Shield pump

Abstract

A shield pump comprises a shield shell assembly (26) and a first bearing (27), the shield shell assembly (26) comprises a first shield shell (261), a shield cover (263) and a first bearing fixing part (264), the first bearing (27) is fixedly connected with the first bearing fixing part (264), the first shield shell (261) comprises a top wall part (2613), the top wall part (2613) is provided with an opening, the shield cover (263) is fixedly connected with the top wall part (2613), the shield cover (263) seals the opening, and the first bearing fixing part (264) is fixedly connected with the shield cover (263). The first bearing fixing part (264) is fixedly connected to one side of the top wall part (2613) facing the direction of the inner cavity of the first shielding shell (261).

Description

A shielded pump

[0001] This application claims priority to the following four Chinese patent applications, the entire contents of which are incorporated herein by reference:

[0002] 1. Submitted to the China Patent Office on December 31, 2023, application number 202311871829.4, invention name “A Shielded Pump”;

[0003] 2. Submitted to the China Patent Office on December 31, 2023, with application number 202311872134.8 and the invention name “A Shielded Pump”;

[0004] 3. Submitted to the China Patent Office on December 31, 2023, with application number 202311873736.5 and the invention name “A Shielded Pump”;

[0005] 4. Submitted to the China Patent Office on December 31, 2023, application number 202311873739.9, invention name is "A method for manufacturing a shielded pump".

Technical field

[0006] The present application relates to the technical field of water circulation systems, and in particular to a shielded pump. [Background Technology]

[0007] In domestic hot water circulation systems, water pumps are required to circulate water through the system. Shielded pumps are widely used because they are relatively quiet and suitable for home use. Shielded pumps typically consist of a shielded housing and bearings. The bearings are located on the top wall of the housing, making further machining of the bearing bore difficult. [Summary of the invention]

[0008] The present invention aims to provide a canned motor pump that facilitates the machining of the inner bore of a bearing. To this end, one embodiment of the present invention adopts the following technical solution:

[0009] A shielded pump, characterized in that it includes a shielded shell assembly and a first bearing, the shielded shell assembly includes a first shielded shell, a shielding cover, and a first bearing fixing portion, the first bearing is fixedly connected to the first bearing fixing portion, the first shielded shell includes a top wall portion, the top wall portion is provided with an opening, the shielding cover is fixedly connected to the top wall portion, the shielding cover seals the opening, and the first bearing fixing portion is fixedly connected to the side of the top wall portion facing the inner cavity of the first shielded shell.

[0010] In the shielded pump provided in the above embodiment, the first bearing fixing portion is connected to the side of the top wall portion facing the inner cavity of the shell, the first bearing is fixedly connected to the first bearing fixing portion, and the top wall portion of the first shielded shell is provided with an opening, which can be conveniently performed through the opening of the top wall portion, which facilitates further processing of the inner hole of the bearing compared with the background technology.

Brief Description of the Drawings

[0011] FIG1 is a schematic diagram of the appearance of a canned motor pump according to an embodiment of the present application;

[0012] FIG2 is a cross-sectional view of a canned motor pump according to an embodiment of the present invention;

[0013] FIG3 is a cross-sectional view of a canned motor pump according to an embodiment of the present invention from another perspective;

[0014] FIG4 is a schematic structural diagram of the shielding shell assembly and the bearing in accordance with an embodiment of the present application;

[0015] FIG5 is a schematic structural diagram of a rotor assembly according to an embodiment of the present application;

[0016] FIG6 is a schematic diagram of the rotor shaft structure of the rotor assembly shown in FIG5 ;

[0017] FIG7 is a schematic diagram of the rotor casing structure of the rotor assembly shown in FIG5 ;

[0018] FIG8 is a schematic structural diagram of a rotor assembly according to another embodiment of the present application;

[0019] FIG9 is an enlarged view of portion I of FIG2. [Specific implementation method]

[0020] In order to enable those skilled in the art to better understand the technical solution provided by the present application, the technical solution of the present application is further described in detail below with reference to the accompanying drawings and specific embodiments.

[0021] Please refer to Figures 1, 2 and 3, wherein Figure 1 is a schematic diagram of the appearance of a shielded pump according to an embodiment of the present application, Figure 2 is a cross-sectional view of a shielded pump according to an embodiment of the present application, and Figure 3 is a cross-sectional view of a shielded pump according to an embodiment of the present application from another perspective. The shielded pump is located in a hot water circulation system and can use a DC synchronous motor as a drive source. It includes a first housing portion 1, a second housing portion 2, and a pump body portion 3. The first housing portion 1 is connected to one end of the second housing portion 2, and the pump body portion 3 is connected to the other end of the second housing portion 2. The first housing portion 1 includes a first main body portion 11 and a first cover portion 12. The first main body portion 11 and the first cover portion 12 are fixedly connected. A first sealing portion 13 is arranged between the first main body portion 11 and the first cover portion 12 to achieve sealing. The first main body portion 11 includes a first bottom wall portion 111. The first main body portion 11 and the first cover portion 12 roughly enclose a cavity 1a. A control board 15 is fixedly arranged inside the cavity 1a. The control board 15 is fixedly connected or position-limited to the first housing portion 1. The fixed connection or position-limiting connection described herein can be a direct connection, such as by providing a cylindrical protrusion inside the first housing portion. The cylindrical protrusion can be formed when the first housing portion is molded, and then the control board provided with a mounting hole is limited by cooperating with the cylindrical protrusion. Of course, it can also be an indirect connection, such as providing an intermediate component fixedly connected to the first housing portion, and then the control board is fixedly connected or position-limited to the intermediate component. That is, the fixed connection or position-limiting connection between the control board and the first housing portion described in this application means that the two are fixed in relative position by direct or indirect means. The control board 15 is electrically connected to the motor disposed in the second housing portion 2. The control board 15 is provided with a power module 151. The power module 151 generates a large amount of heat during operation. To improve the heat dissipation effect, a heat dissipation component 14 can be provided on the top of the first cover portion 12. The first housing portion 1 has a cavity 1a, and at least a portion of the control board 15 is located in the cavity 1a. A receiving portion 121 is provided on the side of the first cover portion 12 facing away from the cavity 1a, and at least a portion of the heat dissipation component 14 is located in the receiving portion 121. The first cover portion 12 has a receiving opening 1211, and the inner diameter of the receiving opening 1211 is smaller than the inner diameter of the receiving portion 121. Accordingly, a step portion 142 is provided on the side of the heat dissipation component 14 facing away from the control board. The mutual coordination between the step portion 142 and the receiving portion 121 facilitates a stronger connection between the heat dissipation component 14 and the first cover portion 12. During the operation of the shielded pump, the heat energy generated by the power module 151 will have a certain impact on the heat dissipation component 14. Due to the restriction of the receiving portion 121, the heat dissipation component 14 is not easily separated from the first cover portion.Specifically, the first cover portion 12 can be fixedly connected to the heat dissipation component 14 by injection molding to form an integral structure. For example, the heat dissipation component 14 can be placed in a specific mold and the first cover portion 12 can be formed by injection molding, so that the portion of the first cover portion 12 that covers the heat dissipation component 14, or at least a portion of the heat dissipation component 14 is not covered by the first cover portion 12 and is exposed to the air. At the same time, the side of the heat dissipation component 14 facing the cavity 11a can be in direct or indirect contact with the power module 151. As a specific embodiment, the heat dissipation component 14 includes a protrusion 141, at least a portion of the protrusion 141 is not covered by the first cover portion. The protrusion 141 can be formed by coating a thermally conductive material between the heat dissipation component 14 and the power module, such as liquid gold, thermal grease, silicone with high thermal conductivity, etc. At least a portion of the thermally conductive material can connect the heat dissipation component and the protrusion, so that the heat generated by the power module 151 can be dissipated through the heat dissipation component 14.

