KR100674180B1 - Wind Pressure Defrost Point Detection Device of Evaporative Heat Exchanger - Google Patents

Abstract

The present invention relates to a wind pressure defrosting time detection device of an evaporative heat exchanger for an air conditioning and heating device. An operation switch is provided.

Therefore, when the blowing pressure of the fan increases due to the increase in the frost state of the forced blow type evaporative heat exchanger and the blow amount decreases, the differential pressure operation switch is operated to perform defrosting operation. It is possible to eliminate the concept of the exchanger, thereby maximizing the thermal efficiency of the forced-air evaporative heat exchanger, and preventing overload of the fan to prevent component damage.

Description

Wind pressure defrost point of time detector device of evaporation heat exchanger for air conditioner

1 is a schematic view showing a system of a typical heat pump heating device

Figure 2 is a schematic side view showing a forced air evaporation heat exchanger for a conventional heat pump heating device

Figure 3 is a schematic side view showing a state in which the present invention wind pressure defrost sensor is installed in a forced air evaporation heat exchanger

4 to 6 is a perspective view, a cross-sectional view, an operating state cross-sectional view showing an embodiment of the wind pressure defrost sensor

7 to 13 are schematic views showing various embodiments of the wind pressure defrost sensor

* Description of the symbols for the main parts of the drawings *

11,31,51,111: forced air evaporative heat exchanger 12: fan

20,40,60,70,90,100,120: differential pressure switch 21,41,61,71,91,101: switch body

22,73,96,102: limit switch 23,72,92,103: wind pressure differential operation plate

80: suction volume control cap 81: cover

85: rotating plate 94: tension adjusting bolt

95: spring 104: heating heater

112: U trap 113: stopper

The present invention relates to a heat pump heating apparatus using a refrigeration refrigerating device and a freezing device, and more particularly, to detect a wind pressure defrost point of a forced air type evaporative heat exchanger that accurately detects a defrost time of a forced air type evaporative heat exchanger and controls the defrosting operation. Relates to a device.

As shown in FIG. 1, a general refrigeration apparatus and a heat pump heating apparatus using a refrigeration apparatus include a compressor (1) for compressing a refrigerant and a high temperature and high pressure refrigerant compressed from the compressor (1). A condensation heat exchanger (2) and a condensation fan (3) for condensing in a refrigerant state, and an expansion valve (4) for expanding a liquid refrigerant condensed from the condensation heat exchanger (2) and changing it into a refrigerant in a two-phase state of a liquid phase and a gas phase. And an evaporation heat exchanger 6 and an evaporation fan 7 for vaporizing and evaporating the two-phase refrigerant expanded through the expansion valve.

In the conventional refrigeration refrigerator and the heat pump heating apparatus using the refrigeration apparatus, when the power is applied, the refrigerant is introduced into the compressor (1), the compressed high-temperature and high-pressure refrigerant is introduced into the condensation heat exchanger (2) to the liquid and gaseous phase 2 The refrigerant is converted into a liquid phase at the outlet side of the condensation heat exchanger 2 by the continuous heat exchange. At this time, the condensation heat exchanger becomes an outdoor unit in the refrigeration refrigerating unit and releases the warmed air to the outside. . The air introduced into the condensation heat exchanger by the rotation of the condensation fan 3 exchanges heat with the high temperature and high pressure refrigerant and is discharged while the temperature is raised. Then, the liquid refrigerant condensed from the condensation heat exchanger (2) passes through the expansion valve (4), and the pressure and temperature are drastically reduced to change into two-phase refrigerants of liquid and gas and are introduced into the evaporation heat exchanger (6). At this time, the evaporative heat exchanger becomes an indoor unit in the refrigeration refrigerating unit and lowers the room temperature. In the heater pump heating device using the refrigeration unit, it becomes an outdoor unit and releases cold heat to perform heat exchange. The refrigerant in the two-phase state introduced into the evaporation heat exchanger 6 is evaporated into the refrigerant gas in the gas state while performing heat exchange, and then flows back into the compressor 1 to repeat the cycle.

