Shield pump

Abstract

A shield pump is characterized in that the shield pump comprises a shield shell assembly and a first bearing, the shield shell assembly comprises a first shield shell, a shield cover and a first bearing fixing part, the first bearing is fixedly connected with the first bearing fixing part, the first shield shell comprises a top wall part, an opening is formed in the top wall part, and the shield cover is fixedly connected with the first shield shell. The shielding cover is fixedly connected with the top wall part, the shielding cover seals the opening, and the first bearing fixing part is fixedly connected to the side, facing the inner cavity of the first shielding shell, of the top wall part. According to the shield pump provided by the embodiment, the first bearing fixing part is connected to the side, facing the inner cavity of the shell, of the top wall part, the first bearing is fixedly connected with the first bearing fixing part, the top wall part of the first shield shell is provided with the opening, operation can be conveniently carried out through the opening of the top wall part, and compared with the background technology, the shield pump is convenient to use. And further machining of the inner hole of the bearing is facilitated.

Description

Technical Field

[0001] This application relates to the technical field of water circulation systems, and particularly to a canned motor pump.

Background Art

[0002] In a domestic hot water circulation system, a water pump is required to make water flow and circulate in the system. Among them, canned motor pumps are widely used because they have relatively good sound insulation effects and are suitable for domestic scenarios. A canned motor pump usually includes a canned housing and a bearing. The bearing is located at the top wall of the inner cavity of the housing, which is not convenient for further processing of the inner hole of the bearing.

Summary of the Invention

[0003] The purpose of the present invention is to provide a canned motor pump that can facilitate the processing of the inner hole of the bearing. To this end, an embodiment of the present invention adopts the following technical solutions:

[0004] A canned motor pump, characterized in that it includes a canned housing assembly and a first bearing. The canned housing assembly includes a first canned housing, a canned cover, and a first bearing fixing part. The first bearing is fixedly connected to the first bearing fixing part. The first canned housing includes a top wall part, and an opening is provided on the top wall part. The canned cover is fixedly connected to the top wall part, and the canned cover seals the opening. The first bearing fixing part is fixedly connected to one side of the top wall part facing the inner cavity of the first canned housing.

[0005] For the canned motor pump provided in the above embodiment, the first bearing fixing part is connected to one side of the top wall part facing the inner cavity of the housing, the first bearing is fixedly connected to the first bearing fixing part, and an opening is provided on the top wall part of the first canned housing, which can facilitate the further processing of the inner hole of the bearing through the opening on the top wall part compared with the background art.

Description of the Drawings

[0006] Figure 1 is a schematic diagram of the appearance of a canned motor pump according to an embodiment of the present application;

[0007] Figure 2 is a cross-sectional view of a canned motor pump according to an embodiment of the present application;

[0008] Figure 3 is a cross-sectional view of the canned motor pump from another perspective according to an embodiment of the present application;

[0009] Figure 4 is a schematic diagram of the structure of the canned housing assembly and the bearing in cooperation according to an embodiment of the present application;

[0010] Figure 5 is a schematic diagram of the structure of the rotor assembly according to an embodiment of the present application;

[0011] Figure 6 is Figure 5 Schematic diagram of the rotor shaft structure of the rotor assembly shown

[0012] Figure 7 is Figure 5 Schematic diagram of the rotor sleeve structure of the rotor assembly shown

[0013] Figure 8 Schematic diagram of the rotor assembly structure of another embodiment of the present application

[0014] Figure 9 is Figure 2 Enlarged view of part I of

Specific Embodiment

[0015] 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 will be further described in detail below with reference to the accompanying drawings and specific embodiments.

