A control system for a low-speed blowdown compressor

Abstract

The invention discloses a low-speed venting compressor control system, including a compressor, an intake valve, a butterfly valve cylinder, an oil-gas separator, a loading and unloading solenoid valve, a venting normally closed solenoid valve, and a venting normally open solenoid valve. The intake valve is connected to the compressor, the intake valve inlet is provided with a butterfly valve plate, the intake valve outlet is provided with a one-way valve plate, the compressor is connected to the oil-gas separator through an oil-gas mixing pipeline, the oil-gas separator is connected to the butterfly valve cylinder through a first pipeline, the loading and unloading solenoid valve is arranged in the first pipeline, the oil-gas separator is connected to the intake valve inlet through a second pipeline, the venting normally closed solenoid valve is arranged in the second pipeline, the oil-gas separator is connected to the intake valve inlet through a third pipeline, the venting normally open solenoid valve is arranged in the third pipeline, the second pipeline branches out a fourth pipeline to connect the intake valve, and the fourth pipeline is provided with a relief valve. The invention realizes low-speed or shift venting when unloading, shutting down, emergency stopping, etc., and realizes rapid establishment of internal pressure when starting, so that the lubricating oil circulates internally under sufficient pressure.

Description

Technical Field

[0001] The invention relates to the technical field of compressors, and in particular to a control system for a low-speed venting compressor. Background Art

[0002] When the compressor is used at a conventional pressure of 7, 8, and 13 bar, the existing venting system is basically suitable for use. When the pressure is higher, and the oil-gas separator is smaller, and the machine model is smaller, the existing venting system has the problem of fast venting, and the temperature and pressure in the oil-gas separator are prone to large changes. The air dissolved in the oil will quickly escape to produce oil bubbles, and the oil bubbles will be brought out of the vent pipe with the air, leaking to the outside from the air filter inlet, and even flowing to the outside of the machine, affecting the appearance. At the same time, the oil is brought out, and the oil level in the oil-gas separator drops, resulting in insufficient oil for the machine, affecting the normal operation of the machine. Figure 1 As shown, the existing venting compressor control system includes a loading and unloading solenoid valve 106, a butterfly valve cylinder 102, and a venting valve 107. The butterfly valve cylinder 102 is connected to the oil-gas separator 105 through a pipeline 108. The loading and unloading solenoid valve 106 is arranged on the pipeline 108. The loading and unloading solenoid valve 106 and the venting valve 107 are connected in parallel. Figure 1 When the prior art air compressor shown is unloaded or shut down, the loading and unloading solenoid valve 106 is used to simultaneously control the butterfly valve cylinder 102 and the vent valve 107. When loading, the vent valve 107 is closed, and the gas is divided into two paths after passing through the vent valve 107. One path is placed in front of the butterfly valve plate 103, and the other path is returned to the butterfly valve plate 103 through the throttle hole and enters the main engine 100 for internal circulation. The disadvantage of this method is that the venting speed is the same during unloading, emergency stop, and shutdown due to fault. Since the diameter of the vent pipe 109 is the same, the venting speed is the same, and it cannot adapt to the slow venting function required for high-pressure machines during emergency stops. At the same time, there is a safety problem of the main engine when high-pressure gas is put into the main engine, and there is a damage and oil leakage problem to the oil seal. During startup, due to the slow control of the venting speed, the diameter of the air inlet hole on the butterfly valve plate needs to be reduced, resulting in too slow establishment of internal pressure during startup, which may cause poor oil supply and damage to the machine. If the diameter of the air inlet hole of the butterfly valve plate is large and the venting speed is adjusted too slowly, the safety valve 110 may explode at the moment of unloading. Frequent explosion of the safety valve 110 causes oil to splash into the machine, resulting in oil everywhere in the machine. In addition, Figure 2As shown, the existing venting compressor control system includes a loading and unloading solenoid valve 206, a butterfly valve cylinder 202, and a venting normally open solenoid valve 207. The butterfly valve cylinder 202 is connected to the oil-gas separator 205 through a first pipeline 208. The loading and unloading solenoid valve 206 is arranged on the first pipeline 208. The oil-gas separator 205 is connected to the front side of the butterfly valve plate 203 of the intake valve through a venting pipeline 209. The venting normally open solenoid valve 206 is arranged on the venting pipeline 209. The venting pipeline 209 branches out a branch 220 connected to the rear side of the butterfly valve plate 203 of the intake valve 201. This method uses an independent venting normally open solenoid valve 207 instead of Figure 1 The vent valve 107 in the scheme also exists Figure 1 The inadequacy of the scheme. Patent No. CN201820514163.5 discloses a gas compressor, including a compressor, a motor, an air intake filter and a gas-liquid separator. The compressor and the gas-liquid separator are connected through a first lubricating oil channel, a second lubricating oil channel and a cooler, and the air intake filter and the gas-liquid separator are connected through a vent channel. This patent only has a venting circuit, the venting channel, and no pressure reducing valve is provided on the secondary oil return pipe, resulting in excessive compressed air flowing away, causing a large loss of energy consumption. In addition to the same defects mentioned above, there is also the problem that the existing technology vents the airless water separator, causing the air that releases the pressure to precipitate water, and this part of the water is returned to the compressor to cause oil emulsification and damage the compressor. And the existing technology cannot adjust the pressure before the throttle hole, so that the pressure difference between the two ends of the throttle is large, and the amount of gas discharged is large. Therefore, the existing control system is used on machines with higher pressures, and there are many defects. Summary of the invention

