KR100511329B1 - Apparatus for protecting gas couvterflow scroll compressor - Google Patents

Abstract

The present invention relates to a gas backflow prevention device of a scroll compressor, the present invention is connected to the rotor of the drive motor and the swinging scroll, and the rotating scroll fixed to the inside of the casing in a state that is fitted to the swinging scroll A scroll compressor including a fixed scroll configured to form a plurality of compression chambers continuously moving together with each other, the scroll compressor comprising: a first check valve fixed to the discharge port so as to block a part of the discharge port communicating with the final compression chamber; By including a second check valve installed in the discharge port in the longitudinal direction to open and close the rest of the discharge port, the weight of the valve is light, so that the discharge port can be opened without excessively increasing the pressure of the compressed gas motor efficiency Can increase. In addition, the weight of the valve is thin and light, the valve itself is bent during opening and closing, or some compressed gas leaks to cushion the impact while reducing the impact noise.

Description

Gas backflow prevention device of scroll compressor {APPARATUS FOR PROTECTING GAS COUVTERFLOW SCROLL COMPRESSOR}

The present invention relates to a gas backflow prevention device of a scroll compressor, and more particularly to a gas backflow prevention device of a scroll compressor that can reduce the impact and noise caused by a valve collision when opening and closing the check valve.

In general, a compressor converts mechanical energy into compressive energy of a compressive fluid, and is generally classified into reciprocating type, scroll type, centrifugal type, and vane type.

Unlike the reciprocating type which uses the linear motion of the piston, the scroll type compressor sucks and discharges the gas by using a rotating body such as a centrifugal type or a vane type.

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

As shown in the drawing, a conventional scroll compressor includes a casing 1 having a gas suction pipe SP and a gas discharge pipe DP, a main frame 2 fixed to upper and lower sides of the inner circumferential surface of the casing 1, and A sub-frame (not shown), a drive motor 3 mounted between the main frame 2 and the sub-frame, and a drive motor press-fitted into the center of the drive motor 3 and penetrate the main frame 2 and the sub-frame. (3) a drive shaft (4) for transmitting the rotational force, a swing scroll (5) coupled to the drive shaft (4) and placed on the upper surface of the main frame (2), a plurality of compression chambers in combination with the swing scroll (5) A fixed scroll 6 fixed to an upper surface of the main frame 2 to form an upper surface, and coupled to a rear surface of the fixed scroll 6 to allow the inside of the casing 1 to be suction pressure area S1 and discharge pressure area S2. Backflow of discharge gas when the compressor stops by being coupled to the high and low pressure separating plate 7 partitioned into the lower plate and the back of the hard plate portion of the fixed scroll 6. It includes a non-return valve assembly (8) for preventing.

The check valve assembly 8 includes a valve housing 8A fixedly installed on the rear surface of the fixed scroll 6 and a piston valve to be inserted into the valve housing 8A so as to slide when the discharge gas flows backward. It consists of a check valve 8B in shape.

In the drawings, reference numerals 5a and 6a denote laps of the turning scroll and laps of the fixed scroll, 6b is an inlet port, 6c is an outlet port, 9 is an old dam ring, which is a rotating prevention mechanism of the turning scroll, and P is a compression chamber.

The conventional scroll compressor as described above operates as follows.

That is, while the drive shaft 4 rotates with the drive motor 3 by the applied power source, the turning scroll 5 turns by an eccentric distance, and the turning scroll 5 wraps with the fixed scroll 6. A plurality of compression chambers (P) are formed between (5a, 6a), the compression chamber (P) is moved to the center by the continuous turning movement of the turning scroll (5) to decrease the volume by suction suction compression of the refrigerant gas Discharge.

When the compressor is in normal operation, the check valve 8B is pushed by the pressure of the compressed gas and ascends along the valve housing 8A to open the discharge port 6b, and the compressed gas is discharged to the discharge pressure region S2 inside the casing 1. Is discharged.

On the other hand, when the compressor is stopped, the pressure in the final compression chamber P is relatively lower than the pressure in the discharge pressure region S2, and the check valve 8B is rapidly lowered due to its own load and the pressure of the discharge gas. The discharge port 6b of 6) was closed to prevent the refrigerant gas in the discharge pressure region S2 from flowing back into the compression chamber P.

