KR100310529B1 - Device Protecting of Comperssor - Google Patents

Abstract

Disclosed is a protection device of a compressor for preventing the inside of the compressor from becoming a high vacuum state.

The present invention is to install a valve for preventing the vacuum at any position of the fixed scroll or the upper diaphragm, the valve is based on the piston, the piston is formed according to the pressure in the cylinder and the suction chamber and the discharge chamber communicating with the cylinder It is divided into a space, and is installed in the one space is characterized in that the variable member is changed in volume or length in accordance with the pressure, the other space includes an elastic member corresponding to the variable member, accordingly, It is advantageous to prevent damage to the power supply terminal by preventing high vacuum conditions due to pressure fluctuations and to improve the reliability of the compressor.

Description

Compressor protection device {Device Protecting of Comperssor}

The present invention relates to a compressor, and more particularly, to provide a valve for preventing the inside of the compressor shell from being in a high vacuum state, to prevent damage to the terminal due to discharge of the power terminal terminals, and to improve the reliability of the compressor. In general, the refrigeration air conditioning cycle is divided into four components: a compressor, a condenser, an expansion valve, and an evaporator. Among them, a compressor sucks a low temperature low pressure refrigerant from an evaporator and compresses it to a high temperature high pressure. It serves as an intermediate to the condenser.

As such, a compressor in which the inside of the compressor shell is filled with a low pressure refrigerant is called a low pressure compressor.

There are many kinds of such low pressure compressors, and the scroll compressor will be described as an example.

This scroll compressor is mainly used in air conditioners and freezers because it has excellent dynamic performance in a wide range of capacity compared to other types of compressors.

Its configuration is as shown in Figure 1, the upper and lower shells (2) (2a) divided by the upper diaphragm (1), the rotor mechanism consisting of the rotor (3) and the stator (4), the turning scroll in conjunction with the electric mechanism ( 6) and a main shaft 5 for transmitting the rotational force generated from the power transmission mechanism and the compression mechanism consisting of the fixed scroll 7 to the compression mechanism.

At this time, the upper portion of the diaphragm 1, the upper portion is composed of the discharge chamber (8), the lower portion is composed of the suction chamber (9), the upper diaphragm (1) and the separation that separates the suction chamber (9) and the discharge chamber (8) The refrigerant compressed by the compression mechanism portion is sent to the discharge chamber 8 through the check valve 10 provided between the scrolls 7.

Therefore, the pressure distribution inside the compressor shell 2 (2a) is such that the suction chamber 9 through which the refrigerant flows through the suction pipe 11 becomes the low pressure side, and the upper shell 2 flows through the compression mechanism. The discharge chamber 8 forms a relatively high pressure side.

The refrigerant flowing through the suction pipe 11 is sucked into the compression chamber of the involute curve wrap formed on the fixed scroll 7 and the swing scroll 6, and the rotor 3 of the electric mechanism rotates. Rotating the spindle 5 is connected to the swing frame 6 and the one-way keyway by the old dam ring 14 on the upper frame 12 and the drive bushing 13 to rotate the rotation of the spindle 5 Will be transformed into a turning movement.

The refrigerant compression process according to the turning angle of the turning scroll 6 is shown in FIG. 2. Where A is the direction of rotation and S1 is the center of rotational movement = spindle center = fixed scroll center.

When the swing scroll lap forms a suction flow path away from the outer lap of the fixed scroll at 0 °, the refrigerant flows through the two semi-moon compression chambers formed by the two scroll wraps to the center of the scroll, depending on the swing angle. Proceed.

Eventually, the compression chamber collected at the center is opened at the discharge port 15 penetrated to the upper side of the fixed scroll 7, and the compressed refrigerant discharged through the valve member 16 is mounted on the fixed scroll 7. (17) is pushed up to be discharged into the discharge chamber (8) consisting of the upper diaphragm (1) and the upper shell (2), and the refrigerant compressed through the discharge pipe (18) is sent to a refrigeration / air conditioning cycle or the like.

Since the three-phase induction motor is generally used as the electric mechanism part 3 (4) of such a scroll compressor, a power supply terminal 19 having three terminals is provided on the side wall of the lower shell 2a to provide the electric machine part 3 External power is applied to (4).

On the other hand, the fixed scroll (7) having an involute-shaped wrap and the rotating scroll (6) having an involute-shaped wrap having a phase difference of 180 ° with the involute curve are engaged to face each other to form a compression chamber formed in pairs When the turning scroll 6 rotates with respect to the fixed scroll 7 while the rotating scroll is prevented from rotating, the compression chamber moves toward the center to reduce the volume to perform the compression action, and this process is continuous and symmetrical. Since the load fluctuation range is significantly smaller than that of the reciprocating or rotary compressor, it is greatly advantageous in terms of vibration, noise, reliability, and efficiency.

In such a compression process, the refrigerant gas introduced into the compressor through the suction pipe 11 is introduced into the scroll through a suction port (not shown) formed on one side of the fixed scroll 7.

