Multi-stage sealed ultra-high pressure foot valve spool structure

Abstract

The utility model discloses a kind of multistage sealed ultrahigh pressure foot valve valve core structures, belong to foot valve field, including valve sleeve mechanism and valve stem mechanism, the valve sleeve mechanism includes the valve core cylinder with multistep sealed contact surface, at least two through holes are opened on the valve core cylinder around its axis position, the inner wall and outer wall of the valve core cylinder are respectively provided with first sealing assembly and second sealing assembly, and the position of valve core cylinder close to its end part is provided with the protruding piece that can realize valve core self-cleaning, the valve stem mechanism is coaxially arranged with valve core cylinder, and the on-off control of foot valve is realized by the movement of valve stem mechanism, the valve stem mechanism includes the valve core rod of being sleeved on valve core cylinder, and the end of the valve core rod extending to valve core cylinder outside is provided with top head. The multistage sealed ultrahigh pressure foot valve valve core structure, improve valve core sealing property by multistage sealing design, valve core can be realized self-cleaning flushing when using, prevent particle deposition.

Description

Technical Field

[0001] This utility model relates to the field of foot valve technology, and in particular to a multi-stage sealing ultra-high pressure foot valve core structure. Background Technology

[0002] In high-pressure water jet cleaning operations, the opening and closing control of the high-pressure water flow is the core link to ensure operational efficiency and safety. As the core functional component that directly controls the opening and closing of the high-pressure water flow, the performance stability of the foot valve core directly determines the working efficiency and safety level of the entire system.

[0003] However, under high-pressure environments (such as 1500 bar), existing foot valve cores have the following problems: 1. Existing valve cores generally rely on a single hard seal or flexible seal design. Under continuous ultra-high pressure, the seals are prone to permanent compression deformation or aging damage, which cannot guarantee long-term sealing reliability; 2. Existing valve cores lack anti-accumulation design. Particles in the water being transported are prone to deposit between the valve core and the valve body sealing surface, which will damage the flatness of the sealing surface and lead to sealing failure. Utility Model Content

[0004] The purpose of this invention is to solve the problem that the existing foot valve core structure adopts a single sealing structure, which affects the sealing under high pressure, and that particulate matter in the conveyed water flow is prone to deposit between the sealing surface of the valve core and the valve body, leading to sealing failure. Therefore, a multi-stage sealing ultra-high pressure foot valve core structure is proposed.

[0005] To achieve the above objectives, this utility model employs the following technology: a multi-stage sealed ultra-high pressure foot valve core structure, comprising:

[0006] A valve sleeve mechanism, comprising a valve core cylinder having a multi-step sealing contact surface, wherein at least two through holes are provided on the valve core cylinder around its axis, and a first sealing component and a second sealing component are respectively provided on the inner wall and outer wall of the valve core cylinder, and a protrusion capable of self-cleaning the valve core is provided on the valve core cylinder near its end.

[0007] The valve stem mechanism is arranged coaxially with the valve core cylinder, and the on / off control of the foot valve is achieved by the movement of the valve stem mechanism.

[0008] As a further description of the above technical solution: the valve stem mechanism includes a valve stem sleeved on the valve core cylinder, a top head is provided at one end of the valve stem extending to the outside of the valve core cylinder, and a return spring is provided on the valve stem at a position between the valve core cylinder and the top head.

[0009] As a further description of the above technical solution: the inside of the valve core cylinder is provided with a moving channel, a connecting channel and a conveying channel in sequence along the direction of water flow out.

[0010] The valve core rod is slidably installed in the moving channel, and the through hole is connected to the connecting channel.

[0011] As a further description of the above technical solution: a conical sealing section is provided between the connecting channel and the conveying channel, and a sealing head that matches the sealing section is provided at the end of the valve core rod.

[0012] As a further description of the above technical solution: the first sealing assembly includes a hard sealing ring disposed on the inner wall of the valve core cylinder, and a flexible sealing ring disposed on the hard sealing ring that fits against the inner wall of the valve core cylinder.

[0013] As a further description of the above technical solution: the second sealing assembly includes a flexible spare ring and a high-pressure O-ring disposed on the outer wall of the valve core cylinder.

[0014] As a further description of the above technical solution: the number of protrusions is at least two, the protrusions abut against the annular flushing groove on the sealing surface of the foot valve body, and the protrusions can form a flushing channel with the annular flushing groove.

[0015] In summary, due to the adoption of the above technical solution, the beneficial effects of this utility model are:

[0016] With the dual sealing design of the first and second sealing components, even if the main seal is slightly worn due to long-term use, the secondary seal can still block the high-pressure water leakage path, effectively avoiding problems such as sudden drop in system pressure and operation interruption caused by the failure of a single seal, and significantly improving the sealing stability and service life of the valve core under ultra-high pressure conditions.

