A coaxial valve with quick replacement of seal seat without disassembly of valve body

Abstract

The application relates to the technical field of coaxial valves, and discloses a coaxial valve capable of quickly replacing a sealing seat without disassembling a valve body, which comprises a coaxial valve body and a right end cover, and a sealing seat quick replacement mechanism is arranged in the right end cover; the sealing seat quick replacement mechanism comprises a sealing valve seat in a hollow convex letter type structure, which is installed in the right end cover; and a sealing assembly arranged at the top end of the sealing valve seat in the right end cover, wherein the sealing assembly comprises a sealing gasket; when the sealing valve seat needs to be replaced, the sealing valve seat can be directly disassembled as a whole without disassembling the right end cover, and the sealing gasket can be selectively and independently replaced, so that the sealing gasket and the sealing valve seat are separated for maintenance; and the sealing valve seat is connected with the valve body in a modular mode through a detachable structure. The sealing seat quick replacement mechanism is used to quickly replace the sealing assembly of the coaxial valve without disassembling the valve body, and the equipment maintenance efficiency is remarkably improved.

Description

Technical Field

[0001] This invention relates to the field of coaxial valves, and more specifically, to a coaxial valve with a quick-change sealing seat without disassembling the valve body. Background Technology

[0002] Coaxial valves are important devices in the field of industrial fluid control. Their core feature is that the inlet and outlet channels are arranged along the same axis, forming a unique flow channel geometry. This valve achieves medium flow control through the axial movement of the valve core and mainly consists of the following three parts: coaxial valve body, sealing assembly, and drive mechanism.

[0003] Existing coaxial valves generally employ an integral sealing structure, with the valve seat and body fixed by welding or a single molding process. This necessitates disassembling the valve body end cap or even the entire pipeline when replacing the sealing components. Furthermore, the screws on the inlet and outlet end caps must be removed separately to access the seals, resulting in maintenance sessions that can take several hours and are inconvenient to disassemble. Therefore, we propose a coaxial valve that allows for quick replacement of the sealing seat without disassembling the valve body. Summary of the Invention

[0004] This invention provides a coaxial valve with quick-replacement of the sealing seat without disassembling the valve body, solving the technical problem in related technologies that the valve body end cover or even the entire pipeline must be disassembled when replacing the sealing component, which takes up to several hours for a single maintenance and is inconvenient to disassemble.

[0005] This invention provides a coaxial valve with quick-change sealing seat without disassembling the valve body, comprising: a coaxial valve body and a right end cover, wherein the right end cover is provided with a quick-change sealing seat mechanism;

[0006] The quick-change sealing seat mechanism includes: a sealing valve seat with a hollow convex structure, which is installed inside the right end cover; and a sealing assembly disposed at the top of the sealing valve seat inside the right end cover, the sealing assembly including a sealing gasket;

[0007] When it is necessary to replace the sealing valve seat, the entire sealing valve seat can be removed without disassembling the right end cover, and the sealing gasket can be replaced independently, realizing separate maintenance of the sealing gasket and the sealing valve seat.

[0008] The sealing valve seat achieves modular connection with the valve body through a detachable structure, ensuring sealing performance while making the maintenance of the sealing component, which is a vulnerable part, completely independent of the valve body structure.

[0009] Furthermore, a gland is provided on the side of the sealing gasket away from the sealing valve seat, and a pressure screw is provided on the side of the gland away from the sealing gasket. The threaded shank of the pressure screw passes through the gland, the sealing gasket and the sealing valve seat in sequence, and is threadedly connected to the sealing valve seat.

[0010] Furthermore, the gland is radially positioned by the umbo structure and the inner hole of the sealing gasket, and the contact surfaces of the two are mutually mating conical surfaces. The gasket screw passes through the gland and is threadedly connected to the positioning surface of the front stop of the sealing valve seat, forming an axial compression sealing structure.

[0011] Furthermore, the right end cover is located at the right end of the coaxial valve body. Each of the four corners of the right end cover is fitted with a fixing bolt, which is threaded to the coaxial valve body to fix the right end cover and the coaxial valve body.

