Valve seat and safety valve

Abstract

The utility model belongs to the technical field of valves. The utility model provides a valve seat and a safety valve, the valve seat comprises a base body, and a concave groove is formed in the upper surface of the base body; the cross section of the groove is an inverted isosceles trapezoid with a wide upper part and a narrow lower part; and the hard alloy layer is filled in the groove. The groove is filled with the hard alloy layer, and due to high hardness and abrasion resistance, the sealing performance of the valve seat can be remarkably improved, and the service life of the valve seat can be remarkably prolonged. Meanwhile, due to the design of the inverted isosceles trapezoid groove, the contact area between the side wall of the inverted isosceles trapezoid groove and the hard alloy layer is larger, and compared with a straight wall groove, the binding force between the hard alloy layer and the base body is higher.

Description

Technical Field

[0001] This application relates to the field of valve technology, and more specifically, to a valve seat and a safety valve. Background Technology

[0002] A safety valve is a valve structure that automatically opens and closes according to the working pressure of a pressure system. The function of a safety valve is to control the pressure to not exceed the specified value, playing an important protective role for personal safety and the operation of the compressor. Safety valves are divided into liquid safety valves and gas safety valves.

[0003] The gas safety valve seat of the related technology is installed at the bottom of the gas safety valve body, and the bottom of the valve seat is set as cylindrical.

[0004] In practical applications, the valve seat needs to support the weight of the entire safety valve, which results in the valve seat being easily damaged. Utility Model Content

[0005] This application aims to address at least one of the technical problems existing in the related art.

[0006] In view of this, the first aspect of this application is to propose a valve seat.

[0007] The second aspect of this application is to provide a valve seat, comprising: a base, the upper surface of which is provided with a recessed groove; the cross-section of the groove is an inverted isosceles trapezoid that is wider at the top and narrower at the bottom; and a hard alloy layer filling the groove.

[0008] In the above technical solution, the cemented carbide layer fills the groove. Due to its high hardness and wear resistance, it can significantly improve the sealing performance and service life of the valve seat. At the same time, the inverted isosceles trapezoidal groove design allows the sidewalls of the inverted trapezoidal groove to form a larger contact area with the cemented carbide layer. Compared with straight-walled grooves, the cemented carbide layer has a stronger bonding force with the substrate.

[0009] In some technical solutions, optionally, the included angle between the two sides of the groove is 60°.

[0010] In this way, the opening width of the groove is moderate, which ensures that the cemented carbide material can flow smoothly into the bottom of the groove, reducing porosity and slag inclusions, while avoiding an excessively wide opening that would lead to an increase in the amount of welding material or excessive heat input. Thus, while ensuring filling performance, it is also more conducive to controlling the heat-affected zone of the welding and reducing thermal deformation of the substrate.

[0011] In some technical solutions, optionally, the groove opening width is 10mm and the groove bottom width is 6mm.

[0012] In some technical solutions, the groove thickness is optionally 3.5mm ± 0.1mm. The groove thickness directly affects the structural strength of the valve seat. The base thickness of 3.5mm provides sufficient mechanical support, ensuring that the valve seat will not deform or crack under pressure or impact. The ± 0.1mm tolerance allows for some flexibility in the manufacturing process while ensuring the stability of the structural strength.

[0013] In some technical solutions, optionally, the distance between the outer edge of the groove opening and the top side of the substrate is greater than or equal to 5 mm. This design ensures that the opening edge of the groove maintains a sufficient distance from the top side of the substrate, avoiding interference during subsequent processing or use. An appropriate distance can reduce the impact of deformation on the overall structure, thereby enhancing the structural strength of the substrate around the groove.

[0014] In some technical solutions, optionally, there are two grooves, symmetrically arranged along the axial centerline of the substrate. Each groove is filled with a hard alloy layer, forming a double-sealing surface structure. When the valve is closed, the double-sealing surface provides double sealing protection, significantly reducing the risk of leakage.

[0015] In some technical solutions, the distance between the outer edges of the two grooves may optionally be less than or equal to 100 mm. This ensures that the sealing surface covers the critical area of ​​the valve seat, forming an effective sealing band when the valve is closed. This helps reduce the risk of leakage and improves the valve's sealing performance.

