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CN113294322B - Compressor system and control method thereof - Google Patents

Compressor system and control method thereof Download PDF

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Publication number
CN113294322B
CN113294322B CN202010112404.5A CN202010112404A CN113294322B CN 113294322 B CN113294322 B CN 113294322B CN 202010112404 A CN202010112404 A CN 202010112404A CN 113294322 B CN113294322 B CN 113294322B
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compressor
section
stage
controller
compressors
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CN113294322A (en
Inventor
吕明德
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Fusheng Industrial Shanghai Co ltd
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Fusheng Industrial Shanghai Co ltd
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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
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
    • F04B—POSITIVE-DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS
    • F04B39/00—Component parts, details, or accessories, of pumps or pumping systems specially adapted for elastic fluids, not otherwise provided for in, or of interest apart from, groups F04B25/00 - F04B37/00
    • F04B39/06—Cooling; Heating; Prevention of freezing
    • 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
    • F04B49/02—Stopping, starting, unloading or idling control
    • 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
    • F04B49/08—Regulating by delivery pressure
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
    • F04B—POSITIVE-DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS
    • 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
    • F04B49/20—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 by changing the driving speed
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
    • F04B—POSITIVE-DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS
    • F04B51/00—Testing machines, pumps, or pumping installations
    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02K—DYNAMO-ELECTRIC MACHINES
    • H02K11/00—Structural association of dynamo-electric machines with electric components or with devices for shielding, monitoring or protection
    • H02K11/20—Structural association of dynamo-electric machines with electric components or with devices for shielding, monitoring or protection for measuring, monitoring, testing, protecting or switching
    • H02K11/21—Devices for sensing speed or position, or actuated thereby
    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02P—CONTROL OR REGULATION OF ELECTRIC MOTORS, ELECTRIC GENERATORS OR DYNAMO-ELECTRIC CONVERTERS; CONTROLLING TRANSFORMERS, REACTORS OR CHOKE COILS
    • H02P5/00—Arrangements specially adapted for regulating or controlling the speed or torque of two or more electric motors
    • H02P5/74—Arrangements specially adapted for regulating or controlling the speed or torque of two or more electric motors controlling two or more AC dynamo-electric motors
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02B—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO BUILDINGS, e.g. HOUSING, HOUSE APPLIANCES OR RELATED END-USER APPLICATIONS
    • Y02B30/00—Energy efficient heating, ventilation or air conditioning [HVAC]
    • Y02B30/70—Efficient control or regulation technologies, e.g. for control of refrigerant flow, motor or heating

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  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Power Engineering (AREA)
  • Computer Hardware Design (AREA)
  • Microelectronics & Electronic Packaging (AREA)
  • Control Of Positive-Displacement Pumps (AREA)
  • Applications Or Details Of Rotary Compressors (AREA)

Abstract

The present invention relates to a compressor system and a control method thereof. The compressor system includes: the multi-stage compressor is sequentially connected between an air inlet and an air outlet from front to back; and the proportional synchronous controller is connected with the multi-stage compressor and is used for carrying out proportional synchronous control on the rotating speed of the rear-stage compressor according to the rotating speed of the front-stage compressor. The invention can achieve the function of boosting by controlling the multi-section compressor by using the proportional synchronous controller, so that the control is simplified, the whole set of configuration design is more flexible, the total operation energy consumption is lower, a relatively free nose and pressure collocation mode can be provided, the complicated gear box design and lubrication planning can be simplified, and the gear transmission loss is reduced.

Description

Compressor system and control method thereof
Technical Field
The present invention relates to a compressor system and a control method thereof, and more particularly, to a multi-stage compressor system.
Background
In the conventional multi-stage compressor system, two or more stages of compression are performed by a multi-stage compressor, and the intake pressure is compressed to the final discharge pressure to realize supercharging. However, the compression control of the existing multi-stage compressor system is complicated.
Thus, there is a need for a system that is simpler to control and more flexible to design.
Disclosure of Invention
In view of the above-mentioned drawbacks, the present invention is directed to a compressor system and a control method thereof, which can achieve a function of precisely pressurizing by proportional synchronous control, so that the control is simplified and the design is more flexible.
In order to achieve the above object, the present invention provides a compressor system comprising: the multi-stage compressor is sequentially connected between an air inlet and an air outlet from front to back; and the proportional synchronous controller is connected with the multi-stage compressor and is used for carrying out proportional synchronous control on the rotating speed of the rear-stage compressor according to the rotating speed of the front-stage compressor.
In an embodiment of the invention, the compressor system further comprises: an exhaust pressure sensor disposed corresponding to the exhaust port for sensing an exhaust pressure of the exhaust port; and a compressor controller connected to the proportional synchronous controller, the exhaust pressure sensor, and a first compressor of the multi-stage compressors for controlling a rotational speed of the first compressor.
In an embodiment of the present invention, each compressor in the multi-stage compressor is driven by driving a motor through a frequency converter, and the frequency converter corresponding to the first compressor in the multi-stage compressor is connected to the compressor controller, and the frequency converters corresponding to the other compressors in the multi-stage compressor are connected to the proportional synchronous controller.
In an embodiment of the present invention, each motor is further provided with an encoder, and the encoder is configured to output a rotational speed signal corresponding to each compressor to the proportional synchronous controller; and the proportional synchronous controller performs proportional calculation according to the rotating speed signal corresponding to the front-stage compressor and outputs the calculated rotating speed control signal to the frequency converter corresponding to the rear-stage compressor so as to perform proportional synchronous control on the rear-stage compressor.
