CN117108540B - Anti-surge pressure-maintaining control method and system for magnetic suspension blower - Google Patents

Anti-surge pressure-maintaining control method and system for magnetic suspension blower Download PDF

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Publication number
CN117108540B
CN117108540B CN202311315072.0A CN202311315072A CN117108540B CN 117108540 B CN117108540 B CN 117108540B CN 202311315072 A CN202311315072 A CN 202311315072A CN 117108540 B CN117108540 B CN 117108540B
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China
Prior art keywords
pressure
magnetic suspension
blower
surge
valve
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CN202311315072.0A
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CN117108540A (en
Inventor
李永胜
张海刚
刘辉
高亚
刘明波
王增鑫
吕前阔
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Shandong Tianrui Heavy Industry Co Ltd
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Shandong Tianrui Heavy Industry Co Ltd
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Classifications

    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
    • F04D—NON-POSITIVE-DISPLACEMENT PUMPS
    • F04D27/00—Control, e.g. regulation, of pumps, pumping installations or pumping systems specially adapted for elastic fluids
    • F04D27/02—Surge control
    • F04D27/0207—Surge control by bleeding, bypassing or recycling fluids
    • F04D27/0223—Control schemes therefor
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
    • F04D—NON-POSITIVE-DISPLACEMENT PUMPS
    • F04D27/00—Control, e.g. regulation, of pumps, pumping installations or pumping systems specially adapted for elastic fluids
    • F04D27/02—Surge control
    • F04D27/0207—Surge control by bleeding, bypassing or recycling fluids
    • F04D27/0215—Arrangements therefor, e.g. bleed or by-pass valves

Abstract

The disclosure relates to an anti-surge pressure-maintaining control method and system for a magnetic suspension blower, and relates to the field of magnetic suspension blowers. When the pressure maintaining function of the magnetic suspension blower is not started or the rotating speed of the magnetic suspension blower is smaller than the set rotating speed, acquiring the actual flow of the magnetic suspension blower; when the actual flow is smaller than the surge fitting flow, controlling a valve of a release valve of the magnetic suspension blower to be opened; when the actual flow is greater than or equal to the surge fitting flow, controlling the valve of the bleed valve to be closed; when the pressure-keeping function is started and the rotating speed reaches the set rotating speed, the outlet pressure of the magnetic suspension blower is obtained; when the outlet pressure is greater than the pressure protection value, controlling the valve of the air release valve to be opened; and when the outlet pressure is less than or equal to the pressure protection value, controlling the valve of the air release valve to be closed. The flow and the outlet pressure are used as conditions for judging surge at different rotating speeds, and the pressure is kept at a higher value by controlling the air release valve switch, so that the normal state can be ensured to be operated without stopping and maintaining pressure.

Description

Anti-surge pressure-maintaining control method and system for magnetic suspension blower
Technical Field
The disclosure relates to the field of magnetic suspension blowers, in particular to an anti-surge pressure maintaining control method and system of a magnetic suspension blower.
Background
In the cement production process, a raw material homogenizing warehouse is needed to homogenize and store the grinding raw materials with complex components before entering a kiln, so that the fluctuation of each component is reduced, the quality of the raw materials entering the kiln is ensured, and the stability of clinker is improved. The raw materials in the raw material homogenizing warehouse are blown through by adopting the magnetic suspension blower, so that materials are fully mixed, when the magnetic suspension blower does not give out air in the earlier stage, the outlet pressure is high, the pressure at the outlet after the air is given out is reduced, and the fluctuation process can enable the magnetic suspension blower to sink into the abnormal working condition of surging. Surging is an abnormal working condition that occurs when the flow of the blower is reduced to the minimum value allowed by the blower, and the drastic surging can cause the air supply parameter to fluctuate greatly, damage the stability of the process and even generate the gas backflow phenomenon, meanwhile, the machine body is enabled to vibrate strongly and the noise is enhanced, friction and collision of machine parts are caused, and the normal operation of the blower is affected.
At present, the working condition of the blower is mainly regulated by detecting fluctuation of parameters such as flow, pressure, temperature and the like, whether the surge critical is reached is judged based on the flow in the conventional operation, the flow is calculated through the inlet pressure and the temperature, the calculated flow is compared with the surge flow fitted according to the surge line, and if the calculated flow is smaller than the surge flow, the surge occurs. In order to protect equipment from surge damage, the allowance can be amplified to the maximum extent, and a valve is opened in advance to relieve pressure under the conditions of smaller flow and larger pressure, so that the pressure can not be maintained, but the homogenization effect of a homogenization warehouse of a cement plant can be weakened by doing so; if the lower limit of the protection flow is lowered to control the required pressure, the protection performance of the equipment is sacrificed, so that the pressure of the magnetic suspension blower exceeds the bearing capacity, and the surge protection is not effective, and the risk of damaging the equipment is generated.
