TWI583905B - Freezing system and its pressure balance control device - Google Patents

Description

Refrigeration system and its pressure balance control device

The present invention relates to a refrigeration system and a control device therefor, and more particularly to a refrigeration system and a pressure balance control device for maintaining a constant temperature of a mechanical device through a circulating fluid.

The existing refrigeration system utilizes a compressor for compressing a low-temperature low-pressure gaseous refrigerant into a high-temperature high-pressure gaseous refrigerant, and a condenser to cool the high-temperature high-pressure gaseous refrigerant into a low-temperature high-pressure liquid refrigerant, and a refrigerant controller to lower the temperature. The high-pressure liquid refrigerant generates a pressure reducing effect and continues to be transported toward an evaporator, which vaporizes the received liquid refrigerant into a low-temperature low-pressure gaseous refrigerant, such that the vaporization of the liquid refrigerant absorbs heat to cause, for example, an indoor ambient temperature. Reduce and achieve the cooling effect. Then, the low-temperature low-pressure gaseous refrigerant is again returned to the compressor and the process is repeated to form a closed refrigeration cycle, which is repeated to achieve the purpose of cooling. However, the heat absorbed by the evaporator and the residual heat generated by the operation of the compressor may return to the refrigeration cycle, which may cause poor heat dissipation of the condenser, thereby causing the pressure on the high pressure side of the compressor to be too high, and may cause the compression. The machine is overloaded and the power trips, interrupting the operation of the refrigeration system.

Accordingly, it is an object of the present invention to provide a refrigeration system that can control the pressure balance of the system and avoid overloading the compressor.

Still another object of the present invention is to provide a pressure balance control device for mounting to the refrigeration system.

Thus, the present invention has a pressure automatic balancing function refrigeration system comprising a condensing unit, a first refrigerant conveying line, and a pressure balance control device.

The condensing unit is used to provide a refrigerant in a liquid state.

The first refrigerant delivery line is configured to receive the refrigerant of the condensing unit and deliver the refrigerant to an evaporator for liquid to gas conversion at the evaporator.

The pressure balance control device includes a temperature control unit, a first refrigerant control valve, and a refrigerant supply switching controller.

The temperature control unit is configured to determine whether the temperature of the evaporator is abnormal and generate a temperature adjustment trigger signal, and the temperature adjustment trigger signal is converted at a temperature adjustment level and a non-temperature adjustment level.

The first refrigerant control valve is disposed in the first refrigerant delivery line, and determines whether to transfer the refrigerant from the condensing unit to the first refrigerant delivery line according to whether a valve opening signal is received.

The refrigerant supply switching controller is electrically connected to the temperature control unit and the first refrigerant control valve to receive a temperature adjustment trigger signal from the temperature control unit, and determines whether to output the valve according to the level of the temperature adjustment trigger signal. The signal is turned on to the first refrigerant control valve.

The effect of the present invention is that when the temperature control unit determines that the temperature of the evaporator is abnormal and the temperature adjustment trigger signal received by the refrigerant supply switching controller is at the temperature adjustment level, the refrigerant supply switching controller does not output the valve. The signal is turned on to the first refrigerant control valve such that the first refrigerant control valve is closed, and the refrigerant from the condensing unit is blocked from being delivered to the first refrigerant delivery line.

Before the present invention is described in detail, it should be noted that in the following description, similar elements are denoted by the same reference numerals.

Referring to Figure 1, a first embodiment of a refrigeration system having a pressure equalization function includes a condensing unit 1, an evaporator 2, a first refrigerant delivery line 21, and a pressure balance control unit 3.

The condensing unit 1 is configured to provide a refrigerant in a liquid state and includes a compressor 11, a condenser 12, and a refrigerant controller 13. The compressor 11 is configured to compress and output the refrigerant into a high temperature and high pressure gas, and the condenser 12 dissipates the high temperature and high pressure gaseous refrigerant into a low temperature and high pressure liquid refrigerant, and the liquid refrigerant continues to be transported toward the refrigerant controller 13 . The refrigerant controller 13 has an effect of generating a pressure reduction, and the low-temperature high-pressure liquid refrigerant is supplied as a low-temperature low-pressure liquid refrigerant. The refrigerant controller 13 may be a capillary tube, an automatic expansion valve, an electronic expansion valve, or the like.

