Self-adaptive low-pass high-stop one-way valve for fire-fighting pipeline

Abstract

The utility model discloses a self-adaptive low-pass high-check one-way valve for a fire-fighting pipeline. The self-adaptive low-pass high-check one-way valve comprises a first valve body and a second valve body, a first guide cavity, a spring limiting cavity and a discharge port are sequentially formed in the first valve body from front to back; an inlet, a sealing cavity, a second guide cavity and a circulation opening are sequentially formed in the second valve body from front to back; the rear end of the second valve body is connected with the front end of the first valve body so that the first guide cavity, the circulation opening and the second guide cavity can be communicated, a valve element is movably arranged in the first guide cavity, the circulation opening, the second guide cavity and the sealing cavity, the rear end of the valve element is connected with a spring, and the rear end of the spring is connected with a spring limiting cavity. A flow guide groove extending in the axial direction is formed in the inner side wall of the second guide cavity, and the rear end of the flow guide groove penetrates through the inner side wall of the second guide cavity and communicates with the circulation opening. Low-pressure conduction, high-pressure cut-off and reverse cut-off of fluid are achieved, reverse sealing of equipment at the inlet end is guaranteed, and meanwhile high-pressure fluid at the inlet is effectively prevented from flowing out of the outlet.

Description

Technical Field

[0001] This utility model relates to the field of one-way valve technology, and in particular to an adaptive low-flow, high-stop one-way valve for fire protection pipelines. Background Technology

[0002] The basic principle of a mechanical check valve is that, through the interaction of the valve core, valve body, and spring, when the fluid inlet pressure is higher than the fluid outlet pressure, the valve core squeezes the spring to create a gap, allowing the fluid to flow; when the fluid inlet pressure is lower than the outlet pressure, the valve core closes under the force of the spring, thereby achieving a check and seal effect.

[0003] Existing mechanical check valves operate in a conducting state when the pressure difference between the fluid inlet and outlet exceeds the valve body's opening force. However, in fire protection pipelines, the pressure difference is often very large. If the pressure difference increases to a level sufficient to damage the equipment at the valve outlet, the valve core may fail to lock, causing damage to the outlet equipment and resulting in incalculable losses. Some companies have considered using electrically controlled valves to achieve valve shut-off under high pressure conditions. However, this approach requires matching electrical wiring and sensors to monitor high-pressure flow, resulting in a complex system, high cost, and relatively short lifespan for electrical components.

[0004] Based on the above drawbacks, developing an adaptive low-flow, high-stop check valve for fire protection pipelines has significant practical value. Summary of the Invention

[0005] In order to overcome the shortcomings of the existing technology, the purpose of this utility model is to provide an adaptive low-flow and high-stop check valve for fire protection pipelines, which can realize low-pressure conduction, high-pressure cut-off, and reverse cut-off of fluid. While ensuring reverse sealing of the inlet equipment, it effectively prevents the high-pressure fluid from flowing out of the outlet, thus avoiding waste of high-pressure fluid and harm to the outlet equipment and personnel.

[0006] The objective of this utility model is achieved through the following technical solution:

[0007] According to embodiments of this disclosure, an adaptive low-flow, high-stop check valve for fire-fighting pipelines is provided, comprising a first valve body and a second valve body;

[0008] The first valve body has, from front to back, a first guide cavity, a spring limiting cavity, and a discharge port;

[0009] The second valve body has, from front to back, an inlet, a sealing cavity, a second guide cavity, and a flow port.

[0010] The rear end of the second valve body is connected to the front end of the first valve body so that the first guide cavity, the flow port, and the second guide cavity are connected. A valve core is movably arranged in the first guide cavity, the flow port, the second guide cavity, and the sealing cavity. A spring is connected to the rear end of the valve core, and the rear end of the spring is connected to the spring limiting cavity. A guide groove extending axially is opened on the inner side wall of the second guide cavity. The rear end of the guide groove passes through the inner side wall of the second guide cavity and is connected to the flow port.

