Rubber plate check valve with slow closing and silencing structure

Abstract

The utility model relates to valve technical field, concretely relates to a rubber board check valve with slow -closing silencing structure, including check valve main part, both ends of check valve main part are fixedly connected with connecting screw cap, the inside detachable connection of check valve main part has second limit frame, the inside slide connection of second limit frame has first slide column, one end of first slide column is connected with support plate, the side fixed with interval adjusting spare of support plate away from first slide column has rubber valve, through setting up by spacing adjusting spare that limit sleeve, telescopic column and limit adjusting peg constitute, when the spring force attenuation of reset spring appears long -term use, need not to dismantle and replace reset spring, only need to adjust the length of telescopic column in limit sleeve and fix through limit adjusting peg, can change the interval of rubber valve and support plate, and then increase reset spring pressure, ensure that rubber valve can be reset reliably.

Description

Technical Field

[0001] This utility model belongs to the field of valve technology, specifically relating to a rubber plate check valve with a slow-closing and noise-absorbing structure. Background Technology

[0002] Check valves, as valves that control the unidirectional flow of fluids, are widely used in water supply and drainage, HVAC, industrial pipelines, and other fields. Their main function is to prevent backflow of fluid in pipelines to ensure the normal operation of the system. Currently, there are many types of check valves on the market, among which rubber plate check valves are widely used due to their simple structure, low cost, and good sealing performance.

[0003] However, the return spring has a limited lifespan, and its elasticity tends to weaken after prolonged use, making it difficult to reliably reset the rubber valve. Furthermore, matching return springs are not readily available, and even online purchases can involve several days of shipping, potentially causing equipment downtime and disrupting system operation. Additionally, rubber valve discs are often made of a single material, making it difficult to balance high damping and high resilience, resulting in loud noise during closure and a tendency for the sealing effect to deteriorate with use. Utility Model Content

[0004] The purpose of this invention is to overcome the shortcomings of the prior art, such as the easy failure of the return spring due to fatigue under alternating loads, the difficulty of replacement due to inconsistent specifications, and the easy occurrence of water hammer effect when the valve plate closes quickly, which generates impact noise and may damage the pipeline. Thus, a rubber plate check valve with a slow-closing and noise-absorbing structure is realized.

[0005] To achieve the above-mentioned objectives, the technical solution of this utility model is: a rubber plate check valve with a slow-closing and noise-absorbing structure, comprising a check valve body, with connecting nuts fixedly connected to both ends of the check valve body, a second limiting frame detachably connected inside the check valve body, a first sliding column slidably connected inside the second limiting frame, a support plate connected to one end of the first sliding column, a spacing adjustment component fixed to the side of the support plate away from the first sliding column, and a rubber valve connected to the spacing adjustment component.

[0006] In the aforementioned rubber plate check valve with a slow-closing and noise-absorbing structure, a boss for mounting the second limiting frame is fixed at one end of the inner wall of the check valve body. Both ends of the second limiting frame are mounted on the boss. Bolts for fixing the second limiting frame are threaded onto the boss. Grooves that are compatible with the second limiting frame are provided on the other two sides of the boss.

[0007] In the aforementioned rubber plate check valve with a slow-closing and noise-absorbing structure, a return spring is sleeved on the outer circumferential surface of the first sliding column. One end of the return spring abuts against one side of the second limiting frame, and the other end of the return spring abuts against one side of the support plate.

[0008] In the aforementioned rubber plate check valve with a slow-closing and noise-absorbing structure, the spacing adjustment component includes a limiting sleeve and a telescopic column; at least three of the limiting sleeves are evenly distributed and fixed to the other side wall of the support plate, and the telescopic column is slidably connected inside the limiting sleeve. The limiting sleeve is threaded with a limiting adjustment bolt for fixing the telescopic column.

[0009] In the aforementioned rubber plate check valve with a slow-closing and noise-absorbing structure, the other end of the telescopic column is fixed to one side of the rubber valve.

[0010] In the aforementioned rubber plate check valve with a slow-closing and noise-absorbing structure, a first composite layer is adhered to one side wall of the rubber valve, and a second composite layer is adhered to the other side wall of the rubber valve.

[0011] In the aforementioned rubber plate check valve with a slow-closing and noise-absorbing structure, the first composite layer is made of a high-damping rubber composite layer.

[0012] The second composite layer is made of a high-resilience rubber composite layer.

[0013] In the aforementioned rubber plate check valve with a slow-closing and noise-absorbing structure, a second sliding column is fixed on the side of the rubber valve away from the spacing adjustment member, and a first limiting frame is fixed on the other side inside the check valve body. The second sliding column is slidably connected within the first limiting frame.