At this time, the suction gas is introduced into the suction chamber (9) formed on the suction port (not shown) side of the fixed scroll (7) to start the compression, a part of the opposite side 180 ° along the guide passage of the fixed scroll (7) It is introduced into the suction chamber 9 to be formed and begins to be compressed at the same time.

As described above, the refrigerant gas in the suction chamber 9 which begins to be symmetrically simultaneously compressed is moved while moving toward the center of the scroll as the swinging scroll 6 moves, and then discharge port 15 formed in the hard plate of the center of the fixed scroll 7. It is discharged through).

Meanwhile, in the refrigerant or air conditioning cycle to which the scroll compressor is applied, a process in which a low-temperature low-pressure gaseous refrigerant flows into the outdoor compressor 21 from the evaporator 20 in the room and heat-exchanges with cold air of high temperature and high pressure as shown in FIG. 3. Condensed into a liquid refrigerant, and becomes a two-phase refrigerant in the gas phase and a liquid phase through an expansion valve (23), and the two-phase refrigerant flows back into the evaporator 20 in the room to exchange heat with hot air in the room. In addition to the vaporization of the gas phase refrigerant heat exchanged cold air is to perform the cooling or cooling.

When installing or transferring such a refrigerator or an air conditioner, each element must be dismantled and dismantled to recover the refrigerant remaining in each element, and such pump down operation is performed by an operator. The operator closes the valve 24 at the rear end of the condenser 22 or the valve 24 'at the front of the compressor 21 before dismantling each element, and then drives the compressor 21 to collect the refrigerant in the condenser. When properly recovered, the valve of the condenser 22 is closed so that the refrigerant is trapped in the condenser 22.

After that, each element is separated and the work is performed. However, the conventional low pressure scroll compressor is mounted in a refrigeration air conditioner, and during pump-down operation, the pressure of suction gas continues to drop so that high vacuum inside the compressor There is a problem that the terminal is damaged due to the discharge between the power supply terminal terminals. Further, if the pressure inside the compressor falls below the set value, there is a disadvantage in reducing the reliability of the compressor.

Accordingly, an object of the present invention is to solve the problems caused during the pumpdown operation as described above, and to prevent damage to a power terminal by preventing a high vacuum state inside the compressor shell.

Another object of the present invention is to improve the reliability of the compressor by preventing the pressure inside the compressor from falling below a set value.

1 is a longitudinal sectional view of a general scroll compressor,

2 is a refrigerant compression progress diagram of a typical scroll compressor,

3 is a general refrigeration and air conditioning cycle configuration diagram,

4 is a longitudinal sectional view of a scroll compressor according to the present invention;

5 is an operation of the protection device of the scroll compressor according to the present invention,

5A is in normal operation,

5B is a high vacuum operation,

6 shows another embodiment of a scroll compressor according to the present invention,

6A is a schematic view in which a suction passage is formed on the side of a valve,

6B is a schematic view of a suction passage formed below the valve.

*** Explanation of symbols for main parts of drawing ***

2: upper shell 2a: lower shell

6: turning scroll 7: fixed scroll

8: discharge chamber 9: suction chamber

25 valve 26 cylinder

27: piston 27a: flow path

28: variable member 29: elastic member

30: discharge passage 31: suction passage 32: stopper

A scroll compressor according to the present invention for achieving the above object, the shell is divided into the suction chamber and the discharge chamber by the upper diaphragm; A compression mechanism unit mounted below the upper diaphragm and configured to engage the fixed scroll and the swing scroll to form a compression chamber; A scroll compressor mounted directly below the compression mechanism unit and including an electric mechanism unit for operating the compression mechanism unit, the fixed scroll comprising: a cylinder formed recessed inward in an upper side of the suction chamber; A discharge passage having one end penetrating toward the inside of the cylinder and the other end penetrating toward the discharge chamber; A piston installed in the cylinder, the piston having one end penetrating toward the suction chamber and the other end penetrating toward the discharge passage; And a valve including an elastic member and a variable member interposed on one side and the other side of the piston; And a stopper attached to one end of the cylinder to prevent detachment of the elastic member. Preferably, the other side of the cylinder penetrates the fixed scroll to the space of the low pressure side. It is preferable that a suction passage is formed therethrough. In this case, the suction gas pressure inside the compressor rapidly drops during the pump-down operation of the compressor, and a high vacuum state is provided, and a valve for preventing the vacuum state is provided.

As a result, since high vacuum inside the compressor is prevented, there is an advantage of preventing damage to the power supply terminal and improving the reliability of the compressor.

And, there may be a plurality of embodiments of the present invention, hereinafter will be described in detail with respect to the most preferred embodiment.

This preferred embodiment allows for a better understanding of the objects, features and advantages of the present invention.

Hereinafter, exemplary embodiments of the present invention will be described in detail with reference to the accompanying drawings.

In addition, the techniques of the present invention can be applied to various low pressure compressor products as well as scroll compressors.

Therefore, the drawings used in the description are not related to a specific scroll compressor product, but focus on various low pressure compressors.

In addition, in drawing used for description, about the component same as FIG. 1 thru | or FIG. 3, the same code | symbol may be attached | subjected, and the overlapping description may be abbreviate | omitted.

