A control valve, an oil fume exhaust system and a control method thereof

Abstract

The embodiment of the present invention discloses a control valve, an oil fume exhaust system, and a control method thereof, wherein the control valve includes: a valve plate; a pressure sensor for detecting a first pressure value borne by the valve plate when a fan is running; and a control box for calculating the current air volume in the oil fume exhaust duct based on the first pressure value, and feedback-controlling the rotation of the valve plate based on the current air volume in the oil fume exhaust duct until the air volume in the oil fume exhaust duct reaches a preset air volume. By using the pressure sensor to detect the pressure and thereby adjust the air volume of the control valve, even if the internal environment of the oil fume exhaust duct changes, it will not affect the normal reading of the pressure value by the pressure sensor. The control valve can still adjust the air volume according to the value of the pressure sensor, and has a strong self-regulating function. In addition, the air volume can be calculated with a high accuracy by using the pressure value, and the problem of low air volume adjustment accuracy caused by errors in the feedback voltage when the valve plate angle is determined by analog voltage to control the air volume in the prior art can be avoided.

Description

Technical Field

[0001] The embodiments of the present invention relate to the field of electrical control technology, and in particular to a control valve, an oil fume exhaust system, and a control method thereof. Background Art

[0002] When using an exhaust system to discharge oil fumes, a control valve is usually installed in the exhaust pipe to control the air volume. As people's living conditions gradually improve, the amount of oil fume emissions also increases, and the requirements for the accuracy of the control valve in regulating the air volume are becoming more and more stringent.

[0003] The current control valves on the market all control the air volume by outputting an analog voltage to the actuator to determine the valve opening angle, and then determine whether the valve is fully opened by receiving the feedback voltage from the actuator. However, when the valve is used for too long, the accumulation of oil and dirt and the end of the service life of the structural parts will cause deviations in the controlled air volume. In addition, the control valves in the existing technology can only set the air volume but not keep it constant. When the internal environment of the control valve changes, it cannot perform self-adjustment. Summary of the Invention

[0004] In view of the above-mentioned deficiencies in the prior art, embodiments of the present invention provide a control valve, an oil fume exhaust system and a control method thereof, so as to improve the intelligence and accuracy of the air volume control of the control valve.

[0005] In a first aspect, an embodiment of the present invention provides a control valve for use in an oil fume exhaust system, wherein the oil fume exhaust system further includes a fan and an oil fume exhaust pipe, and the control valve is disposed in the oil fume exhaust pipe, wherein the control valve includes:

[0006] valve plate;

[0007] A pressure sensor is used to detect a first pressure value borne by the valve plate when the fan is running and send the first pressure value to a control box;

[0008] The control box is used to calculate the current air volume in the exhaust fume duct according to the first pressure value, and feedback-control the rotation of the valve plate according to the current air volume in the exhaust fume duct until the air volume in the exhaust fume duct reaches a preset air volume.

[0009] Optionally, in an exemplary embodiment, the control valve further comprises: an angle sensor, the angle sensor being configured to detect a rotation angle of the valve plate and transmit the rotation angle to the control box;

[0010] The control box is further used to control the valve disc to rotate from a first angle to an angle corresponding to the preset air volume, wherein the first angle is the angle of the valve disc when the control valve starts to operate;

[0011] The control box is further configured to control the rotation of the valve disc according to feedback of the rotation angle of the valve disc until the rotation angle of the valve disc is equal to the angle difference between the angle corresponding to the preset air volume and the first angle.

[0012] Optionally, in an exemplary embodiment, the control box is further configured to control the valve plate to rotate from the preset angle to the first angle upon receiving a stop command;

[0013] The pressure sensor is further used to detect a second pressure value borne by the valve plate and send the second pressure value to the control box;

[0014] The control box is also used to generate fault information and upload it to the cloud when the second pressure value remains zero for a preset threshold time, and at the same time control the valve plate to stop rotating.

[0015] Optionally, in an exemplary embodiment, the control box is further configured to control the valve plate to stop rotating when the second pressure value gradually increases to a third pressure value and no longer changes.

[0016] Optionally, in an exemplary embodiment, the control box is also used to calculate the current static pressure value in the exhaust duct based on the first pressure value borne by the valve plate; and obtain the current air volume in the exhaust duct based on the current static pressure value in the exhaust duct.

[0017] Optionally, in an exemplary embodiment, the control valve further includes a rotating shaft, wherein the rotating shaft is connected to the valve disc and is used to drive the valve disc to rotate;

[0018] The rotation axis is arranged at the symmetry axis position of the valve plate, and the pressure sensors are arranged at both side edges of the valve plate away from the rotation axis.

[0019] Optionally, in an exemplary embodiment, the control valve further includes an actuator electrically connected to the control box and the rotating shaft, and configured to control the rotation of the rotating shaft according to a control signal from the control box;

[0020] The control box is electrically connected to the pressure sensor and the actuator via a signal line, wherein the signal line is arranged inside the rotating shaft and / or the valve plate.

[0021] Optionally, in an exemplary embodiment, the pressure sensor and the angle sensor are integrated into a sensor module.

[0022] Optionally, in an exemplary embodiment, the valve plates include at least two, and the at least two valve plates extend along a first direction and are arranged along a second direction, and the first direction intersects with the second direction;

[0023] The rotating shaft includes a main shaft and at least one driven shaft, at least one of the two valve plates is connected to the main shaft, and the other valve plates are correspondingly connected to the driven shaft, and the main shaft and the driven shaft are connected by a connecting rod.

[0024] In a second aspect, an embodiment of the present invention further provides an oil fume exhaust system, comprising the control valve provided by any embodiment of the present invention, the oil fume exhaust system further comprising an oil fume exhaust pipe and a fan, and the control valve is arranged in the oil fume exhaust pipe.

[0025] In a third aspect, an embodiment of the present invention further provides a control method for an oil fume exhaust system, which is applied to any oil fume exhaust system described in the second aspect of the present invention, wherein the control method includes:

[0026] Obtaining a first pressure value borne by the valve plate when the fan is running;

[0027] Calculating the current air volume in the exhaust fume duct according to the first pressure value;

[0028] According to the current air volume in the oil fume exhaust duct, the valve plate is feedback-controlled to rotate until the air volume in the oil fume exhaust duct reaches a preset air volume.