Disclosure of Invention
In order to overcome the problems in the related art, the present disclosure provides an anti-surge pressure-maintaining control method and system for a magnetic levitation blower.
According to a first aspect of embodiments of the present disclosure, there is provided an anti-surge pressure-maintaining control method of a magnetic levitation blower, the method comprising:
acquiring the actual flow of the magnetic suspension blower under the condition that the pressure maintaining function of the magnetic suspension blower is not started or the rotating speed of the magnetic suspension blower is smaller than the set rotating speed;
when the actual flow is smaller than the surge fitting flow, controlling a valve of a bleed valve of the magnetic suspension blower to be opened;
when the actual flow is greater than or equal to the surge fitting flow, controlling a valve of the bleed valve to be closed;
acquiring the outlet pressure of the magnetic suspension blower under the condition that the pressure maintaining function of the magnetic suspension blower is started and the rotating speed of the magnetic suspension blower reaches the set rotating speed;
when the outlet pressure is greater than a pressure protection value, controlling the valve of the air release valve to be opened;
and when the outlet pressure is smaller than or equal to the pressure protection value, controlling the valve of the air release valve to be closed.
In some embodiments, the obtaining the actual flow of the magnetic levitation blower includes:
acquiring inlet pressure and inlet temperature of the magnetic suspension blower;
the actual flow is calculated based on the inlet pressure and the inlet temperature.
In some embodiments, the method further comprises:
and determining the surging fitting flow corresponding to the outlet pressure of the magnetic suspension blower at the inlet pressure based on a surging curve, wherein the surging curve is used for indicating the corresponding relation between the surging fitting flow and the outlet pressure at a surging critical point without surging.
In some embodiments, the pressure protection value is less than a maximum pressure value that the maglev blower can achieve at the set rotational speed.
In some embodiments, the method further comprises:
and under the condition that the pressure maintaining function is started, when the actual flow is smaller than the lower limit of flow protection, controlling the valve of the air release valve to be opened.
In some embodiments, the method further comprises:
when the magnetic suspension blower receives a shutdown instruction, the pressure maintaining function is closed, and the valve of the air release valve is opened to the maximum;
and when the outlet pressure of the magnetic suspension blower is reduced to a preset pressure, controlling the magnetic suspension blower to stop.
According to a second aspect of embodiments of the present disclosure, there is provided an anti-surge pressure-maintaining control system of a magnetic levitation blower for executing the anti-surge pressure-maintaining control method of the magnetic levitation blower according to the first aspect, the anti-surge pressure-maintaining control system comprising:
the anti-surge pressure maintaining controller is used for sending a control instruction to the air release valve, wherein the control instruction is determined according to the actual flow and the surge fitting flow of the magnetic suspension blower when the pressure maintaining function of the magnetic suspension blower is not started or the rotating speed of the magnetic suspension blower is smaller than the set rotating speed, and the control instruction is determined according to the outlet pressure and the pressure protection value when the pressure maintaining function of the magnetic suspension blower is started and the rotating speed of the magnetic suspension blower reaches the set rotating speed;
and the release valve is positioned at the outlet of the magnetic suspension blower and is used for controlling the valve of the release valve to be opened or closed according to the control instruction sent by the anti-surge pressure maintaining controller.
In some embodiments, the anti-surge dwell control system further includes:
and the pressure maintaining function switch is used for selecting whether to start the pressure maintaining function of the magnetic suspension blower.
In some embodiments, the anti-surge dwell control system further includes:
the temperature sensor is positioned at the inlet of the magnetic suspension blower, is used for detecting the inlet temperature of the magnetic suspension blower and sending the inlet temperature to the anti-surge pressure-maintaining controller;
the inlet pressure sensor is positioned at the inlet of the magnetic suspension blower, and is used for detecting the inlet pressure of the magnetic suspension blower and sending the inlet pressure to the anti-surge pressure-maintaining controller;
the outlet pressure sensor is positioned at the outlet of the magnetic suspension blower, is used for detecting the outlet pressure of the magnetic suspension blower and sending the outlet pressure to the anti-surge pressure-maintaining controller;
the speed sensor is positioned on the rotor of the magnetic suspension blower, and is used for detecting the rotating speed of the magnetic suspension blower and sending the rotating speed to the anti-surge pressure-maintaining controller.
