CN112963332A - Lubricating oil cooling system of air compressor and control method thereof - Google Patents

Lubricating oil cooling system of air compressor and control method thereof Download PDF

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CN112963332A
CN112963332A CN202110211779.1A CN202110211779A CN112963332A CN 112963332 A CN112963332 A CN 112963332A CN 202110211779 A CN202110211779 A CN 202110211779A CN 112963332 A CN112963332 A CN 112963332A
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temperature
lubricating oil
pipeline
heat exchanger
control
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CN112963332B (en
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不公告发明人
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Hu Hongting
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Hu Hongting
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    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
    • F04B—POSITIVE-DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS
    • F04B39/00—Component parts, details, or accessories, of pumps or pumping systems specially adapted for elastic fluids, not otherwise provided for in, or of interest apart from, groups F04B25/00 - F04B37/00
    • F04B39/02—Lubrication
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
    • F04B—POSITIVE-DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS
    • F04B37/00—Pumps having pertinent characteristics not provided for in, or of interest apart from, groups F04B25/00 - F04B35/00
    • F04B37/10—Pumps having pertinent characteristics not provided for in, or of interest apart from, groups F04B25/00 - F04B35/00 for special use
    • F04B37/12—Pumps having pertinent characteristics not provided for in, or of interest apart from, groups F04B25/00 - F04B35/00 for special use to obtain high pressure
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
    • F04B—POSITIVE-DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS
    • F04B39/00—Component parts, details, or accessories, of pumps or pumping systems specially adapted for elastic fluids, not otherwise provided for in, or of interest apart from, groups F04B25/00 - F04B37/00
    • F04B39/04—Measures to avoid lubricant contaminating the pumped fluid
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
    • F04B—POSITIVE-DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS
    • F04B39/00—Component parts, details, or accessories, of pumps or pumping systems specially adapted for elastic fluids, not otherwise provided for in, or of interest apart from, groups F04B25/00 - F04B37/00
    • F04B39/06—Cooling; Heating; Prevention of freezing
    • F04B39/064—Cooling by a cooling jacket in the pump casing
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
    • F04B—POSITIVE-DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS
    • F04B39/00—Component parts, details, or accessories, of pumps or pumping systems specially adapted for elastic fluids, not otherwise provided for in, or of interest apart from, groups F04B25/00 - F04B37/00
    • F04B39/06—Cooling; Heating; Prevention of freezing
    • F04B39/066—Cooling by ventilation
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
    • F04B—POSITIVE-DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS
    • F04B39/00—Component parts, details, or accessories, of pumps or pumping systems specially adapted for elastic fluids, not otherwise provided for in, or of interest apart from, groups F04B25/00 - F04B37/00
    • F04B39/10—Adaptations or arrangements of distribution members
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
    • F04B—POSITIVE-DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS
    • F04B49/00—Control, e.g. of pump delivery, or pump pressure of, or safety measures for, machines, pumps, or pumping installations, not otherwise provided for, or of interest apart from, groups F04B1/00 - F04B47/00
    • F04B49/06—Control using electricity
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
    • F04B—POSITIVE-DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS
    • F04B51/00—Testing machines, pumps, or pumping installations

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  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Applications Or Details Of Rotary Compressors (AREA)

Abstract

The invention discloses an air compressor, in particular to a lubricating oil cooling system of the air compressor, which comprises an air compressor body, wherein the air compressor body comprises an air inlet, a compression chamber, an air outlet and an oil supply port, the air outlet is connected with an oil separator through a first pipeline, the oil separator is connected with an oil cooling heat exchanger through a second pipeline, a regulating valve is arranged in the three pipelines, the regulating valve comprises a first inlet end, a second inlet end and an outlet end, a third pipeline is connected with the first inlet end, the oil cooling heat exchanger is connected with the second inlet end through a fourth pipeline, and the outlet end is connected with the oil supply port through a fifth. The high-temperature lubricating oil separated from the oil separator is divided into two paths, one path of the high-temperature lubricating oil is subjected to heat exchange and cooling through the oil cooling heat exchanger and is conveyed to the regulating valve, the other path of the high-temperature lubricating oil is directly conveyed to the regulating valve, and the high-temperature lubricating oil and the low-temperature lubricating oil in the regulating valve are mixed to regulate the temperature of the lubricating oil which flows back to the air compressor.

Description

Lubricating oil cooling system of air compressor and control method thereof
Technical Field
The invention belongs to the technical field of air compressors, and particularly relates to a lubricating oil cooling system of an air compressor and a control method thereof.
Background
In the existing air compressor, the high-temperature lubricating oil separated by the oil separator after the air is exhausted by the compressor mostly adopts a cooling mode of throttling condensed liquid refrigerant and directly evaporating and exchanging heat in a plate heat exchanger. The cooled lubricant oil is returned to the compressor to lubricate and cool moving parts such as bearings, but the temperature of the lubricant oil needs to be controlled within a certain range.
Chinese patent publication No. CN101893354A discloses a supercooled oil cooler and a novel economizer screw machine refrigeration cycle system, wherein the supercooled oil cooler is a device in which an oil cooler and a liquid supercooler are placed together in a container; the system is characterized in that a compressor is connected with an oil separator, the oil separator is connected with a condenser, the condenser is connected with a liquid storage device, the liquid storage device is divided into two paths and is respectively connected with two interfaces of a super-cooling oil cooler, and oil outlets of oil components are respectively connected with one interface of the super-cooling oil cooler and one inlet of a two-position three-way valve. An oil outlet of the super-cooling oil cooler is connected with the other inlet of the two-position three-way valve, outlets of the two-position three-way valve are respectively connected with the compressor, a gas outlet of the super-cooling oil cooler is connected with an intermediate cavity of the compressor, the other outlet of the super-cooling oil cooler is connected with the throttle valve and then is connected with the evaporator, the evaporator is connected with a gas branch, and the gas branch is connected with a gas suction port of. The system ensures the high-efficiency heat exchange of the heat exchanger, can provide supercooling for the refrigerant, ensures the supercooling degree of liquid, and can meet certain long-distance liquid supply.
In the above patent, the high-temperature lubricating oil separated by the oil separator is divided into two paths, the first path is cooled by the oil cooler, the second path is not cooled, and the temperature of the lubricating oil supplied to the compression chamber in the compressor is controlled by mixing the two paths of oil paths.
Disclosure of Invention
The invention aims to solve the technical problems and provides an air compressor lubricating oil cooling system capable of timely and accurately adjusting the temperature of lubricating oil when the external temperature and the load of a compressor are changed.
The purpose of the invention is realized as follows: a lubricating oil cooling system of an air compressor comprises an air compressor body, wherein the air compressor body comprises an air inlet for sucking air, a compression chamber for compressing the air, an exhaust port for exhausting the compressed air and an oil supply port for supplying lubricating oil to the compression chamber, the exhaust port is connected with an oil separator through a first pipeline, the oil separator is connected with an oil cooling heat exchanger through a second pipeline, the oil cooling heat exchanger is provided with a cooling fan, the second pipeline is connected with a third pipeline, the third pipeline is provided with a regulating valve, the regulating valve comprises a first inlet end, a second inlet end and an outlet end, the third pipeline is connected with the first inlet end, the oil cooling heat exchanger is connected with the second inlet end through a fourth pipeline, lubricating oil from a third pipeline and the lubricating oil from the fourth pipeline are mixed in the regulating valve, and the outlet end is connected with the oil supply port through a fifth pipeline.
