A non-return seal

Abstract

This utility model relates to the field of check valve technology, specifically a check valve type sealing element, including a main pipe, an inlet end, and an outlet end. A check mechanism is provided on the main pipe, comprising: a protective cover fixedly connected to the main pipe; a return spring on the main pipe, one end of which is fixedly connected to the main pipe, and the other end of which is fixedly connected to a connecting plate; a connecting rod fixedly connected to the connecting plate; and a check plate fixedly connected to the end of the connecting rod away from the connecting plate. The connecting rod is connected to a piston in the main pipe. This utility model incorporates a buffer mechanism. When the water flow is interrupted, a water hammer effect occurs, causing a sudden pressure change in the main pipe. Under pressure, the sealing block moves into the sealed hollow tube, compressing the storage spring. The storage spring absorbs some of the pressure energy, preventing excessive pressure from directly acting on the main pipe and the sealing element, thus mitigating damage caused by the water hammer effect.

Description

Technical Field

[0001] This utility model relates to the field of check valve technology, specifically a check valve type sealing element. Background Technology

[0002] Check valves are sealing components that enable unidirectional flow control, ensuring that the medium in a pipeline system flows in a predetermined direction and preventing backflow. In many systems involving fluid transport, check valves are key components ensuring unidirectional flow. Taking a household water supply system as an example, a check valve acts like a "one-way door," allowing water to flow only in one direction, preventing backflow, and ensuring the normal operation of the entire water supply system.

[0003] However, existing check seals have a significant problem: water hammer occurs when the water flow is suddenly interrupted. This is analogous to a car on a highway experiencing a tremendous impact force due to inertia when it brakes suddenly. In a piping system, when the water flow is suddenly cut off, the high-speed flowing water cannot stop immediately due to inertia, generating a huge impact force on the pipes and seals—the water hammer effect. Water hammer can lead to a series of serious consequences, damaging pipes and seals, reducing their lifespan, increasing maintenance costs and replacement frequency; it can also cause pipe connections to loosen or crack, leading to leaks.

[0004] In view of this, we propose a non-return seal. Utility Model Content

[0005] The purpose of this utility model is to provide a backflow preventer seal that solves the problem that existing backflow preventers can cause water hammer damage to pipelines when the water flow is suddenly interrupted.

[0006] To achieve the above objectives, this utility model provides the following technical solution:

[0007] A check valve type seal includes a main pipe, an inlet end, and an outlet end. A check valve mechanism is provided on the main pipe, comprising: a protective cover fixedly connected to the main pipe; a return spring on the main pipe, one end of which is fixedly connected to the main pipe, and the other end of which is fixedly connected to a connecting plate; a connecting rod fixedly connected to the connecting plate; and a check valve plate fixedly connected to the end of the connecting rod away from the connecting plate, the connecting rod being connected to a piston on the main pipe. A buffer mechanism is provided on the main pipe, comprising: a sealed hollow tube fixedly connected to the main pipe; a sealing block piston-connected to the inner wall of the sealed hollow tube; a storage spring between the sealing block and the inner wall of the sealed hollow tube, one end of which is fixedly connected to the inner wall of the sealed hollow tube, and the other end of which is fixedly connected to the sealing block; and an air jet mechanism on the sealing block for jetting water flow when the sealing block impacts.

[0008] Preferably, the two ends of the main tube are connected to the inlet and the outlet respectively, and the outer wall of the connecting plate is slidably connected to the inner wall of the protective cover.

[0009] Preferably, the jetting mechanism includes a bellows, one end of which is fixedly connected to the inner wall of a sealed hollow tube, and the other end of which is fixedly connected to a sealing block. A one-way output pipe is fixedly connected to the bellows and the inner wall of the sealing block, and a slow-speed throttling pipe is fixedly connected to the bellows and the inner wall of the sealed hollow tube.

[0010] Preferably, the unidirectional output tube includes a unidirectional tube body, the inner wall of the unidirectional tube body is provided with a fixed plate, the fixed plate is provided with a connecting spring, one end of the connecting spring is fixedly connected to the fixed plate, the other end of the connecting spring is fixedly connected to a sealing plate, and a sealing ring is fixedly connected to the inner wall of the unidirectional tube body.

