Filter type oil cooler system based on cold and hot oil duct separation and double-temperature-sensing control

Abstract

The invention provides a filter type oil cooler system based on cold and hot oil duct separation and double temperature sensing control, and relates to the technical field of oil cooling, the filter type oil cooler system comprises an oil cooler and a circulating oil tank, the oil cooler is provided with a cold oil outlet and a hot oil inlet, and an auxiliary temperature sensing bulb used for measuring the oil temperature is arranged at the cold oil outlet; the circulating oil tank is arranged close to the oil cooling equipment, the circulating oil tank is provided with an upper oil duct and a lower oil duct, the upper oil duct and the lower oil duct both have an oil storage function, and the two ends of the upper oil duct are communicated with the cold oil outlet and the cold oil inlet through a cold oil outlet pipeline and a cold oil inlet pipeline respectively; two ends of the lower oil duct are respectively communicated with the hot oil inlet and the hot oil outlet through a hot oil outlet pipeline and a hot oil inlet pipeline; a main temperature sensing bulb used for measuring the oil temperature is further arranged at the connecting position of the cold oil inlet pipeline and the circulating oil tank. According to the oil cooling device, the accuracy of oil liquid adjustment can be improved, the cooling effect on oil cooling equipment is guaranteed, and safe and stable operation of the oil cooling machine is guaranteed.

Description

Technical Field

[0001] The present invention relates to the technical field of oil cooling, and in particular to a filter-type oil cooling system based on hot and cold oil channel separation and dual temperature sensing control. Background Art

[0002] Many mechanical equipment require oil cooling during operation, such as motors and machine tools. The temperature of the oil will rise after heat exchange with the equipment. Therefore, the oil needs to be cooled to achieve oil recycling. An oil cooler is a device that cools the oil.

[0003] The current temperature control technology of oil coolers is not mature enough, and the oil temperature control deviation is large, which cannot meet the needs of precision processing mechanical equipment. Summary of the Invention

[0004] The purpose of the present invention is to provide a filter-type oil cooler system based on hot and cold oil channel separation and dual temperature sensing control to solve the problems existing in the above-mentioned prior art, improve the accuracy of oil regulation, ensure the cooling effect of the oil cooling equipment and ensure the safe and stable operation of the oil cooler.

[0005] To achieve the above object, the present invention provides the following solutions:

[0006] A filter-type oil cooler system based on hot and cold oil channel separation and dual temperature sensing control is used to cool the oil cooling equipment, the oil cooling equipment has a hot oil outlet and a cold oil inlet; the filter-type oil cooler system based on hot and cold oil channel separation and dual temperature sensing control includes an oil cooler and a circulating oil tank, the oil cooler has a cold oil outlet and a hot oil inlet, the cold oil outlet is provided with an auxiliary temperature sensing package for measuring the oil temperature; the circulating oil tank is arranged close to the oil cooling equipment, ... The circular oil tank has an upper oil channel and a lower oil channel, both of which have oil storage functions. The two ends of the upper oil channel are connected to the cold oil outlet and the cold oil inlet through a cold oil outlet pipeline and a cold oil inlet pipeline respectively, and the two ends of the lower oil channel are connected to the hot oil inlet and the hot oil outlet through a hot oil outlet pipeline and a hot oil inlet pipeline respectively; a main temperature sensing package for measuring oil temperature is also provided at the connection position between the cold oil inlet pipeline and the circulating oil tank.

[0007] As an embodiment, a filter for filtering impurities in the oil is further provided at the connection position between the hot oil inlet pipeline and the circulating oil tank.

[0008] As an embodiment, an oil pump is further provided on the cold oil inlet pipeline between the main temperature sensing package and the oil cooling device.

[0009] As an embodiment, the cold oil outlet pipeline, the cold oil inlet pipeline, the hot oil outlet pipeline and the hot oil inlet pipeline are all provided with a shut-off valve and a pressure sensor for measuring oil pressure.

[0010] As one embodiment, the oil cooler includes a cooling medium circulation component, which includes a compressor, a condenser, a throttle valve and an evaporator connected in sequence by pipelines, the hot oil inlet and the cold oil outlet are both connected to the evaporator, and the cooling medium circulation component also includes a fan arranged at the condenser.

[0011] As one embodiment, the condenser is a copper tube fin radiator.

