An air volume regulating valve

Abstract

The present invention discloses an air volume regulating valve, which relates to the technical field of air ducts, comprising a circular valve body, a support column is arranged at the inner center of the valve body, a support rod is arranged between the support column and the valve body, blades arranged in a circular array are arranged on the inner side of the valve body, a rotating shaft is fixedly connected to the normal direction of the blade, one end of the rotating shaft is rotatably connected to the inner wall of the valve body, and the other end is rotatably connected to the support column, the rotating shaft extends outwardly from the inner wall of the valve body and is fixedly connected to a driving component, the blades comprise a first blade and a second blade, the first blade and the second blade can be riveted to form a blade with a cavity shell, the outer surfaces of the first blade and the second blade are both streamlined, the rotating shaft is fixedly installed in the middle of the cavity shell, and a torsion spring is arranged on the outside of the rotating shaft. The present invention greatly improves the ability of the blades to resist wind loads, ensures that the blades can be quickly closed in the event of a fire, and facilitates the staff to accurately control the opening angle of the air volume regulating valve.

Description

Technical Field

[0001] The present invention relates to the technical field of air ducts, and more specifically to an air volume regulating valve. Background Art

[0002] The air volume control valve is a key component in the HVAC system for controlling the air flow and direction. It plays a vital role in maintaining indoor air quality. Its working principle is mainly to adjust the air flow by changing the opening of the valve. It is often used in industrial plants, civil buildings, chemical laboratories, hospital operating rooms and other occasions.

[0003] As the industry standards in the field of air duct technology continue to improve, the requirements for the blade strength of the air volume control valve are getting higher and higher. In the actual operation of the air volume control valve, the blades are subjected to large wind forces, which makes the blades prone to deformation and damage, thereby reducing the service life of the air volume control valve. The Chinese patent application number 201510707942.8 discloses a fireproof air volume control valve, including left, upper, right, and lower valve frames connected in sequence to form a square frame, and multiple groups of front blades and rear blades in a split type are arranged between the left and right valve frames. The front and rear blades have upper and lower edges, and the upper edges of the front and rear blades are provided with elastic metal seals, and the side walls of the lower valve frame are also provided with elastic metal seals; the side walls of the left and right valve frames are provided with metal sealing seats, and the two side edges of the front and rear blades are respectively movably connected to the metal sealing seats on the left and right valve frames. Although this patent enhances the strength of the blade by setting multiple reinforcing ribs on the surface of the blade, this method only enhances the strength of the blade itself. The wind load borne by the blade is not dispersed to other carrier components. The effect of enhancing the strength of the blade by this method is not significant, and twisting and deformation problems will still occur during long-term use.

[0004] In addition, the air volume of the duct is usually controlled by adjusting the blade angle. In laboratories, operating rooms, clean rooms and other places where high precision of air volume regulation is required, the precise control of the opening angle of the air volume regulating valve is crucial to ensure the effective operation of the ventilation system, which is related to whether the ventilation system can provide people with a more stable and comfortable indoor environment. For example, in clean rooms in the electronics, pharmaceutical, food and other industries, precise control of the opening angle of the air volume regulating valve can effectively ensure that the air flow and flow rate in the clean room always remain stable. This can not only provide a suitable air environment for indoor production operations, but also effectively prevent the suspension or diffusion of dust particles that may be caused by unstable airflow, and maintain a specific cleanliness level. However, the air volume regulating valves in the prior art all use a driving device to drive the blades inside the valve body to rotate. The staff cannot intuitively read the blade opening angle, nor can they accurately control the blade opening angle, which is inconvenient in actual use.

[0005] Therefore, it is necessary to design an air volume regulating valve to solve the above technical problems. Summary of the invention

[0006] The purpose of the present invention is to disclose an air volume regulating valve to solve the problems raised in the above background technology.

[0007] To achieve the above object, the present invention provides the following technical solutions:

[0008] An air volume regulating valve, comprising a circular valve body, a support column is arranged at the center of the valve body, a support rod is arranged between the support column and the valve body, a fan blade arranged in a circular array is arranged inside the valve body, a rotating shaft is fixedly connected to the normal direction of the blade, one end of the rotating shaft is rotatably connected to the inner wall of the valve body, and the other end is rotatably connected to the support column, and the rotating shaft extends outward from the inner wall of the valve body and is fixedly connected to a driving component;

[0009] The blade includes a first blade and a second blade, and the first blade and the second blade can be riveted to form a blade with a cavity shell. The outer surfaces of the first blade and the second blade are streamlined. The rotating shaft is fixedly installed in the middle of the cavity shell, and a torsion spring is arranged on the outside of the rotating shaft. A placement groove is opened at the position where the rotating shaft and the torsion spring are connected. Two reinforcement components are connected to the blade, and the two reinforcement components are symmetrically distributed with the rotating shaft as the center of symmetry.