[0029] Optionally, in an exemplary embodiment, before obtaining the first pressure value borne by the valve plate when the fan is running, the method further includes:

[0030] Controlling the valve disc to rotate from a first angle to an angle corresponding to the preset air volume, wherein the first angle is the angle of the valve disc when the control valve starts to operate;

[0031] Obtaining the rotation angle of the valve plate;

[0032] The valve disc is controlled to rotate according to feedback of the rotation angle of the valve disc until the rotation angle of the valve disc is equal to the angle difference between the angle corresponding to the preset air volume and the first angle.

[0033] Optionally, in an exemplary embodiment, after feedback controlling the rotation of the valve plate according to the current air volume in the oil fume exhaust duct until the air volume in the oil fume exhaust duct reaches a preset air volume, the method further includes:

[0034] When a stop command is received, the valve plate is controlled to rotate to the first angle;

[0035] Obtaining a second pressure value borne by the valve plate;

[0036] When the second pressure value remains zero for a predetermined period of time, a fault message is generated and uploaded to the cloud, and the valve plate is controlled to stop rotating.

[0037] Optionally, in an exemplary embodiment, after obtaining the second pressure value borne by the valve plate, the method further includes:

[0038] When the second pressure value gradually increases to a third pressure value and no longer changes, the valve plate is controlled to stop rotating.

[0039] Optionally, in an exemplary embodiment, calculating the current air volume in the oil fume exhaust duct according to the first pressure value includes:

[0040] Calculating a current static pressure value in the oil fume exhaust duct according to a first pressure value borne by the valve plate;

[0041] The current air volume in the oil fume exhaust duct is obtained according to the current static pressure value in the oil fume exhaust duct.

[0042] In an embodiment of the present invention, by installing a pressure sensor in the control valve, during the operation of the fan, the pressure sensor can detect the first pressure value borne by the valve plate, that is, the pressure exerted on the valve plate by the gas in the exhaust pipe when the fan is running; then the control box calculates the current air volume in the exhaust pipe based on the first pressure value sent by the pressure sensor, and based on the current air volume in the exhaust pipe, feedback controls the rotation of the valve plate so that the air volume passing through the control valve reaches the preset air volume, thereby realizing real-time monitoring and adjustment of the air volume. By using the pressure sensor to detect the pressure and thus adjust the air volume of the control valve, even if the internal environment of the exhaust pipe changes, it will not affect the normal reading of the pressure value by the pressure sensor. The control valve can still adjust the air volume according to the value of the pressure sensor, and has a certain self-regulating function; in addition, calculating the air volume by the pressure value can achieve higher accuracy, and can also avoid the problem of low air volume adjustment accuracy caused by the error in the feedback voltage when the valve angle is determined by analog voltage to control the air volume in the prior art. BRIEF DESCRIPTION OF THE DRAWINGS

[0043] Figure 1 A schematic structural diagram of a control valve provided in an embodiment of the invention;

[0044] Figure 2 for Figure 1 a side view of the control valve shown;

[0045] Figure 3 A top view of a valve plate provided in an embodiment of the present invention;

[0046] Figure 4 A cross-sectional view of a valve plate provided in an embodiment of the present invention;

[0047] Figure 5 A flow chart of a method for controlling an oil fume exhaust system provided by an embodiment of the present invention;

[0048] Figure 6 A flow chart of another method for controlling an oil fume exhaust system provided by an embodiment of the present invention;

[0049] Figure 7 A control logic diagram of an oil fume exhaust system provided by an embodiment of the present invention;

[0050] Figure 8 This is a control logic diagram of another oil fume exhaust system provided by an embodiment of the present invention.

[0051] In the figure: 1-valve plate; 2-pressure sensor; 3-control box; 4-angle sensor; 5-rotation shaft; 6-actuator; 7-signal line; 8-sensor module; 9-main shaft; 10-driven shaft; 11-connecting rod. DETAILED DESCRIPTION

[0052] The present invention will be further described in detail below with reference to the accompanying drawings and examples. It will be understood that the specific embodiments described herein are intended only to illustrate the present invention and are not intended to limit the present invention. It should also be noted that, for ease of description, the accompanying drawings only illustrate portions relevant to the present invention, not all structures.

[0053] An embodiment of the present invention provides a control valve, which is applied to an oil fume exhaust system. The oil fume exhaust system further includes a fan and an oil fume exhaust pipe, and the control valve is arranged in the oil fume exhaust pipe. Figure 1 A schematic diagram of the structure of a control valve provided by an embodiment of the invention, Figure 2 for Figure 1 A side view of the control valve is shown, as Figure 1 and Figure 2 As shown, the control valve includes: a valve plate 1;

[0054] Pressure sensor( Figure 1 and 2 (not shown) for detecting a first pressure value borne by the valve plate 1 when the fan is running and sending the first pressure value to the control box 3;

[0055] The control box 3 is used to calculate the current air volume in the exhaust fume duct according to the first pressure value, and feedback control the rotation of the valve plate 1 according to the current air volume in the exhaust fume duct until the air volume in the exhaust fume duct reaches the preset air volume.

[0056] The control valve, also known as the regulating valve, receives a control signal from the control box 3 and uses power to change the fluid flow rate. The control valve has a valve disc 1, which can adjust the fluid flow rate by controlling the rotation angle of the valve disc 1. The working process of the control valve can be simply described as follows: when the valve disc 1 completely blocks the valve port of the control valve and the fluid cannot pass through, the valve disc 1 is in a closed state, and the control valve is also in a closed state; as the rotation angle of the valve disc 1 is adjusted, the valve port opens and the fluid can pass through. Moreover, the different angles of the valve disc 1 and the different areas of the valve port opening will result in different fluid flow rates. Figure 1 The valve disc 1 of the control valve shown in the figure can rotate in the direction indicated by the arrow. Therefore, the fluid flow rate can be adjusted by adjusting the rotation angle of the valve disc 1. The embodiment of the present invention does not limit the type of control valve, and it can be configured as a multi-leaf split damper, a butterfly valve, or a single-door damper, but is not limited to the above dampers.

[0057] Furthermore, during operation, the fan draws ambient air into the exhaust duct. Due to the velocity of the gas flow, this exerts a certain pressure on the control valve. In this embodiment of the present invention, a pressure sensor is provided within the control valve to detect a first pressure value experienced by valve disc 1 of the control valve. This first pressure value represents the pressure exerted on valve disc 1 by the gas within the exhaust duct when the fan is operating. Simultaneously, the pressure sensor is electrically connected to control box 3, transmitting the detected first pressure value to control box 3. It is understood that the gas pressure experienced by valve disc 1 varies at different rotation angles, and the air volume within the exhaust duct also varies. Figure 1 and 2 The specific position of the pressure sensor is not shown. It can be understood that the setting position of the pressure sensor can be set according to actual conditions, such as being set on the valve plate 1, or other settings, but it should be ensured that the pressure sensor can accurately collect the accurate value of the first pressure value that the valve plate 1 is subjected to. Figure 3 A top view of a valve plate provided in an embodiment of the present invention, such as Figure 3 As shown, in the embodiment of the present invention, the pressure sensor 2 can be arranged on the valve plate 1.

