CN107939660B - Stepless air quantity regulating system of reciprocating compressor - Google Patents
Stepless air quantity regulating system of reciprocating compressor Download PDFInfo
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- CN107939660B CN107939660B CN201711178317.4A CN201711178317A CN107939660B CN 107939660 B CN107939660 B CN 107939660B CN 201711178317 A CN201711178317 A CN 201711178317A CN 107939660 B CN107939660 B CN 107939660B
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- 230000001105 regulatory effect Effects 0.000 title claims abstract description 42
- 239000003921 oil Substances 0.000 claims description 204
- 238000007789 sealing Methods 0.000 claims description 175
- IJGRMHOSHXDMSA-UHFFFAOYSA-N Atomic nitrogen Chemical compound N#N IJGRMHOSHXDMSA-UHFFFAOYSA-N 0.000 claims description 162
- 229910052757 nitrogen Inorganic materials 0.000 claims description 84
- 230000007246 mechanism Effects 0.000 claims description 43
- 239000007789 gas Substances 0.000 claims description 31
- 239000010720 hydraulic oil Substances 0.000 claims description 21
- 230000001276 controlling effect Effects 0.000 claims description 17
- 239000007788 liquid Substances 0.000 claims description 17
- 230000003068 static effect Effects 0.000 claims description 16
- 238000000034 method Methods 0.000 claims description 10
- 230000009471 action Effects 0.000 claims description 9
- 230000008569 process Effects 0.000 claims description 8
- 230000001360 synchronised effect Effects 0.000 claims description 6
- 229920000049 Carbon (fiber) Polymers 0.000 claims description 3
- 229910000831 Steel Inorganic materials 0.000 claims description 3
- 230000004888 barrier function Effects 0.000 claims description 3
- 239000004917 carbon fiber Substances 0.000 claims description 3
- VNTLIPZTSJSULJ-UHFFFAOYSA-N chromium molybdenum Chemical compound [Cr].[Mo] VNTLIPZTSJSULJ-UHFFFAOYSA-N 0.000 claims description 3
- 238000001514 detection method Methods 0.000 claims description 3
- QJGQUHMNIGDVPM-UHFFFAOYSA-N nitrogen group Chemical group [N] QJGQUHMNIGDVPM-UHFFFAOYSA-N 0.000 claims description 3
- -1 polytetrafluoroethylene Polymers 0.000 claims description 3
- 229920001343 polytetrafluoroethylene Polymers 0.000 claims description 3
- 239000004810 polytetrafluoroethylene Substances 0.000 claims description 3
- 239000010959 steel Substances 0.000 claims description 3
- 230000002159 abnormal effect Effects 0.000 claims description 2
- 238000007790 scraping Methods 0.000 claims description 2
- 238000012544 monitoring process Methods 0.000 abstract description 7
- 238000010586 diagram Methods 0.000 description 5
- 239000012530 fluid Substances 0.000 description 4
- 238000003780 insertion Methods 0.000 description 3
- 230000037431 insertion Effects 0.000 description 3
- 230000008859 change Effects 0.000 description 2
- 230000003749 cleanliness Effects 0.000 description 2
- 238000005516 engineering process Methods 0.000 description 2
- 238000005299 abrasion Methods 0.000 description 1
- 230000006835 compression Effects 0.000 description 1
- 238000007906 compression Methods 0.000 description 1
- 238000013461 design Methods 0.000 description 1
- 229910001873 dinitrogen Inorganic materials 0.000 description 1
- 238000006073 displacement reaction Methods 0.000 description 1
- 239000000428 dust Substances 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 238000004134 energy conservation Methods 0.000 description 1
- 238000005265 energy consumption Methods 0.000 description 1
- 238000001125 extrusion Methods 0.000 description 1
- 239000012535 impurity Substances 0.000 description 1
- 238000005461 lubrication Methods 0.000 description 1
- 238000004519 manufacturing process Methods 0.000 description 1
- 239000000463 material Substances 0.000 description 1
- 238000005259 measurement Methods 0.000 description 1
- 239000004576 sand Substances 0.000 description 1
- 239000002699 waste material Substances 0.000 description 1
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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
- 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
- F04B49/065—Control using electricity and making use of computers
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Abstract
The invention relates to the technical field of compressor air quantity adjustment, and particularly discloses a stepless air quantity adjustment system of a reciprocating compressor. The gas quantity regulating system has fault monitoring function and redundancy function, ensures the reliability and safety of the system, and saves energy to the maximum extent on the basis of realizing the stepless regulating function of the gas quantity of the reciprocating compressor.
Description
Technical Field
The invention belongs to the technical field of compressor air quantity adjustment, and particularly relates to a stepless air quantity adjustment system of a reciprocating compressor.
Background
The reciprocating compressor is a positive displacement compressor, and has air inlet valve and air outlet valve on the cylinder, and when the piston in the cylinder makes circular reciprocating motion, the volume in the cylinder changes periodically, and under the combined action of the air inlet valve and the air outlet valve, the expansion, air suction, compression and air discharge of the air are realized.
The reciprocating compressor is an important device in the energy industry, and under normal conditions, the outlet flow of the compressor is basically unchanged, but the gas consumption of the compressor is changed frequently along with the change of process requirements in production, so that the gas consumption of the compressor needs to be regulated within a certain range, and the gas consumption meets the process requirements of the gas consumption on site.
The traditional air quantity adjusting mode of the reciprocating compressor comprises the following steps: speed regulation, clearance regulation, bypass regulation, full-stroke top-open intake valve regulation and partial-stroke top-open intake valve regulation. Rotational speed adjustment is not applicable to large reciprocating compressors. The clearance adjustment has poor reliability and requires more human intervention. The bypass adjustment can realize stepless adjustment of the gas quantity, meets the requirements of on-site processes, but has serious energy consumption waste. The full-stroke top-open air inlet valve can only realize gas quantity stepping adjustment and cannot realize continuous adjustment. Partial stroke top-open air inlet valve can realize continuous adjustment of air quantity and save energy, but the technology is still immature. The most widely used adjustment methods are currently also bypass adjustments.
The large reciprocating compressor is applied to the process industry, belongs to heart equipment of factories, and is required to stop in continuous operation, otherwise, great economic loss is caused. Currently, in order to realize energy saving and air quantity adjustment, a domestic patent already proposes an air quantity stepless adjustment system based on a partial stroke top-open air inlet valve. However, there are still many problems in use, which limit the application of this technology in industry. The specific problems are as follows: 1. life problem: such as solenoid valve life problems and hydraulic cylinder life problems in the actuators; 2. the fault monitoring and countermeasure of the regulating system are insufficient: for example, monitoring the consistency of the compressor duty cycle with the control cycle of the regulation system, monitoring the temperature, pressure and level of hydraulic oil in the hydraulic system and monitoring the temperature of the inlet valve; 3. the safety protection measures after the failure of the control system are insufficient: for example, when the control system fails, the regulating system takes any measures to ensure that the on-site reciprocating compressor operates normally.
