Anti-water hammer explosion-proof pipe pilot valve

Abstract

The utility model belongs to water pipe valve body technical field, concretely relates to anti -water hammer explosion -proof pipe pilot valve, including the water pipe body of two end openings, be provided with the water inlet, the pipe body inner chamber and the water outlet intercommunication formed main waterway in the water pipe body, the inside of water inlet is provided with the piston of area greater than water inlet, be provided with switch spring between the inside of water outlet and piston, the centre of piston is connected with the front end of switch connecting rod, the middle part of switch connecting rod is provided with the inner recessed flow guide groove around, the flow guide groove is connected with the guide ring, the inside diameter of guide ring is equal with switch connecting rod, the rear end of switch connecting rod is provided with the one -way leather cup towards water outlet, the gap between piston and switch connecting rod, flow guide groove and water outlet intercommunication form secondary waterway, the utility model can prevent the impact influence of water hammer efficiency to switch valve, water pipe, gondola waterway equipment such as shower, and cut off waterway in time when water pipe burst leaks, prevent resource waste leakage, effectively improve the pipeline reliability.

Description

Technical Field

[0001] This utility model relates to the field of water pipe valve technology, and more specifically, to a pilot valve for water hammer prevention and explosion protection. Background Technology

[0002] In modern life, bathroom fixtures have become indispensable products, including bathroom cabinets, faucets and showerheads, toilets, bathroom equipment, washbasins, flush valves, bathroom accessories, bathtubs, shower rooms, saunas, bathroom appliances, bathroom mirrors, and other products. With the progress of scientific development, people have increasingly higher requirements for the quality and functionality of bathroom fixtures.

[0003] When using bathroom fixtures such as showerheads and faucets, it is often necessary to control the water flow. When the water flow speed in the pipes suddenly changes (such as by quickly closing a valve), the fluid's kinetic energy is instantly converted into pressure energy, thereby generating a violent pressure wave in the pipes. This pressure wave propagates and reflects back and forth in the pipe system, much like striking the pipes with a hammer. This adverse phenomenon is known as the "water hammer effect" or water hammer.

[0004] The instantaneous pressure generated by water hammer can far exceed the normal design operating pressure of a pipeline system, typically reaching 1.5 to 4 times or even higher than the normal pressure, thus posing a significant hazard. Its main harmful effects include: Damage to the piping system: Pipe burst or rupture: Excessive pressure directly exceeds the ultimate strength of the pipe material, causing the pipe to burst, which is the most serious consequence.

[0005] Damage to pipe connections can lead to broken flange bolts, loose joints, and cracked welds, resulting in serious leaks.

[0006] Pipeline deformation and support damage: The huge impact force can cause the pipeline to vibrate, shift, or even damage the pipeline support or hanger.

[0007] Damage to equipment and instruments: Pump damage: If the pump suddenly stops or the power is cut off at the pump outlet, the water flow will reverse and impact the pump impeller, potentially causing the pump shaft to break, bearings to be damaged, or the impeller to shatter. This type of water hammer caused by pump shutdown is called "shutdown water hammer," and it is the most common and dangerous type in engineering.

[0008] Valve damage: Impact force may damage the valve plate, valve core, or actuator.

[0009] Instrument malfunction: Precision instruments such as pressure gauges and flow meters may become inaccurate or damaged under severe pressure fluctuations.

[0010] This could lead to secondary accidents and safety risks. Pipeline rupture can lead to a large-scale leak of media (such as water, chemicals, oil, etc.), resulting in resource waste and environmental pollution.

[0011] In residential buildings, burst water pipes can flood rooms, damaging renovations and property.

[0012] In critical facilities such as power plants and chemical plants, it may cause shutdowns, production stoppages, or even catastrophic accidents such as fires and explosions.

[0013] System operation issues: Continuous pipe vibration and noise affect equipment lifespan and living comfort.

[0014] This could lead to system cavitation, further corroding and damaging the inner wall of the pipe.

[0015] Therefore, in order to avoid the various negative effects of water hammer on shower equipment and to improve the service life and reliability of the products, it is necessary to develop a water delivery mechanism with protective functions such as isolating water hammer. Utility Model Content

[0016] To address the issue of water hammer effects on bathroom water equipment such as showerheads and faucets, which can easily lead to pipe damage or even pipe bursts and leaks when in use, we provide water hammer-resistant and explosion-proof pilot valves.