In one embodiment of the present invention, the compressor controller is configured to control the first stage compressor to operate at a certain frequency; the proportion synchronous controller performs proportion calculation according to the rotating speed signal corresponding to the first section of compressor or the rotating speed signal corresponding to the previous section of compressor.
In an embodiment of the present invention, the compressor controller controls the first stage compressor to perform constant-pressure variable-frequency speed regulation according to the exhaust pressure and a pressure setting; the proportion synchronous controller performs proportion calculation according to the rotating speed signal corresponding to the first section of compressor or the rotating speed signal corresponding to the previous section of compressor.
In an embodiment of the present invention, the encoder is further configured to output a rotational speed feedback signal corresponding to each compressor segment to the proportional synchronous controller; and the proportional synchronous controller is a PID controller, and PID rotational speed control is carried out on the rear-stage compressor according to the rotational speed signal corresponding to the front-stage compressor and the rotational speed feedback signal corresponding to the rear-stage compressor.
In one embodiment of the present invention, the multi-stage compressors share one of the proportional synchronous controllers; alternatively, two adjacent compressors in the multi-stage compressor share one of the proportional synchronous controllers.
In an embodiment of the present invention, the ratio synchronization controller is further configured to adjust a multiple of ratio synchronization according to a target discharge pressure, the discharge pressure, or a target compression ratio of the front-stage compressor and the rear-stage compressor, so as to perform rotational speed control on the rear-stage compressor.
In an embodiment of the invention, the compressor system further comprises: the middle section pressure sensor is arranged between two adjacent sections of compressors in the multi-section compressor and is used for sensing the middle section pressure between the two adjacent sections of compressors; and the intermediate section pressure sensor controller is connected with the intermediate section pressure sensor and the proportion synchronous controller and is used for controlling the proportion synchronous controller to respectively adjust the rotating speed of the multi-section compressor according to the intermediate section pressure and a set pressure.
In an embodiment of the invention, the compressor system further comprises: the intermediate cooler is arranged between the two adjacent sections of compressors, and the intermediate section pressure sensor is arranged before or after the intermediate cooler; and/or a rear cooler arranged between a last stage compressor of the multi-stage compressors and the exhaust port, and the exhaust pressure sensor is arranged before or after the rear cooler; and/or an air inlet control valve which is correspondingly arranged behind the air inlet and is connected with the compressor controller; and/or a relief valve is arranged between the last stage compressor in the multi-stage compressors and the exhaust port and is connected with the compressor controller.
In order to achieve the above object, the present invention also provides a control method of a compressor system, comprising: providing a multi-section compressor, which is sequentially connected between an air inlet and an air outlet from front to back; and the proportion synchronous controller is connected with the multi-stage compressor and is used for carrying out proportion synchronous control on the rotating speed of the rear-stage compressor according to the rotating speed of the front-stage compressor.
In another embodiment of the present invention, the control method of the compressor system further includes: sensing an exhaust pressure of the exhaust port by an exhaust pressure sensor; and controlling, by a compressor controller, a rotational speed of a first stage compressor of the multi-stage compressors.
In another embodiment of the present invention, each of the compressors in the multi-stage compressor is driven by driving a motor through a frequency converter, and the frequency converter corresponding to the first compressor in the multi-stage compressor is connected to the compressor controller, and the frequency converters corresponding to the other compressors in the multi-stage compressor are connected to the proportional synchronous controller.
In another embodiment of the present invention, the control method of the compressor system further includes: outputting a rotating speed signal corresponding to each section of compressor to the proportional synchronous controller through an encoder; the proportional synchronous controller performs proportional calculation according to the rotating speed signal corresponding to the front-stage compressor, and outputs a calculated rotating speed control signal to the frequency converter corresponding to the rear-stage compressor so as to perform proportional synchronous control on the rear-stage compressor.
In another embodiment of the present invention, the compressor controller is configured to control the first stage compressor to operate at a certain frequency; the proportion synchronous controller performs proportion calculation according to the rotating speed signal corresponding to the first section of compressor or the rotating speed signal corresponding to the previous section of compressor.
In another embodiment of the present invention, the compressor controller controls the first stage compressor to perform constant-pressure variable-frequency speed regulation according to the exhaust pressure and a pressure setting; the proportion synchronous controller performs proportion calculation according to the rotating speed signal corresponding to the first section of compressor or the rotating speed signal corresponding to the previous section of compressor.
In another embodiment of the present invention, the control method of the compressor system further includes: outputting a rotating speed feedback signal corresponding to each section of compressor to the proportional synchronous controller through the encoder; the proportional synchronous controller is a PID controller, and PID rotational speed control is performed on the rear-stage compressor according to the rotational speed signal corresponding to the front-stage compressor and the rotational speed feedback signal corresponding to the rear-stage compressor.
In another embodiment of the present invention, the multi-stage compressors share one of the proportional synchronous controllers; alternatively, two adjacent compressors in the multi-stage compressor share one of the proportional synchronous controllers.
In another embodiment of the present invention, the control method of the compressor system further includes: and adjusting the multiple of the proportional synchronization according to the target exhaust pressure, the exhaust pressure or the target compression ratio of the front-stage compressor and the rear-stage compressor by the proportional synchronization controller so as to control the rotating speed of the rear-stage compressor.
In another embodiment of the present invention, the control method of the compressor system further includes: sensing a middle section pressure between two adjacent compressors of the multi-section compressors through a middle section pressure sensor arranged between the two adjacent compressors; and controlling the proportional synchronous controller to respectively adjust the rotating speeds of the multi-section compressors according to the pressure of the middle section and a set pressure by the pressure sensor controller of the middle section.
