KR100397562B1 - Apparatus for preventing vacuum compression of scroll compressor - Google Patents

Abstract

The present invention relates to a vacuum compression preventing device of a scroll compressor, the present invention relates to a casing that is divided into a suction pressure region and a discharge pressure region, the swinging scroll to rotate in the casing, and the scrolling scroll in succession A plurality of compression chambers and a fixed scroll for penetrating the bypass hole to communicate the discharge pressure area to the suction pressure area, a valve housing fixed to the fixed scroll to accommodate the discharge hole, and a valve housing for opening and closing the discharge hole. A check valve that slides into the inside of the valve, a bypass valve that is mounted on a fixed scroll to open and close the bypass hole, which opens when the check valve is closed, and guides a part of the compressed gas in the discharge pressure region to the suction pressure region, One end is engaged, while the other end is coupled to the bypass valve, By including the interlocking means for opening and closing the bypass valve, a part of the compressed gas discharged into the discharge pressure region during the abnormal operation of the compressor is carried into the suction pressure region to prevent high vacuum due to the lack of gas in the compression chamber, Through this, it is possible to prevent the hermetic terminal from being burned or damaged due to deterioration of the tip chamber and the like, thereby reducing the reliability of the compressor.

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, which is mechanically provided to minimize noise when stopped.

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, main frames 2 and subframes 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 main frames 2 are respectively fixed. ) And a drive motor (4) consisting of a stator (4A) and a rotor (4B) is fixedly installed between the subframe (3) and the center of the rotor (4B) of the drive motor (4). The pivoting frame 6 is press-fitted through the main frame 2, and the main frame 2 is formed with an involute curve on the upper surface thereof to form a wrap 6a so as 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 main frame (2), the casing (1) on the upper side of the fixed scroll (7) The high and low pressure separating plate 8 partitioning the inside into the discharge pressure region S1 serving as the high pressure portion and the suction pressure region S2 serving as the low pressure portion is fixed to the 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 hole 7c is formed, and a check valve assembly 9 for opening and closing the discharge hole 7c is provided at the front end surface of the fixed scroll 7.

In the drawings, reference numeral 9A denotes a valve housing and 9B denotes a check valve.

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 an applied power source, the turning scroll 6 is eccentrically rotated by an eccentric distance, and the turning scroll ( 6) is rotated by the distance from the center of the shaft by the Old Daming (unsigned) as the turning radius, and a plurality of compression chambers are formed between the two wraps (6a, 7a) with the fixed scroll (7). This compression chamber is moved to the center by the continuous turning motion of the turning scroll 6 to reduce the volume to further compress and discharge the sucked refrigerant gas.

At this time, in the normal operation of the compressor, the check valve 9B is kept open by the high-pressure discharge gas continuously discharged from the compression chamber, but in the abnormal operation of the compressor (over compression or high vacuum operation), the discharge pressure range is maintained. As the pressure of S1 becomes higher than that of the compression chamber, the check valve 9B blocks the discharge hole 7a of the fixed scroll 7 to suppress the reverse flow of the discharged gas so that the reverse flow of the turning scroll 6 is reduced. It was to prevent the rotation in advance.

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 S2 is sucked into the compression chamber and discharged. Since the discharge chamber is discharged to the pressure region S1, the compression chamber as well as the suction pressure region S2 of the casing 1 gradually become a vacuum state. When such abnormal operation is continued for a long time, the vacuum of the suction pressure region S2 and the compression chamber is reduced. While accelerating, the Hermetic Terminal (not shown) is damaged by the vacuum compression or the tip chamber is deteriorated by the recompression at the compression mechanism, resulting in a problem that the reliability of the compressor is deteriorated.

The present invention has been made in view of the problems of the conventional low-pressure scroll compressor as described above, and to provide a vacuum compressor preventing device of the scroll compressor that can prevent the high suction pressure area during the operation of the compressor. have.

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

Figure 2 is a longitudinal sectional view showing the main part of a scroll compressor having a vacuum compression prevention device of the present invention.

3a and 3b is a schematic view showing the operation of the vacuum compression preventing device of the scroll compressor of the present invention.

