KR100228857B1 - Flapper type valve structure of a compressor - Google Patents

Abstract

The present invention provides a flapper type valve structure of a compressor.

The flapper type valve structure of the compressor is fixed to a cylinder block 13 'so as to close the upper portion of the cylinder 13 and is opened and closed according to the reciprocating motion of the piston 14 in the cylinder 13 Type intake and discharge valve assemblies 15 are disposed in the upper portion of the cylinder block 13 'and have an inlet or outlet 31' communicating with the cylinder 13 and a flat valve seat 31 ' And a valve plate 31 formed on the lower surface or the upper surface of the valve plate 31 so as to open and close the inlet or outlet 31 'of the valve plate 31 in accordance with the internal pressure of the cylinder 13 And the inside of the contact portion includes a flapper type valve 62 formed as an inclined asymmetric groove portion so that an opening force is eccentrically applied to the one side of the valve seat 31 " And It shall be.

As a result, unstable opening operation and performance deterioration of the valve by oil sticking can be eliminated, reliability and lifetime of the valve opening and closing operations can be improved, and manufacturing cost is reduced.

Description

Flapper type valve structure of compressor

The present invention relates to a flapper type valve structure of a compressor, and more particularly, to a compressor having a flapper type valve assembly, which can reliably operate but simplify the structure and deteriorate performance due to oil sticking To a flapper type valve structure of a compressor.

Compressors typically convert mechanical energy into compressive energy of a compressible fluid, such as reciprocal, rotary, and turbo-models. When such a compressor is used for a refrigerator, saturated steam of a low boiling refrigerant whose inside is a low heat source and whose outside is a high heat source is compressed to a high pressure and flows to a condenser.

In the condenser, the latent heat of evaporation from the high-pressure and high-temperature refrigerant is discharged to a high-temperature source outside the refrigerator, causing a phase change to the refrigerant in the liquid state. After the refrigerant in this liquid phase is throttled at low pressure and low temperature through the expansion valve, And then flows into the evaporator.

The low-pressure and low-temperature refrigerant in the evaporator absorbs the latent heat from the low-temperature heat source in the refrigerator, causing a phase change to the saturated vapor state refrigerant, and then flows into the above-described compressor to constitute a refrigeration cycle. While repeating such a refrigeration cycle, the inside of the refrigerator is constantly supplied with cold air, resulting in a desired refrigeration effect.

The compressor for a household refrigerator is mainly a reciprocating type of one stage and is installed in a lower portion of a refrigerator while being enclosed in a case together with the driving electric motor. FIG. 1 is a plan view of the internal structure with the upper case removed.

In the reciprocating compressor 10, an electric motor and a compressor are hermetically enclosed in the upper and lower cases 12 and 11 for soundproofing and dustproofing, Are supported by a suitable dustproof and soundproofing means, for example a compression spring or a leaf spring, through the frame 24 at the lower or side thereof to the upper and lower cases 12,

The above-described reciprocating compressor comprises a cylinder block 13 'fixed to the upper portion of the frame 24 horizontally in FIG. 1 and a piston 14 reciprocally inserted into the cylinder therein (see FIG. 2 Pressure refrigerant gas at low temperature and low temperature is sucked through the suction and discharge valve assembly 15 provided at the left end of the cylinder block 13 'by the reciprocating motion of the piston 14, Is discharged. The suction and discharge valve assembly 15 is composed of a flapper or a reed-type thin plate structure which is usually resilient for miniaturization. The flapper or lead type suction and discharge valve assembly 15 has a double- And is actively opened and closed by a pressure difference acting on the valve.

In the reciprocating compressor thus configured, the low-pressure and low-temperature refrigerant gas in the backward movement of the piston 14 is connected to the suction pipe connecting pipe 22, which is hermetically fixed to the upper and lower cases 12 and 11, (Not shown) to the suction reed valve of the suction and discharge valve assembly 15 via the muffler 16 and is supplied to the suction reed valve of the suction and discharge valve assembly 15 at a high pressure and a high temperature The refrigerant gas flows from the discharge valve of the suction and discharge valve assembly 15 through the discharge pipe 23 'and the discharge pipe connecting pipe 23, which is hermetically fixed to the upper and lower cases 12 and 11, (Not shown). The refrigerant filling pipe 22 'is hermetically fixed to the lower case 11 and is initially sealed with the refrigerant gas filled therein.

The compressor noise, which occupies most of the operating noise of the refrigerator, is generated by reciprocating motion of the piston 14, opening and closing shock of the suction and discharge valve assembly 15, suction of the refrigerant gas and pulsation of the discharge pressure, The refrigerant gas introduced into the suction pipe connecting pipe 22 for reducing the noise caused by the pulsation of the suction and discharge pressures of the suction and discharge pressures of the cylinder 11 is filled in the upper and lower cases 12, (13), and the refrigerant compressed in the cylinder (13) is discharged to the discharge pipe (23 ') through the discharge muffler (17).