In another embodiment of the present invention, the control method of the compressor system further includes: providing an intercooler disposed between the adjacent two stages of compressors, wherein the intermediate stage pressure sensor is disposed before or after the intercooler; and/or providing a rear cooler disposed between a last stage compressor of the multi-stage compressor and the exhaust port, and the exhaust pressure sensor being disposed before or after the rear cooler; and/or controlling an air inlet control valve correspondingly arranged behind the air inlet through the compressor controller; and/or controlling a relief valve arranged between a last stage compressor of the multi-stage compressors and the exhaust port through the compressor controller.
In another embodiment of the present invention, the control method of the compressor system further includes: and when the multi-stage compressor is in an unloading state, respectively reducing the rotating speed of the multi-stage compressor or stopping the multi-stage compressor.
The invention can achieve the function of accurate pressurization by controlling the rotating speed of the multi-stage compressor through the proportional synchronous controller, so that the control is simpler and digitalized, the whole set of configuration design is more flexible, the total operation energy consumption is lower, a more free machine head and pressure collocation mode can be provided, the complicated gear box design and lubrication planning can be simplified, and the gear transmission loss is reduced.
Drawings
FIG. 1 is a schematic diagram of a two-stage compressor system according to a preferred embodiment of the present invention;
fig. 2 is a flow chart of a control method of the compressor system of the present invention.
Detailed Description
The present invention will be described in further detail with reference to the drawings and examples, in order to make the objects, technical solutions and advantages of the present invention more apparent. It should be understood that the specific embodiments described herein are for purposes of illustration only and are not intended to limit the scope of the invention.
As shown in fig. 1, there is shown a two-stage compressor system according to a preferred embodiment of the present invention, in which a first stage compressor 3 and a second stage compressor 11 are connected in sequence from front to rear between an intake port 1 and an exhaust port 19. And, the first stage compressor 3 and the second stage compressor 11 are respectively connected to a proportional synchronous controller 20, and the proportional synchronous controller 20 can perform proportional synchronous control on the rotation speed of the second stage compressor 11 according to the rotation speed of the first stage compressor 3; further, the proportional synchronous control of the rotational speed of the compressor means that the proportional synchronous controller outputs a calculated rotational speed control signal to control the rotational speed of the rear compressor after performing a proportional calculation according to the encoder rotational speed signal of the front compressor, so that the rotational speed of the front compressor and the rotational speed of the rear compressor have a fixed proportional relationship, wherein the proportional relationship can be adjusted according to the target exhaust pressure, the actual exhaust pressure or the target compression ratios of the front compressor and the rear compressor. While a two-stage compressor system is illustrated in the embodiment of fig. 1, it will be appreciated that in other embodiments, more stages of compressors may be included, such as a third stage of compressor may be further coupled after the second stage of compressor 11, and this is not a limitation of the present invention. Also, each compressor, for example, the first compressor 3 and the second compressor 11, may be optionally configured with different types of compressor heads; it is more suitable for various oil or oil-free screw machines and blowers.
In the embodiment shown in fig. 1, the compressor system further comprises an exhaust pressure sensor 18 and a compressor controller 21. Wherein the exhaust pressure sensor 18 is provided corresponding to the exhaust port 19 for sensing an exhaust pressure P1 of the exhaust port 19. The compressor controller 21 is connected to the proportional synchronous controller 20, the exhaust pressure sensor 18, and the first stage compressor 3, and is configured to control the rotational speed of the first stage compressor 3.
In the embodiment shown in fig. 1, the first stage inverter 6 may be used to drive the first stage motor 5 through the first stage transmission 4 to drive the first stage compressor 3, and the second stage inverter 15 may be used to drive the second stage motor 14 through the second stage transmission 12 to drive the second stage compressor 11. If a third-stage compressor exists, a third-stage frequency converter can be used for driving a third-stage motor to drive the third-stage compressor through a third-stage transmission device, and the like.
In this embodiment, the compressor controller 21 outputs a control signal CS1 according to the exhaust pressure P1 and a pressure setting to control the first stage compressor 3 to perform constant-pressure variable-frequency speed regulation. In other embodiments, the compressor controller 21 may also control the first stage compressor 3 to operate at a certain frequency. If the first stage compressor 3 is driven by variable frequency, constant voltage variable frequency control is performed; if the first stage compressor 3 is driven at a fixed frequency, the air inlet control valve 2 and/or the discharge valve 16 are/is used for loading and unloading or air inlet capacity adjustment control; the rotation speed of the second stage compressor 11 follows the rotation speed of the first stage compressor 3 to perform proportional synchronous speed regulation.
In the present invention, the proportional synchronous controller 20 may perform the proportional calculation according to the rotation speed signal (e.g. S1) corresponding to the first stage compressor 3 or the rotation speed signal (e.g. S1 or S2) corresponding to the previous stage compressor. For example, in the embodiment shown in fig. 1, the rotational speed of the second stage compressor 14 is controlled via the proportional synchronous controller 20, followed by the first stage compressor 3 for proportional synchronous operation. For example, assuming that the rated rotation speed of the second stage compressor 11 is 2 times that of the first stage compressor 3, when the first stage inverter 6 outputs 60Hz, the second stage inverter 15 outputs 120Hz; if the first stage frequency converter 6 outputs 50Hz, the second stage frequency converter 15 outputs 100Hz. If there is a third stage compressor, the third stage compressor may follow the first stage compressor 3 or the second stage compressor 11 for proportional synchronous operation via the proportional synchronous controller 20, and so on.
