KR20000050611A - The check valve in scroll compressor - Google Patents

Abstract

PURPOSE: An apparatus for preventing reverse rotation of a scroll compressor is provided to improve the effect of preventing reverse rotation of a rotating scroll and a driving shaft by promptly closing a discharging port by counterflow of gas caused by the difference of pressure between a discharging roll and a compressing room and prevent the noise from being generated. CONSTITUTION: An apparatus for preventing reverse rotation of a scroll compressor includes an overhead open type check valve housing positioned in the upper part of a discharging port(12) for cutting off the counterflow of the discharged gas, a check valve(19) upwardly and downwardly slidably moving in the check valve housing, and a discharging cover(13) controlling the movement of the check valve and forming a path(13a) of the compressed gas for dividing a suction room and a discharging room.

Description

Reverse check mechanism of scroll compressor {The check valve in scroll compressor}

The present invention relates to a scroll compressor, and more particularly, the valve mechanism is rapidly closed by the gas backflow caused by the pressure difference between the discharge chamber and the compression chamber when the scroll compressor is stopped, thereby improving the rotational scroll and preventing the reverse rotation of the drive shaft. The present invention relates to a valve mechanism for preventing abnormal noise.

In general, look at the structure of a conventional scroll compressor as shown in Figures 1 to 3,

First, as shown in FIG. 1, a sealed container 1, which is an external appearance of a scroll compressor, and frames 2 and 3 are provided above and below an inside of the sealed container 1.

A stator (4) press-fitted into the inner surface of the sealed container (1) between the upper and lower frames (2) and (3), a rotor (5) inserted and installed in the inner circumferential surface of the stator (4), A drive shaft 6 press-fitted to the rotor 5 and installed to penetrate the center portion of the upper frame 2; and refrigerant connected to the drive shaft 6 through the suction pipe through a suction pipe in a pivoting motion; A swing scroll (7) for compressing gas, an upper frame (2) for supporting the swing scroll (7), an old dam ring (9) used for maintaining the rotating motion of the swing scroll (7), and On the top surface of the turning scroll 7, a wrap 7a formed in an involute curve, a fixed scroll 8 engaged with the wrap 7a to form an extrusion chamber, and the fixed scroll 8 are mounted on an upper frame ( A bolt 7b fastened to the edge of 2), the boss 7b being eccentrically coupled to the drive shaft 6 on the rear surface of the pivoting scroll 7; An end portion of the drive shaft 6 coupled to the boss 7b is interposed between the drive pin 6a, which is eccentrically and protruded in a predetermined amount, between the drive pin 6a and the boss 7b of the swing scroll 7. The driving bush 10, the oil supply passage 6b formed to terminate the entire drive shaft 6 at the inner side in the longitudinal direction of the drive shaft 6, and the oil passage 6b at the inner side in the lateral direction of the drive shaft 6; ) And an oil groove (not shown) of the journal bearing, which is in communication with the rectangular oil lubrication port (not shown) of the upper frame 2 and selectively communicates with each other, is formed spirally, and both end surfaces of the rotor 5 are formed. Is composed of balancing weights 5a and 5b for canceling an unbalanced force such as the center of the drive shaft 6 and the turning scroll 7 which is eccentric.

In the drawings, reference numerals denote a suction pipe 11, a discharge port 12, a discharge cover 13, a reverse and reverse displacement housing 14, a discharge pipe 15, and an oil pump 16. It consists of.

As a result of the swing motion of the swing scroll 7, a compression chamber is formed between the swing scroll 7 and each of the wraps 7a and 8a of the fixed scroll 8, and the compression chamber is centered by the continuous swing motion. The volume decreases while moving to, the pressure rises and is discharged through the discharge port 12, and the discharged gas passes through the discharge pipe 15 through the discharge chamber 17 and then is sent to the air conditioning system.

The compression mechanism of the scroll compressor consists of a turning scroll 7 and a fixed scroll 8, the upper part of which is a discharge chamber and the lower part of a suction chamber.

As shown in FIG. 3, the discharge cover 13 which separates the suction chamber and the discharge chamber has a refrigerant gas compressed from the compression mechanism to the discharge chamber through a check valve 19 and a check valve housing 18 installed on the rear surface of the fixed scroll 8. The flow path 13a of the discharge cover is formed to be sent.

