CN111425382A - Low-speed emptying compressor control system - Google Patents

Low-speed emptying compressor control system Download PDF

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Publication number
CN111425382A
CN111425382A CN202010390057.2A CN202010390057A CN111425382A CN 111425382 A CN111425382 A CN 111425382A CN 202010390057 A CN202010390057 A CN 202010390057A CN 111425382 A CN111425382 A CN 111425382A
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China
Prior art keywords
pipeline
valve
oil
air inlet
emptying
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CN202010390057.2A
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Chinese (zh)
Inventor
陈伟成
杨获
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GUANGDONG GANEY PRECISION MACHINERY CO Ltd
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GUANGDONG GANEY PRECISION MACHINERY CO Ltd
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Priority to CN202010390057.2A priority Critical patent/CN111425382A/en
Publication of CN111425382A publication Critical patent/CN111425382A/en
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    • FMECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F04POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
    • F04BPOSITIVE-DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS
    • F04B49/00Control, 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
    • F04B49/02Stopping, starting, unloading or idling control
    • F04B49/03Stopping, starting, unloading or idling control by means of valves
    • FMECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F04POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
    • F04BPOSITIVE-DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS
    • F04B39/00Component 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
    • F04B39/10Adaptations or arrangements of distribution members
    • F04B39/102Adaptations or arrangements of distribution members the members being disc valves
    • F04B39/1026Adaptations or arrangements of distribution members the members being disc valves without spring
    • FMECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F04POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
    • F04BPOSITIVE-DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS
    • F04B49/00Control, 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
    • F04B49/02Stopping, starting, unloading or idling control
    • F04B49/03Stopping, starting, unloading or idling control by means of valves
    • F04B49/035Bypassing

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  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Compressor (AREA)

Abstract

The invention discloses a low-speed emptying compressor control system which comprises a compressor, an air inlet valve, a butterfly valve cylinder, an oil-gas separator, an adding and unloading electromagnetic valve, an emptying normally closed electromagnetic valve and an emptying normally open electromagnetic valve, wherein the air inlet valve is connected with the compressor, a butterfly valve plate is arranged at an air inlet of the air inlet valve, a one-way valve plate is arranged at an air outlet of the air inlet valve, the compressor is connected with the oil-gas separator through an oil-gas mixing pipeline, the oil-gas separator is connected with the butterfly valve cylinder through a first pipeline, the adding and unloading electromagnetic valve is arranged on the first pipeline, the oil-gas separator is connected with an air inlet of the air inlet valve through a second pipeline, the emptying normally closed electromagnetic valve is arranged on the second pipeline, the oil-gas separator is connected with the air inlet of the air inlet valve through a third. The invention realizes low-speed or gear-shifting emptying when unloading or stopping, sudden stopping and the like emptying, and realizes quick internal pressure establishment when starting, so that the lubricating oil is internally circulated under sufficient pressure.

Description

Low-speed emptying compressor control system
Technical Field
The invention relates to the technical field of compressors, in particular to a control system of a low-speed emptying compressor.
