Liquid cooling unit with high control precision

Abstract

The utility model provides a liquid cooling unit with high control precision. The liquid cooling unit comprises a machine body; the cooling mechanism is arranged in the machine body, the cooling mechanism comprises an evaporator, a compressor, a drying filter, a condenser, a gas path throttling valve, a gas path bypass valve, a condensation fan and a detection control mechanism, and the detection control mechanism is arranged in the machine body; the detection control mechanism comprises a condensation temperature sensor and an evaporation temperature sensor. According to the liquid cooling unit with the high control precision, real-time working values such as the condensation temperature, the evaporation temperature, the temperature before throttling, the air return temperature and the evaporation pressure are detected through the temperature sensors, the superheat degree is calculated, and the supercooling degree is compared with a target value; and the refrigerant flow of the gas path throttle valve and the gas path bypass valve is calculated through a PID algorithm, and the opening degree is adjusted in real time, so that the refrigerant flow is matched with the refrigerating capacity required by a user load, and therefore, a unit can work normally, and the optimal temperature control precision is obtained.

Description

Technical Field

[0001] The utility model relates to the field of liquid cooling units, in particular to a liquid cooling unit with high control accuracy. Background Art

[0002] In the field of industrial refrigeration, with the development of science and technology, due to the increasing integration of equipment, the heat generated during operation is large and concentrated. If the temperature cannot be accurately controlled, the performance will be reduced or even damaged. In addition, the heat generated by machine tools and other processing equipment during the processing process causes thermal deformation, which has seriously affected the processing accuracy of machine tools. Therefore, new requirements are put forward for the precise control of equipment temperature, not only constant temperature control, but also high-precision constant temperature control. In addition, due to the large changes in the operating environment of industrial equipment, the cooling capacity requirements for the minimum working condition and the large load working condition can sometimes change by dozens of times, which puts forward higher requirements for precise constant temperature control.

[0003] In the prior art, the temperature control principle of the liquid cooling unit is to give the unit a set temperature, start the compressor cooling when it is detected that the load liquid temperature is 1~2℃ higher than the set temperature, and stop the compressor cooling when it is detected that the load liquid temperature is 1~2℃ lower than the set temperature, and repeat this cycle over and over again. This temperature control method has poor temperature control accuracy, generally ±2%.

[0004] In the prior art, there is also a temperature control principle of a variable frequency liquid cooling unit. Given a set temperature for the unit, when it is detected that the load liquid temperature is higher than the set temperature, the variable frequency compressor increases the operating frequency. When it is detected that the load liquid temperature is lower than the set temperature, the variable frequency compressor increases the operating frequency. This control method has high temperature control accuracy, but still has two defects: 1. The minimum operating frequency of the variable frequency compressor is generally 30Hz. When the user load is light, the variable frequency compressor still has a shutdown problem, which will cause a decrease in temperature control accuracy; 2. The liquid cooling machine using variable frequency control needs to be equipped with a variable frequency compressor, a variable frequency drive, etc., which increases the cost a lot.

[0005] Therefore, it is necessary to provide a liquid cooling unit with high control accuracy to solve the above technical problems. Summary of the invention

[0006] The utility model provides a liquid cooling unit with high control accuracy, which solves the problem of low constant temperature control accuracy of machine tool processing, automatic control equipment and laser processing equipment.

[0007] In order to solve the above technical problems, the utility model provides a liquid cooling unit with high control accuracy, comprising:

[0008] Body;

[0009] A cooling mechanism is arranged in the body, and the cooling mechanism includes an evaporator, a compressor, a drying filter, a condenser, an air circuit throttle valve, an air circuit bypass valve, and a condensing fan. The evaporator is fixedly installed on the lower half of the inner wall of the body, the compressor is connected to the evaporator through a pipeline, the evaporator is connected to the air circuit throttle valve through a pipeline, the air circuit throttle valve is connected to the condenser through a pipeline, the condenser is connected to the compressor through a pipeline, the air circuit bypass valve is respectively connected to the evaporator and the air circuit throttle valve through a pipeline, the air circuit bypass valve is respectively connected to the compressor and the condenser through a pipeline, and the condensing fan is installed on the top of the body.

