A new check valve

Abstract

The utility model provides a new -type check valve relates to the flue check valve technical field. The check valve includes the valve body and the rotation cover plate that is connected in the valve body, still includes: the inclined plate, the inclined plate is fixedly connected in the valve body in the inclination, the high end of the inclined plate is close to the air inlet side of valve body and sets up, the top edge rotation cover plate is connected in the exhaust side of the inclined plate of the inclination, and is used for the conduction or the plugging of the inclined plate, the counterweight, the counterweight is installed on the top edge of the rotation cover plate, when the plugging state, the counterweight and the gravity center of the rotation cover plate are close to the exhaust side of the top edge of the rotation cover plate respectively, when the complete conduction state, the counterweight and the gravity center of the rotation cover plate are along the ventilation direction setting respectively. The application can long guarantee the leakproofness, and effectively improve the exhaust efficiency.

Description

Technical Field

[0001] This utility model relates to the field of flue gas backflow preventer technology, and in particular to a novel backflow preventer. Background Technology

[0002] A check valve is installed at the flue to prevent flue gas from entering the residence. Existing check valves have a torsion spring installed at the point where the rotating cover and valve body rotate. The torsion spring closes the valve and wind pressure overcomes the spring force to open the rotating cover. After prolonged use, the spring force weakens, creating a gap between the rotating cover and the valve body, allowing fumes from the flue to enter the residence. Furthermore, the larger the opening angle of the rotating cover, the greater the wind pressure required to overcome the torsion spring force. However, when the wind pressure is low, the rotating cover opening is immediately reduced by the torsion spring, affecting the smoke extraction efficiency.

[0003] Therefore, there is an urgent need for a new type of check valve that can guarantee a long-term seal and effectively improve smoke extraction efficiency. Utility Model Content

[0004] The purpose of this utility model is to provide a novel check valve that solves the technical problem of poor sealing in existing check valves, which affects smoke extraction efficiency. The various technical effects of the preferred technical solution among the many technical solutions provided by this utility model are detailed below.

[0005] To achieve the above objectives, the present invention provides the following technical solution:

[0006] This utility model provides a novel check valve, comprising a valve body and a rotating cover plate rotatably connected to the valve body, and further comprising:

[0007] An inclined plate is fixedly connected to the valve body at an inclination. The high end of the inclined plate is located near the air inlet side of the valve body. The top edge of the rotating cover is rotatably connected to the air outlet side of the inclined plate and is used to open or close the inclined plate.

[0008] A counterweight is installed on the top edge of the rotating cover. In the blocked state, the center of gravity of the counterweight and the rotating cover are respectively close to the exhaust side of the top edge of the rotating cover; in the fully open state, the center of gravity of the counterweight and the rotating cover are respectively set along the ventilation direction.

[0009] Preferred options also include:

[0010] A magnet is fixedly connected to the top of the inner wall of the valve body and located on the exhaust side of the inclined plate. In the blocked state, the counterweight and the magnet are magnetically attracted to each other. In the open state, the counterweight and the magnet are separated by the air pressure on the air inlet side of the inclined plate.

[0011] Preferred options also include:

[0012] A ventilation opening is provided at the lower end of the inclined plate, and a rotating cover is provided on the exhaust side of the ventilation opening to guide or block the ventilation opening.

[0013] Preferred options also include:

[0014] The second sealing strip is installed on the air inlet side of the rotating cover and is positioned corresponding to the edge of the vent.

[0015] Preferably, the valve body includes:

[0016] A base, which is fixedly connected to the indoor flue and is provided with a first sealing strip between itself and the indoor flue;

[0017] The pipe body is detachably connected to the base, the inclined plate is obliquely fixedly connected to the inner wall of the pipe body, and the magnet is fixedly connected to the base and located inside the pipe body.

[0018] Preferably, the valve body further includes:

[0019] The mounting ring is coaxially fixedly connected to the inlet of the main pipe body and communicates with the corrugated pipe on the range hood.

[0020] Preferably, the valve body further includes:

[0021] Limiting ports, a plurality of the aforementioned limiting ports are circumferentially opened at the exhaust end of the main body of the pipe;

[0022] A plurality of the limiting protrusions are circumferentially formed on the inner sidewall of the base and are correspondingly engaged in the limiting opening.

[0023] Preferably, the limiting port is configured as an L-shaped opening, and the limiting protrusion is engaged into the limiting port by manually pushing and rotating the pipe body.

[0024] Preferred options also include:

[0025] Two sets of fixing blocks are respectively fixedly connected to the exhaust end of the base;

[0026] A fastening plate is located inside the indoor flue and is fixedly connected to the fixing block by a fastening rope.

