TW201809559A - A circulating cooling system capable of controlling the temperature of cooling medium precisely - Google Patents

Abstract

A circulating cooling system capable of controlling the temperature of cooling medium precisely is aimed at cooling machines. The circulating cooling system includes a cooling device, a circulating device capable of exchanging heat with the cooling device and cooling the machines, and a control interface controlling the cooling device and the circulating device. An integrated controller disposed among the control interface, a first inverter aimed at controlling a compressor of the cooling device, and a second inverter aimed at controlling a pump of the circulating device can sense the temperature of the cooling medium in a liquid storage tank of the circulating device. The integrated controller further calculates the difference between the setting temperature of the control interface and the temperature of the cooling medium and then computes respective operating frequencies of the compressor and the pump. The first and second inverters further control the compressor and the pump respectively based on the operating frequencies, thereby achieving the temperature equilibrium of the cooling medium speedily and controlling the temperature of the cooling medium with great precision.

Description

Cooling circulation system for precise temperature control of cooling processing media

The invention relates to a cooling circulation system, in particular to a cooling circulation system capable of precisely temperature-controlled cooling processing medium.

In addition, the cooling circulation system 1 is not only widely used in general industrial process equipment, such as the machine tool 2, but also commonly used in household appliances such as refrigerators and air-conditioning systems. The following is an example of the machine tool 2; As shown, the conventional cooling cycle system 1 includes a cooling device 11, a circulation device 12 cooled by the cooling device 11 and cooled for the machine tool 2, and a compressor that controls the cooling device 11 and the circulation device 12 to operate. And a frequency converter 14 for controlling the compressor 13; wherein the cooling device 11 has a cooling group 111 driven by the compressor 13, and a refrigerant circulating in the cooling device 11 (not shown) In addition, the circulation device 12 has a cooling processing medium (such as water or oil, not shown) circulating in the circulation device 12, and a liquid storage tank 121 for recovering the cooling processing medium flowing through the machine tool 2, And a pump 122 connected to the liquid storage tank 121 and outputting the cooling processing medium in the liquid storage tank 121, and the cooling processing medium outputted by the pump 122 passes through the cooling group 111 and flows to the machine tool 2 on use.

Continuing the foregoing, by activating the frequency converter 14, the frequency converter 14 further interlocks the compressor 13, and the compressor 13 compresses the refrigerant into the cooling group 111 for cooling operation, which utilizes the heat absorption evaporation of the refrigerant. The cooling operation is performed, and the refrigerant and the cooling processing medium extracted by the pump 122 driven by the compressor 13 perform heat exchange in the cooling group 111, and the cooled cooling processing medium enters the machine tool 2, and the cooling medium Cooling the processing medium returns to the liquid storage tank 121 after taking away the heat of the machine tool 2, and the refrigerant is again compressed into the cooling group 111 by the compressor 13 for cooling operation, by Such continuous cycle operation causes the temperature of the cooling processing medium to continuously decrease, and the cryogenically cooled cooling processing medium enters the equipment to be cooled and takes the heat away, and then enters the liquid storage tank 121 to circulate again, thereby completing the cooling cycle.

However, after actual use, it is found that the frequency converter 14 of the conventional cooling cycle system 1 mainly adopts an ON-OFF control method according to the temperature of the cooling processing medium, but the temperature of the cooling processing medium changes. There may be residual cooling and residual heat, which may cause the inverter 14 to fail to achieve high-precision temperature control of the cooling processing medium. Further, in order to maintain the temperature of the cooling processing medium constant, the inverter 14 may be activated too frequently or Stopping the compressor 13 is not only easy to cause damage to the compressor 13, but is more likely to affect its service life, which needs to be improved.

Therefore, the object of the present invention is to provide a cooling cycle system capable of precisely temperature-controlled cooling processing medium, which can individually set the operating frequency for the compressor and the pump, so that the cooling processing medium of the cooling cycle system can quickly reach equilibrium. In order to achieve high precision temperature control of the cooling processing medium.

