Ventilation butterfly valve structure and negative pressure fan

Abstract

The utility model discloses a ventilation butterfly valve structure which is used for a negative pressure fan and comprises a butterfly plate, a valve rod and a base. The butterfly plate comprises a left butterfly plate and a right butterfly plate; one side of the valve rod is hinged to the left butterfly plate, and the other side of the valve rod is hinged to the right butterfly plate. The two ends of the valve rod are fixed to the base, a supporting column is arranged on the base, and the supporting column, the valve rod and the mounting column are connected to form a triangular structure. The left butterfly plate and the right butterfly plate are connected with the valve rod through hinges, installation difficulty is reduced, and production efficiency is improved. The supporting column is connected with the valve rod and the mounting column to form a triangular structure, stability is achieved, the firmness of the fan is improved, violent shaking can be generated due to the change of the flow speed of air in the opening and closing process of the butterfly plate, and the negative pressure fan can be prevented from generating serious shaking in the process from starting to closing.

Description

Technical Field

[0001] This utility model relates to the field of negative pressure fan technology, specifically a ventilation butterfly valve structure. Background Technology

[0002] The ventilation butterfly valve in a negative pressure fan is mainly used to regulate air volume and pressure, and can be adjusted as needed for production. By adjusting the opening and closing degree of the butterfly plate, the flow rate of gas in the pipeline is controlled to stabilize production processes, reduce energy consumption, and ensure safe operation. Rotating the butterfly plate can also change the direction of gas flow, making it relatively stable, reducing resistance within the pipeline, and improving ventilation efficiency. During operation, it effectively prevents backflow of gas, avoiding accidents.

[0003] In existing technologies, the butterfly plate structure is not stable enough, which makes the product unstable during use and prone to severe shaking, affecting work efficiency. Utility Model Content

[0004] To overcome the above-mentioned technical defects, this utility model provides a ventilation butterfly valve structure.

[0005] To solve the above problems, this utility model is implemented according to the following technical solution:

[0006] The present invention discloses a ventilation butterfly valve structure for use in a negative pressure fan, comprising: a butterfly plate, a valve stem, and a base;

[0007] The butterfly plate includes: a left butterfly plate and a right butterfly plate;

[0008] One side of the valve stem is hinged to the left butterfly plate, and the other side of the valve stem is hinged to the right butterfly plate;

[0009] The base is provided with a plurality of mounting columns, and the two ends of the valve stem are fixedly connected to the base. The base is provided with support columns, and the support columns, the valve stem and the mounting columns are connected to form a triangular structure.

[0010] Preferably, a connector is provided on the front side of both the left and right butterfly plates; a tension spring is provided on the connector, and one end of the tension spring is connected to the valve stem.

[0011] Preferably, the left butterfly plate and the right butterfly plate are symmetrical to each other;

[0012] Both the left butterfly plate and the right butterfly plate include a flat plate and a baffle.

[0013] One side of the plate is hinged to the valve stem, and the other side of the plate is provided with a U-shaped channel;

[0014] The U-shaped channel is connected to the baffle, and a protrusion adapted to the U-shaped channel is provided on one side of the baffle.

[0015] A limiting platform is provided on the back of the flat plate.

[0016] Preferably, the back of the butterfly plate is provided with a dovetail-shaped structure.

[0017] Preferably, a limit plate is provided on the valve stem.

[0018] Preferably, the flat plate and the baffle are connected by bolts.

[0019] Preferably, the base is provided with a plurality of mounting posts, and both ends of the valve stem are connected to the mounting posts;

[0020] A sealing ring is provided around the upper surface of the base;

[0021] The upper surface is an inclined surface.

[0022] Preferably, the sealing ring is made of urethane rubber.

[0023] Preferably, the plate, baffle, valve stem, and base are made of stainless steel.

[0024] A negative pressure fan is provided in a second aspect of this utility model, characterized in that the negative pressure fan includes the ventilation butterfly valve structure described in the first aspect of this utility model.

