KR20000050552A - Device preventing over heat in scroll compressor - Google Patents

Abstract

PURPOSE: An apparatus for preventing overheating of a scroll compressor is provided to promptly stop the operation of the compressor by receiving the heat when the abnormal temperature rise generated in the compressor, thereby improving the reliability in time aspect. CONSTITUTION: A scroll compressor including an upper shell(2) and a lower shell forming an external appearance, a compressing machine part for compressing refrigerant, an electric machine part for supplying the compressing machine part with the operating power, a power supply terminal having a plurality of terminals applying an external power supply to the electric machine part, a discharging room for discharging the compressed refrigerant, and a discharging pipe(15) for discharging the compressed refrigerant to the outside, in which an apparatus for preventing overheating of the scroll compressor includes a magnetic element(101) adhered to a vicinity of the discharging room and having Curie point characteristic, a conductor(102) separated from the magnetic element at a predetermined distance and reacts to the magnetism of the magnetic element, a first and a second applying line(104,105) being connected or broken according to the reaction of the conductor, and an elastic member(103) providing the conductor with repulsion against attraction of the magnetic element.

Description

Device preventing over heat in scroll compressor

The present invention relates to a scroll compressor for compressing a refrigerant by a swing action between a fixed scroll and a swing scroll, and more particularly, an overheat prevention device for preventing deterioration of each component by immediately stopping the operation of the compressor when the refrigerant is overheated. It is about.

In general, a scroll compressor is a device that compresses a refrigerant by using a rotational force by an axis by interposing a refrigerant in a compression chamber of an involute curve wrap formed between a fixed scroll and a rotating scroll, and has a larger capacity than other compressors. It is well known that it is mainly used in an air conditioner and a freezer because it has excellent dynamic performance in the range of.

Such a scroll compressor will be described taking the apparatus shown in FIG. 1 as an example.

The overall configuration of the scroll compressor is linked to the upper and lower shells (2) (2a), the rotor (3) and the stator (4), the electric mechanism part, the electric mechanism part divided through the upper diaphragm 1 as shown in FIG. Compressor spout consisting of the revolving scroll 6 and the fixed scroll 7, and the main shaft 5 for transmitting the rotational force generated from the power transmission mechanism to the compressor spout.

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), compressed through the discharge port 10 formed in the center portion of the fixed scroll (7) The coolant is sent to 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.

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 lap of the swing scroll 6 is separated from the outer lap of the fixed scroll 7 at 0 ° to form a suction flow path, refrigerant flows through it, and two scroll wraps are formed according to the swing action of the swing scroll 6. A half moon compression chamber is collected at the center of the scroll, and the refrigerant is compressed.

Eventually, the compression chamber collected at the center is opened at the discharge port 10 on the rear side of the fixed scroll 7 so that the compressed refrigerant is discharged into the discharge chamber 8 composed of the upper diaphragm 1 and the upper shell 2, and discharged. Pipe 15 is sent to the condenser of the refrigeration or air conditioning cycle.

Here, the compressor is not always operated under a constant temperature, and the refrigerant may be overheated by certain specific conditions, such as loss of filling of working fluid, occluded condenser fan of refrigeration system, low pressure condition or occluded suction condition.

When the oil film is broken in a part between the fixed scroll 7 and the turning scroll 6 by this heat, the fixed scroll 7 and the turning scroll 6 are operated while making metal contact, and high heat is generated at this part. The carbonized and badly the fixed scroll 7 and the revolving scroll 6 are pressed together, resulting in an inoperable state of the compressor.

In order to solve this problem, Korean Patent Publication No. 97-8003 installs a thermal valve 16 that is sensitive to temperature on one side of the discharge port 10 of the fixed scroll 7, as shown in FIG. ELP (Over Load Protection) (17) is installed in the overload protection device, and a method of connecting the bypass 18 for bypassing the refrigerant between the thermal valve 16 and the OLP (17) has been proposed.

That is, when the temperature near the center of the compression chamber is higher than the set value, the valve member 16a of the thermal valve 16 is opened by the action of the actuator 16b to bypass the refrigerant of the discharge portion to the suction chamber 9 which is the low pressure part. As a result, the hot discharge refrigerant flows into the OLP 17 via the bypass 18 and the OLP 17 shuts off the power applied to the electric mechanism and stops the compressor.

The actuator 16b of the thermal valve 16 may be any one capable of operating the valve member 16a according to temperature as well as a bimetal diaphragm as shown.

