WO2018209779A1 - Air valve control method, control device, control system, and fume hood - Google Patents

Abstract

An air valve control method, control device, control system, and fume hood. The air valve is provided on the fume hood, and the fume hood is provided with a movable door. The control method comprises: performing real-time airflow measurement (101): when the air valve continues to have a certain opening angle, measuring a real-time airflow value at a predetermined frequency; reference airflow calculation: measuring an opening area of a movable door (102), and calculating, according to the opening area and a predetermined safety face velocity, a reference airflow required for the air valve to ensure the safe face velocity (103); and airflow difference determination (104): determining whether the real-time airflow value is within a tolerance range of the reference airflow, and if so, maintaining the opening angle of the air valve, or else adjusting the angle of the air value to enable the real-time airflow to fall within the tolerance range. The air valve control method enables safe, highly efficient, energy-saving, and intelligent ventilation regulation.

Description

Damper control method, control device, control system and fume hood Technical field

The invention relates to the field of control regulation systems, in particular to a damper control method, a control device, a control system and a fume hood.

Background technique

The fume hood is an integral part of the laboratory ventilation design. In order to keep laboratory workers from inhaling or swallowing some toxic, pathogenic or toxic chemicals and organisms, there should be good ventilation in the laboratory. To prevent the absorption of some vapors, gases and particulates (smoke, soot, dust and aerosols), the pollutants must be removed by means of a fume hood, hood or partial ventilation. The speed at which the airflow enters the fume hood through the operation surface of the fume hood is called the surface wind speed. The fume hood adjusts the ventilation of the cabinet through the damper. The traditional damper adjusts the ventilation volume manually, and the current damper can also pass the detection. The surface speed of the fume hood adjusts the damper.

For example, the Chinese patent document with the patent number CN201010518717.7 discloses a laboratory variable air volume fume hood control system, which is characterized in that it comprises a fume hood, a venturi valve mounted on the exhaust pipe of the fume hood, a displacement sensor, and a door. High alarm switch, surface wind speed monitoring and control system, fan frequency conversion system, valve controller and valve actuator, surface wind speed monitoring and control system including surface wind speed sensor and variable air volume controller, variable air volume controller for real-time measurement of fume hood opening, At the same time, the surface wind speed sensor measures the surface wind speed in real time and converts it into a voltage signal and transmits it to the variable air volume controller. The variable air volume controller compares the actual value of the surface wind speed with the set value. If the wind speed is not within the set value range, the variable air volume The controller outputs a signal to the valve controller, and the valve controller outputs a signal to the valve actuator. The valve actuator drives the piston of the venturi valve to move up and down, changes the sectional area of the ventilation, and adjusts the ventilation air volume.

The venturi valve includes a valve body, a two-link seat of the device in the valve body, a tapered piston, a connecting rod and a control rod. The valve body cavity is provided with a reduced diameter suitable for the tapered piston, and the tapered piston passes through the piston sleeve. The piston cap and the spring cap are mounted at one end of the connecting rod, and one end of the control rod is hinged to the connecting rod through the guiding rod, and the other end of the control rod is connected with the valve actuator.

The advantages of the above surface wind speed monitoring and control system include: 1) The valve adopts a variable air volume venturi valve, which can independently control the variable air volume of a single fume hood according to design requirements, and effectively discharge toxic gases and particles from pollution sources in a timely manner. Work safely and reliably; 2), the surface wind speed is not affected by the pipeline air pressure, and is not interfered by the inside and outside of the fume hood; 3), when the cabinet When the door moves up and down, it can automatically control the variable air volume valve, so that the surface wind speed is stable at 0.5m/s, the valve reaction speed should be fast response, and the balance time is less than 1 second; the variable air volume control valve is required to measure the surface wind speed, and the control adjustment method should be For closed loop control, the control panel directly displays the surface wind speed. 4) Automatically adjust the exhaust air volume to meet the safety surface wind speed requirements under different conditions. The minimum, maximum exhaust air volume or surface wind speed setting value of the valve can be set through the control panel, and the required minimum exhaust volume can be maintained or Face wind speed; 5) When the unfavorable situation such as low surface wind speed is too low, the sound and light alarm should be automatically issued. The controller should have an emergency button. When a fire or unexpected emergency occurs, press this button and the damper should be pressed. The maximum air volume is running and an alarm is issued.

Through the analysis of the above patent documents, the laboratory variable air volume fume control system uses the surface wind speed sensor to measure the surface wind speed in real time, and converts it into a voltage signal and transmits it to the variable air volume controller. The variable air volume controller is actually based on the surface wind speed. The value is compared with the set value, that is, the opposite wind speed value is detected and compared, thereby adjusting the piston of the venturi valve according to the comparison result, changing the sectional area of the ventilation, and finally achieving the effect of adjusting the ventilation amount. This type of control requires the use of a surface wind speed sensor to directly detect the surface wind speed of the fume hood and compare the actual surface wind speed with the set value. The applicable valve types are limited and are susceptible to ventilation pipe air pressure, indoor air flow and human external factors. The interference is not high.

In the Chinese patent document with the patent number CN201610236923.6, an intelligent control type fume hood is also disclosed, which belongs to the field of experimental equipment, including a wind speed sensor, an air exhaust device, a supplement air device, a control center, a temperature sensor and a pressure sensor. Both the exhaust device and the air supply device are driven by frequency conversion and are connected to the control center. The air speed sensor, temperature sensor and pressure sensor are arranged in the fume hood, and the airflow and air pressure parameters in the fume hood can be monitored at any time, and feedback is timely The control center, which in turn controls the air volume of the wind and the exhaust. The invention can realize closed-loop automatic regulation, high safety factor, energy saving and environmental protection.

In the actual use process, according to different experimental release gas quantities, the temperature, pressure and wind speed parameters are set through the electronic touch screen, and then the wind speed sensor feeds back the wind speed at the air exhaust device to the control center. The control center automatically adjusts the air supply volume of the air supply device through the programmed program. The temperature sensor and the pressure sensor simultaneously feed back the corresponding parameters to the control center to detect whether the test state is normal in real time, and can realize the operation of the door opening by controlling the operation door motor. Size, adjust the amount of air. However, the invention does not specifically describe how the control center automatically adjusts the amount of replenishment of the air supplement device, and further technical improvement is required.

In summary, how to accurately adjust the ventilation volume of the fume hood in real time to achieve a safer, more efficient, energy-saving and intelligent variable air volume control system has become one of the urgent problems to be solved in the field.

Summary of the invention

In order to solve the above problems, an object of the present invention is to provide a damper control method, in which a damper is disposed on a fume hood. The fume hood is equipped with a sliding door, including the following steps: real-time air volume detection, when the damper maintains a certain opening angle, the real-time air volume of the damper is detected at a set frequency; the standard air volume is calculated, and the opening area of the sliding door of the fume hood is detected, according to The opening area and the preset safety surface wind speed, calculate the standard air volume required for the damper to ensure the safety surface wind speed; determine the air volume difference, determine whether the real-time air volume value is within the allowable error value of the standard air volume, and if so, maintain the damper The current opening angle; if not, adjust the opening angle of the damper such that the real-time air volume is ultimately within the allowable error value range.

