Valve seat structure of hard sealing ball valve
By adopting a trapezoidal cross-section graphite ring and spring seat structure in the hard seal ball valve, combined with the dust-proof design of the graphite rope, the problems of existing hard seal ball valve sealing failure and limited ductility of graphite sealing ring are solved, and better sealing effect and service life are achieved.
Patent Information
- Application Number
- CN202420933265.6
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2024-04-29
- Publication Date
- 2025-05-16
- Estimated Expiration
- 2034-04-29
AI Technical Summary
The seat sealing method of existing hard seal ball valves has the problem of seal failure caused by the accumulation of silicon powder or fine debris, and the ductility of the graphite sealing ring is limited, and the sealing effect cannot be achieved after use for a period of time.
A hard sealed ball valve seat structure is designed, adopting a trapezoidal cross-section graphite ring and spring seat structure. One end surface of the graphite ring is fitted with the valve seat. The spring seat applies force to the graphite ring to form a larger sealing contact surface, and increases dustproof effect in the sealing groove through a graphite rope.
It improves the sealing effect of the ball valve, extends the service life, enhances dust resistance, and has better ductility of the trapezoidal graphite ring, which can maintain sealing performance for more lasting time.
Smart Images
Figure CN222880399U_ABST
Abstract
Description
Technical Field
[0001] The utility model relates to the technical field of valves, in particular to a hard-sealed ball valve seat structure. Background Art
[0002] Hard-sealed ball valves are resistant to high and low temperatures and are widely used in the polysilicon production industry. In the prior art, the valve seat sealing method of hard-sealed ball valves is generally as follows: a flat graphite sealing ring is installed between the valve seat and the valve body, and the graphite sealing ring is squeezed by a spring seat arranged at the bottom of the graphite sealing ring; the graphite sealing ring is squeezed and extended toward the inner valve seat to fill the gap between the valve seat and the valve body, thereby sealing the gap between the valve seat and the valve body and preventing the medium from entering the cavity and the flow channel.
[0003] However, since silicon powder is a very fine solid particle, it will accumulate in the gap between the valve seat and the spring seat, and between the spring seat and the valve body during use; long-term use will cause the valve seat to be stuck by the accumulation of silicon powder or fine debris; the spring will also get stuck and the elastic mechanism will fail, further causing leakage at the graphite sealing ring; moreover, the ductility of existing graphite sealing rings is limited. After a period of use, they can no longer achieve a sealing effect by stretching, resulting in internal leakage. Utility Model Content
[0004] In view of this, the utility model provides a hard-sealed ball valve seat structure, the main purpose of which is to improve the sealing effect of the ball valve and extend its service life.
[0005] In order to achieve the above purpose, the utility model mainly provides the following technical solutions:
[0006] The embodiment of the utility model provides a hard-sealed ball valve seat structure, comprising: a valve body, a valve seat, a spring seat, a spring and a graphite ring;
[0007] The valve body is provided with a spring hole;
[0008] The valve seat is arranged in the valve body; the outer wall of the valve seat has a matching surface 1 for matching with the valve body; the outer wall of the valve seat has a matching surface 2 for matching with the valve body; the matching surface 1 and the matching surface 2 are coaxially distributed and spaced apart;
[0009] The graphite ring is arranged between the valve body and the valve seat, and is located between the first matching surface and the second matching surface; the cross section of the graphite ring is a trapezoid;
[0010] One end surface of the graphite ring is in contact with the valve seat;
[0011] The spring seat is arranged between the valve body and the valve seat, and is located between the first matching surface and the second matching surface; one end surface of the spring seat is in contact with the other end surface of the graphite ring;
[0012] One end of the spring is arranged in the spring hole, and the other end of the spring is placed on the spring seat, so as to apply a force to the spring seat toward the graphite ring;
[0013] The matching surface 1 is provided with a sealing groove 1; and the sealing groove 1 is provided with a graphite rope 1;
[0014] The second matching surface is provided with a second sealing groove; and the first sealing groove is provided with a second graphite rope.
[0015] Furthermore, a matching surface three and a matching surface four are provided on the outer wall of the valve seat; the matching surface three and the matching surface four are sequentially distributed between the matching surface one and the matching surface two along the axial direction;
[0016] The matching surface three is an inclined surface, used to match with one end surface of the graphite ring;
[0017] The outer diameter of the matching surface 4 is smaller than that of the matching surface 1;
[0018] The inner wall of the graphite ring is sleeved on the outer side of the matching surface 4.
