KR100504249B1 - Cooling and heating system of air conditioner - Google Patents

Abstract

The present invention relates to a cooling and heating system in an air conditioner configured to cool or heat a refrigerant discharged from a compressor without installing an outdoor unit or an auxiliary heat source by a heat exchanger that functions as a condenser or an evaporator by a four-way valve. It is about. The present invention provides a compressor for converting a refrigerant into a high temperature and high pressure state, a four-way valve for switching the refrigerant from the compressor according to a cooling or heating mode, and a condenser or evaporator connected to the four-way valve. Each of the first and second heat exchangers, the first and second solenoid valves having a flow path connecting the second and third heat exchangers, coupled in parallel to open and close the flow paths, and the first and second solenoid valves. First and second expansion valves coupled to the flow path to convert the refrigerant at high temperature and high pressure into refrigerant at low temperature and low pressure, and a circulation pump and a flow control valve are respectively installed at the flow path connected to the second and third heat exchangers. And a water tank for providing and circulating cooling water to the second and third heat exchangers, and condensed water generated in a cooling mode connected to a flow path of the first heat exchanger. It consists of a drain tank equipped with a level sensor to detect the water level of the condensate.

Description

Cooling and heating system of air conditioner

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a cooling and heating system in an air conditioner. More specifically, the refrigerant discharged from a compressor without a separate outdoor unit or auxiliary heat source is used to control the function of a condenser or an evaporator by a four-way valve. The present invention relates to a cooling and heating system in an air conditioner configured to perform cooling or heating by being discharged into a room through a heat exchanger selectively performed.

Commonly used air conditioners for both cooling and heating provide cold air in the room by carrying the heat of the room to the outside during cooling, while providing warm air by transporting the heat of outdoor to the room during the heating. consist of.

As an air conditioner for performing such a function, for example, a number of technologies are known, such as in Korean Patent No. 0224271 (registered on July 7, 1999). That is, the air conditioner disclosed in this publication is provided with a compressor for compressing refrigerant gas and converting it into a high temperature and high pressure state, and the compressor is provided with four-way valves switched according to the cooling and heating modes. And an indoor and outdoor heat exchanger functioning as a condenser and an evaporator, and an expansion valve disposed between them to reduce the high temperature and high pressure refrigerant to a low temperature and low pressure state.

Therefore, in the cooling mode, the high-temperature / high-pressure refrigerant gas discharged from the compressor flows to the outdoor heat exchanger acting as a condenser by the four-way valve, and the refrigerant, which has become a high-temperature / high-pressure liquid state by the operation of the blower fan, passes through the expansion valve. It enters the indoor heat exchanger that acts as an evaporator at low temperature and low pressure, and cool air is generated by the operation of the blower fan to cool the room. Again, the low temperature and low pressure gas refrigerant is transferred to the compressor through the four-way valve. Inhalation is achieved to achieve a cooling cycle.

In addition, in the heating mode, as described above, the refrigerant gas discharged from the compressor flows to the indoor heat exchanger acting as a condenser by means of four-way valves, and the heat can be heated by the blower fan to heat the room. Through the expansion valve, the pressure is reduced and flows into the outdoor heat exchanger which acts as an evaporator. The heat exchange is performed by the blower fan so that the refrigerant is evaporated and sucked back into the compressor through the four-way valve to form a heating circulation cycle.

By the way, in the prior art as described above, since the indoor unit and the outdoor unit are usually manufactured separately, not only the manufacturing cost is increased, but also the piping work for connecting them to each other is required, and the installation is subject to spatial constraints.

In addition, when the outside temperature in winter falls below 0 ° C, moisture in the outside air condenses on the surface of the outdoor unit, causing a rapid decrease in heating efficiency. Therefore, an auxiliary heat source operated by gas or electricity is installed. There is a problem that the heating circulation cycle must be operated after the defrosting operation is performed.

In recent years, in consideration of these problems, a lot of cooling and heating systems have been developed that can perform cooling and heating functions without requiring an outdoor unit, and as such technology, for example, Korean Patent No. 307262 (2001.8. 20 registration) is disclosed.