[0027] Preferably, the fastening piece includes:

[0028] Curved sheet;

[0029] Two sets of U-shaped blocks are symmetrically fixed at one end to the two ends of the arc-shaped piece and are correspondingly arranged to the inner side wall of the indoor flue. The fastening rope is tied to the U-shaped blocks.

[0030] In the technical solution provided by this utility model, a rotating cover plate is installed on an inclined plate. Its main function is to seal the inclined plate (i.e., close the valve body) using the weight of the rotating cover plate itself. Combined with the weight of the counterweight, the rotating cover plate seals the inclined plate through the combined weight of the counterweight and the rotating cover plate, resulting in better sealing between the rotating cover plate and the inclined plate. This sealing performance is not affected over time, improving durability. In the energized state, the centers of gravity of the counterweight and the rotating cover plate are respectively set along the ventilation direction. Before energization, when the range hood starts and generates wind pressure, it pushes the rotating cover plate... The rotating cover plate rotates, simultaneously overcoming the gravity of both the counterweight and the rotating cover plate, thus initiating ventilation. As the counterweight moves from the exhaust side to the intake side of the top edge of the rotating cover plate, the centers of gravity of the counterweight and the rotating cover plate are aligned with the ventilation direction. This continues until the counterweight contacts the exhaust side of the inclined plate, at which point the rotating cover plate is horizontally positioned and fully ventilated. As long as the oil fume pressure exceeds the gravity difference between the counterweight and the rotating cover plate, the rotating cover plate can be pushed open. Even if the oil fume pressure decreases, full ventilation is maintained, effectively improving smoke extraction efficiency. Overall, this application ensures long-term sealing and effectively improves smoke extraction efficiency. Attached Figure Description

[0031] To more clearly illustrate the technical solutions in the embodiments of this utility model or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of this utility model. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0032] Figure 1 This is a schematic diagram of the overall structure of this utility model;

[0033] Figure 2 This is a schematic diagram of the sealing state of this utility model;

[0034] Figure 3 This is a schematic diagram of the fully conductive state of this utility model;

[0035] Figure 4 This is a schematic diagram of the fastening plate structure of this utility model.

[0036] In the diagram: 1-Base; 2-Pipe body; 3-Mounting ring; 4-Limiting port; 5-Fixing block; 6-Limiting protrusion; 7-Rotating cover plate; 8-Mounting hole; 9-First sealing strip; 10-Magnet; 11-Counterweight block; 12-Inclined plate; 13-Second sealing strip; 14-Leveler; 15-Ventilation port; 16-U-shaped block; 17-Arc-shaped piece. Detailed Implementation

[0037] To make the objectives, technical solutions, and advantages of this utility model clearer, the technical solutions of this utility model will be described in detail below. Obviously, the described embodiments are only a part of the embodiments of this utility model, and not all of them. Based on the embodiments of this utility model, all other implementation methods obtained by those skilled in the art without creative effort are within the scope of protection of this utility model.

[0038] refer to Figure 1-4 A specific embodiment of this utility model provides a novel check valve, including a valve body and a rotating cover plate 7 rotatably connected to the valve body, and further including:

[0039] Inclined plate 12 is fixedly connected to the valve body at an inclination. The high end of the inclined plate 12 is located near the air inlet side of the valve body. The top edge of the rotating cover plate 7 is rotatably connected to the air outlet side of the inclined plate 12 and is used to open or close the inclined plate 12. The angle between the inclined plate 12 and the horizontal plane is 30°.

[0040] The counterweight 11 is installed on the top edge of the rotating cover 7. In the blocked state, the center of gravity of the counterweight 11 and the rotating cover 7 are close to the exhaust side of the top edge of the rotating cover 7, and the rotating cover 7 completes the blockage of the inclined plate 12 by the gravity of the counterweight 11 and the rotating cover 7. In the fully open state, the center of gravity of the counterweight 11 and the rotating cover 7 are set along the ventilation direction, the counterweight 11 is in contact with the exhaust side of the inclined plate 12, the rotating cover 7 is set horizontally, and the rotating cover 7 makes the inclined plate 12 fully open by the gravity of the counterweight 11 and the wind pressure from the air inlet side of the inclined plate 12.