[0003] The purpose of the present invention is to overcome the shortcomings of the above-mentioned prior art and provide a method for achieving low-speed emptying during unloading emptying, shutdown emptying, emergency stop or fault shutdown emptying, so that the temperature and pressure in the oil-gas separator slowly drop, effectively suppressing the release of air dissolved in the oil, preventing the formation of a large number of oil bubbles, and not causing the safety valve to explode due to overpressure. In addition, the emptying can be achieved by shifting gears during emergency stop or fault shutdown emptying, that is, the emptying speed is slower, and the effect of suppressing the generation of oil bubbles is better, which has the function of protecting the main engine from overpressure damage, and there is no phenomenon of abnormal noise during unloading. In addition, when the air inlet hole is very small or unconditional, the internal pressure can be quickly established to enable the lubricating oil to circulate internally under sufficient pressure.

[0004] The present invention is realized through the following technical scheme: a control system for a low-speed venting compressor, comprising a compressor, an intake valve, a butterfly valve cylinder, an oil-gas separator, a loading and unloading solenoid valve, a venting normally closed solenoid valve, and a venting normally open solenoid valve, wherein the intake valve is connected to the compressor, the air inlet of the intake valve is provided with a butterfly valve plate, the butterfly valve plate is provided with an air inlet hole, the air outlet of the intake valve is provided with a one-way valve plate, the compressor is connected to the oil-gas separator through an oil-gas mixing pipeline, the oil-gas separator is connected to the butterfly valve cylinder through a first pipeline, the loading and unloading solenoid valve is provided on the first pipeline, and the butterfly valve is provided on the first pipeline. The valve cylinder is used to control the opening and closing of the butterfly valve plate. The oil-gas separator is connected to the air inlet of the intake valve through a second pipeline, and the end of the second pipeline is located on the rear side of the butterfly valve plate. The vent normally closed solenoid valve is arranged on the second pipeline. The oil-gas separator is connected to the air inlet of the intake valve through a third pipeline, and the end of the third pipeline is located on the front side of the butterfly valve plate. The vent normally open solenoid valve is arranged on the third pipeline. A fourth pipeline is branched from the second pipeline and connected to the intake valve, and the end of the fourth pipeline is located on the front side of the butterfly valve plate. An overflow valve is arranged on the fourth pipeline.

[0005] Furthermore: it also includes a bypass solenoid valve, which is arranged on a bypass pipeline, and the two ends of the bypass pipeline are respectively connected to the air inlet and the air outlet of the intake valve, and its two ends are respectively located on the front side of the butterfly valve plate and the front side of the one-way valve plate.

[0006] Furthermore: it also includes a primary oil return pipeline and a secondary oil return pipeline, the two ends of the primary oil return pipeline are respectively connected to the compressor and the oil-gas separator, an oil separation core is arranged in the oil-gas separator, the two ends of the secondary oil return pipeline are respectively connected to the compressor and the oil separation core, and the secondary oil return pipeline is provided with an oil return pressure reducing valve, an oil return throttle valve and a one-way valve.