[0010] A detection and control mechanism is arranged in the machine body, and the detection and control mechanism includes a condensing temperature sensor, an evaporating temperature sensor, an ambient temperature sensor, a temperature sensor before the throttle valve, a compressor return air temperature sensor, a pressure sensor, a control panel, and a liquid temperature sensor. The condensing temperature sensor is installed at two-thirds of the condenser, the evaporating temperature sensor is installed at two-thirds of the evaporator, the ambient temperature sensor is installed at the front of the machine body, the temperature sensor before the throttle valve is installed at fifty millimeters from the front end of the gas circuit throttle valve, the compressor return air temperature sensor is installed at one hundred millimeters of the compressor return air pipe close to the compressor, the pressure sensor is installed on the connecting pipeline between the compressor and the evaporator, the liquid temperature sensor is installed at the return water port of the machine body, and the control panel is installed at the front of the machine body.

[0011] Preferably, the control panel is arranged on the top of the ambient temperature sensor.

[0012] Preferably, the gas circuit throttle valve is arranged on the top of the gas circuit bypass valve.

[0013] Preferably, a baffle is provided on the front of the control panel, and a sliding frame is slidably connected to the top and bottom of the outer side surface of the baffle.

[0014] Preferably, a slide groove is provided on the front side of the slide frame, and an inner side surface of the slide groove is slidably connected to a limiting block, and the limiting block is fixedly installed on the left end of the front side of the baffle.

[0015] Preferably, a cleaning brush is fixedly mounted on the left end of the back side of the baffle, and the back side of the cleaning brush is arranged on the front side of the control panel.

[0016] Preferably, the back side of the sliding frame is fixedly mounted to the front side of the body.

[0017] Compared with the related art, the liquid cooling unit with high control accuracy provided by the utility model has the following beneficial effects:

[0018] The utility model provides a liquid cooling unit with high control accuracy. The unit detects real-time working values ​​such as condensing temperature, evaporating temperature, pre-throttling temperature, return air temperature, evaporating pressure, etc. through temperature sensors, calculates superheat and subcooling and compares them with target values, calculates the refrigerant flow of the gas path throttle valve and the gas path bypass valve through a PID algorithm and adjusts the opening in real time to match the refrigeration capacity required by the user load, thereby allowing the unit to work normally and achieve optimal temperature control accuracy. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] Figure 1 A schematic structural diagram of a first embodiment of a liquid cooling unit with high control accuracy provided by the utility model;

[0020] Figure 2 for Figure 1 A cross-sectional view of the AA surface shown;

[0021] Figure 3 A schematic diagram of the structure of a liquid cooling unit with high control accuracy provided by the utility model when in use;

[0022] Figure 4 A structural schematic diagram of a second embodiment of a liquid cooling unit with high control accuracy provided by the utility model;

[0023] Figure 5 for Figure 4 Schematic diagram of the baffle structure shown.

[0024] Numbers in the figure: 1. body, 2. cooling mechanism, 21. evaporator, 22. compressor, 23. drying filter, 24. condenser, 25. gas circuit throttle valve, 26. gas circuit bypass valve, 27. condensing fan, 3. detection and control mechanism, 31. condensing temperature sensor, 32. evaporating temperature sensor, 33. ambient temperature sensor, 34. temperature sensor before throttle valve, 35. compressor return air temperature sensor, 36. pressure sensor, 37. control panel, 38 liquid temperature sensor, 4. baffle, 41. push plate, 42. cleaning brush, 43. slide frame, 44. slide groove, 45. limit block. DETAILED DESCRIPTION

[0025] The utility model is further described below in conjunction with the accompanying drawings and implementation modes.