[0025] Compared with the prior art, the beneficial effects of this utility model are:

[0026] The present invention discloses a ventilation butterfly valve structure for use in a negative pressure fan, comprising: a butterfly plate, a valve stem, and a base;

[0027] The butterfly plate includes a left butterfly plate and a right butterfly plate; one side of the valve stem is hinged to the left butterfly plate, and the other side of the valve stem is hinged to the right butterfly plate; both ends of the valve stem are fixed to the base, and a support column is provided on the base. The support column, the valve stem, and the mounting column are connected to form a triangular structure.

[0028] The left and right butterfly plates are hinged to the valve stem, reducing installation difficulty and improving production efficiency. The support column, valve stem, and mounting column form a triangular structure, which provides stability and improves the fan's rigidity. This prevents severe vibrations caused by changes in airflow velocity during the opening and closing of the butterfly plates. This invention can prevent severe vibrations from occurring during the operation of the negative pressure fan from start to stop. Attached Figure Description

[0029] The specific embodiments of this utility model will be further described in detail below with reference to the accompanying drawings, wherein:

[0030] Figure 1 This is a schematic diagram of a ventilation butterfly valve according to the present invention;

[0031] Figure 2 yes Figure 1 Enlarged diagram of A in the middle;

[0032] Figure 3 This is a front view of the butterfly plate of a ventilation butterfly valve structure according to this utility model;

[0033] Figure 4 This is a schematic diagram of the back of the butterfly plate of a ventilation butterfly valve structure according to this utility model;

[0034] Figure 5 This is a schematic diagram of the baffle part in the structure of a ventilation butterfly valve according to this utility model;

[0035] Figure 6 This is a schematic diagram of the flat plate component in the structure of a ventilation butterfly valve according to this utility model;

[0036] Figure 7 This is a side view of a ventilation butterfly valve structure according to this utility model;

[0037] In the diagram: 1-Butterfly plate, 10-Left butterfly plate, 11-Right butterfly plate, 101-Flat plate, 102-Baffle, 103-Connector, 104-Tension spring, 105-Limiting platform, 106-U-shaped channel, 107-Boss, 108-Snap fastener, 12-Valve stem, 121-Limiting plate, 122-Fixing component, 13-Base, 131-Sealing ring, 132-Mounting column, 133-Support column, 134-Upper surface, 14-Front side, 15-Back side. Detailed Implementation

[0038] The preferred embodiments of the present invention will be described below with reference to the accompanying drawings. It should be understood that the preferred embodiments described herein are for illustration and explanation only and are not intended to limit the present invention.

[0039] like Figures 1-7 As shown, the present invention discloses a ventilation butterfly valve structure for a negative pressure fan, comprising: a butterfly plate 1, a valve stem 12, and a base 13; the butterfly plate 1 includes: a left butterfly plate 10 and a right butterfly plate 11; one side of the valve stem 12 is hinged to the left butterfly plate 10, and the other side of the valve stem 12 is hinged to the right butterfly plate 11; a plurality of mounting columns 132 are provided on the base 13, both ends of the valve stem 12 are fixedly connected to the base 13, and a support column 133 is provided on the base 13, the support column 133 being connected to the valve stem 12 and the mounting column 132 to form a triangular structure;

[0040] Understandably, one side of the valve stem 12 is hinged to the left butterfly plate 10, and the other side of the valve stem 12 is hinged to the right butterfly plate 11, allowing the butterfly plate 1 to open and close. Figure 7 As shown, a plurality of mounting posts 132 are provided on the base 13, and the two ends of the valve stem 12 are fixed on the base 13. In one embodiment, the base 13 is a cylindrical structure, and the two ends of the valve stem 12 are fixedly connected to the mounting posts 132 by bolts. The mounting posts 132 are used to install the ventilation butterfly valve structure on the fan, which is convenient for disassembly and assembly and improves production efficiency.

[0041] In one embodiment, four mounting posts 132 are arranged equidistantly around the base 13. The two ends of the valve stem 12 are fixed to the base 13. Support posts 133 are provided on the base 13, forming a triangular structure with the valve stem 12 and the mounting posts 132. In this triangular structure, the support posts 133 fix the valve stem 12 to the mounting posts 132, improving the structural stability and preventing excessive wind force and drastic vibrations caused by changes in airflow velocity during the fan's start-up and shutdown processes. This improves the fan's efficiency and extends its service life.