The damper control method calculates the standard air volume according to the sliding door opening area and the safety surface wind speed, compares the real-time air volume of the damper with the standard air volume, and adjusts the opening angle of the damper according to the comparison result, which can be applied to various dampers and is excluded. The interference of pipeline air pressure, indoor air flow and human external factors can achieve safer, more efficient, energy-saving and intelligent ventilation adjustment.

Preferably, when the damper is an exhaust valve, the standard air volume calculation of the exhaust valve is performed according to the following formula: Q=V·S; wherein Q is the standard air volume of the exhaust valve, and V is the preset safety surface. Wind speed, S is the opening area of the sliding door.

Further, when the damper further includes a supplemental damper, the standard air volume of the supplemental damper is Q ₂ =n Q ₁ , where Q ₂ is the standard air volume of the supplemental damper, and the value range of n is [0.65, 0.7 ].

Further, the damper control method further comprises: opening the height detection, detecting the opening height of the sliding door before the standard air volume calculation; opening the area calculation, further combining the opening height with the total height of the sliding door and the width of the sliding door, Calculate the opening area of the sliding door according to the following formula: S=(Hh)·L; where S is the opening area of the sliding door, H is the total height of the sliding door, h is the opening height of the sliding door, and L is The width of the sliding door.

Before the standard air volume calculation, the opening height of the sliding door is first detected, and the opening area of the sliding door is calculated according to the opening height of the sliding door. In practical applications, only a simple position sensing device can be realized, so that the sliding door opening area is realized. The detection is more convenient and faster.

Preferably, the set frequency is greater than or equal to 40 ms/time. This frequency ensures that the damper can better adjust the ventilation volume, accurately control the surface wind speed in real time, and avoid the energy loss caused by frequent adjustment.

Further, in the air volume difference determining step, when the real-time air volume is not within the allowable error value range of the standard air volume, if the real-time air volume is greater than the highest value of the allowable error value range of the standard air volume, the opening angle of the damper is decreased; If the real-time air volume is less than the lowest value of the allowable error value range of the standard air volume, the opening angle of the damper is increased.

Preferably, the allowable error value of the standard air volume is zero. That is, the real-time air volume value is equal to the standard air volume value, so as to maintain the optimal ventilation and achieve the best adjustment effect.

The invention also discloses a damper control device, the damper is arranged on the fume hood, the fume hood is provided with a sliding door, comprising: a real-time air volume detecting unit, the real-time air volume detecting unit is connected with the damper, and the real-time air volume is obtained from the damper The signal, the real-time air volume is the ventilation amount of the damper detected by the real-time air volume detecting unit at the set frequency when the damper maintains a certain opening angle; The area detecting unit, the opening area detecting unit is connected with the sliding door, and the opening area signal of the sliding door is obtained from the sliding door; the standard air volume calculating unit receives the opening area signal, and according to the opening area signal and the safety surface of the preset fume hood The wind speed is used to output the standard air volume signal. The standard air volume is the ventilation required for the wind valve when the safety surface wind speed is ensured; the air volume difference judgment unit receives the real-time air volume signal and the standard air volume signal, and outputs the damper control signal, wherein the damper control signal is The control actions implemented include:

Maintaining the current opening angle of the damper when the real-time air volume is within the allowable error value of the standard air volume;

When the real-time air volume is not within the allowable error value range of the standard air volume, adjust the current opening angle of the damper so that the real-time air volume is finally within the allowable error value range.

Further, when the damper is an exhaust valve, the standard air volume calculation of the exhaust valve is performed according to the following formula: Q ₁ = V·S; wherein Q ₁ is the standard air volume of the exhaust valve, and V is a preset The safety surface wind speed, S is the opening area of the sliding door.

Preferably, when the damper further comprises a supplemental damper, the standard air volume of the supplemental damper is Q ₂ =n Q ₁ , wherein Q ₂ is the standard air volume of the supplemental damper, and the value of n ranges from [0.65, 0.7] .

Further, the opening area detecting portion includes: an opening height detecting portion connected to the sliding door to detect the opening height of the sliding door; the opening area calculating portion receiving the opening height signal, and further combining the sliding door total height and the sliding door The width of the sliding door is calculated according to the following formula: S = (Hh) · L; where S is the opening area of the sliding door, H is the total height of the sliding door, h is the opening height of the sliding door, and L is the displacement The width of the door.

Preferably, the set frequency is greater than or equal to 40 ms/time.

Further, in the air volume difference determining unit, when it is determined that the real-time air volume is not within the allowable error value range of the standard air volume, the control action performed by the damper control signal specifically includes: if the real-time air volume is greater than the standard air volume, the maximum allowable error value range The value reduces the opening angle of the damper; if the real-time air volume is less than the lowest value of the allowable error value range of the standard air volume, the opening angle of the damper is increased.

Preferably, the allowable error value of the standard air volume is zero.

The invention also provides a damper control device, the damper is arranged on the fume hood, the fume hood is provided with a sliding door, and comprises the following module: a real-time air volume detecting module, configured to detect the set frequency when the damper maintains a certain opening angle The real-time air volume of the damper; the open area detection module is used to detect the opening area of the sliding door of the fume hood; the standard air volume calculation module is used to calculate the damper required to ensure the safety surface wind speed according to the opening area and the preset safety surface wind speed The standard air volume; the air volume difference judgment module is configured to determine whether the real-time air volume value is within the allowable error value range of the standard air volume, and if so, maintain the current opening angle of the damper; if not, adjust the current opening angle of the damper So that the real-time air volume is finally within the allowable error value range.

Preferably, when the damper is an exhaust damper, the standard air volume calculation of the venting valve is performed according to the following formula: Q=V·S; Where Q is the standard air volume of the exhaust valve, V is the preset safety surface wind speed, and S is the opening area of the sliding door.

Further, when the damper further includes a supplemental damper, the standard air volume of the supplemental damper is Q ₂ =n Q ₁ , where Q ₂ is the standard air volume of the supplemental damper, and the value range of n is [0.65, 0.7 ].

Further, the damper control device further includes: an opening height detecting module for detecting the opening height of the sliding door before the standard air volume calculation; and an opening area calculation module for further combining the opening height with the total sliding door height of the sliding door And the width of the sliding door, the opening area of the sliding door is calculated according to the following formula: S=(Hh)·L; wherein S is the opening area of the sliding door, H is the total height of the sliding door, h is the The opening height of the sliding door, L is the width of the sliding door.

Preferably, the set frequency is greater than or equal to 40 ms/time.

Further, in the air volume difference judgment module, when the real-time air volume is not within the allowable error value range of the standard air volume, if the real-time air volume is greater than the highest value of the allowable error value range of the standard air volume, the current opening angle of the damper is decreased; If the real-time air volume is less than the lowest value of the allowable error value range of the standard air volume, the current opening angle of the damper is increased.

Preferably, the allowable error value of the standard air volume is zero.

The invention also discloses a damper control system, the damper is arranged on the fume hood, the fume hood is provided with a sliding door, comprising the damper control device as described above, and the damper control device is respectively connected with the damper and the sliding door.

The present invention also provides a fume hood comprising the damper control system as described above.

Further, the fume hood is further provided with a human-machine interface for inputting control information and displaying status information of the fume hood.

