KR20010076888A - Apparatus for preventing vacuum compression of scroll compressor - Google Patents

Abstract

PURPOSE: A vacuum compression prevention apparatus for scroll compressor is provided to achieve an in-advance prevention against damage to hermetic terminal caused by a vacuum compression resulting from the vacuumization of the low pressure side. CONSTITUTION: A swirling scroll(6) and a fixed scroll(10) which form a plurality of compression chambers are arranged in a casing(1) which is divided into a suction pressure area(Sl) and a discharge pressure area(Sh). Each of compression chambers has different pressure and changes position during the turning motion of the rotary scroll. A non-return valve assembly constituted by a non-return valve(22) for cutting the back flow of the discharged gas, and a valve housing(21) accommodating the non-return valve is disposed in the discharge pressure area of the casing. The valve housing has a gas flow hole formed at the bottom surface of the valve housing and which is open/closed by the non-return valve. The gas flow hole is communicated to a gas passage port(21b) which is communicated to the suction pressure area of the casing.

Description

Vacuum Compression Prevention Device of Scroll Compressor {APPARATUS FOR PREVENTING VACUUM COMPRESSION OF SCROLL COMPRESSOR}

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a vacuum compression preventing device for a scroll compressor, and more particularly, to a vacuum compression preventing device for a scroll compressor that prevents vacuum compression of a suction pressure region during pumping down in a low pressure scroll compressor.

Generally, a compressor converts mechanical energy into compressive energy of a compressive fluid, which is divided into reciprocating, scrolling, and centrifugal (commonly referred to as turbo) and vane (commonly referred to as rotary). .

Among the scroll compressors, unlike the reciprocating type using the linear motion of the piston, the scroll compressor sucks and discharges the gas by using a rotating body such as a centrifugal type or a vane type. The scroll compressor is divided into a low pressure scroll compressor or a high pressure scroll compressor depending on whether suction gas or discharge gas is filled in the casing.

In the low pressure scroll compressor, as shown in FIG. 1, the upper frame 2 and the lower frame 3 are respectively fixed to upper and lower sides of the inner circumferential surface of the casing 1 filled with oil to an appropriate height, and the upper frame 2 A driving motor 4 consisting of a stator 4A and a rotor 4B is fixedly installed between the lower frame 3 and the lower frame 3, and a driving shaft 5 is formed at the center of the rotor 4B of the driving motor 4. The pivoting frame 6 is press-fitted through the upper frame 2, and the upper frame 2 is formed on the upper surface with a wrap 6a in an involute curve to be eccentrically coupled to the drive shaft 5. A fixed scroll which is rotatably mounted and provided with an involute curve wrap 7a formed on the upper surface of the swing scroll 6 to be engaged with the wrap 6a of the swing scroll 6 to form a plurality of compression chambers ( 7) is fixed to the edge of the upper frame (2), the casing (top) of the fixed scroll (7) 1) A high and low pressure separator 8 partitioning the inside into a discharge pressure region as a high pressure portion and a suction pressure region as a low pressure portion is fixed to an inner circumferential surface of the casing 1.

At one outer periphery of the fixed scroll (7) is formed a suction groove (7b) in communication with the suction pipe (SP) to the inside of the outermost wrap, the center of the fixed scroll (7) is in communication with the discharge pipe (DP) A discharge port 7c is formed, and a check valve assembly 9 for opening and closing the discharge port 7c is provided at the front end surface of the fixed scroll 7.

In the figure, 5a, which is not described, is an oil oil, and 8a is a gas discharge hole.

The conventional scroll compressor configured as described above operates as follows.

That is, while the rotor 4B rotates together with the drive shaft 5 inside the stator 4A by the applied power, the turning scroll 6 is rotated by an eccentric distance, and the turning scroll 6 ) Is rotated at a distance away from the center of gravity by the Old Daming (unsigned) as the turning radius, and a plurality of compression chambers are formed between the two wraps 6a and 7a with the fixed scroll 7, This compression chamber is reduced in volume while moving to the center by the continuous turning motion of the turning scroll 6 to further compress and discharge the sucked refrigerant gas.

Looking at this in more detail, the suction gas filled in the suction pressure region of the casing 1 through the suction pipe (SP) through the suction groove (7b) of the fixed scroll (7) opened during the swinging movement of the swinging scroll (6) The suction gas is sucked into the outer compression chamber, and the suction gas is gradually compressed along the compression chamber and discharged through the discharge port 7c to the discharge pressure region, which discharges the gas while the check valve assembly 9 is opened. The gas is discharged to the refrigeration cycle system through the gaseous discharge hole 8a of the low pressure separating plate 8 and the discharge pipe DP.