At this time, since the heat exchange action in the forced-air evaporative heat exchanger (6) absorbs heat from the sucked air, a temperature difference occurs inside and outside the forced-air evaporative heat exchanger (6). When the temperature difference between the inside and outside of the predetermined degree or more occurs, the implantation (着 霜) occurs on the outer wall of the forced-air type evaporative heat exchanger (6). This frost layer acts as a heat resistance that prevents heat transfer between the air and the refrigerant, and increases the system resistance of the air by blocking the flow path of the air passing through the forced air evaporative heat exchanger (6). By reducing the amount of air flowed into the air to reduce the air-side heat transfer coefficient of the forced air type evaporative heat exchanger (6), it causes a decrease in the amount of heat transfer in the forced air type evaporative heat exchanger (6).

In order to prevent such a problem, a defrosting operation is performed in which a refrigerant flows in the reverse direction of a normal operation, or a defrosting operation is performed by operating a separate electric heater installed around a forced forced-evaporation heat exchanger.

In the conventional defrosting method of the forced blow type evaporative heat exchanger, the defrosting operation is operated at a predetermined time or the defrost heater is operated at a predetermined time to remove frost formed on the forced blow type evaporative heat exchanger.

However, this conventional defrosting method was not effective. That is, an important point in the defrost of the forced-air evaporative heat exchanger is the time when the state of landing in the forced-air evaporative heat exchanger gradually increases, increasing the blowing pressure of the fan and lowering the blowing efficiency. Therefore, the conventional defrosting device which defrosts every predetermined time did not find the optimum defrosting point, and the defrosting operation was frequently performed unnecessarily or defrosting after the optimal defrosting point, thus increasing the heat loss relatively. .

SUMMARY OF THE INVENTION An object of the present invention for solving the above problems is to provide a wind pressure defrosting point detection apparatus of a forced cooling type evaporative heat exchanger for a heat pump heating apparatus using a refrigeration apparatus and a refrigeration apparatus to perform a defrosting operation in an optimal state. have.

In order to achieve the above object, a wind pressure defrosting time detection device of a forced air evaporation heat exchanger for a heat pump heating device using the freezer refrigerating device and a refrigerating device, in a system having a forced air evaporation heat exchanger provided with a fan, It is characterized in that the differential pressure operation switch is installed to detect the load on the fan of the forced blow type evaporative heat exchanger of the system and to operate the defrosting operation.

Another feature of the wind pressure defrosting time detection device of the forced air type evaporative heat exchanger for a heat pump heating device using the refrigeration refrigerator and the freezing device, the differential pressure operation switch, is installed in the forced air type evaporative heat exchanger and the forced air type The limit switch is operated by a switch body connecting the inside and the outside of the evaporative heat exchanger, a limit switch installed inside the switch body and controlling a defrosting operation time point, and air connected to the limit switch and sucked into the switch body. The wind pressure differential working plate is made.

Another feature of the wind pressure defrosting time detection device of the forced air type evaporative heat exchanger for a heat pump heating device using the refrigeration refrigerator and the freezing device, the air pressure to adjust the operation time of the wind pressure difference operation plate on the switch body Differential operation plate adjusting means is further provided.

Another feature of the wind pressure defrosting time detection device of the forced air type evaporative heat exchanger for a heat pump heating device using the refrigeration refrigerator and the freezing device, the wind pressure difference operation plate adjusting means is coupled to one side of the switch body, the wind pressure It consists of a suction amount adjusting cap for adjusting the amount of air flowing into the operation plate side.

According to another aspect of the present invention, a wind pressure defrosting time detection device of a forced air type evaporative heat exchanger for a heat pump heating device using a refrigeration refrigerator and a refrigerating device may include: A spring elastically supporting to the opposite side of the, and is made of a tension adjusting bolt connected to the spring to adjust the tension of the spring.

According to another aspect of the present invention, there is provided a wind pressure defrosting time detection device of a forced air type evaporative heat exchanger for a heat pump heating device using a refrigeration refrigerator and a refrigerating device, to prevent malfunction of the differential pressure operation switch due to low temperature. The heating heater is further provided.

Another feature of the wind pressure defrosting time detection device of the forced air type evaporative heat exchanger for a heat pump heating device using the refrigeration refrigerator and the freezing device, when the differential pressure operation switch is installed on the bottom surface of the forced air type evaporative heat exchanger, A U-shaped trap is installed between the bottom of the forced blow type heat exchanger and the differential pressure operation switch so that foreign matters or moisture flows into the differential pressure operation switch.

The U-trap is penetrated by the lower end of the center so as to discharge foreign substances and water collected therein to the outside, and a plug is opened and closed at the penetrating portion of the U-trap.