This technology is to provide a cooling water supplied from the water tank by a separate water pump by installing a water spray plate on the condenser installed inside the case constituting the cold, heater, and to cool the condenser on the upper side of the case A condenser fan is installed to exhaust the air.

Therefore, after cooling the considerable heat generated in the process of the refrigerant discharged from the compressor passing through the condenser by the cooling water and the air, the cooling action is performed by the evaporator fan while circulating the evaporator, and the water tank during heating The heat generated from the condenser is blown into the room without heating to allow heating.

However, in the prior art thus constructed, since the cooling water is sprayed to the condenser from the water tank mounted in the case through the water spray plate and circulated back to the water tank, it is generated in a device requiring quiet operation. Of course, there is a problem that the cooling efficiency is considerably lowered, as well as the noise to be avoided.

The present invention has been made in view of the above-described conventional problems, and an object of the present invention is to configure an additional air-cooled heat exchanger and two water-cooled heat exchangers so as to circulate an appropriate amount of cooling water supplied from a water tank. Not only does not install outdoor unit or auxiliary heat source, but also provides cooling and heating system in air conditioner that can maximize its capacity by evaporation and condensation in two stages.

A feature of the present invention for achieving the above object is to switch the refrigerant discharged from the compressor flowing along the flow path to each heat exchanger side selectively performing the function of a condenser or an evaporator by a four-way valve, In a cooling and heating system in an air conditioner that cools or heats air by releasing air into a room by a blower fan, a compressor for converting a refrigerant into a high temperature and high pressure state, and a refrigerant from the compressor for cooling or heating mode. A four-way valve for switching according to the first and second heat exchangers connected in series to be connected to one channel of the four-way valve and functioning as a condenser or an evaporator, and a condenser or the other channel connected to the other channel of the four-way valve. And a third heat exchanger that functions as an evaporator, and a flow path connecting the second and third heat exchangers. At the same time, the first and second solenoid valves coupled to each other in parallel to open and close the respective flow paths, and the respective flow paths of the first and second solenoid valves to convert the high temperature / high pressure refrigerant into the low temperature / low pressure refrigerant. A first and second expansion valves, and a circulation pump and a flow control valve are respectively installed in flow paths connected to the second and third heat exchangers, and a water tank for providing and circulating cooling water to the second and third heat exchangers; And a condensed water, which is connected by the first heat exchanger and a flow path, to store condensed water generated in a cooling mode, and is configured with a drain tank having a level sensor to detect a full state of the condensed water.

Here, the first to third heat exchanger is configured to act as an air-cooled and water-cooled two-stage evaporator and a water-cooled condenser in the cooling mode, and is configured to act as an air-cooled and water-cooled two-stage condenser and a water-cooled evaporator in the heating mode. The first heat exchanger provides cold and warm air according to cooling and heating modes by a blower fan installed at a rear end thereof, and controls the heat source during condensation and evaporation by cooling water flowing to the second heat exchanger and the third heat exchanger. It is configured to do so.

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

First, FIGS. 1A and 1B are front and side views schematically illustrating a cooling and heating system in an air conditioner according to the present invention, wherein the refrigerant is heated at a lower end of the case 11 constituting the cooling and heating unit 10. The compressor 12 which converts into a high pressure state is provided, and the four-way valve 13 which switches a refrigerant according to a cooling or heating mode is provided in the upper end part of this compressor 12.

In addition, one flow path of the four-way valve 13 is connected to the first and second heat exchangers 14 and 15 coupled in series to perform a function as a condenser or an evaporator. A third heat exchanger 16 which functions as a condenser or an evaporator is connected to the side passage.

Here, the first to third heat exchangers 14, 15 and 16 act as air-cooled and water-cooled two-stage evaporators and water-cooled condensers in the cooling mode, and air-cooled and water-cooled two-stage condensers in the heating mode. It is configured to act as a water-cooled evaporator.