Background
When the compressor is commonly used as the pressure of a common specification, namely 7, 8 and 13bar, the conventional emptying system basically accords with the use, when the pressure is higher, when the oil-gas separator is small, the machine type is small, the emptying speed is high when the conventional emptying system is used, the temperature and the pressure in the oil-gas separator are easy to change greatly, air dissolved in oil can quickly escape to generate oil bubbles, the problem that the oil bubbles are brought out from an emptying pipe along with the air is generated, the oil leaks to the outside from an air filter inlet, even the oil flows to the outside of the machine, the appearance is influenced, meanwhile, the oil is brought out, the oil level in the oil-gas separator is reduced, the oil consumption of the machine is insufficient, and the normal operation of the machine is influenced. As shown in fig. 1, the existing unloading compressor control system includes an unloading and loading solenoid valve 106, a butterfly valve cylinder 102, and an unloading valve 107, the butterfly valve cylinder 102 is connected to an oil-gas separator 105 through a pipeline 108, the unloading and loading solenoid valve 106 is disposed on the pipeline 108, the unloading and loading solenoid valve 106 is connected in parallel with the unloading valve 107, when the prior art air compressor shown in fig. 1 is unloaded or stopped, the butterfly valve cylinder 102 and the unloading valve 107 are simultaneously controlled by the unloading and loading solenoid valve 106, the unloading valve 107 is closed during loading, the gas is divided into two paths after passing through the unloading valve 107, one path is discharged before the butterfly valve plate 103, and the other path enters the main unit 100 for internal circulation after passing through the orifice to discharge the butterfly valve plate 103. The method has the defects that when unloading, sudden stop and fault stop are carried out, the emptying speed is the same, the diameter of the emptying pipe 109 is the same, so the emptying speed is the same, the method cannot adapt to the condition that a high-pressure machine needs a slow emptying function when the machine is suddenly stopped, high-pressure gas is put into a host machine at the same time, the host machine has a safety problem, oil leakage is caused to an oil seal, the problem of oil leakage is caused to the host machine, the diameter of an air inlet small hole on a butterfly valve plate needs to be small due to slow control of the emptying speed during starting, the internal pressure is built too slowly during starting, the machine damage caused by poor performance can be caused, if the diameter of an air inlet hole of the butterfly valve plate is large, and the unloading speed is too slow, the safety valve 110 can be exploded at the moment, the safety valve 110 is often exploded, so that oil. In addition, as shown in fig. 2, the existing emptying compressor control system includes an unloading and loading solenoid valve 206, a butterfly valve cylinder 202, an emptying normally open solenoid valve 207, the butterfly valve cylinder 202 is connected with an oil separator 205 through a first pipeline 208, the unloading and loading solenoid valve 206 is arranged on the first pipeline 208, the oil separator 205 is connected to the front side of the butterfly valve plate 203 of the air inlet valve through an emptying pipeline 209, the emptying normally open solenoid valve 206 is arranged on the emptying pipeline 209, the emptying pipeline 209 branches off to a branch 220 to be connected to the rear side of the butterfly valve plate 203 of the air inlet valve 201, in this way, the independent emptying normally open solenoid valve 207 is used to replace the emptying valve 107 in the scheme of fig. 1, and the defects of the scheme of fig. 1 also exist. Patent number is CN201820514163.5 discloses a gas compressor, including compressor, motor, admit air and cross filter and vapour and liquid separator, be connected through first lubricated oil duct, second lubricated oil duct and cooler between compressor and the vapour and liquid separator, admit air and cross and be connected through the unloading passageway between filter and the vapour and liquid separator. This patent only empties this way of return circuit of unloading passageway, and does not have the relief pressure valve on the secondary returns oil pipe, leads to too much compressed air to flow away, causes the loss of energy consumption big. In addition to the above-mentioned problems, there is also a problem that the prior art discharges the airless water separator, which causes the pressure-released air to separate out water, and the water is discharged back to the compressor, which causes oil emulsion and damages the compressor. In addition, the pressure in front of the throttling hole cannot be adjusted in the prior art, so that the differential pressure at two ends of the throttling hole is large, and the discharged air volume is large. Therefore, the existing control system is used for a machine with higher pressure and has more defects.
Disclosure of Invention
The invention aims to overcome the defects of the prior art and provide a method for realizing low-speed emptying when unloading, stopping and emptying, scram or fault stopping and emptying are carried out, so that the temperature and the pressure in an oil-gas separator are slowly reduced, the release of air dissolved in oil is effectively inhibited, a large amount of oil bubbles are prevented from being formed, the problem of safety valve explosion due to overpressure is avoided, gear-shifting emptying is realized when sudden stopping or fault stopping and emptying are carried out, namely the emptying speed is slower, the effect of inhibiting the generation of the oil bubbles is better, a host is protected from overpressure damage, and the phenomena of unloading abnormal sound and the like are avoided. In addition, the control system of the low-speed emptying compressor is started to realize quick internal pressure building when the small air inlet hole is small or unconditional, so that lubricating oil is internally circulated under sufficient pressure.
