High-precision segmented high and low temperature liquid chiller

Abstract

This utility model discloses a high-precision segmented high and low temperature liquid chiller, comprising: a composite refrigeration system, a dual-mode temperature control module, and an intelligent control module. The dual-mode temperature control module operates the compressor and the entire refrigeration system simultaneously during the low-temperature phase, adjusting the hot gas solenoid valve and the liquid injection valve. During the high-temperature phase, it adjusts the cooling proportional valve to control the cooling water flow, with the heater providing auxiliary heating to achieve constant temperature. It also adjusts the speed of the external circulation pump to stabilize the flow rate at the target flow rate within one minute. The intelligent control module regulates the temperature using a PID algorithm, switching to a safety mode and monitoring in real time in case of abnormalities. This utility model offers high temperature control accuracy, good stability, and high efficiency and speed. Through the integrated design of air-cooled segmented high and low temperature cooling with constant temperature and constant flow, it solves industry pain points such as high and low temperature compatibility, high efficiency and speed, and high-precision molding, demonstrating significant technological advancement, commercial application value, and promotional value.

Description

Technical Field

[0001] This utility model relates to the field of laboratory and industrial temperature control equipment, and in particular to a high-precision high and low temperature segmented cooling liquid cooler. Background Technology

[0002] High and low temperature chambers are essential testing equipment in fields such as aviation, automotive, home appliances, and scientific research. They are used to test and determine the parameters and performance of electrical, electronic, and other products and materials after undergoing high-temperature, low-temperature, or constant-temperature tests. Automotive high and low temperature liquid chillers are mainly used for motor testing, motor controller aging testing, battery pack performance testing, fuel cell testing, transmission testing, automotive component testing, and automotive wireless charging testing.

[0003] Traditional air-cooled chillers have unstable and unsustainable temperature control, poor temperature control accuracy, and cannot meet the needs of long-term temperature stability applications.

[0004] Existing chillers have the following problems: poor temperature control accuracy, small operating temperature range, large flow fluctuations, fatigue under high and low temperature changes, currently only able to operate at low or high temperatures, unable to simultaneously meet the requirements of low to high temperatures, large air bubbles in open water tanks leading to large flow fluctuations, insufficient linearity of centrifugal pump flow, repeated changes in high and low temperatures, insufficient stability of the refrigeration system, and even easy damage to the compressor.

[0005] To address the aforementioned issues, a liquid chiller was developed that integrates air cooling, segmented cooling and temperature control from -40 to 180℃, automatic temperature control, and constant water flow, making it suitable for high-precision industrial applications such as semiconductor aging and testing, and automotive parts manufacturing. Utility Model Content

[0006] The technical problem to be solved by this utility model is to provide a high-precision segmented high and low temperature liquid chiller that can quickly reduce the temperature of the test sample, maintain constant flow and temperature of the test sample during use, ensure healthy operation of the compressor, and has high temperature control accuracy.

[0007] To solve the above-mentioned technical problems, the technical solution of this utility model is as follows:

[0008] A high-precision segmented high and low temperature liquid chiller includes: a composite refrigeration system, a dual-mode temperature control module, and an intelligent control module. The intelligent control module is connected to both the composite refrigeration system and the dual-mode temperature control module. The composite refrigeration system includes a compressor, a plate evaporator, a cooling water coil, and a heater. The plate evaporator and the cooling water coil are integrated into a water tank, which is a semi-enclosed structure. The plate evaporator is connected to the compressor and the water tank via piping to form a closed internal circulation system. The water tank is connected to external equipment via piping to form a closed external circulation constant flow system. The dual-mode temperature control module includes a low-temperature section control module and a high-temperature section control module. The low-temperature section control module includes a hot gas solenoid valve and a liquid injection valve. The hot gas solenoid valve is connected to the plate evaporator and oil separator pipelines respectively. The liquid injection valve and the liquid injection expansion valve are connected in series and are connected to the oil separator and the first expansion valve respectively. The low-temperature section control module adjusts the cooling capacity through the hot gas solenoid valve and the liquid injection valve. The high-temperature section control module includes the heater and a proportional valve. The high-temperature section control module coordinates temperature control with the heater through the proportional valve. The intelligent control module includes a temperature sensor, a pressure sensor, and a flow meter. The intelligent control module adjusts the temperature through a PID algorithm, switches to a safety mode in case of abnormality, and monitors in real time.