By adopting the technical scheme, the air compressor body comprises an air inlet, a compression chamber, an air outlet and an oil supply port, air enters the compression chamber from the air inlet, high-temperature and high-pressure compressed air is generated by compressing in the compression chamber, the compressed air and lubricating oil are discharged by the air outlet and are conveyed to the oil separator through a first pipeline, the compressed air is separated from the lubricating oil through the oil separator, the separated lubricating oil is divided into two paths through a second pipeline and a third pipeline, the second pipeline is connected with the inlet side of the oil cooling heat exchanger, the lubricating oil is cooled through the oil cooler heat exchanger and is output low-temperature lubricating oil through a fourth pipeline connected with the outlet side of the oil cooling heat exchanger, the third pipeline does not output high-temperature lubricating oil through the oil cooling heat exchanger, the regulating valve comprises a first inlet end, a second inlet end and an outlet end, the third pipeline is connected with the first inlet, the high-temperature lubricating oil output by the third pipeline and the low-temperature lubricating oil output by the fourth pipeline are mixed in the regulating valve, and the mixed lubricating oil is returned to the compression chamber through the fifth pipeline at the outlet end. The temperature of the lubricating oil in the return compression chamber is adjusted by adjusting the comparison of the mixture of the high-temperature lubricating oil and the low-temperature lubricating oil, so that the lubricating oil in the return compression chamber can be in a predetermined range. Cooling fan uses with the cooperation of oil cooling heat exchanger, can improve oil cooling heat exchanger's cooling capacity, makes oil cooling heat exchanger to the cooling that lubricating oil is faster, can in time adjust the temperature of lubricating oil when ambient temperature changes and air compressor machine load changes, makes the lubricating oil temperature of backward flow to the compression chamber at the within range of regulation.
The invention is further configured to: be equipped with the agitator in the exit end of governing valve, the agitator includes agitator and secondary agitator once, agitator orientation is close to one side of first entry end and second entry end, one side of first entry end and second entry end is kept away from to the secondary agitator orientation, agitator and the coaxial setting of secondary agitator once, be equipped with a plurality of bosss on the inner wall of exit end.
Through adopting above-mentioned technical scheme, the agitator includes agitator and secondary agitator once, and the first contact high temperature lubricating oil of once stirring and low temperature lubricating oil can make the area of contact increase of high temperature lubricating oil and low temperature lubricating oil after the agitator stirring through once, make high temperature lubricating oil and low temperature lubricating oil can carry out heat exchange fast for it is stable to mix the recovery of back lubricating oil temperature. The second stirrer is used for further stirring and mixing the high-temperature lubricating oil and the low-temperature lubricating oil on the basis of the primary stirrer, so that the fluctuation of the temperature after mixing is reduced, and the influence on the temperature measurement of the lubricating oil in the reflux compression chamber is reduced. The boss can cooperate with the agitator, increases the mixing efficiency of high temperature lubricating oil and fifth lubricating oil.
The invention is further configured to: the primary stirrer is conical, the secondary stirrer is rotatably arranged in the outlet end, a plurality of triangular blades are arranged on the secondary stirrer and are spirally arranged, the boss is triangular, and the orientation of the tip of the boss is opposite to that of the tip of the blade.
Through adopting above-mentioned technical scheme, once the agitator is close to first entry end and second entry end, contacts with high temperature lubricating oil and low temperature lubricating oil earlier, and the kinetic energy loss of high temperature lubricating oil and low temperature lubricating oil can be reduced to the shape of coniform, reduces the agitator to the influence of lubricating oil pressure. The secondary stirrer is rotatably fixed in the outlet end through the supporting frame, a plurality of triangular blades which are arranged in a spiral shape are arranged on the second stirrer, lubricating oil flows through the outlet end to drive the second stirrer to rotate, meanwhile, the second stirrer rotates to enable the interior of the inlet end to generate a turbulent flow area, the flow direction of the lubricating oil can be disturbed in the area, the high-temperature lubricating oil and the fifth lubricating oil are further mixed, and the fluctuation of the temperature of the lubricating oil after mixing is reduced.
The invention is further configured to: the oil cooling heat exchanger comprises a first heat exchanger and a second heat exchanger, a sixth pipeline and a seventh pipeline are connected between the second pipeline and a fourth pipeline, the first heat exchanger is arranged on the sixth pipeline, the second heat exchanger is arranged on the seventh pipeline, the first heat exchanger cools lubricating oil flowing through the sixth pipeline, the second heat exchanger cools the lubricating oil flowing through the seventh pipeline, a first control valve group is arranged on the sixth pipeline and comprises a first front control valve and a first rear control valve, the first front control valve is arranged at the front end of the first heat exchanger, the first rear control valve is arranged at the rear end of the first heat exchanger and controls the flow in the sixth pipeline, a second control valve group is arranged on the seventh pipeline and comprises a second front control valve and a second rear control valve, the second front control valve is arranged at the front end of the second heat exchanger, the second rear control valve is arranged at the rear end of the heat exchanger, the second control valve group controls the flow in the seventh pipeline, the third pipeline is provided with a first main control valve, the first main control valve controls the flow of the third pipeline, the second pipeline is provided with a second main control valve, and the second main control valve controls the flow of the second pipeline.
Through adopting above-mentioned technical scheme, first heat exchanger and second heat exchanger parallel arrangement side by side, first heat exchanger and second heat exchanger and cooling blower cooperation form the air current through the cooling blower drive and take away the heat on first heat exchanger and the second heat exchanger to cool off lubricating oil. The first heat exchanger is arranged on the sixth pipeline, the second heat exchanger is arranged on the seventh pipeline, the sixth pipeline and the seventh pipeline are both connected with the second pipeline and the fourth pipeline, and lubricating oil in the second pipeline is divided into two paths to flow into the sixth pipeline and the seventh pipeline, and is cooled by the first heat exchanger and the second heat exchanger respectively and then is mixed in the fourth pipeline. The first control valve group comprises a first front control valve and a first rear control valve, the first front control valve is arranged at the front end of the first heat exchanger, the first rear control valve is arranged at the rear end of the first heat exchanger, the flow of lubricating oil in the sixth pipeline can be controlled through the first control valve group, and the flow of the lubricating oil entering the first heat exchanger and the flow of the lubricating oil entering the fourth pipeline are controlled. The second control valve group comprises a second front control valve and a second rear control valve, and the second control valve group can control the flow entering the second heat exchanger in the seventh pipeline and the flow entering the fourth pipeline. The temperature of the low-temperature lubricating oil flowing out of the fourth pipeline can be changed through controlling the flow of the lubricating oil entering the first heat exchanger and the second heat exchanger, so that the temperature of the lubricating oil flowing back to the compression chamber in the fifth pipeline is adjusted. Meanwhile, the first heat exchanger and the second heat exchanger are mutually standby, and the other heat exchanger can still work normally when one heat exchanger is damaged, so that the overall reliability of the air compressor is enhanced.
The invention is further configured to: the temperature control system comprises a fifth pipeline and is characterized in that a first temperature detection device used for detecting the temperature of lubricating oil in the fifth pipeline is arranged on the fifth pipeline, the first temperature detection device is composed of a plurality of temperature sensors, the temperature detection device is connected with a first processor, the first processor is connected with a first judgment module, the first judgment module is connected with a control unit, a first preset value is arranged in the first judgment module, the first processor processes data from the first temperature detection device and outputs the processed data to the first judgment module, the first judgment module compares the data with the first preset value and then outputs a judgment result to the control unit, and the control unit controls the opening degree of a first control main valve and a second control main valve and the rotating speed of a cooling fan.
By adopting the technical scheme, the first temperature detection device is composed of three temperature sensors, the three temperature sensors are arranged on the fifth pipeline side by side to measure the lubricating oil temperature at three different points in the fifth pipeline, the three temperature sensors are connected with the first processor together and output the measured temperature of the lubricating oil in the fifth pipeline to the first processor, the first processor carries out average calculation on the input temperature book to obtain the temperature data of the lubricating oil in the fifth pipeline and outputs the temperature data to the first judgment module, the first judgment module is internally provided with a first preset value, the first preset value is the normal temperature range of the lubricating oil flowing back to the compression chamber, the temperature data calculated by the first processor is compared with the first preset value to obtain a judgment result, the judgment result is output to the control unit by the first judgment module, and the control unit carries out control on the first master control valve, And the second control main valve, the first control valve group, the second control valve group and the cooling fan are controlled to keep the temperature of the lubricating oil in the fifth pipeline within a specified range.
