A backflow-preventing ventilation tube check valve structure

Abstract

The utility model relates to the technical field of check valve, concretely to a prevent backwash's ventilation tube check valve structure, including valve body, both ends of valve body are all installed ventilation tube through flange plate, the bottom end rotationally connected with control shaft of valve body, and the both sides of control shaft all are established and installed groove, one side inner wall of installation groove is inlayed and installed with magnet plate, and the position of two other side inner walls of installation groove is close to the bottom end all through bearing and one end of rotating shaft is installed, and the outer surface of rotating shaft all installs control valve plate. Through installation groove, magnet plate, rotating shaft, control valve plate, sliding rod, iron piece, magnet bar, handheld rod, limit disc, annular groove, bottom disc, gap, support rod and rubber block etc. spare and parts setting can effectively solve the existing check valve in the use process and close state are all once adjustment, after the adjustment is completed, and will not frequently repeatedly adjust operation, and the existing control valve plate all are outward unfolding and are fixed setting, thereby can occupy unnecessary space problem.

Description

Technical Field

[0001] This utility model relates to the field of check valve technology, specifically to a check valve structure for a ventilation duct that prevents backflow. Background Technology

[0002] A check valve is a type of valve whose opening and closing element is a circular valve disc, which relies on its own weight and the pressure of the medium to prevent backflow. It belongs to the category of automatic valves and is also known as a non-return valve, one-way valve, reflux valve, or isolation valve. The valve disc movement can be either lift-type or swing-type.

[0003] During the installation of ventilation ducts, a check valve is installed between two sets of ventilation ducts to prevent backflow of air. The opening and closing state of the check valve is adjusted only once during use. After the adjustment is completed, it will not be adjusted frequently. However, the existing control valve plates are all outwardly extended and fixed, which occupies unnecessary space. Therefore, the above problems need to be addressed by making corresponding improvements. Utility Model Content

[0004] The purpose of this utility model is to provide a backflow prevention check valve structure for ventilation cylinders to solve the problems mentioned in the background art.

[0005] To achieve the above objectives, this utility model provides the following technical solution: a backflow prevention check valve structure for a ventilation duct, comprising a valve body, with ventilation ducts mounted on both ends of the valve body via flanges; a control shaft rotatably connected to the bottom end of the valve body, with mounting grooves on both sides of the control shaft; a magnet plate embedded in the inner wall of one side of the mounting groove; and bearings mounted on the bottom ends of the inner walls of the other two sides of the mounting groove to one end of the rotating shaft; a control valve plate mounted on the outer surface of the rotating shaft; four sets of sliding rods mounted on both sides of the control valve plate near the outer side of the rotating shaft; an iron block embedded inside the control valve plate, with a magnet rod mounted at the bottom end of each iron block; a limit plate mounted on the inner walls of the other two sides of the mounting groove near the rotating shaft, with an annular groove on one side of each limit plate; a base plate mounted at the bottom end of the control shaft, with notches on both sides of the base plate; and support rods mounted on the top of the base plate near both sides of the notches, with rubber blocks mounted on the top of each support rod.

[0006] Preferably, a hand handle is installed on one side of the bottom of the control valve plate, and the side surface of the hand handle is provided with anti-slip texture near the bottom.

[0007] Preferably, the sliding rods are arranged symmetrically with respect to the center point of the rotation axis, and one end of each sliding rod extends into the interior of the corresponding annular groove and is slidably connected to it.

[0008] Preferably, the inner diameter of the limiting plate is adapted to the outer diameter of the rotating shaft, and the limiting plate is sleeved on one end of the rotating shaft.

[0009] Preferably, the interior of the notch is open on one side and curved on the other side.

[0010] Preferably, the outer surface curvature of the magnet rod is adapted to the curvature of the notch arc surface, and the outer surface of the magnet rod and the arc surface of the notch are fitted together and attracted and fixed to each other.

[0011] Preferably, a valve is installed at the top of the control shaft, and the valve is located inside the valve body.

