CN115405526A - Multistage frequency conversion screw air compressor - Google Patents
Multistage frequency conversion screw air compressor Download PDFInfo
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- CN115405526A CN115405526A CN202211253106.3A CN202211253106A CN115405526A CN 115405526 A CN115405526 A CN 115405526A CN 202211253106 A CN202211253106 A CN 202211253106A CN 115405526 A CN115405526 A CN 115405526A
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- 238000006243 chemical reaction Methods 0.000 title claims abstract description 10
- 230000006835 compression Effects 0.000 claims abstract description 122
- 238000007906 compression Methods 0.000 claims abstract description 122
- 230000005611 electricity Effects 0.000 claims abstract description 4
- 239000007788 liquid Substances 0.000 claims description 124
- 230000001050 lubricating effect Effects 0.000 claims description 10
- 239000012530 fluid Substances 0.000 claims description 8
- 238000001802 infusion Methods 0.000 claims description 8
- 238000012544 monitoring process Methods 0.000 claims description 7
- 230000001105 regulatory effect Effects 0.000 claims description 7
- 230000001276 controlling effect Effects 0.000 claims description 4
- 238000013016 damping Methods 0.000 claims description 4
- 239000002699 waste material Substances 0.000 abstract description 4
- 230000001502 supplementing effect Effects 0.000 description 11
- 239000002826 coolant Substances 0.000 description 5
- 238000000034 method Methods 0.000 description 4
- 238000010586 diagram Methods 0.000 description 3
- 238000012360 testing method Methods 0.000 description 3
- 230000008901 benefit Effects 0.000 description 2
- 230000000694 effects Effects 0.000 description 2
- 230000002349 favourable effect Effects 0.000 description 2
- 238000001914 filtration Methods 0.000 description 2
- 239000012535 impurity Substances 0.000 description 2
- 239000013589 supplement Substances 0.000 description 2
- 230000001133 acceleration Effects 0.000 description 1
- 230000004308 accommodation Effects 0.000 description 1
- 238000007792 addition Methods 0.000 description 1
- 230000005540 biological transmission Effects 0.000 description 1
- 238000004891 communication Methods 0.000 description 1
- 238000001816 cooling Methods 0.000 description 1
- 239000000110 cooling liquid Substances 0.000 description 1
- 238000007791 dehumidification Methods 0.000 description 1
- 238000006073 displacement reaction Methods 0.000 description 1
- 238000001704 evaporation Methods 0.000 description 1
- 230000008020 evaporation Effects 0.000 description 1
- 238000012423 maintenance Methods 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 239000000047 product Substances 0.000 description 1
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 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
- F04C—ROTARY-PISTON, OR OSCILLATING-PISTON, POSITIVE-DISPLACEMENT MACHINES FOR LIQUIDS; ROTARY-PISTON, OR OSCILLATING-PISTON, POSITIVE-DISPLACEMENT PUMPS
- F04C23/00—Combinations of two or more pumps, each being of rotary-piston or oscillating-piston type, specially adapted for elastic fluids; Pumping installations specially adapted for elastic fluids; Multi-stage pumps specially adapted for elastic fluids
- F04C23/001—Combinations of two or more pumps, each being of rotary-piston or oscillating-piston type, specially adapted for elastic fluids; Pumping installations specially adapted for elastic fluids; Multi-stage pumps specially adapted for elastic fluids of similar working principle
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
- F04C—ROTARY-PISTON, OR OSCILLATING-PISTON, POSITIVE-DISPLACEMENT MACHINES FOR LIQUIDS; ROTARY-PISTON, OR OSCILLATING-PISTON, POSITIVE-DISPLACEMENT PUMPS
- F04C23/00—Combinations of two or more pumps, each being of rotary-piston or oscillating-piston type, specially adapted for elastic fluids; Pumping installations specially adapted for elastic fluids; Multi-stage pumps specially adapted for elastic fluids
- F04C23/02—Pumps characterised by combination with, or adaptation to, specific driving engines or motors
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
- F04C—ROTARY-PISTON, OR OSCILLATING-PISTON, POSITIVE-DISPLACEMENT MACHINES FOR LIQUIDS; ROTARY-PISTON, OR OSCILLATING-PISTON, POSITIVE-DISPLACEMENT PUMPS
- F04C28/00—Control of, monitoring of, or safety arrangements for, pumps or pumping installations specially adapted for elastic fluids
- F04C28/08—Control of, monitoring of, or safety arrangements for, pumps or pumping installations specially adapted for elastic fluids characterised by varying the rotational speed
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
- F04C—ROTARY-PISTON, OR OSCILLATING-PISTON, POSITIVE-DISPLACEMENT MACHINES FOR LIQUIDS; ROTARY-PISTON, OR OSCILLATING-PISTON, POSITIVE-DISPLACEMENT PUMPS
- F04C28/00—Control of, monitoring of, or safety arrangements for, pumps or pumping installations specially adapted for elastic fluids
- F04C28/28—Safety arrangements; Monitoring
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
- F04C—ROTARY-PISTON, OR OSCILLATING-PISTON, POSITIVE-DISPLACEMENT MACHINES FOR LIQUIDS; ROTARY-PISTON, OR OSCILLATING-PISTON, POSITIVE-DISPLACEMENT PUMPS
- F04C29/00—Component parts, details or accessories of pumps or pumping installations, not provided for in groups F04C18/00 - F04C28/00