[0016] Please refer to Figure 1 and Figure 2 and Figure 3 , where Figure 1 is the external view schematic diagram of a canned motor pump of an embodiment of the present application Figure 2 is the cross-sectional view of a canned motor pump of an embodiment of the present application Figure 3It is a cross-sectional view of another perspective of a canned motor pump according to an embodiment of the present application. The canned motor pump is located in a hot water circulation system and can use a DC synchronous motor as a driving source. It includes a first housing part 1, a second housing part 2, and a pump body part 3. One end of the first housing part 1 is connected to one end of the second housing part 2, and the pump body part 3 is connected to the other end of the second housing part 2. Among them, the first housing part 1 includes a first body part 11 and a first cover part 12. The first body part 11 and the first cover part 12 are fixedly connected, and a first sealing part 13 is arranged between the first body part 11 and the first cover part 12 to achieve sealing. The first body part 11 includes a first bottom wall part 111. The first body part 11 and the first cover part 12 generally enclose a cavity 1a. A control board 15 is fixedly arranged inside the cavity 1a, and the control board 15 is fixedly connected or limitedly connected to the first housing part 1. The fixed connection or limited connection described here can be either a direct connection. For example, a columnar protrusion can be arranged inside the first housing part. The columnar protrusion can be formed together with the first housing part during molding, and then the control board provided with an installation hole is limited by cooperating with the columnar protrusion. Of course, it can also be an indirect connection. For example, another intermediate component is fixedly connected to the first housing part, and then the control board is fixedly connected or limitedly connected to the intermediate component. That is, the fixed connection or limited connection between the control board and the first housing part recorded in the present application means that the relative positions of the two are fixed by direct or indirect means. The control board 15 is electrically connected to the motor arranged inside the second housing part 2. The control board 15 is provided with a power module 151. The power module 151 generates a large amount of heat during operation. In order to improve the heat dissipation effect, a heat dissipation component 14 can be arranged on the top of the first cover part 12. The first housing part 1 has a cavity 1a, and at least part of the control board (15) is located inside the cavity 1a. A receiving part 121 is arranged on the side of the first cover part 12 facing away from the cavity 1a, and at least part of the heat dissipation component 14 is located inside the receiving part. The first cover part 12 has a receiving opening part 1211, and the inner diameter of the receiving opening part 1211 is smaller than the inner diameter of the receiving part 121. Correspondingly, a step part 142 is arranged on the side of the heat dissipation component 14 facing away from the control board. The matching arrangement between the step part 142 and the receiving part 121 is beneficial to making the combination between the heat dissipation component 14 and the first cover part 12 more firm. During the operation of the canned motor pump, the heat energy generated by the power module 151 will have a certain impact on the heat dissipation component 14. Through the limitation of the receiving part, the heat dissipation component is not easy to break away from the first cover part. Specifically, the first cover part 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 part 12 is formed by injection molding, and the part of the first cover part 12 covering the heat dissipation component 14, or at least part of the heat dissipation component 14 is not covered by the first cover part and is exposed to the air.Meanwhile, one 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 implementation manner, the heat dissipation component 14 includes a protrusion 141, at least part of the protrusion 141 is not covered by the first cover portion, and the protrusion 141 can adopt a method of coating a heat-conducting material between the heat dissipation component and the power module, such as liquid metal, thermal conductive silicone grease, silicone rubber with a relatively high thermal conductivity, etc. At least part of the heat-conducting 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.

[0017] The control board 15 is used to convert household alternating current into a DC signal for driving the synchronous motor to drive the permanent magnet motor to rotate. At the same time, different driving modes can also be configured so that the canned motor pump can provide different speed signals to the motor according to the usage requirements of customers, enabling the impeller described below to move at the required speed.

[0018] At least part of the motor is disposed in the second housing portion 2. 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 therebetween. 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 a way of being sleeved and fixed by screws (not shown in the figure). As Figure 2 shown, a ring portion 111 is provided on the first body portion 11 of the first housing portion 1. Correspondingly, a stepped mating portion 211 is provided on the outer periphery of the upper part of the second housing portion 2. The ring portion 111 is sleeved on the outer periphery of the stepped mating portion 211, and the second sealing portion 23 is provided between the first housing portion and the second housing portion to achieve sealing. The second sealing portion 23 can adopt the structure of a sealing ring.