Therefore, the gas quantity regulating system which can realize continuous regulation of the gas quantity of the reciprocating compressor, furthest saves energy sources, has high safety and strong reliability, and can not influence the normal operation of the on-site compressor after the regulating system fails, and becomes urgent need of some industries.
Disclosure of Invention
The invention aims to provide a stepless air quantity regulating system of a reciprocating compressor, which realizes the air quantity regulation of the reciprocating compressor, saves energy to the maximum extent, has fault monitoring and redundancy functions, and ensures the safety and the service life of the system.
The technical scheme of the invention is as follows:
a stepless air quantity regulating system of a reciprocating compressor is used for the reciprocating compressor, the reciprocating compressor comprises a compressor main motor, a compressor flywheel, a compressor cylinder and a compressor air inlet valve, a piston is arranged in the compressor cylinder, and an upper dead point sensor is arranged on one side of the compressor flywheel;
the upper dead point sensor is used for collecting the upper dead point position information of the compressor, and the CPU module calculates the synchronous period of the compressor according to the signal, so as to determine the starting time and the jacking duration of a signal for controlling the jacking of the air inlet valve of the compressor;
the air quantity stepless regulation system comprises a control system, a mechanical actuating mechanism and a hydraulic system;
the control system comprises a CPU module, an output module and an input module, wherein the input module is used for receiving signals, the CPU module is used for sending control instructions, and the output module is used for controlling the mechanical executing mechanism to act;
the power supply of the control system is a redundant power supply, and the redundant power supply adopts a three-bus circuit structure of an input bus, a load bus and a shared bus;
the mechanical actuating mechanism is fixed on a valve hole cover of the air inlet valve of the compressor through a bolt and comprises an electromagnetic valve, a hydraulic cylinder, a nitrogen sealing device and a temperature sensor;
the electromagnetic valve is arranged above the hydraulic cylinder and is fixedly connected with the hydraulic cylinder through four fastening screws;
the electromagnetic valve is provided with a port A, a port P and a port T; when the port A is communicated with the port P, an oil inlet passage P-A is formed; when the port A is communicated with the port T, an oil return passage A-T is formed;
the hydraulic cylinder comprises an upper cylinder body, a lower cylinder body, a piston sleeve, a piston rod, a hydraulic rod, a first sealing guide support, a second sealing guide support, a third sealing guide support and an oil scraper ring support;
the upper cylinder body is arranged above the lower cylinder body, and the upper cylinder body and the lower cylinder body are fixedly connected through an inner hexagonal cylindrical head screw;
a rodless cavity A and a rod cavity B are arranged in the upper cylinder body, and the rodless cavity A and the rod cavity B are coaxial;
an O-shaped ring I is arranged at the joint of the upper cylinder body and the lower cylinder body, so that axial static seal is realized, and the leakage of oil in the rod cavity B is prevented;
the upper end surface of the upper cylinder body is provided with a working oil port which is communicated with the through port A and the rodless cavity A;
an oil inlet and an oil outlet are arranged on the side surface of the upper cylinder body, wherein the oil inlet is communicated with the through hole P, and the oil outlet is communicated with the through hole T;
an inserting through hole is axially formed in the upper cylinder body and the lower cylinder body, and a threaded inserting type temperature sensor is arranged in the inserting through hole;
the piston is sleeved in the rodless cavity A and is connected with the upper cylinder body through threads;
a high-pressure sealing ring is arranged at the joint of the piston sleeve and the upper cylinder body to form static seal;
one end of the piston rod is arranged in the piston sleeve, a gap exists between the piston rod and the piston sleeve, and the other end of the piston rod is positioned in the rod cavity B;
an annular balance groove is formed in the outer side of the piston rod, vortex is formed in the groove when oil flows through the balance groove, so that the oil is converted from a laminar state to a turbulent mixing state, and a resistance barrier is formed;
an oil drain port and a gas drain port are arranged on the side surface of the lower cylinder body, and the oil drain port can guide the leakage oil at the sealing position of the piston gap back to the oil tank;
a first sealing guide support, a second sealing guide support and a third sealing guide support are sequentially arranged in the lower cylinder body from top to bottom, and three radial static seals are respectively formed between the first sealing guide support, the second sealing guide support and the inner wall of the lower cylinder body through three O-shaped rings II;
the sealing guide support I, the sealing guide support II and the sealing guide support III are hollow cylindrical, and are coaxial;
an annular sealing cavity C is arranged in the sealing guide support II and is communicated with the air leakage port;
the inner wall of the sealing guide support I is provided with a groove I and a guide groove I, the combined sealing ring I is arranged in the groove I, and the guide belt I is arranged in the guide groove I;
a groove II and a groove III are formed in the inner wall of the sealing guide support II, the combined sealing ring II is arranged in the groove II, and the combined sealing ring III is arranged in the groove III;
a groove IV and a guide groove II are arranged on the inner wall of the sealing guide support III, the combined sealing ring IV is arranged in the groove IV, and the guide belt II is arranged in the guide groove II;
the first guide belt and the second guide belt are used for righting the hydraulic rod;
the side wall of the sealing guide support II is provided with an air leakage hole which is communicated with the air leakage hole on the side surface of the lower cylinder body;
the oil scraper ring is supported at the outlet of the lower part of the lower cylinder body and is connected with the lower cylinder body through threads;
the nitrogen seal device is arranged below the lower cylinder body and comprises a nitrogen seal oil scraper ring support, a nitrogen seal device connecting frame and a nitrogen seal guide support;
the nitrogen seal oil scraper ring support, the nitrogen seal device connecting frame and the nitrogen seal guide support are hollow structures and are coaxial;
an O-shaped ring IV is arranged between the nitrogen sealing device connecting frame and the lower cylinder body, the nitrogen sealing device connecting frame is fixedly connected with the lower cylinder body through a fastening screw, the O-shaped ring IV is pressed to form an axial static seal, and an air cavity D is arranged in the nitrogen sealing device connecting frame;
the nitrogen seal oil scraper ring is supported below the nitrogen seal device connecting frame and is connected with the nitrogen seal oil scraper ring through threads;
the nitrogen seal sealing guide support is arranged in the nitrogen seal device connecting frame;
an O-shaped ring III is arranged at the joint of the nitrogen seal guide support and the nitrogen seal device connecting frame to form static seal;
one end of the hydraulic rod is positioned in the rod cavity B, is contacted with one end of the piston rod, and the other end of the hydraulic rod passes through the first sealing guide support, the first sealing cavity C, the second sealing guide support, the third sealing guide support, the oil scraper ring support, the nitrogen sealing device connecting frame, the nitrogen sealing guide support and the nitrogen sealing oil scraper ring support and then is positioned below the nitrogen sealing device;
a combined sealing ring V is arranged at the joint of the oil scraper ring support and the hydraulic rod, and a combined sealing ring V is arranged at the joint of the nitrogen seal oil scraper ring support and the hydraulic rod;
a combined sealing ring six, a combined sealing ring seven, a guiding belt three and a guiding belt four are arranged at the joint of the nitrogen seal guiding support and the hydraulic rod and used for separating nitrogen in the air cavity D from a process medium in the cylinder of the reciprocating compressor;
