Square valve applied to filtering ventilation pipeline and biological safety protection equipment

Abstract

The utility model relates to a square valve and biological safety protection equipment applied to a filtering ventilation pipeline, which comprises a supporting part and an overturning part, the supporting part comprises a rectangular valve body, and two opposite surfaces of the rectangular valve body are respectively provided with an air inlet and an air outlet; the overturning part comprises a rotating shaft, a supporting shaft, a first connecting rod and a second connecting rod, the rotating shaft is arranged in the rectangular valve body in a penetrating mode, the supporting shaft is arranged in the rectangular valve body, and the axis of the supporting shaft is parallel to the axis of the rotating shaft; the end, away from the second connecting rod, of the first connecting rod is connected with the rotating shaft, and the end, away from the first connecting rod, of the second connecting rod is hinged to the supporting shaft. A valve plate is arranged on the surface of the supporting shaft in the axial direction. The rotating shaft rotates to drive the valve plate to abut against the air outlet. Connection of the square air pipes is achieved through the rectangular valve body, the double-connecting-rod mechanism rotates to drive the valve plate to turn over so that the rotating torque can be reduced, the rotating amplitude of the whole valve plate is small, the installation space of the whole valve body is reduced, and the square air pipe reversing valve is suitable for various installation environments.

Description

Technical Field

[0001] The utility model relates to the technical field of ventilation duct filtering systems, in particular to a square valve used for filtering ventilation ducts and biological safety protection equipment. Background Art

[0002] The biosafety cabinet is a type of biosafety protection equipment. It has a built-in high-efficiency filter that can prevent the spread of experimental samples and protect the samples from contamination. It also protects the experimenters, experimental samples and laboratory environment from microbial contamination. In addition, the biosafety cabinet is also equipped with a ventilation system to maintain the air quality in the laboratory, reduce the retention of pollutants, and prevent the spread of harmful substances.

[0003] The closed environment of the biological safety cabinet needs to be achieved by controlling the air valve at the port of the ventilation duct. The ventilation duct in the prior art is usually rectangular, and the air valve is usually a spherical valve. During the installation process, a reducer needs to be added for connection, which makes the installation process complicated. Secondly, the opening and closing movement trajectory of the air valve in the prior art is large, and the installation accuracy is low. Within the limited installation space, the installation conditions are greatly restricted, and the sealing may be poor. Utility Model Content

[0004] Therefore, the technical problem to be solved by the utility model is to overcome the defect in the prior art that the movement trajectory of the wind valve opening and closing is relatively large, resulting in greater difficulty in installation.

[0005] In order to solve the above technical problems, the utility model provides a square valve for filtering ventilation ducts, comprising:

[0006] A support portion, the support portion comprising a rectangular valve body, two opposite surfaces of the rectangular valve body are respectively provided with an air inlet and an air outlet;

[0007] The flip part includes a rotating shaft, a supporting shaft, a first connecting rod and a second connecting rod, the rotating shaft passes through the rectangular valve body, the supporting shaft is arranged in the rectangular valve body, and the axis of the support shaft is parallel to the axis of the rotating shaft; one end of the first connecting rod is hinged to the second connecting rod, the end of the first connecting rod away from the second connecting rod is connected to the rotating shaft, and the end of the second connecting rod away from the first connecting rod is hinged to the supporting shaft; a valve plate is arranged on the axial surface of the support shaft; the rotation of the rotating shaft drives the valve plate to abut against the air outlet.

[0008] In one embodiment of the utility model, the flip part also includes a pair of guide grooves, the two guide grooves are symmetrically arranged on the side walls of the rectangular valve body, and the two ports of the guide grooves are arranged opposite to the air inlet and the air outlet, and the two ends of the support shaft are clamped in the guide grooves.

[0009] In one embodiment of the utility model, bearings are sleeved on both ends of the support shaft, and the bearings are clamped in the guide grooves.

[0010] In one embodiment of the utility model, the flipping part also includes a fixing plate and a guide plate, the fixing plate is arranged in the rectangular valve body, a guide shaft is arranged at the end of the fixing plate, the guide plate is arranged on the side of the valve plate close to the supporting shaft, a guide hole is arranged on the guide plate, and the guide shaft is passed through the guide hole.

[0011] In one embodiment of the utility model, the ports of the air inlet and the air outlet are both provided with flanges, and a plurality of connection holes are circumferentially provided on the flanges.

[0012] In one embodiment of the present invention, the area of ​​the valve plate is larger than the area of ​​the air outlet.

[0013] In an embodiment of the present utility model, a sealing ring is provided on one side of the air outlet that is in contact with the valve plate, and the sealing ring is provided with a taper.