[0012] Compared with the prior art, the beneficial effects of this utility model are:

[0013] By incorporating components such as mounting slots, magnetic plates, rotating shafts, control valve plates, sliding rods, iron blocks, magnetic bars, handheld rods, limit discs, annular grooves, chassis, notches, support rods, and rubber blocks, the existing check valves can be effectively configured to address the issue that their opening and closing states are adjusted only once during use, eliminating the need for frequent adjustments. Furthermore, the existing control valve plates are typically outward-expanding and fixed, thus occupying unnecessary space. Attached Figure Description

[0014] Figure 1 This is a three-dimensional structural diagram of the main body of this utility model.

[0015] Figure 2 This is a three-dimensional structural diagram of the control shaft of this utility model.

[0016] Figure 3 This is a three-dimensional structural diagram of the control valve plate of this utility model.

[0017] Figure 4 This is a three-dimensional schematic diagram of the connection structure between the limiting plate and the control valve plate of this utility model.

[0018] In the diagram: 1. Valve body; 11. Control shaft; 12. Mounting groove; 13. Magnet plate; 14. Rotating shaft; 15. Control valve plate; 16. Sliding rod; 17. Iron block; 18. Magnet rod; 19. Hand handle; 2. Limiting plate; 21. Annular groove; 3. Chassis; 31. Notch; 32. Support rod; 33. Rubber block. Detailed Implementation

[0019] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the protection scope of the present utility model.

[0020] To achieve the above objectives, according to Figures 1-4 As shown, this utility model provides the following technical solution: a backflow prevention check valve structure for ventilation ducts, including a valve body 1. Ventilation ducts are mounted on both ends of the valve body 1 via flanges. A control shaft 11 is rotatably connected to the bottom end of the valve body 1, and mounting grooves 12 are provided on both sides of the control shaft 11. Since the ventilation ducts are all installed on the ceiling, the rotatable connection of the control shaft 11 to the bottom end of the valve body 1 facilitates subsequent rotation of two sets of control valve plates 15 and the control shaft 11 by the user. A valve is installed at the top of the control shaft 11, and the valve is located inside the valve body 1. Rotation of the two sets of control valve plates 15 drives the control shaft 11 to rotate accordingly, thereby driving the valve inside the valve body 1 to rotate, thus controlling the opening and closing state of the valve body 1. A magnet plate 13 is embedded in the inner wall of one side of the mounting groove 12, and the other two sides of the inner wall near the bottom are connected to the rotating shaft via bearings. One end of the rotating shaft 14 is installed with a control valve plate 15 on the outer surface of the rotating shaft 14. Four sets of sliding rods 16 are installed on both sides of the control valve plate 15 near the outer side of the rotating shaft 14. The sliding rods 16 are centrally symmetrical about the center point of the rotating shaft 14. One end of the sliding rods 16 extends into the corresponding annular groove 21 and is slidably connected to it. Iron blocks 17 are embedded in the inside of the control valve plate 15. Magnet rods 18 are installed at the bottom of the iron blocks 17. Hand handles 19 are installed on one side of the bottom of the control valve plate 15. Anti-slip textures are provided on the side surface of the hand handles 19 near the bottom. Limiting plates 2 are installed on the inner walls of the other two sides of the mounting groove 12 near the rotating shaft 14. An annular groove 21 is opened on one side of the limiting plate 2. The inner diameter of the limiting plate 2 is adapted to the outer diameter of the rotating shaft 14. The limiting plate 2 is fitted on one end of the rotating shaft 14.

[0021] A chassis 3 is installed at the bottom of the control shaft 11, and notches 31 are provided on both sides of the chassis 3. The interior of the notch 31 is open on one side and curved on the other side. The curvature of the outer surface of the magnet rod 18 matches the curvature of the curved surface of the notch 31, and the outer surface of the magnet rod 18 is attached to the curved surface of the notch 31 and is attracted and fixed to each other. Support rods 32 are installed on both sides of the top of the chassis 3 near the notch 31, and rubber blocks 33 are installed on the top of the support rods 32.

