Safety-level high-precision air volume control valve

Abstract

The safety-level high-precision air volume control valve comprises a valve body assembly, the valve body assembly comprises a frame, blades, a rotating shaft and a driving structure, the frame is hollow to form a cavity, openings are formed in the two sides of the cavity in the first direction respectively, the rotating shaft extends in the second direction, the blades are connected into the cavity through the rotating shaft, and the driving structure is in driving connection with the rotating shaft; the second direction is perpendicular to the first direction; the flow measuring assembly comprises a flow measuring frame and a flow measuring element, the flow measuring frame is hollow to form a flow measuring cavity, the flow measuring frame is connected with one side face of the frame, the flow measuring cavity is communicated with the cavity, the flow measuring element is arranged in the flow measuring cavity and used for obtaining airflow parameter information of the flow measuring cavity, and the flow measuring element is electrically connected with the driving structure; the driving structure is configured to control the rotating shaft to drive the blades to rotate according to airflow parameter information acquired by the flow measuring element. High-precision control and adjustment of the air volume can be achieved.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of nuclear power ventilation systems, and particularly relates to a safety level high-precision air volume control valve. BACKGROUND

[0002] Nuclear facilities have extremely strict requirements for ventilation systems, and stable operation of the ventilation and air conditioning system not only relates to air quality and temperature and humidity control inside the facility, but also is a key link to ensure nuclear safety barriers. The air volume regulating equipment in the traditional ventilation and air conditioning system has been difficult to meet the high standard demand of modern nuclear facilities in terms of precision, reliability and nuclear safety guarantee capacity, so the research and application of the safety level high-precision air volume control valve are imminent. SUMMARY

[0003] The present application aims at at least solving one of the problems in the prior art. To this end, the present application provides a safety level high-precision air volume control valve.

[0004] The solution to the technical problem of the present application is as follows: A safety level high-precision air volume control valve comprises: A valve body assembly comprises a frame, a blade, a rotating shaft and a driving structure, the frame is hollow to form a cavity, the cavity is open on both sides along a first direction, the rotating shaft extends along a second direction, the blade is connected to the cavity through the rotating shaft, the driving structure is drivingly connected with the rotating shaft, and the second direction and the first direction are perpendicular to each other. A flow measurement assembly comprises a flow measurement frame and a flow measurement element, the flow measurement frame is hollow to form a flow measurement cavity, the flow measurement frame is connected with one side of the frame, the flow measurement cavity is in communication with the cavity, the flow measurement element is arranged in the flow measurement cavity and is used to obtain airflow parameter information of the flow measurement cavity, and the flow measurement element is electrically connected with the driving structure. The driving structure is configured to control the rotating shaft to drive the blade to rotate according to the airflow parameter information obtained by the flow measurement element.

[0005] The present application has at least the following beneficial effects: the driving structure controls the rotating shaft to rotate according to the airflow parameter information obtained by the flow measurement element, and drives the blade to rotate, so as to adjust the angle of the blade and achieve the effect of high-precision control of air volume.

[0006] As a further improvement of the above technical solution, the flow measuring element is provided with a windward surface away from one side of the frame, the windward surface is a convex circular arc surface towards the side away from the frame, the flow measuring element is provided with a total pressure pipe and a static pressure pipe extending along the second direction, the windward surface is provided with a total pressure measuring hole extending along the first direction, the total pressure measuring hole is in communication with the total pressure pipe, the flow measuring element is further provided with a static pressure measuring hole penetrating the flow measuring element along the up-down direction, the static pressure measuring hole is in communication with the static pressure pipe, and the first direction and the second direction are perpendicular to the up-down direction.

[0007] As a further improvement of the above technical solution, the flow measuring assembly further comprises a flow rectifying grid connected to the side of the flow measuring frame away from the frame, the flow rectifying grid is provided with a plurality of flow rectifying holes penetrating the flow rectifying grid along the first direction and in communication with the flow measuring cavity.

[0008] As a further improvement of the above technical solution, the flow measuring assembly further comprises a flow measuring rod extending along the second direction and connected to the inner wall of the flow measuring cavity, the flow measuring rod is provided with a flow measuring hole penetrating the flow measuring rod along the first direction, the flow measuring hole is surrounded by four curved surfaces, and the two opposite curved surfaces are arranged to protrude towards each other, the flow measuring rod corresponds to two flow measuring elements, and the two flow measuring elements are respectively connected to the two opposite curved surfaces.