Therefore, when the blowing pressure of the fan increases due to the increase in the frost state of the forced blow type evaporative heat exchanger and the blow amount decreases, the differential pressure operation switch is operated to perform defrosting operation. It is possible to eliminate the concept of the exchanger, thereby maximizing the thermal efficiency of the forced-air evaporative heat exchanger, as well as preventing overload of the fan to prevent component damage.

Specific features and advantages of the present invention will become more apparent from the following description taken in conjunction with the accompanying drawings.

Figure 3 is a schematic side view showing a state in which the air pressure defrosting time detection apparatus according to the present invention is installed in the forced air type evaporative heat exchanger 11 for a heat pump heating apparatus using a refrigeration refrigerator and a freezer, which is a fan 12 In the forced blow type evaporative heat exchanger 11 provided, a wind pressure defrosting time detection device including a differential pressure operation switch 20 is installed.

The differential pressure operation switch 20 is installed in a forced air type evaporative heat exchanger 11 for a heat pump heating device using a refrigeration apparatus and a freezer, and detects when the blowing pressure of the fan 12 is increased to operate defrosting. Play a role of As shown in FIGS. 4 and 5, the differential pressure operation switch 20 includes a switch body 21, a limit switch 22, and a wind pressure differential operation plate 23.

The switch body 21 has a plurality of parts installed therein and is installed in the forced blown type evaporative heat exchanger 11 to serve as an air passage connecting the outside to the inside of the forced blown type evaporative heat exchanger 11. The combination of the switch body 21 and the forced-air evaporative heat exchanger 11 allows the flange 21a of the switch body 21 to be coupled to the case of the forced-air evaporative heat exchanger 11 with bolts, nuts, rivets, or the like. It may also be combined in various ways to be described later.

The switch body 21 may be provided to have a circular cross section as shown in FIG. 4, but may be formed in a quadrangle or other various forms.

The limit switch 22 is installed in the switch body 21 and is operated when air is introduced into the switch body 21. That is, when the load is applied to the fan 12 and the air flow inside the forced air evaporation heat exchanger 11 is lowered due to the concept of the forced air evaporation heat exchanger 11, the switch body in which external air acts as an air passage ( 21 is introduced into the forced-air type evaporative heat exchanger 11, wherein the limit switch 22 is operated by the wind pressure difference operation plate 23 to be described later.

The wind pressure differential operation plate 23 is provided in the switch body 21 and connected to the limit switch 22. When the outside air flows into the switch body 21, the limit switch 22 is formed by the air flow. The limit switch 22 is operated by pushing to the side.

The wind pressure difference operation plate 23, the outer peripheral surface is preferably formed in the same shape as the inner peripheral surface of the switch body 21, the area of the outer peripheral surface should be formed smaller than the cross-sectional area of the inner peripheral surface of the switch body 21. do.

Here, the smaller the clearance between the outer circumferential surface of the wind pressure difference operation plate 23 and the inner circumferential surface of the switch body 21, the smaller the flow of air in the switch body 21, the operation of the differential pressure plate 23 is operated. That is, if the gap is small, the air passage therebetween is so small that the wind pressure difference operation plate 23 is operated even if the pressure difference between the inside and the outside of the forced air type evaporative heat exchanger 11 is relatively small.

On the contrary, the larger the clearance between the outer circumferential surface of the wind pressure differential operation plate 23 and the inner circumferential surface of the switch body 21, the greater the flow of air in the switch body 21 to operate the wind pressure differential operation plate 23. That is, when the gap is large, a relatively large load is applied to the fan 12, and a large pressure difference between the inside and the outside of the forced air type evaporative heat exchanger 11 is increased, so that a large amount of air is sucked in to operate the pressure difference operation plate 23.

Wind pressure defrost time detection device of the forced air evaporation heat exchanger for the heat pump heating device using the present invention the refrigeration refrigeration unit and the refrigeration unit of such a configuration, as shown in FIG. It is activated when an frost is generated in the blown evaporative heat exchanger (11). That is, when the amount of air flowing into the forced blow type evaporative heat exchanger 11 is reduced by the concept of the forced blow type evaporative heat exchanger 11, the load is applied to the fan 12, and accordingly, the external and forced blow type evaporative heat exchanger ( 11) Wind pressure difference is generated inside.

The wind pressure difference serves to suck the outside air into the forced air type evaporative heat exchanger 11, and the outside air is sucked into the forced air type evaporative heat exchanger 11 through the differential pressure operation switch 20.

