Low-flow large-temperature-difference constant-temperature oil cooling machine

Abstract

This utility model relates to a low-flow-rate, large-temperature-difference constant-temperature oil cooler, comprising an evaporator, an oil circuit, and a cooling medium circuit. The oil circuit includes an oil inlet, an oil supply pump, an evaporator oil side, and an oil outlet connected sequentially via pipes. The cooling medium circuit includes a compressor, a condenser, a throttling electronic expansion valve, and an evaporator cooling medium side connected sequentially via pipes. The condenser is an air-cooled condenser. The low-flow-rate, large-temperature-difference constant-temperature oil cooler also includes a bypass electronic expansion valve. This utility model adopts a non-stop control method. The controller controls the opening of the throttling electronic expansion valve based on the oil temperature detected by the first temperature sensor, and simultaneously adjusts the opening of the bypass electronic expansion valve, thereby controlling the flow rate of the cooling medium flowing out of the condenser, thus maintaining a constant oil outlet temperature. It can meet the requirement of providing a constant-temperature oil with an oil outlet temperature of 15±0.5℃ when the oil inlet temperature is 40℃. The system structure is simple and the equipment cost is low.

Description

Technical Field

[0001] This utility model relates to the field of cooling machine technology, and in particular to a low-flow-rate, large-temperature-difference constant-temperature oil cooler. Background Technology

[0002] Normally, the temperature difference between the inlet and outlet of an oil cooler is 8-10℃. Under special operating conditions, the temperature difference can reach 25℃, which is extremely large and results in a very small oil flow rate.

[0003] Meanwhile, since the outlet oil temperature is required to be constant at 15±0.5℃, the temperature difference control method cannot be used for the cooler. Because if the temperature difference control method is used, the cooler will stop immediately once the oil temperature reaches the target temperature. Since the compressor has a strict rule that it can only be restarted 3 minutes after stopping, the oil temperature will rise immediately during this period, making it impossible to meet the temperature control requirements.

[0004] To meet the demand for supplying low-flow, high-temperature-difference constant-temperature oil, a chiller unit is typically used to produce chilled water at a certain temperature. This chilled water is then pumped to an oil-water heat exchanger for heat exchange. The temperature controller adjusts the electric three-way proportional valve in the water circuit based on the collected evaporator outlet oil temperature, thereby regulating the amount of cooling water entering the heat exchanger and ultimately controlling the outlet oil temperature. However, this system is complex and has high equipment costs.

[0005] It should be noted that the information disclosed in the background section above is only used to enhance the understanding of the background of this disclosure, and therefore may include information that does not constitute prior art known to those skilled in the art. Utility Model Content

[0006] To address the shortcomings of existing technologies, this utility model discloses a low-flow-rate, high-temperature-difference constant-temperature oil cooler to solve the problems of complex cooling system structure and high equipment cost.

[0007] The technical solution adopted in this utility model is as follows: A low-flow-rate, high-temperature-difference constant-temperature oil cooler includes an evaporator, an oil circuit, and a cooling medium circuit. The oil circuit is an open circuit, including an oil inlet, an oil supply pump, an evaporator oil side, and an oil outlet connected sequentially by pipes. The cooling medium circuit is a closed circuit, including a compressor, a condenser, a throttling electronic expansion valve, and an evaporator cooling medium side connected sequentially by pipes. The condenser is an air-cooled condenser. The low-flow-rate, high-temperature-difference constant-temperature oil cooler also includes a bypass electronic expansion valve. The first end of the bypass electronic expansion valve is connected to the pipe between the compressor and the condenser, and the second end of the bypass electronic expansion valve is connected to the pipe between the throttling electronic expansion valve and the evaporator cooling medium side. The low-flow-rate, high-temperature-difference constant-temperature oil cooler also includes: a first temperature sensor, which is installed at the oil outlet to detect the oil temperature at the oil outlet.

[0008] A further technical solution is that the low-flow, large-temperature-difference constant-temperature oil cooler includes: a second temperature sensor, located at the inlet of the evaporator cooling medium side, to detect the temperature of the cooling medium at the inlet of the evaporator cooling medium side; and a third temperature sensor, located at the outlet of the evaporator cooling medium side, to detect the temperature of the cooling medium at the outlet of the evaporator cooling medium side.

[0009] A further technical solution is that the low-flow, large-temperature-difference constant-temperature oil cooler includes: a low-pressure controller, which is installed on the pipeline between the evaporator cooling medium side and the compressor; and a high-pressure controller, which is installed on the pipeline between the compressor and the condenser.

