KR20090122641A - The invertor oil cooler applies coolant germ pressure system - Google Patents

Abstract

PURPOSE: An inverter oil cooler with a coolant pressure stabilizing apparatus is provided to minimize the stand-by time of the inverter compressor within two seconds by keeping high and low pressures of coolant uniform. CONSTITUTION: An inverter oil cooler comprises a plate evaporator(10) which cools oil, an inverter compressor(20) in which vaporized coolant of low temperature and low pressure flows in through a CFC transfer pipe(11) and compressed to high temperature and high pressure, a coolant pressure stabilizing device(30), a condenser(40) which radiates the high temperature and high pressure coolant by a fan(50) driven by a motor(M), a drier(60) through which the condensed liquid coolant passes, and an electronic expansion valve(70) which discharges the liquid coolant of low temperature and low pressure by controlling sensor channels of an exterior temperature sensor(41), a coolant low pressure sensor(12), and oil inlet and outlet sensors(1,1'). The discharged liquid coolant of low temperature and low pressure is transferred to a jet evaporator to cool down oil.

Description

Inverter oil cooler applies coolant germ pressure system

The present invention relates to an inverter oil cooler applying a refrigerant equalizer to an oil cooler using an environmentally friendly new refrigerant, R-410a. The refrigerant equalizing device is attached to the refrigerant circulation pipe to equalize the high pressure and low pressure of the refrigerant, thereby minimizing the standby time of the inverter compressor, improving the freezing performance and improving the processing precision of the machine tool. .

      In general, the main error factors affecting the machining precision of industrial machine tools are greatly influenced by disturbances such as deformation due to ambient temperature and cutting force. Has the biggest impact of 40-70% of the total machining error, so heat stability is essential for a long time to maintain high accuracy of industrial machine tools.

      The oil used in the industrial machine tool is used to smoothly operate the machine tool and minimize the deformation of the workpiece. The hydraulic oil, lubricating oil, cutting oil and grinding oil, etc., are raised in temperature due to frictional heat or outside air generated during processing. Cooling the oil is essential because it leads to a decrease in the efficiency of the machine and a defective workpiece.

      Conventional industrial oil coolers (CFC-based) R-22, R-12 are used and this causes the ozone layer to be destroyed and global warming, which is expected to be banned from 2010 under the Kyoto Protocol Convention. In developed countries such as the United States, Japan, and Europe, fluoride carbon (HFC-based) refrigerants (R-134a, R-407c, and R-410a), which are environmentally friendly alternative refrigerants, are being converted.

      The conventional oil cooler has a cylindrical coil type of evaporator, a capillary orifice tube of expansion mechanism, a brazing cell tube type of condenser, a rotary type of compressor, and a control type of compressor. It takes about 30 minutes and the flow rate of the refrigerant is fixed, so the system size of the oil cooler is largely configured, so that the response to changes in the surrounding environment is not properly made, and the freezing performance is deteriorated. There was a problem that the set temperature deviation of was higher than ㅁ 3-4 ℃, which affected the machining accuracy and caused the displacement error of the machine tool.

      Therefore, the present invention was created for the purpose of solving the conventional problems as described above by equipping the refrigerant equalizer with an oil cooler using an environmentally friendly alternative refrigerant R-410a (HFC-based) to equalize the high and low pressure of the refrigerant By minimizing the standby time of the inverter compressor within 2 minutes, it compensates the superheat by controlling the four sensor channels in the equipment ambient temperature, oil inlet and outlet temperature difference, refrigerant low pressure, oil coolant inlet and outlet, and set the freezing capacity temperature of the oil inlet and outlet. Variation ㅁ Within 0.5 ℃, the lubricant, hydraulic oil, cooling oil and cutting oil, which are used for various equipments, are changed according to the room temperature or the temperature change of the machine, and the oil temperature is controlled by the freezer to prevent thermal deformation of the machine. Maintain viscosity and lubrication characteristics to improve the machining precision of machine tools, extend the life of the machine and minimize the defects of the workpiece It is possible to provide a high efficiency oil cooler.