[0058] Furthermore, control box 3 serves as the control unit for the entire control valve, regulating and controlling the entire valve. Specifically, after receiving the first pressure value transmitted by pressure sensor 2, control box 3 calculates the current air volume within the exhaust duct based on the first pressure value. The present invention does not limit the specific method for calculating the air volume based on the first pressure value; any method capable of calculating the air volume based on the pressure experienced by valve plate 1 falls within the scope of the technical solutions protected by the present invention.

[0059] Optionally, the embodiment of the present invention does not limit the location of the control box 3. Figure 1 and Figure 2As shown in the figure, it is arranged above the control valve body to reduce the influence of other structures of the control valve on the control box 3 during operation. It can also be arranged at any position of the control valve according to actual needs.

[0060] It is understood that the amount of gas passing through the control valve varies depending on the angle at which the valve disc 1 rotates. As the valve disc 1 rotates 90 degrees from its closed position, the open area of the control valve orifice gradually increases, and the amount of air passing through the control valve also gradually increases. In an embodiment of the present invention, during the factory delivery of the control valve, a preset air volume for the control valve, i.e., the ventilation volume of the control valve orifice, can be set based on the user's actual needs. During use of the control valve, when the control box 3 determines that the air volume in the exhaust duct has reached the preset air volume, the valve disc 1 can be controlled to stop rotating, maintaining the angle of the valve disc 1 to maintain the ventilation volume at the preset air volume. If the current air volume in the exhaust duct is different from the preset air volume, the valve disc 1 can be controlled to rotate again until the air volume in the exhaust duct reaches the preset air volume. The preset air volume setting can be selected based on the actual application scenario of the control valve. For example, if the control valve is used in a small restaurant, a smaller preset air volume can be set; if the control valve is used in a large restaurant, a larger preset air volume can be set to meet the user's exhaust needs.

[0061] In the embodiment of the present invention, by installing a pressure sensor 2 in the control valve, during the operation of the fan, the pressure sensor 2 can detect the first pressure value borne by the valve plate 1, that is, the pressure exerted on the valve plate 1 by the gas in the exhaust pipe when the fan is running; then the control box 3 calculates the current air volume in the exhaust pipe based on the first pressure value sent by the pressure sensor 2, and based on the current air volume in the exhaust pipe, feedback controls the rotation of the valve plate 1 so that the air volume passing through the control valve reaches the preset air volume, thereby realizing real-time monitoring and adjustment of the air volume. By using the pressure sensor 2 to detect the pressure and thus adjust the air volume of the control valve, even if the internal environment of the exhaust pipe changes, it will not affect the normal reading of the pressure value by the pressure sensor 2. The control valve can still adjust the air volume according to the value of the pressure sensor 2, and has a certain self-regulating function; in addition, the air volume can be calculated by the pressure value to achieve a higher accuracy, and it can also avoid the problem of low air volume adjustment accuracy caused by the error in the feedback voltage when the valve plate 1 angle is determined by analog voltage to control the air volume in the prior art.

[0062] Optional, can still refer to Figure 1-3 In an exemplary embodiment, the control valve may further include: an angle sensor 4, the angle sensor 4 is used to detect the rotation angle of the valve plate 1 and send the rotation angle to the control box 3;

[0063] The control box 3 is also used to control the valve plate 1 to rotate from a first angle to an angle corresponding to a preset air volume. The first angle is the angle of the valve plate 1 when the control valve starts to operate.

[0064] The control box 3 is further used to control the rotation of the valve disc 1 according to the feedback of the rotation angle of the valve disc 1 until the rotation angle of the valve disc 1 is equal to the angle difference between the angle corresponding to the preset air volume and the first angle.

[0065] It is understood that the air volume can be calculated by multiplying the valve opening area by the wind speed, and the valve opening area is related to the rotation angle of the valve disc 1. Therefore, it can be concluded that the air volume passing through the control valve, i.e., the air volume in the exhaust duct, corresponds to the rotation angle of the valve disc 1. In other words, when the preset air volume is determined, the rotation angle of the valve disc 1 is also determined accordingly. Therefore, in the embodiment of the present invention, the rotation angle of the valve disc 1 can be detected to determine whether the air volume passing through the control valve has reached the preset air volume.

[0066] It can be understood that when the control valve is not working, the valve plate 1 should be in a closed state. When the fume exhaust system needs to work, the control box 3 can first control the valve plate 1 to rotate from the closed state to the angle corresponding to the preset air volume, that is, the control valve plate 1 rotates from the first angle to the angle corresponding to the preset air volume. The first angle is the angle at which the valve plate 1 is when the control valve starts to operate.

[0067] Furthermore, an angle sensor 4 may be provided in the control valve to detect the rotation angle of the valve disc 1 in real time and send the detected rotation angle of the valve disc 1 to the control box 3. The location of the angle sensor 4 may be set according to actual conditions, for example, Figure 3 As shown in FIG, the angle sensor 4 is arranged at the same position as the pressure sensor 2, but is not limited thereto. Those skilled in the art may arrange the position of the angle sensor 4 according to actual conditions.

[0068] Furthermore, the control box 3 determines whether the rotation angle of the valve plate 1 is equal to the angle difference between the angle corresponding to the preset air volume and the first angle, that is, the control box 3 determines whether the rotation angle of the valve plate 1 reaches the angle corresponding to the preset air volume. If the rotation angle of the valve plate 1 is not equal to the angle difference between the angle corresponding to the preset air volume and the first angle, the valve plate 1 continues to be controlled to rotate until the rotation angle of the valve plate 1 is equal to the angle difference between the angle corresponding to the preset air volume and the first angle.

[0069] Of course, the method for collecting the rotation angle of the valve disc 1 is not limited to collecting it through the angle sensor 4. Since the angle sensor 4 has low cost, is easy to install, and the measurement results are intuitive and accurate, in the embodiment of the present invention, the angle sensor 4 is preferably set to collect the rotation angle of the valve disc 1. In other possible embodiments, other schemes can also be selected according to actual needs. For example, the offset distance of the valve disc 1 is collected through components such as infrared ranging sensors or ultrasonic ranging sensors, and the rotation angle of the valve disc 1 is calculated based on the offset distance.