[0010] A further technical solution is that the low-flow, large-temperature-difference constant-temperature oil cooler includes: a condenser pressure controller, which is installed on the pipeline between the high-pressure pressure controller and the condenser.

[0011] A further technical solution is that the low-flow, large-temperature-difference constant-temperature oil cooler includes: a dryer filter, which is installed on the pipeline between the condenser and the throttling electronic expansion valve.

[0012] A further technical solution is that the low-flow, large-temperature-difference constant-temperature oil cooler includes: a first liquid filling valve, which is installed on the pipeline between the low-pressure controller and the compressor; and a second liquid filling valve, which is installed on the pipeline between the condenser and the dryer filter.

[0013] A further technical solution is that the low-flow, large-temperature-difference constant-temperature oil cooler also includes a controller, which is electrically connected to the first temperature sensor, the second temperature sensor, the third temperature sensor, the throttling electronic expansion valve, and the bypass electronic expansion valve.

[0014] A further technical solution is that the oil inlet temperature is 40℃, the oil outlet temperature is 15±0.5℃, and the heat exchange area of ​​the evaporator is adjusted according to the oil inlet temperature and the oil outlet temperature.

[0015] The beneficial effects of this utility model embodiment are as follows: (I) The low-flow, large-temperature-difference constant-temperature oil cooler of this utility model adopts a non-stop control method. It controls the opening of the throttling electronic expansion valve according to the oil temperature at the oil outlet, and simultaneously adjusts the opening of the bypass electronic expansion valve, thereby controlling the flow rate of the cooling medium flowing out of the condenser, thus maintaining a constant oil outlet temperature. It can meet the requirement of providing constant-temperature oil with an oil outlet temperature of 15±0.5℃ when the oil inlet temperature is 40℃. The system has a simple structure and low equipment cost.

[0016] (ii) Furthermore, a second temperature sensor is installed at the inlet of the evaporator cooling medium side to detect the temperature of the cooling medium at the evaporator cooling medium inlet. A third temperature sensor is installed at the outlet of the evaporator cooling medium side to detect the temperature of the cooling medium at the evaporator cooling medium outlet. By detecting the cooling medium temperatures at the evaporator cooling medium inlet and outlet, the superheat of the refrigeration system is determined, and the throttling electronic expansion valve and bypass electronic expansion valve are fine-tuned to improve the control accuracy of the refrigeration system. Attached Figure Description

[0017] Figure 1 This is a schematic diagram of the structure of the low-flow-rate, large-temperature-difference constant-temperature oil cooler of this utility model.

[0018] Figure 2 This is a connection diagram of the low-flow, high-temperature-difference constant-temperature oil cooler of this utility model.

[0019] In the picture: 1. Compressor; 11. Low-pressure regulator; 12. High-pressure regulator; 2. Condenser; 21. Condensing regulator; 3. Throttling electronic expansion valve; 4. Evaporator; 41. Second temperature sensor; 42. Third temperature sensor; 5. Bypass electronic expansion valve; 6. Oil inlet; 61. Oil supply pump; 7. Oil outlet; 71. First temperature sensor; 8. Dryer filter; 91. First filling valve; 92. Second filling valve; 10. Controller. Detailed Implementation

[0020] To further illustrate the technical means and effects adopted by this utility model in order to achieve the intended utility model purpose, the following detailed description of the specific implementation methods, structure, features and effects of this utility model is provided in conjunction with the accompanying drawings and preferred embodiments.

[0021] Example: This embodiment discloses a low-flow-rate, high-temperature-difference constant-temperature oil cooler.

[0022] The low-flow, high-temperature-difference constant-temperature oil cooler includes an evaporator, an oil circuit, and a cooling medium circuit.

[0023] The oil circuit is an open loop, including an oil inlet 6, an oil supply pump 61, an oil side of an evaporator 4, and an oil outlet 7, which are connected in sequence through pipes.

[0024] The cooling medium circuit is a closed circuit, including the compressor 1, condenser 2, throttling electronic expansion valve 3 and evaporator 4 connected in sequence by pipes on the cooling medium side. The condenser 2 is an air-cooled condenser 2.

[0025] The low-flow, high-temperature-difference constant-temperature oil cooler also includes a bypass electronic expansion valve 5. The first end of the bypass electronic expansion valve 5 is connected to the pipeline between the compressor 1 and the condenser 2, and the second end of the bypass electronic expansion valve 5 is connected to the pipeline between the throttling electronic expansion valve 3 and the cooling medium side of the evaporator 4.

