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Constant flow control method and system

A control method and constant flow technology, applied in the direction of flow control, control/regulation system, flow control using electrical devices, etc., can solve the problems of small change range of centrifugal fan outlet pressure, unable to meet the requirements of use, etc., to avoid surge or The effect of overloading

Active Publication Date: 2021-09-03
精效悬浮(苏州)科技有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] The present invention provides a constant flow control method and system, which can avoid the phenomenon of surge or load overrun of the centrifugal fan, and is used to solve the problem that in the prior art, the constant speed adjustment method is used to adjust the air volume, and the outlet pressure of the centrifugal fan has a small variation range. The technical problem of being unable to meet the use requirements under the condition of large system back pressure changes

Method used

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Examples

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Embodiment 1

[0035] The present invention provides a constant flow control method, which can be used for air suspension centrifugal blowers, such as figure 1 As shown, the method includes:

[0036] In step S11, the real-time pressure value at the inlet of the centrifugal fan, the real-time temperature at the inlet of the centrifugal fan, the standard temperature and the absolute pressure value inside the casing of the centrifugal fan are acquired.

[0037] Specifically, in this solution, the real-time pressure value at the inlet of the centrifugal fan, the real-time temperature at the inlet of the centrifugal fan, and the absolute pressure value inside the casing of the centrifugal fan can be obtained by the sensor, and then the sensor can obtain the real-time pressure value at the inlet of the centrifugal fan, the inlet of the centrifugal fan The real-time temperature and the absolute pressure value in the centrifugal fan chassis are fed back to the PID adjustment controller. It should be...

Embodiment 2

[0111] Optionally, the present invention also provides a constant flow control method, such as figure 2 As shown, the method includes:

[0112] Step S21, receiving a preset air volume value;

[0113] Specifically, in this solution, the PID adjustment controller obtains the preset air volume value according to the uploaded PID adjustment program. It should be noted that the preset air volume value can be set in real time in the PID adjustment program or can be set in the PID adjustment The program is pre-compiled into the PID regulation program before uploading to the PID regulation controller.

[0114] Step S23, controlling the rotational speed of the centrifugal fan according to the preset air volume value.

[0115] The preset air volume value is the air volume value at the outlet of the centrifugal fan set by the user. The purpose is to make the air suspension centrifugal blower centrifugal fan output at a constant air volume to avoid surge and load overrun.

[0116] Spe...

Embodiment 3

[0126] Optionally, the present invention also provides a constant flow control system, using the above-mentioned constant flow control method, such as image 3 shown, including:

[0127] Centrifugal fan 31;

[0128] Sensor 32 for collecting information such as pressure and temperature;

[0129] The PID regulation controller 33 is used to receive the information sent by the sensor 32, calculate and generate and send the control instruction;

[0130] The frequency converter 34 receives the control command sent by the PID regulation controller 33 to control the rotational speed of the centrifugal fan 31 .

[0131] Compared with the existing technology, the PID adjustment controller receives the information such as the pressure and temperature of the centrifugal fan fed back by the sensor, calculates and generates control instructions, controls the speed of the centrifugal fan, and stabilizes the output air volume of the centrifugal fan at a constant value , which effectively a...

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Abstract

The invention relates to the field of centrifugal fan control, in particular to a constant flow control method and system. The method comprises the steps: acquiring the real-time pressure value of an outlet of a centrifugal fan, wherein the change of the real-time pressure value of the outlet of the centrifugal fan reflects the change of back pressure; and controlling the flow of the centrifugal fan according to the backpressure change. According to the constant-flow control method and system, the air suspension centrifugal blower can provide constant-flow output, the surge or load overrun phenomenon of the centrifugal blower is effectively avoided, and the problems that in the prior art, when a constant-rotating-speed adjusting method is used for adjusting the air volume, the change range of the outlet pressure of the centrifugal blower is small, and the use requirement under the working condition of large system back pressure change cannot be met are solved.

Description

technical field [0001] The invention relates to the field of centrifugal fan control, in particular to a constant flow control method and system. Background technique [0002] The air-suspension centrifugal blower adopts the two core technologies of "high-speed direct-coupled motor" and "air-suspension bearing". It is a green environmental protection equipment without cooling system and oil-free lubrication system. and other advantages, it has been widely used in many fields in recent years to replace the Roots blower with low efficiency and high noise. However, due to the characteristics of the air suspension centrifugal blower, it has a surge boundary and a blockage boundary, and cannot provide a constant flow output. It is prone to surge or load overrun, which leads to many problems in the current situation where the Roots blower is completely replaced with an air suspension centrifugal blower. [0003] On the other hand, in some fields, such as material transportation, ...

Claims

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Application Information

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IPC IPC(8): G05D7/06
CPCG05D7/0635Y02B30/70
Inventor 李记东陈军
Owner 精效悬浮(苏州)科技有限公司
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