KR100685755B1 - Apparatus for preventing freeze of heat exchanger in heat pump air-conditioner - Google Patents

Abstract

The present invention relates to a cryoprevention apparatus of a heat exchanger for an air conditioner, comprising: a compressor for compressing a refrigerant in a low temperature and low pressure gas state suctioned from an inlet and discharging it through a discharge port in a high temperature and high pressure gas state; It is connected to each of the indoor heat exchanger and the outdoor heat exchanger and the heat exchanger to exchange heat with the air by the operation of the blower, respectively, and a passage for connecting the discharge and suction inlet of the compressor to the indoor heat exchanger and the outdoor heat exchanger, respectively, A heater pump air conditioner including a four-way valve that is switched to change, comprising: a reservoir containing an antifreeze; At least one pressurizing pump pressurizing the antifreeze provided in the reservoir; And at least one injection nozzle receiving antifreeze from the pressure pump and spraying the outdoor side heat exchanger to prevent freezing of the outdoor side heat exchanger during heating.

Air Conditioner, Heat Exchanger, Freeze Protection.

Description

Apparatus for preventing freeze of heat exchanger in heat pump air-conditioner}

1 is a configuration diagram schematically showing the structure of a general heater pump air conditioner,

Figure 2 is a schematic diagram showing a freezing prevention device of the heat exchanger for an air conditioner according to the present invention.

Explanation of symbols on the main parts of the drawing

6; Outdoor side heat exchanger 7; air blower

10; Reservoir 20; Moisture Remover

30; Pressurized pump 40; Spray nozzle

50; Auxiliary pressure pump 60; Drain pan

70; First piping 80; Second pipe

90; Control unit 100; 3rd pipe

110; drainpipe

The present invention relates to an apparatus for preventing freezing of a heat exchanger for a heater pump air conditioner.

Generally, heat naturally moves from the high temperature side to the low temperature side, but in order to move the heat from the low temperature side to the high temperature side, some action must be applied from the outside. This is the action of the heat pump.

Heat pump air conditioners combine cooling and refrigeration by reversibly using heat transfer mechanisms to the refrigeration cycle consisting of compression, condensation, depressurization and evaporation of refrigerant.

Conventional air-conditioning combined heat pump air conditioner is composed of a compressor (1), a four-way valve (2), an indoor side heat exchanger (3) and its blower (4), an expansion mechanism (5), an outdoor side heat exchanger as shown in FIG. (6) and its blower (7).

The compressor 1 has a suction port 1b and a discharge port 1a, and compresses a refrigerant in a low temperature low pressure gas state sucked from the suction port 1b to discharge the gas in a high temperature high pressure gas state. Discharge through 1a).

The four-way valve 2 has two independent passages 2a and 2b connecting the discharge port 1a and the inlet port 1b of the compressor 1 to the indoor heat exchanger 3 and the outdoor heat exchanger 6, respectively. And a switching operation to change the flow of the coolant according to a mode of cooling operation and heating operation according to a user's selection.

The indoor heat exchanger (3) is located indoors, and serves as an evaporator for evaporating a refrigerant of low temperature and low pressure liquid state into a gas state in a cooling operation mode, and a refrigerant of high temperature and high pressure gas state in a heating operation mode. It acts as a condenser to condense it into a room temperature and high pressure liquid state, and acts as a heat exchanger with the surrounding air in response to the enthalpy change of the refrigerant.

The indoor blower 4 is operated to promote a heat exchange action as an evaporator or a condenser of the indoor heat exchanger 3 while simultaneously generating cold or warm air necessary for the room.

The expansion mechanism 5 is a capillary that is connected between the indoor heat exchanger 3 and the outdoor heat exchanger 6 to depressurize the liquid refrigerant at room temperature and high pressure, which is transferred from one side, to the liquid state at low temperature and low pressure. .

The outdoor side heat exchanger 6 is located on the outdoor side as opposed to the indoor side heat exchanger 3 and performs heat exchange with the surrounding air as a condenser during the cooling operation and as an evaporator during the heating operation.

The outdoor blower 7 is then operated to promote heat exchange (as a condenser or evaporator) of the outdoor heat exchanger 6.

In Fig. 1, arrows indicate the flow of the coolant, the solid line represents the cooling operation, and the dotted line represents the respective refrigerant flow during the heating operation.

Cooling operation and heating operation mode is changed to the switching of the four-way valve (2) according to the user's selection and then the flow of refrigerant is changed.

1 is a case where the four-way valve 2 is switched to the cooling operation mode.