The invention is further configured to: the second pipeline is provided with a second temperature detection device for detecting the temperature of lubricating oil in the second pipeline, the second temperature detection device is composed of a plurality of temperature sensors, the second temperature detection device is connected with a second processor, the fourth pipeline is provided with a third temperature detection device for detecting the temperature of the lubricating oil in the fourth pipeline, the third temperature detection device is composed of a plurality of temperature sensors, the third temperature detection device is connected with a third processor, the second processor and the third processor are connected with a second judgment module, the second judgment module is connected with the control unit, a second preset value is arranged in the second judgment module, the second judgment module compares the difference value between the output data of the second processor and the output data of the third processor with the second preset value and outputs the judgment result to the control unit, and the control unit controls the first control valve bank, the second control module and the third control module, The opening degree of the second control valve group and the rotating speed of the cooling fan.
By adopting the technical scheme, the second temperature detection device is composed of three temperature sensors arranged side by side and used for measuring the temperature of the lubricating oil at three different points in the second pipeline, the three temperature sensors are connected with the second processor and used for outputting the temperature data of the lubricating oil in the second pipeline, and the second processor calculates the temperature of the lubricating oil in the second pipeline by averaging the data. The third temperature detection device is composed of three temperature sensors arranged side by side and used for measuring the temperature of the lubricating oil at three different points in the fourth pipeline, the three temperature sensors are all connected with the third processor and used for outputting the temperature data of the lubricating oil in the fourth pipeline, and the third processor calculates the temperature of the lubricating oil in the fourth pipeline on average. The second processor and the third processor are connected with the second judgment module and output the temperature of the lubricating oil in the second pipeline and the temperature of the lubricating oil in the fourth pipeline to the second judgment module, the second judgment module calculates the difference value between the temperature of the lubricating oil in the second pipeline and the temperature of the lubricating oil in the fourth pipeline and compares the difference value with a second preset value in the second judgment module, whether the heat exchange capacity of the oil cooling heat exchanger is enough or not is judged through the comparison structure, the judgment result is output to the control unit, the control unit controls the rotating speed of the first control valve group, the second control valve group and the cooling fan according to the judgment result of the second judgment module, the temperature difference value between the temperature of lubricating oil in the second pipeline and the temperature of the lubricating oil in the fourth pipeline is larger than a second preset value, the cooling capacity of the oil cooling heat exchanger is guaranteed, and the oil cooling heat exchanger has enough redundancy and responds to the change of the cooling capacity requirement of the oil cooling heat exchanger caused by the change of working conditions.
The invention is further configured to: the cooling fan comprises a first rotating speed mode, a second rotating speed mode and a common mode, the rotating speed of the first rotating speed mode is larger than that of the second rotating speed mode, the rotating speeds of the first rotating speed mode and the second rotating speed mode are both larger than that of the common mode, the cooling fan normally operates in the common mode, a third preset value is arranged in the third judging module, the third judging module compares the data of the environment temperature detecting device with the third preset value and outputs the judging result to the control unit, and the control unit controls the cooling fan to select to convert the common mode into one of the first rotating speed mode and the second rotating speed mode.
By adopting the technical scheme, the environment temperature detection device outputs the environment temperature to the third judgment module, the third judgment module compares the environment temperature with the third preset value, judges the environment temperature and outputs the judgment result to the control unit, and the control unit controls the rotating speed of the cooling fan according to the judgment result of the third judgment module. In the ordinary mode of processing at ordinary times of the cooling fan, the rotational speed of the cooling fan is lower under this mode, can satisfy normal heat dissipation to the oil cooling heat exchanger. The rotation speed of the second rotation speed mode is less than that of the first rotation speed mode, and the rotation speeds of the first rotation speed mode and the second rotation speed mode are greater than that of the common mode. When the rotating speed of the cooling fan needs to be increased so as to enhance the cooling capacity of the oil cooling heat exchanger, if the environment temperature is judged to be low, the common mode is adjusted to be a second rotating speed mode; if the environment temperature is judged to be higher, the common mode is adjusted to the first rotating speed mode. When the environmental temperature is lower, the second rotating speed mode is used, so that the temperature of the lubricating oil in the oil cooling heat exchanger can be prevented from being reduced too fast, and the fluctuation of the temperature of the mixed lubricating oil is reduced. When the ambient temperature is high, the first rotating speed mode can effectively enhance the cooling capacity of the oil cooling heat exchanger, so that the lubricating oil can be effectively cooled, and the mixed lubricating oil is in a specified temperature range.
The invention is further configured to: the air compressor comprises an air compressor body, and is characterized in that a power detection device for detecting the power of the air compressor body is arranged on the air compressor body, the power detection device is connected with a fourth judgment module, the fourth judgment module judges the power variation amplitude of the air compressor body in unit time and outputs the result to a control unit, and the control unit controls the opening degree of a first control main valve and a second control main valve and the rotating speed of a cooling fan.
Through adopting above-mentioned technical scheme, power detection device can detect the power of air compressor machine body, power detection device also connects the fourth judgement module simultaneously and exports the power data of air compressor machine, the change of air compressor machine load is judged and judged result is exported to the control unit through the change to air compressor machine power data to the fourth judgement module, the control unit is controlled first main control valve, the second main control valve, first valve unit, the rotational speed of second valve unit and cooling blower according to the judged result, make the air compressor machine can keep mixing the back flow to the lubricating oil temperature of compression chamber in the within range of regulation when the load change leads to lubricating oil temperature change.
The invention also provides a control method of the lubricating oil cooling system of the air compressor, which comprises the following steps:
s1: the temperature detection device in the first temperature detection device outputs the measured temperature data of the fifth pipeline to the first processor, and the first processor calculates the temperature data averagely to obtain that the temperature of the lubricating oil in the fifth pipeline is T1And will T1Outputting the data to a first judgment module;
s2: a first preset value is arranged in the first judgment module, and the first preset value is a normal stable range of the lubricating oil: t isx-Ty，
If T1＜TxIt is judged that the temperature of the lubricating oil is low,
if T1＞TyIt is judged that the temperature of the lubricating oil is high,
if Tx＜T1＜TyIf the temperature of the lubricating oil is normal,
and outputting the judgment result to the control unit;
s3: the control unit controls according to the result of the first judging module,
if the temperature of the lubricating oil is judged to be lower, the opening degree of the first control main valve is increased, the opening degree of the second control main valve is reduced, if the opening degree of the first control main valve is maximum, the rotating speed of the cooling fan is reduced,
if the temperature of the lubricating oil is judged to be higher, the opening degree of the first control main valve is reduced, the opening degree of the second control main valve is increased, if the opening degree of the second control main valve is the largest, the opening degree of the first control valve group is increased, if the opening degree of the first control valve group is the largest, the opening degree of the second control valve group is increased, and if the opening degree of the second control valve group is the largest, the rotating speed of the cooling fan is increased;
if the temperature of the lubricating oil is judged to be normal, no control is carried out;
s4: the temperature sensor in the second temperature detection device outputs temperature data to the second processor, and the second processor outputs temperature data to the second temperature detection deviceThe temperature of the lubricating oil in the second pipeline is T after the average calculation of the temperature data2The temperature sensor in the third temperature detection device outputs temperature data to the third processor, and the third processor calculates the temperature data averagely to obtain the temperature T of the lubricating oil in the fourth pipeline3The second processor outputs the signals to the second judgment module, and the third processor outputs the signals to the second judgment module;
s5: the difference value delta T between the temperatures of the lubricating oil in the second pipeline and the lubricating oil in the fourth pipeline is calculated in the second judgment module2-T3Wherein, a second preset value is arranged in the second judging module and is compared with the second preset value,
if the delta T is larger than a second preset value, the heat exchange capacity of the oil cooling heat exchanger is judged to be sufficient,
if the delta T is smaller than a second preset value, judging that the heat exchange capacity of the oil cooling heat exchanger is insufficient,
and outputting the judgment result to the control unit;
s6: the control unit controls according to the result of the second judging module,
if the heat exchange capacity of the oil cooling heat exchanger is judged to be enough, the control is not carried out,
if the heat exchange capacity of the oil cooling heat exchanger is judged to be insufficient, the opening degree of the first control valve group is increased,
increasing the opening of the second control valve block if the opening of the first control valve block is already at a maximum,
if the opening degree of the second control valve group is maximum, the rotating speed of the cooling fan is increased;
s7: ambient temperature T of ambient temperature detection deviceEOutputting the T to a third judgment module, setting a third preset value in the third judgment module, and outputting the TEIn comparison with a third preset value, the method,
if TEIf the temperature is higher than the third preset value, the environmental temperature is judged to be higher,
if TEIf the temperature is less than the third preset value, the environmental temperature is judged to be lower,
and outputting the judgment result to the control unit;
s8: the control unit controls according to the result of the third judging module,
if the environmental temperature is higher, the fan is adjusted from the normal mode to the first rotation speed mode,
if the environment temperature is judged to be lower, the fan is adjusted from the common mode to a second rotating speed mode;
s9: the power detection device detects the power of the air compressor and outputs the power to the fourth judgment module, the fourth module judges through the conversion of input power,
if the power rises faster, the load of the air compressor body is judged to increase,
if the power is decreased faster, the load of the air compressor body is judged to be decreased,
if the power change is small, the load of the air compressor body is judged to be unchanged,
and outputting the judgment result to the control unit;
s10: the control unit controls according to the result of the fourth judging module,
if the load of the air compressor body is judged to be increased, the opening degree of the first control main valve is reduced, the opening degree of the second control main valve is increased, if the opening degree of the second control main valve is maximum, the rotating speed of the cooling fan is increased,
if the load of the air compressor body is judged to be reduced, the opening degree of the first control main valve is increased, the opening degree of the second control main valve is reduced, if the opening degree of the first control main valve is maximum, the rotating speed of the cooling fan is reduced,
if the load of the air compressor body is not changed, the control is not carried out.
