KR20000020265U - Compressor overload protection - Google Patents

Abstract

The present invention relates to an overload protection device of a compressor. This is provided with a valve body between the motor driving part and the compression part, which is inside the compressor showing the largest pressure and temperature distribution of the working fluid, to control the operation of the compressor according to the overload generated in the compressor, thereby assisting the overload protector installed in the compressor. The inlet 12 of the small diameter formed on the compression part CC side on the compression fluid flow path between the suction pipe 1 and the outflow pipe 40 into which the working fluid flows; A large diameter outlet 14 for flowing the compressed fluid introduced from the inlet 12 toward the outlet pipe 40; And it is provided between the inlet 12 and the outlet 14 is provided with an overload protection of the compressor provided with a valve body 30 for controlling the flow of the compressed fluid in response to the temperature of the compressed fluid. Thus, by preventing the internal overload of the compressor generated inside the cylinder to extend the life of the main part of the compressor has the effect of extending the life of the entire compressor.

Description

Compressor overload protection

The present invention relates to an overload protection device of a compressor, and particularly has a valve body that can adapt to the temperature of the compressed fluid inside the compressor that compresses the fluid by vanes, so that the compressor can be intermittently operated when the compressed fluid is overheated. Therefore, the present invention relates to an overload preventing device of a compressor, which can prevent the overload of the compressor and extend the life of the compressor.

In general, air conditioners are equipped with a compressor for continuously supplying energy for operation and used to convert energy of a working fluid.

The above air conditioners include refrigerators, air conditioners, and the like, and rotary compressors are generally adopted among many compressor types.

The rotary compressor is mounted as an element for compressing a working fluid, that is, a refrigerant in a cooling cycle of an air conditioner, and the compressor phase changes the refrigerant to a high temperature and a high pressure.

As shown in FIG. 1, the rotary compressor is divided into a housing 100, a motor driving unit 110, and a compression unit 120 provided in the housing 100.

The motor driving unit 110 is for generating a rotational motion in the compressor, the compression unit 120 compresses the refrigerant by the rotational movement of the motor driving unit (110).

The refrigerant is introduced into the compressor from the accumulator 140 through the suction pipe 125 communicating with the compression unit 120 and is discharged from the motor driving unit 110 through the outlet pipe 105 to the outside of the compressor.

The motor driving unit 110 includes a motor 112 provided in the housing 100 in which the outflow pipe 105 is disposed on an upper side thereof, and a shaft 114 connected to the center of the motor 112.

The compression unit 120 includes a roller 122 installed eccentrically at a lower end of the shaft 114, a cylinder 124 and a roller 122 surrounding the roller 122 and communicating with a suction pipe 125 through which refrigerant is introduced. Upper and lower flanges 126 and 128 for sealing and fixing the cylinder 124 and flange holes 130 formed at predetermined positions of the upper flange 126 to flow compressed gas to the motor driving unit 110. It is composed.

In the roller 122, an eccentric portion 123 attached to the shaft 114 is installed to move freely in the roller 122. When the shaft 114 is rotated by the motor 112, the roller 122 is rotated. ) Compresses the refrigerant introduced through the suction pipe 125 while rotating eccentrically.

The compressed refrigerant is ejected from the cylinder 124 to the flange hole 130 through an unshown flow path and then to the outside of the compressor through the outflow pipe 105 provided at the upper end of the housing 100 via the motor driving unit 110. Discharged.

As it is discharged to the outflow pipe 105 as described above, it is compressed to a high temperature and a high pressure appropriate to the capacity of the compressor from the eccentric rotation of the roller 122. At this time, the roller 122 is driven by the motor driving unit 110, by detecting the pressure and temperature of the entire compressor by this driving force to prevent the overload of the compressor.

In order to prevent the overload of the compressor, an overload protector (not shown) is installed at one side of the compressor.

However, since the overload protector detects the refrigerant state immediately before being discharged to the outflow pipe 105, that is, the final pressure and temperature inside the compressor, the overload generated in the compression unit 120 and the motor driving unit 110 is directly It will not affect.

Since the pressure and the temperature generated by the compression unit 120 and the motor driving unit 110 are higher temperature and pressure than the temperature and pressure detected by the overload protector, the compressor may be damaged from the overload generated in the portion.

The present invention was devised in view of the above problems, and provided with a valve body between the motor driving part and the compression part, which is inside the compressor showing the largest pressure and temperature distribution of the working fluid, according to the overload generated in the compressor. It is an object of the present invention to provide an overload preventing device for a compressor that can assist the overload protector installed in the compressor by intermittent driving.