In some embodiments, the anti-surge dwell controller is to:
acquiring the actual flow of the magnetic suspension blower under the condition that the pressure maintaining function of the magnetic suspension blower is not started or the rotating speed of the magnetic suspension blower is smaller than the set rotating speed;
when the actual flow is smaller than the surge fitting flow, sending an opening instruction to the relief valve so as to control the valve opening of the relief valve;
when the actual flow is greater than or equal to the surge fitting flow, sending a closing instruction to the relief valve so as to control the valve of the relief valve to be closed;
acquiring the outlet pressure of the magnetic suspension blower under the condition that the pressure maintaining function of the magnetic suspension blower is started and the rotating speed of the magnetic suspension blower reaches the set rotating speed;
when the outlet pressure is greater than the pressure protection value, sending an opening instruction to the air release valve so as to control the valve opening of the air release valve;
and when the outlet pressure is smaller than or equal to the pressure protection value, sending a closing instruction to the air release valve so as to control the valve of the air release valve to be closed.
The method has the following beneficial effects:
according to the method provided by the embodiment of the disclosure, the actual flow of the magnetic suspension blower can be obtained under the condition that the pressure maintaining function of the magnetic suspension blower is not started or the rotating speed of the magnetic suspension blower is smaller than the set rotating speed; when the actual flow is smaller than the surge fitting flow, controlling a valve of a release valve of the magnetic suspension blower to be opened; when the actual flow is greater than or equal to the surge fitting flow, controlling the valve of the bleed valve to be closed; under the condition that the pressure-keeping function is started and the rotating speed reaches the set rotating speed, the outlet pressure of the magnetic suspension blower is obtained; when the outlet pressure is greater than the pressure protection value, controlling the valve of the air release valve to be opened; and when the outlet pressure is less than or equal to the pressure protection value, controlling the valve of the air release valve to be closed. The flow and the outlet pressure are separately used as the judgment conditions of surging at different rotating speeds, the flow is used as the judgment conditions of surging at a lower rotating speed, the outlet pressure is used as the judgment conditions of surging at a higher rotating speed, and the outlet pressure is kept at a higher value by controlling the opening and closing of the relief valve, so that the magnetic suspension blower can be operated without stopping and maintaining pressure while surging does not occur.
It is to be understood that both the foregoing general description and the following detailed description are exemplary and explanatory only and are not restrictive of the disclosure.
Drawings
The accompanying drawings, which are incorporated in and constitute a part of this specification, illustrate embodiments consistent with the disclosure and together with the description, serve to explain the principles of the disclosure.
FIG. 1 is a flow chart illustrating an anti-surge dwell control method of a magnetic levitation blower according to an exemplary embodiment;
FIG. 2 is a flow chart illustrating another anti-surge dwell control method of a magnetic levitation blower according to an exemplary embodiment;
FIG. 3 is a flow chart illustrating yet another anti-surge dwell control method of a magnetic levitation blower according to an exemplary embodiment;
FIG. 4 is a flow chart illustrating yet another anti-surge dwell control method of a magnetic levitation blower according to an exemplary embodiment;
FIG. 5 is a schematic diagram illustrating an anti-surge dwell control system for a magnetic levitation blower according to an exemplary embodiment.
Reference numerals:
10. an anti-surge pressure-maintaining controller; 20. a bleed valve; 30. magnetic suspension blower; 40. a pressure maintaining function switch; 50. a temperature sensor; 60. an inlet pressure sensor; 70. an outlet pressure sensor; 80. a speed sensor.
Detailed Description
Reference will now be made in detail to exemplary embodiments, examples of which are illustrated in the accompanying drawings. When the following description refers to the accompanying drawings, the same numbers in different drawings refer to the same or similar elements, unless otherwise indicated. The implementations described in the following exemplary examples are not representative of all implementations consistent with the present disclosure. Rather, they are merely examples of apparatus and methods consistent with some aspects of the present disclosure as detailed in the accompanying claims.
Fig. 1 is a flowchart illustrating an anti-surge dwell control method of a magnetic levitation blower according to an exemplary embodiment, referring to fig. 1, the method includes the following steps S101-S106.
Step S101, acquiring the actual flow of the magnetic suspension blower under the condition that the pressure maintaining function of the magnetic suspension blower is not started or the rotating speed of the magnetic suspension blower is smaller than the set rotating speed.
In the embodiment of the disclosure, when the pressure maintaining function of the magnetic suspension blower is not started or the rotating speed of the magnetic suspension blower is smaller than the set rotating speed, the judging condition of whether the magnetic suspension blower is in surge or not is the flow of the magnetic suspension blower. The set rotational speed is a preset rotational speed lower limit value, and when the rotational speed is smaller than the set rotational speed, surge may occur.
In some embodiments, the magnetic levitation blower is provided with a dwell function switch for selecting whether to turn on the dwell function of the magnetic levitation blower. When the pressure maintaining function switch is not started, the pressure maintaining function of the magnetic suspension blower is not started, and under the condition that the pressure maintaining function is not started, the magnetic suspension blower is in a normal running state.
