Ultrasonic welding structure and electric valve

Abstract

The application discloses an ultrasonic welding structure and an electric valve, and the welding structure comprises a first welding piece and a second welding piece, the first welding piece is provided with a welding inner surface (6) and a first welding limiting surface (7), the second welding piece is provided with a welding outer surface (8) and a second welding limiting surface (9), characterized in that the welding inner surface (6) and the welding outer surface (8) are both circumferential straight walls, the inner diameter of the welding inner surface (6) is smaller than the outer diameter of the welding outer surface (8), and a reserved cavity for accommodating overflowed base materials during welding is formed at least at one end of a fusion portion (10) between the welding inner surface (6) and the welding outer surface (8). The ultrasonic welding structure has high welding strength, good sealing performance and low welding cost.

Description

Technical Field

[0001] This invention relates to the field of valve technology, and particularly to an ultrasonic welding structure for electric valves such as electrically operated switching water valves. This invention also relates to electric valves equipped with the aforementioned ultrasonic welding structure. Background Technology

[0002] Ultrasonic welding utilizes high-frequency vibration waves to be transmitted to the surface of the parts to be welded, and applies pressure to the parts, causing the surfaces of the parts to rub against each other to form a fusion between molecular layers. During welding, the weld penetration depth is controlled by controlling the welding pressure or the post-weld height.

[0003] Existing ultrasonic welding structures can be broadly classified into three types: end-face welding structures, groove welding structures, and progressive welding structures.

[0004] Please refer to Figure 1 , Figure 2 , Figure 1 This is a schematic diagram of the end-face welding structure; Figure 2 This is a schematic diagram of a groove-shaped welded structure.

[0005] As shown in the figure, the end-face welding structure has a first weldable part 1′ and a second weldable part 2′. The welding end face of the first weldable part 1′ is a plane, and the welding end face of the second weldable part 2′ is provided with a welding protrusion, which is usually triangular in cross-section. The first weldable part 1′ of the groove welding structure is provided with a groove in the cross-section of the first weldable part 1′, and the second weldable part 2′ is provided with an inverted trapezoidal protrusion that can be embedded in the groove.

[0006] In actual welding processes, end-face welded structures and groove welded structures are prone to gaps or substrate overflow due to factors such as the dimensional tolerances of the parts to be welded. Insufficient welding pressure or small dimensions of the parts to be welded can easily lead to weld gaps of 3′ (see...). Figure 3 , Figure 4 If the pressure is too high or the size of the parts to be welded is too large, it can easily cause the substrate to overflow 4′ (see Figure 5 , Figure 6 The weld gap 3′ and the substrate overflow 4′ not only affect the appearance quality, but also the strength and sealing performance. Moreover, the welding length is affected by the wall thickness and cannot meet the welding airtightness requirements of thin-walled parts.

[0007] Please refer to Figure 7 , Figure 7 This is a schematic diagram of a progressive welding structure.

[0008] As shown in the figure, the progressive welding structure adopts a stepped structure, with the outer end face 5′ used for welding limitation and the inner step 6′ used for fusion. This structure provides a clean post-weld appearance and is less prone to weld gaps and substrate overflow. However, the size of the fusion area 7′ is greatly affected by the wall thickness. When the part wall is thin, the fusion area becomes too small (see figure). Figure 8 , Figure 9 It is prone to defects such as leakage and insufficient strength. Summary of the Invention

[0009] The purpose of this invention is to provide an ultrasonic welding structure with high welding strength and good sealing performance.

[0010] Another object of the present invention is to provide an electric valve having the ultrasonic welding structure described above.

[0011] To achieve the above objectives, the present invention provides an ultrasonic welding structure, including a first weldable component and a second weldable component. The first weldable component has a welding inner surface and a first welding limiting surface, and the second weldable component has both a welding outer surface and a welding limiting surface. The structure is characterized in that the welding inner surface and the welding outer surface are both circumferential straight walls, and the inner diameter of the welding inner surface is smaller than the outer diameter of the welding outer surface. A reserved cavity for accommodating the substrate overflowing during welding is formed at at least one end of the welding inner surface and the welding outer surface.

