KR100603191B1 - Heat pump cycle - Google Patents

Abstract

The disclosed heat pump cycle includes a compressor for compressing a refrigerant and converting the refrigerant into a high temperature and high pressure refrigerant gas; A four-way valve for selectively adjusting the flow direction of the refrigerant discharged from the compressor in accordance with the change in the cooling / heating mode; An outdoor heat exchanger that exchanges the outdoor air and the refrigerant, an outdoor expansion valve that converts the liquid refrigerant at high temperature and high pressure into a refrigerant having a low temperature and low pressure by throttle expansion, and an opening to prevent refrigerant from entering the outdoor expansion valve in the cooling mode. An outdoor unit including an outdoor check valve closed to allow refrigerant to flow into the outdoor expansion valve at a time; An indoor heat exchanger for exchanging indoor air and refrigerant, an indoor expansion valve for converting a liquid refrigerant of high temperature and high pressure into a refrigerant having low temperature and low pressure by throttle expansion, and an open valve in a heating mode and a refrigerant flowing in a cooling mode and closing in a cooling mode. And an indoor unit including an indoor check valve to shut off the air, and the indoor unit further includes first, second, and third check valves so that the contact method between the refrigerant and the air passing through the indoor heat exchanger is opposite. Characterized in that.

Counter, Check Valve, Heat Exchanger, Heat Pump

Description

Heat pump cycle

1 is a schematic diagram conceptually illustrating a flow of a refrigerant of a general heat pump cycle;

Figure 2 is a schematic diagram conceptually showing the flow of the refrigerant in the cooling mode of the heat pump cycle according to an embodiment of the present invention,

Figure 3 is a schematic diagram conceptually showing the flow of the refrigerant in the heating mode of the heat pump cycle according to an embodiment of the present invention.

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

110 ... Compressor 120 ... Four-way valve

130 ... outdoor unit 131 ... outdoor expansion valve

132 ... outdoor heat exchanger 133 ... outdoor check valve

140 ... Indoor unit 141 ... Indoor expansion valve

142 ... indoor heat exchanger 143,144,146 ... 1,2,3 check valve

145 ... Indoor check valve

The present invention relates to a heat pump, and more particularly to a heat pump cycle that can increase the heat exchange efficiency of the refrigerant and air through the heat exchanger.

Heat alone cannot move from a low temperature to a high temperature, and it takes work to move heat.

Just as a pump is a machine that pumps water from a low position to a high position, a heat pump is a device that can transfer heat from a low temperature to a high temperature.

Heat pumps are classified into compression type, chemical formula, absorption type, adsorption type, etc. according to the principle of absorbing heat and radiating heat.

Such a heat pump is one of the air conditioners that can both cool and heat by reversing the flow of refrigerant in the cooling cycle of the air conditioner. The heat pump is gradually used according to the advantages that can be used regardless of the season. The area is expanding.

The structure of the heat pump is composed of a compressor, an evaporator, a condenser, and an expansion valve, as in a refrigerator.The operating principle is to heat a high temperature and high pressure refrigerant from a compressor and then send it to a condenser for heating. It is configured to repeat the cycle of flushing to the outside of low temperature.

In contrast to cooling, the system is configured so that the condenser acts as an evaporator and the evaporator acts as a condenser so that the condensed refrigerant is heat exchanged with hot outside air to cool the target point to be cooled.

1 is a view showing a conventional heat pump cycle.

Referring to the drawings, a conventional heat pump includes a compressor 21, a four-way reversing valve 22, indoor and outdoor heat exchangers 10 and 20, indoor and outdoor check valves 11 and 24, and It comprises an outdoor capillary tube (12, 25), an accumulator (23) and a receiver tank (26).

Here, the refrigerant compressed by the high-pressure steam refrigerant in the compressor 21 is introduced into the four sides 22, the four sides 22 is the refrigerant introduced from the compressor 21 during the cooling cycle to the outdoor heat exchanger (20). Branching and branching to the indoor heat exchanger (10) during the heating cycle.

Hereinafter, the cooling cycle and the heating cycle of the heat pump will be described briefly.

First, in the cooling cycle of the heat pump, the refrigerant introduced into the indoor heat exchanger 10 is dissipated to change into a high pressure liquid refrigerant and simultaneously controlled by the outdoor check valve 24 so as not to flow into the outdoor capillary tube 25. The low pressure liquid refrigerant is introduced into the indoor capillary tube 12 and is converted into a low pressure liquid refrigerant. The low pressure liquid refrigerant is vaporized in the indoor heat exchanger 10 to absorb surrounding heat and flows into the four sides.

At this time, the accumulator 23 is installed between the compressor 21 and the four sides 22 to prevent the liquid refrigerant from flowing into the suction pipe and the compressor 21.

In addition, a receiver tank 26 is installed between the outdoor heat exchanger 20 and the outdoor capillary tube 25.

At this time, the low-temperature, low-pressure gas refrigerant passing through the accumulator 23 is maintained in the gas state without phase change to liquid by the heat of the high-temperature, high-pressure liquid refrigerant passing through the receiver tank 26.