[0017] The anti-water hammer explosion-proof pilot valve includes a water-passing pipe body with openings at both ends. The water-passing pipe body is provided with an inlet, a main water passage formed by the connection of the inner cavity of the pipe body and an outlet. A piston with an area larger than the inlet is provided on the inner side of the inlet. A switch spring is provided between the inner side of the outlet and the piston. The center of the piston is connected to the front end of a switch rod. A concave guide groove is provided around the middle of the switch rod. A guide ring is connected in series on the guide groove. The inner diameter of the guide ring is equal to that of the switch rod. A one-way cup facing the outlet is provided at the rear end of the switch rod. The gap between the piston and the switch rod, the guide groove and the outlet are connected to form a secondary water passage.

[0018] Furthermore, the water pipe body includes a water supply bracket installed on the inner side, an inlet, a pipe inner cavity and an outlet are set on the water supply bracket, a guide ring is fixedly sleeved in the water supply bracket, and a switch spring is set between the guide ring and the piston.

[0019] Furthermore, a retaining ring is installed on the inner side of the switch linkage corresponding to the piston, and the diameter of the retaining ring is larger than that of the switch linkage.

[0020] Furthermore, the one-way cup is funnel-shaped with its diameter gradually increasing towards the outlet.

[0021] Furthermore, a sealing ring is provided on the inner ring of the guide ring.

[0022] Furthermore, the rear end of the one-way cup is provided with a detachable connector, the inner side of the detachable connector is provided with a support rod corresponding to the switch linkage, and the outer side of the detachable connector is provided with an arc-shaped protrusion, which is fastened to the arc-shaped groove on the inner side of the water outlet.

[0023] Furthermore, a water outlet interface is detachably installed on the water pipe body corresponding to the rear end of the detachable connector, and the inner width of the water outlet interface is smaller than the width of the detachable connector.

[0024] Furthermore, the outer surface of the water pipe is provided with a flow direction indicator from the inlet to the outlet.

[0025] The advantages of this utility model are: 1. By utilizing designs such as pistons with spring switches, one-way cups, and positive and negative water circuits, the damage caused by water hammer to downstream valves, shower heads, water pipes, and other equipment is effectively reduced.

[0026] 2. When a water pipe bursts, the switch linkage moves backward to close the auxiliary water circuit, and at the same time the piston seals the inlet to close the main water circuit, thus preventing water leakage from the burst pipe.

[0027] 3. Compact structure and easy assembly. Attached Figure Description

[0028] 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.

[0029] Figure 1 This is a schematic diagram of the structure of the pilot valve for the water hammer blast-proof pipe; Figure 2 This is an exploded structural diagram of the pilot valve for the water hammer blast-proof pipe. Figure 3 This is a cross-sectional view of the valve body in operation when the water circuit is closed. Figure 4 A cross-sectional view of the valve body in operation when the water circuit is normally open and water is flowing out. Figure 5 A cross-sectional view of the valve body in operation at the instant the water circuit is closed; Figure 6 A cross-sectional view of the valve body in operation at the moment the water pipe bursts; Figure 7 Diagram showing the docking and usage status of the pilot valve for the water hammer prevention and explosion-proof pipe.

[0030] Attached image labels: 1. Water pipe body; 101. Inlet; 102. Inner cavity of the pipe body; 103. Outlet; 104. Water supply bracket; 2. Piston; 3. Switch spring; 4. Switch linkage; 401. Flow guide groove; 5. Guide ring; 6. One-way cup; 7. Snap ring; 8. Sealing ring; 9. Drop joint; 901. Support rod; 902. Arc-shaped protrusion; 903. Arc-shaped groove; 10. Outlet connection; 11. Flow direction indicator. Detailed Implementation

[0031] To address the issue of water hammer effects on bathroom water equipment such as showerheads and faucets, which can easily lead to pipe damage or even pipe bursts and leaks when in use, we provide water hammer-resistant and explosion-proof pilot valves.

[0032] To make the objectives, technical solutions, and advantages of the embodiments of this utility model clearer, the technical solutions of the embodiments of this utility model will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some, not all, of the embodiments of this utility model. Based on the embodiments of this utility model, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of this utility model.

[0033] It should be noted that the terms such as "inner", "middle" and "one" used in this specification are only for clarity of description and are not intended to limit the scope of implementation of this utility model. Any changes or adjustments to their relative relationships, without substantially altering the technical content, should also be considered as part of the scope of implementation of this utility model, as stated above.

[0034] In the description of this utility model, it should be understood that the terms "upper," "lower," "front," "rear," "left," "right," "vertical," and "horizontal," etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are used only for the convenience of describing this utility model and for 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. Furthermore, the terms "first," "second," etc., are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of indicated technical features. Thus, features defined with "first," "second," etc., may explicitly or implicitly include one or more of that feature. In the description of this utility model, it should be noted that unless otherwise explicitly specified and limited, the terms "installed," "connected," and "joined" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a direct connection or an indirect connection through an intermediate medium; they can refer to the internal connection of two components. For those skilled in the art, the specific meaning of the above terms in this utility model can be understood through specific circumstances.