[0011] Preferably, the slow-speed throttling tube includes a throttling tube body, and the inner wall of the throttling tube body is provided with micro-holes.

[0012] Preferably, the protective cover is provided with an observation window, and the edge of the check plate is chamfered.

[0013] Preferably, the check plate is provided with a sealing gasket, and the unidirectional conduction performance of the unidirectional output pipe can be adjusted by adjusting the elastic coefficient of the connecting spring.

[0014] By employing the above technical solution, this utility model provides a backflow preventer seal. It possesses at least the following beneficial effects:

[0015] 1. This utility model incorporates a buffer mechanism. When the water flow is interrupted, a water hammer effect occurs, causing a sudden change in pressure within the main pipe. Under pressure, the sealing block moves into the sealed hollow pipe, compressing the energy storage spring. The energy storage spring absorbs some of the pressure energy, preventing excessive pressure from directly acting on the main pipe and the sealing components, thus mitigating the damage caused by the water hammer effect.

[0016] 2. This utility model incorporates an air jet mechanism. The movement of the sealing block compresses the bellows of the air jet mechanism, increasing the internal gas pressure. The gas is then expelled into the water flow within the main pipe through a one-way output pipe. This air jetting acts like adding a "cushion," buffering the impact of the water flow. Combined with the buffering mechanism, it reduces the water hammer effect through both energy absorption and impact buffering, providing more comprehensive protection for the check seal and piping system, and minimizing damage caused by water hammer. Attached Figure Description

[0017] The accompanying drawings, which are included to provide a further understanding of the present invention, form part of this application:

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

[0019] Figure 2 This is a structural schematic diagram of the main pipe cross-section in this utility model;

[0020] Figure 3 This is a schematic diagram of the cross-sectional structure of the sealing block in this utility model;

[0021] Figure 4 This is a schematic diagram of the unidirectional output tube in this utility model;

[0022] Figure 5 This is a schematic diagram of the cross-sectional structure of the unidirectional output tube in this utility model;

[0023] Figure 6 This is a schematic diagram of the slow-speed throttling tube in this utility model;

[0024] Figure 7 This is a structural schematic diagram of the cross-section of the slow-speed throttling tube in this utility model.

[0025] In the diagram: 1. Main pipe; 2. Inlet end; 3. Outlet end; 4. Check valve mechanism; 41. Protective cover; 42. Return spring; 43. Connecting disc; 44. Connecting rod; 45. Check valve disc; 5. Buffer mechanism; 51. Sealed hollow tube; 52. Sealing block; 53. Energy storage spring; 6. Jet mechanism; 61. Bellows; 62. One-way output pipe; 621. One-way tube body; 622. Fixed disc block; 623. Connecting spring; 624. Sealing disc; 625. Sealing ring; 63. Slow-moving throttling tube; 631. Throttling tube body; 632. Micro-orifice. Detailed Implementation

[0026] 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.

