Welded structure and pump device having same
By designing grooves and protrusions in the welded structure of the pump unit to abut against each other and create gaps between the outer and inner walls, the problems of positional accuracy and burr ejection during ultrasonic welding are solved, achieving higher welding reliability and stability.
Patent Information
- Application Number
- CN202520538389.9
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2025-03-25
- Publication Date
- 2026-02-10
- Estimated Expiration
- 2035-03-25
AI Technical Summary
In existing pump devices, the gap between the protrusion and the groove during ultrasonic welding makes it impossible to meet the relative positional accuracy, and burrs are prone to flying out.
Design a welding structure in which grooves have opposing sidewalls and protrusions have opposing outer walls, ensuring the relative positional accuracy of the welded parts by abutting and forming gaps at specific locations, and utilizing the gaps to accommodate burrs.
It improves the relative positional accuracy of the welded parts, prevents burrs from flying out, and enhances the reliability and stability of the welding.
Smart Images
Figure CN223894351U_ABST
Abstract
Description
Technical Field
[0001] This utility model relates to a welded structure and a pump device having the welded structure. Background Technology
[0002] Conventionally, there is a pump device having a housing. The housing has a cylindrical portion and a cover, the cover covering one axial end of the cylindrical portion. A groove is formed on the axial end of the cylindrical portion, and a protrusion is formed on the axial end of the cover. The protrusion is inserted into the groove, and its front end is ultrasonically welded to the bottom surface of the groove.
[0003] However, in the pump device described above, gaps are usually provided on both sides of the protrusion within the groove. Therefore, during ultrasonic welding, depending on the movement of the protrusion within the groove in a direction intersecting the insertion direction, the cylinder and cover may not meet the required relative positional accuracy after welding, and burrs within the groove may fly outwards. Utility Model Content
[0004] This invention was made in view of the above-mentioned problems, and its purpose is to provide a welding structure and pump device that helps to ensure that the two components meet the required relative positional accuracy after welding and to suppress the flying of burrs.
[0005] To achieve the above objectives, this utility model provides a welding structure, including a first component and a second component. The first component has a groove, and the second component has a protrusion. The protrusion is inserted into the groove, and its front end is joined to the bottom surface of the groove by ultrasonic welding. The groove has a first inner wall and a second inner wall that serve as opposing sidewalls. The protrusion has a first outer wall opposite to the first inner wall and a second outer wall opposite to the second inner wall. The first outer wall abuts against the first inner wall at a first position, and a gap is formed between the first outer wall and the first inner wall at a position closer to the bottom surface than the first position. And / or, the second outer wall abuts against the second inner wall at a second position, and a gap is formed between the second outer wall and the second inner wall at a position closer to the bottom surface than the second position.
[0006] According to the welding structure of this utility model, the groove has a first inner wall and a second inner wall that are opposite to each other as sidewalls, and the protrusion has a first outer wall opposite to the first inner wall and a second outer wall opposite to the second inner wall. The first outer wall abuts against the first inner wall at a first position, and a gap is formed between the first outer wall and the first inner wall at a position closer to the bottom surface than the first position; and / or, the second outer wall abuts against the second inner wall at a second position, and a gap is formed between the second outer wall and the second inner wall at a position closer to the bottom surface than the second position. Therefore, during ultrasonic welding, the relative positional accuracy of the first component and the second component after welding can be ensured by the first outer wall abutting against the first inner wall at the first position and the second outer wall abutting against the second inner wall at the second position. Furthermore, the gaps formed between the first outer wall and the first inner wall and the gaps formed between the second outer wall and the second inner wall can be used to accommodate burrs and prevent burrs from flying outward.
[0007] Furthermore, in the welding structure of this utility model, it is preferable that the first outer wall forms a surface contact with the first inner wall in a first region from the first position to a position farther away from the bottom surface than the first position, and / or that the second outer wall forms a surface contact with the second inner wall in a second region from the second position to a position farther away from the bottom surface than the second position.
[0008] According to the welding structure of this utility model, the first outer wall forms a surface contact with the first inner wall in a first region from the first position to a position farther from the bottom surface than the first position, and / or the second outer wall forms a surface contact with the second inner wall in a second region from the second position to a position farther from the bottom surface than the second position. Therefore, during ultrasonic welding, the surface contact between the first outer wall and the first inner wall, and the surface contact between the second outer wall and the second inner wall, can more reliably ensure the relative positional accuracy of the first component and the second component after welding.