      The present invention provides an oil cooler that draws oil from the oil inlet side to a plate evaporator by means of an oil circulating pump and draws it to the oil outlet side, thereby cooling the oil in the plate evaporator and converting the vaporized low temperature low pressure refrigerant into a low pressure refrigerant transfer pipe. The low temperature low pressure refrigerant is introduced into the compressor through the compressor, and the low temperature low pressure refrigerant is compressed to high temperature and high pressure to be transferred to the condenser through the refrigerant equalization device. The refrigerant through the dryer to control the external air temperature sensor, the refrigerant low pressure sensor, and the sensor channel of the oil inlet and outlet sensor to spray the appropriate amount of low temperature low pressure liquid refrigerant to cool the oil by the cycle flowing into the evaporator. Characterized in that it can be made.

      Therefore, the present invention is to replace the old CFC-based refrigerant that caused the destruction of the ozone layer and global warming with a new eco-friendly HFC-based refrigerant is not affected by the change of the condensation pressure even during long time operation by the refrigerant equalizer and the electronic expansion valve Temperature control and viscosity and lubrication of oils used in industrial machine tools that require high accuracy, and extend the life of the machine by preventing the machine's heat deformation, minimize the defect rate of the workpiece and improve the processing precision. There is one effect.

      Hereinafter, the configuration and operation of the present invention will be described in detail with reference to the accompanying drawings.

      1 is a circulation system of the oil and refrigerant of the present invention in the plate-type evaporator, while the two types of fluids and the oil passes through the refrigerant coolant low temperature low-pressure refrigerant absorbs the heat of the high temperature oil is cooled to the machine tool Supplying and evaporating the low-temperature and low-pressure refrigerant gas from the inverter compressor to the high-temperature and high-pressure refrigerant gas through the refrigerant equalizing device to radiate and condense the refrigerant gas by operating the fan motor in the condenser. 2, 3, and 4 are conceptual views of the front, side, and planar structures of the oil cooler of the present invention, and the high temperature oil is cooled by the refrigerant in the plate type evaporator and then supplied to the machine tool by the oil circulation pump. And the oil cooled refrigerant is evaporated through the inverter compressor, refrigerant equalizer, condenser, fan, dryer and electronic expansion valve. A structure in which a circulating shows.

      Oil cooler (O) which draws and cools the oil at the oil inlet side of the oil cooler (O) using the eco-friendly alternative refrigerant R-410a to the plate type evaporator 10 by the oil circulation pump (P) and draws it to the oil outlet side. To

      Cooling oil in the plate type evaporator 10 and the vaporized low-temperature low-pressure refrigerant flows into the inverter compressor 20 through the low-pressure refrigerant transfer pipe 11 and compresses the low-temperature low-pressure refrigerant to high temperature and high pressure refrigerant equalizer The high temperature and high pressure refrigerant, which is transferred to the condenser 40 through the fan 30 and operated by the motor M in the condenser 40, is radiated by condensing and liquefying the high temperature and high pressure refrigerant to the dryer 60. The low temperature low pressure liquid refrigerant is injected by controlling the sensor channels of the outside temperature sensor 41, the refrigerant low pressure sensor 12, and the oil inlet / outlet sensor 1, 1 'from the electronic expansion valve 70. By cooling the oil by the cycle flowing into the evaporator (10).

      The refrigerant equalizing device 30 is supplied to the high-pressure refrigerant transfer pipe 32 in which the high-temperature, high-pressure refrigerant introduced from the inverter compressor 20 is closed and the solenoid valve 31 is installed, and the high-pressure refrigerant when the solenoid valve 31 is opened. High pressure refrigerant low pressure transfer pipe (33) is installed to send the low pressure refrigerant transfer pipe (11) and the check valve 34 is installed at the tip of the high pressure refrigerant transfer pipe (32) is configured to send to the condenser (40). It became.

      Oil inlet and outlet sensors (1) (1 ') controlled by the electronic expansion valve 70 is installed on the inlet and outlet side of the oil and the refrigerant low pressure sensor 12 is installed in the low pressure refrigerant transfer pipe (11) The outside air temperature sensor 41 is installed on the condenser 40 side.