The invention has the beneficial effects that:
1. the high-temperature lubricating oil separated from the oil separator is divided into two paths, one path is subjected to heat exchange and temperature reduction through the oil cooling heat exchanger and is conveyed to the regulating valve, the other path is directly conveyed to the regulating valve, the temperature of the lubricating oil flowing back to the air compressor is regulated through the mixing of the high-temperature lubricating oil and the low-temperature lubricating oil in the regulating valve, and the oil temperature of the lubricating oil can be kept within a specified range when the environmental temperature changes and the load of the air compressor changes.
2. Inside agitator and the secondary agitator of being provided with of exit end of governing valve, be provided with the boss on the inner wall of exit end, through an agitator, secondary agitator and boss, make the lubricating oil that gets into the governing valve from first entry end and second entry end can be rotatory many times when mixing, redirecting, increase area of contact between them, make the lubricating oil of both temperatures mix more evenly, reduce the temperature fluctuation of mixing back lubricating oil, make the measurement of temperature more accurate.
3. The oil cooling heat exchanger comprises a first heat exchanger and a second heat exchanger, the first heat exchanger and the second heat exchanger are arranged in parallel, a cooling fan is shared, and the service efficiency of the cooling fan can be improved. Set up two heat exchangers simultaneously and can be convenient for to the regulation of oil cooling heat exchanger heat exchange efficiency, can improve the accuracy nature of cooling heat exchanger heat exchange efficiency through adjusting first valve unit and second valve unit to improve the accuracy nature of adjusting to the lubricating oil temperature, and first heat exchanger and second heat exchanger each other are reserve, and another still can normal use when one damages, has improved air compressor machine lubricating oil cooling system's reliability.
4. First temperature-detecting device, second temperature-detecting device and third temperature-detecting device all have a plurality of thermometers to constitute, and respectively through first treater, second treater and third treater carry out average calculation to the temperature data who collects, can improve temperature measurement's accuracy nature, use control module to control main valve of first control simultaneously, main valve of second control and cooling blower control, can improve entire system's degree of automation, improve control efficiency and control accuracy, make the regulation of the interior lubricating oil flow of third pipeline and fourth pipeline more accurate, further improve the accuracy nature that the lubricating oil backward flow oil temperature was adjusted.
5. The temperature difference between lubricating oil entering the oil cooling heat exchanger and the lubricating oil exiting the oil cooler heat exchanger is measured through the second temperature detection device and the third temperature detection device, whether the heat exchange capacity of the cooling heat exchanger is enough is judged through the second judgment module, the opening degree of the first control valve group and the second control valve group is preferentially adjusted when the heat exchange capacity of the oil cooling heat exchanger is not enough is judged, the rotating speed of the cooling fan is increased when the opening degree is maximum, the time of the cooling fan running at a high rotating speed can be reduced when the temperature of the lubricating oil is normal by improving the heat exchange capacity of the oil cooling heat exchanger, the energy consumption of the cooling fan is reduced, the use cost is saved, and.
6. The environment temperature is detected by the environment temperature detection device and is output to the third judgment module for judgment, different rotating speeds can be selected according to different environment temperatures when the rotating speed of the cooling fan is controlled to be increased by the control module, the phenomenon that the temperature of lubricating oil is too fast reduced due to the fact that the rotating speed of the fan is too high to cause too high oil temperature fluctuation is prevented, the temperature of the lubricating oil is adjusted more accurately, meanwhile, the phenomenon that a first control main valve and a second control main valve act too much can be avoided, and the reliability of the whole system is guaranteed.
7. The power of the air compressor body is detected through the power detection device and is output to the fourth judgment module to judge the power change of the air compressor body, the opening degrees of the first control main valve and the second control main valve are preferentially selected and adjusted when the temperature of lubricating oil with overlarge power change of the air compressor body needs to be adjusted, the rotating speed of the cooling fan is selectively increased or reduced, the energy consumption of the cooling fan is reduced, the use cost is saved, and the service life of equipment is prolonged.
Drawings
FIG. 1 is a schematic diagram of the configuration of the oil cooling system of the present invention;
FIG. 2 is a schematic diagram of the control system of the present invention;
FIG. 3 is a flow chart of the control system of the present invention;
FIG. 4 is a schematic view of the regulator valve of the present invention;
wherein the reference numerals are: 1. an air compressor body; 11. a first conduit; 111. a power detection device; 12. a second conduit; 121. a second control main valve; 122. a second temperature detection device; 123. a second processor; 13. a third pipeline; 131. a first control main valve; 14. a fourth conduit; 141. a third temperature detection device; 142. a third processor; 15. a fifth pipeline; 151. a first temperature detection device; 152. a first processor; 16. a sixth pipeline; 17. a seventh pipe; 2. an oil separator; 3. an oil cooling heat exchanger; 31. a first heat exchanger; 32. a second heat exchanger; 4. a first control valve group; 41. a first front control valve; 42. a first rear control valve; 5. a second control valve group; 51. a second front control valve; 52. a second rear control valve; 6. adjusting a valve; 61. a first inlet end; 62. a second inlet end; 63. an outlet end; 7. a cooling fan; 8. a control unit; 81. a first judgment module; 82. a second judgment module; 83. a third judgment module; 831. an ambient temperature detection device; 84. a fourth judging module; 9. a stirrer; 91. a primary stirrer; 92. a secondary stirrer; 921. a blade; 93. a boss; 94. a support frame.