[0026] like Figure 1 As shown, the low-flow-rate, high-temperature-difference constant-temperature oil cooler further includes a first temperature sensor 71, which is located at the oil outlet 7 to detect the oil temperature at the oil outlet 7.

[0027] like Figure 1 As shown, the low-flow, high-temperature-difference constant-temperature oil cooler further includes a second temperature sensor 41 and a third temperature sensor 42. The second temperature sensor 41 is located at the inlet of the evaporator 4 on the cooling medium side, detecting the temperature of the cooling medium at the inlet of the evaporator 4. The third temperature sensor 42 is located at the outlet of the evaporator 4 on the cooling medium side, detecting the temperature of the cooling medium at the outlet of the evaporator 4. By detecting the cooling medium temperatures at the inlet and outlet of the evaporator 4, the superheat of the refrigeration system is determined, and the throttling electronic expansion valve 3 and the bypass electronic expansion valve 5 are fine-tuned to improve the control accuracy of the refrigeration system.

[0028] like Figure 1 As shown, the low-flow, high-temperature-difference constant-temperature oil cooler further includes a low-pressure controller 11 and a high-pressure controller 12. The low-pressure controller 11 is located on the pipeline between the evaporator 4 (cooling medium side) and the compressor 1. When the low-pressure controller 11 detects that the pressure in the pipeline is lower than a set value, it automatically cuts off the power supply to the compressor 1. The high-pressure controller 12 is located on the pipeline between the compressor 1 and the condenser 2. When the high-pressure controller 12 detects that the pressure in the pipeline is higher than a set value, it automatically cuts off the power supply to the compressor 1 to protect it and extend the cooler's service life.

[0029] like Figure 1 As shown, the low-flow, high-temperature-difference constant-temperature oil cooler further includes a condenser pressure controller 21. The condenser pressure controller 21 is installed on the pipeline between the high-pressure controller 12 and the condenser 2, controlling the speed of the fan in the condenser 2 to prevent the compressor 1 from overheating or the system from malfunctioning due to excessively high condensing pressure, thereby balancing heat dissipation efficiency and cooler reliability.

[0030] like Figure 1 As shown, the low-flow, high-temperature-difference constant-temperature oil cooler further includes a dryer filter 8. The dryer filter 8 is installed on the pipeline between the condenser 2 and the throttling electronic expansion valve 3 to absorb moisture in the cooling medium, preventing moisture from freezing in the pipeline and corroding components in the system.

[0031] like Figure 1As shown, the low-flow, high-temperature-difference constant-temperature oil cooler further includes a first filling valve 91 and a second filling valve 92. The first filling valve 91 is located on the pipeline between the low-pressure controller 11 and the compressor 1, and the second filling valve 92 is located on the pipeline between the condenser 2 and the dryer filter 8. Cooling medium is replenished to the cooling medium circuit through the first filling valve 91 and the second filling valve 92.

[0032] like Figure 1 As shown, the oil inlet temperature at oil inlet 6 is 40℃, and the oil outlet temperature at oil outlet 7 is 15±0.5℃. The heat exchange area of ​​evaporator 4 is adjusted according to the oil inlet temperature at oil inlet 5 and the oil outlet temperature at oil outlet 7. Specifically, the heat exchange area of ​​evaporator 4 is increased, for example, by increasing the number of parallel coil groups, using smaller pipe diameters, and using finned tubes, thereby increasing the heat absorbed by evaporator 4 to maintain the oil temperature at oil outlet 7.

[0033] like Figure 2 As shown, the low-flow, high-temperature-difference constant-temperature oil cooler further includes a controller 10, which is electrically connected to a first temperature sensor 71, a second temperature sensor 41, a third temperature sensor 42, a throttling electronic expansion valve 3, and a bypass electronic expansion valve 5. In this application, electrical connection refers to the connection between different components in a circuit via physical lines capable of transmitting electrical signals, such as PCB copper foil or wires. The controller 10 receives the oil inlet temperature of the evaporator 4 detected by the first temperature sensor 71, the oil outlet temperature of the evaporator 4 detected by the second temperature sensor 41, and the oil outlet temperature of the oil outlet 7 detected by the third temperature sensor 42, and controls the opening degree of the throttling electronic expansion valve 3 and the bypass electronic expansion valve 5. The controller 10 can be a commercially available PLC controller, and the control program is existing technology.

