KR200284796Y1 - Defrost system - Google Patents

Abstract

The present invention relates to a refrigeration system (heat pump, refrigeration unit and refrigeration unit, etc.), the purpose of the defrosting device to prevent the performance degradation caused by the buildup of the outdoor unit coil surface when the outside air temperature decreases in winter, the refrigeration system stably By operating, it is possible to get the best performance by improving performance and saving power.

Description

Defrosting device {DEFROST SYSTEM}

The present invention is a defrosting device for obtaining a high temperature heat source (hot water, etc.) without degrading the performance of a heat pump by effective defrosting operation during the temperature dropping of the outdoor unit (evaporator) heat exchanger surface when the outdoor air temperature decreases in winter. It relates to a refrigeration system (heat pump, refrigeration unit and refrigeration unit, etc.) that is composed of a pass valve, a control valve, etc. to continuously supply a cooling heat source and a heat source, and in particular, to reduce the power of the compressor even when the outside temperature drops. It is designed to drive optimally.

In general, a refrigerant circulation cycle of a refrigeration system includes a compressor for compressing a refrigerant gas at a high temperature and high pressure to a condensation pressure, and a refrigerant compressed in the compressor using coolant (air, not water, in the case of air cooling and used by other coolants or devices). A condenser condensed into the liquid phase by heat dissipation by means of water), an expansion valve for expanding the liquid refrigerant in the high temperature and high pressure state condensed in the condenser into a low-pressure gas phase refrigerant by throttling, and an expansion spit While the expanded refrigerant is evaporated, the air blown by a blower (e.g., there are many types of evaporators depending on the type and structure of liquid, milk, and other refrigerating devices depending on the object to be cooled, but here is air for explanation). The evaporator cools by heat exchange and returns refrigerant gas to the compressor. Eojinda.

This refrigeration system is a system in which the refrigerant continuously changes state from gas to liquid and liquid to gas during the refrigerant circulation cycle, and the heating and cooling operation is switched to all directions. The heat pumps are a heat source as a heating heat source. Hot water, etc.) system.

In addition, in the conventional refrigeration system, when the outside air temperature decreases during the winter, frost occurs on the surface of the outdoor unit heat exchanger, and the heat exchange efficiency is lowered. Compression decreases due to the increase, and excessive discharge temperature rises, causing the compressor to burn out. In addition, the defrosting operation is not performed effectively, there is a disadvantage that the inefficient operation is achieved because the ratio of the defrosting time to the operating time increases.

The present invention prevents the deterioration of the refrigeration system by effective defrosting operation during the temperature drop (frost) on the surface of the outdoor unit (evaporator) heat exchanger when the outside air temperature decreases in winter, and stabilizes the refrigeration system (heat pump, refrigeration unit and refrigeration unit, etc.). It maintains the normal operation, and the compressor inlet specific volume is increased by lowering the evaporation pressure due to dropping, preventing the lowering of the freezing capacity and the rising of the discharge temperature, and preventing the damage of the compressor by suction of the compressor at the time of defrosting. To prevent the accumulation of heat in the cooling system to provide the best refrigeration system (heat pump, refrigeration unit and refrigeration unit, etc.).

1 is a view showing a defrost system diagram of a heat pump system according to the present invention.

Explanation of symbols on the main parts of the drawings

1-compressor 2-condenser

3-Evaporator 4-Expansion Valve

5-Four sides 10-Hot gas control valve

11-control valve

Refrigeration system (heat pump, refrigeration unit and refrigeration unit, etc.) according to the present invention for achieving the above object, the compressor for compressing the refrigerant gas in a state of high temperature and high pressure discharge; A condenser condensing the refrigerant compressed by the compressor into the liquid phase; An expansion valve for expanding the liquid refrigerant in a high temperature and high pressure state condensed in the condenser into a liquid refrigerant in a low pressure state; A receiver installed between the condenser and the expansion valve to supply only the liquid refrigerant to the expansion valve; An evaporator which evaporates each of the refrigerants expanded by the expansion valve while evaporating while achieving a freezing effect by heat exchange with the object to be cooled using the latent heat of evaporation of the refrigerant; It characterized in that it comprises a defrost means for branching the hot gas in the discharge line of the compressor to control a constant hot gas control valve to supply a high-temperature, high-pressure refrigerant vapor to the evaporator without passing through the condenser to perform defrost.