The electric motor includes a stator 18 fixed to the lower portion of the frame 24 and a rotor 19 rotating with the gap 18 between the stator 18 and the stator 18 The electrons 19 are fixed to the rotating shaft 20 and are rotatably supported on the frame 24 so as to rotate together. An eccentric shaft 21 is formed at an upper portion of the frame 24 at the end of the rotary shaft 20 of the electric motor so that the piston 14 is connected to the eccentric shaft 21 via a connecting rod and a shaft, The piston 14 reciprocates by the eccentric rotation amount of the eccentric shaft 21. [ External power is applied to the winding coil of the stator 18 of the electric motor through 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 that operate as described above, the refrigerator oil reservoir 25, in which refrigerator oil is stored on the bottom of the lower case 11, is formed and the lubricant supply grooves 20 ' So that the lubricating oil is supplied to each lubricating part while being sucked to the upper part to lubricate.

The conventional flapper type discharge valve has a structure in which a valve and a stopper are fixed to a valve plate by using a rivet and a valve and a stopper are fixed by forming a mounting groove in the valve plate. Has a form in which a thin plate is inserted and fixed between a valve plate and a cylinder block. Since the flapper type valve is a thin plate, the refrigerant oil which is sucked up from the freezer oil reservoir 25 through the lubricating oil supply groove 20 'of the rotary shaft 20 and scattered is mixed into the refrigerant gas, And the valve seat is closed by the flapper type valve. However, when the flapper valve is closed, it is possible to prevent the energy loss Further, the oil seizing causes the opening to be torn off and the opening operation becomes uneven, resulting in deterioration of the valve performance.

As an invention for solving such a problem, the contents of US Pat. No. 4,642,037 are shown in FIGS. 3 (a) and 3 (b). 3 (a) and 3 (b), the flapper type suction valve system includes a valve plate 31, a flapper type valve 32, and a discharge valve cover 37 ).

The flapper type valve 32 forms a slightly opened state as shown in Figs. 3 (a) and 3 (b) in a state in which no force is applied. That is, the flapper type valve 32 is formed on the fixing surface 32 'of the flapper type valve 32 such that the flapper type valve 32 is tilted to one side in the connection portion 40 and tilted slightly to open. Since the one side of the flapper type valve 32 is intended to be opened at the top dead center of the piston 14 immediately before the opening force is applied to the flapper type valve 32, The flapper type valve 32 can be easily opened from one side against the adhering force of the valve seat 32 to the valve seat 31 ".

However, since the flapper type valve of the compressor having the above-described structure must be plastic-deformed at one side during manufacture, the plastic deformation lowers the elasticity for opening and closing operation of the valve and the strength becomes weak, Is lowered. Further, the connecting portion 40 of the flapper type suction valve is further weakened by repeated application of compressive force and tensile force, which is also complicated in terms of the manufacture of the flapper type valve 32, There is also a problem.

SUMMARY OF THE INVENTION Accordingly, the present invention has been made keeping in mind the above problems occurring in the prior art, and an object of the present invention is to provide a flapper type valve structure of a compressor having improved reliability and durability by eliminating unstable operation due to oil sticking of the flapper type valve The purpose is to provide.

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

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

3 (a) is a partially enlarged cross-sectional view showing the structure of a flapper type valve of a conventional compressor,

Figure 3 (b) is a partial perspective view of the flapper valve portion of Figure 3 (a).

FIG. 4 is a partially enlarged sectional view showing a flapper type valve structure of a compressor according to an embodiment of the present invention; FIG.

FIG. 5 is a partially enlarged plan view showing a flapper type valve structure of a compressor according to another embodiment of the present invention; FIG.

6 is a partially enlarged cross-sectional view showing a flapper type valve structure of a compressor according to another embodiment of the present invention.

DESCRIPTION OF THE REFERENCE NUMERALS

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: rotation shaft 21: eccentric shaft

22: Suction pipe connector 23: Discharge pipe connector

23 ': Discharge pipe 24: Frame

25: refrigerator oil tank 31,41: valve plate

31 ', 41': discharge port 31 ", 41": valve seat

32, 42, 52, 62: Flapper type valve

In order to achieve the above object, the present invention provides a compressor having a flapper type suction and discharge valve assembly which is fixed to a cylinder block so as to close an upper portion of the cylinder and is opened or closed in accordance with a reciprocating motion of the piston in the cylinder, A valve plate disposed at an upper portion of the block and formed with a suction port or a discharge port communicating with the cylinder and having a flat valve seat; The valve plate is installed on the lower surface or the upper surface of the valve plate so as to open or close the inlet or outlet of the valve plate in accordance with the internal pressure of the cylinder. The portion contacting the valve seat is formed flat and the opening force is eccentrically Wherein the inside of the contact portion includes a flapper type valve formed of an inclined asymmetric groove portion.