In addition, the first heat exchanger 14 provides cold and warm air according to the cooling and heating modes by the blowing fan 17 installed at the rear end thereof, and the second heat exchanger 15 and the third heat exchanger 16 are provided. It is configured to control the heat source required for condensation and evaporation by the cooling water flowing through

As shown in FIGS. 2 and 3, the second and third heat exchangers 15 and 16 have flow paths connecting them to each other, and a first coupled in parallel to each other to open and close each flow path. And second solenoid valves 18a and 18b, wherein the first and second solenoid valves 18a and 18b are coupled to respective flow paths to convert the refrigerant at high temperature and high pressure into a refrigerant at low temperature and low pressure. First and second expansion valves 19a and 19b are provided.

On the other hand, the second and third heat exchangers (15, 16) is connected to the water tank 20 for providing and circulating cooling water, the circulation pump between the second and third heat exchangers (15, 16) 21 is mounted, and a flow regulating valve 22 is mounted between the third heat exchanger 16 and the water tank 20.

In addition, the bottom surface of the case 11 is connected by the first heat exchanger 14 and the flow path to store the condensation water generated in the cooling mode, and at the same time by the water level level sensor 23 for detecting the full water condition The drain tank 24 comprised so that an alarm can be provided is provided so that attachment and detachment are possible.

Referring to the operational relationship to the cooling and heating system in the air conditioner configured as described above are as follows.

First, in the cooling mode, the third heat exchanger 16 acts as a condenser while the first solenoid valve 18a is closed and the second solenoid valve 18b is open as shown in FIG. The four-way valve 13 is connected to the discharge side of the compressor 12, and the first and second heat exchangers 14 and 15 act as evaporators and are connected to the suction side of the compressor 12 through the four-way valve 13. The cooling fan 17 provided at the rear end of the first heat exchanger 14 can cool the room.

That is, the high-temperature, high-pressure refrigerant gas discharged from the compressor 12 is sent to the third heat exchanger 16 through the four-way valve 13 and from the water tank 20 by the operation of the circulation pump 21. It is liquefied by the action of the circulating cooling water, and becomes a liquid state of high temperature and high pressure.

This liquid refrigerant expands through the second solenoid valve 18b through the second expansion valve 19b and flows into the second heat exchanger 15 and the first heat exchanger 14 in a state where the pressure drops. At the same time, it is vaporized in two stages.

Therefore, as the cooling air is generated by the blowing fan 17 installed at the rear end of the first heat exchanger 14, the air is cooled in the room, and the second heat exchanger 15 and the first heat exchanger 14 are cooled. The vaporized low-temperature gas refrigerant is sucked back into the compressor 12 through the four-way valve 13 to achieve a cooling circulation cycle.

And, the condensation water generated in the first heat exchanger 14 is stored in the drain tank 24 provided on the bottom surface of the case 11, the water level sensor 23 provided in the drain tank 24 By detecting the water condition of the condensed water by the alarm, the system is automatically stopped operation at this time, so that after the condensed water in the drain tank 24 is discarded, the system is started again.

Next, in the heating mode, as shown in FIG. 3, the first heat exchanger 14 and the second heat exchanger 14 are opened while the first solenoid valve 18a is open and the second solenoid valve 18b is closed. The unit 15 acts as a condenser and is connected to the discharge side of the compressor 12 via the four-way valve 13, and the third heat exchanger 16 acts as an evaporator to the compressor 12 through the four-way valve 13. It is connected to the suction side, and can be heated indoors by the blowing fan 17 provided in the rear end of the said 1st heat exchanger 14. As shown in FIG.

That is, the high-temperature, high-pressure refrigerant gas discharged from the compressor 12 is sequentially sent to the first heat exchanger 14 and the second heat exchanger 15 through the four-way valve 13, and at the same time the circulation pump 21 By the operation of the liquefied by the action of the cooling water or the blowing fan 17 circulated from the water tank 20 to become a high-temperature, high-pressure liquid state and heating can be implemented as the hot air is generated by the blowing fan 17. .

The liquid refrigerant expands past the first expansion valve 19a through the open first solenoid valve 18a, flows into the third heat exchanger 16 in a pressure-reduced state, and evaporates and vaporizes.