[0009] As a further improvement of the above technical solution, the frame comprises two valve seats and two side sealing pieces, the two valve seats are respectively arranged to extend along the second direction, and the two side sealing pieces are respectively arranged to extend along the up-down direction, one of the valve seats is connected to the upper ends of the two side sealing pieces, the other valve seat is connected to the lower ends of the two side sealing pieces, the two valve seats and the two side sealing pieces together form the cavity, the two ends of the shaft along the second direction are respectively connected to the two side sealing pieces, and the side walls of the two valve seats and the two side sealing pieces forming the cavity are all arc surfaces protruding towards the middle part of the cavity.

[0010] As a further improvement of the above technical solution, the valve seat comprises a pressing seat and an arc plate, the pressing seat comprises a bottom plate and two pressing plates, the bottom plate is arranged to extend along the second direction, the two pressing plates are respectively arranged at the two ends of the bottom plate along the first direction and form an acute angle with the bottom plate, the bottom plate and the two pressing plates together form a mounting cavity facing the opening of the cavity, and the arc plate is connected to the mounting cavity and arranged to protrude towards the middle part of the cavity.

[0011] As a further improvement of the above technical solution, the bottom plate and the two pressing plates are integrally formed or separately formed.

[0012] As a further improvement of the above technical solution, the valve body assembly further comprises a linkage structure, the vane is provided with a plurality of pieces, the vanes are arranged in an up-down direction, a plurality of shafts are correspondingly provided, each of the shafts is connected with the linkage structure, the driving structure is drivingly connected with one of the shafts to drive the shaft to rotate, the rotation directions of two adjacent vanes are opposite, and the two adjacent vanes abut when the vanes rotate to a vertical state.

[0013] As a further improvement of the above technical solution, the vane comprises a vane piece and a spring sealing piece, one end of the vane piece is provided with a sealing groove, the spring sealing piece is connected in the sealing groove, the other end of the vane piece is provided with an abutting portion, and the abutting portion of the vane piece enters the sealing groove of the adjacent vane piece and abuts against the spring sealing piece when the vane rotates to a vertical state.

[0014] As a further improvement of the above technical solution, the vane piece is an integrally formed piece; or the vane piece comprises two piece bodies, the two piece bodies are connected with each other and form the sealing groove and the abutting portion. BRIEF DESCRIPTION OF DRAWINGS

[0015] In order to more clearly illustrate the technical solutions in the embodiments of the present application, the drawings needed in the embodiment description will be briefly described below. Obviously, the described drawings are only a part of the embodiments of the present application, and not all the embodiments, and those skilled in the art can obtain other design schemes and drawings according to these drawings without creative labor.

[0016] Figure 1 is a schematic view of the overall structure of a safety level high precision air volume control valve according to an embodiment of the present application; Figure 2 is a rear view of a safety level high precision air volume control valve according to an embodiment of the present application; Figure 3 is a sectional view in the A-A direction of Figure 2 Figure 4 is a sectional view of a safety level high precision air volume control valve according to another embodiment of the present application; Figure 5 is a schematic view of the structure of a rectifier grid according to an embodiment of the present application; Figure 6 is a schematic view of the structure of a rectifier grid according to another embodiment of the present application; Figure 7 is a schematic view of the structure of an integrally formed flow measuring element according to an embodiment of the present application; Figure 8 is a schematic view of the structure of an integrally formed flow measuring element according to another embodiment of the present application; Figure 9 ​is a structural schematic diagram of a flow measuring element formed by welding of an embodiment of the present application; Figure 10 is a structural schematic diagram of a flow measuring element formed by single-piece sheet metal cold forming of an embodiment of the present application; Figure 11 is a structural schematic diagram of a flow measuring rod of an embodiment of the present application; Figure 12 is a sectional view of a flow measuring rod of an embodiment of the present application; Figure 13 is a structural schematic diagram of a side sealing piece of an embodiment of the present application; Figure 14 is a structural schematic diagram of a valve seat of an embodiment of the present application; Figure 15 is a structural schematic diagram of a valve seat of another embodiment of the present application; Figure 16 is a structural schematic diagram of a one-piece blade of an embodiment of the present application; Figure 17 is a structural schematic diagram of a one-piece blade of another embodiment of the present application; Figure 18 is a structural schematic diagram of a split blade of an embodiment of the present application; Figure 19 is a structural schematic diagram of a split blade of another embodiment of the present application; Figure 20 is a structural schematic diagram of a blade with flush end faces of an embodiment of the present application; Figure 21 is a structural schematic diagram of a blade with flush end faces of another embodiment of the present application; Figure 22 is a structural schematic diagram of a spring sealing piece of an embodiment of the present application applied to Figure 16 ; Figure 23 is a structural schematic diagram of a spring sealing piece of another embodiment of the present application applied to Figure 17 ; Figure 24 is a structural schematic diagram of a spring sealing piece of another embodiment of the present application applied to Figure 18 ; Figure 25 is a structural schematic diagram of a spring sealing piece of another embodiment of the present application applied to Figure 19 .