[0014] In the aforementioned rubber plate check valve with a slow-closing and noise-absorbing structure, a sealing port is fixed on the inner wall of the check valve body, and the inner wall of the rubber valve is adapted to the inner wall of the sealing port.

[0015] Compared with the prior art, the rubber plate check valve with slow-closing and noise-absorbing structure of this utility model has at least the following beneficial effects:

[0016] 1. The rubber plate check valve with a slow-closing and noise-absorbing structure of this utility model, by setting a spacing adjustment component consisting of a limiting sleeve, a telescopic column, and a limiting adjustment bolt, allows the return spring to be adjusted without disassembling or replacing it when its elasticity weakens due to long-term use. Instead, the extension length of the telescopic column within the limiting sleeve is adjusted and fixed by the limiting adjustment bolt, thereby changing the spacing between the rubber valve and the support plate, increasing the return spring pressure, and ensuring reliable return of the rubber valve. Simultaneously, the second limiting frame is constructed with a boss and has a matching groove. After removing the bolts, the second limiting frame can be rotated and removed, facilitating the operation of the spacing adjustment component. This avoids the problems of traditional return spring replacement requiring complete valve disassembly and equipment downtime due to missing matching return springs, ensuring continuous operation of the pipeline system.

[0017] 2. The rubber valve adopts a double-layer composite structure. The first composite layer, a high-damping rubber composite layer, can absorb the impact energy when the valve is closed by utilizing its high damping characteristics, achieving a slow-closing effect. This effectively reduces the noise generated by the impact between the valve disc and the sealing port, while also reducing the damage to the pipeline system caused by water hammer. The second composite layer, a high-resilience rubber composite layer, ensures a tight fit between the rubber valve and the sealing port with its high resilience performance. Even after long-term use, it can maintain a good sealing effect, solving the technical pain point that traditional single-material valve discs cannot simultaneously meet the requirements of noise reduction, slow closing, and reliable sealing. Attached Figure Description

[0018] Figure 1 This is a schematic diagram of the overall structure of this utility model;

[0019] Figure 2 This is a schematic cross-sectional view of the present invention;

[0020] Figure 3 This is a schematic diagram of the installation of the second limiting frame of this utility model;

[0021] Figure 4 This is a cross-sectional schematic diagram of the limiting sleeve of this utility model;

[0022] Figure 5 This is a cross-sectional schematic diagram of the rubber valve of this utility model.

[0023] In the diagram: 1. Check valve body; 2. Connecting nut; 3. Sealing port;

[0024] 4. Rubber valve; 401. First composite layer; 402. Second composite layer; 5. First limiting frame; 6. Second limiting frame; 7. First sliding column; 8. Return spring; 9. Support plate;

[0025] 10. Limiting sleeve; 1001. Telescopic column; 1002. Limiting adjustment bolt;

[0026] 11. Second sliding column; 12. Bolt. Detailed Implementation

[0027] The rubber plate check valve with a slow-closing and noise-absorbing structure of this utility model will be described in more detail below with reference to the accompanying drawings and specific embodiments.

[0028] In the description of this utility model, it should be understood that the terms "upper", "lower", "front", "rear", "left", "right", "top", "bottom", "inner", "outer", etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are only for the convenience of describing this utility model and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this utility model.

[0029] This embodiment discloses a rubber plate check valve with a slow-closing noise-absorbing structure. However, the return spring is prone to fatigue failure due to alternating loads, and inconsistent specifications make replacement difficult. Furthermore, rapid valve plate closure can easily trigger water hammer, generating impact noise and potentially damaging pipelines. (Refer to...) Figures 1-5 It mainly includes a check valve body 1, with connecting nuts 2 fixedly connected to both ends of the check valve body 1, a second limiting frame 6 detachably connected inside the check valve body 1, a first sliding column 7 slidably connected inside the second limiting frame 6, a support plate 9 connected to one end of the first sliding column 7, a spacing adjustment component fixed on the side of the support plate 9 away from the first sliding column 7, and a rubber valve 4 connected to the spacing adjustment component.

[0030] The main components include a check valve body 1, which is connected to an external pipeline at both ends via connecting nuts 2. A detachable second limiting frame 6 provides support and limits for internal components within the check valve body 1. The second limiting frame 6 guides a first sliding post 7 that passes through it, allowing the first sliding post 7 to slide in a preset direction. One end of the first sliding post 7 is connected to a support plate 9, causing the support plate 9 to move synchronously. The side of the support plate 9 away from the first sliding post 7 is connected to a rubber valve 4 via a spacing adjustment component. By adjusting the spacing component, the position of the rubber valve 4 relative to the support plate 9 can be adjusted to suit the working requirements of the check valve.

