KR20010076882A - 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. CONSTITUTION: An apparatus comprises a valve housing(110) arranged to be communicated to a suction pressure area(Sl), intermediate pressure area(Sm) and a discharge pressure area(Sh) of a casing; a valve member(120) inserted in a slidable manner into the inner periphery of the valve housing, and which moves in accordance with the pressure change of the intermediate pressure area caused by the operation of the compressor and allows the suction pressure area and the discharge pressure area to be communicated with each other or cut off from each other; and an elastic member(130) interposed between the valve member and the valve housing, and which reinforces motion of the valve member. The valve housing has a suction pressure space(111) and an intermediate pressure space(112) which are sectioned by the valve member, thus forming a vertical movement space for valve.

Description

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

The present invention relates to an apparatus for preventing vacuum compression of a scroll compressor, and more particularly, to an apparatus for preventing vacuum compression of a scroll compressor that blocks the vacuum compression of the compressor by using an intermediate pressure.

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 problems of the conventional low-pressure scroll compressor as described above, to provide a vacuum compressor preventing device of the scroll compressor that can prevent the suction pressure region is highly vacuumed during operation of the compressor. have.

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

Figure 2 is a partial longitudinal cross-sectional view showing an example of a scroll compressor with a vacuum compression prevention device of the present invention.

Figure 3 is a plan view of a fixed scroll of the scroll compressor equipped with a vacuum compression prevention device of the present invention.

4 is an enlarged view showing detail "A" of FIG.

Figures 5a and 5b is a partial longitudinal cross-sectional view for the normal operation in the scroll compressor equipped with a vacuum compression preventing device of the present invention and a degree of freedom for the vacuum compression preventing device.

6A and 6B are partial longitudinal cross-sectional views for abnormal operation (high vacuum operation) in a scroll compressor equipped with the vacuum compression preventing device of the present invention and degrees of freedom for the vacuum compression preventing device.

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

1: casing 6: turning scroll

6a: lap of turning scroll 10: fixed scroll

11: wrap of fixed scroll 12; Suction groove

13: discharge port 100: high vacuum prevention means

110: valve housing 111: suction pressure space

111a: suction gas side gas hole 112: intermediate pressure space

112a: intermediate pressure side gas hole 113a, 113b: discharge pressure side gas hole

120: valve member 130: elastic member

140: valve catching portion S _l : suction pressure range

S _m : Medium pressure region S _h : Discharge pressure region

In order to achieve the object of the present invention, there is provided a scroll compressor including a fixed scroll to form a rotating scroll and a plurality of compression chambers continuously positioned at different pressures when the rotating scroll is rotated in the casing;

The valve housing is provided so that the suction pressure region, the intermediate pressure region and the discharge pressure region of the casing communicate with each other, and is inserted into sliding contact with the inner circumferential surface of the valve housing, and moves in accordance with the pressure change of the intermediate pressure region according to the operation state of the compressor. It is composed of a valve member for communicating or blocking the suction pressure region and the discharge pressure region with each other, and an elastic member interposed between the valve housing to support the valve member to reinforce the movement of the valve member,

The valve housing is provided with a vacuum compressor preventing device of a scroll compressor, characterized in that the left and right sides of the valve housing are divided into a suction pressure space and an intermediate pressure space by the valve member to have a valve flow space in the transverse direction.

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.

2 is a partial longitudinal cross-sectional view showing an example of a scroll compressor with a vacuum compression preventing device of the present invention, Figure 3 is a plan view of a fixed scroll of the scroll compressor with a vacuum compression preventing device of the present invention, Figure 4 is This is an enlarged view showing the "A" part in detail.