[0010] Preferably, the reinforcement assembly includes a first section of reinforcement ribs, the first section of reinforcement ribs are fixedly connected to the first blade and the second blade, a second section of reinforcement ribs is fixedly arranged on the side of the first section of reinforcement ribs close to the valve body, the diameter of the second section of reinforcement ribs is smaller than that of the first section of reinforcement ribs, a spring is sleeved on the second section of reinforcement ribs, and a limit slider is slidably connected to the end of the second section of reinforcement ribs away from the first section of reinforcement ribs, and the two ends of the spring are respectively connected to the first section of reinforcement ribs and the limit slider.

[0011] Preferably, a groove ring is provided inside the valve body, and a plurality of grooves are provided inside the groove ring. The limit slider moves along the path of the groove ring, and the limit slider synchronously moves to the next groove every time the rotating shaft drives the blade to rotate a predetermined degree.

[0012] Preferably, an angle measuring assembly is provided on the outside of the valve body, the angle measuring assembly includes an angle measurer, the angle measurer is fixedly connected to the valve body, the angle measurer and a pointer are in conflict with each other, the pointer is fixedly connected to a driving assembly, and when the driving assembly rotates, the pointer moves synchronously in the angle measurer.

[0013] Preferably, the driving assembly includes a sliding assembly, a plurality of the sliding assemblies are arranged in a circular array on the outer wall of the valve body, and the plurality of the sliding assemblies are used for the rotating rod to rotate in a circle around the valve body, a linkage rod is arranged outside the rotating rod, the linkage rod is slidably connected to the connecting rod, and the connecting rod is fixedly connected to the rotating shaft.

[0014] Preferably, the sliding assembly comprises a roller, the roller and the rotating rod are in conflict with each other, and limit plates are arranged on both sides of the roller, and the limit plates are fixedly connected to the valve body.

[0015] Preferably, the blade rotation angle range is 0°~90°.

[0016] Preferably, the angle measuring device is provided with equal angle scale lines.

[0017] Preferably, a transmission rod is disposed outside the rotating rod, and the transmission rod can be driven to rotate manually or electrically.

[0018] Preferably, the limit slider is made of a memory molten alloy, that is, the limit slider can be melted and separated from the groove after reaching a preset temperature.

[0019] Compared with the prior art, this application has the following advantages:

[0020] 1. The present invention greatly improves the ability of the blade to resist wind load and enhances the strength of the blade by arranging a reinforcing component and a slot ring. The limit slider of each blade is clamped in the groove to provide two more force-bearing supports for the blade. When the wind load continues to act on the blade, the support transfers the wind load of the blade to the valve body, avoiding the problem of distortion and deformation of the blade during long-term use, ensuring the overall stability of the blade structure, and solving the noise pollution caused by the vibration of the blade in the prior art.

[0021] 2. The present invention sets a limit slider which melts out of the groove after reaching a preset temperature. All blades are reset and rotated under the action of a torsion spring until the blade opening angle is 0°. When a fire occurs, the blades can be quickly closed, effectively preventing the fire from spreading to other areas through the air duct system and reducing the damage caused by the fire.

[0022] 3. The present invention arranges a groove on the groove ring and an angle measuring component on the outside of the valve body. When the rotating shaft drives the blade to rotate, the limit slider and the groove work together to ensure that the angle of each rotation of the blade is 10°. At the same time, the angle measuring device can directly read the opening angle of the blade, which effectively solves the problem that the traditional air volume regulating valve cannot accurately adjust the air volume of the air duct and cannot intuitively understand the rotation angle and opening and closing status of the blade. It is convenient for the staff to accurately control the opening angle of the air volume regulating valve to ensure that the indoor air flow and flow rate always remain stable. BRIEF DESCRIPTION OF THE DRAWINGS

[0023] Figure 1 It is a structural schematic diagram of the air volume regulating valve;

[0024] Figure 2 It is a schematic diagram of the overall structure of the present invention;

[0025] Figure 3 for Figure 2 A schematic diagram of the structure enlargement of part A;

[0026] Figure 4 It is a schematic diagram of the arrangement of the rotating shaft and the reinforcement assembly of the present invention;

[0027] Figure 5 for Figure 4 Schematic diagram of section 1-1;

[0028] Figure 6 for Figure 4 Schematic diagram of section 2-2;

[0029] Figure 7 A schematic diagram of the structure for strengthening the end of the component;

[0030] Figure 8 Schematic diagram of the slot ring structure;

[0031] Fig. 9 for Figure 8 The enlarged schematic diagram of the structure of part C in the middle;

[0032] Fig.10 is a schematic diagram of the structure of the angle measurement component;

[0033] Fig.11 This is a schematic diagram of the structure of the angle measuring device.

