Wear resistant valve seat

Abstract

A kind of wear-resistant valve seat, including the second valve seat body made of ceramic and the second valve seat fixed seat made of metal, the thermal expansion coefficient of second valve seat fixed seat is greater than the thermal expansion coefficient of second valve seat body;Second valve seat fixed seat is fixedly connected at the outlet of valve housing, the second valve seat fixed seat center is equipped with taper hole, the hole diameter of taper hole gradually reduces along the fluid outflow direction;The outer periphery of second valve seat body is the tapered contact surface that is adapted with the inner wall of taper hole.This wear-resistant valve seat is combined with the ceramic valve seat body by tapered contact surface, effectively reduces the wear under high temperature and high pressure and the environment of solid particle-containing fluid, improves wear resistance and stability;Significantly improve the performance, reliability and service life of valve device, reduce operating cost, improve the operation rate and productivity of plant equipment.

Description

Technical Field

[0001] This utility model relates to the field of valve component technology, specifically to a wear-resistant valve seat. Background Technology

[0002] In factory equipment and industrial applications, valve devices, as key components for controlling fluid flow, are widely used in various media conveying systems. In some applications, valve devices not only need to withstand high-temperature and high-pressure working environments, but also must possess high wear resistance to cope with wear problems caused by the collision of solid particles in multiphase flow and possible cavitation phenomena.

[0003] In traditional valve devices, the valve seat is a key part that directly contacts the valve core and controls the flow rate. Its wear resistance directly affects the service life and performance of the entire valve device. To improve the wear resistance of the valve seat, using high-hardness and high-wear-resistant ceramic materials has become an effective solution. However, due to their high hardness and brittleness, ceramic materials are difficult to process in complex ways, such as threading and drilling, which poses a challenge to the fixing and installation of ceramic valve seats.

[0004] In existing technologies, ceramic valve seats are usually installed and fixed by a metal valve seat holder. Due to the significant difference in the coefficients of thermal expansion between metal and ceramic, when the valve device is in a high-temperature working environment, a gap will be generated between the metal valve seat holder and the ceramic valve seat due to the different degrees of thermal expansion. This gap will not only cause valve seat vibration and aggravate wear, but may also affect the sealing performance of the valve device, thereby reducing the overall reliability and service life of the equipment.

[0005] like Figure 1 As shown, a conventional valve device includes a valve housing 100, a valve core 200, a first valve seat body 300, and a first valve seat fixing seat 400. An inlet 110 and an outlet 120 are provided on the valve housing 100. The first valve seat body 300 and the first valve seat fixing seat 400 are installed at the outlet 120. A movable valve core 200 is positioned above the first valve seat body 300 (since this structure is irrelevant to the core improvement of this patent, the moving structure of the valve core 200 will not be described in detail; those skilled in the art only need to know that it can adjust the valve flow rate by increasing or decreasing the gap between itself and the first valve seat body 300 within the valve housing 100). The first valve seat body 300 is typically designed as a cylinder, with a certain assembly tolerance between its outer circumference and the inner circumference of the first valve seat fixing seat 400 to ensure assembly feasibility. However, this design can lead to increased gap due to differences in thermal expansion coefficients at high temperatures, resulting in increased vibration of the first valve seat body 300 and accelerated wear of the ceramic first valve seat body 300.

[0006] In addition, the metal first valve seat fixing seat 400 may corrode after long-term contact with corrosive fluids, which may further affect its fixing effect and the overall performance of the valve device.