The first refrigerant delivery line 21 is configured to receive the refrigerant of the condensing unit 1 and deliver the refrigerant to the evaporator 2 to perform liquid to gas conversion at the evaporator 2. The first refrigerant feed line 21 is connected between the refrigerant controller 13 and the evaporator 2 to receive the liquid refrigerant decompressed from the refrigerant controller 13 and deliver the liquid refrigerant to the evaporator 2. The low-temperature low-pressure refrigerant liquid is refluxed to the compressor 11 of the condensing unit 1 after the evaporator 2 evaporates and absorbs heat.

The pressure balance control device 3 includes a first refrigerant control valve 31, a temperature control unit 32, and a refrigerant supply switching controller 33.

The first refrigerant control valve 31 is disposed on the first refrigerant delivery line 21 between the refrigerant controller 13 of the condensing unit 1 and the evaporator 2, and determines whether to make a response based on whether a valve opening signal is received. The refrigerant of the refrigerant controller 13 is sent to the first refrigerant delivery line 21. When the first refrigerant control valve 31 receives the valve opening signal, the refrigerant is delivered to the first refrigerant delivery line 21; otherwise, if the valve opening signal is not received, the refrigerant from the refrigerant controller 13 is blocked. The refrigerant is delivered to the first refrigerant delivery line 21.

The temperature control unit 32 generates the valve opening signal, and the temperature control unit 32 is further configured to determine whether the temperature of the evaporator 2 is abnormal, to generate a temperature adjustment trigger signal, and the temperature adjustment trigger signal is at a temperature adjustment level. And a non-tempering level change.

Specifically, the temperature control unit 32 includes a temperature detector 321, a temperature controller 322, an electric heater 323, and a thermal switch 324. The temperature detector 321 is coupled to the evaporator 2 and is configured to detect the temperature of the evaporator 2. The temperature controller 322, for example, a PID controller, generates the valve opening signal and a thermal energy control signal according to the temperature of the evaporator 2 and a set temperature of a desired evaporator of the user. The electric heater 323 provides or interrupts the electric heating energy to the evaporator 2 according to the level of the temperature regulation trigger signal. When the temperature adjustment trigger signal is at the temperature adjustment level, the electric heater 323 provides electric heating energy. The trigger level is at the non-tempering level, and the electric heater 323 interrupts the supply of electrothermal energy. The thermal switch 324 is, for example, a solid state relay (SSR) electrically connected to the temperature controller 322 and the electric heater 323, and generates the temperature adjustment trigger signal according to the control of the thermal energy control signal of the temperature controller 322. One of the temperature regulation level and the non-temperature regulation level. The temperature control level is, for example, logic 1, that is, the thermal switch 324 is turned on, and the non-temperature regulation level is, for example, logic 0, that is, the thermal switch 324 is not turned on, that is, the thermal switch 324 is based on The control of the thermal energy control signal of the temperature controller 322 is operated in one of conduction and non-conduction, and correspondingly generates one of the temperature regulation level and the non-temperature regulation level, so that the electric heater 324 is correspondingly provided. Or interrupt the electric heating energy to the evaporator 2.

Referring to FIG. 1 and FIG. 2, the refrigerant supply switching controller 33 is electrically connected to the temperature control unit 32 and the first refrigerant control valve 31 to receive a temperature adjustment trigger signal from the temperature control unit 32, and according to the adjustment The level of the temperature trigger signal determines whether to output the valve open signal to the first refrigerant control valve 31. In this embodiment, the refrigerant supply switching controller 33 includes a first switch 34, and the first switch 34 is, for example, a relay switch, and has a first contact 341 and a second connection. A point 342, a third contact 343, a control contact 344, a fourth contact 345, a power contact 347, and a power contact 348. The first contact 341 is electrically connected to the N-phase end of the first refrigerant control valve 31 and is used to output the valve opening signal. The second contact 342 is electrically connected to the temperature controller 322 of the temperature control unit 32 to receive the valve opening signal from the temperature controller 322. The third contact 343 is floating. The fourth contact 345 is electrically connected to the L-phase end of the first refrigerant control valve 31. The power contact 347 is electrically connected to the L-phase power supply. The power contact 348 is electrically connected to the L phase power supply. The control node 344 is electrically connected to the thermal switch 324 of the temperature control unit 32 to receive the temperature adjustment trigger signal, and selectively establishes the second contact 342 according to the level of the temperature adjustment trigger signal. One of the contact 341 and the third contact 343 is electrically connected, and the valve opening signal is transmitted to the first contact 341 and the third contact 343 via the second contact 342. By.