[0034] In the figure: 1. valve body; 2. support column; 3. support rod; 4. rotating shaft; 5. blade; 51. first blade; 52. second blade; 6. groove ring; 7. reinforcement assembly; 71. first section reinforcement rib; 72. second section reinforcement rib; 73. spring; 74. limit slider; 8. drive assembly; 81. rotating rod; 82. connecting rod; 83. linkage rod; 84. transmission rod; 85. sliding assembly; 851. roller; 852. limit plate; 9. groove; 10. angle measuring assembly; 101. angle measuring device; 102. pointer; 11. torsion spring. DETAILED DESCRIPTION

[0035] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0036] Example 1

[0037] like Figures 1 to 4 As shown, an air volume regulating valve comprises a circular valve body 1, a support column 2 is arranged at the inner center of the valve body 1, a support rod 3 is arranged between the support column 2 and the valve body 1, blades 5 arranged in a circular array are arranged on the inner side of the valve body 1, and a rotating shaft 4 is fixedly connected in the normal direction of the blade 5, one end of the rotating shaft 4 is rotatably connected to the inner wall of the valve body 1, and the other end is rotatably connected to the support column 2, and the rotating shaft 4 extends outward from the inner wall of the valve body 1 and is fixedly connected to the driving assembly 8.

[0038] When in use, the support column 2 is fixedly connected to the valve body 1 through the support rod 3, ensuring the integrity of the overall structure of the air volume control valve. When the driving component 8 drives the rotating shaft 4 to rotate together, the rotating shaft 4 is fixedly connected to the blade 5, thereby prompting the blade 5 to rotate around the rotating shaft 4. At this time, the airflow flows into the room through the gaps between the blades 5.

[0039] like Figures 5 and 6 As shown, the blade 5 includes a first blade 51 and a second blade 52. The first blade 51 and the second blade 52 can be riveted to form a blade 5 with a cavity shell. The outer surfaces of the first blade 51 and the second blade 52 are streamlined. The rotating shaft 4 is fixedly installed in the middle of the cavity shell, and a torsion spring 11 is arranged on the outside of the rotating shaft 4. A placement groove is opened at the position where the rotating shaft 4 is connected to the torsion spring 11. Two reinforcing components 7 are connected to the blade 5, and the two reinforcing components 7 are symmetrically distributed with the rotating shaft 4 as the symmetry center.

[0040] By setting the surfaces of the first blade 51 and the second blade 52 to be streamlined, and setting the rotating shaft 4, the torsion spring 11 and the reinforcing component 7 in the cavity of the blade 5 and other technical means, the flatness of the outer surface of the blade 5 is ensured, the airflow can flow more smoothly through the outer surface of the blade 5, and the force on the blade 5 under the action of wind pressure is more uniform, thereby enhancing the ability of the blade 5 to resist wind pressure.

[0041] like Figure 7As shown, the reinforcing component 7 includes a first section of reinforcing ribs 71, which are fixedly connected to the first blade 51 and the second blade 52. A second section of reinforcing ribs 72 is fixedly arranged on the side of the first section of reinforcing ribs 71 close to the valve body 1. The diameter of the second section of reinforcing ribs 72 is smaller than that of the first section of reinforcing ribs 71. A spring 73 is sleeved on the second section of reinforcing ribs 72. A limiting slider 74 is slidably connected to the end of the second section of reinforcing ribs 72 away from the first section of reinforcing ribs 71. Both ends of the spring 73 are respectively connected to the first section of reinforcing ribs 71 and the limiting slider 74. In the above structure, reinforcing ribs are arranged in the blade 5, that is, two groups of reinforcing components 7 are arranged, thereby improving the structural strength of the blade 5 itself.