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

6: turning scroll 8: high and low pressure separator

9: check valve assembly 9A: valve housing

9B: Check Valve 10: Fixed Scroll

11: wrap 12: discharge hole

13: bypass hole 20: bypass valve

21: connecting rod fastening hole 30: interlocking member

31: piston rod 32: connecting rod

32a: bend portion 33: hinge lever

33a: lever portion 33b: hinge portion

In order to achieve the object of the present invention, a casing divided into a suction pressure region and a discharge pressure region, a swinging scroll mounted on a frame fixed to the inside of the casing and pivoting by a drive motor, and coupled to the swinging scroll continuously A fixed scroll configured to form a plurality of compression chambers moving in the direction of the plurality of compression chambers, forming discharge holes for communicating the high-pressure side compression chamber to the discharge pressure region, and passing through the bypass holes to communicate the discharge pressure region to the suction pressure region; And a valve housing fixed to the fixed scroll to accommodate the discharge hole, and a check valve that is slidably coupled to the inside of the valve housing to open and close the discharge hole, thereby preventing the compressed gas in the discharge pressure region from flowing back into the compression chamber. Is mounted on the fixed scroll to open and close the bypass hole and opens when the check valve is closed. A bypass valve for guiding a part of the compressed gas in the discharge pressure region to the suction pressure region, and one end coupled to the check valve while the other end is coupled to the bypass valve to open and close the bypass valve according to the movement of the check valve. Provided is a vacuum compression preventing device for a scroll compressor including means.

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

Figure 2 is a longitudinal sectional view showing the main part of the scroll compressor with a vacuum compression preventing device of the present invention, Figures 3a and 3b is a schematic view showing the operation of the vacuum compression preventing device of the scroll compressor of the present invention.

As shown in the drawing, the low pressure scroll compressor including the vacuum compression preventing device of the present invention includes a casing 1 filled with oil to an appropriate height and a main frame 2 fixed to upper and lower sides of the inner circumferential surface of the casing 1, respectively. And a driving motor (not shown) fixedly installed between the subframe (not shown), the main frame 2 and the subframe 3, and the main frame 2 being pressed into the center of the driving motor (not shown). Drive shaft 5 penetrates through, pivot wheel 6 pivotally mounted on upper surface of main frame 2 by being eccentrically coupled to drive shaft 5, and a plurality of continuously engaged with pivot wheel 6 Fixed scroll 10 fixedly installed on the upper surface of the main frame 2 to form two compression chambers, and fixed pressure on the upper surface of the fixed scroll 10 so that the casing 1 discharge pressure region S1 as a high pressure part and a low pressure High and low pressure separating plate (8) partitioned into the female suction pressure area (S2), and the fixed A check valve assembly 9 installed on the rear surface of the hard plate portion of the roll 10 to prevent the compressed gas discharged into the discharge pressure region S1 from flowing back into the compression chamber, and coupled to the check valve assembly 9 to discharge The bypass valve 20 for guiding a part of the compressed gas discharged into the pressure region S1 to the suction pressure region S2, and the interlocking member 30 for interlocking the check valve assembly 9 and the bypass valve 20. ).

The fixed scroll 10 also forms the wrap 11 with an involute curve to engage with the wrap 6a of the turning scroll 6 formed with the involute curve to form a compression chamber, and discharges the final compression chamber. The bypass hole 13 is formed through the discharge hole 12 communicating with the pressure area S1, and the bypass hole 13 communicating the discharge pressure area S1 and the suction pressure area S2 while opening and closing the bypass hole 20 is opened and closed. Form.

The check valve assembly 9 slides on the valve housing 9A for receiving and fixing the discharge hole 12 on the rear surface of the hard plate portion of the fixed scroll 10 and the valve housing 9A to open and close the discharge hole 12. It consists of a check valve 9B to be inserted.

Bypass valve 20 is formed by bending the intermediate portion, one end is hingedly coupled to the hinge lever () to be described later, the other end is formed by connecting rod mounting hole (21) to secure the connecting rod 32 To be combined.

The interlocking member 30 has a piston rod 31 provided on the upper surface of the check valve 9B and a connecting rod hinged to the end of the piston rod 31 and the other end coupled to the bypass valve 20 ( 32 and the bypass rod 20 while the connecting rod 32 is rotated when the check valve 9B is closed by being fixed to the upper surface of the fixed scroll 10 so as to be attached and detached in the middle of the connecting rod 32. It is made of a hinge lever 33 for lifting.

The hinge lever 33 protrudes in the axial direction and is formed by being integrally formed with the lever part 33a detachable from the connecting rod 32 and the lever part 33a. It consists of a branch portion 33b.

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

In the drawings, reference numeral 14 denotes an intake port, and 32a denotes a locking portion.

The vacuum compression preventing device of the scroll compressor of the present invention as described above has the following effects.