an inflation inlet is arranged on the side wall of the nitrogen sealing device connecting frame and is used for inflating nitrogen with certain pressure into the air cavity D;
the unloading device is arranged on the air inlet valve of the compressor, and the unloading reset spring is arranged in the unloading device and can act on the piston rod to reset the piston rod;
the hydraulic system comprises an oil inlet pipeline, an oil return pipeline, an oil leakage pipeline, a filter, a hydraulic oil station motor, a pressure transmitter, a liquid level switch and a temperature transmitter;
one end of the oil inlet pipeline and one end of the oil return pipeline are respectively communicated with the oil station, and a branch is arranged on the oil return pipeline and used as an oil leakage pipeline; the other end of the oil inlet pipeline is connected with an oil inlet in the mechanical actuating mechanism, the other end of the oil leakage pipeline is connected with an oil drain port in the mechanical actuating mechanism, and the other end of the oil return pipeline is connected with an oil outlet of the mechanical actuating mechanism;
the two filters are respectively arranged on the oil inlet pipeline and the oil return pipeline;
the hydraulic oil station motor is arranged at the upper part of the oil station and can drive an internal gear pump of the oil station to provide high-pressure hydraulic oil for the mechanical actuating mechanism;
one end of the pressure transmitter is connected with the oil inlet pipeline, and the other end of the pressure transmitter is communicated with the control system and is used for measuring the oil pressure in the oil inlet pipeline and transmitting an oil pressure signal to the control system;
one end of the liquid level switch is connected with the oil station, and the other end of the liquid level switch is communicated with the control system and is used for detecting the liquid level of oil in the oil station and transmitting a liquid level signal to the control system;
one end of the temperature transmitter is connected with the oil station, and the other end of the temperature transmitter is communicated with the control system and is used for measuring the temperature of oil in the oil station and transmitting an oil temperature signal to the control system;
the control system controls the opening and closing of the electromagnetic valve in the mechanical actuating mechanism, and further controls the opening and closing of the hydraulic cylinder, so that the air quantity adjustment of the compressor is realized.
The first combined sealing ring, the second combined sealing ring, the third combined sealing ring, the fourth combined sealing ring, the fifth combined sealing ring, the sixth combined sealing ring, the seventh combined sealing ring and the eighth combined sealing ring are composed of O-shaped rings and slip rings.
The redundant power supply comprises a power supply 1 and a power supply 2 which are hot plug power supply modules, wherein the power supply 1 and the power supply 2 are connected in parallel, C1 and C2 are control modules of the power supplies, S1 and S2 are controlled current regulators, SENSE1 and SENSE2 are power supply detection signals, and FB is a load voltage feedback signal;
when the system works normally, the control module enables the system to use each power module in a balanced mode by adjusting the conduction degree of the current regulator, each power module provides the same current for the system, when one power fails, the current regulator is cut off, the failed power is isolated from the power system, and fault alarm is carried out.
The two filters are redundant filters which are all 'one-on-one-standby', and an electromagnetic switch valve is arranged at the front end of each filter.
The hydraulic system supplies high-pressure hydraulic pressure to the mechanical actuating mechanism through the oil inlet pipeline, and returns oil in the mechanical actuating mechanism to the oil station through the return pipeline and the oil leakage pipeline, so that the oil can be recycled.
The piston rod and the piston sleeve are made of chromium-molybdenum steel, and have hardness difference; the slip ring is made of polytetrafluoroethylene containing carbon fibers.
After receiving the signal of the upper dead point sensor, the CPU module calculates the synchronous period and the upper dead point position of the compressor according to the signal, then determines the starting time of the signal for controlling the top opening of the air inlet valve of the compressor according to the synchronous period and the upper dead point position, then calculates according to the load of the compressor and the actual measurement value of the exhaust pressure, and determines the duration of the signal for controlling the top opening of the air inlet valve of the compressor;
when the output module outputs a signal for controlling the top-opening of the air inlet valve of the compressor, the inside of the electromagnetic valve in the mechanical actuating mechanism is switched to a P-A passage, the hydraulic system acts high-pressure hydraulic oil in the oil station on the mechanical actuating mechanism, the hydraulic cylinder is opened, and the air inlet valve of the compressor is opened; when the duration of controlling the top opening of the air inlet valve of the compressor is reached, the control system outputs a signal for controlling the air inlet of the compressor to reset, the inside of the electromagnetic valve in the mechanical actuating mechanism is switched to an A-T passage, hydraulic oil flows back to the oil station through an oil return pipeline, the hydraulic cylinder is closed, and the air inlet valve of the compressor is closed.
The control system can also monitor the temperature, the liquid level and the pressure of oil in the hydraulic system by sending alarm signals, detect faults of starting and overload of a motor of the hydraulic oil station and set alarm for filters on an oil inlet pipeline and an oil return pipeline of the hydraulic system;
the alarm signals comprise a common alarm signal and a fault alarm signal;
when the common alarm signal appears, the staff can selectively make corresponding measures according to the specific conditions of the site; when a fault alarm signal appears, the control system can send out an interlocking signal to cut off the air quantity regulating system, and workers can throw in the air quantity regulating system again after necessary measures are taken to eliminate the fault.
When the temperature value measured by the temperature sensor exceeds the normal range, the abnormal operation of the compressor air inlet valve is indicated, and the control system can send out a fault alarm signal for the overhigh gas temperature of the compressor air inlet valve and stop the motor of the hydraulic oil station in an interlocking way;
the air quantity regulating system utilizes the top dead center position signal received by the top dead point sensor to transmit to the control system, and the control system calculates the control period in real time according to the signal; when the cycle value calculated by the control system is smaller than T/2 or larger than 3T/2 in 5 compressor working cycles continuously, T is the rated working cycle of the compressor, the regulating system can be automatically cut off, and the air quantity of the reciprocating compressor is regulated by the original regulating mode.
When the control system fails, the control signal is not output any more, the electromagnetic valve in the mechanical actuating mechanism can not receive the control signal, the valve core of the electromagnetic valve is automatically reset to a safe position under the action of the spring in the valve, the oil inlet passage of the electromagnetic valve is closed in the safe position, the through opening A of the electromagnetic valve is connected with the through opening T, the hydraulic cylinder is connected with the through opening A of the electromagnetic valve, the pressure is relieved immediately, the piston rod of the hydraulic cylinder can be reset under the action of the unloading reset spring, after the piston rod is reset, the opening and closing of the air inlet valve of the compressor is not influenced by the action of the hydraulic cylinder any more, the opening and closing of the air inlet valve of the compressor is controlled only by the pressure difference of the inlet and outlet of the air inlet valve of the compressor, the reciprocating compressor is restored to a full-air-volume working state, and the air volume and energy conservation of the compressor can not be regulated at the moment, but the safe and reliable normal operation of the reciprocating compressor can not be influenced.