[0017] Reference signs: 100, valve body assembly; 110, frame; 111, valve seat; 112, side sealing piece; 113, bottom plate; 114, pressing plate; 115, arc-shaped plate; 120, blade; 121, blade piece; 122, spring sealing piece; 1221, connecting portion; 1222, sealing portion; 130, driving structure; 140, rotating shaft; 200, flow measuring assembly; 210, flow measuring frame; 220, flow measuring element; 221, windward face; 222, total pressure pipeline; 223, static pressure pipeline; 224, total pressure measuring hole; 225, static pressure measuring hole; 230, fairing; 231, fairing hole; 240, flow measuring rod; 241, flow measuring hole. DETAILED DESCRIPTION

[0018] Embodiments of the present application will be described in detail below with reference to the drawings, in which like reference numerals refer to like elements or elements having the same function throughout the description of the drawings. The embodiments described below with reference to the drawings are exemplary and are for the purpose of explaining the present application only and are not to be understood as limiting the present application.

[0019] In the description of the present application, the orientation description such as the orientation or position relationship indicated by up, down, front, back, left, right, etc. is based on the orientation or position relationship shown in the drawings and is only for the purpose of facilitating the description of the present application and simplifying the description and is not to indicate or imply that the device or element referred to must have a particular orientation, be constructed and operated in a particular orientation, and therefore cannot be understood as limiting the present application.

[0020] In the description of the present application, the meaning of several is one or more and the meaning of multiple is two or more, greater than, less than, more than, etc. are understood as not including the number, above, below, etc. are understood as including the number. If it is described as first, second, etc., it is only for the purpose of distinguishing technical features and cannot be understood as indicating or implying relative importance or implicitly indicating the number of technical features indicated or the sequence of technical features indicated.

[0021] In the description of the present application, unless otherwise explicitly limited, the words such as setting, mounting, connecting, etc. should be broadly understood, and those skilled in the art can reasonably determine the specific meaning of the above words in the present application in combination with the specific content of the technical solution.

[0022] Obviously, the described embodiments are only some of the embodiments of the present application, not all the embodiments, and other embodiments obtained by those skilled in the art based on the embodiments of the present application without creative labor are within the scope of protection of the present application. The various technical features in the present application can be combined with each other without conflict, provided that they do not conflict with each other.

[0023] Reference Figures 1 to 25 The embodiment of the present application proposes a safety level high precision air volume control valve, which comprises a valve body assembly 100 and a flow measuring assembly 200, and can realize high precision control and adjustment of air volume.

[0024] In the embodiment, the valve body assembly 100 comprises a frame 110, a vane 120, a rotating shaft 140 and a driving structure 130. The frame 110 is hollow to form a cavity, the cavity is open on both sides along a first direction, the rotating shaft 140 extends along a second direction, the vane 120 is connected in the cavity through the rotating shaft 140, and the driving structure 130 is drivingly connected with the rotating shaft 140, for driving the rotating shaft 140 to rotate the vane 120, so as to realize the communication or closed separation of the openings on both sides of the cavity. The flow measurement assembly 200 comprises a flow measurement frame 210 and a flow measurement element 220. The flow measurement frame 210 is hollow to form a flow measurement cavity, the flow measurement frame 210 is connected with a side surface of the frame 110, the flow measurement cavity is communicated with the cavity through the opening on one side of the cavity, the flow measurement element 220 is arranged in the flow measurement cavity, for obtaining the airflow parameter information in the flow measurement cavity, and the flow measurement element 220 is electrically connected with the driving structure 130.

[0025] It can be understood that the first direction and the second direction are perpendicular to each other. For the convenience of description, the front-rear direction is taken as the first direction, and the left-right direction is taken as the second direction. The flow measurement assembly 200 is arranged on the front side of the valve body assembly 100, that is, the flow measurement frame 210 is connected with the front end surface of the frame 110.