[0007] To address the aforementioned issues, it is necessary to design a novel wear-resistant valve seat structure. This structure can effectively reduce the gap and vibration between the ceramic valve seat and the metal valve seat fixing seat, improve the wear resistance and sealing performance of the valve seat, thereby extending the service life of the valve device and improving the operating efficiency and reliability of industrial equipment. Based on this, this invention proposes a wear-resistant valve seat. By optimizing the fit structure and material selection between the valve seat body and the valve seat fixing seat, the goal of reducing wear and improving sealing performance is achieved, providing a more reliable solution for fluid control in industrial applications. Summary of the Invention

[0008] To address the aforementioned issues, this invention provides a wear-resistant valve seat. This wear-resistant valve seat, through the combination of a tapered contact surface and a ceramic valve seat body, effectively reduces wear in high-temperature, high-pressure, and fluid environments containing solid particles, thereby improving wear resistance and stability. It significantly enhances the performance, reliability, and service life of the valve device, reduces operating costs, and increases the operating rate and productivity of factory equipment.

[0009] The technical solution of this utility model is as follows: A wear-resistant valve seat includes a second valve seat body made of ceramic and a second valve seat fixing seat made of metal. The coefficient of thermal expansion of the second valve seat fixing seat is greater than that of the second valve seat body. The second valve seat fixing seat is fixedly connected to the outlet of the valve body. The second valve seat fixing seat has a conical hole at its center, and the diameter of the conical hole gradually decreases along the fluid outflow direction. The outer periphery of the second valve seat body forms a conical contact surface that matches the inner wall of the conical hole.

[0010] The second valve seat body is made of any one of the following ceramics: boron nitride, silicon nitride, ferrite, or alumina.

[0011] The second valve seat mounting base is made of stainless steel.

[0012] The taper of the contact surface and the conical hole shall be no less than 1 / 200 and no more than 1 / 50.

[0013] A non-contact surface is provided in the middle of the contact surface.

[0014] The non-contact surface has an annular groove structure.

[0015] The second valve seat fixing seat is composed of a pressing section, a threaded section and a cylindrical section in sequence along the fluid flow direction. The cylindrical section is clearance-fitted with the outlet, and an internal thread that mates with the threaded section is provided on the inner side of the outlet. The pressing section is airtightly pressed against the inner end face of the outlet.

[0016] A sealing ring is installed between the pressure section and the inner end face of the outlet.

[0017] A through hole is provided in the middle of the second valve seat body.

[0018] A valve includes a wear-resistant valve seat and a valve body, the wear-resistant valve seat being mounted at the outlet of the valve body.

[0019] The beneficial effects of this utility model are as follows: 1. This utility model discloses a wear-resistant valve seat. The wear-resistant valve seat adopts a conical contact surface design, which makes the second valve seat body (made of ceramic) and the second valve seat fixed seat (made of metal) in close contact, avoiding the vibration and wear problems caused by the gap between the traditional cylindrical valve seat and the fixed seat. The conical design ensures that the valve seat can remain stable under high flow rate and high temperature conditions, reducing wear caused by vibration and extending the service life of the valve seat.

[0020] 2. The present invention discloses a wear-resistant valve seat in which the second valve seat body is made of a highly wear-resistant ceramic material (such as boron nitride, silicon nitride, ferrite or alumina). These materials have excellent wear resistance and can maintain a long service life in high temperature, high pressure and fluid environments containing solid particles. At the same time, the design of the conical contact surface further improves the stability of the valve seat and reduces the performance degradation caused by different coefficients of thermal expansion.

[0021] 3. The present invention discloses a wear-resistant valve seat in which the second valve seat fixing seat is made of a metal material (such as stainless steel) with a thermal expansion coefficient greater than that of the second valve seat body. Through the conical design, even under high temperature conditions, the gap between the valve seat and the fixing seat will not increase significantly due to the difference in thermal expansion coefficient, thereby avoiding performance degradation and increased wear caused by thermal expansion.

[0022] 4. The present invention discloses a wear-resistant valve seat, which ensures the precise positioning and stable fixation of the valve seat in the fixed seat by limiting the taper of the contact surface and the conical hole to between 1 / 200 and 1 / 50; this taper range can prevent the gap on the side with the larger taper diameter from becoming too large when the temperature rises, and also facilitates the installation and disassembly of the valve seat.