[0022] It can be seen that one side of the heat dissipation component 14 in this embodiment is directly or indirectly connected to the power module 15, and at least a portion of the other side of the heat dissipation component 14 is not covered by the first cover portion 12 and is exposed to the air, which is conducive to dissipating the heat generated by the power module 15 to the outside of the first shell portion 1.

[0023] The control board 15 converts household AC power into a DC signal that drives the synchronous motor. This signal, in turn, drives the permanent magnet motor. Different drive modes can also be configured, allowing the canned motor pump to provide different speed signals to the motor based on customer needs, ensuring the impeller, described below, moves at the desired speed.

[0024] The motor is at least partially arranged in the second housing portion 2, and the second housing portion 2 includes a side wall portion 21 and a top wall portion 22. An annular second sealing portion 23 is provided between the first housing portion 1 and the second housing portion 2 to achieve sealing between the two. The second housing portion 2 can be made of a metal material, such as aluminum. The first housing portion 1 and the second housing portion 2 can be fixed by fitting together and fixing with screws (not shown in the figure). As shown in Figure 2, the first main body portion 11 of the first housing portion 1 is provided with an annular portion 112, and accordingly, the upper outer periphery of the second housing portion 2 is provided with a step fitting portion 211, and the annular portion 112 is sleeved on the outer periphery of the step fitting portion 211, and a second sealing portion 23 is provided between the first housing portion 1 and the second housing portion 2 to achieve sealing. The second sealing portion 23 can adopt a sealing ring structure.

[0025] The control board 15 is fixedly provided with a reed assembly 152. The reed assembly 152 includes a first elastic portion 1521 and a second elastic portion 1522. The first elastic portion 1521 has a preset elastic force toward the second elastic portion 1522. Similarly, the second elastic portion 1522 also has a preset elastic force toward the first elastic portion 1521. Of course, only one of the first elastic portion 1521 or the second elastic portion 1522 may have a preset elastic force. In this way, before the pin is assembled, the first elastic portion 1521 and the second elastic portion 1522 can abut against each other and exert a certain interaction force. The shielded pump also includes a pin 16, which includes a pin body 163, a first end 161, and a second end 162. The first end 161, the second end 162, and the pin body 163 can be integrally structured, with the first end 161 located at one end of the pin body 163 and the second end 162 located at the other end of the pin body 163. The first end 161 of the pin 16 engages with the reed assembly 152. At least a portion of the first end 161 is positioned between the first and second resilient portions 1521, 1522, with the first and second resilient portions 1521, 1522 abutting against the first end 161. The reed assembly 152 is capable of clamping the first end 161 of the pin 16. This securing method facilitates assembly of the pin 16. The pin 16 is pre-positioned relative to the first body portion 11, and the relative position of the reed assembly 152 and the first body portion 11 can be pre-set. The pin can be easily inserted into the reed assembly 152, achieving a relatively stable clamping fixation. The second end 162 of the pin 16 can extend into the interior of the second housing portion 2 to establish an electrical connection with the stator coil described below.

[0026] The pin 16 and the pin injection molded part 164 are fixedly connected as an integral structure. Specifically, the pin 16 can be first placed as an insert in the first mold, and the pin injection molded part 164 can be molded in the position of the pin body 163 by injection molding, so that at least a portion of the pin body 163 is located within the pin injection molded part 164, thereby forming the pin assembly 165. The pin assembly 165 is then placed as an insert in the second mold, and the first body 11 is molded by injection molding, thereby achieving an integral connection between the pin 16 and the first body 11. During the second injection molding process, the outer edge of the pin injection molded part 164 can melt, thereby fusing with a portion of the first body 11, thereby achieving a secure connection. In this embodiment, the pin 16 and the pin injection molded part 164 are fixedly connected as an integral structure, which can relatively improve the sealing performance compared to the method of directly drilling a hole to insert the pin.

[0027] The top wall 22 of the second housing portion 2 is provided with a notch 221, into which a portion of the first body portion 11 extends, thereby enabling the pins 16 to conveniently achieve electrical connection with the stator coil located at least partially within the second housing portion 2. Similarly, the second end portions 162 of the pins 16 can also be connected to the stator coil by plugging.