      In the drawings, reference numeral 2 denotes a main controller, 3 an electronic expansion valve controller, 21 an accumulator, 61 a refrigerant pressure sensor, and 62 a refrigerant level gauge.

      Thus, the present invention replaces the old refrigerant (R-22, R-12) that destroys the ozone layer and causes global warming, and changes the condensation pressure even when using the oil cooler using the new refrigerant (R-410a) for a long time. It is not affected by the pressure, and the high and low pressures of the refrigerant are equalized to minimize the operation standby delay time of the compressor within 2 minutes to improve the freezing performance and to set the temperature difference of the freezing capacity of the oil inlet and outlet within ㅁ 0.5 ℃. It is to provide an oil cooler that can be maintained.

      As shown in FIGS. 1 to 4, the oil on the oil inlet side equipped with the oil inlet sensor 1 is introduced into the plate type evaporator 10 by the oil circulating pump P, so that the oil cooled by the refrigerant is transferred to the oil outlet. Various devices are cooled by drawing them to the oil outlet side on which the sensor 1 'is mounted.

      The plate type evaporator 10 has a structure in which two fluids, a refrigerant and an oil, intersect and pass. The high-temperature oil in which the refrigerant liquid of low temperature and low pressure intersects when a high temperature oil flows into the oil circulation pump P. It absorbs heat and becomes a fully evaporated gas.

      The plate type evaporator 10 is a plate heat exchanging (PHE) type, and the number of plates is increased to increase the amount of heat, and the pressure can be maintained even at a high pressure of 45 bar or more, and thus the size of the oil cooler (O). It has the advantage of being compact and lightweight.

      The evaporated low temperature low pressure refrigerant gas is introduced into the inverter compressor 20 through the accumulator 21 through the low pressure refrigerant transfer pipe 11, and the low temperature low pressure refrigerant gas introduced at the high temperature and high pressure from the inverter compressor 20 is higher than 35 bar. Compressed to send to the refrigerant equalizing device (30).

      The inverter compressor 20 adjusts the amount of compression of the refrigerant by frequency control.

      The inverter compressor 20 does not have a start capacitor due to the frequency control, so that the operation delay time at the time of restarting at low speed, high speed, and stop state is reduced to 2 minutes within 20 minutes. By opening and closing the installed solenoid valve 31, the high-temperature and high-pressure refrigerant gas is mixed with the high pressure and low pressure through the high-pressure refrigerant low-pressure transfer pipe 33 to equalize the pressure of the refrigerant and transferred to the high-pressure pump pipe to the inverter compressor (20) The vane vane remains safe and operates smoothly. At the same time as the inverter compressor 20 operates, the solenoid valve 31 is closed to transfer the refrigerant gas of high temperature and high pressure to the condenser 40 through the check valve 34. .

      The high temperature and high pressure refrigerant gas transferred to the condenser 40 releases heat of the high temperature and high pressure refrigerant gas by the fan 50 operated by the condenser 40 and the motor M to liquefy into a high temperature and high pressure refrigerant liquid. Let's do it.

      The condenser 40 is a parallel flow condenser (PFC) type, which has a large heat transfer area and a large amount of heat transfer, thus has a high cooling effect, and a small cooling fin is mounted on the refrigerant flow passage to increase the heat transfer amount and the number of intermediate ribs. It has a high reinforcement and increases durability at high pressure.

      The high temperature and high pressure refrigerant liquid is transferred to the electronic expansion valve 70 through the refrigerant pressure sensor 61 and the refrigerant oil level gauge 62 by removing moisture and foreign matter in the refrigerant liquid in the dryer 60.

      The pressure sensor 61 turns off the inverter compressor 20 when the safety sensor is at a high pressure of the inverter compressor 20 in the ON / OFF type.

      In the electronic expansion valve 70, the high temperature and high pressure refrigerant liquid is injected into the plate evaporator 10 as a refrigerant liquid of low temperature and low pressure.