[0027] Please see Figure 1 - Figure 7As shown, this utility model provides a technical solution: a backflow preventer seal, including a main pipe 1, an inlet end 2, and an outlet end 3. A check mechanism 4 is provided on the main pipe 1, comprising: a protective cover 41 fixedly connected to the main pipe 1; a return spring 42 fixedly connected to the main pipe 1 at one end and a connecting plate 43 fixedly connected to the other end; a connecting rod 44 fixedly connected to the connecting plate 43; and a check disc 45 fixedly connected to the end of the connecting rod 44 away from the connecting plate 43. The connecting rod 44 is piston-connected to the main pipe 1. The core function of the check mechanism 4 is to prevent backflow of the medium, ensuring unidirectional flow within the main pipe 1. When the medium flows normally from the inlet end 2 into the main pipe 1 and towards the outlet end 3, the pressure generated by the medium pushes the check disc 45. The check disc 45 is connected to the connecting plate 43 via the connecting rod 44. Under pressure, the check disc 45 drives the connecting rod 44 and the connecting plate 43 to move together, at which point the return spring 42 is compressed. In this way, the channel inside the main pipe 1 is opened, allowing the medium to pass through smoothly. When the water flow stops or a backflow trend occurs, the positive pressure of the medium on the check plate 45 decreases or disappears. The compressed return spring 42 will use its own elastic restoring force to push the connecting plate 43, connecting rod 44 and check plate 45 to move in the opposite direction, so that the check plate 45 returns to its initial position, blocking the channel inside the main pipe 1 to seal it, thereby preventing the medium from flowing back. The protective cover 41 protects the check valve mechanism 4, preventing damage from external impurities and ensuring its normal operation. A buffer mechanism 5 is installed on the main pipe 1. The buffer mechanism 5 includes a sealed hollow tube 51, which is fixedly connected to the main pipe 1. A sealing block 52 is piston-connected to the inner wall of the sealed hollow tube 51. A storage spring 53 is installed between the sealing block 52 and the inner wall of the sealed hollow tube 51. One end of the storage spring 53 is fixedly connected to the inner wall of the sealed hollow tube 51, and the other end is fixedly connected to the sealing block 52. The buffer mechanism 5 is mainly used to mitigate the water hammer effect when the water flow is interrupted. The water hammer effect is caused by the sudden cessation of water flow, resulting in a huge impact force on the pipe and seals due to the inertia of the water flow. When the water flow is interrupted, the pressure inside the main pipe 1 changes suddenly. At this time, the sealing block 52 inside the sealed hollow tube 51 is affected by the pressure change. If the pressure suddenly increases, the sealing block 52 will move into the sealed hollow tube 51 under pressure, compressing the storage spring 53. The function of the storage spring 53 is like a buffer; it absorbs some of the energy from the pressure, preventing excessive pressure from acting directly on the main pipe 1 and the seal, thereby mitigating the water hammer effect. When the pressure decreases, the compressed storage spring 53 gradually returns to its original shape, pushing the sealing block 52 back to its initial position, awaiting the next pressure change.In this way, the buffer mechanism 5 effectively protects the check seal and piping system, reducing the damage caused by water hammer; the sealing block 52 is provided with an air jet mechanism 6, which is used to jet water when the sealing block 52 is impacted.

[0028] The two ends of the main pipe 1 are connected to the inlet end 2 and the outlet end 3 respectively, and the outer wall of the connecting plate 43 is slidably connected to the inner wall of the protective cover 41.

[0029] The jet mechanism 6 includes a bellows 61, one end of which is fixedly connected to the inner wall of a sealed hollow tube 51, and the other end is fixedly connected to a sealing block 52. A one-way output pipe 62 is fixedly connected to the inner wall of the bellows 61 and the sealing block 52, and a slow-speed throttling pipe 63 is fixedly connected to the inner wall of the bellows 61 and the sealed hollow tube 51. When the water flow is interrupted, causing a water hammer effect, the pressure inside the main pipe 1 changes abruptly. Under the pressure, the sealing block 52 moves into the sealed hollow tube 51. Since one end of the bellows 61 is fixed to the inner wall of the sealed hollow tube 51 and the other end is fixed to the sealing block 52, the movement of the sealing block 52 will compress the bellows 61. During the compression of the bellows 61, its internal space decreases, and the gas is squeezed. When the water flow is normal and the pressure is relatively stable, the sealing block 52 is in its initial position, and the bellows 61 is relatively relaxed, at which time a certain amount of gas can be stored. A one-way outlet pipe 62 is connected to the inner wall of the bellows 61 and the sealing block 52, and it has a one-way conduction characteristic. When the bellows 61 is compressed and the internal gas pressure increases, the gas can only be ejected through the one-way outlet pipe 62 to the outside of the sealing block 52, that is, ejected into the water flow in the main pipe 1. Ejecting gas into the water flow can buffer the impact force of the water flow, just like adding a "soft cushion" to the water that is suddenly blocked at high speed, reducing the damage to the pipe and seals caused by the huge impact force of the water hammer effect. A slow-speed throttling pipe 63 is connected to the inner wall of the bellows 61 and the sealed hollow pipe 51. When the sealing block 52 gradually returns to its initial position under the action of the storage spring 53, the bellows 61 expands accordingly, its internal space increases, and the pressure decreases. At this time, external gas will slowly replenish the bellows 61 through the slow-speed throttling pipe 63. The slow-speed throttling pipe 63 acts as a throttling device, making the gas replenishment speed relatively slow, ensuring a smooth gas replenishment process in the bellows 61, avoiding rapid internal pressure changes caused by the rapid return of the sealing block 52, and preparing for the jetting during the next water hammer impact.