[0042] Optional, such as Figure 4 As shown, a connector 103 is provided on the front side 14 of both the left butterfly plate 10 and the right butterfly plate 11. A tension spring 104 is provided on the connector 103, and one end of the tension spring 104 is connected to the valve stem 12.

[0043] Understandably, both the left butterfly plate 10 and the right butterfly plate 11 have connectors 103 on their front surfaces 14, and tension springs 104 connect valve stem 12 to connectors 103. In one embodiment, after the plate 101 and baffle 102 are assembled, connectors 103 are fixed to the front surfaces 14 of the plate 101 and baffle 102. Fixing members 122 for fixing tension springs 104 are provided on both sides of valve stem 12. Tension springs 104 are mounted on connectors 103. Connectors 103 are connected to buckles 108 for fixing tension springs 104. One end of tension spring 104 is connected to buckles 108, and the other end is connected to fixing members 122 on valve stem 12.

[0044] When the fan is turned on, the left butterfly plate 10 and the right butterfly plate 11 are in the folded open state, and the tension spring 104 is in a tensile state. When the fan is turned off, the tension spring 104 contracts under the action of its elasticity, pulling the left butterfly plate 10 and the right butterfly plate 11 flat from the folded state, at which point the left butterfly plate 10 and the right butterfly plate 11 are in the closed state. Using the tension spring 104 to close the left butterfly plate 10 and the right butterfly plate 102 is highly efficient, has a high sealing performance, is simple to install, and improves production efficiency.

[0045] Optional, such as Figures 1-2As shown, the left butterfly plate 10 and the right butterfly plate 11 are symmetrical structures; both the left butterfly plate 10 and the right butterfly plate 11 include a flat plate 101 and a baffle 102.

[0046] One side of the plate 101 is hinged to the valve stem 12, and a U-shaped channel 106 is provided on the other side of the plate 101; the U-shaped channel 106 is connected to the baffle 102, and a boss 107 adapted to the U-shaped channel 106 is provided on one side of the baffle 102.

[0047] A limiting platform 105 is provided on the back side 15 of the flat plate 101.

[0048] Understandably, the left butterfly plate 10 and the right butterfly plate 11 are symmetrical structures. In one embodiment, the left butterfly plate 10 and the right butterfly plate 11 are both formed by splicing a flat plate 101 and a baffle 102 to form a semi-circular structure. One side of the flat plate 101 of the left butterfly plate 10 is hinged to the valve stem 12, and the other side of the valve stem 12 is hinged to one side of the flat plate 101 of the right butterfly plate 11. The left butterfly plate 10 and the right butterfly plate 11 can be flipped by the valve stem 12.

[0049] Optional, such as Figure 2 As shown, a limit plate 121 is provided on the valve stem 12.

[0050] Understandably, the valve stem 12 is fixed to the base 13, and a limiting plate 121 is provided on the valve stem 12. A limiting platform 105 is provided on the back side 15 of the flat plate 101. In this embodiment, when the fan starts, the back sides 15 of the left butterfly plate 10 and the right butterfly plate 11 begin to fold until the limiting platform 105 abuts against the limiting plate 121 on the valve stem 12. At this time, the left butterfly plate 10 and the right butterfly plate 11 are in the folded open state.

[0051] like Figures 4-6 As shown, one side of the plate 101 is hinged to the valve stem 12, and the other side of the plate 101 is provided with a U-shaped channel 106; the U-shaped channel 106 is connected to the baffle 102, and one side of the baffle 102 is provided with a boss 107 adapted to the U-shaped channel 106. The plate 101 and the baffle 102 are connected by bolts. In this embodiment, one side of the plate 101 is hinged to the valve stem 12, and the other side of the plate 101 is provided with a U-shaped channel 106. One side of the baffle 102 is provided with a boss 107 adapted to the U-shaped channel 106. The boss 107 of the baffle 102 is embedded into the U-shaped channel 106 provided on the plate 101, and the plate 101 and the baffle 102 are spliced ​​and fixed using bolts. Embedding the boss 107 into the U-shaped channel 106 can improve the sealing performance of the splicing between the plate 101 and the baffle 102, reduce the installation difficulty, and improve production efficiency.