[0009] Furthermore, in the welding structure of this utility model, preferably the first outer wall has a first separation surface and a first contact surface. The first separation surface extends from the first position toward the bottom surface toward the second inner wall side and is spaced apart from the first inner wall. The first contact surface extends from the first separation surface in a bent direction away from the bottom surface and forms a surface contact with the first inner wall in the first region. And / or, the second outer wall has a second separation surface and a second contact surface. The second separation surface extends from the second position toward the bottom surface toward the first inner wall side and is spaced apart from the second inner wall. The second contact surface extends from the second separation surface in a bent direction away from the bottom surface and forms a surface contact with the second inner wall in the second region.
[0010] Furthermore, in the welding structure of this utility model, preferably the first outer wall has a first contact surface and a first separation surface, the first contact surface is inclined relative to the bottom surface and forms a surface contact with the first inner wall in the first region, the first separation surface extends from the first contact surface in a bent manner toward the bottom surface and is spaced apart from the first inner wall, and / or the second outer wall has a second contact surface and a second separation surface, the second contact surface is inclined relative to the bottom surface and forms a surface contact with the second inner wall in the second region, the second separation surface extends from the second contact surface in a bent manner toward the bottom surface and is spaced apart from the second inner wall.
[0011] Furthermore, in the welding structure of this utility model, it is preferable that the first separation surface is perpendicular to the bottom surface, and / or that the second separation surface is perpendicular to the bottom surface.
[0012] Furthermore, in the welding structure of this utility model, it is preferable that the first inner wall is perpendicularly connected to the bottom surface, and / or that the second inner wall is perpendicularly connected to the bottom surface.
[0013] According to the welding structure of this utility model, especially when the first outer wall forms a surface contact with the first inner wall in a first region from the first position to a position farther from the bottom surface than the first position, and the second outer wall forms a surface contact with the second inner wall in a second region from the second position to a position farther from the bottom surface than the second position, the surface contact between the first outer wall and the first inner wall and the surface contact between the second outer wall and the second inner wall can be formed earlier during ultrasonic welding, thereby more reliably ensuring the relative positional accuracy of the first component and the second component after welding.
[0014] Furthermore, in the welding structure of this utility model, it is preferable that the first component and the second component are both made of resin.
[0015] In addition, in order to achieve the above objectives, the present invention provides a pump device having any of the above-mentioned welded structures.
[0016] Furthermore, in the pump device of this utility model, it is preferable to have a housing having: a cylindrical portion constituting one of the first component and the second component; and a cover constituting the other of the first component and the second component and covering one axial end of the cylindrical portion.
[0017] Furthermore, in the pump device of this utility model, it is preferable to have an impeller, which has: a base plate constituting one of the first component and the second component; and blades constituting the other of the first component and the second component.
[0018] (Utility Model Effect)
[0019] According to this utility model, the groove has a first inner wall and a second inner wall that are opposite to each other as sidewalls, and the protrusion has a first outer wall opposite to the first inner wall and a second outer wall opposite to the second inner wall. The first outer wall abuts against the first inner wall at a first position, and a gap is formed between the first outer wall and the first inner wall at a position closer to the bottom surface than the first position; and / or, the second outer wall abuts against the second inner wall at a second position, and a gap is formed between the second outer wall and the second inner wall at a position closer to the bottom surface than the second position. Therefore, during ultrasonic welding, the relative positional accuracy of the first component and the second component after welding can be ensured by the first outer wall abutting against the first inner wall at the first position and the second outer wall abutting against the second inner wall at the second position. Furthermore, the gaps formed between the first outer wall and the first inner wall and the gaps formed between the second outer wall and the second inner wall can be used to accommodate burrs and prevent burrs from flying outward. Attached Figure Description
[0020] Figure 1 This is a perspective view schematically illustrating a pump device according to an embodiment of the present invention.
[0021] Figure 2 This is a partial exploded view schematically illustrating an embodiment of the pump device of this utility model.
[0022] Figure 3 This is a perspective view schematically showing the cover in the pump device according to an embodiment of the present invention.
