Flow velocity control equipment and smoke detection system

Abstract

The utility model relates to a flow velocity control device and a smoke detection system, the flow velocity control device comprises a first controller, a frequency conversion fan and a smoke flow velocity collector, and the smoke flow velocity collector is arranged on a device to be detected. A first controller, a frequency conversion fan and a smoke flow speed collector are arranged on flow speed control equipment, and an air outlet of the frequency conversion fan is connected with an auxiliary air inlet of a smoke detection system; the current flow velocity of the smoke in the to-be-detected equipment collected by the smoke flow velocity collector and the target flow velocity of the smoke in the smoke detection system are obtained through the first controller, and the rotating speed of the frequency conversion fan is controlled according to the current flow velocity and the target flow velocity, so that the target flow velocity of the smoke in the smoke detection system can be effectively adjusted; the flow velocity difference value between the target flow velocity and the current flow velocity of the smoke in the to-be-detected equipment is kept within a certain range, errors in the smoke detection process are reduced, the accuracy of the detection result of the smoke detection system is improved, and the power generation efficiency of a power plant is improved.

Description

Technical Field

[0001] The present disclosure relates to the technical field of flow rate control, and in particular, to a flow rate control device and a smoke detection system. Background Art

[0002] Generally speaking, smoke detection systems in electric fields can be divided into through-type and extraction type. Among them, the extraction type smoke detection system detects smoke concentration by extracting smoke from the chimney of the power plant into a detection unit for detecting smoke concentration. However, the extraction type smoke detection system is prone to errors during the detection process, reducing the accuracy of the smoke detection results. Utility Model Content

[0003] In order to achieve the above objectives, the present disclosure provides a flow rate control device and a smoke detection system.

[0004] A first aspect of the present disclosure provides a flow rate control device, which is applied to a smoke detection system, wherein the smoke detection system is connected to a device to be detected, the smoke detection system includes an auxiliary air inlet, and the flow rate control device includes: a first controller, a variable frequency fan, and a smoke flow rate collector;

[0005] The air outlet of the variable frequency fan is connected to the auxiliary air inlet, and the smoke flow rate collector is arranged on the device to be detected;

[0006] The smoke flow rate collector is used to collect the current flow rate of smoke in the device to be detected;

[0007] The first controller is connected to the variable frequency fan and the smoke flow rate collector, and is used to obtain the current flow rate collected by the smoke flow rate collector and the target flow rate of the smoke in the smoke detection system. The target flow rate is the flow rate at which the smoke detection system extracts the smoke in the equipment to be detected. According to the current flow rate and the target flow rate, the rotation speed of the variable frequency fan is controlled to adjust the target flow rate of the smoke in the smoke detection system.

[0008] Optionally, the variable frequency fan includes a frequency converter and a motor;

[0009] The first controller is connected to the frequency converter and is used to send a control signal to the frequency converter according to a first difference between the current flow rate and the target flow rate;

[0010] The frequency converter is connected to the motor and is used to adjust the rotation speed of the motor according to the control signal when receiving the control signal.

[0011] Optionally, the flow rate control device further comprises: a power interface, the power interface being used to connect to a power supply;

[0012] The power interface is connected to the power supply end of the first controller, the power supply end of the variable frequency fan and the connection end of the smoke flow rate collector.

[0013] A second aspect of the present disclosure provides a smoke detection system, which includes the flow rate control device described in any one of the first aspects of the present disclosure.

[0014] Optionally, the smoke detection system includes a jet pump, a sampling device and a detection device;

[0015] The auxiliary inlet of the jet pump is connected to the air outlet of the variable frequency fan, the inlet of the jet pump is connected to the outlet of the sampling device, and the outlet of the jet pump is connected to the inlet of the detection device;

[0016] The sampling device is connected to the device to be detected and is used to transport smoke and dust in the device to be detected to the detection device;

[0017] The jet pump is used to provide power for conveying smoke to the detection device;

[0018] The first controller is used to control the rotation speed of the variable frequency fan according to the first difference so as to adjust the flow rate of smoke in the sampling device.

