High-frequency wear-resistant impact-resistant check valve

Abstract

A valve element assembly is arranged in a valve body, a valve seat assembly is arranged in the valve body, the valve seat assembly and the valve body are in conical surface fit, the valve seat assembly comprises a valve seat supporting seat, a valve seat damping gasket is arranged on the valve seat supporting seat, a valve seat sealing ring is arranged on the valve seat damping gasket, and a valve seat pressing ring is arranged on the valve seat supporting seat. The valve seat pressing ring is in threaded connection with the valve seat supporting seat, the valve seat sealing ring and the valve seat damping gasket are pressed on the valve seat supporting seat, a first valve seat O-shaped ring and a second valve seat O-shaped ring are arranged on the valve seat supporting seat, a threaded hole is further formed in the valve body, and the threaded hole is communicated between the first valve seat O-shaped ring and the second valve seat O-shaped ring. The space among the valve body, the first valve seat O-shaped ring, the second valve seat O-shaped ring and the valve seat supporting seat is vacuumized through exhaust of the threaded holes, the valve seat assembly is fixed to the valve body, particles and silt can be discharged through the pressure relief and silt discharging holes, the hard sealing face is always located in a medium guide line through the upper guide angle and the lower guide angle, and the hard sealing face is prevented from being directly scoured by media.

Description

Technical Field

[0001] This invention relates to the field of valve technology, and specifically to a high-frequency wear-resistant and impact-resistant check valve. Background Technology

[0002] Existing high-frequency wear-resistant check valves are mostly used at the inlet and outlet of high-frequency diaphragm pumps. The medium is usually 40%-70% (by weight) or even higher, containing hard and sharp particles such as quartz sand, metal ore powder, tailings, coal slag, and ceramic raw materials. During use, particles and silt can damage the opening and closing sealing surfaces of the high-frequency wear-resistant check valve, and the high-frequency and high-pressure opening and closing can easily cause the valve core to fatigue and break. Summary of the Invention

[0003] To address the technical deficiencies of existing technologies, this invention provides a high-frequency wear-resistant and impact-resistant check valve.

[0004] The technical solution adopted in this invention is: a high-frequency wear-resistant and impact-resistant check valve, comprising a valve body, a valve cover on the valve body, a valve core assembly inside the valve body, a sliding fit between the upper valve shaft of the valve core assembly and the valve cover, a valve seat assembly inside the valve body, a conical fit between the valve seat assembly and the valve body, the valve seat assembly including a valve seat support, a valve seat damping pad on the valve seat support, a valve seat sealing ring on the valve seat damping pad, a sealing fit between the valve seat sealing ring and the valve core assembly, and the valve seat support... It is also provided with a valve seat pressure ring, which is threadedly connected to the valve seat support seat to press the valve seat sealing ring and the valve seat damping pad tightly onto the valve seat support seat. The valve seat support seat is installed with the valve body on a conical surface. The valve seat support seat is also provided with a valve seat O-ring one and a valve seat O-ring two. The valve body is also provided with a threaded hole, which is connected to the valve seat O-ring one and the valve seat O-ring two. The exhaust through the threaded hole evacuates the valve body, valve seat O-ring one, valve seat O-ring two and the valve seat support seat, and fixes the valve seat assembly (4) onto the valve body.

[0005] The threaded hole is also provided with a screw plug, and the valve seat support is provided with a limiting ring groove. After the screw plug is inserted into the threaded hole, it is in a limiting fit with the limiting ring groove of the valve seat support.

[0006] The valve seat sealing ring is provided with an upper pressure relief and sand discharge hole and a lower pressure relief and sand discharge hole, and the valve seat sealing ring between the upper pressure relief and sand discharge hole and the lower pressure relief and sand discharge hole is also provided with a first hard sealing surface.

[0007] Between the upper and lower pressure relief sand discharge holes, there is also a sand discharge trough and a sand discharge platform that discharge solid particles on the seal to both sides when closed.

[0008] The valve core assembly includes a valve core, a valve core sealing ring is provided on the valve core, and a valve core shock-absorbing pad is provided between the valve core sealing ring and the valve core.

