KR20030072493A - Heat exchanger of air conditioner for automobile - Google Patents

Abstract

PURPOSE: A heat exchanger is provided to prevent noises caused due to the compression of liquid refrigerant during the early stage of operation of air conditioner. CONSTITUTION: A heat exchanger comprises a header pipe(5); an inlet pipe(8) and an outlet pipe; a tube(6); a fin(7); and a liquid refrigerant cut-off unit(M) mounted at the inside of the inlet pipe in such a manner that the liquid refrigerant cut-off unit allows for flow of refrigerant during the operation of air conditioner and prevents the liquid refrigerant existing in the heat exchanger from entering a compressor during the stoppage of air conditioner. The liquid refrigerant cut-off unit includes a valve casing(10) where a power connection terminal(14) is mounted; a magnetic coil(11) arranged in the valve casing; a plunger(12) for opening/shutting a refrigerant flow channel; and a spring(13) having a side fixed at the valve casing and the other side fixed at the plunger.

Description

Heat exchanger for vehicle air conditioner {HEAT EXCHANGER OF AIR CONDITIONER FOR AUTOMOBILE}

The present invention relates to a heat exchanger for a vehicle air conditioner, and more particularly, a vehicle for preventing liquid refrigerant from flowing into a compressor when the air conditioner is stopped by installing a liquid refrigerant blocking unit on one side of an inlet and an outlet pipe of the condenser. A heat exchanger for an air conditioner.

1 is a view showing an installation state of a general vehicle air conditioning apparatus.

As illustrated, the vehicle air conditioner includes a compressor 1, a condenser 2, an expansion valve 3, and an evaporator 4, and the compressor 1 compresses a low pressure refrigerant gas to a high pressure and discharges it to the condenser 2. In addition, the condenser 2 condenses the refrigerant compressed to high pressure in the compressor 1 to be phase-changed, and the refrigerant discharged from the condenser 2 expands to a low pressure saturated state while passing through the expansion valve 3 and evaporator ( As it passes through 4), it absorbs the surrounding heat and changes its phase into a low pressure refrigerant gas. The low pressure refrigerant gas then flows back into the compressor 1 and is recycled.

2 is a block diagram of a general condenser.

As shown in the figure, the condenser 2 liquefies the high-temperature and high-pressure refrigerant conveyed by the compressor 1 by exchanging heat with the outside air, and a pair of header pipes 5 and 5a spaced at a predetermined interval and both ends are A plurality of tubes 6 connected to the header pipes 5 and 5a and equally spaced, a corrugated fin 7 interposed between the tubes, and a header pipe 5 and 5a are connected. It consists of inlet and outlet pipes 8 and 9.

In addition, a plurality of baffles (not shown) are installed inside the header pipes 5 and 5a to improve the condensation efficiency by allowing the refrigerant flow to be zigzag.

When the vehicle air conditioner configured as described above stops the operation of the air conditioner, each component of the air conditioner appears in various states.

That is, the condenser 2 is exposed to the outside and shows a rapid temperature rise. The compressor 1 is relatively exposed, but there is no change in temperature. The evaporator 4 has little exposure, but the temperature rise in the vehicle interior is relatively high. Little change in temperature.

In this case, when the refrigerant flows from the condenser 2 and the evaporator 4 to the compressor 1 side, and the liquid refrigerant flows into the compressor 1 and is driven during the initial operation of the air conditioner, not only noise is generated but also it is broken. have.

That is, the refrigerant of the condenser 2 and the evaporator 4 which are relatively hot and high pressure than the compressor 1 flows to the compressor 1.

The present invention has been made to solve such a conventional problem, and an object thereof is to install a liquid refrigerant blocking means on either side of a condenser inlet / outlet pipe to prevent the liquid refrigerant from entering the compressor when the air conditioner is stopped. A heat exchanger for an apparatus is provided.

1 is an installation state of a general vehicle air conditioner

2 is a block diagram of a general condenser

3 is a view showing a state in which a refrigerant flow path is opened as a first embodiment of a condenser provided with a liquid refrigerant blocking means according to the present invention.

Figure 4 is a first embodiment of the condenser provided with a liquid refrigerant blocking means according to the present invention, a view showing a state in which the refrigerant passage is closed.

5 is a view showing a state in which a refrigerant flow path is opened as a second embodiment of a condenser provided with a liquid refrigerant blocking means according to the present invention.

6 is a view showing a state in which a refrigerant flow path is closed as a second embodiment of a condenser provided with a liquid refrigerant blocking means according to the present invention.