[0012] The ultrasonic welding structure provided by this invention has a reserved cavity at one or both ends of the fusion joint. The reserved cavity can accommodate the substrate that overflows during welding, preventing the overflowed substrate from flowing to the outside of the product, thereby effectively ensuring the appearance quality. Moreover, both the inner and outer surfaces of the weld are circumferential straight walls. The length of the fusion joint formed after welding can be increased or decreased according to the actual needs of the product, without being limited by the wall thickness of the parts. The post-weld dimensions are controlled by the part structure and are less affected by the welding process. The post-weld dimensional accuracy is high, the welding process is stable, the weld quality is high, and the welding cost is relatively low.

[0013] The electric valve provided by this invention is equipped with the ultrasonic welding structure. Since the ultrasonic welding structure has the above-mentioned technical effects, the electric valve equipped with the ultrasonic welding structure should also have the corresponding technical effects. Attached Figure Description

[0014] Figure 1 This is a schematic diagram of the end-face welding structure;

[0015] Figure 2 This is a schematic diagram of a groove-shaped welded structure;

[0016] Figure 3 A schematic diagram of a welded structure with gaps in the end face welding structure;

[0017] Figure 4 for Figure 3 A magnified view of part A in the middle;

[0018] Figure 5 A schematic diagram of a structure that causes substrate overflow due to a groove-shaped welding structure;

[0019] Figure 6 for Figure 5 A magnified view of part B in the middle;

[0020] Figure 7 This is a schematic diagram of a progressive welding structure.

[0021] Figure 8 A schematic diagram of a progressive welding structure with an excessively small welding area;

[0022] Figure 9 for Figure 8 A magnified view of part C in the middle;

[0023] Figure 10 This is a schematic diagram of the structure of an electrically operated switching water valve disclosed in an embodiment of the present invention;

[0024] Figure 11 for Figure 10 A magnified view of part D in the middle.

[0025] Figures 1 to 9 middle:

[0026] First component to be welded 1′ Second component to be welded 2′ Weld gap 3′ Substrate overflow 4′ Outer end face 5′ Internal step 6′ Welding area 7′

[0027] Figure 10 , 11 middle:

[0028] 1. Valve body 2. Valve core ball 3. Sealing gasket 4. O-ring 5. Valve seat 6. Welded inner surface 7. First welded limiting surface 8. Welded outer surface 9. Second welded limiting surface 10. Welding area 11. First reserved cavity 12. Second reserved cavity 13. First welding guide cone surface 14. Second welding guide cone surface 15. Drive device 16. Valve stem Detailed Implementation

[0029] To enable those skilled in the art to better understand the present invention, the present invention will be further described in detail below with reference to the accompanying drawings and specific embodiments.

[0030] In this document, terms such as "upper," "lower," "left," and "right" are established based on the positional relationships shown in the accompanying drawings. Depending on the drawings, the corresponding positional relationships may change. Therefore, they should not be interpreted as an absolute limitation on the scope of protection. Moreover, relational terms such as "first" and "second" are only used to distinguish one component from another that has the same name, and do not necessarily require or imply any such actual relationship or order between these components.

[0031] Please refer to Figure 10 , Figure 11 , Figure 10 This is a schematic diagram of the structure of an electrically operated switching water valve disclosed in an embodiment of the present invention; Figure 11 for Figure 10 A magnified view of part D in the middle.

[0032] As shown in the figure, in one specific embodiment, taking the valve body of an electrically operated water switching valve as an example, the ultrasonic welding structure provided by the present invention will be described.

