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A high-precision oil cooler and its control method

A control method and oil cooling technology, applied in refrigerators, cooling fluid circulation devices, compressors, etc., can solve the problems of insufficient energy saving and high power consumption, and achieve simplified linkage control, improved temperature control response speed, and continuous high precision The effect of energy saving control

Active Publication Date: 2021-06-18
GREE ELECTRIC APPLIANCES INC
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] The control device of the above-mentioned mechanical cooling system and the liquid cooling temperature control device are all controlled by the fixed-frequency compressor and the bypass flow regulating valve. During this process, the fixed-frequency compressor has been running at a fixed frequency, and the power consumption is large , although the temperature control can be achieved through the bypass flow regulating valve, but it is not energy-saving enough

Method used

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  • A high-precision oil cooler and its control method
  • A high-precision oil cooler and its control method
  • A high-precision oil cooler and its control method

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0071] see Figure 1-Figure 2 , the high-precision oil cooler of the present invention includes a refrigeration system and a circulating oil circuit system, wherein,

[0072] The refrigeration system includes a main flow system and a side branch flow system, wherein,

[0073] The main flow system includes an inverter compressor 1, a condenser 2, a fan 3, a filter 4, an electronic expansion valve 5, and an evaporator 6, wherein the suction end of the inverter compressor 1 is connected to the evaporator 6 The outlet port is connected, and the exhaust port is connected with the inlet port of the condenser 2; the fan 3 is arranged on the condenser 2, and the outlet port of the condenser 2 is connected with the inlet port of the filter 4; The outlet end of the filter 4 communicates with the inlet end of the electronic expansion valve 5, and the outlet end of the electronic expansion valve 5 communicates with the inlet end of the evaporator 6;

[0074] The bypass flow system inclu...

Embodiment 2

[0116] see image 3 The difference between this embodiment and Embodiment 1 is that the control method of the high-precision oil cooler of the present invention is applied in the inlet oil temperature control mode, the frequency control of the inverter compressor 1 and the opening of the bypass flow regulating valve 8 Degree control is carried out according to the following steps (for details, see image 3 ):

[0117] (T1) The oil pump 13 is turned on, and the inlet oil temperature T is detected -进口 , set the inlet oil temperature T _set-进口 , when the inlet oil temperature reaches the set target temperature, namely T -进口 =T _set-进口 ; then keep the current state;

[0118] (T2) When the inlet oil temperature is lower than the set target temperature, that is, T -进口 _set-进口 ; If the variable frequency compressor 1 is not turned on, keep the current state;

[0119] (T3) When the inlet oil temperature is lower than the set target temperature, that is, T -进口 _set-进口 ;

[012...

Embodiment 3

[0128] The difference between this embodiment and Embodiment 1 is that in step (4) of the control method of the high-precision oil cooler of the present invention, the maximum opening degree E of the bypass flow regulating valve 8 is fully opened max (that is, 500B) is used as the variable frequency compressor 1 frequency 0Hz control, and 0B when the bypass flow regulating valve 8 is fully closed is used as F min (i.e. 20HZ) control; set E max (i.e. 500B) According to the flow curve of the bypass flow regulating valve 8, the opening is determined according to the equal flow rate; 0-E max Among other opening parameters with inverter compressor 1F min The frequency parameters between -0Hz correspond in turn; as shown in the following table:

[0129]

[0130] The remaining steps are completed with reference to Example 1.

[0131] This embodiment aims at bypassing the flow regulating valve 8 with a non-linear flow curve, so that its change is close to linear, which is more c...

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Abstract

The invention discloses a high-precision oil cooler and a control method, wherein the high-precision oil cooler includes a refrigeration system and a circulating oil system, and the refrigeration system includes a main flow system and a side branch flow system; The circuit system includes a frequency conversion compressor, a condenser, a fan, an electronic expansion valve, and an evaporator connected in sequence; the fan is arranged on the condenser; the bypass flow system includes a bypass flow regulating valve, and the bypass flow The regulating valve is arranged in parallel with the condenser and the electronic expansion valve; the circulating oil circuit system includes an oil tank and an oil pump; the oil inlet of the oil tank communicates with the oil outlet of the machine tool, and the oil outlet of the oil tank communicates with the inlet of the oil pump The oil port is connected, the oil outlet of the oil pump is connected with the oil inlet of the evaporator, and the oil outlet of the evaporator is connected with the oil inlet of the machine tool. The high-precision oil cooler of the present invention can not only realize precise temperature control, but also save energy.

Description

technical field [0001] The invention relates to an oil cooler, in particular to a high-precision oil cooler and a control method. Background technique [0002] The oil cooler uses the principle of evaporation and heat absorption of the refrigerant to carry out cooling work. The oil pump extracts the oil from the oil storage tank of the machine tool to the refrigeration system for heat exchange treatment, and the cooled hydraulic oil returns to the machine tool storage through the oil outlet pipeline of the oil cooler. in the fuel tank. [0003] Existing oil coolers generally use a fixed-frequency compressor with a bypass flow regulating valve to unload excess cooling capacity, so as to achieve the purpose of precise temperature control. For example, the patent No. ZL02294103.7 announced a "control device for mechanical cooling system" , and the utility model patent No. ZL200820088306.7 discloses "a liquid cooling temperature control device", the above-mentioned mechanical c...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): F25B1/00F25B41/20F25B49/02F25D17/02
CPCF25B1/00F25B49/02F25D17/02F25B41/20
Inventor 毕增利赵成寅杨爱玲陈桂福
Owner GREE ELECTRIC APPLIANCES INC
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