WO2018147675A1

WO2018147675A1 - Refrigeration system

Info

Publication number: WO2018147675A1
Application number: PCT/KR2018/001748
Authority: WO
Inventors: 장판홍; 장군
Original assignee: 장판홍; 장군
Priority date: 2017-02-09
Filing date: 2018-02-09
Publication date: 2018-08-16
Also published as: KR101802107B1; CN110234944A; CN110234944B

Abstract

The present invention relates to a refrigeration system and, more particularly, to a refrigeration system which is installed in a box truck refrigerator, an industrial refrigerator, an air conditioner, various refrigeration systems, etc. and is capable of appropriately maintaining a refrigerant temperature by controlling a cooling state of a condensed gas according to a seasonal change or an abnormal high temperature change of an ambient temperature. The refrigeration system according to the present invention comprises: a suction pressure regulating valve which is installed in a first refrigerant pipe connected between an evaporator and a compressor and maintains a suction pressure at a predetermined pressure to prevent an overload of the compressor; a condensed gas detection unit, installed between the compressor and an expansion valve, for detecting a change in the cooling state of the condensed gas; and a solenoid valve installed in a bypass tube connected in parallel to one side of the first refrigerant pipe and controlling a suction amount of a refrigerant supplied from the evaporator to the compressor according to a detection signal of the condensed gas detection unit.

Description

Refrigeration system

The present invention relates to a refrigeration system, and more particularly, it is installed in a tower car refrigerator, an industrial refrigerator, an air conditioner, and various cooling systems, and adjusts a cooling state of a condensation gas according to a seasonal change or an abnormal high temperature change of an outside temperature. It relates to a refrigeration system that can be maintained properly.

Generally, a refrigeration system includes a compressor that circulates a refrigerant, a condenser that condenses compressed high temperature refrigerant, an expansion valve that expands the condensed high temperature and high pressure refrigerant to low temperature and low pressure, and vaporizes the low temperature and low pressure expanded refrigerant to cool the surrounding air. It consists of an evaporator, etc., and is applied to a vehicle refrigerator, an air conditioner, and various coolers.

In the refrigerating system, a receiver is installed between the condenser and the expansion valve to supply only the liquid refrigerant to the expansion valve, and the pure liquid refrigerant is supplied to the expansion valve to rapidly supply pressure to the evaporator.

In addition, if the refrigerant that is not completely evaporated in the evaporator at the same time sucked into the compressor, the compressor compresses the incompressible refrigerant liquid there is a risk of damage. In order to prevent such an accident in advance, a liquid separator is provided for separating the refrigerant liquid contained in the refrigerant gas sucked into the compressor.

However, in the conventional refrigeration system as described above, when the evaporation pressure or the condensation pressure rises, the rapid refrigeration performance decreases and the driving power of the compressor increases, causing the compressor to burn out, and expanding the non-condensable gas due to the decrease in the condensation capacity when the outside air temperature rises during the summer. In order to reduce the refrigerating capacity, there is a problem in that the energy flow rate of the refrigerant is not operated at an optimum state, and thus high energy loss occurs due to a decrease in the refrigerating capacity of the evaporator and an increase in the compression pressure of the compressor.

As an example of a technique for solving such a problem, a cooling system of Korean Utility Model Publication No. 20-0471061 is disclosed.

The cooling system includes a compressor for compressing the refrigerant, a condenser for condensing the refrigerant compressed by the compressor, an expansion valve for expanding the refrigerant condensed by the condenser, and an evaporator for evaporating the refrigerant expanded by the expansion valve; And a refrigerant inlet pipe connected between the compressor and the evaporator to prevent the compressor from being overloaded due to the refrigerant supplied from the evaporator to the compressor having a pressure below a predetermined pressure, and supplying a refrigerant having a lower amount than the compressor's compression capacity. A suction pressure regulating valve in which a refrigerant supply amount is set; An unloading bypass tube configured in parallel with the suction pressure control valve in the refrigerant inlet pipe and having a refrigerant supply amount corresponding to a difference between the refrigerant supply amount corresponding to the compression capacity of the compressor and the refrigerant supply amount of the suction pressure control valve; And an opening / closing valve for opening and closing the bypass pipe, wherein the bypass pipe is closed through the opening / closing valve when the compressor is initially started or restarted, and the refrigerant having a lower amount than the compression capacity of the compressor is provided only through the suction pressure control valve. Is supplied so that unloading can be started, and when the compressor is normally started after a certain time, the bypass pipe is opened through the on / off valve to correspond to the compression capacity of the compressor through the suction pressure regulating valve and the bypass pipe. And an unloading unit configured to allow a coolant to be supplied to the pump, and the suction pressure control valve is configured to supply a coolant reduced to 40% to 80% with respect to the coolant supply amount corresponding to the compression capacity of the compressor. The bypass pipe, the refrigerant is reduced to 60% to 20% of the refrigerant supply amount corresponding to the compression capacity of the compressor to the compressor Such that class is characterized in that a diameter.