[0009] The valve core sealing ring is provided with a valve core pressure ring, and the valve core pressure ring is provided with a reserved hole. The valve core pressure ring is threaded to the valve core through the reserved hole by fasteners to realize the valve core sealing ring on the valve core.

[0010] The valve core sealing ring is provided with a first dovetail O-ring groove and a second dovetail O-ring groove. A valve core sealing O-ring one and a valve core sealing O-ring two are respectively provided in the first dovetail O-ring groove and the second dovetail O-ring groove. The valve core sealing ring between the first dovetail O-ring groove and the second dovetail O-ring groove is also provided with a second hard sealing surface. When the valve is closed, the second hard sealing surface on the valve core sealing ring contacts the first hard sealing surface on the valve seat sealing ring.

[0011] The valve core sealing ring, together with valve core sealing O-ring one, valve core sealing O-ring two, and valve seat sealing ring, forms a sealing cavity. As the valve core assembly moves downward, the volume of the sealing cavity decreases and the internal pressure increases. The medium will be flushed out through the valve seat sealing ring and pressure relief hole, carrying away particles and mud.

[0012] The valve seat support is provided with a valve shaft guide hole in the middle, and the valve core is provided with a lower valve shaft, which is guided and engaged with the valve shaft guide hole.

[0013] The valve core is also provided with a spring groove, and a spring is provided in the spring groove. The spring is sleeved on the upper valve shaft.

[0014] The valve seat sealing ring is also provided with upper and lower guide angles and medium guide lines for guiding the entry of valve core sealing O-ring one and valve core sealing O-ring two, and for guiding the flow direction of the medium.

[0015] The beneficial effects of this invention are as follows: This invention provides a high-frequency wear-resistant and impact-resistant check valve, including a valve body, a valve cover on the valve body, a valve core assembly inside the valve body, a sliding fit between the upper valve shaft of the valve core assembly and the valve cover, a valve seat assembly inside the valve body, a conical fit between the valve seat assembly and the valve body, the valve seat assembly including a valve seat support, a valve seat damping pad on the valve seat support, a valve seat sealing ring on the valve seat damping pad, a sealing fit between the valve seat sealing ring and the valve core assembly, and a valve seat pressure ring on the valve seat support, the valve seat pressure ring being threadedly connected to the valve seat support to tightly press the valve seat sealing ring and the valve seat damping pad onto the valve body. The valve seat support is mounted on a conical surface with the valve body. The valve seat support is also equipped with valve seat O-ring 1 and valve seat O-ring 2. The valve body is also equipped with a threaded hole that connects to valve seat O-ring 1 and valve seat O-ring 2. The venting through the threaded hole creates a vacuum between the valve body, valve seat O-ring 1, valve seat O-ring 2, and valve seat support, fixing the valve seat assembly to the valve body. The vacuuming process securely locks the valve seat assembly to the valve body. The pressure relief and sand discharge holes can discharge particles and sand. The upper and lower guide angles ensure that the hard sealing surface is always within the medium guide line, preventing the hard sealing surface from being directly eroded by the medium. Attached Figure Description

[0016] Figure 1 This is a schematic diagram of the structure of the present invention.

[0017] Figure 2 This is a schematic diagram of the valve seat sealing ring structure of the present invention.

[0018] Figure 3 This is a schematic diagram of the valve core sealing ring of the present invention.

[0019] Figure 4 This is a schematic diagram of the mating structure of the valve core assembly and valve seat assembly of the present invention.

[0020] Among them, 1-valve body, 2-valve cover, 3-valve core assembly, 4-valve seat assembly, 31-valve core, 32-valve core sealing ring, 33-valve core damping pad, 34-valve core pressure ring, 35-valve core sealing O-ring one, 36-valve core sealing O-ring two, 37-valve shaft guide hole, 38-spring, 41-valve seat support, 42-valve seat damping pad, 43-valve seat sealing ring, 44-valve seat pressure ring, 45-valve seat O-ring 1, 46-valve seat O-ring 2, 47-screw plug, 48-limiting ring groove, 49-upper and lower guide angles, 50-medium guide line, 321-first dovetail O-ring groove, 322-second dovetail O-ring groove, 323-second hard sealing surface, 431-upper pressure relief and sand discharge hole, 432-lower pressure relief and sand discharge hole, 433-sand discharge groove, 434-sand discharge platform, 435-first hard sealing surface. Detailed Implementation