[0019] The control board 15 is fixedly provided with a reed 152. The reed 152 includes a first elastic part 1521 and a second elastic part 1522. The first elastic part 1521 has a preset elastic force towards the second elastic part 1522. Similarly, the second elastic part 1522 also has a preset elastic force towards the first elastic part 1521. In this way, before the pin is assembled, the first elastic part 1521 and the second elastic part 1522 can abut against each other and have a certain mutual acting force. The canned motor pump further includes a pin 16. The pin 16 includes a pin body part 163, a first end part 161 and a second end part 162. The first end part 161 of the pin 16 cooperates with the reed 152, and the reed 152 can clamp the first end part 161 of the pin 16. This fixing method is beneficial to the assembly of the pin. The relative position of the pin 16 and the first body part 11 is fixed in advance. The relative position of the reed 152 and the first body part 11 can be preset. The pin can be conveniently inserted into the reed 152 to achieve relatively stable clamping and fixing. The second end part 162 of the pin 16 can extend into the interior of the second housing and be electrically connected to the stator coil described below.

[0020] The pin 16 and the pin injection molded part 164 are fixedly connected into 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 is formed at the position of the pin body part 163 by injection molding, so as to form a pin assembly 165. Then, the pin assembly 165 as a whole is placed as an insert in the second mold, and the first body part 11 is formed by injection molding, so as to realize the integral connection of the pin 16 and the first body part 11. During the second injection molding process, a part of the outer edge of the pin injection molded part 164 can be melted, so as to be integrated with a part of the first body part 11, thus realizing a firm connection.

[0021] A notch part 221 is provided on the top wall part 22 of the second housing part 2. A part of the first body part 11 extends into the notch part 221, so that the pin 16 can be conveniently electrically connected to the stator coil at least partially located inside the second housing part 2. Similarly, the second end part 162 of the pin 16 and the stator coil can also be connected by a plug-in method.

[0022] The third housing part 3 is fixedly connected to the second housing part 2, and at least part of the impeller component 31 is located inside the third housing part 3. The third housing part 3 can be formed of cast iron material. 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 part 3 includes a first opening part 32 and a second opening part 33, and the third housing part 3 also includes an impeller cavity 34. At least part of the impeller component 31 is located in the impeller cavity 34. When the shielded pump is working, the motor drives the rotor shaft to rotate, thereby driving the impeller to rotate, sucking liquid from the first opening part 32, and doing work on the liquid, so that the liquid is accelerated and pressurized and discharged from the second opening part 33. As the shielded pump continues to operate, the liquid continues to flow in the system. In a specific use scenario, the above-mentioned liquid can be water. The impeller component 31 includes an impeller mating part 311, and the impeller mating part 311 is adapted to the second mating part of the rotor shaft described below, and the two can be fixedly connected.

[0023] 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 by screws, and the sealing ring 35 is used to achieve sealing. Figure 1 As shown, the second housing portion 2 and the third housing portion 3 can be connected by flanges and fixedly connected by screws 5 .

[0024] The second housing portion 2 is provided with a stator core 24 and a coil 25, and the stator core 24 and the coil 25 are fixed or confined inside the second housing portion 2. The stator core 24 and the coil 25 are distributed in a ring shape, and at least part of the shielding housing assembly 26 is located in the space surrounded 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 material and can be formed by integral stamping of a plate. The first shielding housing 261 has a top wall portion 2613, and the top wall portion 2613 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 blocks the opening. Specifically, in this embodiment, an annular protrusion 2611 can be provided on the top of the first shielding shell 261, which is away from the inner cavity direction of the first shielding shell, and a shielding shell step 2611 can be provided on the inner peripheral wall of the annular protrusion 2611, and the substantially plate-shaped shielding cover 263 can abut against the shielding shell step 2611, so that the two can be easily sealed and fixed by laser welding. The advantage of this matching method is that it is conducive to the processing of the first bearing described below. Before the shielding cover 263 is assembled, the first bearing located inside the first shielding shell 261 and arranged near the opening can be easily processed through the top opening of the first shielding shell 261.

[0025] The shielding housing assembly further includes a first bearing fixing portion 264. The first bearing fixing portion 264 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 to the connecting portion 2641. The fixing portion 2642 is generally plate-shaped, and the fixing portion 2642 and the first shielding housing 261 can be fixedly connected by welding. Specifically, in this embodiment, more than two fixing portion protrusions 26411 can be provided on one side of the fixing portion 2642 close to the opening, such as 5 or 6. At the same time, one side of the top wall portion 2613 of the first shielding housing 261 close to the cavity is used to abut against the fixing portion protrusions 26411, and then welding is performed. For example, after positioning the first shielding housing and the first bearing fixing portion, resistance welding can be used to achieve welded fixation.

