Shield pump connected through spin welding

Abstract

The utility model discloses a shield pump which comprises a pump cover and a pump body, an annular flange is formed on the outer edge of the pump cover, and an annular first sealing rib is formed on the end face of the flange in a protruding mode. The pump body comprises an annular shielding sleeve waterproof part with an opening in one end formed in the center and used for containing the rotor, an annular shell part surrounding the stator assembly is formed on the periphery, the connecting part extends to the shell part from the opening end of the waterproof part to the periphery, and a cavity for containing the stator is defined by the shell part, the connecting part and the waterproof part; an annular second sealing rib matched with the first sealing rib is arranged on the outer side of the shielding sleeve connecting part, the end face of the second sealing rib is lower than the end face of the shielding sleeve connecting part, a first flash groove formed in a downward concave mode is formed between the second sealing rib and the shielding sleeve connecting part, and a second flash groove formed in a downward concave mode is formed in the end face of the second sealing rib. In addition, due to the fact that flash generated during spin welding connection can enter the first flash groove and the second flash groove, the flash can be prevented from polluting the water channel, and the flash hiding effect is better.

Description

Technical Field

[0001] The utility model relates to a canned pump with a spin welding connection, which can be classified into F04D29 / 42 and F04D29 / 08 in IPC classification. Background Art

[0002] In the related technology, current automotive electronic water pumps mainly use shielded pumps. For example, Chinese patent document CN214330982U discloses a miniature shielded pump with a fixed core shaft. During rotary friction welding assembly, the other free end of the core shaft extends into the blind hole and fits with the gap of the blind hole, and has an interference fit with the ribs. The ribs soften or melt during rotary friction welding to wrap the free end of the core shaft, so that the free end of the core shaft is tightly fixed to the pump cover, effectively reducing the vibration of the free end of the core shaft and the runout of the impeller and rotor mounted on the core shaft, and reducing noise. However, the overflow generated during spin welding cannot be properly handled, and the overflow is easy to enter the waterway, affecting the performance of the shielded pump.

[0003] For relevant terminology and common knowledge, please refer to the national standard GB / T 7021-2019 "Terminology of Centrifugal Pumps", the "Mechanical Engineering Handbook" and "Electrical Engineering Handbook" published by the Machinery Industry Press in 1983 or 1997, Chinese patent CN220769782U "A centrifugal pump with a pump body and a pump cover connected by rotary welding", and Chinese patent CN216044618U "An automotive electronic water pump with a new sealing structure". Utility Model Content

[0004] The utility model aims to solve at least one of the technical problems existing in the prior art. To this end, the utility model provides a shielded pump, which can easily solve the overflow generated during spin welding.

[0005] In the first aspect, the utility model provides a shielded pump, comprising a pump cover and a pump body, the outer edge of the pump cover is formed with an annular flange, the end surface of the flange protrudes to form an annular first sealing rib, the pump body comprises a water-blocking portion with an opening at one end for accommodating a rotor in the center, an annular outer shell portion formed on the outer periphery and surrounding a stator assembly, and a connecting portion extending from the open end of the water-blocking portion to the outer periphery to the outer shell portion, the outer shell portion, the connecting portion and the water-blocking portion form a cavity for accommodating the stator, an annular second sealing rib cooperating with the first sealing rib is provided on the outer side of the connecting portion, the end surface of the second sealing rib is lower than the end surface of the connecting portion, a first overflow groove formed by a concave depression is provided between the second sealing rib and the connecting portion, and a second overflow groove formed by a concave depression is provided on the end surface of the second sealing rib.

[0006] The shielded pump according to the embodiment of the utility model has at least the following beneficial effects: by arranging the first overflow groove and the second overflow groove on the pump body, when the first sealing rib and the second sealing rib are spin-welded, the generated overflow will enter the first overflow groove and the second overflow groove, thereby preventing the overflow from polluting the waterway and achieving a better effect of hiding the overflow.