[0052] The back surface 15 of the butterfly plate 1 is provided with a dovetail-shaped structure.

[0053] Understandably, such as Figure 3 As shown, the back surface 15 of the butterfly plate 1 is provided with a dovetail structure. The butterfly plate 1 includes a left butterfly plate 10 and a right butterfly plate 11. In this embodiment, the dovetail structure can optimize the flow path of the fluid. The dovetail structure can also enhance the structural strength of the left butterfly plate 10 and the right butterfly plate 11, making them more stable, pressure-resistant, and wear-resistant, thus extending the service life of the ventilation butterfly valve.

[0054] The dovetail-shaped structure connecting the plate 101 and the baffle 102 ensures a secure connection. This design also facilitates alignment by installers during assembly, making installation and maintenance easier.

[0055] Optional, such as Figure 7 As shown, a sealing ring 131 is provided around the upper surface 134 of the base 13, and the upper surface 134 is an inclined surface. The front side 14 of the butterfly plate 1 abuts against the sealing ring 131, and the sealing ring 131 can improve the airtightness between the left butterfly plate 10 and the right butterfly plate 11 and the upper surface 134.

[0056] In one embodiment, the upper surface 134 of the base 13 is an inclined surface with a slope. When the fan is started, the airflow can quickly open the ventilation butterfly valve, improving fan performance. When the fan stops, the butterfly plate 1 is in the open state, and the butterfly plate 1 closes by its own weight and the assistance of the tension spring 104. When closed, magnets are provided around the base 13 to hold the butterfly plate 1 in place, preventing it from opening easily and improving the airtightness of the ventilation butterfly valve.

[0057] The highly airtight butterfly valve structure prevents external airflow from seeping into the room, improving the negative pressure ventilation effect and avoiding insufficient local air exchange caused by insufficient indoor air pressure, which would affect the performance of the negative pressure fan. This extends the service life of the negative pressure fan.

[0058] Optionally, the sealing ring 131 is made of urethane rubber, which has the highest wear resistance among all rubbers. It also has good cushioning and shock absorption properties, as well as good oil and chemical resistance. In this embodiment, when the butterfly plate 1 is closed, the sealing ring 131 ensures that no air flows through the ventilation butterfly valve. As the material of the sealing ring 131, urethane rubber has advantages such as high strength, high elasticity, high wear resistance, and aging resistance, which improves the sealing performance of the ventilation butterfly valve and can extend its service life.

[0059] The plate 101, baffle 102, valve stem 12, and base 13 are made of stainless steel. They have good corrosion resistance, heat resistance, low-temperature strength, and mechanical properties; they are also good for hot workability such as stamping and bending, and do not exhibit heat treatment hardening.

[0060] A negative pressure fan is provided in a second aspect of this utility model, characterized in that the negative pressure fan includes the ventilation butterfly valve structure described in the first aspect of this utility model.

[0061] The working principle of the ventilation butterfly valve structure described in this utility model is as follows:

[0062] A U-shaped channel 106 is provided on one side of the plate 101, and a boss 107 adapted to the U-shaped channel 106 is provided on one side of the baffle 102. The boss 107 of the baffle 102 is embedded into the U-shaped channel 106 on the plate 101, and the plate 101 and the baffle 102 are spliced ​​and fixed using bolts. A connector 103 is fixed to the front 14 of the plate 101 and the baffle 102, connecting the left butterfly plate 10, which is completed by splicing the first plate 101 and the first baffle 102, and the right butterfly plate 11, which is completed by splicing the second plate 101 and the second baffle 102, to the valve stem 12 via hinges. A dovetail structure is used to connect the plate 101 and the baffle 102, ensuring the firmness of the connection between the plate 101 and the baffle 102. The dovetail structure facilitates the installation personnel to check the position during the splicing of the plate 101 and the baffle 102, and is convenient for installation and maintenance.