[0035] like Figure 1 , 2 As shown in Figure 7, this embodiment provides a pilot valve for a water hammer-resistant and explosion-proof pipe, including a water pipe body 1 with openings at both ends. The water pipe body 1 is provided with a main water passage formed by an inlet 101, a pipe body cavity 102, and an outlet 103. A piston 2 with an area larger than the inlet 101 is provided on the inner side of the inlet 101. A switch spring 3 is provided between the inner side of the outlet 103 and the piston 2. The front end of a switch rod 4 is connected in series to the center of the piston 2. A concave guide groove 401 is provided around the middle of the switch rod 4. A guide ring 5 is connected in series on the guide groove 401. The inner diameter of the guide ring 5 is equal to that of the switch rod 4. A one-way cup 6 facing the outlet 103 is provided at the rear end of the switch rod 4. The gap between the piston 2 and the switch rod 4, the guide groove 401, and the outlet 103 are connected to form a secondary water passage.

[0036] The water pipe body 1 includes a water-passing bracket 104 installed on the inner side. An inlet 101, an inner cavity 102, and an outlet 103 are disposed on the water-passing bracket 104. A guide ring 5 is fixedly sleeved within the water-passing bracket 104, and a switch spring 3 is disposed between the guide ring 5 and the piston 2. The water-passing bracket 104 provides support for the internal piston 2 and other components, while the water pipe body 1 serves as an outer shell for protection. The structure is highly stable and easy to assemble.

[0037] A retaining ring 7 is installed on the inner side of the switch linkage 4 corresponding to the piston 2. The diameter of the retaining ring 7 is larger than that of the switch linkage 4. The retaining ring 7 can ensure that the switch linkage 4 can move between the piston 2 and the guide ring 5, preventing it from coming off and failing.

[0038] The one-way cup 6 is funnel-shaped with its diameter gradually increasing towards the outlet. The funnel-shaped cup 6 can effectively absorb and buffer the reverse impact of water hammer when the water channel is closed.

[0039] A sealing ring 8 is provided on the inner ring of the guide ring 5. The sealing ring 8 can improve the waterproof sealing performance and ensure that the water passage is sealed in time in the event of a water pipe burst.

[0040] The rear end of the one-way cup 6 is provided with a detachable connector 9. A support rod 901 is provided on the inner side of the detachable connector 9 corresponding to the switch linkage 4. An arc-shaped protrusion 902 is provided on the outer side of the detachable connector 9, which engages with the arc-shaped groove 903 on the inner side of the outlet 103. The detachable connector 9 can limit the movement of the switch linkage 4 when the piston 2 drives it to move normally, ensuring the flow channel 401 remains connected. In the event of a water pipe burst, the connector 9 detaches, allowing the switch linkage 4 to move backward and then fit into the sealing ring 8, thereby sealing the secondary water passage.

[0041] A water outlet interface 10 is detachably installed on the water pipe body 1 corresponding to the rear end of the detachable connector 9. The inner width of the water outlet interface 10 is smaller than the width of the detachable connector 9. In this embodiment, the water outlet interface 10 is threadedly connected to the water pipe body 1, which facilitates the installation and removal of internal components such as the piston 2, and avoids damage to components by utilizing the narrow opening.

[0042] The outer surface of the water pipe body 1 is provided with a flow direction indicator 11 pointing from the inlet 101 to the outlet 103. The flow direction indicator 11 makes it convenient for users to quickly confirm the connection direction of the pipe body when connecting the pipeline, and prevents reverse connection.

[0043] This embodiment has four working states during use: 1. For example Figure 3 As shown, when the water circuit is closed, the water flow is relatively still. The static pressure P2 on the side of piston 2 facing the inlet 101 is equal to the static pressure P1 on the inside of piston 2. Since the water passage area S1 of the main water circuit is larger than the water passage area S2 of the secondary water circuit, the force on the piston is F = S1 × P1 + spring force - S2 × P2, meaning the force F is directed towards the inlet 101. Piston 2 presses forward to block the inlet 101, closing the main water circuit. Regardless of the water hammer impact, the force acts solely on piston 2. The secondary water circuit becomes a slender damping orifice, effectively reducing the instantaneous impact of water hammer pressure on piston 2 and the downstream hose, thus improving the service life of the outlet hose.