[0014] In one embodiment of the present invention, a driving unit is further included, wherein the driving unit includes a driving source, and an output end of the driving source is connected to the rotating shaft.

[0015] In one embodiment of the utility model, a driving hand wheel is also provided on the driving source.

[0016] A biological safety protection device comprises the square valve used for filtering ventilation ducts.

[0017] The above technical solution of the utility model has the following advantages compared with the prior art:

[0018] The utility model is a square valve used for filtering ventilation ducts and biosafety protection equipment. The rectangular valve body can facilitate the connection of square air ducts. The rotation of the double-link mechanism drives the valve plate to flip, which can reduce the rotation torque. The rotation range of the entire valve plate is small, which can reduce the installation space of the entire valve body and adapt to various installation environments. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] In order to make the content of the utility model easier to understand, the utility model is further described in detail according to the specific embodiments of the utility model in combination with the accompanying drawings, wherein

[0020] Figure 1 It is a schematic diagram of the overall structure of the utility model;

[0021] Figure 2 for Figure 1 Schematic diagram of the internal structure of the middle support part;

[0022] Figure 3 for Figure 2 A cross-sectional view of the internal structure of the middle rectangular valve body;

[0023] Figure 4 for Figure 1 A schematic diagram of the structure of the middle flip part;

[0024] Figure 5 for Figure 1 The structural diagram of the middle drive unit;

[0025] Explanation of the reference numerals in the specification: 1. Support part; 2. Flip part; 3. Driving part; 4. Sealing ring; 11. Rectangular valve body; 12. Air inlet; 13. Air outlet; 14. Flange; 15. Connecting hole; 21. Rotating shaft; 22. Support shaft; 23. First connecting rod; 24. Second connecting rod; 25. Valve plate; 26. Guide groove; 27. Bearing; 28. Fixed plate; 29. ​​Guide plate; 31. Driving source; 32. Driving hand wheel; 291. Guide hole; 292. Guide shaft. DETAILED DESCRIPTION

[0026] The present invention will be further described below in conjunction with the accompanying drawings and specific embodiments so that those skilled in the art can better understand the present invention and implement it, but the embodiments are not intended to limit the present invention.

[0027] Reference Figure 1-Figure 5 As shown, the utility model discloses a square valve used for filtering ventilation ducts, comprising:

[0028] A support portion 1, the support portion 1 comprising a rectangular valve body 11, two opposite surfaces of the rectangular valve body 11 are respectively provided with an air inlet 12 and an air outlet 13;

[0029] The flip part 2 includes a rotating shaft 21, a supporting shaft 22, a first connecting rod 23 and a second connecting rod 24, the rotating shaft 21 is passed through the rectangular valve body 11, the supporting shaft 22 is arranged in the rectangular valve body 11, and the axis of the support shaft 22 is parallel to the axis of the rotating shaft 21; one end of the first connecting rod 23 is hinged to the second connecting rod 24, the end of the first connecting rod 23 away from the second connecting rod 24 is connected to the rotating shaft 21, and the end of the second connecting rod 24 away from the first connecting rod 23 is hinged to the support shaft 22; a valve plate 25 is arranged on the axial surface of the support shaft 22; the rotation of the rotating shaft 21 drives the valve plate 25 to abut against the air outlet 13.

[0030] It can be imagined that the shape of the entire valve body is rectangular, which is convenient for connection with a square air duct. The interior of the rectangular valve body 11 is used to install the entire flip structure. The first connecting rod 23 and the second connecting rod 24 in the flip part 2 are hinged to form a double connecting rod structure. The first connecting rod 23 is connected to the rotating shaft 21, and the rotating shaft 21 is inserted into the rectangular valve body 11. The rectangular valve body 11 serves as a support. The rotating shaft 21 drives the first connecting rod 23 to move. The second connecting rod 24 is hinged to the first connecting rod 23, and then drives the second connecting rod 24 to move synchronously; secondly, the second connecting rod 24 is connected to the support shaft 22, and the support shaft 22 can move in the rectangular valve seat. The rotation of the second connecting rod 24 drives the support shaft 22 to rotate. The valve plate 25 is set on the support shaft 22, and the rotation of the support shaft 22 drives the valve plate 25 to flip. The valve plate 25 is arranged in the rectangular valve body 11, and the valve plate 25 is arranged on the side close to the air outlet 13. When the rotating shaft 21 is rotated, the double connecting rod mechanism drives the valve plate 25 to flip, so that the valve plate 25 abuts against the air outlet 13, thereby realizing the on-off of the entire rectangular valve seat.