[0023] Figure 4 This is a side sectional view schematically illustrating an embodiment of the pump device of this utility model.
[0024] Figure 5 This is a partial side sectional view schematically showing the structure near the cover of the pump device according to an embodiment of the present invention.
[0025] Figure 6A , Figure 6B and Figure 6C This is a side sectional view schematically illustrating the welding process between the cover and the cylinder in the pump device according to an embodiment of the present invention.
[0026] Figure 7 This is a partial side sectional view schematically illustrating the structure of the impeller and rotor in the pump device according to an embodiment of the present invention.
[0027] Figure 8A , Figure 8B and Figure 8C This is a side sectional view schematically illustrating the welding process of the impeller base plate and blades in the pump device according to an embodiment of the present invention.
[0028] (Symbol Explanation)
[0029] 1. Pump unit
[0030] 10. Shell
[0031] 11. Cylinder section
[0032] 12 lids
[0033] 13 Pump casing
[0034] 131 Fluid suction tube
[0035] 132 Fluid discharge pipe
[0036] 14. Divider
[0037] 20 Impeller
[0038] 21 Base Plate
[0039] 22 blades
[0040] 23 Top Slab
[0041] 30 stators
[0042] 40 rotors
[0043] 50 Control board
[0044] GV1 Groove
[0045] GV11 First Inner Wall
[0046] GV12 Second Inner Wall
[0047] GV2 Groove
[0048] GV21 First Inner Wall
[0049] GV22 Second Inner Wall
[0050] BS1 protrusion
[0051] BS11 First Outer Wall
[0052] BS12 Second Outer Wall
[0053] BS121 Second Separation Surface
[0054] BS122 Second Contact Surface
[0055] BS2 protrusion
[0056] BS21 First Outer Wall
[0057] BS211 First Contact Surface
[0058] BS212 First Separation Surface
[0059] BS22 Second Outer Wall
[0060] BS221 Second Contact Surface
[0061] BS222 Second Separation Surface
[0062] P2 Second Position
[0063] P3 Third Position
[0064] P4 Fourth Position
[0065] AR2 Second Area
[0066] AR3 Third Area
[0067] AR4 Fourth Area Detailed Implementation
[0068] Below, in conjunction with Figure 1 value Figure 8C The pump device according to the embodiments of this utility model will be described.
[0069] For ease of explanation, the direction of the impeller's rotation centerline, i.e., the axial direction, will be simply referred to as "axial direction," and the radial and circumferential directions centered on the impeller's rotation centerline will be simply referred to as "radial" and "circumferential" respectively. Furthermore, the axial direction will be designated as L, one side along the axial direction will be designated as L1, and the other side along the axial direction will be designated as L2.
[0070] (Overall structure of the pump unit)
[0071] like Figure 1 , Figure 2 and Figure 4 As shown, the pump assembly 1 has a housing 10. The housing 10 has a cylindrical portion 11 and a cover 12, which covers one end of the cylindrical portion 11 along the axial direction L1. The cylindrical portion 11 and the cover 12 are joined together by ultrasonic welding.
[0072] Here, as Figure 3 As shown, the pump assembly 1 also has an impeller 20. The impeller 20 is housed in the casing 10. The impeller 20 has a base plate 21 and blades 22, which are also joined together by ultrasonic welding.
[0073] In addition, such as Figure 3 As shown, the pump assembly 1 also has a stator 30 and a rotor 40. The stator 30 and rotor 40 are housed in the housing 10. The rotor 40 rotates about the rotation center line of the impeller 20 relative to the stator 30 and is connected to the impeller 20.
[0074] In addition, such as Figure 2 and Figure 4As shown, the pump unit 1 also has a control board 50. The control board 50 is housed in the housing 10. The control board 50 is electrically connected to the stator 30 (specifically the stator coil) and controls the movement of the rotor 40.
[0075] (Structure of the shell)
[0076] As described above, the housing 10 has a cylindrical portion 11 and a cover 12.
[0077] Here, as Figure 1 , Figure 2 and Figure 4 As shown, the housing 10 also has a pump housing 13. The pump housing 13 covers the end of the other side L2 of the cylindrical portion 11 in the axial direction L, and is integrally formed with a fluid suction pipe 131 and a fluid discharge pipe 132.