[0019] Optionally, the sampling device includes a sampling pipeline and a sampling probe;

[0020] The outlet of the sampling pipeline is connected to the inlet of the jet pump, the inlet of the sampling pipeline is connected to the outlet of the sampling probe, and the sampling probe is arranged in the device to be detected;

[0021] The sampling pipeline is used to transport the smoke and dust in the equipment to be detected collected by the sampling probe to the detection device.

[0022] Optionally, the detection device comprises an opaque cavity, and a light intensity sensor and an emitting light source are arranged on the side wall of the cavity.

[0023] Optionally, the detection device further includes: a second controller;

[0024] The second controller is connected to the light intensity sensor, and is used to obtain the standby light intensity collected by the light intensity sensor, determine a second difference between the standby light intensity and the preset light intensity, and determine the current concentration of smoke in the device to be detected based on the second difference.

[0025] Optionally, the smoke detection system further comprises: a heater;

[0026] The inlet of the heater is connected to the outlet of the sampling device, and the outlet of the heater is connected to the inlet of the detection device.

[0027] Optionally, the detection device further comprises: a smoke and dust recycle pipe;

[0028] The outlet of the detection device is connected to the equipment to be detected through the smoke and dust replay pipeline.

[0029] The above technical scheme, by setting a first controller, a variable frequency fan and a smoke flow rate collector on the flow rate control device, the air outlet of the variable frequency fan is connected to the auxiliary air inlet of the smoke detection system, and the current flow rate of the smoke in the equipment to be detected collected by the smoke flow rate collector and the target flow rate of the smoke in the smoke detection system are obtained by the first controller. According to the current flow rate and the target flow rate, the rotation speed of the variable frequency fan is controlled, and the target flow rate of the smoke in the smoke detection system can be effectively adjusted so that the flow rate difference between the target flow rate and the current flow rate of the smoke in the equipment to be detected is maintained within a certain range, thereby reducing the error in the smoke detection process, improving the accuracy of the detection results of the smoke detection system, and facilitating the improvement of the power generation efficiency of the power plant.

[0030] Other features and advantages of the present disclosure will be described in detail in the following detailed description. BRIEF DESCRIPTION OF THE DRAWINGS

[0031] The accompanying drawings are used to provide a further understanding of the present disclosure and constitute a part of the specification. Together with the following specific embodiments, they are used to explain the present disclosure but do not constitute a limitation of the present disclosure. In the accompanying drawings:

[0032] Figure 1 is a schematic diagram of a flow rate control device according to an exemplary embodiment of the present disclosure;

[0033] Figure 2 The figure is a schematic diagram of the structure of a smoke detection system according to an exemplary embodiment of the present disclosure.

[0034] Description of Reference Numerals

[0035] 101 first controller 102 variable frequency fan

[0036] 103 smoke flow rate collector 201 jet pump

[0037] 202 sampling device 203 detection device

[0038] 204 Heater DETAILED DESCRIPTION

[0039] The specific implementation of the present disclosure is described in detail below in conjunction with the accompanying drawings. It should be understood that the specific implementation described herein is only used to illustrate and explain the present disclosure, and is not used to limit the present disclosure.

[0040] Before introducing the specific implementation methods of the present disclosure in detail, first, the application scenario of the present disclosure is explained. The present disclosure is applied to a smoke detection system. Generally, the smoke detection system in an electric field can be divided into a through-type and an extraction type. Among them, the extraction type smoke detection system detects the smoke concentration by extracting the smoke in the chimney of a power plant into a detection unit for detecting the smoke concentration. However, the flow rate of the smoke extracted from the chimney of the power plant by the extraction type smoke detection system is constant, while the flow rate of the smoke discharged from the chimney of the power plant changes continuously. During the detection process of the extraction type smoke detection system, the flow rate of the smoke extracted is different from the flow rate of the smoke discharged from the chimney of the power plant, which is prone to errors and reduces the accuracy of the smoke detection results.