Detailed Description
In order to make those skilled in the art better understand the technical solution of the present invention, the following description clearly and completely describes the technical solution in the embodiments of the present invention with reference to the accompanying drawings:
as shown in fig. 1, a lubricating oil cooling system of an air compressor comprises an air compressor body 1, wherein the air compressor body 1 comprises an air inlet for sucking air, a compression chamber for compressing air, an air outlet for discharging compressed air, and an oil supply port for supplying lubricating oil to the compression chamber, the air outlet is connected with an oil separator 2 through a first pipeline 11, the oil separator 2 is connected with an oil cooling heat exchanger 3 through a second pipeline 12, the oil cooling heat exchanger 3 is provided with a cooling fan 7, the second pipeline 12 is connected with a third pipeline 13, the third pipeline is provided with a regulating valve 6, the regulating valve 6 comprises a first inlet end 61, a second inlet end 62 and an outlet end 63, the third pipeline 13 is connected with the first inlet end 61, the oil cooling heat exchanger 3 is connected with the second inlet end 62 through a fourth pipeline 14, and the lubricating oil from the third pipeline 13 and the fourth pipeline 14 is mixed in the regulating valve 6, the outlet end 63 is connected to the oil supply port by a fifth conduit 15. The air compressor body 1 comprises an air inlet, a compression chamber, an air outlet and an oil supply port, air enters the compression chamber from the air inlet and is compressed in the compression chamber to generate high-temperature and high-pressure compressed air, the compressed air and lubricating oil are discharged by the air outlet and are conveyed to the oil separator 2 through a first pipeline 11, the compressed air and the lubricating oil are separated through the oil separator 2, the separated lubricating oil is divided into two paths through a second pipeline 12 and a third pipeline 13, the second pipeline 12 is connected with the inlet side of the oil cooling heat exchanger 3, the lubricating oil is cooled through the oil cooler heat exchanger and is output to low-temperature lubricating oil through a fourth pipeline 14 connected with the outlet side of the oil cooling heat exchanger 3, the third pipeline 13 does not pass through the oil cooling heat exchanger 3 to output high-temperature lubricating oil, the regulating valve 6 comprises a first inlet end 61, a second inlet end 62, the fourth pipeline 14 is connected with a second inlet end 62, the high-temperature lubricating oil output by the third pipeline 13 is mixed with the low-temperature lubricating oil output by the fourth pipeline 14 in the regulating valve 6, and the outlet end 63 returns the mixed lubricating oil to the compression chamber through the fifth pipeline 15. The temperature of the lubricating oil in the return compression chamber is adjusted by adjusting the comparison of the mixture of the high-temperature lubricating oil and the low-temperature lubricating oil, so that the lubricating oil in the return compression chamber can be in a predetermined range. Cooling blower 7 uses with the cooperation of oil cooling heat exchanger 3, can improve oil cooling heat exchanger 3's cooling capacity, makes oil cooling heat exchanger 3 to the more quick cooling of lubricating oil, can in time adjust the temperature of lubricating oil when ambient temperature changes and air compressor machine load changes, makes the lubricating oil temperature of backward flow to the compression chamber at the within range of regulation.
As shown in fig. 4, a stirrer 9 is disposed in the outlet end 63 of the regulating valve 6, the stirrer 9 includes a primary stirrer 91 and a secondary stirrer 92, the primary stirrer 91 faces one side close to the first inlet end 61 and the second inlet end 62, the secondary stirrer 92 faces one side far away from the first inlet end 61 and the second inlet end 62, the primary stirrer 91 and the secondary stirrer 92 are coaxially disposed, and a plurality of bosses 93 are disposed on an inner wall of the outlet end 63. Agitator 9 includes agitator 91 and secondary agitator 92 once, and agitator 91 contacts high temperature lubricating oil and low temperature lubricating oil at first, can make the area of contact increase of high temperature lubricating oil and low temperature lubricating oil after the stirring through agitator 91 once, makes high temperature lubricating oil and low temperature lubricating oil can carry out heat exchange fast for it is stable to mix the back lubricating oil temperature recovery. The second stirrer 9 further stirs and mixes the high-temperature lubricating oil and the low-temperature lubricating oil on the basis of the primary stirrer 91, so that the fluctuation of the temperature after mixing is reduced, and the influence on the temperature measurement of the lubricating oil in the reflux compression chamber is reduced. The boss 93 can cooperate with the agitator 9 to increase the mixing efficiency of the high-temperature lubricating oil and the fifth lubricating oil.
As shown in fig. 4, the primary stirrer 91 is conical, the secondary stirrer 92 is rotatably disposed in the outlet end 63, the secondary stirrer 92 is provided with a plurality of triangular blades 921, the blades 921 are spirally disposed, the boss 93 is triangular, and the direction of the tip of the boss 93 is opposite to the direction of the tip of the blade 921. The primary stirrer 91 is close to the first inlet end 61 and the second inlet end 62 and is firstly contacted with the high-temperature lubricating oil and the low-temperature lubricating oil, and the conical shape can reduce the kinetic energy loss of the high-temperature lubricating oil and the low-temperature lubricating oil and reduce the influence of the stirrer 9 on the lubricating oil pressure. Secondary agitator 92 passes through the rotatable fixing in exit end 63 of support frame 94, sets up a plurality of heliciform triangle-shaped blades 921 that arrange on the second agitator 9, and the exit end 63 can drive the rotation of second agitator 9 when lubricating oil flows through, and the rotation of second agitator 9 also makes the inside turbulent zone that produces of entry end simultaneously, can disturb the flow direction of lubricating oil in this region, makes high temperature lubricating oil and fifth lubricating oil further mix, reduces the fluctuation of the back lubricating oil temperature that mixes.
As shown in fig. 1, the oil cooling heat exchanger 3 includes a first heat exchanger 31 and a second heat exchanger 32, a sixth pipeline 16 and a seventh pipeline 17 are connected between the second pipeline 12 and the fourth pipeline 14, the first heat exchanger 31 is disposed on the sixth pipeline 16, the second heat exchanger 32 is disposed on the seventh pipeline 17, the first heat exchanger 31 cools the lubricating oil flowing through the sixth pipeline 16, the second heat exchanger 32 cools the lubricating oil flowing through the seventh pipeline 17, a first control valve group 4 is disposed on the sixth pipeline 16, the first control valve group 4 includes a first front control valve 41 and a first rear control valve 42, the first front control valve 41 is disposed at a front end of the first heat exchanger 31, the first rear control valve 42 is disposed at a rear end of the first heat exchanger 31, the first control valve group 4 controls a flow rate in the sixth pipeline 16, the seventh pipeline 17 is provided with a second control valve group 5, the second control valve group 5 comprises a second front control valve 51 and a second rear control valve 52, the second front control valve 51 is arranged at the front end of the second heat exchanger 32, the second rear control valve 52 is arranged at the rear end of the heat exchanger, the second control valve group 5 controls the flow in the seventh pipeline 17, the third pipeline 13 is provided with a first main control valve 131, the first main control valve 131 controls the flow of the third pipeline 13, the second pipeline 12 is provided with a second main control valve 121, and the second main control valve 121 controls the flow of the second pipeline 12. First heat exchanger 31 and second heat exchanger 32 parallel arrangement side by side, first heat exchanger 31 and second heat exchanger 32 cooperate with cooling blower 7, thereby form the heat on air current and take away first heat exchanger 31 and the second heat exchanger 32 through cooling blower 7 drive to cool off lubricating oil. The first heat exchanger 31 is arranged on the sixth pipeline 16, the second heat exchanger 32 is arranged on the seventh pipeline 17, the sixth pipeline 16 and the seventh pipeline 17 are both connected with the second pipeline 12 and the fourth pipeline 14, lubricating oil in the second pipeline 12 is divided into two paths to flow into the sixth pipeline 16 and the seventh pipeline 17, and the lubricating oil is cooled by the first heat exchanger 31 and the second heat exchanger 32 respectively and then is mixed in the fourth pipeline 14. The first control valve group 4 comprises a first front control valve 41 and a first rear control valve 42, the first front control valve 41 is arranged at the front end of the first heat exchanger 31, the first rear control valve 42 is arranged at the rear end of the first heat exchanger 31, the flow of lubricating oil in the sixth pipeline 16 can be controlled through the first control valve group 4, and the flow of lubricating oil entering the first heat exchanger 31 and the flow of lubricating oil entering the fourth pipeline 14 are controlled. The second control valve group 5 comprises a second front control valve 51 and a second rear control valve 52, and the second control valve group 5 can control the flow rate in the seventh pipe 17 into the second heat exchanger 32 and into the fourth pipe 14. The temperature of the low-temperature lubricating oil flowing out from the fourth pipeline 14 can be changed through controlling the flow rate of the lubricating oil entering the first heat exchanger 31 and the second heat exchanger 32, so that the temperature of the lubricating oil which flows back to the compression chamber in the fifth pipeline 15 is adjusted. Meanwhile, the first heat exchanger 31 and the second heat exchanger 32 are mutually standby, and the other heat exchanger can still work normally when one heat exchanger is damaged, so that the overall reliability of the air compressor is enhanced.