The invention is realized by the following technical scheme: a low-speed emptying compressor control system comprises a compressor, an air inlet valve, a butterfly valve cylinder, an oil-gas separator, an unloading electromagnetic valve, an emptying normally closed electromagnetic valve and an emptying normally open electromagnetic valve, wherein the air inlet valve is connected with the compressor, an air inlet of the air inlet valve is provided with a butterfly valve plate, an air inlet small hole is formed in the butterfly valve plate, an one-way valve plate is arranged at an air outlet of the air inlet valve, the compressor is connected with the oil-gas separator through an oil-gas mixing pipeline, the oil-gas separator is connected with the butterfly valve cylinder through a first pipeline, the unloading electromagnetic valve is arranged on the first pipeline, the butterfly valve cylinder is used for controlling the opening and closing of the butterfly valve plate, the oil-gas separator is connected with the air inlet of the air inlet valve through a second pipeline, the tail end of the second pipeline is located at the rear side of the butterfly valve plate, the emptying normally, the oil-gas separator is connected with the air inlet of the air inlet valve through a third pipeline, the tail end of the third pipeline is located on the front side of the butterfly valve plate, the emptying normally-open electromagnetic valve is arranged on the third pipeline, a fourth pipeline is branched from the second pipeline and connected to the air inlet valve, the tail end of the fourth pipeline is located on the front side of the butterfly valve plate, and an overflow valve is arranged on the fourth pipeline.
Further: still include the bypass solenoid valve, the bypass solenoid valve sets up on the bypass pipeline, the both ends of bypass pipeline are connected respectively the air inlet and the gas outlet of admission valve, and its both ends are located respectively butterfly valve plate front side and check valve plate front side.
Further: the oil-gas separator is characterized by further comprising a primary oil return pipeline and a secondary oil return pipeline, two ends of the primary oil return pipeline are connected with the compressor and the oil-gas separator respectively, an oil content core is arranged in the oil-gas separator, two ends of the secondary oil return pipeline are connected with the compressor and the oil content core respectively, and an oil return pressure reducing valve, an oil return throttling valve and a one-way valve are arranged on the secondary oil return pipeline.
Further: and the second pipeline and the third pipeline are both provided with throttle valves.
Further: and a gas-water separator is arranged on the second pipeline.
Further: and the first pipeline is provided with a pressure reducing valve.
The invention has the advantages of
Compared with the prior art, when the oil-gas separator is started, the bypass electromagnetic valve is opened, the emptying normally closed electromagnetic valve is opened, the emptying normally open electromagnetic valve is opened, the loading and unloading electromagnetic valve is closed, at the moment, the bypass pipeline and the air inlet small hole on the butterfly valve plate jointly feed air, the internal pressure is quickly established, the air input during starting can be randomly adjusted, the air inlet small hole on the butterfly valve plate is kept unchanged, and the air quantity or speed of emptying can be realized without increasing; during loading, the bypass electromagnetic valve is closed, the emptying normally closed electromagnetic valve is closed, the emptying normally open electromagnetic valve is closed, the loading and unloading electromagnetic valve is opened, so that gas in the oil-gas separator enters the butterfly valve cylinder through the first pipeline, the butterfly valve cylinder controls the butterfly valve plate to be opened, and air enters the compressor for loading; when unloading, the bypass electromagnetic valve is closed, the emptying normally closed electromagnetic valve is opened, the emptying normally open electromagnetic valve is opened, the loading and unloading electromagnetic valve is closed, the disc valve plate of the air inlet valve is closed, only a small amount of gas enters the compressor from the small air inlet hole of the disc valve plate, the emptying normally closed electromagnetic valve and the emptying normally open electromagnetic valve are simultaneously opened during emptying, and double-path emptying is realized; when the emergency stop or the fault stop is carried out, the emptying normally closed