[0007] Furthermore: throttle valves are provided on the second pipeline and the third pipeline.

[0008] Furthermore: a gas-water separator is arranged on the second pipeline.

[0009] Furthermore: a pressure reducing valve is arranged on the first pipeline.

[0010] Beneficial effects of the present invention

[0011] Compared with the prior art, when starting, the bypass solenoid valve is opened, and at the same time, the normally closed solenoid valve for venting is opened, the normally open solenoid valve for venting is opened, and the loading and unloading solenoid valve is closed. At this time, the bypass pipeline and the air intake hole on the butterfly valve plate intake air together, and the internal pressure is quickly established. The air intake volume at the start can be adjusted at will, and the air intake hole on the butterfly valve plate is kept unchanged, so that the air volume or speed of venting can be achieved without increasing. The original technology only increases the air intake hole on the butterfly valve plate, which inevitably increases the air volume of venting or speeds up the venting speed, that is, the throttle hole of venting is increased to achieve the unchanged internal pressure of the oil-gas separator, that is, the balance of the inlet and outlet air volumes; when loading , the bypass solenoid valve is closed, the vent normally closed solenoid valve is closed, and the vent normally open solenoid valve is closed. The loading and unloading solenoid valve is opened to allow the gas in the oil-gas separator to enter the butterfly valve cylinder through the first pipeline. The butterfly valve cylinder controls the butterfly valve plate to open, and air enters the compressor for loading; when unloading, the bypass solenoid valve is closed, the vent normally closed solenoid valve is opened, and the vent normally open solenoid valve is opened, the loading and unloading solenoid valve is closed, and the intake valve butterfly valve plate is closed. Only a small amount of gas enters the compressor from the air intake hole of the butterfly valve plate, and the vent normally closed solenoid valve and the vent normally open solenoid valve are opened at the same time for venting to achieve dual-path venting. These three aspects work together to achieve It effectively ensures that the safety valve will not explode due to overpressure, and the normally closed solenoid valve is divided into two paths after being vented. One path is put in front of the butterfly valve plate through the overflow valve to release the excess gas under overpressure back to the front of the one-way valve plate, and the other path is put back into the main engine, and together with the gas coming in from the air inlet hole on the butterfly valve plate, it passes through the compressor and is discharged to the oil-gas separator. In this way, when unloading, the amount of gas passing through the compressor can be increased to prevent the main engine from making abnormal noises due to excessive vacuum in the unloading state; in the event of emergency stop or fault shutdown, the venting normally closed solenoid valve is closed, the loading and unloading solenoid valve is closed, the bypass solenoid valve is closed, and the venting normally open solenoid valve is opened to slowly release the pressure of the system. That is, the gas in the oil-gas separator is released back to the front side of the butterfly valve plate through the third pipeline, and the internal pressure air is directly released to the oil-gas separator. At the same time, the normally closed solenoid valve is closed because the second pipeline is not emptied. At this time, the emptying speed is changed to emptying through one pipeline (the third pipeline) instead of the second pipeline and the third pipeline during unloading, so as to achieve slower emptying. It can effectively prevent the emergency stop or fault shutdown from being too fast, causing the temperature and pressure of the oil-gas separator to drop quickly, thereby causing oil bubbling, causing the oil bubbles in the oil-gas separator to run from the third pipeline to the air filter, and spit the oil out of the air filter, affecting the use. Thereby, when the compressor is unloaded or shut down for emptying (unload first and then shut down, that is, the oil-gas separator first reduces the internal pressure and then shuts down), the air inlet hole is smaller than the existing one, the emptying speed is low and it is a dual-path emptying, emergency stop emptying or fault shutdown (the oil-gas separator internal pressure does not drop, the oil-gas separator directly shuts down at high pressure) to achieve downshifting and speed reduction for emptying, effectively preventing oil spitting. At the same time, at starting, the air inlet hole is smaller than the existing one, but after increasing the air intake bypass, under the double air inlet holes, it is possible to build up the internal pressure faster than the existing technology, ensuring that the lubricating oil circulates at sufficient pressure.The function of the gas-water separator is that due to the high gas pressure, the gas is converted from high pressure to low pressure when venting, and water can be released, which needs to be separated and discharged to the outside to prevent it from entering the compressor, causing oil emulsification, and damaging the service life of the lubricating oil. After the oil return pressure reducing valve is installed on the secondary oil return pipeline and then passes through the throttle hole, the compressed air volume can be effectively reduced and directly discharged back to the main engine for re-compression, that is, the pressure difference before and after the throttle hole is significantly reduced, thereby reducing the energy consumption of the compressor, especially for high-pressure compressors, the energy saving is more obvious. The present invention is suitable for various compressors with different pressure ranges. BRIEF DESCRIPTION OF THE DRAWINGS