- F04C29/0092—Removing solid or liquid contaminants from the gas under pumping, e.g. by filtering or deposition; Purging; Scrubbing; Cleaning
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
- F04C—ROTARY-PISTON, OR OSCILLATING-PISTON, POSITIVE-DISPLACEMENT MACHINES FOR LIQUIDS; ROTARY-PISTON, OR OSCILLATING-PISTON, POSITIVE-DISPLACEMENT PUMPS
- F04C29/00—Component parts, details or accessories of pumps or pumping installations, not provided for in groups F04C18/00 - F04C28/00
- F04C29/02—Lubrication; Lubricant separation
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- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- General Engineering & Computer Science (AREA)
- Applications Or Details Of Rotary Compressors (AREA)
Abstract
The invention provides a multi-stage variable frequency screw air compressor, and belongs to the technical field of air compressors. It has solved the not enough technical problem of current helical-lobe compressor energy efficiency. This multistage frequency conversion screw air compressor includes the one-level compression host computer and the second grade compression host computer that the gas circuit is established ties, and the compressor still includes inverter motor one, inverter motor two and can adjust the controller of one inverter motor adaptability rotational speed and two adaptability rotational speeds of inverter motor respectively along with using flow variation, the controller is connected with inverter motor one and two electricity of inverter motor, the output shaft of inverter motor one with the power input end of one-level compression host computer is connected, the output shaft of inverter motor two with the power input end of second grade compression host computer is connected. The invention can reduce energy waste and leakage loss, thereby improving the energy efficiency of the compressor.
Description
Technical Field
The invention belongs to the technical field of compressors, and relates to a multi-stage variable frequency screw air compressor.
Background
The screw compressor is a meshing pair consisting of a cylindrical screw and two plane star wheels which are symmetrically arranged and is arranged in a machine shell. The screw groove, the inner wall of the shell and the star wheel tooth form a closed volume. The power is transmitted to the screw shaft, and the screw drives the star wheel to rotate. The gas enters the spiral groove from the gas suction cavity, and is discharged through the gas discharge hole and the gas discharge cavity after being compressed. The star wheel acts as a piston of a reciprocating piston compressor, and when the star wheel teeth move relatively in the screw grooves, the closed volume is gradually reduced, and the gas is compressed.
The Chinese patent with application publication number CN102705238A is a shaft seal-free tandem type multistage screw compressor developed by the applicant before, two compression main machines with gas circuits arranged in series are driven by a motor to rotate synchronously, multistage pressurization is effectively realized, the structure is compact, and the maintenance is convenient. In order to improve the working adaptability of the compressor, the rotating speed of the motor can be adjusted to realize the adjustment of the working flow.
However, the stable regulation range of the two-stage compression main engine is often smaller in the motor regulation process, and the working energy efficiency in the regulation extremum region is also influenced. To guarantee a high working efficiency while adjusting, the person skilled in the art easily considers: 1. a plurality of groups of compressors which can be started and stopped are arranged, and the regulation effect is realized by independently starting and stopping the compressors, so that the regulation range is large and the loss is low; 2. and a bypass is arranged for adjusting, so that part of discharged air flows back to the air inlet through a pipeline, the output flow is adjusted, and the energy loss is reduced.
Disclosure of Invention
The invention provides a variable-frequency medium-pressure screw air compressor aiming at the problems in the prior art, and the technical problems to be solved by the invention are as follows: how to improve the energy efficiency of the adjustable air compressor.
The purpose of the invention can be realized by the following technical scheme:
the utility model provides a multistage frequency conversion screw air compressor, includes the one-level compression host computer and the second grade compression host computer of gas circuit series connection, its characterized in that, the compressor still includes inverter motor one, inverter motor two and can adjust the controller of an inverter motor adaptability rotational speed and two adaptability rotational speeds of inverter motor along with using flow variation respectively, the controller is connected with inverter motor one and two electricity of inverter motor, the output shaft of inverter motor one with the power input end of one-level compression host computer is connected, the output shaft of inverter motor two with the power input end of second grade compression host computer is connected.
