A valve core assembly and a distribution valve having the same.

Abstract

This application discloses a valve core assembly and a distribution valve having the same, relating to the field of valve core assembly technology. The valve core assembly includes: a conical plate fixedly connected to the sealing end of a piston rod, the conical plate having at least a portion protruding from the outer circumferential surface of the piston rod with a tapered structure that is narrower at the top and wider at the bottom; a first pressure plate sleeved on the piston rod, the lower end of the first pressure plate having at least a portion of its structure cooperating with the tapered structure; and a valve cone fixedly connected to the first pressure plate. This application is applicable to high-pressure slurry conveying scenarios.

Description

Technical Field

[0001] This application relates to the field of valve core assembly technology, and more particularly to a valve core assembly and a distribution valve having the same. Background Technology

[0002] In industrial pump systems for high-pressure slurry transport, the valve core assembly is generally connected to the load-bearing components using screw fasteners. In this case, the screws mainly bear the load in the valve core assembly. Due to the long-term exposure to large impacts and vibrations in industrial pump systems, the screw fasteners are prone to fatigue fracture, loosening, or loss of preload due to factors such as stress fatigue. Summary of the Invention

[0003] In view of this, embodiments of this application provide a valve core assembly and a distribution valve having the same, to solve the problem of fastener failure caused by impact forces on screw fasteners.

[0004] In a first aspect, embodiments of this application provide a valve core assembly, comprising: a conical plate fixedly connected to the sealing end of a piston rod, wherein at least a portion of the conical plate protrudes from the outer circumferential surface of the piston rod and has a conical surface structure that is narrower at the top and wider at the bottom; a first pressure plate sleeved on the piston rod, wherein at least a portion of the lower end of the first pressure plate mates with the conical surface structure; and a valve cone fixedly connected to the first pressure plate.

[0005] Optionally, the piston rod has a recessed structure at the contact point with the cone plate, which is recessed into the outer circumferential surface of the piston rod and cooperates with the cone plate.

[0006] Optionally, the lower part of the recessed structure is provided with a horizontal or upward-sloping surface structure.

[0007] Optionally, the lower part of the piston rod where it contacts the cone plate is provided with a horizontal or upward-sloping surface structure.

[0008] Optionally, the lower end of the conical structure is provided with a horizontal or upward-sloping inclined structure.

[0009] Optionally, a flexible pad is also included, which is disposed between the cone plate and the first pressure plate.

[0010] Optionally, the cone plate and the first pressure plate are fixedly connected using screws.

[0011] Optionally, a second pressure plate is also included, which is sleeved on the piston rod and above the first pressure plate; the second pressure plate is fixedly connected to the first pressure plate.

[0012] In a second aspect, embodiments of this application provide a distribution valve, including: a valve seat and a valve core assembly; the valve cone of the valve core assembly is sealed and fitted with the valve seat; wherein the valve core assembly is the valve core assembly described in the first aspect.

[0013] Optionally, it also includes a valve body, wherein the piston rod of the valve core assembly has grooves on at least two symmetrical sides, and the guide hole of the valve body is provided with a protrusion structure that cooperates with the grooves.

[0014] This application provides a valve core assembly and a distribution valve having the same. The structure utilizes the conical surface structure with a narrow top and wide bottom on the conical plate and the structure at the lower end of the first pressure plate that cooperates with the conical surface structure to decompose the force, thus solving the problem of fastener failure caused by the impact force on the screw fastener. At the same time, when the valve core assembly is subjected to impact vibration, the conical surface structure of the first pressure plate and the conical plate can also achieve self-tightening of the structure, making the connection structure of the valve core assembly more reliable. Attached Figure Description

[0015] To more clearly illustrate the technical solutions in the embodiments of this application or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of this application. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0016] Figure 1a This is a front view schematic diagram of a valve core assembly structure according to an embodiment of this application; Figure 1b This is a side view of a valve core assembly structure according to an embodiment of this application; Figure 1c This is a bottom view of a valve core assembly structure according to an embodiment of this application; Figure 2 This is a schematic diagram of a prior art valve core assembly structure according to an embodiment of this application; Figure 3 This is a schematic diagram of the front section structure of a distribution valve according to an embodiment of this application; Figure 4a This is a front view schematic diagram of the distribution valve according to an embodiment of this application; Figure 4b for Figure 4a A side sectional view of the distribution valve shown. Figure 5 This is a schematic diagram of a prior art distribution valve structure according to an embodiment of this application; In the diagram: 1. Valve core assembly; 11. Cone plate; 12. Piston rod; 13. First pressure plate; 14. Valve cone; 15. Flexible pad; 16. Screw; 17. Second pressure plate; 18. Sealing ring; 2. Distribution valve; 21. Valve seat; 22. Discharge port; 23. Valve body. Detailed Implementation

