A flow control valve for water conservancy pipeline

Abstract

The present invention provides a water conservancy pipeline flow control valve, comprising: a valve core and a valve seat, the valve core comprising a first valve core, and a plurality of sealing contact surfaces are arranged on the first valve core. An elastic sealing ring is fixedly arranged on the valve seat, and when the valve is in a closed state, the elastic sealing ring is in contact with the plurality of sealing contact surfaces. The valve core comprises a second valve core, and the second valve core is coaxially arranged inside the first valve core, and the first valve core and the second valve core form a moving channel, and the moving channel enables the elastic sealing ring to accurately contact the plurality of sealing contact surfaces when the valve is in a closed state. By bringing the plurality of sealing contact surfaces arranged on the valve core into contact with the elastic sealing ring, the resistance that the fluid needs to overcome to leak through the sealing interface is increased, thereby enhancing the sealing effect, and effectively avoiding the problem that leakage points are prone to occur in traditional water conservancy pipeline flow control valves due to a single sealing surface and insufficient contact area.

Description

Technical Field

[0001] The invention relates to the field of fluid control, and in particular to a water conservancy pipeline flow control valve. Background Art

[0002] The hydraulic pipeline flow control valve is an important control component in the fluid delivery system and is widely used in many fields such as industry, agriculture, and domestic water. On the one hand, the hydraulic pipeline flow control valve can accurately control the water volume. The hydraulic pipeline flow control valve can flexibly adjust the water flow by changing the opening according to actual needs. On the other hand, the hydraulic pipeline flow control valve can cut off the water flow, so that the water flow can be completely closed in maintenance or emergency situations to prevent water leakage and the expansion of accidents.

[0003] At present, common water conservancy pipeline flow control valves mainly achieve water volume regulation and sealing based on the coordination between mechanical structure and seals. However, the sealing surface structure of traditional water conservancy pipeline flow control valves is single, mostly simple plane or annular seals. When foreign matter such as impurities and particles are mixed in the water, the foreign matter can easily get stuck between the sealing surfaces, destroying the tightness of the seal, and then causing leakage problems, which not only causes waste of water resources, but may also affect the normal operation of the entire system. Secondly, during the long-term and frequent opening and closing process, the single sealing surface is prone to lose its good sealing performance due to wear, reducing the service life of the water conservancy pipeline flow control valve and increasing maintenance costs.

[0004] The information disclosed in the background technology section of the present invention is only intended to deepen the understanding of the general background technology of the present invention, and should not be regarded as acknowledging or suggesting in any form that the information constitutes the prior art already known to those skilled in the art. Summary of the invention

[0005] Based on this, it is necessary to provide a water conservancy pipeline flow control valve to address the problem that the current traditional water conservancy pipeline flow control valve has a single sealing surface, and foreign matter mixed in the water flow is easily stuck between the sealing surfaces, thereby causing the water conservancy pipeline flow control valve to leak.

[0006] The above purpose is achieved through the following technical solutions:

[0007] A water conservancy pipeline flow control valve, comprising:

[0008] The valve core comprises a first valve core, and a plurality of sealing contact surfaces are arranged on the first valve core.

[0009] A valve seat is fixedly provided with an elastic sealing ring, and when the valve is in a valve closing state, the elastic sealing ring is in contact with the plurality of sealing contact surfaces.

[0010] The valve core includes a second valve core, and the second valve core is coaxially arranged inside the first valve core. The first valve core and the second valve core form a moving channel, and the moving channel enables the elastic sealing ring to accurately contact the multiple sealing contact surfaces when the valve is closed.

[0011] In one of the embodiments, in the valve closing stage, the first valve core, the second valve core and the elastic sealing ring form a buffer chamber, and the buffer chamber is used to reduce the impact force on the first valve core, the second valve core and the elastic sealing ring.

[0012] In one of the embodiments, the valve seat is provided with a fluid channel, and the fluid channel is used to allow fluid to enter and fill the elastic sealing ring.

[0013] In one embodiment, the fluid channel includes a water inlet and a water outlet, the fluid channel is provided with a first one-way valve at one end of the water inlet, and the fluid channel is provided with a second one-way valve at one end of the water outlet, and the first one-way valve and the second one-way valve limit the fluid to fill the elastic sealing ring only when the valve is closed.

[0014] In one of the embodiments, in the valve closing state, the first valve core restricts the fluid from flowing out of the elastic sealing ring.