That is, when power is applied to the drive motor, the drive shaft 5 rotates to pivot the orbiting scroll 6, thereby between the wrap 6a of the orbiting scroll 6 and the wrap 11 of the stationary scroll 10. The refrigerant gas is sucked into the formed compression chamber, and is compressed and discharged while gradually moving to the center.

At this time, during normal operation of the compressor, as described above, the check valve 9B is raised along the valve housing 9A by the high pressure discharge gas continuously discharged from the compression chamber, so that the discharge hole 12 is kept open. The compressed gas is smoothly discharged from the compression chamber to the discharge pressure region S1. In addition, as shown in FIG. 3A, the bypass valve 20 is pressed by the piston rod 31 and the connecting rod 32 to block the bypass hole 13, so that the compressed gas in the discharge pressure region S1 receives the suction pressure. Backflow to the area S2 is prevented.

On the other hand, during abnormal operation of the compressor (over compression or high vacuum operation), as shown in FIG. 3B, the pressure in the discharge pressure region S1 becomes relatively higher than the pressure in the compression chamber, so that the check valve 9B is provided with a valve housing 9A. By lowering the discharge hole 11 of the fixed scroll 10 to prevent the reverse flow of the discharged compressed gas, the rotating scroll 6 is prevented from rotating backward and integrated with the check valve 9B. The piston rod 31 is also lowered together to draw the bypass valve 20 while the connecting rod 32 rotates about the hinge lever 33, thereby bypassing the valve 20 by the hinge lever 33. The bypass hole 13 is opened by rotating about the hinge portion 33b of the. At the same time, a part of the compressed gas discharged into the discharge pressure region S1 is introduced into the suction pressure region S2 through the open bypass hole 13 to prevent the compression chamber from high vacuum due to lack of refrigerant gas. can do.

Subsequently, when the compressor resumes normal operation, the check valve 9B rises again due to the pressure difference, and the discharge hole 12 is opened and the bypass valve 20 is pushed by the connecting rod 32 to bypass the bypass hole 13. Is to be closed.

The vacuum compressor preventing device of the scroll compressor according to the present invention is provided with a bypass hole for communicating a discharge pressure region and a suction pressure region in a fixed scroll, and bypassing the bypass hole in conjunction with a check valve for opening and closing the discharge hole. By constructing a pass valve, a part of the compressed gas discharged into the discharge pressure region during the abnormal operation of the compressor is brought into the suction pressure region to prevent high vacuuming due to the lack of gas in the compression chamber, thereby allowing the hermetic terminal ( It is possible to prevent the compressor's reliability from being deteriorated due to the damage of the hermetic terminal or the deterioration of the tip seal.

Claims (5)

A casing partitioned into a suction pressure region and a discharge pressure region, A swing scroll mounted on a frame fixed inside the casing and swinging by a drive motor; A plurality of compression chambers continuously coupled to the turning scroll are formed, and a discharge hole for communicating the high pressure side compression chamber with the discharge pressure region is formed in the compression chamber, and the discharge pressure region is bypassed to communicate with the suction pressure region. A fixed scroll formed through the hole, A valve housing fixed to the fixed scroll to accommodate the discharge hole; A check valve which is slidably coupled to the inside of the valve housing to open and close the discharge hole and prevents the compressed gas in the discharge pressure region from flowing back into the compression chamber; A bypass valve mounted on a fixed scroll to open and close the bypass hole, which opens when the check valve is closed and induces a part of the compressed gas in the discharge pressure region to the suction pressure region; One end is coupled to the check valve while the other end is coupled to the bypass valve to prevent the vacuum compressor of the scroll compressor including an interlock means for opening and closing the bypass valve in accordance with the movement of the check valve. The method of claim 1, The interlocking means includes a piston rod provided on the upper surface of the check valve, a connecting rod having one end hinged to the piston rod and the other end coupled to the bypass valve, and a fixed scroll so as to be attached and detached in the middle of the connecting rod. Fixing on the upper surface of the vacuum compressor preventing device of the scroll compressor, characterized in that consisting of a hinge lever that acts as a lever to lift the bypass valve while the connecting rod rotates when the check valve is closed. The method of claim 2, The connecting rod is a vacuum compressor preventing device of a scroll compressor, characterized in that one end of the connecting rod is inserted into the connecting rod mounting hole provided in the bypass valve. The method of claim 3, And the other end of the connecting rod is bent to engage and engage the connecting rod mounting hole of the bypass valve. The method of claim 1, The bypass valve is a vacuum compressor preventing device of the scroll compressor, characterized in that the hinge and hinge coupling.