A valve core structure of an axial flow type flow valve and an axial flow type flow valve

Abstract

The utility model discloses a valve core structure of axial flow type flow valve, including the coaxial arrangement valve core main part, valve core buffer pressure axle and valve seat, valve core buffer pressure axle installs on valve core main part and valve core buffer pressure axle stretches into the valve seat, the one side of valve core main part is equipped with first sealing surface close to valve core buffer pressure axle, first sealing surface has the first smooth transition surface of surfacing and polishing formation, the one side of valve seat is equipped with second sealing surface close to valve core main part, second sealing surface has the second smooth transition surface of surfacing and polishing formation, the inner wall of valve seat is equipped with third sealing surface, valve core buffer pressure axle outer wall is equipped with fourth sealing surface and fourth sealing surface has the third smooth transition surface of surfacing and polishing formation, wherein, first smooth transition surface and second smooth transition surface are in contact, third smooth transition surface and third sealing surface are in contact. The utility model can solve the sealing connection defect problem of the existing valve core due to the process limitation.

Description

Technical Field

[0001] This utility model relates to the field of valve technology, and in particular to a valve core structure and an axial flow valve. Background Technology

[0002] Axial flow control valves, as core control components of industrial pipeline systems, are widely used in petrochemical, power energy, water supply and drainage and other fields. Their performance directly affects the stability and safety of fluid transportation.

[0003] In the field of axial flow control valves, the design of the valve core structure plays a crucial role in the valve's sealing performance and regulation accuracy. Currently, common axial flow control valve core structures on the market (such as...) Figure 1 As shown in the diagram, hard alloy needs to be welded onto valve core A to meet usage requirements. However, due to limitations in the welding process, it is difficult to machine the right-angled part of the valve core to be perfectly smooth, resulting in an imperfect connection between it and the valve seat seal. This negatively impacts the valve's sealing performance, easily leading to leakage problems. Consequently, it affects the operational stability and flow regulation accuracy of the axial flow control valve, failing to meet the requirements of some industrial applications with high sealing requirements, such as high-precision fluid control systems and chemical fluid transport systems.

[0004] Therefore, there is an urgent need for an improved valve core structure to solve the sealing connection defects caused by the process limitations of existing valve cores and improve the overall performance of axial flow control valves. Utility Model Content

[0005] To address the shortcomings of the prior art, this utility model provides a valve core structure and an axial flow valve that can improve sealing performance.

[0006] To solve the above-mentioned technical problems, the present invention adopts the following technical solution: a valve core structure for an axial flow valve, comprising a valve core body, a valve core pressure-reducing shaft, and a valve seat coaxially arranged, wherein the valve core pressure-reducing shaft is mounted on the valve core body and extends into the valve seat; a first sealing surface is provided on the side of the valve core body near the valve core pressure-reducing shaft, the first sealing surface having a first smooth transition surface formed by welding and grinding; a second sealing surface is provided on the side of the valve seat near the valve core body, the second sealing surface having a second smooth transition surface formed by welding and grinding; a third sealing surface is provided on the inner wall of the valve seat; and a fourth sealing surface is provided on the outer wall of the valve core pressure-reducing shaft, the fourth sealing surface having a third smooth transition surface formed by welding and grinding; wherein the first smooth transition surface is in contact with the second smooth transition surface, and the third smooth transition surface is in contact with the third sealing surface.

[0007] Furthermore, the first sealing surface is axially recessed in the middle to form a first limiting step, and the valve core pressure relief shaft extends axially on one side near the valve core body to form a first limiting boss that cooperates with the first limiting step.

[0008] Furthermore, the second sealing surface has an axially extending flange, and the second smooth transition surface is disposed on the extending flange to abut against the first smooth transition surface.

[0009] Furthermore, the extended flange and the corresponding second sealing surface of the valve seat enclose each other to form an annular mounting portion for accommodating the seal.

[0010] Furthermore, a threaded hole is provided on one side of the valve core body in the circumferential direction, and a mounting hole is provided on one side of the valve core pressure relief shaft in the circumferential direction.

[0011] Furthermore, the third sealing surface extends at an angle toward the valve seat side toward the second sealing surface to form a guide surface.

[0012] Furthermore, the valve core body and the valve core pressure relief shaft have corresponding pressure stabilizing holes.

[0013] Furthermore, the first smooth transition surface, the second smooth transition surface, and the third smooth transition surface are hard alloy layers that have been welded together.

[0014] This utility model also provides an axial flow valve, which includes the valve core structure of the above-mentioned axial flow valve.

