KR100582252B1 - Heatpump system with a plurality of cycles - Google Patents

Abstract

The present invention relates to a heat pump system, in particular a plurality of expansions connected in parallel between the condenser (23) and the evaporator (25), each having a different coefficient of expansion, evaporator 25, compressor (C), condenser (23) It has an inflator 26 composed of pipes (N1-Nn) to have a plurality of cycles, and the plurality of expansion pipes (N1-Nn) according to the outside air temperature detected by the controller 27 by the outside air temperature sensor (So). One of the expansion pipes (N1-Nn) selected from the control is to control the electronically controlled directional valve 24 to be connected to the system. The present invention can maximize the efficiency of the system because it can selectively operate the optimal cycle according to the external temperature conditions in one system.

Heat Pump, Multiple Cycles, Multiple Expansion Pipes, Parallel Connection, Controller, Electronic Control Valve

Description

Heat pump system with a plurality of cycles

1 is a schematic diagram of a conventional heat pump system,

2 is a schematic diagram when a heat pump system according to the present invention is used as a heating device,

3 is a schematic diagram of a case where the heat pump system according to the present invention is used as a cooling device.

※ Explanation of code about main part of drawing ※

C: Compressor 22: Refrigerant Directional Control Valve

23: condenser 24: electronically controlled directional valve

25: evaporator 26: inflator

N1, N2, .., Nn: Expansion tube So: Ambient air temperature sensor

Si: room temperature sensor 27: controller

The present invention relates to a heat pump system, and more particularly to a compressed heat pump system having a plurality of cycles.

As shown in FIG. 1, a heat pump system generally includes four elements of a low temperature heat exchanger including an evaporator 5, a compressor C, a condenser 3, and an expander 4. In the process of circulating the compressor (C), the condenser (3), the expander (4), and the evaporator (5), the refrigerant absorbs the heat of the room in the evaporator (5) to cool the room. While the refrigerant passes through the compressor (C), the evaporator (5), the expander (4) and the condenser (3) sequentially, it is to heat the room by the latent heat of condensation emitted by the condenser (3).

However, the conventional heat pump system as described above is designed to be used when the external heat source is in a certain condition due to the characteristics that should be used for both cooling and heating. Therefore, in the case of cold weather in which the outside temperature falls below -10 ° C or in the case of the cold weather in which the outside temperature rises above 35 ° C, various operating disorders are caused.

That is, when used as a heating device, the temperature of the evaporator installed outdoors in the cold weather is very low, the heat absorption is absorbed by the evaporator is reduced, the heating performance is sharply reduced, the evaporator freezes to interfere with heat transfer. In this case, liquid refrigerant that has not been vaporized in the evaporator flows into the compressor, causing the compressor to overload, causing damage to the compressor. On the other hand, when used as a cooling device, the superheated steam in the hot air with a very high outside temperature There is a problem to reduce the compression efficiency and to shorten the life of the compressor to flow, fresh gas flow into the evaporator to reduce the function of the evaporator.

The present invention is designed to solve the disadvantages of the conventional heat pump system, having a plurality of cycles in one system to optimally maintain the efficiency of the system in response to the conditions of the external heat source, the temperature of the external heat source The aim is to provide a heat pump system in which the system can operate without failure even under very high or very low conditions.

The present invention for achieving the above object is a refrigerant direction control valve for directionalizing to circulate the evaporator, compressor, condenser, expander, the refrigerant compressed in the compressor in the order of evaporator, expander, condenser or in the order of condenser, expander, evaporator In the heat pump system comprising:

The inflator has a different expansion coefficient, each consisting of a plurality of expansion pipes connected in parallel between the condenser and the evaporator, the outside air temperature sensor for detecting the outside temperature and the outside air temperature detected by the outside air temperature sensor The controller further comprises a controller for controlling the electronically controlled direction switching valve such that any one of the plurality of expansion tubes is connected to the system.

The present invention configured as described above is provided with a plurality of cycles in one system to selectively operate the optimum cycle according to the external temperature conditions, the system configuration is simple and can maintain the system efficiency optimally in response to various external conditions have.

Hereinafter, an embodiment of a heat pump system according to the present invention will be described in detail according to the accompanying drawings.

Figure 2 is a schematic configuration diagram of an example in which the heat pump system of the present invention is used as a heating device. As shown in FIG. 2, the refrigerant is compressed to a high temperature / high pressure steam in the compressor C, and the high temperature / high pressure refrigerant compressed in the compressor C is passed through the directional control valve 22 to condenser 23. ) Is released into heat and condensed by heat exchange with indoor air. The refrigerant condensed in the condenser 23 expands to a low temperature and low pressure while passing through the expander 26, and then flows into the evaporator 25. The evaporator 25 absorbs heat from outside air and vaporizes the compressor again. To C).

The expander 26 is composed of a plurality of expansion tubes (N1-Nn) connected in parallel between the condenser 23 and the evaporator 25, these plurality of expansion tubes (N1-Nn) is an electronically controlled direction switching valve ( 24 is alternatively connected to the condenser 23 according to the direction controlled by the electronic control direction switching valve 24 is switched according to the control signal output from the controller 27 in accordance with the outdoor temperature and the room temperature Control the flow direction of the refrigerant.