[0009] In the above structure, the water tank and the external equipment are configured into a closed external circulation constant flow system through the first pipeline and the second pipeline. The first pipeline is equipped with a first ball valve, and the second pipeline is equipped with an external circulation pump, a second ball valve, a pressure sensor and the flow meter. The water tank is equipped with a temperature sensor. The pressure sensor is located adjacent to the external circulation pump. The speed control of the external circulation pump adopts a step algorithm. The response time of the external circulation pump is ≤1 minute, and the flow fluctuation is ≤±0.1L / min.

[0010] In the above structure, the cooling water coil and the heater are arranged alternately in the water tank. The inlet and outlet of the cooling water coil are connected to the external cooling water through the third pipeline and the fourth pipeline, respectively. The proportional valve is arranged on the third pipeline, and a third ball valve is provided between the proportional valve and the inlet of the external cooling water.

[0011] The above structure also includes a replenishment tank, which is connected to the inlet and outlet of the water tank through a fifth pipe and a sixth pipe. The replenishment tank is equipped with a level pipe, a level sensor and a replenishment port.

[0012] In the above structure, the plate evaporator is connected to the water tank through a seventh pipe and an eighth pipe. A fourth ball valve is provided on the seventh pipe, and an internal circulation pump and a flow switch are respectively provided on the eighth pipe. The flow switch is located adjacent to the plate evaporator.

[0013] In the above structure, the plate evaporator and the oil separator are connected by a ninth pipeline and a tenth pipeline. The ninth pipeline is provided with a condenser, a dryer filter and the first expansion valve in sequence. The first end of the first expansion valve is connected to the dryer filter, the second end of the first expansion valve is connected to the plate evaporator, and the third end of the first expansion valve and the third end of the liquid injection expansion valve are respectively connected to the tenth pipeline.

[0014] The above structure also includes an eleventh pipeline, on which the hot gas solenoid valve is installed. The eleventh pipeline is connected in parallel with the tenth pipeline and is then connected to the plate evaporator and oil separator pipelines, respectively.

[0015] In the above structure, the injection valve and the injection expansion valve are connected in series, with one end connected to the compressor and the oil separator pipeline respectively, and the other end connected to the first expansion valve.

[0016] The beneficial effects of this utility model are as follows:

[0017] This invention solves the problems of high and low temperature compatibility, high efficiency and speed, and high-precision molding through an integrated design of air-cooled high and low temperature segmented cooling and constant temperature + constant flow. This invention features high temperature control accuracy and good stability, with perfect compatibility from direct cooling from 180℃ to -40℃ and direct heating from -40℃ to 180℃. The system operates stably, with a temperature control accuracy of ±0.1℃ and flow fluctuation ≤±0.1L / min. It is also highly efficient and fast: the flow stabilization time is shortened to within 1 minute, and the long-term stability error is within 1%. It uses a PID algorithm to adjust the temperature and a stepper algorithm to control the magnetic pump speed to adjust the flow rate. Temperature, pressure, and flow parameters are monitored in real time, and a safety mode is automatically switched in case of abnormalities. This invention offers high temperature control accuracy, good stability, high efficiency and speed, and is safe and reliable. Attached Figure Description

[0018] Figure 1 This is a structural flowchart of an embodiment of the high-precision segmented high and low temperature liquid cooler of this utility model.