In order to achieve the function of proportional synchronization, a first section of encoder 8 and a second section of encoder 13 are respectively arranged on the first section of motor 5 and the second section of motor 14, and can output corresponding rotating speed signals S1 and S2 to a proportional synchronous controller 20. For example, the first section encoder 8 may output the rotation speed signal S1 corresponding to the first section compressor 3 to the proportional synchronous controller 20, then the proportional synchronous controller 20 performs proportional calculation and outputs the calculated rotation speed control signal CS2 to the second section inverter 15, the second section inverter 15 drives the second section motor 14 according to the calculated rotation speed control signal CS2, and the second section encoder 13 outputs the rotation speed signal S2 corresponding to the second section compressor 11 to the proportional synchronous controller 20, so that the proportional synchronous controller 20 may perform fine adjustment on the rotation speed control signal CS2 according to the feedback rotation speed signal S2, thereby enabling the second section compressor 11 to perform proportional synchronous operation along with the first section compressor 3. The proportional relationship between the rotation speed signal S1 and the rotation speed control signal CS2 may be adjusted according to the target exhaust pressure, the actual exhaust pressure, or the target compression ratios of the front-stage compressor and the rear-stage compressor.
In other embodiments, the proportional-synchronous controller 20 may be a PID controller (proportional-integral-derivative controller) that performs PID rotational speed control on the rear compressor according to a rotational speed signal corresponding to the front compressor and a rotational speed feedback signal corresponding to the rear compressor. For example, the first section encoder 8 outputs the rotation speed signal S1 corresponding to the first section compressor 3 to the proportional synchronous controller 20 for proportional calculation, the proportional synchronous controller 20 outputs the calculated rotation speed control signal CS2 to the second section inverter 15 for controlling the rotation speed of the second section motor 14, wherein the second section encoder 13 of the second section motor 14 can also feed back a rotation speed feedback signal to the proportional synchronous controller 20 for PID rotation speed control, so that the proportional synchronous controller 20 can finely adjust the rotation speed control signal CS2 according to the rotation speed feedback signal corresponding to the second section compressor 11, and thus the second section compressor 11 can perform proportional synchronous speed regulation according to the rotation speed signal S1 of the first section compressor 3 and the rotation speed feedback signal fed back by the second section encoder 13. If there is a third section of compressor, the second section of encoder 13 of the second section of motor 14 outputs the rotation speed signal S2 to the proportional synchronous controller 20 (or another proportional synchronous controller), then the proportional synchronous controller 20 (or another proportional synchronous controller) outputs the calculated rotation speed control signal to the third section of frequency converter, and the third section of frequency converter can drive the third section of motor by PID according to the calculated rotation speed control signal and the rotation speed feedback signal fed back by the third section of encoder, so that the third section of compressor can perform proportional synchronous speed regulation according to the rotation speed signal S2 of the second section of compressor 11 and the rotation speed feedback signal fed back by the third section of encoder. In other embodiments, the third-stage inverter of the third-stage compressor may also directly use the rotation speed signal S1 of the first-stage compressor 3 to perform proportional synchronous speed regulation according to practical applications, which is not a limitation of the present invention.
In the present invention, the proportional synchronous controller 20 may be further configured to adjust a multiple of proportional synchronous according to a target discharge pressure, an actual discharge pressure P1, or a target compression ratio of the front stage compressor and the rear stage compressor, so as to perform rotational speed control on the rear stage compressor. For example, at an exhaust pressure P1 of 7barg, the proportional synchronous ratio may be 1 to 2.0; at an exhaust pressure P1 of 10barg, the proportional synchronous ratio may be adjusted to 1 to 2.5.
In the present invention, since the intermediate pressure between the adjacent two compressors may deviate from the ideal design pressure due to the wear or arrangement of the compressor head, the intermediate pressure sensor 9 and the intermediate pressure sensor controller 10 may be installed on the intermediate pipeline between the adjacent two compressors. Wherein the intermediate stage pressure sensor 9 may be used to sense the intermediate stage pressure P2 between two adjacent stages of compressors (e.g., the first stage compressor 3 and the second stage compressor 11 in fig. 1). The intermediate section pressure sensor controller 10 may be connected to the intermediate section pressure sensor 9 and the proportional synchronous controller 20, and is configured to control the proportional synchronous controller 20 to adjust the rotational speeds of the compressors of the respective sections according to the intermediate section pressure P2 and a set pressure. For example, if the intermediate stage pressure P2 deviates from the set pressure, the intermediate stage pressure sensor controller 10 sends a signal C1 to the proportional synchronous controller 20, and the proportional synchronous controller 20 calculates and then instructs to properly raise or lower the rotational speed of the first stage compressor 3 or the second stage compressor 11 to achieve the preset optimal compression ratio.
In the embodiment shown in fig. 1, the compressor system may further comprise an intercooler 7, an aftercooler 17, an inlet control valve 2, and/or a bleed valve 16. The intercooler 7 may be arranged between two adjacent compressors (e.g. the first stage compressor 3 and the second stage compressor 11 in fig. 1), for example, and the intermediate stage pressure sensor 9 is arranged before or after the intercooler 7. The aftercooler 17 may be disposed, for example, between a final stage compressor (e.g., the second stage compressor 11 of fig. 1) and the exhaust port 19, and the exhaust pressure sensor 18 may be disposed before or after the aftercooler 17. The intake control valve 2 may be disposed, for example, after the intake port 1, and connected to the compressor controller 21, and the compressor controller 21 may control the intake control valve 2 by a control signal F1 to adjust the intake air amount. The bleed valve 16 may be disposed between a final stage compressor (e.g., the second stage compressor 11 in fig. 1) and the exhaust port 19, and connected to the compressor controller 21, and the compressor controller 21 may control the bleed valve 16 via a control signal F2 to perform bleed control of compressed air.