In addition, in the following, an example applied to a scroll compressor is considered to help understand the description.

An embodiment of the present invention will be described with reference to the drawings.

Figure 4 is a longitudinal sectional view of the scroll compressor according to the present invention, Figure 5 is an operation of the protection device of the scroll compressor according to the present invention, Figure 5a is a normal operation, Figure 5b is a high vacuum operation, Figure 6 As another embodiment of the scroll compressor according to the present invention, Figure 6a is a schematic diagram of the suction passage formed on the side of the valve, Figure 6b is a schematic diagram of the suction passage formed on the lower side of the valve.

First, as shown in Fig. 4, the compression mechanism portion for compressing the gas sucked into the shell (2) (2a) of the compressor consists of a turning scroll (6) and a fixed scroll (7), the scroll is engaged to form a compression chamber. And an upper diaphragm which separates the suction chamber 9 and the discharge chamber 8.

Therefore, the pressure distribution inside the compressor shell 2 (2a) is such that the suction chamber 9 through which the refrigerant flows through the suction pipe 11 becomes the low pressure side, and the upper shell 2 flows through the compression mechanism. The discharge chamber 8 forms a relatively high pressure side.

In the pump-down operation in which the valve of the condenser outlet is closed in this state, when the operation state of the compressor is normal as shown in FIG. 5A, since the pressure inside the compressor is large, the flow passage 27a of the piston moving in accordance with the pressure in the cylinder 26 is The discharge passage 30 communicates with the discharge chamber 8 and is displaced.

At this time, when high vacuum occurs inside the compressor as the pressure of the suction gas continues to drop as shown in FIG. 5B, a fluctuation member 28 having a volume or a length varying with pressure is installed in one space divided based on the piston 27. Since the pressure gas of the desired set value is filled in the space in which the variable member 28 is installed, when the pressure gas falls below the set value, the volume length of the variable member increases, pushing the piston 27 and at the same time, the flow path of the piston 27a. Is equal to the discharge passage 30 in communication with the discharge chamber 8. The elastic member 29 is prevented from being separated by the stopper 32 attached to one end of the cylinder (26).

That is, since the suction chamber 9 is in a high vacuum state, the discharge gas of the discharge chamber 8 flows into the suction chamber through the discharge passage 30.

Here, when the vacuum state of the suction chamber 9 is maintained at a pressure equal to or greater than the set value, the elastic member 29 installed in the other space of the cylinder 26 returns the piston 26 to its original position by the restoring force, and at the same time, The fluctuation member 28 reduces the volume and shifts the coin passage 27a of the piston to be displaced again with the discharge passage 30, thereby preventing the discharge gas from flowing into the suction chamber.

Thus, the valve 25 for releasing the vacuum is provided at any position of the fixed scroll 7 or the upper diaphragm 1 in the compressor shell so that the compressor can operate normally.

In addition, as shown in FIG. 6, since the discharge gas leaks into the space gap of the cylinder 26 and the piston 27 is moved by the gas pressure during normal operation, the same pressure is always applied to the space of the cylinder 26 to prevent this. The suction passage 31 is formed in communication with the suction chamber to the space in which the variable member 28 is installed.

The suction passage 31 may be installed at the side of the cylinder 26 as shown in FIG. 6A, and may be installed at the lower side as shown in FIG. 6B.

On the other hand, as a comparative example, the conventional technology, that is, in the pump-down operation in which the compressor is mounted in the refrigeration air conditioner to lock and operate the valve at the condenser outlet, the pressure of the intake gas continues to drop so that a high vacuum condition occurs inside the compressor, and thus, Unlike the configuration that damages the terminal due to the discharge, the present invention provides a valve for preventing vacuum at any position of the fixed scroll and the upper diaphragm of the compressor.

As a result, it can be seen that the present invention prevents damage to the power supply terminal and improves the reliability of the compressor.

It is clear from the above description that the present invention has the effect of preventing the occurrence of vacuum inside the compressor to prevent discharge occurring between the power supply terminal terminals, thereby preventing damage to the terminal, and improving the reliability of the compressor.

Claims (2)

A shell divided into a suction chamber and a discharge chamber by an upper diaphragm; A compression mechanism unit mounted below the upper diaphragm and configured to engage the fixed scroll and the swing scroll to form a compression chamber; A scroll compressor mounted directly below the compression mechanism unit and including an electric mechanism unit for operating the compression mechanism unit; The fixed scroll is a cylinder formed by recessing inward on the upper side to form a suction chamber: A discharge passage having one end penetrating toward the inside of the cylinder and the other end penetrating toward the discharge chamber; A piston installed in the cylinder, the piston having one end penetrating toward the suction chamber and the other end penetrating toward the discharge passage; A valve including an elastic member and a variable member interposed on one side and the other side of the cylinder with respect to the piston; And And a stopper attached to one end of the cylinder to prevent separation of the elastic member. The method of claim 1, And a suction passage formed on the other side of the cylinder by passing through the fixed scroll and a space on the low pressure side.