[0019] In the diagram, 1-compressor, 2-plate evaporator, 3-cooling water coil, 4-heater, 5-water tank, 6-hot gas solenoid valve, 7-injection valve, 8-oil separator, 9-injection expansion valve, 10-first expansion valve connection, 11-proportional valve, 12-temperature sensor, 13-pressure sensor, 14-flow meter, 15-external equipment, 16-first ball valve, 17-external circulation pump, 18-second ball valve, 19-cooling water coil, 20-third ball valve, 21-replenishment tank, 22-fourth ball valve, 23-internal circulation pump, 24-flow switch, 25-condenser, 26-dryer filter, 27-level pipe, 28-level sensor, 29-replenishment port. Detailed Implementation

[0020] The specific embodiments of this utility model will be further described below with reference to the accompanying drawings. It should be noted that these descriptions are for the purpose of aiding understanding of this utility model, but do not constitute a limitation thereof. Furthermore, the technical features involved in the various embodiments of this utility model described below can be combined with each other as long as they do not conflict with each other.

[0021] like Figure 1 As shown, a high-precision segmented high and low temperature liquid chiller includes: a composite refrigeration system, a dual-mode temperature control module, and an intelligent control module. The intelligent control module is connected to both the composite refrigeration system and the dual-mode temperature control module. The composite refrigeration system includes a compressor 1, a plate evaporator 2, a cooling water coil 3, and a heater 4. The plate evaporator 2 and the cooling water coil 3 are integrated into a water tank 5, which is a semi-enclosed structure. The plate evaporator 2 is connected to the compressor 1 and the water tank 5 via piping to form a closed internal circulation system. The water tank 5 is connected to external equipment via piping to form a closed external circulation constant flow system. The dual-mode temperature control module includes a low-temperature section control module and a high-temperature section control module. The control module includes a low-temperature section control module comprising a hot gas solenoid valve 6 and a liquid injection valve 7. The hot gas solenoid valve 6 is connected to the plate evaporator 2 and the oil separator pipe 8, respectively. The liquid injection valve 7 and the liquid injection expansion valve 9 are connected in series and are connected to the oil separator 8 and the first expansion valve 10, respectively. The low-temperature section control module adjusts the cooling capacity through the hot gas solenoid valve 6 and the liquid injection valve 7. The high-temperature section control module includes a heater 4 and a proportional valve 11. The high-temperature section control module coordinates temperature control with the heater 4 through the proportional valve 11. The intelligent control module includes a temperature sensor, a pressure sensor, and a flow meter. The intelligent control module adjusts the temperature through a PID algorithm, switches to a safety mode in case of abnormality, and monitors in real time.

[0022] Specifically, in this embodiment, a semi-enclosed water tank 5 and a plate evaporator 2 are integrated, with a built-in cooling water coil 3 and a heater 4. A hot gas solenoid valve 6 and a liquid injection valve 7 are used to adjust and switch the temperature in the low-temperature section, and a cooling proportional valve 11 is used to adjust the cooling water volume in the high-temperature section. The heater 4 provides heating assistance to quickly stabilize the temperature.

[0023] Specifically, in this embodiment, the compressor operates during the low-temperature phase, the entire refrigeration system runs, and the hot gas solenoid valve 6 and the liquid pipe solenoid valve are adjusted. During the high-temperature phase, the cooling proportional valve 11 is adjusted to control the cooling water flow, and the heater 4 provides auxiliary heating to achieve constant temperature. The external circulation pump 17 operates, the flow meter 14 detects the flow rate, and the speed of the external circulation pump 17 is adjusted to stabilize the flow rate at the target flow rate within 1 minute.

[0024] Specifically, in this embodiment, the flow control adopts a semi-closed water tank 5, an automatic air venting device, and an external circulation pump 17 to maintain linear flow. By controlling the speed of the external circulation pump 17, the required flow value can be quickly reached.

[0025] In a preferred embodiment of this utility model, the water tank 5 and the external equipment are configured into a closed external circulation constant flow system through the first pipeline and the second pipeline. The first pipeline is equipped with a first ball valve 16, and the second pipeline is equipped with an external circulation pump 17, a second ball valve 18, a pressure sensor 13 and a flow meter 14. The water tank 5 is equipped with a temperature sensor 12. The pressure sensor 13 is located adjacent to the external circulation pump 17. The speed control of the external circulation pump 17 adopts a step algorithm. The response time of the external circulation pump 17 is ≤1 minute, and the flow fluctuation is ≤±0.1L / min.