[0078] In addition, the cylinder 11, cover 12 and pump housing 13 are made of resin, for example.
[0079] In addition, such as Figure 3 As shown, a partition 14 is integrally formed at one end of the cylindrical portion 11 along the axial direction L on one side L1, and the partition 14 closes the opening on one side L1 of the cylindrical portion 11 along the axial direction L. Thus, the cylindrical portion 11, the cover 12, and the partition 14 form a storage chamber, in which the control board 50 is stored. Furthermore, the cylindrical portion 11, the pump housing 13, and the partition 14 form a pump chamber, in which the impeller 20 and the rotor 40 are stored.
[0080] In addition, such as Figure 2 and Figure 5 As shown, a groove GV1 is formed at the end of one side L1 along the axial direction L of the cylindrical portion 11. The groove GV1 has a first inner wall GV11 and a second inner wall GV12 that serve as opposing sidewalls. Specifically, the groove GV1 is continuously formed in the circumferential direction, that is, the first inner wall GV11 and the second inner wall GV12 are continuously formed in the circumferential direction. The second inner wall GV12 is radially outward than the first inner wall GV11. Furthermore, the first inner wall GV11 and the second inner wall GV12 extend along the axial direction L, and the bottom surface of the groove GV1 extends in a direction orthogonal to the axial direction L.
[0081] In addition, such as Figure 2 , Figure 3 and Figure 5As shown, a protrusion BS1 is formed at the end of the other side L2 along the axial direction L of the cover 12. The protrusion BS1 is inserted into the groove GV1, and its front end (the end of the other side L2 along the axial direction L) is ultrasonically welded to the bottom surface of the groove GV1. The protrusion BS1 has a first outer wall BS11 opposite to the first inner wall GV11 and a second outer wall BS12 opposite to the second inner wall GV12. The first outer wall BS11 is separate from the first inner wall GV11 (i.e., not in contact). The second outer wall BS12 abuts against the second inner wall GV12 at a second position P2, and a gap is formed between the second outer wall BS12 and the second inner wall GV12 at a position closer to the bottom surface of the groove GV1 than the second position P2. Specifically, the protrusion BS1 is continuously formed in the entire circumferential direction, that is, the first outer wall BS11 and the second outer wall BS12 are continuously formed in the entire circumferential direction. The second outer wall BS12 is radially outward than the first outer wall BS11. Furthermore, the second outer wall GV12 forms surface contact with the second inner wall GV12 in a second region AR2 extending from the second position P2 to a position further away from the bottom surface of the groove GV1 than the second position P2 (in the illustrated example, this is a contact surface extending throughout the entire circumference). More specifically, as... Figure 6A , Figure 6B and Figure 6C As shown, the second outer wall BS12 has a second separating surface BS121 and a second contact surface BS122. The second separating surface BS121 (which can be a plane or a curved surface) extends from the second position P2 toward the bottom surface of the groove GV towards the side of the first inner wall GV11 and is spaced apart from the second inner wall GV12. The second contact surface BS122 extends from the second separating surface BS121 in a bent direction away from the bottom surface of the groove GV1 and forms a surface contact with the second inner wall GV12 within the second region AR2. The second outer wall BS12 of the protrusion BS1, the second inner wall GV12 of the groove GV1, and the bottom surface form a closed space for burr collection.
[0082] In addition, such as Figure 6A As shown, before ultrasonic welding, the cross-section of the front end of the protrusion BS1 (the cross-section obtained by cutting along the axial direction L) is approximately conical. Figure 6B and Figure 6C As shown, as ultrasonic welding proceeds, the tapered portion at the front end of the protrusion BS1 inserts into the bottom surface of the groove GV1, and the two melt together and join together.
[0083] In addition, such as Figure 4 As shown, a groove is also formed at the end of the other side L2 of the cylindrical part 11 along the axial L, and a protrusion is also formed at the end of one side L1 of the pump housing 13 along the axial L. The protrusion is inserted into the groove, and the front end (the end of one side L1 along the axial L) is joined to the bottom surface of the groove by ultrasonic welding.
[0084] (Structure of the impeller)
[0085] like Figure 4 and Figure 7 As shown, the impeller 20 has a base plate 21 and blades 22.