[0019] Further, the outer diameter of the second matching surface is smaller than the outer diameter of the fourth matching surface;
[0020] A step is formed between the second matching surface and the fourth matching surface;
[0021] The main body of the spring seat matches the second matching surface; one end of the spring seat can extend to the position where the fourth matching surface is located;
[0022] A buffer space is provided at the step between the spring seat and the valve seat.
[0023] Furthermore, the cross section of the graphite ring is a bilaterally symmetrical trapezoidal shape;
[0024] One end surface of the spring seat matches the contact surface of the graphite ring.
[0025] Furthermore, the bottom angle of the cross section of the graphite ring is 30-60°.
[0026] Furthermore, the ratio of the lower base to the upper base of the cross section of the graphite ring is 6:1 to 5:2.
[0027] Furthermore, the short side of the cross section of the graphite ring is 1.5 to 2 mm smaller than the height of the matching surface 29.
[0028] Furthermore, the structure of the sealing groove 1 is the same as that of the sealing groove 2;
[0029] The specifications of the graphite rope 1 and the graphite rope 2 are the same.
[0030] Furthermore, the width of the sealing groove 1 is 3 mm;
[0031] The diameter of the graphite rope is 3-3.5 mm.
[0032] Furthermore, the lower end of the valve seat has a chamfer.
[0033] By means of the above technical solution, the hard-sealed ball valve seat structure of the utility model has at least the following advantages:
[0034] It can improve the sealing effect of the ball valve and extend its service life.
[0035] The above description is only an overview of the technical solution of the utility model. In order to more clearly understand the technical means of the utility model and implement it according to the contents of the specification, the following is a detailed description of the preferred embodiments of the utility model in conjunction with the accompanying drawings. BRIEF DESCRIPTION OF THE DRAWINGS
[0036] Figure 1 A schematic diagram of a hard-sealed ball valve seat structure provided in an embodiment of the utility model;
[0037] Figure 2 A schematic diagram of a hard-sealed ball valve seat structure provided by an embodiment of the utility model after the valve body is removed;
[0038] Figure 3 A schematic diagram of a valve seat in a hard-sealed ball valve seat structure provided in an embodiment of the utility model.
[0039] As shown in the figure:
[0040] 1 is a valve body, 1-1 is a spring hole, 2 is a valve seat, 2-1 is a sealing groove one, 2-2 is a sealing groove two, 2-3 is a matching surface one, 2-4 is a matching surface three, 2-5 is a matching surface four, 2-6 is a matching surface two, 3 is a graphite ring, 4 is a spring seat, 5 is a spring, 6 is a graphite rope one, 7 is a graphite rope two, and 8 is a buffer space. DETAILED DESCRIPTION
[0041] In order to further explain the technical means and effects adopted by the utility model to achieve the predetermined utility model purpose, the specific implementation methods, structures, features and effects of the utility model application are described in detail below in conjunction with the accompanying drawings and preferred embodiments. In the following description, different "one embodiment" or "embodiment" does not necessarily refer to the same embodiment. In addition, specific features, structures, or characteristics in one or more embodiments may be combined in any suitable form.
[0042] like Figures 1 to 3 As shown, a hard-sealed ball valve seat structure proposed in one embodiment of the utility model includes: a valve body 1, a valve seat 2, a spring seat 4, a spring 5 and a graphite ring 3; the valve body 1 is provided with a spring hole 1-1 for accommodating and supporting the spring 5; the spring hole 1-1 is arranged on the valve body 1, which is convenient for assembling the valve seat 2. The spring hole 1-1 is opened on the valve body 1, which can reduce the spring 5 from falling when the valve is installed on the valve seat 2. The spring 5 generally uses a cold-rolled compression spring 5 of 750 material, and the length of the spring 5 is preferably 15 to 20 mm; the depth of the spring hole 1-1 is preferably 8 to 10 mm, and the gap between the bottom of the spring seat 4 and the valve body 1 is preferably 3 to 5 mm; the compression amount of the spring 5 is preferably 4 to 5 mm. The valve seat 2 is arranged in the valve body 1; the outer wall of the valve seat 2 has a matching surface 1 2-3 for matching with the valve body 1; the outer wall of the valve seat 2 has a matching surface 2-6 for matching with the valve body 1; the matching surface 1 2-3 and the matching surface 2 2-6 are coaxially distributed and arranged at intervals; the graphite ring 3 is arranged between the valve body 1 and the valve seat 2, and is located between the matching surface 1 2-3 and the matching surface 2 2-6; the cross section of the graphite ring 3 is a trapezoid; one end face of the graphite ring 3 fits with the valve seat 2 to ensure a larger contact area. The spring seat 4 is arranged between the valve body 1 and the valve seat 2, and is located between the matching surface 1 2-3 and the matching surface 2 2-6; one end face of the spring seat 4 fits with the other end face of the graphite ring 3; one end of the spring 5 is arranged in the spring hole 1-1, and the other end of the spring 5 is placed on the spring seat 4 to apply a force to the spring seat 4 toward the graphite ring 3.