However, the conventional technology configured as described above has installed a suction pressure regulating valve to solve this problem because the compressor consumes a lot of electricity at initial start or restart and causes a large amount of initial compression. There is a problem that takes a lot, there is a problem that the condenser overheating due to the poor cooling of the condensation gas due to the seasonal change or the abnormal high temperature change of the outside temperature.

In addition, the suction pressure control valve of the prior art is fixed at a constant pressure irrespective of the season, the on-off valve is opened and closed at the start or restart of the refrigerator and then closed after a certain time. Therefore, the suction pressure regulating valve is always open regardless of the season, the on-off valve is also composed of a system that is closed after a certain time after the operation regardless of the season.

In addition, the condensation state is changed according to the ambient temperature, a lot of cases of refrigerant condensation failure occurs, if the condensation state is poor there is a problem that the non-condensing gas is not completely condensed on the outlet side of the condenser is supplied to the expansion valve side.

An object of the present invention is to solve the problems described above, the solenoid valve installed in the bypass pipe of the low pressure by detecting the pressure and temperature between the compressor and expansion valve by the condensation gas pressure switch or condensation gas temperature sensor By controlling the opening and closing of the, to provide a refrigeration system that can greatly improve the freezing efficiency according to the freezing capacity.

In addition, it is installed in industrial refrigerators and various air-conditioning systems to provide a refrigeration system that can prevent the occurrence of fire and explosion accident due to overheating of the condenser due to seasonal change or abnormal high temperature of the outside temperature or cooling of the condensate gas when the vehicle is stopped. will be.

In addition, it is to provide a refrigeration system that can be easily installed in the existing air conditioning system or a freezer.

In addition, by improving the condensation efficiency to minimize the reduction of the refrigeration capacity of the expansion valve due to non-condensable gas, and provides a refrigeration system that can significantly improve the freezing effect by properly adjusting the condensation capacity according to the season and the surrounding environment. It is.

In order to achieve the above object, a refrigeration system according to the present invention includes a compressor for compressing a refrigerant, a condenser for condensing the refrigerant compressed by the compressor, a receiver for temporarily storing the refrigerant liquid liquefied in the condenser, and the condensed high temperature. A refrigeration system comprising an expansion valve for expanding a high pressure refrigerant liquid into a low temperature low pressure refrigerant gas and an evaporator for evaporating the refrigerant expanded by the expansion valve, the refrigeration system being installed in a first refrigerant pipe connected between the evaporator and the compressor. A suction pressure regulating valve for maintaining a suction pressure at a constant pressure to prevent an overload of the compressor; A condensation gas detector installed between the compressor and the expansion valve to detect a change in the cooling state of the condensation gas; And a solenoid valve installed in a bypass pipe connected to one side of the first refrigerant pipe in parallel, and controlling an intake amount of the refrigerant supplied from the evaporator to the compressor according to a detection signal of the condensation gas detector. .

In addition, a condensation gas temperature sensor is installed between the condenser and the inlet of the expansion valve to sense the temperature of the condensation gas to control the opening and closing of the solenoid valve; It is installed between the compressor and the inlet of the expansion valve characterized in that it comprises a condensation gas pressure switch for controlling the opening and closing of the solenoid valve by measuring the pressure of the condensation gas.

In addition, one side of the second refrigerant pipe connected between the compressor and the condenser, the high-pressure cut-off switch is operated when the pressure of the refrigerant flowing into the condenser from the compressor is higher than a predetermined pressure is installed to stop the operation of the compressor is installed. It is done.