[0012] Figure 1 and Figure 2 It is a schematic diagram of the structure of a venting compressor control system in the prior art;

[0013] Figure 3 It is a schematic diagram of the structure of the present invention;

[0014] Figure 4 It is a schematic diagram of the butterfly valve plate structure;

[0015] Figure 5 Schematic diagram of the intake valve structure.

[0016] Description of the accompanying drawings: 1-compressor, 2-intake valve, 21-butterfly valve cylinder, 22-butterfly valve plate, 221-intake hole, 23-check valve plate, 24-first pipeline, 25-air filter, 26-pressure reducing valve, 27-front hole of butterfly valve plate, 28-front hole of check valve plate, 3-bypass solenoid valve, 31-bypass pipeline, 4-oil-gas separator, 41-oil-gas mixing pipeline, 42-minimum pressure valve, 43-check exhaust valve, 44-safety valve, 45-oil separator core, 5-loading and unloading solenoid valve, 6-emptying normally closed solenoid valve, 61-second pipeline, 62-throttle valve, 63-gas-water separator, 7-emptying normally open solenoid valve, 71-third pipeline, 8-fourth pipeline, 81-overflow valve, 9-secondary oil return pipeline, 91-return oil pressure reducing valve, 92-return oil throttle valve, 93-check valve, 10-primary oil return pipeline, 100-host, 101-intake valve, 102-butterfly valve cylinder, 103-butterfly valve plate, 104-check valve plate, 105-oil-gas separator, 106-loading and unloading solenoid valve, 107-vent valve, 108-pipeline, 109-vent pipe, 110-safety valve, 200-host, 201-intake valve, 202-butterfly valve cylinder, 203-butterfly valve plate, 204-check valve plate, 205-oil-gas separator, 206-loading and unloading solenoid valve, 207-vent normally open solenoid valve, 208-first pipeline, 209-vent pipeline, 220 branch. DETAILED DESCRIPTION

[0017] Figure 3-Figure 5A schematic structural diagram of an embodiment of a low-speed venting compressor control system provided by the present invention comprises a compressor 1, an intake valve 2, a butterfly valve cylinder 21, an oil-gas separator 4, a loading and unloading solenoid valve 5, a venting normally closed solenoid valve 6, and a venting normally open solenoid valve 7. The intake valve 2 is connected to the compressor 1, and a butterfly valve plate 22 is provided at the air inlet of the intake valve 2, and an air inlet hole 221 is provided on the butterfly valve plate 22. A check valve plate 23 is provided at the air outlet of the intake valve 2. The compressor 1 is connected to the oil-gas separator 4 through an oil-gas mixing pipeline 41, and the oil-gas separator 4 is connected to the butterfly valve cylinder 21 through a first pipeline 24. The loading and unloading solenoid valve 5 is provided on the first pipeline 24, and the butterfly valve cylinder 21 is used to control the start and end of the butterfly valve plate 22. The oil-gas separator 4 is connected to the air inlet of the intake valve 2 through the second pipeline 61, and the end of the second pipeline 61 is located at the rear side of the butterfly valve plate 22. The vent normally closed solenoid valve 6 is arranged on the second pipeline 61. The oil-gas separator 4 is connected to the air inlet of the intake valve 2 through the third pipeline 71, and the end of the third pipeline 71 is located at the front side of the butterfly valve plate 22. The vent normally open solenoid valve 7 is arranged on the third pipeline 71. A fourth pipeline 8 is branched off from the second pipeline 61 and connected to the intake valve 2, and the end of the fourth pipeline is located at 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 the second pipeline 61 and the third pipeline 71, and an air-water separator 63 is arranged on the second pipeline 61.