The evaporator is characterized in that to evaporate the refrigerant liquid to steam by direct heat exchange with the outside air.

The defrosting means is provided with control valves respectively at the inlet end of the condenser and the inlet end of the expansion valve, and installs a hot gas bypass pipe between the rear end of the expansion valve and the inlet end of the evaporator at the outlet end of the compressor. By installing a gas control valve is characterized in that the defrost by the selective opening and closing according to the control signal.

Features and advantages of the present invention will become more apparent from the detailed description of the preferred embodiments based on the accompanying drawings. Prior to this, the terms or words used in this specification and claims should not be construed as being limited to their usual or dictionary meanings, and the inventors will properly interpret the concept of terms in order to best explain their own design. Based on the principle that it can be defined, it should be interpreted as meaning and concept corresponding to the technical idea of the present invention.

The refrigeration system (heat pump, refrigeration unit, refrigeration unit, etc.) according to the present invention will be described by the accompanying drawings.

First, it is a compressor (reference numeral 1) that sucks refrigerant gas and compresses it at high temperature and high pressure and discharges it, and various forms such as reciprocating type, crank type, swash plate type, wobble plate type, rotary type, and scroll type depending on the purpose of use thereof. Compressor can be applied.

The discharge line of the compressor (1) is connected to the condenser (2) through the four sides (5), the condenser (2) is a liquid refrigerant of high temperature and high pressure by radiating the refrigerant gas discharged from the compressor (1) To condense Although not shown in detail here, the condenser 2 may be applied in the form of a plate heat exchanger, a cell-and-tube and a tube-in tube.

Therefore, the heat medium is circulated into the condenser 2, and in this process, the refrigerant flowing in the condenser 2 is deprived of heat to the heat medium to perform the condensation of the refrigerant. On the other hand, the inlet end side of the compressor (1) by evaporating the refrigerant flowing from the expansion valve (4) to be described later by using the latent heat of evaporation at this time evaporator (3) to achieve a freezing effect by heat-exchanging the object to be cooled and the refrigerant Is connected, and between the evaporator 3 and the compressor 1, a liquid separator for separating liquid refrigerant contained in the refrigerant gas discharged from the evaporator 3 and returning only the refrigerant gas to the compressor 1 is further installed. do.

In addition, an expansion valve 4 for supplying the liquid refrigerant in the high temperature and high pressure state supplied to the evaporator 3 so as to easily evaporate by expanding the liquid refrigerant in the high temperature and high pressure state supplied by the throttling action at the inlet end side of the evaporator 3. Is installed. Although not shown in detail, the first expansion valve (4) is an internal pressure equalization type and capillary which controls the opening degree of the high-pressure refrigerant passage through the pressure transfer rod by the expansion displacement of the diaphragm according to the temperature inside the temperature reduction chamber. Various types of thermostatic expansion valves, such as TEV and electronics, can be used, such as external pressure equalization, which controls the opening degree of the high-pressure refrigerant flow path by expansion displacement of the diaphragm through the tube.

The inlet end side of the expansion valve 4 is provided with a receiver 6 for supplying only the liquid refrigerant to the expansion valve 4. The receiver 6 temporarily stores the refrigerant in response to the load variation of the refrigerating cycle and separates the uncondensed refrigerant or the non-condensed gas contained in the liquid refrigerant.

According to the present invention, the evaporator 3 cools the air by evaporating the refrigerant liquid of the evaporator 3 from the liquid phase to vapor by direct heat exchange between the air of the outside air and the refrigerant liquid.