That is, in the cooling operation mode, the refrigerant is discharged from the compressor (1) and then transferred to the outdoor heat exchanger (6) via the four-way valve (2), through the expansion mechanism (5) from the outdoor heat exchanger (6) The solution is transferred to the indoor heat exchanger (3) and then sucked into the compressor (1). When the heating operation mode is changed, the flow of the refrigerant is reversed (in the direction of the dashed arrow) with the cooling operation.

In the heating operation mode, the refrigerant flowing into the outdoor side heat exchanger is in a liquid state. The heat required for the liquid refrigerant to evaporate into the gaseous state is taken from the outside air.

Therefore, when the outside air temperature is lowered, the evaporation is not smooth. Accordingly, the liquid component is increased in the refrigerant flowing into the indoor heat exchanger, thereby greatly reducing the heating capacity.

Substantially, when the outside air temperature drops below 0 ° C. in which the water freezes, frost is attached to the outdoor heat exchanger, which makes the heating operation almost impossible.

In order to solve the above problems, it has been recently designed to have a defrost mode to be reversed for a predetermined time from the heating mode to the cooling mode again. In this way, when the switch to the defrost mode can remove the frost attached to the outdoor heat exchanger.

However, while operating in the defrost mode as described above, the cold air is discharged from the indoor side heat exchanger, thereby lowering the heating efficiency of the room and at the same time discomforting residents living in the room.

The present invention has been made to solve the above problems, it is an object of the present invention to provide a freeze protection device for a heat exchanger for a heater pump air conditioner that can effectively prevent the frost is attached to the outdoor heat exchanger in the heating mode.

According to an aspect of the present invention for achieving the above object, the compressor for compressing the refrigerant of the low-temperature, low-pressure gas state sucked from the inlet and discharged through the discharge port in a high-temperature, high-pressure gas state, and connected to the compressor and the pipe An indoor heat exchanger and an outdoor heat exchanger, each of which exchanges air with air by the operation of a blower, and a passage connecting the discharge and intake ports of the compressor to the indoor heat exchanger and the outdoor heat exchanger, respectively, to change the flow of the refrigerant during heating. A heater pump air conditioner including a four-way valve to be switched, comprising: a storage tank accommodating antifreeze; At least one pressurizing pump pressurizing the antifreeze provided in the reservoir; And at least one injection nozzle receiving antifreeze from the pressure pump and spraying the outdoor side heat exchanger to prevent freezing of the outdoor side heat exchanger during heating, wherein the at least one injection nozzle is electrically connected to the pressure pump and the blower of the outdoor side heat exchanger. After the blower of the outdoor heat exchanger is operated, the pressurized pump is controlled to be turned on to spray the antifreeze in the reservoir to the outdoor heat exchanger through the injection nozzle, and the operating time of the blower is If the input time exceeds, the control unit for controlling the pressurized pump to the on-state to stop the blower and to spray the antifreeze through the injection nozzle again, characterized in that it further comprises preventing the freezing of the heat exchanger for the air conditioner Provide the device.

delete

The apparatus further includes a moisture remover to remove moisture from the antifreeze provided to the injection nozzle in the reservoir.

A drain pan is further provided below the outdoor heat exchanger to recover the antifreeze injected from the injection nozzle, and is connected to provide the recovered antifreeze to the moisture remover.

And at least one auxiliary pressurizing pump provided between the drain pan and the water remover to pressurize the antifreeze recovered from the drain pan and electrically connected to the control unit.

The water remover is connected to the sewer pipe to discharge the removed water to the outside.

Hereinafter, with reference to the accompanying drawings will be described a preferred embodiment of the refrigerant superheat degree improving apparatus of the heater pump air conditioner according to the present invention.

First, the description of the indoor side heat exchanger, the outdoor side heat exchanger, the expansion mechanism, the four-way valve and the compressor constituting the heater pump air conditioner is already described in the technical field of the present invention and the prior art of the field. Detailed description will be omitted here, and the following description will be mainly focused on the components of the heater pump air conditioner which is closely related to the freezing prevention device of the heat exchanger for the heater pump air conditioner according to the present invention.

2 is a block diagram schematically showing a freezing prevention device of the heat exchanger for a heater pump air conditioner according to the present invention.