electromagnetic valve is closed, the loading and unloading electromagnetic valve is closed, the bypass electromagnetic valve is closed, the emptying normally open electromagnetic valve is opened, the pressure of the system is slowly and quickly released, namely, the gas in the oil-gas separator is returned to the front side of the butterfly valve plate through a third pipeline and directly enters the oil-gas separator to discharge the internal pressure air, meanwhile, because the normally closed electromagnetic valve for emptying is closed, namely the second pipeline is not emptied, the emptying speed is changed to emptying, the second pipeline and the third pipeline are emptied into one way (the third pipeline) during unloading, and slower emptying is realized, the air filter can effectively prevent the over-high emptying speed caused by sudden stop or fault shutdown, so that the temperature and the pressure of the oil-gas separator are reduced quickly to cause oil foaming, the oil bubbles of the oil-gas separator run to the air filter from the third pipeline, and the oil is sprayed out of the air filter to influence the use. Therefore, when the compressor is unloaded and emptied or stopped and emptied (unloading is performed first and then the compressor is stopped, namely the oil-gas separator is stopped after the internal pressure is reduced first), the phenomenon that when an air inlet small hole is smaller than the prior art, the emptying speed is low, double-path emptying is performed, and sudden shutdown and emptying or fault shutdown (the internal pressure of the oil-gas separator is not reduced, and the oil-gas separator is stopped directly at high pressure) are realized, the phenomenon of oil spitting is effectively prevented, meanwhile, when the compressor is started, the air inlet small hole is smaller than the prior art, but after an air inlet bypass is increased, air inlet is performed more quickly than the prior art to establish the internal pressure, and the lubricating oil is ensured to be circulated in the internal pressure. The gas-water separator has the effects that gas is converted from high pressure to low pressure during emptying due to higher gas pressure, water can be released, the water needs to be separated and discharged outside, and the oil is prevented from entering a compressor to cause oil emulsification and damage the service life of lubricating oil. The secondary oil return pipeline is provided with the oil return pressure reducing valve and then passes through the throttling hole, so that the air volume of the compressed air can be effectively reduced and directly discharged back to the main machine for secondary compression, namely, the pressure difference between the front and the back of the throttling hole is obviously reduced, and the energy consumption of the compressor is reduced. The invention is suitable for various compressors with different pressure ranges.
Drawings
FIGS. 1 and 2 are schematic diagrams of prior art vent compressor control system configurations;
FIG. 3 is a schematic structural view of the present invention;
FIG. 4 is a schematic diagram of a butterfly valve plate structure;
fig. 5 is a schematic view of an intake valve configuration.
Description of reference numerals: 1-compressor, 2-air inlet valve, 21-butterfly valve cylinder, 22-butterfly valve plate, 221-air inlet small hole, 23-one-way valve plate, 24-first pipeline, 25-air filter, 26-pressure reducing valve, 27-butterfly valve plate front hole, 28-one-way valve plate front hole, 3-bypass electromagnetic valve, 31-bypass pipeline, 4-oil separator, 41-oil-gas mixing pipeline, 42-minimum pressure valve, 43-one-way exhaust valve, 44-safety valve, 45-oil core, 5-loading and unloading electromagnetic valve, 6-emptying normally closed electromagnetic valve, 61-second pipeline, 62-throttle valve, 63-air-water separator, 7-emptying normally open electromagnetic valve, 71-third pipeline, 8-fourth pipeline, 81-overflow valve, 9-secondary oil return pipeline, 91-oil return pressure reducing valve, 92-oil return throttling valve, 93-one-way valve, 10-primary oil return pipeline, 100-main engine, 101-air inlet valve, 102-butterfly valve cylinder, 103-butterfly valve plate, 104-one-way valve plate, 105-oil-gas separator, 106-loading and unloading electromagnetic valve, 107-vent valve, 108-pipeline, 109-vent pipe, 110-safety valve, 200-main engine, 201-air inlet valve, 202-butterfly valve cylinder, 203-butterfly valve plate, 204-one-way valve plate, 205-oil-gas separator, 206-loading and unloading electromagnetic valve, 207-venting normally open electromagnetic valve, 208-first pipeline, 209-venting pipeline and 220 branch.