[0026] First embodiment

[0027] Please refer to Figure 1 , Figure 2 , Figure 3 ,in, Figure 1A structural schematic diagram of a first embodiment of a liquid cooling unit with high control accuracy provided by the utility model; Figure 2 for Figure 1 A cross-sectional view of the AA surface is shown; Figure 3 The schematic diagram of the structure of a high-control precision liquid cooling unit provided by the utility model when in use. A high-control precision liquid cooling unit comprises: a body 1;

[0028] A cooling mechanism 2 is arranged in the body 1, and the cooling mechanism 2 includes an evaporator 21, a compressor 22, a drying filter 23, a condenser 24, an air circuit throttle valve 25, an air circuit bypass valve 24, and a condensing fan 27. The evaporator 21 is fixedly installed on the lower half of the inner wall of the body 1, the compressor 22 is connected to the evaporator 21 through a pipeline, the evaporator 21 is connected to the air circuit throttle valve 25 through a pipeline, the air circuit throttle valve 25 is connected to the condenser 24 through a pipeline, the condenser 24 is connected to the compressor 22 through a pipeline, the air circuit bypass valve 26 is connected to the evaporator 21 and the air circuit throttle valve 25 respectively through a pipeline, the air circuit bypass valve 26 is connected to the compressor 22 and the condenser 24 respectively through a pipeline, and the condensing fan 27 is installed on the top of the body 1.

[0029] The detection and control mechanism 3 is arranged in the body 1, and the detection and control mechanism 3 includes a condensing temperature sensor 31, an evaporating temperature sensor 32, an ambient temperature sensor 33, a temperature sensor before the throttle valve 34, a compressor return air temperature sensor 35, a pressure sensor 36, a control panel 37, and a liquid temperature sensor 38. The condensing temperature sensor 31 is installed at two-thirds of the condenser 24, the evaporating temperature sensor 32 is installed at two-thirds of the evaporator 21, the ambient temperature sensor 33 is installed at the front of the body 1, the temperature sensor before the throttle valve 34 is installed at 50 mm from the front end of the gas circuit throttle valve 25, the compressor return air temperature sensor 35 is installed at the return air pipe of the compressor 22, close to the compressor 22, the pressure sensor 36 is installed on the connecting pipeline between the compressor 22 and the evaporator 21, the liquid temperature sensor 38 is installed at the return water port of the body 1, and the control panel 37 is installed at the front of the body 1.

[0030] The control panel 37 is disposed on the top of the ambient temperature sensor 33 .

[0031] The gas circuit throttle valve 25 is arranged on the top of the gas circuit bypass valve 26 .

[0032] The working principle of a high-control precision liquid cooling unit provided by the utility model is as follows:

[0033] The real-time working values ​​of the condensing temperature sensor 31, the evaporating temperature sensor 32, the ambient temperature sensor 33, the temperature sensor before the throttle valve 34, the compressor return air temperature sensor 35, and the pressure sensor 36 are detected by the control panel 37, and the superheat, subcooling, and compressor return air pressure of the refrigeration process are calculated and compared with the target value. The refrigerant flow of the gas circuit throttle valve 25 and the gas circuit bypass valve 26 are calculated by the PID algorithm and the opening is adjusted in real time. When refrigeration is required, the opening of the gas circuit throttle valve 25 is increased, the refrigerant flow increases, and the liquid temperature decreases accordingly. When the load heat decreases, the opening of the gas circuit throttle valve 25 is reduced, the refrigerant flow decreases, and the liquid temperature increases accordingly. When the load heat generation is relatively light and the opening of the gas circuit throttle valve 25 is reduced and the heat exchange amount cannot be balanced, the opening of the gas circuit bypass valve 26 is controlled and adjusted, so as to fine-tune the output refrigeration capacity. When refrigeration is required, the opening of the gas circuit bypass valve 26 is reduced, the refrigerant bypass flow decreases, and the liquid temperature decreases accordingly. When the load heat decreases, the opening of the gas bypass valve 26 increases, the refrigerant bypass flow increases, and the liquid temperature rises accordingly. Through the dual PID control of the gas throttle valve 25 coarse adjustment and the gas bypass valve 26 fine adjustment, the constant temperature control accuracy of the load liquid temperature of the liquid cooling unit with high control accuracy can be effectively controlled;