The air flowing into the switch body 21 is pushed while hitting the wind pressure difference operation plate 23, and the wind pressure difference operation plate 23 rotates as shown in FIG. 6 to operate the limit switch 22.

When the differential pressure operation switch 20 is operated as described above, a defrosting operation is performed as in the prior art, and the defrosting operation causes the refrigerant of the heat pump heating apparatus using the refrigerating refrigerating device and the refrigerating device to flow opposite to the flow during the heating operation, It can also be defrosted by operating a separate electric heater installed around the forced air evaporative heat exchanger.

The wind pressure defrosting time detection device of the forced air type evaporative heat exchanger for a heat pump heating device using the present invention a refrigeration refrigerator and a freezer is loaded on the fan 12 when the state of the forced air type evaporative heat exchanger 11 is increased. The blowing amount is reduced while the air pressure is reduced, and a wind pressure difference is generated between the outside and the forced air type evaporative heat exchanger 11. At this time, the differential pressure operation switch 20 is operated by the wind pressure difference to perform defrosting operation. Therefore, the wind pressure defrosting time detection device of the present invention is not operated at every predetermined time unnecessarily, but the defrosting operation is performed when the air flow is not smooth due to the concept of the forced air evaporation heat exchanger (11). Therefore, by identifying the optimum defrost time can eliminate the concept of the forced air evaporation heat exchanger (11), thereby maximizing the thermal efficiency of the forced air evaporation heat exchanger.

In addition, according to the present invention, when the fan 12 is overloaded by the concept of the forced air type evaporative heat exchanger 11, the differential pressure operation switch 20 is immediately operated to solve the overload of the fan 12, thereby causing the fan 12 to be damaged. The problem is solved.

7 is a schematic cross-sectional view showing another embodiment of the wind pressure defrosting time detection device of the forced air type evaporative heat exchanger for a heat pump heating apparatus using the freezing refrigerator and the freezing apparatus, which is a switch of a differential pressure switch 40 A male screw portion 41a is formed in the body 41, and a female screw portion 31a is formed in the forced air exchanger 31 so that the male screw portion 41a of the switch body 41 is engaged. In the present invention, the male screw portion 41a of the differential pressure actuating switch 40 can be fastened to the female screw portion 31a of the forced blow type evaporative heat exchanger 31, thereby easily coupling them.

The present invention differs only from the structure of coupling between the forced air type evaporative heat exchanger 31 and the differential pressure operation switch 40 as compared to FIGS. 3 to 6.

FIG. 8 is a schematic cross-sectional view showing another embodiment of the present invention, in which a female thread portion 61a is formed on the switch body 61 of the differential pressure actuated switch 60, and a male thread portion is provided on the forced-air evaporative heat exchanger 51. A separate fastener 52 having a 53 formed therein may be coupled to the bolt 54. In the present invention, the female screw portion 61a of the differential pressure actuating switch 60 may be opposed to the male screw portion 53 of the fastener 52, and then coupled to each other. Here, the male screw portion may be integrally formed in the forced blow type evaporative heat exchanger without the fastener 52.

The present invention is different only from the structure of the coupling between the forced air type evaporative heat exchanger 51 and the differential pressure operation switch 60 compared to FIGS. 3 to 6 are the same as described above.

9 and 10 is a schematic cross-sectional view showing another embodiment of the present invention and a partial separation perspective view thereof, which means, the wind pressure differential operation plate adjusting means on the switch body 71 to adjust the operation timing of the differential pressure operation switch 70 This is further provided.

The wind pressure differential operation plate adjusting means is coupled to one side of the switch body 71 is made of a suction amount adjusting cap 80 for adjusting the amount of air flowing into the wind pressure differential operation plate 72, the suction amount adjusting cap 80, It consists of a cover 81 and a rotating plate 85.

The cover 81 is coupled to one end of the switch body 71 and three air holes 82 are formed radially. A coupling hole 83 is formed at the center of the cover 81, and a guide hole 84 is formed at one side.

The rotating plate 85 has a central axis 87 formed in the center thereof so as to be rotatably coupled to the coupling hole 83 of the cover 81, and is inserted into the guide hole 84 of the cover 81 at one side thereof. Handle 88 is formed to guide along this. In addition, three air holes 86 are formed in the rotating plate 85 so as to face the air holes 82 of the cover 81.