[0012] Furthermore, a piston component is provided inside the coaxial valve body. The piston component includes a piston rod, and the direction of medium flow is consistent with the axial direction of the piston rod. The right end of the piston rod is sealed with a conical surface between the cutting edge and the sealing gasket on the sealing valve seat. The axis of the sealing gasket coincides with the axis of the piston rod.

[0013] Furthermore, the outer wall of the sealing valve seat is fixedly provided with threaded wire, and the threaded wire and the outer wall of the sealing valve seat are integrally formed. A liquid passage is provided at the center of the sealing valve seat.

[0014] Furthermore, the inlet end of the liquid passage is provided with an inlet hole, and the cross-sectional structure of the inlet hole and the liquid passage is a Y-shaped structure. The medium flows from the inlet hole to the liquid passage and then flows out from the liquid passage.

[0015] Furthermore, a sealing ring is provided on the side of the sealing valve seat that contacts the right end face of the right end cover. The sealing ring has a hollow internal structure and is used to seal the contact surface between the sealing valve seat and the right end cover when the valve seat is screwed into the right end cover. Several mounting balls are fixedly provided on the side wall of the sealing ring. The mounting balls are rubber balls. The mounting balls have a mass inlet hole only at the position of the central axis perpendicular to the sealing ring and are connected to the sealing ring.

[0016] Furthermore, the sealing valve seat has several preset grooves on the side near the sealing ring, and each preset groove corresponds to a certain number of mounting balls. The diameter of the mounting balls is larger than the diameter of the preset grooves. A flow channel is provided on one side of the preset grooves, and an inlet is provided at the central axis of the pressure pad screw. The outlet end of the inlet is provided with a conical reflux chamber, which is located at the bottom of the pressure pad screw hole.

[0017] Furthermore, a flow-blocking ball is installed inside the reflux chamber, and a main flow channel is provided in the direction of medium flow in the reflux chamber. The main flow channel and the branch flow channels are interconnected. A push ball spring is fixedly installed on the side of the flow-blocking ball near the main flow channel, and the other end of the push ball spring is fixedly connected to the main flow channel. The diameter of the flow-blocking ball is larger than the diameter of the liquid inlet end of the reflux chamber.

[0018] The beneficial effects of this invention are as follows:

[0019] This invention enables quick replacement of the coaxial valve sealing assembly without disassembly through a quick-change sealing seat mechanism, which significantly improves equipment maintenance efficiency. The sealing valve seat adopts a threaded connection structure and is directly fixed inside the right end cover. During maintenance, it is only necessary to identify the direction of the thread to unscrew it as a whole, without disassembling the valve body or the right end cover, thus avoiding the risk of damage to the sealing surface caused by repeated disassembly and assembly in traditional valve maintenance.

[0020] The gland and gasket are radially positioned by a convex umbilicus structure and sealed with a conical end face, which ensures the concentricity of the sealing components and forms a reliable static seal through the axial compression structure. The design that the gasket and gland can be replaced independently further reduces maintenance costs. Users can selectively replace vulnerable parts according to wear conditions, extending the service life of the sealing valve seat. Attached Figure Description

[0021] Figure 1 This is a schematic diagram of the overall structure of the present invention;

[0022] Figure 2 This is a schematic diagram of the internal structure of a coaxial valve body according to an embodiment of the present invention;

[0023] Figure 3 This is a schematic diagram of the internal structure of the coaxial valve body according to Embodiment 2 of the present invention;

[0024] Figure 4 This is a schematic diagram of the coaxial valve body structure from the right side of the present invention;

[0025] Figure 5 This is a schematic diagram of the separation structure of the sealing valve seat and the right end cap of the present invention;

[0026] Figure 6 This is a schematic diagram of the internal structure of the sealing valve seat of the present invention;

[0027] Figure 7 This is a schematic diagram of the internal structure of the pressure pad screw of the present invention;

[0028] Figure 8 This is the invention Figure 7 Enlarged view of point A in the middle;

[0029] Figure 9 This is the invention Figure 7 Enlarged diagram of point B in the middle.