[0034] By adjusting the gas circuit throttle valve 25 and the gas circuit bypass valve 26, not only can high-precision constant temperature control be achieved, but also the problem of easy overload of the unit's refrigeration state caused by large changes in load conditions can be solved, which greatly increases the service life of the compressor 22 and improves the reliability of the unit. When the user load is large, close the gas circuit bypass valve 26 and adjust the opening of the gas circuit throttle valve 25 to put the unit in the maximum refrigeration state and quickly reduce the load liquid temperature. When the user load is small, adjust the opening of the gas circuit bypass valve 26 and reduce the opening of the gas circuit throttle valve 25 to put the unit in the minimum refrigeration state, avoiding the compressor 22 from shutting down due to too light a load, causing the load liquid temperature to fluctuate;

[0035] The gas bypass valve 26 can achieve high-precision constant temperature control, solve the problem of liquid hammer damage to the compressor 22, and improve the reliability of the unit. The largest proportion of compressor 22 damage is liquid hammer, which is caused by too low return air temperature of the compressor 22 or insufficient evaporation of the refrigerant, resulting in the return air of the compressor 22 mixed with liquid refrigerant. After the liquid refrigerant enters the compressor 22, it dilutes the compressor oil, thereby causing the compressor 22 to be insufficiently lubricated and damaged. The new high-control precision liquid cooling unit can fully judge whether the return air of the compressor 22 contains liquid refrigerant by reading the real-time values ​​of the pressure sensor 36 and the compressor return air temperature sensor 35. If it is judged that the return air of the compressor 22 contains liquid refrigerant, the PID algorithm is used to immediately adjust the opening of the gas bypass valve 26 to increase, so that the hot steam of the refrigerant just compressed by the compressor 22 is pumped into the evaporator 21, which increases the evaporation temperature of the unit, thereby ensuring that the return air of the compressor 22 does not contain liquid refrigerant, avoiding the occurrence of liquid hammer in the compressor 22, and greatly improving the reliability of the unit.

[0036] Compared with the related art, the liquid cooling unit with high control accuracy provided by the utility model has the following beneficial effects:

[0037] The temperature sensor detects the real-time working values ​​such as condensing temperature, evaporating temperature, pre-throttling temperature, return air temperature, evaporating pressure, etc., calculates the superheat and subcooling and compares them with the target values, and calculates the refrigerant flow of the gas circuit throttle valve 25 and the gas circuit bypass valve 26 through the PID algorithm and adjusts the opening in real time to match the cooling capacity required by the user load, so that the unit can work normally and achieve the best temperature control accuracy.

[0038] Second embodiment

[0039] Please refer to Figure 4 and Figure 5 Based on the high control precision liquid cooling unit provided by the first embodiment of the present application, the second embodiment of the present application proposes another high control precision liquid cooling unit. The second embodiment is only a preferred mode of the first embodiment, and the implementation of the second embodiment will not affect the independent implementation of the first embodiment.

[0040] Specifically, the difference of the high-control precision liquid cooling unit provided in the second embodiment of the present application is that, in a high-control precision liquid cooling unit, a baffle 4 is provided on the front of the control panel 37, and the top and bottom of the outer side surface of the baffle 4 are slidably connected with a sliding frame 43.

[0041] A slide groove 44 is formed on the front of the slide frame 43 , and an inner side surface of the slide groove 44 is slidably connected to a limiting block 45 . The limiting block 45 is fixedly installed on the left end of the front of the baffle 4 .

[0042] A cleaning brush 42 is fixedly mounted on the left end of the back side of the baffle 4 , and the back side of the cleaning brush 42 is arranged on the front side of the control panel 37 .

[0043] The back side of the sliding frame 43 is fixedly mounted on the front side of the body 1 .

