Main valve assembly welding method and switching valve

Abstract

The invention provides a main valve assembly welding method and a switching valve, and the main valve assembly welding method comprises the steps that the periphery of an avoiding hole is divided into N welding sections, N is larger than or equal to 3, a first side is provided with at least one welding section, and a second side is provided with at least one welding section; and each welding section is welded to the main valve seat, and after welding is completed, a continuous annular welding seam is formed between the main valve body and the main valve seat. According to the scheme, the annular welding seam formed by continuous welding in the main valve assembly in the prior art is divided into at least three sections which are distributed on the two opposite sides of the main valve seat, then each welding section is welded, and finally the annular welding seam is formed, so that the situation that the main valve seat is continuously heated during continuous welding can be avoided; and the heating position of the main valve seat is dispersed by changing the welding position, so that the concentration of welding heat in a local position is reduced, the welding deformation of the main valve seat is reduced, and the product quality is improved.

Description

Technical Field

[0001] The present invention relates to the field of valve technology, and in particular to a main valve assembly welding method and a switching valve. Background Art

[0002] The main valve assembly of a switching valve consists of a main valve body and a main valve seat. The main valve seat is located within the main valve body and welded to it. To ensure a seal between the two, the main valve seat must be welded to the main valve body along its entire circumference. Due to the long weld seam and the thin thickness of the main valve seat in the welded area, the main valve seat deforms significantly after welding. This affects the seal between the main valve seat and the slider that slides within the main valve body, thereby affecting the performance of the switching valve. Therefore, it is necessary to minimize deformation of the main valve seat during welding, but existing processing techniques are ineffective and require optimization. Summary of the Invention

[0003] The present invention provides a main valve assembly welding method and a switching valve, so as to solve the problem in the prior art that a main valve seat in a main valve assembly is greatly deformed after welding.

[0004] In order to solve the above problems, according to one aspect of the present invention, the present invention provides a main valve assembly welding method, the main valve assembly includes a main valve body and a main valve seat, the side wall of the main valve body has a long strip of avoidance hole, the main valve seat is located in the main valve body and corresponds to the avoidance hole, the main valve seat has a first side and a second side relative to each other along the length direction, and a first through hole, a second through hole and a third through hole are provided between the first side and the second side, which are arranged in sequence along the length direction of the main valve seat. The main valve assembly welding method includes: along the periphery of the avoidance hole, pre-dividing the annular weld to be welded into N welding sections, N≥3, the first side has at least one welding section, and the second side has at least one welding section; welding each welding section, and after the welding is completed, an annular weld is formed between the main valve body and the main valve seat.

[0005] Furthermore, the segmentation points of the N welding segments include at least three of the following four points:

[0006] Point B is located between the first through hole and the second through hole and on the first side;

[0007] Point D is located between the second through hole and the third through hole and on the first side;

[0008] Point J is located between the first through hole and the second through hole and on the second side;

[0009] Point H is located between the second through hole and the third through hole and on the second side.

[0010] Furthermore, the two points closest to the first through hole and the second through hole are the first point and the second point respectively, and the two points closest to the second through hole and the third through hole are the third point and the fourth point respectively; in the width direction of the main valve seat, the tangent of the first through hole at the first point is the first tangent, the tangent of the second through hole at the second point is the second tangent, the tangent of the second through hole at the third point is the third tangent, and the tangent of the third through hole at the fourth point is the fourth tangent; wherein, point B and point J are both located between the first tangent and the second tangent, and point D and point H are both located between the third tangent and the fourth tangent.

[0011] Furthermore, N ≥ 4, the segmentation points of the N welding segments include point B, point D, point J, and point H, and the N welding segments are welded in the following order:

[0012] Weld the BD and JH segments first, and then weld the other welding segments.

[0013] Furthermore, the welding directions of the BD segment and the JH segment are the same.

[0014] Furthermore, when welding other welding sections, welding is performed from the middle of the main valve seat to the end of the main valve seat.

[0015] Furthermore, the segmentation points of the N welding segments also include:

[0016] Point F is located at the end of the main valve seat and on the side of the third through hole away from the first through hole;

[0017] Point L is located at the end of the main valve seat and on a side of the first through hole facing away from the third through hole.

[0018] Furthermore, laser welding or argon arc welding is used for welding.