[0030] In the diagram: 11. Coaxial valve body; 12. Right end cover; 13. Piston; 14. Fixed cover bolt; 2. Quick-change sealing seat mechanism; 21. Sealing valve seat; 22. Fluid passage; 23. Threaded thread; 24. Inlet hole; 25. Pressure washer screw; 26. Pressure cover; 27. Sealing gasket; 31. Sealing ring; 32. Main flow channel; 33. Branch flow channel; 34. Inlet; 35. Backflow chamber; 36. Flow-blocking ball; 37. Push ball spring; 38. Preset groove; 39. Mounting ball. Detailed Implementation

[0031] The subject matter described herein will now be discussed with reference to exemplary embodiments. It should be understood that these embodiments are discussed only to enable those skilled in the art to better understand and implement the subject matter described herein, and changes may be made to the function and arrangement of the elements discussed without departing from the scope of this specification. Various processes or components may be omitted, substituted, or added as needed in the examples. Furthermore, features described in some examples may be combined in other examples.

[0032] Example 1: As Figures 1-2 As shown, a coaxial valve with quick-change sealing seat without disassembly includes: a coaxial valve body 11 and a right end cover 12, wherein a quick-change sealing seat mechanism 2 is provided inside the right end cover 12.

[0033] The quick-change sealing seat mechanism 2 includes: a sealing valve seat 21 with a hollow convex structure, which is installed inside the right end cover 12; and a sealing assembly disposed at the top of the sealing valve seat 21 inside the right end cover 12, the sealing assembly including a sealing gasket 27.

[0034] When it is necessary to replace the sealing valve seat 21, the entire sealing valve seat 21 can be removed without disassembling the right end cover 12, and the sealing gasket 27 can be replaced independently, so as to achieve separate maintenance of the sealing gasket 27 and the sealing valve seat 21.

[0035] The sealing valve seat 21 achieves modular connection with the valve body through a detachable structure, ensuring sealing performance while making the maintenance of the sealing component, which is a vulnerable part, completely independent of the valve body structure.

[0036] When the quick-change mechanism 2 of the sealing seat needs to be replaced, the operator only needs to remove the sealing valve seat 21 from the right end cover 12 and visually inspect the condition of the sealing valve seat 21 and the sealing gasket 27 to see if they are damaged. The operator can choose to replace the sealing gasket 27 alone or replace both the sealing valve seat 21 and the sealing gasket 27 together, depending on the actual situation.

[0037] Example 2: Figures 1-9 As shown, a pressure cap 26 is provided on the side of the sealing gasket 27 away from the sealing valve seat 21, and a pressure screw 25 is provided on the side of the pressure cap 26 away from the sealing gasket 27. The threaded rod of the pressure screw 25 passes through the pressure cap 26, the sealing gasket 27 and the sealing valve seat 21 in sequence, and is threadedly connected to the sealing valve seat 21.

[0038] The gland 26 forms a radial position with the inner hole of the sealing gasket 27 through the umbo structure, and the contact end faces of the two are mutually mating conical surfaces. The pressure gasket screw 25 passes through the gland 26 and is threadedly connected to the front stop positioning surface of the sealing valve seat 21 to form an axial compression sealing structure.

[0039] The right end cover 12 is located at the right end of the coaxial valve body 11. Each of the four corners of the right end cover 12 is provided with a fixing bolt 14, which is threadedly connected to the coaxial valve body 11 to fix the right end cover 12 and the coaxial valve body 11.

[0040] The threaded connection structure enables the sealing valve seat 21 to be replaced without disassembly, avoiding damage to the main structure of the valve body and significantly shortening maintenance time. The radially positioned convex navel structure and conical surface cooperate to ensure the concentricity of the gland 26 and the sealing gasket 27, improving sealing reliability.

[0041] The coaxial valve body 11 is provided with a piston component 13, which includes a piston rod. The direction of medium flow is consistent with the axial direction of the piston rod. The right end of the piston rod is sealed with a conical surface between the cutting edge and the sealing gasket 27 on the sealing valve seat 21. The axis of the sealing gasket 27 coincides with the axis of the piston rod.