[0026] Specifically, in this embodiment, the external circulation outlet of the water tank 5 is connected to the inlet of the external circulation pump 17 by a pipeline. A flow meter 14 is installed at the external circulation outlet, and a pressure sensor 13 is installed at the outlet of the flow meter 14, which continues to be the external circulation outlet. The outlet of the external circulation pump 17 is connected to the inlet pipeline of the external device 15, and the outlet of the external device 15 is connected to the inlet pipeline of the external circulation.

[0027] In a preferred embodiment of this utility model, the cooling water coil 19 and the heater 4 are spaced apart in the water tank 5. The inlet and outlet of the cooling water coil 19 are connected to the external cooling water 20 through the third pipeline and the fourth pipeline, respectively. The proportional valve 11 is installed on the third pipeline, and a third ball valve is provided between the proportional valve 11 and the inlet of the external cooling water 19.

[0028] Specifically, in this embodiment, the refrigeration system achieves adjustable cooling capacity by adjusting the hot gas solenoid valve 6 and the liquid injection valve 7 during the low-temperature PID control. During the high-temperature PID control, the cooling proportional valve 11 controls the cooling water volume, while the heater 4 provides auxiliary heating to control the liquid temperature inside the semi-closed water tank 5. The temperature sensor 12 detects the temperature. The internal circulation pump 26 draws liquid from the semi-closed water tank 5, exchanges heat through the plate evaporator 2, and returns the liquid to the semi-closed water tank 5 via the return pipe. Through circulation, the liquid temperature inside the semi-closed water tank 5 is made uniform, achieving the desired temperature control effect.

[0029] In a preferred embodiment of the present invention, a replenishment tank 21 is also included. The replenishment tank 21 is connected to the inlet and outlet of the water tank 5 through a fifth pipe and a sixth pipe. The replenishment tank 21 is provided with a liquid level pipe 23, a liquid level sensor 24 and a replenishment port 25.

[0030] Specifically, in this embodiment, a semi-enclosed water tank 5 is equipped with a manual / automatic replenishment system 21. The system monitors the liquid level of the replenishment system 21 in real time, provides periodic reminders for replenishment, and automatically vents air from the semi-enclosed water tank 5. The manual / automatic replenishment system 5 is linked to the liquid level pipe 23, triggering an alarm when the liquid level falls below a threshold.

[0031] In a preferred embodiment of this utility model, the plate evaporator 2 is connected to the water tank 5 through a seventh pipe and an eighth pipe. A fourth ball valve 22 is provided on the seventh pipe, and an internal circulation pump 26 and a flow switch 27 are respectively provided on the eighth pipe. The flow switch 27 is located near the plate evaporator 2.

[0032] Specifically, in this embodiment, the internal circulation outlet of the water tank 5 is connected to the inlet of the internal circulation pump 26 by a pipeline, the internal circulation outlet is connected to the internal circulation inlet of the water tank 5 by a pipeline, a flow switch 27 is installed on the outlet pipe of the internal circulation pump 26 to detect the circulation flow, and a temperature sensor 12 is installed in the cavity of the water tank 5 to detect the liquid temperature.

[0033] In a preferred embodiment of this utility model, the plate evaporator 2 and the oil separator 8 are connected by a ninth pipeline and a tenth pipeline. The ninth pipeline is provided with a condenser 28, a dryer filter 29 and a first expansion valve 10 in sequence. The first end of the first expansion valve 10 is connected to the dryer filter 29, the second end of the first expansion valve 10 is connected to the plate evaporator 2, and the third end of the first expansion valve 10 and the third end of the liquid spray expansion valve 9 are respectively connected to the tenth pipeline.

[0034] Specifically, in this embodiment, compressor 1 is connected to plate evaporator 2 via the tenth pipeline.