As described above, the damper control method, the damper control device, the damper control system, and the fume hood provided by the present invention can be applied to various dampers, and the interference of the pipeline air pressure, the indoor air flow, and human external factors is eliminated. It can achieve safer, more efficient, energy-saving and intelligent ventilation adjustment. In order to make the above description of the present invention more comprehensible, the preferred embodiments will be described below in detail with reference to the accompanying drawings.

DRAWINGS

Specific embodiments of the present invention will be further described in detail below with reference to the accompanying drawings.

1 is a flow chart showing a method of controlling a damper according to a first embodiment of the present invention;

2 is another flow chart of a method of controlling a damper according to a first embodiment of the present invention;

3a is a schematic diagram showing the module connection of a damper control device according to a second embodiment of the present invention;

3b is a schematic diagram showing the module connection of another damper control device according to a second embodiment of the present invention;

4a is a schematic diagram showing the module connection of a damper control device according to a third embodiment of the present invention;

4b is a schematic diagram showing the module connection of another damper control device according to a third embodiment of the present invention;

Fig. 5 is a schematic view showing the structural connection of various parts of a fume hood according to a seventh embodiment of the present invention.

detailed description

The embodiments of the present invention are described below by way of specific embodiments, and those skilled in the art can readily understand other advantages and functions of the present invention from the disclosure of the present disclosure. Although the description of the present invention will be described in conjunction with the preferred embodiments, this is not a limitation of the invention. Rather, the invention is described in connection with the embodiments so as to cover other alternatives or modifications that are possible in the embodiments of the invention. In order to provide a thorough understanding of the present invention, many specific details are included in the following description. The invention may also be practiced without these details. In addition, some specific details are omitted in the description in order to avoid obscuring or obscuring the present invention.

In the description of the present invention, it should be noted that the terms "installation", "connected", and "connected" should be understood broadly, unless otherwise explicitly defined and limited. For example, "connecting" may be a wired connection, or It is a wireless connection, which may be a fixed connection, a detachable connection, or an integral connection; it may be a mechanical connection or an electrical connection; it may be directly connected, or may be indirectly connected through an intermediate medium, and may be two components. Internal connectivity. The specific meaning of the above terms in the present invention can be understood in a specific case by those skilled in the art.

In addition, the terms "upper", "lower", "left", "right", "top", and "bottom" used in the following description are not to be construed as limiting the invention.

[First Embodiment]

As shown in FIG. 1 , the present invention discloses a damper control method. The damper is disposed on a fume hood, and the fume hood is provided with a sliding door, including the following steps:

Step S10: real-time air volume detection, when the damper maintains a certain opening angle, detecting the real-time air volume of the damper at a set frequency;

Step S20: Turn on the area detection to detect the opening area of the sliding door of the fume hood;

Step S30: calculating the standard air volume, and calculating a standard air volume required for the wind valve when ensuring the wind speed of the safety surface according to the opening area and the preset safety surface wind speed;

Step S40: determining the air volume difference value, determining whether the real-time air volume value is within the allowable error value range of the standard air volume, and if so, maintaining the current opening angle of the damper; if not, adjusting the opening angle of the damper to make the real-time air volume Within the allowable error value range.

In the real-time air volume detection of step S10, an air volume detecting device for detecting the ventilation amount may be disposed in the damper, and the air volume detecting device is connected with the damper, and the real-time air volume of the damper is obtained from the damper, and the air volume detecting device is A wind gauge or an anemometer can usually be used.

Specifically, when the damper is an exhaust vent valve, that is, when the ventilating cabinet is a single exhaust type ventilating cabinet, the calculation of the standard air volume of the venting valve is obtained according to the following formula:

Q=V·S; where Q is the standard air volume, V is the preset safety surface wind speed, and S is the opening area of the sliding door.

Still further, inner wind up type hood, when both the exhaust valve and damper comprises a damper up, up to the standard air volume damper Q ₂ = n Q _1, wherein, Q ₂ is the complement damper The standard air volume, n has a value range of [0.65, 0.7]. Preferably, the value of n is 0.7 when the air volume adjustment effect of the fume hood is optimal, that is, when the standard air volume of the air supply valve reaches the standard air volume of the exhaust valve 70 At the time of %, the entire fume hood is in optimal ventilation.

Further, as shown in FIG. 2, the damper control method of this embodiment further includes:

Step S21: Turn on the height detection to detect the opening height of the sliding door;

Step S22: Open the area calculation, further combine the opening height with the total height of the sliding door and the width of the sliding door, and calculate the opening area of the sliding door according to the following formula: S=(Hh)·L; wherein S is the The opening area of the sliding door, H is the total height of the sliding door, h is the opening height of the sliding door, and L is the width of the sliding door. Specifically, a displacement sensor can be used to detect the position signal of the sliding door, the displacement sensor is connected with the sliding door, and the opening height is obtained from the sliding door, thereby further calculating the opening area of the sliding door, and of course, other methods can be used for detecting the movement. The opening area of the door.

More specifically, in the standard air volume calculation step S30 of the embodiment, the opening area of the sliding door is first calculated according to the total height of the sliding door, the sliding door width and the real-time height of the sliding door, and secondly, according to the opening area of the sliding door and the pre-planning The set wind speed is calculated from the safety surface. It will be appreciated by those skilled in the art that the standard air volume value of the sliding door herein can also be calculated according to other methods having the same principle as the above-described scheme.

Preferably, in the real-time air volume detection in step S10, the real-time air volume of the damper needs to be detected at a preset frequency. Preferably, the set frequency is a fixed frequency, which may be 40 ms/time or more, the frequency. For the detection frequency which is more suitable for the actual measurement, it can meet the requirements of both data acquisition and energy conservation. Similarly, it can be set according to the actual needs of the user.

Further, in the determination of the air volume difference in step S40, it is required to determine whether the real-time air volume value is within the allowable error value range of the standard air volume value, and the error range can be set by the user. Preferably, the allowable error value can be 0. At this time, when the real-time air volume value is higher than the standard air volume value, the opening angle of the damper is reduced; when the real-time air volume value is lower than the standard air volume value, the opening angle of the damper is increased; when the real-time air volume value is equal to the standard air volume When the value is maintained, the current opening angle of the damper is maintained. Those skilled in the art will appreciate that when the allowable error value is set to zero, the effect of the regulation is optimal.

The damper control method in this embodiment compares the real-time ventilation amount of the damper and the standard air volume required by the current fume hood according to the safety surface wind speed, compares the real-time air volume value with the standard air volume value, and feeds back according to the comparison result. Adjusting the opening angle of the damper, it can be applied to a variety of dampers such as Bernoulli variable air volume control valve, venturi valve, butterfly valve, etc. In addition to pipeline air pressure, indoor air flow and human external factors, it can achieve more precise control and has high practical value.