The invention has the remarkable effects that:
the gas quantity regulating system has fault monitoring function and redundancy function, ensures the reliability and safety of the system, and saves energy to the maximum extent on the basis of realizing the stepless regulating function of the gas quantity of the reciprocating compressor.
The gas quantity regulating system also has the functions of regulating the interstage pressure and protecting the mechanical safety, and even if the control system fails, the safe and reliable normal operation of the reciprocating compressor is not affected.
Drawings
Fig. 1: a gas quantity regulating system structure diagram;
fig. 2: redundant power supply structure diagrams;
fig. 3: schematic diagram of the left side of the mechanical actuator;
fig. 4: schematic diagram of the right side of the mechanical actuator;
fig. 5: a mechanical actuating mechanism and a compressor air inlet valve are formed;
fig. 6: a hydraulic cylinder schematic;
fig. 7: a sealing structure schematic diagram of a lower cylinder body of the hydraulic cylinder;
fig. 8: an enlarged structure is shown at I in fig. 7.
In the figure: 1-an electromagnetic valve; 2-a hydraulic cylinder; 3-nitrogen sealing device; 4-a temperature sensor; 5-an upper cylinder; 6-a lower cylinder; 7-a piston sleeve; 8-a piston rod; 9-a hydraulic rod; 10-sealing guide support I; 11-sealing guide support II; 12-sealing guide support III; 13-oil scraper ring support; 14-oil inlet; 15, a working oil port; 16-an oil outlet; 17-an oil drain port; 18-hexagon socket head cap screw; 19-fastening a screw; 20-a high-pressure sealing ring; 21-O-ring I; a second 22-O-shaped ring; a 23-O-ring; 24-slip rings; 25-a first guide belt; 26-a combined sealing ring I; 27-a second combined sealing ring; 28-a combined sealing ring III; 29-a combined sealing ring IV; 30-combining a sealing ring V; 31-a second guide belt; 32-a combined sealing ring six; 33-a combined sealing ring seven; 34-a third guide belt; 35-a guide belt IV; 36-a gas leakage port; 37-combined sealing ring eight; 38-nitrogen seal oil scraper ring support; 39-nitrogen sealing device connection frame; 40-nitrogen seal sealing guide support; 41-an inflation inlet; 42-O-shaped ring III; a 43-O-shaped ring IV; 44-a filter; 45-a hydraulic oil station motor; 46-a pressure transmitter; 47-level switch; 48-a CPU module; 49-an output module; 50-an input module; 51-compressor main motor; 52-upper dead point sensor; 53-compressor flywheel; 54-compressor cylinder; 55-piston; 56-compressor inlet valve; 57-unloading reset spring; 58-redundant power supply; 59-temperature transmitter.
Detailed Description
The invention will be described in further detail with reference to the accompanying drawings and specific examples.
As shown in fig. 1, a stepless air quantity regulating system of a reciprocating compressor is used for the reciprocating compressor, and the reciprocating compressor comprises a compressor main motor 51, a compressor flywheel 53, a compressor cylinder 54 and a compressor air inlet valve 56. A piston 55 is provided in the compressor cylinder 54, and an upper dead point sensor 52 is provided on one side of the compressor flywheel 53.
The upper dead point sensor 52 is used to collect the information of the top dead point of the compressor, and the CPU module 48 calculates the synchronization period of the compressor according to the signal, so as to determine the starting time and the duration of the signal for controlling the opening of the air inlet valve 56 of the compressor.
The stepless air volume regulating system comprises a control system, a mechanical executing mechanism and a hydraulic system.
The control system comprises a CPU module 48, an output module 49 and an input module 50, wherein signals are received through the input module 50, a control instruction is sent out through the CPU module 48, and the action of a mechanical executing mechanism is controlled through the output module 49.
As shown in fig. 2, the power supply of the control system is a redundant power supply 58, and the redundant power supply 58 adopts a three-bus circuit structure of an input bus, a load bus and a shared bus. The power supply 1 and the power supply 2 are hot plug power supply modules which are connected in parallel, C1 and C2 are control modules of the power supplies, S1 and S2 are controlled current regulators, SENSE1 and SENSE2 are power supply detection signals, and FB is a load voltage feedback signal. When the system works normally, the control module enables the system to use each power module in a balanced mode by adjusting the conduction degree of the current regulator, each power module provides the same current for the system, when one power fails, the current regulator is cut off, the failed power is isolated from the power system, and fault alarm is carried out. This design may improve the reliability of the control system.
The mechanical actuator shown in fig. 3 to 5 is fixed on the valve hole cover of the compressor air inlet valve 56 by bolts, and comprises an electromagnetic valve 1, a hydraulic cylinder 2, a nitrogen sealing device 3 and a temperature sensor 4.
The electromagnetic valve 1 is arranged above the hydraulic cylinder 2 and is fixedly connected with the hydraulic cylinder 2 through four fastening screws 19. The solenoid valve 1 is provided with a port a, a port P and a port T. The solenoid valve 1 can be selected from various commercial products meeting the requirements of the invention. When the port A is communicated with the port P, an oil inlet passage P-A is formed; and when the port A is communicated with the port T, an oil return passage A-T passage is formed.
As shown in fig. 6, the hydraulic cylinder 2 includes an upper cylinder body 5, a lower cylinder body 6, a piston sleeve 7, a piston rod 8, a hydraulic rod 9, a seal guide support one 10, a seal guide support two 11, a seal guide support three 12 and a scraper ring support 13.
The upper cylinder body 5 is arranged above the lower cylinder body 6, and the upper cylinder body and the lower cylinder body are fixedly connected through an inner hexagonal cylindrical head screw 18. A rodless cavity A and a rod-containing cavity B are arranged in the upper cylinder body 5, and the rodless cavity A and the rod-containing cavity B are coaxial. An O-shaped ring I21 is arranged at the joint of the upper cylinder body 5 and the lower cylinder body 6, so that axial static seal is realized, and the leakage of oil in the rod cavity B is prevented.
An oil port 15 is arranged on the upper end surface of the upper cylinder body 5 and is communicated with the through port A and the rodless cavity A. An oil inlet 14 and an oil outlet 16 are arranged on the side face of the upper cylinder body 5, wherein the oil inlet 14 is communicated with the through hole P, and the oil outlet 16 is communicated with the through hole T.
An insertion through hole is axially formed in the upper cylinder body 5 and the lower cylinder body 6, and a threaded insertion type temperature sensor 4 is installed in the insertion through hole and is used for measuring the temperature of the three O-shaped rings 22 and the temperature of gas in the compressor cylinder.