[0035] In a preferred embodiment of this utility model, an eleventh pipeline is also included. The hot gas solenoid valve 6 is installed on the eleventh pipeline. The eleventh pipeline and the tenth pipeline are connected in parallel and then connected to the pipelines of the plate evaporator 2 and the oil separator 8, respectively.

[0036] In a preferred embodiment of this utility model, the injection valve 7 and the injection expansion valve 9 are connected in series, with one end connected to the compressor 1 and the oil separator 8 pipeline respectively, and the other end connected to the first expansion valve 10.

[0037] Specifically, in Example 2 (low temperature mode), when the target temperature is -40℃, the controller closes the cooling proportional valve 11 and opens the hot gas solenoid valve 6 and the liquid injection valve 7. The refrigerant quickly absorbs heat through the plate evaporator 2. The internal circulation pump 26 drives the refrigerant to circulate between the evaporator and the water tank. The temperature sensor 12 provides real-time feedback, and the PID algorithm dynamically adjusts the liquid injection volume.

[0038] Specifically, in Example 3 (High Temperature Mode), when the target temperature is 180°C, the controller shuts off the refrigeration circuit, opens the cooling proportional valve 11 to inject external cooling water 19, and simultaneously starts the heater 4 to heat the water; the speed of the external circulation pump 17 is increased from 2000 rpm to 5000 rpm in steps, and the flow meter 14 ensures that the flow rate is stable within the set value ±0.1L / min.

[0039] Working Principle: In the operation of this liquid-cooled system, the constant temperature system circulates as follows: Compressor 1 operates, and condenser 28 and fan operate to dissipate heat from compressor 1. The entire refrigeration system comprises a dryer filter 29, a hot gas solenoid valve 6, a first expansion valve 10, a plate evaporator 2, an oil separator 8, a liquid injection expansion valve 9, and a liquid injection valve 7, forming a refrigeration system pipeline. During the low-temperature segment, the hot gas solenoid valve 6 and the liquid injection valve 7 are adjusted and switched to achieve adjustable cooling capacity. During the high-temperature segment, the cooling proportional valve 11 controls the cooling water flow, while the heater 4 provides auxiliary heating to control the liquid temperature inside the semi-closed water tank 5. Temperature sensor 12 detects the temperature. The internal circulation pump 26 draws liquid from the semi-closed water tank 5, exchanges heat through the plate evaporator 2, and returns to the semi-closed water tank 5 via the return pipe. This circulation ensures a uniform liquid temperature inside the semi-closed water tank 5, achieving the desired temperature control.

[0040] The constant flow system operates as follows: the external circulation pump 17 runs, the flow meter 14 detects the flow rate, and the speed of the external circulation pump 17 is adjusted to stabilize the flow rate at the target flow rate within 1 minute.

[0041] In the description of this utility model, it should be noted that the terms "center," "upper," "lower," "left," "right," "vertical," "horizontal," "inner," and "outer," etc., indicating the orientation or positional relationship, are based on the orientation or positional relationship shown in the accompanying drawings and are only for the convenience of describing this utility model and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation, and therefore should not be construed as a limitation of this utility model. Furthermore, the terms "first," "second," and "third" are used for descriptive purposes only and should not be construed as indicating or implying relative importance.

[0042] In the description of this utility model, it should be noted that, unless otherwise explicitly specified and limited, the terms "installation," "connection," and "joining" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; and they can refer to the internal connection of two components. Those skilled in the art can understand the specific meaning of the above terms in this utility model based on the specific circumstances.

[0043] The embodiments of this utility model have been described in detail above with reference to the accompanying drawings, but this utility model is not limited to the described embodiments. For those skilled in the art, various changes, modifications, substitutions, and variations can be made to these embodiments without departing from the principles and spirit of this utility model, and these variations still fall within the protection scope of this utility model.