[0007] According to some embodiments of the utility model, a water inlet pipe is arranged at the center of the pump cover, a positioning column is arranged at the center of one end of the inner cavity of the water inlet pipe, a blind hole is arranged at the center of the positioning column, a convex rib is arranged on the inner wall of the blind hole, the opening of the blind hole faces away from the inlet of the water inlet pipe, a steel shaft is arranged at the axis of the pump body, one end of the steel shaft extends from the opening of the blind hole and is connected to the convex rib by spin welding, so that the pump cover is connected to the pump body. The convex rib on the inner wall of the blind hole holds the steel shaft tightly during the spin welding connection, performs concentric positioning, and prevents eccentricity when the pump cover and the pump body are connected.

[0008] According to some embodiments of the utility model, a first inclined surface is formed between an end surface formed by an inwardly inclined outer wall of the first sealing rib and the first limiting plane, a second inclined surface is formed between an end surface formed by an outwardly inclined inner wall of the second sealing rib and the first overflow groove, and the first inclined surface and the second inclined surface are connected by spin welding. The connection between the first inclined surface and the second inclined surface can form a sealed fixed state between the pump cover and the pump body, and the sealing performance is good.

[0009] According to some embodiments of the utility model, the first sealing rib forms a first limiting plane and a second limiting plane on the outer and inner sides respectively, a first mounting groove is formed between the shielding sleeve and the second sealing rib inclined surface and the outer periphery of the connecting portion, the end face of the second sealing rib forms a third limiting plane with the outer protrusion of the second overflow groove, and a fourth limiting plane is also provided on the outer edge of the end face of the shielding sleeve connecting portion. When the pump cover and the pump body are connected by spin welding through the first sealing rib and the second sealing rib, the first sealing rib extends into the first mounting groove, the first limiting plane abuts against the third limiting plane, and the second limiting plane abuts against the fourth limiting plane. During the abutment process between the first limiting plane and the third limiting plane and the abutment process between the second limiting plane and the fourth limiting plane, the large vibration of the first sealing rib and the second sealing rib during the spin welding connection is limited, and secondary concentric positioning can be performed to prevent eccentricity problems.

[0010] According to some embodiments of the present invention, the first inclined surface and the second inclined surface are connected by spin welding to form a joint, the cross-sectional area of ​​the joint is S1, the cross-sectional area of ​​the first overflow groove is S3, the cross-sectional area of ​​the second overflow groove is S2, and the following conditions are satisfied: S2 ≥ S1, Most of the overflow generated during spin welding enters the second overflow trough, and a small part enters the first overflow trough, so that the second overflow trough will not enter the waterway due to being filled with overflow, and the effect of hiding the overflow is better.

[0011] According to some embodiments of the present invention, the first inclined surface and the second limiting plane are at a first angle The second inclined surface forms a second angle with the fourth limiting plane The first angle and the second angle satisfy: Since the first angle is equal to the second angle, the first inclined plane is parallel to the second inclined plane. When the spin welding descends, the two parallel inclined planes can automatically adjust to be concentric, thereby preventing eccentricity.

[0012] According to some embodiments of the present invention, the first angle Also satisfied The second angle Also satisfied Different bevel angles can reduce the radial size of the canned motor pump to varying degrees.

[0013] According to some embodiments of the utility model, the steel shaft includes a large diameter end and a small diameter end, the large diameter end is fixed to the axis of the pump body, and the small diameter end extends into the blind hole and is connected to the convex rib by spin welding, so that the pump cover is connected to the pump body. The small diameter end is spin welded to the convex rib, which can play a role in concentric positioning of the pump cover and the pump body.

[0014] According to some embodiments of the utility model, the center hole positioning column is supported on the bottom of the water inlet pipe of the pump cover by a bracket. The support frame can firmly fix the blind hole to the center of the water inlet pipe, reduce the vibration during the spin welding connection, and improve the stability of the spin welding connection. BRIEF DESCRIPTION OF THE DRAWINGS

[0015] The accompanying drawings are used to provide a further understanding of the technical solution of the utility model and constitute a part of the specification. Together with the embodiments of the utility model, they are used to explain the technical solution of the utility model and do not constitute a limitation on the technical solution of the utility model.