As shown in fig. 1 and 2, a first temperature detection device 151 for detecting the temperature of the lubricating oil in the fifth pipeline 15 is disposed on the fifth pipeline 15, the first temperature detection device 151 is composed of a plurality of temperature sensors, the temperature detection device is connected with a first processor 152, the first processor 152 is connected with a first judgment module 81, the first judgment module 81 is connected with a control unit 8, a first preset value is disposed in the first judgment module 81, the first processor 152 processes the data from the first temperature detection device 151 and outputs the processed data to the first judgment module 81, the first judgment module 81 compares the data with the first preset value and outputs a judgment result to the control unit 8, and the control unit 8 controls the opening degrees of the first main control valve 131 and the second main control valve 121 and the rotation speed of the cooling fan 7. The first temperature detecting device 151 is composed of three temperature sensors, the three temperature sensors are arranged on the fifth pipeline 15 side by side to measure the temperature of the lubricating oil at three different points in the fifth pipeline 15, the three temperature sensors are connected with the first processor 152 together and output the measured temperature of the lubricating oil in the fifth pipeline 15 to the first processor, the first processor 152 calculates the average of the input temperature book to obtain the temperature data of the lubricating oil in the fifth pipeline 15 and outputs the temperature data to the first judging module 81, a first preset value is arranged in the first judging module 81, the first preset value is the temperature range of the lubricating oil which flows back to the compression chamber normally, the temperature data calculated by the first processor 152 is compared with the first preset value to obtain a judging result, the judging result is output to the control unit 8 by the first judging module 81, and the control unit 8 compares the first control main valve 131 according to the judging result output by the first judging module 81, The second main control valve 121, the first control valve group 4, the second control valve group 5, and the cooling fan 7 are controlled to keep the temperature of the lubricating oil in the fifth pipe 15 within a predetermined range.
As shown in fig. 1 and 2, a second temperature detecting device 122 for detecting the temperature of the lubricating oil in the second pipeline 12 is disposed on the second pipeline 12, the second temperature detecting device 122 is composed of a plurality of temperature sensors, the second temperature detecting device 122 is connected with a second processor 123, a third temperature detecting device 141 for detecting the temperature of the lubricating oil in the fourth pipeline 14 is disposed on the fourth pipeline 14, the third temperature detecting device 141 is composed of a plurality of temperature sensors, the third temperature detecting device 141 is connected with a third processor 142, the second processor and the third processor 142 are connected with a second judging module 82, the second judging module 82 is connected with the control unit 8, a second preset value is disposed in the second judging module 82, the second judging module 82 compares the difference between the output data of the second processor 123 and the output data of the third processor 142 with the second preset value, and outputs the judging result to the control unit 8, the control unit 8 controls the opening degrees of the first control valve group 4 and the second control valve group 5 and the rotating speed of the cooling fan 7. The second temperature detecting device 122 is composed of three temperature sensors arranged side by side and measures the temperature of the lubricating oil at three different points in the second pipeline 12, the three temperature sensors are all connected with the second processor 123 and output the temperature data of the lubricating oil in the second pipeline 12, and the second processor 123 calculates the data on average to obtain the temperature of the lubricating oil in the second pipeline 12. The third temperature detecting device 141 is composed of three temperature sensors arranged side by side and measures the temperature of the lubricating oil at three different points in the fourth pipeline 14, the three temperature sensors are all connected with the third processor 142 and output the temperature data of the lubricating oil in the fourth pipeline 14, and the third processor 142 calculates the temperature of the lubricating oil in the fourth pipeline 14 on average. The second processor 123 and the third processor 142 are connected to the second judgment module and output the temperature of the lubricating oil in the second pipeline 12 and the temperature of the lubricating oil in the fourth pipeline 14 to the second judgment module 82, the second judgment module 82 calculates the difference between the temperature of the lubricating oil in the second pipeline 12 and the temperature of the lubricating oil in the fourth pipeline 14, compares the difference with a second preset value in the second judgment, judges whether the heat exchange capacity of the oil cooling heat exchanger 3 is sufficient or not through a comparison structure and outputs the judgment result to the control unit 8, the control unit 8 controls the rotation speeds of the first control valve group 4, the second control valve group 5 and the cooling fan 7 according to the judgment result of the second judgment module 82, so that the difference between the temperature of the lubricating oil in the second pipeline 12 and the temperature of the lubricating oil in the fourth pipeline 14 is greater than the second preset value, ensures the cooling capacity of the oil cooling heat exchanger 3, and enables the oil cooling heat exchanger 3 to have enough cooling capacity for the oil cooling heat exchanger 3 caused by redundant working condition change A change in force demand.
As shown in fig. 3, the air compressor further comprises an ambient temperature detection device 831 for detecting the ambient temperature of the air compressor body 1, the ambient temperature detection device 831 is connected with a third determination module 83, the third determination module 83 is connected with the control unit 8, the cooling fan 7 comprises a first rotation speed mode, a second rotation speed mode and a normal mode, the rotation speed of the first rotation speed mode is greater than that of the second rotation speed mode, the rotation speeds of the first rotation speed mode and the second rotation speed mode are both greater than that of the normal mode, the cooling fan 7 operates in the normal mode at ordinary times, a third preset value is arranged in the third determination module 83, the third determination module 83 compares the data of the ambient temperature detection device 831 with the third preset value and outputs the determination result to the control unit 8, and the control unit 8 controls the cooling fan 7 to select the normal mode to be changed into the first rotation speed mode, One of the second speed modes. The ambient temperature detecting device 831 outputs the ambient temperature to the third determining module 83, the third determining module 83 compares the ambient temperature with a third preset value, determines the ambient temperature and outputs the determination result to the control unit 8, and the control unit 8 controls the rotation speed of the cooling fan according to the determination result of the third determining module 83. The cooling fan 7 is usually in a common mode, the rotating speed of the cooling fan 7 is low in the mode, and normal heat dissipation of the oil cooling heat exchanger 3 can be met. The rotation speed of the second rotation speed mode is less than that of the first rotation speed mode, and the rotation speeds of the first rotation speed mode and the second rotation speed mode are greater than that of the common mode. When the rotating speed of the cooling fan 7 needs to be increased so as to enhance the cooling capacity of the oil cooling heat exchanger 3, if the environmental temperature is judged to be low, the common mode is adjusted to be the second rotating speed mode; if the environment temperature is judged to be higher, the common mode is adjusted to the first rotating speed mode. When the ambient temperature is low, the second rotating speed mode is used, so that the temperature of the lubricating oil in the oil cooling heat exchanger 3 can be prevented from being reduced too fast, and the fluctuation of the temperature of the mixed lubricating oil is reduced. When the ambient temperature is high, the first rotation speed mode can effectively enhance the cooling capacity of the oil cooling heat exchanger 3, so that the lubricating oil can be effectively cooled, and the mixed lubricating oil is in a specified temperature range.
As shown in fig. 1 and 2, a power detection device 111 for detecting the power of the air compressor body 1 is disposed on the air compressor body 1, the power detection device 111 is connected to a fourth determination module 84, the fourth determination module 84 determines the power variation range of the air compressor body 1 in a unit time and outputs the result to the control unit 8, and the control unit 8 controls the opening degrees of the first control main valve 131 and the second control main valve 121 and the rotation speed of the cooling fan 7. The power detection device 111 can detect the power of the air compressor body 1, the power detection device 111 is also connected with the fourth judgment module 84 and outputs the power data of the air compressor, the fourth judgment module 84 judges the change of the load of the air compressor through the change of the power data of the air compressor and outputs the judgment result to the control unit 8, and the control unit 8 controls the rotating speeds of the first main control valve 131, the second main control valve 121, the first control valve group 4, the second control valve group 5 and the cooling fan 7 according to the judgment result, so that the temperature of the mixed lubricating oil which flows back to the compression chamber can be kept within a specified range when the temperature of the lubricating oil changes due to the load change of the air compressor.