The present invention for achieving the above object, the inlet of the small diameter formed on the compression part side on the compression fluid flow path between the suction pipe in which the working fluid of the compressor is introduced and the outlet pipe from which the compressed fluid is discharged; A large diameter outlet for flowing the compressed fluid introduced from the inlet toward the outlet pipe; A valve body installed between the inlet and the outlet and formed of a disc of a bimetal bonded with different kinds of metals having different thermal expansion coefficients to interrupt a flow of the compressed fluid; A packing ball for blocking the inlet port at a central portion of the valve body; And a packing ball formed around the packing ball to provide an overload prevention aid of the compressor in which a plurality of valve balls are formed to flow the compressed fluid to the outlet when the packing ball is opened.

1 is a cross-sectional view of a conventional compressor,

2 is a cross-sectional view and a partially enlarged cross-sectional view of the compressor is installed with an overload protection device of the compressor according to an embodiment of the present invention;

3 is a perspective view of the valve body shown in FIG.

4 is an operating state diagram of the valve body shown in FIG.

<Explanation of symbols for main parts of drawing>

1: Suction pipe 2,3: Flange

4 roller 5 eccentric part

6: cylinder 8: shaft

10: flange ball 12: inlet

14 outlet 30 valve body

32: valve ball 34: packing ball

40: outflow pipe

Hereinafter, the present invention will be described in detail based on the accompanying drawings.

2 is a cross-sectional view and an enlarged cross-sectional view of a compressor in which an overload prevention auxiliary device of the compressor is installed according to an embodiment of the present invention, and a disk-shaped valve body 30 on a working fluid, that is, a coolant flow path inside the compressor C. ) Is installed.

In the compression part CC of the compressor C, the cylinder 6 in which the roller 4 was built is installed in the lower end of the shaft 8 built in the motor 7 of the motor drive part CM, and the cylinder 6 In order to form a cylinder chamber in the upper and lower parts, the flanges 2 and 3 are installed on the upper and lower sides of the cylinder 6, and the upper flange 2 has a fine flow groove (shown) for the compressed refrigerant to flow to the motor driving part CM. Not formed), the flow groove is in communication with the flange hole (10). That is, the refrigerant introduced into the compressor (C) through the suction pipe (1) is compressed in the cylinder (6), and discharged to the outflow pipe (40) via the flange hole (10) and the motor driving unit (CM) communicated with each other. do.

A lower diameter inlet 12 is formed in the lower portion of the flange hole 10 toward the suction pipe 1 through which the refrigerant is introduced.

In addition, a large diameter outlet 14 is formed at an upper portion of the inlet 12 to discharge the compressed refrigerant introduced into the motor driving unit CM.

The inlet 12 and the outlet 14 are spaced apart from each other while maintaining the diameter of the flange hole 10. The disc valve body 30 is installed between the inlet 12 and the outlet 14.

As shown in FIG. 3, the disc valve body 30 is a bimetal in which heterogeneous metals having different expansion coefficients are bonded according to a constant temperature. The disc valve body 30 has a temperature and a motor driving part according to the maximum pressure of the compressor C. Adopt a metal body that can adapt to the maximum temperature caused by the friction generated in).

Since the disc valve 30 is bent upward and downward depending on the temperature of the fluid passing through the flange hole 10 in accordance with the function of the bimetal, it adapts to the temperature of the compressed fluid to interrupt the flow of the compressed fluid.

A hemispherical packing ball 34 protrudes from the central portion of the disc valve body 30 to selectively block the inlet 12.

In the periphery of the packing ball 34 is operated according to the temperature of the disc valve body 30, when the packing ball 34 opens the inlet 12, a plurality of compressed fluids for flowing to the outlet 14 The valve hole 32 is formed.

Next will be described the operation of the present invention made as described above.

First, the refrigerant flows into the compressor C from the accumulator A through the suction pipe 1, and the introduced refrigerant flows into the cylinder 6 through the suction pipe 1.

As the motor driving part CM of the compressor C is operated, the shaft 8 is rotated, and the eccentric part 5 arranged at the lower end of the shaft 8 eccentrically rotates the roller 4. Eccentric rotation of the roller 4 is to compress the refrigerant introduced into the cylinder (6).

The refrigerant introduced into the cylinder 6 is phase-changed to high temperature and high pressure, and the compressed refrigerant rises in temperature. The refrigerant at this time has the highest temperature among the temperatures of the refrigerant appearing in the entire compressor (C).

That is, the pressure and temperature of the refrigerant in the cylinder 6 flows to the motor driving part CM while being discharged from the cylinder 6, and at this time, the temperature rises from the temperature generated by the motor driving part CM to a high temperature. It is slightly higher than the temperature detected by the existing overload protector.