However, in the conventional scroll compressor as described above, the check valve 8B suddenly opens or closes, and there is a problem in that it strongly collides with the valve housing 8A or the fixed scroll 6 to cause a large collision noise.

In the case of adopting an inverter motor, the weight of the check valve 8B is excessively large compared to the pressure of the compressed gas when the inverter motor is changed to a low capacity, or when the inverter is operated, the input of the motor is increased in consideration of this. There was also a problem of deterioration.

 The present invention has been made in view of the problems of the conventional scroll compressor as described above, and to provide a gas backflow prevention device of the scroll compressor that can reduce the collision noise of the check valve for blocking the back flow of the discharge gas. have.

Another object of the present invention is to provide a gas backflow preventing device of a scroll compressor which can easily open and close the check valve without increasing the input of the motor.

In order to achieve the object of the present invention, the rotating scroll is connected to the rotor of the drive motor and the rotating scroll, and a plurality of fixed to the inside of the casing in a state of being engaged with the rotating scroll to move continuously with the rotating scroll A scroll compressor including a fixed scroll for forming a compression chamber in pairs, the scroll compressor comprising: a first check valve fixed to the discharge port so as to block a part of the discharge port communicating with the final compression chamber; Provided is a gas backflow preventing device of a scroll compressor including a second check valve installed to slide in the longitudinal direction to the discharge port.

Hereinafter, a valve damping device for 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 part of the scroll compressor of the present invention, Figure 4 is a "I-I" sectional view of Figure 3, a cross-sectional view showing a check valve assembly of the present invention, Figure 5 is a check on the scroll compressor of the present invention Longitudinal sectional drawing which shows the operation state of a valve assembly.

As shown in the drawing, the scroll compressor according to the present invention includes a main frame 2 and a subframe (not shown) fixed to upper and lower sides of the inner circumferential surface of the casing 1, and a drive mounted between the main frame 2 and the subframe. It is coupled to the drive shaft (4) and the drive shaft (4), which press-fits into the center of the motor (3), the drive motor (3) and passes through the main frame (2) and the subframe to transmit the rotational force of the drive motor (3). A rotating scroll 5 mounted on the upper surface of the main frame 2, a fixed scroll 10 fixed to the upper surface of the main frame 2 so as to form a plurality of compression chambers in combination with the rotating scroll 5, The high and low pressure separating plate 7 which is coupled to the rear surface of the scroll 10 and divides the inside of the casing 1 into the suction pressure region S1 and the discharge pressure region S2, and the rear surface of the hard plate portion of the fixed scroll 6. It is coupled to the check valve assembly 20 to prevent the back flow of the discharge gas when the compressor is stopped.

The fixed scroll 10 forms a discharge port 13 communicating with the discharge pressure region S2 of the casing 1 in the final compression chamber P at the center thereof, and on the lower half of one side of the inner circumferential surface of the discharge port 13 will be described later. 1 to form a valve fixing groove (14) for inserting and fixing the fixing projection (21a) of the check valve 21, on the inner peripheral surface opposite the valve fixing groove (14) almost the same height as the valve fixing groove (14) To form a valve guide groove (15) for slidingly inserting the guide projection (22a) of the second check valve 22 to be described later.

The valve guide groove 15 forms the valve stopper 15a by a predetermined thickness so that the guide protrusion 22a of the second check valve 22 does not escape, or by using the high and low pressure separation plate 7. The upper end of the valve guide groove 15 may be blocked.

The check valve assembly 20 is installed so as to partially overlap the first check valve 21 and the first check valve 21 to block a part of the discharge port 13 of the fixed scroll 10. It consists of a second check valve 22 to open and close.

The first check valve 21 is formed in the shape of a semi-circle, but the fixing protrusion 21a is formed at the center of the outer circumferential surface so as to be inserted into the valve fixing groove 14 of the discharge port 13.

The second check valve 22 is also formed in the shape of a semi-circle so as to form a circle with the first check valve 21, the guide protrusion 22a to be inserted into the valve guide groove 15 of the discharge port 13 in the center of the outer peripheral surface ).

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

In the drawings, reference numerals 5a and 11 denote laps of rotating scrolls and laps of fixed scrolls, 12 of suction ports, 9 of old damlings, which are rotating mechanisms of rotating scrolls, and P of compression chambers.