In the embodiment shown in fig. 1, when the compressor system is in an unloaded state, there is no need to maintain proportional synchronization, so that the compressor heads of each compressor section can be individually reduced to a suitable minimum rotational speed or even shut down to further reduce energy consumption during unloading.
Although the above description has been made taking the two-stage compressor system and the control method thereof as an example, it is understood that the above compressor system and the control method thereof are equally applicable to the multi-stage compressor system. For example, as shown in fig. 2, the control method of the compressor system of the present invention includes:
step S201, providing a multi-stage compressor, which is sequentially connected between an air inlet 1 and an air outlet 19 from front to back;
step S202, the rotation speed of the rear compressor is proportionally and synchronously controlled according to the rotation speed of the front compressor by the proportional synchronous controller 20 connected with the multi-stage compressor.
Further, the proportional synchronous control of the rotation speed of the rear compressor means that the proportional synchronous controller outputs a calculated rotation speed control signal to control the rotation speed of the rear compressor after performing proportional calculation according to the encoder rotation speed signal of the front compressor, so that the rotation speed of the front compressor and the rotation speed of the rear compressor have a fixed proportional relationship, wherein the proportional relationship can be adjusted according to the target exhaust pressure, the actual exhaust pressure or the target compression ratio of the front compressor and the rear compressor.
In the control method, one or more first-stage compressors 3 may be used to correspond to one or more second-stage compressors 11, and one or more third-stage compressors may be used. The motor of each section of compressor can use induction motor or permanent magnet motor, and the form of compressor aircraft nose also can match wantonly, more applicable to various forms have oily or oilless screw rod machine and air-blower. In addition, the multistage compressor system and the control method thereof of the present invention can also be used for vacuum pump series connection.
The invention can achieve the function of accurate pressurization by controlling the multi-stage compressor by using the proportional synchronous controller, so that the control is simplified, the whole set of configuration design is more flexible, the total operation energy consumption is lower, a relatively free nose and pressure collocation mode can be provided, the complicated gear box design and lubrication planning can be simplified, and the gear transmission loss is reduced.
The present invention provides a compressor system comprising: the multi-stage compressor is sequentially connected between an air inlet and an air outlet from front to back; and the proportional synchronous controller is connected with the multi-stage compressor and is used for carrying out proportional synchronous control on the rotating speed of the rear-stage compressor according to the rotating speed of the front-stage compressor.
Preferably, the compressor system further comprises: an exhaust pressure sensor disposed corresponding to the exhaust port for sensing an exhaust pressure of the exhaust port; and a compressor controller connected to the proportional synchronous controller, the exhaust pressure sensor, and a first compressor of the multi-stage compressors for controlling a rotational speed of the first compressor.
Preferably, each compressor in the multi-stage compressors is driven by driving a motor through a frequency converter, the frequency converter corresponding to the first compressor in the multi-stage compressors is connected with the compressor controller, and the frequency converters corresponding to other compressors in the multi-stage compressors are connected with the proportional synchronous controller.
Preferably, each motor is further provided with an encoder for outputting a rotation speed signal corresponding to each section of compressor to the proportional synchronous controller; and the proportional synchronous controller performs proportional calculation according to the rotating speed signal corresponding to the front-stage compressor and outputs the calculated rotating speed control signal to the frequency converter corresponding to the rear-stage compressor so as to perform proportional synchronous control on the rear-stage compressor.
Preferably, the compressor controller is configured to control the first stage compressor to operate at a certain frequency; the proportion synchronous controller performs proportion calculation according to the rotating speed signal corresponding to the first section of compressor or the rotating speed signal corresponding to the previous section of compressor.
Preferably, the compressor controller controls the first section of compressor to perform constant-pressure variable-frequency speed regulation according to the exhaust pressure and a pressure setting; the proportion synchronous controller performs proportion calculation according to the rotating speed signal corresponding to the first section of compressor or the rotating speed signal corresponding to the previous section of compressor.
Further, if the first stage compressor is driven by variable frequency, the compressor is controlled by constant voltage and variable frequency; if the first compressor is driven at a fixed frequency, the air inlet control valve and/or the bleeder valve are/is suitable for loading and unloading or air inlet capacity adjustment control; the rotation speed of the second section of compressor follows the rotation speed of the first section of compressor to realize proportional synchronous speed regulation.
Preferably, the encoder is further configured to output a rotational speed feedback signal corresponding to each compressor segment to the proportional synchronous controller; and the proportional synchronous controller is a PID controller, and PID rotational speed control is carried out on the rear-stage compressor according to the rotational speed signal corresponding to the front-stage compressor and the rotational speed feedback signal corresponding to the rear-stage compressor.
Preferably, said multi-stage compressors share one said proportional synchronous controller; alternatively, two adjacent compressors in the multi-stage compressor share one of the proportional synchronous controllers.
Preferably, the ratio synchronization controller is further configured to adjust the ratio synchronization by a multiple of a target discharge pressure, the discharge pressure, or the target compression ratio of the front stage compressor and the rear stage compressor, so as to perform rotational speed control on the rear stage compressor. For example, at an exhaust pressure P1 of 7barg, the proportional synchronous ratio may be 1 to 2.0; at an exhaust pressure P1 of 10barg, the proportional synchronous ratio may be adjusted to 1 to 2.5.