[0031] Reference Figures 1-3 One end of the inner wall of the check valve body 1 is fixed with a boss for the second limiting frame 6. The two ends of the second limiting frame 6 are mounted on the boss. Bolts 12 for fixing the second limiting frame 6 are threadedly connected to the boss. Grooves that are compatible with the second limiting frame 6 are provided on the other two sides of the boss.

[0032] A boss is provided at one end of the inner wall of the check valve body 1. This boss not only provides support for the second limiting bracket 6 but also positions it. After the two ends of the second limiting bracket 6 are mounted on the boss, they are securely connected by bolts 12 on the boss, preventing displacement of the second limiting bracket 6 during check valve operation. The grooves on the other two sides of the boss match the structure of the second limiting bracket 6. When the second limiting bracket 6 needs to be disassembled, the bolts 12 are removed, and the second limiting bracket 6 is rotated so that its two ends enter the corresponding grooves for easy removal, facilitating maintenance of internal components.

[0033] Reference Figures 1-4A return spring 8 is fitted onto the outer circumferential surface of the first sliding column 7. One end of the return spring 8 abuts against one side of the second limiting frame 6, and the other end of the return spring 8 abuts against one side of the support plate 9. The spacing adjustment component includes a limiting sleeve 10 and a telescopic column 1001. At least three limiting sleeves 10 are evenly distributed and fixed on the other side wall of the support plate 9. The telescopic column 1001 is slidably connected inside the limiting sleeve 10, and a limiting adjustment bolt 1002 for fixing the telescopic column 1001 is threaded onto the limiting sleeve 10. The other end of the telescopic column 1001 is fixed to one side of the rubber valve 4.

[0034] The return spring 8 abuts against the second limit frame 6 and the support plate 9 at both ends, pushing the support plate 9 to drive the rubber valve 4 to complete the opening and closing action. The spacing adjustment component adopts a multi-point evenly distributed design. The limit sleeves 10 are fixed symmetrically on the surface of the support plate 9. Each sleeve has a telescopic column 1001 slidably connected inside. By adjusting the locking position of the limit adjusting bolt 1002, the axial extension length of the telescopic column 1001 can be precisely controlled. This mechanical adjustment structure not only allows users to adjust the initial sealing pressure of the rubber valve 4 according to actual working conditions, but also allows the return spring 8 to...

[0035] When fatigue occurs, the loss of elastic force is compensated by increasing the extension of the telescopic column 1001, thereby extending the service life of the check valve. The rigid connection between the end of the telescopic column 1001 and the rubber valve 4 ensures the directness of power transmission, enabling the adjustment action to be efficiently converted into the displacement change of the valve plate, ultimately achieving dynamic optimization of sealing performance.

[0036] Reference Figures 1-5 A first composite layer 401 is adhered to one side wall of the rubber valve 4, and a second composite layer 402 is adhered to the other side wall of the rubber valve 4. The first composite layer 401 is made of a high-damping rubber composite layer; the second composite layer 402 is made of a high-resilience rubber composite layer.

[0037] A second sliding column 11 is fixed on the side of the rubber valve 4 away from the spacing adjustment component, and a first limiting frame 5 is fixed on the other side inside the check valve body 1. The second sliding column 11 is slidably connected inside the first limiting frame 5. A sealing port 3 is fixed on the inner wall of the check valve body 1, and the inner wall of the rubber valve 4 is adapted to the inner wall of the sealing port 3.

[0038] The high resilience of the second composite layer 402 ensures that the valve plate quickly returns to its original position under the force of the return spring 8, maintaining the sealing contact pressure. This material property matching gives the rubber valve 4 both impact buffering and rapid response capabilities. The guide system formed by the second sliding column 11 and the first limit frame 5 adopts a precision sliding fit. The surface of the sliding column is hardened to reduce frictional resistance. Its axial layout and the guide groove of the limit frame form a multi-directional constraint, ensuring that the rubber valve 4 maintains vertical displacement during opening and closing, avoiding uneven wear of the sealing surface due to skew. The inner wall of the sealing port 3 adopts a gradient curved surface design, which dynamically adapts to the flexible lip of the outer edge of the rubber valve 4. When the fluid pressure changes, the rubber valve 4 automatically compensates for the sealing gap through elastic deformation. This non-rigid contact method can ensure sealing reliability under low-pressure conditions and adapt to the structural deformation requirements under high-pressure impact.