[0041] To solve the above technical problems, the present disclosure provides a flow rate control device and a smoke detection system, the flow rate control device is applied to the smoke detection system, the smoke detection system is connected to the device to be detected, the smoke detection system includes an auxiliary air inlet, and the flow rate control device includes: a first controller, a variable frequency fan and a smoke flow rate collector; the air outlet of the variable frequency fan is connected to the auxiliary air inlet, and the smoke flow rate collector is arranged on the device to be detected; the smoke flow rate collector is used to collect the current flow rate of the smoke in the device to be detected; the first controller is connected to the variable frequency fan and the smoke flow rate collector, and is used to obtain the current flow rate collected by the smoke flow rate collector and the target flow rate of the smoke in the smoke detection system, the target flow rate is the flow rate at which the smoke detection system extracts the smoke in the device to be detected, and the rotation speed of the variable frequency fan is controlled according to the current flow rate and the target flow rate to adjust the target flow rate of the smoke in the smoke detection system. In this way, a first controller, a variable frequency fan and a smoke flow rate collector are set on the flow rate control device, and the air outlet of the variable frequency fan is connected to the auxiliary air inlet of the smoke detection system. The current flow rate of the smoke in the equipment to be detected collected by the smoke flow rate collector and the target flow rate of the smoke in the smoke detection system are obtained by the first controller. The rotation speed of the variable frequency fan is controlled according to the current flow rate and the target flow rate. The target flow rate of the smoke in the smoke detection system can be effectively adjusted so that the flow rate difference between the target flow rate and the current flow rate of the smoke in the equipment to be detected is maintained within a certain range, thereby reducing the error in the smoke detection process, improving the accuracy of the detection results of the smoke detection system, and facilitating the improvement of the power generation efficiency of the power plant.

[0042] Figure 1 is a schematic diagram of a flow rate control device according to an exemplary embodiment of the present disclosure, the flow rate control device can be applied to a smoke detection system, the smoke detection system can be connected to a device to be detected, and the smoke detection system can include an auxiliary air inlet, such as Figure 1As shown, the flow rate control device may include: a first controller 101, a variable frequency fan 102 and a smoke flow rate collector 103; the air outlet of the variable frequency fan 102 may be connected to the auxiliary air inlet, and the smoke flow rate collector 103 may be arranged on the device to be detected; the smoke flow rate collector 103 may be used to collect the current flow rate of the smoke in the device to be detected; the first controller 101 may be connected to the variable frequency fan 102 and the smoke flow rate collector 103, and is used to obtain the current flow rate collected by the smoke flow rate collector 103 and the target flow rate of the smoke in the smoke detection system, the target flow rate may be the flow rate at which the smoke detection system extracts the smoke in the device to be detected, and according to the current flow rate and the target flow rate, the rotation speed of the variable frequency fan 102 is controlled to adjust the target flow rate of the smoke in the smoke detection system.

[0043] Among them, the first controller 101 can be a PLC (Programmable Logic Controller), a DSP (Digital Signal Processor), a PID (Proportional-Integral-Derivative Controller) or an MCU (Microcontroller Unit), etc. The smoke flow rate collector 103 can be a Pitot tube wind speed sensor, a thermal wind speed sensor or an ultrasonic flow rate sensor. The first controller 101 can obtain the target flow rate of the smoke in the smoke detection system by the current rotation speed of the variable frequency fan 102. For example, a preset flow rate correspondence relationship can be obtained. The preset flow rate correspondence relationship can be used to characterize the correspondence between the rotation speed of the variable frequency fan 102 and the flow rate of the smoke in the smoke detection system, and the current flow rate of the smoke in the smoke detection system is obtained from the preset correspondence relationship according to the current rotation speed of the variable frequency fan 102.

