KR20010054115A - Valve for protecting compressor - Google Patents

Abstract

PURPOSE: A compressor preventive valve is provided to turn on/off a compressor and to discharge a refrigerant according to abnormally high and low pressures. CONSTITUTION: By applying pressure, a guide(45), a stopper(46), and a pivot base(41) receive pressure by a film member(47) of a pressure switch unit(40). Thus, a low pressure switch(43) is pushed. A guide pin(42) is lowered for pressing a pressurizing spring(48) to turn on a contact point. In case of the pressure over a first established pressure, the guide is lowered to push a high pressure disk(44). The disk is inverted for elevating the guide pin by the repulsive force of the pressurizing spring. Therefore, the contact point is turned off. In case of the pressure under the first established value, the pressure transferred to the guide becomes weaker than the repulsive force of the high pressure disk to return the disk. Thus, the guide pin is lowered for turning on the contact point. In case of the pressure under a second established pressure, the pressure applied to the film member becomes weaker than the repulsive force of the low pressure disk. The pivot base, stopper, and guide are lifted for elevating the guide pin. Thus, the contact point is turned off. If abnormality happens in a compressor(70), an abnormally high pressure is generated for turning off the compressor. Moreover, a pressure preventive unit(60) is operated for elevating a seat cover(30) through a discharging hole(22) of a base(20) so that refrigerant is discharged.

Description

VALVE FOR PROTECTING COMPRESSOR

The present invention relates to a compressor protection valve, and more particularly, to a compressor protection valve for protecting a compressor when an abnormality occurs in the compressor.

In general, the compressor increases the pressure of the refrigerant gas, that is, compresses the refrigerant gas, and the refrigerant circulates in the cycle by the action of the compressor. Specifically, the low pressure refrigerant gas at the end of the evaporator in the evaporator serves to compress the high pressure to the condenser. By this action, the refrigerant circulates in the cycle and the compressor sends the work inside the vehicle absorbed by the evaporator to release heat to the air passing through the condenser.

One side of such a compressor is provided with a pressure relief valve as shown in FIG.

As shown, the pressure relief valve (10) is a seat rubber inside the body (11) when the internal pressure of the compressor is ideally raised, e.g., 35-42 kg / cm < 2 > The seat cover 13 provided with 12 is raised to pressurize the spring 14 and the refrigerant is ejected to the outside of the compressor through the opening of the disc cap 15 to protect other important parts of the compressor.

And a dual pressure switch (not shown) installed on one side of a receiver-drier that stores refrigerant from the condenser in an air conditioning system such as a cooling cycle and always sends liquid refrigerant to the expansion valve. ) Detects the discharge of the compressor and the high or low pressure of the condenser and turns off the compressor. Therefore, it serves as a means of preventing the danger of the high pressure portion past the compressor.

As described above, since the pressure relief valve 10 and the dual pressure switch are separately installed, the manufacturing cost is increased, and the labor of labor is increased. In addition, the compressor is turned off by sensing the high pressure in the condenser, but the inside of the reactor is already at a high pressure, and if the dual pressure switch malfunctions, the condenser may be ruptured before the pressure relief valve 10 is operated. In addition, the responsiveness tends to rupture the condenser or cause the hose and pipe to rupture.

The present invention has been made to solve the above problems, and provides a compressor protection valve capable of turning on / off a compressor at an abnormal high pressure and an abnormal low pressure and releasing a refrigerant. There is a purpose.

1 is a schematic cross-sectional view showing the configuration of a general pressure relief valve.

Figure 2 is a schematic cross-sectional view showing the configuration of a compressor protection valve according to the present invention.

3 is a cross-sectional view showing an operating state of FIG.

<Description of the symbols for the main parts of the drawings>

20. Base

30. Seat Cover

40. Pressure switch

60. Pressure protection

70. Compressor

Compressor protection valve of the present invention for achieving the above object, the inlet for the refrigerant is introduced, and the outlet is formed discharge outlet is formed, the base is installed in the compressor; A seat cover provided between the inlet and the outlet to be elevated; A pressure switch unit disposed at the seat cover and a lower portion thereof to turn on / off an operation of the compressor according to the pressure of the refrigerant; And a pressure preventing part installed on the outlet side of the upper seat cover to discharge the refrigerant through the outlet when the seat cover is raised when the pressure of the compressor is abnormally increased.

In the present invention, the pressure switch unit, the pivot base is provided on one side of the inlet and the through hole formed in the center thereof; A guide pin supported in the through hole and made of a predetermined insulating material; A low pressure disk and a high pressure disk installed on the upper and lower portions of the pivot base so as to be elastically biased to turn on / off the compressor; A guide installed in the lower portion of the high pressure disk to reduce the pressure received from the upper portion and to deliver the high pressure disk; A stopper installed at an edge of the guide to transmit the force transmitted from the upper portion to the pivot base; A film member installed below the guide and the stopper to maintain airtightness; A pressure spring supported by the guide pin and receiving a force generated by the action of the high and low pressure disks from the guide pin; A contact terminal grounded to the pressure spring; And a terminal member connected to the contact terminal and an external power source.