The piston sleeve 7 is arranged in the rodless cavity A and is connected with the upper cylinder body 5 through threads, and a high-pressure sealing ring 20 is arranged at the joint of the piston sleeve 7 and the upper cylinder body 5 to form static seal. One end of the piston rod 8 is arranged in the piston sleeve 7, a gap exists between the piston rod and the piston sleeve, and the other end of the piston rod 8 is positioned in the rod cavity B. In the action process of the hydraulic cylinder 2, the piston sleeve 7 and the piston rod 8 move mutually, and the leakage quantity is controlled by reasonably designing the length and the width of the gap so as to achieve the aim of sealing. When high-pressure oil flows through the gap, an oil film is formed, and lubrication and supporting functions can be achieved. The piston rod 8 and the piston sleeve 7 are made of materials with small dynamic and static friction coefficients, large hardness and certain hardness difference, such as chromium-molybdenum steel.
The outside of piston rod 8 is equipped with annular balance groove, and when fluid flowed through the balance groove, can form the vortex in the groove, makes fluid change from laminar state to turbulent mixing state and forms the resistance barrier to form the throttle to fluid, and make it produce as big pressure loss as possible, reduce the leakage. Because of errors in the geometric shape and coaxiality of the parts, working high-pressure oil is asymmetrically distributed in the sealing gap to form hydraulic clamping force, and friction force between dynamic sealing pairs is increased. Through setting up the balancing tank for radial oil pressure that acts on the piston rod 8 outside tends to balance, and piston rod 8 and piston sleeve 7 can be automatic centering, because concentric ring seam leak is more than eccentric ring seam little, and the centering of sealed vice part can also reduce the leakage quantity of fluid, further improves sealing performance.
An oil drain port 17 and an air drain port 36 are arranged on the side face of the lower cylinder body 6, and the oil drain port 17 can guide the leaked oil at the sealing position of the piston gap back to the oil tank.
The lower cylinder body 6 is internally provided with a first sealing guide support 10, a second sealing guide support 11 and a third sealing guide support 12 from top to bottom in sequence, and three radial static seals are respectively formed with the inner wall of the lower cylinder body 6 through three second O-shaped rings 22. The sealing guide support I10, the sealing guide support II 11 and the sealing guide support III 12 are hollow cylindrical shapes and coaxial.
An annular sealing cavity C is arranged in the sealing guide support II 11 and is communicated with the air leakage port 36.
As shown in fig. 7 and 8, a groove one and a guide groove one are formed in the inner wall of the seal guide support one 10, a combined seal ring one 26 is arranged in the groove one, and a guide belt one 25 is arranged in the guide groove one. The inner wall of the sealing guide support II 11 is provided with a groove II and a groove III, the combined sealing ring II 27 is arranged in the groove II, and the combined sealing ring III 28 is arranged in the groove III. The inner wall of the sealing guide support three 12 is provided with a groove four and a guide groove two, the combined sealing ring four 29 is arranged in the groove four, and the guide belt two 31 is arranged in the guide groove two. The first guide belt 25 and the second guide belt 31 are used for righting the hydraulic rod 9.
And a gas leakage hole is arranged on the side wall of the second sealing guide support 11 and is communicated with a gas leakage hole 36 on the side surface of the lower cylinder body 6, so that gas leaked from the second combined sealing ring 27, the third combined sealing ring 28 and the fourth combined sealing ring 29 and residual oil leaked from the first combined sealing ring 26 can be recovered.
The slip ring 24 is made of polytetrafluoroethylene containing carbon fibers, and has the advantages of low friction coefficient, high wear resistance and extrusion resistance and good sealing performance. The compressive elastic counter force of the O-ring 23 provides the sliding sealing surface of the slip ring 24 with additional compressive stress necessary to ensure sealing.
The oil scraper ring support 13 is arranged at the lower outlet of the lower cylinder body 6 and is connected with the lower cylinder body 6 through threads.
The nitrogen sealing device 3 is arranged below the lower cylinder body 6 and comprises a nitrogen sealing oil scraping ring support 38, a nitrogen sealing device connecting frame 39 and a nitrogen sealing guiding support 40. The nitrogen seal oil scraper ring support 38, the nitrogen seal device connecting frame 39 and the nitrogen seal guide support 40 are hollow structures and coaxial. The nitrogen sealing device connecting frame 39 is fixedly connected with the lower cylinder body 6 through a fastening screw, meanwhile, the O-shaped ring IV 43 is pressed to form an axial static seal, and an air cavity D is arranged in the nitrogen sealing device connecting frame 39.
The nitrogen seal oil scraper ring support 38 is arranged below the nitrogen seal device connecting frame 39, and the nitrogen seal oil scraper ring support and the nitrogen seal oil scraper ring are connected through threads.
The nitrogen seal guiding support 40 is arranged in the nitrogen seal device connecting frame 39, and an O-shaped ring III 42 is arranged at the joint of the nitrogen seal guiding support 40 and the nitrogen seal device connecting frame 39 to form static seal.
One end of the hydraulic rod 9 is positioned in the rod cavity B and is contacted with one end of the piston rod 8, and the other end passes through the sealing guide support I10, the sealing cavity C, the sealing guide support II 11, the sealing guide support III 12, the oil scraper ring support 13, the nitrogen sealing device connecting frame 39, the nitrogen sealing guide support 40 and the nitrogen sealing oil scraper ring support 38 and then is positioned below the nitrogen sealing device 3.
The combined sealing ring V30 is arranged at the matching position of the oil scraper ring support 13 and the hydraulic rod 9, the combined sealing ring V37 is arranged at the matching position of the nitrogen-sealed oil scraper ring support 38 and the hydraulic rod 9, so that the sealing of high-pressure gas in the hydraulic cylinder can be realized, dirt and impurities such as dust and sand in the external environment can be prevented from entering the actuating mechanism, and the abrasion of equipment is reduced.
And a combined sealing ring six 32, a combined sealing ring seven 33, a guide belt three 34 and a guide belt four 35 are arranged at the matching position of the nitrogen seal sealing guide support 40 and the hydraulic rod 9 and are used for separating nitrogen in the air cavity D from a process medium in the cylinder of the reciprocating compressor.
The first combined sealing ring 26, the second combined sealing ring 27, the third combined sealing ring 28, the fourth combined sealing ring 29, the fifth combined sealing ring 30, the sixth combined sealing ring 32, the seventh combined sealing ring 33 and the eighth combined sealing ring 37 are all composed of the O-shaped ring 23 and the slip ring 24.
An air charging port 41 is provided on the side wall of the nitrogen sealing device connecting frame 39 for charging nitrogen gas with a certain pressure into the air chamber D.
The unloader is arranged on the compressor air inlet valve 56, and the unloading return spring 57 is arranged in the unloader and can act on the piston rod 8 to enable the piston rod to return.
The hydraulic system comprises an oil inlet pipeline, an oil return pipeline, an oil leakage pipeline, a filter 44, a hydraulic oil station motor 45, a pressure transmitter 46, a liquid level switch 47 and a temperature transmitter 59.