[0070] In addition, optionally, the control valve in the embodiment of the present invention can also be electrically connected to the main controller, and the main controller is also connected to the fan. When the control valve determines that the rotation angle of the valve plate 1 reaches the angle corresponding to the preset air volume, it can send an open signal to the main controller. After receiving the open signal, the main controller controls the fan to start running.

[0071] In an embodiment of the present invention, an angle sensor 4 is provided to detect the rotation angle of the valve disc 1. When the angle sensor 4 detects that the rotation angle of the valve disc 1 reaches the angle corresponding to the preset air volume, the fan operation is controlled. This solves the problem that in the prior art, when the rotation angle of the valve disc 1 is determined based on the analog voltage, after the valve disc 1 has been used for too long, due to the accumulation of oil and dirt and the end of the service life of the structural parts, the valve disc 1 still feeds back the analog voltage at the angle corresponding to the preset air volume when it has not reached the angle corresponding to the preset air volume, resulting in an air volume deviation. The rotation angle of the valve disc 1 can be accurately measured, thereby improving the accuracy of the control valve operation.

[0072] Optionally, in an exemplary embodiment, the control box 3 is further configured to control the valve plate 1 to rotate from a preset angle to a first angle upon receiving a stop command;

[0073] The pressure sensor 2 is further used to detect a second pressure value borne by the valve plate 1 and send the second pressure value to the control box 3;

[0074] The control box 3 is also used to generate fault information and upload it to the cloud when the second pressure value remains zero for a preset threshold time, and at the same time control the valve plate 1 to stop rotating.

[0075] Specifically, when the fume exhaust system is no longer required, the main controller can control the fan to shut down and send a stop command to the control box 3. Upon receiving the stop command, the control box 3 controls the valve disc 1 to rotate back from the preset angle to the first angle, i.e., controls the valve disc 1 to gradually close. During the gradual closing process of the valve disc 1, the valve disc 1 may collide with or squeeze the control valve body or an adjacent valve disc 1. In an embodiment of the present invention, the pressure sensor 2 can also detect a second pressure value experienced by the valve disc 1. This second pressure value represents the squeezing force experienced by the valve disc 1 during the closing process. It is understood that if the second pressure value detected by the pressure sensor 2 remains zero for a predetermined threshold time during the closing process of the valve disc 1, i.e., the pressure sensor 2 has no sensing, this indicates that the valve disc 1 did not contact the valve body or other valve discs 1 during closing, and further indicates that the valve disc 1 failed to close normally. At this time, the control box 3 controls the valve disc 1 to stop rotating, determines that the control valve is faulty, generates fault information, and uploads it to the cloud. After receiving the fault information, maintenance personnel can inspect the control valve.

[0076] The preset threshold time can be set according to actual conditions, for example, according to the size of the control valve or the valve plate 1, the closing speed of the valve plate 1, etc., and is not limited here.

[0077] In an embodiment of the present invention, during the closing process of the control valve plate 1, if the second pressure value detected by the pressure sensor 2 remains zero within the preset threshold time, that is, the pressure sensor 2 detects that the valve plate 1 is not working normally, a fault message is generated and uploaded to the cloud, so that the staff can inspect and repair the control valve as soon as possible, avoiding the control valve from failing to complete its work normally for a long time, causing user dissatisfaction.

[0078] Optionally, in an exemplary embodiment, the control box 3 is further configured to control the valve plate 1 to stop rotating when the second pressure value gradually increases to a third pressure value and no longer changes.

[0079] Specifically, during the normal closing process of the valve disc 1, the extrusion force received by the valve disc 1 gradually increases due to the collision or extrusion between the valve disc 1 and the control valve body or the adjacent valve disc 1. When the second pressure value detected by the pressure sensor 2 gradually increases to the third pressure value and no longer changes, it indicates that the valve disc 1 has been completely closed. At this time, the control box 3 can control the valve disc 1 to stop rotating, preventing the valve disc 1 from continuing to rotate and causing damage to the valve disc 1. If the valve disc 1 is rotated by an execution unit, such as an actuator outputting torque, the control box 3 controls the valve disc 1 to stop rotating, which can also prevent the valve disc 1 from continuing to rotate and causing damage to the actuator. The third pressure value can be obtained through experiments, and the embodiment of the present invention does not limit the specific numerical value of the third pressure value.

[0080] Optionally, in an exemplary embodiment, the control box 3 is also used to calculate the current static pressure value P in the exhaust duct based on the first pressure value borne by the valve plate 1; and obtain the current air volume Q in the exhaust duct based on the current static pressure value P in the exhaust duct.

[0081] Specifically, during the operation of the fan, the valve plate 1 will add different resistances to the exhaust pipe at different rotation angles. In the embodiment of the present invention, the first pressure value F detected by the pressure sensor 2 is sent to the control box 3, and the control box 3 calculates the pressure loss P of the valve plate 1 at this time. 损 , specifically, P 损 =F / S, where S is the opening area of the control valve port, which can be calculated based on the rotation angle of the valve plate 1. The pressure loss of the valve plate 1 is P 损 and the preset pipeline pressure loss P 预 The sum of is the current static pressure value P in the exhaust fume duct; and during the operation of the fan, if the operating frequency is fixed, the relationship between its current static pressure value P and the current air volume Q is certain, that is, its PQ curve is fixed, and the corresponding current air volume Q can be determined according to the current static pressure value P.

[0082] The current static pressure value P in the exhaust fume duct is calculated according to the first pressure value, and then the current air volume Q is determined according to the PQ curve. The calculation process is very simple and the result is relatively accurate, which is conducive to further improving the accuracy of the control valve operation.

[0083] In addition, as described in the above embodiment, if the calculated current air volume Q is not equal to the preset air volume, the rotation angle of the valve plate 1 can continue to be adjusted, and the angle sensor 4 can also detect the rotation angle of the valve plate 1 in real time, so that the valve plate 1 rotates to the angle corresponding to the preset air volume. It can be understood that when the rotation angle of the valve plate 1 changes, the above calculation process can be repeated until the current air volume Q is equal to the preset air volume.

[0084] Optionally, in an exemplary embodiment, the control valve further includes a rotating shaft 5 , which is connected to the valve disc 1 and is used to drive the valve disc 1 to rotate;

[0085] The rotation axis 5 is arranged at the symmetry axis position of the valve plate 1 , and the pressure sensors 2 are arranged at the two side edges of the valve plate 1 away from the rotation axis 5 .