In addition, a second bypass pipe for bypassing the refrigerant liquid discharged from the receiver is connected to one side of the third refrigerant pipe in which the expansion valve is installed, and to the one side of the second bypass pipe 101. A second solenoid valve is automatically installed according to a temperature to open and close the second bypass pipe, and a bypass expansion valve is installed to control an amount of refrigerant liquid introduced into the second bypass pipe. do.

In addition, one side of the condenser has an ambient temperature switch for controlling the opening and closing of the solenoid valve by sensing the ambient temperature of the condenser; Cooling water temperature switch for controlling the opening and closing of the solenoid valve by detecting the temperature of the cooling water discharged to the outlet side of the condenser characterized in that it is installed.

As described above, the refrigeration system according to the present invention, by adjusting the suction pressure of the compressor in accordance with the change in the condensing pressure of the condenser to supply a pure liquid refrigerant to the expansion valve has the effect of greatly improving the refrigerating capacity and refrigeration efficiency. .

In addition, it is installed in industrial refrigerators and various air-conditioning systems to prevent fire and explosion accidents due to condenser overheating due to seasonal change or abnormal high temperature of outside temperature or cooling of condensate gas when the vehicle is stopped. It is possible to reduce the occurrence of overheating temperature and to control the condensation temperature according to the change of temperature, thereby deviating from the effects of atmospheric temperature, air pollution and steam of steam.

In addition, it is possible to install a simple change to the existing air conditioning system or a freezer to handle easily, improve the condensation efficiency has the effect of minimizing the reduction of the refrigeration capacity of the expansion valve by non-condensable gas.

1 is a block diagram showing a refrigeration system according to the present invention.

2 is a view showing the flow of the refrigerant by the condensation gas pressure switch of the refrigeration system according to the present invention.

3 is a view showing the flow of the refrigerant by the condensation gas temperature sensor of the refrigeration system according to the present invention.

Figure 4 is a block diagram showing another embodiment of the refrigeration system according to the present invention.

Figure 5 is a block diagram showing another embodiment of the refrigeration system according to the present invention.

Figure 6 is a block diagram showing another embodiment of the refrigeration system according to the present invention.

Figure 7 is a block diagram showing another embodiment of the refrigeration system according to the present invention.

10 compressor 20 condenser

21: ambient temperature switch 22: coolant temperature switch

30: receiver 31: condensation gas detector

311: condensing gas temperature sensor 312: condensing gas pressure switch

40 expansion valve 50 evaporator

60: first refrigerant pipe 61: suction pressure control valve

70: bypass tube 71: solenoid valve

80: second refrigerant piping 81: high-pressure cut off switch

90: equalization piping 91: valve

100: third refrigerant pipe 101: second bypass pipe

102: second solenoid valve 103: bypass expansion valve

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

As shown in FIG. 1, the refrigeration system according to the present invention includes a compressor 10 compressing a refrigerant, a condenser 20 condensing the refrigerant compressed by the compressor 10, and liquefied in the condenser 20. A receiver 30 for temporarily storing a refrigerant liquid, an expansion valve 40 for expanding the condensed high temperature and high pressure refrigerant liquid into a low temperature low pressure refrigerant gas, and an evaporator for evaporating the refrigerant expanded by the expansion valve 40. And 50.

The compressor 10 compresses the low pressure gas circulated through the evaporator 50 in the compressor to be a high temperature and high pressure gas gas, and compresses the refrigerant sucked from the evaporator 50 to supply the condenser 20. do.

The condenser 20 discharges the high temperature and high pressure refrigerant discharged from the compressor 10 into air at room temperature to liquefy condensation to supply the expansion valve 40 through the receiver 30.

The expansion valve 40 expands the refrigerant condensed by the condenser 20 into a liquid refrigerant of low temperature and low pressure so as to be easily evaporated from the evaporator 50, and supplies the refrigerant to the evaporator 50.

The evaporator 50 evaporates the low-temperature low-pressure refrigerant expanded by the expansion valve 40 to absorb latent heat of evaporation from the surroundings to cool the fluid such as air and water.

On the other hand, the present invention is installed in industrial refrigerators and various air-conditioning system, the suction pressure regulating valve 61 to maintain the refrigerant temperature properly by adjusting the cooling state of the condensation gas according to the seasonal change or the abnormal high temperature change of the outside temperature, It further comprises a condensation gas detector 31 and the solenoid valve (71).