[0028] The third housing portion 3 is fixedly connected to the second housing portion 2, with at least a portion of the impeller component 31 located within the interior of the third housing portion 3. The third housing portion 3 can be formed of cast iron. The impeller component 31 can be fixedly connected to the rotor shaft (described below) and can rotate with the rotation of the rotor shaft. The third housing portion 3 includes a first opening 32 and a second opening 33. The third housing portion 3 also includes an impeller cavity 34, with at least a portion of the impeller component 31 located within the impeller cavity 34. During operation of the canned motor pump, the motor drives the rotor shaft to rotate, thereby driving the impeller to rotate. This draws liquid in through the first opening 32 and performs work on the liquid, accelerating and pressurizing the liquid before it is discharged through the second opening 33. As the canned motor pump continues to operate, the liquid continues to flow through the system. In a specific usage scenario, the liquid can be water. The impeller component 31 includes an impeller mating portion 311, which mates with the second mating portion of the rotor shaft (described below), enabling a fixed connection between the two.

[0029] A sealing ring 35 is provided between the second housing portion 2 and the third housing portion 3. The second housing portion 2 and the third housing portion 3 can be fixed together by screws, and a seal is achieved by the sealing ring 35. As shown in FIG1 , the second housing portion 2 and the third housing portion 3 can be flange-connected and fixedly connected by screws 5.

[0030] The interior of the second housing portion 2 is provided with a stator core 24 and a coil 25. The stator core 24 and the coil 25 are fixed or confined within the interior of the second housing portion 2. The stator core 24 and the coil 25 are arranged in a ring shape, and at least a portion of the shielding housing assembly 26 is located within the space enclosed by the stator core 24 and the coil 25. The shielding housing assembly 26 includes a first shielding housing 261, a second shielding housing 262, and a shielding cover 263. The first shielding housing 261 can be made of stainless steel and can be integrally stamped from a plate. The first shielding housing 261 has a top wall portion 2613, which is provided with an opening. The shielding cover 263 can be fixedly connected to the opening of the first shielding housing 261 by welding and seals the opening. Specifically, in this embodiment, an annular raised portion 2611 can be provided on the top of the first shielding shell 261, facing away from the inner cavity of the first shielding shell 261, and a shielding shell step portion 26111 can be provided on the inner peripheral wall of the annular raised portion 2611. The generally plate-shaped shielding cover 263 can abut against the shielding shell step portion 26111, thereby conveniently achieving a sealed fixation between the two through laser welding. The advantage of this matching arrangement is that it facilitates the processing of the first bearing 27 described below. Before the shielding cover 263 is assembled, the first bearing 27 located inside the first shielding shell 261 and disposed near the opening can be conveniently processed through the top opening of the first shielding shell 261.

[0031] The shielding shell assembly 26 also includes a first bearing fixing portion 264, which includes a connecting portion 2641 and a fixing portion 2642. The connecting portion 2641 is generally cylindrical, and the first bearing 27 is fixedly connected or positionally connected to the connecting portion 2642. The fixing portion 2641 is generally plate-shaped, and the fixing portion 2641 and the first shielding shell 261 can be fixedly connected by welding. Specifically, in this embodiment, two or more fixing protrusions 26411, for example, five or six, can be provided on the side of the fixing portion 2641 near the opening. The side of the top wall 2613 of the first shielding shell 261 near the cavity is designed to abut against the fixing protrusions 26411, and then welded. For example, after the first shielding shell 261 and the first bearing fixing portion 264 are positioned, resistance welding can be used to secure them.

[0032] The first shielding shell 261 includes a small-diameter portion 261a and a large-diameter portion 261b. The inner diameter of the small-diameter portion 261a is adapted to the outer diameter of the rotor assembly described below. Specifically, it may be slightly larger than the outer diameter of the rotor assembly, allowing the rotor assembly to approach the inner wall 261a1 of the small-diameter portion 261a and rotate freely relative to the small-diameter portion 261a. The outer diameter of the large-diameter portion 261b is larger than that of the small-diameter portion 261a. The large-diameter portion 261b and the small-diameter portion 261a may be integrally formed. At least a portion of the large-diameter portion 261b is substantially perpendicular to the inner wall of the small-diameter portion 261a. A first shell positioning portion 2612 is provided on the outer periphery of the large-diameter portion 261b. The first shell positioning portion 2612 is located at least partially around the outer periphery of the large-diameter portion 261b. During machining, the inner wall 261a1 of the smaller diameter portion can be used as a positioning reference. Specifically, the tooling can be expanded within the inner wall 261a1 of the smaller diameter portion to secure the first shielding shell 261 in place. The grinding head can then be inserted through the top opening of the first shielding shell 261 into the inner hole 271 of the first bearing 27 to machine the first bearing inner hole 271. The top opening structure helps reduce the length of the grinding head shank and minimizes the possibility of vibration. Furthermore, while positioning the first shielding shell 261, the first shell positioning portion 2612 can also be machined. In a specific embodiment, this can be machined using lathe technology. This allows both the first bearing inner hole 271 and the first shell positioning portion 2612 to be machined in a single clamping operation of the first shielding shell 261. The machining order can vary, with either machining the first bearing inner hole 271 or the first shell positioning portion 2612 first. In this way, good coaxiality can be ensured between the first bearing inner hole 271 and the first housing positioning portion 2612 located at the large diameter portion 261b. After the first bearing inner hole 271 and the first housing positioning portion 2612 are processed, the shielding cover 263 is welded and sealed to the first shielding housing 261.

[0033] That is, the manufacturing method of the shielded pump mentioned in this embodiment can first position the inner wall of the small diameter portion 261a of the first shielding shell 261, and then the grinding knife can be extended through the opening provided in the top wall portion 263 of the first shielding shell 261 to process the inner hole of the first bearing 27, which is beneficial to improve the coaxiality of the first bearing 27 and the first shell positioning portion 2612.