[0012] As one embodiment, the evaporator is a brazed plate heat exchanger.

[0013] As one embodiment, the fan is a DC variable frequency fan.

[0014] The present invention also provides a control method for a filter-type oil cooler system based on separation of hot and cold oil channels and dual temperature-sensing control, comprising the following steps: a main temperature-sensing package and an auxiliary temperature-sensing package are both communicatively connected to a PLC control module; when the exhaust pressure of the compressor in the oil cooler does not exceed a set value, the filter-type oil cooler system based on separation of hot and cold oil channels and dual temperature-sensing control is controlled based on the oil temperature measured by the main temperature-sensing package; when the oil temperature exceeds the set value, the operating frequency of the compressor and the operating frequency of the fan are increased; when the operating frequency of the compressor reaches the set value, the operating frequency of the compressor is reduced, and only the operating frequency of the fan is increased; when the working pressure of the compressor in the oil cooler exceeds a set value, the filter-type oil cooler system based on separation of hot and cold oil channels and dual temperature-sensing control is controlled based on the oil temperature measured by the auxiliary temperature-sensing package; the operating frequency of the compressor is reduced, and only the operating frequency of the fan is increased.

[0015] As an embodiment, when the temperature measured by the main temperature sensor does not exceed the set value and the operating frequency of the compressor does not exceed the set value, the current operating frequencies of the compressor and the fan are maintained.

[0016] Compared with the prior art, the present invention has the following technical effects:

[0017] 1. The present invention provides a circulating oil tank between the oil cooling device and the oil cooler to temporarily store cold oil and hot oil. This facilitates adjustment of the oil circulation speed and allows impurities in the hot oil flowing out of the oil cooling device to settle in the second oil channel, thereby reducing the filtration pressure of the filter in the oil circuit and reducing the number of filter cleaning times.

[0018] 2. In the present invention, the circulating oil tank is arranged close to the oil cooling equipment, and a main temperature sensing package is arranged at the cold oil outlet of the circulating oil tank, which can more accurately monitor the oil entering the oil cooling equipment. When the working efficiency of the oil cooler is regulated based on the oil temperature measured by the main temperature sensing package, the accuracy of oil regulation can be improved, thereby ensuring the cooling effect of the oil cooling equipment.

[0019] 3. In the present invention, an auxiliary temperature-sensing package is provided at the cold oil outlet of the oil cooler. The auxiliary temperature-sensing package and the main temperature-sensing package cooperate to measure temperature. When the current working condition of the oil cooler cannot meet the temperature requirement at the cold oil outlet of the circulating oil tank, this situation is usually when the exhaust temperature of the oil cooler exceeds the rated pressure. The working efficiency of the oil cooler is regulated based on the measured temperature of the auxiliary temperature-sensing package to reduce the operating pressure of the compressor and ensure the safe and stable operation of the equipment. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the following briefly introduces the drawings required for use in the embodiments. Obviously, the drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying any creative work.

[0021] Figure 1 A schematic structural diagram of a filter-type oil cooler system based on hot and cold oil channel separation and dual temperature sensing control in one embodiment of the present invention;

[0022] Figure 2 A schematic structural diagram of a cooling system in an oil cooler according to an embodiment of the present invention;

[0023] Figure 3 The schematic diagram is a control method for a filter-type oil cooler system based on hot and cold oil channel separation and dual temperature sensing control in one embodiment of the present invention.

[0024] Description of reference numerals:

[0025] 1. Oil cooling equipment; 2. Oil cooler; 3. Circulating oil tank; 4. Auxiliary temperature sensor; 5. Main temperature sensor; 6. Filter; 7. Oil pump; 8. Shut-off valve; 9. Compressor; 10. Condenser; 11. Throttle valve; 12. Evaporator; 13. Fan. DETAILED DESCRIPTION

[0026] The following will clearly and completely describe the technical solutions in the embodiments of the present invention in conjunction with the accompanying drawings. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without making creative efforts are within the scope of protection of the present invention.

[0027] The purpose of the present invention is to provide a filter-type oil cooler system based on hot and cold oil channel separation and dual temperature sensing control to solve the problems existing in the prior art, improve the accuracy of oil regulation, ensure the cooling effect of the oil cooling equipment and ensure the safe and stable operation of the oil cooler.