[0033] The valve body 1 of the electric switching water valve has an integrally formed pipe joint on the left end and a port with a larger diameter on the right end. After the valve core ball 2, sealing gasket 3, O-ring 4 and other components are installed into the valve body 1 from the port, they are pressed and limited by the valve seat 5 in the axial direction. The tail of the valve seat 5 forms the pipe joint at the other end. The valve seat 5 and the valve body 1 can be connected by threads. In this embodiment, the valve seat 5 and the valve body 1 are designed with an ultrasonic welding structure, and the two are connected by the ultrasonic welding structure.

[0034] Specifically, the valve body 1 itself forms the first part to be welded, the valve seat 5 forms the second part to be welded, the inner surface of the port at the right end of the valve body 1 is designed as a welding inner surface 6 for welding, and the end face of the port forms the first welding limiting surface 7. The valve seat 5 has a sleeve portion for inserting into the right end port of the valve body 1. The circumferential outer surface of the sleeve portion is designed as a welding outer surface 8 for welding. The root of the sleeve portion has a flange, and the side of this flange opposite to the first welding limiting surface 7 forms the second welding limiting surface 9.

[0035] The welded portion 10 formed by the welding of valve body 1 and valve seat 5 is cylindrical. Since both the inner welded surface 6 and the outer welded surface 8 are circumferential straight walls, the length of the welded portion 10 can be increased or decreased according to the actual needs of the product, without being limited by the wall thickness of the parts. Furthermore, the inner diameter of the inner welded surface 6 is smaller than the outer diameter of the outer welded surface 8. The difference between the inner diameter of the inner welded surface 6 and the outer diameter of the outer welded surface 8 is the interference fit between them. The interference fit between the inner welded surface 6 and the outer welded surface 8 is consistent, which can ensure a stable welding process and obtain a high weld quality.

[0036] A reserved cavity is formed at both ends of the fusion portion 10 between the inner welding surface 6 and the outer welding surface 8. The reserved cavity includes a first reserved cavity 11 and a second reserved cavity 12. The first reserved cavity 11 is located at the end of the fusion portion 10 that is close to the first welding limiting surface 7 and the second welding limiting surface 9. The second reserved cavity 12 is located at the end of the fusion portion 10 that is far away from the first welding limiting surface 7 and the second welding limiting surface 9.

[0037] The first reserved cavity 11 is mainly formed by the outward expansion portion formed after part of the material is cut off from the welded inner surface 6 in the circumferential direction. In other words, this outward expansion portion together with part of the welded outer surface 8 forms a cylindrical cavity that surrounds the entire perimeter. The second reserved cavity 12 is mainly formed by the inward contraction portion formed after part of the material is cut off from the welded outer surface 8 in the circumferential direction. In other words, this inward contraction portion together with part of the welded inner surface 6 forms a cylindrical cavity that surrounds the entire perimeter.

[0038] During welding, a portion of the substrate overflows into the first reserved cavity 11, and another portion enters the second reserved cavity 12. That is, the first reserved cavity 11 and the second reserved cavity 12 are used to accommodate the substrate overflowing during welding, so that the overflowing substrate will not flow to the outside of the product, thereby effectively ensuring the appearance quality.

[0039] Of course, in some other embodiments, an inward portion may also be formed on the outer surface 8 of the weld, so that the first reserved cavity 11 is formed by the outward expansion portion on the inner surface 6 of the weld and the inward portion on the outer surface 8 of the weld together; or an outward expansion portion may be formed on the inner surface 6 of the weld, so that the second reserved cavity 12 is formed by the inward expansion portion on the outer surface 8 of the weld and the outward expansion portion on the inner surface 6 of the weld together.

[0040] Furthermore, the welding contact ends of the inner welding surface 6 and the outer welding surface 8 are respectively provided with a first welding guide cone surface 13 and a second welding guide cone surface 14. The welding guide cone surfaces of the inner welding surface 6 and the outer welding surface 8 are in contact at the beginning of welding, the first welding limiting surface 7 and the second welding limiting surface 9 are not in contact at the beginning of welding, the welding guide cone surfaces of the inner welding surface 6 and the outer welding surface 8 are axially misaligned when welding is completed, and the first welding limiting surface 7 and the second welding limiting surface 9 are in contact when welding is near completion.