[0019] Furthermore, the main valve seat has a relative plane and arc surface, the first through hole, the second through hole and the third through hole all pass through the plane and the arc surface, the arc surface corresponds to the avoidance hole, and the welding position of the main valve seat is located on the arc surface.

[0020] According to another aspect of the present invention, a switching valve is provided. The switching valve includes a main valve assembly. The main valve assembly includes a main valve body and a main valve seat. The main valve body and the main valve seat are welded using the above-mentioned main valve assembly welding method.

[0021] Applying the technical solution of the present invention, a main valve assembly welding method is provided, wherein the main valve assembly includes a main valve body and a main valve seat, and a long strip-shaped avoidance hole is provided on the side wall of the main valve body. The main valve seat is located in the main valve body and corresponds to the avoidance hole. The main valve seat has a first side and a second side relative to each other along the length direction, and a first through hole, a second through hole and a third through hole are provided between the first side and the second side, which are sequentially arranged along the length direction of the main valve seat. The main valve assembly welding method includes: dividing the periphery of the avoidance hole into N welding sections, N≥3, the first side having at least one welding section, and the second side having at least one welding section; welding each welding section to the main valve seat respectively, and forming a continuous annular weld between the main valve body and the main valve seat after the welding is completed. In this solution, the annular weld formed by continuous welding in the main valve assembly of the prior art is divided into at least three sections and distributed on opposite sides of the main valve seat. Each welding section is then welded separately to finally form an annular weld. This can avoid continuous heating of the main valve seat during continuous welding, and disperse the heating position of the main valve seat by changing the welding position, thereby reducing the concentration of welding heat in local positions, reducing the welding deformation of the main valve seat, and improving product quality. BRIEF DESCRIPTION OF THE DRAWINGS

[0022] The accompanying drawings, which constitute part of this application, are intended to provide a further understanding of the present invention. The exemplary embodiments of the present invention and their descriptions are intended to explain the present invention and do not constitute an undue limitation of the present invention. In the accompanying drawings:

[0023] Figure 1 A schematic flow chart of a main valve assembly welding method according to an embodiment of the present invention is shown;

[0024] Figure 2 A schematic diagram showing a main valve assembly using the method of the present invention;

[0025] Figure 3 Shown Figure 2 A partial enlarged view of

[0026] Figure 4 Shown Figure 2 Schematic diagram of the main valve body;

[0027] Figure 5 Shown Figure 2 Schematic diagram of the main valve seat.

[0028] The above drawings include the following reference numerals:

[0029] 10. Main valve body; 11. Avoidance hole; 20. Main valve seat; 21. First through hole; 22. Second through hole; 23. Third through hole. DETAILED DESCRIPTION

[0030] The following will clearly and completely describe the technical solutions in the embodiments of the present invention in conjunction with the accompanying drawings in the embodiments of the present invention. Obviously, the described embodiments are only some embodiments of the present invention, not all embodiments. The following description of at least one exemplary embodiment is actually only illustrative and is in no way intended to limit the present invention and its application or use. All other embodiments obtained by ordinary technicians in this field based on the embodiments of the present invention without making any creative efforts are within the scope of protection of the present invention.

[0031] like Figures 1 to 5 As shown, an embodiment of the present invention provides a main valve assembly welding method, the main valve assembly includes a main valve body 10 and a main valve seat 20, the side wall of the main valve body 10 has a long avoidance hole 11, the main valve seat 20 is located in the main valve body 10 and corresponds to the avoidance hole 11, the main valve seat 20 has a first side and a second side relative to each other along the length direction, and between the first side and the second side there are a first through hole 21, a second through hole 22 and a third through hole 23 arranged in sequence along the length direction of the main valve seat 20.

[0032] The main valve assembly welding method includes: dividing the annular weld to be welded into N welding sections along the periphery of the avoidance hole 11 in advance, N ≥ 3, the first side has at least one welding section, and the second side has at least one welding section; welding each welding section, after welding is completed, an annular weld is formed between the main valve body 10 and the main valve seat 20.

[0033] In this solution, the annular weld formed by continuous welding in the main valve assembly of the prior art is divided into at least three sections and distributed on opposite sides of the main valve seat 20. Each welding section is then welded separately to finally form an annular weld. This can avoid continuous heating of the main valve seat 20 during continuous welding, and disperse the heating position of the main valve seat 20 by changing the welding position, thereby reducing the concentration of welding heat in local positions, reducing the welding deformation of the main valve seat 20, and improving product quality.