Detailed Description
Fig. 3-5 are schematic structural diagrams of an embodiment of a low-speed emptying compressor control system provided by the invention, which includes a compressor 1, an air inlet valve 2, a butterfly valve cylinder 21, an oil-gas separator 4, an unloading and loading electromagnetic valve 5, an emptying normally closed electromagnetic valve 6, an emptying normally open electromagnetic valve 7, wherein the air inlet valve 2 is connected with the compressor 1, an air inlet of the air inlet valve 2 is provided with a butterfly valve plate 22, the butterfly valve plate 22 is provided with an air inlet small hole 221, an air outlet of the air inlet valve 2 is provided with a one-way valve plate 23, the compressor 1 is connected with the oil-gas separator 4 through an oil-gas mixing pipeline 41, the oil-gas separator 4 is connected with the butterfly valve cylinder 21 through a first pipeline 24, the unloading and loading electromagnetic valve 5 is arranged on the first pipeline 24, the butterfly valve cylinder 21 is used for controlling the opening and closing of the butterfly valve plate 22, the oil-gas separator 4 is, the emptying normally closed electromagnetic valve 6 is arranged on the second pipeline 61, the oil-gas separator 4 is connected with the air inlet of the air inlet valve 2 through a third pipeline 71, the tail end of the third pipeline 71 is positioned on the front side of the butterfly valve plate 22, the emptying normally open electromagnetic valve 7 is arranged on the third pipeline 71, a fourth pipeline 8 branched from the second pipeline 61 is connected to the air inlet valve 2, the tail end of the fourth pipeline is positioned on the front side of the butterfly valve plate 22, an overflow valve 81 is arranged on the fourth pipeline, a throttle valve 62 is arranged on each of the second pipeline 61 and the third pipeline 71, and an air-water separator 63 is arranged on the second pipeline 61.
The air inlet valve 2 is provided with a butterfly valve plate front hole 27 and a one-way valve plate front hole 28, the tail end of the fourth pipeline 8 is communicated to the front side of the butterfly valve plate 22 through the butterfly valve plate front hole 27, and the tail end of the second pipeline 61 is communicated to the rear side of the butterfly valve plate 22 through the one-way valve plate front hole 28. The direction shown by the arrow in fig. 3 is the fluid flowing direction, according to the fluid flowing direction, the end where the fluid enters the second pipeline 61 is the head end, the end where the fluid exits the second pipeline 61 is the tail end, and the first pipeline 24, the third pipeline 71, the fourth pipeline 8, the primary oil return pipeline 10 and the secondary oil return pipeline 9 are divided into the head end and the tail end in the same way as the second pipeline 61.
The butterfly valve plate is characterized by further comprising a bypass electromagnetic valve 3, wherein the bypass electromagnetic valve 3 is arranged on a bypass pipeline 31, two ends of the bypass pipeline 31 are respectively connected with an air inlet and an air outlet of the air inlet valve 2, and two ends of the bypass pipeline 31 are respectively located on the front side of the butterfly valve plate 22 and the front side of the check valve plate 23.
The oil-gas separation device is characterized by further comprising a primary oil return pipeline 10 and a secondary oil return pipeline 9, two ends of the primary oil return pipeline 10 are respectively connected with the compressor 1 and the oil-gas separator 4, an oil core 45 is arranged in the oil-gas separator 4, two ends of the secondary oil return pipeline 9 are respectively connected with the compressor 1 and the oil core 45, and an oil return pressure reducing valve 91, an oil return throttling valve 92 and a one-way valve 93 are arranged on the secondary oil return pipeline 9.
A pressure relief valve 26 is provided in the first line 24.
When the oil-gas separator is started, the bypass electromagnetic valve 3, the emptying normally closed electromagnetic valve 6 and the emptying normally open electromagnetic valve 7 are simultaneously opened, the loading and unloading electromagnetic valve 5 is closed, the butterfly valve plate 22 is controlled to be closed by the butterfly valve cylinder 21, air is filtered by the air filter 25 and then enters the compressor 1 from the bypass pipeline 31 through the large-aperture bypass electromagnetic valve 3 and the small air inlet hole 221 in the butterfly valve plate 22, internal pressure is quickly built for the oil-gas separator 4, and lubricating oil has enough pressure to perform internal circulation.
