Magnetic pump

Abstract

The present invention discloses a magnetic pump, which comprises: a pump head, which is hollow inside and has an open end to form a receiving cavity. The pump head is also provided with a liquid inlet end and a liquid outlet end communicated with the receiving cavity; an isolation cover, which is covered on the open end to seal the open end; a shaft core, which is located in the receiving cavity. One end of the shaft core abuts against the isolation cover and the other end is fixedly arranged on the pump head; an impeller, which is located in the receiving cavity and is rotatably arranged on the shaft core; an inner magnetic assembly, which is arranged on the impeller; an outer magnetic assembly, which is connected to the output shaft of the motor to be driven by the motor to rotate; wherein, the isolation cover is located in the receiving cavity, the isolation cover has a limiting part which abuts against one end part of the shaft core, and the pump head is provided with a support hole position which cooperates with the other end part of the shaft core; the liquid inlet end and the support hole position are arranged on the wall surface of the pump head perpendicular to the shaft core, the support hole position is communicated with the liquid inlet end, the shaft core is provided with a core hole axially penetrating through it, and a diversion channel is recessed on the limiting part, and the diversion channel communicates one end of the core hole with the receiving cavity.

Description

Technical Field

[0001] The present invention relates to the technical field of pumps, and particularly to a magnetic pump. Background Art

[0002] A magnetic pump is a pump that applies the principle of permanent magnet drive technology to achieve non-contact transmission of torque. There is no mechanical connection between the driving shaft and the driven shaft, and there is no need to consider the problem of dynamic sealing, which is widely used in various industries. In the prior art, support structures are provided at both ends of the shaft core inside the magnetic pump for support, resulting in a relatively large axial span of the magnetic pump and a large occupied space in the axial direction. Therefore, it is necessary to improve the prior art to overcome the above-mentioned defects in the prior art. Summary of the Invention

[0003] The purpose of the present invention is to provide a magnetic pump with a compact structure.

[0004] The purpose of the present invention is achieved through the following technical solutions:

[0005] A magnetic pump, comprising: a pump head, which is hollow inside and has an open end to form a receiving cavity with an open mouth. The pump head is also provided with a liquid inlet end and a liquid outlet end communicating with the receiving cavity; an isolation cover, covering the open mouth to close the open mouth; a shaft core, located inside the receiving cavity, with one end of the shaft core abutting against the isolation cover and the other end fixed to the pump head; an impeller, located inside the receiving cavity and rotatably arranged on the shaft core; an inner magnetic assembly, arranged on the impeller; an outer magnetic assembly, connected to the output shaft of the motor to be driven to rotate by the motor. Among them, the isolation cover is located inside the receiving cavity, the isolation cover has a limiting portion abutting against one end of the shaft core, and the pump head is provided with a support hole position cooperating with the other end of the shaft core; the liquid inlet end and the support hole position are arranged on the wall surface of the pump head perpendicular to the shaft core, the support hole position communicates with the liquid inlet end, the shaft core is provided with a core hole axially penetrating through it, and a diversion channel is recessed on the limiting portion, and the diversion channel communicates one end of the core hole with the receiving cavity.

[0006] Preferably, the impeller includes an impeller main body and a mounting ring portion fixedly arranged at the outer edge of the impeller main body and extending axially. An impeller cavity is formed by surrounding the impeller main body and the mounting ring portion;

[0007] The isolation cover includes a sleeve-shaped main body portion and a convex ring portion located at one end of the main body portion. The main body portion is located inside the impeller cavity, and the convex ring portion abuts against the open mouth;

[0008] The inner magnetic assembly is arranged on the mounting ring portion, and the outer magnetic assembly is located inside the main body portion.

[0009] Preferably, the liquid inlet end includes a first liquid inlet that communicates with the support hole position and is coaxially distributed, and a plurality of second liquid inlets that communicate with the accommodation cavity and are distributed on the outer periphery of the first liquid inlet. Among them, the plurality of second liquid inlets are configured to deliver liquid to the impeller.