For the determination of the actual flow, in some embodiments, the inlet pressure and inlet temperature of the maglev blower are obtained, and the actual flow is calculated based on the inlet pressure and inlet temperature. For example, the actual flow is calculated using the following formula:
wherein,for the actual flow +.>For inlet temperature, +.>Is the air moisture content->For inlet pressure +.>For the volume flow in the normal state, +.>Is the intake pressure in the standard state +.>Is the intake air temperature in the standard state.
The standard state refers to an operating state at a temperature of 0℃and a pressure of 101kPa (standard atmospheric pressure).
When the actual flow is calculated, the related parameters such as inlet temperature, inlet air temperature and the like can be detected by arranging a temperature sensor at a position where temperature detection is required; the air moisture content can be detected by a humidity sensor; for the inlet pressure and the intake pressure, detection can be performed by a pressure detection device; for volume flow in the standard condition, detection can be performed by a flow meter.
And step S102, when the actual flow is smaller than the surge fitting flow, controlling the valve of the air release valve of the magnetic suspension blower to be opened.
In the embodiment of the disclosure, whether to control the valve opening of the bleed valve is determined by comparing the actual flow with the surge fitting flow. I.e. determining the surge fitting flowAnd actual flow +.>Flow offset between->When the flow offset is smaller than 0, the actual flow is larger than the surge fitting flow, and pressure release is not needed; when the flow offset is greater than 0, it is indicated that the actual flow is less than the surge fitting flow, and pressure relief is required. The actual flow rate is the currently calculated flow rate, that is, the actual flow rate value obtained by calculation by the above formula. The surge fitting flow is the flow corresponding to the surge critical point that does not induce surge in the current state.
In some embodiments, a surge fitting flow corresponding to an outlet pressure of the magnetic levitation blower at the inlet pressure is determined based on a surge curve that is used to indicate a correspondence between the surge fitting flow and the outlet pressure at a surge critical point that does not induce surge. The surge curve is a curve fitted based on the outlet pressure and flow of the magnetic suspension blower at a plurality of moments, and is a conventional curve.
And step S103, when the actual flow is greater than or equal to the surge fitting flow, controlling the valve of the bleed valve to be closed.
After the valve controlling the air release valve is opened, the air release valve may be used for pressure release. After the pressure relief, it is also necessary to continuously obtain the actual flow and compare the actual flow with the corresponding surge fitting flow, i.e. repeat steps S102 and S103.
Step S104, under the condition that the pressure maintaining function of the magnetic suspension blower is started and the rotating speed of the magnetic suspension blower reaches the set rotating speed, the outlet pressure of the magnetic suspension blower is obtained.
In the embodiment of the disclosure, when the pressure maintaining function of the magnetic suspension blower is started and the rotating speed of the magnetic suspension blower reaches the set rotating speed, the judgment condition of surging of the magnetic suspension blower is the outlet pressure of the magnetic suspension blower. I.e. determining the pressure protection valueAnd outlet pressure +.>Pressure offset between->When the pressure offset is smaller than 0, the outlet pressure is larger than the pressure protection value, and pressure relief is needed; when the pressure offset is greater than 0, it indicates that the outlet pressure is less than the pressure protection value, and no pressure relief is required. Wherein the outlet pressure is the actual detected pressure.
In step S105, when the outlet pressure is greater than the pressure protection value, the valve opening of the purge valve is controlled.
When the outlet pressure is larger than the pressure protection value, the current pressure is larger, and the pressure needs to be released, namely the valve opening of the air release valve is controlled to release the pressure. Wherein the pressure protection value is a preset value.
In some embodiments, since the maximum pressure value that the maglev blower can reach is limited at a certain rotational speed, if the set rotational speed is low and the pressure protection value is high, the pressure protection may not be triggered even if the rotational speed of the maglev blower reaches the preset rotational speed. Therefore, the pressure protection value is smaller than the maximum pressure value which can be reached by the magnetic suspension blower at the set rotating speed, so that the magnetic suspension blower can trigger the pressure protection.
And step S106, when the outlet pressure is less than or equal to the pressure protection value, controlling the valve of the air release valve to be closed.
After the valve controlling the air release valve is opened, the air release valve may be used for pressure release. After the pressure relief, it is also necessary to continuously acquire the outlet pressure and compare the outlet pressure with the pressure protection value, i.e., repeat steps S105 and S106.
Additionally, in some embodiments, the valve opening of the purge valve is controlled when the actual flow is less than the lower flow protection limit, in the event that the hold function has been activated. When the outlet pressure is larger than the pressure protection value, the valve of the air release valve is controlled to be opened, the pressure is gradually reduced, and when the actual flow is smaller than the lower flow protection limit, the valve of the air release valve is still controlled to be opened, so that the actual flow value is improved.