[0016] Figure 1 It is an overall schematic diagram of a canned motor pump provided by an embodiment of the utility model;

[0017] Figure 2 yes Figure 1 An exploded schematic diagram of a canned motor pump is shown;

[0018] Figure 3 yes Figure 1 A top view of the canned motor pump is shown;

[0019] Figure 4yes Figure 2 A cross-sectional view of a front view of a canned motor pump is shown;

[0020] Figure 5 yes Figure 4 A partial enlarged view of the canned motor pump is shown;

[0021] Figure 6 yes Figure 4 Another partial enlarged view of the canned motor pump is shown;

[0022] Figure 7 yes Figure 2 A front view of a pump cover of a canned motor pump is shown;

[0023] Figure 8 yes Figure 7 A bottom view of the pump cover is shown;

[0024] Fig. 9 yes Figure 8 A partial enlarged view of the pump cover is shown;

[0025] Fig.10 yes Figure 2 A front view of a pump body of a canned motor pump is shown;

[0026] Fig.11 yes Figure 4 The pump cover of the canned pump is not completely combined with the pump body;

[0027] Fig.12 yes Fig.11 A partial enlarged view of the canned motor pump is shown;

[0028] Fig.13 yes Figure 4 The pump cover of the canned pump is shown to be completely combined with the pump body;

[0029] Fig.14 yes Fig.13 A partial enlarged view of the canned motor pump is shown.

[0030] Figure Number:

[0031] Canned motor pump 100;

[0032] Pump cover 200; flange 210; first sealing rib 220; first limiting plane 221; second limiting plane 222; first inclined plane 223; water inlet pipe 230; blind hole 231; convex rib 232; bracket 233; positioning column 234;

[0033] Pump body 300; connecting portion 310; fourth limiting plane 311; water-isolating portion 312; outer shell portion 313; second sealing rib 320; first overflow groove 321; second overflow groove 322; first mounting groove 323; third limiting plane 324; second inclined surface 325; steel shaft 330; large diameter end 331; small diameter end 332;

[0034] The joint 400. DETAILED DESCRIPTION

[0035] The embodiments of the present invention are described in detail below, and examples of the embodiments are shown in the accompanying drawings, wherein the same or similar reference numerals throughout represent the same or similar elements or elements having the same or similar functions. The embodiments described below with reference to the accompanying drawings are exemplary and are only used to explain the present invention, and cannot be understood as limiting the present invention.

[0036] In the description of the present invention, it should be understood that the descriptions involving orientation, such as the orientation or positional relationship indicated as up, down, etc., are based on the orientation or positional relationship shown in the drawings, and are only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as a limitation on the present invention.

[0037] In the description of the present utility model, "a plurality" means more than two. If there is a description of "first" or "second", it is only for the purpose of distinguishing the technical features, and cannot be understood as indicating or implying the relative importance or implicitly indicating the number of the indicated technical features or implicitly indicating the order of the indicated technical features.

[0038] In the description of the present invention, unless otherwise clearly defined, terms such as setting, installing, connecting, etc. should be understood in a broad sense, and technicians in the relevant technical field can reasonably determine the specific meanings of the above terms in the present invention based on the specific content of the technical solution.

[0039] Reference Figure 1 , Figure 2 , Figure 4 , Figure 5 , Figure 6The shielded pump 100 includes a pump cover 200 and a pump body 300. The main body of the pump cover 200 is roughly a gyroscope, and an annular flange 210 is formed on its outer edge. The end surface of the flange 210 protrudes to form an annular first sealing rib 220; the pump body 300 includes a water-blocking portion 312 with an opening at one end for accommodating the rotor, an annular shell portion 313 formed on the outer periphery and surrounding the stator assembly, and a connecting portion 310 extending from the open end of the water-blocking portion 312 to the outer periphery to the shell portion 313, the shell portion 313, the connecting portion 3 10 and the water-isolating portion 312 form a cavity for accommodating the stator, and an annular second sealing rib 320 is provided on the outer side of the connecting portion 310 to cooperate with the first sealing rib 220, and the end face of the second sealing rib 320 is lower than the end face of the connecting portion 310, and a first overflow groove 321 formed in a concave shape is provided between the second sealing rib 320 and the connecting portion 310 for accommodating overflow generated during spin welding, and a second overflow groove 322 formed in a concave shape is provided on the end face of the second sealing rib 320, which is also used to accommodate overflow generated during spin welding. Specifically, the cross-section of the first sealing rib 220 is an "inverted trapezoid" and the cross-section of the second sealing rib 320 is a "trapezoidal" shape. When the pump cover 200 and the pump body 300 are spin-welded together, excess overflow will be generated after the first sealing rib 220 and the second sealing rib 320 come into contact. Most of the overflow enters the first overflow groove 321 due to gravity, and part of it enters the second overflow groove 322, thereby avoiding the problem of burrs and flash, thereby preventing excess overflow from passing through the end face 311 of the connecting part 310 and entering the water barrier 312 to pollute the waterway.