Therefore, by grasping the handle 88 of the rotating plate 85 and rotating it along the guide hole 84, the air holes 82 of the cover 81 and the air holes 86 of the rotating plate 85 match the size of the air passage. In this state, the air passages gradually decrease as the air holes 82 of the cover 81 and the air holes 86 of the rotating plate 85 are slightly crossed with each other.

By using the suction amount adjusting cap 80, it is possible to adjust the defrosting time of the forced air evaporation heat exchanger 11 of FIG. That is, the forced air evaporation heat exchanger 11 is relatively small in the state that the load on the fan 12 is not very large while the suction volume control cap 80 is opened to the maximum, forced air evaporation heat exchanger ( 11) The wind pressure difference between the inside and outside is not large. Therefore, the flow rate of the air passing through the air holes is very slow and the amount of air intake is too small to properly push the wind pressure differential operation plate 72, and thus does not operate the limit switch 73.

In this state, when the frost state of the forced-air evaporative heat exchanger 11 gradually increases and the wind pressure difference between the forced-air evaporative heat exchanger 11 and the external air gradually increases, the flow velocity passing through the air holes 82 and 86 is increased. And the flow rate is increased, and as a result, the force of the air pushing the wind pressure difference operation plate 72 is greater than the force when the wind pressure difference operation plate 72 is pushed to operate the limit switch 73.

In this way, when the air holes 82 and 86 of the suction amount adjusting cap 80 are opened to the maximum, the operation timing of the differential pressure operation switch 70 is delayed until the concept of the forced air evaporation heat exchanger 11 is sufficiently proceeded. You can.

On the contrary, when the air passages 82 and 86 of the suction amount adjusting cap 80 are staggered with each other to maintain the air passages with only a minimum air passage, the air passages are very narrow even if the load on the fan 12 of FIG. 3 is not very large. Because of this, the flow rate passing through it is relatively large, and accordingly, the force pushing the wind pressure differential operation plate 72 is increased by that amount to operate the differential pressure operation switch 70.

As such, when the air holes 82 and 86 of the suction amount adjusting cap 80 are opened a little, the differential pressure operation switch 70 is operated at the initial stage of the concept of the forced air evaporation heat exchanger 11.

The suction amount adjusting cap 80 may be configured such that the rotating plate 85 is rotated with respect to the cover 81 as described above, but may be configured such that the inner plate is fixed to the switch body and the outer cover is rotated. There may be three air holes 82 and 86, but less than three, or more than three.

11 is a schematic cross-sectional view showing another embodiment of the wind pressure differential operating plate adjusting means according to the present invention, which is a spring 95 for elastically supporting the wind pressure differential operating plate 92 to the opposite side of the limit switch 96. And, it is made of a tension adjusting bolt 94 is connected to the spring (95) to adjust the tension of the spring (95).

The wind pressure differential operation plate adjusting means, by tightening the tension adjusting bolt 94 to transfer the end portion to the spring 95 side, while the spring pressure increases, the operating pressure of the wind pressure differential operation plate 92 increases by that amount, and conversely, tension Loosening the adjusting bolt 94 and transferring the end portion to the opposite side of the spring 95 reduces the operating pressure of the wind pressure difference operation plate 92 while reducing the spring pressure.

As such, when the operating pressure of the wind-pressure differential operating plate 92 is adjusted by the wind-pressure differential operating plate adjusting means of the present invention, even if air of constant pressure and a constant speed are sucked into the switch body 91 of the differential pressure operating switch 90, The operation timing of the operation plate 92 can be adjusted.

Figure 12 is a schematic cross-sectional view showing another embodiment of the differential pressure switch 100 of the present invention, which is, around the switch body 101 of the differential pressure switch 100, the heating heater (to prevent a malfunction due to low temperature ( 104 is further provided.

The differential pressure switch 100 of the present invention prevents a problem in which parts are frozen and do not operate properly due to a low temperature around them. That is, when the temperature around the differential pressure operation switch 100 falls below an appropriate temperature, the heating heater 104 is operated so that the limit switch 102 and the wind pressure differential operation plate 103 operate smoothly. The interior is properly heated.

Figure 13 is a schematic side view showing another embodiment of the forced blow type evaporation heat exchanger 111 is installed in the wind pressure defrosting point detection apparatus of the present invention, the U-type trap 112 on the bottom of the forced blow type evaporation heat exchanger 111 The differential pressure switch 120 is installed on the upper end of the U-shaped trap 112.