1 and 2, the freezing prevention device of the heat exchanger for the heater pump air conditioner is a compressor for compressing the refrigerant of the low-temperature, low-pressure gas state sucked from the suction port and discharges it through the discharge port in the high-temperature, high-pressure gas state (1), an indoor side heat exchanger (3) and an outdoor side heat exchanger (6), which are connected to the compressor (1) by pipe and heat exchange with air by the blowers (4, 7), respectively, and the compressor (1). Heater pump air having a four-way valve (2) which has a passage for connecting the discharge port and the suction port of the internal heat exchanger (3) and the outdoor side heat exchanger (6) and is switched to change the flow of the refrigerant during heating In the conditioner, a reservoir 10, a pressure pump 30, and an injection nozzle 40 are included.

First, the reservoir 10 contains an antifreeze liquid.

In general, antifreeze is an alcohol-free liquid having a low freezing point used in winter so that the coolant of an automobile engine does not freeze.

In the present invention, it is preferable to use a relatively high viscosity antifreeze.

The reason for using the highly viscous antifreeze will be described in detail in the description of the injection nozzle 40 below.

The pressure pump 40 is to pressurize the antifreeze provided in the reservoir (10). In the embodiment, the pressure pump 40 is one, but may be provided with two or more as necessary.

The pressure pump 40 is preferably provided in the first pipe 70 to pressurize the antifreeze discharged from the water remover 20 to the injection nozzle 40 side.

The injection nozzle 40 receives the antifreeze from the reservoir 10 to prevent freezing of the outdoor heat exchanger 6 during heating and sprays it to the outdoor heat exchanger 6.

In the embodiment, although only one injection nozzle 40 is shown, two or more injection nozzles 40 may be provided so that the antifreeze is more evenly sprayed onto the surface of the outdoor side heat exchanger 6.

In addition, although the injection nozzle 40 is located only in the upper part of the outdoor side heat exchanger 6 in an embodiment, you may place the injection nozzle 40 separately in a lower part or a side part.

In the present invention, it is preferable that the antifreeze injected into the injection nozzle 40 has a relatively high viscosity. When the antifreeze is injected into the outdoor heat exchanger 6 through the injection nozzle 40, the antifreeze is injected into the outdoor heat exchanger ( This is to make it easier to adhere to the surface of 6).

When the antifreeze is injected into the outdoor heat exchanger 6 as described above, a thin antifreeze film is formed on the surface of the outdoor heat exchanger 6, which prevents the freezing of the outdoor heat exchanger 6.

As such, the freezing of the outdoor heat exchanger 6 is prevented, and thus, there is no need to operate in a defrost mode as in the prior art, thereby maximizing the heating efficiency of the room and at the same time, making the residents living in the room comfortable. .

A water remover 20 is further provided to remove water from the antifreeze provided to the injection nozzle 40 in the reservoir 10. Since the moisture remover 20 is a well-known technique, a detailed description thereof will be omitted here.

In an embodiment, the water remover 20 is connected to the injection nozzle 40 to the first pipe 70, the drain pan 60 is connected to the second pipe 80, the reservoir 10 ) Is connected to the third pipe (100).

The water remover 20 removes water from the antifreeze flowing from the reservoir 10 through the third pipe 100, and sprays the antifreeze liquid from which the water is removed through the first pipe 70 again. In addition, the water remover 20 removes water from the antifreeze flowing through the second pipe 80 in the drain pan 60 described below, and the antifreeze from which the water has been removed is reconnected to the first pipe 70. Through to provide to the injection nozzle (40). Water removed from the water remover 20 is preferably discharged to the outside through the sewage pipe (110).

A drain pan 60 is installed below the outdoor side heat exchanger 6 to recover the antifreeze injected from the injection nozzle 40 and connected to provide the recovered antifreeze to the water remover 20. Equipped.

The drain pan 60 serves to recover the antifreeze that is not completely fixed to the surface of the outdoor heat exchanger 6 or that is not dropped or sprayed from the injection nozzle 40 to the outdoor heat exchanger 6.

And it is preferable that the auxiliary pressure pump 50 is further provided in the second pipe (80).

The auxiliary pressure pump 50 serves to pressurize the antifreeze discharged from the drain pan 60 to provide to the moisture remover 20. In the embodiment, only one auxiliary pressure pump 50 may be installed, but two or more may be installed.

On the other hand, the control unit 90 is further provided to be electrically connected to the blower 7, the pressure pump 30, the auxiliary pressure pump 50 of the outdoor heat exchanger (6).

The control unit 90 operates the pressure pump 30 to spray the antifreeze in the reservoir to the outdoor heat exchanger 6 through the injection nozzle 40 after the blower 7 of the outdoor heat exchanger 6 is operated. Control on.