[0086] Here, as Figure 4 and Figure 7 As shown, the impeller 20 also has a top plate 23. The top plate 23 is spaced apart from the bottom plate 21 on the other side L2 in the axial direction L. The blade 22 is integrally formed with the top plate 23 and extends from the top plate 23 to the bottom plate 21 on the side L1 in the axial direction L.
[0087] In addition, the base plate 21, blades 22 and top plate 23 are made of resin, for example.
[0088] In addition, such as Figure 4 , Figure 7 , Figure 8B and Figure 8C As shown, the base plate 21 is connected to the rotor 40. The base plate 21 extends in a direction orthogonal to the axial direction L, centered on the rotation centerline of the impeller 20. A groove GV2 is formed on one end face L1 of the base plate 21 along the axial direction L. The groove GV2 has a first inner wall GV21 and a second inner wall GV22 serving as opposing sidewalls. Specifically, the groove GV2 bends and extends from the rotation centerline side of the impeller 20 toward the outer periphery, that is, the first inner wall GV21 and the second inner wall GV22 bend and extend from the rotation centerline side of the impeller 20 toward the outer periphery, respectively. The extension direction of the groove GV2 is closed at both ends. The second inner wall GV22 is radially outward compared to the first inner wall GV21. Furthermore, the portions of the first inner wall GV21 and the second inner wall GV22 near the bottom surface of the groove GV2 extend along the axial direction L, and the portions of the first inner wall GV21 and the second inner wall GV22 near the opening of the groove GV2 extend obliquely relative to the axial direction L, and the bottom surface of the groove GV2 extends in a direction orthogonal to the axial direction L.
[0089] In addition, such as Figure 7 As shown, multiple blades 22 are formed at intervals in the circumferential direction. The blades 22 extend curvedly from the rotation center line side of the impeller 20 towards the outer periphery. A protrusion BS2 is formed at the end of one side L1 along the axial direction L of the blade 22. The protrusion BS2 is inserted into the groove GV2, and its front end (the end of one side L1 along the axial direction L) is ultrasonically welded to the bottom surface of the groove GV2. The protrusion BS2 has a first outer wall BS21 opposite to the first inner wall GV21 and a second outer wall BS22 opposite to the second inner wall GV22. Figure 8CAs shown, the first outer wall BS21 abuts against the first inner wall GV21 at a third position P3, and a gap is formed between the first outer wall BS21 and the first inner wall GV21 at a position closer to the bottom surface of the groove GV2 than the third position P3. The second outer wall BS22 abuts against the second inner wall GV22 at a fourth position P4, and a gap is formed between the second outer wall BS22 and the second inner wall GV22 at a position closer to the bottom surface of the groove GV2 than the fourth position P4. Specifically, the protrusion BS2 bends and extends from the rotation center line side of the impeller 20 toward the outer periphery, that is, the first outer wall BS21 and the second outer wall BS22 bend and extend from the rotation center line side of the impeller 20 toward the outer periphery, respectively. The second outer wall BS22 is radially outward than the first outer wall BS21. Furthermore, the first outer wall GV21 forms surface contact with the first inner wall GV21 in a third region AR3 from the third position P3 to a position further away from the bottom surface of the groove GV2 than the third position P3. The second outer wall GV22 forms surface contact with the second inner wall GV22 in a fourth region AR4, extending from the fourth position P4 to a position further away from the bottom surface of the groove GV2 than the fourth position P4. More specifically, the first outer wall BS21 has a first contact surface BS211 and a first separation surface BS212. The first contact surface BS211 is inclined relative to the bottom surface of the groove GV2 and forms surface contact with the first inner wall GV21 in a third region AR3. The first separation surface BS212 (which may be planar or curved) extends from the first contact surface BS211 toward the bottom surface of the groove GV2 (in the illustrated example, the first separation surface BS212 extends along the axial direction L, i.e., the first separation surface BS212 is perpendicular to the bottom surface of the groove GV2, but is not limited to this). The second outer wall BS22 has a second contact surface BS221 and a second separation surface BS222. The second contact surface BS221 is inclined relative to the bottom surface of the groove GV2 and forms surface contact with the second inner wall GV22 within the fourth region AR4. The second separation surface BS222 (which can be a plane or a curved surface) extends from the second contact surface BS221 toward the bottom surface of the groove GV2 in a bent manner (in the illustrated example, the second separation surface BS222 extends along the axial direction L, i.e., the second separation surface BS222 is perpendicular to the bottom surface of the groove GV2, but is not limited to this). The first outer wall BS21 of the protrusion BS2, the groove GV2, the second outer wall BS12 of the protrusion BS2, and the groove GV2 respectively form a closed space for burr collection.