[0063] The valve stem 12 has fasteners 122 on both sides for fixing the tension spring 104. The tension spring 104 is mounted on the connector 103. One end of the tension spring 104 is connected to the buckle 106, and the other end is connected to the valve stem 12 fastener 122.

[0064] The valve stem 12 is fixed on the base 13, and a support column 133 is provided on the base 13. The support column 133 is connected with the valve stem 12 and the mounting column 132 to form a triangular structure. In the triangular structure, the support column 133 fixes the valve stem 12 and the mounting column 132.

[0065] When the fan is turned on, the back surfaces 15 of the left butterfly plate 10 and the right butterfly plate 11 begin to fold until the limiting platform 105 abuts against the limiting plate 121 on the valve stem 12. At this time, the left butterfly plate 10 and the right butterfly plate 11 are in the folded open state, and the tension spring 104 is in the tensile state.

[0066] When the fan is turned off, the tension spring 104 contracts under the action of elasticity, pulling the left butterfly plate 10 and the right butterfly plate 11 flat from the folded state. At this time, the left butterfly plate 10 and the right butterfly plate 11 are in the closed state.

[0067] The above description is merely a preferred embodiment of the present utility model and is not intended to limit the present utility model in any way. Therefore, any modifications, equivalent changes, and alterations made to the above embodiments based on the technical essence of the present utility model without departing from the technical solution of the present utility model shall still fall within the scope of the technical solution of the present utility model.

Claims

1. A ventilation butterfly valve structure for use in a negative pressure fan, characterized in that, include: The butterfly plate (1) includes: a left butterfly plate (10) and a right butterfly plate (11); Valve stem (12), one side of which is hinged to the left butterfly plate (10), and the other side of which is hinged to the right butterfly plate (11); The base (13) is provided with a plurality of mounting columns (132). The two ends of the valve stem (12) are fixedly connected to the base (13). The base (13) is provided with a support column (133). The support column (133) is connected to the valve stem (12) and the mounting column (132) to form a triangular structure.

2. The ventilation butterfly valve structure according to claim 1, characterized in that, Connectors (103) are provided on the front side (14) of both the left and right butterfly plates. A tension spring (104) is provided on the connector (103), and one end of the tension spring (104) is connected to the valve stem (12).

3. The ventilation butterfly valve structure according to claim 1, characterized in that, The left butterfly plate (10) and the right butterfly plate (11) are symmetrical structures. The left butterfly plate (10) and the right butterfly plate (11) each include a flat plate (101) and a baffle (102). One side of the plate (101) is hinged to the valve stem (12), and the other side of the plate (101) is provided with a U-shaped channel (106). The U-shaped channel (106) is connected to the baffle (102), and a boss (107) adapted to the U-shaped channel (106) is provided on one side of the baffle (102). A limiting stage (105) is provided on the back (15) of the flat plate (101).

4. The ventilation butterfly valve structure according to claim 1, characterized in that, The back (15) of the butterfly plate (1) is provided with several swallowtail-shaped structures.

5. The ventilation butterfly valve structure according to claim 1, characterized in that, A limit plate (121) is provided on the valve stem (12).

6. The ventilation butterfly valve structure according to claim 3, characterized in that, The flat plate (101) and the baffle (102) are connected by bolts.

7. The ventilation butterfly valve structure according to claim 1, characterized in that, A sealing ring (131) is provided around the upper surface (134) of the base (13); the upper surface (134) is an inclined surface.

8. The ventilation butterfly valve structure according to claim 7, characterized in that, The sealing ring (131) is made of urethane rubber.

9. A ventilation butterfly valve structure according to claim 3, characterized in that, The plate (101), baffle (102), valve stem (12) and base (13) are made of stainless steel.

10. A negative pressure fan, characterized in that, The negative pressure fan includes the ventilation butterfly valve structure as described in any one of claims 1 to 9.

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