However, since the installation of the thermal valve in the discharge port requires very precise and complicated processing on the fixed scroll back and the discharge port, productivity is reduced, and the thermal valve has a range of operating error due to the ambient environment such as temperature and pressure. There exists a possibility that a problem may arise in initial reference value setting and reproducibility.

In addition, since the thermal valve must reach the overload protection device OLP along the bypass while the thermal valve is in operation, there is a fear that a time delay may occur and reliability is a problem.

Accordingly, the present invention has been proposed in view of this point, and an object of the present invention is to provide an overheat prevention device for a scroll compressor that stops the compressor immediately while determining that the refrigerant is overheated.

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 diagram illustrating an overheat prevention device of a conventional scroll compressor;

Figure 4 is a block diagram of the overheat prevention device of the scroll compressor according to the present invention,

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

Figure 5a is when the power is connected,

5B shows a power short circuit.

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

2: upper shell 15: discharge pipe

101: permanent magnet 102: conductor

103: spring 104: first application line

105: second application line 106: housing

107: insulator

An apparatus for preventing overheating of a scroll compressor according to the present invention for achieving the above objects includes: an upper shell and a lower shell forming an external appearance, a compression mechanism portion for compressing a refrigerant, an electric mechanism portion for providing a driving force to the compression mechanism portion, and an external portion of the power mechanism portion. A scroll compressor comprising a power supply terminal having a plurality of terminals to which power is applied, a discharge chamber through which a refrigerant compressed by the compression mechanism unit is discharged, and a discharge pipe through which a compressed refrigerant inside the discharge chamber is discharged to the outside:

(1) a magnetic body attached near the discharge chamber and having a Curie point characteristic in which the magnet is maintained or extinguished according to the height of the applied temperature;

(2) a conductor spaced apart from the magnetic body by a predetermined distance and reacting to the magnetism of the magnetic body;

(3) a first application line and a second application line connected or shorted according to the reaction of the conductor; And

(4) a resilient member providing the conductor with a repulsive force against the attractive force of the magnetic body.

Optionally, the magnetic material is attached to a predetermined portion of the upper shell or the discharge pipe.

Preferably, any one of the first and second application lines is connected to an external power source, and the other is connected to a terminal of the power terminal.

Optionally, the elastic member is characterized in that made of a non-conductive material.

In this case, the magnetic body located on the discharge side of the refrigerant receives heat from the refrigerant to maintain or lose the magnetism according to the temperature thereof, and the conductors spaced apart from the magnetic body by a predetermined distance from the first application line and the second one according to the presence or absence of the magnetic material. The application line can be connected or shorted.

As a result, when the refrigerant is overheated due to abnormal conditions, the permanent magnet is at a certain temperature or more and loses its magnetism. Therefore, the conductor is separated from each application line, and the power applied to the compressor is cut off. Since it does not need to be installed in a small space, there is an advantage to improve workability and productivity.

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, with reference to the accompanying drawings will be described in detail a preferred embodiment of the overheat prevention device of the scroll compressor according to the present invention.

Figure 4 is a block diagram of the overheat prevention device of the scroll compressor according to the present invention, Figure 5 is an operation diagram of the overheat prevention device of the scroll compressor according to the present invention, Figure 5a is a power supply connection, Figure 5b is a power short circuit.

The overheat prevention device of the scroll compressor according to the present embodiment is a kind of a heat switch, and as shown in FIG. 4, the magnetism disappears when the heat is raised above a predetermined temperature by receiving heat from the refrigerant, and the magnetism is maintained when the temperature is below. The permanent magnet 101 having the shape of the permanent magnet 101 is attached to the discharge chamber 8, such as the outside of the upper shell 2 or the inside of the discharge pipe 15, and reacts to the magnetism within the range of the magnetism of the permanent magnet 101. The conductor 102 is provided, and is interposed between the permanent magnet 101 and the conductor 102 via a spring 103.

In addition, the first application line 104 and the second application line 105 so that the conductor 102 is connected or short-circuited as the conductor 102 moves up / down by the attraction force by the permanent magnet 101 or by the repulsive force by the spring 103. Locate it.

At this time, any one of the first applying line 104 or the second applying line 105 is connected to the external power source, the other is connected to the terminal of the compressor power supply terminal to act as a switching of the compressor.