[0011] In a preferred embodiment, the valve core is cylindrical, and the diameter of the valve core is larger than the diameter of the spring limiting cavity.

[0012] As a preferred embodiment, the rear end of the valve core is provided with a mounting groove, and the front end of the spring is connected to the mounting groove.

[0013] In a preferred embodiment, the diameter of the outlet is smaller than the diameter of the spring limiting cavity.

[0014] As a preferred embodiment, a first sealing ring is provided at the rear end of the first guide cavity, and the rear end of the valve core can abut against the first sealing ring.

[0015] In a preferred embodiment, the spring passes through the first sealing ring.

[0016] In a preferred embodiment, a second sealing ring is provided at the front end of the sealing cavity, and the front end of the valve core can abut against the second sealing ring.

[0017] As a preferred embodiment, the front outer side of the first valve body is provided with an external thread, and the rear inner side of the second valve body is provided with an internal thread. The first valve body and the second valve body are connected together by the cooperation of the external thread and the internal thread.

[0018] In a preferred embodiment, a first hexagonal block is sleeved on the outer side of the first valve body; a second hexagonal block is sleeved on the outer side of the second valve body, and the inner cavity of the second hexagonal block forms the flow port; the front end face of the first hexagonal block and the rear end face of the second hexagonal block abut against each other.

[0019] In summary, compared with the prior art, this utility model has the following beneficial effects:

[0020] 1. It can achieve low-pressure conduction, high-pressure cut-off, and reverse cut-off of fluid, ensuring reverse sealing of the inlet equipment while effectively preventing the high-pressure fluid from flowing out of the outlet, thus avoiding waste of high-pressure fluid and harm to the outlet equipment and personnel.

[0021] 2. A guide cavity is provided in the valve body, eliminating the need for a separate guide rod design, resulting in a simple structure and strong versatility;

[0022] 3. The first valve body and the second valve body are connected together by the fit of external and internal threads, which makes it highly versatile and easy to promote. Attached Figure Description

[0023] Figure 1 This is an exploded view of the one-way valve of this utility model;

[0024] Figure 2 This is a cross-sectional view of the one-way valve of this utility model in the open state;

[0025] Figure 3 This is a cross-sectional view of the one-way valve of this utility model in the reverse shut-off state;

[0026] Figure 4 This is a cross-sectional view of the one-way valve of this utility model in the high-pressure shut-off state;

[0027] Figure 5 This is a schematic diagram of the second valve body of this utility model;

[0028] The numbers and letters in the diagram represent the names of the corresponding components:

[0029] 1. First valve body; 11. First guide cavity; 12. Spring limiting cavity; 13. Outlet; 14. First sealing ring; 15. First hexagonal block;

[0030] 2. Second valve body; 21. Inlet; 22. Sealing cavity; 23. Second guide cavity; 24. Flow port; 25. Guide groove; 26. Second sealing ring; 27. Second hexagonal block;

[0031] 3. Valve core; 31. Mounting groove;

[0032] 4. Spring. Detailed Implementation

[0033] 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.

[0034] Example 1: As Figures 1 to 5As shown, an adaptive low-flow, high-stop check valve for fire protection pipelines includes a first valve body 1 and a second valve body 2. The first valve body 1 has, from front to back, a first guide cavity 11, a spring-limiting cavity 12, and a discharge port 13. The second valve body 2 has, from front to back, an inlet 21, a sealing cavity 22, a second guide cavity 23, and a flow port 24. The rear end of the second valve body 2 is connected to the front end of the first valve body 1, so that the first guide cavity 11, the flow port 24, and the second guide cavity 23 are connected. A valve core 3 is movably disposed within the first guide cavity 11, the flow port 24, the second guide cavity 23, and the sealing cavity 22. A spring 4 is connected to the rear end of the valve core 3, and the rear end of the spring 4 is connected to the spring-limiting cavity 12. An axially extending guide groove 25 is formed on the inner wall of the second guide cavity 23, and the rear end of the guide groove 25 penetrates the inner wall of the second guide cavity 23 and communicates with the flow port 24.