[0034] The second shielding shell 262 includes a second bearing fixing portion 2621. At least a portion of the second bearing 28 is located in and fixedly connected to the second bearing fixing portion 2621. The second shielding shell 262 can be made of a plate with an inner hole, such as a pre-processed annular plate and then stamped. Alternatively, the plate can be stamped and then have a hole cut in the middle to form the second shielding shell 262. A flange structure is formed at the center of the hole in the second shielding shell 262, forming the second bearing fixing portion 2621. After the first and second shielding shells 261 and 262 are assembled, the second bearing fixing portion 2621 protrudes toward one side of the first shielding shell 261, and at least a portion of the second bearing 28 is located within the inner hole of the flange structure. The second shielding shell 262 has a second shell positioning portion 2622. Specifically, the outer periphery of the second shielding shell 262 has an extension portion 262a. At least a portion of the extension portion 262a can be arranged to be coaxial with the second bearing fixing portion 2621 and extend in the same direction, i.e., upward as shown in Figure 4. The second housing positioning portion 2622 is located on at least a portion of the inner circumferential wall of the extension portion 262a. During processing, it can be clamped to the outer circumference of the portion of the extension portion 262a, and then the second bearing inner hole 281 of the second bearing 28 is ground, and the second housing positioning portion 2622 is turned. In this way, the second bearing inner hole 281 and the second housing positioning portion 2622 have relatively good coaxiality. The second bearing inner hole 281 can be processed first, or the second housing positioning portion 2622 can be processed first. Of course, the above-mentioned clamping processing method is not limited. It can also be clamped to the second bearing inner hole 281, and then the second housing positioning portion 2622 can be processed by turning.

[0035] The inner edge of extension 262a, namely, second housing positioning portion 2622, has an inner diameter that matches the outer diameter of first housing positioning portion 2612. During assembly, a portion of extension 262a is fitted over large-diameter portion 261b, mating first housing positioning portion 2612 with second housing positioning portion 2622. Using first housing positioning portion 2612 as a reference, second bearing inner bore 281 can achieve good coaxiality with first housing positioning portion 2612, thereby ensuring good coaxiality between second bearing inner bore 281 and first bearing inner bore 271.

[0036] The structure of a rotor assembly according to one embodiment of the present invention will be described below with reference to Figures 5-7. Figure 5 is a schematic diagram of the rotor assembly according to one embodiment of the present invention; Figure 6 is a schematic diagram of the rotor shaft structure of the rotor assembly shown in Figure 5; and Figure 7 is a schematic diagram of the rotor sleeve structure of the rotor assembly shown in Figure 5. The rotor assembly 4 includes a rotor shaft 41, a rotor sleeve 42, a rotor baffle 43, a rotor shield 44, and a magnetic ring 45. The rotor shield 44 is generally tubular, and the rotor sleeve 42 is also generally tubular. The outer diameter of the rotor sleeve 42 is smaller than the inner diameter of the rotor shield 44, so that the rotor shield 44 can be placed around the outer periphery of the rotor sleeve 42, forming an annular space between the two. The magnetic ring 45 is located within the annular space, and the ends of the rotor shield 44 and the rotor sleeve 42 are sealed by the rotor baffle 43. Specifically, in this embodiment, the rotor baffle 43 includes a first baffle portion 431 and a second baffle portion 432. As a specific example, the first baffle portion 431 includes a first inner abutment portion 4311, a first outer abutment portion 4312, and a magnetic ring retaining portion 4313. The first baffle portion 431 is generally annular and may be a one-piece structure. The first inner abutment portion 4311 and the first outer abutment portion 4312 extend in the same direction relative to the magnetic ring retaining portion 4313. The magnetic ring retaining portion 4313 is capable of retaining the magnetic ring 45 in position. The first baffle portion 431 can be connected to the rotor casing 42 and the rotor shield 44 by laser welding. The second baffle portion 431 can have the same structure as the first baffle portion 431, retaining the magnetic ring 45 in position while also being secured to the rotor casing 42 and the rotor shield 44 by laser welding. This ensures that the magnetic ring 45 is retained within a relatively enclosed space. The rotor baffle 43, rotor sleeve 42, rotor shield 44, and magnetic ring 42 together constitute at least part of the magnetic ring assembly. In a specific embodiment, the thickness of the material used for the first baffle portion 431 and the second baffle portion 432 can be selected to be no greater than 1 mm. To facilitate laser welding and ensure press-fitting accuracy, the first baffle portion 431 and the second baffle portion 432 can be press-fitted with an interference fit. Taking the first baffle portion 431 as an example, the mating dimensions between the first inner abutting portion 4311 and the outer circumferential wall of the rotor sleeve 42, and between the first outer abutting portion 4312 and the inner circumferential wall of the rotor shield 44, can both be designed to be interference fits. This allows for a certain degree of elasticity in both the first outer abutting portion 4312 and the first inner abutting portion 4311 due to the relatively small thickness of the first baffle portion 431, thereby reducing the dimensional accuracy requirements for the first baffle portion 431.

[0037] Of course, the above-described first baffle portion 431 and second baffle portion 432 are merely one specific embodiment. To achieve position restraint of the magnetic ring 45, the specific structure of the first baffle portion 431 and second baffle portion 432 does not necessarily have to be used. For example, the first baffle portion 431 may also be provided with no first outer abutment portion and first inner abutment portion, as long as the magnetic ring 45 can be restrained in a relatively independent space and sealed and fixed to the rotor casing 42 and rotor shield 44. This will not be further elaborated here.

[0038] Referring to Figure 7 , the rotor sleeve 42 is generally tubular in shape, with sleeve grooves 421 provided on its inner wall. The number and shape of the sleeve grooves 421 are not limited. In one specific embodiment, the sleeve grooves 421 can be located at both ends of the inner circumferential wall of the rotor sleeve 42 and extend to the end surface of the inner circumferential wall. The rotor sleeve 42 can be made of a material such as stainless steel with good magnetic conductivity, or non-magnetic stainless steel. This makes the sleeve grooves 421 relatively easy to machine. For example, the sleeve grooves 421 can be formed by cutting the end surface of the rotor sleeve.