Next, during the heating cycle, the refrigerant introduced into the indoor heat exchanger 10 is radiated to heat the room and is changed to a high pressure liquid refrigerant, and the refrigerant controlled by the indoor check valve 11 is transferred to the indoor capillary tube 12. Instead of being introduced into the outdoor capillary tube 25, it is converted into a low pressure liquid refrigerant and vaporized into a low pressure steam refrigerant through the outdoor heat exchanger 20.

At this time, the low temperature and low pressure liquid refrigerant passing through the accumulator 23 through the receiver tank 26 is evaporated to a gas state by the heat of the high temperature and high pressure liquid refrigerant passing through the receiver tank 26.

However, in such a conventional heat pump cycle, there is a problem that the heat contact method of the air and the refrigerant does not become counter flow in any one of the cooling and heating cycles.

Therefore, there is a problem that the power loss required by the heat transfer efficiency is lowered.

The present invention has been made to solve the above problems, and an object of the present invention is to provide a heat pump cycle capable of maximizing heat transfer efficiency by allowing the refrigerant and air to contact each other in an opposite flow.

Other objects and advantages of the invention will be described below and will be appreciated by the embodiments of the invention. In addition, the objects and advantages of the present invention can be realized by means and combinations indicated in the claims.

The heat pump cycle according to the present invention includes a compressor for compressing a refrigerant and converting the refrigerant into a high temperature and high pressure refrigerant gas; Four-way valve for selectively adjusting the flow direction of the refrigerant discharged from the compressor in accordance with the change of the cooling and heating mode; An outdoor heat exchanger for exchanging the outdoor air and the refrigerant, an outdoor expansion valve for converting a liquid refrigerant of high temperature and high pressure into a refrigerant having a low temperature and low pressure state by throttle expansion, and an open expansion valve to prevent the refrigerant from flowing into the outdoor expansion valve in the cooling mode. An outdoor unit including an outdoor check valve closed to allow refrigerant to flow into the outdoor expansion valve in mode; An indoor heat exchanger for exchanging indoor air and refrigerant, an indoor expansion valve for converting a liquid refrigerant of high temperature and high pressure into a refrigerant having low temperature and low pressure by throttle expansion, and an open valve in a heating mode and a refrigerant flowing in a cooling mode and closing in a cooling mode. And an indoor unit including an indoor check valve to block the gas, wherein the indoor unit further includes first, second, and third check valves such that a contact method between the refrigerant and air passing through the indoor heat exchanger is opposite. Characterized in that to be.

Here, in the heat pump cycle, it is preferable that the first check valve is opened and the second and third check valves are closed during cooling.

In addition, during heating, the second and third check valves are preferably opened, and the first check valve is closed.

The terms or words used in this specification and claims are not to be construed as being limited to their ordinary or dictionary meanings, and the inventors may appropriately define the concept of terms in order to best describe their invention. It should be interpreted as meaning and concept corresponding to the technical idea of the present invention based on the principle that the present invention.

Therefore, the embodiments described in the specification and the drawings shown in the drawings are only the most preferred embodiment of the present invention and do not represent all of the technical idea of the present invention, various modifications that can be replaced at the time of the present application It should be understood that there may be equivalents and variations.

2 is a schematic diagram conceptually showing the flow of the refrigerant in the cooling mode of the heat pump cycle according to an embodiment of the present invention, Figure 3 is a flow diagram of the refrigerant in the heating mode of the heat pump cycle according to an embodiment of the present invention It is a schematic diagram conceptually.

First, referring to FIGS. 2 and 3, the heat pump 100 according to an embodiment of the present invention may include a compressor 110, a four-way valve 120, an outdoor unit 130, and an indoor unit 140. It is configured to include.

Here, the outdoor unit 130 is a low-temperature low-pressure refrigerant (R) by throttling the outdoor heat exchanger 132 for exchanging the outdoor air and the refrigerant (R) and the liquid refrigerant (R) of high temperature and high pressure The outdoor expansion valve 131 and the outdoor check valve 133 are opened so that the refrigerant does not flow into the outdoor expansion valve 131 in the cooling mode and the refrigerant flows into the outdoor expansion valve 131 in the heating mode. It is configured to include).

In addition, the indoor unit 140 converts the indoor heat exchanger 142 for exchanging the indoor air and the refrigerant R and the liquid refrigerant R having a high temperature and high pressure to a refrigerant R having a low temperature and low pressure by throttle expansion. The main opening is opened in the heating expansion valve 141 and the heating mode, the refrigerant (R) flows and closed in the cooling mode to pass through the indoor check valve 145 and the indoor heat exchanger (142) to block the flow of the refrigerant (R). The first, second, and third check valves 143, 144, and 146 are configured to face the refrigerant R and the air contacting method.

In addition, although not shown, the heat pump 100 according to an embodiment of the present invention includes an accumulator and a receiver tank for separating the refrigerant R in the liquid phase condensed by heat exchange.

Hereinafter, the heat pump cycle according to an embodiment of the present invention will be described in detail.