[0035] During implementation, the valve core 3 slides within the first guide cavity 11, the flow port 24, the second guide cavity 23, and the sealing cavity 22 when subjected to pressure differential.

[0036] In practice, both the first valve body 1 and the second valve body 2 are hollow cylindrical.

[0037] During implementation, the starting pressure under low pressure and the cut-off pressure under high pressure can be adjusted by adjusting the elastic coefficient of spring 3.

[0038] In practice, by adjusting the depth of the spring limiting cavity 12 and the length of the spring 3, the high pressure cut-off pressure can be adjusted without adjusting the starting pressure in the low pressure conduction state by matching the upper valve body with spring limiting grooves of different specifications.

[0039] In practice, four flow channels 25 are evenly arranged circumferentially along the second guide cavity 23. After the valve core 3 is pushed upward by the fluid, the fluid can flow through the flow channels 25 to the outlet 13 via the flow port 24.

[0040] Specifically, the valve core 3 is cylindrical, and the diameter of the valve core 3 is larger than the diameter of the spring limiting cavity 12.

[0041] Specifically, the rear end of the valve core 3 is provided with a mounting groove 31, and the front end of the spring 4 is connected to the mounting groove 31.

[0042] Specifically, the diameter of the outlet 13 is smaller than the diameter of the spring limiting cavity 12.

[0043] Specifically, a first sealing ring 14 is provided at the rear end of the first guide cavity 11, and the rear end of the valve core 3 can abut against the first sealing ring 14.

[0044] Specifically, the spring 4 passes through the first sealing ring 14.

[0045] In this embodiment, the high-pressure cut-off spring 4 is squeezed into the spring limiting cavity 12, thereby pressing the valve core 3 against the first sealing ring 14 to achieve sealing in the high-pressure cut-off state.

[0046] Specifically, a second sealing ring 26 is provided at the front end of the sealing cavity 22, and the front end of the valve core 3 can abut against the second sealing ring 26.

[0047] In practice, the depth of the guide groove 25 is less than that of the second guide cavity 23, and a sealing cavity 22 is connected to the front of the second guide cavity 23. The depth of the sealing cavity 22 is greater than that of the second sealing ring 26. In this way, a sealing surface can be formed when the valve core 3 is pressed by the spring 4. The second sealing ring 26 at the bottom can effectively ensure the sealing performance of the one-way valve in the reverse shut-off state.

[0048] Specifically, the front outer side of the first valve body 1 is provided with an external thread, and the rear inner side of the second valve body 2 is provided with an internal thread. The first valve body 1 and the second valve body 2 are connected together by the cooperation of the external thread and the internal thread.

[0049] In this embodiment, the connection between the first guide cavity of the first valve body and the second guide cavity of the second valve body is achieved through a threaded connection, which not only ensures the feasibility of machining the guide groove 25, but also ensures the tight fit between the valve core 3 and the first sealing ring 14 under high pressure cut-off conditions.

[0050] Specifically, a first hexagonal block 15 is sleeved on the outer side of the first valve body 1; a second hexagonal block 27 is sleeved on the outer side of the second valve body 2, the inner cavity of the second hexagonal block 27 forms the flow port 24, and the front end of the first valve body 1 is inserted into the flow port 24; the front end face of the first hexagonal block 15 and the rear end face of the second hexagonal block 27 abut against each other.

[0051] In this embodiment, a tight connection between the first valve body 1 and the second valve body 2 can be achieved by using bolts to pass through the first hexagonal block 15 and the second hexagonal block 27.

[0052] During implementation, the check valve has three states, which are implemented as follows:

[0053] a) Reverse shut-off state: When there is no pressure difference between the inlet and outlet or the pressure difference is less than the starting pressure, the valve core 3 presses the second sealing ring 26 under the reaction force of the spring 4 to achieve reverse shut-off sealing.