[0034] Among them, the segmentation points of the N welding segments include at least three of the following four points: point B, located between the first through hole 21 and the second through hole 22, and located on the first side; point D, located between the second through hole 22 and the third through hole 23, and located on the first side; point J, located between the first through hole 21 and the second through hole 22, and located on the second side; point H, located between the second through hole 22 and the third through hole 23, and located on the second side.

[0035] For example, there are three welding segments, the segmentation points are point B, point D and point H, and the three welding segments are segment BD, segment DH and segment HB respectively.

[0036] like Figure 5As shown, the material thickness of the main valve seat 20 at the three through holes is small (that is, the side walls of the through holes are thinner), and the BDJH point is set to avoid the position near the through holes as much as possible, that is, the segmentation point is located at the place where the material thickness of the main valve seat 20 is larger. The main valve seat 20 is not easily deformed during welding, so that the side of the main valve seat 20 with a plane is not easily deformed, which is beneficial to the sealing between the main valve seat 20 and the slider.

[0037] Specifically, the two closest points between the first through hole 21 and the second through hole 22 are the first point and the second point, respectively, and the two closest points between the second through hole 22 and the third through hole 23 are the third point and the fourth point, respectively. In the width direction of the main valve seat 20, the tangent line of the first through hole 21 at the first point is the first tangent line, the tangent line of the second through hole 22 at the second point is the second tangent line, the tangent line of the second through hole 22 at the third point is the third tangent line, and the tangent line of the third through hole 23 at the fourth point is the fourth tangent line. Points B and J are both located between the first and second tangent lines, and points D and H are both located between the third and fourth tangent lines. By defining the above positional relationships, the locations of points BD, J, and H can be avoided from the locations of the through holes, thereby reducing deformation of the main valve seat 20 during welding.

[0038] In order to further reduce welding deformation, N ≥ 4, the segmentation points of the N welding segments include point B, point D, point J and point H, and the N welding segments are welded in the following order: first weld the BD segment and the JH segment, and then weld the other welding segments.

[0039] That is, the welded sections include at least the BD and JH sections, located in the middle of the main valve seat 20, and the BD and JH sections are located on opposite sides of the main valve seat 20. This separate welding on both sides of the main valve seat 20 avoids localized heat concentration caused by continuous welding on the same side. Welding from one end of the main valve seat 20 to the other is not suitable. For example, welding from the L end to the F end is not suitable. If the main valve seat 20 deforms along its length, it may cause the third through hole 23 near the F section to misalign, affecting the installation of subsequent pipes. Furthermore, if the weld length is too long at a time, the main valve seat 20 will experience significant stress and deformation.

[0040] Furthermore, welding the BD and JH sections first, and then welding the other welding sections, is also beneficial for controlling the deformation of the main valve seat 20. During the welding operation, the deformation of the main valve seat 20 can be roughly divided into deformation in the length direction and deformation in the height direction (the axial direction of the through hole). If the deformation in the height direction is large, the plane side of the main valve seat 20 will be uneven, affecting the seal between the main valve seat 20 and the slider. Therefore, it is necessary to avoid deformation in the height direction as much as possible. If the two ends of the main valve seat 20 are welded first during operation, the two ends of the main valve seat 20 will be fixed and difficult to deform in the length direction, which will result in a large height deformation of the main valve seat 20 after welding. Therefore, the middle part of the main valve seat 20 is welded first, so that the two ends of the main valve seat 20 are free sections, and the welding deformation is easy to proceed in the length direction, thereby reducing the deformation in the height direction.

[0041] Furthermore, during welding, the BD and JH sections are welded in the same direction. This prevents welding heat from accumulating at one end of the main valve seat 20, causing significant welding deformation. Welding in different directions, such as welding BD first and then HJ, will cause heat to accumulate between D and H, resulting in significant deformation of the main valve seat 20 during welding.

[0042] Furthermore, after the middle portion of the main valve seat 20 is welded, the other sections are welded from the middle portion of the main valve seat 20 toward the ends of the main valve seat 20. Because the ends of the main valve seat 20 are free ends before welding, the above-mentioned limitation of the welding direction can facilitate welding deformation in the longitudinal direction, thereby reducing deformation in the height direction.