[0026] The first shielding housing 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 can be slightly larger than the outer diameter of the rotor assembly, so that the rotor assembly can be close to the inner wall 261a1 of the small-diameter portion 261a and can rotate relative to the small-diameter portion 261a freely. 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 and the small-diameter portion can be an integrally formed structure. At least part of the large-diameter portion is arranged substantially parallel to the inner wall of the small-diameter portion. A first housing positioning portion 2612 is provided on the outer peripheral portion of the large-diameter portion. The housing positioning portion 2612 is located on at least part of the outer periphery of the large-diameter portion 261b. During processing, the inner wall 261a1 of the small-diameter portion can be used as a positioning reference, that is, the first shielding housing 261 can be fixed and positioned by expanding the inner wall 261a1 of the small-diameter portion with a tooling. Then, by grinding, the grinding head can be inserted into the inner hole 271 of the first bearing 27 from the opening at the top of the first shielding housing 261 to process the first bearing inner hole 271 of the first bearing 27. The structure of the top opening is beneficial to reducing the length of the grinding head tool bar and reducing the possibility of grinding head jitter. In addition, when the first shielding housing 261 is positioned, the first housing positioning portion 2612 can also be processed. As a specific embodiment, turning can be used for processing. In this way, during a single clamping of the first shielding housing 261, the processing of the first bearing inner hole 271 of the first bearing and the processing of the first housing positioning portion 2612 are completed. Of course, in terms of the processing sequence, either the first bearing inner hole 271 can be processed first, or the first housing positioning portion 2612 can be processed first. In this way, good coaxiality can be ensured between the first bearing inner hole 271 and the first housing positioning 2612 located on the large-diameter portion. After processing the first bearing inner hole 271 and the first housing positioning portion 2612, the shielding cover 263 is welded and sealed to the first shielding housing 261.

[0027] 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 is fixedly connected to the second bearing fixing portion 2621. The second shielding housing 262 can be made of a plate with an inner hole, such as being pre-processed into a ring-shaped plate and then stamping formed, or a middle hole can be opened in the plate after stamping to form the second shielding housing. A flanging structure is formed at the position of the middle hole portion of the second shielding housing 262, and the flanging structure forms the second bearing fixing portion 2621. After assembling the first shielding housing and the second shielding housing, the side of the second bearing fixing portion facing the first shielding housing protrudes, and at least part of the second bearing 28 is located in the inner hole of the flanging structure. The second shielding housing 262 has a second housing positioning portion 2622. Specifically, the outer periphery of the second shielding housing 262 has an extension portion 262a, and at least part of the extension portion 262a can be set to be coaxial with the second bearing fixing portion 2621 and extend in the same direction, that is Figure 4 the upward direction shown. The second housing positioning portion 2622 is located on the inner peripheral wall of at least part of the extension portion 262a. During processing, it can be clamped on the outer periphery of part of the extension portion 262a, and then the inner hole 281 of the second bearing 28 is ground, and the second housing positioning portion 2622 is turned. In this way, the inner hole 281 of the second bearing and the second housing positioning portion 2622 have relatively good coaxiality. Among them, the inner hole 281 of the second bearing can be processed first, or the second housing positioning portion 2622 can be processed first. Of course, it is not limited to the above clamping and processing methods, and it can also be clamped in the inner hole 281 of the second bearing, and then the second housing positioning portion 2622 is processed by turning.

[0028] The inner edge portion of the extension portion 262a, that is, the inner diameter of the second housing positioning portion 2622 is adapted to the outer diameter of the first housing positioning portion 2612. During assembly, part of the extension portion 262a is sleeved on the large-diameter portion 261b, so that the first housing positioning portion 2612 and the second housing positioning portion 2622 are matched. Taking the first housing positioning portion 2612 as a reference, the inner hole 281 of the second shaft hole can have good coaxiality with the first housing positioning portion 2612, so that good coaxiality is achieved between the inner hole 281 of the second bearing and the inner hole 271 of the first bearing.