Preferably, the compressor system further comprises: the middle section pressure sensor is arranged between two adjacent sections of compressors in the multi-section compressor and is used for sensing the middle section pressure between the two adjacent sections of compressors; and the intermediate section pressure sensor controller is connected with the intermediate section pressure sensor and the proportion synchronous controller and is used for controlling the proportion synchronous controller to respectively adjust the rotating speed of the multi-section compressor according to the intermediate section pressure and a set pressure.
Preferably, the compressor system further comprises: the intermediate cooler is arranged between the two adjacent sections of compressors, and the intermediate section pressure sensor is arranged before or after the intermediate cooler; and/or a rear cooler arranged between a last stage compressor of the multi-stage compressors and the exhaust port, and the exhaust pressure sensor is arranged before or after the rear cooler; and/or an air inlet control valve which is correspondingly arranged behind the air inlet and is connected with the compressor controller; and/or a relief valve is arranged between the last stage compressor in the multi-stage compressors and the exhaust port and is connected with the compressor controller.
The invention also provides a control method of the compressor system, which comprises the following steps: providing a multi-section compressor, which is sequentially connected between an air inlet and an air outlet from front to back; and the proportion synchronous controller is connected with the multi-stage compressor and is used for carrying out proportion synchronous control on the rotating speed of the rear-stage compressor according to the rotating speed of the front-stage compressor.
Further, the proportional synchronous control of the rotation speed of the rear compressor means that the proportional synchronous controller outputs a calculated rotation speed control signal to control the rotation speed of the rear compressor after performing proportional calculation according to the encoder rotation speed signal of the front compressor, so that the rotation speed of the front compressor and the rotation speed of the rear compressor have a fixed proportional relationship, wherein the proportional relationship can be adjusted according to the target exhaust pressure, the actual exhaust pressure or the target compression ratio of the front compressor and the rear compressor.
Preferably, the control method of the compressor system further comprises: sensing an exhaust pressure of the exhaust port by an exhaust pressure sensor; and controlling, by a compressor controller, a rotational speed of a first stage compressor of the multi-stage compressors.
Preferably, each compressor in the multi-stage compressors is driven by driving a motor through a frequency converter, the frequency converter corresponding to the first compressor in the multi-stage compressors is connected with the compressor controller, and the frequency converters corresponding to other compressors in the multi-stage compressors are connected with the proportional synchronous controller.
Preferably, the control method of the compressor system further comprises: outputting a rotating speed signal corresponding to each section of compressor to the proportional synchronous controller through an encoder; the proportional synchronous controller performs proportional calculation according to the rotating speed signal corresponding to the front-stage compressor, and outputs a calculated rotating speed control signal to the frequency converter corresponding to the rear-stage compressor so as to perform proportional synchronous control on the rear-stage compressor. For example, the first section encoder may output a rotation speed signal corresponding to the first section compressor 3 to the proportional synchronous controller 20, then the proportional synchronous controller 20 performs proportional calculation and outputs a calculated rotation speed control signal to the second section frequency converter, the second section frequency converter drives the second section motor according to the calculated rotation speed control signal, and the second section encoder outputs a rotation speed signal corresponding to the second section compressor 11 to the proportional synchronous controller 20, so that the proportional synchronous controller 20 may perform fine adjustment on the rotation speed control signal according to the feedback rotation speed signal, thereby enabling the second section compressor 11 to perform proportional synchronous operation following the first section compressor 3. The proportional relation between the rotation speed signal and the rotation speed control signal can be adjusted according to the target exhaust pressure, the actual exhaust pressure or the target compression ratio of the front-stage compressor and the rear-stage compressor.
Preferably, the compressor controller is configured to control the first stage compressor to operate at a certain frequency; the proportion synchronous controller performs proportion calculation according to the rotating speed signal corresponding to the first section of compressor or the rotating speed signal corresponding to the previous section of compressor.
Preferably, the compressor controller controls the first section of compressor to perform constant-pressure variable-frequency speed regulation according to the exhaust pressure and a pressure setting; the proportion synchronous controller performs proportion calculation according to the rotating speed signal corresponding to the first section of compressor or the rotating speed signal corresponding to the previous section of compressor.
Further, if the first stage compressor is driven by variable frequency, the compressor is controlled by constant voltage and variable frequency; if the first compressor is driven at a fixed frequency, the air inlet control valve and/or the bleeder valve are/is suitable for loading and unloading or air inlet capacity adjustment control; the rotation speed of the second section of compressor follows the rotation speed of the first section of compressor to realize proportional synchronous speed regulation.
Preferably, the control method of the compressor system further comprises: outputting a rotating speed feedback signal corresponding to each section of compressor to the proportional synchronous controller through the encoder; the proportional synchronous controller is a PID controller, and PID rotational speed control is performed on the rear-stage compressor according to the rotational speed signal corresponding to the front-stage compressor and the rotational speed feedback signal corresponding to the rear-stage compressor. For example, the first section encoder outputs a rotation speed signal corresponding to the first section compressor 3 to the proportional synchronous controller 20 for proportional calculation, the proportional synchronous controller 20 outputs a calculated rotation speed control signal to the second section frequency converter to control the rotation speed of the second section motor, wherein the second section encoder of the second section motor can also feed back a rotation speed feedback signal to the proportional synchronous controller 20 for PID rotation speed control, so that the proportional synchronous controller 20 can finely adjust the rotation speed control signal according to the rotation speed feedback signal corresponding to the second section compressor 11, and the second section compressor 11 can perform proportional synchronous speed regulation according to the rotation speed signal of the first section compressor 3 and the rotation speed feedback signal fed back by the second section encoder. If the third section of compressor is provided, the second section of encoder of the second section of motor outputs a rotation speed signal to the proportional synchronous controller 20 (or another proportional synchronous controller), then the proportional synchronous controller 20 (or another proportional synchronous controller) outputs a calculated rotation speed control signal to the third section of frequency converter, and the third section of frequency converter can drive the third section of motor by PID according to the calculated rotation speed control signal and the rotation speed feedback signal fed back by the third section of encoder, so that the third section of compressor can perform proportional synchronous speed regulation according to the rotation speed signal of the second section of compressor 11 and the rotation speed feedback signal fed back by the third section of encoder. In other embodiments, the third-stage inverter of the third-stage compressor may also directly use the rotation speed signal of the first-stage compressor 3 to perform proportional synchronous speed regulation according to practical applications, which is not a limitation of the present invention.