As shown in fig. 3, the present invention further provides a method for controlling a lubricating oil cooling system of an air compressor, comprising the following steps:
s1: the temperature detection device in the first temperature detection device 151 outputs the measured temperature data of the fifth pipeline 15 to the first processor 152, and the first processor 152 calculates the temperature data on average to obtain the temperature of the lubricating oil in the fifth pipeline 15, and outputs the temperature data to the first judgment module 81;
s2: a first preset value is arranged in the first judgment module 81, and the first preset value is a normal stable range of the lubricating oil: ,
if the temperature of the lubricating oil is lower,
if the temperature of the lubricating oil is higher,
if so, judging that the temperature of the lubricating oil is normal,
and outputs the judgment result to the control unit 8;
s3: the control unit 8 controls according to the result of the first judgment block 81,
if the lubricating oil temperature is judged to be low, the opening degree of the first control main valve 131 is increased, the opening degree of the second control main valve 121 is decreased, if the opening degree of the first control main valve 131 is maximum, the rotating speed of the cooling fan 7 is decreased,
if the temperature of the lubricating oil is higher, reducing the opening degree of the first control main valve 131, increasing the opening degree of the second control main valve 121, if the opening degree of the second control main valve 121 is the largest, increasing the opening degree of the first control valve group 4, if the opening degree of the first control valve group 4 is the largest, increasing the opening degree of the second control valve group 5, and if the opening degree of the second control valve group 5 is the largest, increasing the rotating speed of the cooling fan 7;
if the temperature of the lubricating oil is judged to be normal, no control is carried out;
s4: the temperature sensor in the second temperature detection device 122 outputs temperature data to the second processor 123, the temperature sensor in the third temperature detection device 141 outputs temperature data to the third processor 142 after averaging the temperature data, the temperature sensor in the third temperature detection device 141 outputs temperature data to the fourth processor 14 after averaging the temperature data, the second processor 123 outputs the temperature data to the second judgment module 82, and the third processor 142 outputs the temperature data to the second judgment module 82;
s5: the difference between the temperatures of the lubricating oil in the second pipeline 12 and the lubricating oil in the fourth pipeline 14 is calculated in the second judgment module 82, wherein a second preset value is arranged in the second judgment module 82, and is compared with the second preset value,
if the heat exchange capacity of the oil cooling heat exchanger 3 is larger than the second preset value, the heat exchange capacity of the oil cooling heat exchanger is judged to be enough,
if the heat exchange capacity is smaller than the second preset value, the heat exchange capacity of the oil cooling heat exchanger 3 is judged to be insufficient,
and outputs the judgment result to the control unit 8;
s6: the control unit 8 controls according to the result of the second decision block 82,
if the heat exchange capacity of the oil cooling heat exchanger 3 is judged to be enough, the control is not carried out,
if the heat exchange capacity of the oil cooling heat exchanger 3 is judged to be insufficient, the opening degree of the first control valve group 4 is increased,
the opening of the second control valve group 5 is increased if the opening of the first control valve group 4 has been maximized,
if the opening degree of the second control valve group 5 is maximum, the rotating speed of the cooling fan 7 is increased;
s7: the ambient temperature detecting device 831 outputs the ambient temperature to the third determining module 83, a third preset value is set in the third determining module 83, and the third preset value is compared with the ambient temperature,
if the temperature is higher than the third preset value, the environmental temperature is judged to be higher,
if the temperature is less than the third preset value, the environmental temperature is judged to be lower,
and outputs the judgment result to the control unit 8;
s8: the control unit 8 controls according to the result of the third decision block 83,
if the environmental temperature is higher, the fan is adjusted from the normal mode to the first rotation speed mode,
if the environment temperature is judged to be lower, the fan is adjusted from the common mode to a second rotating speed mode;
s9: the power detection device 111 detects the power of the air compressor and outputs the power to the fourth judgment module 84, which judges through the conversion of the input power,
if the power rises faster, the load of the air compressor body 1 is judged to increase,
if the power is decreased faster, the load of the air compressor body 1 is judged to be decreased,
if the power change is small, the load of the air compressor body 1 is judged not to be changed,
and outputs the judgment result to the control unit 8;
s10: the control unit 8 controls according to the result of the fourth decision block 84,
if the load of the air compressor body 1 is judged to be increased, the opening degree of the first control main valve 131 is reduced, the opening degree of the second control main valve 121 is increased, if the opening degree of the second control main valve 121 is maximum, the rotating speed of the cooling fan 7 is increased,
if the load of the air compressor body 1 is judged to be reduced, the opening degree of the first control main valve 131 is increased, the opening degree of the second control main valve 121 is reduced, if the opening degree of the first control main valve 131 is maximum, the rotating speed of the cooling fan 7 is reduced,
if the load of the air compressor body 1 is not changed, the control is not carried out.
The above-mentioned embodiments are only preferred embodiments of the present invention, not all embodiments, and other embodiments obtained by those skilled in the art based on the above-mentioned embodiments should also belong to the protection scope of the present invention without any creative effort, so that: all equivalent changes made according to the structure, shape and principle of the invention are covered by the protection scope of the invention.

Claims (9)

1. A lubricating oil cooling system of an air compressor comprises an air compressor body (1) and is characterized in that the air compressor body (1) comprises an air inlet for sucking air, a compression chamber for compressing the air, an exhaust port for discharging the compressed air and an oil supply port for supplying lubricating oil to the compression chamber, the exhaust port is connected with an oil separator (2) through a first pipeline (11), the oil separator (2) is connected with an oil cooling heat exchanger (3) through a second pipeline (12), a cooling fan (7) is arranged on the oil cooling heat exchanger (3), the second pipeline (12) is connected with a third pipeline (13), the third pipeline is provided with a regulating valve (6), the regulating valve (6) comprises a first inlet end (61), a second inlet end (62) and an outlet end (63), and the third pipeline (13) is connected with the first inlet end (61), the oil cooling heat exchanger (3) is connected with the second inlet end (62) through a fourth pipeline (14), lubricating oil from the third pipeline and the fourth pipeline is mixed in the regulating valve, and the outlet end (63) is connected with the oil supply port through a fifth pipeline (15).
2. The lubricating oil cooling system of the air compressor as claimed in claim 1, wherein a stirrer (9) is arranged in the outlet end (63) of the regulating valve (6), the stirrer (9) comprises a primary stirrer (91) and a secondary stirrer (92), the primary stirrer (91) faces to a side close to the first inlet end (61) and the second inlet end (62), the secondary stirrer (92) faces to a side far away from the first inlet end (61) and the second inlet end (62), the primary stirrer (91) and the secondary stirrer (92) are coaxially arranged, and a plurality of bosses (93) are arranged on the inner wall of the outlet end (63).
3. The lubricating oil cooling system of the air compressor as claimed in claim 2, wherein the primary stirrer (91) is conical, the secondary stirrer (92) is rotatably disposed in the outlet end (63), a plurality of triangular blades (921) are disposed on the secondary stirrer (92), the plurality of blades (921) are spirally disposed, the boss (93) is triangular, and the direction of the tip of the boss (93) is opposite to the direction of the tip of the blade (921).
4. Lubricating oil cooling system of an air compressor, according to any of claims 1-3, characterized in that the oil cooling heat exchanger (3) comprises a first heat exchanger (31) and a second heat exchanger (32), a sixth conduit (16) and a seventh conduit (17) are connected between the second conduit (12) and the fourth conduit (14), the first heat exchanger (31) is disposed on the sixth conduit (16), the second heat exchanger (32) is disposed on the seventh conduit (17), the first heat exchanger (31) cools the lubricating oil flowing through the sixth conduit (16), the second heat exchanger (32) cools the lubricating oil flowing through the seventh conduit (17), a first control valve group (4) is disposed on the sixth conduit (16), the first control valve group (4) comprises a first front control valve (41) and a first rear control valve (42), the first front control valve (41) is arranged at the front end of the first heat exchanger (31), the first rear control valve (42) is arranged at the rear end of the first heat exchanger (31), the first control valve group (4) controls the flow in a sixth pipeline (16), a second control valve group (5) is arranged on the seventh pipeline (17), the second control valve group (5) comprises a second front control valve (51) and a second rear control valve (52), the second front control valve (51) is arranged at the front end of the second heat exchanger (32), the second rear control valve (52) is arranged at the rear end of the heat exchanger, the second control valve group (5) controls the flow in the seventh pipeline (17), a first control main valve (131) is arranged on the third pipeline (13), the first control main valve (131) controls the flow of the third pipeline, and a second control main valve (121) is arranged on the second pipeline (12), a second main control valve (121) controls the flow of the second conduit.