[0015] In one embodiment, the second valve core is movably connected to the first valve core, and the second valve core is provided with an extrusion surface. Water pressure can drive the second valve core to move forward, and the positive movement of the second valve core drives the extrusion surface to extrude the elastic sealing ring. The distance of the positive movement of the second valve core is positively correlated with the degree of extrusion of the elastic sealing ring.

[0016] In one embodiment, an elastic member is disposed between the first valve core and the second valve core, and the elastic force of the elastic member always causes the first valve core and the second valve core to move away from each other or have a tendency to move away from each other.

[0017] In one embodiment, the first valve core is provided with a first protrusion, and the second valve core is provided with a second protrusion, and the first protrusion and the second protrusion are used to scrape off substances on the outer peripheral wall surface of the elastic sealing ring.

[0018] The beneficial effects of the present invention are:

[0019] The present invention provides a water conservancy pipeline flow control valve, comprising: a valve core and a valve seat, the valve core comprising a first valve core, and a plurality of sealing contact surfaces are arranged on the first valve core. An elastic sealing ring is fixedly arranged on the valve seat, and when the valve is in a closed state, the elastic sealing ring is in contact with the plurality of sealing contact surfaces. The valve core comprises a second valve core, and the second valve core is coaxially arranged inside the first valve core, and the first valve core and the second valve core form a moving channel, and the moving channel enables the elastic sealing ring to accurately contact the plurality of sealing contact surfaces when the valve is in a closed state. By bringing the plurality of sealing contact surfaces arranged on the valve core into contact with the elastic sealing ring, the resistance that the fluid needs to overcome to leak through the sealing interface is increased, thereby enhancing the sealing effect, and effectively avoiding the problem that leakage points are prone to occur in traditional water conservancy pipeline flow control valves due to a single sealing surface and insufficient contact area. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] Figure 1 A schematic diagram of the structure of a water conservancy pipeline flow control valve provided by an embodiment of the present invention;

[0021] Figure 2 A side view of a water conservancy pipeline flow control valve provided by an embodiment of the present invention;

[0022] Figure 3 for Figure 2 The AA section view of the water conservancy pipeline flow control valve;

[0023] Figure 4 for Figure 2 The AA section view of the water conservancy pipeline flow control valve when it is in the closed state;

[0024] Figure 5 for Figure 2 The AA section view after the second valve core moves when the water conservancy pipeline flow control valve is in the closed state;

[0025] Figure 6 for Figure 3 The structural diagram of the flow control valve B of the water conservancy pipeline;

[0026] Figure 7 for Figure 4 The structural diagram of the flow control valve C of the water conservancy pipeline;

[0027] Figure 8 for Figure 5 The structural diagram of the water pipeline flow control valve D.

[0028] in:

[0029] 100. Valve body;

[0030] 200, valve core; 210, first valve core; 211, first cylinder; 212, first protrusion; 220, second valve core; 221, second cylinder; 222, elastic member; 223, second protrusion;

[0031] 300, valve seat; 310, elastic sealing ring; 320, fluid channel; 321, water inlet; 322, water outlet. DETAILED DESCRIPTION

[0032] In order to make the purpose, technical solution and advantages of the present invention more clearly understood, the present invention is further described in detail below through embodiments and in conjunction with the accompanying drawings. It should be understood that the specific embodiments described herein are only used to explain the present invention and are not used to limit the present invention.

[0033] The serial numbers assigned to the components herein, such as "first", "second", etc., are only used to distinguish the objects described and do not have any order or technical meaning. The "connection" and "coupling" mentioned in the present invention, unless otherwise specified, include direct and indirect connections (couplings). In the description of the present invention, it should be understood that the terms "upper", "lower", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside", "clockwise", "counterclockwise", etc., indicating the orientation or position relationship are based on the orientation or position relationship shown in the accompanying drawings, which is only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as a limitation to the present invention.

[0034] In the present invention, unless otherwise clearly specified and limited, a first feature being "above" or "below" a second feature may mean that the first and second features are in direct contact, or the first and second features are in indirect contact through an intermediate medium. Moreover, a first feature being "above", "above" or "above" a second feature may mean that the first feature is directly above or obliquely above the second feature, or simply means that the first feature is higher in level than the second feature. A first feature being "below", "below" or "below" a second feature may mean that the first feature is directly below or obliquely below the second feature, or simply means that the first feature is lower in level than the second feature.

[0035] Refer to the following Figure 1-Figure 8 A water conservancy pipeline flow control valve provided in an embodiment of the present invention is described.