[0031] The rectangular valve body 11 in the utility model can facilitate the connection of the square air duct. The rotation of the double-link mechanism drives the valve plate 25 to flip, which can reduce the rotation torque. The rotation range of the entire valve plate 25 is small, which can reduce the installation space of the entire valve body and adapt to various installation environments.

[0032] Furthermore, the flip portion 2 also includes a pair of guide grooves 26, the two guide grooves 26 are symmetrically arranged on the side wall of the rectangular valve body 11, and the two ends of the guide grooves 26 are arranged opposite to the air inlet 12 and the air outlet 13, and the two ends of the support shaft 22 are clamped in the guide grooves 26.

[0033] Specifically, during the actual operation, while the rotating shaft 21 is rotated, the double-link mechanism drives the support shaft 22 to move, and the support shaft 22 is limited by the guide grooves 26 on both sides, so that the support shaft 22 reciprocates along the guide grooves 26 .

[0034] Furthermore, bearings 27 are sleeved on both ends of the support shaft 22 , and the bearings 27 are clamped in the guide groove 26 .

[0035] Specifically, both ends of the support shaft 22 are clamped in the guide groove 26 , and the bearings 27 are installed at both ends of the support shaft 22 . The support shaft 22 drives the bearings 27 to rotate in the guide groove 26 , thereby reducing the resistance to the movement of the support shaft 22 .

[0036] Furthermore, the flip part 2 also includes a fixed plate 28 and a guide plate 29, the fixed plate 28 is arranged in the rectangular valve body 11, a guide shaft 292 is arranged at the end of the fixed plate 28, the guide plate 29 is arranged on the side of the valve plate 25 close to the support shaft 22, a guide hole 291 is arranged on the guide plate 29, and the guide shaft 292 is passed through the guide hole 291.

[0037] Specifically, the guide plate 29 is directly connected to the valve plate 25. The guide hole 291 on the guide plate 29 is used to limit the movement trajectory of the valve plate 25. The shape of the guide hole 291 is the same as the movement trajectory of the valve plate 25. One section of the long hole cooperates with the double-link mechanism to realize the retreat and advance movement of the valve plate 25, that is, the movement of the valve plate 25 approaching and leaving the air outlet 13. The other half of the guide hole 291 is an arc hole, and the entire arc is 90°. The double-link mechanism is used to make the valve plate 25 flip 90° as a whole. When the valve plate 25 is in the extreme position, the valve plate 25 is set perpendicular to the air outlet 13, and the opening of the valve plate 25 is the largest. Through the setting of the guide hole 291, the movement trajectory of the valve plate 25 is further limited, the accuracy of the movement of the valve plate 25 is guaranteed, and the valve plate 25 can be highly matched with the air outlet 13 to improve the sealing performance.

[0038] Furthermore, the ports of the air inlet 12 and the air outlet 13 are both provided with flanges 14 , and the flanges 14 are circumferentially provided with a plurality of connection holes 15 .

[0039] Specifically, flanges 14 are provided at the two ports of the rectangular valve body 11 for connecting the air duct; as a preferred solution of the utility model, the flange 14 is a rectangular flange 14. During the assembly process, a flange 14 of corresponding size is selected according to the size of the air duct and fixed by bolts.

[0040] Furthermore, the area of ​​the valve plate 25 is larger than the area of ​​the air outlet 13. Specifically, the valve plate 25 needs to block the air outlet 13 during the turning process, and the area of ​​the valve plate 25 needs to be larger than the area of ​​the air outlet 13 to ensure the sealing of the entire valve body.

[0041] Furthermore, a sealing ring 4 is provided on one side of the air outlet 13 that is in contact with the valve plate 25 , and the sealing ring 4 is provided with a taper.

[0042] Specifically, during the closing process, when the valve plate 25 is close to the air outlet 13, the valve plate 25 moves parallel to the air outlet 13, and finally presses the valve plate 25 against the air outlet 13. The sealing ring 4 is arranged between the valve plate 25 and the air outlet 13, and the valve plate 25 presses the sealing ring 4 against the air outlet 13 to ensure the sealing performance of the entire valve body in the closed state. As a preferred embodiment of the present invention, a taper is arranged on the side of the sealing ring 4 away from the air outlet 13 to further improve the sealing performance of the sealing ring 4.

[0043] The sealing ring 4 is connected to the air outlet 13 by glue. Since the material of the sealing ring 4 is different from that of the entire rectangular valve body 11, the glue is amphoteric glue to improve the reliability of bonding. Secondly, since the gas passing through the entire air valve is corrosive, the material of the sealing ring 4 in the utility model is corrosion-resistant and fire-proof material.