According to the method provided by the embodiment of the disclosure, the actual flow of the magnetic suspension blower can be obtained under the condition that the pressure maintaining function of the magnetic suspension blower is not started or the rotating speed of the magnetic suspension blower is smaller than the set rotating speed; when the actual flow is smaller than the surge fitting flow, controlling a valve of a release valve of the magnetic suspension blower to be opened; when the actual flow is greater than or equal to the surge fitting flow, controlling the valve of the bleed valve to be closed; under the condition that the pressure-keeping function is started and the rotating speed reaches the set rotating speed, the outlet pressure of the magnetic suspension blower is obtained; when the outlet pressure is greater than the pressure protection value, controlling the valve of the air release valve to be opened; and when the outlet pressure is less than or equal to the pressure protection value, controlling the valve of the air release valve to be closed. The flow and the outlet pressure are separately used as the judgment conditions of surging at different rotating speeds, the flow is used as the judgment conditions of surging at a lower rotating speed, the outlet pressure is used as the judgment conditions of surging at a higher rotating speed, and the outlet pressure is kept at a higher value by controlling the opening and closing of the relief valve, so that the magnetic suspension blower can be operated without stopping and maintaining pressure while surging does not occur.
Fig. 2 is a flow chart illustrating another anti-surge dwell control method of a magnetic levitation blower according to an exemplary embodiment, see fig. 2, comprising the following steps S201-206.
Step S201, starting the magnetic levitation blower.
In the initial stage of starting up, the magnetic suspension blower does not give off air, the outlet pressure is high at the moment, the outlet pressure is reduced after the air is given off, and the pressure fluctuates at the moment. After the magnetic suspension blower is started, the surge fitting flow, the pressure protection value, the flow protection lower limit and the set rotating speed which are fitted by the surge curve are input into a control program, so that the magnetic suspension blower can be controlled according to the input parameters.
In some embodiments, the surge curve may be fitted by operating points of the magnetic levitation blower at different speeds or different vane openings, and then according to Bernoulli's equationConverting into a flow value, wherein ∈>For the pressure ratio->Is constant (I)>For pressure->Is a gas constant->For temperature, < >>For the height of the position +.>Is the flow rate. The pressure protection value, the flow protection lower limit and the set rotating speed are determined according to the working rotating speed of the magnetic suspension blower.
It should be noted that, in some embodiments, only when the magnetic levitation blower is started for the first time, the surge fitting flow, the pressure protection value, the flow protection lower limit and the set rotational speed need to be input, and then the input is not repeated when the machine is stopped and restarted, and of course, the input surge fitting flow, the pressure protection value, the flow protection lower limit and the set rotational speed can be modified.
Step S202, when the pressure-keeping function is not started or the rotating speed of the magnetic suspension blower is smaller than the set rotating speed, the magnetic suspension blower operates in a conventional manner, and the surge judgment basis is the calculated actual flow.
Step S203, when the pressure maintaining function is started and the rotating speed of the magnetic suspension blower reaches the set rotating speed, the magnetic suspension blower operates at a high rotating speed, and the surge judgment basis is the outlet pressure.
And step S204, when the magnetic suspension blower reaches a pressure protection value in a high rotating speed range, controlling the valve of the air release valve to be opened for pressure release, and keeping the outlet pressure near the pressure protection value.
In step S205, when the outlet pressure of the magnetic levitation blower is less than the pressure protection value, the valve of the air release valve is controlled to be closed.
The implementation of steps S202-S205 is the same as the implementation of steps S101-S106 described above, and will not be described again here.
Step S206, when the magnetic suspension blower is stopped, the pressure maintaining function of the magnetic suspension blower is automatically closed, and the magnetic suspension blower is decompressed first and then stopped.
When the magnetic suspension blower receives a shutdown instruction, the pressure maintaining function is closed, and the valve of the air release valve is opened to the maximum; and when the outlet pressure of the magnetic suspension blower is reduced to a preset pressure, controlling the magnetic suspension blower to stop. Wherein the preset pressure is a preset smaller pressure value.
According to the method provided by the embodiment of the disclosure, when the pressure maintaining function is not started or the rotating speed of the magnetic suspension blower is lower than the set rotating speed, the magnetic suspension blower is operated in a conventional mode, whether the magnetic suspension blower reaches the surge critical or not is judged according to the flow, and if the actual flow obtained through the inlet pressure and the temperature is smaller than the surge fitting flow, the magnetic suspension blower is considered to surge. When the pressure maintaining function is started and the rotating speed of the magnetic suspension blower is higher than the set rotating speed, the pressure protection is effective, in the rotating speed range, the outlet pressure reaches the set pressure protection value, the air release valve is automatically opened for pressure release, and when the pressure is reduced to be lower than the pressure protection value, the air release valve is closed. The opening of the valve of the air release valve is controlled to ensure that the outlet pressure is stably kept near a set value, so that the magnetic suspension blower is ensured not to surge, and the process stability of the magnetic suspension blower can be maintained.