[Second embodiment]

As shown in FIG. 3a, the embodiment discloses a damper control device 100. The damper is disposed on a fume hood, and the fume hood is provided with a sliding door, including:

The real-time air volume detecting unit 101 connects the damper to the damper, and acquires a real-time air volume signal from the damper. The real-time air volume is the wind detected by the real-time air volume detecting unit at the set frequency when the damper maintains a certain opening angle. The amount of ventilation of the valve;

Opening the area detecting unit 102, the opening area detecting unit 102 is connected to the sliding door, and acquiring an opening area signal of the sliding door from the sliding door;

The standard air volume calculation unit 103 receives the open area signal, and outputs a standard air volume signal according to the open area signal and the preset safety surface wind speed of the fume hood, and the standard air volume is the required ventilation amount of the air valve when the safety surface wind speed is ensured;

The air volume difference determining unit 104 receives the real-time air volume signal and the standard air volume signal, and outputs a damper control signal, wherein the control actions performed by the damper control signal include:

Maintaining the current opening angle of the damper when the real-time air volume is within the allowable error value of the standard air volume;

When the real-time air volume is not within the allowable error value range of the standard air volume, adjust the current opening angle of the damper so that the real-time air volume is finally within the allowable error value range.

The real-time air volume detecting unit 101, the opening area detecting unit 102, the standard air volume calculating unit 103, and the air volume difference determining unit 104 are all broad concepts, and may be hardware, such as a sensor, a detector, or the like, or may be software.

Specifically, when the damper is an exhaust vent valve, that is, when the ventilating cabinet is a single exhaust type ventilating cabinet, the calculation of the standard air volume of the venting valve is obtained according to the following formula: Q=V·S; wherein Q is a standard The air volume, V is the preset safety surface wind speed, and S is the opening area of the sliding door.

Furthermore, in the internal air supply type fume hood, when the damper includes both the exhaust valve and the supplemental damper, the standard air volume of the plenum valve is Q ₂ =n Q ₁ , wherein Q ₂ is a supplemental damper The standard air volume, n has a value range of [0.65, 0.7]. Preferably, the value of n is 0.7 when the air volume adjustment effect of the fume hood is optimal, that is, when the standard air volume of the air supply valve reaches the standard air volume of the exhaust valve 70 At the time of %, the entire fume hood is in optimal ventilation.

Further, as shown in FIG. 3b, the damper control device of this embodiment further includes:

Opening the height detecting portion 112, and connecting with the sliding door to detect the opening height of the sliding door;

The opening area calculating unit 122 receives the opening height signal, and further combines the sliding door total height and the sliding door The width of the sliding door is calculated according to the following formula: S = (Hh) · L; where S is the opening area of the sliding door, H is the total height of the sliding door, h is the opening height of the sliding door, and L is the displacement The width of the door. Specifically, a displacement sensor can be used to detect the position signal of the sliding door, the displacement sensor is connected with the sliding door, and the opening height is obtained from the sliding door, thereby further calculating the opening area of the sliding door, and of course, other methods can be used for detecting the movement. The opening area of the door.

More specifically, in the standard air volume calculation unit 103 of the present embodiment, the opening area of the sliding door is first calculated according to the total height of the sliding door, the sliding door width, and the real-time height of the sliding door, and secondly, according to the opening area of the sliding door and the pre-planning The set wind speed is calculated from the safety surface. It will be appreciated by those skilled in the art that the standard air volume value of the sliding door herein can also be calculated according to other methods having the same principle as the above-described scheme.

Preferably, in the real-time air volume detecting unit 101, it is necessary to detect the real-time air volume of the damper at a preset frequency. Preferably, the set frequency is a fixed frequency, which may be 40 ms/time or more, and the frequency is The more suitable detection frequency in the actual measurement can meet the requirements of both data acquisition and energy saving. Similarly, it can be set according to the actual needs of the user.

Further, in the air volume difference determining unit 104, it is required to determine whether the real-time air volume value is within the allowable error value range of the standard air volume value, and the allowable error range can be set by the user. Preferably, the allowable error value range can be 0, when the real-time air volume value is higher than the standard air volume value, reduce the opening angle of the damper; when the real-time air volume value is lower than the standard air volume value, increase the opening angle of the damper; when the real-time air volume value is equal to the standard air volume value At the same time, the current opening angle of the damper is maintained. Those skilled in the art will appreciate that the regulation effect is optimal when the allowable error value range is set to zero.

The damper control device in this embodiment compares the real-time ventilation amount of the damper and the standard air volume required by the current fume hood according to the safety surface wind speed, compares the real-time air volume value with the standard air volume value, and feeds back according to the comparison result. Adjusting the opening angle of the damper can be applied to Bernoulli variable air volume control valve, venturi valve, butterfly valve and other dampers, eliminating the interference of pipeline air pressure, indoor air flow and human external factors, which can achieve more precise The control has high practical value.

[Third embodiment]

As shown in FIG. 4a, a third embodiment of the present invention provides a damper control device 200. The damper is disposed on a fume hood, and the fume hood is provided with a sliding door. The damper control device 200 includes the following modules:

The real-time air volume detecting module 201 is configured to detect the real-time air volume of the damper at a set frequency when the damper maintains a certain opening angle;

The opening area detecting module 202 is configured to detect an opening area of the sliding door of the fume hood;

The standard air volume calculation module 203 is configured to calculate a safety surface wind according to the opening area and the preset safety surface wind speed. The standard air volume required for the speed damper;

The air volume difference determining module 204 is configured to determine whether the real-time air volume value is within the allowable error value range of the standard air volume, and if yes, maintain the current opening angle of the damper; if not, adjust the opening angle of the damper to enable real-time The air volume is ultimately within the allowable error range.

In the real-time air volume detecting module 201, an air volume detecting device for detecting a ventilation amount may be provided in the damper to detect a real-time air volume of the damper, and the air volume detecting device and the damper control device 200 of the present embodiment are real-time. The air volume detecting module 201 is connected, and the numerical signal of the detected ventilation amount is transmitted to the real-time air volume detecting module 201 in real time, and the air volume detecting is usually performed by using a wind gauge or an anemometer.

Specifically, when the damper is an exhaust vent valve, that is, when the ventilating cabinet is a single exhaust type ventilating cabinet, the calculation of the standard air volume of the venting valve is obtained according to the following formula:

Q=V·S; where Q is the standard air volume, V is the preset safety surface wind speed, and S is the opening area of the sliding door.

Furthermore, in the internal air supply type fume hood, when the damper includes both the exhaust valve and the supplemental damper, the standard air volume of the plenum valve is Q ₂ =n Q ₁ , wherein Q ₂ is a supplemental damper The standard air volume, n has a value range of [0.65, 0.7]. Preferably, the value of n is 0.7 when the air volume adjustment effect of the fume hood is optimal, that is, when the standard air volume of the air supply valve reaches the standard air volume of the exhaust valve 70 At the time of %, the entire fume hood is in optimal ventilation.

Further, as shown in FIG. 4b, the damper control device of the embodiment may specifically include: an opening height detecting module 212 for detecting an opening height of the sliding door; and a sliding door area calculating module 222 for further combining the opening height with the sliding door shifting The total height of the door and the width of the sliding door are calculated according to the following formula: S=(Hh)·L; where S is the opening area of the sliding door, H is the total height of the sliding door, and h is the The opening height of the sliding door, L is the width of the sliding door. Specifically, a displacement sensor can be used to detect the position signal of the sliding door, the displacement sensor is connected with the sliding door, and the opening height is obtained from the sliding door, thereby further calculating the opening area of the sliding door, and of course, other methods can be used for detecting the movement. The opening height of the door, thereby calculating the opening area of the sliding door.