After the starting is finished, when loading is carried out, the bypass electromagnetic valve 3, the emptying normally closed electromagnetic valve 6 and the emptying normally open electromagnetic valve 7 are closed simultaneously, the loading and unloading electromagnetic valve 5 is opened, gas in the oil-gas separator 4 leads to the butterfly valve cylinder 21 through the first pipeline 24, the butterfly valve cylinder 21 controls the butterfly valve plate 22 to be opened, the air enters the compressor 1 from the air inlet valve 2, the compressor 1 is loaded to realize the compression of the air, the compressed air is discharged to the oil-gas separator 4 through the oil-gas mixing pipe 41 to be subjected to gas-oil separation rough separation, and is filtered through the oil core 45, the obtained compressed air is discharged from the minimum pressure valve 42, and residual oil filtered out by the oil core 45 circulates back to the compressor 1 from the secondary oil return pipeline 9.
During unloading, the loading and unloading electromagnetic valve 5 is closed, the butterfly valve plate 22 is controlled to be closed by the butterfly valve cylinder 21, the bypass electromagnetic valve 3 is closed, a large amount of air does not enter the compressor 1 any more, and the air inlet small hole 221 on the butterfly valve plate 22 is reserved for air inlet; the emptying normally closed electromagnetic valve 6 is powered on to be opened and the emptying normally open electromagnetic valve 7 is powered off to be opened, compressed air in the oil-gas separator 4 is emptied through the third pipeline 71, the fourth pipeline 8 and the second pipeline 61 simultaneously, the compressed air is returned to the front side of the butterfly valve plate 22 through the third pipeline 71 and is regulated by the emptying normally open electromagnetic valve 7 and the throttle valve 62, the compressed air is returned to the rear side of the butterfly valve plate 22 through the second pipeline 61, the emptying normally closed electromagnetic valve 6 and the gas-water separator 63, the compressed air enters the compressor 1 through the one-way valve plate 23 to supplement air to the compressor 1 to obtain enough internal circulation gas, abnormal sound is not generated when the compressor 1 is unloaded, the gas-water separator 63 is used for discharging the air out of the compressor 1 after separating out from water, when the emptying normally closed electromagnetic valve 6 fails or the pressure in the oil-gas separator 4 is high and is emptied at the moment, the overflow valve 81 is opened to return excessive gas to the front side of the butterfly valve plate 22 through, it is possible to prevent excessive high-pressure gas from being introduced into the compressor 1 and to prevent oil damage or compressor 1 damage. The overflow valve 81 may be replaced by a minimum pressure valve, a safety valve, or the like, and the same function may be achieved.
Through the adjustment of the throttle valve 62, when the pressure in the system reaches the set lowest pressure during emptying, the pressure does not drop any more, so that the air inflow and the air outflow of the compressor 1 are balanced, and the internal pressure of the system is always kept in unloading operation. The bypass electromagnetic valve 3 is closed and does not act, only the air inlet small hole 221 is used for air inlet at this time, the second pipeline 61 and the third pipeline 71 are emptied simultaneously, and under the three conditions, the emptying speed is high, so that the internal pressure of the system is reduced, and the safety valve 45 is prevented from being exploded due to overhigh internal pressure of the oil-gas separator 4. The overflow valve 81 is used for discharging excessive overpressure gas to the front side of the butterfly valve plate 22 through the fourth pipeline 8 through the overflow valve 81 when the normally closed emptying electromagnetic valve 6 fails or the pressure in the oil-gas separator 4 is high and discharged at the moment of unloading, so that excessive high-pressure gas is prevented from being discharged into the compressor 1, and the phenomenon that the compressor 1 bursts a main engine due to the fact that the pressure exceeds the bearing pressure or oil leakage due to the fact that oil seal exceeds the pressure is effectively prevented. By arranging the gas-water separator 63 on the second pipeline 61, when the internal pressure is unloaded and discharged, the phenomenon that the compressed air changes the pressure and the temperature to separate out condensed water and put the condensed water back into the compressor 1 to cause oil damage or compressor damage is avoided.