In the present invention, the pressure preventing portion, the elastic member which is installed on the upper portion of the seat cover is compressed and stretched when the seat cover is elevated; And a disk cap installed at an end of the discharge port and having a refrigerant discharge port communicating with the discharge port.

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

The compressor protection valve according to the present invention is such that the function of the conventional pressure relief valve installed in the compressor and the conventional dual pressure switch installed in the receiver drier will be described in detail.

2 shows a partially exploded perspective view of a compressor protection valve according to the invention.

Referring to the drawings, the compressor protection valve according to the present invention, the inlet port 21 through which the refrigerant is introduced and the outlet 22 through which the refrigerant is discharged is formed, for example, the discharge unit (for example of the compressor 70 of the compressor 70) a base cover 20 installed in a discharge), a seat cover 30 provided to be movable up and down between the inlet 21 and the outlet 22 of the base 20, and the base of the seat cover 30 and its lower portion. A pressure switch 40 installed at the inlet 21 of the 20 to block the operation of the compressor 70 at low and abnormal high pressures when the pressure of the refrigerant is not normal, and the upper portion of the seat cover 30. Is installed on the outlet 22 side of the base 20 is configured to include a pressure preventing unit 60 to discharge the refrigerant through the outlet 22 of the base 20 when the abnormal pressure rise of the compressor (70).

The pressure switch unit 40 is installed on one side of the inlet 21 of the base 20, the pivot base 41 formed with a through hole 41a in the center thereof, and the through hole of the pivot base 41. A guide pin 42 made of an insulating material, such as a plastic material, and supported by 41a, and elastically biased on upper and lower portions of the pivot base 41, respectively, to turn the compressor 70 on or off. Low pressure disk 43 and the high pressure disk 44 to be turned off, and the guide 45 is installed in the lower portion of the high pressure disk 44 to reduce the pressure received from the upper portion to the high pressure disk 44 And a stopper 46 installed at an edge of the guide 45 to transmit a force transmitted from the upper portion to the pivot base 41, and a lower portion of the guide 45 and the stopper 46. It is supported by the film member 47 and the guide pin 42 provided to maintain the airtight A pressure spring 48 that receives the force generated by the action of the disk 44 and the low pressure disk 43 from the guide pin 42, and a first contact terminal provided at one end and the other end of the pressure spring 48 ( 49, a second contact terminal 51 provided on the seat cover 30 to be grounded with the first contact terminal 49, and a terminal member 52 connected to the second contact terminal 51 and an external power source. It is configured to include).

An O-ring 53 is installed at one lower side of the film member 47, and the low pressure and high pressure disks 43 and 44 are formed of conical leaf springs, and a threaded portion is formed on an outer circumferential surface of the inlet 21 of the base 20. 23 is formed to be coupled to the compressor 70 by screwing.

The pressure preventing part 60 is installed at an upper portion of the seat cover 30 and is elastically compressed and tensioned when the seat cover 30 moves up and down at an end of the outlet 22 of the base 20. And a disc cap 62 provided with a refrigerant discharge port 62a in communication with the discharge port 22.

Reference numeral W not described in FIG. 2 denotes an input / output wire terminal, and 31 denotes a sheet rubber. The first and second contact terminals 49 and 51 are not limited to those described above, and may be implemented if the first and second contact terminals 49 and 51 are connected to the input / output wire terminal W and energized.

Referring to the operation of the compressor protection valve according to the present invention having the configuration as described above are as follows.

The pivot base 41 of the pressure switch part 40 causes the high pressure and low pressure disks 43 to be inverted, and the guide pin 42 transmits the action of the high pressure and low pressure disks 43 to the pressure spring 48. Be sure to The film member 47 transmits the airtightness and pressure of the air conditioning system to the guide 45 and the stopper 46, and the O-ring 53 installed at the lower portion of the film member 47 has an air conditioning system, for example. It keeps the airtight when fastened to the compressor (70). In addition, according to whether the first and second contact terminals 49 and 51 are in contact with each other, the power is turned on and off, and the terminal member 52 is connected to an external input / output wire terminal W to allow energization. .

In more detail, when pressure is applied, the low pressure disk 43 transmits a force to the guide 45, the stopper 46, and the pivot base 41 by the film member 47 of the pressure switch unit 40. Press and at this time, as the guide pin 42 descends, the pressure spring 48 is pressed to turn the contact on. Subsequently, when the pressure is 32 kgf / cm 2 or more, the guide 45 is further lowered by the film member 47 and the high pressure disk 44 is pressed to invert. Then, the guide pin 42 moves to the inverted space by the pressure spring 48. The contact is turned off while moving upward by the reaction force of

When the pressure is reduced to 32 kgf / cm 2 or less, when the force transmitted to the guide 45 by the film member 47 becomes weaker than the reversal force of the high pressure disk 44, the high pressure disk 44 is returned. As the pin 42 descends, the pressure spring 48 is pressed to turn on the contact again.