In addition, the low-temperature, low-pressure gaseous refrigerant vaporized in the third heat exchanger 16 is sucked back into the compressor 12 through the four-way valve 13 to form a heating circulation cycle.

As described above, according to the cooling and heating system of the air conditioner according to the present invention, it is composed of one air-cooled heat exchanger and two water-cooled heat exchangers capable of circulating an appropriate amount of cooling water supplied from the water tank, and a separate outdoor unit. In addition, it is possible to maximize its capacity by not providing an auxiliary heat source, as well as by two steps of evaporation and condensation.

That is, it is possible to obtain the cold or hot air actually required from the air-cooled heat exchanger, and the water-cooled heat exchanger serves to supply the heat source required for condensation and evaporation. Since it can be evaporated internally through the circulation of the cooling water without exhausting, it becomes inherent in thermal equilibrium so that a separate exhaust for the generated heat source is unnecessary.

In particular, in the case of cooling, the secondary evaporation temperature in the air-cooled evaporator is set low by setting the superheat degree of the rear end of the water-cooled evaporator of the expansion valve for cooling so that the secondary evaporation temperature is low.

1A and 1B are front and side views schematically showing a cooling and heating system in an air conditioner according to the present invention;

2 is a piping diagram for explaining a refrigerant flow in a cooling mode in the cooling and heating system;

3 is a piping diagram for explaining a refrigerant flow in the heating mode in the cooling and heating system.

<Description of Symbols for Main Parts of Drawings>

10: cold, radiator 11: case

12: compressor 13: four-way valve

14: first heat exchanger 15: second heat exchanger

16: 3rd heat exchanger 17: blower fan

18a, 18b: first and second solenoid valves 19a, 19b: first and second expansion valves

20: water tank 21: circulation pump

22: flow control valve 23: water level sensor

24: drain tank

Claims (3)

The refrigerant discharged from the compressor flowing along the flow path is switched to each heat exchanger side which selectively performs the function of a condenser or an evaporator by a four-way valve, and the heat-exchanged air is discharged into a room by a blower fan for cooling or heating. In the cooling and heating system in the air conditioner, A compressor 12 for converting the refrigerant into a state of high temperature and high pressure, Four-way valve 13 for switching the refrigerant from the compressor 12 in the cooling or heating mode, First and second heat exchangers 14 and 15 connected in series to one of the four-way valves 13 and connected in series to function as a condenser or an evaporator, A third heat exchanger 16 connected to the other flow path of the four-way valve 13 and serving as a condenser or an evaporator; First and second solenoid valves 18a and 18b coupled to each other in parallel with each other so as to open and close each flow path while having flow paths connecting the second and third heat exchangers 15 and 16; First and second expansion valves 19a and 19b coupled to respective flow paths of the first and second solenoid valves 18a and 18b to convert the refrigerant at a high temperature / high pressure state into a refrigerant at a low temperature / low pressure state; A circulation pump 21 and a flow regulating valve 22 are mounted in flow paths connected to the second and third heat exchangers 15 and 16, respectively, and the coolant is supplied to the second and third heat exchangers 15 and 16. Water tank 20 for circulating to provide, A drain tank 24 connected with the first heat exchanger 14 and a flow path to store condensation water generated in a cooling mode, and having a water level level sensor 23 to detect a full state of the condensation water. Cooling and heating system in the air conditioner, characterized in that consisting of. 2. The first to third heat exchangers (14, 15, 16) according to claim 1, act as air-cooled and water-cooled two-stage evaporators and water-cooled condensers in the cooling mode, and air-cooled and water-cooled two in the heating mode. However, the cooling and heating system of the air conditioner, characterized in that it is configured to act as a condenser and a water-cooled evaporator. The heat exchanger (14) according to claim 1 or 2, wherein the first heat exchanger (14) provides cold and warm air according to the cooling and heating modes by a blower fan (17) installed at the rear end thereof. And the cooling water flowing to the third heat exchanger (16) to control the heat source during condensation and evaporation.