The primary compression main machine is used for primarily compressing sucked air to reach specified pressure, and the primarily compressed air enters the secondary compression main machine for further compression to reach higher specified pressure to meet the industrial use requirement; the first-stage compression host and the second-stage compression host are respectively controlled to rotate by arranging the first variable frequency motor and the second variable frequency motor, when the compressor is used for constant pressure and flow changes, the controller can receive flow monitoring signals of compressed air using equipment or flow monitoring associated data signals of the compressor and respectively adjust the rotating speed of the first variable frequency motor and the second variable frequency motor, the first-stage compression host and the second-stage compression host are not limited to practical flow adjustment with the rotating speed changes any more, adjustment of a larger using flow range can be realized, different constant pressure using flow demands can be met, the controller can use flow values according to the constant pressure of the actual demands of users, the first variable frequency motor and the second variable frequency motor can be respectively adjusted according to the instruction of the controller, the most economic and stable working state can be realized after adjustment of the compressor is completed, and energy waste and leakage loss caused by pressure mismatching between the first-stage compression host and the second-stage compression host are reduced, and the energy efficiency of the compressor is improved.
In foretell multistage frequency conversion screw air compressor, the compressor still includes the baroceptor that can monitor one-level compression host computer output pressure and second grade compression host computer output pressure, the controller with the baroceptor electricity is connected, and this controller can adjust inverter motor one and inverter motor two's rotational speed when the pressure that the baroceptor monitored is less than preset pressure and rise, and this controller can adjust inverter motor one and inverter motor two's rotational speed and reduce when the pressure that the baroceptor monitored is higher than preset pressure. Like this when the user uses the flow increase, the output pressure of second grade compression host computer can reduce at first, and pressure numerical value can direct reaction user's flow user state like this, and the steerable inverter motor of controller is two with inverter motor improves the rotational speed respectively this moment, and the rotational speed remains stable when pressure numerical value all reachs preset numerical value, and then realizes the adaptability adjustment, avoids the loss in order to improve energy efficiency.
As another scheme, the controller stores constant-pressure use flow-rotation speed curve data which are respectively formed by testing different use flows under the conditions of constant-pressure air inlet and constant-pressure air outlet of the two-stage compression main machine and respectively correspond to the stable rotation speed of the first variable-frequency motor and the stable rotation speed of the second variable-frequency motor, and the controller can respectively adjust the rotation speed of the first variable-frequency motor and the rotation speed of the second variable-frequency motor when the use flow changes according to the constant-pressure use flow-rotation speed curve data. Specifically, a tester firstly determines rated working pressure values of an air inlet end and an air outlet end of a secondary compression main machine respectively, then uses the determined constant pressure (corresponding to the pressure of the air outlet end of the secondary compression main machine) to use the flow to require a compressor to work and simultaneously respectively adjusts the air pressure values of the air inlet end and the air outlet end of the secondary compression main machine to be respectively stabilized to preset values by using the determined constant pressure, records the corresponding rotating speed values of the first variable frequency motor and the second variable frequency motor, finally changes the magnitude of the constant pressure using flow step by step to detect and record the corresponding rotating speed values of the first variable frequency motor and the second variable frequency motor in a stable state, and finally forms a constant pressure using flow-rotating speed curve in a certain constant pressure using flow range; namely, for a constant-pressure use flow value required by a user, the first variable frequency motor and the second variable frequency motor can be respectively regulated according to the rotating speeds corresponding to the use flow value in curve data preset in the controller, so that the most economical and stable working state can be realized after the adjustment of the compressor is completed, and the energy efficiency of the compressor is improved.
In foretell multistage frequency conversion screw air compressor, the compressor still includes one-level vapour and liquid separator, one-level vapour and liquid separator's air inlet with the gas outlet intercommunication of one-level compression host computer, this one-level vapour and liquid separator's gas outlet with the air inlet intercommunication of second grade compression host computer, this controller can use two first accelerations of control inverter motor when the flow improves and use the first deceleration of control inverter motor when the flow reduces at the constant voltage. The first-stage gas-liquid separator is positioned between the first-stage compression main machine and the second-stage compression main machine, when the displacement of the compressor needs to be increased, the controller controls the variable frequency motor II to accelerate first, so that the pressure at the air inlet of the second-stage compression main machine and the pressure of the first-stage gas-liquid separator are reduced after the screw rod is accelerated and extracted, the first-stage compression main machine can accelerate more smoothly, and meanwhile, the situation that the pressure of a closed space between the air outlet of the first-stage compression main machine and the air inlet of the second-stage compression main machine, such as the first-stage gas-liquid separator and the like, is too high due to different rotating speed change speeds during adjustment is avoided, and leakage loss is avoided; when the corresponding compressor needs to reduce the discharge capacity, the controller controls the variable frequency motor to decelerate first, at the moment, the pressure of the closed space between the air outlet of the first-stage compression main machine and the air inlet of the second-stage compression main machine is reduced, the pressure of the closed space is gradually recovered after the second-stage compression main machine is subsequently decelerated, the leakage loss caused by sudden pressure increase in the closed space can be avoided, and the energy efficiency of the compressor is improved.