[0029] The following combines Figures 5 - 7 , and describes the structure of the rotor assembly of an embodiment of the present application. Please refer to Figures 5 - 7 , where Figure 5 is a schematic structural diagram of the rotor assembly of an embodiment of the present application; Figure 6 is Figure 5 a schematic structural diagram of the rotor shaft of the rotor assembly shown; Figure 7 is Figure 5Schematic diagram of the rotor sleeve structure of the rotor assembly shown. 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 sleeved on the outer periphery of the rotor sleeve 42, and an annular space is formed between the two. The magnetic ring 45 is located in the annular space, and the ends of the rotor shield and the rotor sleeve 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. Among them, as a specific embodiment, the first baffle portion 431 includes a first inner abutting portion 4311, a first outer abutting portion 4312, and a magnetic ring limiting portion 4313. The first baffle portion 431 is generally annular and can be an integral structure. The first inner abutting portion 4311 and the first outer abutting portion 4312 extend in the same direction relative to the magnetic ring limiting portion 4313, and the magnetic ring limiting portion 4313 can limit the magnetic ring 45. The first baffle portion 431 and the rotor sleeve 42 and the rotor shield 44 can be connected by laser welding. The second baffle portion 431 can have the same structure as the first baffle portion 431. While being able to limit the magnetic ring 45, it is fixed to the rotor sleeve 42 and the rotor shield 44 by laser welding. In this way, the magnetic ring 45 is limited in a relatively closed space. The rotor baffle 43, the rotor sleeve 42, the rotor shield 44, and the magnetic ring 42 constitute at least part of the magnetic ring assembly. In a specific embodiment, the material thickness of the first baffle portion 431 and the second baffle portion 432 can be selected to be no more than 1 mm. In order to achieve laser welding and ensure the press-fitting accuracy, the first baffle portion 431 and the second baffle portion 432 can be press-fitted with interference. Taking the first baffle portion 431 as an example, the fitting dimensions between the first inner abutting portion 4311 and the outer peripheral wall of the rotor sleeve 42 and between the first outer abutting portion 4312 and the inner peripheral wall of the rotor shield 44 can be designed as interference fits. In this way, since the thickness of the first baffle portion 431 is small and both the first outer abutting portion and the first inner abutting portion have a certain elasticity, it is beneficial to reduce the dimensional accuracy requirements for the first baffle portion 431.

[0030] Of course, the above first baffle portion 431 and second baffle portion 432 are just a specific embodiment. To limit the magnetic ring 45, it does not mean that only the above specific structures of the first baffle portion 431 and the second baffle portion 432 can be used. For example, the first baffle portion 431 may not be provided with the first outer abutting portion and the first inner abutting portion. As long as it can ensure that the magnetic ring is limited in a relatively independent space and can be hermetically fixed to the rotor sleeve 42 and the rotor shield 44, it will not be elaborated here.

[0031] Please refer toFigure 7 , the rotor sleeve 42 is generally tubular, and a sleeve groove portion 421 is provided on the inner wall of the rotor sleeve 42. The number and shape of the sleeve groove portion 421 are not limited. In a specific embodiment, the sleeve groove portion 421 may be located at both ends of the inner peripheral wall of the rotor sleeve 42 and extend to the end face of the inner peripheral wall. The material of the rotor sleeve may be a material such as non-magnetic stainless iron with good magnetic conductivity, or a non-magnetic stainless steel material may also be selected. In this way, the sleeve groove portion 421 is relatively convenient to process. For example, the sleeve groove portion can be formed by cutting on the end face of the rotor sleeve.