First, referring to FIG. 2, the refrigerant R discharged through the compressor 110 during the cooling cycle flows into the outdoor heat exchanger 132 by adjusting the four-way valve 120, and the outdoor heat exchanger 132. While passing through it is in thermal contact with the outdoor air is converted to the liquid refrigerant (R), and passes through the outdoor check valve 133 is introduced into the indoor unit 140.

At this time, the refrigerant R condensed through the outdoor heat exchanger 132 by the outdoor check valve 133 does not flow into the outdoor expansion valve 131.

The refrigerant R introduced into the indoor unit 140 passes through the second check valve 144 that is opened, passes through the indoor expansion valve 141, and is conditioned by the axial expansion to cool the liquid R having a low temperature and low pressure. Flows into the heat exchanger (142).

At this time, the indoor heat exchanger 142 serves as an evaporator, thereby cooling the room by lowering the temperature of the air flowing into the room while the refrigerant (R) of low temperature and low pressure evaporates.

The refrigerant R passing through the indoor heat exchanger 142 passes through the opened first check valve 143 and flows into the compressor 110 through the four-way valve 120.

Here, the indoor check valve 145 and the third check valve 146 are closed so that the refrigerant R does not flow into the indoor check valve 145 and the third check valve 146.

Since the refrigerant R flowing into the indoor unit 140 maintains a high pressure, the refrigerant R having a low pressure passing through the indoor heat exchanger 142 flows through the first check valve 143. And does not flow into the indoor check valve 145.

This is because the high pressure refrigerant R is introduced into the conduit connected through the indoor check valve 145.

Similarly, since the refrigerant having passed through the indoor expansion valve 142 flows into the inlet of the indoor heat exchanger 142, the refrigerant of the low pressure R having passed through the first check valve 143 is connected to the third check valve ( 146) cannot flow through.

Next, referring to FIG. 3, the refrigerant R discharged through the compressor 110 during the heating cycle passes through the third check valve 146 by adjusting the four-way valve 120 to allow the indoor heat exchanger 142. Flows into.

At this time, the indoor heat exchanger 142 serves as a condenser and heats the room by raising the temperature of the air flowing into the room while the refrigerant R in the high temperature and high pressure condenses.

The refrigerant R passing through the indoor heat exchanger 142 is introduced into the indoor unit 130 through the indoor check valve 145.

At this time, the first and second check valves 143 and 144 are closed so that refrigerant does not flow into the first and second check valves 143 and 144.

Because the refrigerant (R) having a high temperature and high pressure has already flowed into the four-way valve 120 in the conduit connected through the first check valve 143, the refrigerant does not flow into the first check valve 143.

Similarly, since the refrigerant R passing through the third check valve 146 flows into the inlet of the indoor heat exchanger 142, the refrigerant does not flow into the second check valve 144.

In this way, the first, second, and third check valves 143, 144, and 146 are provided so that the contact method of the refrigerant R and the air can always be opposed in both cooling and heating.

More specifically, the refrigerant R passing through the indoor heat exchanger 142 and air may be contacted by counter flow, thereby maximizing thermal efficiency.

As described above, the heat pump cycle according to the present invention provides the following effects.

First, in the cooling and heating modes, there is an advantage that the contact between the refrigerant and air always forms a counter flow to prevent heat loss and maximize the efficiency.

In addition, since the difference in heat transfer efficiency between counter flow and parallel flow is 20 to 30%, the heat transfer efficiency can be improved.

As mentioned above, although this invention was demonstrated by the limited embodiment and drawing, this invention is not limited by this, The person of ordinary skill in the art to which this invention belongs, Of course, various modifications and variations are possible within the scope of equivalent claims.

Claims (3)

A compressor for compressing the refrigerant to convert the refrigerant into a high temperature and high pressure refrigerant gas; Four-way valve for selectively adjusting the flow direction of the refrigerant discharged from the compressor in accordance with the change of the cooling and heating mode; An outdoor heat exchanger for exchanging the outdoor air and the refrigerant, an outdoor expansion valve for converting a liquid refrigerant of high temperature and high pressure into a refrigerant having a low temperature and low pressure state by throttle expansion, and an open expansion valve to prevent the refrigerant from flowing into the outdoor expansion valve in the cooling mode. An outdoor unit including an outdoor check valve closed to allow refrigerant to flow into the outdoor expansion valve in mode; An indoor heat exchanger for exchanging indoor air and refrigerant, an indoor expansion valve for converting a liquid refrigerant of high temperature and high pressure into a refrigerant having low temperature and low pressure by throttle expansion, and an open valve in a heating mode and a refrigerant flowing in a cooling mode and closing in a cooling mode. In the heat pump cycle having an indoor unit including an indoor check valve for blocking the, The indoor unit further includes a first check valve, a second check valve, and a third check valve so that a contact method between the refrigerant passing through the indoor heat exchanger and air is opposed to each other. When cooling, the first check valve is opened, the second and third check valve is closed, When heating, the second and third check valve is open, characterized in that the first check valve is closed, Heat pump cycle. delete delete

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