[0036] like Figure 1-Figure 2As shown, the hydraulic pipeline flow control valve provided in the embodiment of the present invention is particularly suitable for fluid opening control and fluid closing control in various water-related systems such as industrial cooling systems and building water supply systems. Of course, the hydraulic pipeline flow control valve can also be used in other operating scenarios that require control of the flow state of liquid media. The above categories contain subcategories, and as long as they meet the above technical effects, they can all be applied to this application. In order to explain the embodiments of the present invention more clearly, detailedly and comprehensively, a normally open solenoid valve is selected as an example for explanation.

[0037] Specifically, the normally open solenoid valve includes a valve body 100, a valve core 200 and a valve seat 300. The valve body 100 serves as the basic frame of the normally open solenoid valve, and the valve body 100 provides installation space and support for the valve core 200 and the valve seat 300. A flow channel is arranged inside the valve body 100, and the flow channel determines the direction of the fluid. The valve core 200 is located inside the valve body 100 and can move inside the valve body 100. The valve core 200 determines the opening and closing of the normally open solenoid valve according to the control signal. The valve seat 300 is fixed on the valve body 100, and the valve seat 300 provides accurate support and positioning for the valve core 200 to ensure the precise movement of the valve core 200. The valve seat 300 and the valve core 200 are sealed and matched to prevent fluid leakage. At the same time, the valve core 200 and the valve seat 300 work together to change the throttling area, thereby realizing the regulation of the fluid flow and pressure. In a normal state, the valve core 200 and the valve seat 300 of the normally open solenoid valve maintain a certain opening to allow fluid to pass through.

[0038] The normally open solenoid valve forms an open state and a closed state during use. In the open state, the distance between the valve core 200 and the valve seat 300 reaches the maximum value, the channel is fully open, and the fluid can pass smoothly; in the closed state, the valve core 200 and the valve seat 300 are in close contact, sealing the channel and preventing the fluid from flowing. The process of the normally open solenoid valve from the open state to the closed state is the closed stage, and the process of the normally open solenoid valve from the closed state to the open state is the open stage.

[0039] Since the valve core 200 and the valve seat 300 of the conventional normally open solenoid valve only have a single plane contact when the valve is in the closed state, there may be a slight deviation or unevenness between the valve core 200 and the valve seat 300, which may lead to the possibility of leakage when the valve is in the closed state.

[0040] like Figure 3-Figure 8 As shown, in order to improve the sealing performance of the normally open solenoid valve in the closed state, the valve core 200 includes a first valve core 210, and a plurality of sealing contact surfaces are provided on the first valve core 210. An elastic sealing ring 310 is fixedly provided on the valve seat 300, and in the closed state, the elastic sealing ring 310 is in contact with the plurality of sealing contact surfaces.

[0041] The valve core 200 includes a second valve core 220, which is coaxially arranged inside the first valve core 210. The first valve core 210 and the second valve core 220 form a moving channel, and the moving channel enables the elastic sealing ring 310 to accurately contact multiple sealing contact surfaces when the valve is closed.

[0042] Specifically, a polygonal groove is provided on the first valve core 210 , and an elastic sealing ring 310 is provided on the end of the valve seat 300 that contacts the valve core 200 .

[0043] The second valve core 220 is coaxially arranged inside the first valve core 210, and the edge of the first valve core 210 extends out of the first cylinder 211 along the central axis of the first valve core 210, and the edge of the second valve core 220 extends out of the second cylinder 221 along the central axis of the second valve core 220. The inner peripheral wall surface of the first cylinder 211 and the outer peripheral wall surface of the second cylinder 221 form a moving channel for the elastic sealing ring 310 to move.

[0044] In the valve closing stage, after the valve core 200 is pressed down a short distance, the elastic sealing ring 310 can accurately enter the moving channel between the first cylinder 211 and the second cylinder 221, and the distance between the elastic sealing ring 310 and the multiple sealing contact surfaces in the moving channel gradually decreases until the elastic sealing ring 310 completely contacts the multiple sealing contact surfaces. In the valve closing state, the valve core 200 squeezes the elastic sealing ring 310, so that the elastic sealing ring 310 enters the polygonal groove, and the elastic sealing ring 310 is deformed to a certain extent by the pressure of the valve core 200, and the elastic sealing ring 310 contacts the multiple inner peripheral walls of the polygonal groove.