[0032] The rotor shaft 41 can be made of ceramic material. The outer diameter of the rotor shaft is smaller than the inner diameter of the rotor sleeve 42. The rotor shaft 41 includes a first fitting portion 412 and a second fitting portion 413. The first fitting portion 412 is located on the outer peripheral wall of one end of the rotor shaft 41, and the second fitting portion 413 is located on the outer peripheral wall of the other end of the rotor shaft 41. Among them, the first fitting portion 412 is used to cooperate with the first bearing inner hole 271 described above, and the rotor shaft 41 can rotate relative to the first bearing inner hole 271. The second fitting portion 413 is used to be fixedly connected to the impeller component 31. Specifically, the second fitting portion 413 is fixedly connected to the impeller fitting portion 311. In this way, when the rotor shaft 41 rotates, it can drive the impeller component to rotate. The rotor shaft 41 includes a through hole portion 414. In this way, during the use of the canned motor pump, water can flow along the through hole portion 414 and achieve pressure balance at both ends of the rotor shaft. A rotor shaft fitting portion 415 is provided on the outer peripheral wall of the rotor shaft 41 near one end of the second fitting portion 413, and at least part of the rotor shaft fitting portion 415 can rotate in cooperation with the second bearing 28.

[0033] The outer peripheral wall of the rotor shaft 41 is provided with a rotor shaft groove portion 411, and the number of the rotor shaft groove portions 411 may not be 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 described herein refers to an assembly formed by at least including the rotor baffle 43, the rotor sleeve 42, the rotor shield 44, and the magnetic ring 42 described above. As a specific implementation manner, the magnetic ring assembly and the rotor shaft can be placed in a specific mold, and the magnetic ring assembly and the rotor shaft are coaxially placed. Since the outer diameter of the rotor shaft 41 is smaller than the inner diameter of the rotor sleeve 42, an annular space is formed therebetween for the inflow of the injection molding material. During injection molding, the injection molding material flows into the annular space between the magnetic ring assembly and the rotor shaft to form an injection molded body 46. Since the inner peripheral wall of the rotor sleeve of the magnetic ring assembly is provided with a sleeve groove portion 421, when at least part of the sleeve groove portion 421 is filled with the injection molding material, the injection molded body 46 can be tightly connected to the rotor sleeve 42 and is not easily separated. At the same time, since the outer peripheral wall of the rotor shaft 41 is provided with a rotor shaft groove portion 411, during injection molding, the injection molding material can flow into and fill at least part of the rotor shaft groove portion 411, so that a tight and firm connection is formed between the injection molded body 46 and the rotor shaft 41 and is not easily detached. After the injection molding is completed, the magnetic ring assembly, the rotor shaft, and the injection molded body are fixedly connected into one body to form a rotor assembly 4. Of course, those skilled in the art can understand that under the inspiration of the above embodiments, various changes or substitutions can also be made to the sleeve groove portion 421 of the rotor sleeve 42. For example, an axially penetrating groove is provided on the inner wall of the rotor sleeve, and the same purpose of increasing the connection strength between the injection molded body and the rotor sleeve can also be achieved.

[0034] Next, in conjunction with Figure 8 , the structure of the rotor assembly according to another embodiment of the present application will be described.

[0035] The rotor assembly 40 includes a rotor shaft 401, a rotor sleeve 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 sleeve is generally tubular. The outer diameter of the rotor sleeve 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 is adapted to the outer diameter of the rotor sleeve 402, and the outer diameter of the magnetic ring 405 is adapted to the inner diameter of the rotor shield 404. The magnetic ring 405 is located outside the stator core 406, and both are limited between the rotor sleeve 402 and the rotor shield 404. The two ends of the rotor sleeve 402 and the rotor shield 404 are blocked 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 limiting portion 40313. The first baffle portion 4031 can be made by integral stamping. Taking the limiting 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 limiting portion 40313 to facilitate welding. The first baffle portion 4031 and the rotor sleeve 402 and the rotor shield 404 can be fixedly connected by laser welding. The limiting portion 40313 can limit the stator core 406 and the magnetic ring 405. In a specific embodiment, the material thickness of the first baffle portion 4031 and the second baffle portion 4032 can be selected to be no more than 1 mm. In order to achieve laser welding and ensure the press-fitting accuracy, the first baffle portion 4031 and the second baffle portion 4032 can be press-fitted with interference. Taking the first baffle portion 4031 as an example, the fitting dimensions between the first inner abutting portion 40311 and the outer peripheral wall of the rotor sleeve 402 and between the first outer abutting portion 40312 and the inner peripheral wall of the rotor shield 404 can be designed as interference fits. In this way, since the thickness of the first baffle portion 4031 is small and both the first outer abutting portion and the first inner abutting portion have a certain elasticity, it is beneficial to reduce the dimensional accuracy requirements for the first baffle portion 4031.