[0016] In some technical solutions, the cemented carbide layer may optionally be a cobalt-based cemented carbide layer.

[0017] According to a second aspect of this application, a safety valve is proposed, comprising the valve seat proposed in any of the above-described technical solutions. Therefore, this safety valve possesses all the beneficial effects of any of the above embodiments, which will not be elaborated further here.

[0018] In some technical solutions, the safety valve also includes a valve top; a hard alloy layer is provided between the sealing surfaces of the valve top and the valve seat. This can further improve the service life of the safety valve.

[0019] Additional aspects and advantages of this application will become apparent in the following description or may be learned by practice of this application. Attached Figure Description

[0020] The above and / or additional aspects and advantages of this application will become apparent and readily understood from the description of the embodiments taken in conjunction with the following drawings, in which:

[0021] Figure 1 A schematic diagram of the valve seat structure in an embodiment of this application is shown.

[0022] in, Figure 1 The correspondence between the reference numerals and the component names is as follows:

[0023] 100 substrate; 110 grooves; 200 carbide layer. Detailed Implementation

[0024] To better understand the above-mentioned objectives, features, and advantages of this application, the application will be further described in detail below with reference to the accompanying drawings and specific embodiments. It should be noted that, unless otherwise specified, the embodiments and features described in these embodiments can be combined with each other.

[0025] Many specific details are set forth in the following description in order to provide a full understanding of this application. However, this application may also be implemented in other ways different from those described herein. Therefore, the scope of protection of this application is not limited to the specific embodiments disclosed below.

[0026] The following is combined with Figure 1 The valve seat and safety valve provided in this application will be described in detail through specific embodiments and application scenarios.

[0027] like Figure 1 As shown, an embodiment of this utility model provides a valve seat, the structure of which includes a substrate 10 and a hard alloy layer 200.

[0028] Specifically, the top of the substrate 100 (i.e., the sealing surface) is provided with a recessed groove 110; the cross-section of the groove 110 is an inverted isosceles trapezoid that is wider at the top and narrower at the bottom. The hard alloy layer 200 fills the groove 110.

[0029] In the above embodiment, the cemented carbide layer 200 fills the groove 110. Due to its high hardness and wear resistance, it can significantly improve the sealing performance and service life of the valve seat. At the same time, the inverted isosceles trapezoidal groove design allows the sidewalls of the inverted trapezoidal groove to form a larger contact area with the cemented carbide layer 200. Compared with straight-walled grooves, the cemented carbide layer 200 has a stronger bonding force with the substrate 100.

[0030] In practical applications, the cemented carbide layer 200 is filled into the groove 110 by welding. The wide opening of the inverted trapezoidal groove facilitates the molten cemented carbide material to flow fully into the bottom of the groove during welding, reducing porosity or incomplete fusion defects. This design effectively avoids problems such as incomplete filling or gaps caused by shape mismatch. At the same time, the high temperature generated during welding leads to differences in thermal expansion between the substrate and the alloy layer; the inverted trapezoidal structure, through the inclined design of the sidewalls, disperses thermal stress along the sidewall direction rather than concentrating it at the interface, reducing the risk of cracking.

[0031] In some embodiments, the material of the cemented carbide layer 200 is not particularly limited, and any known cemented carbide material can be selected. For example, the cemented carbide layer 200 is a cobalt-based cemented carbide layer.

[0032] In some embodiments, the included angle between the two sides of the groove 110 is 60°. This ensures that the opening width of the groove 110 is moderate, allowing the cemented carbide material to flow smoothly into the bottom of the groove, reducing porosity and slag inclusions, while preventing an excessively wide opening from increasing the amount of welding material or causing excessive heat input. This ensures good filling performance while better controlling the heat-affected zone of the weld overlay and reducing thermal deformation of the substrate 100.

[0033] In practical applications, the groove opening width of groove 110 is 10mm, and the groove bottom width of groove 110 is 6mm.

[0034] In some embodiments, the thickness of the groove is 3.5 mm ± 0.1 mm. The thickness of the groove 110 directly affects the structural strength of the valve seat. The base thickness of 3.5 mm provides sufficient mechanical support to ensure that the valve seat will not deform or break under pressure or impact. The tolerance range of ± 0.1 mm allows for some flexibility in the manufacturing process while ensuring the stability of the structural strength.