[0015] In summary, this utility model has the following beneficial effects:

[0016] (1) Compared with the prior art, the present invention splits the valve core into the valve core body and the valve core pressure relief shaft. By welding and grinding the first sealing surface, the second sealing surface and the fourth sealing surface of each component respectively, a smooth transition surface is formed. The structure of the three parts after splitting is more simplified, which can break through the limitation of welding process on the right angle processing of integrated valve core, and allow each sealing surface to be precisely processed into a smooth transition surface, avoiding sealing failure caused by process defects.

[0017] (2) The valve core body and the valve core pressure relief shaft are fitted together by the first limiting step and the first limiting boss to limit the axial position of the valve core pressure relief shaft on the valve core body. At the same time, the valve core pressure relief shaft is fixedly installed on the valve core body. Combined with the cooperation between the valve core pressure relief shaft and the valve seat, the valve core body and the valve seat seal are tightly sealed, improving the stable sealing effect of the valve. Attached Figure Description

[0018] Figure 1 This is a schematic diagram of the structure of a valve core and valve seat in the prior art.

[0019] Figure 2This is a schematic diagram of the valve core structure of a flow valve.

[0020] Figure 3 This is an assembly drawing of the valve core body, valve core pressure relief shaft, and valve seat.

[0021] Figure 4 for Figure 2 A magnified view of a section at point B.

[0022] The reference numerals in the attached drawings are explained as follows: 1. Valve core body; 11. First sealing surface; 12. First smooth transition surface; 13. First limiting step; 14. Threaded hole; 15. Pressure stabilizing hole; 2. Valve core pressure relief shaft; 21. Fourth sealing surface; 22. Third smooth transition surface; 23. First limiting boss; 24. Mounting hole; 3. Valve seat; 31. Second sealing surface; 32. Second smooth transition surface; 33. Extending flange; 34. Third sealing surface; 35. Guide surface. Detailed Implementation

[0023] The present invention will be further described in detail below with reference to the embodiments.

[0024] like Figure 2 , Figure 3 and Figure 4 As shown, this embodiment provides a valve core structure for an axial flow valve, including a valve core body 1, a valve core pressure-reducing shaft 2, and a valve seat 3 that are coaxially connected in sequence. The valve core pressure-reducing shaft 2 is detachably mounted on the valve core body 1, and the valve core pressure-reducing shaft 2 extends into the valve seat 3 such that the outer wall of the valve core pressure-reducing shaft 2 mates with the inner wall of the valve seat 3. The valve core body 1 has a first sealing surface 11 on the side near the valve core pressure-reducing shaft 2, and the first sealing surface 11 has a first smooth transition surface 12 formed by welding and grinding. The valve seat 3 has a second sealing surface 31 on the side near the valve core body 1, and the second sealing surface 31 has a second smooth transition surface 32 formed by welding and grinding. The outer wall of the valve core pressure-reducing shaft 2 has a fourth sealing surface 21, and the fourth sealing surface 21 has a third smooth transition surface 22 formed by welding and grinding.

[0025] Will as Figure 1 The valve core shown is disassembled into Figure 2 The valve core body 1 and valve core pressure-relieving shaft 2 are configured such that a first smooth transition surface 12 is formed by welding and grinding on the first sealing surface 11 of the valve core body 1, a second smooth transition surface 32 is formed by welding and grinding on the second sealing surface 31 of the valve seat 3, and a third smooth transition surface 22 is formed by welding and grinding on the fourth sealing surface 21 of the valve core pressure-relieving shaft 2. Figure 4As shown, the first smooth transition surface 12, the second smooth transition surface 32, and the third smooth transition surface 22 are all hard alloy layers formed by welding and polishing. This creates a smooth transition at the joint of the three parts, resulting in a tight seal and improved sealing performance. Compared to the existing connection method between the valve core and valve seat 3, this method overcomes the limitation of welding on the right-angle machining of the integrated valve core, allowing each sealing surface to be precisely machined into a smooth transition surface, avoiding sealing failure due to process defects. In specific implementation, one side of the valve core pressure relief shaft 2 extends axially at an angle to the fourth sealing surface 21, forming a guide slope. This reduces the area of ​​the third smooth transition surface 22, thereby reducing the contact area with the inner wall of the valve seat 3, facilitating installation and disassembly.

[0026] During implementation, the first sealing surface 11 is axially recessed in the middle to form a first limiting step 13, and the valve core pressure-relieving shaft 2 extends axially on one side near the valve core body 1 to form a first limiting boss 23 that mates with the first limiting step 13. The connection between the valve core body 1 and the valve core pressure-relieving shaft 2 provides support for stable sealing and precise flow regulation. The fit between the two can strictly limit the axial position of the valve core pressure-relieving shaft 2 on the valve core body 1, avoid assembly misalignment, and ensure the overall structural stability of the valve core pressure-relieving shaft 2, the valve core body 1, and the valve seat 3. In this way, the first smooth transition surface 12, the second smooth transition surface 32, and the third smooth transition surface 22 fit more tightly, reducing the sealing gap and helping to enhance the sealing performance.