[0028] In order to make the above-mentioned objects, features and advantages of the present invention more obvious and easy to understand, the present invention is further described in detail below with reference to the accompanying drawings and specific embodiments.

[0029] Example 1:

[0030] like Figures 1 to 3 As shown, this embodiment provides a filter-type oil cooler system based on hot and cold oil channel separation and dual temperature sensing control, which is used to cool the oil cooling device 1. The oil cooling device 1 has a hot oil outlet and a cold oil inlet. The oil cooling device 1 can be any equipment that requires oil cooling, such as a machine tool, a motor, etc. The filtering oil cooler system based on separation of cold and hot oil channels and dual temperature sensing control includes an oil cooler 2 and a circulating oil tank 3. The oil cooler 2 has a cold oil outlet and a hot oil inlet. An auxiliary temperature sensing package 4 for measuring the oil temperature is provided at the cold oil outlet; the circulating oil tank 3 is arranged close to the oil cooling equipment 1. The circulating oil tank 3 has an upper oil channel and a lower oil channel. Both the upper oil channel and the lower oil channel have a certain oil storage space, which can store cold oil and hot oil. The two ends of the upper oil channel are connected to the cold oil outlet and the cold oil inlet through the cold oil outlet pipeline and the cold oil inlet pipeline respectively, and the two ends of the lower oil channel are connected to the hot oil inlet and the hot oil outlet respectively through the hot oil outlet pipeline and the hot oil inlet pipeline respectively; a main temperature sensing package 5 for measuring the oil temperature is also provided at the connection position between the cold oil inlet pipeline and the circulating oil tank 3 (that is, the cold oil outlet of the circulating oil tank 3).

[0031] Conventional oil circulation circuits do not include a circulating oil tank 3. This can lead to unstable oil supply when adjusting the oil circulation speed. Furthermore, the hot oil flowing out of the oil cooling device 1 contains impurities, and filtering solely through the filter 6 can easily cause the filter 6 to clog, resulting in reduced oil pressure. This embodiment, by providing a circulating oil tank 3 between the oil cooling device 1 and the oil cooler 2, allows for temporary storage of both cold and hot oil. This facilitates adjustment of the oil circulation speed and allows impurities in the hot oil flowing out of the oil cooling device 1 to settle in the second oil passage, reducing the filtration pressure of the filter 6 in the oil circuit and the number of times the filter 6 needs to be cleaned. The circulating oil tank 3 in this embodiment can include an oil tank body and a heat shield disposed in the middle of the oil tank body. The oil tank body is also made of a heat-insulating material to prevent heat exchange between the cold and hot oils in the circulating oil tank 3 and heat exchange between the cold oil and the external environment, which would otherwise reduce the cooling efficiency of the cold oil.

[0032] In addition, conventional oil coolers 2 typically only have a temperature sensor installed at the cold oil outlet to monitor the oil temperature and control the operating efficiency of the oil cooler 2. However, the pipeline between the oil cooler 2 and the oil cooling device 1 is long, and the cold oil exchanges heat with the external environment during transportation in the pipeline, causing the cold oil to heat up, resulting in a decrease in the cooling effect on the oil cooling device 1. In this embodiment, the circulating oil tank 3 is located near the oil cooling device 1, and a main temperature sensor 5 is installed at the cold oil outlet of the circulating oil tank 3. This allows for more accurate monitoring of the oil entering the oil cooling device 1. When the operating efficiency of the oil cooler 2 is adjusted based on the oil temperature measured by the main temperature sensor 5, the accuracy of oil regulation can be improved, thereby ensuring the cooling effect on the oil cooling device 1.

[0033] At the same time, in this embodiment, an auxiliary temperature sensing package 4 is provided at the cold oil outlet of the oil cooler 2. The auxiliary temperature sensing package 4 cooperates with the main temperature sensing package 5 to measure temperature. When the current working condition of the oil cooler 2 cannot meet the temperature requirement at the cold oil outlet of the circulating oil tank 3, this situation is usually when the exhaust temperature of the oil cooler 2 exceeds the rated pressure. The working efficiency of the oil cooler 2 is regulated based on the measured temperature of the auxiliary temperature sensing package 4 to reduce the operating pressure of the compressor 9 to ensure the safe and stable operation of the equipment.

[0034] In this embodiment, a filter 6 for filtering impurities in the oil is further provided at the connection position between the hot oil inlet pipeline and the circulating oil tank 3 .