[0090] In addition, such as Figure 8A As shown, before ultrasonic welding, the cross-section of the front end of the protrusion BS2 (the cross-section obtained by cutting along the axial direction L) is approximately conical. A stepped surface parallel to the bottom surface of the groove GV2 is formed between the conical portion of the front end of the protrusion BS2 and the first separation surface BS212 and the second separation surface BS222. Figure 8B and Figure 8CAs shown, as ultrasonic welding proceeds, the tapered portion at the front end of the protrusion BS2 is inserted into the bottom surface of the groove GV2, and the two melt together and join together. The stepped surface at the front end of the protrusion BS2 forms a surface contact with the bottom surface of the groove GV2.
[0091] (Main effects of this implementation method)
[0092] According to the pump device 1 of this embodiment, the groove GV1 has a first inner wall GV11 and a second inner wall GV12 as sidewalls facing each other, and the protrusion BS1 has a first outer wall BS11 facing the first inner wall GV11 and a second outer wall BS12 facing the second inner wall GV12. The second outer wall BS12 abuts against the second inner wall GV12 at a second position P2. At a position closer to the bottom surface of the groove GV1 than the second position P2, a gap is formed between the second outer wall BS12 and the second inner wall GV12. Therefore, during ultrasonic welding, the abutment between the second outer wall BS12 and the second inner wall GV12 at the second position P2 can ensure the relative positional accuracy of the cylinder 11 and the cover 12 in the direction orthogonal to the axial direction L after welding. Furthermore, the gap formed between the second outer wall BS12 and the second inner wall GV12 can be used to accommodate burrs and prevent burrs from flying outward.
[0093] Similarly, according to the pump device 1 of this embodiment, the groove GV2 has a first inner wall GV21 and a second inner wall GV22 as opposing sidewalls, and the protrusion BS2 has a first outer wall BS21 opposite to the first inner wall GV21 and a second outer wall BS22 opposite to the second inner wall GV22. The first outer wall BS21 abuts against the first inner wall GV21 at a third position P3. At a position closer to the bottom surface of the groove GV2 than the third position P3, a gap is formed between the first outer wall BS21 and the first inner wall GV21. The second outer wall BS22 abuts against the second inner wall GV22 at a fourth position P4. At a position closer to the bottom surface of the groove GV2 than the fourth position P4, a gap is formed between the first outer wall BS21 and the first inner wall GV21. The bottom surface of the groove GV2 forms a gap between the second outer wall BS22 and the second inner wall GV22. Therefore, during ultrasonic welding, the relative positional accuracy of the base plate 21 and the blade 22 in the direction orthogonal to the axial direction L can be ensured by the first outer wall BS21 and the first inner wall GV21 abutting at the third position P3 and the second outer wall BS22 and the second inner wall GV22 abutting at the fourth position P4. Furthermore, the gaps formed between the first outer wall BS21 and the first inner wall GV21 and between the second outer wall BS22 and the second inner wall GV22 can be used to accommodate burrs and prevent burrs from flying outward.
[0094] The present invention has been described above by way of example with reference to the accompanying drawings. Obviously, the specific implementation of the present invention is not limited to the above embodiments.
[0095] For example, in the above embodiments, the welding structure of the present invention has been described using pump device 1 as an example, but it is not limited thereto, and the welding structure of the present invention can also be applied to other occasions.
[0096] Furthermore, in the above embodiment, the first outer wall BS11 is separated from the first inner wall GV11, but this is not limited to this. Alternatively, the first outer wall BS11 and the first inner wall GV11 may abut at a first position, and a gap may be formed between the first outer wall BS11 and the first inner wall GV11 at a position closer to the bottom surface of the groove GV1 than the first position. Depending on the situation, the first outer wall BS11 may also be configured to abut the first inner wall GV11, while the second outer wall BS12 is separated from the second inner wall GV12.