The suction pressure regulating valve (SPR) 61 is operated by the pressure at the valve outlet, and when the initial start-up, the evaporation load is increased larger than the normal value. When the suction pressure is above a predetermined pressure, the motor of the compressor 10 Since the motor may be damaged due to overload, it is used to protect the compressor 10 from overload by preventing the suction pressure from being higher than a predetermined value.

This, the suction pressure control valve 61 is installed in the first refrigerant pipe 60 connected between the evaporator 50 and the compressor 10, the suction pressure is a constant pressure to prevent overload of the compressor (10) It serves to maintain.

The condensation gas detector 31 is installed between the compressor 10 and the expansion valve 40 to detect a change in the cooling state of the condensation gas.

The condensation gas detector 31 is installed between the condenser 20 and the inlet of the expansion valve 40 to detect the temperature of the condensation gas to control the opening and closing of the solenoid valve 71 311. And a condensation gas pressure switch 312 installed between the compressor 10 and the inlet of the expansion valve 40 to control the opening and closing of the solenoid valve 71 by measuring the pressure of the condensation gas.

The condensation gas temperature sensor 311 is installed in the refrigerant pipe connected between the condenser 20 and the inlet of the expansion valve 40 to detect the temperature value of the condensation gas and outputs it to the solenoid valve 71.

In particular, the condensation gas temperature sensor 311 is composed of any one of a temperature switch or a temperature sensor, the control unit to control the opening and closing of the solenoid valve 71 by receiving a signal output from the temperature sensor when configured as a temperature sensor (Not shown) may be installed.

The condensation gas pressure switch 312 is installed in the refrigerant pipe connected between the compressor 10 and the inlet of the expansion valve 40 detects the pressure value of the condensation gas and outputs it to the solenoid valve 71.

Preferably, when the condensation gas temperature sensor 311 and the condensation gas pressure switch 312 is connected to the receiver 30, the temperature and pressure of the condensation gas can be detected most efficiently.

2 is a view showing the flow of the refrigerant by the condensation gas pressure switch of the refrigeration system according to the present invention, Figure 3 is a view showing the flow of the refrigerant by the condensation gas temperature sensor of the refrigeration system according to the present invention.

As shown in Figure 2a, when the condensation gas pressure is lowered below the set pressure by the fall of the outside air temperature in winter, the condensing gas pressure switch 312 detects this, the solenoid valve 71 is installed in the bypass pipe (70) Open).

As shown in FIG. 2B, when the condensation gas pressure rises above the set pressure due to an increase in the outside air temperature in summer, the condensing gas pressure switch 312 senses this and the solenoid valve 71 installed in the bypass pipe 70. ).

As shown in Figure 3a, when the cooling temperature is lowered below the set temperature by the fall of the outside air temperature in winter, the condensation gas temperature sensor 311 detects this, the solenoid valve 71 is installed in the bypass pipe (70) To open.

As shown in FIG. 3B, when the cooling temperature rises above the set temperature due to an increase in the outside air temperature in summer, the condensing gas temperature sensor 311 detects this and the solenoid valve 71 installed in the bypass pipe 70. To close.

As such, in the winter when the outdoor temperature is relatively low, the suction pressure of the compressor 10 is maximized to greatly improve the freezing effect according to the freezing capacity, and in the summer when the outdoor air temperature is relatively high, the suction pressure of the compressor 10 is constantly supplied. It is possible to flexibly correspond to the cooling temperature of the condenser 20 according to the change in the outside air temperature.

Therefore, the present invention may cause condenser overheating due to a poor cooling of the condensation gas due to seasonal change or abnormal high temperature change of the outside temperature, and the condensation state is often changed according to the outside temperature, and in particular, the condensation state is poor. In the condenser, the non-condensable gas is not completely condensed to the outlet side can solve the problem of inflow to the expansion valve side.

On the other hand, the solenoid valve 71 is installed in the bypass pipe 70 connected in parallel to one side of the first refrigerant pipe 60, the evaporator 50 in accordance with the detection signal of the condensation gas detector 31. ), The suction amount of the refrigerant supplied to the compressor 10 is interrupted.