[0036] The second baffle portion 4031 can have the same structure as the first baffle portion 4031 and be fixed to the rotor sleeve 402 and the rotor shield 404 by laser welding. In this way, the rotor sleeve, the rotor shield, the first baffle portion, and the second baffle portion define a generally annular space, and the stator core and the magnetic ring are limited within the space, thereby forming at least part of the rotor assembly. It should be noted that the rotor assembly does not necessarily consist of only the above 4 components. Without affecting the basic performance, other components can be added, and these structural changes should not deviate from the scope claimed in this application.

[0037] Similar to the first embodiment of the rotor assembly described above, the first baffle portion 4031 and the second baffle portion 4032 are just a specific implementation manner. To achieve the limit of the magnetic ring 45, it does not mean that only the above specific structures of the first baffle portion 4031 and the second baffle portion 4032 can be adopted. For example, the first baffle portion 4031 may not be provided with the first outer abutting portion and the first inner abutting portion. As long as the magnetic ring can be limited in a relatively independent space and can be hermetically fixed between the rotor sleeve 402 and the rotor shield sleeve 404, it will not be elaborated here.

[0038] The rotor shaft 401 can be made of ceramic material. The outer diameter of the rotor shaft 401 is adapted to the inner diameter of the rotor sleeve 402. The rotor shaft 401 includes a first fitting portion 4012 and a second fitting portion 4013. The first fitting portion 4012 is located on the outer peripheral wall at one end of the rotor shaft 401, and the second fitting portion 4013 is located on the outer peripheral wall at the other end of the rotor shaft 401. Among them, the first fitting portion 4012 is used to cooperate with the first bearing inner hole 271 described above, and the rotor shaft 401 can rotate relative to the first bearing inner hole 2071. The second fitting portion 4013 is used to be fixedly connected with the impeller component described below. In this way, when the rotor shaft 401 rotates, it can drive the impeller component to rotate. The rotor shaft 401 includes a through-hole portion 4011. In this way, during the use of the canned motor pump, water can flow along the through-hole portion 4011, and pressure balance can be achieved at both ends of the rotor shaft. The rotor shaft 401 is provided with a rotor shaft fitting portion 4015 on the outer peripheral wall at one end close to the second fitting portion 4013, and at least part of the rotor shaft fitting portion 4015 can rotate and cooperate with the second bearing 28.

[0039] The outer diameter of the rotor shaft 401 is adapted to the inner diameter of the rotor sleeve 402. The two can be in a tight fit or an interference fit. For example, the rotor sleeve 402 and the rotor shaft 401 can be designed to be in an interference fit and then fixed by welding. In a specific embodiment, the rotor shaft 401 can be made of ceramic material, and the rotor sleeve 402 can be made of stainless steel material. When implementing welding, first fix the rotor sleeve 402 and the rotor shaft 401 by interference press-fitting, and then place a filler metal at the contact part of the two. After heating, the filler metal melts to achieve welding fixation. Or first position the rotor sleeve 402 and the rotor shaft 401 by interference fit, then place a filler metal at the contact part of the two, and after high-temperature heating, the filler metal melts to achieve welding fixation. The filler metal can specifically adopt a silver-containing solder paste, and titanium element is added thereto. This filler metal is beneficial to the welding between ceramic and metal materials. During specific welding, the furnace welding method can be adopted. First, fix the rotor sleeve and the rotor shaft in cooperation and place the filler metal. The filler metal is placed at the joint part of the two, such as Figure 8The A part shown is placed in a tunnel furnace and heated at high temperature to complete welding. After the rotor sleeve and the rotor shaft are welded, the stator core, the magnetic ring, the rotor shield sleeve, the first baffle part and the second baffle part can be assembled. After assembly, at the joint between the first baffle part and the rotor shield sleeve, such as Figure 8 the B2 part shown, welding fixation can be adopted, for example, laser welding can be used to achieve welding fixation; at the joint between the first baffle part and the rotor sleeve, such as Figure 8 the B1 part shown, welding fixation can be adopted, for example, laser welding can be used to achieve welding fixation. There is no restriction on the welding sequence of the B1 and B2 parts.