As another scheme, the compressor further comprises a secondary gas-liquid separator, the gas outlet of the main compression unit is directly communicated with the gas inlet of the secondary main compression unit, and the gas outlet of the main compression unit is communicated with the gas inlet of the secondary gas-liquid separator. Compared with the traditional two-stage compressor, the gas-liquid separator is omitted, and the cost is lower.
In the multi-stage variable frequency screw air compressor, the first variable frequency motor and the second variable frequency motor are arranged at intervals along the horizontal direction or the vertical direction. The variable frequency motor I and the variable frequency motor II are arranged at a certain distance, so that the first-stage compression main machine, the second-stage compression main machine, the first-stage gas-liquid separator and the second-stage gas-liquid separator are conveniently communicated, meanwhile, the vibration interference between the variable frequency motor I and the variable frequency motor II can be reduced, and the resonance influence possibly caused when the variable frequency motor I and the variable frequency motor II rotate at the same speed is weakened.
In the frequency screw air compressor, the compressor further comprises a second-stage gas-liquid separator, a first-stage filter and a second-stage filter, wherein the inlet of the first-stage filter and the inlet of the second-stage filter are respectively communicated with the liquid discharge port of the first-stage gas-liquid separator and the liquid discharge port of the second-stage gas-liquid separator, the first-stage filter is communicated with the inner cavity of the second-stage compression host through a first openable liquid supplementing pipe, and a first pressure pump capable of driving lubricating liquid to be conveyed towards the second-stage compression host is arranged in the middle section of the first liquid supplementing pipe. Second grade vapour and liquid separator can carry out dehumidification to the exhaust compressed air of second grade compression host computer, and primary filter and secondary filter are used for filtering the coolant liquid of separating, can not cause the damage to screw rod and star gear because of impurity after guaranteeing its circulation to get into the compressor, and coolant liquid in the primary filter can get into the inner chamber of second grade compression host computer after the fluid infusion pipe that opens like this is once the force (forcing) pump drive, avoids the phenomenon that the lubricated liquid is not enough to appear because of the pressure variation behind the speed governing in the second grade compression host computer.
In foretell frequency screw air compressor, the compressor still include one end with the air inlet intercommunication of one-level compression host computer and open closed fluid infusion pipe two, the other end and the external world intercommunication of fluid infusion pipe two, the middle section of this fluid infusion pipe two is equipped with can drive the force (forcing) pump two that lubricated liquid carried towards one-level compression host computer. When the phenomenon that the lubricating liquid is insufficient due to evaporation or replacement of the water liquid in the primary compression main machine, an operator can supplement the lubricating liquid through the opened liquid supplementing pipe II and the pressurizing pump through the primary compression main machine, and the stable adjusting state of the compressor is ensured.
In the frequency screw air compressor, the first-stage gas-liquid separator and the second-stage gas-liquid separator are respectively connected with an openable liquid through pipe, the inner cavity of the first-stage gas-liquid separator and the inner cavity of the second-stage gas-liquid separator are respectively communicated with one end of the liquid through pipe, and the other ends of the liquid through pipes are communicated with the outside. Like this through the inside area of the discharge tube steerable one-level vapour and liquid separator and second grade vapour and liquid separator pressure coolant liquid capacity, do benefit to the demand that satisfies different pressure regulating operating condition, guarantee compressor regulation state stable.
In the frequency screw air compressor, the main compressor further comprises an air inlet pipe communicated with the air inlet of the primary main compressor and an exhaust pipe communicated with the air outlet of the secondary gas-liquid separator, and an air inlet valve capable of controlling the flow cross section is arranged at the air inlet of the primary main compressor. Therefore, an operator can perform auxiliary control on the air inlet section through the air inlet valve, and the air inlet section is favorable for being matched with the compressor in rotating speed regulation so as to improve the working energy efficiency of the compressor.
In the above-mentioned frequency screw air compressor, there are two air pressure sensors, one of which is disposed on the first-stage gas-liquid separator, and the other of which is disposed on the exhaust pipe. The pressure in the primary gas-liquid separator and the pressure in the exhaust pipe respectively correspond to the working pressure actually received by the primary gas-liquid separator and the user, so that the controller can be ensured to regulate and control the rotating speed according to accurate pressure data, and operators can observe the change of the working pressure conveniently to judge the regulation state; and for the scheme of presetting control curve data, continuous feedback can be formed for the controller so as to realize the control of the rotating speed, namely if the regulated rotating speed has deviation in the process of using flow regulation, the adaptability of the controllable rotating speed is improved or reduced when the air pressure is higher or lower than the specified pressure, and auxiliary calibration is realized, so that the regulation is more accurate and stable.
In the above-mentioned frequency screw air compressor, a minimum pressure valve is provided between the air outlet of the primary gas-liquid separator and the air inlet of the secondary compression main machine. Like this high-pressure air in the second grade compression host computer can not return to in the one-level vapour and liquid separator when the compressor is adjusted and is used flow, further guarantee in the accommodation process that excessive pressure state can not appear in the one-level vapour and liquid separator, and then avoid the loss of leaking, improve the work efficiency.