[0026] In the embodiment, the driving structure 130 controls the rotating shaft 140 to rotate according to the airflow parameter information obtained by the flow measurement element 220, and drives the vane 120 to rotate, so as to adjust the angle of the vane 120, thereby achieving the effect of high-precision control of the air volume.

[0027] In some embodiments, the airflow parameter information comprises airflow dynamic change, total pressure information and static pressure information of the airflow.

[0028] In some embodiments, with reference to Figure 3 、 Figures 7 to 10 The flow measurement element 220 is a flow sensor, a windward surface 221 is arranged on the side of the flow measurement element 220 away from the frame 110, that is, the front end of the flow measurement element 220 is provided with the windward surface 221, the windward surface 221 is a circular arc surface arranged forwardly protruding, the flow measurement element 220 is provided with a total pressure pipeline 222 and a static pressure pipeline 223 extending along the left-right direction, the windward surface 221 is provided with a total pressure measuring hole 224 extending along the front-rear direction, the rear end of the total pressure measuring hole 224 is communicated with the total pressure pipeline 222, and the flow measurement element 220 is further provided with a static pressure measuring hole 225 extending along the up-down direction, the static pressure measuring hole 225 penetrates the upper and lower wall surfaces of the flow measurement element 220 and is communicated with the static pressure pipeline 223.

[0029] It can be understood that the windward surface 221 is designed as a circular arc surface, which can better adapt to the flow direction of the airflow, reduce the impact of the airflow on the sensor, reduce the flow resistance, and at the same time make the airflow flow more uniformly through the surface of the flow measurement element 220, thereby improving the accuracy of pressure measurement at the total pressure measuring hole 224 and the static pressure measuring hole 225.

[0030] The flow sensor can be integrally formed by cold drawing or rolling, extrusion molding, referring to Figures 7 to 10 Different shapes of flow sensors perform differently in terms of air flow distribution, pressure capture accuracy, and flow resistance. In some embodiments, the flow sensor is integrally formed by a mold, referring to Figure 7 and Figure 8 , wherein, as shown in Figure 8 , the leeward surface (i.e. the rear end surface) of the flow sensor can be provided with a streamlined structure, and the upper and lower surfaces of the rear end of the flow sensor gradually approach each other from front to back, which can further reduce the flow resistance. In other embodiments, referring to Figure 9 , the flow sensor is formed by welding a profile, which is specifically divided into two parts, the front part where the full pressure hole 224 and the full pressure pipeline 222 are located, and the rear part where the static pressure hole 225 and the static pressure pipeline 223 are located, and the front part and the rear part are connected by welding. In other embodiments, referring to Figure 10 , the flow sensor is integrally formed by cold forming a single piece of sheet metal, and the front part with the full pressure pipeline 222 and the rear part with the static pressure pipeline 223 are formed by bending a single piece of sheet metal.

[0031] Further, the flow measurement assembly 200 further comprises a flow straightener 230, referring to Figure 2 and Figure 3 , Figure 3 , wherein the arrow indicates the direction of the airflow, the flow straightener 230 is connected to the front side of the flow measurement frame 210, referring to Figure 5 and Figure 6 , the flow straightener 230 is provided with a plurality of flow straightening holes 231, the flow straightening holes 231 penetrate the flow straightener 230 in the front-rear direction and communicate with the flow measurement cavity. It can be understood that the flow straightener 230 can preliminarily arrange the airflow entering the flow measurement section, reduce the turbulence degree of the airflow, and make the airflow more uniform and stable, thereby improving the accuracy of subsequent flow sensor measurement. Through the combination of the flow straightener 230 and the flow sensor, the airflow is more fully arranged and measured, which can provide more comprehensive airflow parameter information.

[0032] It can be understood that the flow straightening holes 231 on the flow straightener 230 are provided in multiple numbers, and the multiple flow straightening holes 231 are arranged in a matrix on the flow straightener 230.

[0033] It can be understood that the shape of the flow straightening hole 231 can be circular, quadrilateral, hexagonal, etc. The circular flow straightening hole 231 has smaller resistance to airflow, allowing the airflow to pass more smoothly. Referring to Figure 5 , the quadrilateral flow straightening hole 231 has stronger airflow constraint, which can more effectively change the direction and velocity distribution of the airflow, making the airflow more uniform. Referring to Figure 6The hexagonal rectifying hole 231 combines the features of the circular rectifying hole 231 and the quadrilateral rectifying hole 231, and balances the rectifying effect and the flow resistance, so that the flow resistance is relatively small while the rectifying effect is good.