[0045] In the valve opening stage, the elastic sealing ring 310 moves downward in the moving channel, and the multiple sealing contact surfaces and the elastic sealing ring 310 are no longer in contact. The elastic sealing ring 310 moves away from the valve core 200 until it is separated from the first cylinder 211 and the second cylinder 221. Subsequently, the elastic sealing ring 310 continues to move a small distance, reaches the maximum distance between the valve core 200 and the valve seat 300, and stops moving. In the valve opening state, the elastic sealing ring 310 does not enter the moving channel.

[0046] The multi-sided groove has multiple inner circumferential walls, which increases the contact area between the elastic sealing ring 310 and the valve core 200. When the sealing contact area increases, the resistance that the fluid needs to overcome to leak through the sealing interface increases, thereby enhancing the sealing effect. At the same time, the elastic sealing ring 310 contacts multiple inner circumferential walls of the multi-sided groove to form multiple sealing sections. If the sealing performance of a certain local area of ​​the elastic sealing ring 310 decreases due to pressure, wear, etc., other contact parts can still continue to play a sealing role to prevent fluid leakage.

[0047] Thus, by making the elastic sealing ring 310 contact with multiple sealing contact surfaces in the valve closing state, the reliability and stability of the sealing system are improved, so that the elastic sealing ring 310 can maintain good sealing performance under different working conditions, and the sealing effect is enhanced. The moving channel formed by the first cylinder 211 and the second cylinder 221 can provide a strong radial constraint on the elastic sealing ring 310. The elastic sealing ring 310 can accurately contact multiple sealing contact surfaces in the valve closing stage, and is not prone to radial deviation or distortion.

[0048] Furthermore, when the elastic sealing ring 310 contacts multiple sealing contact surfaces, the pressure generated during the valve closing phase can be effectively dispersed to multiple points or regions. Multiple sealing contact surfaces make the pressure distribution more uniform, avoiding the sealing failure problem of the elastic sealing ring 310 caused by excessive local pressure.

[0049] In one embodiment, if Figure 3-Figure 8 As shown, in order to improve the reliability of the sealing performance of the elastic sealing ring 310, in the valve closing stage, the first valve core 210 and the second valve core 220 contact the elastic sealing ring 310. In the valve closing state, the inner peripheral wall of the first valve core 210, the inner peripheral top wall of the first valve core 210 and the outer peripheral wall of the second valve core 220 are sealing contact surfaces.

[0050] Specifically, a plurality of sealing contact surfaces are provided on the first valve core 210 and the second valve core 220. The distance between the inner peripheral wall surface of the first valve core 210 and the outer peripheral wall surface of the second valve core 220 is not greater than the outer diameter of the elastic sealing ring 310. The distance between the valve core 200 and the valve seat 300 is such that the elastic sealing ring 310 contacts the inner peripheral top wall of the first valve core 210 in the valve closing state.

[0051] In the valve closing stage, after the elastic sealing ring 310 enters the moving channel, it always contacts the inner peripheral wall surface of the first valve core 210 and the outer peripheral wall surface of the second valve core 220, and the first valve core 210 and the second valve core 220 begin to squeeze the elastic sealing ring 310. At the end of the valve closing stage, the elastic sealing ring 310 contacts the inner peripheral top wall of the first valve core 210. In the valve closing state, the elastic sealing ring 310 contacts the inner peripheral wall surface of the first valve core 210, the inner peripheral top wall of the first valve core 210, and the outer peripheral wall surface of the second valve core 220.

[0052] In the valve opening stage, the first valve core 210 and the second valve core 220 gradually move away from the elastic sealing ring 310. When the elastic sealing ring 310 moves down in the moving channel, it contacts the inner peripheral wall surface of the first valve core 210 and the outer peripheral wall surface of the second valve core 220. When the elastic sealing ring 310 leaves the moving channel, the elastic sealing ring 310 no longer contacts the first valve core 210 and the second valve core 220. In the valve opening state, the elastic sealing ring 310 is no longer squeezed.

[0053] The distance between the inner peripheral wall of the first valve core 210 and the outer peripheral wall of the second valve core 220 is not greater than the outer diameter of the elastic sealing ring 310. During the valve closing process, the valve core 200 will squeeze the elastic sealing ring 310, causing the elastic sealing ring 310 to undergo elastic deformation, further filling the small gap between the sealing surfaces. At the same time, the sealing contact surface is set on the first valve core 210 and the second valve core 220, so that the shape and position of the elastic sealing ring 310 during the pressure process are more stable. As a result, the reliability of the sealing performance is enhanced.