[0018] The intake valve 2 is provided with a butterfly valve plate front hole 27 and a one-way valve plate front hole 28. The end of the fourth pipeline 8 is connected to the front side of the butterfly valve plate 22 through the butterfly valve plate front hole 27, and the end of the second pipeline 61 is connected to the rear side of the butterfly valve plate 22 through the one-way valve plate front hole 28. Figure 3 The direction indicated by the arrow is the direction of fluid flow. According to the direction of fluid flow, the end where the fluid enters the second pipeline 61 is the head end, and the end where the fluid flows out of the second pipeline 61 is the end end. The distinction between the head end and the end end of 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 is the same as that of the second pipeline 61.

[0019] It also includes a bypass solenoid valve 3, which is arranged on a bypass pipeline 31. The two ends of the bypass pipeline 31 are respectively connected to the air inlet and the air outlet of the intake valve 2, and its two ends are respectively located on the front side of the butterfly valve plate 22 and the front side of the one-way valve plate 23.

[0020] It also includes a primary oil return pipeline 10 and a secondary oil return pipeline 9. The two ends of the primary oil return pipeline 10 are respectively connected to the compressor 1 and the oil-gas separator 4. An oil separator core 45 is arranged in the oil-gas separator 4. The two ends of the secondary oil return pipeline 9 are respectively connected to the compressor 1 and the oil separator core 45. The secondary oil return pipeline 9 is provided with an oil return pressure reducing valve 91, an oil return throttle valve 92 and a one-way valve 93.

[0021] A pressure reducing valve 26 is provided on the first pipeline 24 .

[0022] During startup, the bypass solenoid valve 3, the normally closed solenoid valve 6 for venting, and the normally open solenoid valve 7 for venting are opened at the same time, and the loading and unloading solenoid valve 5 is closed. The butterfly valve cylinder 21 controls the butterfly valve plate 22 to close. The air is filtered by the air filter 25 and then enters the compressor 1 from the bypass line 31 through the large-aperture bypass solenoid valve 3 and the air intake hole 221 on the butterfly valve plate 22, so as to quickly build up the internal pressure of the oil-gas separator 4, so that the lubricating oil has sufficient pressure for internal circulation.

[0023] After the start is completed, when entering the loading stage, the bypass solenoid valve 3, the normally closed solenoid valve 6 for venting, and the normally open solenoid valve 7 for venting are closed at the same time, the loading and unloading solenoid valve 5 is opened, and the gas in the oil-gas separator 4 is passed to the butterfly valve cylinder 21 through the first pipeline 24. The butterfly valve cylinder 21 controls the butterfly valve plate 22 to open, and the air enters the compressor 1 from the intake 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 for rough gas-oil separation, and then filtered by the oil separator core 45. The compressed air is discharged from the minimum pressure valve 42, and the residual oil filtered out by the oil separator core 45 is circulated back to the compressor 1 from the secondary oil return pipeline 9.

[0024] When unloading, the loading and unloading solenoid valve 5 is closed, the butterfly valve cylinder 21 controls the butterfly valve plate 22 to be closed, the bypass solenoid valve 3 is closed, a large amount of air no longer enters the compressor 1, and the air intake hole 221 on the butterfly valve plate 22 is retained for air intake; the venting normally closed solenoid valve 6 is energized and opened, and the venting normally open solenoid valve 7 is de-energized and opened, and the compressed air in the oil-gas separator 4 is vented simultaneously through the third pipeline 71, the fourth pipeline 8, and the second pipeline 61, and then returned to the front side of the butterfly valve plate 22 after passing through the third pipeline 71 and adjusting through the venting normally open solenoid valve 7 and the throttle valve 62, and then through the second pipeline 61 and the venting normally closed solenoid valve 6. The gas-water separator 63 is put back to the rear side of the butterfly valve plate 22, and enters the compressor 1 through the one-way valve plate 23 to replenish the compressor 1, so as to obtain sufficient internal circulation gas, so that the compressor 1 does not produce abnormal noise when unloading. The function of the gas-water separator 63 is to separate the water from the air and discharge it outside the compressor 1. When the normally closed electromagnetic valve 6 fails to be emptied or the pressure in the oil-gas separator 4 is high at the moment of venting, the overflow valve 81 opens, and the excess gas of overpressure is returned to the front side of the butterfly valve plate 22 through the fourth pipeline 8, which can prevent too much high-pressure gas from being put into the compressor 1, and prevent oil damage or damage to the compressor 1. The overflow valve 81 can also be replaced by a minimum pressure valve, a safety valve, etc., to achieve the same function.