More specifically, the standard air volume calculation module 202 first calculates the opening area of the sliding door according to the total height of the sliding door, the width of the sliding door and the real-time height of the sliding door, and secondly, according to the opening area of the sliding door and the preset safety surface wind speed. Standard air volume value. It will be appreciated by those skilled in the art that the standard air volume value of the sliding door herein can also be calculated according to other methods having the same principle as the above-described scheme.

Preferably, in the real-time air volume detecting module 201, the real-time air volume of the damper needs to be detected at a preset frequency. Preferably, the set frequency is a fixed frequency, which may be greater than or equal to 40 ms/time, and the frequency is measured. A more suitable detection frequency can meet both the data acquisition and energy saving requirements. Similarly, it can be set according to the actual needs of the user.

Further, in the air volume difference determining module 204, it is required to determine whether the real-time air volume value is within the allowable error value range of the standard air volume value, and the allowable error value range can be set by the user. Preferably, the allowable error value can be 0. At this time, when the real-time air volume value is higher than the standard air volume value, the opening angle of the damper is reduced; when the real-time air volume value is lower than the standard air volume value, the opening angle of the damper is increased; when the real-time air volume value is equal to the standard air volume When the value is maintained, the current opening angle of the damper is maintained. Those skilled in the art will appreciate that when the allowable error value is set to zero, the effect of the regulation is optimal.

The damper control device in this embodiment compares the real-time ventilation amount of the damper and the standard air volume required by the current fume hood according to the safety surface wind speed, compares the real-time air volume value with the standard air volume value, and feeds back according to the comparison result. Adjusting the opening angle of the damper enables more precise control and has high practical value.

Fourth Embodiment

This embodiment discloses another damper control device. The damper is disposed on a fume hood. The fume hood is provided with a sliding door, and includes a memory and a processor. The memory stores a damper control program executable by a computer, and the processor is connected to the memory. And configured to execute the damper control program:

Real-time air volume detection, when the damper maintains a certain opening angle, the real-time air volume of the damper is detected at a set frequency;

Open area detection to detect the opening area of the sliding door of the fume hood;

The standard air volume calculation calculates the standard air volume required by the damper to ensure the safety surface wind speed according to the opening area and the preset safety surface wind speed;

Judging the air volume difference, determining whether the real-time air volume value is within the allowable error value range of the standard air volume, and if so, maintaining the current opening angle of the damper; if not, adjusting the opening angle of the damper and repeating the real-time air volume detecting step Until the real-time air volume is within the allowable error value range.

Wherein, in the real-time air volume detection, an air volume detecting device for detecting the ventilation amount may be provided in the damper to detect the real-time air volume of the damper, and the air volume detecting device is connected to the damper control device of the embodiment, and the detecting The numerical signal of the amount of ventilation to be sent to the damper control device in real time, usually using a wind gauge or an anemometer for air volume detection.

Specifically, when the damper is an exhaust vent valve, that is, when the ventilating cabinet is a single exhaust type ventilating cabinet, the calculation of the standard air volume of the venting valve is obtained according to the following formula:

Q=V·S; where Q is the standard air volume, V is the preset safety surface wind speed, and S is the opening area of the sliding door.

Still further, inner wind up type hood, when both the exhaust valve and damper comprises a damper up, up to the standard air volume damper Q ₂ = n Q _1, wherein, Q ₂ is the complement damper The standard air volume, n has a value range of [0.65, 0.7]. Preferably, the value of n is 0.7 when the air volume adjustment effect of the fume hood is optimal, that is, when the standard air volume of the air supply valve reaches the standard air volume of the exhaust valve 70 At the time of %, the entire fume hood is in optimal ventilation.

Further, the processor in the damper control device of the embodiment is configured to execute the damper control program, further comprising: opening the height detection, detecting the opening height of the sliding door; calculating the opening area, further combining the opening height with the shifting of the sliding door The total height of the door and the width of the sliding door are calculated according to the following formula: S=(Hh)·L; where S is the opening area of the sliding door, H is the total height of the sliding door, and h is the The opening height of the sliding door, L is the width of the sliding door. Specifically, a displacement sensor can be used to detect the position signal of the sliding door, the displacement sensor is connected with the sliding door, and the opening height is obtained from the sliding door, thereby further calculating the opening area of the sliding door, and of course, other methods can be used for detecting the movement. The opening area of the door.

More specifically, in the standard air volume calculation of the embodiment, the door opening sectional area of the sliding door is first calculated according to the total height of the sliding door, the sliding door width and the real-time height of the sliding door, and secondly, according to the opening sectional area of the sliding door and the preset. The safety surface wind speed is calculated to obtain the standard air volume value. It will be appreciated by those skilled in the art that the standard air volume value of the sliding door herein can also be calculated according to other methods having the same principle as the above-described scheme.

Preferably, in the real-time air volume detection, the real-time air volume of the damper needs to be detected at a preset frequency. Preferably, the set frequency is a fixed frequency, which may be 40 ms/time or more, and the frequency is suitable for actual measurement. The detection frequency can meet the requirements of both data acquisition and energy saving. Similarly, it can be set according to the actual needs of the user.

Further, in the determination of the air volume difference, it is required to determine whether the real-time air volume value is within the allowable error value range of the standard air volume value, and the error range can be set by the user. Preferably, the allowable error value can be 0, that is, when When the real-time air volume value is higher than the standard air volume value, the opening angle of the damper is reduced; when the real-time air volume value is lower than the standard air volume value, the opening angle of the damper is increased; when the real-time air volume value is equal to the standard air volume value, the maintenance is maintained. The current opening angle of the damper is unchanged. Those skilled in the art will appreciate that when the allowable error value is set to zero, the effect of the regulation is optimal.

The damper control device in this embodiment compares the real-time ventilation amount of the damper and the standard air volume required by the current fume hood according to the safety surface wind speed, compares the real-time air volume value with the standard air volume value, and feeds back according to the comparison result. Adjusting the opening angle of the damper enables more precise control and has high practical value.

[Fifth Embodiment]

A fifth embodiment of the present invention discloses a non-volatile storage medium on which a damper control program is stored, and a damper control program is executed by a computer to implement a damper control method, including:

Command 1, real-time air volume detection, when the damper maintains a certain opening angle, the real-time air volume of the damper is detected at a set frequency;

Command 2, open area detection, and detect the opening area of the sliding door of the fume hood;

Command 3, standard air volume calculation, according to the opening area and the preset safety surface wind speed, calculate the standard air volume required by the damper to ensure the safety surface wind speed;

Command 4, determine the air volume difference, determine whether the real-time air volume value is within the allowable error value range of the standard air volume, and if so, maintain the current opening angle of the damper; if not, adjust the opening angle of the damper and repeat the real-time The air volume detection step until the real-time air volume is within the allowable error value range.

Wherein, in the command 1, an air volume detecting device for detecting a ventilation amount may be provided in the damper to detect a real-time air volume of the damper, and the air volume detecting device is connected to the damper control device of the embodiment, and will detect The numerical signal of the ventilation quantity is transmitted to the damper control device in real time, and the air volume meter or the anemometer is usually used for the air volume detection.