[0021] The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only a part of the embodiments of the present invention, and not all of them. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0022] A high-frequency wear-resistant and impact-resistant check valve includes a valve body 1, a valve cover 2 on the valve body 1, a valve core assembly 3 inside the valve body 1, an upper valve shaft of the valve core assembly 3 slidingly engaging with the valve cover 2, and a valve seat assembly 4 inside the valve body 1, the valve seat assembly 4 having a conical surface engagement with the valve body 1. The valve seat assembly 4 includes a valve seat support 41, a valve seat damping pad 42 on the valve seat support 41, and a valve seat sealing ring 43 on the valve seat damping pad 42, the valve seat sealing ring 43 sealingly engaging with the valve core assembly 3. A valve seat pressure ring 44 is also provided on the valve seat support 41. The valve seat pressure ring 44 is threadedly connected to the valve seat support 41, which tightly presses the valve seat sealing ring 43 and the valve seat damping pad 42 onto the valve seat support 41. The valve seat support 41 is taperedly mounted to the valve body 1. The valve seat support 41 is also provided with a valve seat O-ring 45 and a valve seat O-ring 46. The valve body 1 is also provided with a threaded hole that connects to the valve seat O-ring 45 and the valve seat O-ring 46. The venting through the threaded hole creates a vacuum between the valve body 1, the valve seat O-ring 45, the valve seat O-ring 46, and the valve seat support 41, thereby fixing the valve seat assembly 4 onto the valve body 1. The tapered design of the contact surface between the valve body and the valve seat assembly creates a pressure cross-sectional area difference between the upper and lower surfaces of the valve seat assembly. This pressure difference allows the medium to firmly press the valve seat assembly against the valve body. Furthermore, air is vented through the threads on the valve body, creating a vacuum between the valve seat support, valve body, and O-rings 1 and 2. This vacuum significantly increases the pressure of the medium flowing through the valve body, using the pressure difference to firmly lock the valve seat assembly onto the valve body. Finally, the lower end of the plug is inserted into the limiting ring groove on the valve seat support, forming a mechanical limit.

[0023] When disassembling the valve seat and valve body: unscrew the plug, inject high-pressure gas through the threaded hole on the valve body to separate the valve seat and valve body, and then disassemble.

[0024] The threaded hole is also provided with a screw plug 47, and the valve seat support 41 is provided with a limiting ring groove 48. After the screw plug 47 is inserted into the threaded hole, it is in a limiting fit with the limiting ring groove 48 of the valve seat support 41.

[0025] The valve seat sealing ring 43 is provided with an upper pressure relief and sand discharge hole 431 and a lower pressure relief and sand discharge hole 432. A first hard sealing surface 435 is also provided on the valve seat sealing ring 43 between the upper pressure relief and sand discharge hole 431 and the lower pressure relief and sand discharge hole 432. A sand discharge groove 433 and a sand discharge platform 434 are also provided between the upper pressure relief and sand discharge hole 431 and the lower pressure relief and sand discharge hole 432 to discharge solid particles on the seal to both sides when closed. The valve seat sealing ring is equipped with upper and lower pressure relief and sand discharge holes for sand discharge and pressure relief during sealing. The total area of ​​the holes is adjusted according to Bernoulli's equation to control the pressure and flow rate. It is equipped with a hard sealing surface for final sealing and impact resistance. It is equipped with a sand discharge trough and sand discharge platform to discharge solid particles on the seal to both sides when closed. It is equipped with upper and lower guide angles, which are used to guide the entry of the valve core sealing O-ring and to guide the flow direction of the medium, so that the hard sealing surface is always within the medium guide line and avoids the hard sealing surface being directly washed by the medium.

[0026] The valve core assembly 3 includes a valve core 31, a valve core sealing ring 32 is provided on the valve core, and a valve core shock-absorbing pad 33 is provided between the valve core sealing ring 32 and the valve core.