[0041] Through the first welding guide cone 13 and the second welding guide cone 14, automatic centering and alignment can be effectively performed during welding, which can effectively ensure the dimensional and positional tolerances of the welded parts.

[0042] During welding, the first welding guide cone surface 13 of the valve body and the second welding guide cone surface 14 of the valve seat first come into contact and play a certain role in centering and alignment. Subsequently, the inner and outer welding surfaces of the two are slowly melted under the action of ultrasonic waves. The melted substrate enters the first reserved cavity 11 and the second reserved cavity 12 under the action of welding machine pressure until the first welding limiting surface 7 and the second welding limiting surface 9 are tightly fitted together, and the welding is completed.

[0043] At the start of welding, only the first welding guide cone surface 13 and the second welding guide cone surface 14 of the valve body 1 and valve seat 5 are in contact. At this time, the contact area is small, the ultrasonic energy is relatively concentrated, and the welding part can be melted quickly. When the welding is nearing completion, the first welding limiting surface 7 of the valve body 1 and the second welding limiting surface 9 of the valve seat 5 come into contact with each other, which increases the contact area and disperses the ultrasonic energy, making it impossible to continue melting the parts to be welded. At this time, the parts have also reached the designed welding height. The post-weld dimensions are controlled by the part structure and are less affected by the welding process, resulting in high post-weld dimensional accuracy.

[0044] The above embodiments are merely preferred embodiments of the present invention and are not limited thereto. Based on these, targeted adjustments can be made according to actual needs to obtain different implementation methods. For example, a cavity may be reserved only at one end of the welding portion 10. This cavity may be located at one end of the welding portion 10 near the first welding limiting surface 7 and the second welding limiting surface 9, or at one end away from the first welding limiting surface 7 and the second welding limiting surface 9. Alternatively, the first reserved cavity 11 may be mainly composed of an inwardly recessed portion formed by cutting away a portion of material from the outer welding surface 8 in the circumferential direction, and the second reserved cavity 12 may be mainly composed of an outwardly expanded portion formed by cutting away a portion of material from the inner welding surface 6 in the circumferential direction, and so on. Since there are many possible implementation methods, they will not be listed here.

[0045] The ultrasonic welding structure has a reserved cavity at one or both ends of the welding part 10. The reserved cavity can accommodate the substrate that overflows during welding, preventing the overflowed substrate from flowing to the outside of the product, thus effectively ensuring the appearance quality. Moreover, both the inner welding surface 6 and the outer welding surface 8 are circumferential straight walls. The length of the welding part formed after welding can be increased or decreased according to the actual needs of the product, without being limited by the wall thickness of the parts. The post-weld dimensions are controlled by the part structure and are less affected by the welding process. The post-weld dimensional accuracy is high, the welding process is stable, the weld quality is high, and the welding cost is relatively low.

[0046] In addition to the ultrasonic welding structure described above, the present invention also provides an electric switching water valve, which is mainly assembled from components such as valve body 1, valve core ball 2, sealing gasket 3, O-ring 4, valve seat 5 and drive device 15. The valve core ball 2 is installed inside the valve body 1, and sealing gasket 3 and O-ring 4 are respectively provided on both sides. The sealing gasket 3 is used to cooperate with the valve core ball 2, and the O-ring 4 is used to seal the back of the sealing gasket 3. The valve core ball 2 is connected to the drive device 15 located on the upper part of the valve body 1 through the valve stem 16.