[0054] In one embodiment, if Figure 3-Figure 8 As shown, during the valve closing stage, the first valve core 210, the second valve core 220 and the elastic sealing ring 310 will be subjected to a large impact force, which will affect the service life of the valve core 200 and the elastic sealing ring 310, and may also cause the sealing performance of the normally open solenoid valve to decrease, thereby affecting the normal operation of the entire system.

[0055] In order to reduce the negative impact of the impact force on the first valve core 210, the second valve core 220 and the elastic sealing ring 310, during the valve closing stage, the first valve core 210, the second valve core 220 and the elastic sealing ring 310 form a short buffer cavity, which is used to reduce the impact force on the first valve core 210, the second valve core 220 and the elastic sealing ring 310.

[0056] Specifically, in the valve closing stage, the elastic sealing ring 310 moves closely against the first valve core 210 and the second valve core 220. In this process, the elastic sealing ring 310, the first valve core 210 and the second valve core 220 form a relatively closed buffer cavity. The elastic sealing ring 310 will deform to a certain extent when the pressure is high. As the valve closing process proceeds, the pressure in the buffer cavity continues to increase, the elastic sealing ring 310 deforms, and the fluid in the buffer cavity can flow out of the buffer cavity.

[0057] In the valve closing state, the buffer cavity has no fluid or a small amount of fluid. In the valve opening stage, the buffer cavity formed by the elastic sealing ring 310, the first valve core 210 and the second valve core 220 has fluid entering the buffer cavity when the elastic sealing ring 310 moves away from the valve core 200. In the valve opening state, the elastic sealing ring 310, the first valve core 210 and the second valve core 220 no longer form a buffer cavity.

[0058] Since the fluid has a buffering capacity, when the first valve core 210 and the second valve core 220 generate an impact force in the valve closing stage, the impact force will act on the fluid in the buffer chamber. The fluid in the buffer chamber can absorb and disperse the impact force, thereby reducing the impact force directly acting on the first valve core 210, the second valve core 220 and the elastic sealing ring 310. Therefore, by providing the buffer chamber, the damage to the first valve core 210, the second valve core 220 and the elastic sealing ring 310 caused by the impact force generated by the normally open solenoid valve in the valve closing stage is effectively reduced.

[0059] In one embodiment, if Figure 3-Figure 8 As shown, in order to improve the sealing performance, a fluid channel 320 is provided on the valve seat 300 , and the fluid channel 320 allows the fluid to fill the elastic sealing ring 310 .

[0060] Specifically, a fluid channel 320 is provided on the valve seat 300, and a two-way valve is provided in the fluid channel 320, so that the fluid can always enter and fill the elastic sealing ring 310 through the fluid channel 320. When the elastic sealing ring 310 is subjected to pressure, the fluid in the elastic sealing ring 310 flows out of the elastic sealing ring 310.

[0061] In the valve closing stage, the valve core 200 moves toward the valve seat 300 and begins to squeeze the elastic sealing ring 310. At this time, the fluid pressure inside the elastic sealing ring 310 rises, making the elastic sealing ring 310 more closely fit the valve core 200. When the squeezing force of the valve core 200 on the elastic sealing ring 310 is too large, the pressure inside the elastic sealing ring 310 also increases accordingly. When the internal pressure of the elastic sealing ring 310 exceeds a certain threshold, the two-way valve opens, allowing part of the fluid in the elastic sealing ring 310 to flow out, reducing the internal pressure, avoiding excessive deformation or damage of the elastic sealing ring 310, and maintaining a suitable sealing pressure.

[0062] In the valve closing state, the two-way valve is fine-tuned according to the pressure difference between the inside and outside of the elastic sealing ring 310 to ensure that the inside of the elastic sealing ring 310 maintains appropriate pressure and maintains a close fit between the elastic sealing ring 310 and the valve core 200.

[0063] In the valve opening stage, the two-way valve adjusts the pressure inside the elastic sealing ring 310 as needed so that the valve core 200 can move smoothly. In the valve opening state, the two-way valve allows fluid to flow into and fill the elastic sealing ring 310 through the fluid channel 320.

[0064] When the fluid fills the elastic sealing ring 310 , the pressure of the fluid will cause the elastic sealing ring 310 to expand outward and fit the valve core 200 more closely, thereby improving the sealing performance.

[0065] It is understandable that filling the elastic sealing ring 310 with fluid can improve the adaptability of the normally open solenoid valve to temperature changes and pressure changes. In high or low temperature environments, the elastic sealing ring 310 material may expand and contract, resulting in reduced sealing performance. After the elastic sealing ring 310 is filled with fluid, the pressure of the fluid can compensate for the dimensional changes of the elastic sealing ring 310 caused by temperature changes, thereby maintaining the stability of the sealing effect.

