Air regulating door of fan

Abstract

The air regulating door of the fan comprises a barrel body and a telescopic body in the barrel body, an aperture valve is arranged in the middle of the barrel, and an adjusting hole capable of contracting or expanding is formed in the middle of the aperture valve. The telescopic body is a tubular body which can be elastically deformed when being stressed and can be elastically recovered when being not stressed; the middle part of the telescopic body penetrates through the adjusting hole, and a throat section which is elastically propped against the inner wall of the adjusting hole is formed in the adjusting hole; the section size of the throat section is shrunk or expanded along with the adjusting hole; the two ends of the telescopic body are tensioned and fixed at the two ends of the cylinder body respectively, so that the telescopic body forms a contraction section and an expansion section connected to the two sides of the throat section, and the contraction angle of the contraction section and the divergence angle of the expansion section dynamically change along with the sectional dimension of the throat section; a contraction section, a throat section and an expansion section are sequentially connected between the inlet end and the outlet end of the cylinder body to form a low-resistance air cavity in the cylinder body; according to the air regulating door of the fan, the blocking of the blades to airflow is reduced, so that the airflow can uniformly fill a flow channel between the full opening and the full closing of the air regulating door, the turbulent flow is reduced, and the efficiency of the fan is improved.

Description

Technical Field

[0001] The invention relates to the technical field of fans, and in particular to a fan air damper. Background Art

[0002] As a common accessory of the fan, the damper is a device used to adjust the fan air volume. When the fan and its supporting pipe network work together, if the resistance of the pipe network system is stable during the joint operation, the fan will also work stably in a certain working condition. The performance adjustment of the fan is to change the opening size of the damper according to the change of the pipe network performance to control the fan air volume to meet the production process needs.

[0003] The commonly used dampers of fans are equipped with rotatable blades, which are used to adjust the size of the damper air passage section by rotating the blades, thereby controlling the air volume. When the damper is fully open, the blades have little or no obstruction to the airflow, but when the damper is adjusted to between fully open and fully closed, the direction of the airflow is forced to change after passing through the blades, resulting in serious turbulence of the airflow entering the fan. The turbulent airflow cannot evenly and effectively fill the impeller flow channel, significantly reducing the efficiency of the fan.

[0004] For this purpose, we researched and proposed a fan damper. Summary of the invention

[0005] The purpose of the present invention is to provide a fan damper to reduce the obstruction of airflow by blades so that the airflow can evenly fill the flow channel between the full opening and full closing of the damper, thereby reducing turbulence and improving the efficiency of the fan.

[0006] The technical solution adopted by the present invention is: a fan air damper, comprising a cylinder and a telescopic body inside the cylinder; An aperture valve is provided in the middle of the cylinder, and an adjustment hole capable of contraction or expansion is provided in the middle of the aperture valve; The telescopic body is a tubular body that can be elastically deformed when subjected to force and can be elastically restored when not subjected to force; The middle part of the telescopic body passes through the adjusting hole, and forms a throat section in the adjusting hole to maintain elastic contact with the inner wall of the adjusting hole; the cross-sectional size of the throat section shrinks or expands with the adjusting hole; The two ends of the telescopic body are respectively tensioned and fixed to the two ends of the cylinder, so that the telescopic body forms a contraction section and an expansion section connected to the two sides of the throat section, and the contraction angle of the contraction section and the diffusion angle of the expansion section change dynamically with the cross-sectional size of the throat section; The inlet end and the outlet end of the cylinder are connected in sequence with a contraction section, a throat section and an expansion section to form a low-resistance wind cavity in the cylinder.

[0007] As a preferred solution, the cylinder is a cylindrical shell with open ends, and the inner diameter of the cylinder is equal to the outer diameter of the telescopic body; The inner diameter of the cylinder is equal to the maximum inner diameter of the adjusting hole.

[0008] As a preferred solution, the telescopic body is a rubber tube.

[0009] As a preferred solution, the aperture valve member is arranged at 1 / 3 of the distance from the inlet end of the cylinder.

[0010] As a preferred solution, the inner diameters of the contraction section and the expansion section gradually decrease along the axis of the cylinder in a direction toward the throat section.

[0011] As a preferred solution, the contraction section and the expansion section are both in a conical tube shape.

[0012] As a preferred solution, the adjustment hole is located on the center line of the aperture valve member.