The specific technology for achieving the pressure balance of the refrigeration system of the present invention is: when the temperature controller 322 of the temperature control unit 32 determines that the temperature of the evaporator 2 is abnormal, and the control contact of the first changeover switch 34 of the refrigerant supply switching controller 33 The temperature adjustment trigger signal received by the 344 is at the temperature adjustment level, and the first switch 34 establishes an electrical connection between the second contact 342 and the third contact 343, and thus the second contact The valve opening signal received by 342 is not output to the first refrigerant control valve 31, so that the first refrigerant control valve 31 is closed, and the refrigerant from the condensing unit 1 is blocked from being delivered to the first refrigerant delivery line 21. .

More specifically, for example, the temperature controller 322 determines that the temperature of the evaporator 2 is lower than the temperature set by the user according to the temperature detected by the temperature detector 321 to generate the thermal energy control signal. The temperature control trigger signal of the thermal switch 324 is controlled to be at the temperature adjustment level, and the electric heater 323 receives the temperature adjustment trigger signal of the temperature adjustment level to provide electrothermal energy to the evaporator 2, and at the same time, the first A refrigerant control valve 31 blocks the delivery of the refrigerant to the first refrigerant delivery line 21, so that the first refrigerant delivery line 21 does not transport when the evaporator 2 receives the heating energy to raise the temperature to the set temperature. The refrigerant, therefore, the evaporator 2 does not receive the electric heating energy and the receiving refrigerant at the same time, and avoids receiving the refrigerant to evaporate when the temperature rises, so that a large amount of residual heat can be prevented from returning to the refrigeration cycle, so that the condenser 12 is poorly dissipated, and the compressor is not caused. 11 The pressure on the high pressure side is too high, so that the pressure balance of the system can be controlled and the compressor 11 can be tripped without overloading. Similarly, for example, when the temperature controller 322 determines that the temperature of the evaporator 2 is higher than the set temperature, the temperature control trigger signal of the thermal switch 324 is controlled by the thermal energy control signal to be at the non-tempered level. The switch 34 establishes an electrical connection between the second contact 342 and the first contact 341, and the valve open signal of the temperature controller 322 is output to the first refrigerant control valve 31 via the first contact 341. Therefore, the first refrigerant control valve 31 is opened and the refrigerant is delivered, and the electric heater 323 interrupts the supply of the electric heating energy to the evaporator 2, thereby preventing the evaporator 2 from simultaneously receiving the refrigerant and receiving the electric heating energy for evaporation, so that the same can be achieved. Invented the purpose of pressure balance in refrigeration systems.

Referring to FIG. 3, a second embodiment of the refrigeration system of the present invention differs from the first embodiment in that the refrigeration system further includes a second refrigerant delivery line 22, and the pressure balance control device 3 further includes a first A refrigerant control valve 36 and a pressure control unit 37. And in the second embodiment, the refrigerant supply switching controller 33 further includes a second changeover switch 35.

The second refrigerant delivery line 22 is configured to receive a second flow of refrigerant from the refrigerant controller 13 of the condensing unit 1 and deliver the same to the evaporator 2 for liquid to gas conversion. The first refrigerant delivery line 21 Then, receiving a first flow of refrigerant, and the second flow is smaller than the first flow.

The second refrigerant control valve 36 is disposed in the second refrigerant delivery line 22 between the refrigerant controller 13 and the evaporator 2, and determines whether to make the refrigerant from the refrigerant controller 13 according to whether the valve opening signal is received. The refrigerant is delivered to the second refrigerant delivery line 22.