As shown therein, the low-pressure scroll compressor equipped with the vacuum compression preventing device according to the present invention includes a fixed scroll (10) having a high vacuum preventing means (100) on the upper frame (2) fixed inside the casing (1). ) Is fixed, and a rotating scroll (6) forming a plurality of compression chambers together with the fixed scroll (10) is driven by a rotor (not shown) of a rotor (not shown) of a drive motor (not shown) mounted to the casing (1). 5) is integrated into the upper frame (2), and partitions the inside of the casing (1) into the suction pressure region (S _l ) and discharge pressure region (S _h ) on the upper side of the fixed scroll (10). The high and low pressure separating plate 8 is fixed to the casing 1, and the check valve assembly 9 is installed at the front end surface of the discharge port 13 of the fixed scroll 10 to prevent the backflow of the discharge gas. It is composed.

The high vacuum preventing means 100 is inserted into the valve housing 110 formed in the fixed scroll 10 and the valve housing 110 to slide in the suction pressure region S _l of the casing 1. An elastic force for sliding of the valve member 120 interposed between the valve member 120 and the valve housing 110 and the valve member 120 for communicating or blocking the discharge pressure region S _h with each other. It consists of an elastic member 130 for adding.

The valve housing 110 is formed as a valve flow space in the transverse direction so that the left and right sides thereof are respectively divided into the suction pressure space 111 and the intermediate pressure space 112 by the valve member 120, the suction pressure region ( 111), one side surface, the suction pressure area (S _l) suction apcheuk gas hole (111a) in communication with the casing (1) is formed, the main surface, the intermediate pressure region of the casing (1) of the intermediate pressure region (112) An intermediate pressure side gas hole 112a communicating with S _m is formed, and a discharge pressure side gas hole communicated with the discharge pressure region S _h of the casing 1 and opened and closed by the valve member 120 on its main surface. 113a and 113b are formed opposite to each other.

C-rings on the inner circumferential surface of the valve housing 110 to prevent the intermediate pressure side gas hole 112a from being blocked by the valve member 120 in the intermediate pressure space 112 of the valve housing 110. 140 is inserted or fixed, or the locking step (not shown) is formed to protrude.

The suction pressure side gas hole 111a is formed through the outer circumferential surface of the fixed scroll 10, and the intermediate pressure side gas hole 112a is the intermediate pressure in the plurality of compression chambers including the turning scroll 6 and the fixed scroll 10. It is formed through the intermediate pressure chamber forming the area (S _m ), the discharge pressure side gas hole (113a, 113b) is formed through the back of the fixed scroll 10 and the discharge port 13, respectively.

The valve member 120 is inserted in sliding contact with the inner circumferential surface of the valve housing 110, and an O-ring (not shown) for sealing with the valve housing 110 is inserted into the outer circumferential surface thereof.

The elastic member 130 may be interposed in the suction pressure space 111 of the valve housing 110 by a compression coil spring, or may be further interposed in the intermediate pressure space 112 of the valve housing 110.

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

In the figure, reference numeral 6a denotes a lap of the turning scroll, 11 a lap of the fixed scroll, and 12 a suction groove.

The general operation of the scroll compressor provided with the vacuum compression preventing device of the present invention as described above is similar to the conventional.

That is, while the driving shaft 5 rotates together with the rotor (not shown) of the motor rotated by the applied power, the turning scroll 6 is rotated by an eccentric distance, but the turning scroll 6 rotates the shaft center. The suction movement is made at a distance as far as the turning radius from the origin, so that a plurality of compression chambers are formed between the two wraps 6a and 11 with the fixed scroll 10, and the suction pressure region S _{l as} the low pressure portion of the casing 1 is formed. The refrigerant gas filled in is sucked and compressed to be discharged to the discharge port 13 of the fixed scroll 10.

5A and 5B, in the normal operation of the compressor, the refrigerant gas flows into the intermediate pressure space 112 of the valve housing 110 through the intermediate pressure side gas hole 112a and the valve member 130. Since the pressure is applied to the intermediate pressure negative pressure surface of the valve member 120, the pressure force (P _m × A) applied to the intermediate pressure negative pressure surface of the valve member 120 is applied to the elastic force of the elastic member 130 (F _k ) And the valve member 120 discharges the discharge pressure side gas hole (or, together with the other suction pressure side gas hole) 113a in equilibrium with the sum of the pressure loads P ₁ × A of the suction pressure region S ₁ . Will block. Through this, the high pressure gas of the discharge pressure region S _h flows into the suction pressure space 111 of the valve housing 110 through the discharge pressure side gas holes 113a and 113b, and then opens the suction pressure side gas hole 111a. Through this, it is possible to prevent backflow into the suction pressure region S ₁ .