[0010] Preferably, a second channel that communicates the liquid outlet area of the accommodation cavity and the second liquid inlet is further provided in the pump head. The second channel includes an axially extending channel and a radially extending channel that are connected. The axially extending channel communicates with the liquid outlet area of the accommodation cavity, and the radially extending channel communicates with the second liquid inlet. Among them, a first external connection port is formed on the outer surface of the pump head for the radially extending channel, and a first sealing plug is operably placed in the first external connection port.

[0011] Preferably, a first channel that communicates the second liquid inlet and the support hole position is further provided in the pump head. The first channel extends radially or in a direction that forms an acute angle with the radial direction.

[0012] Preferably, the impeller is provided on the shaft core through a bearing assembly. The bearing assembly includes a pair of sliding bearings inserted into the central hole of the impeller, a bearing collar inserted into the pair of sliding bearings and sleeved on the shaft core, and a pair of thrust rings sleeved on the shaft core and abutting against both ends of the bearing collar;

[0013] Among them, the shaft core includes an abutting end and a smooth shaft fixed on the abutting end. The bearing collar and the pair of thrust rings are respectively sleeved on the smooth shaft;

[0014] The pair of thrust rings includes a first thrust ring located between the bearing collar and the abutting end, and a second thrust ring located between the bearing collar and the pump head. A first limiting groove is axially recessed at the orifice of the support hole position. The second thrust ring has a first boss that cooperates with the first limiting groove;

[0015] A second limiting groove that cooperates with the end of the bearing collar is axially recessed on the surface of the second thrust ring facing away from the first boss; a third limiting groove that cooperates with the end of the bearing collar is axially recessed on the surface of the first thrust ring away from the abutting end.

[0016] Preferably, the diameters of both ends of the smooth shaft are larger than the diameter of the middle region, so that there is a radial gap between the outer wall of the middle region of the smooth shaft and the inner wall of the bearing collar, thereby forming a third channel extending axially between the smooth shaft and the bearing collar;

[0017] Among them, the third channel communicates with the liquid inlet end.

[0018] Preferably, a preset gap exists between the pair of sliding bearings in the axial direction, and the preset gap enables a liquid storage space to exist between the pair of sliding bearings. A communication hole extending radially is provided on the circumferential wall surface of the bearing race corresponding to the liquid storage space, and the communication hole communicates the liquid storage space with the third channel.

[0019] Preferably, a seal is provided between the isolation cover and the pump head, and a groove for cooperating with the seal is provided on the pump head;

[0020] The seal includes an outer ring deformation ring, an inner ring deformation ring provided inside the outer ring deformation ring, a first seal ring and a second seal ring provided between the outer ring deformation ring and the inner ring deformation ring, and a biasing member abutted between the first seal ring and the second seal ring. Among them, the biasing member is configured to make the first seal ring and the second seal ring be in a state of moving away from each other.

[0021] Preferably, the pump head is connected to the housing of the motor through a bracket, and the isolation cover is clamped between the pump head and the bracket;

[0022] Among them, the outer magnetic assembly is provided on the connecting member, and a space for accommodating the connecting member is formed by surrounding the bracket and the isolation cover.

[0023] Compared with the prior art, the present invention has the following beneficial effects:

[0024] In the present invention, the rear end support of the shaft core can be realized through the isolation cover. Therefore, there is no need to separately provide a rear end support structure for the rear end of the shaft core. While simplifying the internal structure of the magnetic pump, the stress condition of the shaft core is also improved;

[0025] A diversion channel is recessed on the limiting portion, and the diversion channel communicates the rear end of the core hole with the accommodating cavity. Thus, the liquid can enter the core hole through the liquid inlet end and then enter the accommodating cavity through the diversion channel. The above flow path of the liquid can take away part of the heat of the shaft core and the bearing assembly, which is beneficial to the internal cooling of the magnetic pump. BRIEF DESCRIPTION OF THE DRAWINGS

[0026] Figure 1 is a three-dimensional structural schematic diagram of the magnetic pump provided by the present invention;

[0027] Figure 2 is a cross-sectional structural schematic diagram of the magnetic pump provided by the present invention;

[0028] Figure 3 is an exploded structural schematic diagram of the magnetic pump provided by the present invention;

[0029] Figure 4 is a three-dimensional structural schematic diagram of the pump head;