[0035] In this embodiment, an oil pump 7 is further provided on the cooling oil inlet pipeline between the main temperature sensing package 5 and the oil cooling device 1 , and the oil pump 7 is used to provide circulation power for the oil.

[0036] In this embodiment, the cold oil outlet pipeline, the cold oil inlet pipeline, the hot oil outlet pipeline and the hot oil inlet pipeline are all provided with a shut-off valve 8 and a pressure sensor for measuring the oil pressure; the shut-off valve 8 is used to control the on-off of each oil circuit, and the pressure sensor is used to monitor the pressure in each oil circuit and determine whether there is leakage or blockage in the oil circuit.

[0037] In this embodiment, the oil cooler 2 includes a cooling medium circulation assembly, which comprises a compressor 9, a condenser 10, a throttle valve 11, and an evaporator 12, interconnected in sequence by pipelines. The hot oil inlet and cold oil outlet are both connected to the evaporator 12. The cooling medium circulation assembly also includes a fan 13 disposed at the condenser 10. In this embodiment, the condenser 10 is a copper tube fin radiator. In this embodiment, the evaporator 12 is a brazed plate heat exchanger. Both copper tube fin radiators and brazed plate heat exchangers are commonly used in the art, and their specific structures are not described in detail in this embodiment.

[0038] In this embodiment, the fan 13 is a DC variable frequency fan 13, which can change its operating frequency.

[0039] Example 2:

[0040] like Figure 3 As shown, this embodiment provides a control method for a filter-type oil cooler system based on separation of hot and cold oil channels and dual temperature-sensing control, comprising the following steps: the main temperature-sensing package 5 and the auxiliary temperature-sensing package are both communicatively connected to the PLC control module; when the exhaust pressure of the compressor 9 in the oil cooler 2 (the pressure of the refrigerant discharged by the compressor 9) does not exceed the set value, the filter-type oil cooler system is controlled based on the oil temperature measured by the main temperature-sensing package 5. Under this premise, when the oil temperature exceeds the set value, the operating frequency of the compressor 9 and the operating frequency of the fan 13 are increased, thereby improving the cooling effect on the oil; when the operating frequency of the compressor 9 reaches the set value, the operating frequency of the compressor 9 is reduced to avoid overload damage to the compressor 9, and only the operating frequency of the fan 13 is increased. After the operating frequency of the fan 13 is increased, more efficient condensation can liquefy the high-pressure gaseous refrigerant into a medium-temperature liquid more quickly, thereby assisting in reducing the pressure on the high-pressure side of the system. Moreover, although the reduced capacity of compressor 9 leads to a reduction in cooling capacity, the improved condensation efficiency helps to maintain or even improve the cooling effect under the current system state. When the capacity of compressor 9 is limited, the cooling capacity of the oil is maintained as much as possible to avoid the oil temperature from soaring out of control.

[0041] When the working pressure of the compressor 9 in the oil cooler 2 exceeds the set value, the filter oil cooler system is controlled based on the oil temperature measured by the auxiliary temperature sensing package 4, reducing the operating frequency of the compressor 9 and only increasing the operating frequency of the fan 13, significantly improving the heat dissipation efficiency of the condenser 10, and more quickly taking away the heat released by the refrigerant during the condensation process, thereby ensuring the cooling effect on the oil.

[0042] In this embodiment, when the temperature measured by the main temperature sensing package 5 does not exceed the set value, and the operating frequency of the compressor 9 does not exceed the set value, the current operating frequencies of the compressor 9 and the fan 13 are maintained.

[0043] The specific oil temperature setting value, the exhaust pressure setting value of the compressor 9, the reduction range of the operating frequency of the compressor 9, and the increase range of the operating frequency of the fan 13 are all set according to actual conditions.

[0044] As a specific example:

[0045] The main temperature sensing package 5 and the auxiliary temperature sensing package 4 both transmit the measured oil temperature to the PLC control module. If the temperatures measured by the main temperature sensing package 5 and the auxiliary temperature sensing package 4 are both less than 25 degrees Celsius, the exhaust pressure of the compressor 9 is determined to be less than 3.2 MPa. If so, the current operating frequency of the compressor 9 and the fan 13 is maintained. If not, the frequency of the compressor 9 is reduced by 5 Hz, the frequency of the fan 13 is increased by 3 Hz, and the exhaust pressure of the current compressor 9 is determined again until the exhaust pressure of the compressor 9 is less than 3.2 MPa. If the frequency of the compressor 9 drops below 50 Hz, it is regulated only based on the temperature monitored by the auxiliary temperature sensing package 4.