On the other hand, as shown in FIGS. 6A and 6B, when the compressor is overcompressed or pumped down, all of the refrigerant gas in the suction pressure region S ₁ including the compression chamber is discharged to the discharge pressure region S _h . The intermediate pressure chamber of the compression chamber as well as the intermediate pressure space 112 of the valve housing 110 are in a vacuum state, and the pressure load (P _m × A) applied to the intermediate pressure negative pressure surface of the valve member 120 It becomes smaller than the combined force of the elastic force (F _k ) of the elastic member 130 and the pressure load (P _l × A) of the suction pressure region (S _l ) applied to the rear surface of the valve member 120 is the ring The discharge pressure side gas holes 113a and 113b are opened while being pushed to 140 or the locking step (not shown), and at the same time, a part of the discharge gas in the discharge pressure region S _h is discharge pressure side gas holes 113a and 113b. Inflow into the suction pressure space 111 of the valve housing 110 through the suction pressure region (through the suction gas side gas hole 111) It is, to reverse flow into the suction chamber pressure directly) (S _l) a vacuum of the compressor is released.

Then, the elastic force of the valve member 120 is a suction pressure zone the suction pressure area (S _l) a pressure load (P _l × A) with the resilient member 130 of the by the refrigerant gas to be introduced into the (S _l) (F _k ), The suction pressure side gas hole 111a and the discharge pressure side gas holes 113a and 113b are again blocked while being pushed back into the suction pressure space 111.

On the other hand, if the power is not turned off during the vacuum compression of such a compressor, the drive motor (unsigned) of the compressor is continuously rotated, and the compressor is vacuum compressed again. The valve member 120 is continuously reciprocated at a predetermined frequency in the valve housing 110 while repeating a series of operations in which the state is released.

In this way, it is possible to prevent the compression chamber including the suction pressure region of the casing from being in a vacuum state, thereby preventing damage to the hermetic terminal due to vacuum compression, and also to deteriorate components generated during recompression of the compression mechanism. And thereby the reliability of the compressor can be prevented in advance.

The apparatus for preventing vacuum compression of a scroll compressor according to the present invention includes a valve flow space in a horizontal direction so that the suction pressure region, the intermediate pressure region and the discharge pressure region of the casing communicate with each other and have suction pressure spaces and intermediate pressure spaces on both left and right sides thereof. Inserted into the valve housing and the inner circumferential surface of the valve housing and sliding in the valve housing in accordance with the pressure change of the intermediate pressure region according to the operating state of the compressor to communicate the suction pressure region and the discharge pressure region with each other, or By constructing the valve member to shut off and the elastic member interposed between the valve member and the valve housing, it is possible to prevent damage to the hermetic terminal due to the vacuum compression generated when the suction pressure region is vacuumed, The deterioration of parts due to recompression of the compression mechanism and the deterioration of the reliability of the compressor can be prevented.

Claims (1)

A scroll compressor including a fixed scroll configured to form a revolving scroll and a plurality of compression chambers continuously positioned at different pressures when the revolving scroll revolves. A valve housing provided so that the suction pressure region, the intermediate pressure region and the discharge pressure region of the casing communicate with each other; A valve member inserted in sliding contact with the inner circumferential surface of the valve housing to communicate or block the suction pressure region and the discharge pressure region while moving in response to a pressure change in the intermediate pressure region according to the operation state of the compressor; It is composed of an elastic member interposed between the valve housing to support the valve member to reinforce the movement of the valve member, The valve housing is a vacuum compressor preventing device of a scroll compressor, characterized in that the left and right sides of the valve housing is divided into a suction pressure space and an intermediate pressure space by the valve member to have a valve flow space in the transverse direction.