Specifically, when the damper is an exhaust vent valve, that is, when the ventilating cabinet is a single exhaust type ventilating cabinet, the calculation of the standard air volume of the venting valve is obtained according to the following formula:

Q=V·S; where Q is the standard air volume, V is the preset safety surface wind speed, and S is the opening area of the sliding door.

Furthermore, in the internal air supply type fume hood, when the damper includes both the exhaust valve and the supplemental damper, the standard air volume of the plenum valve is Q ₂ =n Q ₁ , wherein Q ₂ is a supplemental damper The standard air volume, n has a value range of [0.65, 0.7], and preferably, the value of n is 0.7, and the air volume adjustment effect of the fume hood is optimal.

Further, the damper control program in the non-volatile storage medium of the embodiment is executed by a computer to implement a damper control method, and the specific execution of the instruction 2 includes: an instruction 5, opening height detection, detecting an opening height of the sliding door; 6. Open area calculation, the opening height is further combined with the total height of the sliding door and the width of the sliding door, and the opening area of the sliding door is calculated according to the following formula: S=(Hh)·L; wherein S is the moving The opening area of the door, H is the total height of the sliding door, h is the opening height of the sliding door, and L is the width of the sliding door. Specifically, a displacement sensor can be used to detect the position signal of the sliding door, the displacement sensor is connected with the sliding door, and the opening height is obtained from the sliding door, thereby further calculating the opening area of the sliding door, and of course, other methods can be used for detecting the movement. The opening area of the door.

More specifically, in the instruction 3 of the embodiment, the opening area of the sliding door is first calculated according to the total height of the sliding door, the width of the sliding door and the real-time height of the sliding door, and secondly according to the opening area of the sliding door and the preset safety surface. The wind speed is calculated to obtain the standard air volume value. It will be appreciated by those skilled in the art that the standard air volume value of the sliding door herein can also be calculated according to other methods having the same principle as the above-described scheme.

Preferably, in the command 1, the real-time air volume of the damper needs to be detected at a preset frequency. Preferably, the set frequency is a fixed frequency, which may be 40 ms/time or more, and the frequency is suitable for actual measurement. The detection frequency can meet the requirements of both data acquisition and energy saving. Similarly, it can be set according to the actual needs of the user.

Further, in the instruction 4, it is required to determine whether the real-time air volume value is within the allowable error value range of the standard air volume value, and the error range can be set by the user. Preferably, the allowable error value range can be 0, that is, when real-time Air volume When the value is higher than the standard air volume value, the opening angle of the damper is reduced; when the real-time air volume value is lower than the standard air volume value, the opening angle of the damper is increased; when the real-time air volume value is equal to the standard air volume value, the damper is maintained. The current opening angle is unchanged. Those skilled in the art will appreciate that when the allowable error value is set to zero, the effect of the regulation is optimal.

The non-volatile storage medium in the embodiment compares the real-time air volume value with the standard air volume value by detecting the real-time ventilation amount of the damper and obtaining the standard air volume required by the current fume hood according to the safety surface wind speed, according to the comparison result. Feedback to adjust the opening angle of the damper, which enables more precise control and high practical value.

[Sixth embodiment]

A sixth embodiment of the present invention discloses a damper control system including a damper and a sliding door of a fume hood, and a damper control device, wherein the damper control device is respectively connected with a damper and a sliding door, wherein the damper The control unit includes the following modules:

The real-time air volume detecting module is configured to detect the real-time air volume of the damper at a set frequency when the damper maintains a certain opening angle;

Opening an area detecting module for detecting an opening area of the sliding door of the fume hood;

The standard air volume calculation module is configured to calculate a standard air volume required for the wind valve when the safety surface wind speed is ensured according to the opening area and the preset safety surface wind speed;

The air volume difference determining module is configured to determine whether the real-time air volume value is within the allowable error value range of the standard air volume, and if so, maintain the current opening angle of the damper; if not, adjust the opening angle of the damper and repeat the real-time The air volume detection step until the real-time air volume is within the allowable error value range.

Wherein, in the real-time air volume detecting module, an air volume detecting device for detecting a ventilation amount may be provided in the damper to detect a real-time air volume of the damper, and the air volume detecting device and the air volume detecting module in the damper control device of the embodiment Connected and transmitted the detected numerical value of the ventilation quantity to the air volume detection module in real time, usually using a wind gauge or an anemometer for air volume detection.

Specifically, when the damper is an exhaust vent valve, that is, when the ventilating cabinet is a single exhaust type ventilating cabinet, the calculation of the standard air volume of the venting valve is obtained according to the following formula:

Q=V·S; where Q is the standard air volume, V is the preset safety surface wind speed, and S is the opening area of the sliding door.

Furthermore, in the internal air supply type fume hood, when the damper includes both the exhaust valve and the supplemental damper, the standard air volume of the plenum valve is Q ₂ =n Q ₁ , wherein Q ₂ is a supplemental damper The standard air volume, n has a value range of [0.65, 0.7], and preferably, the value of n is 0.7, and the air volume adjustment effect of the fume hood is optimal.

Further, the damper control system of the embodiment further includes an opening height detecting module for detecting the opening height of the sliding door; the opening area calculation module further combining the opening height with the total height of the sliding door and the width of the sliding door, According to The following formula calculates the opening area of the sliding door: S=(Hh)·L; where S is the opening area of the sliding door, H is the total height of the sliding door, h is the opening height of the sliding door, and L is the shifting The width of the door. Specifically, a displacement sensor can be used to detect the position signal of the sliding door, the displacement sensor is connected with the sliding door, and the opening height is obtained from the sliding door, thereby further calculating the opening area of the sliding door, and of course, other methods can be used for detecting the movement. The opening area of the door.

More specifically, the standard air volume calculation module first calculates the opening area of the sliding door according to the total height of the sliding door, the width of the sliding door and the real-time height of the sliding door, and secondly calculates the standard according to the opening area of the sliding door and the preset safety surface wind speed. Air volume value. It will be appreciated by those skilled in the art that the standard air volume value of the sliding door herein can also be calculated according to other methods having the same principle as the above-described scheme.

Preferably, in the real-time air volume detecting module, the real-time air volume of the damper needs to be detected at a preset frequency. Preferably, the set frequency is a fixed frequency, which may be greater than or equal to 40 ms/time, and the frequency is actually measured. Appropriate detection frequency can meet both data acquisition and energy saving requirements. Similarly, it can be set according to the actual needs of the user.

Further, in the air volume difference determining module, it is required to determine whether the real-time air volume value is within the allowable error value range of the standard air volume value, and the error range can be set by the user. Preferably, the allowable error value range can be 0. That is, when the real-time air volume value is higher than the standard air volume value, the opening angle of the damper is decreased; when the real-time air volume value is lower than the standard air volume value, the opening angle of the damper is increased; when the real-time air volume value is equal to the standard air volume value, Then keep the current opening angle of the damper unchanged. Those skilled in the art will appreciate that when the allowable error value is set to zero, the effect of the regulation is optimal.