[0013] As a preferred solution, the aperture valve member includes a fixed ring, a movable ring and a plurality of blades; A fixing ring is fixed at the middle of the cylinder, and the fixing ring has a blade mounting groove communicating with the inner cavity of the cylinder, and a polygonal slide is provided on the cross section of the fixing ring, and the number of sides of the slide is consistent with the number of blades; A plurality of blades are arranged in the blade installation groove at equal angles along the axis of the fixing ring, and adjacent edges of adjacent blades are in sliding contact and surround to form an adjustment hole; each blade is triangular, having two sliding contact edges and one non-contact edge, wherein the front and back sides of the diagonal edges of one sliding contact edge are respectively fixed with a limiting column and a slider, and the slider is slidably arranged in the corresponding slideway; The movable ring is rotatably arranged on the outer side of the cylinder, and a limiting groove is provided on the movable ring, which is slidably matched with the limiting column. The movable ring can drive multiple blades to twist synchronously clockwise or counterclockwise to control the inner diameter of the adjusting hole.

[0014] As a preferred solution, all blades are located at the same position in the axial direction of the cylinder.

[0015] As a preferred solution, the adjustment hole is approximately circular.

[0016] Compared with the prior art, the present invention has the following beneficial effects: 1. Under the action of the aperture valve, the telescopic body forms a Venturi tube structure. The gas velocity is the highest in the contraction section, and the larger kinetic energy is enough to overcome the friction. The gas diffuses evenly in the diffusion section, which can make the airflow evenly fill the flow channel to reduce turbulence. The telescopic body changes elastically with the size of the aperture valve adjustment hole and can adapt to different adjustment hole sizes.

[0017] 2. The aperture valve does not come into direct contact with the airflow, and the valve itself does not require excessively high precision. The sealing of the aperture valve in the fully closed state is compensated by the elastic deformation of the telescopic body, which can reduce the processing difficulty and production cost of the aperture valve.

[0018] 3. The present invention is very suitable for industrial sites where the uniformity of airflow is precisely and strictly controlled, and can achieve the purpose of uniformly adjusting the flow rate without changing the original air intake direction.

[0019] 4. Compared with plate-type and petal-type air dampers, the aperture valve of the present invention has fewer linkage devices and a simpler structure. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings required for use in the embodiments or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative work.

[0021] Figure 1 It is a cross-sectional schematic diagram of the present invention as a whole; Figure 2 It is a schematic diagram of the cooperation between the blade and the fixing ring in the present invention; Figure 3 is a schematic diagram of a blade in the present invention; Figure 4 This is a state diagram of the aperture valve member in the present invention when it is fully closed; Figure 5 This is a state diagram of the aperture valve member of the present invention when it is 30% open; Figure 6 This is a state diagram of the aperture valve member of the present invention being 60% open; Figure 7 This is a state diagram of the aperture valve member of the present invention being 80% open; Figure 8 for Figure 1 A partial schematic diagram of the .

[0022] Reference numerals: 1. Cylinder, 101, flange; 2. telescopic body, 201. throat section, 202. contraction section, 203. expansion section, 204. extension section; 3. Adjustment hole; 4. Fixed ring, 401, slideway; 5. Moving ring, 501, limiting groove; 6. Blade, 601. Limiting column, 602. Sliding block, 603. Sliding contact edge. DETAILED DESCRIPTION

[0023] The present invention is described in detail below by way of exemplary embodiments. However, it should be understood that, without further description, elements, structures and features in one embodiment may also be beneficially combined in other embodiments.

[0024] It should be noted that: unless otherwise defined, the technical terms or scientific terms used in this document shall have the usual meanings understood by people with ordinary skills in the field to which the invention belongs. The words "one", "an" or "the" and the like used in the patent application specification and claims of the present invention do not express quantity restrictions, but indicate the existence of at least one; the words "first", "second" and "third" used in this document shall not be regarded as restrictions on the order of components, but are only used to distinguish different components; words such as "include" or "comprise" and the like indicate that the elements or objects appearing before "include" or "comprise" include the elements or objects listed after "include" or "comprise" and their equivalents, but do not exclude other elements or objects with the same function.

[0025] In order to more clearly describe the specific structural composition of the fan damper, Figure 1-8 Describe this embodiment: like Figure 1 As shown, a fan damper comprises a cylinder 1 and a telescopic body 2 inside thereof; an aperture valve member is provided in the middle of the cylinder 1, and an adjustment hole 3 capable of contraction or expansion is provided in the middle of the aperture valve member; the telescopic body 2 is a tubular body capable of elastic deformation when subjected to force and elastic recovery when not subjected to force; the middle of the telescopic body 2 passes through the adjustment hole 3, and a throat section 201 is formed in the adjustment hole 3 to maintain elastic contact with the inner wall of the adjustment hole 3 (maintaining contact under the action of the elastic recovery of the telescopic body itself); the cross-sectional size of the throat section 201 contracts or expands with the adjustment hole 3; the two ends of the telescopic body 2 are respectively tensioned and fixed on the two ends of the cylinder 1, so that the telescopic body 2 forms a contraction section 202 and an expansion section 203 connected to both sides of the throat section 201, and the contraction angle of the contraction section 202 and the diffusion angle of the expansion section 203 change dynamically with the cross-sectional size of the throat section 201; the contraction section 202, the throat section 201 and the expansion section 203 are connected in sequence between the inlet end and the outlet end of the cylinder 1 to form a low-resistance air cavity in the cylinder 1.