[0039] The first composite layer 401 adopts a high-damping rubber composite layer structure. When its molecular chain segments are subjected to fluid impact, they can consume vibration energy through internal friction, effectively suppressing the impact vibration at the moment of valve plate closure and reducing the pressure peak caused by water hammer effect. At the same time, its special filler formula can improve the material's internal friction factor, so that the impact energy is converted into heat energy for efficient attenuation. The second composite layer 402's high-resilience rubber composite layer achieves rapid deformation recovery through cross-linked network design. Under the action of the reset spring force, it can quickly push the valve plate back to its position. Its low compression set characteristics ensure that the initial sealing pressure can still be maintained after long-term use.

[0040] The working principle of the rubber plate check valve with slow-closing and noise-absorbing structure of this utility model is as follows: First, the main body 1 of the check valve is connected to the external pipeline or equipment to be connected by threaded sealing through the integrated connecting nuts 2 at both ends, thus completing the overall installation and positioning of the valve body.

[0041] On the pre-set boss on the inner side wall of the check valve body 1, the two ends of the second limiting frame 6 are respectively supported on the top surface of the boss, at which time the second limiting frame 6 is in contact with the top surface of the boss; then the bolt 12 is screwed into the pre-set threaded hole of the boss, and the second limiting frame 6 is pressed by the end of the bolt 12 to achieve rigid fixation of the second limiting frame 6; and the grooves opened on both sides of the boss are in clearance fit with the outer shape of the end of the second limiting frame 6, providing a positioning channel for the subsequent disassembly of the second limiting frame 6.

[0042] When liquid is transported through the external pipeline, the liquid flows in along the inlet end of the check valve body 1 and acts on the outer wall of the rubber valve 4:

[0043] The liquid pressure overcomes the initial preload of the return spring 8 and pushes the rubber valve 4 to move toward the outlet end; at this time, the inner wall of the rubber valve 4 synchronously drives the second sliding column 11 to slide axially along the inner hole of the first limit frame 5.

[0044] The rubber valve 4 drives the support plate 9 to move towards the second limit frame 6 through the fixedly connected spacing adjustment component; the support plate 9 synchronously drives the first sliding column 7 to slide axially along the inner hole of the second limit frame 6; as the support plate 9 moves, the return spring 8 sleeved on the outer periphery of the first sliding column 7 is compressed; when the rubber valve 4 moves to the point of disengagement from the sealing port 3, an annular flow channel is formed between the rubber valve 4 and the sealing port 3, and the liquid flows out from the main body outlet end along the flow channel to achieve normal transportation.

[0045] When the external pipeline stops supplying liquid, the thrust of the liquid on rubber valve 4 disappears:

[0046] The return spring 8 releases its compressed energy, generating an axial return force. This force acts on the support plate 9 and pushes it to move away from the second limit frame 6.

[0047] The support plate 9 moves the rubber valve 4 toward the inlet end through the spacing adjustment component; at the same time, the second sliding column 11 slides in the opposite direction along the inner hole of the first limit frame 5, continuously providing guidance for the rubber valve 4; until the inner wall of the rubber valve 4 is completely in contact with the inner wall of the sealing port 3, forming a rigid sealing surface, blocking the backflow path of liquid from the outlet end to the inlet end, and realizing the check function.

[0048] When the preload of the return spring 8 decreases due to long-term use, resulting in a decline in the check seal effect...

[0049] First, loosen and remove the bolt 12 on the boss. Then, rotate the second limiting bracket 6 around the axis so that its two ends are aligned with the grooves on both sides of the boss. Then, pull out the second limiting bracket 6 along the axis. Simultaneously, pull out the first sliding column 7, the return spring 8, the support plate 9, the spacing adjustment component, and the rubber valve 4 that cooperate with the second limiting bracket 6.

[0050] Loosen the limit adjustment bolt 1002 on the limit sleeve 10, push the telescopic column 1001 to move axially along the inner hole of the limit sleeve 10, and increase the length of the telescopic column 1001 extending out of the limit sleeve 10 (that is, increase the distance between the rubber valve 4 and the support plate 9); after the adjustment is completed, tighten the limit adjustment bolt 1002 again.