7 is a perspective view showing the main parts of a second embodiment of the present invention;

8 is a third embodiment of a condenser provided with a liquid refrigerant blocking means according to the present invention, showing a state in which a refrigerant passage is opened.

9 is a third embodiment of a condenser provided with a liquid refrigerant blocking means according to the present invention, showing a state in which a refrigerant passage is closed.

(Explanation of symbols for the main parts of the drawing)

M: liquid refrigerant blocking means 10: valve casing

11: magnetic coil 12: plunger

13: Spring 14: Power connector

15: air conditioner switch 16: plate valve casing

16a: guide protrusion 17: opening and closing plate

17a: guide groove 18: spring

19: caulking unit 20: opening and closing ball

21: spring

In order to achieve the above object, the present invention provides a heat exchanger for a vehicle air conditioner including a header pipe, an inlet / outlet pipe, a tube, and a fin, wherein one side of the inlet / outlet pipe allows a refrigerant to flow during an air conditioner operation. When the air conditioner stops, the liquid refrigerant blocking means for preventing the liquid refrigerant existing in the heat exchanger from flowing into the compressor is installed.

In addition, the liquid refrigerant blocking means is a heat exchanger for a vehicle air conditioner, characterized in that formed integrally with the inlet pipe.

The liquid refrigerant blocking means may include a valve casing provided with a power connection terminal, a magnetic coil formed inside the valve casing, a plunger which moves forward and backward according to application of power of the magnetic coil, and one side of the valve casing. It is fixed to the valve casing, the other side is composed of a spring fixed to the plunger.

In addition, the power connection terminal is connected to the air conditioner switch.

In addition, the liquid refrigerant blocking means is formed on the inner circumferential surface of the valve valve casing formed with at least one guide projection having an inclined surface becomes smaller toward the flow direction of the refrigerant, and a guide groove fitted to the guide projection is formed, along the guide projection Opening and closing plate for opening and closing the opening and closing, and one side is fixed to the valve valve casing and the other side is composed of a spring fixed to the opening and closing plate.

Hereinafter, preferred embodiments of the present invention will be described in detail with reference to the accompanying drawings. Prior to the description of the present invention, a condenser composed of a header pipe (5) (5a), a tube (6), a corcate pin (7), and an inlet / outlet pipe (8) (9) is the same as that of the related art. Detailed description will be omitted, but only the liquid refrigerant blocking means installed in the inlet pipe 8, which is a feature of the present invention, and the same components as in the prior art are given the same reference numerals to prevent confusion of the description.

3 and 4 is a view showing a first embodiment of a condenser provided with a liquid refrigerant blocking means according to the present invention. Hereinafter, the liquid refrigerant blocking means will be described with reference to M.

As shown, the liquid refrigerant blocking means (M) is shown as being installed inside the inlet pipe (8) formed on one side of the header pipe (5), the liquid refrigerant blocking means (M) is a power connection terminal (14) Is provided with a valve casing 10, the magnetic coil 11 formed inside the valve casing 10, and the plunger 12 to move back and forth in response to the power supply of the magnetic coil 11 to open and close the refrigerant flow path; , One side is fixed to the valve casing 10, the other side is composed of a spring 13 fixed to the plunger 12.

The power connection terminal 14 is connected to the air conditioner switch 15.

In addition, the liquid refrigerant blocking means (M) is formed to form a fastening screw portion (10a) in the valve casing to be assembled after the brazing of the condenser, it is made to prevent the leakage of the refrigerant through the O-ring (10b).

That is, when the air conditioner switch 15 is turned on, the magnetic coil 11 electrically connected to the power connection terminal 14 is magnetized to pull the plunger 12 toward the magnetic coil 11, and by the plunger 12. While opening the closed refrigerant path to allow the flow of refrigerant from the compressor to the condenser, turning off the air conditioner switch 15 causes the compressed spring 13 to expand and the plunger 12 is returned. The flow path is closed to block the flow of refrigerant from the condenser to the compressor.

5 to 7 is a view showing a second embodiment of the condenser provided with a liquid refrigerant blocking means (M) according to the present invention.

As shown, the liquid refrigerant blocking means (M) of the second embodiment includes a plate valve casing (16) having at least one guide protrusion (16a) having an inclined surface on the inner circumferential surface of the refrigerant flow toward the refrigerant flow direction, and the guide protrusion ( The guide groove 17a is fitted to the 16 is formed, the opening and closing plate 17 to move up and down along the guide projection 16a to open and close the flow path, and one side is fixed to the plate valve casing 16 and the other side is It is composed of a spring 18 fixed to the opening and closing plate 17.