[0034] In some embodiments, the flow measurement assembly 200 further comprises a flow measurement rod 240, which is arranged along the left-right direction and connected with the inner wall of the flow measurement cavity. Figure 4 、 Figure 11 and Figure 12 The flow measurement rod 240 is provided with a flow measurement hole 241, which penetrates the flow measurement rod 240 along the front-back direction. The left and right side walls of the flow measurement hole 241 are respectively connected with a flow measurement element 220. Specifically, the flow measurement element 220 is a sensor, and the flow measurement hole 241 is surrounded by four curved surfaces. The upper wall of the flow measurement hole 241 is arranged downwardly protruding, the lower wall of the flow measurement hole 241 is arranged upwardly protruding, the left wall of the flow measurement hole 241 is arranged rightwardly protruding, and the right wall of the flow measurement hole 241 is arranged leftwardly protruding.

[0035] It can be understood that the design of the four curved surfaces can guide the airflow into the flow measurement hole 241 from multiple directions, so that the flow measurement hole 241 can more comprehensively perceive the dynamic changes of the airflow. Even when the airflow is turbulent to a certain extent, for example, when the angle between the airflow direction and the longitudinal axis of the flow measurement element 220 is α°, the measurement deviation can be reduced, the measurement accuracy can be improved, and the measurement value can be ensured to be within a high-precision range. Figure 12 The arrow direction indicates the airflow direction.

[0036] In some embodiments, the flow measurement rod 240 is arranged in multiple, and the multiple flow measurement rods 240 are arranged in the flow measurement cavity along the up-down direction. The structure is relatively simple, the cost is low, and the layout of the flow measurement rod 240 is flexible, which can adapt to different airflow distribution to a certain extent.

[0037] In some embodiments, referring to Figure 3 and Figure 4 The frame 110 comprises two valve seats 111 and two side sealing sheets 112. The two valve seats 111 are respectively arranged along the left-right direction, and the two side sealing sheets 112 are respectively arranged along the up-down direction. One valve seat 111 is connected with the upper ends of the two side sealing sheets 112, and the other valve seat 111 is connected with the lower ends of the two side sealing sheets 112. The two valve seats 111 and the two side sealing sheets 112 jointly form a cavity.

[0038] It can be understood that, referring to Figure 13 The side sealing sheet 112 is provided with a mounting hole, and the bearing is arranged in the mounting hole. The left and right ends of the rotating shaft 140 are respectively connected with the side sealing sheets 112 through the bearings. It can be understood that the mounting hole can limit the sliding of the rotating shaft 140.

[0039] It is worth noting that the side walls of the cavities formed in the valve seat 111 and the side sealing piece 112 are arc surfaces protruding towards the middle of the cavities, so as to reduce the flow resistance and enhance the sealing performance. In the embodiment, the protruding side sealing piece 112 is pressed by the vane 120 when the vane 120 rotates, so as to realize sealing and ensure the lateral sealing performance of the vane 120 when the vane 120 is closed. When the vane 120 is closed, the axial end of the vane 120 directly presses the upper and lower valve seats 111 to form a seal, thereby ensuring the axial sealing performance of the vane 120 when the vane 120 is closed.

[0040] It can be understood that the valve seat 111 and the side sealing piece 112 can be detachably connected through a connecting member such as a screw.

[0041] In some embodiments, referring to Figure 14 and Figure 15 , the valve seat 111 includes a pressing seat and an arc plate 115. The pressing seat includes a bottom plate 113 and two pressing plates 114. The bottom plate 113 extends in the left-right direction. The two pressing plates 114 are respectively arranged at the front and rear ends of the bottom plate 113 and form an acute angle with the bottom plate 113. The bottom plate 113 and the two pressing plates 114 jointly form mounting cavities. The mounting cavity located on the lower side of the cavity is upwardly open. The mounting cavity located on the upper side of the cavity is downwardly open. The arc plate 115 is installed at the mounting cavities. The front end and the rear end of the arc plate 115 are pressed by the two pressing plates 114. The middle part of the arc plate 115 protrudes towards the middle of the cavity. That is, the arc plate 115 located on the lower side of the cavity bulges upwards, and the arc plate 115 located on the upper side of the cavity bulges downwards.

[0042] In this way, the arc plate 115 is pressed by the pressing plate 114. The position of the pressing plate 114 can limit the straight-line distance between the front and rear ends of the arc plate 115, so as to limit the arc angle and the protruding height of the arc plate 115. When the vane 120 is closed, the upper and lower ends of the vane 120 can respectively abut against the arc plates 115 of the two valve seats 111 and form a good seal, thereby improving the safety performance.