The pressure control unit 37 is electrically connected to the second changeover switch 35 of the refrigerant supply switching controller 33 for determining whether the system pressure of the condensing unit 1 is abnormal and accordingly generating a pressure trigger signal to the refrigerant supply switching controller 33. The second switch 35 is operated, and the pressure trigger signal is converted at an overvoltage level and a non-overvoltage level. In detail, the pressure control unit 37 includes a pressure detector 371 and a pressure control switch 372. The pressure detector 371 is mounted between the compressor 11 and the condenser 12, such as the node N shown in FIG. 3, to detect the refrigerant pressure and generate a pressure detection value. The pressure control switch 372 is electrically connected to the pressure detector 371 and the second switch 35 of the refrigerant supply switching controller 33, and determines the pressure trigger signal according to the pressure detection value of the pressure detector 371. Level. When the pressure detection value received by the voltage control switch 372 reaches an upper limit value, the voltage control switch 372 outputs the pressure trigger signal to the overvoltage level. When the pressure detection value received by the voltage control switch 372 reaches a lower limit value, the voltage control switch 372 outputs the pressure trigger signal to the non-overvoltage level. Wherein, the overvoltage level is logic 1, for example, the non-overvoltage level is, for example, logic 0, that is, the voltage control switch 372 reaches the upper limit value according to the pressure detection value, for example, 300 PSI, and reaches the lower limit. A value, for example, 200 PSI, operates in one of conduction and non-conduction, and correspondingly generates one of the overvoltage level and the non-overvoltage level.

Referring to FIG. 3 and FIG. 4, the first switch 34 of the refrigerant supply switching controller 33 has the first contact 341, the second contact 342, and the third connection as described in the first embodiment. Point 343, the control contact 344, and the fourth contact 345. The first contact 341 is electrically connected to the N-phase end of the first refrigerant control valve 31 and the N-phase end of the second refrigerant control valve 36. The second contact 342 is electrically connected to the temperature control of the temperature control unit 32. The device 322 receives the valve opening signal from the temperature controller 322, and the fourth contact 345 is configured to output the valve opening signal.

The second switch 35 of the refrigerant supply switching controller 33 has a fifth contact 351, a sixth contact 352, a seventh contact 353, a control contact 354, and a power contact 355. The fifth contact 351 is electrically connected to the fourth contact 345 of the first changeover switch 34 to receive the valve open signal. The sixth contact 352 is electrically connected to the L-phase end of the first refrigerant control valve 31, and when the electrical connection is established with the fifth contact 351, the valve opening signal is output to the first refrigerant control valve 31. The seventh contact 353 is electrically connected to the L-phase end of the second refrigerant control valve 36, and when the electrical connection is established with the fifth contact 351, the valve opening signal is output to the second refrigerant control valve 36. The power contact 355 is electrically connected to the L-phase power supply. The control contact 354 is electrically connected to the voltage control switch 372 of the pressure control unit 37, and selectively establishes the fifth contact 351 and the sixth contact 352 and the seventh connection according to the level of the pressure trigger signal. One of the points 353 is electrically connected, and the valve opening signal is transmitted to the sixth contact 352 and the seventh contact 353 via the fifth contact 351.