[0097] Furthermore, in the above embodiments, the first inner wall GV11 and the second inner wall GV12 of the groove GV1 extend along the axial direction L, and the first inner wall GV21 and the second inner wall GV22 of the groove GV2 extend along the axial direction L, but are not limited thereto. The first inner wall GV11 and the second inner wall GV12 of the groove GV1 may also be inclined relative to the axial direction L, and the first inner wall GV21 and the second inner wall GV22 may also be inclined relative to the axial direction L.
[0098] Furthermore, in the above embodiments, depending on the circumstances, the first outer wall BS21 may be separated from the first inner wall GV21 (i.e., not in contact), or the second outer wall BS22 may be separated from the second inner wall GV22 (i.e., not in contact).
[0099] Furthermore, in the above embodiment, a stepped surface is formed at the front end of the protrusion BS2, but it is not limited to this and may not have a stepped surface.
[0100] It should be understood that within the scope of this utility model, the various parts in the embodiments can be freely combined, or the various parts in the embodiments can be appropriately modified or omitted.
Claims
1. A welded structure comprising a first component and a second component, the first component having a groove, the second component having a protrusion, the protrusion being inserted into the groove and its front end being joined to the bottom surface of the groove by ultrasonic welding, characterized in that... The groove has a first inner wall and a second inner wall that serve as sidewalls opposite to each other, and the protrusion has a first outer wall opposite to the first inner wall and a second outer wall opposite to the second inner wall. The first outer wall abuts against the first inner wall at a first position, and a gap is formed between the first outer wall and the first inner wall at a position closer to the bottom surface than the first position; and / or, the second outer wall abuts against the second inner wall at a second position, and a gap is formed between the second outer wall and the second inner wall at a position closer to the bottom surface than the second position.
2. The welded structure as described in claim 1, characterized in that, The first outer wall forms surface contact with the first inner wall in a first region from the first position to a position farther away from the bottom surface than the first position. And / or, The second outer wall forms surface contact with the second inner wall in a second region from the second position to a position farther away from the bottom surface than the second position.
3. The welded structure as described in claim 2, characterized in that, The first outer wall has a first separating surface and a first contact surface. The first separating surface extends from the first position toward the bottom surface toward the second inner wall side and is spaced apart from the first inner wall. The first contact surface extends from the first separating surface in a bent direction away from the bottom surface and forms surface contact with the first inner wall in the first region. And / or, The second outer wall has a second separation surface and a second contact surface. The second separation surface extends from the second position toward the bottom surface toward the first inner wall side and is spaced apart from the second inner wall. The second contact surface extends from the second separation surface in a bent direction away from the bottom surface and forms a surface contact with the second inner wall in the second region.
4. The welded structure as described in claim 2, characterized in that, The first outer wall has a first contact surface and a first separation surface. The first contact surface is inclined relative to the bottom surface and forms surface contact with the first inner wall in the first region. The first separation surface extends from the first contact surface in a bent manner toward the bottom surface and is spaced apart from the first inner wall. And / or, The second outer wall has a second contact surface and a second separation surface. The second contact surface is inclined relative to the bottom surface and forms a surface contact with the second inner wall in the second region. The second separation surface extends from the second contact surface in a bent manner toward the bottom surface and is spaced apart from the second inner wall.
5. The welded structure as described in claim 4, characterized in that, The first separation surface is perpendicular to the bottom surface. And / or, The second separation surface is perpendicular to the bottom surface.
6. The welded structure as described in any one of claims 1 to 5, characterized in that, The first inner wall is perpendicularly connected to the bottom surface. And / or, The second inner wall is perpendicularly connected to the bottom surface.
7. The welded structure as described in any one of claims 1 to 5, characterized in that, Both the first component and the second component are made of resin.
8. A pump device, characterized in that, The welded structure having any one of claims 1 to 7.
9. The pump device as claimed in claim 8, characterized in that, It has a shell, The housing has: The cylindrical portion constituting one of the first component and the second component; and A cover that constitutes the other of the first and second components and covers one axial end of the cylindrical portion.
10. The pump device as claimed in claim 8, characterized in that, It has an impeller, The impeller has: The base plate constituting one of the first component and the second component; and The blade that constitutes the other of the first component and the second component.