KR100308305B1 - Apparatus for preventing gas antiflow of scroll compressor - Google Patents

Abstract

The present invention relates to a gas backflow prevention device of a scroll compressor, wherein the oil is separated from the discharge gas when the compressor is stopped so that the filtered oil blocks the discharge port together with the check valve, and then the check valve that opens rapidly when the compressor is restarted. By being configured to be buffered by the oil, even if the pressure ratio of the refrigerant gas increases, it is possible to minimize the discharge of the discharged gas back to the compression chamber, it is possible to reduce the collision noise by the check valve when restarting the compressor.

Description

Gas backflow prevention device of scroll compressor {APPARATUS FOR PREVENTING GAS ANTIFLOW OF SCROLL COMPRESSOR}

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a gas backflow preventing device of a scroll compressor, and more particularly, to a gas backflow preventing device of a scroll compressor suitable for minimizing noise generated while the discharge gas flows back into the compression chamber.

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 turning 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 fixedly installed on the edge of the upper frame (2), the casing (1) on the upper side of the fixed scroll (7) The discharge cover 8 which divides the inside into the high pressure part and the low pressure part is fixed to the inner peripheral surface of the casing 1, and the check valve assembly which prevents the backflow of discharge gas in the upper surface of the gaseous discharge hole 8a of the discharge cover 8 is carried out. (9) is installed.

The check valve assembly 9 slides inside the valve housing 9A and the valve housing 9A fastened with a predetermined volume to embrace the gaseous discharge hole 8a on the upper surface of the discharge cover 8. Consists of a check valve (9B) for opening and closing the gas discharge hole (8a) while moving up and down.

In the figure, 5a denotes an oil flow passage, 7b denotes a discharge port, SP denotes a suction tube, and DP denotes a discharge tube.

The scroll compressor configured as described above is operated 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 eccentrically rotated by an eccentric distance, and the turning scroll ( 6) is rotated at a distance separated by the turning radius from the origin of the axis by the Old Daming (unsigned), and a plurality of compression chambers are formed between the two wraps 6a and 7a with the fixed scroll 7. . The compression chamber is moved to the center by the continuous turning movement of the turning scroll 6 to reduce the volume to further compress the sucked refrigerant gas, and the compressed high-pressure refrigerant gas is discharged from the fixed scroll 7. The liquid is discharged to the inside of the discharge cover 8 through 7b) and then discharged to the outside of the compressor via the gaseous discharge hole 8a and the discharge pipe DP of the discharge cover 8.

At this time, the check valve (9B) is maintained in close contact with the inner bottom surface of the valve housing (9A) by the high-pressure discharge gas during the normal operation of the compressor, the self-weight and the check valve of the check valve (9B) when the compressor is stopped The gas discharge hole 8a of the discharge cover 8 was blocked while gradually descending by the pressure of the discharge gas remaining in the casing 1.

However, when the pressure ratio is increased in the check valve assembly of the conventional scroll compressor as described above, the residual pressure of the discharge gas becomes relatively high compared to the suction pressure during the suction stroke of the compressor, so that the check valve 9B is pressed. There was a problem in that the closing speed of the check valve 9B was slow or the behavior was unstable, resulting in reverse flow of the discharge gas.

In addition, when the compressor is restarted, the pressure in the compression chamber suddenly increases, and the check valve 9B on which the discharge cover 8 is seated is suddenly pushed out, and the impact noise is generated by a strong collision with the inner bottom of the valve housing 9A. There was also a problem.

The present invention has been made in view of the above problems of the conventional scroll compressor, and to provide a check valve assembly of the scroll compressor that can minimize the discharge of the discharged gas back to the compression chamber even if the pressure ratio of the refrigerant gas increases. There is a purpose.

In addition, the present invention provides a check valve assembly of a scroll compressor that can prevent a collision noise generated when the check valve hits the valve housing during the refrigerant gas discharged from the compression chamber to push up the check valve upon restarting the compressor. There is an object of the invention.

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

Figure 2 is a longitudinal sectional view showing the operation of the check valve assembly in a conventional scroll compressor.

Figure 3 is a longitudinal sectional view showing the scroll compressor of the present invention.

Figure 4 is a longitudinal sectional view showing a gas backflow prevention device of the scroll compressor of the present invention.

5 is a cross-sectional view taken along the line 'I-I' of FIG.

Figure 6 is a perspective view of the reticular member in the gas backflow prevention apparatus of the present invention scroll compressor.

7a and 7b is a longitudinal sectional view showing the operation of the gas backflow prevention device in the scroll compressor of the present invention.

Explanation of symbols on the main parts of the drawings

7: Fixed scroll 7b: Discharge port

7c: inclined surface 8: discharge cover

10 check valve assembly 11 reticular

12 cover plate 13 check valve

14: guide rod 15: stop plate

In order to achieve the object of the present invention, a discharge port communicating with the compression chamber is vertically penetrated in the fixed scroll constituting the compression chamber together with the turning scroll, the oil is separated from the discharge gas discharged through the discharge port of the compressor Check valve assembly to block the discharge port with the oil when the stop is mounted on the back of the fixed scroll,

The check valve assembly is installed on the rear surface of the fixed scroll to remove the oil from the discharge gas, and the inside of the network member is installed inside the mesh member to block the discharge port when the compressor is stopped to form an oil film in the discharge port A valve member adapted to guide the valve member, the guide member being fixed to the rear surface of the fixed scroll so as to be in sliding contact with the rim surface of the valve member, and a stop coupled to the end of the guide member to limit the opening degree of the valve member. A gas backflow preventing device for a scroll compressor, comprising a member, is provided.