[0039] The rotor shaft 41 can be made of ceramic material. Its outer diameter is smaller than the inner diameter of the rotor sleeve 42. The rotor shaft 41 includes a first mating portion 412 and a second mating portion 413. The first mating portion 412 is located on the outer circumferential wall of one end of the rotor shaft 41, and the second mating portion 413 is located on the outer circumferential wall of the other end of the rotor shaft 41. The first mating portion 412 is configured to mate with the first bearing inner bore 271 described above, enabling the rotor shaft 41 to rotate relative to the first bearing inner bore 271. The second mating portion 413 is configured to be fixedly connected to the impeller component 31. Specifically, the second mating portion 413 is fixedly connected to the impeller mating portion 311. This allows the impeller component 31 to rotate when the rotor shaft 41 rotates. The rotor shaft 41 includes a through-hole 414. During use of the canned motor pump, water can flow through the through-hole 414, achieving pressure balance at both ends of the rotor shaft. A rotor shaft fitting portion 415 is provided on an outer peripheral wall of the rotor shaft 41 at one end close to the second fitting portion 413 . At least a portion of the rotor shaft fitting portion 415 can be rotatably fitted with the second bearing 28 .

[0040] The outer circumferential wall of the rotor shaft 41 is provided with rotor shaft grooves 411, and the number of rotor shaft grooves 411 is not limited. The rotor shaft 41 and the magnetic ring assembly can be connected by injection molding to form an injection molded body therebetween. The magnetic ring assembly herein refers to an assembly comprising at least the rotor baffle 43, rotor sleeve 42, rotor shield sleeve 44, and magnetic ring 42 described above. As a specific embodiment, the magnetic ring assembly and the rotor shaft can be placed in a specific mold so that the magnetic ring assembly and the rotor shaft are coaxially arranged. Because the outer diameter of the rotor shaft 41 is smaller than the inner diameter of the rotor sleeve 42, an annular space is formed between the two for the inflow of injection molding material. During injection molding, the injection molding material flows into the annular space between the magnetic ring assembly and the rotor shaft, forming an injection molded body 46. Because the inner circumferential wall of the rotor sleeve of the magnetic ring assembly is provided with a sleeve groove 421, when at least a portion of the sleeve groove 421 is filled with injection molding material, the injection molded body 46 is tightly connected to the rotor sleeve 42, making it difficult to separate. At the same time, because the outer peripheral wall of the rotor shaft 41 is provided with a rotor shaft groove 411, during injection molding, the injection molding material can flow into and fill at least a portion of the rotor shaft groove 411, thereby forming a tight and secure connection between the injection molded body 46 and the rotor shaft 41, making it difficult for the body to fall off. After the injection molding is completed, the magnetic ring assembly is fixedly connected to the rotor shaft and the injection molded body to form a rotor assembly 4. Of course, those skilled in the art will understand that, based on the above-mentioned embodiments, various changes or replacements can be made to the sleeve groove 421 of the rotor sleeve 42, such as providing an axially extending groove in the inner wall of the rotor sleeve, which can also achieve the purpose of increasing the connection strength between the injection molded body and the rotor sleeve.

[0041] The structure of a rotor assembly according to another embodiment of the present application will be described below with reference to FIG. 8 .

[0042] The rotor assembly 40 includes a rotor shaft 401, a rotor casing 402, a stator core 406, a rotor shield 404, a rotor baffle 403, and a magnetic ring 405. The rotor shield 404 is generally tubular, and the rotor casing 402 is generally tubular. The outer diameter of the rotor casing 402 is smaller than the inner diameter of the rotor shield 404. The stator core 406 and the magnetic ring 405 are generally annular. The inner diameter of the stator core 406 matches the outer diameter of the rotor casing 402, and the outer diameter of the magnetic ring 405 matches the inner diameter of the rotor shield 404. The magnetic ring 405 is located outside the stator core 406 and is confined between the rotor casing 402 and the rotor shield 404. The rotor casing 402 and the rotor shield 404 are sealed at both ends by the rotor baffle 403. Specifically, in this embodiment, the rotor baffle 403 includes a first baffle portion 4031 and a second baffle portion 4032. The first baffle portion 4031 includes a first inner abutting portion 40311, a first outer abutting portion 40312, and a stopper portion 40313. The first baffle portion 4031 can be formed by integral stamping. With the stopper portion 40313 as a reference, the first inner abutting portion 40311 and the first outer abutting portion 40312 extend in the same direction relative to the stopper portion 40313 to facilitate welding. Laser welding can be used to securely connect the first baffle portion 4031 to the rotor casing 402 and the rotor shield 404. The stopper portion 40313 can limit the position of the stator core 406 and the magnetic ring 405. In a specific embodiment, the thickness of the material selected for the first baffle portion 4031 and the second baffle portion 4032 can be selected to be no greater than 1 mm. In order to achieve laser welding and ensure the pressing accuracy, the first baffle portion 4031 and the second baffle portion 4032 can be press-fitted by interference. Taking the first baffle portion 4031 as an example, the matching dimensions between the first inner abutment portion 40311 and the outer peripheral wall of the rotor sleeve 402, and between the first outer abutment portion 40312 and the inner peripheral wall of the rotor shield sleeve 404 can be designed to be interference fit. In this way, since the thickness of the first baffle portion 4031 is relatively small, the first outer abutment portion and the first inner abutment portion both have a certain elasticity, which is conducive to reducing the dimensional accuracy requirements for the first baffle portion 4031.

[0043] The second baffle portion 4032 can adopt the same structure as the first baffle portion 4031 and be secured to the rotor casing 402 and the rotor shield 404 by laser welding. Thus, the rotor casing 402, the rotor shield 404, the first baffle portion 4031, and the second baffle portion 4032 define a generally annular space, within which the stator core 406 and the magnetic ring 405 are confined, thereby forming at least part of the rotor assembly. It should be noted that the rotor assembly is not limited to the four components described above; other components may be added without affecting the basic performance, and such structural changes should not deviate from the scope of protection claimed in this application.