[0034] In this embodiment, the low-flow, large-temperature-difference constant-temperature oil cooler of this application adopts a non-stop control method. The controller 10 controls the opening of the throttling electronic expansion valve 3 based on the oil temperature detected by the first temperature sensor 71 at the oil outlet 7, and simultaneously adjusts the opening of the bypass electronic expansion valve 5, thereby controlling the flow rate of the cooling medium flowing out of the condenser 2, thus maintaining a constant oil outlet temperature. It can meet the requirement of providing a constant-temperature oil with an oil outlet temperature of 15±0.5℃ at the oil inlet 6 when the oil inlet temperature is 40℃. The system has a simple structure and low equipment cost.

[0035] The above description is merely a preferred embodiment of the present utility model and is not intended to limit the present utility model in any way. Although the present utility model has been disclosed above with reference to a preferred embodiment, it is not intended to limit the present utility model. Any person skilled in the art can make some modifications or alterations to the above-disclosed technical content to create equivalent embodiments without departing from the scope of the present utility model. Any simple modifications, equivalent changes and alterations made to the above embodiments based on the technical essence of the present utility model without departing from the scope of the present utility model shall still fall within the scope of the present utility model.

Claims

1. A low-flow-rate, high-temperature-difference constant-temperature oil cooler, characterized in that, The low-flow, large-temperature-difference constant-temperature oil cooler includes an evaporator, an oil circuit, and a cooling medium circuit. The oil circuit is an open circuit, including an oil inlet, an oil supply pump, an evaporator oil side, and an oil outlet connected in sequence via pipes. The cooling medium circuit is a closed circuit, including a compressor, a condenser, a throttling electronic expansion valve, and an evaporator cooling medium side connected in sequence via pipes. The condenser is an air-cooled condenser. The low-flow, large-temperature-difference constant-temperature oil cooler also includes a bypass electronic expansion valve. The first end of the bypass electronic expansion valve is connected to the pipe between the compressor and the condenser, and the second end of the bypass electronic expansion valve is connected to the pipe between the throttling electronic expansion valve and the evaporator cooling medium side. The low-flow, large-temperature-difference constant-temperature oil cooler also includes: A first temperature sensor is installed at the oil outlet to detect the oil temperature at the oil outlet.

2. The low-flow-rate, large-temperature-difference constant-temperature oil cooler according to claim 1, characterized in that, The low-flow, large-temperature-difference constant-temperature oil cooler includes: The second temperature sensor is installed at the inlet of the evaporator cooling medium side to detect the temperature of the cooling medium at the inlet of the evaporator cooling medium side. A third temperature sensor is installed at the outlet of the evaporator on the cooling medium side to detect the temperature of the cooling medium at the outlet of the evaporator on the cooling medium side.

3. The low-flow-rate, large-temperature-difference constant-temperature oil cooler according to claim 1, characterized in that, The low-flow, large-temperature-difference constant-temperature oil cooler includes: A low-pressure regulator is installed on the pipeline between the evaporator cooling medium side and the compressor; A high-pressure regulator is installed on the pipeline between the compressor and the condenser.

4. The low-flow-rate, large-temperature-difference constant-temperature oil cooler according to claim 3, characterized in that, The low-flow, large-temperature-difference constant-temperature oil cooler includes: A condensing pressure controller is installed on the pipeline between the high-pressure pressure controller and the condenser.

5. The low-flow-rate, large-temperature-difference constant-temperature oil cooler according to claim 4, characterized in that, The low-flow, large-temperature-difference constant-temperature oil cooler includes: A drying filter is installed on the pipeline between the condenser and the throttling electronic expansion valve.

6. The low-flow-rate, large-temperature-difference constant-temperature oil cooler according to claim 5, characterized in that, The low-flow, large-temperature-difference constant-temperature oil cooler includes: The first liquid filling valve is installed on the pipeline between the low-pressure controller and the compressor; The second liquid filling valve is installed on the pipeline between the condenser and the dryer filter.

7. The low-flow-rate, large-temperature-difference constant-temperature oil cooler according to claim 2, characterized in that: The low-flow, high-temperature-difference constant-temperature oil cooler also includes a controller, which is electrically connected to the first temperature sensor, the second temperature sensor, the third temperature sensor, the throttling electronic expansion valve, and the bypass electronic expansion valve.

8. The low-flow-rate, large-temperature-difference constant-temperature oil cooler according to claim 1, characterized in that: The oil inlet temperature is 40℃, the oil outlet temperature is 15±0.5℃, and the heat exchange area of ​​the evaporator is adjusted according to the oil inlet temperature and the oil outlet temperature.

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