Therefore, the present invention can precisely control the cooling circulation system of the cooling processing medium, the cooling circulation system includes a cooling device, a circulation device, and a control interface for controlling the cooling device and the circulation device to operate; wherein the control interface, An integrated controller is disposed between the first inverter that controls the compressor of the cooling device and the second inverter that controls the pump of the circulation device, and the integrated controller can detect the cooling processing in the liquid storage tank of the circulation device The temperature of the medium; that is, when the set temperature is released through the control interface, the integrated controller calculates the error value between the set temperature and the temperature of the cooling processing medium, and further calculates the compressor and the pump individual The required operating frequency not only reduces the problem that the compressor is easily damaged due to the ON-OFF control method, but also achieves the temperature balance of the cooling processing medium quickly and stably, thereby effectively improving the cooling. The precision of the temperature control of the processing medium.

The above and other technical contents, features, and advantages of the present invention will become apparent from the Detailed Description of the <RTIgt;

Referring to FIG. 2 to FIG. 4, the first preferred embodiment of the cooling cycle system 3 for accurately temperature-controlling a cooling processing medium according to the present invention, the cooling cycle system 3 performs cooling processing on the tool to be cooled 4, and the cooling cycle The system 3 comprises a cooling device 31, a circulation device 32 cooled by the cooling device 31 and cooling the cooling device 4, and a control interface 33 for controlling the cooling device 31 and the circulation device 32. The control interface 33 The set temperature T ¹ of the cooling processing medium to be supplied to the cooling implement 4 can be set, and the control interface 33 can also be switched to the parameter adjustment mode to set system parameters (not shown).

Referring to FIG. 2, the cooling device 31 has a compressor 311, a refrigerant (not shown) circulating in the cooling device 31, a first inverter 312 that controls the compressor 311, and a compression device. The cooling group 313 driven by the machine 311; further, referring to FIG. 3, the circulation device 32 has a cooling processing medium (such as water or oil, not shown) circulating in the circulation device 32, and a recycling flow through the device to be cooled a liquid storage tank 321 for cooling the processing medium, a pump 322 connected to the liquid storage tank 321 and capable of extracting the processing medium in the liquid storage tank 321, and a second frequency converter 323 for controlling the pump 322. Referring to FIG. 4, an integrated controller 34 is disposed between the control interface 33 and the first and second inverters 312 and 323, and the integrated controller 34 can detect the temperature of the cooling processing medium in the liquid storage tank 321 T ² is transmitted to the control interface 33 so that the user can read the temperature T ² (not shown) of the cooling processing medium in the liquid storage tank 321 through the control interface 33.

Continuing the foregoing, the compressor 311 and the pump 322 can be controlled by the same frequency converter (not shown), and in this embodiment, two frequency converters, that is, the first frequency converter that controls the compressor 311 are used. 312 and the second inverter 323 for controlling the pump 322 are described as an example. The cooling group 313 has a condenser 3131 connected to the compressor 311, an expansion valve 3132 connected to the condenser 3131, and a An evaporator 3133 between the compressor 311 and the expansion valve 3132 is connected, and the evaporator 3133 is configured to flow a cooling processing medium output by the pump 322. The cooling group 313 has the condenser 3131 and the expansion. Valve 3132, and the evaporator 3133 are illustrated as an example, as shown in FIG.

Referring to FIG. 4, the user inputs the set temperature T ¹ to the integrated controller 34 through the control interface 33, and the integrated controller 34 senses the temperature T ² of the cooling processing medium in the liquid storage tank 321 . And calculating an error value between the set temperature T ¹ and the temperature T ² of the cooling processing medium in the liquid storage tank 321 , and the integrated controller 34 calculates a control unit 311 by using the error value. An operating frequency V ¹ , and a second operating frequency V ² that controls the pump 322 , and the integrated controller 34 further transmits the first and second operating frequencies V ¹ and V ² to the first and the second The two inverters 312 and 323 further drive or suppress the operation of the compressor 311 and the pump 322 according to the first operating frequency V ¹ and the second operating frequency V ² .