[0043] In some embodiments, the bottom plate 113 and the two pressing plates 114 are integrally formed, referring to Figure 14 The integrally formed valve seat 111 has good integrity and uniform sealing, which can effectively prevent gas leakage and is suitable for occasions with extremely high sealing performance requirements.

[0044] In other embodiments, the bottom plate 113 and the two pressing plates 114 are separately formed, referring to Figure 15The pressing plate 114 and the bottom plate 113 are connected by welding, bolts or the like. The split valve seat 111 has simple manufacturing process, convenient processing, low cost, and is easy to install and maintain, and is suitable for application scenarios with high cost control requirements and moderate sealing performance requirements, such as general industrial ventilation systems.

[0045] In some embodiments, the valve body assembly 100 further comprises a linkage structure, the vane 120 is provided with multiple pieces, the vanes 120 are arranged in the up-down direction, and the rotating shaft 140 is correspondingly provided with multiple pieces, each rotating shaft 140 is connected with the linkage structure, and the driving structure 130 is drivingly connected with one of the rotating shafts 140. It can be understood that the linkage structure can be a gear set, a connecting rod mechanism, a belt wheel, or the like.

[0046] When the driving structure 130 drives one of the rotating shafts 140 to rotate, the other rotating shafts 140 also rotate under the driving action of the linkage structure, that is, the multiple vanes 120 rotate. In this embodiment, the rotation directions of the adjacent two vanes 120 are opposite, when the vane 120 rotates to the vertical state, the adjacent two vanes 120 abut, and all the vanes 120 are sequentially connected to form a seal to the cavity, at this time, the high-safety high-precision air volume control valve is in a closed state.

[0047] It can be understood that in this way, the rotation of the vanes 120 will not interfere with each other, and in the closed state, the mutual abutment of the vanes 120 can further improve the sealing performance of the high-safety high-precision air volume control valve, and further improve its reliability.

[0048] In some embodiments, referring to Figures 16 to 19 The vane 120 comprises a vane piece 121 and a spring sealing piece 122, one end of the vane piece 121 is provided with a sealing groove, the spring sealing piece 122 is connected in the sealing groove, and the other end of the vane piece 121 is provided with an abutting portion. When the vane 120 rotates to the vertical state, the abutting portion of the vane piece 121 enters the sealing groove of the adjacent vane piece 121 and abuts against the spring sealing piece 122 in the sealing groove. Under the action of the spring sealing piece 122, the connection sealing performance between the two vanes 120 is greatly improved.

[0049] It can be understood that in order to further avoid the interference of the rotation between the adjacent two vanes 120, one side wall of the sealing groove has a notch, so that the length of the side wall is shorter than that of the other side wall, and the elastic sealing piece is connected with the side wall with longer length.

[0050] In some embodiments, the vane piece 121 is integral, referring to Figure 16 and Figure 17, the leaf-shaped piece 121 is integrally formed, and the abutting portion is formed in a streamline shape, so that pressure loss is greatly reduced.

[0051] It can be understood that the abutting portion of the integrally formed leaf-shaped piece 121 is formed in a streamline shape, which can greatly reduce pressure loss.

[0052] It can be understood that the cross section of the rotating shaft 140 installed in the mounting groove can be polygonal or circular.

[0053] Referring to Figure 16 and Figure 22 , the sealing groove is located at the lower end of the leaf-shaped piece 121, and the abutting portion is located at the upper end of the leaf-shaped piece 121. The rear wall surface of the sealing groove is provided with a notch, the part of the elastic sealing piece connected with the front wall surface of the sealing groove is the connecting portion 1221, the elastic sealing piece is bent back at one end of the opening of the sealing groove to form a sealing portion 1222, and an included angle is formed between the sealing portion 1222 and the connecting portion 1221. During the process of rotating the blade 120 to the vertical state, the abutting portion of the blade 120 located below enters the sealing groove through the position of the notch, and abuts against the sealing portion 1222 of the elastic sealing piece. The included angle between the sealing portion 1222 and the connecting portion 1221 of the elastic sealing piece becomes smaller, until the blade 120 is rotated to the vertical state, the sealing portion 1222 provides a backward pressure to the abutting portion, so as to achieve good sealing performance.