[0027] In implementation, the second sealing surface 31 has an axially extending flange 33, and the second smooth transition surface 32 is disposed on the flange 33 to abut against the first smooth transition surface 12. The flange 33 and the valve seat 3 corresponding to the second sealing surface 31 enclose an annular mounting portion for accommodating the sealing element. Based on the smooth transition surface sealing, a sealing element such as a sealing ring is added to improve the sealing level.

[0028] A threaded hole 14 is provided on one side of the valve core body 1 in the circumferential direction, and a mounting hole 24 is provided on one side of the valve core pressure-relieving shaft 2 in the circumferential direction. The two are fixedly connected by bolts to prevent loosening from affecting the seal. At the same time, pressure-stabilizing holes 15 are provided on the valve core body 1 and the valve core pressure-relieving shaft 2 respectively to balance the internal pressure of the valve core and reduce pressure fluctuations during flow regulation.

[0029] To facilitate the installation of the valve core pressure relief shaft 2, the inner wall of the valve seat 3 has a third sealing surface 34 that fits with the third smooth transition surface 22. One side of the valve seat 3 extends obliquely toward the second sealing surface 31 to the third sealing surface 34 to form a guide surface 35.

[0030] This embodiment also relates to an axial flow valve, which includes the valve core structure of the above-mentioned axial flow valve. At the same time, pressure stabilizing holes 15 are correspondingly opened on the valve core body 1 and the valve core pressure relief shaft 2 to balance the internal pressure of the valve core and reduce pressure fluctuations during flow regulation.

[0031] The above description is only a preferred embodiment of the present utility model and is not intended to limit the present utility model. Any modifications, equivalent substitutions and improvements made within the spirit and principles of the present utility model should be included within the protection scope of the present utility model.

Claims

1. A valve core structure for an axial flow valve, characterized in that, The valve includes a valve core body (1), a valve core pressure relief shaft (2), and a valve seat (3) arranged coaxially. The valve core pressure relief shaft (2) is mounted on the valve core body (1) and extends into the valve seat (3). The valve core body (1) has a first sealing surface (11) on the side near the valve core pressure relief shaft (2). The first sealing surface (11) has a first smooth transition surface (12) formed by welding and grinding. The valve seat (3) has a second sealing surface (31) on the side near the valve core body (1). The second sealing surface (31) has a second smooth transition surface (32) formed by welding and grinding, the inner wall of the valve seat (3) is provided with a third sealing surface (34), the outer wall of the valve core pressure relief shaft (2) is provided with a fourth sealing surface (21), and the fourth sealing surface (21) has a third smooth transition surface (22) formed by welding and grinding; wherein, the first smooth transition surface (12) is in contact with the second smooth transition surface (32), and the third smooth transition surface (22) is in contact with the third sealing surface (34).

2. The valve core structure of the axial flow valve according to claim 1, characterized in that, The first sealing surface (11) is axially recessed in the middle to form a first limiting step (13), and the valve core pressure relief shaft (2) extends axially on one side near the valve core body (1) to form a first limiting boss (23) that cooperates with the first limiting step (13).

3. The valve core structure of the axial flow valve according to claim 2, characterized in that, The second sealing surface (31) has an axially extending extension flange (33), and the second smooth transition surface (32) is provided on the extension flange (33) to abut against the first smooth transition surface (12).

4. The valve core structure of the axial flow valve according to claim 3, characterized in that, The extended flange (33) and the valve seat (3) corresponding to the second sealing surface (31) enclose each other to form an annular mounting portion for accommodating the seal.

5. The valve core structure of the axial flow valve according to claim 1, characterized in that, The valve core body (1) has a threaded hole (14) on one side and a mounting hole (24) on one side.

6. The valve core structure of the axial flow valve according to claim 5, characterized in that, The valve seat (3) extends at an angle toward the second sealing surface (31) to the third sealing surface (34) to form a guide surface (35).

7. The valve core structure of the axial flow valve according to claim 5, characterized in that, The valve core body (1) and the valve core pressure relief shaft (2) have corresponding pressure stabilizing holes (15).

8. The valve core structure of the axial flow valve according to claim 1, characterized in that, The first smooth transition surface (12), the second smooth transition surface (32) and the third smooth transition surface (22) are hard alloy layers that are welded together.

9. An axial flow valve, characterized in that, A valve core structure comprising the axial flow valve as described in any one of claims 1-8.

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