Continuing the foregoing, the compressor 311 receives the first operating frequency V ^{1 of} the first frequency converter 312 to instruct to adjust the cycle frequency and speed of the refrigerant (not shown), and the refrigerant flows through the evaporator 3133. And generating heat exchange with the cooling processing medium. After absorbing the heat of the cooling processing medium, the refrigerant enters the expansion valve 3132 and the condenser 3131, thereby lowering the temperature of the refrigerant itself and re-entering the compressor 311. Cycling, and the pump 322 receives the second operating frequency V ^{2 of} the second frequency converter 323 to in turn adjust the cycle frequency and speed (not shown) of the cooling processing medium, and the cooling processing medium flows through the evaporator 3133 and lowering the temperature by the refrigerant, the cooling processing medium further enters the equipment to be cooled 4, thereby taking away the heat of the equipment to be cooled 4, and the cooled processing medium is re-entered through the liquid storage tank 321 cooling circulation pump 322, so that the cooling process medium to reach a temperature T ² of the high-precision control.

In addition, the first and second frequency converters 312, 323 are connected by the integrated controller 34, which can provide the first and second frequency converters 312, 323 protection functions such as overvoltage, low voltage, overcurrent and grounding. The first and second frequency converters 312, 323 can also feed back the working signals of the compressor 311 and the pump 322 to the integrated controller 34 (not shown) so that the integrated controller 34 The overall condition of the cooling cycle system 3 is grasped.

In order to prove the state of the method of the present invention and the actual use, the following experimental examples are proposed to illustrate:

The cooling circulation system 3 can be roughly classified into an oil cooling circulation system and a water cooling circulation system according to the cooling processing medium, and the present invention will actually test the oil cooling circulation system and the water cooling circulation system respectively after being controlled by the cooling circulation system 3 The oil cooling circulation system and the water cooling circulation system respectively control the temperature at light load, half load and full load.

Referring to FIG. 5, in the first experimental example of the present invention, the oil cooling circulation system is provided with a light load (about 0.3 Kw), a half load (about 0.54 Kw), and a full load (about 1.1 Kw). The temperature control data graph of the temperature, which shows that the oil cooling circulation system reaches the steady state after about 100 seconds, and the oil cooling circulation system has a half hour temperature after adding light load, half load and full load. In the controlled condition, it can be found that the cooling cycle system 3 can control the temperature error of the cooling processing medium within ±0.1 °C.

Referring to FIG. 6, in the experimental example 2 of the present invention, the water cooling circulation system is provided with a light load (about 0.3 Kw), a half load (about 0.54 Kw), and a full load (about 1.1 Kw). Temperature temperature control data graph showing that the water cooling cycle system reaches a steady state after about 60 seconds, and the water cooling cycle system has a half hour temperature after adding light load, half load and full load In the controlled condition, it can be found that the cooling cycle system 3 can control the temperature error within ±0.1 °C.

In summary, it is known that the cooling cycle system 3 of the present invention capable of accurately temperature-controlled cooling processing medium replaces the conventional ON-OFF control method, and the set temperature T ^{1 is} performed by the integrated controller 34. The integration of the temperature T ² of the processing medium in the liquid storage tank 321 further instructs the first and second frequency converters 312, 323 to drive or suppress the compressor 311 and the pump 322, etc., by the above test result It can be known that the cooling cycle system 3 for the oil cooling processing medium and the cooling circulation system 3 of the water cooling processing medium can control the temperature error within ±0.1 °C.