[0086] For example, please refer to Figure 1-3 The control valve provided in the embodiment of the present invention may further include a rotating shaft 5, which is connected to the valve disc 1. The valve disc 1 is driven by the rotating shaft 5, and the rotating shaft 5 is arranged at the symmetric axis position of the valve disc 1. The embodiment of the present invention does not limit the shape of the valve disc 1. Figure 3 The top view of the valve disc 1 shown in FIG is rectangular. The rotation axis 5 is set at the symmetrical axis position of the valve disc 1, that is, the valve disc 1 of the control valve is a split structure, and the valve disc 1 can be moved along the Figure 2 Rotate in the direction indicated by the arrow to close and open the valve plate 1.

[0087] In addition, it is worth mentioning that in an embodiment of the present invention, the pressure sensor 2 can be arranged at the edges of the valve plate 1 on both sides away from the rotating shaft 5, that is, when the valve plate 1 is in a closed state, the pressure sensor 2 is located at the position where the valve plate 1 contacts the control valve body or other valve plates 1. The advantage of such an arrangement is that the pressure sensor 2 can accurately detect the first pressure value, that is, the value of the pressure of the gas exerted on the valve plate 1, and can also accurately detect the second pressure value, that is, the value of the extrusion force exerted on the valve plate 1 during the closing process, thereby improving the accuracy of the pressure value detected by the pressure sensor 2 and thus improving the accuracy of the control valve for air volume control.

[0088] In addition, the embodiment of the present invention does not limit the number of pressure sensors 2, and the number can be set according to actual needs. Figure 3 The figure exemplarily shows that one valve plate 1 includes eight pressure sensors 2, but the actual arrangement is not limited thereto.

[0089] Optional, can still refer to Figure 2 and Figure 3 In an exemplary embodiment, the control valve further includes an actuator 6 electrically connected to the control box 3 and the rotating shaft 5, and configured to control the rotation of the rotating shaft 5 according to a control signal from the control box 3;

[0090] The control box 3 and the pressure sensor 2 and the actuator 6 are all electrically connected via the signal line 7 , wherein the signal line 7 is arranged inside the rotating shaft 5 and / or the valve plate 1 .

[0091] like Figure 2 and Figure 3 As shown, in an embodiment of the present invention, an actuator 6 can be provided. The actuator 6 is an action execution unit in the control valve. The actuator 6 is connected to the control box 3 and the rotating shaft 5. When it is necessary to control the rotation of the valve plate 1, the control box 3 can send a corresponding control signal to the actuator 6. The actuator 6 outputs torque according to the control signal to control the rotation of the rotating shaft 5, and the rotating shaft 5 drives the valve plate 1 to rotate.

[0092] Optionally, the embodiment of the present invention does not limit the setting position of the actuator 6. Those skilled in the art can set the position of the actuator 6 according to actual needs. Figure 2 The figure only shows an optional solution by way of example, and the actual setting method is not limited thereto.

[0093] In addition, you can continue to refer to Figure 3 The control valve provided in the embodiment of the present invention may further include a signal line 7, which is used to connect the control box 3 with the pressure sensor 2 and the actuator 6. The signal line 7 transmits various data information and control signals. For example, the control box 3 can send a control signal to the actuator 6 via the signal line 7 to control the rotation of the valve plate 1, and / or the pressure sensor 2 can send the collected pressure data to the control box 3 via the signal line 7, and the control box 3 performs the relevant calculations. Of course, if other components such as the angle sensor 4 are provided in the control valve, the angle sensor 4 and other components can also be connected to the control box 3 via the signal line 7.

[0094] in addition, Figure 4 A cross-sectional view of a valve plate provided in an embodiment of the present invention, such as Figure 4 As shown, in the embodiment of the present invention, the signal line 7 can be arranged inside the rotating shaft 5 and / or the valve disc 1, that is, the signal line 7 enters the rotating shaft 5 through the space assembled inside the valve disc 1, and is then transmitted to the control box 3 by the rotating shaft 5. Since the signal line 7 is in the internal space of the rotating shaft 5 and / or the valve disc 1, when the valve disc 1 rotates, the signal line 7 will not become tangled or deformed, thereby improving the stability of the signal line 7 when transmitting signals.

[0095] Optionally, in an exemplary embodiment, the pressure sensor 2 and the angle sensor 4 are integrated into the sensor module 8 .

[0096] Specifically, in an embodiment of the present invention, the pressure sensor 2 and the angle sensor 4 can be integrated into the same sensor module 8. Only the sensor module 8 needs to be set in the control valve to simultaneously detect the pressure borne by the valve plate 1 and the rotation angle of the valve plate 1. This can reduce the space occupied by the pressure sensor 2 and the angle sensor 4 on the control valve and simplify the process flow during installation.

[0097] Optionally, in an exemplary embodiment, the valve discs 1 include at least two, and the at least two valve discs 1 extend along the first direction X and are arranged along the second direction Y, and the first direction X intersects the second direction Y;

[0098] The rotating shaft 5 includes a main shaft 9 and at least one driven shaft 10 . At least one of the two valve plates 1 is connected to the main shaft 9 , and the remaining valve plates 1 are correspondingly connected to the driven shaft 10 . The main shaft 9 and the driven shaft 10 are connected by a connecting rod 11 .

[0099] Specifically, you can still refer to Figure 1 and Figure 2 In an embodiment of the present invention, the number of valve plates 1 can be set to at least 2, and at least two valve plates 1 extend along the first direction X and are arranged along the second direction Y, so that the control valve can be set to a multi-leaf split-door structure. The valve body size of the control valve of the multi-leaf split-door structure is shortened, which can save raw material costs and is conducive to the miniaturization application of the control valve.

[0100] Figure 1 and Figure 2 Schematically, three valve discs 1 are shown. The three valve discs 1 extend in a first direction X and are arranged along a second direction Y. The first direction X is perpendicular to the second direction Y.

[0101] Furthermore, since the valve control system includes multiple valve discs 1, each valve disc 1 should have a rotating shaft 5 that drives its rotation. In this case, the rotating shaft 5 can be set to include a main shaft 9 and a driven shaft 10. One valve disc 1 is connected to the main shaft 9, and the main shaft 9 can be connected to the actuator 6. The remaining valve discs 1 are connected to the driven shaft 10, and the main shaft 9 and the driven shaft 10 are connected by a connecting rod 11. When the control box 3 controls the rotation of the valve disc 1, the control box 3 can send a control signal to the actuator 6. The actuator 6 controls the rotation of the main shaft 9 according to the control signal, and then rotates the driven shaft 10 through the connecting rod 11. The advantage of this setting is that only the main shaft 9 can be set to be connected to the actuator 6, and there is no need to configure an actuator 6 for the rotating shaft 5 of each valve disc 1. While reducing the manufacturing cost, it improves the consistency of controlling the rotation of each valve disc 1. Figure 1 and Figure 2 The figure shows by way of example that the valve disc 1 at the bottom of the control valve body is connected to the main shaft 9, and the other two valve discs 1 are connected to the driven shaft 10. The actual setting is not limited to this.