5. The system of claim 4, wherein the fifth pipeline (15) is provided with a first temperature detection device (151) for detecting the temperature of the lubricating oil in the fifth pipeline (15), the first temperature detection device (151) is composed of a plurality of temperature sensors, the temperature detection device is connected with a first processor (152), the first processor (152) is connected with a first judgment module (81), the first judgment module (81) is connected with a control unit (8), the first judgment module (81) is provided with a first preset value, the first processor (152) processes the data from the first temperature detection device (151) and outputs the processed data to the first judgment module (81), the first judgment module (81) compares the data with the first preset value and outputs the judgment result to the control unit (8), the control unit (8) controls the opening degrees of the first control main valve (131), the second control main valve (121), the first control valve group (4) and the second control valve group (5) and the rotating speed of the cooling fan (7).
6. The lubricating oil cooling system of the air compressor as claimed in claim 4, wherein the second pipeline (12) is provided with a second temperature detecting device (122) for detecting the temperature of the lubricating oil in the second pipeline (12), the second temperature detecting device (122) is composed of a plurality of temperature sensors, the second temperature detecting device (122) is connected with a second processor (123), the fourth pipeline (14) is provided with a third temperature detecting device (141) for detecting the temperature of the lubricating oil in the fourth pipeline (14), the third temperature detecting device (141) is composed of a plurality of temperature sensors, the third temperature detecting device (141) is connected with a third processor (142), the second processor (123) and the third processor (142) are connected with a second judging module (82), the second judging module (82) is connected with the control unit (8), and a second preset value is arranged in the second judgment module (82), the second judgment module (82) compares the difference value between the output data of the second processor (123) and the output data of the third processor (142) with the second preset value and then outputs the judgment result to the control unit (8), and the control unit (8) controls the opening degrees of the first control valve group (4) and the second control valve group (5) and the rotating speed of the cooling fan (7).
7. The lubricating oil cooling system of the air compressor according to claim 4, further comprising an ambient temperature detection device (831) for detecting the ambient temperature of the air compressor body (1), wherein the ambient temperature detection device (831) is connected with a third judgment module (83), the third judgment module (83) is connected with the control unit (8), the cooling fan (7) comprises a first rotation speed mode, a second rotation speed mode and a normal mode, the rotation speed of the first rotation speed mode is greater than that of the second rotation speed mode, the rotation speeds of the first rotation speed mode and the second rotation speed mode are both greater than that of the normal mode, the cooling fan normally operates in the normal mode, a third preset value is arranged in the third judgment module (83), the third judgment module (83) compares the data of the ambient temperature detection device (831) with the third preset value and outputs the judgment result to the control unit (8), the control unit (8) controls the cooling fan (7) to select to change the common mode into one of a first rotating speed mode and a second rotating speed mode.
8. The lubricating oil cooling system of the air compressor as claimed in claim 4, wherein the air compressor body (1) is provided with a power detection device (111) for detecting the power of the air compressor body, the power detection device (111) is connected with a fourth judgment module (84), the fourth judgment module (84) judges the power variation range of the air compressor body (1) in unit time and outputs the result to the control unit (8), and the control unit (8) controls the opening degrees of the first control main valve (131), the second control main valve (121), the first control valve group (4), the second control valve group (5) and the rotating speed of the cooling fan (7).
9. A control method of a lubricating oil cooling system of an air compressor is characterized by comprising the following steps:
s1: the temperature detection device in the first temperature detection device (151) outputs the measured temperature data of the fifth pipeline (15) to the first processor (152), and the first processor (152) calculates the average of the temperature data to obtain the internal lubrication of the fifth pipeline (15)Temperature of the lubricating oil is T1And will T1Output to a first judgment module (81);
s2: a first preset value is arranged in the first judgment module (81), and the first preset value is a normal stable range of the lubricating oil: t isx-Ty，
If T1＜TxIt is judged that the temperature of the lubricating oil is low,
if T1＞TyIt is judged that the temperature of the lubricating oil is high,
if Tx＜T1＜TyIf the temperature of the lubricating oil is normal,
and outputs the judgment result to the control unit (8);
s3: the control unit (8) controls according to the result of the first judging module (81),
if the lubricating oil temperature is judged to be low, the opening degree of the first control main valve (131) is increased, the opening degree of the second control main valve (121) is decreased, if the opening degree of the first control main valve (131) is maximum, the rotating speed of the cooling fan (7) is reduced,
if the temperature of the lubricating oil is higher, reducing the opening degree of a first control main valve (131), increasing the opening degree of a second control main valve (121), if the opening degree of the second control main valve (121) is the largest, increasing the opening degree of a first control valve group (4), if the opening degree of the first control valve group (4) is the largest, increasing the opening degree of a second control valve group (5), and if the opening degree of the second control valve group (5) is the largest, increasing the rotating speed of a cooling fan (7);
if the temperature of the lubricating oil is judged to be normal, no control is carried out;
s4: the temperature sensor in the second temperature detection device (122) outputs temperature data to the second processor (123), and the second processor calculates the temperature data averagely to obtain the temperature T of the lubricating oil in the second pipeline (12)2The temperature sensor in the third temperature detection device (141) outputs temperature data to the third processor (142), and the third processor calculates the temperature data averagely to obtain that the temperature of the lubricating oil in the fourth pipeline (14) is T3The second processor (123) outputs to the second judging module (82), and the third processor (142) outputs to the second judging module (82);
s5: the difference value delta T between the temperatures of the lubricating oil in the second pipeline (12) and the lubricating oil in the fourth pipeline (14) is calculated in a second judgment module (82)2-T3Wherein a second preset value is arranged in the second judging module (82) and is compared with the second preset value,
if the delta T is larger than a second preset value, the heat exchange capacity of the oil cooling heat exchanger is judged to be sufficient,
if the delta T is smaller than a second preset value, judging that the heat exchange capacity of the oil cooling heat exchanger is insufficient,
and outputs the judgment result to the control unit (8);
s6: the control unit (8) controls according to the result of the second judgment module (82),
if the heat exchange capacity of the oil cooling heat exchanger is judged to be enough, the control is not carried out,
if the heat exchange capacity of the oil cooling heat exchanger is judged to be insufficient, the opening degree of the first control valve group (4) is increased,
if the opening degree of the first control valve group (4) is maximum, the opening degree of the second control valve group (5) is increased,
if the opening degree of the second control valve group (5) is maximum, the rotating speed of the cooling fan (7) is increased;
s7: ambient temperature T of ambient temperature detection deviceEOutputting the T to a third judging module (83), wherein a third preset value is arranged in the third judging module (83), and the T is converted into the TEIn comparison with a third preset value, the method,
if TEIf the temperature is higher than the third preset value, the environmental temperature is judged to be higher,
if TEIf the temperature is less than the third preset value, the environmental temperature is judged to be lower,
and outputs the judgment result to the control unit (8);
s8: the control unit (8) controls according to the result of the third judging module (83),
if the environmental temperature is higher, the fan is adjusted from the normal mode to the first rotation speed mode,
if the environment temperature is judged to be lower, the fan is adjusted from the common mode to a second rotating speed mode;
s9: the power detection device (111) detects the power of the air compressor and outputs the power to the fourth judgment module (84), the fourth module judges through the conversion of input power,
if the power rises faster, the load of the air compressor body (1) is judged to increase,
if the power is reduced faster, the load of the air compressor body (1) is judged to be reduced,
if the power change is small, the load of the air compressor body (1) is judged not to be changed,
and outputs the judgment result to the control unit (8);
s10: the control unit (8) performs control according to the result of the fourth judgment module (84),
if the load of the air compressor body (1) is judged to be increased, the opening degree of the first control main valve (131) is reduced, the opening degree of the second control main valve (121) is increased, if the opening degree of the second control main valve (121) is maximum, the rotating speed of the cooling fan (7) is increased,
if the load of the air compressor body (1) is judged to be reduced, the opening degree of the first control main valve (131) is increased, the opening degree of the second control main valve (121) is reduced, if the opening degree of the first control main valve (131) is maximum, the rotating speed of the cooling fan (7) is reduced,
if the load of the air compressor body (1) is not changed, the control is not carried out.
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