[0066] In one embodiment, if Figure 3-Figure 8 As shown, the fluid always fills the elastic sealing ring 310. When the valve core 200 moves upward, the valve core 200 and the elastic sealing ring 310 will generate greater friction. In order to reduce the friction between the valve core 200 and the elastic sealing ring 310, the fluid channel 320 includes a water inlet 321 and a water outlet 322. The fluid channel 320 is provided with a first one-way valve at one end of the water inlet 321, and a second one-way valve at one end of the water outlet 322. The first one-way valve and the second one-way valve limit the fluid to fill the elastic sealing ring 310 only when the valve is closed. In the closed state, the first valve core 210 limits the fluid from flowing out of the elastic sealing ring 310.

[0067] Specifically, the water inlet 321 is arranged inside the valve seat 300, and the water outlet 322 is arranged outside the valve seat 300. A first one-way valve is arranged at one end of the fluid channel 320 close to the water inlet 321, and a second one-way valve is arranged at one end of the fluid channel 320 close to the water outlet 322.

[0068] When the pressure on the side of the water inlet 321 is higher than the pressure in the elastic sealing ring 310, the pressure in the elastic sealing ring 310 is lower than the pressure on the side of the water outlet 322, and the fluid flows from the water inlet 321 into the fluid channel 320 and fills the elastic sealing ring 310. After the fluid fills the elastic sealing ring 310, the pressure in the elastic sealing ring 310 is higher than the pressure on the side of the water outlet 322, so that the fluid flows to the water outlet 322.

[0069] A blocking block is provided at the lower end of the first valve core 210. In the valve closing stage, the first valve core 210 drives the blocking block to accurately move to the position of the water outlet 322, restricting the fluid from flowing out of the elastic sealing ring 310, thereby ensuring the sealing performance.

[0070] When in the valve closing state, the valve core 200 moves downward, and when the pressure on the side of the water inlet 321 is higher than the pressure in the elastic sealing ring 310, the first one-way valve opens, and the fluid flows from the water inlet 321 into the fluid channel 320 and fills the elastic sealing ring 310. When the first valve core 210 is close to the closed position, the block at the lower end of the first valve core 210 moves accurately to the position of the water outlet 322, completely blocking the outflow of the fluid, ensuring that the elastic sealing ring 310 is always filled with fluid in the valve closing state, maintaining a good sealing effect.

[0071] When in the valve opening stage, the valve core 200 moves upward. Since the elastic sealing ring 310 is filled with fluid and the internal pressure of the elastic sealing ring 310 is higher than the pressure on the side of the water outlet 322, the second one-way valve opens and the fluid in the elastic sealing ring 310 flows out through the water outlet 322.

[0072] As the fluid flows out, the pressure in the elastic sealing ring 310 gradually decreases, and the squeezing effect on the valve core 200 is weakened, thereby reducing the friction between the valve core 200 and the elastic sealing ring 310 when the valve core 200 moves upward.

[0073] In other embodiments, a baffle may be used instead of providing a blocking block on the first valve core 210 .

[0074] Specifically, a baffle is installed at the water outlet 322, and the baffle is used to physically block the fluid channel 320, so as to control the outflow of the fluid in the elastic sealing ring 310, thereby achieving the purpose of ensuring the sealing performance and reducing the friction between the valve core 200 and the elastic sealing ring 310 under different valve states.

[0075] In the valve closing stage, the valve core 200 moves downward. At the same time, the transmission mechanism (such as a connecting rod, a gear, etc.) connected to the baffle plate starts to move, driving the baffle plate to move toward the water outlet 322. This transmission mechanism can be directly driven by the movement of the valve core 200, or it can be controlled by an independent control system according to the position signal of the valve core 200.

[0076] When the valve is in the closed state, as the valve core 200 approaches the closed position, the baffle moves accurately to the water outlet 322 and fits tightly around the water outlet 322. Due to the blocking effect of the baffle, the fluid cannot flow out of the water outlet 322, and the pressure in the elastic sealing ring 310 gradually increases, which fits tightly to the valve core 200 to form a good sealing effect.