      The electronic expansion valve 70 is not affected by the condensation pressure and the oil inlet and outlet sensors (1) (1 ') and the low pressure refrigerant conveying pipe (11) mounted at the inlet and outlet of the oil of the oil cooler (O). The coolant low pressure sensor 12 and the outside air temperature sensor 41 mounted on the condenser 40 side are controlled by the sensor channel to compensate for overheating and respond quickly to large load fluctuations for precise control. By effectively utilizing the heat transfer area of the evaporator 10 according to the conditions it is possible to effectively use energy and to maintain a low superheat degree to increase the refrigeration efficiency of the system.

     In addition, the present invention is the inverter control method of the frequency conversion of the input AC (60Hz, 50Hz, 40

Hz) by controlling the rotational speed of the compressor 20 by varying the refrigerant flow rate it is possible to precisely control the fluctuation of the control temperature within ㅁ 0.5 ℃.

      The present invention is not limited to the above-described specific preferred embodiments, and various modifications can be made by those skilled in the art without departing from the gist of the present invention as claimed in the claims. And such changes fall within the scope of the claims.

      1 is a circulation system diagram of an oil and a refrigerant of the present invention.

      2 is a conceptual view of the front structure of the oil cooler of the present invention

      3 is a side view conceptual view of the oil cooler of the present invention

      4 is a schematic structural view of the oil cooler of the present invention

<Description of the symbols for the main parts of the drawings>

1,1 ': Oil inlet and outlet sensor 10: Plate type evaporator

11: low pressure refrigerant delivery pipe 12: refrigerant low pressure sensor

20: inverter compressor 30: refrigerant equalizer

31: solenoid valve 32: high pressure refrigerant transfer pipe

33: high pressure refrigerant low pressure transfer pipe 34: check valve

40: condenser 41: outside temperature sensor

50: fan 60: dryer

70: electronic expansion valve M: motor

O: oil cooler P: oil circulation pump

Claims (3)

      Oil cooler (O) which draws and cools the oil at the oil inlet side of the oil cooler (O) using the eco-friendly alternative refrigerant R-410a to the plate type evaporator 10 by the oil circulation pump (P) and draws it to the oil outlet side. To       Cooling oil in the plate type evaporator 10 and the vaporized low-temperature low-pressure refrigerant flows into the inverter compressor 20 through the low-pressure refrigerant transfer pipe 11 and compresses the low-temperature low-pressure refrigerant to high temperature and high pressure refrigerant equalizer The high temperature and high pressure refrigerant, which is transferred to the condenser 40 through the fan 30 and operated by the motor M in the condenser 40, is radiated by condensing and liquefying the high temperature and high pressure refrigerant to the dryer 60. The low temperature low pressure liquid refrigerant is injected by controlling the sensor channels of the outside temperature sensor 41, the refrigerant low pressure sensor 12, and the oil inlet / outlet sensor 1, 1 'from the electronic expansion valve 70. Inverter oil cooler using a refrigerant equalizing device, characterized in that to cool the oil by the cycle flowing into the evaporator (10).       The method of claim 1,       The refrigerant equalizing device 30 is supplied to the high-pressure refrigerant transfer pipe 32 in which the high-temperature, high-pressure refrigerant introduced from the inverter compressor 20 is closed and the solenoid valve 31 is installed, and the high-pressure refrigerant when the solenoid valve 31 is opened. High pressure refrigerant low pressure transfer pipe (33) is installed to send the low pressure refrigerant transfer pipe (11) and the check valve 34 is installed at the tip of the high pressure refrigerant transfer pipe (32) is configured to send to the condenser (40) Inverter oil cooler to which the refrigerant equalizing device is applied.       The method of claim 1,       Oil inlet and outlet sensors (1) (1 ') controlled by the electronic expansion valve 70 is installed on the inlet and outlet side of the oil and the refrigerant low pressure sensor 12 is installed in the low pressure refrigerant transfer pipe (11) The outside air temperature sensor 41 is an inverter oil cooler to which a refrigerant equalization device is installed, characterized in that installed on the condenser 40 side.

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