That is, as shown in FIG. 2A, the compressed gas formed at the compression mechanism during operation of the scroll compressor is sent into the valve valve housing 18 mounted on the fixed scroll 8 through the discharge port 12, and the compressed gas is supplied to the valve valve. Push up the check valve 19, which slides up and down in the housing 18, stop at the stopper 20 formed in the check valve housing 18, and the passage of the check valve housing formed in the stopper 20 ( Block 18a).

At the same time, the gas is discharged into the discharge chamber through the flow path 13a of the discharge cover, and the refrigerant gas compressed through the discharge pipe 15 is sent to a freezing, air conditioning cycle, and the like.

As shown in FIG. 2B, when the scroll compressor stops operating, the pressure of the compression chamber formed between the scrolls is rapidly reduced while the work of the compression mechanism stops, and at the same time, the compressed discharge gas filled in the discharge chamber passes through the flow passage 13a of the discharge cover. Through the passage 18a of the housing to pressurize the valve 19, the valve 19 instantly closes the discharge port 12 of the fixed scroll 8 to discharge the remaining gas in the discharge chamber. To prevent backflow;

The check valve (19) and check valve housing (18) provided on the rear surface of the fixed scroll (8) rotates by rotating the high pressure gas in the discharge chamber through the discharge port (12) to the compression chamber when the compressor is stopped. 7) and the noise caused by the reverse rotation of the drive shaft (6) was installed to prevent this.

However, in conventional scroll compressors, the valve structure is difficult to machine at right angles when machining the valve housing, and wear occurs due to interference with the upper edge portion of the valve. An abnormal noise may be generated at a predetermined pressure or more due to contact between the two, and thus there is a problem of lowering the reliability of the compressor.

When the operation stops, the high-pressure refrigerant gas flows into the valve valve housing through the passage formed in the stopper of the valve valve housing, and this gas prevents the reverse flow by blocking the discharge port provided in the fixed scroll. This is to prevent the noise caused by the reverse scroll of the turning scroll and the drive shaft, but there is a limit to increase the size of the passageway as the inflow path is insufficient to prevent the reverse rotation when stopped.

The present invention has been invented in view of such a conventional problem, and the valve mechanism quickly closes the discharge port by the gas backflow caused by the pressure difference between the discharge chamber and the compression chamber when the scroll compressor is stopped. The purpose is to improve.

In another aspect of the present invention, an object of the present invention is to solve a problem in which abnormal noise occurs over the behavior of the valve member due to pressure imbalance around the valve with respect to pressure fluctuations in the suction pressure ratio and the discharge pressure ratio.

1 is a longitudinal sectional view of a conventional scroll compressor,

2 is a configuration diagram of a reverse rotation preventing device of a conventional scroll compressor,

2A is a configuration diagram of an operating state,

2b is a stationary configuration diagram,

Figure 3 is a plan view of the discharge cover of the conventional scroll compressor reverse rotation prevention device,

Figure 4 is a plan view of the discharge cover of the reverse rotation prevention mechanism of the scroll compressor of the present invention,

5 is a configuration diagram of a reverse rotation prevention mechanism of the scroll compressor of the present invention,

5A is a configuration diagram of an operating state,

Figure 5b is a configuration of the stationary state.

*** Explanation of symbols for the main parts of the drawing ***

7: turning scroll 8: fixed scroll

12: discharge port 13: discharge cover

13a: flow path 18 of the discharge cover: check valve housing

18a: Passage of check valve housing 19: Check valve

20: Stopper 21a, b: flow path of discharge cover

22: Passage of valve housing

The reverse rotation prevention mechanism of the scroll compressor of the present invention and its peripheral portion include an upper open valve valve positioned above the discharge port in the discharge chamber to block the reverse flow of the discharge gas as shown in FIGS. 4 to 5;

A shock valve sliding up and down in the shock valve housing;

Regulating the movement of the check valve, the passage of the compressed gas is formed, characterized in that consisting of a discharge cover divided into a suction chamber and a discharge chamber.

Preferably, the discharge cover has a plurality of flow paths formed on the outside of the center of the valve.

In this way, the valve mechanism of the scroll compressor, which blocks according to the gas pressure ratio between the discharge chamber and the compression chamber, has a valve valve passage for allowing the valve to pass through the housing and stop in the flow path of the discharge cover. By closing the back flow quickly, it is possible to improve the turning scroll and preventing the reverse rotation of the drive shaft.

As a result, it is possible to prevent abnormal noise due to abnormal behavior of the valve, and to prevent wear of the valve valve housing for a long time, thereby increasing the operating life of the compressor, thereby improving the reliability of the compressor.