One end of the oil inlet pipeline and one end of the oil return pipeline are respectively communicated with the oil station, and a branch is arranged on the oil return pipeline and used as an oil leakage pipeline. The other end of the oil inlet pipeline is connected with an oil inlet 14 in the mechanical actuating mechanism, the other end of the oil leakage pipeline is connected with an oil drain port 17 in the mechanical actuating mechanism, and the other end of the oil return pipeline is connected with an oil outlet 16 of the mechanical actuating mechanism. The oil inlet pipeline provides high-pressure hydraulic pressure for the mechanical actuating mechanism, and the oil in the mechanical actuating mechanism is returned to the oil station through the return pipeline and the oil leakage pipeline, so that the oil can be recycled.
The number of the filters 44 is two, and the filters are respectively arranged on the oil inlet pipeline and the oil return pipeline. The two filters 44 are redundant filters of one open and one standby, an electromagnetic switch valve is arranged at the front end of each filter 44, when the filter element of the filter 44 is plugged and a plugging signal is transmitted to the control system, the controller system input module 50 can switch the filter 44 through the electromagnetic switch valve while receiving the filter element plugging signal, and close the plugged filter 44 and throw the standby filter 44 into the system, so that the cleanliness of oil in the hydraulic system is ensured, and the plugging fault of a mechanical executing mechanism caused by insufficient cleanliness of the oil is avoided.
The hydraulic oil station motor 45 is arranged at the upper part of the oil station and can drive an internal gear pump of the oil station to provide high-pressure hydraulic oil for a mechanical actuating mechanism.
One end of the pressure transmitter 46 is connected with the oil inlet pipeline, and the other end is communicated with the control system and is used for measuring the oil pressure in the oil inlet pipeline and transmitting an oil pressure signal to the control system.
One end of the liquid level switch 47 is connected with the oil station, and the other end is communicated with the control system, and is used for detecting the liquid level of the oil in the oil station and transmitting a liquid level signal to the control system.
One end of the temperature transmitter 59 is connected with the oil station, and the other end is communicated with the control system, and is used for measuring the oil temperature in the oil station and transmitting an oil temperature signal to the control system.
The control system controls the opening and closing of the electromagnetic valve 1 in the mechanical actuating mechanism, and further controls the opening and closing of the hydraulic cylinder 2, so that the air quantity adjustment of the compressor is realized. Specifically, the input module 50 of the control system first receives the signal from the dead-top sensor 52, and the CPU module 48 calculates the synchronization cycle and the dead-top position of the compressor according to the signal, and then determines the starting time of outputting the signal for controlling the opening of the intake valve 56 of the compressor according to the synchronization cycle and the dead-top position. And then calculates based on the measured compressor load and discharge pressure to determine the duration of the signal to control the opening of the compressor inlet valve 56.
After the output module 49 outputs a signal for controlling the top-opening of the compressor air inlet valve 56, the inside of the electromagnetic valve 1 in the mechanical actuating mechanism is switched to a P-A passage, the hydraulic system acts high-pressure hydraulic oil in the oil station on the mechanical actuating mechanism, the hydraulic cylinder 2 is opened, and the compressor air inlet valve 56 is lifted; when the duration of the jacking of the compressor air inlet valve 56 is controlled, the control system outputs a signal for controlling the resetting of the compressor air inlet valve 56, the inside of the electromagnetic valve 1 in the mechanical actuating mechanism is switched to an A-T passage, hydraulic oil flows back to an oil station through an oil return pipeline, the hydraulic cylinder 2 is closed, and the compressor air inlet valve 56 is closed. For a multi-stage compressor, the present modulation system may modulate inter-stage pressure via final stage feedback.
The control system can also monitor the temperature, the liquid level and the pressure of the oil in the hydraulic system by sending alarm signals, wherein the alarm signals comprise common alarm signals and fault alarm signals. When the common alarm signal appears, the staff can selectively make corresponding measures according to the specific conditions of the site; when a fault alarm signal appears, the control system can send out an interlocking signal to cut off the air quantity regulating system, and workers can throw in the air quantity regulating system again after necessary measures are taken to eliminate the fault.
Claims (10)
1. A stepless air quantity regulating system of a reciprocating compressor is used for the reciprocating compressor, the reciprocating compressor comprises a compressor main motor (51), a compressor flywheel (53), a compressor cylinder (54) and a compressor air inlet valve (56), a piston (55) is arranged in the compressor cylinder (54), and an upper dead point sensor (52) is arranged on one side of the compressor flywheel (53);
the upper dead point sensor (52) is used for collecting the upper dead point position information of the compressor, and the CPU module (48) calculates the synchronous period of the compressor according to the signal, so as to determine the starting time and the jacking duration of a signal for controlling the jacking of the air inlet valve (56) of the compressor;
the method is characterized in that: comprises a control system, a mechanical actuating mechanism and a hydraulic system;
the control system comprises a CPU module (48), an output module (49) and an input module (50), wherein the input module (50) is used for receiving signals, the CPU module (48) is used for sending control instructions, and the output module (49) is used for controlling the mechanical executing mechanism to act;
the power supply of the control system is a redundant power supply (58), and the redundant power supply (58) adopts a three-bus circuit structure of an input bus, a load bus and a shared bus;
the mechanical actuating mechanism is fixed on a valve hole cover of an air inlet valve (56) of the compressor through a bolt and comprises an electromagnetic valve (1), a hydraulic cylinder (2), a nitrogen sealing device (3) and a temperature sensor (4);
the electromagnetic valve (1) is arranged above the hydraulic cylinder (2) and is fixedly connected with the hydraulic cylinder (2) through four fastening screws (19);
a through port A, a through port P and a through port T are arranged on the electromagnetic valve (1); when the port A is communicated with the port P, an oil inlet passage P-A is formed; when the port A is communicated with the port T, an oil return passage A-T is formed;
the hydraulic cylinder (2) comprises an upper cylinder body (5), a lower cylinder body (6), a piston sleeve (7), a piston rod (8), a hydraulic rod (9), a sealing guide support I (10), a sealing guide support II (11), a sealing guide support III (12) and an oil scraper ring support (13);
the upper cylinder body (5) is arranged above the lower cylinder body (6), and the upper cylinder body and the lower cylinder body are fixedly connected through an inner hexagonal cylindrical head screw (18);
a rodless cavity A and a rod-containing cavity B are arranged in the upper cylinder body (5), and the rodless cavity A and the rod-containing cavity B are coaxial;
an O-shaped ring I (21) is arranged at the joint of the upper cylinder body (5) and the lower cylinder body (6) to realize axial static seal and prevent oil in the rod cavity B from leaking;
the upper end surface of the upper cylinder body (5) is provided with a working oil port (15) which is communicated with the through port A and the rodless cavity A;
an oil inlet (14) and an oil outlet (16) are arranged on the side surface of the upper cylinder body (5), wherein the oil inlet (14) is communicated with the through hole P, and the oil outlet (16) is communicated with the through hole T;