[0044] Similar to the first embodiment of the rotor assembly described above, the first baffle portion 4031 and the second baffle portion 4032 are merely a specific implementation. To achieve position restraint of the magnetic ring 45, the specific structure of the first baffle portion 4031 and the second baffle portion 4032 does not necessarily have to be used. For example, the first baffle portion 4031 may not be provided with the first outer abutment portion and the first inner abutment portion, as long as the magnetic ring can be restrained in a relatively independent space and sealed and fixed to the rotor casing 402 and the rotor shield 404. This will not be further elaborated here.

[0045] The rotor shaft 401 can be made of ceramic material. The outer diameter of the rotor shaft 401 is compatible with the inner diameter of the rotor sleeve 402. The rotor shaft 401 includes a first mating portion 4012 and a second mating portion 413. The first mating portion 4012 is located on the outer circumferential wall of one end of the rotor shaft 41, and the second mating portion 4013 is located on the outer circumferential wall of the other end of the rotor shaft 401. The first mating portion 4012 is configured to mate with the first bearing inner hole 271 described above, enabling the rotor shaft 401 to rotate relative to the first bearing inner hole 2071. The second mating portion 4013 is configured to be fixedly connected to the impeller assembly described below. This allows the impeller assembly to rotate when the rotor shaft 401 rotates. The rotor shaft 401 includes a through-hole 4011. During use of the shielded pump, water can flow through the through-hole 4011, achieving pressure balance at both ends of the rotor shaft. A rotor shaft fitting portion 4015 is provided on an outer peripheral wall of the rotor shaft 401 at one end close to the second fitting portion 4013 . At least a portion of the rotor shaft fitting portion 4015 can be rotatably fitted with the second bearing 28 .

[0046] The outer diameter of the rotor shaft 401 is adapted to the inner diameter of the rotor sleeve 402, and the two can be a tight fit or a clearance fit. For example, the rotor sleeve 402 and the rotor shaft 401 can be designed to have an interference fit and then fixed by welding. In a specific embodiment, the rotor shaft 401 can be made of a ceramic material, and the rotor sleeve 402 can be made of a stainless steel material. When welding, the rotor sleeve 402 and the rotor shaft 401 are first fixed by an interference fit, and then a brazing material is placed at the contact point between the two. After heating, the brazing material melts to achieve welding fixation. Alternatively, the rotor sleeve 402 and the rotor shaft 401 are first positioned by a clearance fit, and then a brazing material is placed at the contact point between the two. After high-temperature heating, the brazing material melts to achieve welding fixation. The brazing material can specifically be a silver-containing solder paste with titanium added thereto. This brazing material facilitates welding between ceramic and metal materials. During the specific welding, furnace welding can be used. First, the rotor sleeve 402 and the rotor shaft 401 are fixed together and a brazing material is placed. The brazing material is placed at the junction of the two, such as the A portion shown in Figure 8, and then placed in a tunnel furnace for high-temperature heating to complete the welding. After the rotor sleeve and the rotor shaft are welded, the stator core, the magnetic ring, the rotor shield, the first baffle portion and the second baffle portion can be assembled. After assembly, the junction of the first baffle portion and the rotor shield, such as the B2 portion shown in Figure 8, can be fixed by welding, such as by laser welding. The junction between the first baffle portion and the rotor sleeve, such as the B1 portion shown in Figure 8, can be fixed by welding, such as by laser welding. There is no restriction on the welding order of B1 and B2.

[0047] The above describes in detail the structure and manufacturing method of the rotor assembly of the two embodiments. The installation structure of the rotor assembly is described below in conjunction with Figures 2 and 3. The canned motor pumps of Figures 2 and 3 correspond to the rotor assembly corresponding to Figure 5. The rotor assembly corresponding to Figure 5 is used as an example for the following description.

[0048] Below the magnetic ring assembly of the rotor assembly, i.e., on the portion of the rotor shaft 41 closer to the second mating portion, are a thrust washer 291 and a thrust bearing 292. The thrust washer 291 can be made of a rubber material and is closer to the magnetic ring assembly, or in other words, closer to the rotor sleeve 42, than the thrust bearing 292. The thrust bearing 292 mates with the thrust washer 291. Specifically, a receiving space can be provided in the thrust washer 291, with at least a portion of the thrust bearing 292 positioned within the receiving space. Please refer to Figure 9, which is an enlarged view of Section I of Figure 2. The thrust washer 291 is provided with a thrust receiving portion 2912, and the thrust bearing 292 is provided with a corresponding protruding ring portion 2922. Since the thrust washer can be made of rubber, it provides elasticity during assembly. The thrust bearing 292 can be made of graphite. In this way, at least a portion of the convex ring portion 2922 of the thrust bearing 292 can be placed within the thrust accommodating portion 2912 to achieve a connection between the thrust pad 291 and the thrust bearing 292. During operation of the canned motor pump, low-pressure liquid enters through the first opening 32 and is driven by the rotation of the impeller component 31, causing the pressure above the impeller component 31 to be greater than the pressure below. As a result, the rotor assembly is subjected to a force directed toward the impeller component, causing the rotor assembly to abut against the thrust pad 291 and transmit the force to the thrust bearing 292. The rotor assembly drives the thrust pad 291 and the thrust bearing 292 to rotate together. The thrust pad 291 is made of rubber and can provide a certain cushioning effect. The thrust bearing 292 has a first thrust surface 2921 facing the second bearing 28. Correspondingly, the second bearing 28 has a second thrust surface 282 opposing the first thrust surface 2921. The second bearing 28 can be made of ceramic, which offers excellent wear resistance, while the thrust bearing 292, made of graphite, offers excellent lubrication. During operation of the canned motor pump, the thrust bearing 292 rotates and engages with the second bearing 28, relying on the thrust surfaces facing each other. The second bearing 28 then bears the axial force of the rotor assembly.

[0049] Those skilled in the art will appreciate that the embodiment of the second rotor assembly described above is also applicable to the technical solution of the present application.