Fig. 3 is a flowchart of an anti-surge pressure maintaining control process when a flow rate is taken as a judgment condition of surge, and fig. 3 is a flowchart showing still another anti-surge pressure maintaining control method of a magnetic levitation blower according to an exemplary embodiment, referring to fig. 3, the method includes the following steps S301 to S305.
Step S301, when the magnetic suspension blower is started, the surge fitting flow and the set rotating speed are input.
In step S302, when the pressure maintaining function of the magnetic levitation blower is not started or the rotation speed of the magnetic levitation blower is less than the set rotation speed, the actual flow is calculated through the inlet pressure and the inlet temperature.
Step S303, determining whether the actual flow is smaller than the surge fitting flow, executing step S304 when the actual flow is smaller than the surge fitting flow, and executing step S305 when the actual flow is not smaller than the surge fitting flow.
Step S304, the valve of the air release valve is opened to release pressure, the actual flow is obtained again after the pressure release, and step S303 is executed.
Step S305, the valve of the purge valve is closed.
Fig. 4 is a flowchart of an anti-surge pressure maintaining control process when pressure is taken as a judgment condition of surge, and fig. 4 is a flowchart of still another anti-surge pressure maintaining control method of a magnetic levitation blower according to an exemplary embodiment, see fig. 4, which includes the following steps S401 to S405.
In step S401, when the magnetic levitation blower is started, a pressure protection value, a flow protection lower limit and a set rotation speed are input.
Step S402, under the condition that the pressure maintaining function of the magnetic suspension blower is started and the rotating speed of the magnetic suspension blower reaches the set rotating speed, the outlet pressure and the actual flow of the magnetic suspension blower are obtained.
Step S403, determining whether the outlet pressure is greater than the pressure protection value or whether the actual flow is less than the flow protection lower limit, executing step S404 when the outlet pressure is greater than the pressure protection value or the actual flow is less than the flow protection lower limit, and executing step S405 when the outlet pressure is not greater than the pressure protection value or the actual flow is not less than the flow protection lower limit.
Step S404, the valve of the air release valve is opened to release pressure, the actual flow and the outlet pressure are obtained again after the pressure release, and step S403 is executed.
Step S405, the valve of the purge valve is closed.
Fig. 5 is a schematic structural diagram of an anti-surge pressure-maintaining control system of a magnetic levitation blower according to an exemplary embodiment, where the anti-surge pressure-maintaining control system of the magnetic levitation blower is used to execute the anti-surge pressure-maintaining control method of the magnetic levitation blower, and referring to fig. 5, the anti-surge pressure-maintaining control system includes: the anti-surge pressure maintaining controller 10 is configured to send a control instruction to the purge valve 20, where the control instruction is determined according to the actual flow and the surge fitting flow of the magnetic levitation blower 30 when the pressure maintaining function of the magnetic levitation blower 30 is not started or the rotational speed of the magnetic levitation blower 30 is less than the set rotational speed, and the control instruction is determined according to the outlet pressure and the pressure protection value when the pressure maintaining function of the magnetic levitation blower 30 is started and the rotational speed of the magnetic levitation blower 30 reaches the set rotational speed; the bleed valve 20 is positioned at the outlet of the magnetic suspension blower 30 and is used for controlling the opening and closing of the valve of the bleed valve 20 according to the control instruction sent by the anti-surge pressure maintaining controller 10.
In some embodiments, the anti-surge dwell control system further includes: and a pressure maintaining function switch 40 for selecting whether to turn on the pressure maintaining function of the magnetic levitation blower 30.
In some embodiments, the anti-surge dwell control system further includes a temperature sensor 50, an inlet pressure sensor 60, an outlet pressure sensor 70, a speed sensor 80. The temperature sensor 50 is located at an inlet of the magnetic levitation blower 30, and is used for detecting an inlet temperature of the magnetic levitation blower 30 and sending the detected inlet temperature to the anti-surge pressure-maintaining controller 10. The inlet pressure sensor 60 is located at the inlet of the magnetic levitation blower 30, and is used for detecting the inlet pressure of the magnetic levitation blower 30 and sending the detected inlet pressure to the anti-surge pressure-maintaining controller 10. The outlet pressure sensor 70 is located at the outlet of the magnetic levitation blower 30, and is used for detecting the outlet pressure of the magnetic levitation blower 30 and sending the detected outlet pressure to the anti-surge pressure-maintaining controller 10. The speed sensor 80 is located on the rotor of the magnetic levitation blower 30, and is used for detecting the rotation speed of the magnetic levitation blower 30 and sending the rotation speed to the anti-surge pressure-maintaining controller 10. The temperature sensor 50 is located at an inlet of the magnetic levitation blower 30, and is used for detecting the inlet temperature of the magnetic levitation blower 30 and sending the detected inlet temperature to the anti-surge pressure-maintaining controller 10.