[0046] If the oil temperature at at least one of the two locations measured by the main temperature sensing package 5 and the auxiliary temperature sensing package 4 is less than 25 degrees Celsius, the frequency of the compressor 9 is increased by 10Hz and the frequency of the fan 13 is increased by 3Hz. The frequency of the compressor 9 is monitored to see if it is greater than 110Hz. If it is not greater than 110Hz, it is determined whether the temperature meets the standard. If not, the frequencies of the compressor 9 and fan 13 are further increased. If the frequency of the compressor 9 increases to a level greater than 110Hz, the compressor 9 is overloaded, the frequency of the compressor 9 is reduced by 5Hz, and the frequency of the fan 13 is only increased by 3Hz. The exhaust pressure of the compressor 9 is then determined to be less than 3.2MPa. Subsequent adjustments are the same as the previous step.

[0047] Adaptive changes based on actual needs are all within the scope of protection of the present invention.

[0048] The present invention uses specific examples to illustrate the principles and implementation methods of the present invention. The above examples are only intended to help understand the method and core concept of the present invention. At the same time, those skilled in the art will find that the specific implementation methods and application scopes may vary based on the concept of the present invention. In summary, the contents of this specification should not be construed as limiting the present invention.

Claims

1. A filter-type oil cooler system based on hot and cold oil channel separation and dual temperature sensing control, used to cool an oil cooling device having a hot oil outlet and a cold oil inlet; characterized in that: The filter-type oil cooler system based on hot and cold oil channel separation and dual temperature sensing control includes: An oil cooler having a cold oil outlet and a hot oil inlet, wherein an auxiliary temperature sensing package for measuring the oil temperature is provided at the cold oil outlet; And a circulating oil tank, which is arranged close to the oil cooling equipment. The circulating oil tank has an upper oil channel and a lower oil channel, and both the upper oil channel and the lower oil channel have an oil storage function. The two ends of the upper oil channel are connected with the cold oil outlet and the cold oil inlet through a cold oil outlet pipeline and a cold oil inlet pipeline respectively, and the two ends of the lower oil channel are connected with the hot oil inlet and the hot oil outlet through a hot oil outlet pipeline and a hot oil inlet pipeline respectively; a main temperature sensing package for measuring oil temperature is also provided at the connection position between the cold oil inlet pipeline and the circulating oil tank.

2. The filter-type oil cooler system based on hot and cold oil channel separation and dual temperature sensing control according to claim 1 is characterized in that: A filter for filtering impurities in the oil is also provided at the connection position between the hot oil inlet pipeline and the circulating oil tank.

3. The filter-type oil cooler system based on hot and cold oil channel separation and dual temperature sensing control according to claim 1 is characterized in that: An oil pump is further provided on the cold oil inlet pipeline between the main temperature sensing package and the oil cooling device.

4. The filter-type oil cooler system based on hot and cold oil channel separation and dual temperature sensing control according to claim 1 is characterized in that: The cold oil outlet pipeline, the cold oil inlet pipeline, the hot oil outlet pipeline and the hot oil inlet pipeline are all provided with a shut-off valve and a pressure sensor for measuring oil pressure.

5. The filter-type oil cooler system based on hot and cold oil channel separation and dual temperature sensing control according to claim 1 is characterized in that: The oil cooler includes a cooling medium circulation component, which includes a compressor, a condenser, a throttle valve and an evaporator connected in sequence by pipelines. The hot oil inlet and the cold oil outlet are both connected to the evaporator. The cooling medium circulation component also includes a fan arranged at the condenser.

6. The filter-type oil cooler system based on hot and cold oil channel separation and dual temperature sensing control according to claim 5 is characterized in that: The condenser is a copper tube fin radiator.

7. The filter-type oil cooler system based on hot and cold oil channel separation and dual temperature sensing control according to claim 5 is characterized in that: The evaporator is a brazed plate heat exchanger.

8. The filter-type oil cooler system based on hot and cold oil channel separation and dual temperature sensing control according to claim 5 is characterized in that: The fan is a DC variable frequency fan.

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