[0054] In some embodiments, referring to Figure 17 and Figure 23 , the connecting portion 1221 of the elastic sealing piece has two sections, and the sealing portion 1222 is curved in an arc shape and located between the two connecting portions 1221. The connecting portion 1221 and the sealing portion 1222 are integrally formed, and the two connecting portions 1221 are inserted into the positions between the front and rear wall surfaces of the sealing groove. During the process of rotating the blade 120 to the vertical state, the abutting portion of the blade 120 located below enters the sealing groove through the position of the notch, and presses the arc-shaped sealing portion 1222, so that the sealing portion 1222 is deformed. The sealing portion 1222 provides a backward pressure to the abutting portion, so as to achieve good sealing performance.

[0055] In other embodiments, referring to Figure 18 and Figure 19, the leaf-shaped piece 121 is split, including two piece bodies, the two piece bodies are connected to each other and jointly form a sealing groove and an abutting portion. In some embodiments, the two piece bodies are identical in shape, and the two piece bodies are connected by bolting, riveting, punch riveting or welding after being overlapped. The connecting portion 1221 of the spring sealing piece 122 is clamped between the two piece bodies and is fixed by bolting, riveting, punch riveting or welding. The manufacturing process of this structure is relatively simple, the cost is relatively low, and the maintenance and replacement are easy, and therefore, the leaf-shaped piece 121 is more advantageous for general industrial ventilation systems or occasions with high requirements for cost control.

[0056] With reference to Figure 18 and Figure 24 , the two piece bodies are formed by sheet metal cold forming and are provided with a protruding portion, a hooked portion and an extension portion. After the two piece bodies are overlapped, the two protruding portions are arranged back to back, and a mounting groove for mounting the rotating shaft 140 is formed between the two protruding portions. The hooked portion of one piece body and the extension portion of the other piece body jointly form an abutting portion or a sealing groove. An elastic sealing piece is mounted on one side of the sealing groove. The connecting portion 1221 of the elastic sealing piece is clamped by the two piece bodies and is connected to the extension portion. The sealing portion 1222 of the elastic sealing piece is bent to one side of the hooked portion. An acute angle is formed between the sealing portion 1222 and the connecting portion 1221. When the blade 120 is rotated to a closed state, the hooked portion at the upper end of the lower blade 120 acts as an abutting portion and contacts the sealing portion 1222 of the elastic sealing piece of the upper blade 120, and the included angle between the sealing portion 1222 and the connecting portion 1221 is reduced. The sealing portion 1222 applies pressure to the hooked portion at the upper end of the blade 120, thereby realizing sealing between the two blades 120.

[0057] In other embodiments, with reference to Figure 19 and Figure 25 , the extension portion is bent to form an included angle. The hooked portion of the other piece body is arranged to fit the extension portion and jointly form a sealing groove with the extension portion. The connecting portion 1221 of the elastic sealing piece is clamped between the hooked portions and the extension portions of the two piece bodies, and the sealing portion 1222 is bent to form an acute angle with the connecting portion 1221. When the blade 120 is rotated to a closed state, the extension portion at the upper end of the lower blade 120 acts as an abutting portion and contacts the sealing portion 1222 of the elastic sealing piece of the upper blade 120, and the included angle between the sealing portion 1222 and the connecting portion 1221 is reduced. The sealing portion 1222 applies pressure to the extension portion at the upper end of the blade 120, thereby realizing sealing between the two blades 120.

[0058] It can be understood that the deformation of the spring sealing piece 122 caused by the abutting portion is elastic deformation. When the blade 120 is reversely rotated to an open state of the safety level high-precision air volume control valve, the spring sealing piece 122 can automatically recover.

[0059] In some embodiments, with reference to Figure 20 and Figure 21 The lowermost leaf 120 is not provided with a sealing groove and spring sealing piece 122, and the end face of the lower end thereof is flush, the lower end of the leaf 120 is connected and closed with the arc plate 115 of the lower valve seat 111, and the sealing performance between the leaf 120 and the valve seat 111 can be improved.

[0060] The above describes the preferred embodiments of the present application, but the present application is not limited to the embodiments, and those skilled in the art can make various equivalent modifications or replacements without departing from the spirit of the present application, and these equivalent modifications or replacements are all included in the scope defined by the claims of the present application.