an inserting through hole is axially formed in the upper cylinder body (5) and the lower cylinder body (6), and a threaded inserting temperature sensor (4) is arranged in the inserting through hole;
the piston sleeve (7) is arranged in the rodless cavity A and is connected with the upper cylinder body (5) through threads;
a high-pressure sealing ring (20) is arranged at the joint of the piston sleeve (7) and the upper cylinder body (5) to form static seal;
one end of the piston rod (8) is arranged in the piston sleeve (7), a gap exists between the piston rod and the piston sleeve, and the other end of the piston rod (8) is positioned in the rod cavity B;
an annular balance groove is formed in the outer side of the piston rod (8), vortex is formed in the groove when oil flows through the balance groove, so that the oil is converted from a laminar flow state to a turbulent flow mixing state, and a resistance barrier is formed;
an oil drain port (17) and an air drain port (36) are arranged on the side surface of the lower cylinder body (6), and the oil drain port (17) can guide the leakage oil at the sealing position of the piston gap back to the oil tank;
a first sealing guide support (10), a second sealing guide support (11) and a third sealing guide support (12) are sequentially arranged in the lower cylinder body (6) from top to bottom, and three radial static seals are formed between the three sealing guide supports and the inner wall of the lower cylinder body (6) through three second O-shaped rings (22);
the sealing guide support I (10), the sealing guide support II (11) and the sealing guide support III (12) are hollow cylindrical shapes and are coaxial;
an annular sealing cavity C is arranged in the sealing guide support II (11), and the sealing cavity C is communicated with the air leakage port (36);
the inner wall of the sealing guide support I (10) is provided with a groove I and a guide groove I, the combined sealing ring I (26) is arranged in the groove I, and the guide belt I (25) is arranged in the guide groove I;
the inner wall of the sealing guide support II (11) is provided with a groove II and a groove III, the combined sealing ring II (27) is arranged in the groove II, and the combined sealing ring III (28) is arranged in the groove III;
a groove IV and a guide groove II are arranged on the inner wall of the sealing guide support III (12), a combined sealing ring IV (29) is arranged in the groove IV, and a guide belt II (31) is arranged in the guide groove II;
the first guide belt (25) and the second guide belt (31) are used for righting the hydraulic rod (9);
the side wall of the sealing guide support II (11) is provided with a gas leakage hole which is communicated with a gas leakage hole (36) on the side surface of the lower cylinder body (6);
the oil scraper ring support (13) is arranged at the outlet below the lower cylinder body (6) and is connected with the lower cylinder body (6) through threads;
the nitrogen sealing device (3) is arranged below the lower cylinder body (6) and comprises a nitrogen sealing oil scraping ring support (38), a nitrogen sealing device connecting frame (39) and a nitrogen sealing guiding support (40);
the nitrogen seal oil scraper ring support (38), the nitrogen seal device connecting frame (39) and the nitrogen seal guide support (40) are hollow structures and coaxial;
an O-shaped ring IV (43) is further arranged between the nitrogen sealing device connecting frame (39) and the lower cylinder body (6), the nitrogen sealing device connecting frame (39) is fixedly connected with the lower cylinder body (6) through a fastening screw, meanwhile, the O-shaped ring IV (43) is pressed to form an axial static seal, and an air cavity D is arranged in the nitrogen sealing device connecting frame (39);
the nitrogen seal oil scraper ring support (38) is arranged below the nitrogen seal device connecting frame (39), and the nitrogen seal oil scraper ring support and the nitrogen seal oil scraper ring are connected through threads;
the nitrogen seal sealing guide support (40) is arranged in the nitrogen seal device connecting frame (39);
an O-shaped ring III (42) is arranged at the joint of the nitrogen seal guide support (40) and the nitrogen seal device connecting frame (39) to form static seal;
one end of the hydraulic rod (9) is positioned in the rod cavity B, is contacted with one end of the piston rod (8), and passes through the sealing guide support I (10), the sealing cavity C, the sealing guide support II (11), the sealing guide support III (12), the oil scraper ring support (13), the nitrogen sealing device connecting frame (39), the nitrogen sealing guide support (40) and the nitrogen sealing oil scraper ring support (38) to be positioned below the nitrogen sealing device (3);
a combined sealing ring five (30) is arranged at the matching position of the oil scraper ring support (13) and the hydraulic rod (9), and a combined sealing ring eight (37) is arranged at the matching position of the nitrogen seal oil scraper ring support (38) and the hydraulic rod (9);
a combined sealing ring six (32), a combined sealing ring seven (33), a guiding belt three (34) and a guiding belt four (35) are arranged at the matching position of the nitrogen seal guiding support (40) and the hydraulic rod (9), and are used for separating nitrogen in the air cavity D from a process medium in the cylinder of the reciprocating compressor;
an inflation inlet (41) is arranged on the side wall of the nitrogen sealing device connecting frame (39) and is used for inflating nitrogen with certain pressure into the air cavity D;
the unloading device is arranged on the air inlet valve (56) of the compressor, and the unloading reset spring (57) is arranged in the unloading device and can act on the piston rod (8) to reset the piston rod;
the hydraulic system comprises an oil inlet pipeline, an oil return pipeline, an oil leakage pipeline, a filter (44), a hydraulic oil station motor (45), a pressure transmitter (46), a liquid level switch (47) and a temperature transmitter (59);
one end of the oil inlet pipeline and one end of the oil return pipeline are respectively communicated with the oil station, and a branch is arranged on the oil return pipeline and used as an oil leakage pipeline; the other end of the oil inlet pipeline is connected with an oil inlet (14) in the mechanical actuating mechanism, the other end of the oil leakage pipeline is connected with an oil drain port (17) in the mechanical actuating mechanism, and the other end of the oil return pipeline is connected with an oil outlet (16) of the mechanical actuating mechanism;
the two filters (44) are respectively arranged on the oil inlet pipeline and the oil return pipeline;
the hydraulic oil station motor (45) is arranged at the upper part of the oil station and can drive an internal gear pump of the oil station to provide high-pressure hydraulic oil for the mechanical actuating mechanism;
one end of the pressure transmitter (46) is connected with the oil inlet pipeline, and the other end of the pressure transmitter is communicated with the control system and is used for measuring the oil pressure in the oil inlet pipeline and transmitting an oil pressure signal to the control system;
one end of the liquid level switch (47) is connected with the oil station, and the other end of the liquid level switch is communicated with the control system and is used for detecting the liquid level of oil in the oil station and transmitting a liquid level signal to the control system;
one end of the temperature transmitter (59) is connected with the oil station, and the other end of the temperature transmitter is communicated with the control system and is used for measuring the temperature of oil in the oil station and transmitting an oil temperature signal to the control system;
the control system controls the opening and closing of the electromagnetic valve (1) in the mechanical actuating mechanism, and further controls the opening and closing of the hydraulic cylinder (2) to realize the adjustment of the air quantity of the compressor.
2. A stepless regulation system for the gas quantity of a reciprocating compressor as claimed in claim 1, characterized in that: the combined sealing ring I (26), the combined sealing ring II (27), the combined sealing ring III (28), the combined sealing ring IV (29), the combined sealing ring V (30), the combined sealing ring VI (32), the combined sealing ring seven (33) and the combined sealing ring eight (37) are all composed of an O-shaped ring (23) and a slip ring (24).