[0050] It should be noted that the directional terms such as "up", "down", "left", and "right" mentioned herein are all based on the drawings in the specification and are introduced for ease of description; as well as ordinal numbers such as "first" and "second" in the names of components, they are also introduced for ease of description and do not imply any limitation on the order of the components. In addition, since the functions of certain parts of the various components provided in the above embodiments are the same, this specification adopts a unified naming method for these parts. The above detailed introduction to the shielded pump provided by the relevant technical solution is used in this article for elaboration using specific embodiments. The description of the above embodiments is only used to help understand the method and core concept of the present invention and does not impose any form of limitation on the present invention.

Claims

1. A canned motor pump, characterized in that, It includes a shielding housing assembly (26) and a first bearing (27). The shielding housing assembly (26) includes a first shielding housing (261), a shielding cover (263), and a first bearing fixing portion (264). The first bearing (27) is fixedly connected to the first bearing fixing portion (264). The first shielding housing (261) includes a top wall portion (2613), and an opening is provided on the top wall portion (2613). The shielding cover (263) is fixedly connected to the top wall portion (2613), and the shielding cover (263) seals the opening. The first bearing fixing portion (264) is fixedly connected to one side of the top wall portion (2613) facing the inner cavity direction of the first shielding housing (261).

2. The canned motor pump according to claim 1, characterized in that, A ring-shaped protrusion portion (2611) is provided on the top wall portion (2613) facing away from the inner cavity direction of the first shielding housing (261). A shielding housing step portion (26111) is provided on the inner peripheral wall of the ring-shaped protrusion portion (2611). The shielding cover (263) abuts against the shielding housing step portion (26111) and is fixedly connected by welding.

3. The canned motor pump according to claim 2, characterized in that, The first bearing fixing portion (264) includes a connecting portion (2642) and a fixing portion (2641). The first bearing (27) is fixedly connected to the connecting portion (2642), and the fixing portion (2641) is fixedly connected to the first shielding housing (261).

4. The canned motor pump according to claim 3, characterized in that, Two or more fixing portion protrusions (26411) are provided on one side of the fixing portion (2641) close to the opening. The fixing portion protrusions (26411) abut against the side of the top wall portion (2613) close to the inner cavity and are fixedly connected by welding.

5. The canned motor pump according to any one of claims 1-4, characterized in that The first shielding housing (261) includes a small-diameter portion (261a) and a large-diameter portion (261b). The outer diameter of the large-diameter portion (261b) is greater than the outer diameter of the small-diameter portion (261a). The large-diameter portion (261b) and the small-diameter portion (261a) are of an integral structure. A first housing positioning portion (2612) is provided on the outer peripheral portion of the large-diameter portion (261b).

6. The canned motor pump according to claim 1, wherein, The canned motor pump includes a second shielding housing (262) and a second bearing (28). The second shielding housing (262) includes a second bearing fixing portion (2621). At least part of the second bearing (28) is located in the second bearing fixing portion (2621), and the second bearing (28) is fixedly connected to the second bearing fixing portion (2621).

7. The canned motor pump according to claim 6, characterized in that The second shielding housing (262) includes a second housing positioning portion (2622). An extension portion (262a) is provided on the outer periphery of the second shielding housing (262). At least part of the extension portion (262a) is coaxial with the second bearing fixing portion (2621) and extends in the same direction. The second housing positioning portion (2622) is located on the inner peripheral wall of at least part of the extension portion (262a).

8. The canned motor pump according to claim 7, wherein, The first shielding shell (261) includes a small diameter portion (261a) and a large diameter portion (261b), the outer diameter of the large diameter portion (261b) is larger than the outer diameter of the small diameter portion (261a), the large diameter portion (261b) and the small diameter portion (261a) are an integral structure, the outer periphery of the large diameter portion (261b) is provided with a first shell positioning portion (2612), and the inner diameter of the second shell positioning portion (2622) is adapted to the outer diameter of the first shell positioning portion (2612).

9. The canned motor pump according to claim 8, characterized in that, The first shell positioning portion (2612) and the second shell positioning portion (2622) are matched and fixed.

10. The canned motor pump according to claim 1, wherein, The invention comprises a first housing portion (1), a control board (15), and a heat dissipation component (14); the first housing portion (1) comprises a first main body portion (11) and a first cover portion (12); the first housing portion (1) comprises a cavity (1a); at least a portion of the control board (15) is located in the cavity (1a); The heat dissipation component (14) is fixedly connected to the first cover portion (12) to form an integrated structure; on a side of the heat dissipation component (14) facing the control board (15), at least a portion of the heat dissipation component (14) is located in the cavity (1a); the control board (15) comprises a power module (151); at least a portion of the heat dissipation component (14) located in the cavity (1a) is directly or indirectly connected to the power module (151); and on a side of the heat dissipation component (14) facing away from the control board (15), at least a portion of the heat dissipation component (14) is not covered by the first cover portion.

11. The canned motor pump according to claim 10, wherein The heat dissipation component (14) is made of metal material, and the first cover (12) is fixedly connected to the heat dissipation component (14) by injection molding to form an integrated structure.

12. The canned motor pump according to claim 11, wherein A receiving portion (121) is provided on a side of the first cover portion (12) facing away from the cavity (1a), and at least a portion of the heat dissipation component (14) is located in the receiving portion (121).

13. The canned motor pump according to claim 12, characterized in that, The first cover portion (12) comprises a accommodating opening portion (1211), and the inner diameter of the accommodating opening portion (1211) is smaller than the inner diameter of the accommodating portion (121).

14. The canned motor pump according to claim 13, wherein A step portion (142) is provided on the side of the heat dissipation component (14) facing away from the control board (15), and the step portion (142) cooperates with the accommodating portion (121).

15. The canned motor pump according to claim 10, wherein, The heat dissipation component (14) comprises a protrusion (141), the protrusion (141) is located on a side of the heat dissipation component (14) facing the control board, and at least a portion of the protrusion (141) is directly or indirectly connected to the power module (151).