[0044] It should be noted that the smoke flow rate collector 103 can collect the current flow rate of smoke in the equipment to be detected (for example, the chimney of a power plant), and send the collected current flow rate to the first controller 101. The first controller 101 can determine the first target flow rate difference between the current flow rate and the target flow rate, and obtain the preset wind speed adjustment correspondence. The preset wind speed adjustment correspondence can be used to characterize the correspondence between the flow rate difference and the wind speed adjustment parameter. According to the first target flow rate difference and the preset wind speed adjustment correspondence, the first target wind speed adjustment parameter of the variable frequency fan 102 is determined, and the speed of the variable frequency fan 102 is adjusted according to the first target wind speed adjustment parameter. The rotation speed of the variable frequency fan 102 is positively correlated with the target flow rate of the smoke in the smoke detection system (that is, as the rotation speed of the variable frequency fan 102 increases, the target flow rate of the smoke in the smoke detection system also increases, and vice versa). When the rotation speed of the variable frequency fan 102 changes, the target flow rate of the smoke in the smoke detection system changes, so that the flow rate difference between the target flow rate of the smoke in the smoke detection system and the current flow rate of the smoke in the equipment to be detected is maintained within a preset difference range, which can improve the accuracy of the smoke detection system in detecting smoke concentration.

[0045] It should also be noted that the first controller 101 can also obtain the load change of the power plant, determine the predicted flow rate of the smoke in the equipment to be detected based on the load change and the current flow rate of the smoke in the equipment to be detected, and determine the second target flow rate difference between the predicted flow rate and the target flow rate of the smoke in the smoke detection system, determine the second target wind speed adjustment parameter of the variable frequency fan 102 based on the corresponding relationship between the first target flow rate difference and the preset wind speed adjustment, and adjust the rotation speed of the variable frequency fan 102 based on the second target wind speed adjustment parameter so that the flow rate difference between the target flow rate of the smoke in the smoke detection system and the current flow rate of the smoke in the equipment to be detected remains within the preset difference range.

[0046] Optionally, the variable frequency fan 102 may include a frequency converter and a motor; the first controller 101 may be connected to the frequency converter to send a control signal to the frequency converter based on a first difference between the current flow rate and the target flow rate; the frequency converter may be connected to the motor to adjust the speed of the motor according to the control signal when receiving the control signal.

[0047] The first controller 101 can generate a control signal corresponding to the wind speed adjustment parameter according to the wind speed adjustment parameter when determining the wind speed adjustment parameter of the variable frequency fan 102, and send the control signal to the frequency converter. The frequency converter can adjust the speed of the motor according to the wind speed adjustment parameter in the control signal when receiving the control signal.

[0048] It should be noted that the output port of the frequency converter can be connected to the terminal corresponding to the motor, for example, the output port of the frequency converter can include a U port, a V port and a W port, the terminal of the motor can include a U terminal, a V terminal and a W terminal, the U port of the frequency converter is connected to the U terminal of the motor, the V port of the frequency converter is connected to the V terminal of the motor, and the W port of the frequency converter is connected to the W terminal of the motor. The frequency converter can convert the first alternating current of a fixed frequency into a second alternating current of an adjustable frequency, output the second alternating current to the motor, and adjust the motor speed by changing the frequency of the second alternating current. The variable frequency fan 102 can also include a shaft and a fan blade, the motor is connected to the fan blade through the shaft, when the motor rotates, the fan blade is driven to rotate by the shaft to generate airflow, and the flow of smoke in the smoke detection system is driven by the flow of airflow, so that the flow rate of smoke in the smoke detection system can be changed by changing the speed of the variable frequency fan 102.

[0049] Optionally, the flow rate control device may also include: a power supply interface, which can be used to connect a power supply; the power supply interface can be connected to the power supply end of the first controller 101, the power supply end of the variable frequency fan 102 and the connection end of the smoke flow rate collector 103.

[0050] It should be noted that the power interface may include a positive power interface and a negative power interface, the positive power interface is connected to the positive power terminal of the first controller 101, the positive power terminal of the variable frequency fan 102 and the positive terminal of the smoke flow rate collector 103, and the negative power interface is connected to the negative power terminal of the first controller 101, the negative power terminal of the variable frequency fan 102 and the negative terminal of the smoke flow rate collector 103. When the power interface is connected to the power supply, the power supply provides voltage to the first controller 101, the variable frequency fan 102 and the smoke flow rate collector 103 through the power interface.