[0025] Through the adjustment of the throttle valve 62, when the pressure in the system reaches the set minimum pressure during venting, it will no longer drop, so that the air intake and air output of the compressor 1 are balanced, and the system internal pressure is always kept in unloading operation. The bypass solenoid valve 3 is closed and does not work. At this time, only the air intake hole 221 is used for air intake, and the second pipeline 61 and the third pipeline 71 are vented at the same time. Under the three conditions, the venting speed is fast, so that the system internal pressure drops, ensuring that the safety valve 45 does not explode due to excessive pressure in the oil-gas separator 4. The function of the relief valve 81 is to release the excess gas of overpressure back to the front side of the butterfly valve plate 22 through the fourth pipeline 8 through the relief valve 81 when the venting normally closed solenoid valve 6 fails or the oil-gas separator 4 is vented at the moment of unloading due to high pressure, so as to prevent too much high-pressure gas from being put into the compressor 1, effectively preventing the compressor 1 from exceeding the pressure to withstand and bursting the host or preventing the oil seal from leaking due to excessive pressure. By arranging the gas-water separator 63 on the second pipeline 61, when the internal pressure is unloaded and vented, it is prevented that the compressed air changes in pressure and temperature and condensed water is released back into the compressor 1, causing oil damage or compressor damage.

[0026] During loading, the normally open solenoid valve 7 for venting is energized and closed, the normally closed solenoid valve 6 for venting is de-energized and closed, the bypass solenoid valve 3 is closed and does not move, and the loading and unloading solenoid valve 5 is energized and opened to allow the gas in the oil-gas separator 4 to enter the butterfly valve cylinder 21 through the first pipeline 24. The butterfly valve cylinder 21 controls the butterfly valve plate 22 to open, and the air is filtered by the air filter 25 and then enters the compressor 1 from the intake valve 2 for loading.

[0027] In case of emergency stop or shutdown due to fault, the control system is powered off, the normally closed solenoid valve 6 for venting is closed, the loading and unloading solenoid valve 5 is closed, and the bypass solenoid valve 3 is closed. Only the normally open solenoid valve 7 for venting is opened to slowly release the pressure of the system, that is, only the gas in the oil-gas separator 4 is released back to the front side of the butterfly valve plate 22 through the third pipeline 71, and the internal pressure is vented directly to the oil-gas separator 4. At the same time, because the normally closed solenoid valve 6 for venting is closed, the second pipeline 61 is not vented, and the venting is changed from two-way venting to one-way venting, realizing the venting speed shifting venting, and the venting speed is the slowest at this time. For medium and high pressure oil-injected compressors, this can effectively prevent the venting speed from being too fast during emergency stop or shutdown due to fault, causing the oil in the oil-gas separator 4 to bubble, causing the oil in the oil-gas separator 4 to run from the third pipeline 71 to the air filter 25, and spit the oil out of the air filter 25, affecting customer use.

[0028] In summary, when starting, the bypass solenoid valve 3 is opened, and at the same time, the normally closed solenoid valve 6 for venting is opened, the normally open solenoid valve 7 for venting is opened, and the loading and unloading solenoid valve 5 is closed. At this time, the bypass pipeline 31 and the air inlet hole 221 of the butterfly valve plate 22 are jointly inlet. The air inlet hole 221 is smaller than the existing one. By adding the air inlet bypass solenoid valve 3, the air inlet hole 221 and the bypass solenoid valve 3 are double-inlet, and the internal pressure is quickly established. The air intake volume at the time of starting can be adjusted at will through the bypass solenoid valve 3, and the air intake hole 221 on the butterfly valve plate 22 is kept unchanged, so that the air volume of venting can be achieved without increasing. Or speed, the prior art has only to increase the air inlet hole 221 on the butterfly valve plate 22, which will inevitably increase the amount of gas to be vented or speed up the venting speed, that is, to increase the throttle hole for venting, so as to achieve the unchanged internal pressure of the oil-gas separator 4, that is, the balance of the inlet and outlet air volumes; when the motor of the compressor 1 completes the star-delta conversion, or after a set time delay, the controller issues a loading command, the bypass solenoid valve 3 is closed, the venting normally closed solenoid valve 6 is closed, and the venting normally open solenoid valve 7 is closed, and at the same time the loading and unloading solenoid valve 5 is opened, and the butterfly valve cylinder 21 is opened to control the butterfly valve plate 22 to open for loading.