16. The canned motor pump according to claim 15, characterized in that, A heat-conducting material is coated between the protruding portion (141) and the power module (151), and at least a portion of the heat-conducting material connects the heat dissipation component (14) and the protruding portion (141).

17. The canned motor pump according to claim 1, characterized in that, It comprises a first housing portion (1) and a pin assembly (165), wherein the first housing portion (1) comprises a cavity (1a), and at least a portion of the control board (15) is located in the cavity (1a); The pin assembly (165) includes a pin (16) and a pin injection molding (164). The pin injection molding (164) is fixedly connected to the pin (16) by injection molding to form an integral structure. At least part of the first housing portion (1) is fixedly connected to the pin injection molding (164) by injection molding to form an integral structure.

18. The canned motor pump according to claim 17, characterized in that, The pin (16) includes a pin body portion (163), and at least part of the pin body portion (163) is located in the pin injection molding (164).

19. The canned motor pump according to claim 18, characterized in that, The pin assembly (165) uses the pin (16) as an insert, and the pin injection molding (164) is formed by injection molding. The pin injection molding (164) at least covers part of the pin body portion (163).

20. The canned motor pump according to any one of claims 17-19, characterized in that, The canned motor pump includes a second housing portion (2). At least part of the pin (16) is located in the first housing portion (1), and at least part of the pin (16) is located in the second housing portion (2). The pin (16) includes a first end portion (161) and a second end portion (162). The first end portion (161), the second end portion (162) and the pin body portion (163) are an integral structure. At least part of the first end portion (161) is located in the first housing portion (1), and at least part of the second end portion (162) is located in the second housing portion (2).

21. The canned motor pump according to claim 20, wherein, The canned motor pump includes a control board (15). At least part of the control board (15) is located in the first housing portion (1). The control board (15) includes a reed assembly (152). The reed assembly (152) includes a first elastic portion (1521) and a second elastic portion (1522). The first elastic portion (1521) has a preset elastic force in the direction towards the second elastic portion (1522), or the second elastic portion (1522) has a preset elastic force in the direction towards the first elastic portion (1521). At least part of the first end portion (161) is located between the first elastic portion (1521) and the second elastic portion (1522), and the first elastic portion (1521) and the second elastic portion (1522) are in contact with the first end portion (161).

22. The canned motor pump according to claim 20, wherein, The second housing portion (2) includes a top wall portion (22). The top wall portion (22) is provided with a notch portion (221). The second end portion (162) can extend into the notch portion (221) so that at least part of the second end portion (162) is located in the second housing portion (2).

23. A manufacturing method of a canned motor pump, including: S1. Place at least part of the pin (16) as an insert into a first mold. The pin (16) includes a pin body portion (162), a first end portion (161), and a second end portion (162). By injection molding, a pin injection molding (164) is formed to cover at least part of the pin body portion (162) to form a pin assembly (165). S2. Place the pin component (165) into the second mold as an insert, and form at least a part of the first housing portion (1) by injection molding.

24. The manufacturing method of the canned motor pump according to claim 23, characterized in that, In the step S2, a part of the outer edge of the pin injection molding (164) can be melted, and at least a part of the outer edge of the pin injection molding (164) and a part of the first body portion are formed into an integral structure.

25. A manufacturing method of a canned motor pump, the canned motor pump includes a canned housing assembly (26) and a first bearing (27), the canned housing assembly (26) includes a first canned housing (261), a canned cover (263), and a first bearing fixing portion (264), the first canned housing (261) includes a large-diameter portion (261b) and a small-diameter portion (261a), a first housing positioning portion (2612) is provided on the outer peripheral portion of the large-diameter portion (261b), the small-diameter portion (261a) includes an inner wall (261a1), the first bearing fixing portion (264) is fixedly connected to the first canned housing (261), the first canned housing (261) has a top wall portion (2613), and an opening is provided on the top wall portion (2613), characterized in that The manufacturing method includes: S1. Position the first canned housing (261) by expanding the inner wall of the small-diameter portion (261a) with a tooling. S2. Insert the grinding head through the opening to grind the inner hole of the first bearing (27). S3. Perform turning on the first housing positioning portion (2612). Or, the manufacturing method includes: S1. Position the first canned housing (261) by expanding the inner wall of the small-diameter portion (261a) with a tooling. S2. Perform turning on the first housing positioning portion (2612). S3. Insert the grinding head through the opening to grind the inner hole of the first bearing (27).

26. The manufacturing method of the canned motor pump according to claim 25, characterized in that, The fixing method of the first bearing fixing portion (264) and the first canned housing (261) includes: Machine two or more fixing portion protrusions (26411) on one side of the fixing portion (2642) of the first bearing fixing portion (264), abut the fixing portion protrusions (26411) against the side of the top wall portion (2613) close to the cavity, and fix them by resistance welding.

27. The manufacturing method of the canned motor pump according to claim 25, the canned motor pump further includes a second canned housing (262) and a second bearing (28), and an extension portion (262a) is provided on the outer periphery of the second canned housing (262); The manufacturing method includes: S11. Clamp the outer periphery of a part of the extension portion (262a) to position the second canned housing (262). S12. Grind the inner hole of the second bearing (28). S13. Perform turning on the second housing positioning portion (2622). Or, the manufacturing method includes: S11. Clamp the outer periphery of a part of the extension portion (262a) to position the second canned housing (262). S12. Turn-machine the second housing positioning part (2622); S13. Grind the inner hole of the second bearing (28).

28. The manufacturing method of the canned motor pump according to claim 25, the canned motor pump further includes a second shield housing (262) and a second bearing (28), an extension part (262a) is arranged on the outer periphery of the second shield housing (262), and the manufacturing method includes: S21. Clamp the inner hole of the second bearing (28) with a tooling; S22. Turn-machine the second housing positioning part (2622).

29. The manufacturing method of the canned motor pump according to claim 28, wherein Comprising: Match the first housing positioning part (2622) with the second housing positioning part (2622), and assemble the first shield housing (261) and the second shield housing (262) to achieve fixation.

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