During loading, the emptying normally open electromagnetic valve 7 is powered on and closed, the emptying normally closed electromagnetic valve 6 is powered off and closed, the bypass electromagnetic valve 3 is closed and does not act, the loading and unloading electromagnetic valve 5 is powered on and opened, so that gas in the oil-gas separator 4 enters the butterfly valve cylinder 21 through the first pipeline 24, the butterfly valve cylinder 21 controls the butterfly valve plate 22 to be opened, and the air is filtered by the air filter 25 and then enters the compressor 1 from the air inlet valve 2 to carry out loading work.
When scram or the fault shutdown, the control system cuts off the power supply, the normally closed solenoid valve 6 of unloading is closed, add unloading solenoid valve 5 and bypass solenoid valve 3 and close, only the normally open solenoid valve 7 of unloading is opened, carry out release slowly to the pressure of system, only put back the gas in oil and gas separator 4 to butterfly valve plate 22 front side through third pipeline 71 promptly, directly reach oil and gas separator 4 and empty the completion internal pressure, simultaneously, because of the normally closed solenoid valve 6 of unloading is closed that second pipeline 61 does not empty, become the unloading of the same way by two way empties at this moment, realize unloading speed gear shift unloading, the unloading speed is slowest this moment. For the medium-high pressure oil injection compressor, the phenomenon that the oil in the oil-gas separator 4 is foamed due to the fact that the emptying speed is too high when the oil-gas separator is stopped suddenly or in a fault mode, the oil in the oil-gas separator 4 runs to the air filter 25 from the third pipeline 71, and the oil is sprayed out of the air filter 25 to affect the use of a customer can be effectively prevented.
In summary, when starting, the bypass electromagnetic valve 3 is opened, the normally closed vent electromagnetic valve 6 is opened, the normally open vent electromagnetic valve 7 is opened, the loading and unloading electromagnetic valve 5 is closed, at this time, the bypass pipeline 31 and the small air inlet hole 221 of the butterfly valve plate 22 are used for air inlet together, the small air inlet hole 221 is smaller than the existing one, double air inlet of the small air inlet hole 221 and the bypass electromagnetic valve 3 is realized by adding the bypass electromagnetic valve 3, internal pressure is quickly established, the air inlet amount during starting can be adjusted at will through the bypass electromagnetic valve 3, the small air inlet hole 221 on the butterfly valve plate 22 is kept unchanged, the air volume or speed of venting can be realized without increasing, the prior art only increases the small air inlet hole 221 on the butterfly valve plate 22, thus the air volume during venting is increased inevitably or the speed of venting is increased, namely, the vent hole of venting is increased, so as to achieve the unchanged; after the motor of the compressor 1 completes the star-delta conversion or is delayed for a set time, the controller sends a loading instruction, the bypass electromagnetic valve 3 is closed, the emptying normally closed electromagnetic valve 6 is closed, the emptying normally open electromagnetic valve 7 is closed, the loading and unloading electromagnetic valve 5 is opened, and the butterfly valve cylinder 21 is opened to control the butterfly valve plate 22 to be loaded when being opened.
The above uses such as repeated each start, uninstallation, shut down or scram make the machine suitable for more operating modes and accord with the user demand. The low-speed emptying under the multi-working condition can be realized, the emptying speed of different gears of unloading and sudden stop (fault stop) is realized, the oil leakage problem of the emptying belt is prevented, and the system pressure is quickly established during starting. Meanwhile, the main engine is effectively protected through the overflow valve 81, air is supplied into the compressor 1 when the emptying normally closed electromagnetic valve 6 is unloaded, abnormal sound caused by high vacuum degree is effectively prevented when the compressor 1 is unloaded, the pressure of the secondary oil return pipeline 9 is reduced through the oil return pressure reducing valve 91, and compressed air is effectively prevented from flowing away too much to achieve the energy-saving effect.