[0030] The one-way output pipe 62 includes a one-way pipe body 621. A fixed plate 622 is provided on the inner wall of the one-way pipe body 621. A connecting spring 623 is provided on the fixed plate 622. One end of the connecting spring 623 is fixedly connected to the fixed plate 622, and the other end of the connecting spring 623 is fixedly connected to a sealing plate 624. A sealing ring 625 is fixedly connected to the inner wall of the one-way pipe body 621. Under normal circumstances, that is, when the bellows 61 is not compressed and the internal gas pressure does not increase, the connecting spring 623 will press the sealing plate 624 tightly against the sealing ring 625. The sealing plate 624 and the sealing ring 625 are tightly fitted. When the water flow is cut off and a water hammer effect is generated, the sealing block 52 is pressured and moves into the sealed hollow pipe 51, thereby compressing the bellows 61. The gas inside the bellows 61 is squeezed and the pressure gradually increases. When the gas pressure inside the bellows 61 increases to a certain level, exceeding the pressure of the connecting spring 623 on the sealing disc 624, the pressure generated by the gas will push the sealing disc 624 to overcome the pressure of the connecting spring 623, causing it to separate from the sealing ring 625. At this time, the channel of the one-way output pipe 62 is opened, and the gas inside the bellows 61 can be ejected through the one-way pipe body 621 to the outside of the sealing block 52, that is, to spray air into the water flow in the main pipe 1, so as to reduce the impact force caused by the water hammer effect.

[0031] The slow-speed throttling tube 63 includes a throttling tube body 631, on the inner wall of which are provided micro-holes 632. Due to the obstruction of gas flow by the micro-holes 632, gas does not rush into the bellows 61 in large quantities at once, but enters at a slow and stable speed. This slow replenishment method allows the pressure inside the bellows 61 to gradually increase, which is compatible with the return process of the sealing block 52. The sealing block 52 moves slowly under the push of the storage spring 53, and the space in the bellows 61 gradually increases. The micro-holes 632 control the gas to fill this increased space at an appropriate speed, thereby ensuring the smoothness of the entire gas replenishment process.

[0032] The protective cover 41 is equipped with an observation window to facilitate observation of the operating status of the check mechanism 4 at any time. The edge of the check disc 45 is chamfered to reduce damage to the inner wall of the main pipe 1 and to make the medium flow more smoothly.

[0033] A sealing gasket is provided on the check plate 45, and the unidirectional conduction performance of the one-way output pipe 62 can be adjusted by adjusting the elastic coefficient of the connecting spring 623.

[0034] In the application of this non-return seal, when the water flow is interrupted, the pressure inside the main pipe 1 suddenly changes. At this time, the sealing block 52 inside the sealed hollow tube 51 is affected by the pressure change. If the pressure suddenly increases, the sealing block 52 will move into the sealed hollow tube 51 under pressure, compressing the energy storage spring 53. The energy storage spring 53 acts as a buffer, absorbing some of the pressure energy and preventing excessive pressure from directly acting on the main pipe 1 and the seal, thus mitigating the water hammer effect. When the pressure decreases, the compressed energy storage spring 53 gradually returns to its original shape, pushing the sealing block 52 back to its initial position, awaiting the next pressure change. In this way, the buffer mechanism 5 effectively protects the non-return seal and the piping system, reducing the damage caused by the water hammer effect.

[0035] When the water flow is interrupted, causing a water hammer effect, the pressure inside the main pipe 1 changes abruptly. Under pressure, the sealing block 52 moves into the sealed hollow tube 51. Since one end of the bellows 61 is fixed to the inner wall of the sealed hollow tube 51 and the other end is fixed to the sealing block 52, the movement of the sealing block 52 will compress the bellows 61. During the compression of the bellows 61, its internal space decreases, and the gas is squeezed out. When the water flow is normal and the pressure is relatively stable, the sealing block 52 is in its initial position, and the bellows 61 is relatively relaxed, at which time a certain amount of gas can be stored. The one-way output pipe 62 is connected to the inner wall of the bellows 61 and the sealing block 52, and it has a one-way conduction characteristic. When the bellows 61 is compressed and the internal gas pressure increases, the gas can only be ejected outward from the sealing block 52 through the one-way output pipe 62, that is, ejected into the water flow inside the main pipe 1. Air jets into the water flow act as a buffer against the impact of the water flow, much like adding a "cushion" to water whose high-speed flow is suddenly obstructed, reducing the damage to pipes and seals caused by the enormous impact of water hammer. The deceleration throttling pipe 63 is connected to the inner wall of the bellows 61 and the sealed hollow pipe 51. When the sealing block 52 gradually returns to its initial position under the action of the storage spring 53, the bellows 61 expands, increasing its internal space and decreasing its pressure. At this time, external gas is slowly replenished into the bellows 61 through the deceleration throttling pipe 63. The deceleration throttling pipe 63 acts as a throttling device, making the gas replenishment rate relatively slow, ensuring a smooth gas replenishment process within the bellows 61, avoiding rapid internal pressure changes caused by the rapid return of the sealing block 52, and preparing for the next water hammer impact when air is jetted.