[0077] When in the valve opening stage, the valve core 200 moves upward. The transmission mechanism responds again, driving the baffle to move away from the water outlet 322, thereby releasing the blockage of the water outlet 322. After the baffle is removed, the pressure in the elastic sealing ring 310 is higher than the pressure on the side of the water outlet 322, the second one-way valve opens, and the fluid in the elastic sealing ring 310 flows out through the water outlet 322. As the fluid flows out, the amount of fluid in the elastic sealing ring 310 decreases, and its squeezing effect on the valve core 200 is weakened, and the friction between the valve core 200 and the elastic sealing ring 310 is also reduced.

[0078] In one embodiment, if Figure 3-Figure 8As shown, in order to solve the problem that the traditional normally open solenoid valve cannot adjust the sealing performance according to the water pressure, the second valve core 220 is movably connected to the first valve core 210, and the second valve core 220 is provided with an extrusion surface. The water pressure can drive the second valve core 220 to move forward, and the forward movement of the second valve core 220 drives the extrusion surface to extrude the elastic sealing ring 310. The forward movement distance of the second valve core 220 and the extrusion degree of the elastic sealing ring 310 are positively correlated.

[0079] Specifically, when in the valve closing state, the second valve core 220 can move according to the magnitude of the water pressure. When the water pressure is low, the first valve core 210 and the second valve core 220 do not move relative to each other. When the water pressure increases, the force generated by the water pressure squeezes the second valve core 220, causing the second valve core 220 to move upward against its own gravity.

[0080] An extrusion surface with a certain inclination angle is provided on the second valve core 220, so that the contact point and contact area between the elastic sealing ring 310 and the second valve core 220 change during the movement of the second valve core 220. When the extrusion surface contacts the elastic sealing ring 310 at different positions, the magnitude and direction of the pressure applied by the second valve core 220 to the elastic sealing ring 310 will also change accordingly. When the water pressure is relatively low, the force generated by the water pressure is not enough to make the second valve core 220 overcome its own gravity and move, and the second valve core 220 does not exert additional extrusion force on the elastic sealing ring 310. When the water pressure is relatively high, the extrusion surface of the second valve core 220 can cause the elastic sealing ring 310 to be subjected to greater extrusion, thereby increasing the contact area and contact pressure between the elastic sealing ring 310 and the first valve core 210 and the second valve core 220.

[0081] As a result, the normally open solenoid valve can automatically adjust the sealing performance according to the pressure of the fluid, which greatly improves the sealing stability of the normally open solenoid valve under different water pressure environments, effectively prevents medium leakage, and improves the safety and reliability of the normally open solenoid valve.

[0082] In one embodiment, if Figure 3-Figure 8 As shown, in order to avoid adverse effects caused by the instantaneous application of high water pressure to the second valve core 220, an elastic member 222 is provided between the first valve core 210 and the second valve core 220. The elastic force of the elastic member 222 always makes the first valve core 210 and the second valve core 220 move away from each other or have a tendency to move away from each other.

[0083] Specifically, when the water pressure is low, the force generated by the water pressure is smaller than the elastic force of the elastic member 222, and the second valve core 220 maintains a relative position under the elastic force, and does not squeeze the elastic sealing ring 310. When the force generated by the water pressure is greater than the elastic force of the elastic member 222, the second valve core 220 begins to overcome the elastic force of the elastic member 222 and move toward the first valve core 210, and the squeezing surface of the second valve core 220 squeezes the elastic sealing ring 310.

[0084] The elastic member 222 can play a buffering role. When the water pressure suddenly increases, the elastic member 222 will first absorb a portion of the energy, so that the movement of the second valve core 220 is more stable, reducing the impact on other components.

[0085] During long-term use of the normally open solenoid valve, various substances will inevitably adhere to the outer peripheral wall of the elastic sealing ring 310. These attached substances will have a serious negative impact on the sealing performance of the elastic sealing ring 310, causing leakage in the normally open solenoid valve and reducing the service life of the normally open solenoid valve.

[0086] In one embodiment, if Figure 3-Figure 8 As shown, in order to reduce the influence of attached substances on the sealing performance of the elastic sealing ring 310, a first bump 212 is provided on the first valve core 210, and a second bump 223 is provided on the second valve core 220. The first bump 212 and the second bump 223 are used to scrape off substances on the outer peripheral wall of the elastic sealing ring 310.