[0022] In the initial state, the control valve plate 15 is housed inside the mounting slot 12, and one side of the control valve plate 15 is adhered and fixed to one side of the iron block 17. When it is necessary to change the valve body 1 from the closed state to the open state, the user can hold the handle 19 and rotate the control valve plate 15 around the rotating shaft 14, so that one side of the iron block 17 can separate from one side of the magnet plate 13, allowing one end of the four sets of sliding rods 16 to slide inside the annular groove 21. This makes the control valve plate 15 more stable and less prone to shaking when rotating. When the two sets of control valve plates 15 are rotated to the horizontal state, the bottom ends of the two sets of control valve plates 15 will respectively overlap with the top ends of the corresponding two sets of rubber blocks 33. Thus, under the action of the corresponding two sets of support rods 32 and the corresponding two sets of rubber blocks 33, the corresponding control valve plate 15 can be adjusted. The support 5 provides support, ensuring the control valve plate 15 remains horizontal. Simultaneously, the magnetic rod 18 rotates into the notch 31, allowing its outer surface to align with the arc-shaped surface inside the notch 31 for adhesion and fixation. The notch 31 then limits the magnetic rod 18, completing the fixation between the control valve plate 15 and the chassis 3. Afterward, rotating the two sets of control valve plates 15 rotates the control shaft 11, causing the valve inside the valve body 1 to rotate, thus changing the valve body 1 from a closed to an open state. Conversely, rotating the two sets of control valve plates 15 into their corresponding mounting slots 12 allows for storage and space saving.

[0023] Although embodiments of the present invention have been shown and described, it will be understood by those skilled in the art that various changes, modifications, substitutions and alterations can be made to these embodiments without departing from the principles and spirit of the present invention, the scope of which is defined by the appended claims and their equivalents.

Claims

1. A backflow prevention check valve structure for a ventilation duct, comprising a valve body (1), wherein ventilation ducts are mounted on both ends of the valve body (1) via flanges, characterized in that: The bottom end of the valve body (1) is rotatably connected to a control shaft (11), and mounting grooves (12) are provided on both sides of the control shaft (11). A magnet plate (13) is embedded in the inner wall of one side of the mounting groove (12), and the bottom ends of the other two sides of the mounting groove (12) are connected to one end of the rotating shaft (14) via bearings. A control valve plate (15) is installed on the outer surface of the rotating shaft (14), and four sets of sliding rods (16) are installed on both sides of the control valve plate (15) near the outer side of the rotating shaft (14). The interior of the control valve plate (15) is... An iron block (17) is embedded in the mounting groove (12), and a magnetic rod (18) is installed at the bottom of each iron block (17). A limit plate (2) is installed on the inner wall of the other two sides of the mounting groove (12) near the end of the rotating shaft (14), and an annular groove (21) is opened on one side of each limit plate (2). A base plate (3) is installed at the bottom of the control shaft (11), and a notch (31) is opened on both sides of the base plate (3). A support rod (32) is installed on both sides of the top of the base plate (3) near the notch (31), and a rubber block (33) is installed on the top of the support rod (32).

2. The anti-backflow check valve structure for a ventilation duct according to claim 1, characterized in that: Each of the control valve plates (15) has a hand lever (19) installed on one side of its bottom end, and the side surface of the hand lever (19) is provided with anti-slip texture at the bottom end.

3. The anti-backflow check valve structure for a ventilation duct according to claim 1, characterized in that: The sliding rods (16) are all centrally symmetrically arranged with the center point of the rotating shaft (14) as the center point, and one end of the sliding rod (16) extends into the interior of the corresponding annular groove (21) and is slidably connected to it.

4. The anti-backflow check valve structure for a ventilation duct according to claim 1, characterized in that: The inner diameter of the limiting disk (2) is adapted to the outer diameter of the rotating shaft (14), and the limiting disk (2) is fitted on one end of the rotating shaft (14).

5. The anti-backflow check valve structure for a ventilation duct according to claim 1, characterized in that: The interior of the notch (31) is open on one side, and the interior of the notch (31) is arc-shaped on the other side.

6. The anti-backflow check valve structure for a ventilation duct according to claim 5, characterized in that: The outer surface curvature of the magnet rod (18) is adapted to the curvature of the notch (31), and the outer surface of the magnet rod (18) and the notch (31) are attached to each other and fixed together.

7. The anti-backflow check valve structure for a ventilation duct according to claim 1, characterized in that: A valve is installed at the top of the control shaft (11), and the valve is located inside the valve body (1).

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