[0042] like Figures 8 and 9 As shown, a groove ring 6 is provided on the inner side of the valve body 1, and a plurality of grooves 9 are provided inside the groove ring 6. The limit slider 74 moves along the path of the groove ring 6. The rotating shaft 4 drives the blade 5 to rotate a predetermined number of degrees, and the limit slider 74 moves synchronously to the next groove 9.

[0043] It should be noted that the preset angle between two adjacent grooves 9 is the same, which can be 5°, 10° or 15°, etc., so as to achieve the purpose of fixing the angle of each rotation of the blade 5. For example, when the preset angle between two adjacent grooves 9 is 10°, when the limit slider 74 moves synchronously from the previous groove 9 to the next groove 9, the blade 5 also rotates 10°.

[0044] When in use, the rotating shaft 4 drives the blade 5 to rotate a predetermined degree, at which time the limit slide block 74 moves along the path of the groove ring 6. Specifically, the limit slide block 74 slides back and forth on the second section reinforcement rib 72 through the compression spring 73, and then moves from the previous groove 9 to the next groove 9. During the compression and extension of the spring 73, the limit slide block 74 always closely contacts the groove ring 6 and the groove 9; by setting the limit slide block 74 and the groove 9 to cooperate, two more force supports are provided for the blade 5. When the wind load continues to act on the blade 5, the force support can transfer the wind load of the blade 5 to the valve body 1, greatly improving the ability of the blade 5 to resist wind load, avoiding the problem of distortion and deformation of the blade 5 during long-term use. At the same time, the mutual engagement of the limit slide block 74 and the groove 9 ensures the overall stability of the blade 5 structure, reduces the vibration caused by the wind load scraping the blade 5, and thus solves the noise pollution caused by the vibration of the blade 5 in the prior art.

[0045] It should be noted that the limit slider 74 is made of a memory molten alloy, that is, the limit slider 74 can melt out of the groove 9 after reaching a preset temperature. The memory molten alloy has the characteristics of being easily deformed and melted at a preset temperature. The memory molten alloy has a sensitive preheating reaction and reliable operation. It has been widely used as a temperature sensitive element in smoke exhaust fire dampers.

[0046] Specifically, a torsion spring 11 is provided on the outside of the rotating shaft 4. During the continuous rotation of the blade 5 around the rotating shaft 4, the torsion spring 11 will deform and store torque and rotational force. The force can pull the blade 5 back to its original position. Specifically, when the blade 5 is closed, the force is zero. The greater the rotation angle of the blade 5, the greater the force. When the external force applied to the torsion spring 11 disappears, the torsion spring 11 begins to release the stored rotational force, so that the blade 5 returns to its original position.

[0047] During use, when a fire occurs in the room, as the fire spreads and expands, the limit slider 74 quickly melts out of the groove 9, and the limit slider 74 realizes the function of sensing the ambient temperature and responding to ensure the accuracy and reliability of the structure. For example, when the preset temperature is 280°C and the smoke temperature contacted by the limit slider 74 exceeds 280°C, the limit slider 74 is deformed or melted under the action of the smoke temperature, so that the groove 9 no longer has the meshing restriction effect on the limit slider 74, and then all the blades 5 are reset and rotated under the action of the rotational force of the torsion spring 11 until the opening angle of the blade 5 is 0°, that is, the blade 5 is completely closed, ensuring that the air volume regulating valve can be quickly closed when a fire occurs, effectively preventing the fire from spreading to other areas through the air duct system, and reducing the damage caused by the fire. After the fire is over, the technicians will replace the limit slider 74 in time to ensure the normal use function of the structure.

[0048] It should be noted that, in the present embodiment, the material of the blade 5 is preferably a fireproof and heat-insulating material.

[0049] Furthermore, because when the blade 5 is working normally, the larger the opening angle is, the greater the rotational force stored in the torsion spring 11 on the blade 5 is. The direction of action of the rotational force is opposite to the direction in which the blade 5 opens, and then the force is transmitted through the blade 5 and the reinforcing component 7 to cause the limit slider 74 to squeeze the groove 9, thereby strengthening the meshing contact strength between the limit slider 74 and the groove 9, thereby improving the overall stability of the blade 5 structure and further enhancing the ability of the blade 5 to resist wind loads.

[0050] Example 2

[0051] As described in the above-mentioned embodiment 1, although the structure improves the ability of the blades to resist wind loads and avoids the problem of twisting and deformation of the blades during long-term use, and at the same time ensures that the blades can be closed in time when a fire occurs, effectively preventing the spread of the fire, but because when the internal blades of the air volume regulating valve in the prior art rotate, the staff cannot intuitively read the blade opening angle, nor can they accurately control the blade opening angle, which makes it difficult to provide an indoor environment with stable air flow and flow rate. The following solution is proposed to the above-mentioned problem.