[0026] The size of the adjustment hole 3 is controlled by the aperture valve. When the adjustment hole 3 is adjusted to a smaller size, the adjustment hole 3 applies centripetal pressure to the outside of the telescopic body 2, so that the throat section 201 of the telescopic body 2 elastically contracts; when the adjustment hole 3 is adjusted to a larger size, the telescopic body 2 always keeps in contact with the inner wall of the adjustment hole due to its own elastic deformation, and the size of the throat section 201 is synchronized with the size of the adjustment hole 3. The airflow passes through the inlet end, the contraction section 202, the throat section 201, the expansion section 203 and the outlet end in sequence, and finally enters the flow channel of the fan. The gas has the highest flow velocity in the contraction section, and the larger kinetic energy is enough to overcome the friction, while the gas diffuses evenly in the diffusion section, which can make the airflow evenly fill the flow channel to reduce turbulence.

[0027] The telescopic body 2 can be elastically changed along with the size of the aperture valve member adjusting the hole 3, and the contraction angle of the contraction section 202 and the diffusion angle of the expansion section 203 can be adaptively adjusted along with the change of the aperture of the adjusting hole 3, thereby minimizing the resistance to the airflow; The inner diameters of the contraction section 202 and the expansion section 203 gradually decrease along the axis of the cylinder 1 in the direction toward the throat section 201. Specifically, the contraction section 202 and the expansion section 203 are both conical tube-shaped, the contraction angle is the cone angle of the contraction section 202, and the diffusion angle is the cone angle of the expansion section 203.

[0028] See also Figure 1 The cylinder 1 is specifically a cylindrical shell with open ends. The inner diameter of the cylinder 1 is equal to the outer diameter of the telescopic body 2; the inner diameter of the cylinder 1 is equal to the maximum inner diameter of the adjustment hole 3. When the adjustment hole 3 is fully opened, the telescopic body 2 returns to a cylindrical shape, and there is no resistance to the airflow at all.

[0029] The telescopic body 2 is made of a material with elasticity and high telescopicity, specifically a rubber tube. The aperture valve member does not come into direct contact with the airflow, and the valve member itself does not require excessively high precision. The sealing performance of the aperture valve member in the fully closed state is compensated by the elastic deformation of the telescopic body 2, which can reduce the processing difficulty and production cost of the aperture valve member.

[0030] Specifically, the aperture valve member is arranged at 1 / 3 of the distance from the inlet end of the cylinder 1 , so that the length of the contraction section 202 is smaller than the length of the expansion section 203 , which is conducive to the airflow quickly filling the outlet end of the cylinder 1 .

[0031] The adjustment hole 3 is preferably located on the center line of the aperture valve member, so that the force and deformation of the telescopic body 2 can be more uniform.

[0032] See also Figure 2 and Figure 3 , the aperture valve member comprises a fixed ring 4, a moving ring 5 and a plurality of blades 6; The fixing ring 4 is fixed at the middle of the cylinder 1, and the fixing ring 4 has a blade mounting groove connected to the inner cavity of the cylinder 1. A polygonal slide 401 is provided on the cross section of the fixing ring 4, and the number of sides of the slide 401 is consistent with the number of blades 6; A plurality of blades 6 are arranged in the blade installation groove at equal angles along the axis of the fixing ring 4, and the adjacent edges of adjacent blades 6 are in sliding contact and surround to form the adjustment hole 3; each blade 6 is triangular, having two sliding contact edges 603 and one non-contact edge, wherein the front and back sides of the diagonal sides of one sliding contact edge 603 are respectively fixed with a limiting column 601 and a slider 602, and the slider 602 is slidably arranged in the corresponding slideway 401; The movable ring 5 is rotatably arranged on the outer side of the cylinder 1. A limiting groove 501 is provided on the movable ring 5, which is slidably matched with the limiting column 601. The limiting groove 501 is a waist-shaped groove, which is roughly arranged along the radial direction of the movable ring 5. The movable ring 5 drives multiple blades 6 to twist synchronously clockwise or counterclockwise through the limiting column 601 to control the inner diameter of the adjustment hole 3.

[0033] During specific use, a damping mechanism may be added between the dynamic ring 5 and the cylinder 1 so that the blades 6 can stay at any position without being affected by the airflow.

[0034] All blades 6 are at the same axial position on the cylinder 1, thereby ensuring that the contact surfaces of all blades 6 and the throat section 201 are in the same annular area, ensuring that the compression position of the telescopic body 2 is uniform, the deformation is uniform, and the aperture valve has better sealing performance when it is fully closed.