The damper control system in this embodiment compares the real-time ventilation amount of the damper and the standard air volume required by the current fume hood according to the safety surface wind speed, compares the real-time air volume value with the standard air volume value, and feeds back according to the comparison result. Adjusting the opening angle of the damper enables more precise control and has high practical value.

[Seventh embodiment]

As shown in FIG. 5, a seventh embodiment of the present invention discloses a fume hood 300 including a damper control system including a damper 301, a sliding door 302 and a damper control device 303, and a damper of the fume hood. 301 is used to adjust the ventilation of the fume hood 300, and the damper control device 303 is connected to the damper 301 and the sliding door 302, respectively, wherein the damper control device 303 comprises the following modules:

The real-time air volume detecting module is configured to detect the real-time air volume of the damper at a set frequency when the damper maintains a certain opening angle;

Opening an area detecting module for detecting an opening area of the sliding door of the fume hood;

Standard air volume calculation module for calculating the wind speed of the safety surface according to the opening area and the preset safety surface wind speed The standard air volume required by the damper;

The air volume difference determining module is configured to determine whether the real-time air volume value is within the allowable error value range of the standard air volume, and if so, maintain the current opening angle of the damper; if not, adjust the opening angle of the damper and repeat the real-time The air volume detection step until the real-time air volume is within the allowable error value range.

In the real-time air volume detecting module, an air volume detecting device for detecting the ventilation amount may be provided in the damper 301 to detect the real-time air volume of the damper, and the real-time air volume of the air volume detecting device and the damper control device 303 of the present embodiment The air volume detecting module is connected, and the numerical signal of the detected ventilation amount is transmitted to the air volume detecting module in real time, and the air volume measuring device or the anemometer is usually used for air volume detecting.

Specifically, when the damper is an exhaust vent valve, that is, when the ventilating cabinet is a single exhaust type ventilating cabinet, the calculation of the standard air volume of the venting valve is obtained according to the following formula:

Q=V·S; where Q is the standard air volume, V is the preset safety surface wind speed, and S is the opening area of the sliding door.

Furthermore, in the internal air supply type fume hood, when the damper includes both the exhaust valve and the supplemental damper, the standard air volume of the plenum valve is Q ₂ =n Q ₁ , wherein Q ₂ is a supplemental damper The standard air volume, n has a value range of [0.65, 0.7], and preferably, the value of n is 0.7, and the air volume adjustment effect of the fume hood is optimal.

Further, the damper control system of the fume hood 300 of the embodiment further includes: an opening height detecting module for detecting the opening height of the sliding door; an opening area calculation module, further combining the opening height with the total height and movement of the sliding door The width of the door is calculated according to the following formula: S = (Hh) · L; where S is the opening area of the sliding door, H is the total height of the sliding door, and h is the opening of the sliding door Height, L is the width of the sliding door. Specifically, the displacement sensor 304 can be used to detect the position signal of the sliding door, the displacement sensor is connected with the sliding door, and the opening height is obtained from the sliding door, thereby further calculating the opening area of the sliding door, and of course, other methods can be used for detecting The opening area of the sliding door.

More specifically, the standard air volume calculation module first calculates the opening area of the sliding door according to the total height of the sliding door, the width of the sliding door and the real-time height of the sliding door, and secondly calculates the standard according to the opening area of the sliding door and the preset safety surface wind speed. Air volume value. It will be appreciated by those skilled in the art that the standard air volume value of the sliding door herein can also be calculated according to other methods having the same principle as the above-described scheme.

Preferably, in the real-time air volume detecting module, the real-time air volume of the damper needs to be detected at a preset frequency. Preferably, the set frequency is a fixed frequency, which may be greater than or equal to 40 ms/time, and the frequency is actually measured. Appropriate detection frequency can meet both data acquisition and energy saving requirements. Similarly, it can be set according to the actual needs of the user.

Further, in the air volume difference judgment module, it is necessary to determine whether the real-time air volume value is in the standard air volume value Within the range of the error value, the error range can be set by the user. Preferably, the allowable error value range can be 0, that is, when the real-time air volume value is higher than the standard air volume value, the opening angle of the damper is reduced; When the air volume value is lower than the standard air volume value, the opening angle of the damper is increased; when the real-time air volume value is equal to the standard air volume value, the current opening angle of the damper is maintained. Those skilled in the art will appreciate that when the allowable error value is set to zero, the effect of the regulation is optimal.

The temperature ventilation sensor, the humidity detection module, and the sound and light alarm device may be disposed in the ventilation duct of the fume hood 300 of the embodiment. The temperature sensor and the humidity sensor are used to detect the temperature information and the humidity information of the fume hood at a set frequency, and the temperature is The information is sent to the damper control device 303, and the damper control device 303 compares the temperature information and the humidity information with a preset temperature range and a humidity range, respectively, when the temperature information and the humidity information exceed a preset temperature range and a humidity range. , the sound and light alarm device is used for sound and light alarm. Specifically, an audible and visual alarm can be used to alert the user to adjust the temperature and humidity to meet predetermined requirements. Preferably, the set frequency is also a fixed frequency, and may be 40 ms/time or more. The fume hood of the present embodiment simultaneously regulates the temperature and humidity in the ventilation duct while adjusting the air volume, and meets the requirements of multi-functional regulation while achieving the purpose of energy saving, and can be applied to a wider range of applications.

Preferably, the fume hood 300 is further provided with a man-machine interface 305 for inputting control information such as a preset frequency, a preset temperature range and a humidity range, and displaying status information such as real-time air volume value, temperature information, and humidity information, which is convenient for a person. Machine interaction.

In summary, the present invention provides a damper control method, a control device, a control system, a non-volatile storage medium, and a fume hood, which are required to obtain the current fume hood by detecting the real-time ventilation of the damper and the wind speed according to the safety surface. The standard air volume compares the real-time air volume value with the standard air volume value, and adjusts the opening angle of the damper according to the feedback of the comparison result. It can be applied to various dampers, and excludes the pipeline air pressure, indoor air flow and human external factors. Interference can achieve safer, more efficient, energy-saving, intelligent ventilation adjustment, and has high practical value. The above-described embodiments are merely illustrative of the principles of the invention and its effects, and are not intended to limit the invention. Modifications or variations of the above-described embodiments may be made by those skilled in the art without departing from the spirit and scope of the invention. Therefore, all equivalent modifications or changes made by those skilled in the art without departing from the spirit and scope of the invention will be covered by the appended claims.