In the multistage variable frequency screw air compressor, the bottom of the first-stage compression main machine, the bottom of the second-stage compression main machine, the bottom of the first variable frequency motor and the bottom of the second variable frequency motor are respectively provided with a damping pad. Therefore, the influence of working vibration of the first-stage compression host, the second-stage compression host, the first variable frequency motor and the second variable frequency motor can be relieved, noise is reduced, and the working stability of the compressor is ensured.
Compared with the prior art, the invention has the following advantages:
this multistage frequency conversion screw air compressor operates two compression host computer the same or different rotational speeds respectively through control inverter motor one and inverter motor two, when the compressor uses flow control like this, one-level compression host computer and second grade compression host computer no longer confine to the flow control with the rotational speed change, the control range is bigger, and reply different use flow demand steerable inverter motor one and the second different work speed of predetermineeing of inverter motor realize the most economic stable operating condition, and then reduce the energy waste and because of the outside leakage loss that the pressure mismatch leads to between the back one-level compression host computer and second grade compression host computer, thereby improve the efficiency of compressor.
Drawings
Fig. 1 is a schematic perspective view of the first embodiment.
Fig. 2 is a schematic perspective view of another angle in the present embodiment.
FIG. 3 is a logic diagram illustrating the controller adjusting the rotational speed according to one embodiment.
FIG. 4 is a schematic diagram of a flow rate-rotation speed curve for constant pressure application in the second embodiment.
In the figure, 1, a primary compression host; 2. a secondary compression host; 3. a variable frequency motor I; 4. a variable frequency motor II; 5. a controller; 6. a first-stage gas-liquid separator; 7. a secondary gas-liquid separator; 8. a first stage filter; 9. a secondary filter; 10. a first liquid supplementing pipe; 11. a first pressure pump; 12. a second liquid supplementing pipe; 13. a second pressure pump; 14. a liquid pipe is communicated; 15. an air pressure sensor; 16. an air inlet pipe; 17. an exhaust pipe; 18. an intake valve; 19. a minimum pressure valve; 20. a vibration damping pad.
Detailed Description
The following are specific embodiments of the present invention and are further described with reference to the drawings, but the present invention is not limited to these embodiments.
The first embodiment is as follows:
as shown in fig. 1-3, the multistage variable frequency screw air compressor comprises a first-stage compression main machine 1 and a second-stage compression main machine 2 which are connected in series through an air passage, and further comprises a first variable frequency motor 3 and a second variable frequency motor 4 which are respectively in transmission connection with the first-stage compression main machine 1 and the second-stage compression main machine 2, wherein an output shaft of the first variable frequency motor 3 is coaxially connected with a power input end of the first-stage compression main machine 1, and an output shaft of the second variable frequency motor 4 is coaxially connected with a power input end of the second-stage compression main machine 2. The lubricating liquid is water-lubricated, so that the lubricating liquid is cleaner and better in cooling effect, the mechanical seal is added to the secondary compression main machine 2 to ensure high-pressure tightness, the primary compression main machine 1 preliminarily compresses sucked air, and the preliminarily compressed air enters the secondary compression main machine 2 to be further compressed so as to reach specified pressure to meet the industrial use requirement; the first-stage compression host 1 and the second-stage compression host 2 are controlled to rotate respectively by the first variable frequency motor 3 and the second variable frequency motor 4, when the compressor is used for adjusting the flow, the first-stage compression host 1 and the second-stage compression host 2 are not limited to flow adjustment with the change of the rotating speed any more, the adjusting range of the using flow of the compressor is larger, the rotating speed of the first variable frequency motor 3 and the rotating speed of the second variable frequency motor 4 can be controlled by the controller 5, the compressor further comprises an air pressure sensor 15 capable of monitoring the output pressure of the first-stage compression host 1 and the output pressure of the second-stage compression host 2, the controller 5 is electrically connected with the air pressure sensor 15, when the pressure monitored by the air pressure sensor 15 is lower than the preset pressure, the controller 5 can adjust the rotating speed increase of the first variable frequency motor 3 and the rotating speed decrease of the second variable frequency motor 4, and when the pressure monitored by the air pressure sensor 15 is higher than the preset pressure. The controller 5 may be a commercially available inchwite controller.