The reason for this is that the temperature of the refrigerant raised between the motor driving unit CM and the compression unit CC flows to the upper portion of the compressor C, so that the temperature of the refrigerant increases and conducts convection to the housing and other components of the compressor C. Because it falls somewhat.

The refrigerant compressed in the cylinder 6 is discharged to the flange hole 10 of the upper flange (2). At this time, the refrigerant passing through the flange hole 10 exhibits a maximum temperature for the reasons described above. From this, the inside of the compressor C may be overloaded.

In this case, the refrigerant flows into the small diameter inlet 12, and when the compressor C is operated at the compressor maximum capacity or less, the disc valve body 30 installed at the upper end of the inlet 12 is curved upward.

When the disc valve body 30 is bent upward, as shown in FIG. 4A, the refrigerant at the inlet 12 flows toward the outlet 14 through the valve hole 32 of the disc valve body 30. Thus, the refrigerant is discharged to the outflow pipe 40 via the motor driving part CM.

When the compressor C is operated as described above, the overload occurring in the entire compressor C is controlled by the existing overload protector to interrupt the operation of the compressor C.

When the overload protector is sensitive, the refrigerant compressed in the cylinder 6 detects the high temperature generated while passing through the compressor C and the overheating of the motor driving unit CM to interrupt the operation of the compressor C. .

When the disc valve element 30 intercepts the compressor C, only the overload generated by the refrigerant introduced from the suction pipe 1 is compressed in the cylinder 6 of the compressor C.

The overload generated in the cylinder 6 raises the refrigerant to a high temperature, and when the refrigerant passes through the disc valve body 30 at a high temperature, the disc valve body 30 is bent downward in response to the high temperature. When the disc valve body 30 is bent downward, the packing ball 34 formed in the lower center of the disc valve body 30 blocks the inlet 12.

When the inlet 12 is blocked, the refrigerant introduced through the suction pipe 1 is not discharged and receives some compression from the cylinder 6, but the compression of the cylinder 6 is caused by the inherent volume of the refrigerant. Will stop. That is, the refrigerant remaining in the cylinder 6 stops the operation of the compressor C, and when the compressor C stops the operation, the refrigerant flowing into the suction pipe 1 also stops the flow.

As described above, the disc valve body 30 which cuts off the inlet 12 in response to an overload of the compression unit CC itself of the compressor C has a result of intermittent operation of the compressor C.

When the compressor C stops operating for a predetermined time, the refrigerant remaining in the cylinder 6 decreases in temperature, and when the temperature decreases, the disc valve 30 is bent upward by being sensitive to the temperature of the refrigerant again. .

In this case, while the refrigerant flows rapidly, the compressor C is operated again. When the compressor C is operated again, the refrigerant is supplied from the accumulator A through the suction pipe 1 again.

While repeating the above process, the disc valve body 30 intermittently operates the compressor C according to the refrigerant temperature inside the cylinder 6, thereby preventing overheating in the compressor C, thereby preventing the compressor C. You can protect it.

As described above, the present invention interrupts the operation of the compressor C in response to the refrigerant that is overheated in the cylinder 6, and thus, the main part of the actual compressor C, together with the prevention of overload occurring in the entire compressor C, The overload of the cylinder 6 part can be prevented.

The overload prevention auxiliary device of the present invention includes a bimetal metal disc valve element which is sensitive to the refrigerant temperature on the discharge side of the cylinder, thereby preventing the internal overload of the compressor generated inside the cylinder, thereby extending the life of the main part of the compressor. As a result, it is effective to extend the life of the whole compressor.

Claims (3)

In the compressor (C) in which the suction pipe (1) into which the refrigerant is introduced and the outflow pipe (40) from which the compressed refrigerant is discharged are disposed, An inlet 12 formed on the compression part CC side on the refrigerant passage between the suction pipe 1 and the outflow pipe 40; An outlet 14 for flowing the refrigerant introduced from the inlet 12 toward the outlet pipe 40 and having a diameter larger than that of the inlet 12; And The overload prevention auxiliary device of the compressor, characterized in that provided between the inlet (12) and the outlet (14) is provided with a valve body 30 to regulate the flow of the refrigerant in response to the temperature of the refrigerant. The central portion of the valve body 30, A packing ball 34 for blocking the inlet 12; And The packing ball 34 is formed around the packing ball 34, characterized in that the packing ball 34 has a plurality of valve holes 32 for flowing the refrigerant to the outlet 14 when opening the inlet 12 Overload Protection Aid 2. The apparatus for preventing overload of a compressor according to claim 1, wherein the valve body (30) is formed of a bimetal bonded with different kinds of metals having different thermal expansion coefficients.