[0041] The check valve is installed at the flue to prevent flue gas from entering the residence. In existing check valves, a torsion spring is installed at the rotating part of the valve body where the rotating cover 7 is located. The valve closes by the spring force and opens by wind pressure overcoming the spring force. After long-term use, the spring force weakens, creating a gap between the rotating cover 7 and the valve body, which allows fumes from the flue to enter the residence. At the same time, the larger the opening angle of the rotating cover 7, the greater the wind pressure is required to overcome the spring force. However, when the wind pressure is low, the opening angle of the rotating cover 7 will be immediately reduced by the torsion spring, affecting the smoke exhaust effect. In this application, the rotating cover 7 is installed on the inclined plate 12. Its main function is to seal the inclined plate 12 (i.e., close the valve body) by the weight of the rotating cover 7 itself. Combined with the weight of the counterweight 11, the rotating cover 7 seals the inclined plate 12 through the combined weight of the counterweight 11 and the rotating cover 7. This improves the sealing between the rotating cover 7 and the inclined plate 12, ensuring that the sealing performance is not affected over time and improving durability. In the fully ventilated state, the centers of gravity of the counterweight 11 and the rotating cover 7 are respectively set along the ventilation direction. Before ventilation, the rotating cover is pushed by the wind pressure generated when the range hood is started. 7. Rotation overcomes the gravity of the counterweight 11 and the rotating cover 7, initiating conduction. As the counterweight 11 moves from the exhaust side to the intake side of the top edge of the rotating cover 7, the centers of gravity of the counterweight 11 and the rotating cover 7 are aligned with the ventilation direction. This continues until the counterweight 11 contacts the exhaust side of the inclined plate 12, and the rotating cover 7 is horizontally positioned, entering a fully conductive state. As long as the oil fume pressure exceeds the gravity difference between the counterweight 11 and the rotating cover 7, the rotating cover 7 can be pushed open. Even if the oil fume pressure decreases, the fully conductive state is maintained, effectively improving smoke extraction efficiency. Overall, this application can maintain sealing performance for a long time and effectively improve smoke extraction efficiency.

[0042] Further optimizations to the plan include:

[0043] Magnet 10 is fixedly connected to the top of the inner wall of the valve body and located on the exhaust side of the inclined plate 12. When the valve is blocked, the counterweight 11 and the magnet 10 are magnetically attracted to each other. When the valve is open, the counterweight 11 and the magnet 10 are separated by the air pressure on the air inlet side of the inclined plate 12.

[0044] The main function of the magnet 10 is to generate magnetic attraction between the rotating cover 7 and the counterweight 11 when the rotating cover 7 is in the closed state. Combined with the weight of the counterweight 11 and the rotating cover 7, this further ensures the sealing performance and durability between the rotating cover 7 and the inclined plate 12.

[0045] Further optimizations to the plan include:

[0046] Ventilation opening 15 is located at the lower end of inclined plate 12. Rotary cover plate 7 is correspondingly provided on the exhaust side of ventilation opening 15 and is used to open or block ventilation opening 15.

[0047] When the rotating cover 7 is placed over the vent 15, it is in a blocked state; when the rotating cover 7 is removed from the vent 15, it is in a conductive state; and when the rotating cover 7 is horizontal, it is in a fully conductive state.

[0048] Further optimizations to the plan include:

[0049] The second sealing strip 13 is installed on the air inlet side of the rotating cover 7 and is correspondingly set to the edge of the vent 15.

[0050] When in the blocked state, the second sealing strip 13 is squeezed by the rotating cover plate 7, thereby effectively ensuring the sealing between the rotating cover plate 7 and the vent 15.

[0051] Further optimization of the design, the valve body includes:

[0052] The base 1 is fixedly connected to the indoor flue, and a first sealing strip 9 is provided between the base 1 and the indoor flue;

[0053] The pipe body 2 is detachably connected to the base 1. The inclined plate 12 is inclinedly fixedly connected to the inner wall of the pipe body 2. The magnet 10 is fixedly connected to the base 1 and located inside the pipe body 2.

[0054] The pipe body 2 and the base 1 are detachably connected, which facilitates the replacement of the pipe body 2 and the rotating cover 7 inside the pipe body 2.

[0055] Further optimization of the design includes the following:

[0056] Mounting ring 3 is coaxially fixedly connected to the inlet of the main pipe body 2 and is connected to the corrugated pipe on the range hood.

[0057] Mounting ring 3 adopts a variable diameter structure, which is beneficial for adapting to corrugated pipes of different sizes; it is compatible with corrugated pipes (aluminum foil pipes) of various specifications such as 160 / 180 / 200mm.

[0058] Further optimization of the design includes the following:

[0059] Limiting ports 4, several limiting ports 4 are circumferentially opened at the exhaust end of the main body of the pipeline 2;

[0060] Limiting protrusions 6 are circumferentially formed on the inner side wall of the base 1 and are correspondingly locked in the limiting opening 4.