The inlet pressure sensor 60 is configured to generate a first pressure signal based on the detected inlet pressure, and send the first pressure signal to the anti-surge pressure-maintaining controller 10, where the anti-surge pressure-maintaining controller 10 is configured to determine the inlet pressure according to the received first pressure signal; the outlet pressure sensor 70 is configured to generate a second pressure signal based on the detected outlet pressure, and send the second pressure signal to the anti-surge pressure-maintaining controller 10, where the anti-surge pressure-maintaining controller 10 is configured to determine the outlet pressure according to the received second pressure signal; the speed sensor 80 is configured to generate a rotational speed signal based on the detected rotational speed and send the rotational speed signal to the anti-surge pressure maintaining controller 10, and the anti-surge pressure maintaining controller 10 is configured to determine the rotational speed according to the received rotational speed signal.
In some embodiments, the anti-surge dwell controller 10 is configured to:
acquiring the actual flow of the magnetic levitation blower 30 under the condition that the pressure maintaining function of the magnetic levitation blower 30 is not started or the rotating speed of the magnetic levitation blower 30 is smaller than the set rotating speed;
when the actual flow is smaller than the surge fitting flow, sending an opening instruction to the bleed valve 20 to control the valve opening of the bleed valve 20;
when the actual flow is greater than or equal to the surge fitting flow, a closing instruction is sent to the bleed valve 20 to control the valve of the bleed valve 20 to be closed;
acquiring the outlet pressure of the magnetic levitation blower 30 under the condition that the pressure maintaining function of the magnetic levitation blower 30 is started and the rotating speed of the magnetic levitation blower 30 reaches the set rotating speed;
when the outlet pressure is greater than the pressure protection value, an opening instruction is sent to the air release valve 20 to control the valve opening of the air release valve 20;
when the outlet pressure is less than or equal to the pressure protection value, a closing instruction is sent to the purge valve 20 to control the valve closing of the purge valve 20.
In some embodiments, the anti-surge dwell controller 10 is configured to send a stop command to the maglev blower 30, the stop command indicating to turn off the dwell function and to open the valve of the purge valve 20 to a maximum, and to control the maglev blower 30 to stop when the outlet pressure of the maglev blower 30 is reduced to a preset pressure.
Other embodiments of the disclosure will be apparent to those skilled in the art from consideration of the specification and practice of the disclosure disclosed herein. This application is intended to cover any adaptations, uses, or adaptations of the disclosure following, in general, the principles of the disclosure and including such departures from the present disclosure as come within known or customary practice within the art to which the disclosure pertains. It is intended that the specification and examples be considered as exemplary only, with a true scope and spirit of the disclosure being indicated by the following claims.
It is to be understood that the present disclosure is not limited to the precise arrangements and instrumentalities shown in the drawings, and that various modifications and changes may be effected without departing from the scope thereof. The scope of the present disclosure is limited only by the appended claims.

Claims (10)

1. The anti-surge pressure maintaining control method of the magnetic suspension blower is characterized by comprising the following steps of:
acquiring the actual flow of the magnetic suspension blower under the condition that the pressure maintaining function of the magnetic suspension blower is not started or the rotating speed of the magnetic suspension blower is smaller than the set rotating speed;
when the actual flow is smaller than the surge fitting flow, controlling a valve of a bleed valve of the magnetic suspension blower to be opened;
when the actual flow is greater than or equal to the surge fitting flow, controlling a valve of the bleed valve to be closed;
acquiring the outlet pressure of the magnetic suspension blower under the condition that the pressure maintaining function of the magnetic suspension blower is started and the rotating speed of the magnetic suspension blower reaches the set rotating speed;
when the outlet pressure is greater than a pressure protection value, controlling the valve of the air release valve to be opened;
and when the outlet pressure is smaller than or equal to the pressure protection value, controlling the valve of the air release valve to be closed.
2. The method for controlling the anti-surge pressure maintaining of the magnetic levitation blower according to claim 1, wherein the obtaining the actual flow of the magnetic levitation blower comprises:
acquiring inlet pressure and inlet temperature of the magnetic suspension blower;
the actual flow is calculated based on the inlet pressure and the inlet temperature.