[0027] The valve core sealing ring 32 is provided with a valve core pressure ring 34. The valve core pressure ring 34 is provided with a reserved hole. The valve core pressure ring 34 is threaded to the valve core through the reserved hole by fasteners to realize the valve core sealing ring 32 on the valve core.

[0028] The valve core sealing ring 32 is provided with a first dovetail O-ring groove 321 and a second dovetail O-ring groove 322. A valve core sealing O-ring 1 35 and a valve core sealing O-ring 2 36 are respectively provided in the first dovetail O-ring groove 321 and the second dovetail O-ring groove. A second hard sealing surface 323 is also provided on the valve core sealing ring 32 between the first and second dovetail O-ring grooves. When the valve is closed, the second hard sealing surface on the valve core sealing ring 32 contacts the first hard sealing surface on the valve seat sealing ring 43. The hard sealing surface on the valve core sealing ring is used for final sealing and impact resistance. The upper and lower dovetail O-ring grooves serve two purposes: firstly, they tightly press the O-rings into the grooves, preventing them from falling off during vertical movement and impact; secondly, they facilitate O-ring replacement.

[0029] The valve core sealing ring 32, together with the valve core sealing O-ring one, the valve core sealing O-ring two, and the valve seat sealing ring 43, form a sealing cavity. As the valve core assembly 3 moves downward, the volume of the sealing cavity decreases and the internal pressure increases. The medium will be flushed out through the upper and lower sand discharge and pressure relief holes of the valve seat sealing ring 43, carrying away particles and mud.

[0030] During the shutdown process, such as Figure 4 The middle arrow indicates the pressure and flow direction of the medium;

[0031] The medium pushes the valve core downward. When the upper and lower valve core sealing O-rings contact the valve seat sealing ring simultaneously, a sealing cavity is formed. As the valve core continues to move downward, it further compresses the medium. According to Bernoulli's equation, the downward pressure area of ​​the sealing cavity is much larger than the total area of ​​the upper and lower sand discharge and pressure relief holes of the valve seat sealing ring. This causes the medium pressure in the sealing cavity to rise sharply, which will create a reverse medium thrust on the valve core, reducing the downward speed and impact pressure of the valve core until the valve core sealing ring contacts the sealing surface of the valve seat sealing ring. At this point, the remaining impact force is damped by the valve seat damping pad and the valve core damping pad.

[0032] During the pressurization process of the sealing cavity, some of the medium pressure will be discharged through the sand discharge and pressure relief holes of the valve seat sealing ring. According to Bernoulli's equation, the medium flow velocity will be greatly increased at this time, and there will be sufficient impact force to carry away a large number of particles and silt. When the sealing surface of the valve seat sealing ring contacts the sealing surface of the valve seat sealing ring, the remaining residual particles will be transported to the sand discharge grooves on both sides to avoid particle impurities in the sealing collision.

[0033] During the opening process: When the valve is opened, the medium force pushes the valve core to move upward, and the spring embedded in the upper end of the valve core provides shock absorption and buffering.

[0034] The valve seat support (41) is provided with a valve shaft guide hole (37) in the middle, and the valve core is provided with a lower valve shaft, which is guided and engaged with the valve shaft guide hole (37).

[0035] The valve core is also provided with a spring groove, and a spring (38) is provided in the spring groove. The spring (38) is sleeved on the upper valve shaft.

[0036] The valve seat sealing ring (43) is also provided with upper and lower guide angles (49) and medium guide lines (50) for guiding the entry of valve core sealing O-ring one and valve core sealing O-ring two and for guiding the flow direction of the medium.

[0037] Advantages of this invention: 1. Self-damping and deceleration structure design: During the process of closing the valve core, the principle of Bernoulli's equation is used to pressurize the medium in the sealing cavity, so that the medium in the sealing cavity produces a reverse medium pressure in the opposite direction. The faster the valve core descends, the greater its reverse medium pressure.

[0038] The specific actions are as follows: the medium pushes the valve core downward. When the upper and lower O-rings contact the valve seat sealing ring, a sealing cavity is formed. When the valve core continues to move downward, it will further compress the medium. According to Bernoulli's equation (adjusting the downward pressure area of ​​the sealing cavity to be much larger than the total area of ​​the upper and lower sand discharge and pressure relief holes of the valve seat sealing ring), the medium pressure in the sealing cavity will rise sharply, which will create a reverse medium thrust on the valve core, reducing the downward speed and impact pressure of the valve core.