[0102] An embodiment of the present invention further provides an oil fume exhaust system, comprising the control valve provided by any embodiment of the present invention. The oil fume exhaust system further comprises an oil fume exhaust pipe and a fan, and the control valve is arranged in the oil fume exhaust pipe.

[0103] The oil fume exhaust system provided by the embodiment of the present invention has all the technical features and corresponding beneficial effects of the control valve provided by any embodiment of the present invention, which will not be described in detail here.

[0104] Based on the same concept, an embodiment of the present invention further provides a control method for an oil fume exhaust system, which is applicable to the oil fume exhaust system provided by any embodiment of the present invention. Figure 5 A flow chart of a method for controlling an oil fume exhaust system provided by an embodiment of the present invention is shown in FIG. Figure 5 As shown, the control method includes:

[0105] S110 , obtaining a first pressure value borne by the valve plate 1 when the fan is running.

[0106] Among them, the pressure sensor 2 is used to detect the first pressure value that the valve plate 1 is subjected to when the fan is running and send the first pressure value to the control box 3. The control box 3 obtains the first pressure value that the valve plate 1 is subjected to in the exhaust fume duct when the fan is running. This first pressure value is the pressure exerted on the valve plate 1 by the gas in the exhaust fume duct when the fan is running.

[0107] S120: Calculate the current air volume in the oil fume exhaust duct according to the first pressure value.

[0108] Furthermore, the control box 3 calculates the current air volume in the exhaust duct according to the first pressure value. It is understandable that the valve plate 1 is subjected to different gas pressures at different rotation angles, and the air volume in the exhaust duct is also different.

[0109] S130 , feedback-controlling the valve plate 1 to rotate according to the current air volume in the oil fume exhaust duct until the air volume in the oil fume exhaust duct reaches a preset air volume.

[0110] Furthermore, the control box 3 can determine the current air volume and the preset air volume in the exhaust fume duct. If the control box 3 determines that the air volume in the exhaust fume duct is not equal to the preset air volume, the valve plate 1 will continue to be controlled to rotate until the air volume in the exhaust fume duct reaches the preset air volume, thereby realizing feedback adjustment of the rotation angle of the valve plate 1 and the air volume. When the air volume reaches the preset air volume, the valve plate 1 can be controlled to stop rotating and maintain the angle of the valve plate 1 to keep the ventilation volume of the valve port at the preset air volume.

[0111] In the embodiment of the present invention, by installing a pressure sensor 2 in the control valve, during the operation of the fan, the pressure sensor 2 can detect the first pressure value borne by the valve plate 1, that is, the pressure exerted on the valve plate 1 by the gas in the exhaust pipe when the fan is running; then the control box 3 calculates the current air volume in the exhaust pipe based on the first pressure value sent by the pressure sensor 2, and based on the current air volume in the exhaust pipe, feedback controls the rotation of the valve plate 1 so that the air volume passing through the control valve reaches the preset air volume, thereby realizing real-time monitoring and adjustment of the air volume. By using the pressure sensor 2 to detect the pressure and thus adjust the air volume of the control valve, even if the internal environment of the exhaust pipe changes, it will not affect the normal reading of the pressure value by the pressure sensor 2. The control valve can still adjust the air volume according to the value of the pressure sensor 2, and has a certain self-regulating function; in addition, the air volume can be calculated by the pressure value to achieve a higher accuracy, and it can also avoid the problem of low air volume adjustment accuracy caused by the error in the feedback voltage when the valve plate 1 angle is determined by analog voltage to control the air volume in the prior art.

[0112] Figure 6 This is a flowchart of another method for controlling an oil fume exhaust system provided by an embodiment of the present invention, referring to Figure 6 , the method comprising:

[0113] S210 , controlling the valve plate 1 to rotate from a first angle to an angle corresponding to a preset air volume.

[0114] The first angle is the angle at which the valve disc 1 is positioned when the control valve begins operating. It is understood that when the control valve is not operating, the valve disc 1 should be in a closed position. When the fume exhaust system is required to operate, the control box 3 can first control the valve disc 1 to rotate from the closed position to an angle corresponding to a preset air volume. That is, the valve disc 1 is controlled to rotate from the first angle to the angle corresponding to the preset air volume. The first angle is the angle at which the valve disc 1 is positioned when the control valve begins operating.

[0115] S220: Obtain the rotation angle of valve plate 1.

[0116] Specifically, an angle sensor 4 may be provided in the control valve. The angle sensor 4 detects the rotation angle of the valve disc 1 in real time and sends the detected rotation angle of the valve disc 1 to the control box 3 .

[0117] S230 , controlling the rotation of the valve disc 1 according to the feedback of the rotation angle of the valve disc 1 until the rotation angle of the valve disc 1 is equal to the angle difference between the angle corresponding to the preset air volume and the first angle.

[0118] Furthermore, the control box 3 determines whether the rotation angle of the valve plate 1 is equal to the angle difference between the angle corresponding to the preset air volume and the first angle, that is, the control box 3 determines whether the rotation angle of the valve plate 1 reaches the angle corresponding to the preset air volume. If the rotation angle of the valve plate 1 is not equal to the angle difference between the angle corresponding to the preset air volume and the first angle, the valve plate 1 continues to be controlled to rotate until the rotation angle of the valve plate 1 is equal to the angle difference between the angle corresponding to the preset air volume and the first angle.

[0119] S240: Obtain a first pressure value borne by the valve plate 1 when the fan is running.

[0120] S250: Calculate the current air volume in the oil fume exhaust duct according to the first pressure value.

[0121] S260: According to the current air volume in the oil fume exhaust duct, feedback control valve plate 1 rotates until the air volume in the oil fume exhaust duct reaches a preset air volume.

[0122] The specific implementation of the above steps is the same as in the above embodiment and will not be repeated here.