3. The anti-surge dwell control method of a magnetic levitation blower of claim 2, further comprising:
and determining the surging fitting flow corresponding to the outlet pressure of the magnetic suspension blower at the inlet pressure based on a surging curve, wherein the surging curve is used for indicating the corresponding relation between the surging fitting flow and the outlet pressure at a surging critical point without surging.
4. The anti-surge dwell control method of a magnetic levitation blower according to claim 1, characterized in that the pressure protection value is smaller than a maximum pressure value that the magnetic levitation blower can reach at the set rotational speed.
5. The anti-surge dwell control method of a magnetic levitation blower of claim 1, further comprising:
and under the condition that the pressure maintaining function is started, when the actual flow is smaller than the lower limit of flow protection, controlling the valve of the air release valve to be opened.
6. The anti-surge dwell control method of a magnetic levitation blower of claim 1, further comprising:
when the magnetic suspension blower receives a shutdown instruction, the pressure maintaining function is closed, and the valve of the air release valve is opened to the maximum;
and when the outlet pressure of the magnetic suspension blower is reduced to a preset pressure, controlling the magnetic suspension blower to stop.
7. An anti-surge pressure maintaining control system of a magnetic levitation blower for executing the anti-surge pressure maintaining control method of a magnetic levitation blower according to any one of claims 1 to 6, the anti-surge pressure maintaining control system comprising:
the anti-surge pressure maintaining controller (10) is used for sending a control instruction to the air release valve (20), wherein the control instruction is determined according to the actual flow and the surge fitting flow of the magnetic suspension blower (30) when the pressure maintaining function of the magnetic suspension blower (30) is not started or the rotating speed of the magnetic suspension blower (30) is smaller than the set rotating speed, and the control instruction is determined according to the outlet pressure and the pressure protection value when the pressure maintaining function of the magnetic suspension blower (30) is started and the rotating speed of the magnetic suspension blower (30) reaches the set rotating speed;
and the air release valve (20) is positioned at the outlet of the magnetic suspension blower (30) and is used for controlling the opening and closing of the valve of the air release valve (20) according to the control instruction sent by the anti-surge pressure maintaining controller (10).
8. The anti-surge dwell control system of a magnetic levitation blower of claim 7, further comprising:
and the pressure maintaining function switch (40) is used for selecting whether to start the pressure maintaining function of the magnetic suspension blower (30).
9. The anti-surge dwell control system of a magnetic levitation blower of claim 7, further comprising:
the temperature sensor (50) is positioned at the inlet of the magnetic suspension blower (30) and is used for detecting the inlet temperature of the magnetic suspension blower (30) and sending the inlet temperature to the anti-surge pressure-maintaining controller (10);
an inlet pressure sensor (60) which is positioned at the inlet of the magnetic suspension blower (30) and is used for detecting the inlet pressure of the magnetic suspension blower (30) and sending the inlet pressure to the anti-surge pressure maintaining controller (10);
an outlet pressure sensor (70) which is positioned at the outlet of the magnetic suspension blower (30) and is used for detecting the outlet pressure of the magnetic suspension blower (30) and sending the outlet pressure to the anti-surge pressure-maintaining controller (10);
the speed sensor (80) is positioned on the rotor of the magnetic suspension blower (30) and used for detecting the rotating speed of the magnetic suspension blower (30) and sending the rotating speed to the anti-surge pressure maintaining controller (10).
10. The anti-surge dwell control system of a magnetic levitation blower according to claim 9, characterized in that the anti-surge dwell controller (10) is adapted to:
acquiring the actual flow of the magnetic suspension blower (30) under the condition that the pressure maintaining function of the magnetic suspension blower (30) is not started or the rotating speed of the magnetic suspension blower (30) is smaller than the set rotating speed;
when the actual flow is smaller than the surge fitting flow, sending an opening instruction to the relief valve (20) to control the valve opening of the relief valve (20);
when the actual flow is greater than or equal to the surge fitting flow, sending a closing instruction to the relief valve (20) to control the valve of the relief valve (20) to be closed;
acquiring the outlet pressure of the magnetic suspension blower (30) under the condition that the pressure maintaining function of the magnetic suspension blower (30) is started and the rotating speed of the magnetic suspension blower (30) reaches a set rotating speed;
when the outlet pressure is greater than the pressure protection value, sending an opening instruction to the air release valve (20) so as to control the valve opening of the air release valve (20);
and when the outlet pressure is smaller than or equal to the pressure protection value, sending a closing instruction to the air release valve (20) so as to control the valve of the air release valve (20) to be closed.
CN202311315072.0A 2023-10-12 2023-10-12 Anti-surge pressure-maintaining control method and system for magnetic suspension blower Active CN117108540B (en)

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