[0030] Figure 5 Schematic three-dimensional structure diagram of the impeller from the first perspective;

[0031] Figure 6 Schematic three-dimensional structure diagram of the impeller from the second perspective;

[0032] Figure 7 Schematic three-dimensional structure diagram of the isolation cover;

[0033] Figure 8 Schematic cross-sectional structure diagram of the isolation cover;

[0034] Figure 9 Schematic cross-sectional structure diagram of the bearing assembly;

[0035] Figure 10 Schematic three-dimensional structure diagram of the bearing ring;

[0036] Figure 11 Schematic three-dimensional structure diagram of the shaft core;

[0037] Figure 12 Schematic three-dimensional structure diagram of the thrust ring from the first perspective;

[0038] Figure 13 Schematic three-dimensional structure diagram of the thrust ring from the second perspective;

[0039] Figure 14 Schematic cross-sectional structure diagram of the seal. Detailed implementation manners

[0040] To make the above objects, features, and advantages of the present application more obvious and understandable, the following will describe in detail the specific implementation manners of the present application with reference to the accompanying drawings. It can be understood that the specific embodiments described herein are only used to explain the present application and are not intended to limit the present application. Additionally, it should be noted that for the sake of convenience of description, only the parts related to the present application rather than all the structures are shown in the drawings. Based on the embodiments in the present application, all other embodiments obtained by those of ordinary skill in the art without creative efforts fall within the scope of protection of the present application.

[0041] The terms "including" and "having" and any variations thereof in the present application are intended to cover non-exclusive inclusion. For example, a process, method, system, product, or device that includes a series of steps or units is not limited to the listed steps or units, but may optionally further include steps or units not listed, or may optionally further include other steps or units inherent to these processes, methods, products, or devices.

[0042] Reference to "embodiments" in this specification means that the specific features, structures, or characteristics described in connection with the embodiments can be included in at least one embodiment of the present application. The phrase appears in various places in the specification and does not necessarily refer to the same embodiment each time, nor is it an independent or alternative embodiment mutually exclusive with other embodiments. Those skilled in the art will explicitly and implicitly understand that the embodiments described herein can be combined with other embodiments.

[0043] As Figures 1 to 3 shown, the present invention provides a magnetic pump, which includes a pump head 100, an impeller 200, an isolation cover 300, a bracket 720, an inner magnetic assembly 600, an outer magnetic assembly 700, and a motor 800. Among them, the bracket 720 connects the housing of the motor 800 to the pump head 100, and the isolation cover 300 is clamped between the pump head 100 and the bracket 720. Thus, there is no need to connect between the isolation cover 300 and the pump head 100, and between the isolation cover 300 and the bracket 720 through fasteners (not shown in the figure), which simplifies the installation steps of the magnetic pump and reduces the processing complexity of the isolation cover 300 at the same time.

[0044] As Figure 4 shown, the pump head 100 is hollow inside and open at one end to form a receiving cavity 110 with an open end. The isolation cover 300 is located inside the receiving cavity 110 and covers the open end to close the open end. The isolation cover 300 is located inside the pump head 100, which can effectively reduce the axial span of the magnetic pump and is very beneficial for reducing the axial dimension.

[0045] An axle core 400 and an impeller 200 are provided in the receiving cavity 110. The impeller 200 is rotatably arranged on the axle core 400 through a bearing assembly 500. The pump head 100 is also provided with a liquid inlet end 120 and a liquid outlet end 130 communicating with the receiving cavity 110. When the impeller 200 rotates, the liquid is sucked into the receiving cavity 110 through the liquid inlet end 120 and finally pumped out through the liquid outlet end 130. It should be noted that the axial and radial directions in this embodiment refer to the axial direction of the axle core 400.

[0046] As Figure 5 and Figure 6 shown, the impeller 200 includes an impeller main body 210 and a mounting ring portion 220 fixedly arranged at the outer edge of the impeller main body 210 and extending axially. The impeller main body 210 and the mounting ring portion 220 enclose an impeller cavity 230, and the inner magnetic assembly 600 is arranged on the inner side wall of the mounting ring portion 220 and is located inside the impeller cavity 230.