In the second embodiment, the pressure balance control device 3 of the refrigeration system is further used to control the pressure balance of the system. The specific technique is: when the pressure control unit 37 determines the condensing unit 1 (for example, the node shown in FIG. 3) The pressure of N) is abnormal and the pressure trigger signal received by the second changeover switch 35 of the refrigerant supply switching controller 33 is at the overpressure level, and the second changeover switch 35 of the refrigerant supply switching controller 33 does not output the valve. Turning on the signal to the first refrigerant control valve 31, and outputting the valve opening signal to the second refrigerant control valve 36, so that the second refrigerant control valve 36 is opened and the second flow of refrigerant is delivered to the second refrigerant delivery Line 22. In more detail, when the temperature adjustment trigger signal output by the thermal switch 324 is at the temperature adjustment level, the second contact 342 of the first switch 34 transmits the valve open signal to the first contact. 341 and the fourth contact 345 outputs the valve opening signal. At this time, for example, the pressure detector 371 detects that the pressure between the compressor 11 and the condenser 12 reaches the upper limit value (for example, 300 PSI). The pressure control switch 372 generates the pressure trigger signal at the overvoltage level and the control contact 354 of the second switch 35 receives the pressure trigger signal at the overvoltage level, and the second switch 35 establishes the The fifth contact 351 is electrically connected to the seventh contact 353, so that the second refrigerant control valve 36 receives the valve opening signal to open, and delivers the second flow of refrigerant to the second refrigerant delivery pipe. At the same time, the first refrigerant control valve 31 is closed because the valve opening signal is not received, thereby blocking the delivery of the refrigerant at the first flow rate, so that only the flow rate of the refrigerant having a small flow rate is allowed to be sent to the evaporation. 2, but can reduce the system The force is increased, and the evaporator 2 can be prevented from receiving a large amount of refrigerant at the same time and receiving electric heating energy for evaporation, so that a large amount of residual heat is not generated, thereby causing poor heat dissipation of the system, thereby simultaneously achieving the pressure balance of the system and causing the compressor 11 to be overloaded. machine. Similarly, for example, when the pressure detector 371 detects that the pressure between the compressor 11 and the condenser 12 reaches the lower limit value (for example, 200 PSI), the pressure control switch 372 generates the pressure trigger signal to the non- The overvoltage level and the control contact 354 of the second switch 35 receives the pressure trigger signal at a non-overvoltage level, and the second switch 35 establishes the fifth contact 351 and the sixth contact 352. Electrically connected such that the first refrigerant control valve 31 receives the valve opening signal and delivers the first flow of refrigerant to the first refrigerant delivery line 21, while the second refrigerant control valve 36 is not received The valve is closed by the opening signal, thereby blocking the delivery of the refrigerant at the second flow rate, thereby allowing the refrigerant having a larger flow rate to be delivered to the evaporator 2 via the first refrigerant control valve 31 and the first refrigerant delivery line 21, To achieve rapid cooling and improve the refrigeration load.

As apparent from the above description, the pressure balance control device 3 of the refrigeration system of the present invention can determine at the temperature controller 321 that the temperature of the evaporator 2 is too low (or too high), and the electric heater 323 supplies (or interrupts) the electric heat. The first refrigerant control valve 31 can be controlled by the switching operation of the first changeover switch 34 of the refrigerant supply switching controller 33 when the evaporator 2 is heated (or lowered) to the set temperature desired by the user. Closing (or opening), and correspondingly blocking (or opening) the refrigerant delivery to prevent the evaporator 2 from simultaneously receiving the refrigerant and the electrothermal energy for evaporation. In addition, the second refrigerant delivery line 22 for transporting a small amount of refrigerant and the corresponding second refrigerant control valve 36 can be installed, and the switching operation of the second changeover switch 35 of the refrigerant supply switching controller 33 can be matched. And controlling the first refrigerant control valve 31 to be closed when the system is over-pressed, allowing only a small flow of refrigerant to be delivered, and controlling the second refrigerant control valve 36 to be closed when a non-overpressure is detected, and allowing A large flow rate of refrigerant is delivered, whereby the refrigeration system can be controlled to achieve pressure balance, and the compressor 11 is tripped without overloading, so that the object of the present invention can be achieved.

However, the above is only the embodiment of the present invention, and the scope of the invention is not limited thereto, and all the equivalent equivalent changes and modifications according to the scope of the patent application and the patent specification of the present invention are still The scope of the invention is covered.