The air inlet of the first-stage gas-liquid separator 6 is communicated with the air outlet of the first-stage compression main machine 1, and the air outlet of the first-stage gas-liquid separator 6 is communicated with the air inlet of the second-stage compression main machine 2. The first-stage gas-liquid separator 6 is positioned between the first-stage compression main machine 1 and the second-stage compression main machine 2, and a minimum pressure valve 19 is arranged between an air outlet of the first-stage gas-liquid separator 6 and an air inlet of the second-stage compression main machine 2. Like this high-pressure air in the second grade compression host computer 2 can not be adverse-rising to in the one-level vapour and liquid separator 6 when the compressor is adjusted and is used flow, can not appear too high pressure state in the further assurance adjusting process one-level vapour and liquid separator 6, and then avoids the loss of leaking, improves work energy efficiency. As shown in fig. 1 and 2, the first variable frequency motor 3 and the second variable frequency motor 4 are arranged at intervals along the horizontal direction, the compressor further comprises a second-stage gas-liquid separator 7, and the first-stage gas-liquid separator 6 and the second-stage gas-liquid separator 7 are uniformly arranged between the first variable frequency motor 3 and the second variable frequency motor 4. And like this the interval between inverter motor 3 and inverter motor two 4 arranges the intercommunication at one-level vapour and liquid separator 6 and second grade vapour and liquid separator 7 both sides, be convenient for one-level compressor 1 and second grade compressor 2 and one-level vapour and liquid separator 6 and second grade vapour and liquid separator 7 arrangement, can reduce the vibration interference between inverter motor 3 and inverter motor two 4 simultaneously, weaken both resonance influence that probably cause when with the rotational speed. The compressor further comprises a primary filter 8 and a secondary filter 9, the inlet of the primary filter 8 and the inlet of the secondary filter 9 are communicated with the liquid discharge port of the primary gas-liquid separator 6 and the liquid discharge port of the secondary gas-liquid separator 7 respectively, the primary filter 8 is communicated with the inner cavity of the secondary compression main machine 2 through a first openable liquid supplementing pipe 10, and a first pressurizing pump 11 capable of driving lubricating liquid to be conveyed towards the secondary compression main machine 2 is arranged in the middle section of the first liquid supplementing pipe 10. First-order filter 8 and secondary filter 9 are used for filtering the coolant liquid of separating, guarantee that its circulation can not cause the damage to screw rod and star gear because of impurity after getting into the compressor, and coolant liquid in the first-order filter 8 can be from getting into the inner chamber of secondary compression host computer 2 after the fluid infusion pipe 10 that opens drives through force (forcing) pump 11 like this, and the phenomenon that lubricated liquid is not enough appears because of the pressure variation behind the speed governing in the secondary compression host computer 2 is avoided. The compressor also comprises a second liquid supplementing pipe 12 with one end communicated with the air inlet of the first-stage compression main machine 1 and capable of being opened and closed, the other end of the second liquid supplementing pipe 12 is communicated with the outside, and a second pressure pump 13 capable of driving lubricating liquid to be conveyed towards the first-stage compression main machine 1 is arranged in the middle section of the second liquid supplementing pipe 12. Therefore, when the phenomenon that the lubricating liquid is insufficient due to pressure change after speed regulation in the primary compression main engine 1 occurs, an operator can supplement the lubricating liquid to the primary compression main engine 1 through the opened liquid supplementing pipe II 12 and the pressurizing pump II 13 from the outside, and the stable regulation state of the compressor is ensured. The first-stage gas-liquid separator 6 and the second-stage gas-liquid separator 7 are respectively connected with an openable liquid through pipe 14, the inner cavity of the first-stage gas-liquid separator 6 and the inner cavity of the second-stage gas-liquid separator 7 are respectively communicated with one ends of the two liquid through pipes 14, and the other ends of the two liquid through pipes 14 are communicated with the outside. Therefore, the pressure cooling liquid capacity in the first-stage gas-liquid separator 6 and the second-stage gas-liquid separator 7 can be controlled through the liquid passing pipe 14, the requirements of different pressure regulating working states can be met, and the stable regulating state of the compressor is ensured. The main compressor also comprises an air inlet pipe 16 communicated with the air inlet of the primary main compressor 1 and an air outlet pipe 17 communicated with the air outlet of the secondary gas-liquid separator 7, and an air inlet valve 18 capable of controlling the flow cross section is arranged at the air inlet of the primary main compressor 1 communicated with the air inlet pipe 16. Therefore, an operator can perform auxiliary control on the air inlet section through the air inlet valve 18, and the auxiliary control is favorable for being matched with the rotation speed regulation of the compressor so as to improve the working energy efficiency of the compressor. Preferably, the bottom of the primary compressor 1, the bottom of the secondary compressor 2, the bottom of the variable frequency motor I3 and the bottom of the variable frequency motor II 4 are provided with damping pads 20. Therefore, the influence of working vibration of the primary compression main machine 1, the secondary compression main machine 2, the first variable frequency motor 3 and the second variable frequency motor 4 can be relieved, noise is reduced, and the working stability of the compressor is ensured. Further, the two air pressure sensors 15 are respectively arranged on the first-stage gas-liquid separator 6 and the exhaust pipe 17, and the exhaust pipe 17 is directly connected with user equipment, so that the actual output pressure can be judged more accurately, and the adjustment accuracy is ensured.