In addition, when the operating time of the blower 7 exceeds the preset time, the controller 90 stops the blower 7 and again pressurizes the pressurized pump 30 to spray the antifreeze through the injection nozzle 40. Control on.

Operation and operation of the freezing prevention device of the heat exchanger for a heater pump air conditioner under the control of the controller 90 are as shown in FIG. 2.

First, as shown in FIG. 1, when the blower 7 operates in the outdoor side heat exchanger 6 in the heating mode, the controller 90 controls the pressure pump 30 and the auxiliary pressure pump 50 for a predetermined time. Start up.

That is, when the pressure pump 30 is operated, the antifreeze in the reservoir 10 is directed to the injection nozzle 40 via the water remover 20.

The antifreeze is injected into the outdoor heat exchanger 6 through the injection nozzle 40.

The antifreeze injected into the outdoor heat exchanger 6 forms a film on the surface of the outdoor heat exchanger 6.

On the other hand, the auxiliary pressure pump 50 does not form an antifreeze film in the outdoor heat exchanger (6) so that the antifreeze falling from the drain pan 60 to the water remover (20).

Meanwhile, the controller 90 turns off the pressure pump 30 and the auxiliary pressure pump 50 after a predetermined time so that the antifreeze is no longer injected through the injection nozzle 40.

On the other hand, the controller 90 when the time that the blower 7 of the outdoor side heat exchanger 6 is operated exceeds the preset time, that is, exceeds the freezing time of the previously inputted outdoor side heat exchanger 6. If so, the blower 7 of the outdoor side heat exchanger 6 is stopped.

After the blower 7 is stopped, the control unit 90 operates the pressure pump 30 and the auxiliary pressure pump 50 for a predetermined time. The antifreeze is circulated back to the above process by the operation of the pressure pump 30 and the auxiliary pressure pump 50.

The present invention relates to a freeze protection device of a heat exchanger for a heater pump air conditioner, and by spraying an antifreeze to an outdoor heat exchanger to form an antifreeze film on the surface of the outdoor heat exchanger, in the heating mode without performing the defrost mode as in the prior art. Since the outdoor heat exchanger can be prevented from freezing, there is an excellent effect of maximizing the heating efficiency of the indoor and at the same time allowing the occupants to always live in a comfortable space.

Claims (6)

A compressor for compressing refrigerant in a low-temperature and low-pressure gas state suctioned from an inlet, and discharging the gas through a discharge port in a high-temperature, high-pressure gas state; an indoor heat exchanger connected to the compressor and a pipe to heat exchange with air by operating a blower; A heater pump air conditioner including an outdoor heat exchanger, and a four-way valve having a passage connecting the discharge and suction ports of the compressor to the indoor heat exchanger and the outdoor heat exchanger, respectively, the valve being switched to change the flow of refrigerant during heating. A reservoir containing an antifreeze; At least one pressurizing pump pressurizing the antifreeze provided in the reservoir; And At least one injection nozzle receiving antifreeze from the pressure pump to spray the outdoor side heat exchanger to prevent freezing of the outdoor side heat exchanger during heating, The pressurized pump and the blower of the outdoor heat exchanger are electrically connected to each other, and after the blower of the outdoor heat exchanger is operated, the pressurized pump is sprayed to spray the antifreeze in the reservoir to the outdoor heat exchanger through the injection nozzle. And a control unit for controlling the pressurized pump to be in an on state so as to be controlled in an on state, and when the operation time of the blower exceeds a preset time, stop the blower and inject antifreeze through the injection nozzle again. Freezing prevention device of the heat exchanger for air conditioners, characterized in that. delete The method of claim 1, And a water remover to remove water from the antifreeze provided to the injection nozzle in the reservoir. The method of claim 3, wherein The air conditioner of the heat exchanger, characterized in that it further comprises a drain pan which is installed in the lower portion of the outdoor side heat exchanger to recover the antifreeze injected from the injection nozzle, and connected to provide the recovered antifreeze to the water remover. Freeze protection. The method of claim 4, wherein Freezing prevention of the heat exchanger for an air conditioner, characterized in that it further comprises at least one auxiliary pressure pump which is provided between the drain pan and the water remover and electrically connected to the control unit to pressurize the antifreeze recovered from the drain pan. Device. The method of claim 5, The moisture eliminator is freezing prevention device of the heat exchanger for air conditioner, characterized in that connected to the sewer pipe to discharge the removed moisture to the outside.

Images