[0051] The above technical scheme can be implemented by setting a first controller, a variable frequency fan and a smoke flow rate collector on the flow rate control device, the air outlet of the variable frequency fan is connected to the auxiliary air inlet of the smoke detection system, and the current flow rate of the smoke in the device to be detected collected by the smoke flow rate collector and the target flow rate of the smoke in the smoke detection system are obtained through the first controller. The rotation speed of the variable frequency fan is controlled according to the current flow rate and the target flow rate, and the target flow rate of the smoke in the smoke detection system can be effectively adjusted so that the flow rate difference between the target flow rate and the current flow rate of the smoke in the device to be detected is maintained within a certain range, thereby reducing the error in the smoke detection process, improving the accuracy of the detection results of the smoke detection system, and facilitating the improvement of the power generation efficiency of the power plant.

[0052] An exemplary embodiment of the present disclosure provides a smoke detection system, which may include the above Figure 1 Flow rate control equipment provided.

[0053] Figure 2 is a structural schematic diagram of a smoke detection system according to an exemplary embodiment of the present disclosure. Figure 2 As shown, the smoke detection system includes a jet pump 201, a sampling device 202 and a detection device 203; the auxiliary inlet of the jet pump 201 is connected to the air outlet of the variable frequency fan 102, the inlet of the jet pump 201 is connected to the outlet of the sampling device 202, and the outlet of the jet pump 201 is connected to the inlet of the detection device 203; the sampling device 202 is connected to the device to be detected, and is used to transport the smoke in the device to be detected to the detection device 203; the jet pump 201 is used to provide power for the smoke transported to the detection device 203; the first controller is used to control the rotation speed of the variable frequency fan 102 according to the first difference, so as to adjust the flow rate of the smoke in the sampling device 202.

[0054] The detection device 203 includes an opaque cavity, and a light intensity sensor and an emission light source are arranged on the side wall of the cavity. The cavity can be a three-dimensional structure such as a sphere, a cube, a rectangle or a cylinder. The emission light source can be a laser light source, an electroluminescent light source (for example, a light emitting diode) or a halogen light source. The light intensity sensor is arranged on the side wall position where the light of the emission light source is directly irradiated, and is used to collect the light intensity of the light of the emission light source after passing through the smoke.

[0055] It should be noted that the smoke detection system forms a negative pressure after the jet pump 201 is started, and the smoke in the device to be detected collected by the sampling device 202 is transported to the detection device 203. The detection device 203 detects the smoke concentration through the light intensity sensor and the emission light source set on the side wall of the cavity. The first controller obtains the current flow rate collected by the smoke flow rate collector 103 and the target flow rate of the smoke in the smoke detection system, and determines the first difference between the current flow rate and the target flow rate, generates a control signal corresponding to the first difference, and controls the speed of the variable frequency fan 102, so that the flow rate difference between the flow rate of the smoke in the sampling device 202 and the flow rate of the smoke in the device to be detected is kept within a certain range.

[0056] Optionally, the detection device 203 further includes: a smoke and dust playback pipe; the outlet of the detection device 203 is connected to the device to be detected through the smoke and dust playback pipe.

[0057] It should be noted that the detection device 203 transports the smoke in the detection device 203 to the equipment to be detected through the smoke playback pipe, and the variable frequency fan 102 can also be used to provide power for the smoke transported by the smoke playback pipe, so that the smoke in the detection device 203 is transported to the equipment to be detected at a current flow rate close to the current flow rate of the smoke in the equipment to be detected, thereby preventing the detection device 203 from accumulating too much smoke, resulting in errors in the detection of smoke concentration, and improving the accuracy of the smoke detection system in detecting smoke.

[0058] Optionally, the sampling device 202 includes a sampling pipe and a sampling probe; the outlet of the sampling pipe is connected to the inlet of the jet pump 201, the inlet of the sampling pipe is connected to the outlet of the sampling probe, and the sampling probe is arranged in the equipment to be detected; the sampling pipe is used to transport the smoke and dust in the equipment to be detected collected by the sampling probe to the detection device 203.