[0040] Reference Figures 7 to 10 A water inlet pipe 230 is arranged at the center of the pump cover 200, and a positioning column 234 is arranged at the center of one end of the inner cavity of the water inlet pipe 230. A blind hole 231 is arranged at the center of the positioning column, and a convex rib 232 is arranged on the inner wall of the blind hole 231. The opening of the blind hole 231 is facing away from the inlet of the water inlet pipe 231. A steel shaft 330 is arranged at the axial position of the pump body 300. During spin welding, one end of the steel shaft 330 extends from the opening of the blind hole 231 and contacts with the convex rib 232. The convex rib 232 softens or melts to wrap around the end of the steel shaft 330 extending into the blind hole 231 and fixes the steel shaft 330, so that the pump cover 200 and the pump body 300 are well aligned, which plays a role of concentric positioning. Specifically, the steel shaft 330 includes a large diameter end 331 and a small diameter end 332. The large diameter end 331 is fixed to the axial center of the pump body 300, and the small diameter end 332 extends into the blind hole 231. When the spin welding descends, the small diameter end 332 contacts the convex rib 232, and the convex rib 232 softens or melts to wrap the small diameter end 332 to achieve concentric positioning. Specifically, the positioning column 234 is supported at the bottom of the water inlet pipe 230 of the pump cover 200 through the bracket 233, which can not only play a supporting role, but also leave space to improve the efficiency of water inlet, reduce the vibration caused by the spin welding connection, and improve the stability of the spin welding connection.

[0041] It is understandable that the number of ribs 232 can be set to multiple, and the more ribs 232 are set, the better the fixing effect of the blind hole 231 and the steel shaft 330, and the better the positioning effect. The number of ribs 232 can be set as needed, and the present application does not make a specific setting for the number of ribs 232.

[0042] It is understandable that the bracket 233 can be a tripod bracket, a four-legged bracket, etc. The more legs it has, the stronger the supporting effect and the less likely it is to be damaged. However, the legs will hinder the flow of water and affect the water inlet efficiency, making the water inlet efficiency lower. Therefore, the number of legs of the bracket 233 can be set according to actual conditions. The number of legs of the bracket 233 of the present application is preferably not more than 5.

[0043] refer to Figure 5 and Figure 6 The first sealing rib 220 is provided with a first limiting plane 221 and a second limiting plane 222 on the outer and inner sides thereof. The inner peripheral wall of the second sealing rib 320 is inclined outward to form a second inclined plane 325, and a first mounting groove 323 is formed between the second inclined plane 325 and the outer periphery of the connecting portion 310. The end surface of the second sealing rib 320 protrudes from the outer side of the second overflow groove 322 to form a third limiting plane 324. The outer edge of the end surface of the connecting portion 310 is also provided with a fourth limiting plane 311. When the first sealing rib 220 is spin-welded, it extends into the first mounting groove 323, the first limiting plane 221 abuts against the third limiting plane 324, and the second limiting plane 222 abuts against the fourth limiting plane 311. Specifically, the cross-section of the first mounting groove 323 is trapezoidal, which can cooperate with the "inverted trapezoidal" first sealing rib 220, so that the first sealing rib 220 can extend into the first mounting groove 323. When the first limiting plane 221 and the third limiting plane 324 are abutted, and the second limiting plane 222 and the fourth limiting plane 311 are abutted, the pump cover 200 can be positioned with the pump body 300 when it descends, preventing eccentricity problems and forming a sealed waterway.

[0044] refer to Figure 5 , Figure 6 and Fig.12 The outer peripheral wall of the first sealing rib 220 is inclined inward to form a first inclined surface 223. During spin welding, the first inclined surface 223 and the second inclined surface 325 will produce overflow due to the high-speed friction between each other. Since the first overflow groove 321 and the second overflow groove 322 are provided, the overflow will enter the first overflow groove 321 and the second overflow groove 322, preventing the overflow from entering the water barrier 312 along the assembly gap between the pump cover 200 and the pump body 300, thereby affecting the water channel or generating foreign matter that affects the overall cooling system.