[0044] 2. For example Figure 4As shown, when the water circuit is continuously open, the internal pressure of the auxiliary water circuit is P3, the inlet pressure is P4, and the dynamic pressure of the water exiting outlet 103 is P5. The internal pressure of the auxiliary water circuit, P3, is reduced by the narrow damping orifice between the switch rod 4 and the piston 2. P3 is less than P4, creating a pressure difference. The force on the piston is F = S1 × P3 + spring force - S2 × P4. When the pressure difference between P4 and P3 reaches a certain value, although S1 is greater than S2, the force F is negative, and the water force pushes the piston 2 inward to open the main water circuit. At the same time, because P4 is greater than P5, the water flow will continuously push the one-way cup 6 backward, thereby driving the switch rod 4 to move and press against the front end of the support rod 901, continuously opening the auxiliary water circuit. The pilot valve principle controls the continuous water output from the main water circuit.

[0045] 3. For example Figure 5 As shown, the force on the piston is F = S1 × P1 + spring force - S2 × P2. Since P1 equals P2 and S1 is greater than S2, the force F is directed towards the inlet 101, thus closing the main water passage. At the same time, the water hammer impact at the moment of closing pushes the one-way cup 6 inward, thereby causing the switch rod 4 to move to the origin position, causing the guide channel 401 to tend to close. The gap between the switch rod 4 and the piston 2 forms a slender damping orifice to reduce the impact of water hammer pressure.

[0046] 4. For example Figure 6 As shown, when the water pipe suddenly bursts, the dynamic pressure P6 in the inner cavity 102 of the pipe is equal to the dynamic pressure P7 in front of the inlet. The force on the piston is F = S1 × P6 + spring force - S2 × P7. Since P6 equals P7 and S1 is greater than S2, the piston 2 blocks the inlet 101 forward, closing the main water circuit. The powerful outflow impact will push the one-way cup 6 backward, thereby driving the switch linkage 4 to move backward and tighten in the sealing ring 8, closing the secondary water circuit. Meanwhile, the detachable connector 9 is pushed out of the outlet 103 by the powerful water flow and enters the inner side of the outlet interface 10, and the support rod 901 no longer presses against the end of the switch linkage 4.

[0047] The above description is a further detailed explanation of the present utility model in conjunction with specific preferred embodiments. It should not be assumed that the specific implementation of the present utility model is limited to these descriptions. All equivalent changes and modifications made within the scope of this application should still fall within the scope of the present utility model.

Claims

1. A pilot valve for water hammer prevention and explosion-proof pipes, characterized in that, The device includes a water pipe with openings at both ends. The water pipe has an inlet, a main water passage formed by the connection of the inner cavity of the pipe and the outlet. A piston with an area larger than the inlet is installed inside the inlet. A switch spring is installed between the inner side of the outlet and the piston. The center of the piston is connected to the front end of a switch rod. A concave guide groove is arranged around the middle of the switch rod. A guide ring is connected in series on the guide groove. The inner diameter of the guide ring is equal to that of the switch rod. A one-way cup facing the outlet is installed at the rear end of the switch rod. The gap between the piston and the switch rod, the guide groove and the outlet are connected to form a secondary water passage.

2. The anti-water hammer explosion-proof pilot valve according to claim 1, characterized in that, The water supply pipe includes a water supply bracket installed on the inner side, an inlet, a pipe inner cavity and an outlet are set on the water supply bracket, a guide ring is fixedly sleeved in the water supply bracket, and a switch spring is set between the guide ring and the piston.

3. The anti-water hammer explosion-proof pilot valve according to claim 2, characterized in that, A retaining ring is installed on the inner side of the piston corresponding to the switch linkage, and the diameter of the retaining ring is larger than that of the switch linkage.

4. The anti-water hammer explosion-proof pilot valve according to claim 1, characterized in that, The one-way cup is funnel-shaped with its diameter gradually increasing towards the outlet.

5. The anti-water hammer explosion-proof pilot valve according to claim 1, characterized in that, A sealing ring is provided on the inner ring of the guide ring.

6. The anti-water hammer explosion-proof pilot valve according to claim 1, characterized in that, The rear end of the one-way cup is provided with a detachable connector. The inner side of the detachable connector is provided with a support rod corresponding to the switch linkage. The outer side of the detachable connector is provided with an arc-shaped protrusion, which is engaged with the arc-shaped groove on the inner side of the water outlet.

7. The anti-water hammer explosion-proof pilot valve according to claim 6, characterized in that, The water pipe body is detachably equipped with a water outlet interface corresponding to the rear end of the detachable connector. The inner width of the water outlet interface is smaller than the width of the detachable connector.

8. The anti-water hammer explosion-proof pilot valve according to claim 1, characterized in that, The outer surface of the water pipe is marked with a flow direction indicator from the inlet to the outlet.

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