Preferably, said multi-stage compressors share one said proportional synchronous controller; alternatively, two adjacent compressors in the multi-stage compressor share one of the proportional synchronous controllers.
Preferably, the control method of the compressor system further comprises: and adjusting the multiple of the proportional synchronization according to the target exhaust pressure, the exhaust pressure or the target compression ratio of the front-stage compressor and the rear-stage compressor by the proportional synchronization controller so as to control the rotating speed of the rear-stage compressor. For example, at an exhaust pressure P1 of 7barg, the proportional synchronous ratio may be 1 to 2.0; at an exhaust pressure P1 of 10barg, the proportional synchronous ratio may be adjusted to 1 to 2.5.
Preferably, the control method of the compressor system further comprises: sensing a middle section pressure between two adjacent compressors of the multi-section compressors through a middle section pressure sensor arranged between the two adjacent compressors; and controlling the proportional synchronous controller to respectively adjust the rotating speeds of the multi-section compressors according to the pressure of the middle section and a set pressure by the pressure sensor controller of the middle section. For example, if the intermediate stage pressure deviates from the set pressure, the intermediate stage pressure sensor controller sends a signal to the proportional synchronous controller 20, and the proportional synchronous controller 20 calculates and then instructs to properly raise or lower the rotational speed of the first stage compressor 3 or the second stage compressor 11 to achieve the preset optimal compression ratio.
Preferably, the control method of the compressor system further comprises: providing an intercooler disposed between the adjacent two stages of compressors, wherein the intermediate stage pressure sensor is disposed before or after the intercooler; and/or providing a rear cooler disposed between a last stage compressor of the multi-stage compressor and the exhaust port, and the exhaust pressure sensor being disposed before or after the rear cooler; and/or controlling an air inlet control valve correspondingly arranged behind the air inlet through the compressor controller; and/or controlling a relief valve arranged between a last stage compressor of the multi-stage compressors and the exhaust port through the compressor controller.
Preferably, the control method of the compressor system further comprises: and when the multi-stage compressor is in an unloading state, respectively reducing the rotating speed of the multi-stage compressor or stopping the multi-stage compressor.
Of course, the present invention is capable of other various embodiments and its several details are capable of modification and variation in light of the present invention, as will be apparent to those skilled in the art, without departing from the spirit and scope of the invention as defined in the appended claims.

Claims (17)

1. A compressor system, comprising:
the multi-stage compressor is sequentially connected between an air inlet and an air outlet from front to back;
the proportional synchronous controller is connected with the multi-stage compressor and is used for carrying out proportional synchronous control on the rotating speed of the rear-stage compressor according to the actual rotating speed of the front-stage compressor;
an exhaust pressure sensor disposed corresponding to the exhaust port for sensing an exhaust pressure of the exhaust port;
the compressor controller is connected with the proportional synchronous controller, the exhaust pressure sensor and a first section of compressors in the multi-section compressor and is used for controlling the rotating speed of the first section of compressors;
each section of compressors in the multi-section compressors is driven by driving a motor through a frequency converter, and each motor is also provided with an encoder for outputting a rotating speed signal corresponding to each section of compressors to the proportional synchronous controller; the proportional synchronous controller performs proportional calculation according to the rotating speed signal corresponding to the front-stage compressor and outputs a calculated rotating speed control signal to the frequency converter corresponding to the rear-stage compressor so as to perform proportional synchronous control on the rear-stage compressor;
the encoder is also used for outputting a rotating speed feedback signal corresponding to each section of compressor to the proportional synchronous controller; and the proportional synchronous controller is a PID controller, and PID rotational speed control is carried out on the rear-stage compressor according to the rotational speed signal corresponding to the front-stage compressor and the rotational speed feedback signal corresponding to the rear-stage compressor.
2. The compressor system of claim 1, wherein the inverter corresponding to the first compressor of the multi-stage compressors is connected to the compressor controller and the inverters corresponding to the other compressors of the multi-stage compressors are connected to the proportional synchronous controller.
3. The compressor system of claim 1 wherein the compressor controller is to control the first stage compressor to operate at a frequency; the proportion synchronous controller performs proportion calculation according to the rotating speed signal corresponding to the first section of compressor or the rotating speed signal corresponding to the previous section of compressor.
4. The compressor system of claim 1 wherein the compressor controller controls the first stage compressor to perform constant pressure variable frequency speed control based on the discharge pressure and a pressure setting; the proportion synchronous controller performs proportion calculation according to the rotating speed signal corresponding to the first section of compressor or the rotating speed signal corresponding to the previous section of compressor.
5. The compressor system of claim 1 wherein the multi-stage compressors share one of the proportional synchronous controllers; alternatively, two adjacent compressors in the multi-stage compressor share one of the proportional synchronous controllers.