[0017] The embodiments of this application will now be described in detail with reference to the accompanying drawings.

[0018] It should be understood that the described embodiments are merely some embodiments of this application, and not all embodiments. All other embodiments obtained by those skilled in the art based on the embodiments of this application without inventive effort are within the scope of protection of the embodiments of this application.

[0019] Example 1: Industrial pump systems are commonly used in mine backfilling. Due to the high consistency of the paste, high conveying resistance, long conveying distance, large conveying volume, and high pressure conveying required in mine backfilling, the valve core assembly in industrial pumps is subjected to long-term impact and vibration, which can lead to fatigue fracture, loosening, or loss of preload in the screw fasteners of the valve core assembly, resulting in fastener failure problems such as fastening failure.

[0020] See Figure 1a , Figure 1b and Figure 1c ,like Figure 1a , Figure 1b and Figure 1c As shown, this application embodiment provides a valve core assembly 1, including: a cone plate 11, fixedly connected to the sealing end of a piston rod 12, wherein at least a portion of the cone plate 11 protrudes from the outer circumferential surface of the piston rod 12 and has a tapered surface structure that is narrower at the top and wider at the bottom; a first pressure plate 13, sleeved on the piston rod 12, wherein at least a portion of the lower end of the first pressure plate 13 cooperates with the tapered surface structure; and a valve cone 14, fixedly connected to the first pressure plate 13.

[0021] In this embodiment, the conical plate 11 is fixedly connected to the sealing end of the piston rod 12 (the lower end of the piston rod 12 in Figure 1) to prevent it from falling off the piston rod 12 after being impacted; at least part of the structure on the conical plate 11 is a conical surface structure that is narrow at the top and wide at the bottom; the first pressure plate 13 is sleeved on the piston rod 12, and at least part of the structure at the lower end of the first pressure plate 13 cooperates with the conical surface structure on the conical plate 11; and the conical surface structure of the conical plate 11 protrudes and contacts the outer peripheral surface of the piston rod 12 to cooperate with the structure of the first pressure plate 13; the valve cone 14 structure is fixedly connected to the first pressure plate 13 structure to prevent the valve cone 14 from generating elastic impact force under the action of impact force, which would cause it to separate from the first pressure plate 13 structure.

[0022] See Figure 2 ,like Figure 2As shown, in the prior art valve core assembly, screws are installed at the end of the piston rod to fix the cone plate and the valve cone and pressure plate connected to the cone plate, and to withstand impact forces. When the prior art valve core assembly is impacted, the screw bears the main impact force. Under long-term impact vibration, the screw will suffer fatigue fatigue, resulting in fatigue fracture, loosening, or failure of preload, which are fastener failure problems. However, when the valve core assembly 1 provided in this application impacts the valve seat at high speed, the impact force of the valve cone 14 on the valve seat is transmitted to the conical surface structure of the cone plate 11 through the first pressure plate 13 and decomposed by the conical surface structure. This solves the problem of fastener failure caused by the screw fastener bearing the main force. At the same time, when the valve core assembly 1 is impacted, the valve cone 14 transmits the impact force to the first pressure plate 13 and the cone plate 11. Under the action of the impact force, the conical surface structure of the first pressure plate 13 and the cone plate 11 fits more tightly. The conical surface structure of the first pressure plate 13 and the cone plate 11 achieves self-tightening of the valve core assembly 1, making the connection structure of the valve core assembly 1 more reliable.

[0023] In some embodiments, the piston rod 12 has a recessed structure at the contact point with the cone plate 11 that is recessed into the outer peripheral surface of the piston rod 12 and cooperates with the cone plate 11.