[0029] Repeating the above starting, unloading, shutting down or emergency stop, etc., makes the machine suitable for more working conditions and meets the use requirements. It can realize low-speed emptying under multiple operating conditions, realize emptying speeds of different gears for unloading and emergency stop (fault shutdown), prevent the problem of oil leakage during emptying, and quickly build up system pressure during starting. At the same time, the main engine is effectively protected by the overflow valve 81, and the compressor 1 is replenished with air when the normally closed solenoid valve 6 is unloaded by emptying, which effectively prevents the compressor 1 from making abnormal noise due to high vacuum when unloading. The secondary return oil pipeline 9 is decompressed by the return oil pressure reducing valve 91, which effectively prevents excessive flow of compressed air to achieve energy-saving effect.

[0030] The above detailed description is a specific description of a feasible embodiment of the present invention. The embodiment is not intended to limit the patent scope of the present invention. Any equivalent implementation or modification that does not deviate from the present invention should be included in the patent scope of this case.

Claims

1. A low-speed blowdown compressor control system, characterized in that: The invention comprises a compressor, an air intake valve, a butterfly valve cylinder, an oil-gas separator, a loading and unloading solenoid valve, a normally closed solenoid valve for venting, and a normally open solenoid valve for venting. The air intake valve is connected to the compressor. A butterfly valve plate is provided at the air intake of the air intake valve. An air intake hole is provided on the butterfly valve plate. A one-way valve plate is provided at the air outlet of the air intake valve. The compressor is connected to the oil-gas separator through an oil-gas mixing pipeline. The oil-gas separator is connected to the butterfly valve cylinder through a first pipeline. The loading and unloading solenoid valve is provided on the first pipeline. The butterfly valve cylinder is used to control the opening and closing of the butterfly valve plate. The oil-gas separator The air inlet of the air inlet valve is connected to the air inlet port of the air inlet valve through a second pipeline, and the end of the second pipeline is located at the rear side of the butterfly valve plate. The vent normally closed solenoid valve is arranged on the second pipeline, and a gas-water separator is arranged on the second pipeline. The oil-gas separator is connected to the air inlet port of the air inlet valve through a third pipeline, and the end of the third pipeline is located at the front side of the butterfly valve plate. The vent normally open solenoid valve is arranged on the third pipeline. A fourth pipeline is branched from the second pipeline and connected to the air inlet valve, and the end of the fourth pipeline is located at the front side of the butterfly valve plate. A relief valve is arranged on the fourth pipeline; It also includes a secondary oil return pipeline. An oil separator core is arranged in the oil-gas separator. The two ends of the secondary oil return pipeline are respectively connected to the compressor and the oil separator core. The secondary oil return pipeline is provided with an oil return pressure reducing valve, an oil return throttle valve and a one-way valve.

2. A low-speed blowdown compressor control system according to claim 1, characterized in that: It also includes a bypass solenoid valve, which is arranged on a bypass pipeline. The two ends of the bypass pipeline are respectively connected to the air inlet and the air outlet of the intake valve, and the two ends are respectively located on the front side of the butterfly valve plate and the front side of the one-way valve plate.

3. A low-speed blowdown compressor control system according to claim 2, characterized in that: It also includes a primary oil return pipeline, with two ends of the primary oil return pipeline connected to the compressor and the oil-gas separator respectively.

4. A low-speed blowdown compressor control system according to claim 1, characterized in that: The second pipeline and the third pipeline are both provided with throttle valves.

5. A low-speed blowdown compressor control system according to any one of claims 1 to 4, characterized in that: The first pipeline is provided with a pressure reducing valve.

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