[0043] like Figure 3 As shown, there are at least six welding sections, and the segmentation points of the N welding sections also include: point F, located at the end of the main valve seat 20 and on the side of the third through hole 23 facing away from the first through hole 21; point L, located at the end of the main valve seat 20 and on the side of the first through hole 21 facing away from the third through hole 23. In other words, both ends of the main valve seat 20 have segmentation points. In this way, when welding, it is possible to first weld from the middle of the main valve seat 20 and then weld toward the end of the main valve seat 20, without having to weld from the end of the main valve seat 20 toward the middle of the main valve seat.

[0044] For example, Figure 3 As shown, welding is performed in six sections, with the section points being B, D, F, H, J, and L. The preferred welding order is DB, HJ, DEF, HGF, BAL, and JKL, with each section welded in alphabetical order. Of course, the order in which the DEF, HGF, BAL, and JKL sections are welded can vary.

[0045] In some embodiments, welding can be performed in 8 sections, with the section points being A, B, D, E, G, H, J, and K. The main welding sequence is defined as follows: first weld DB and HJ, then weld DE, HG, BA, and JK; and finally weld EFG and ALK.

[0046] In some embodiments, welding can be performed in 10 sections, with the section points being A, B, C, D, E, G, H, I, J, and K; the main welding sequence is limited to: first weld CB, HI, DC, and IJ, then weld DE, HG, BA, and JK; and finally weld EFG and ALK.

[0047] In this solution, laser welding or argon arc welding is used to weld the main valve body 10 and the main valve seat 20. Laser welding is suitable for small-sized workpieces and has high welding precision.

[0048] In this solution, the main valve seat 20 has a relative plane and arc surface. The first through hole 21, the second through hole 22 and the third through hole 23 all pass through the plane and the arc surface. The arc surface corresponds to the avoidance hole 11, and the welding position of the main valve seat 20 is located on the arc surface.

[0049] This solution also provides a switching valve comprising a main valve assembly, which includes a main valve body 10 and a main valve seat 20. The main valve body 10 and the main valve seat 20 are welded using the aforementioned main valve assembly welding method. This minimizes welding deformation of the main valve assembly, provides excellent sealing when mated with a slider, and improves the performance of the switching valve. The switching valve can be a four-way valve or other similar type of valve.

[0050] The foregoing description is merely a preferred embodiment of the present invention and is not intended to limit the present invention. Those skilled in the art will readily appreciate that various modifications and variations of the present invention are possible. Any modifications, equivalent substitutions, or improvements made within the spirit and principles of the present invention are intended to be within the scope of protection of the present invention.

[0051] It should be noted that the terms used herein are only for describing specific embodiments and are not intended to limit the exemplary embodiments according to the present application. As used herein, unless the context clearly indicates otherwise, the singular form is also intended to include the plural form. In addition, it should be understood that when the terms "comprise" and / or "include" are used in this specification, they indicate the presence of features, steps, operations, devices, components and / or combinations thereof.

[0052] Unless otherwise specifically stated, the relative arrangement of the parts and steps, numerical expressions and numerical values ​​set forth in these embodiments do not limit the scope of the present invention. At the same time, it should be understood that, for ease of description, the sizes of the various parts shown in the accompanying drawings are not drawn according to actual proportional relationships. The technology, methods and equipment known to those of ordinary skill in the relevant art may not be discussed in detail, but in appropriate cases, the technology, methods and equipment should be considered as a part of the specification. In all examples shown and discussed here, any specific value should be interpreted as being merely exemplary, rather than as a limitation. Therefore, other examples of the exemplary embodiments may have different values. It should be noted that similar numbers and letters represent similar items in the following drawings, and therefore, once an item is defined in an accompanying drawing, it does not need to be further discussed in subsequent drawings.

[0053] In the description of the present invention, it should be understood that the directions or positional relationships indicated by directional words such as "front, back, up, down, left, right", "horizontal, vertical, perpendicular, horizontal" and "top, bottom" are usually based on the directions or positional relationships shown in the accompanying drawings. They are only for the convenience of describing the present invention and simplifying the description. Unless otherwise specified, these directional words do not indicate or imply that the device or element referred to must have a specific direction or be constructed and operated in a specific direction. Therefore, they cannot be understood as limiting the scope of protection of the present invention; the directional words "inside and outside" refer to the inside and outside relative to the outline of each component itself.