[0047] During operation, the drive device 15 is energized to generate a rotational torque, which drives the valve core ball 2 to rotate via the valve stem 16. When the valve core ball 2 deflects at a certain angle, it becomes misaligned with the outlet end of the valve body 1, thereby creating a throttling effect. The flow rate of the medium passing through the product is adjusted by controlling the magnitude of the throttling at this point. When the valve core ball 2 is completely misaligned with the outlet end of the valve body 1, the product is in the closed state.

[0048] The O-ring 4 has a certain preload, which keeps the valve core ball 2 and the sealing gasket 3, and the sealing gasket 3 and the O-ring 4 in a sealed state. The final welding height of the product directly affects the magnitude of this preload and plays a key role in the final sealing performance of the product. After adopting the ultrasonic welding structure described above, this design objective can be guaranteed to be achieved.

[0049] For details regarding the remaining structure of the electrically operated water switching valve, please refer to existing technologies; these details will not be elaborated upon here.

[0050] The ultrasonic welding structure and electric valve provided by this invention have been described in detail above. Specific examples have been used to illustrate the principles and implementation methods of this invention. The descriptions of the embodiments above are only for the purpose of helping to understand the core ideas of this invention. It should be noted that those skilled in the art can make various improvements and modifications to this invention without departing from the principles of this invention, and these improvements and modifications also fall within the protection scope of the claims of this invention.

Claims

1. An electric valve, comprising a valve body (1), a valve core ball (2), a sealing gasket (3), an O-ring (4), a valve seat (5), and a drive device (15), wherein the valve core ball (2) is installed inside the valve body (1), and a sealing gasket (3) and an O-ring (4) are respectively provided on both sides thereon, the sealing gasket (3) is used to cooperate with the valve core ball (2), and the O-ring (4) is used to seal the back of the sealing gasket (3), the valve core ball (2) is connected to the drive device (15) located on the upper part of the valve body (1) via a valve stem (16), characterized in that, The valve body has a welded inner surface (6) and a first welded limiting surface (7), and the valve seat has a welded outer surface (8) and a second welded limiting surface (9). The valve body is characterized in that the welded inner surface (6) and the welded outer surface (8) are both circumferential straight walls, and the inner diameter of the welded inner surface (6) is smaller than the outer diameter of the welded outer surface (8). A reserved cavity for accommodating the substrate overflowing during welding is formed at at least one end of the welded inner surface (6) and the welded outer surface (8) at the fusion part (10). The difference between the inner diameter of the inner surface (6) and the outer diameter of the outer surface (8) is the interference between them, and the interference between the inner surface (6) and the outer surface (8) is consistent in the direction of welding pressure. The reserved cavity includes a first reserved cavity (11) and a second reserved cavity (12); the first reserved cavity (11) is located at one end of the fusion portion (10) close to the first welding limiting surface (7) and the second welding limiting surface (9), and the second reserved cavity (12) is located at one end of the fusion portion (10) away from the first welding limiting surface (7) and the second welding limiting surface (9); The first reserved cavity (11) and the second reserved cavity (12) are respectively formed by the outward expansion portion of the inner welding surface (6) and / or the inward contraction portion of the outer welding surface (8); The welding contact ends of the inner welding surface (6) and the outer welding surface (8) are respectively provided with welding guide cone surfaces.

2. The electric valve according to claim 1, characterized in that, A portion of the substrate that overflows during welding enters the first reserved cavity (11), and another portion enters the second reserved cavity (12).

3. The electric valve according to claim 1, characterized in that, The welding guide cone surfaces of the inner welding surface (6) and the outer welding surface (8) are in contact at the start of welding, while the first welding limiting surface (7) and the second welding limiting surface (9) are not in contact at the start of welding; the welding guide cone surfaces of the inner welding surface (6) and the outer welding surface (8) are axially misaligned when welding is completed, while the first welding limiting surface (7) and the second welding limiting surface (9) are in contact when welding is near completion.

4. The electric valve according to claim 1, characterized in that, The welded portion (10) is cylindrical in shape.

Images