Further, the flapper type valve may be eccentrically connected to the connection portion so that the opening force is eccentrically applied to one side.

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

FIG. 4 is a partially enlarged cross-sectional view of a flapper type discharge valve structure of a compressor according to an embodiment of the present invention.

In FIG. 4, the flapper type discharge valve structure is constituted by including a valve plate 41 and a flapper type valve 42.

The valve plate 41 is disposed at an upper portion of the cylinder block 13 'and has a suction port (not shown) communicating with the cylinder 13 and a discharge port 41' And a valve seat 41 "for closing the discharge port 41 'is formed obliquely.

The flapper type valve 42 is provided on the upper surface of the valve plate 41 so as to open and close the discharge port 41 'of the valve plate 41 in accordance with the internal pressure of the cylinder 13, There is a method in which a valve and a stopper are fixed to a valve plate by using a rivet as in the conventional method and a method in which a valve and a stopper are fixed by forming a mounting groove in the valve plate.

In the case where the valve plate 41 is formed by sintering, the inclined valve seat 41 '' can be easily formed by inclining and polishing or finishing from the sintering step. In the case of the rolled plate material, the inclined valve seat 41 ' Quot;) can be inclined by being pinched by the piercing punch or the stripper at the same time as the piercing of the suction port or the discharge port 41 ', which is more effective in terms of production.

By forming the sloped flapper type valve in this manner, instability due to oil sticking can be solved even when the valve itself is not plastically deformed, and further, the performance of the valve can be improved.

Further, a flapper type valve structure of a compressor according to another embodiment of the present invention is shown in partial plan view in FIG. 5. In this embodiment, the flapper type valve 52 is eccentrically connected to the connection portion 52 'by the eccentricity r. However, the valve plate may be formed in the same plane as in the prior art, or may be formed obliquely as in FIG.

Although the flapper type valve 52 is eccentrically connected to the connection portion 52 'so that the opening force of the valve due to the internal pressure of the cylinder 13 acting on the suction port or the discharge port 41' The opening force is concentrated on the eccentric side by the amount of eccentricity r from the connecting portion 52 ', that is, in the portion C' in FIG. 5, and is opened first so as to destroy the balance of the adhesive force by oil sticking The instability due to oil sticking is removed, and the performance and reliability of the valve can be improved.

According to another embodiment of the present invention, the flapper type valve 62 in FIG. 6 is formed flat at a portion contacting the valve seat, and an asymmetric recessed portion . The recess may be formed at the same time when slitting from the fixed portion of the valve, or may be easily formed by press forming in a separate process.

Since the compression force of the refrigerant gas forming the opening force is perpendicular to the inclined surface by the inclined recessed groove portion formed in this way, the opening force acts perpendicularly to the inclined surface in the direction of the arrow, So that the valve can be opened easily and stably. Further, when the flapper type valve 62 is eccentrically connected to the connecting portion as in FIG. 5, it is possible to further improve the performance and reliability by eliminating unstable operation due to oil sticking, Or may be formed to be inclined as shown in FIG.

As a result of carrying out the embodiments of the above-described construction, it has been found that, in terms of performance of the valve, at least EER 3.4 And the discharge valve was improved by 1.1% or more.

Although the flapper type discharge valve has been described with reference to FIGS. 4 to 6, the same can be applied to the flapper type discharge valve.

According to the structure and operation of the flapper type valve structure of the compressor according to the present invention as described above, the flapper type valve is formed as an asymmetric recessed portion in which the inside of the contact portion of the flapper type valve is eccentrically or in contact with the valve seat This makes it possible to eliminate the unstable opening operation and the performance deterioration of the valve by oil sticking and further improve the reliability or lifetime of the valve opening and closing operations of the valve and simplify the manufacturing process and reduce the cost.

Claims (2)

A flapper type suction and discharge valve assembly 15 which is fixed to the cylinder block 13 'to seal the upper portion of the cylinder 13 and opens and closes in accordance with the reciprocating movement of the piston 14 in the cylinder 13 A valve plate 31 provided on an upper portion of the cylinder block 13 'and formed with a suction port or a discharge port 31' communicating with the cylinder 13 and a flat valve seat 31 " Is provided on the lower surface or the upper surface of the valve plate 31 so as to open or close the inlet or outlet 31 'of the valve plate 31 in accordance with the internal pressure of the cylinder 13 and to contact the valve seat 31 " Characterized in that the inside of the contact portion comprises a flapper type valve (62) formed as an asymmetric recessed portion so that the opening portion is formed flat and the opening force is eccentrically applied to either side. Wrapper type ball Structure. The flapper type valve structure of a compressor according to claim 1, wherein the flapper type valve (62) is eccentrically connected to a connecting portion so that an opening force is eccentrically applied to one side.