3. A reciprocating compressor gas flow stepless regulating system as claimed in claim 2, wherein: the power supply 1 and the power supply 2 in the redundant power supply (58) are hot plug power supply modules which are connected in parallel, C1 and C2 are control modules of the power supplies, S1 and S2 are controlled current regulators, SENSE1 and SENSE2 are power supply detection signals, and FB is a load voltage feedback signal;
when the system works normally, the control module enables the system to use each power module in a balanced mode by adjusting the conduction degree of the current regulator, each power module provides the same current for the system, when one power fails, the current regulator is cut off, the failed power is isolated from the power system, and fault alarm is carried out.
4. A reciprocating compressor gas flow stepless regulating system as claimed in claim 3, wherein: the two filters (44) are redundant filters which are all 'one-on-one-standby', and an electromagnetic switch valve is arranged at the front end of each filter (44).
5. A reciprocating compressor gas flow stepless regulating system as claimed in claim 4, wherein: the hydraulic system supplies high-pressure hydraulic pressure to the mechanical actuating mechanism through the oil inlet pipeline, and returns oil in the mechanical actuating mechanism to the oil station through the return pipeline and the oil leakage pipeline, so that the oil can be recycled.
6. A reciprocating compressor gas flow stepless regulating system as set forth in claim 5, wherein: the piston rod (8) and the piston sleeve (7) are made of chromium-molybdenum steel, and the hardness of the piston rod and the piston sleeve is poor; the slip ring (24) is made of polytetrafluoroethylene containing carbon fibers.
7. A reciprocating compressor gas flow stepless regulating system as set forth in claim 6, wherein: after an input module (50) of the control system receives a signal of an upper dead point sensor (52), a CPU module (48) calculates a synchronous period and a top dead point position of the compressor according to the signal, determines a starting time of outputting a signal for controlling the top opening of an air inlet valve (56) of the compressor according to the synchronous period and the top dead point position, calculates according to a measured value of the load and the exhaust pressure of the compressor, and determines duration of the signal for controlling the top opening of the air inlet valve (56) of the compressor;
after the output module (49) outputs a signal for controlling the jacking-up of the air inlet valve (56) of the compressor, the inside of the electromagnetic valve (1) in the mechanical actuating mechanism is switched to a P-A passage, the hydraulic system acts high-pressure hydraulic oil in the oil station on the mechanical actuating mechanism, the hydraulic cylinder (2) is opened, and the air inlet valve (56) of the compressor is jacked up; when the duration of the jacking of the air inlet valve (56) of the compressor is controlled, the control system outputs a signal for controlling the resetting of the air inlet valve (56) of the compressor, the inside of the electromagnetic valve (1) in the mechanical actuating mechanism is switched to an A-T passage, hydraulic oil flows back to an oil station through an oil return pipeline, the hydraulic cylinder (2) is closed, and the air inlet valve (56) of the compressor is closed.
8. A reciprocating compressor gas flow stepless regulating system as set forth in claim 7, wherein: the control system can also monitor the temperature, the liquid level and the pressure of oil in the hydraulic system by sending alarm signals, detect faults when the motor (45) of the hydraulic oil station is started and overloaded, and set an alarm for filters (44) on an oil inlet pipeline and an oil return pipeline of the hydraulic system;
the alarm signals comprise a common alarm signal and a fault alarm signal;
when the common alarm signal appears, the staff can selectively make corresponding measures according to the specific conditions of the site; when a fault alarm signal appears, the control system can send out an interlocking signal to cut off the air quantity regulating system, and workers can throw in the air quantity regulating system again after necessary measures are taken to eliminate the fault.
9. A reciprocating compressor gas flow stepless regulating system as set forth in claim 8, wherein: when the temperature value measured by the temperature sensor (4) exceeds the normal range, the operation of the compressor air inlet valve (56) is abnormal, and the control system can send out a fault alarm signal of the excessive temperature of the compressor air inlet valve and stop the hydraulic oil station motor (45) in an interlocking way;
the air quantity regulating system utilizes a top dead center position signal received by a top dead point sensor (52) to transmit to a control system, and the control system calculates a control period in real time according to the signal; when the cycle value calculated by the control system is smaller than T/2 or larger than 3T/2 in 5 compressor working cycles continuously, T is the rated working cycle of the compressor, the regulating system can be automatically cut off, and the air quantity of the reciprocating compressor is regulated by the original regulating mode.
10. A reciprocating compressor gas flow stepless regulating system as claimed in claim 9, wherein: when the control system fails, the control signal is not output any more, the solenoid valve (1) in the mechanical actuating mechanism can not receive the control signal, the valve core of the solenoid valve (1) is automatically reset to a safe position under the action of the spring in the valve, the oil inlet passage of the solenoid valve (1) is closed in the safe position, the through opening A of the solenoid valve (1) is connected with the through opening T, the hydraulic cylinder (2) is connected with the through opening A of the solenoid valve (1) and immediately depressurized, the piston rod (8) of the hydraulic cylinder (2) can be reset under the action of the unloading reset spring (57), after the piston rod (8) is reset, the opening and closing of the air inlet valve (56) of the compressor is not controlled by the action of the hydraulic cylinder (2) any more, the reciprocating compressor is only controlled by the pressure difference between the inlet and outlet of the air inlet valve (56) of the compressor, the reciprocating compressor can not adjust the air quantity and save energy, but the safe and reliable normal operation of the reciprocating compressor can not be influenced.
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| JPH1182314A (en) * | 1997-09-01 | 1999-03-26 | Japan Steel Works Ltd:The | Displacement adjusting device of displacement reciprocating compressor |
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| JP4221893B2 (en) * | 2000-02-28 | 2009-02-12 | 株式会社豊田自動織機 | Capacity control device and compressor module for variable capacity compressor |
| CN101270741A (en) * | 2008-05-07 | 2008-09-24 | 浙江大学 | Reciprocating compressor stepless gas amount regulating system used for explosive gas area |
| CN107228068B (en) * | 2017-05-08 | 2018-11-16 | 北京化工大学 | A kind of reciprocating compressor exhaust amount adjustment method and device |
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH1182314A (en) * | 1997-09-01 | 1999-03-26 | Japan Steel Works Ltd:The | Displacement adjusting device of displacement reciprocating compressor |
| CN205013264U (en) * | 2015-10-05 | 2016-02-03 | 天华化工机械及自动化研究设计院有限公司 | Compressor tolerance infinitely variable control system |
| CN205478235U (en) * | 2016-01-27 | 2016-08-17 | 北京博华信智科技股份有限公司 | Reciprocating compressor tolerance governing system |
| CN207609544U (en) * | 2017-11-22 | 2018-07-13 | 北京航天石化技术装备工程有限公司 | A kind of reciprocating compressor tolerance stepless regulating system |
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