[0039] 2. Auxiliary vibration damping design: Vibration damping pads are used on the back of both the valve core sealing ring and the valve seat sealing ring. After the valve core passes through the self-damping and deceleration structure, the descent speed of the valve core sealing ring will be greatly reduced. When the sealing surfaces collide, the vibration damping pads provide final shock absorption.

[0040] 3. Self-sand discharge design of sealing surface: While the sealing cavity is pressurized, the medium flow rate between the pressure relief and sand discharge holes on the valve seat sealing ring will be greatly improved, and mud, sand and particles will be carried away.

[0041] The specific actions are as follows: During the pressurization process of the sealing cavity, some of the medium pressure will be discharged through the sand discharge and pressure relief holes along with the valve seat sealing ring. According to Bernoulli's law, the medium flow rate will be greatly increased at this time, and there will be sufficient impact force to carry away a large number of particles and silt. When the sealing surface of the valve seat sealing ring is released from the sealing surface of the valve seat sealing ring, the remaining residual particles will be transported to the sand discharge grooves on both sides to avoid particle impurities in the sealing collision.

[0042] 4. Self-fixing valve seat structure: Installation principle between valve seat and valve body: The tapered design of the valve body and seat contact surfaces creates a pressure cross-sectional area difference between the upper and lower surfaces of the valve seat. This pressure difference forces the valve seat firmly against the valve body. Furthermore, air is vented through the threads on the valve body, creating a vacuum between the valve seat support, valve body, valve seat O-ring 1, and valve seat O-ring 2. This vacuum significantly increases the pressure of the medium flowing through the valve body, securing the valve seat firmly to the valve body. Additional mechanical limiting: The lower end of the plug inserts into the limiting ring groove on the valve seat support, forming a mechanical limit.

[0043] 5. The valve seat seal and valve core seal are designed to be replaceable and detachable.

[0044] 6. Replaceable O-ring design: The valve core sealing ring has upper and lower dovetail O-ring grooves, which can press the valve core sealing O-ring tightly into the groove to prevent the valve core sealing O-ring from falling off during the up and down movement impact, and facilitate the replacement of the valve core sealing O-ring.

[0045] 7. Easy-to-maintain valve seat seal design: After long-term use, the cross-sectional area of ​​the pressure relief and sand discharge holes on the valve seat seal ring will be eroded and enlarged, resulting in an increased cross-sectional area and reduced self-damping and deceleration function. In this case, the original pressure relief and sand discharge holes can be sealed and re-machined.

[0046] Please note to all technical personnel: Although the present invention has been described according to the specific embodiments above, the inventive concept of the present invention is not limited to this invention. Any modifications that utilize the inventive concept will be included within the scope of patent protection of this patent.

[0047] The above description is merely a preferred embodiment of the present invention. The scope of protection of the present invention is not limited to the above embodiments. All technical solutions falling within the scope of the present invention's concept are within the scope of protection of the present invention. It should be noted that for those skilled in the art, any improvements and modifications made without departing from the principle of the present invention should also be considered within the scope of protection of the present invention.

Claims

1. A high-frequency wear-resistant and impact-resistant check valve, comprising a valve body (1), a valve cover (2) provided on the valve body (1), and a valve core assembly (3) further provided inside the valve body (1), wherein the upper valve shaft of the valve core assembly (3) is in sliding fit with the valve cover (2), characterized in that, The valve body (1) is further provided with a valve seat assembly (4), which is in conical contact with the valve body (1). The valve seat assembly (4) includes a valve seat support (41), on which a valve seat damping pad (42) is provided. A valve seat sealing ring (43) is also provided on the valve seat damping pad (42), which is in sealing contact with the valve core assembly (3). A valve seat pressure ring (44) is also provided on the valve seat support (41), which is threadedly connected to the valve seat support (41) to connect the valve seat sealing ring (43) to the valve core assembly (3). The damping pad (42) is pressed tightly on the valve seat support (41). The valve seat support (41) and the valve body (1) are fitted together with a conical surface. The valve seat support (41) is also provided with a valve seat O-ring one (45) and a valve seat O-ring two (46). The valve body (1) is also provided with a threaded hole. The threaded hole is connected to the valve seat O-ring one (45) and the valve seat O-ring two (46). The exhaust through the threaded hole evacuates the valve body (1), valve seat O-ring one (45), valve seat O-ring two (46) and valve seat support (41), and fixes the valve seat assembly (4) on the valve body (1).