[0043] The matching surface 1-2-3 has a sealing groove 1-2-1; a graphite rope 1-6 is arranged in the sealing groove 1-2-1; the matching surface 2-6 has a sealing groove 2-2; a graphite rope 2-7 is arranged in the sealing groove 1-2-1. The graphite rope 1-6 and the graphite rope 2-7 have a good function of blocking dust or debris. The graphite rope 2-7 can block the small debris entering from the valve inlet, and the graphite rope 1-6 at the upper end can block the small debris stored in the cavity after the valve is opened and closed. The graphite rope 1-6 and the graphite rope 2-7 ensure that dust and small particles cannot enter the sealing area and the spring 5 area.
[0044] A hard-sealed ball valve seat structure proposed in an embodiment of the utility model can improve the sealing effect of the ball valve, greatly increase the dustproof effect of the valve, and ensure its function even when used in pipelines with poor working conditions; the sealing ability of the ball valve is more durable, and the graphite ring 3 with a trapezoidal cross-section has better ductility, which extends the service life; and the sealing contact surface is larger.
[0045] An embodiment of the utility model provides a hard-sealed ball valve seat structure, which is more convenient when assembling the valve, and the buffer distance between the spring seat 4 and the valve seat 2 better ensures the sealing performance of the valve.
[0046] As a preferred embodiment of the above embodiment, the outer wall of the valve seat 2 is provided with a matching surface three 2-4 and a matching surface four 2-5; the matching surface three 2-4 and the matching surface four 2-5 are distributed in sequence between the matching surface one 2-3 and the matching surface two 2-6 along the axial direction; the matching surface three 2-4 is an inclined surface for matching with one end face of the graphite ring 3; preferably, the inclination angle of the matching surface three 2-4 is 45°; the outer diameter of the matching surface four 2-5 is smaller than that of the matching surface one 2-3; the inner wall of the graphite ring 3 is sleeved on the outer side of the matching surface four 2-5; the spring seat 4 squeezes the graphite ring 3 toward the matching surface three 2-4 to form a sealing surface; the ductility of the graphite ring 3 is increased, the service life is extended, and the sealing contact surface is larger.
[0047] As a preferred embodiment of the above embodiment, the outer diameter of the matching surface two 2-6 is smaller than the outer diameter of the matching surface four 2-5; a step is formed between the matching surface two 2-6 and the matching surface four 2-5; the main body of the spring seat 4 matches the matching surface two 2-6; one end of the spring seat 4 can extend to the position where the matching surface four 2-5 is located; there is a buffer space 8 at the step between the spring seat 4 and the valve seat 2, ensuring that the spring 5 is effective during expansion and contraction, and can continuously push the spring seat 4 toward the matching surface three 2-4, so that the seal lasts longer and the service life is longer.
[0048] As a preferred embodiment of the above, the cross section of the graphite ring 3 is a bilaterally symmetrical trapezoidal shape; one end surface of the spring seat 4 matches the contact surface of the graphite ring 3, and the sealing surfaces are the same, both having a larger sealing surface.
[0049] As a preferred embodiment of the above, the bottom angle of the cross section of the graphite ring 3 is 30-60°, which can ensure a larger contact area. Further preferably, the bottom angle of the cross section of the graphite ring 3 is 45°.
[0050] As a preference of the above embodiment, the ratio of the lower bottom to the upper bottom of the cross section of the graphite ring 3 is 6:1 to 5:2, which has a better sealing effect.
[0051] As a preferred embodiment of the above embodiment, the short side of the cross section of the graphite ring 3 is 1.5 to 2 mm smaller than the height of the matching surface four 2-5, so that the inner wall of the graphite ring 3 can match the matching surface four 2-5.
[0052] As a preferred embodiment of the above, the sealing groove 1 2-1 has the same structure as the sealing groove 2-2; the graphite rope 1 6 has the same specifications as the graphite rope 2 7, so as to facilitate processing and manufacturing. Further preferred, the width of the sealing groove 1 2-1 is 3 mm; the diameter of the graphite rope 1 6 is 3 to 3.5 mm, which has a better sealing effect.
[0053] As a preferred embodiment of the above embodiment, the lower end of the valve seat 2 has a chamfer; the tail end of the valve seat 2 is chamfered to provide better anti-scouring capability; preferably, the chamfer is 45° and the chamfer distance is 3mm to ensure that there will be no large resistance, severe scouring or internal vortex when the medium enters or passes through the valve.