[0059] The sampling probe may be made of high temperature resistant and corrosion resistant materials, such as stainless steel, polyethylene (PE), polytetrafluoroethylene (PTFE) or polypropylene (PP).

[0060] It should be noted that the sampling probe is connected to the flue or exhaust duct of the equipment to be detected, the sampling duct connects the sampling probe and the detection device 203, and the smoke in the equipment to be detected is transported to the detection device 203 according to the target flow rate through the power provided by the jet pump 201 and the variable frequency fan 102. The detection device 203 detects the collected smoke to determine the target concentration of the smoke emitted from the flue or exhaust duct of the equipment to be detected.

[0061] Optionally, the sampling device 202 includes multiple sampling pipes and multiple sampling probes, and collects smoke at different positions of the equipment to be detected to determine the smoke concentrations corresponding to the multiple positions. The average of the multiple smoke concentrations is calculated, and the average of the multiple smoke concentrations is used as the target concentration of smoke emitted from the flue or exhaust duct of the equipment to be detected, thereby improving the accuracy of the smoke detection system in detecting smoke.

[0062] Optionally, the detection device 203 also includes: a second controller; the second controller is connected to the light intensity sensor, and is used to obtain the standby light intensity collected by the light intensity sensor, determine a second difference between the standby light intensity and the preset light intensity, and determine the current concentration of smoke in the equipment to be detected based on the second difference.

[0063] The second controller may be a PLC (, DSP (Digital Signal Processor), PID or MCU, etc.

[0064] It should be noted that the second controller pre-stores the light intensity of the emitting light source as the preset light intensity, and uses the standby light intensity of the light passing through the smoke in the detection device 203 collected by the light intensity sensor to determine the second difference between the preset light intensity and the standby light intensity, and obtain the preset concentration correspondence. The preset concentration correspondence is used to characterize the correspondence between the difference between the preset light intensity and the standby light intensity and the smoke concentration. According to the second difference and the preset concentration correspondence, the current concentration of the smoke in the device to be detected is determined.

[0065] Optionally, Figure 2As shown, the smoke detection system further includes: a heater 204 ; the inlet of the heater 204 is connected to the outlet of the sampling device 202 , and the outlet of the heater 204 is connected to the inlet of the detection device 203 .

[0066] The heater 204 may be an electric heater, a heating pipeline heater, a vaporization chamber heater, or the like.

[0067] It should be noted that the heater 204 can be used to heat the smoke in the sampling pipe to prevent the water vapor in the smoke from condensing due to the temperature drop during transportation, thereby blocking the sampling pipe and extending the service life of the smoke detection system. In the detection process, it also prevents the condensation of water vapor in the smoke from interfering with the smoke concentration detection and reducing the accuracy of the smoke detection system in detecting smoke.

[0068] The above technical scheme can be implemented by setting a first controller, a variable frequency fan and a smoke flow rate collector on the flow rate control device, the air outlet of the variable frequency fan is connected to the auxiliary air inlet of the smoke detection system, and the current flow rate of the smoke in the device to be detected collected by the smoke flow rate collector and the target flow rate of the smoke in the smoke detection system are obtained through the first controller. The rotation speed of the variable frequency fan is controlled according to the current flow rate and the target flow rate, and the target flow rate of the smoke in the smoke detection system can be effectively adjusted so that the flow rate difference between the target flow rate and the current flow rate of the smoke in the device to be detected is maintained within a certain range, thereby reducing the error in the smoke detection process, improving the accuracy of the detection results of the smoke detection system, and facilitating the improvement of the power generation efficiency of the power plant.

[0069] The preferred embodiments of the present disclosure are described in detail above in conjunction with the accompanying drawings; however, the present disclosure is not limited to the specific details in the above embodiments. Within the technical concept of the present disclosure, a variety of simple modifications can be made to the technical solution of the present disclosure, and these simple modifications all fall within the protection scope of the present disclosure.