In addition, in order to defrost the evaporator 3, the present invention can be configured as shown in FIG.

First, according to FIG. 1, a hot gas valve 10 is installed in a pipe branched in parallel with a condenser in a discharge line of the first compressor 1 and controlled by the hot gas valve 10. The defrosting operation is periodically performed by hot gas of high temperature and high pressure which does not go through the condenser 2 by the hot gas control valve 10, and the operation of the hot gas valve 10 is performed by the temperature sensor 21 of the evaporator outlet. It is operated by the pressure sensor 20, the outside temperature sensor 22 and the periodic signal.

The defrosting according to FIG. 1 opens the control valve 11 provided on the inlet end side of the condenser 2, and opens the control valve 12 provided between the receiver 5 and the expansion valve 4, and hot. Operate for a certain time with the gas control valve 10 closed to remove the liquid refrigerant and the refrigerant oil inside the evaporator 3 to store the refrigerant liquid in the condenser 2 and the receiver 6, and the refrigerant oil to the compressor. Pump down operation to recover and store.

In this state, when the control valves 11 and 12 are closed and the hot gas control valve 10 is opened for a predetermined time, hot gas is introduced into the evaporator 3 (outdoor unit) to quickly complete defrosting.

When the defrosting is completed as described above, the control valves 11 and 12 are opened and the hot gas control valve 10 is normally operated in a closed state. The operation for the defrosting is performed by the operation of the hot gas control valve 10. Is operated by the temperature sensor 21, pressure sensor 20, ambient temperature sensor 22 and periodic signals at the evaporator outlet.

The control valve 11 may be used as a check valve and a solenoid valve.

As is apparent from the above description, the present invention is a refrigeration system (heat pump, refrigeration unit, refrigeration unit, etc.) is heated by effective defrosting operation during the temperature drop (frost) of the outdoor unit (evaporator) heat exchanger surface in the winter when the outside air temperature decreases. Prevents deterioration of the pump, maintains stable operation of the refrigeration system, and prevents a decrease in freezing capacity and heating capacity by increasing the compressor inlet specific volume due to the drop in evaporation pressure due to dropping, and the compressor discharge temperature due to the drop in evaporation pressure. It prevents the rise, prevents damage to the compressor by suction of the compressor of the liquid during defrosting, and has the effect of preventing accumulation in the evaporator of the refrigeration oil.

Claims (4)

In refrigeration systems (heat pump systems, refrigeration units and refrigeration units, etc.), A compressor for compressing and discharging the refrigerant gas to a state of high temperature and high pressure; A condenser condensing the refrigerant compressed by the compressor into the liquid phase; An expansion valve for expanding the liquid refrigerant in a high temperature and high pressure state condensed in the condenser into a liquid refrigerant in a low pressure state; A condenser and an expansion valve installed to supply a liquid refrigerant to an expansion valve; An evaporator for evaporating the refrigerant expanded in the two expansion valves and evaporating the refrigerant gas in a low-temperature low-pressure gas phase to the compressor by achieving evaporation effect by heat exchange with the object to be cooled using the latent heat of evaporation of the refrigerant; And defrosting means for branching the hot gas from the discharge line of the compressor to control the hot gas control valve and the control valve according to a control signal to supply the high temperature and high pressure refrigerant vapor to the evaporator without passing through the condenser to perform defrosting. Refrigeration system. According to claim 1, wherein the defrosting means is provided with a control valve between the inlet end of the condenser, the outlet of the receiver and the front of the expansion valve, respectively, and the bypass pipe is installed so as to connect between the expansion valve and the evaporator at the compressor discharge side. Defrosting system characterized in that the pass pipe is provided with a hot gas control valve to defrost the control valve by selectively opening and closing. The defrost system according to claim 2, wherein the control valve at the condenser inlet is used as a check valve. The system of claim 2 wherein the control valve at the condenser inlet is omitted.