valve 123 and the backing spring 122 'is not in line contact (A) as in the prior art but in surface contact, thereby greatly reducing the impact force per unit area.

Therefore, not only the sharp noise and vibration are eliminated, but also the conventional concentrated stress does not act on the backing spring 122 'and the discharge valve 123, and the stress applied per unit area is much smaller than that of the conventional discharge valve 123. ) And the design criteria can be lowered in terms of strength of the backing spring 122 ′ and improved reliability and lifespan.

Meanwhile, as described above, the flapper discharge valve 123 is elastically limited by the backing spring 122 'such that the flapper discharge valve 123 is not bent or deformed excessively by the pressure of the discharged refrigerant gas, and the stopper member 121 After the rotation of the piston 14 is fixedly limited, the flapper-type discharge valve 123 is rapidly moved by its elastic force and the elastic force of the backing spring 122 'at the top dead center of the piston 14 or in the reverse direction. The discharge port 114 is returned to close the piston 14, and during the retraction of the piston 14, the pressure of the cylinder chamber 13 'is lower than the pressure of the discharge chamber, so that the closed state of the flapper discharge valve 123 is naturally maintained. One cycle ends and the above cycle is repeated.

In addition, even when the discharge valve 123 is closed, the discharge valve 123 is closed by the entire area of the backing spring 122 ′, so that the discharge valve 123 is closed quickly. Does not occur, thereby further improving the reliability of the valve.

According to the configuration and operation of the flapper type discharge valve assembly of the compressor according to the embodiment of the present invention described above, when the discharge valve 123 is opened by forming the recess 122a in the backing spring 122 '. It can reduce the noise and vibration by reducing the impact of the shock and reduce the concentration of stress in the closing, and can improve the performance and reliability or life of the valve.

While the invention has been shown and described in connection with certain preferred embodiments, the spirit of the invention described above is applicable not only to valve systems of various structures having a backing spring other than that of FIG. 3, but also to the following claims. Those skilled in the art can readily appreciate that the present invention can be variously modified and changed without departing from the spirit or the field of the present invention provided by the present invention.

Claims (2)

A compressor having a flapper-type discharge valve assembly fixed to the cylinder block 13 to seal an upper portion of the cylinder chamber 13 'and opened and closed according to the reciprocating movement of the piston 14 in the cylinder chamber 13'. In the flapper discharge valve assembly, A valve plate member 110 installed to be sealed to the upper surface 13 of the cylinder block 13 and having at least a discharge port 114 communicating with the cylinder chamber 13 '; A flapper discharge valve 123 having one end fixed at an upper valve receiving portion of the valve plate member 110 so that the discharge port 114 of the valve plate member 110 is opened and closed at the other end according to the internal pressure of the cylinder 13. ); It is fixed at one end and flows at the other end so as to elastically limit the opening degree of the other end of the discharge valve 123 in the upper portion of the discharge valve 123, formed of an elastic material, the discharge when the discharge valve 123 is opened A backing spring 122 'formed with a depression 122a such that the end of the valve 123 does not contact; A stopper member (121) fixed at both ends to fix the opening degree of the discharge valve (123) and the backing spring (122 ') at an upper portion of the backing spring (122'); And A flapper type discharge valve assembly of a compressor, characterized in that it comprises a valve cover (101) fixed to the cylinder block (13) together with the valve plate member (110) to form a discharge chamber. 2. The compressor of claim 1, wherein the shape of the backing spring 122 'coincides with the bent shape of the discharge valve 123 when the discharge valve 123 is in contact with the entire surface when the discharge valve 123 is opened. Wrapper type discharge valve assembly.