[0024] In this embodiment, the piston rod 12 has a recessed structure at the fixed contact point with the cone plate 11, which is recessed into the outer circumferential surface of the piston rod 12. The recessed structure cooperates with the cone plate 11, so that the fixed connection between the piston rod 12 and the cone plate 11 relies less on the fastening friction between the cone plate 11 and the piston rod 12 to prevent the cone plate 11 from sliding off the lower end of the piston rod 12 when subjected to impact force. Instead, it relies on the structure on the piston rod 12 that cooperates with the cone plate 11 to block the cone plate 11.

[0025] In some embodiments, the lower part of the recessed structure is provided with a horizontal or upward-sloping surface structure.

[0026] In this embodiment, the horizontal or upward-sloping structure at the lower part of the recessed structure on the piston rod 12 is used to cooperate with the cone plate 11 to prevent the cone plate 11 from sliding down from the lower end of the piston rod 12 under the action of impact force.

[0027] In other embodiments, the lower part of the piston rod 12 at the contact point with the cone plate 11 is provided with a horizontal or upward inclined surface structure. The horizontal or upward inclined surface structure at the lower part of the piston rod 12 at the contact point with the cone plate 11 is used to cooperate with the cone plate 11 to prevent the cone plate 11 from sliding off the lower end of the piston rod 12 under the action of impact force. The horizontal or upward inclined surface structure at the lower part of the piston rod 12 is provided at the lower part of the recessed structure of the piston rod 12, or there is a protruding structure on the outer circumferential surface of the lower end of the piston rod 12 that is integral with the piston rod 12 or fixedly connected to the piston rod 12 through the recessed structure or other fixed structure. The horizontal or upward inclined surface structure at the lower part of the piston rod 12 is provided at the lower part of the protruding structure of the piston rod 12 to prevent the cone plate 11 from sliding off the lower end of the piston rod 12 under the action of impact force.

[0028] In some embodiments, the lower end of the conical structure is provided with a horizontal or upward-sloping inclined structure.

[0029] In this embodiment, the horizontal or upward-sloping structure at the lower end of the conical structure blocks the first pressure plate 13. Under the action of the impact force, the conical structure of the conical plate 11 decomposes the impact force and generates a first force that causes the first pressure plate 13 to expand outward along the surface normal direction of the piston rod 12, and a second force that is opposite to the decomposed force of the impact force along the axial direction of the piston rod 12. At the same time, the contact friction between the first pressure plate 13 and the conical structure of the conical plate 11 reduces the outward expansion effect of the first force on the first pressure plate 13, reduces the tensile fatigue effect of the impact force on the material of the first pressure plate 13, and improves the service life of the first pressure plate 13.

[0030] In some embodiments, the valve core assembly 1 further includes a flexible pad 15 disposed between the cone plate 11 and the first pressure plate 13.

[0031] In this embodiment, the flexible pad 15 disposed between the cone plate 11 and the first pressure plate 13 can provide shock absorption and isolation between the cone plate 11 and the first pressure plate 13, avoiding direct impact between the cone plate 11 and the first pressure plate 13 on the axial force of the piston rod 12, enhancing the vibration resistance of the valve core assembly 1, and improving the stability of the valve core assembly 1.

[0032] In some embodiments, the flexible pad 15 is a rubber pad.

[0033] In some embodiments, the cone plate 11 and the first pressure plate 13 are fixedly connected by screws 16.

[0034] In this embodiment, the fixing screw 16 between the cone plate 11 and the first pressure plate 13 connects and fixes the cone plate 11 and the first pressure plate 13. However, when the valve core assembly 1 impacts the valve seat at high speed, the valve cone 14, the first pressure plate 13, the cone plate 11 and the piston rod 12 mainly bear the impact force. The screw 16 mainly serves to connect and fix the cone plate 11 and the first pressure plate 13, rather than bear the impact force, and has a long service life.

[0035] In some embodiments, the valve core assembly 1 further includes a second pressure plate 17, which is sleeved on the piston rod 12 and above the first pressure plate 13; the second pressure plate 17 is fixedly connected to the first pressure plate 13.