[0051] The adjusted components are reinstalled into the main body, so that the second sliding column 11 is inserted into the inner hole of the first limiting frame 5; then the end of the second limiting frame 6 is aligned with the groove of the boss and placed in, the limiting frame is rotated until it fits against the top surface of the boss, and the bolt 12 is tightened to complete the fixation; at this time, because the length of the telescopic column 1001 increases, the initial compression of the return spring 8 increases, the preload is restored, and the check valve sealing performance of the rubber valve 4 is maintained.

[0052] It should be noted that, in actual implementation, the structure depicted in the accompanying drawings is not a fixed or unchanging embodiment. The components of the embodiments of this invention described and shown in these drawings can typically be arranged and designed in various different configurations. Furthermore, the accompanying drawings and abstract drawings are merely illustrative and do not represent the specific structure or actual quantity in a concrete implementation.

[0053] Unless otherwise defined, the technical or scientific terms used herein shall have the ordinary meaning as understood by one of ordinary skill in the art to which this invention pertains. The use of terms such as "a" or "an" in this specification and claims does not necessarily indicate a limitation on quantity. Terms such as "comprising" or "including" mean that the element or component preceding the word encompasses the element or component listed following the word and its equivalents, without excluding other elements or components. Terms such as "connected" or "linked" are not limited to physical or mechanical connections, but may include electrical connections, whether direct or indirect.

[0054] The exemplary embodiments of the present invention have been described in detail above with reference to preferred embodiments. However, those skilled in the art will understand that various modifications and alterations can be made to the above specific embodiments without departing from the concept of the present invention, and various combinations can be made to the various technical features and structures proposed by the present invention without exceeding the protection scope of the present invention.

Claims

1. A rubber plate check valve with a slow-closing and noise-absorbing structure, comprising a check valve body (1), wherein connecting nuts (2) are fixedly connected to both ends of the check valve body (1), characterized in that: The check valve body (1) is detachably connected to a second limiting frame (6), and the second limiting frame (6) is slidably connected to a first sliding column (7). One end of the first sliding column (7) is connected to a support plate (9), and a spacing adjustment component is fixed on the side of the support plate (9) away from the first sliding column (7). A rubber valve (4) is connected to the spacing adjustment component.

2. The rubber plate check valve with a slow-closing and noise-absorbing structure according to claim 1, characterized in that: One end of the inner wall of the check valve body (1) is fixed with a boss for the second limiting frame (6) to be erected. Both ends of the second limiting frame (6) are erected on the boss. Bolts (12) for fixing the second limiting frame (6) are threadedly connected to the boss. Grooves that are compatible with the second limiting frame (6) are provided on the other two sides of the boss.

3. The rubber plate check valve with a slow-closing and noise-absorbing structure according to claim 1, characterized in that: A return spring (8) is sleeved on the outer periphery of the first sliding column (7). One end of the return spring (8) abuts against one side of the second limiting frame (6), and the other end of the return spring (8) abuts against one side of the support plate (9).

4. The rubber plate check valve with a slow-closing and noise-absorbing structure according to claim 3, characterized in that: The spacing adjustment component includes a limiting sleeve (10) and a telescopic column (1001); at least three of the limiting sleeves (10) are evenly distributed and fixed to the other side wall of the support plate (9), and the telescopic column (1001) is slidably connected inside the limiting sleeve (10), and the limiting sleeve (10) is threaded with a limiting adjustment bolt (1002) for fixing the telescopic column (1001).

5. The rubber plate check valve with a slow-closing and noise-absorbing structure according to claim 4, characterized in that: The other end of the telescopic column (1001) is fixed to one side of the rubber valve (4).

6. The rubber plate check valve with a slow-closing and noise-absorbing structure according to claim 5, characterized in that: A first composite layer (401) is adhered to one side wall of the rubber valve (4), and a second composite layer (402) is adhered to the other side wall of the rubber valve (4).

7. The rubber plate check valve with a slow-closing and noise-absorbing structure according to claim 6, characterized in that: The first composite layer (401) is made of a high-damping rubber composite layer; The second composite layer (402) is made of a high-resilience rubber composite layer.

8. The rubber plate check valve with a slow-closing and noise-absorbing structure according to claim 1, characterized in that: The rubber valve (4) is fixed with a second sliding column (11) on the side away from the spacing adjustment member, and a first limiting frame (5) is fixed on the other side inside the check valve body (1). The second sliding column (11) is slidably connected inside the first limiting frame (5).

9. The rubber plate check valve with a slow-closing and noise-absorbing structure according to claim 1, characterized in that: The inner wall of the check valve body (1) is fixed with a sealing port (3), and the inner wall of the rubber valve (4) is adapted to the inner wall of the sealing port (3).

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