At this time, the check valve assembly 9 is kept open by the high-pressure discharge gas continuously discharged from the compression chamber during the normal operation of the compressor, but during the abnormal operation of the compressor (over-compression or high vacuum operation) discharge chamber As the pressure of the pressure becomes relatively higher than that of the compression chamber, the check valve assembly 9B blocks the discharge port 7a of the fixed scroll 7 to prevent the reverse flow of the discharge gas.

However, during the overcompression operation caused by other factors during the operation of the compressor or during the pump-down operation in which the service (suction) valve is closed, all refrigerant gas remaining in the suction pressure region is sucked into the compression chamber and discharged to the discharge pressure region. As a result of the discharge, the suction pressure region of the casing 1 as well as the compression chamber gradually become a vacuum state. If such abnormal operation is continued for a long time, the vacuum of the suction pressure region and the compression chamber is accelerated and the hermetic terminal is formed by vacuum compression. ) (Not shown) is damaged, or the tip chamber and the like is damaged by recompression at the compression mechanism portion, resulting in a problem that the reliability of the compressor is lowered.

The present invention has been made in view of the above problems of the conventional low pressure scroll compressor, and an object thereof is to provide a vacuum compressor preventing apparatus for a scroll compressor which can prevent the suction pressure region from being highly vacuumed during operation of the compressor. .

1 is a longitudinal sectional view showing an example of a conventional scroll compressor.

Figure 2 is a longitudinal sectional view showing a part of a scroll compressor provided with a vacuum compression preventing device of the present invention.

Figure 3a is a bottom view showing the check valve assembly of the scroll compressor of the present invention.

FIG. 3B is a sectional view taken along the line "I-I" in FIG. 3A;

Figures 4a and 4b is a partial longitudinal cross-sectional view of each of the normal operation and abnormal operation (high vacuum operation) in the scroll compressor equipped with the vacuum compression prevention device of the present invention.

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

10: fixed scroll 12: discharge port

13 exhaust hole 14 suction groove

20: check valve assembly 20a: backflow prevention hole

21: valve housing 21A: guide support

21B: stopper portion 21a: gas flow groove

21b: gas port 22: check valve

30 connector

In order to achieve the object of the present invention, there is provided a fixed scroll for forming a plurality of compression chambers together with the turning scroll and its turning scroll in the casing divided into the suction pressure region and the discharge pressure region, A scroll compressor in which the compression chamber is configured to move continuously while having different pressures; A check valve assembly including a check valve and a valve housing in which the check valve is slidably received is disposed in the discharge pressure region to block the reverse flow of the discharge gas.

The valve housing has a gas flow path groove which is opened and closed by a check valve at a bottom thereof, and the gas flow path groove communicates with a gas passage communicating with the suction pressure region of the casing. Is provided.

Hereinafter, a vacuum compression prevention device of a scroll compressor according to the present invention will be described in detail with reference to an embodiment shown in the accompanying drawings.

Figure 2 is a longitudinal sectional view showing a part of a scroll compressor equipped with the vacuum compression preventing device of the present invention, Figure 3a is a bottom view showing a check valve assembly of the scroll compressor of the present invention, Figure 3b is "I-I" of Figure 3a Line cross section.

As shown in the low-pressure scroll compressor equipped with a vacuum compression preventing device according to the present invention, the fixed scroll 10 is fixed to the upper frame (2) fixed inside the casing (1), the fixed scroll ( 10, together with the rotating scroll 6 forming a plurality of compression chambers together with the drive shaft 5 of the rotor (not shown) of the drive motor (not shown) mounted on the casing 1, the upper frame described above. A high and low pressure separating plate 8 which is mounted on (2) and divides the inside of the casing 1 into the suction pressure region S _l and the discharge pressure region S _h on the upper side of the fixed scroll 10 is casing. It is fixed to (1), the discharge port 12 of the fixed scroll 10 is configured to include a check valve assembly 20 is installed to prevent the back flow of the discharge gas.

The fixed scroll 10 has an exhaust hole 13 extending in a rectangular shape from the rear side of the discharge pressure area, which is a high pressure part, to the outer circumferential surface side of the suction pressure area, which is a low pressure part, and the low pressure part side end of the exhaust hole 13 It is formed to communicate with the suction groove 14 provided in the fixed scroll (10).

The check valve assembly 20 is inserted into the valve housing 21 and the valve housing 21 fixed to the back by receiving the discharge port 12 of the fixed scroll 10 in the operating state of the compressor Accordingly, the check valve 22 includes a disc shaped check valve 22 that opens and closes the discharge port 12.

The valve housing 21 is formed to guide the sliding movement of the check valve and to form a plurality of guide supports 21A for forming a discharge port (unsigned) and an upper end of the guide supports 21A. It consists of a stopper part 21B which limits the opening degree of the check valve 22.