6. The compressor system of claim 1, wherein the proportional synchronous controller is further configured to adjust a multiple of proportional synchronous based on a target discharge pressure, the discharge pressure, or a target compression ratio of the front stage compressor and the rear stage compressor to control a rotational speed of the rear stage compressor.
7. The compressor system of any one of claims 2 to 6, further comprising:
the middle section pressure sensor is arranged between two adjacent sections of compressors in the multi-section compressor and is used for sensing the middle section pressure between the two adjacent sections of compressors;
and the intermediate section pressure sensor controller is connected with the intermediate section pressure sensor and the proportion synchronous controller and is used for controlling the proportion synchronous controller to respectively adjust the rotating speed of the multi-section compressor according to the intermediate section pressure and a set pressure.
8. The compressor system of claim 7, further comprising:
the intermediate cooler is arranged between the two adjacent sections of compressors, and the intermediate section pressure sensor is arranged before or after the intermediate cooler; and/or
The rear cooler is arranged between the last stage compressor of the multi-stage compressors and the exhaust port, and the exhaust pressure sensor is arranged before or after the rear cooler; and/or
The air inlet control valve is correspondingly arranged behind the air inlet and is connected with the compressor controller; and/or
And the relief valve is arranged between the last section of compressor in the multi-section compressor and the exhaust port and is connected with the compressor controller.
9. A control method of a compressor system, comprising:
providing a multi-section compressor, which is sequentially connected between an air inlet and an air outlet from front to back;
the rotation speed of the rear-stage compressor is proportionally and synchronously controlled according to the actual rotation speed of the front-stage compressor by a proportional synchronous controller connected with the multi-stage compressor;
sensing an exhaust pressure of the exhaust port by an exhaust pressure sensor;
controlling the rotation speed of a first section of compressors in the multi-section compressors through a compressor controller;
each section of compressors in the multi-section compressors is driven by driving a motor through a frequency converter, and a rotating speed signal corresponding to each section of compressors is output to the proportional synchronous controller through an encoder;
the proportional synchronous controller performs proportional calculation according to the rotating speed signal corresponding to the front-stage compressor and outputs a calculated rotating speed control signal to the frequency converter corresponding to the rear-stage compressor so as to perform proportional synchronous control on the rear-stage compressor;
outputting the corresponding rotating speed feedback signals of the compressors of each section to the proportional synchronous controller through the encoder,
the proportional synchronous controller is a PID controller, and PID rotational speed control is performed on the rear-stage compressor according to the rotational speed signal corresponding to the front-stage compressor and the rotational speed feedback signal corresponding to the rear-stage compressor.
10. The method of controlling a compressor system according to claim 9, wherein a frequency converter corresponding to the first stage of the multi-stage compressors is connected to the compressor controller, and frequency converters corresponding to other stages of the multi-stage compressors are connected to the proportional synchronous controller.
11. The method of controlling a compressor system according to claim 9, wherein the compressor controller is configured to control the first stage compressor to operate at a certain frequency; the proportion synchronous controller performs proportion calculation according to the rotating speed signal corresponding to the first section of compressor or the rotating speed signal corresponding to the previous section of compressor.
12. The method of claim 9, wherein said compressor controller controls said first stage compressor to perform constant pressure variable frequency speed regulation according to said discharge pressure and a pressure setting; the proportion synchronous controller performs proportion calculation according to the rotating speed signal corresponding to the first section of compressor or the rotating speed signal corresponding to the previous section of compressor.
13. The control method of a compressor system according to claim 9, wherein said multi-stage compressors share one of said proportional synchronous controllers; alternatively, two adjacent compressors in the multi-stage compressor share one of the proportional synchronous controllers.
14. The control method of a compressor system according to claim 13, further comprising:
and adjusting the multiple of the proportional synchronization according to the target exhaust pressure, the exhaust pressure or the target compression ratio of the front-stage compressor and the rear-stage compressor by the proportional synchronization controller so as to control the rotating speed of the rear-stage compressor.
15. The control method of a compressor system according to any one of claims 9 to 14, further comprising:
sensing a middle section pressure between two adjacent compressors of the multi-section compressors through a middle section pressure sensor arranged between the two adjacent compressors;
and controlling the proportional synchronous controller to respectively adjust the rotating speeds of the multi-section compressors according to the pressure of the middle section and a set pressure by the pressure sensor controller of the middle section.
16. The control method of a compressor system according to claim 15, further comprising:
providing an intercooler disposed between the adjacent two stages of compressors, wherein the intermediate stage pressure sensor is disposed before or after the intercooler; and/or
Providing a rear cooler disposed between a last stage compressor of the multi-stage compressor and the exhaust port, and the exhaust pressure sensor being disposed before or after the rear cooler; and/or
Controlling an air inlet control valve correspondingly arranged behind the air inlet through the compressor controller; and/or
And controlling a discharge valve arranged between a last stage compressor in the multi-stage compressors and the exhaust port through the compressor controller.
17. The method of controlling a compressor system according to claim 16, further comprising:
and when the multi-stage compressor is in an unloading state, respectively reducing the rotating speed of the multi-stage compressor or stopping the multi-stage compressor.
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JPH1137053A (en) * 1997-07-23 1999-02-09 Ishikawajima Harima Heavy Ind Co Ltd Control method of inverter driven multi-stage compressor
BE1012944A3 (en) * 1999-10-26 2001-06-05 Atlas Copco Airpower Nv MULTISTAGE COMPRESSOR UNIT AND METHOD FOR CONTROLLING ONE OF EQUAL MORE stage compressor unit.
JP3751208B2 (en) * 2001-02-23 2006-03-01 株式会社神戸製鋼所 Control method of multistage variable speed compressor
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