[0045] refer to Figures 11 to 14After the first inclined surface 223 and the second inclined surface 325 are connected by spin welding, a joint portion 400 is formed, the cross-sectional area of ​​the joint portion 400 is S1, the cross-sectional area of ​​the first overflow groove 321 is S3, the cross-sectional area of ​​the second overflow groove 322 is S2, and the cross-sectional area of ​​the second overflow groove 322 is greater than or equal to the cross-sectional area of ​​the joint portion 400, that is, S2 ≥ S1, and the cross-sectional area of ​​the first overflow groove 321 is greater than or equal to one-half of the cross-sectional area of ​​the joint portion 400, that is, Specifically, during the spin welding melting process, the excess overflow will enter the first overflow groove 321 or the second overflow groove 322 along the first inclined surface 223 and the second inclined surface 325, and mainly enter the second overflow groove 322. Therefore, the cross-sectional area S2 of the second overflow groove 322 is greater than or equal to the area S3 of the first overflow groove 321. The first overflow groove 321 serves as a secondary overflow groove, and it is sufficient that the cross-sectional area S3 of the first overflow groove 321 is greater than or equal to the cross-sectional area S1 of the joint 400. This not only has a good effect in hiding the overflow, but also can save materials and reduce costs.

[0046] It is understandable that the cross-sectional area of ​​the first overflow groove 321 and the cross-sectional area of ​​the second overflow groove 322 are determined according to the cross-sectional area of ​​the coupling portion 400 . Therefore, the present application does not make specific settings for the cross-sectional area of ​​the first overflow groove 321 and the cross-sectional area of ​​the second overflow groove 322 .

[0047] refer to Figure 5 and Figure 6 The first inclined surface 223 and the second limiting plane 222 form a first angle The second inclined surface 325 forms a second angle with the fourth limiting plane 311 First Angle Equal to the second angle Therefore, in fact, the first bevel 223 and the second bevel 325 are parallel. During spin welding, since the first bevel 223 and the second bevel 325 are parallel, the first bevel 223 and the second bevel 325 are completely fitted together, so that the friction melting of the two bevels is more uniform, and there will be no local melting. In addition, when the two bevels fit together, the position of the pump cover 200 can be automatically adjusted, so that the pump cover 200 and the pump body 300 are concentric, which plays a positioning role. Specifically, the first angle Also satisfied Second Angle Also satisfied Since the angles between the first inclined surface 223 and the second inclined surface 325 and the horizontal plane are both within the range of 0 to 90 degrees, the vertical space is fully utilized and the radial area of ​​the horizontal plane is reduced. Therefore, the radial dimension of the canned motor pump 100 is smaller, material is saved, and the cost is lower.

[0048] Exemplarily, the angle between the first angle φ1 and the second angle φ2 and the horizontal plane is 60° respectively, so the first bevel 223 is parallel to the second bevel 325. During spin welding, the first bevel 223 is fitted with the second bevel 325, and the position of the pump cover 200 is adjusted. The first limiting plane 221, the second limiting plane 222, the third limiting plane 324 and the fourth limiting plane 311 are cooperated to make the pump cover 200 and the pump body 300 concentric, and then the two bevels are evenly melted under high-speed friction, and finally cooled and combined.

[0049] It is understandable that the first angle and the second angle It can be set according to the needs of the radial size, and only needs to be greater than 0° and less than 90°. and the second angle The degree is not set specifically.

[0050] It should be noted that the first angle and the second angle The larger the angle is, the larger the vertical space is, and the smaller the radial dimension of the canned motor pump 100 is. For example, the first angle of the first solution is and the second angle The angle of the second solution is 60°. and the second angle The angle is 30°, then the radial dimension of the canned pump 100 arranged according to the first scheme is smaller than the radial dimension of the canned pump 100 arranged according to the second scheme.

[0051] The embodiments of the present invention are described in detail above in conjunction with the accompanying drawings, but the present invention is not limited to the above embodiments, and various changes can be made within the knowledge scope of ordinary technicians in the relevant technical field without departing from the purpose of the present invention.