[0036] It should be noted that, in this document, relational terms such as "first" and "second" are used only to distinguish one entity or operation from another, and do not necessarily require or imply any such actual relationship or order between these entities or operations. Furthermore, the terms "comprising," "including," or any other variations thereof are intended to cover non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements includes not only those elements but also other elements not expressly listed, or elements inherent to such process, method, article, or apparatus.

[0037] 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 check sealing element comprising a main pipe (1), an inlet end (2) and an outlet end (3), characterized in that: The main pipe (1) is provided with a check mechanism (4), the check mechanism (4) comprises: The protective cover (41) is fixedly connected to the main pipe (1), the main pipe (1) is provided with a return spring (42), one end of the return spring (42) is fixedly connected to the main pipe (1), the other end of the return spring (42) is fixedly connected with a connecting disc (43), the connecting disc (43) is fixedly connected with a connecting rod (44), one end of the connecting rod (44) away from the connecting disc (43) is fixedly connected with a check disc (45), the connecting rod (44) is connected with the main pipe (1) piston; The main pipe (1) is provided with a buffer mechanism (5), the buffer mechanism (5) comprises: The sealing hollow pipe (51) is fixedly connected to the main pipe (1), the inner wall of the sealing hollow pipe (51) is connected with a sealing block (52), the sealing block (52) and the inner wall of the sealing hollow pipe (51) are provided with a force storage spring (53), one end of the force storage spring (53) is fixedly connected to the inner wall of the sealing hollow pipe (51), the other end of the force storage spring (53) is fixedly connected to the sealing block (52); The sealing block (52) is provided with a jet mechanism (6), the jet mechanism (6) is used for jetting water flow when the sealing block (52) impacts.

2. A seal according to claim 1, wherein: The two ends of the main pipe (1) are connected with the inlet end (2) and the output end (3) respectively, the outer wall of the connecting disc (43) is connected with the inner wall of the protective cover (41).

3. A seal according to claim 1, wherein: The jet mechanism (6) comprises a bellows (61), one end of the bellows (61) is fixedly connected to the inner wall of the sealing hollow pipe (51), the other end of the bellows (61) is fixedly connected to the sealing block (52), the inner wall of the sealing block (52) is fixedly connected with a one-way output pipe (62), the inner wall of the sealing hollow pipe (51) is fixedly connected with a slow-speed throttling pipe (63).

4. A seal according to claim 3, wherein: The one-way output pipe (62) comprises a one-way pipe body (621), the inner wall of the one-way pipe body (621) is provided with a fixed disc block (622), the fixed disc block (622) is provided with a connecting spring (623), one end of the connecting spring (623) is fixedly connected to the fixed disc block (622), the other end of the connecting spring (623) is fixedly connected with a sealing disc (624), the inner wall of the one-way pipe body (621) is fixedly connected with a sealing ring (625).

5. A seal according to claim 4, wherein: The slow-speed throttling pipe (63) comprises a throttling pipe body (631), the inner wall of the throttling pipe body (631) is provided with a micro hole (632).

6. A seal according to claim 3, wherein: The protective cover (41) is provided with an observation window, the edge of the check disc (45) is chamfered.

7. A seal according to claim 4, wherein: The check disc (45) is provided with a sealing gasket, the one-way conduction performance of the one-way output pipe (62) can be adjusted by adjusting the elastic coefficient of the connecting spring (623).

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