In summary, the present invention can precisely control the cooling cycle system of the cooling processing medium, and the integrated controller receives the set temperature, and detects the temperature of the cooling processing medium in the liquid storage tank, thereby calculating the set temperature and the The error value between the temperatures of the processing medium in the liquid storage tank, the integrated controller calculates the first and second operating frequencies for controlling the compressor and the pump according to the error value, and finally, the integrated controller will The first and second operating frequencies are transmitted to the first and second frequency converters, so that the first and second frequency converters further drive or inhibit the operation of the compressor and the pump, and therefore, the cooling cycle system utilizes an increase Or a method of reducing the speed of the compressor, rather than the conventional ON-OFF control method, which not only reduces the possibility of damage to the compressor, but also greatly increases the speed of the temperature of the cooling processing medium, and further Effectively increase the accuracy of the temperature control of the cooling process medium.

The above is only the preferred embodiment of the present invention, and the scope of the present invention is not limited thereto, that is, the simple equivalent changes and modifications made in accordance with the scope of the present invention and the contents of the description of the invention. All should remain within the scope of the invention patent.

(known)

1‧‧‧Cooling Circulatory System

11‧‧‧Cooling device

12‧‧‧Circulation device

13‧‧‧Compressor

14‧‧‧Inverter

111‧‧‧Cooling group

121‧‧‧ liquid storage tank

122‧‧‧ pump

2‧‧‧Tool machine

(this invention)

3‧‧‧Cooling Circulatory System

31‧‧‧Cooling device

32‧‧‧Circulation device

33‧‧‧Control interface

34‧‧‧Integrated controller

311‧‧‧Compressor

312‧‧‧First frequency converter

313‧‧‧Cooling group

321‧‧‧ liquid storage tank

322‧‧‧ pump

323‧‧‧Second frequency converter

3131‧‧‧Condenser

3132‧‧‧Expansion valve

3133‧‧‧Evaporator

T ¹ ‧‧‧Set temperature

T ² ‧‧‧ Cooling process medium temperature

V ¹ ‧‧‧First operating frequency

V ² ‧‧‧second operating frequency

4‧‧‧Warming equipment to be cooled

1 is a block flow diagram of a conventional cooling cycle system. 2 is a partial block flow diagram of a first preferred embodiment of the present invention. Figure 3 is a block diagram of another partial block of the first preferred embodiment. Figure 4 is a block diagram of the overall block of the first preferred embodiment. Figure 5 is a graph of temperature control data of the first preferred embodiment. Figure 6 is a graph of another temperature control data of the first preferred embodiment.

Claims (3)

A cooling circulation system capable of precisely temperature-controlled cooling processing medium, wherein the cooling circulation system cools a device to be cooled, and the cooling circulation system includes a cooling device cooled by the cooling device and cooled for the device to be cooled a circulation device, and a control interface for controlling the operation of the cooling device and the circulation device; wherein the cooling device has a compressor, a refrigerant circulating in the cooling device, and a first frequency converter for controlling the compressor, And a cooling group connected to the compressor; further, the circulating device has a cooling processing medium circulating in the circulating device, and a liquid storage tank for recovering the cooling processing medium of the equipment to be cooled, and is connected to the liquid storage tank And pumping the cooling processing medium in the liquid storage tank, and a second frequency converter that controls the pump, and the cooling processing medium of the pump output is cooled by the cooling group and flows to the equipment to be cooled The control interface can set the temperature of the cooling processing medium for supplying the equipment to be cooled; An integrated controller is disposed between the control interface and the first frequency converter and the second frequency converter, and the integrated controller senses a temperature of the cooling processing medium in the liquid storage tank, and the integrated controller calculates the control The error between the set temperature of the interface and the temperature of the cooling solution output cooling medium, and the integrated controller calculates the individual operating frequencies for controlling the compressor and the pump according to the error value. According to the scope of claim 1, the cooling cycle system capable of precisely controlling the cooling processing medium, wherein the pump and the compressor can be controlled by the same frequency converter. The cooling cycle system capable of precisely temperature-controlled cooling processing medium according to claim 1, wherein the cooling group has a condenser connected to the compressor, an expansion valve connected to the condenser, and a connection An evaporator between the compressor and the expansion valve, and the evaporator supplies a cooling processing medium for the pump output.