[0035] In some embodiments, the distance between the outer edge of the groove opening of the groove 110 and the top side of the base 100 is greater than or equal to 5 mm. This design ensures that the opening of the groove 110 maintains a sufficient distance from the top side of the base 100, thus avoiding interference during subsequent processing or use. An appropriate distance can reduce the impact of deformation on the overall structure, thereby enhancing the structural strength of the base 100 around the groove 110.

[0036] In some embodiments, there are two grooves 110, which are symmetrically arranged along the axial centerline of the substrate 110. Each groove 110 is filled with a hard alloy layer 200, forming a double-sealing surface structure. When the valve is closed, the double-sealing surface provides double sealing protection, significantly reducing the risk of leakage.

[0037] In practical applications, the distance between the outer edges of the two grooves 110 is less than or equal to 100mm. This ensures that the sealing surface covers the critical area of ​​the valve seat, forming an effective sealing band when the valve is closed. This helps reduce the risk of leakage and improves the valve's sealing performance.

[0038] In some embodiments, this application also proposes a safety valve comprising the valve seat described in any of the above embodiments. Thus, the safety valve possesses all the beneficial effects of any of the above embodiments, which will not be elaborated further here.

[0039] In some embodiments, the safety valve further includes a valve top; a hard alloy layer is provided between the sealing surfaces of the valve top and the valve seat. This can further improve the service life of the safety valve.

[0040] It should be clarified that in the claims, description, and accompanying drawings of this application, the term "multiple" refers to two or more objects. Unless otherwise explicitly defined, the terms "upper," "lower," etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings, and are only for the convenience of describing this application and simplifying the description process, not to indicate or imply that the device or element referred to must have the described specific orientation, or be constructed and operated in a specific orientation. Therefore, these descriptions should not be construed as limitations on this application. The terms "connection," "installation," "fixing," etc., should be interpreted broadly. For example, "connection" can be a fixed connection between multiple objects, a detachable connection between multiple objects, or an integral connection; it can be a direct connection between multiple objects or an indirect connection between multiple objects through an intermediate medium. For those skilled in the art, the specific meaning of the above terms in this application can be understood based on the specific circumstances of the above data.

[0041] In the claims, description, and accompanying drawings of this application, the terms "one embodiment," "some embodiments," "specific embodiment," etc., refer to a specific feature, structure, material, or characteristic described in connection with that embodiment or example, which is included in at least one embodiment or example of this application. In the claims, description, and accompanying drawings of this application, the illustrative expressions of the above terms do not necessarily refer to the same embodiment or example. Furthermore, the specific features, structures, materials, or characteristics described may be combined in any suitable manner in one or more embodiments or examples.

[0042] The above are merely preferred embodiments of this application and are not intended to limit this application. Various modifications and variations can be made to this application by those skilled in the art. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of this application should be included within the protection scope of this application.

Claims

1. A valve seat, characterized in that, include: The substrate has a recessed groove on its upper surface; the cross-section of the groove is an inverted isosceles trapezoid that is wider at the top and narrower at the bottom. A hard alloy layer is filled into the groove.

2. The valve seat according to claim 1, characterized in that, The included angle between the two sides of the groove is 60°.

3. The valve seat according to claim 1, characterized in that, The groove opening is 10mm wide, and the groove bottom is 6mm wide.

4. The valve seat according to claim 3, characterized in that, The thickness of the groove is 3.5mm ± 0.1mm.

5. The valve seat according to claim 1, characterized in that, The distance between the edge of the groove opening and the top side of the substrate is greater than or equal to 5 mm.

6. The valve seat according to any one of claims 1 to 5, characterized in that, There are two grooves, which are symmetrically arranged along the axial centerline of the substrate.

7. The valve seat according to claim 6, characterized in that, The distance between the outer edges of the two grooves is less than or equal to 100 mm.

8. The valve seat according to any one of claims 1 to 5, characterized in that, The cemented carbide layer is a cobalt-based cemented carbide layer.

9. A safety valve, characterized in that, Includes the valve seat as described in any one of claims 1 to 8.

10. The safety valve according to claim 9, characterized in that, It also includes the valve top; The hard alloy layer is provided between the sealing surfaces of the valve top and the valve seat.

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