In addition, the spring 103 is preferably composed of a nonmagnetic material and a non-conductor, and the first application line of the housing 106 is formed to insulate the first application line 104 and the second application line 105. And an insulator 107 in the second application line inlet hole.

The overheat prevention device of the scroll compressor according to the present invention made as described above operates as follows.

First, when the compressor operates normally, as shown in FIG. 5A, since the temperature of the refrigerant heating the permanent magnet 101 is within a set range, the temperature of the permanent magnet 101 is lower than the Curie point (the temperature at which the magnetic body loses magnetic). The magnetism of the permanent magnet 101 is maintained so that the magnetic force acts on the conductor 102 and pulls the conductor 102 downward.

At this time, the attraction force by the permanent magnet 101 is greater than the repulsive force by the spring 103, so that the conductor 102 is pulled downward, the first application line 104 and the first by the conductor 102 Two application lines 105 are connected.

The connection of the first applying line 104 and the second applying line 105 means that power is applied to the power supply terminal of the compressor, whereby the compressor performs a normal compression process of the refrigerant.

Next, when the refrigerant is overheated by a specific condition, the temperature of the permanent magnet 101 rises above the Curie point by the heat of the overheated refrigerant as shown in FIG. 5B, and the magnetism of the permanent magnet 101 disappears. Only the repulsive force by the spring 103 is applied to the 102 so that the conductor 102 is spaced apart from the first and second application lines 104 and 105 as the conductor 102 is pushed upward.

Since the short-circuit of the first and second application lines 104 and 105 is the same as no power is applied, the compressor is stopped immediately, thereby preventing deterioration of each component due to overheating of the refrigerant.

In the above, the principle of thermal switching according to the thermal characteristics of the permanent magnet 101 has been described. However, in order to facilitate the action, the optimum conditions including the magnetism of the permanent magnet 101, the curie point, and the elastic force of the spring 103 are described. You will have to set it.

On the other hand, unlike the conventional technique, that is, the thermal valve is installed very precisely around the discharge port of the fixed scroll, as a comparative example, the present invention stops the operation of the compressor according to the heat of the refrigerant on the outside of the compressor and on the discharge side of the refrigerant. It can be seen that a device that can be installed is installed.

As a result, according to the present invention, the permanent magnet receives heat from the refrigerant and performs normal operation when it is below the Curie point, and when it is abnormal, cuts off the power applied to the compressor, thereby showing an immediate response to the overheating of the refrigerant. It is possible to improve the reliability in terms of downtime of the compressor, the device has a simple structure and can be installed outside the compressor has the advantage of improving workability and productivity.

In addition, although specific embodiments of the present invention have been described and illustrated above, it is obvious that the present invention may be variously modified and implemented by those skilled in the art.

Such modified embodiments should not be individually understood from the technical spirit or the prospect of the present invention, and such modified embodiments should fall within the appended claims of the present invention.

It is clear from the above description that according to the present invention, when an abnormal temperature rise occurs in the compressor, the heat is immediately received and the operation of the compressor is immediately stopped, thereby improving reliability in terms of time.

In addition, the device can be installed outside the compressor, thereby improving the workability and productivity.

Claims (4)

An upper shell and a lower shell forming an appearance, a compression mechanism unit for compressing a refrigerant, a power mechanism unit for providing a driving force to the compressor mechanism unit, a power terminal having a plurality of terminals for applying external power to the power mechanism unit, compressed in the compression mechanism unit In a scroll compressor including a discharge chamber for discharging the refrigerant, the discharge pipe for discharging the compressed refrigerant in the discharge chamber to the outside: (1) a magnetic body attached near the discharge chamber and having a Curie point characteristic in which the magnet is maintained or extinguished according to the height of the applied temperature; (2) a conductor spaced apart from the magnetic body by a predetermined distance and reacting to the magnetism of the magnetic body; (3) a first application line and a second application line connected or shorted according to the reaction of the conductor; And (4) Overheat prevention device of the scroll compressor including an elastic member for providing a repulsive force against the attraction of the magnetic material to the conductor. The method of claim 1, The magnetic body is overheat prevention device of the scroll compressor, characterized in that attached to a predetermined portion of the upper shell or the discharge pipe. The method of claim 1, Any one of the first or second application line is connected to an external power source, the other is connected to the terminal of the power terminal, the overheat prevention device of the scroll compressor. The method of claim 1, The elastic member is a overheat prevention device of the scroll compressor, characterized in that made of a non-conductive material.