[0023] 5. The present invention discloses a wear-resistant valve seat, wherein a non-contact surface (such as an annular groove structure) is provided in the middle of the contact surface, which reduces the contact area between the valve seat and the fixed seat, making it easier to remove the valve seat from the fixed seat when replacement is required, thereby reducing maintenance costs and time. Attached Figure Description

[0024] The advantages and solutions of this application will become clear to those skilled in the art upon reading the following detailed description of preferred embodiments. The accompanying drawings are for illustrative purposes only and are not intended to limit the scope of this invention.

[0025] In the attached diagram: Figure 1 This is a schematic diagram of the structure of a wear-resistant valve seat in the prior art; Figure 2 This is a schematic diagram of the structure of a wear-resistant valve seat according to Embodiment 1 of this utility model; Figure 3 This is a schematic diagram of the structure of the second valve seat body of a wear-resistant valve seat according to Embodiment 1 of this utility model; Figure 4 This is a schematic diagram of the structure of the second valve seat fixing seat of a wear-resistant valve seat according to Embodiment 1 of this utility model; Figure 5 This is a schematic diagram of the structure of the second valve seat body of a wear-resistant valve seat according to Embodiment 2 of this utility model; The components represented by the various reference numerals in the diagram are: This utility model includes: 100, valve body; 110, inlet; 120, outlet; 200, valve core; 300, first valve seat body; 400, first valve seat fixing seat; 500, sealing ring; 600, second valve seat body; 610, contact surface; 620, through hole; 630, non-contact surface; 700, second valve seat fixing seat; 710, cylindrical section; 720, threaded section; 730, pressing edge section; 740, tapered hole. Detailed Implementation

[0026] Example 1 like Figure 2 As shown, the wear-resistant valve seat includes a second valve seat body 600 made of ceramic and a second valve seat fixing seat 700 made of metal; the coefficient of thermal expansion of the second valve seat fixing seat 700 is greater than that of the second valve seat body 600 to ensure stable fit between the two in high-temperature environments; as Figure 4 As shown, the second valve seat fixing base 700 is fixedly connected to the outlet 120 of the valve body 100, and has a conical hole 740 at its center. The diameter of the conical hole 740 gradually decreases along the fluid flow direction; as shown... Figure 3 As shown, the outer periphery of the second valve seat body 600 forms a tapered contact surface 610 that matches the inner wall of the tapered bore 740 to ensure a tight fit and reduce wear.

[0027] The second valve seat body 600 is made of alumina ceramic, which effectively resists the erosion of solid particles in the fluid by utilizing its high hardness and wear resistance.

[0028] The second valve seat fixing seat 700 is made of stainless steel (such as SUS316L), which has good corrosion resistance and processing performance. At the same time, its coefficient of thermal expansion is greater than that of alumina ceramic, so as to adapt to the thermal stress changes in high temperature environment.

[0029] The taper of the contact surface 610 and the conical hole 740 is designed to be no less than 1 / 200 and no more than 1 / 50. This range ensures the precise positioning of the valve seat body 600 within the fixed seat 700 while preventing excessive clearance due to thermal expansion differences. Please refer to [the relevant documentation / reference] for the taper calculation method. Figure 3 , which is (D1-D2) / L1.

[0030] In practice, the taper can be set to 1 / 100 to balance positioning accuracy and thermal stability.

[0031] The second valve seat fixing base 700 is composed of a pressing section 730, a threaded section 720 and a cylindrical section 710 in sequence along the fluid flow direction; the cylindrical section 710 is clearance-fitted with the outlet 120 for easy installation; the inner side of the outlet 120 is provided with an internal thread that mates with the threaded section 720 to achieve a fixed connection; the pressing section 730 is airtightly pressed against the inner end face of the outlet 120 to ensure sealing.

[0032] A sealing ring 500, such as a Teflon or fluororubber O-ring, is installed between the inner end face of the pressing section 730 and the outlet 120 to prevent fluid leakage.