That is, when the air conditioner is driven, the guide groove 17a of the opening / closing plate 17 moves downward along the guide protrusion 16a by the high temperature and high pressure refrigerant pressure being pumped from the compressor to the condenser.

Then, since the guide protrusion 16a has a smaller inclined surface toward the lower side, a gap is generated between the guide groove 17a and the guide protrusion 16a to allow the flow of the refrigerant, while the spring of the air conditioner stops driving. By closing the opening and closing plate 17 to the upper side (18) to block the gap between the guide projection (16a) and the guide groove (17a) to block the refrigerant flow from the condenser to the compressor.

8 and 9 are views showing a third embodiment of the condenser provided with the liquid refrigerant blocking means (M) according to the present invention.

As shown, the liquid refrigerant blocking means M of the third embodiment forms a caulking portion 19 at the upper and lower ends of a predetermined length of the inlet pipe 8, and the opening and closing ball 20 and the spring in the caulking portion 19. It is the structure through 21.

That is, the opening and closing ball 20 moves downward according to the flow pressure of the compressor, so that the opening and closing ball 20 which is in contact with the upper caulking part 19 is released, and the refrigerant flow path is opened to coolant flow from the compressor to the condenser. When the air conditioner is stopped, the pressure applied to the opening / closing ball 20 is released and the opening / closing ball 20 is contacted with the upper caulking unit 19 by the restoring force of the spring 21 to close the refrigerant flow path. Thus, the refrigerant flow from the condenser to the compressor is blocked.

In the first to the third embodiments described above, the configuration in which the liquid refrigerant blocking means of the present invention is provided on the inlet pipe side of the condenser is described, but the liquid refrigerant blocking means of the present invention can be provided on the outlet pipe side of the condenser.

That is, when the air conditioner is stopped due to the characteristics of the refrigerant, the refrigerant remains not only in the heat exchanger but also in the pipe, and the liquid refrigerant in the pipe flows from the high pressure (condenser, evaporator) to the low pressure (compressor) due to the nature of the refrigerant flow path. It is possible to block the refrigerant flow by installing the liquid refrigerant blocking means of the present invention on the side.

As described above, the heat exchanger for a vehicle air conditioner includes a liquid refrigerant blocking means inside the inlet pipe of the condenser to block the inflow of the liquid refrigerant from the condenser to the compressor, thereby compressing the liquid refrigerant of the compressor during the initial operation of the air conditioner. Not only can prevent the noise, but also to prevent the risk of damage.

Claims (5)

In the heat exchanger for a vehicle air conditioner, comprising a header pipe (5) (5a), an inlet / outlet pipe (8) (9), a tube (6), and a fin (7), One side of the inlet and outlet pipes (8) and (9) allows the flow of the refrigerant during the operation of the air conditioner, while the liquid refrigerant blocking means for blocking the flow of the liquid refrigerant present in the heat exchanger when the air conditioner is stopped (M) Heat exchanger for a vehicle air conditioning apparatus characterized in that the installed. 2. The heat exchanger of claim 1, wherein the liquid refrigerant blocking means (M) is formed integrally with the inlet pipe (8). The liquid refrigerant blocking means (M) according to claim 1 or 2, wherein the liquid refrigerant blocking means (M) comprises a valve casing (10) provided with a power connection terminal (14), a magnetic coil (11) formed inside the valve casing (10), and A plunger 12 which opens and closes the refrigerant flow path by applying power to the magnetic coil 11 and one side is fixed to the valve casing 10 and the other side is a spring fixed to the plunger 12. Heat exchanger for a vehicle air conditioning apparatus, characterized in that consisting of 13). 4. The heat exchanger of claim 3, wherein the power connection terminal (14) is connected to an air conditioner switch (15). The liquid valve blocking means (M) according to claim 1 or 2, wherein the liquid refrigerant blocking means (M) has a plate valve casing (16) formed with at least one guide protrusion (16a) having an inclined surface that is smaller in the refrigerant flow direction on the inner circumferential surface; Guide grooves 17a are formed to be fitted to the guide protrusions 16a, and are moved up and down along the guide protrusions 16a to open and close the plate 17 to open and close the flow path, and one side of the plate valve casing 16. Heat exchanger for the vehicle air conditioner, characterized in that the other side is fixed and composed of a spring (18) fixed to the opening and closing plate (17).