[0087] Specifically, a first protrusion 212 is provided at one end of the first valve core 210 that first contacts the elastic sealing ring 310, and a second protrusion 223 is provided at one end of the second valve core 220 that first contacts the elastic sealing ring 310. In the valve closing stage, the first protrusion 212 moves with the first valve core 210, and the second protrusion 223 moves with the second valve core 220. When the first protrusion 212 and the second protrusion 223 contact the elastic sealing ring 310, the first protrusion 212 and the second protrusion 223 scrape off substances on the surface of the elastic sealing ring 310, so that the substances on the surface of the elastic sealing ring 310 are separated from the elastic sealing ring 310, and the surface of the elastic sealing ring 310 is kept clean.

[0088] Therefore, by setting the first protrusion 212 and the second protrusion 223 to scrape away the material on the outer peripheral wall of the elastic sealing ring 310, the elastic sealing ring 310 can achieve a closer and more fitting contact with the valve core 200, effectively reducing the sealing gap caused by impurities and other substances, thereby greatly improving the sealing performance of the normally open solenoid valve.

[0089] In one embodiment, in order to facilitate replacement of the elastic sealing ring 310 , the elastic sealing ring 310 is detachably connected to the valve seat 300 .

[0090] Specifically, the elastic sealing ring 310 is extended with a plurality of connecting buckles, and a plurality of threaded openings are provided on the valve seat 300. Screws pass through the connecting buckles to fix the elastic sealing ring 310 on the valve seat 300. Thus, the replacement and fixing of the elastic sealing ring 310 is achieved.

[0091] The technical features of the above embodiments may be combined arbitrarily. To make the description concise, not all possible combinations of the technical features in the above embodiments are described. However, as long as there is no contradiction in the combination of these technical features, they should be considered to be within the scope of this specification.

[0092] The above-described embodiments only express several implementation methods of the present invention, and the description thereof is relatively specific and detailed, but it cannot be understood as limiting the scope of the present invention. It should be pointed out that, for a person of ordinary skill in the art, several modifications and improvements can be made without departing from the concept of the present invention, and these all belong to the protection scope of the present invention. Therefore, the protection scope of the present invention shall be subject to the attached claims.

Claims

1. A water conservancy pipeline flow control valve, characterized in that: include: A valve core, the valve core comprising a first valve core, the first valve core being provided with a plurality of sealing contact surfaces; A valve seat, on which an elastic sealing ring is fixedly arranged, and when the valve is in a closed state, the elastic sealing ring is in contact with the plurality of sealing contact surfaces; The valve core comprises a second valve core, the second valve core is coaxially arranged inside the first valve core, the first valve core and the second valve core form a moving channel, and the moving channel enables the elastic sealing ring to accurately contact the plurality of sealing contact surfaces in the valve closing state; The valve seat is provided with a fluid channel, and the fluid channel is used to allow the fluid to enter and fill the elastic sealing ring; The fluid channel comprises a water inlet and a water outlet, wherein a first one-way valve is arranged at one end of the water inlet of the fluid channel, and a second one-way valve is arranged at one end of the water outlet of the fluid channel, wherein the first one-way valve and the second one-way valve restrict the fluid from filling the elastic sealing ring only when the valve is closed; In the valve closing state, the first valve core restricts the fluid from flowing out of the elastic sealing ring; The second valve core is movably connected to the first valve core, and the second valve core is provided with an extrusion surface. The water pressure can drive the second valve core to move forward. The forward movement of the second valve core drives the extrusion surface to extrude the elastic sealing ring. The forward movement distance of the second valve core is positively correlated with the extrusion degree of the elastic sealing ring. An elastic member is arranged between the first valve core and the second valve core, and the elastic force of the elastic member always makes the first valve core and the second valve core move away from each other or have a tendency to move away from each other.

2. A water conservancy pipeline flow control valve according to claim 1, characterized in that: In the valve closing stage, the first valve core and the second valve core contact the elastic sealing ring. In the valve closing state, the inner peripheral wall surface of the first valve core, the inner peripheral top wall of the first valve core and the outer peripheral wall surface of the second valve core are the sealing contact surfaces.

3. A water conservancy pipeline flow control valve according to claim 2, characterized in that: In the valve closing stage, the first valve core, the second valve core and the elastic sealing ring form a buffer chamber, and the buffer chamber is used to reduce the impact force on the first valve core, the second valve core and the elastic sealing ring.

4. A water conservancy pipeline flow control valve according to claim 1, characterized in that: The first valve core is provided with a first convex block, and the second valve core is provided with a second convex block. The first convex block and the second convex block are used to scrape off the material on the outer peripheral wall surface of the elastic sealing ring.

5. The water conservancy pipeline flow control valve according to any one of claims 1 to 4, characterized in that: The elastic sealing ring is detachably connected to the valve seat.

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