[0017] An annular flushing groove is provided between the front end of the valve core and the sealing surface of the valve body. The high-speed water flow when the valve core is opened can achieve self-cleaning flushing, which can promptly flush away the small particles accumulated on the sealing surface, avoid the formation of a deposit layer on the sealing surface, prevent the valve core from being scratched on the sealing surface and the sealing gap from increasing due to particle deposition, and reduce leakage failures caused by deposits. Attached Figure Description

[0018] Figure 1 A cross-sectional schematic diagram according to an embodiment of the present invention is shown;

[0019] Figure 2 A schematic diagram of the structure according to an embodiment of the present utility model is shown;

[0020] Figure 3 A schematic diagram of the valve sleeve mechanism according to an embodiment of the present invention is shown;

[0021] Figure 4 A schematic diagram of the valve stem mechanism provided according to an embodiment of the present invention is shown.

[0022] Legend:

[0023] 10. Valve sleeve mechanism; 11. Valve core cylinder; 12. Moving channel; 13. Connecting channel; 14. Conveying channel; 15. Through hole; 16. Sealing section; 17. First sealing assembly; 18. Second sealing assembly; 19. Protrusion;

[0024] 20. Valve stem mechanism; 21. Valve core rod; 22. Top head; 23. Return spring; 24. Sealing head. Detailed Implementation

[0025] 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 skilled in the art without creative effort are within the protection scope of the present utility model.

[0026] Reference Figures 1-4 This embodiment provides a multi-stage sealing ultra-high pressure foot valve core structure, including a valve sleeve mechanism 10 and a valve stem mechanism 20. The valve sleeve mechanism 10 includes a valve core cylinder 11 with multi-step sealing contact surfaces. At least two through holes 15 are formed on the valve core cylinder 11 around its axis. The valve stem mechanism 20 is coaxially arranged with the valve core cylinder 11. The on / off control of the foot valve is achieved by the movement of the valve stem mechanism 20. The valve stem mechanism 20 includes a valve core rod 21 sleeved on the valve core cylinder 11. One end of the valve core rod 21 extending outside the valve core cylinder 11 is provided with... A top head 22 is provided, and a return spring 23 is provided on the valve core rod 21 at a position between the valve core cylinder 11 and the top head 22. The valve core cylinder 11 has a moving channel 12, a connecting channel 13 and a conveying channel 14 arranged sequentially in the direction of water flow. The valve core rod 21 is slidably installed in the moving channel 12. The through hole 15 is connected to the connecting channel 13. A conical sealing section 16 is provided between the connecting channel 13 and the conveying channel 14, and a sealing head 24 that cooperates with the sealing section 16 is provided at the end of the valve core rod 21.

[0027] In this invention, when the foot valve is not operated, the return spring 23 is in a naturally extended state. At this time, there is a space between the sealing head 24 at the end of the valve core rod 21 and the sealing section 16 of the valve core cylinder 11, allowing water to enter the valve core cylinder 11 through the through hole 15 and then through the space between the sealing head 24 and the sealing section 16 into the conveying channel 14. This allows high-pressure water to enter the spray gun pipe through the conveying channel 14. When the operator steps on the foot valve, the pedal driving force is transmitted to the valve core rod 21 through the top head 22, overcoming the elastic force of the return spring 23 and pushing the valve core rod 21 to slide along the moving channel 12 in the direction of water flow. Then, the sealing head 24 at the end of the valve core rod 21 fits against the sealing section 16 inside the valve core cylinder 11, blocking the conveying space between the through hole 15 and the conveying channel 14, thereby cutting off the water flow. After releasing the pedal, the return spring 23 returns to its naturally extended state, and the elastic force pushes the valve core rod 21 along the moving channel 12. The flow retracts, and the conveying space between the through hole 15 and the conveying channel 14 reopens, enabling water flow conveying.

[0028] It should be noted that the valve core cylinder 11 adopts a circular arc tapered shape, and its front end is formed by a stepped shape through coaxially arranged pipe sections with gradually decreasing diameter. When the valve core is connected to the foot valve block, its multi-step sealing contact surface design can ensure reliable sealing at different pressure stages. In addition, multiple through holes 15 are evenly arranged around the axis of the valve core cylinder 11, which can disperse the impact pressure of the ultra-high pressure water flow to the wall area corresponding to the multiple through holes 15, making the overall force on the valve core cylinder 11 more uniform and avoiding the risk of local overload.

[0029] Specifically, the inner and outer walls of the valve core cylinder 11 are respectively provided with a first sealing component 17 and a second sealing component 18. The first sealing component 17 includes a hard sealing ring disposed on the inner wall of the valve core cylinder 11, and a flexible sealing ring disposed on the hard sealing ring that fits against the inner wall of the valve core cylinder 11. The second sealing component 18 includes a flexible sealing ring and a high-pressure O-ring disposed on the outer wall of the valve core cylinder 11.

[0030] The rigid sealing ring (such as hard alloy or wear-resistant stainless steel) is fixed to the inner wall of the valve core cylinder 11. Its inner diameter is precisely matched with the outer wall of the valve core rod 21. The rigid sealing ring provides stable structural support for the entire first sealing assembly 17 due to its rigidity, preventing the flexible sealing ring from shifting due to high pressure. The flexible sealing ring, such as high-pressure resistant fluororubber or polyurethane, is attached to the surface of the rigid sealing ring. Since the valve core rod 21 may have slight wobble during sliding, the flexible sealing ring has elastic deformation capability and can automatically fill these small gaps under high pressure. At the same time, the flexible material can reduce the frictional resistance between the valve core rod 21 and the sealing assembly when sliding, ensuring sealing reliability without affecting the smooth movement of the valve core rod 21.