The second embodiment:
as shown in fig. 4, the present embodiment is substantially the same as the first embodiment, except that: the controller 5 can adjust the final rotating speed according to the constant-pressure use flow-rotating speed curve according to the use flow requirement, so that the variable frequency motor I3 and the variable frequency motor II 4 respectively reach the optimal working rotating speed to realize the most economical and stable working state; the flow-rotation speed curve is a smooth curve drawn by testing personnel to record data after the first variable frequency motor 3 and the second variable frequency motor 4 respectively reach the optimal rotation speed under various constant-pressure using flow conditions, for example, the test steps formed by the constant-pressure using flow-rotation speed curve are as follows: a. starting a compressor, respectively determining the output pressure of a primary compression main machine 1 to be 0.7Mpa and the output pressure of a secondary compression main machine 2 to be 4Mpa, and determining the use flow to be 200L/min; b. respectively adjusting the rotating speeds of the first variable frequency motor 3 and the second variable frequency motor 4, monitoring and controlling the pressures of the two-stage compression host machines to be respectively stabilized at 0.7Mpa and 4Mpa under the condition of reaching the use flow, and recording the corresponding rotating speeds of the first variable frequency motor 3 and the second variable frequency motor 4 at the moment; c. increasing the use flow setting by 50L/min each time and repeating the steps; d. and forming a smooth curve according to the recorded data corresponding to the constant pressure using flow numerical value and the rotating speed. Fig. 4 is a schematic diagram of a constant pressure (4 Mpa) using a flow-rotation speed curve, in which a curve a corresponds to the first 3 operating rotation speed of the first stage inverter motor and a curve B corresponds to the second 4 operating rotation speed of the second stage inverter motor.
The controller 5 can directly correspond to obtain respective final rotating speed values of the first variable frequency motor 3 and the second variable frequency motor 4 according to the determined working flow numerical value coordinates according to the constant-pressure using flow-rotating speed curve, and the final rotating speeds of the first variable frequency motor 3 and the second variable frequency motor 4 can be directly adjusted through the controller 5 after the using flow changes, so that energy waste and leakage loss caused by pressure mismatch between the adjusted first-stage compression main machine 1 and the adjusted second-stage compression main machine 2 are reduced, and the energy efficiency of the compressor is improved. Further, the compressor further comprises a first-stage gas-liquid separator 6 and a flow sensor for monitoring the exhaust flow of the compressor, the flow sensor is a commercially available product and can be installed at an exhaust port of the compressor or on user equipment, the flow sensor is in communication connection with the controller 5, the controller 5 stores constant-pressure use flow-rotation speed curve data and controls the frequency converter, and preferably, the first-stage gas-liquid separator 6 and the exhaust pipe 17 are both provided with air pressure sensors 15 for monitoring internal air pressure. The pressure inside the first-stage gas-liquid separator 6 and the pressure inside the second-stage gas-liquid separator 7 correspond to the first-stage working pressure and the second-stage output pressure respectively, so that the operator can observe the change of the working pressure, judge the adjusting state, and meanwhile, the controller 5 can be continuously fed back and calibrated, so that the adjustment is more accurate and stable.
Example three:
the present embodiment is substantially the same as the first embodiment, except that: the compressor only comprises a second-stage gas-liquid separator 7, the gas outlet of the main compression engine 1 is directly communicated with the gas inlet of the second-stage main compression engine 2, and the gas outlet of the second-stage main compression engine 2 is communicated with the gas inlet of the second-stage gas-liquid separator 7.
The specific embodiments described herein are merely illustrative of the spirit of the invention. Various modifications or additions may be made to the described embodiments or alternatives may be employed by those skilled in the art without departing from the spirit or ambit of the invention as defined in the appended claims.
Claims (10)
1. The utility model provides a multistage frequency conversion screw air compressor, includes one-level compression host computer (1) and second grade compression host computer (2) that the gas circuit is established ties, its characterized in that, compressor still include inverter motor (3), inverter motor two (4) and can adjust controller (5) of inverter motor one (3) adaptability rotational speed and inverter motor two (4) adaptability rotational speed respectively along with using flow variation, controller (5) are connected with inverter motor one (3) and inverter motor two (4) electricity, the output shaft of inverter motor one (3) with the power input end of one-level compression host computer (1) is connected, the output shaft of inverter motor two (4) with the power input end of second grade compression host computer (2) is connected.
2. The multistage variable frequency screw air compressor according to claim 1, further comprising an air pressure sensor (15) capable of monitoring the output pressure of the primary compression main unit (1) and the output pressure of the secondary compression main unit (2), wherein the controller (5) is electrically connected with the air pressure sensor (15), the controller (5) is capable of regulating the rotation speed of the first variable frequency motor (3) and the second variable frequency motor (4) to increase when the pressure monitored by the air pressure sensor (15) is lower than a preset pressure, and the controller (5) is capable of regulating the rotation speed of the first variable frequency motor (3) and the second variable frequency motor (4) to decrease when the pressure monitored by the air pressure sensor (15) is higher than the preset pressure.