[0070] It should also be noted that the various specific technical features described in the above specific embodiments can be combined in any suitable manner without contradiction. In order to avoid unnecessary repetition, the present disclosure will not further describe various possible combinations.

[0071] In addition, various embodiments of the present disclosure may be arbitrarily combined, and as long as they do not violate the concept of the present disclosure, they should also be regarded as the contents disclosed by the present disclosure.

Claims

1. A flow rate control device, characterized in that: Applied to a smoke detection system, the smoke detection system is connected to a device to be detected, the smoke detection system includes an auxiliary air inlet, and the flow rate control device includes: a first controller, a variable frequency fan and a smoke flow rate collector; The air outlet of the variable frequency fan is connected to the auxiliary air inlet, and the smoke flow rate collector is arranged on the device to be detected; The smoke flow rate collector is used to collect the current flow rate of smoke in the device to be detected; The first controller is connected to the variable frequency fan and the smoke flow rate collector, and is used to obtain the current flow rate collected by the smoke flow rate collector and the target flow rate of the smoke in the smoke detection system. The target flow rate is the flow rate at which the smoke detection system extracts the smoke in the equipment to be detected. According to the current flow rate and the target flow rate, the rotation speed of the variable frequency fan is controlled to adjust the target flow rate of the smoke in the smoke detection system.

2. The flow rate control device according to claim 1, characterized in that: The variable frequency fan includes a frequency converter and a motor; The first controller is connected to the frequency converter and is used to send a control signal to the frequency converter according to a first difference between the current flow rate and the target flow rate; The frequency converter is connected to the motor and is used to adjust the rotation speed of the motor according to the control signal when receiving the control signal.

3. The flow rate control device according to claim 1, characterized in that: The flow rate control device further comprises: a power interface, the power interface being used to connect to a power supply; The power interface is connected to the power supply end of the first controller, the power supply end of the variable frequency fan and the connection end of the smoke flow rate collector.

4. A smoke detection system, characterized in that: The smoke detection system comprises the flow rate control device according to any one of claims 1 to 3 above.

5. The smoke detection system according to claim 4, characterized in that: The smoke detection system comprises a jet pump, a sampling device and a detection device; The auxiliary inlet of the jet pump is connected to the air outlet of the variable frequency fan, the inlet of the jet pump is connected to the outlet of the sampling device, and the outlet of the jet pump is connected to the inlet of the detection device; The sampling device is connected to the device to be detected and is used to transport smoke and dust in the device to be detected to the detection device; The jet pump is used to provide power for conveying smoke to the detection device; The first controller is used to control the rotation speed of the variable frequency fan according to the first difference so as to adjust the flow rate of smoke in the sampling device.

6. The smoke detection system according to claim 5, characterized in that: The sampling device comprises a sampling pipeline and a sampling probe; The outlet of the sampling pipeline is connected to the inlet of the jet pump, the inlet of the sampling pipeline is connected to the outlet of the sampling probe, and the sampling probe is arranged in the device to be detected; The sampling pipeline is used to transport the smoke and dust in the equipment to be detected collected by the sampling probe to the detection device.

7. The smoke detection system according to claim 5, characterized in that: The detection device comprises an opaque cavity, and a light intensity sensor and an emitting light source are arranged on the side wall of the cavity.

8. The smoke detection system according to claim 7, characterized in that: The detection device further includes: a second controller; The second controller is connected to the light intensity sensor, and is used to obtain the standby light intensity collected by the light intensity sensor, determine a second difference between the standby light intensity and the preset light intensity, and determine the current concentration of smoke in the device to be detected based on the second difference.

9. The smoke detection system according to claim 5, characterized in that: The smoke detection system further includes: a heater; The inlet of the heater is connected to the outlet of the sampling device, and the outlet of the heater is connected to the inlet of the detection device.

10. The smoke detection system according to claim 5, characterized in that: The detection device also includes: a smoke and dust replay pipe; The outlet of the detection device is connected to the equipment to be detected through the smoke and dust replay pipeline.

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