That is, when the pressure and temperature of the condensation gas are high, the solenoid valve 71 closes the bypass pipe 70 by the control signal input from the condensation gas detecting unit 31 to the compressor 10. Only a suction pressure control valve 61 is supplied to the refrigerant of a lower amount than the compression capacity of the compressor 10, and when the pressure and temperature of the condensation gas is low, the control signal input from the condensation gas detection unit 31 By opening the bypass pipe 70 by the suction pressure control valve 61 and the bypass pipe 70 so that the amount of refrigerant corresponding to the compression capacity of the compressor 10 is supplied.

Figure 4 is a block diagram showing another embodiment of a refrigeration system according to the present invention.

As shown in FIG. 4, at one side of the second refrigerant pipe 80 connected between the compressor 10 and the condenser 20, the pressure of the refrigerant flowing into the condenser 20 from the compressor 10 is constant. When the pressure rises above the pressure, the high pressure cut-off switch 81 may be installed to stop the operation of the compressor 10.

The high-pressure cutoff switch 81 stops the operation when an abnormal pressure occurs in the second refrigerant pipe 80 during the operation and the high pressure rises or the discharge pressure of the compressor 10 rises rapidly.

That is, if the high pressure is too low, the refrigerant condensed and liquefied in the condenser 20 is too cooled, resulting in a decrease in the amount of refrigerant circulation in the device along with the fear of generating a gas that hinders the cooling effect of the evaporator 50.

In addition, if the high pressure is too high causes an overcurrent flows in the compressor motor coil, the amount of condensed refrigerant is reduced, resulting in a decrease in freezing capacity.

Therefore, in order to prevent the above problems in advance, it is necessary to maintain pressure so that the compressor 10 can be ideally operated by the high-pressure cut-off switch 81.

Figure 5 is a block diagram showing another embodiment of a refrigeration system according to the present invention.

As shown in FIG. 5, between the condenser 20 and the receiver 30, the valve 91 maintains a constant pressure between the compressor 10, the condenser 20, and the receiver 30. Equipped with a pressure equalizing pipe 90 may be further installed.

In the condenser 20, the pressure should be constant in the condensation process of the state of the refrigerant is changed from gas to liquid, the non-liquefied non-condensable gas is present in the receiver 30 may not be constant pressure.

In this case, only the liquefied liquid is stored in the receiver 30 by bypassing the non-condensable gas to the condenser 20 through the pressure equalizing pipe 90, and the non-condensed gas discharged to the condenser 20. Is liquefied again in the condenser 20.

In addition, by bypassing the non-condensable gas through the pressure equalizing pipe 90, the operation of the condensation gas detector 31 may be smoothed and the detection function may be improved.

Figure 6 is a block diagram showing another embodiment of a refrigeration system according to the present invention.

As shown in FIG. 6, at one side of the third refrigerant pipe 100 in which the expansion valve 40 is installed, a second bypass pipe 101 for bypassing the refrigerant liquid discharged from the receiver 30. ) May be connected.

In addition, one side of the second bypass pipe 101 is provided with a second solenoid valve 102 which is automatically operated according to the room temperature to open and close the second bypass pipe 101, and the second bypass Bypass expansion valve 103 for adjusting the amount of the refrigerant liquid introduced into the pipe 101 may be installed.

Such a system is preferably applied to an air conditioner for a vehicle, and is operated as follows when the flow of the condensation refrigerant is smooth due to a sufficient condensation effect while the vehicle is being driven or the condenser ambient temperature of spring and autumn is 30 degrees or less. do.

When the second solenoid valve 102 is operated according to the room temperature of the vehicle, the second bypass pipe 101 is opened to discharge a large amount of the low temperature refrigerant liquid discharged from the receiver 30 to the evaporator ( 50) can maximize the cooling effect.

Figure 7 is a block diagram showing another embodiment of a refrigeration system according to the present invention.

As shown in FIG. 7, one side of the condenser 20 includes an ambient temperature switch 21 for sensing the ambient temperature of the condenser 20 to control the opening and closing of the solenoid valve 71; Cooling water temperature switch 22 for controlling the opening and closing of the solenoid valve 71 by sensing the temperature of the cooling water discharged to the outlet side of the condenser 20 may be installed.