[0042] The conical sealing design of the piston rod cutting edge and the sealing gasket 27 forms a self-reinforcing sealing effect under the action of medium pressure, reducing the risk of leakage. The axial pressing structure directly transmits pressure through the pressure pad screw 25, avoiding seal failure caused by bolt loosening.

[0043] The outer wall of the sealing valve seat 21 is fixedly provided with a thread 23, and the thread 23 and the outer wall of the sealing valve seat 21 are integrally formed. A liquid passage 22 is provided at the center of the sealing valve seat 21.

[0044] The liquid inlet end of the liquid passage 22 is provided with a liquid inlet hole 24, and the cross-sectional structure of the liquid inlet hole 24 and the liquid passage 22 is a Y-shaped structure. The medium flows from the liquid inlet hole 24 to the liquid passage 22 and then flows out from the liquid passage 22.

[0045] The outer wall thread 23 of the sealing valve seat 21 is integrally formed with the valve body, eliminating the thread fit clearance and improving the vibration resistance. The Y-shaped liquid inlet hole 24 and the liquid passage 22 optimize the medium flow direction, reduce flow resistance and reduce the erosion of the sealing surface by eddies.

[0046] A sealing ring 31 is provided on the side of the sealing valve seat 21 that contacts the right end face of the right end cover 12. The sealing ring 31 has a hollow structure inside and is used to seal the contact surface between the valve seat 21 and the right end cover 12 when the valve seat 21 is screwed into the right end cover 12.

[0047] A number of mounting balls 39 are fixedly provided on the side wall of the sealing ring 31. The mounting balls 39 are rubber balls. The mounting balls 39 have inlet holes only at the central axis position perpendicular to the sealing ring 31, and are connected to the sealing ring 31.

[0048] The sealing valve seat 21 has several preset grooves 38 on the side near the sealing ring 31. Each preset groove 38 corresponds to a number of mounting balls 39. The diameter of the mounting balls 39 is larger than the diameter of the preset grooves 38. A flow channel 33 is provided on one side of the preset grooves 38.

[0049] The hollow structure of the sealing ring 31, combined with the interference fit between the mounting ball 39 and the preset groove 38, expands to fill the gap under the action of medium pressure, realizing dynamic sealing compensation. The diversion channel 33 introduces the medium into the sealing ring 31, automatically adapts to the loosening of the sealing valve seat 21, and maintains long-term sealing performance.

[0050] A liquid inlet 34 is provided at the central axis position of the pressure pad screw 25, and a conical reflux chamber 35 is provided at the liquid outlet end of the liquid inlet 34. The reflux chamber 35 is located at the bottom of the screw hole of the pressure pad screw 25.

[0051] The reflux chamber 35 is equipped with a flow-blocking ball 36, and the reflux chamber 35 has a main flow channel 32 in the direction of medium flow. The main flow channel 32 is connected to the branch flow channel 33. A push ball spring 37 is fixedly installed on the side of the flow-blocking ball 36 near the main flow channel 32, and the other end of the push ball spring 37 is fixedly connected to the main flow channel 32. The diameter of the flow-blocking ball 36 is larger than the diameter of the liquid inlet end of the reflux chamber 35.

[0052] The conical backflow chamber 35 and the flow-blocking ball 36 form a one-way valve function to prevent the backflow of the medium from impacting the sealing surface; the push ball spring 37 blocks the backflow chamber 35 under normal operating conditions, and only balances the expansion force of the sealing ring 31 and the system pressure when the pressure fluctuates in the section of the main flow channel 32 and the branch flow channel 33.

[0053] When the sealing valve seat 21 is not loose, the pressure in the section of the main flow channel 32 and the branch flow channel 33 always pushes against the flow-blocking ball 36 to block it, and part of the flowing medium can only flow in the section of the inlet 34. Only when the sealing valve seat 21 is loose, the pressure in the section of the main flow channel 32 and the branch flow channel 33 changes and decreases, so that the medium in the inlet 34 will push the flow-blocking ball 36, open the passage, and thus allow the medium to enter the sealing ring 31.