[0052] like Figure 2~3As shown, the driving assembly 8 includes a sliding assembly 85, and a plurality of sliding assemblies 85 are arranged in a circular array on the outer wall of the valve body 1, and the plurality of sliding assemblies 85 are used for the rotating rod 81 to rotate in a circle around the valve body 1, and a linkage rod 83 is arranged outside the rotating rod 81, and the linkage rod 83 is slidably connected to the connecting rod 82, and the connecting rod 82 is fixedly connected to the rotating shaft 4.

[0053] Specifically, the sliding assembly 85 includes a roller 851, the rotating rod 81 and the roller 851 are in contact with each other, and a limit plate 852 is provided on both sides of the roller 851 to limit the rotating rod 81 from moving up and down, and the limit plate 852 is fixedly connected to the valve body 1. In addition, a transmission rod 84 is provided outside the rotating rod 81, and the transmission rod 84 can be driven to rotate manually or electrically.

[0054] When in use, the transmission rod 84 is first driven to rotate manually or electrically, and the rotation of the transmission rod 84 drives the rotating rod 81 to make a circular motion on the roller 851, and then the linkage rod 83 fixedly connected to the rotating rod 81 rotates synchronously, thereby driving the connecting rod 82 to rotate, and the rotation of the connecting rod 82 drives the rotating shaft 4 to rotate, and finally the blades 5 complete the opening and closing action. By setting the driving component 8, it is convenient to control the rotation of the blades 5. Only by driving one transmission rod 84, all the blades 5 can be rotated or closed at the same time. The process of adjusting the angle of the blades 5 is smooth and continuous, with a simple structure and easy operation.

[0055] like Figure 8 As shown, when the preset angle between two adjacent grooves 9 is 10°, the rotating shaft 4 drives the blade 5 to rotate, and the limiting slider 74 and the groove 9 work together to ensure that the angle of each rotation of the blade 5 is 10°. The rotation angle of the blade 5 is 0° when it is closed, and the rotation angle of the blade 5 is 90° when it is fully opened. Therefore, the rotation angle range of the blade 5 is 0°~90°.

[0056] like Figures 10-11 As shown, an angle measuring assembly 10 is provided on the outside of the valve body 1, and the angle measuring assembly 10 includes an angle measuring device 101, which is fixedly connected to the valve body 1, and the angle measuring device 101 and the pointer 102 are in conflict with each other. The pointer 102 is fixedly connected to the driving assembly 8, and the pointer 102 moves synchronously in the angle measuring device 101 when the driving assembly 8 rotates. Equal angle scale lines are provided on the angle measuring device 101. When the blade 5 is in a closed state, the pointer 102 points to the 0° scale line of the angle measuring device 101. When the blade 5 rotates 10° every time, the pointer 102 moves synchronously to the next scale line. When the blade 5 is fully opened, the pointer 102 points to the 90° scale line of the angle measuring device 101.

[0057] It should be noted that the two adjacent grooves 9 disclosed in the above embodiment control the rotation angle of the blade 5 to be 10°, and the opening angle of the blade 5 is adjusted by the engagement of the limit slider 74 and the groove 9, ensuring that the opening angle of the blade 5 is constant. The values ​​of the two adjacent scale lines on the angle measuring device 101 differ by 10°, which are used to display the rotation angle of the blade 5. The staff can intuitively understand the opening angle and opening and closing state of the blade 5 inside the valve body 1, and then accurately adjust the blade 5 according to actual needs to control the indoor air volume and wind speed. This structure is provided with a limit slider 74, a groove 9 and an angle measuring device 101, which work together to accurately control the opening angle of the blade 5, ensuring that the air flow and flow rate always remain stable, and meeting the requirements for air flow and flow rate in places with high requirements for air volume adjustment accuracy.

[0058] Furthermore, when the place where the air volume control valve is used has higher requirements on the adjustment accuracy, the two adjacent grooves 9 can be set to control the rotation angle of the blade 5 to be 5°, and the value difference between the two adjacent scale lines on the angle measuring device 101 is 5°, thereby further improving the rotation accuracy of the blade 5 to meet various usage environments.