The above detailed description is specific to possible embodiments of the present invention, and the embodiments are not intended to limit the scope of the present invention, and all equivalent implementations or modifications that do not depart from the scope of the present invention are intended to be included within the scope of the present invention.

Claims (6)

1. The utility model provides a low-speed air-release compressor control system which characterized in that: the air inlet valve is connected with the compressor, a butterfly valve plate is arranged at an air inlet of the air inlet valve, an air inlet small hole is formed in the butterfly valve plate, a one-way valve plate is arranged at an air outlet of the air inlet valve, the compressor is connected with the oil-gas separator through an oil-gas mixing pipeline, the oil-gas separator is connected with the butterfly valve plate through a first pipeline, the loading and unloading electromagnetic valve is arranged on the first pipeline, the butterfly valve plate is used for controlling the opening and closing of the butterfly valve plate, the oil-gas separator is connected with the air inlet of the air inlet valve through a second pipeline, the tail end of the second pipeline is located at the rear side of the butterfly valve plate, the unloading normally closed electromagnetic valve is arranged on the second pipeline, and the oil-gas separator is connected with the air inlet of the air inlet valve through a third pipeline, the tail end of the third pipeline is located on the front side of the butterfly valve plate, the emptying normally-open electromagnetic valve is arranged on the third pipeline, a fourth pipeline is branched from the second pipeline and connected to the air inlet valve, the tail end of the fourth pipeline is located on the front side of the butterfly valve plate, and an overflow valve is arranged on the fourth pipeline.
2. The control system of a low-speed discharge compressor according to claim 1, wherein: still include the bypass solenoid valve, the bypass solenoid valve sets up on the bypass pipeline, the both ends of bypass pipeline are connected respectively the air inlet and the gas outlet of admission valve, and its both ends are located respectively butterfly valve plate front side and check valve plate front side.
3. The control system of a low-speed discharge compressor according to claim 2, wherein: the oil-gas separator is characterized by further comprising a primary oil return pipeline and a secondary oil return pipeline, two ends of the primary oil return pipeline are connected with the compressor and the oil-gas separator respectively, an oil content core is arranged in the oil-gas separator, two ends of the secondary oil return pipeline are connected with the compressor and the oil content core respectively, and an oil return pressure reducing valve, an oil return throttling valve and a one-way valve are arranged on the secondary oil return pipeline.
4. The control system of a low-speed discharge compressor according to claim 1, wherein: and the second pipeline and the third pipeline are both provided with throttle valves.
5. The control system of a low-speed discharge compressor according to claim 3, wherein: and a gas-water separator is arranged on the second pipeline.
6. The control system of a low-speed discharge compressor according to any one of claims 1 to 5, wherein: and the first pipeline is provided with a pressure reducing valve.
CN202010390057.2A 2020-05-09 2020-05-09 Low-speed emptying compressor control system Pending CN111425382A (en)

Priority Applications (1)

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CN202010390057.2A CN111425382A (en) 2020-05-09 2020-05-09 Low-speed emptying compressor control system

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CN107035671A (en) * 2017-06-23 2017-08-11 山河智能装备股份有限公司 A kind of air compressor air intake control system and its control method
CN208040710U (en) * 2018-01-17 2018-11-02 萨震压缩机(上海)有限公司 Oil sealing oil return apparatus and air compressor machine with oil sealing oil return apparatus
CN212296816U (en) * 2020-05-09 2021-01-05 广东正力精密机械有限公司 Low-speed emptying compressor control system

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CN101832286A (en) * 2009-03-09 2010-09-15 谭程程 Automatic control device for forced draught fan
CN204663896U (en) * 2014-12-31 2015-09-23 深圳市冠瑞达能源装备有限公司 A kind of pneumatic control system of natural gas screw compressor
CN107035671A (en) * 2017-06-23 2017-08-11 山河智能装备股份有限公司 A kind of air compressor air intake control system and its control method
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