[0036] In this embodiment, the second pressure plate 17 is sleeved on the piston rod 12 and is above the first pressure plate 13. The second pressure plate 17 and the first pressure plate 13 are provided with a structure that cooperates with the valve cone 14 so as to fix the valve cone 14 by means of the second pressure plate 17 and the first pressure plate 13. When the valve cone 14 impacts the valve seat, the impact force on the valve cone 14 is mainly transmitted to the first pressure plate 13 located below the valve cone 14. After the valve cone 14 is impacted by the valve seat, it works together with the first pressure plate 13 to make the valve cone 14 generate an elastic impact force that is transmitted to the second pressure plate 17 located above the valve cone 14.

[0037] In some embodiments, the first pressure plate 13 and the second pressure plate 17 are fixedly connected by screws 16, and anti-loosening washers are provided at the screw connection to improve the impact resistance of the screw 16 fixed connection. Because the impact force of the valve cone 14 on the valve seat is mainly transmitted to the first pressure plate 13 located below the valve cone 14, and the screws 16 mainly connect and fix the first pressure plate 13 and the second pressure plate 17, the screws 16 that fix the first pressure plate 13 and the second pressure plate 17 are subjected to less elastic impact force generated by the valve cone 14. Therefore, the screws 16 that fix the first pressure plate 13 and the second pressure plate 17 are less affected by high pressure impact fatigue and have a longer service life.

[0038] In some embodiments, the valve core assembly 1 further includes sealing rings 18. Sealing rings 18 are provided at the contact points between the first pressure plate 13 and the piston rod 12, between the first pressure plate 13 and the valve cone 14, and between the second pressure plate 17 and the piston rod 12, to seal any gaps that may exist at each contact point, so as to prevent fluid leakage from the contact point. At the same time, when the valve core assembly 1 is subjected to impact, the sealing rings at each contact point play a certain role in shock absorption and buffering, enhancing the vibration resistance of the valve core assembly 1 and improving the stability of the valve core assembly 1.

[0039] Example 2: Due to the high consistency, high transport resistance, long transport distance, large transport volume, and high pressure transport requirements of the filling paste in mine backfilling, industrial pumps with two-position four-way distribution valves are generally selected. However, the valve core assembly of the distribution valve is subjected to long-term impact and vibration, which can lead to fatigue of the fasteners, causing them to loosen or break. When the screw fasteners fail, the valve core assembly is prone to eccentricity, affecting the concentricity with the valve seat and preventing it from sealing the high-pressure slurry properly. The resulting jet can directly damage the valve core assembly and the valve seat and other mating structural components. The industry generally uses anti-loosening measures such as thread-locking adhesive, anti-loosening gaskets, and lock nuts, but these have problems such as inconvenient maintenance and short service life.

[0040] See Figure 3 , Figure 4a and Figure 4b ,like Figure 3 , Figure 4a and Figure 4b As shown, this application provides a distribution valve 2, including: a valve seat 21 and a valve core assembly; the valve cone of the valve core assembly is sealed and fitted with the valve seat 21; wherein, the valve core assembly is the valve core assembly 1 described in Embodiment 1.

[0041] In this embodiment, the valve core assembly 1 is reciprocated by a hydraulic cylinder. Figure 3 The valve core assembly 1 on the right side is in the closed state. The valve cone 14 of the valve core assembly 1 collides with the valve seat 21 to seal, and the high-pressure slurry does not flow out. Figure 3 The valve core assembly 1 on the left side is in the open state, the valve cone 14 of the valve core assembly 1 is separated from the valve seat 21, and the slurry flows out from the gap between the valve cone 14 and the valve seat 21. Figure 3 The two sets of valve core assemblies 1 move back and forth alternately through their respective power, continuously pumping the high-pressure slurry from the upper cavity to the lower cavity, and then conveying the slurry from the outlet 22 of the distribution valve 2 to the pipeline connected to the outlet 22 of the distribution valve 2.