The indoor temperature sensor (Si) for detecting the indoor temperature and the outdoor temperature sensor (So) for detecting the outside temperature are provided indoors and outdoors, respectively, and the indoor temperature sensor (Si) and the outdoor temperature sensor (So) Each of the detected room temperature and outside air temperature is provided to the controller 27.

The controller 27 presets the temperature range divided into various ranges, and compares the outside temperature detected by the external temperature sensor So with the preset temperature range as described above to determine the temperature range to which the outside temperature belongs. The control signal is applied to the electronically controlled direction switching valve 24 so that the expansion pipes N1-Nn having expansion coefficients corresponding to the determined temperature range are connected to the condenser 23. The electronically controlled direction switching valve 24 controls one expansion pipe (N1-Nn) selected in accordance with the control signal of the controller 27 to connect the condenser 23 and the evaporator 25.

As described above, the heat pump system of the present invention, which is used as a heating device, changes the refrigerant expansion coefficient of the expander 26 according to the change of the outside air temperature when the outside air temperature is changed to absorb the refrigerant flowing into the evaporator 25. It can maintain the optimum condition, which can increase the performance of the heat pump system. Particularly, in a cold period in which the outside air temperature is maintained below minus 10 ° C, the refrigerant is expanded through the expansion tube Nn having the largest expansion coefficient and controlled to be introduced into the evaporator 25 so that the liquid refrigerant is generated in the evaporator 25 so that the compressor The phenomenon which flows into (C) is prevented.

On the other hand, Figure 3 is a system configuration diagram for the case where the heat pump system of the present invention is used as a cooling device.

The cooling device according to the present invention is made by circulating a refrigerant in a direction opposite to the refrigerant circulation direction of the heating device, as shown in FIG. 3, wherein the refrigerant is compressed to a high temperature / high pressure steam in the compressor (C), The refrigerant of high temperature and high pressure compressed in step (C) flows into the condenser 25 (corresponding to the evaporator in the heating device) arranged outdoors through the direction control valve 22 to release heat to the outside and condensate. The refrigerant condensed in the condenser 25 is directionally controlled by the electronically controlled direction switching valve 24 to expand at a low temperature and low pressure while passing through the expander 26, and then disposed in the room. Corresponding to the same), and the evaporator 23 absorbs heat from the room to vaporize and then flows back into the compressor C. The evaporator 23 cools the room by absorbing heat from the room while evaporating the refrigerant.

In the air conditioner, the expander 26 is composed of a plurality of expansion tubes N1-Nn connected in parallel between the condenser 25 and the evaporator 23, and the plurality of expansion tubes N1-Nn are in the electronic control direction. It is alternatively connected to the condenser 25 according to the direction controlled by the switching valve 24, and the electronically controlled direction switching valve 24 is switched according to the control signal output from the controller 27 according to the outside temperature. To control the flow direction of the refrigerant.
The outside temperature sensor So for detecting the outside temperature is provided outdoors, and provides the controller 27 with the outside temperature detected by the outside temperature sensor So.

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Even in this case, the controller 27 sets the temperature range subdivided into various ranges in advance, and compares the outside temperature detected by the external temperature sensor So with the preset temperature range as described above. The temperature range is determined, and a control signal is applied to the electronically controlled direction switching valve 24 such that an expansion pipe N1-Nn having an expansion coefficient corresponding to the temperature range of the outside air temperature thus determined is connected to the condenser 23. do. The direction switching valve 24 connects the condenser 23 and the evaporator 25 through one expansion tube (N1-Nn) selected according to the control signal of the controller 27.

For example, in the case of the cold weather in which the outside air temperature is maintained at 35 ° C. or higher, the refrigerant passes through the expansion tube N1 having a small expansion coefficient so that excessive evaporation does not occur in the evaporator 25, and further, superheated steam does not flow into the compressor. Improve cooling efficiency

As described above, even in the case of the cooling device using the heat pump system according to the present invention, when the outside air temperature is changed, the refrigerant flowing into the evaporator 25 may have optimal conditions by varying the expansion coefficient of the refrigerant according to the change of the outside air temperature. This can increase the performance of the heat pump system.

As described above, the heat pump system according to the present invention can form a system having a plurality of cycles simply by using a plurality of expansion tubes, so that the structure is simple, and the system can be operated at an optimal cycle according to the external temperature conditions. The efficiency can be maximized, and there is an advantage of preventing system failure due to overcooling or overheating of the refrigerant under extreme conditions.

Claims (2)

The evaporator 25, the compressor C, the condenser 23, the expander 26, and the refrigerant compressed by the compressor C may be supplied in the order of the evaporator 25, the expander 26, the condenser 23, or the condenser ( 23), in the heat pump system including the refrigerant direction control valve 22 for circulating in order of the expander 26, the evaporator 25, The expander 26 has a different expansion coefficient, each composed of a plurality of expansion tubes (N1-Nn) connected in parallel between the condenser 23 and the evaporator 25 to form a plurality of parallel cycle, Compares the outside temperature sensor (So) to detect and the outside temperature detected by the outside temperature sensor (So) with the temperature range set in various ranges to determine the temperature range to which the outside temperature belongs and expands corresponding to the temperature range And a controller (27) for controlling the electronically controlled directional valve (24) such that an expansion tube (N1-Nn) having a coefficient is selectively connected between the condenser (23) and the evaporator (25). Heat pump system having a plurality of cycles. (delete)

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