[0044] The working principle of a high-control precision liquid cooling unit provided by the utility model is as follows:

[0045] When it is necessary to use the user control panel 37, the user can push the push plate 41, so that the push plate 41 drives the baffle 4 to move on the front side of the control panel 37, and at the same time, the top and bottom of the baffle 4 will slide on the inner side of the slide frame 43 to limit the baffle 4. At this time, the baffle 4 will also drive the cleaning brush 42 to slide on the front side of the control panel 37 to clean the control panel 37. After the use of the control panel 37 is finished, the user pushes the baffle 4 again to move the baffle 4 to the front side of the control panel 37, thereby protecting the control panel 37.

[0046] Compared with the related art, the liquid cooling unit with high control accuracy provided by the utility model has the following beneficial effects:

[0047] By means of the cooperation of structures such as the baffle plate 4, the cleaning brush 42, the slide frame 43, the slide groove 44 and the limit block 45, when in use, the baffle plate 4 is located in front of the control panel 37, thereby protecting the control panel 37 from damage caused by impact, and by driving the cleaning brush 42 to move, the dust on the control panel 37 can be cleaned.

[0048] The above description is only an embodiment of the present invention, and does not limit the patent scope of the present invention. Any equivalent structure or equivalent process transformation made by using the contents of the specification and drawings of the present invention, or directly or indirectly applied in other related technical fields, are also included in the patent protection scope of the present invention.

Claims

1. A liquid cooling unit with high control accuracy, characterized in that: include: Body; A cooling mechanism, wherein the cooling mechanism is arranged in the machine body, and the cooling mechanism comprises an evaporator, a compressor, a drying filter, a condenser, an air circuit throttle valve, an air circuit bypass valve, and a condensing fan. The evaporator is fixedly mounted on the lower half of the inner wall of the machine body, the compressor is connected to the evaporator through a pipeline, the evaporator is connected to the air circuit throttle valve through a pipeline, the air circuit throttle valve is connected to the condenser through a pipeline, the condenser is connected to the compressor through a pipeline, the air circuit bypass valve is respectively connected to the evaporator and the air circuit throttle valve through pipelines, the air circuit bypass valve is respectively connected to the compressor and the condenser through pipelines, and the condensing fan is mounted on the top of the machine body; A detection and control mechanism is arranged in the machine body, and the detection and control mechanism includes a condensing temperature sensor, an evaporating temperature sensor, an ambient temperature sensor, a temperature sensor before the throttle valve, a compressor return air temperature sensor, a pressure sensor, a control panel, and a liquid temperature sensor. The condensing temperature sensor is installed at two-thirds of the condenser, the evaporating temperature sensor is installed at two-thirds of the evaporator, the ambient temperature sensor is installed at the front of the machine body, the temperature sensor before the throttle valve is installed at fifty millimeters from the front end of the gas circuit throttle valve, the compressor return air temperature sensor is installed at one hundred millimeters of the compressor return air pipe close to the compressor, the pressure sensor is installed on the connecting pipeline between the compressor and the evaporator, the liquid temperature sensor is installed at the return water port of the machine body, and the control panel is installed at the front of the machine body.

2. A liquid cooling unit with high control accuracy according to claim 1, characterized in that: The control panel is arranged on the top of the ambient temperature sensor.

3. A liquid cooling unit with high control accuracy according to claim 1, characterized in that: The gas path throttle valve is arranged on the top of the gas path bypass valve.

4. A liquid cooling unit with high control accuracy according to claim 1, characterized in that: A baffle is arranged on the front of the control panel, and a sliding frame is slidably connected to the top and the bottom of the outer side surface of the baffle.

5. A liquid cooling unit with high control accuracy according to claim 4, characterized in that: A sliding groove is provided on the front side of the sliding frame, and an inner side surface of the sliding groove is slidably connected to a limiting block, and the limiting block is fixedly installed on the left end of the front side of the baffle.

6. A liquid cooling unit with high control accuracy according to claim 5, characterized in that: A cleaning brush is fixedly mounted on the left end of the back side of the baffle, and the back side of the cleaning brush is arranged on the front side of the control panel.

7. A liquid cooling unit with high control accuracy according to claim 6, characterized in that: The back side of the sliding frame is fixedly mounted on the front side of the body.

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