[0044] Furthermore, the driving unit 3 is also included, and the driving unit 3 includes a driving source 31, and the output end of the driving source 31 is connected to the rotating shaft 21. The driving source 31 is also provided with a driving hand wheel 32.

[0045] Specifically, the driving source 31 in the utility model adopts a manual-automatic actuator, which uses planetary gears and a worm gear set inside, has an automatic locking function, can effectively prevent slipping caused by gear clearance, and provide a stable and powerful driving mechanism. The handwheel and motor drive do not interfere with each other during movement.

[0046] Embodiment 2

[0047] A biosafety protection device includes the square valve used for filtering ventilation ducts as described in the first embodiment.

[0048] In summary, the utility model introduces a square valve used in filtering ventilation ducts and biosafety protection equipment. It uses a multi-link mechanism to drive the opening and closing of the valve plate 25, which can reduce the required torque and reduce the installation space; the limit mechanism and the guide mechanism can achieve a specific trajectory and perform precise positioning control; secondly, a conical sealing ring 4 is provided between the valve plate 25 and the air outlet 13, and the valve plate 25 can press the conical sealing ring 4 against the air outlet 13 to ensure the sealing effect of the entire valve body. Finally, the driving source 31 adopts a manual-automatic actuator, which uses planetary gears and worm gear sets inside, has an automatic locking function, can effectively prevent slipping caused by gear clearance, and provide a stable and powerful driving mechanism. During the movement, the handwheel and the motor drive do not interfere with each other.

[0049] Obviously, the above embodiments are merely examples for the purpose of clear explanation and are not intended to limit the implementation methods. For those skilled in the art, other different forms of changes or modifications can be made based on the above description. It is not necessary and impossible to list all the implementation methods here. The obvious changes or modifications derived therefrom are still within the scope of protection of the invention of the utility model.

Claims

1. A square valve used in filtering ventilation ducts, characterized in that: include: A support portion, the support portion comprising a rectangular valve body, two opposite surfaces of the rectangular valve body are respectively provided with an air inlet and an air outlet; The flip part includes a rotating shaft, a supporting shaft, a first connecting rod and a second connecting rod, the rotating shaft passes through the rectangular valve body, the supporting shaft is arranged in the rectangular valve body, and the axis of the support shaft is parallel to the axis of the rotating shaft; one end of the first connecting rod is hinged to the second connecting rod, the end of the first connecting rod away from the second connecting rod is connected to the rotating shaft, and the end of the second connecting rod away from the first connecting rod is hinged to the supporting shaft; a valve plate is arranged on the axial surface of the support shaft; the rotation of the rotating shaft drives the valve plate to abut against the air outlet.

2. The square valve for filtering ventilation duct according to claim 1, characterized in that: The flip part also includes a pair of guide grooves, the two guide grooves are symmetrically arranged on the side wall of the rectangular valve body, and the two ends of the guide grooves are arranged opposite to the air inlet and the air outlet, and the two ends of the support shaft are clamped in the guide grooves.

3. The square valve used in filtering ventilation duct according to claim 2, characterized in that: Bearings are sleeved on both ends of the support shaft, and the bearings are clamped in the guide grooves.

4. The square valve used for filtering ventilation duct according to claim 1, characterized in that: The flip part also includes a fixing plate and a guide plate, wherein the fixing plate is arranged in the rectangular valve body, a guide shaft is arranged at the end of the fixing plate, the guide plate is arranged on a side of the valve plate close to the supporting shaft, a guide hole is arranged on the guide plate, and the guide shaft is passed through the guide hole.

5. The square valve used in filtering ventilation duct according to claim 1, characterized in that: The ports of the air inlet and the air outlet are both provided with flanges, and a plurality of connection holes are circumferentially provided on the flanges.

6. The square valve used in filtering ventilation duct according to claim 1, characterized in that: The area of ​​the valve plate is larger than the area of ​​the air outlet.

7. The square valve used in filtering ventilation duct according to claim 1, characterized in that: A sealing ring is arranged on one side of the air outlet that is in contact with the valve plate, and the sealing ring is provided with a taper.

8. The square valve used in filtering ventilation duct according to claim 1, characterized in that: It also includes a driving unit, which includes a driving source, and an output end of the driving source is connected to the rotating shaft.

9. The square valve used in filtering ventilation duct according to claim 8, characterized in that: The driving source is also provided with a driving hand wheel.

10. A biosafety protection device, characterized in that: It comprises a square valve used in a filtering ventilation duct as described in any one of claims 1 to 9.

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