[0054] b) Conductive state: When the pressure difference between the inlet and outlet is greater than the starting pressure and less than the shut-off pressure, the valve core 3 squeezes the spring 4 to create a gap, and the fluid is discharged through the guide groove 26 and the outlet 13, thus realizing the conductive state;

[0055] c) High-pressure shut-off state: The pressure difference between the inlet and outlet further increases, the valve core 3 compresses the spring 4 and presses the first sealing ring 14 to achieve positive shut-off for high-pressure fluid.

[0056] In this embodiment, to ensure manufacturability, the components of the one-way valve should be easy to process and obtain. Except for the first valve body and the second valve body, the valve core, spring, first sealing ring, and second sealing ring should all be general-purpose parts. The assembly between the various parts of the valve should be convenient and can be achieved using general-purpose tools.

[0057] The above embodiments only illustrate several implementation methods of this utility model, and their descriptions are relatively specific and detailed, but they should not be construed as limiting the scope of the utility model patent. It should be noted that for those skilled in the art, several modifications and improvements can be made without departing from the concept of this utility model. These are all equivalent modifications and improvements made to the above embodiments based on the essential technology of this utility model, and all of these fall within the protection scope of this utility model.

Claims

1. An adaptive low-flow, high-stop check valve for fire-fighting pipelines, characterized in that, Includes a first valve body and a second valve body; The first valve body has, from front to back, a first guide cavity, a spring limiting cavity, and a discharge port; The second valve body has, from front to back, an inlet, a sealing cavity, a second guide cavity, and a flow port. The rear end of the second valve body is connected to the front end of the first valve body so that the first guide cavity, the flow port, and the second guide cavity are connected. A valve core is movably arranged in the first guide cavity, the flow port, the second guide cavity, and the sealing cavity. A spring is connected to the rear end of the valve core, and the rear end of the spring is connected to the spring limiting cavity. A guide groove extending axially is opened on the inner side wall of the second guide cavity. The rear end of the guide groove passes through the inner side wall of the second guide cavity and is connected to the flow port.

2. The adaptive low-flow, high-stop check valve for fire-fighting pipelines according to claim 1, characterized in that, The valve core is cylindrical, and its diameter is larger than the diameter of the spring limiting cavity.

3. The adaptive low-flow, high-stop check valve for fire-fighting pipelines according to claim 2, characterized in that, The valve core has a mounting groove at its rear end, and the front end of the spring is connected to the mounting groove.

4. The adaptive low-flow, high-stop check valve for fire-fighting pipelines according to claim 2, characterized in that, The diameter of the outlet is smaller than the diameter of the spring limiting cavity.

5. The adaptive low-flow, high-stop check valve for fire-fighting pipelines according to claim 1, characterized in that, A first sealing ring is provided at the rear end of the first guide cavity, and the rear end of the valve core can abut against the first sealing ring.

6. The adaptive low-flow, high-stop check valve for fire-fighting pipelines according to claim 5, characterized in that, The spring passes through the first sealing ring.

7. The adaptive low-flow, high-stop check valve for fire-fighting pipelines according to claim 1, characterized in that, A second sealing ring is provided at the front end of the sealing cavity, and the front end of the valve core can abut against the second sealing ring.

8. The adaptive low-flow, high-stop check valve for fire-fighting pipelines according to claim 1, characterized in that, The first valve body has an external thread on the outer front end, and the second valve body has an internal thread on the inner rear end. The first valve body and the second valve body are connected together by the engagement of the external thread and the internal thread.

9. The adaptive low-flow, high-stop check valve for fire-fighting pipelines according to claim 1, characterized in that, The first valve body is fitted with a first hexagonal block on its outer side; the second valve body is fitted with a second hexagonal block on its outer side, and the inner cavity of the second hexagonal block forms the flow port; the front end face of the first hexagonal block and the rear end face of the second hexagonal block abut against each other.

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