Claims

1. A canned motor pump (100) connected by spin welding, characterized in that: The pump cover (200) comprises a pump body (300), wherein the outer edge of the pump cover (200) is formed with an annular flange (210), and the end surface of the flange (210) is protrudingly formed with an annular first sealing rib (220), and the pump body (300) comprises a water-blocking portion (312) with an opening at one end for accommodating a rotor, an annular outer shell portion (313) formed on the outer periphery and surrounding a stator assembly, and a connecting portion (310) extending from the open end of the water-blocking portion (312) to the outer periphery to the outer shell portion (313), wherein the outer shell portion (313) and the pump body (300) are connected to each other. The connecting portion (310) and the water-isolating portion (312) form a cavity for accommodating the stator. An annular second sealing rib (320) is provided on the outer side of the connecting portion (310) to cooperate with the first sealing rib (220). The end face of the second sealing rib (320) is lower than the end face of the connecting portion (310). A first concave overflow groove (321) is provided between the second sealing rib (320) and the connecting portion (310). A second concave overflow groove (322) is provided on the end face of the second sealing rib (320).

2. The canned motor pump (100) according to claim 1, characterized in that: A water inlet pipe (230) is arranged at the center of the pump cover (200), a positioning column (234) is arranged at the center of one end of the inner cavity of the water inlet pipe (230), a blind hole (231) is arranged at the center of the positioning column (234), a convex rib (232) is arranged on the inner wall of the blind hole (231), the opening of the blind hole (231) faces away from the inlet of the water inlet pipe (230), a steel shaft (330) is arranged at the axis of the pump body (300), one end of the steel shaft (330) extends from the opening of the blind hole (231) and is connected to the convex rib (232) by spin welding, so that the pump cover (200) is connected to the pump body (300).

3. The canned motor pump (100) according to claim 1, characterized in that: The outer peripheral wall of the first sealing rib (220) is inclined inwardly to form a first inclined surface (223), and the inner peripheral wall of the second sealing rib (320) is inclined outwardly to form a second inclined surface (325), and the first inclined surface (223) and the second inclined surface (325) are connected by spin welding.

4. The canned motor pump (100) according to claim 3, characterized in that: A first limiting plane (221) and a second limiting plane (222) are formed on the outer and inner sides of the first sealing rib (220), respectively; a first mounting groove (323) is formed between the second inclined surface (325) and the outer periphery of the connecting portion (310); an end surface of the second sealing rib (320) protrudes from the outer side of the second overflow groove (322) to form a third limiting plane (324); a fourth limiting plane (311) is also provided on the outer edge of the end surface of the connecting portion (310); when the pump cover (200) and the pump body (300) are connected by spin welding through the first sealing rib (220) and the second sealing rib (320), the first sealing rib (220) extends into the first mounting groove (323), the first limiting plane (221) and the third limiting plane (324) are in contact with each other, and the second limiting plane (222) and the fourth limiting plane (311) are in contact with each other.

5. The canned motor pump (100) according to claim 3, characterized in that: The first inclined surface (223) and the second inclined surface (325) are connected by spin welding to form a joint portion (400), the cross-sectional area of ​​the joint portion (400) is S1, the cross-sectional area of ​​the first overflow groove (321) is S3, the cross-sectional area of ​​the second overflow groove (322) is S2, and the following conditions are satisfied: S2 ≥ S1, 6. The canned motor pump (100) according to claim 4, characterized in that: The first inclined surface (223) and the second limiting plane (222) form a first angle The second inclined surface (325) and the fourth limiting plane (311) form a second angle The first angle and the second angle satisfy:

7. The canned motor pump (100) according to claim 6, characterized in that: The first angle Also satisfied The second angle Also satisfied 8. The canned motor pump (100) according to claim 2, characterized in that: The steel shaft (330) comprises a large diameter end (331) and a small diameter end (332), wherein the large diameter end (331) is fixed to the axis of the pump body (300), and the small diameter end (332) extends into the blind hole (231) and is connected to the convex rib (232) by spin welding, so that the pump cover (200) is connected to the pump body (300).

9. The canned motor pump (100) according to claim 2, characterized in that: The positioning column (234) is supported on the bottom of the water inlet pipe (230) of the pump cover (200) through a bracket (233).

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