[0061] By limiting the protrusion 6 within the limiting port 4, the purpose of a stable connection between the pipe body 2 and the base 1 is achieved.

[0062] The scheme was further optimized by setting the limiting port 4 as an L-shaped port. The limiting protrusion 6 was inserted into the limiting port 4 by manually pushing the pipe body 2 axially and rotating it circumferentially.

[0063] The small-diameter end of the limiting protrusion 6 is fixedly connected to the inner wall of the base 1. When the small-diameter end of the limiting protrusion 6 enters the L-shaped opening (i.e., the limiting opening 4), the large-diameter end of the limiting protrusion 6 presses the pipe body 2 against the inner wall of the base 1 until the limiting protrusion 6 moves to the bottom of the L-shaped opening, thereby completing the stable connection between the pipe body 2 and the base 1. By operating the pipe body 2 in the opposite direction, the pipe body 2 and the base 1 can be separated.

[0064] Further optimizations to the plan include:

[0065] Fixing block 5, two sets of fixing blocks 5 are respectively fixedly connected to the exhaust end of the base 1;

[0066] The fastening plate (not marked in the figure) is located inside the indoor flue and is fixedly connected to the fixing block 5 by a fastening rope.

[0067] When installing the base 1, first insert the fastening plate with the fastening rope into the indoor flue, and then hang it on the fixing block 5. Tighten the fastening rope by fixing block 5, thereby installing the base 1 on the outer wall of the indoor flue.

[0068] Further optimization of the solution, the fastening plates include:

[0069] Arc-shaped piece 17;

[0070] U-shaped blocks 16, one end of two sets of U-shaped blocks 16 are symmetrically fixed to both ends of the arc-shaped piece 17, and are set corresponding to the inner side wall of the indoor flue, with fastening ropes tied to the U-shaped blocks 16.

[0071] The main function of the U-shaped block 16 is to facilitate the passage of the fastening rope and to limit the arc-shaped piece 17 to the inner wall of the indoor flue.

[0072] Further optimizations to the plan include:

[0073] Mounting holes 8 are formed on the base 1, and several screws pass through the mounting holes 8 and are fixedly connected to the indoor flue.

[0074] In addition to the above-mentioned method of fixing the base 1 by using the fixing block 5 and the fastening plate, the base 1 can also be fastened to the outer wall of the indoor flue by passing screws through the mounting hole 8, providing another installation method and making it easier for users to choose the appropriate installation method.

[0075] Further optimizations to the plan include:

[0076] Level 14 is installed at the bottom of the pipe body 2 to check whether the pipe body 2 and the base 1 are properly installed on the outer wall of the indoor flue, ensuring the accuracy of the overall check valve installation position. Level 14 is a common bubble level.

[0077] Overall, the opening angle of the rotating cover 7 in this application exceeds 60° (the angle between the rotating cover 7 and the inclined plate 12). The larger the opening angle, the smaller the closing force. By setting the mass of the counterweight 11 and the rotating cover 7, the closing force can be only 1 / 3 of that when fully open, resulting in a significant increase in exhaust volume. The closing force is the force exerted by the rotating cover 7 when it is blocking or has a tendency to block. It is generated by the gravity of the rotating cover 7. When blocked, the closing force is the sum of the mass of the counterweight 11 and the rotating cover 7, and the magnetic force. When fully open, the closing force is the difference in gravity between the rotating cover 7 and the counterweight 11.

[0078] For example, when the counterweight 11 and the rotating cover 7 are used for gravity sealing, the closing force exceeds 50Pa of negative pressure. Combined with the second sealing strip 13, this effectively ensures the sealing performance. When magnetic sealing is added, it can effectively prevent accidental opening under high negative pressure above 50Pa. The air pressure of the oil fume must overcome the magnetic force, the gravity of the counterweight 11 and the rotating cover 7 to open the check valve.

[0079] This application uses a single rotating cover plate 7, which has a simple structure and few parts; at the same time, the appearance of this application is simple, with no superfluous features within the visible range, making it both aesthetically pleasing and practical; it adopts a modular (detachable) assembly, which is simple in structure, easy to assemble, and has low manufacturing costs. This application uses 13800mm 2 Extra-large exhaust port, single-door design, exhaust pipe with an equivalent diameter of 132mm.