[0047] As Figure 7 and Figure 8As shown, the isolation cover 300 includes a sleeve-shaped main body portion 320 located within the impeller chamber 230 and a convex ring portion 330 located at the rear end of the main body portion 320. Among them, the convex ring portion 330 is a flanging structure formed at the rear end of the main body portion 320, and the convex ring portion 330 abuts against the open end, playing a role of installation limit.

[0048] As Figure 2 shown, the outer magnetic component 700 and the inner magnetic component 600 are respectively located on the inner and outer sides of the main body portion 320 of the isolation cover 300. Among them, the outer magnetic component 700 is located within the main body portion 320, and the inner magnetic component 600 is located outside the main body portion 320.

[0049] The outer magnetic component 700 is connected to the output shaft of the motor 800 to be driven to rotate by the motor 800. Specifically, the motor 800 has an output shaft 810, and a connecting member 710 is connected to the output shaft 810. The outer magnetic component 700 is provided on the connecting member 710, and the connecting member 710 is located inside the bracket 720.

[0050] In order for the outer magnetic component 700 to better cooperate with the inner magnetic component 600, a part of the connecting member 710 extends into the main body portion 320. That is to say, the connecting member 710 is located in the space formed by enclosing the bracket 720 and the isolation cover 300. The outer magnetic component 700 is provided on the outer side wall of the region section of the connecting member 710 located within the main body portion 320, so that the outer magnetic component 700 and the inner magnetic component 600 are flush with each other in the axial direction. Thus, it is not only beneficial to the magnetic force between the outer magnetic component 700 and the inner magnetic component 600, but also can reduce the size of the magnetic pump in the axial direction.

[0051] Regarding the installation limit of the shaft core 400, one end of the shaft core 400 abuts against the isolation cover 300, and the other end is fixedly provided on the pump head 100. For the convenience of describing the positional relationship between each component, with the pump head 100 and the motor 800 as references, the pump head 100 is located at the front end of the magnetic pump, and the motor 800 is located at the rear end of the magnetic pump. That is to say, the front end of the shaft core 400 is fixedly provided on the pump head 100, and the rear end abuts against the isolation cover 300.

[0052] Specifically, a support hole position 140 matching the front end portion of the shaft core 400 is provided on the inner wall surface of the pump head 100, and the front end portion of the shaft core 400 is inserted into the support hole position 140. The isolation cover 300 has a limiting portion 310 that abuts against the rear end portion of the shaft core 400. The shape of the limiting portion 310 is not limited. It can be a structure protruding from the wall surface of the isolation cover 300, or a structure recessed from the wall surface of the isolation cover 300, as long as it can abut against the rear end portion of the shaft core 400.

[0053] In the prior art, a rear support structure is usually provided at the rear end of the shaft core 400, and the installation and limitation of the shaft core 400 are realized through the supports at the front and rear ends. In this solution, the isolation cover 300 is fully utilized to realize the rear support of the shaft core 400. Thus, there is no need to separately provide a rear support structure, which simplifies the internal structure of the magnetic pump and improves the stress condition of the shaft core 400, avoiding a cantilever structure.

[0054] Further, as Figure 2 , Figure 4 and Figure 8 shown, the support hole position 140 is located on the inner side wall surface of the pump head 100 perpendicular to the shaft core 400, and the liquid inlet end 120 is also located on the above-mentioned wall surface of the pump head 100. The support hole position 140 is communicated with the liquid inlet end 120. The shaft core 400 is provided with a core hole 410 axially penetrating therethrough. Considering that the limiting portion 310 abuts against the rear end of the shaft core 400, in order to enable the liquid to flow smoothly, a diversion channel 311 is recessed on the limiting portion 310, and the diversion channel 311 communicates the rear end of the core hole 410 with the accommodation cavity 110. Thus, the liquid can enter the core hole 410 via the liquid inlet end 120 and then enter the accommodation cavity 110 through the diversion channel 311. The above-mentioned flow path of the liquid can take away part of the heat of the shaft core 400 and the bearing assembly 500, which is beneficial to the internal cooling of the magnetic pump.