[0035] The number of blades 6 in the figure is 8, and the actual number is set according to the actual accuracy requirements. A larger number of blades 6 can make the enclosed regulating hole 3 close to a circle, and also make the flow channel of the throat section 201 closer to a circle, thereby improving the control accuracy.

[0036] The aperture valve member may also be a product of the prior art, and when matched with the telescopic body 2, the airflow can evenly fill the flow channel.

[0037] See also Figure 8 Two flanges 101 are provided at both ends of the cylinder 1, one of which is detachable. When the end of the telescopic body 2 is installed, the extension part 204 is connected to the end of the telescopic body 2 and fixed between the two flanges.

[0038] The parts not described in detail in the above embodiments are prior art.

[0039] It should be noted that although the present invention is described by the above embodiments, the present invention may also have other various embodiments. Without departing from the spirit and scope of the present invention, it is obvious that those skilled in the art may make various corresponding changes and deformations to the present invention, but these changes and deformations should all fall within the scope of protection of the appended claims of the present invention and their equivalents.

Claims

1. A fan damper, characterized in that: It comprises a cylinder (1) and a telescopic body (2) inside it; An aperture valve member is provided in the middle of the cylinder (1), and an adjustment hole (3) capable of contraction or expansion is provided in the middle of the aperture valve member; The telescopic body (2) is a tubular body that can elastically deform when subjected to force and can elastically recover when not subjected to force; The middle portion of the telescopic body (2) passes through the adjusting hole (3), and forms a throat section (201) in the adjusting hole (3) that is in elastic contact with the inner wall of the adjusting hole (3); the cross-sectional dimensions of the throat section (201) shrink or expand along with the adjusting hole (3); The two ends of the telescopic body (2) are respectively tensioned and fixed to the two ends of the cylinder (1), so that the telescopic body (2) forms a contraction section (202) and an expansion section (203) connected to the two sides of the throat section (201), and the contraction angle of the contraction section (202) and the diffusion angle of the expansion section (203) change dynamically with the cross-sectional size of the throat section (201); The inlet end and the outlet end of the cylinder (1) are connected in sequence to a contraction section (202), a throat section (201) and an expansion section (203), forming a low-resistance wind cavity in the cylinder (1).

2. The air damper of a fan according to claim 1, characterized in that: The cylinder (1) is a cylindrical shell with open ends, and the inner diameter of the cylinder (1) is equal to the outer diameter of the telescopic body (2); The inner diameter of the cylinder (1) is equal to the maximum inner diameter of the adjustment hole (3).

3. The air damper of a fan according to claim 1, characterized in that: The telescopic body (2) is a rubber tube.

4. The air damper of a fan according to claim 1, characterized in that: The aperture valve member is arranged at a distance of 1 / 3 from the inlet end of the cylinder (1).

5. The air damper of a fan according to claim 1, characterized in that: The inner diameters of the contraction section (202) and the expansion section (203) gradually decrease along the axis of the cylinder (1) in a direction toward the throat section (201).

6. The air damper of a fan according to claim 1, characterized in that: The contraction section (202) and the expansion section (203) are both in the shape of a cone tube.

7. The air damper of a fan according to claim 1, characterized in that: The adjustment hole (3) is located on the center line of the aperture valve member.

8. The air damper of a fan according to claim 1, characterized in that: The aperture valve component comprises a fixed ring (4), a movable ring (5) and a plurality of blades (6); A fixing ring (4) is fixed at the middle of the cylinder (1), and the fixing ring (4) has a blade mounting groove communicating with the inner cavity of the cylinder (1), and a polygonal slideway (401) is provided on the cross section of the fixing ring (4), and the number of sides of the slideway (401) is consistent with the number of blades (6); A plurality of blades (6) are arranged in the blade mounting groove at equal angles along the axis of the fixing ring (4), and adjacent edges of adjacent blades (6) are in sliding contact and surround to form an adjustment hole (3); each blade (6) is triangular in shape, having two sliding contact edges and one non-contact edge, wherein a limiting column (601) and a sliding block (602) are respectively fixed on the front and rear sides of the diagonal sides of one sliding contact edge, and the sliding block (602) is slidably arranged in a corresponding slideway (401); The movable ring (5) is rotatably arranged on the outer side of the cylinder (1), and is provided with a limit groove (501) which is slidably matched with the limit column (601) one by one. The movable ring (5) can drive the plurality of blades (6) to twist synchronously clockwise or counterclockwise to control the inner diameter of the adjustment hole (3).

9. The air damper of a fan according to claim 8, characterized in that: All blades (6) are located at the same position in the axial direction of the cylinder (1).

10. The air damper of a fan according to claim 8, characterized in that: The adjustment hole (3) is approximately circular.

Images