And, there may be a plurality of embodiments of the present invention, hereinafter will be described in detail with respect to the most preferred embodiment.

Through this preferred embodiment it is possible to better understand the objects, features and advantages of the present invention.

Hereinafter, exemplary embodiments of the scroll compressor according to the present invention will be described in detail with reference to the accompanying drawings.

In addition, in drawing used for description, about the component same as FIG. 1 thru | or FIG. 3, the same code | symbol may be attached | subjected, and the overlapping description may be abbreviate | omitted.

In addition, the technology of the present invention can be applied to various products using a compressor, for example, a product such as an air conditioner or a heater.

Figure 4 is a plan view of the discharge cover of the reverse rotation prevention mechanism of the scroll compressor of the present invention, Figure 5 is a configuration diagram of the reverse rotation prevention mechanism of the scroll compressor of the present invention, Figure 5a is a configuration diagram of the operating state, Figure 5b stops the present invention State diagram.

First, a compression chamber is formed by the relative motion of the turning scroll 7 which is a compression mechanism part, and the scroll wraps 7a and 8a of the fixed scroll 8.

The compression mechanism is composed of a discharge chamber 13, the upper part is the discharge chamber and the lower part is the suction chamber.

As shown in FIG. 4, the discharge cover 13 which separates the suction chamber and the discharge chamber has a refrigerant gas compressed from the compression mechanism to the discharge chamber through a check valve 19 and a check valve housing 18 installed on the rear surface of the fixed scroll 8. The flow passage 21b of the discharge cover is formed to be sent.

That is, as shown in FIG. 5A, a part of the compressed gas formed at the compression mechanism during operation of the scroll compressor is sent through the discharge port 12 into the check valve housing 18 mounted on the fixed scroll 8, and the compressed gas is The valve 19, which slides up and down in the valve housing 18, is pushed upward.

At this time, the check valve housing 18 is open at the top, the movement of the check valve 19 is configured such that the discharge cover 13 is limited, the check valve 19 is the check valve during the operation of the compressor. It penetrates through the passage 22 of the housing and stably stops under the flow passage 21a of the discharge cover so that the compressed gas can be discharged to the discharge port 12.

The compressed gas exiting the discharge port 12 is sent to the discharge chamber through the flow passage 21b of the discharge cover, which is formed at the outer side with respect to the center of the check valve 19.

As shown in FIG. 5B, when the scroll compressor is stopped, the pressure of the compression chamber formed between the scrolls drops rapidly while the compressed discharge gas filled in the discharge chamber suddenly drops the center of the check valve 19. Based on the flow path (21b) of the discharge cover formed in the outer plural number and the check valve (19) as a reference to the flow path (21a) of the other discharge cover formed at the same time at the same time to quickly pressurize the check valve (19) Instantly, the check valve 19 closes the discharge port 12 of the fixed scroll to prevent backflow of the discharge gas remaining in the discharge chamber.

On the other hand, as a comparative example, a conventional valve, i.e., a compressed valve compressed into the compression mechanism part, is introduced into the valve valve housing through a flow path of the discharge port and the discharge cover, and has a valve that slides up and down in the valve valve housing. Unlike the configuration, the present invention allows the check valve to penetrate up and down in the passage of the check valve housing by the pressure gas flowing through the discharge port and the flow path of the discharge cover.

As a result, according to the present invention, when the compressor stops operating, the valve mechanism closes the discharge cover quickly due to the reverse flow of gas, thereby improving the effect of preventing the reverse rotation of the turning scroll and the drive shaft and preventing the valve from being caught in the housing. At the same time, it can prevent abnormal noise caused by abnormal behavior of the check valve.

It is clear from the above description that the present invention has an effect of improving the anti-rotation effect by preventing the valve mechanism according to the variable pressure ratio change of the compressor to be stable and to prevent abnormal noise.

In addition, it is easy to process the valve valve housing, thereby preventing the wear of the valve valve housing has the effect of extending the life and reliability of the compressor.

Claims (2)

An upper open type check valve housing positioned above the discharge port in the discharge chamber to block the reverse flow of the discharge gas; A shock valve sliding up and down in the shock valve housing; The reverse rotation prevention mechanism of the scroll compressor, which regulates the movement of the check valve and is formed with a discharge cover which is formed with a passage of compressed gas and is divided into a suction chamber and a discharge chamber. The method of claim 1, The discharge cover has a reverse rotation preventing structure of the scroll compressor, characterized in that a plurality of flow paths are formed on the outer side with respect to the center of the valve.