In addition, when the pressure is further reduced to, for example, 2.0 kgf / cm 2 or less, when the force transmitted to the film member 47 becomes weaker than the repulsive force of the low pressure disk 43, the pivot base 41, the stopper 46, and the guide 45 are raised. And the contact is turned off while the guide pin 42 is raised by the repulsive force of the pressing spring 48.

As described above, the pressure switch portion 40 of the compressor protection valve operates normally at a refrigerant pressure of normal pressure (32 kgf / cm 2 to 2.0 kgf / cm 2), but the compressor operates at 32 kgf / cm 2 or more and 2.0 kgf / cm 2 or less. 70 is turned off.

However, when an abnormality occurs in the compressor 70 or when an abnormal high pressure occurs suddenly when a blockage part occurs in the air conditioning system, the compressor 70 is turned off and the pressure preventing unit 60 is operated at the same time. As shown in FIG. 3 through the outlet 22 of the seat cover 30 is raised to release the refrigerant.

More specifically, the seat cover 30 serves as a housing for installing the components of the pressure switch unit 40, and when the internal pressure of the compressor 70 rises abnormally, for example, 35 kgf / 2 cm to 42 kgf / cm 2, the elastic member 61 is pressurized, and as shown in FIG. 3, the seat cover 30 is raised, and refrigerant is ejected between the gaps e generated as the disk is raised. It is discharged out of the base 20 through the refrigerant discharge port 62a of the cap 62. When the refrigerant is released, the screw 23 of the base 20 may be turned to remove the compressor protection valve, and a new compressor protection valve may be installed. Therefore, the replacement of the compressor protection valve makes it possible to protect the compressor 70 from being lost.

As described above, the compressor protection valve according to the present invention has the following effects.

It detects abnormal low pressure and high pressure in the high pressure part of the air conditioning system and not only turns the compressor on / off, but also blows refrigerant at the abnormal high pressure to quickly protect the air conditioning system and the compressor.

For example, when the compressor is turned on at high speed, abnormally high pressure is generated inside the compressor, and after one or two rotations, the compressor is turned off by the operation of the pressure switch unit, which has an effect of warning this, and when the pressure is restored to the normal pressure. The compressor can be operated to increase the durability of the compressor.

When the condenser of the air conditioning system is clogged by foreign matter, the conventional system did not detect the high pressure, but the compressor having the highest pressure detects the high pressure, thereby turning off the compressor to protect the condenser.

In addition, the shorter wire spacing between the compressor and the switch improves responsiveness, thus protecting the compressor, eliminating the need for mounting switches and connectors on the receiver dryer, and acting as a valve and switch with a single valve structure. As a result, the manufacturing cost can be reduced, as well as the manufacturing simplification.

Although the present invention has been described with reference to one embodiment shown in the drawings, this is merely exemplary, and it will be understood by those skilled in the art that various modifications and equivalent embodiments are possible. Therefore, the true scope of protection of the present invention should be defined only by the appended claims.

Claims (4)

A base formed with an inlet port through which the refrigerant is introduced and an outlet port through which the refrigerant is discharged, and installed in the compressor; A seat cover provided between the inlet and the outlet to be elevated; A pressure switch unit disposed at the seat cover and a lower portion thereof to turn on / off an operation of the compressor according to the pressure of the refrigerant; And a pressure preventing unit installed at the outlet side of the upper seat cover to discharge the refrigerant through the outlet when the seat cover is elevated when the pressure of the compressor is abnormally increased. . The pressure switch of claim 1, A pivot base installed at one side of the inlet and having a through hole formed at a center thereof; A guide pin supported in the through hole and made of a predetermined insulating material; A low pressure disk and a high pressure disk installed on the upper and lower portions of the pivot base so as to be elastically biased to turn on / off the compressor; A guide installed in the lower portion of the high pressure disk to reduce the pressure received from the upper portion and to deliver the high pressure disk; A stopper installed at an edge of the guide to transmit the force transmitted from the upper portion to the pivot base; A film member installed below the guide and the stopper to maintain airtightness; A pressure spring supported by the guide pin and receiving a force generated by the action of the high and low pressure disks from the guide pin; A contact terminal grounded to the pressure spring; And a terminal member connected to the contact terminal and an external power source. The method of claim 2, Compressor protection valve, characterized in that the O-ring is installed on the lower side of the film member. The method of claim 1, wherein the pressure preventing unit, An elastic member installed on an upper portion of the seat cover and compressed and stretched when the seat cover is lifted; And a disk cap installed at an end of the discharge port and having a refrigerant discharge port communicating with the discharge port.