[0054] Further explanation, although the terms first, second, etc. can be used to describe various elements in this article, these terms should not limit these elements. These terms are only used to distinguish one element from another element. For example, the first element can be called the second element, and, similarly, the second element can be called the first element, and these terms are only used to distinguish one element from another element. This does not depart from the scope of exemplary embodiments. Similarly, element one and element two do not represent the order of elements, and these terms are only used to distinguish one element from another element. As used herein, the term "and / or" includes any combination and all combinations of one or more associated listed items.
[0055] In the description of the present invention, unless otherwise clearly specified and limited, the terms "installed", "connected", "connected", and "fixed" should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection or an indirect connection through an intermediate medium, it can be the internal connection of two elements or the interaction relationship between two elements. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.
[0056] The standard parts used in the utility model can all be purchased from the market, and special-shaped parts can be customized according to the instructions and the drawings. The specific connection methods of each part adopt the conventional means such as mature bolts, rivets, welding, etc. in the existing technology. The machinery, parts and equipment all adopt the conventional models in the existing technology, and the circuit connection adopts the conventional connection method in the existing technology, which will not be described in detail here.
[0057] The above is only a preferred embodiment of the present invention and does not constitute any form of limitation to the present invention. Any simple modification, equivalent changes and modifications made to the above embodiments based on the technical essence of the present invention still fall within the scope of the technical solution of the present invention.
Claims
1. A hard-sealed ball valve seat structure, characterized in that: Including: valve body, valve seat, spring seat, spring and graphite ring; The valve body is provided with a spring hole; The valve seat is arranged in the valve body; the outer wall of the valve seat has a matching surface 1 for matching with the valve body; the outer wall of the valve seat has a matching surface 2 for matching with the valve body; the matching surface 1 and the matching surface 2 are coaxially distributed and spaced apart; The graphite ring is arranged between the valve body and the valve seat, and is located between the first matching surface and the second matching surface; the cross section of the graphite ring is a trapezoid; One end surface of the graphite ring is in contact with the valve seat; The spring seat is arranged between the valve body and the valve seat, and is located between the first matching surface and the second matching surface; one end surface of the spring seat is in contact with the other end surface of the graphite ring; One end of the spring is arranged in the spring hole, and the other end of the spring is placed on the spring seat, so as to apply a force to the spring seat toward the graphite ring; The matching surface 1 is provided with a sealing groove 1; and the sealing groove 1 is provided with a graphite rope 1; The second matching surface is provided with a second sealing groove; and the first sealing groove is provided with a second graphite rope.
2. The hard-sealed ball valve seat structure according to claim 1, characterized in that: The outer wall of the valve seat is provided with a matching surface three and a matching surface four; the matching surface three and the matching surface four are sequentially distributed between the matching surface one and the matching surface two along the axial direction; The matching surface three is an inclined surface, used to match with one end surface of the graphite ring; The outer diameter of the matching surface 4 is smaller than that of the matching surface 1; The inner wall of the graphite ring is sleeved on the outer side of the matching surface 4.
3. The hard-sealed ball valve seat structure according to claim 2, characterized in that: The outer diameter of the second matching surface is smaller than the outer diameter of the fourth matching surface; A step is formed between the second matching surface and the fourth matching surface; The main body of the spring seat matches the second matching surface; one end of the spring seat can extend to the position where the fourth matching surface is located; A buffer space is provided at the step between the spring seat and the valve seat.
4. The hard-sealed ball valve seat structure according to claim 1, characterized in that: The cross section of the graphite ring is a bilaterally symmetrical trapezoidal shape; One end surface of the spring seat matches the contact surface of the graphite ring.
5. The hard-sealed ball valve seat structure according to claim 4, characterized in that: The bottom angle of the cross section of the graphite ring is 30-60°.
6. The hard-sealed ball valve seat structure according to claim 5, characterized in that: The ratio of the lower base to the upper base of the cross section of the graphite ring is 6:1 to 5:
2.
7. The hard-sealed ball valve seat structure according to claim 2, characterized in that: The short side of the cross section of the graphite ring is 1.5 to 2 mm smaller than the height of the matching surface 29.
8. The hard-sealed ball valve seat structure according to claim 1, characterized in that: The structure of the sealing groove 1 is the same as that of the sealing groove 2; The specifications of the graphite rope 1 and the graphite rope 2 are the same.
9. The hard-sealed ball valve seat structure according to claim 8, characterized in that: The width of the sealing groove 1 is 3 mm; The diameter of the graphite rope 1 is 3-3.5 mm.
10. The hard-sealed ball valve seat structure according to claim 1, characterized in that: The lower end of the valve seat has a chamfer.