1‧‧‧Condensation unit

11‧‧‧Compressor

12‧‧‧Condenser

13‧‧‧Refrigerant Controller

342‧‧‧second junction

343‧‧‧ third joint

344‧‧‧Control contacts

345‧‧‧fourth joint

2‧‧‧Evaporator

21‧‧‧First refrigerant delivery line

22‧‧‧Second refrigerant delivery line

3‧‧‧ Pressure balance control device

31‧‧‧First refrigerant control valve

32‧‧‧ Temperature Control Unit

321‧‧‧Temperature Detector

322‧‧‧temperature controller

323‧‧‧Electric heater

324‧‧‧thermal switch

33‧‧‧Refrigerant supply switching controller

34‧‧‧First switch

341‧‧‧ first joint

347‧‧‧Power contacts

348‧‧‧Power contacts

35‧‧‧Second switch

351‧‧‧ fifth junction

352‧‧‧ sixth junction

353‧‧‧ seventh junction

354‧‧‧Control contacts

355‧‧‧Power contacts

36‧‧‧Second refrigerant control valve

37‧‧‧ Pressure Control Unit

371‧‧‧ Pressure detector

372‧‧‧Voltage control switch

N‧‧‧ node

Other features and advantages of the present invention will be apparent from the embodiments of the present invention, wherein: FIG. 1 is a block diagram illustrating a first embodiment of the refrigeration system of the present invention; FIG. 2 is a circuit diagram, an auxiliary diagram 1 is a refrigerant supply switching controller of the first embodiment; FIG. 3 is a block diagram showing a second embodiment of the refrigeration system of the present invention; and FIG. 4 is a circuit diagram, and FIG. 3 is a second embodiment. A refrigerant supply switching controller.

1‧‧‧Condensation unit

11‧‧‧Compressor

12‧‧‧Condenser

13‧‧‧Refrigerant Controller

2‧‧‧Evaporator

21‧‧‧First refrigerant delivery line

323‧‧‧Electric heater

324‧‧‧thermal switch

33‧‧‧Refrigerant supply switching controller

34‧‧‧First switch

341‧‧‧ first joint

342‧‧‧second junction

3‧‧‧ Pressure balance control device

31‧‧‧First refrigerant control valve

32‧‧‧ Temperature Control Unit

321‧‧‧Temperature Detector

322‧‧‧temperature controller

343‧‧‧ third joint

344‧‧‧Control contacts

345‧‧‧fourth joint

347‧‧‧Power contacts

348‧‧‧Power contacts

Claims (10)