[0054] When maintenance is required on the coaxial valve body 11, first, rotate the sealing valve seat 21 to pull it out of the right end cover 12, and then the operator uses a plate to unscrew the pressure pad screw 25 and replace the sealing gasket 27.

[0055] First, assemble the new sealing gasket 27 with the gland 26. Then, insert the pressure gasket screw 25 into the center of the sealing gasket 27 and the gland 26, and screw the pressure gasket screw 25 into the screw hole of the sealing valve seat 21 to press the sealing gasket 27.

[0056] Then screw the assembled sealing valve seat 21 into the right end cover 12 to complete the maintenance of the sealing valve seat 21.

[0057] Before assembling the sealing valve seat 21, put the sealing ring 31 on the sealing valve seat 21 and insert the mounting ball 39 into the preset groove 38. You can use a rubber hammer to hammer the mounting ball 39 into the preset groove 38 with a smaller diameter. At this time, the mounting ball 39 and the preset groove 38 fit tightly together and play a sealing role.

[0058] When the mounting ball 39 is inserted into the preset groove 38, the central axis of the mounting ball 39 is aligned with the liquid outlet port of the diversion channel 33.

[0059] The piston 13 moves left and right under control to open or close the valve body. Regardless of whether the coaxial valve body 11 is open or closed, part of the flowing medium will flow into the inlet 34. Under the high pressure impact of the medium, it impacts the flow-blocking ball 36, causing the flow-blocking ball 36 to squeeze the push ball spring 37. The medium is then diverted through the main flow channel 32 into multiple flow channels 33.

[0060] The medium flows into the sealing ring 31 through the diversion channel 33, causing the sealing ring 31 to expand, thereby increasing the sealing force;

[0061] If the sealing seat 21 of the coaxial valve body 11 becomes loose during operation, the sealing ring 31 expands under the pressure of the medium, thereby ensuring the sealing performance.

[0062] Under normal conditions, the pusher spring 37 will push the flow-blocking ball 36 to block the backflow chamber 35 and prevent backflow.

[0063] Work steps:

[0064] Disassembling the old sealing assembly:

[0065] Identify the thread direction of the sealing valve seat 21 and use a tool to unscrew it without removing the right end cap 12; remove the pressure pad screw 25 and take out the pressure cap 26 and sealing gasket 27 in sequence.

[0066] Install the new sealing gasket 27 and gland 26:

[0067] The new sealing gasket 27 and the gland 26 are radially positioned by the umbo structure to ensure that the conical contact end faces are fully fitted; the pressure gasket screw 25 passes through the gland 26 and is screwed into the front stop positioning surface of the sealing valve seat 21 to complete the axial compression.

[0068] Assemble the sealing valve seat 21 and the sealing ring 31:

[0069] Fit the sealing ring 31 onto the sealing valve seat 21, and use a rubber hammer to hammer the installation ball 39 into the preset groove 38 to fix the sealing ring 31 using an interference fit; check the connectivity between the branch channel 33 and the main channel 32.

[0070] Reinstall sealing valve seat 21 to valve body:

[0071] Screw the assembled sealing valve seat 21 into the right end cover 12, and form a rigid connection with the valve body through the thread 23; confirm that the sealing ring 31 is in contact with the end face of the right end cover 12 without any deviation.

[0072] The embodiments of the present invention have been described above. However, the present invention is not limited to the specific embodiments described above. The specific embodiments described above are merely illustrative and not restrictive. Those skilled in the art can make many other forms based on the guidance of the present embodiments, all of which are within the protection scope of the present embodiments.