Claims (24)

1. A damper control method is provided on a fume hood, the fume hood is provided with a sliding door, characterized in that it comprises the following steps:

   Real-time air volume detection, when the damper maintains a certain opening angle, detecting a real-time air volume of the damper at a set frequency;

   Opening an area detection to detect an opening area of the sliding door;

   Calculating a standard air volume according to the opening area and a preset safety surface wind speed of the fume hood, wherein the standard air volume is a ventilation amount required by the damper when the safety surface wind speed is ensured;

   Judging the air volume difference, determining whether the real-time air volume is within an allowable error value range of the standard air volume, and if so, maintaining a current opening angle of the damper; if not, adjusting an opening angle of the damper, So that the real-time air volume is finally within the allowable error value range.
2. The damper control method according to claim 1, wherein when the damper is an exhaust damper, the standard air volume calculation of the venting valve is performed according to the following formula:

   Q ₁ =V·S;

   Wherein Q ₁ is the standard air volume of the exhaust valve, V is a preset safety surface wind speed, and S is an opening area of the sliding door.
3. The damper control method according to claim 2, wherein when the damper further comprises a supplemental damper, the standard air volume of the plenum valve is Q ₂ = n Q ₁ , wherein Q ₂ is The standard air volume of the air supply valve, the value range of n is [0.65, 0.7].
4. The damper control method according to any one of claims 1 to 3, wherein the opening area detecting step specifically comprises:

   Turning on height detection to detect the opening height of the sliding door;

   Opening area calculation, further combining the opening height with the total height of the sliding door of the sliding door and the width of the sliding door, and calculating the opening area of the sliding door according to the following formula:

   S=(H-h)·L;

   Where S is the opening area of the sliding door, H is the total height of the sliding door, h is the opening height of the sliding door, and L is the width of the sliding door.
5. The damper control method according to claim 1, wherein said set frequency is greater than or equal to 40 ms/time.
6. The damper control method according to claim 1, wherein in the air volume difference determining step, when the real-time ventilation amount is not within an allowable error value range of the standard air volume,

   If the real-time ventilation amount is greater than a highest value of the allowable error value range of the standard air volume, reducing an opening angle of the damper;

   If the real-time ventilation amount is less than the lowest value of the allowable error value range of the standard air volume, the opening angle of the damper is increased.
7. The damper control method according to claim 1 or 6, wherein the allowable error value of the standard air volume is zero.
8. A damper control device is disposed on a fume hood, the fume hood is provided with a sliding door, and is characterized by comprising the following modules:

   a real-time air volume detecting module, configured to detect a real-time air volume of the damper at a set frequency when the damper maintains a certain opening angle;

   Opening an area detecting module for detecting an opening area of the sliding door;

   a standard air volume calculation module, configured to calculate a standard air volume according to the opening area and a preset safety surface wind speed of the fume hood, wherein the standard air volume is a required ventilation amount when the safety surface wind speed is ensured;

   The air volume difference determining module is configured to determine whether the real-time air volume is within an allowable error value range of the standard air volume, and if yes, maintain a current opening angle of the damper; if not, adjust the damper The angle is turned on such that the real-time air volume is ultimately within the allowable error value range.
9. The damper control device according to claim 8, wherein when the damper is an exhaust damper, the standard air volume calculation of the venting valve is performed according to the following formula:

   Q ₁ =V·S;

   Wherein Q ₁ is the standard air volume of the exhaust valve, V is a preset safety surface wind speed, and S is an opening area of the sliding door.
10. Damper control device according to claim 9, wherein, when said damper further comprises a damper complement, the complement standard air volume damper is Q ₂ = n Q _1, wherein, Q ₂ is the The standard air volume of the air supply valve, the value range of n is [0.65, 0.7].
11. The damper control device according to any one of claims 8 to 10, wherein the opening area detecting module specifically comprises:

    Opening a height detecting module for detecting an opening height of the sliding door;

    And an opening area calculation module, configured to further combine the opening height with the total height of the sliding door of the sliding door and the width of the sliding door, and calculate an opening area of the sliding door according to the following formula:

    S=(H-h)·L;

    Where S is the opening area of the sliding door, H is the total height of the sliding door, h is the opening height of the sliding door, and L is the width of the sliding door.
12. The damper control device according to claim 8, wherein said set frequency is greater than or equal to 40 ms/time.
13. The damper control device according to claim 8, wherein in the air volume difference determining module, when the real-time ventilation amount is not within an allowable error value range of the standard air volume, if the real-time ventilation amount Increasing a maximum value of the allowable error value range of the standard air volume, reducing an opening angle of the damper; if the real-time ventilation amount is less than a lowest value of an allowable error value range of the standard air volume, increasing the The opening angle of the damper.
14. The damper control device according to claim 8 or 13, wherein the allowable error value of said standard air volume is zero.
15. A damper control device, the damper is disposed on a fume hood, and the ventilating cabinet is provided with a sliding door, and the ventilating valve is characterized by comprising:

    a real-time air volume detecting unit, wherein the real-time air volume detecting unit is connected to the damper, and acquires a real-time air volume signal from the damper, wherein the real-time air volume is the real-time air volume when the damper maintains a certain opening angle a ventilation amount of the damper detected by the detecting portion at a set frequency;

    Opening an area detecting unit, wherein the opening area detecting unit is connected to the sliding door, and acquiring an opening area signal of the sliding door from the sliding door;

    The standard air volume calculation unit receives the open area signal, and outputs a standard air volume signal according to the open area signal and a preset safety surface wind speed of the fume hood, where the standard air volume is to ensure the wind speed of the safety surface Describe the amount of ventilation required for the damper;

    The air volume difference determining unit receives the real-time air volume signal and the standard air volume signal, and outputs a damper control signal, wherein the control action performed by the damper control signal includes:

    Maintaining a current opening angle of the damper when the real-time air volume is within an allowable error value of the standard air volume;

    When the real-time air volume is not within the allowable error value range of the standard air volume, the current opening angle of the damper is adjusted such that the real-time air volume is finally within the allowable error value range.
16. The damper control device according to claim 15, wherein when said damper is an exhaust damper, said standard air volume calculation of said venting valve is performed according to the following formula:

    Q ₁ =V·S;

    Wherein Q ₁ is the standard air volume of the exhaust valve, V is a preset safety surface wind speed, and S is an opening area of the sliding door.
17. The damper control device according to claim 16, wherein when the damper further comprises a supplemental damper, the standard air volume of the plenum valve is Q ₂ = n Q ₁ , wherein Q ₂ is The standard air volume of the air supply valve, the value range of n is [0.65, 0.7].
18. The damper control device according to any one of claims 15-17, wherein the opening area detecting portion further comprises:

    Opening a height detecting portion connected to the sliding door to detect an opening height of the sliding door;

    The opening area calculating unit receives the opening height signal, and further combines the total height of the sliding door of the sliding door and the width of the sliding door to calculate an opening area of the sliding door according to the following formula:

    S=(H-h)·L;

    Where S is the opening area of the sliding door, H is the total height of the sliding door, h is the opening height of the sliding door, and L is the width of the sliding door.
19. The damper control device according to claim 15, wherein said set frequency is greater than or equal to 40 ms/time.
20. The damper control device according to claim 15, wherein in the air volume difference determining portion, when it is determined that the real-time air volume is not within an allowable error value range of the standard air volume, the damper control signal The control actions implemented include:

    If the real-time air volume is greater than a highest value of the allowable error value range of the standard air volume, reducing an opening angle of the damper;

    If the real-time air volume is less than the lowest value of the allowable error value range of the standard air volume, the opening angle of the damper is increased.
21. The damper control device according to claim 15 or 20, wherein the allowable error value of the standard air volume is zero.
22. A damper control system is provided on a fume hood, the fume hood being provided with a sliding door, characterized by comprising the damper control device according to any one of claims 8-21.
23. A fume hood having a damper and a sliding door thereon, comprising the damper control system of claim 22.
24. A fume hood according to claim 23, wherein said fume hood is further provided with a human machine interface for inputting control information and displaying status information of said fume hood.

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