3. The multistage variable frequency screw air compressor according to claim 1, wherein the controller (5) stores therein constant pressure use flow rate-rotation rate curve data formed by corresponding respectively to the stable rotation rate of the inverter motor one (3) and the stable rotation rate of the inverter motor two (4) at different use flow rates under the constant pressure intake and constant pressure exhaust conditions of the two-stage compression main unit (2), and the controller (5) is capable of adjusting respectively the rotation rate of the inverter motor one (3) and the rotation rate of the inverter motor two (4) at the time of change of the use flow rate based on the constant pressure use flow rate-rotation rate curve data.
4. The multi-stage variable frequency screw air compressor according to claim 2, further comprising a first-stage gas-liquid separator (6), wherein the gas inlet of the first-stage gas-liquid separator (6) is communicated with the gas outlet of the first-stage main compression unit (1), the gas outlet of the first-stage gas-liquid separator (6) is communicated with the gas inlet of the second-stage main compression unit (2), and the controller (5) can control the second variable frequency motor (4) to accelerate firstly when the use flow rate is increased and control the first variable frequency motor (3) to decelerate firstly when the use flow rate is reduced.
5. The multistage variable frequency screw air compressor according to claim 2 or 3, further comprising a secondary gas-liquid separator (7), wherein the air outlet of the main compression unit (1) is directly communicated with the air inlet of the secondary main compression unit (2), and the air outlet of the secondary main compression unit (2) is communicated with the air inlet of the secondary gas-liquid separator (7).
6. The multistage variable-frequency screw air compressor as claimed in claim 4, further comprising a secondary gas-liquid separator (7), a primary filter (8) and a secondary filter (9), wherein an inlet of the primary filter (8) and an inlet of the secondary filter (9) are respectively communicated with a liquid discharge port of the primary gas-liquid separator (6) and a liquid discharge port of the secondary gas-liquid separator (7), the primary filter (8) is communicated with an inner cavity of the secondary compression main machine (2) through a first openable and closable liquid supply pipe (10), and a first pressure pump (11) capable of driving lubricating liquid to be conveyed towards the secondary compression main machine (2) is arranged in the middle section of the first liquid supply pipe (10); the compressor still include one end with the air inlet intercommunication of one-level compression host computer (1) and open closed fluid infusion pipe two (12), the other end and the external world intercommunication of fluid infusion pipe two (12), the middle section of this fluid infusion pipe two (12) is equipped with can drive the force (forcing) pump two (13) that lubricated liquid carried towards one-level compression host computer (1).
7. The multistage frequency conversion screw air compressor according to claim 6, wherein the first-stage gas-liquid separator (6) and the second-stage gas-liquid separator (7) are respectively connected with an openable liquid through pipe (14), an inner cavity of the first-stage gas-liquid separator (6) and an inner cavity of the second-stage gas-liquid separator (7) are respectively communicated with one end of the two liquid through pipes (14), and the other end of the two liquid through pipes (14) are both communicated with the outside.
8. The multi-stage variable-frequency screw air compressor according to claim 4, wherein the main compressor further comprises an air inlet pipe (16) communicated with the air inlet of the primary main compressor (1) and an air outlet pipe (17) communicated with the air outlet of the secondary gas-liquid separator (7), and an air inlet valve (18) capable of controlling the flow cross section is arranged at the air inlet of the primary main compressor (1); a one-way valve (19) is arranged between the air outlet of the primary gas-liquid separator (6) and the air inlet of the secondary compression main machine (2).
9. The multi-stage variable frequency screw air compressor according to claim 8, wherein there are two of said air pressure sensors (15), one of said air pressure sensors (15) being disposed on said one-stage gas-liquid separator (6), the other of said air pressure sensors (15) being disposed on said discharge pipe (17).
10. The multi-stage variable frequency screw air compressor according to claim 1, 2 or 3, wherein the bottom of the primary compression main machine (1), the bottom of the secondary compression main machine (2), the bottom of the variable frequency motor I (3) and the bottom of the variable frequency motor II (4) are provided with damping pads (20).
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202211253106.3A CN115405526A (en) | 2022-10-13 | 2022-10-13 | Multistage frequency conversion screw air compressor |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202211253106.3A CN115405526A (en) | 2022-10-13 | 2022-10-13 | Multistage frequency conversion screw air compressor |
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| Publication Number | Publication Date |
|---|---|
| CN115405526A true CN115405526A (en) | 2022-11-29 |
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202211253106.3A Pending CN115405526A (en) | 2022-10-13 | 2022-10-13 | Multistage frequency conversion screw air compressor |
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| Country | Link |
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| CN (1) | CN115405526A (en) |
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2022
- 2022-10-13 CN CN202211253106.3A patent/CN115405526A/en active Pending
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