[0123] In an embodiment of the present invention, an angle sensor 4 is provided to detect the rotation angle of the valve disc 1. When the angle sensor 4 detects that the rotation angle of the valve disc 1 reaches the angle corresponding to the preset air volume, the fan operation is controlled. This solves the problem that in the prior art, when the rotation angle of the valve disc 1 is determined based on the analog voltage, after the valve disc 1 has been used for too long, due to the accumulation of oil and dirt and the end of the service life of the structural parts, the valve disc 1 still feeds back the analog voltage at the angle corresponding to the preset air volume when it has not reached the angle corresponding to the preset air volume, resulting in an air volume deviation. The rotation angle of the valve disc 1 can be accurately measured, thereby improving the accuracy of the control valve operation.

[0124] Optionally, in an exemplary embodiment, after feedback controlling the valve plate 1 to rotate according to the current air volume in the oil fume exhaust duct until the air volume in the oil fume exhaust duct reaches a preset air volume, the method further includes:

[0125] When a stop command is received, the control valve plate 1 rotates to a first angle;

[0126] Obtaining a second pressure value borne by the valve plate 1;

[0127] When the second pressure value remains zero for a predetermined period of time, a fault message is generated and uploaded to the cloud, and the valve plate 1 is controlled to stop rotating.

[0128] Specifically, when the fume exhaust system is no longer required, the master controller can shut down the fan and send a stop command to the control box 3. Upon receiving the stop command, the control box 3 controls the valve disc 1 to rotate back from a preset angle to the first angle, which is still the angle at which the valve disc 1 initially operated, thereby gradually closing the valve disc 1. During the gradual closing process, the valve disc 1 may collide with or be squeezed against the control valve body or adjacent valve discs 1. In this embodiment of the present invention, the pressure sensor 2 can also detect a second pressure value experienced by the valve disc 1, which represents the squeezing force experienced by the valve disc 1 during the closing process. It is understood that if the second pressure value detected by the pressure sensor 2 remains zero for a predetermined threshold time during the closing process, i.e., the pressure sensor 2 is inactive, indicating that the valve disc 1 did not contact the valve body or other valve discs 1 during closing, further indicating that the valve disc 1 failed to close properly. In this case, the control box 3 controls the valve disc 1 to stop rotating, determines that the control valve is faulty, generates fault information, and uploads it to the cloud. After receiving the fault information, maintenance personnel can inspect the control valve.

[0129] In an embodiment of the present invention, during the closing process of the control valve plate 1, if the second pressure value detected by the pressure sensor 2 remains zero within the preset threshold time, that is, the pressure sensor 2 detects that the valve plate 1 is not working normally, a fault message is generated and uploaded to the cloud, so that the staff can inspect and repair the control valve as soon as possible, avoiding the control valve from failing to complete its work normally for a long time, causing user dissatisfaction.

[0130] Optionally, in an exemplary embodiment, after obtaining the second pressure value borne by the valve plate 1 , the method further includes:

[0131] When the second pressure value gradually increases to the third pressure value and no longer changes, the control valve plate 1 stops rotating.

[0132] Specifically, during the normal closing process of the valve disc 1, due to the collision or extrusion between the valve disc 1 and the control valve body or the adjacent valve disc 1, the extrusion force received by the valve disc 1 gradually increases. When the second pressure value detected by the pressure sensor 2 gradually increases to the third pressure value and no longer changes, it indicates that the valve disc 1 has been completely closed. At this time, the control box 3 can control the valve disc 1 to stop rotating to prevent the valve disc 1 from continuing to rotate and causing damage to the valve disc 1 and / or the actuator 6.

[0133] Figure 7 This is a control logic diagram of an oil fume exhaust system provided by an embodiment of the present invention. Figure 7, the control logic of the control method provided by the embodiment of the present invention is introduced. When the oil fume exhaust system starts to run, the control box 3 of the control valve can first control the actuator 6 to operate, so as to control the valve plate 1 to rotate to the angle corresponding to the preset air volume, and then the angle sensor 4 detects whether the rotation angle of the valve plate 1 reaches the angle corresponding to the preset air volume. If so, the main controller can control the fan to operate; if not, the control box 3 continues to adjust the rotation angle of the valve plate 1 until the rotation angle reaches the angle corresponding to the preset air volume. Further, the pressure sensor 2 detects the first pressure value borne by the valve plate 1, and the control box 3 determines whether the air volume reaches the preset air volume. If so, the actuator 6 is controlled to stop running, and the valve plate 1 no longer rotates, maintaining the current rotation angle; if not, the actuator 6 is continued to be controlled to operate and adjust the rotation angle of the valve plate 1 until the air volume in the oil fume exhaust duct reaches the preset air volume.

[0134] Figure 8 Another control logic diagram of the fume exhaust system provided by the embodiment of the present invention is as follows: Figure 8 As shown, when the fume exhaust system is no longer needed, the master controller can send a stop command to the control box 3 and fan to shut down the fan and control valve. After the control valve receives the stop command, the control box 3 controls the actuator 6 to operate, closing valve 1. Pressure sensor 2 then detects the second pressure value experienced by valve 1. If pressure sensor 2 does not sense the pressure within a preset threshold time, the control box 3 controls the actuator 6 to close, preventing valve 1 from rotating. A fault message is generated and uploaded to the cloud. If pressure sensor 2 senses the pressure normally within the preset threshold time, the control box 3 continues to control the actuator 6 until valve 1 is fully closed.

[0135] Optionally, in an exemplary embodiment, calculating the current air volume in the oil fume exhaust duct according to the first pressure value includes:

[0136] Calculate the current static pressure value in the oil fume exhaust duct according to the first pressure value borne by the valve plate 1;

[0137] The current air volume in the exhaust duct is obtained according to the current static pressure value in the exhaust duct.

[0138] Specifically, during the operation of the fan, the valve plate 1 will add different resistances to the exhaust pipe at different rotation angles. In the embodiment of the present invention, the first pressure value F detected by the pressure sensor 2 is sent to the control box 3, and the control box 3 calculates the pressure loss P of the valve plate 1 at this time. 损 , specifically, P 损 =F / S, where S is the valve port area of the control valve. S can be calculated based on the rotation angle of the valve plate 1. The pressure loss of the valve plate 1 is P 损 and the preset pipeline pressure loss P 预The sum is the static pressure value P in the exhaust duct; and during the operation of the fan, if the operating frequency is fixed, the relationship between its static pressure value P and air volume Q is certain, that is, its PQ curve is fixed, and the corresponding current air volume Q can be determined according to the current static pressure value P.

[0139] The current static pressure value P in the exhaust fume duct is calculated according to the first pressure value, and then the current air volume Q is determined according to the PQ curve. The calculation process is very simple and the result is relatively accurate, which is conducive to further improving the accuracy of the control valve operation.