[0031] High-pressure O-rings (such as hydrogenated nitrile rubber) are installed in the sealing groove on the outer wall of the valve core cylinder 11. When ultra-high pressure water flows onto the O-ring, the O-ring will undergo elastic deformation due to pressure, squeezing and filling the gap between the outer wall of the valve core cylinder 11 and the inner wall of the valve body, further improving the sealing effect and preventing water leakage from the radial gap. The flexible spare ring and the high-pressure O-ring are arranged side by side along the axial direction of the valve core cylinder 11. On the one hand, if the high-pressure O-ring experiences slight wear or aging due to long-term use, the flexible spare ring can immediately fill the sealing gap to prevent instantaneous leakage. On the other hand, the flexible spare ring can block small particles (such as rust debris and impurities) carried in the high-pressure water, preventing particles from entering between the high-pressure O-ring and the sealing surface, and extending the service life of the main seal.

[0032] Specifically, the valve core cylinder 11 is provided with a protrusion 19 near its end to enable the valve core to self-clean. There are at least two protrusions 19. The protrusions 19 abut against the annular flushing groove on the sealing surface of the foot valve body, and the protrusions 19 can form a flushing channel with the annular flushing groove.

[0033] When the protrusion 19 abuts against the annular flushing groove on the sealing surface of the foot valve body, multiple flushing channels will be formed between the protrusion 19 and the groove wall of the annular flushing groove. When the valve core is opened, the high-pressure water flow in the valve core cylinder 11 will flow out at high speed along the flushing channel, forcefully flushing away the particles attached to the sealing area (such as pipe rust debris and impurity particles carried in the high-pressure water), avoiding the accumulation of deposits, realizing automatic cleaning of the valve core sealing surface, and reducing the frequency of manual disassembly and cleaning.

[0034] The above description is only a preferred embodiment of the present utility model, but the protection scope of the present utility model is not limited thereto. Any equivalent substitutions or changes made by those skilled in the art within the technical scope disclosed in the present utility model, based on the technical solution and the inventive concept of the present utility model, should be included within the protection scope of the present utility model.

Claims

1. A multi-stage sealing ultra-high pressure foot valve core structure, characterized in that, include: The valve sleeve mechanism (10) includes a valve core cylinder (11) with a multi-step sealing contact surface. At least two through holes (15) are opened on the valve core cylinder (11) around its axis. The inner wall and outer wall of the valve core cylinder (11) are respectively provided with a first sealing component (17) and a second sealing component (18). The valve core cylinder (11) is provided with a protrusion (19) near its end that can realize the self-cleaning of the valve core. The valve stem mechanism (20) is arranged coaxially with the valve core cylinder (11). The movement of the valve stem mechanism (20) realizes the on / off control of the foot valve.

2. The valve core structure of a multi-stage sealed ultra-high pressure foot valve according to claim 1, characterized in that, The valve stem mechanism (20) includes a valve stem (21) sleeved on the valve core cylinder (11). A top head (22) is provided at one end of the valve stem (21) extending to the outside of the valve core cylinder (11), and a return spring (23) is provided on the valve stem (21) at a position between the valve core cylinder (11) and the top head (22).

3. The valve core structure of a multi-stage sealed ultra-high pressure foot valve according to claim 2, characterized in that, The valve core cylinder (11) is provided with a moving channel (12), a connecting channel (13) and a conveying channel (14) in sequence along the direction of water flow out. The valve core rod (21) is slidably installed in the moving channel (12), and the through hole (15) is connected to the connecting channel (13).

4. The valve core structure of a multi-stage sealed ultra-high pressure foot valve according to claim 3, characterized in that, A tapered sealing section (16) is provided between the connecting channel (13) and the conveying channel (14), and a sealing head (24) that cooperates with the sealing section (16) is provided at the end of the valve core rod (21).

5. The valve core structure of a multi-stage sealed ultra-high pressure foot valve according to claim 1, characterized in that, The first sealing assembly (17) includes a hard sealing ring disposed on the inner wall of the valve core cylinder (11), and a flexible sealing ring disposed on the hard sealing ring that fits against the inner wall of the valve core cylinder (11).

6. The valve core structure of a multi-stage sealed ultra-high pressure foot valve according to claim 1, characterized in that, The second sealing assembly (18) includes a flexible spare ring and a high-pressure O-ring disposed on the outer wall of the valve core cylinder (11).

7. The valve core structure of a multi-stage sealed ultra-high pressure foot valve according to claim 1, characterized in that, The number of protrusions (19) is at least two. The protrusions (19) abut against the annular flushing groove on the sealing surface of the foot valve body. The protrusions (19) can form a flushing channel with the annular flushing groove.

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