[0040] The structures and manufacturing methods of the rotor assemblies of the two embodiments are described in detail above. Next, the installation structure of the rotor assembly will be described in conjunction with Figure 2 、 Figure 3 The installation structure of the rotor assembly will be described. Figure 2 and Figure 3 The canned motor pumps corresponding to are Figure 5 The rotor assemblies corresponding to, and the rotor assembly corresponding to will be taken as an example for description below. Figure 5 The rotor assembly corresponding to will be taken as an example for description.

[0041] Below the magnetic ring assembly of the rotor assembly, that is, the part of the rotor shaft 41 closer to the second mating part, a thrust pad 291 and a thrust bearing 292 are provided. Among them, the thrust pad 291 can be made of rubber material. The thrust pad 291 is closer to the magnetic ring assembly than the thrust bearing 292, or closer to the rotor sleeve 42. The thrust bearing 292 cooperates with the thrust pad 291. Specifically, a receiving space can be provided on the thrust pad 291, and at least part of the thrust bearing 292 is arranged in the receiving space. Please refer to Figure 9 , Figure 9 is Figure 2Enlarged view of part I. The thrust washer 291 is provided with a thrust receiving portion 2912. Correspondingly, the thrust bearing 292 is provided with a convex ring portion 2922. During assembly, since the thrust washer can be made of rubber material and has elasticity. And the thrust bearing 292 can be made of graphite material. In this way, at least part of the convex ring portion 2922 of the thrust bearing 292 can be placed into the thrust receiving portion 2912 to realize the connection between the thrust washer 291 and the thrust bearing 292. During the working process of the canned motor pump, after the low-pressure liquid enters from the first opening 32, driven by the rotation of the impeller component 311, the pressure above the impeller component is greater than the pressure below. Therefore, the rotor assembly will be subjected to a force towards the impeller component direction, the rotor assembly abuts against the thrust washer 291 and transmits the force to the thrust bearing 292. The rotor assembly drives the thrust washer 291 and the thrust bearing 292 to rotate together. The thrust washer 291 is made of rubber material and can play a certain buffering role. The thrust bearing 292 is provided with a first thrust surface 2921 facing the second bearing 28. Correspondingly, the second bearing 28 is provided with a second thrust surface 282 opposite to the first thrust surface 2921. The second bearing 28 can be made of ceramic material and has good wear resistance, while the thrust bearing 292 made of graphite material has good lubrication performance. During the working process of the canned motor pump, relying on the thrust surfaces of the thrust bearing 292 and the second bearing 28 arranged oppositely, the thrust bearing 292 fits with the second bearing 28 while rotating, and the second bearing 28 bears the axial force of the rotor assembly.

[0042] Those skilled in the art can understand that the above-described second embodiment of the rotor assembly can also be applied to the technical solution of the present application.

[0043] It should be noted that the above-mentioned orientation nouns such as up, down, left, and right are introduced for the convenience of description based on the accompanying drawings of the specification; and the ordinal numbers such as "first" and "second" in the component names are also introduced for the convenience of description and do not mean any limitation on the order of the components. In addition, since the functions of some parts of the components provided in the above embodiments are the same, the present specification uses a unified naming method for these parts. The above has introduced the canned motor pump provided by the related technical solution in detail, and specific embodiments are used in this article for elaboration. The description of the above embodiments is only used to help understand the method and its core idea of the present invention, and does not impose any formal 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). 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 of the first shielding housing.

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

3. The canned motor pump according to claim 2, wherein The first bearing fixing portion (264) includes a connecting portion (2641) and a fixing portion (2642). The first bearing (27) is fixedly connected to the connecting portion (2641), and the fixing portion (2642) 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 (2642) 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, characterized in that 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, 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 that 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). The inner diameter of the second housing positioning portion (2622) is adapted to the outer diameter of the first housing positioning portion (2612).

9. The canned motor pump according to claim 8, wherein The first housing positioning portion (2612) and the second housing positioning portion (2622) are fixedly engaged with each other.

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