[0140] In addition, as described in the above embodiment, if the calculated current air volume Q is not equal to the preset air volume, the rotation angle of the valve plate 1 can continue to be adjusted, and the angle sensor 4 can also detect the rotation angle of the valve plate 1 in real time, so that the valve plate 1 rotates to the angle corresponding to the preset air volume. It can be understood that when the rotation angle of the valve plate 1 changes, the above calculation process can be repeated until the current air volume Q is equal to the preset air volume.

[0141] Note that the above are only preferred embodiments of the present invention and the technical principles employed. Those skilled in the art will appreciate that the present invention is not limited to the specific embodiments herein, and that various obvious changes, readjustments, combinations, and substitutions are possible for those skilled in the art without departing from the scope of protection of the present invention. Therefore, although the present invention has been described in detail through the above embodiments, the present invention is not limited to the above embodiments and may include many other equivalent embodiments without departing from the scope of the present invention. The scope of the present invention is determined by the scope of the appended claims.

Claims

1. A control valve is used in an oil fume exhaust system, wherein the oil fume exhaust system further comprises a fan and an oil fume exhaust pipe, and the control valve is arranged in the oil fume exhaust pipe, characterized in that: The control valve comprises: Valve plate (1); A rotating shaft (5), the rotating shaft (5) being connected to the valve plate (1) and being used to drive the valve plate (1) to rotate; A pressure sensor (2) is used to detect a first pressure value borne by the valve plate when the fan is running and to send the first pressure value to a control box (3); A control box (3) is used to calculate the current air volume in the exhaust duct according to the first pressure value, and feedback-control the rotation of the valve plate (1) according to the current air volume in the exhaust duct until the air volume in the exhaust duct reaches a preset air volume; The control box (3) is further used to control the valve plate (1) to rotate to a first angle after receiving a stop command; wherein the first angle is the angle of the valve plate (1) when the control valve starts to operate; The pressure sensor (2) is further used to detect a second pressure value borne by the valve plate (1) and send the second pressure value to the control box (3); The control box (3) is further configured to generate fault information and upload it to the cloud when the second pressure value remains zero for a predetermined threshold time, and simultaneously control the valve plate (1) to stop rotating.

2. The control valve according to claim 1, characterized in that It also includes an angle sensor (4), which is used to detect the rotation angle of the valve plate (1) and send the rotation angle to the control box (3); The control box (3) is further used to control the valve plate (1) to rotate from the first angle to the angle corresponding to the preset air volume; The control box (3) is further used to control the rotation of the valve disc (1) according to feedback of the rotation angle of the valve disc (1), until the rotation angle of the valve disc (1) is equal to the angle difference between the angle corresponding to the preset air volume and the first angle.

3. The control valve according to claim 2, characterized in that The control box (3) is further used to control the valve plate (1) to stop rotating when the second pressure value gradually increases to a third pressure value and no longer changes.

4. The control valve according to claim 1, wherein: The control box (3) is further used to calculate the current static pressure value in the oil fume exhaust duct according to the first pressure value borne by the valve plate (1); and to obtain the current air volume in the oil fume exhaust duct according to the current static pressure value in the oil fume exhaust duct.

5. The control valve according to claim 1, wherein: The rotation axis (5) is arranged at the symmetry axis position of the valve plate (1), and the pressure sensor (2) is arranged at the two side edges of the valve plate (1) away from the rotation axis (5).

6. The control valve according to claim 5, characterized in that Also includes: an actuator (6) electrically connected to the control box (3) and the rotating shaft (5), and configured to control the rotation of the rotating shaft (5) according to a control signal from the control box (3); A signal line (7), wherein the control box (3) is electrically connected to the pressure sensor (2) and the actuator (6) via the signal line (7), wherein the signal line (7) is arranged inside the rotating shaft (5) and / or the valve plate (1).

7. The control valve according to claim 2, wherein: The pressure sensor (2) and the angle sensor (4) are integrated into a sensor module (8).

8. The control valve according to claim 6, characterized in that The valve sheets (1) include at least two, and the at least two valve sheets (1) extend along a first direction and are arranged along a second direction, and the first direction intersects with the second direction; The rotating shaft (5) includes a main shaft (9) and at least one driven shaft (10), one of at least two valve plates (1) is connected to the main shaft (9), and the remaining valve plates (1) are correspondingly connected to the driven shaft (10), and the main shaft (9) and the driven shaft (10) are connected via a connecting rod (11).

9. A fume exhaust system, characterized in that: The oil fume exhaust system comprises the control valve according to any one of claims 1 to 8, and further comprises an oil fume exhaust pipe and a fan, wherein the control valve is arranged in the oil fume exhaust pipe.

10. A method for controlling an oil fume exhaust system, applied to the oil fume exhaust system of claim 9, characterized in that: include: Obtaining a first pressure value borne by the valve plate (1) when the fan is running; Calculating the current air volume in the exhaust fume duct according to the first pressure value; Feedback controlling the valve plate (1) to rotate according to the current air volume in the fume exhaust duct until the air volume in the fume exhaust duct reaches a preset air volume; After feedback controlling the rotation of the valve plate (1) according to the current air volume in the oil fume exhaust duct until the air volume in the oil fume exhaust duct reaches a preset air volume, the method further comprises: When a stop command is received, the valve disc (1) is controlled to rotate to the first angle; wherein the first angle is the angle of the valve disc (1) when the control valve starts to operate; Obtaining a second pressure value borne by the valve plate (1); When the second pressure value remains zero for a period of time equal to a preset threshold, fault information is generated and uploaded to the cloud, and the valve plate (1) is controlled to stop rotating.

11. The control method according to claim 10, characterized in that: Before obtaining the first pressure value borne by the valve plate (1) when the fan is running, the method further includes: Controlling the valve plate (1) to rotate from the first angle to an angle corresponding to the preset air volume; Obtaining the rotation angle of the valve plate (1); The valve disc (1) is controlled to rotate according to feedback of the rotation angle of the valve disc (1) until the rotation angle of the valve disc (1) is equal to the angle difference between the angle corresponding to the preset air volume and the first angle.

12. The control method according to claim 11, characterized in that: After obtaining the second pressure value borne by the valve plate (1), the method further comprises: When the second pressure value gradually increases to a third pressure value and no longer changes, the valve plate (1) is controlled to stop rotating.

13. The control method according to claim 10, characterized in that: Calculating the current air volume in the oil fume exhaust duct according to the first pressure value includes: Calculating a current static pressure value in the oil fume exhaust duct according to a first pressure value borne by the valve plate (1); The current air volume in the oil fume exhaust duct is obtained according to the current static pressure value in the oil fume exhaust duct.

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