[0033] The second valve seat body 600 has a through hole 620 in the middle, which serves as a channel for fluid to pass through. Its diameter is designed according to the actual flow requirements.

[0034] The valve assembly includes the aforementioned wear-resistant valve seat and valve body 100; the wear-resistant valve seat is installed at the outlet 120 of the valve body 100 and is fixed and sealed by threaded connection and pressure seal.

[0035] The valve body 100 is made of stainless steel or other corrosion-resistant metal materials, and has a fluid passage and an outlet 120 structure that mates with the wear-resistant valve seat. The inner end face of the outlet 120 is designed with an internal thread that mates with the threaded section 720 of the wear-resistant valve seat fixing seat 700, as well as a sealing groove for installing the sealing ring 500.

[0036] Example 2 like Figure 5 As shown, a non-contact surface 630 with an annular groove structure is provided in the middle of the contact surface 610. This design reduces the contact area between the valve seat body 600 and the fixed seat 700, making it easier to disassemble and replace the valve seat body 600, while maintaining the overall stability of the valve seat.

[0037] During assembly, first install the sealing ring 500 in the sealing groove between the pressing section 730 and the inner end face of the outlet 120; then insert the cylindrical section 710 of the wear-resistant valve seat fixing seat 700 into the outlet 120 of the valve body 100, and rotate the fixing seat 700 so that the threaded section 720 engages with the internal thread on the inner side of the outlet 120; finally, align the tapered contact surface 610 of the second valve seat body 600 with the tapered hole 740 of the fixing seat 700 and insert it to ensure a tight fit.

[0038] This valve device is suitable for high temperature, high pressure and fluid environments containing solid particles, such as slurry conveying systems in the chemical and metallurgical industries.

Claims

1. A wear-resistant valve seat, characterized in that, The valve includes a ceramic second valve seat body (600) and a metal second valve seat fixing seat (700). The coefficient of thermal expansion of the second valve seat fixing seat (700) is greater than that of the second valve seat body (600). The second valve seat fixing seat (700) is fixedly connected to the outlet (120) of the valve body (100). The center of the second valve seat fixing seat (700) is provided with a conical hole (740). The diameter of the conical hole (740) gradually decreases along the fluid outflow direction. The outer periphery of the second valve seat body (600) forms a conical contact surface (610) that matches the inner wall of the conical hole (740).

2. The wear-resistant valve seat according to claim 1, characterized in that, The second valve seat body (600) is made of any one of boron nitride, silicon nitride, ferrite or alumina ceramic.

3. The wear-resistant valve seat according to claim 1, characterized in that, The second valve seat fixing seat (700) is made of stainless steel.

4. The wear-resistant valve seat according to claim 1, characterized in that, The taper of the contact surface (610) and the tapered hole (740) is not less than 1 / 200 and not greater than 1 / 50.

5. A wear-resistant valve seat according to claim 1, characterized in that, A non-contact surface (630) is provided in the middle of the contact surface (610).

6. A wear-resistant valve seat according to claim 5, characterized in that, The non-contact surface (630) has an annular groove structure.

7. A wear-resistant valve seat according to claim 1, characterized in that, The second valve seat fixing seat (700) is composed of a pressing section (730), a threaded section (720) and a cylindrical section (710) in sequence along the fluid flow direction. The cylindrical section (710) is clearance-fitted with the outlet (120). An internal thread that mates with the threaded section (720) is provided on the inner side of the outlet (120). The pressing section (730) is airtightly pressed against the inner end face of the outlet (120).

8. A wear-resistant valve seat according to claim 7, characterized in that, A sealing ring (500) is installed between the inner end face of the pressing section (730) and the outlet (120).

9. A wear-resistant valve seat according to claim 1, characterized in that, The second valve seat body (600) has a through hole (620) in the middle.

10. A valve, characterized in that, Includes a wear-resistant valve seat and valve body (100) according to any one of claims 1-9, wherein the wear-resistant valve seat is installed at the outlet (120) of the valve body (100).

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