A refrigeration system having a pressure balance function, comprising: a condensing unit for providing a liquid refrigerant; a first refrigerant conveying line for receiving the refrigerant of the condensing unit and conveying the refrigerant to an evaporator, The liquid-to-gas ratio conversion is performed on the evaporator; a pressure balance control device includes a temperature control unit for determining whether the temperature of the evaporator is abnormal and generating a temperature adjustment trigger signal, and the temperature adjustment trigger signal is in a temperature adjustment a level and a non-tempering level change, a first refrigerant control valve is disposed in the first refrigerant delivery line, and determines whether to transfer the refrigerant from the condensing unit to the first refrigerant delivery line according to whether a valve opening signal is received a first refrigerant delivery line, and a refrigerant supply switching controller electrically connected to the temperature control unit and the first refrigerant control valve to receive a temperature adjustment trigger signal from the temperature control unit, and according to the temperature adjustment trigger signal a level to determine whether to output the valve opening signal to the first refrigerant control valve, the refrigerant supply switching controller of the pressure balance control device The first switch has a first contact electrically connected to the first refrigerant control valve, and is configured to output the valve open signal, a second contact, receive the valve open signal, and a third contact , a control contact electrically connected to the temperature control unit to receive the temperature adjustment trigger signal, and selectively establishing the second contact and the first contact and the third connection according to the level of the temperature adjustment trigger signal Pointing an electrical connection of the one, and causing the valve opening signal to be transmitted to the one of the first contact and the third contact via the second contact; when the temperature control unit determines the temperature of the evaporator Abnormally, the temperature adjustment trigger signal received by the refrigerant supply switching controller is at the temperature adjustment level, and the refrigerant supply switching controller does not output the valve opening signal to the first refrigerant control valve, so that the first refrigerant control valve Closing, and blocking the delivery of refrigerant from the condensing unit to the first refrigerant delivery line. The refrigeration system of claim 1, wherein the temperature control unit of the pressure balance control device comprises a temperature detector for detecting the temperature of the evaporator, a temperature controller, according to the evaporator The temperature and a set temperature generate the valve opening signal and a thermal energy control signal, and an electric heater provides or interrupts the electric heating energy to the evaporator according to the level of the temperature adjustment trigger signal, when the temperature adjustment trigger signal is in the adjustment The electric heating device provides electric heating energy. When the temperature adjustment triggering level is at the non-tempering temperature level, the electric heater interrupts the supply of electric heating energy, and a thermal control switch electrically connects the temperature controller and the electric heating. And the refrigerant supply switching controller, and according to the control of the thermal energy control signal of the temperature controller, generating the temperature adjustment trigger signal at one of the temperature regulation level and the non-temperature regulation level. The refrigeration system of claim 1, wherein the first refrigerant delivery line is a refrigerant that delivers a first flow rate from the condensing unit, and the refrigeration system further comprises: a second refrigerant delivery line for Delulating a second flow of refrigerant from the condensing unit to the evaporator, and the second flow rate is less than the first flow rate; and the pressure balance control device further includes a second refrigerant control valve disposed at the second refrigerant delivery a pipeline, and depending on whether the valve opening signal is received to determine whether to transfer the refrigerant from the condensing unit to the second refrigerant conveying pipeline; and a pressure control unit electrically connecting the second of the refrigerant supply switching controller a switch for determining whether the pressure of the condensing unit is abnormal and generating a pressure trigger signal to the second switching switch of the refrigerant supply switching controller, and the pressure triggering signal is at an overvoltage level and a non-overvoltage Level change; when the pressure control unit determines that the pressure of the condensing unit is abnormal and the pressure is triggered by the second switching switch of the refrigerant supply switching controller The signal is at the overvoltage level, the second switching switch of the refrigerant supply switching controller does not output the valve opening signal to the first refrigerant control valve, and outputs the valve opening signal to the second refrigerant control valve, so that the first The second refrigerant control valve is opened and the second flow of refrigerant is delivered to the second refrigerant delivery line. The refrigeration system of claim 3, wherein the pressure control unit of the pressure balance control device comprises a pressure detector for detecting the refrigerant pressure of the condensing unit and generating a pressure detection value, and a voltage control switch electrically connected to the pressure detector and the refrigerant supply switching controller, and according to the The pressure detection value of the pressure detector determines the level of the pressure trigger signal; when the pressure detection value received by the pressure control switch reaches an upper limit value, the voltage control switch outputs the pressure trigger signal to the The overvoltage level; when the pressure detection value received by the voltage control switch reaches a lower limit value, the voltage control switch outputs the pressure trigger signal to the non-overvoltage level. The refrigeration system of claim 3, wherein the refrigerant supply switching controller of the pressure balance control device further comprises a second switch having a fifth contact electrically connected to the first switch Receiving the valve opening signal, a sixth contact, electrically connecting the first refrigerant control valve, and when establishing an electrical connection with the fifth contact, outputting the valve opening signal to the first refrigerant a control valve, a seventh contact, electrically connected to the second refrigerant control valve, and when establishing an electrical connection with the fifth contact, outputting the valve open signal to the second refrigerant control valve, a control contact Electrically connecting the pressure control unit, and selectively establishing an electrical connection between the fifth contact and one of the sixth contact and the seventh contact according to the level of the pressure trigger signal, so that the electrical connection is made Valve open The enable signal is transmitted to the sixth contact and the seventh contact