Claims

1. A safety-grade, high-precision airflow control valve, characterized in that, include: A valve body assembly includes a frame, a blade, a rotating shaft, and a drive structure. The frame is hollow to form a cavity, and the cavity is open on both sides along a first direction. The rotating shaft extends along a second direction, and the blade is connected to the cavity through the rotating shaft. The drive structure is drivenly connected to the rotating shaft. The second direction and the first direction are perpendicular to each other. A flow measurement assembly includes a flow measurement frame and a flow measurement element. The flow measurement frame is hollow to form a flow measurement cavity. The flow measurement frame is connected to one side of the frame. The flow measurement cavity is in communication with the cavity body. The flow measurement element is disposed in the flow measurement cavity and is used to acquire the airflow parameter information of the flow measurement cavity. The flow measurement element is electrically connected to the drive structure. The drive structure is configured to control the rotating shaft to drive the blades to rotate based on the airflow parameter information obtained by the flow measuring element.

2. The safety-grade high-precision airflow control valve according to claim 1, characterized in that, The flow measuring element has a windward surface on the side away from the frame. The windward surface is an arc surface that bulges outward toward the side away from the frame. The flow measuring element has a total pressure pipeline and a static pressure pipeline extending along the second direction. The windward surface has a total pressure measuring hole extending along the first direction. The total pressure measuring hole is connected to the total pressure pipeline. The flow measuring element also has a static pressure measuring hole penetrating through the flow measuring element in the vertical direction. The static pressure measuring hole is connected to the static pressure pipeline. The first direction and the second direction are perpendicular to the vertical direction, respectively.

3. The safety-grade high-precision airflow control valve according to claim 1 or 2, characterized in that, The flow measurement assembly further includes a rectifier grid, which is connected to the side of the flow measurement frame away from the frame. The rectifier grid is provided with a plurality of rectifier holes, which pass through the rectifier grid along the first direction and communicate with the flow measurement cavity.

4. The safety-grade high-precision airflow control valve according to claim 1, characterized in that, The flow measurement assembly also includes a flow measurement rod, which extends along a second direction and is connected to the inner wall of the flow measurement cavity. The flow measurement rod has a flow measurement hole, which penetrates the flow measurement rod along a first direction. The flow measurement hole is formed by four curved surfaces surrounding it, with two opposing curved surfaces protruding towards each other. The flow measurement rod corresponds to two flow measurement elements, and the two flow measurement elements are respectively connected to two opposing curved surfaces.

5. The safety-grade high-precision airflow control valve according to claim 1, characterized in that, The frame includes two valve seats and two side sealing plates. The two valve seats extend along a second direction, and the two side sealing plates extend along a vertical direction. One valve seat is connected to the upper end of the two side sealing plates, and the other valve seat is connected to the lower end of the two side sealing plates. The two valve seats and the two side sealing plates together form the cavity. The two ends of the rotating shaft along the second direction are connected to the two side sealing plates respectively. The sidewalls of the two valve seats and the two side sealing plates that form the cavity are all arc surfaces that bulge towards the center of the cavity.

6. The safety-grade high-precision airflow control valve according to claim 5, characterized in that, The valve seat includes a clamping seat and an arc-shaped plate. The clamping seat includes a base plate and two pressure plates. The base plate extends along a second direction. The two pressure plates are respectively located at both ends of the base plate along a first direction and form an acute angle with the base plate. The base plate and the two pressure plates together form a mounting cavity facing the opening of the cavity. The arc-shaped plate is connected to the mounting cavity and protrudes towards the center of the cavity.

7. The safety-grade high-precision airflow control valve according to claim 6, characterized in that, The base plate and the two pressure plates are either integrally formed or separately formed.

8. The safety-grade high-precision airflow control valve according to claim 1, characterized in that, The valve body assembly also includes a linkage structure. The blades are provided in multiple pieces and arranged in a vertical direction. Multiple rotating shafts are provided accordingly. Each rotating shaft is connected to the linkage structure. The driving structure is driven by one of the rotating shafts to drive the rotating shaft to rotate. The rotation directions of two adjacent blades are opposite. When the blade rotates to a vertical position, the two adjacent blades abut against each other.

9. The safety-grade high-precision airflow control valve according to claim 8, characterized in that, The blade includes a blade shape and a spring sealing plate. One end of the blade shape is provided with a sealing groove, and the spring sealing plate is connected in the sealing groove. The other end of the blade shape is provided with an abutment portion. When the blade rotates to a vertical position, the abutment portion of the blade shape enters the sealing groove of the adjacent blade shape and abuts against the spring sealing plate.

10. The safety-grade high-precision airflow control valve according to claim 9, characterized in that, The blade is a one-piece molded part; or the blade includes two blades, which are connected to each other to form the sealing groove and the abutment part.

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