Claims

1. A quick-change valve with a seal seat replacement without disassembly of the valve body, characterized in that, include: The valve body (11) and the right end cover (12) are coaxial, and the right end cover (12) is provided with a quick-change mechanism (2) for the sealing seat. The quick-change mechanism (2) for the sealing seat includes: a sealing valve seat (21) with a hollow convex structure, which is installed inside the right end cover (12); and a sealing assembly disposed at the top of the sealing valve seat (21) inside the right end cover (12), the sealing assembly including a sealing gasket (27). A pressure cap (26) is provided on the side of the sealing gasket (27) away from the sealing valve seat (21). A pressure pad screw (25) is provided on the side of the pressure cap (26) away from the sealing gasket (27). The threaded rod of the pressure pad screw (25) passes through the pressure cap (26), the sealing gasket (27) and the sealing valve seat (21) in sequence, and is threadedly connected to the sealing valve seat (21). The outer wall of the sealing valve seat (21) is fixedly provided with a threaded wire (23), and the threaded wire (23) and the outer wall of the sealing valve seat (21) are integrally formed. The sealing valve seat (21) is provided with a liquid passage (22) at the center position. The liquid inlet end of the liquid passage (22) is provided with a liquid inlet hole (24), and the cross-sectional structure of the liquid inlet hole (24) and the liquid passage (22) is a Y-shaped structure. The medium flows from the liquid inlet hole (24) to the liquid passage (22) and then flows out from the liquid passage (22). A sealing ring (31) is provided on the side of the sealing valve seat (21) that contacts the right end face of the right end cover (12). The sealing ring (31) has a hollow structure inside, which is used to seal the contact surface between the sealing valve seat (21) and the right end cover (12). Several mounting balls (39) are fixedly provided on the side wall of the sealing ring (31). The mounting balls (39) are rubber balls. The mounting balls (39) have a mass inlet hole only at the position of the central axis perpendicular to the sealing ring (31), and are connected to the sealing ring (31). The sealing valve seat (21) has several preset grooves (38) on the side near the sealing ring (31). Each preset groove (38) corresponds to a number of mounting balls (39). The diameter of the mounting balls (39) is larger than the diameter of the preset grooves (38). A flow channel (33) is provided on one side of the preset grooves (38). An inlet (34) is provided at the central axis of the pressure pad screw (25). A conical reflux chamber (35) is provided at the outlet end of the inlet (34). The reflux chamber (35) is located at the bottom of the screw hole of the pressure pad screw (25). The reflux chamber (35) is equipped with a flow-blocking ball (36) inside, and a main flow channel (32) is provided in the medium flow direction of the reflux chamber (35). The main flow channel (32) is connected to the branch channel (33). A push ball spring (37) is fixedly provided on the side of the flow-blocking ball (36) near the main flow channel (32), and the other end of the push ball spring (37) is fixedly connected to the main flow channel (32). The diameter of the flow-blocking ball (36) is larger than the diameter of the liquid inlet end of the reflux chamber (35). When it is necessary to replace the sealing valve seat (21), the sealing valve seat (21) can be removed directly without disassembling the right end cover (12), and the sealing gasket (27) can be replaced independently, so as to achieve separate maintenance of the sealing gasket (27) and the sealing valve seat (21). The sealing valve seat (21) is modularly connected to the valve body through a detachable structure, which ensures sealing performance while making the maintenance operation of the sealing component, which is a vulnerable part, completely independent of the valve body structure.

2. A quick-change seal seat coaxial valve according to claim 1, characterized in that, The pressure cap (26) forms a radial position with the inner hole of the sealing gasket (27) through the umbo structure, and the contact end faces of the two are mutually matching conical surfaces. The pressure gasket screw (25) passes through the pressure cap (26) and is threadedly connected to the front stop positioning surface of the sealing valve seat (21) to form an axial compression sealing structure.

3. A quick-change seal seat coaxial valve according to claim 2, characterized in that, The right end cap (12) is located at the right end of the coaxial valve body (11). The four corners of the right end cap (12) are all connected by a fixing bolt (14) and are threaded to the coaxial valve body (11) to fix the right end cap (12) and the coaxial valve body (11).

4. A quick-change seal seat coaxial valve according to claim 3, characterized in that, The coaxial valve body (11) is provided with a piston component (13). The piston component (13) includes a piston rod, and the direction of medium flow is consistent with the axial direction of the piston rod. The right end of the piston rod is sealed with a conical surface between the cutting edge and the sealing gasket (27) on the sealing valve seat (21). The axis of the sealing gasket (27) coincides with the axis of the piston rod.

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