[0080] It should be noted that the terms "center," "longitudinal," "lateral," "length," "width," "thickness," "upper," "lower," "front," "rear," "left," "right," "vertical," "horizontal," "top," "bottom," "inner," "outer," "clockwise," and "counterclockwise," etc., used herein to indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings, are used only for the convenience of describing this application and simplifying the description, and do not indicate or imply that the equipment or component referred to must have a specific orientation, or be constructed and operated in a specific orientation, and therefore should not be construed as a limitation on this application. Furthermore, the terms "first," "second," and "third," etc., are used for descriptive purposes only and should not be construed as indicating or implying relative importance.

[0081] In this description, it should also be noted that, unless otherwise explicitly specified and limited, the terms "installation," "connection," and "linking" should be interpreted broadly. For example, they can refer to fixed connections, detachable connections, or integral connections; they can refer to mechanical connections or electrical connections; they can refer to direct connections or indirect connections through an intermediate medium. Those skilled in the art can understand the specific meaning of the above terms in this application based on the specific circumstances.

[0082] The above description is merely a specific embodiment of this utility model, but the protection scope of this utility model is not limited thereto. Any variations or substitutions that can be easily conceived by those skilled in the art within the technical scope disclosed in this utility model should be included within the protection scope of this utility model. Therefore, the protection scope of this utility model should be determined by the protection scope of the claims.

Claims

1. A novel check valve, comprising a valve body and a rotating cover plate (7) rotatably connected to the valve body, characterized in that, Also includes: Inclined plate (12), the inclined plate (12) is fixedly connected to the valve body at an inclination, the high end of the inclined plate (12) is set close to the air inlet side of the valve body, and the top edge of the rotating cover plate (7) is rotatably connected to the air outlet side of the inclined plate (12) and is used to open or block the inclined plate (12). Counterweight (11) is installed on the top edge of the rotating cover (7). When the cover is blocked, the center of gravity of the counterweight (11) and the rotating cover (7) are close to the exhaust side of the top edge of the rotating cover (7). When the cover is fully open, the center of gravity of the counterweight (11) and the rotating cover (7) are respectively set along the ventilation direction.

2. The novel check valve according to claim 1, characterized in that, Also includes: Magnet (10) is fixedly connected to the top of the inner wall of the valve body and located on the exhaust side of the inclined plate (12). When the blockage is in the state, the counterweight (11) and the magnet (10) are magnetically attracted to each other. When the conduction is in the state, the counterweight (11) and the magnet (10) are separated by the air pressure on the air inlet side of the inclined plate (12).

3. The novel check valve according to claim 1, characterized in that, Also includes: Ventilation opening (15) is located at the lower end of the inclined plate (12). The rotating cover plate (7) is correspondingly located on the exhaust side of the ventilation opening (15) and is used to open or block the ventilation opening (15).

4. The novel check valve according to claim 3, characterized in that, Also includes: The second sealing strip (13) is installed on the air inlet side of the rotating cover (7) and is corresponding to the edge of the vent (15).

5. The novel check valve according to claim 2, characterized in that, The valve body includes: The base (1) is fixedly connected to the indoor flue and a first sealing strip (9) is provided between the base (1) and the indoor flue. The pipe body (2) is detachably connected to the base (1), the inclined plate (12) is inclinedly fixedly connected to the inner wall of the pipe body (2), and the magnet (10) is fixedly connected to the base (1) and located inside the pipe body (2).

6. The novel check valve according to claim 5, characterized in that, The valve body also includes: Mounting ring (3) is coaxially fixedly connected to the inlet of the pipe body (2) and communicates with the corrugated pipe on the range hood.

7. The novel check valve according to claim 5, characterized in that, The valve body also includes: Limiting ports (4), a plurality of the limiting ports (4) are circumferentially opened at the exhaust end of the main body of the pipe (2); Limiting protrusions (6) are circumferentially opened on the inner sidewall of the base (1) and are correspondingly locked in the limiting opening (4).

8. The novel check valve according to claim 7, characterized in that, The limiting port (4) is set as an L-shaped port. By manually pushing and rotating the main body of the pipe (2), the limiting protrusion (6) is inserted into the limiting port (4).

9. The novel check valve according to claim 5, characterized in that, Also includes: Fixed blocks (5), the two sets of fixed blocks (5) are respectively fixedly connected to the exhaust end of the base (1); Fastening plate, which is located inside the indoor flue and is fixedly connected to the fixing block (5) by fastening rope.

10. The novel check valve according to claim 9, characterized in that, The fastening piece includes: Arc-shaped piece (17); U-shaped blocks (16), one end of each of the two sets of U-shaped blocks (16) is symmetrically fixed to both ends of the arc-shaped piece (17) and is correspondingly set to the inner side wall of the indoor flue. The fastening rope is tied to the U-shaped blocks (16).

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