Hereinafter, a gas backflow prevention apparatus 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 3 is a longitudinal sectional view showing a scroll compressor of the present invention, Figure 4 is a longitudinal sectional view showing a gas backflow prevention device of the scroll compressor of the present invention, Figure 5 is a cross-sectional view taken along the line 'I-I' of Figure 4, Figure 6 The present invention is a perspective view showing a reticular member in the gas backflow prevention device of the scroll compressor.

As shown in the scroll compressor having a gas backflow prevention apparatus according to the present invention, the upper frame 2 and the lower frame 3 are fixed to the upper and lower sides of the drive motor 4, respectively, inside the casing 1. The drive shaft 5 penetrates the upper frame 2 into the rotor 4B of the drive motor 4, and wraps the upper end of the drive shaft 5 in an involute curve with a wrap 6a. ) Is formed and the swinging scroll (6) is mounted so as to slide on the upper surface of the upper frame (2), the upper surface of the swinging scroll (6) is engaged with the wrap (6a) of the swinging scroll (6) a plurality The fixed scroll 7 is formed by fastening to the edge of the upper frame 2, the fixed scroll (7) formed of the involute curve (7a) to form two compression chambers, the upper side of the fixed scroll (7) inside the casing (1) A discharge cover 8 for dividing the pressure into a high pressure portion and a low pressure portion, and is provided on the rear surface of the fixed scroll 7. The check valve assembly 10 is installed to separate the oil from the discharge gas to prevent the reverse flow of the discharge gas with the oil.

The check valve assembly 10 includes an annular network cylinder 11 for separating oil from discharge gas, a cover plate 12 for covering an upper surface of the network cylinder 11, and the network cylinder 11. The check valve 13 which opens and closes the discharge port 7b together with the filtered oil disposed inward, and at least three points of sliding contact with the rim surface of the check valve 13 is fixed to the rear surface of the fixed scroll 7. It consists of a guide rod 14 and a stop plate 15 coupled to the end of the guide rod 14 to limit the opening degree of the check valve 13.

The rear surface of the fixed scroll 7 is preferably formed with an inclined surface 7c deeper toward the discharge port 7b so that the oil filtered by the reticular member collects around the discharge port 7b.

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

In the figure, 5a denotes an oil flow passage, 7b denotes a discharge port, SP denotes a suction tube, and DP denotes a discharge tube.

The gas backflow prevention apparatus of the scroll compressor according to the present invention configured as described above is operated as follows.

That is, while the drive shaft 5 rotates together with the rotor 4B rotating by the applied power source, the turning scroll 6 is eccentrically rotated by an eccentric distance, but the turning scroll 6 is an old dam ring (unsigned). By the turning center at the distance from the shaft center to the turning radius, a plurality of compression chambers are formed between the two wraps (6a, 7a) with the fixed scroll (7) while sucking the refrigerant gas and fixed scroll It discharges to the discharge port 7b of (7).

On the other hand, the compressed gas contains a certain amount of oil is discharged into the discharge cover (8) while pushing the check valve 13 with the gas at the time of discharge, of which the gas passes through the network (11) While the oil is discharged to the refrigeration cycle device, the oil is caught by the network box 11 and accumulated around the discharge port 7b so that the check valve 13 is locked along the inclined surface 7c of the fixed scroll 7.

At this time, when the compressor is stopped while the check valve 13 is immersed in oil, the check valve 13 descends together with the oil to block the discharge port 7b of the fixed scroll 7. The oil flowed back to the port 7b is left in the discharge port 7b while forming the oil film like the straw phenomenon because the check valve 13 blocks the outlet end of the discharge port 7b. That is, even when the check valve 13 has not completely blocked the discharge port 7b when the compressor is stopped, the gas flowing back is caught by the incompressible oil and no longer flows back into the compression chamber.

Thereafter, even when the compressed gas of high pressure is suddenly discharged through the discharge port 7b when the compressor is restarted, the pump pushes up the check valve 13 strongly, but the upper surface of the check valve 13 is filled with oil so that the check valve It is to prevent 13 from colliding with the stop plate 15.

The gas backflow prevention apparatus of the scroll compressor according to the present invention is to separate the oil from the discharge gas when the compressor is stopped so that the filtered oil shuts off the discharge port together with the check valve, and then the check valve is opened rapidly when the compressor is restarted. By being configured to be buffered by one oil, even if the pressure ratio of the refrigerant gas increases, it is possible to minimize the discharge of the discharged gas back to the compression chamber, it is possible to reduce the collision noise by the check valve when the compressor restarts.

Claims (2)

A discharge port communicating with the compression chamber is vertically formed in the fixed scroll which forms the compression chamber together with the turning scroll, and the oil is separated from the discharge gas discharged through the discharge port to discharge the oil together with the oil when the compressor is stopped. Check valve assembly to block the port is mounted on the back of the fixed scroll, The check valve assembly is installed on the rear surface of the fixed scroll to remove the oil from the discharge gas, and the inside of the network member is installed inside the mesh member to block the discharge port when the compressor is stopped to form an oil film in the discharge port A valve member adapted to guide the valve member, the guide member being fixed to the rear surface of the fixed scroll so as to be in sliding contact with the rim surface of the valve member, and a stop coupled to the end of the guide member to limit the opening degree of the valve member. A gas backflow preventing device of a scroll compressor, comprising a member. The apparatus of claim 1, wherein the back surface of the fixed scroll is formed with an inclined surface deeper toward the discharge port so that oil filtered by the reticular member accumulates around the discharge port.