This invention is suitable for the case where the differential pressure operation switch 120 is to be installed on the bottom surface of the forced-air evaporation heat exchanger (111). When the differential pressure operation switch 120 is directly installed on the bottom surface of the forced air evaporation heat exchanger 111 without the U-shaped trap 112, the water generated in the forced air evaporation heat exchanger 111 flows downward and the differential pressure operation switch 120 ) Will be introduced into the inside, the dust or foreign matter at the bottom of the differential pressure switch 120 will be sucked into the differential pressure switch 120 as it is.

Therefore, in order to prevent foreign matter or moisture from flowing into the differential pressure operation switch 120, a U-shaped trap 112 is installed on the bottom surface of the forced-air evaporative heat exchanger 111, and the differential pressure is provided on the top of the U-type trap 112. Install the operation switch (120). Here, the U-shaped trap 112 has a central lower end penetrated to discharge foreign substances and water collected therein to the outside, and a stopper 113 is coupled to the penetrating portion of the U-shaped trap 112.

In the forced air type point detection heat exchanger 111 in which the wind pressure defrost time point detection device is installed, the differential pressure actuating switch 120 is installed under the forced air type evaporative heat exchanger 111, but moisture is transferred to the differential pressure actuating switch 120 side. Inflow is prevented, and since the air intake port of the differential pressure operation switch 120 faces upward, dust on the floor does not flow when intake of outside air.

According to the present invention as described above, when the blowing state of the forced blow type evaporative heat exchanger increases and the blowing pressure of the fan increases and the blowing amount decreases, the differential pressure operation switch is automatically performed to perform the defrosting operation, The identification of the forced air type evaporative heat exchanger can be eliminated, thereby maximizing the thermal efficiency of the forced air type evaporative heat exchanger and preventing the overload of the fan to prevent component damage.

Claims (8)

A wind pressure defrosting time detection device of an evaporative heat exchanger for a heating and cooling device having a forced blow type evaporative heat exchanger provided with a fan, In the forced air type evaporative heat exchanger of a heat pump heating apparatus using a refrigeration refrigerator and a refrigerating device, a differential pressure operation switch is installed to detect a load on a fan and operate a defrosting operation. A wind pressure defrosting time detection device of an evaporative heat exchanger for a heating and cooling device, characterized in that a heating heater is further provided to prevent a malfunction of an operation switch. According to claim 1, wherein the differential pressure operation switch, A switch body installed in the forced air evaporation heat exchanger and connecting the inside and the outside of the forced air evaporation heat exchanger; A limit switch installed inside the switch body and controlling a defrosting operation time point; A wind pressure defrosting time detection device of an evaporative heat exchanger for a heating and cooling device, characterized in that the air pressure difference operating plate is connected to the limit switch and operates the limit switch by air sucked into the switch body. The method of claim 2, wherein the switch body, Wind pressure defrost time detection device of the evaporative heat exchanger for a heating and cooling device, characterized in that the wind pressure differential operation plate adjusting means is further provided to adjust the operation time of the wind pressure differential operation plate. According to claim 3, The wind pressure difference operating plate adjusting means, The wind pressure defrost time detection device of the evaporative heat exchanger for a heating and cooling device, characterized in that the suction volume adjusting cap is coupled to one side of the switch body to adjust the amount of air flowing into the wind pressure difference operation plate side. According to claim 3, The wind pressure difference operating plate adjusting means, Wind pressure defrost point of time detection of the evaporative heat exchanger for a heating and cooling device, characterized in that consisting of a spring for elastically supporting the wind pressure difference operation plate to the opposite side of the limit switch and a tension adjusting bolt connected to the spring to adjust the tension of the spring. Device. delete The method of claim 1, When the differential pressure actuating switch is installed on the bottom of the forced air evaporation heat exchanger, U is provided between the bottom of the forced air type heat exchanger and the differential pressure actuating switch so as to prevent foreign matter from flowing into the differential pressure actuating switch or to prevent water from flowing down. Wind pressure defrost time detection device of the evaporative heat exchanger for air conditioning and heating device characterized in that the trap is installed. The method of claim 7, wherein the U-shaped trap, A wind pressure defrost point detection device of an evaporative heat exchanger for heating and cooling device, characterized in that the lower end of the center is penetrated to discharge foreign substances and water collected therein, and a stopper is opened and closed at the penetrating portion of the U-shaped trap.

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