[0042] Since the slurry is composed of particles of different sizes, to seal the slurry, it is necessary to ensure that the valve cone 14 and valve seat 21 are tightly fitted on the sealing mating surface. The valve core assembly 1 needs to impact the valve seat 21 at high speed. During this process, when screws are used as the load-bearing fasteners, if the screw fasteners fail, the valve core assembly 1 is prone to eccentricity, affecting its concentricity with the valve seat 21, making it unable to seal the high-pressure slurry well. The resulting jet will directly damage the valve core assembly 1, the valve seat 21 that mates with the valve core assembly 1, and other structural components within the distribution valve 2. In this application, the valve core assembly 1 and the valve seat 21 of the distribution valve 2 are sealed together to achieve the sealing of the high-pressure fluid. At the same time, the valve core assembly 1 described in Embodiment 1 can prevent the distribution valve 2 from being damaged by the jet due to fastener failure under long-term impact and vibration, thus improving the service life of the distribution valve 2. See Figure 5 ,like Figure 5 As shown, the existing distribution valve uses the existing valve core assembly, with the screw bearing the main impact force, which is prone to screw failure, thereby causing impact damage to other structures inside the distribution valve; while the distribution valve 2 provided in this application uses the valve core assembly 1 described in embodiment 1 as the force-bearing component, which can avoid the problem of screw 16 being prone to failure as the main force-bearing component, and avoid the problems of inconvenient maintenance and short lifespan of anti-loosening measures such as thread-locking adhesive, anti-loosening gaskets and lock nuts, thus saving labor inspection and maintenance costs.

[0043] In some embodiments, the valve body 23 is further included, wherein the piston rod 12 of the valve core assembly 1 has grooves on at least two symmetrical sides, and the guide hole of the valve body 23 is provided with a protrusion structure that cooperates with the groove.

[0044] In this embodiment, the distribution valve 2 also includes a valve body 23, wherein the piston rod 12 of the valve core assembly 1 has grooves on at least two symmetrical sides, and a protruding structure that cooperates with the grooves is provided in the guide hole of the valve body 23 to guide the valve core assembly 1, so as to avoid the valve core assembly 1 being misaligned, which would cause the valve cone 14 and the valve seat 21 to not be fully engaged, resulting in uneven sealing of the distribution valve 2.

[0045] In some embodiments, symmetrical protrusions may be machined on at least two sides of the piston rod 12 of the valve core assembly 1. Without affecting the structure and sealing function of the valve body 23, grooves that cooperate with the protrusions are provided on the valve body 23 to guide the valve core assembly 1 and prevent the valve core assembly 1 from being misaligned, which would cause the valve cone 14 and the valve seat 21 to not be fully engaged, resulting in uneven sealing of the distribution valve 2.

Claims

1. A valve core assembly, characterized in that, include: A conical plate is fixedly connected to the sealing end of the piston rod, and the conical plate has at least a portion of a conical surface structure that is narrow at the top and wide at the bottom that protrudes from the outer circumferential surface of the piston rod; A first pressure plate is sleeved on the piston rod, and at least a portion of the lower end of the first pressure plate mates with the conical structure. The valve cone is fixedly connected to the first pressure plate.

2. The valve core assembly according to claim 1, characterized in that, The piston rod has a recessed structure at the contact point with the cone plate, which is recessed into the outer circumferential surface of the piston rod and cooperates with the cone plate.

3. The valve core assembly according to claim 2, characterized in that, The lower part of the recessed structure is provided with a horizontal or upward-sloping surface structure.

4. The valve core assembly according to claim 1, characterized in that, The piston rod has a horizontal or upward-sloping surface structure at the lower part where it contacts the cone plate.

5. The valve core assembly according to claim 1, characterized in that, The lower end of the conical structure is provided with a horizontal or upward-sloping structure.

6. The valve core assembly according to claim 1, characterized in that, It also includes a flexible pad, which is disposed between the cone plate and the first pressure plate.

7. The valve core assembly according to claim 1, characterized in that, The cone plate and the first pressure plate are fixedly connected by screws.

8. The valve core assembly according to claim 1, characterized in that, It also includes a second pressure plate, which is sleeved on the piston rod and above the first pressure plate; the second pressure plate is fixedly connected to the first pressure plate.

9. A distribution valve, characterized in that, include: A valve seat and a valve core assembly; the valve cone of the valve core assembly is sealed and fitted with the valve seat; wherein the valve core assembly is the valve core assembly according to any one of claims 1 to 8.

10. The distribution valve according to claim 9, characterized in that, It also includes a valve body, wherein the piston rod of the valve core assembly has grooves on at least two symmetrical sides, and the guide hole of the valve body is provided with a protrusion structure that cooperates with the groove.

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