The gas backflow prevention device of the scroll compressor of the present invention as described above has the following effects.

That is, while the drive shaft 4 rotates with the drive motor 3 by the applied power source, the turning scroll 5 turns by an eccentric distance, and the turning scroll 5 wraps with the fixed scroll 10. A plurality of compression chambers P whose volume is narrowed while continuously moving between 5a and 11 are formed, and the refrigerant gas is sucked and compressed and discharged.

Here, in the normal operation of the compressor, the second check valve 22 is separated from the first check valve 21 while being pushed up by the pressure of the compressed gas, thereby discharging the opening 13 of the fixed scroll 10. While being opened, the compressed gas of the compression chamber P is discharged to the discharge pressure region S2 of the casing 1 through the open discharge port 13 between the first check valve 21 and the second check valve 22.

At this time, since the second check valve 22 is formed in a thin plate shape, the weight of the second check valve 22 is light, so that the second check valve 22 can be opened without excessively increasing the pressure of the compressed gas, thereby increasing the efficiency of the motor. In addition, as the weight of the second check valve 22 is light and some compressed gas is discharged in the process of opening the valve, collision noise with the valve stop 15a supporting the second check valve 22 may be reduced.

On the other hand, when the compressor is stopped, the pressure in the compression chamber P is relatively lower than the pressure in the discharge pressure region S2, and the second check valve 22 is pressed down by the compressed gas in the discharge pressure region S2. The discharge port 13 of the fixed scroll 10 is blocked while overlapping with the first check valve 21 to prevent the compressed gas in the discharge pressure region S2 from flowing back into the compression chamber P.

At this time, not only the weight of the second check valve 22 is light but also a small amount of compressed gas flows back into the compression chamber P in the closing process, thereby acting as a buffer when the second check valve 22 is closed, thereby preventing collision between valves. Can be reduced. In addition, as the first check valve 21 is also formed of a thin plate and has elasticity, the first check valve 21 may be slightly curved when colliding with the second check valve 22 to cushion the impact force.

The apparatus for preventing a gas backflow of a scroll compressor according to the present invention includes a first check valve fixed to the discharge port so as to block a part of the discharge port communicating with the final compression chamber, and the discharge port to open and close the rest of the first discharge port. By including the second check valve that slides in the longitudinal direction, the weight of the valve is light and the discharge port can be opened without excessively increasing the pressure of the compressed gas, thereby improving the efficiency of the motor. In addition, the weight of the valve is thin and light, the valve itself is bent during opening and closing, or some compressed gas leaks to cushion the impact while reducing the impact noise.

1 is a longitudinal sectional view showing a part of a conventional scroll compressor;

2 is an exploded perspective view showing a conventional check valve assembly;

3 is a longitudinal sectional view showing a part of the present invention scroll compressor;

4 is a cross-sectional view taken along line "I-I" of FIG. 3, showing a check valve assembly of the present invention;

Figure 5 is a longitudinal sectional view showing an operating state of the check valve assembly in the scroll compressor of the present invention.

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

5: Fixed scroll 5a: Wrap

7: high and low pressure separator 10: fixed scroll

11: wrap 12: inlet

13: outlet 14: valve fixing groove

15: valve guide groove 15a: valve catching jaw

20: check valve assembly 21: the first check valve

21a: fixed protrusion 22: second check valve

22a: guide protrusion

Claims (3)

Fixed scroll which connects to the rotor of the drive motor to make a swing movement and a plurality of compression chambers which are fixed to the inside of the casing while being engaged with the swing scroll and continuously move together with the swing scroll in pairs. In the scroll compressor comprising: A first check valve fixed to the discharge port so as to block a part of the discharge port communicating with the final compression chamber, and a second check valve slidably installed in the discharge port in the longitudinal direction to open and close the rest of the first discharge port. Gas backflow prevention device of scroll compressor. The method of claim 1, The first check valve and the second check valve is formed to overlap the portion so as to increase the sealing force gas backflow prevention apparatus of the scroll compressor. The method of claim 1, The guide roller is formed in the inner peripheral surface of the discharge port of the fixed scroll in the longitudinal direction, and the guide projection is formed in the main surface of the second check valve in contact with the guide groove is inserted into the guide groove to guide the sliding motion Gas backflow prevention device.