[0059] Finally, it should be noted that the above is only a preferred embodiment of the present invention and is not intended to limit the present invention. Although the present invention has been described in detail with reference to the aforementioned embodiments, it is still possible for those skilled in the art to modify the technical solutions described in the aforementioned embodiments or to make equivalent substitutions for some of the technical features therein. Any modifications, equivalent substitutions, improvements, etc. made within the spirit and principles of the present invention should be included in the protection scope of the present invention.

Claims

1. An air volume regulating valve, characterized in that: The valve body (1) comprises a circular valve body (1), wherein a support column (2) is arranged at the center of the interior of the valve body (1), a support rod (3) is arranged between the support column (2) and the valve body (1), and blades (5) arranged in a circular array are arranged on the inner side of the valve body (1), and a rotating shaft (4) is fixedly connected to the normal direction of the blades (5), one end of the rotating shaft (4) is rotatably connected to the inner wall of the valve body (1), and the other end is rotatably connected to the support column (2), and the rotating shaft (4) extends outward from the inner wall of the valve body (1) and is fixedly connected to a drive assembly (8); The blade (5) comprises a first blade (51) and a second blade (52), the first blade (51) and the second blade (52) being capable of being riveted together to form a blade (5) having a hollow shell, the outer surfaces of the first blade (51) and the second blade (52) being streamlined, the rotating shaft (4) being fixedly mounted in the middle of the hollow shell, a torsion spring (11) being disposed outside the rotating shaft (4), a placement groove being provided at a position where the rotating shaft (4) and the torsion spring (11) are connected, two reinforcement components (7) being connected to the blade (5), and the two reinforcement components (7) being symmetrically distributed with the rotating shaft (4) as a symmetry center; The reinforcing assembly (7) comprises a first section of reinforcing ribs (71), the first section of reinforcing ribs (71) being fixedly connected to the first blade (51) and the second blade (52), a second section of reinforcing ribs (72) being fixedly arranged on the side of the first section of reinforcing ribs (71) close to the valve body (1), the diameter of the second section of reinforcing ribs (72) being smaller than the diameter of the first section of reinforcing ribs (71), a spring (73) being sleeved on the second section of reinforcing ribs (72), a limiting slider (74) being slidably connected to one end of the second section of reinforcing ribs (72) away from the first section of reinforcing ribs (71), and two ends of the spring (73) being respectively connected to the first section of reinforcing ribs (71) and the limiting slider (74); A groove ring (6) is provided on the inner side of the valve body (1), and a plurality of grooves (9) are provided in the groove ring (6); the limit slider (74) moves along the path of the groove ring (6), and the rotation shaft (4) drives the blade (5) to rotate by a predetermined number of degrees, and the limit slider (74) moves synchronously to the next groove (9); The limit slider (74) is made of a memory molten alloy, that is, the limit slider (74) can be melted and separated from the groove (9) after reaching a preset temperature.

2. The air volume regulating valve according to claim 1, characterized in that: An angle measuring assembly (10) is arranged outside the valve body (1), the angle measuring assembly (10) comprising an angle measuring device (101), the angle measuring device (101) being fixedly connected to the valve body (1), the angle measuring device (101) and a pointer (102) being in contact with each other, the pointer (102) being fixedly connected to a driving assembly (8), and the pointer (102) moving synchronously in the angle measuring device (101) when the driving assembly (8) rotates.

3. The air volume regulating valve according to claim 1, characterized in that: The driving assembly (8) comprises a sliding assembly (85), wherein a plurality of the sliding assemblies (85) are arranged in a circular array on the outer wall of the valve body (1), and the plurality of the sliding assemblies (85) are used to cause the rotating rod (81) to perform a circular rotation around the valve body (1), and a linkage rod (83) is arranged outside the rotating rod (81), wherein the linkage rod (83) is slidably connected to the connecting rod (82), and the connecting rod (82) is fixedly connected to the rotating shaft (4).

4. The air volume regulating valve according to claim 3, characterized in that: The sliding assembly (85) comprises a roller (851), the roller (851) and the rotating rod (81) are in contact with each other, and limiting plates (852) are provided on both sides of the roller (851), and the limiting plates (852) are fixedly connected to the valve body (1).

5. The air volume regulating valve according to claim 1, characterized in that: The blade (5) rotates at an angle ranging from 0° to 90°.

6. The air volume regulating valve according to claim 2, characterized in that: The angle measuring device (101) is provided with equal angle scale lines.

7. The air volume regulating valve according to claim 3, characterized in that: A transmission rod (84) is arranged outside the rotating rod (81), and the transmission rod (84) can be driven to rotate manually or electrically.

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