2. The high-frequency wear-resistant and impact-resistant check valve according to claim 1, characterized in that, The threaded hole is also provided with a screw plug (47), and the valve seat support (41) is provided with a limiting ring groove (48). After the screw plug (47) is inserted into the threaded hole, it is in a limiting fit with the limiting ring groove (48) of the valve seat support (41).

3. The high-frequency wear-resistant and impact-resistant check valve according to claim 1, characterized in that, The valve seat sealing ring (43) is provided with an upper pressure relief sand discharge hole (431) and a lower pressure relief sand discharge hole (432). The valve seat sealing ring (43) between the upper pressure relief sand discharge hole (431) and the lower pressure relief sand discharge hole (432) is also provided with a first hard sealing surface (435).

4. The high-frequency wear-resistant and impact-resistant check valve according to claim 3, characterized in that, Between the upper pressure relief sand discharge hole (431) and the lower pressure relief sand discharge hole (432), there is also a sand discharge trough (433) and a sand discharge platform (434) that discharge solid particles on the seal to both sides when closed.

5. A high-frequency wear-resistant and impact-resistant check valve according to claim 4, characterized in that, The valve core assembly (3) includes a valve core (31), a valve core sealing ring (32) is provided on the valve core, and a valve core shock-absorbing pad (33) is provided between the valve core sealing ring (32) and the valve core.

6. A high-frequency wear-resistant and impact-resistant check valve according to claim 5, characterized in that, The valve core sealing ring (32) is provided with a valve core pressure ring (34), and the valve core pressure ring (34) is provided with a reserved hole. The valve core pressure ring (34) is threaded to the valve core through the reserved hole by fasteners to realize the valve core sealing ring (32) on the valve core.

7. A high-frequency wear-resistant and impact-resistant check valve according to claim 6, characterized in that, The valve core sealing ring (32) is provided with a first dovetail O-ring groove (321) and a second dovetail O-ring groove (322). The first dovetail O-ring groove (321) and the second dovetail O-ring groove are respectively provided with a valve core sealing O-ring one (35) and a valve core sealing O-ring two (36). The valve core sealing ring (32) between the first dovetail O-ring groove (321) and the second dovetail O-ring groove is also provided with a second hard sealing surface (323). When the valve is closed, the second hard sealing surface on the valve core sealing ring (32) contacts the first hard sealing surface on the valve seat sealing ring (43).

8. A high-frequency wear-resistant and impact-resistant check valve according to claim 7, characterized in that, The valve core sealing ring (32), together with the valve core sealing O-ring one, the valve core sealing O-ring two, and the valve seat sealing ring (43), form a sealing cavity. As the valve core assembly (3) moves downward, the volume of the sealing cavity decreases and the internal pressure increases. The medium will be flushed out through the upper and lower sand discharge and pressure relief holes of the valve seat sealing ring (43), carrying away particles and mud.

9. A high-frequency wear-resistant and impact-resistant check valve according to claim 4, characterized in that, The valve seat support (41) is provided with a valve shaft guide hole (37) in the middle, and the valve core is provided with a lower valve shaft, which is guided and engaged with the valve shaft guide hole (37).

10. A high-frequency wear-resistant and impact-resistant check valve according to claim 4, characterized in that, The valve core is also provided with a spring groove, and a spring (38) is provided in the spring groove. The spring (38) is sleeved on the upper valve shaft.

11. A high-frequency wear-resistant and impact-resistant check valve according to claim 7, characterized in that, The valve seat sealing ring (43) is also provided with upper and lower guide angles (49) and medium guide lines (50) for guiding the entry of valve core sealing O-ring one and valve core sealing O-ring two and for guiding the flow direction of the medium.

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