On the bottom of the stopper portion 21B, a gas flow path groove 21a is formed to be opened and closed by the check valve 22, and the gas flow path groove 21a communicates with the gas flow path groove 21a inside the stopper part to exhaust the exhaust hole of the fixed scroll 10. A gas cylinder 21b communicating with the connecting pipe 30 is formed through the outer circumferential surface thereof.

In the drawings, the same reference numerals are given to the same parts as in the prior art.

In the figure, reference numeral 5 denotes a drive shaft, 8a denotes a gas outlet, 6a denotes a lap of a rotating scroll, 11 denotes a lap of a fixed scroll, 20a denotes a backflow prevention hole, DP denotes a discharge tube, and SP denotes a suction tube.

The general operation of the low-pressure scroll compressor with a vacuum compression preventing device according to the present invention configured as described above is similar to the conventional.

That is, while the driving shaft 5 rotates together with the rotor 4B rotating by the applied power, the turning scroll 6 is rotated by an eccentric distance, but the turning scroll 6 is pivoting about the axis center. at a distance as much as the radius becomes a turning motion which while a plurality of compression chambers formed between the two wraps (6a, 11) of the fixed scroll (10) is filled in the suction pressure area (S _l) of the casing (1) refrigerant The gas is sucked and compressed to be discharged to the discharge port 12 of the fixed scroll 10.

At this time, during normal operation of the compressor, the check valve 22 slides along the guide supports 21A and 21A of the valve housing 21 by the discharge gas discharged through the discharge port 12, and the upper surface thereof rises. Since the check valve 22 closes the inner bottom surface of the stopper part 21B of the housing 21, and thus the check valve 22 blocks the gas flow path groove 21 a provided in the inner bottom face of the stopper part 21B of the valve housing 21. The discharge gas of the discharge pressure region S _{h, which} is the high pressure portion, is blocked from being carried into the suction pressure region S _l , which is the low pressure portion, and the discharge gas is not flowed back into the suction pressure region S _l , but is discharged through the discharge pipe DP. All discharged.

On the other hand, during the high pressure ratio or the pump down of the compressor, all of the refrigerant gas in the suction pressure region S _l including the compression chamber is discharged to the discharge pressure region S _h so that the compression chamber is in a vacuum state. The check valve 22 slides down along the guide support portion 21A of the valve housing 21 to block the discharge port 12 of the fixed scroll 10, and the gas flow path groove 21a opens to discharge the discharge gas. A part flows into the gas passage 21b along the gas flow path 21a, and the discharge gas flowing into the gas passage 21b opens the exhaust hole 13 of the connecting pipe 30 and the fixed scroll 10. The vacuum is released while being sucked into the compression chamber through the suction pressure region S ₁ .

If the power is not turned off during the vacuum compression of the compressor, the drive motor (unsigned) of the compressor is continuously rotated, and the compressor is vacuum compressed again, and the vacuum compression state is released by the vacuum preventing means. While repeating the operation of the valve member 22 is a continuous reciprocating motion at a predetermined frequency in the valve housing 21.

In this way, it is possible to prevent the pressure on the low pressure side, including the compression chamber, from being in a vacuum state, thereby preventing damage to the hermetic terminal due to vacuum compression, and to prevent deterioration of components generated during recompression of the compression mechanism. As a result, the deterioration of the reliability of the compressor can be prevented.

In the vacuum compressor preventing device of the scroll compressor according to the present invention, a gas flow path groove is formed on the bottom of the valve housing of the check valve assembly to be opened during the closing operation of the check valve, and the inside of the valve housing communicates with the gas flow path groove. A gas passage is formed through the inside of the fixed scroll, and the suction pressure region and the discharge pressure region of the casing communicate with each other, and an exhaust hole communicating with the gas passage and the connection pipe is formed therethrough. It is possible to prevent the damage of the hermetic terminal due to the vacuum compression generated while, and to prevent the deterioration of the components due to the recompression of the compression mechanism and thereby the reliability of the compressor.

Claims (2)

In the casing divided into the suction pressure region and the discharge pressure region, there is a fixed scroll which forms a plurality of compression chambers together with the turning scroll and the turning scroll, and each compression chamber has a different pressure during the turning of the turning scroll. A scroll compressor configured to move a position continuously; A check valve assembly including a check valve and a valve housing in which the check valve is slidably received is disposed in the discharge pressure region to block the reverse flow of the discharge gas. The valve housing has a gas flow path groove which is opened and closed by a check valve at a bottom thereof, and the gas flow path groove communicates with a gas passage communicating with the suction pressure region of the casing. . According to claim 1, wherein the valve housing is fixed to accommodate the discharge port provided in the fixed scroll, the discharge port of the fixed scroll is formed with an exhaust hole for communicating the discharge pressure region and the suction pressure region, the exhaust hole And a connecting pipe communicating with the gas passage end of the valve housing at the discharge pressure side end of the valve housing.