The ambient temperature switch 21 is installed around the air-cooled condenser to sense the temperature around the condenser in the process of condensing the refrigerant, the cooling water temperature switch 22 is installed at the outlet or pipe of the water-cooled condenser to the temperature of the cooling water Will be detected.

For example, in the case of the air-cooled condenser, when the cooling temperature is lowered below the set temperature by the fall of the outside air temperature in winter, the ambient temperature switch 21 detects this and opens the solenoid valve 71.

In addition, when the cooling temperature rises above the set temperature due to the increase in the outside air temperature in the summer, the ambient temperature switch 21 detects this to close the solenoid valve 71.

On the other hand, in the case of the water-cooled condenser when the coolant temperature is lowered below the set temperature by the fall of the outside air temperature in winter, the coolant temperature switch 22 detects this to open the solenoid valve 71.

In addition, when the coolant temperature rises above the set temperature due to an increase in the outside air temperature in summer, the coolant temperature switch 22 detects this to close the solenoid valve 71.

As such, by automatically controlling the opening and closing of the solenoid valve 71 by the ambient temperature switch 21 and the cooling water temperature switch 22, the low pressure pressure of the compressor 10 is adjusted to condense the refrigerant gas of the condenser 20. It can maintain the proper and greatly improve the freezing capacity and freezing efficiency according to the condensation effect.

Although the present invention has been described with reference to the accompanying drawings, preferred embodiments of the present invention will be apparent to those skilled in the art that various modifications can be made without departing from the scope of the present invention. Therefore, the scope of the invention should be construed by the claims described to include examples of many such variations.

Claims

Compressor 10 for compressing the refrigerant, a condenser 20 for condensing the refrigerant compressed by the compressor 10, a receiver 30 for temporarily storing the refrigerant liquid liquefied in the condenser 20, the condensed A refrigeration system comprising an expansion valve (40) for expanding a high temperature and high pressure refrigerant liquid into a low temperature low pressure refrigerant gas and an evaporator (50) for evaporating the refrigerant expanded by the expansion valve (40),

A suction pressure regulating valve (61) installed in the first refrigerant pipe (60) connected between the evaporator (50) and the compressor (10) and maintaining the suction pressure at a constant pressure to prevent overload of the compressor (10);

A condensation gas detector 31 installed between the compressor 10 and the expansion valve 40 to detect a change in a cooling state of the condensation gas; And

It is installed in the bypass pipe 70 connected in parallel to one side of the first refrigerant pipe 60, and is supplied to the compressor 10 from the evaporator 50 in accordance with the detection signal of the condensation gas detector 31 A solenoid valve 71 which regulates the suction amount of the refrigerant;

Refrigeration system comprising a.
The method of claim 1,

The condensation gas detector 31,

A condensation gas temperature sensor 311 installed between the condenser 20 and the inlet of the expansion valve 40 to sense the temperature of the condensation gas to control the opening and closing of the solenoid valve 71;

A condensation gas pressure switch 312 installed between the compressor 10 and the inlet of the expansion valve 40 to control the opening and closing of the solenoid valve 71 by measuring the pressure of the condensation gas;

Refrigeration system comprising a.
The method of claim 1,

On one side of the second refrigerant pipe 80 connected between the compressor 10 and the condenser 20,

Refrigeration system, characterized in that the high-pressure cut-off switch (81) is installed to operate when the pressure of the refrigerant flowing from the compressor (10) to the condenser (20) is higher than a predetermined pressure to stop the operation of the compressor (10).
The method of claim 1,

On one side of the third refrigerant pipe 100, the expansion valve 40 is installed,

A second bypass pipe 101 for bypassing the refrigerant liquid discharged from the receiver 30 is connected,

On one side of the second bypass pipe 101,

A second solenoid valve 102 which is automatically operated according to room temperature and opens and closes the second bypass pipe 101 is installed, and adjusts the amount of refrigerant liquid introduced into the second bypass pipe 101. Refrigeration system, characterized in that the bypass expansion valve 103 is installed.
The method of claim 1,

On one side of the condenser 20,

An ambient temperature switch 21 for sensing the ambient temperature of the condenser 20 to control the opening and closing of the solenoid valve 71; Refrigeration system, characterized in that the cooling water temperature switch 22 for controlling the opening and closing of the solenoid valve 71 by sensing the temperature of the cooling water discharged to the outlet side of the condenser (20).