[0054] For ease of description, spatially relative terms such as "above", "above", "on the upper surface of", "above", etc. may be used herein to describe the spatial positional relationship of a device or feature to other devices or features as shown in the figures. It should be understood that spatially relative terms are intended to include different orientations of the device in use or operation in addition to the orientation described in the figures. For example, if the device in the drawings is inverted, the device described as "above other devices or structures" or "above other devices or structures" will be positioned as "below other devices or structures" or "below other devices or structures". Thus, the exemplary term "above" can include both "above" and "below". The device can also be positioned in other different ways (rotated 90 degrees or in other orientations), and the spatially relative descriptions used here are interpreted accordingly.

[0055] In addition, it should be noted that the use of terms such as "first" and "second" to limit components is only for the convenience of distinguishing the corresponding components. Unless otherwise stated, the above terms have no special meaning and therefore cannot be understood as limiting the scope of protection of the present invention.

Claims

1. A main valve assembly welding method, wherein the main valve assembly comprises a main valve body (10) and a main valve seat (20), wherein a side wall of the main valve body (10) is provided with an elongated avoidance hole (11), wherein the main valve seat (20) is located in the main valve body (10) and corresponds to the avoidance hole (11), wherein the main valve seat (20) has a first side and a second side opposite to each other along a length direction, wherein a first through hole (21), a second through hole (22) and a third through hole (23) are provided between the first side and the second side and are sequentially arranged along the length direction of the main valve seat (20), wherein the main valve assembly comprises a main valve body (10) and a main valve seat (20), wherein the main valve body (10) is provided with a main valve body (10) and a main valve seat (20), wherein the main valve seat (2 ...) The main valve assembly welding method includes: Along the periphery of the avoidance hole (11), the annular weld to be formed by welding is pre-divided into N welding segments, N≥3, the first side has at least one welding segment, and the second side has at least one welding segment; Each welding section is welded, and after welding is completed, the annular weld is formed between the main valve body (10) and the main valve seat (20).

2. The main valve assembly welding method according to claim 1, characterized in that: The segmentation points of the N welding segments include at least three of the following four points: Point B is located between the first through hole (21) and the second through hole (22) and is located on the first side; Point D is located between the second through hole (22) and the third through hole (23) and is located on the first side; Point J is located between the first through hole (21) and the second through hole (22) and is located on the second side; Point H is located between the second through hole (22) and the third through hole (23), and is located on the second side.

3. The main valve assembly welding method according to claim 2, characterized in that: The two points closest to the first through hole (21) and the second through hole (22) are the first point and the second point respectively, and the two points closest to the second through hole (22) and the third through hole (23) are the third point and the fourth point respectively; in the width direction of the main valve seat (20), the tangent of the first through hole (21) at the first point is the first tangent, the tangent of the second through hole (22) at the second point is the second tangent, the tangent of the second through hole (22) at the third point is the third tangent, and the tangent of the third through hole (23) at the fourth point is the fourth tangent; wherein, point B and point J are both located between the first tangent and the second tangent, and point D and point H are both located between the third tangent and the fourth tangent.

4. The main valve assembly welding method according to claim 2, characterized in that: N≥4, the segmentation points of the N welding segments include point B, point D, point J and point H, and the N welding segments are welded in the following order: The BD segment and the JH segment are welded first, and then the other welding segments are welded.

5. The main valve assembly welding method according to claim 4, characterized in that: The welding directions of BD section and JH section are the same.

6. The main valve assembly welding method according to claim 4, characterized in that: When welding the other welding sections, welding is performed from the middle of the main valve seat (20) to the end of the main valve seat (20).

7. The main valve assembly welding method according to claim 4, characterized in that: The N segmentation points of the welding segments also include: Point F is located at the end of the main valve seat (20) and on the side of the third through hole (23) facing away from the first through hole (21); Point L is located at the end of the main valve seat (20) and on the side of the first through hole (21) facing away from the third through hole (23).

8. The main valve assembly welding method according to claim 1, characterized in that: Laser welding or argon arc welding is used for welding.

9. The main valve assembly welding method according to claim 1, characterized in that: The main valve seat (20) has a relative plane and an arc surface, the first through hole (21), the second through hole (22) and the third through hole (23) all pass through the plane and the arc surface, the arc surface corresponds to the avoidance hole (11), and the welding position of the main valve seat (20) is located on the arc surface.

10. A switching valve, characterized in that: The switching valve includes a main valve assembly, and the main valve assembly includes a main valve body (10) and a main valve seat (20). The main valve body (10) and the main valve seat (20) are welded using the main valve assembly welding method described in any one of claims 1 to 9.

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