Claims

1. A high-precision segmented high-low temperature liquid cooling machine, characterized in that, include: The system comprises a composite refrigeration system, a dual-mode temperature control module, and an intelligent control module. The intelligent control module is connected to both the composite refrigeration system and the dual-mode temperature control module. The composite refrigeration system includes a compressor, a plate evaporator, a cooling water coil, and a heater. The plate evaporator and the cooling water coil are integrated into a water tank, which is a semi-enclosed structure. The plate evaporator is connected to the compressor and the water tank via piping to form a closed internal circulation system. The water tank is connected to external equipment via piping to form a closed external circulation constant flow system. The dual-mode temperature control module includes a low-temperature section control module and a high-temperature section control module. The low-temperature section control module includes a hot gas solenoid valve and a spray valve. The system includes a liquid valve, wherein the hot gas solenoid valve is connected to the plate evaporator and oil separator pipelines respectively, and the liquid injection valve and liquid injection expansion valve are connected in series to the oil separator and the first expansion valve respectively. The low-temperature section control module adjusts the cooling capacity through the hot gas solenoid valve and the liquid injection valve. The high-temperature section control module includes the heater and the proportional valve. The high-temperature section control module coordinates the temperature control with the heater through the proportional valve. The intelligent control module includes a temperature sensor, a pressure sensor, and a flow meter. The intelligent control module adjusts the temperature through a PID algorithm, switches to a safety mode and monitors in real time when abnormalities occur.

2. The high-precision segmented high and low temperature liquid chiller according to claim 1, characterized in that, The water tank and the external equipment are configured into a closed external circulation constant flow system through a first pipeline and a second pipeline. The first pipeline is equipped with a first ball valve, and the second pipeline is equipped with an external circulation pump, a second ball valve, a pressure sensor, and a flow meter. The water tank is equipped with a temperature sensor. The pressure sensor is located adjacent to the external circulation pump. The speed control of the external circulation pump adopts a step algorithm. The response time of the external circulation pump is ≤1 minute, and the flow fluctuation is ≤±0.1L / min.

3. The high-precision segmented high and low temperature liquid chiller according to claim 1, characterized in that, The cooling water coil and the heater are arranged alternately in the water tank. The inlet and outlet of the cooling water coil are connected to the external cooling water through the third pipe and the fourth pipe, respectively. The proportional valve is arranged on the third pipe, and a third ball valve is provided between the proportional valve and the inlet of the external cooling water.

4. The high-precision segmented high and low temperature liquid chiller according to claim 1, characterized in that, It also includes a replenishment tank, which is connected to the inlet and outlet of the water tank via a fifth pipe and a sixth pipe. The replenishment tank is equipped with a level pipe, a level sensor and a replenishment port.

5. The high-precision segmented high and low temperature liquid chiller according to claim 2, characterized in that, The plate evaporator is connected to the water tank through a seventh pipe and an eighth pipe. A fourth ball valve is provided on the seventh pipe, and an internal circulation pump and a flow switch are provided on the eighth pipe. The flow switch is located adjacent to the plate evaporator.

6. The high-precision segmented high and low temperature liquid chiller according to claim 2, characterized in that, The plate evaporator and the oil separator are connected by a ninth pipeline and a tenth pipeline. The ninth pipeline is provided with a condenser, a dryer filter and the first expansion valve in sequence. The first end of the first expansion valve is connected to the dryer filter, the second end of the first expansion valve is connected to the plate evaporator, and the third end of the first expansion valve and the third end of the liquid injection expansion valve are respectively connected to the tenth pipeline.

7. The high-precision segmented high and low temperature liquid chiller according to claim 6, characterized in that, It also includes an eleventh pipeline, on which the hot gas solenoid valve is installed. The eleventh pipeline is connected in parallel with the tenth pipeline and is respectively connected to the plate evaporator and the oil separator pipeline.

8. The high-precision segmented high and low temperature liquid chiller according to claim 1, characterized in that, The injection valve and the injection expansion valve are connected in series. One end of each valve is connected to the compressor and the oil separator pipeline, and the other end is connected to the first expansion valve.

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