via the fifth contact. A pressure balance control device adapted to be mounted to a refrigeration system, the refrigeration system comprising a condensing unit for providing a liquid refrigerant, a refrigerant for receiving the condensing unit, and conveying the refrigerant to a liquid to gaseous state a first refrigerant delivery line of the converted evaporator, and the pressure balance control device comprises: a temperature control unit for determining whether the temperature of the evaporator is abnormal, thereby determining whether to generate a temperature adjustment trigger signal, and the temperature adjustment The trigger signal is converted at a temperature regulation level and a non-temperature regulation level; a first refrigerant control valve is disposed in the first refrigerant delivery line, and determines whether to make the condensation from the first refrigerant delivery line according to whether a valve opening signal is received The refrigerant of the unit is delivered to the first refrigerant delivery line; and a refrigerant supply switching controller electrically connected to the temperature control unit and the first refrigerant control valve to receive a temperature adjustment trigger signal from the temperature control unit, and Determining whether to output the valve opening signal to the first refrigerant control valve according to the level of the temperature adjustment trigger signal; when the temperature control unit judges The temperature of the evaporator is abnormal and the temperature adjustment trigger signal received by the refrigerant supply switching controller is at the temperature adjustment level, and the refrigerant supply switching controller does not output the valve opening signal to the first refrigerant control valve, so that the The first refrigerant control valve is closed, and the refrigerant from the condensing unit is blocked from being delivered to the first refrigerant delivery line, and the refrigerant supply switching controller of the pressure balance control device includes a first changeover switch having a first contact electrically connected to the first refrigerant control valve, and configured to output the valve opening signal, a second contact, receiving the valve opening signal, a third contact, a control contact, and electrical Connecting the temperature control unit to receive the temperature adjustment trigger signal, and selectively establishing the electrical property of the second contact and the first contact and the third contact according to the level of the temperature adjustment trigger signal Connecting, the valve opening signal is transmitted to the one of the first contact and the third contact via the second contact. The pressure balance control device of claim 6, wherein the temperature control unit comprises a temperature detector for detecting the temperature of the evaporator, a temperature controller, and a setting according to the temperature of the evaporator Temperature, generating the valve opening signal and a thermal energy control signal, an electric heater, providing or interrupting the electric heating energy to the evaporator according to the level of the temperature adjustment trigger signal, when the temperature adjustment trigger signal is at the temperature adjustment level, The electric heater provides electric heating energy. When the temperature adjustment triggering level is at the non-tempering level, the electric heater interrupts the supply of electric heating energy, and a thermal control switch electrically connects the temperature controller, the electric heater and the refrigerant. Supplying a switching controller, and generating, according to the control of the thermal energy control signal of the temperature controller, the temperature adjustment trigger signal at one of the temperature regulation level and the non-temperature regulation level. The pressure balance control device of claim 6, the refrigeration system further comprising a second cold for conveying the refrigerant from the condensing unit to the evaporator a medium conveying pipeline, wherein the first refrigerant conveying pipeline of the freezing system is conveying a first flow of refrigerant, the second refrigerant conveying pipeline is conveying a second flow of refrigerant, and the second flow is smaller than the first flow The pressure balance control device further includes: a second refrigerant control valve disposed in the second refrigerant delivery line, and determining whether to transfer the refrigerant from the condensing unit to the second according to whether the valve opening signal is received a refrigerant delivery line; and a pressure control unit electrically connected to the refrigerant supply switching controller for determining whether the pressure of the condensing unit is abnormal and generating a pressure trigger signal to the refrigerant supply switching controller, and the pressure The trigger signal is changed at an overvoltage level and a non-overvoltage level; when the pressure control unit determines that the pressure of the condensing unit is abnormal and the pressure trigger signal received by the refrigerant supply switching controller is at the overvoltage level, The refrigerant supply switching controller does not output the valve opening signal to the first refrigerant control valve, and outputs the valve opening signal to the second refrigerant control valve Such that the second refrigerant control valve is opened and the second refrigerant flow delivered to the second conduit for transporting refrigerant. The pressure balance control device of claim 8, wherein the pressure control unit comprises a pressure detector for detecting a refrigerant pressure of the condensing unit, generating a pressure detection value, and a pressure control switch. Electrically connecting the pressure detector and the refrigerant supply switching controller, and determining a level of the pressure trigger signal according to the pressure detection value of the pressure detector; When the pressure detection value received by the voltage control switch reaches an upper limit value, the voltage control switch outputs the pressure trigger signal to the overvoltage level; when the pressure detection value received by the voltage control switch reaches a value The limit value, the voltage control switch outputs the pressure trigger signal to the non-overvoltage level. The pressure balance control device of claim 8, wherein the refrigerant supply switching controller further comprises a second switch having a fifth contact electrically connected to the fourth contact of the first switch Receiving the valve opening signal, a sixth contact, electrically connecting the first refrigerant control valve, and when establishing an electrical connection with the fifth contact, outputting the valve opening signal to the first refrigerant control valve, a seventh contact electrically connected to the second refrigerant control valve, and when establishing an electrical connection with the fifth contact, outputting the valve opening signal to the second refrigerant control valve, a control contact, and an electrical connection The pressure control unit selectively establishes an electrical connection between the fifth contact and one of the sixth contact and the seventh contact according to the level of the pressure trigger signal, so that the valve opening signal is The fifth contact is transmitted to one of the sixth contact and the seventh contact.