[0055] The liquid inlet end 120 includes a first liquid inlet 121 communicated with the above-mentioned support hole position 140 and coaxially distributed, and a plurality of second liquid inlets 122 communicated with the accommodation cavity 110 and distributed on the outer periphery of the first liquid inlet 121. Among them, the plurality of second liquid inlets 122 are used to convey the liquid to the impeller 200. The above-mentioned setting manner of the liquid inlet end 120 can realize the diversion of the liquid to meet the liquid inlet requirements of the impeller 200 and the core hole 410.

[0056] In order to enable the liquid in the magnetic pump to circulate better, a second channel 160 communicating the liquid outlet area of the accommodation cavity 110 and the second liquid inlet 122 is further provided in the pump head 100. Among them, the liquid outlet area of the accommodation cavity 110 is the area of the accommodation cavity 110 close to the liquid outlet end 130. Due to the relatively high pressure at the liquid outlet end 130, the liquid in the liquid outlet area can quickly enter the second liquid inlet 122 through the second channel 160.

[0057] The second channel 160 includes an axially extending channel 162 and a radially extending channel 161 that are in communication with each other. Among them, the axially extending channel 162 communicates with the liquid outlet area of the receiving cavity 110, and the radially extending channel 161 communicates with the second liquid inlet 122. The above-mentioned axially extending channel 162 refers to extending substantially along the axial direction or having an acute angle with the axial direction; similarly, the radially extending channel 161 refers to extending substantially along the radial direction or having an acute angle with the radial direction. It should be noted that in this specification, "substantially" can be understood as close to, approximate, or within a predetermined range of the target value.

[0058] In one embodiment, as Figure 2 shown, the radially extending channel 161 forms a first external connection port 163 on the outer surface of the pump head 100, and a first sealing plug (not shown in the figure) is operably placed in the first external connection port 163. When the first sealing plug is removed, other external liquids can enter the receiving cavity 110 through the second liquid inlet 122. A second external connection port 164 is further provided at the bottom of the pump head 100, and the central axis of the second external connection port 164 is parallel to the central axis of the first liquid inlet 121. A second sealing plug (not shown in the figure) is operably placed in the second external connection port 164. When the magnetic pump is not in use, the second sealing plug is removed, and the liquid in the receiving cavity 110 can be discharged to the external environment through the second external connection port 164, avoiding liquid retention in the receiving cavity 110.

[0059] Regarding the bearing assembly 500, as Figure 9 shown, the bearing assembly 500 includes a pair of sliding bearings 520 inserted into the central hole 240 of the impeller 200, a bearing collar 510 inserted into the pair of sliding bearings 520 and sleeved on the shaft core 400, and a pair of thrust rings 530 sleeved on the shaft core 400 and abutting against both ends of the bearing collar 510.

[0060] As Figure 11 shown, the shaft core 400 includes an abutting end 420 and a smooth shaft 430 fixed to the abutting end 420, and the bearing collar 510 and the pair of thrust rings 530 are respectively sleeved on the smooth shaft 430. Among them, the pair of thrust rings 530 includes a first thrust ring located between the bearing collar 510 and the abutting end 420 and a second thrust ring located between the bearing collar 510 and the pump head 100.

[0061] As Figure 2 , Figure 4 , Figure 12 , Figure 13As shown, a first limiting groove 170 is formed by axial depression at the orifice of the support hole position 140. The second thrust ring has a first boss 531 that cooperates with the first limiting groove 170. The first boss 531 is used for limiting the second thrust ring. Among them, the first boss 531 is located on the end face of the second thrust ring close to the support hole position 140. A second limiting groove 532 that cooperates with the end of the bearing ring 510 is formed by axial depression on the surface of the second thrust ring facing away from the first boss 531. A third limiting groove that cooperates with the end of the bearing ring 510 is formed by axial depression on the surface of the first thrust ring far from the abutting end 420. Thus, the position of the bearing ring 510 can be defined by the second limiting groove 532 and the third limiting groove. The impeller 200 is rotatably arranged on the bearing ring 510 through a pair of sliding bearings 520.

[0062] As Figure 11 shown, the diameters at both ends of the optical axis 430 are larger than the diameter of the middle region, so that there is a radial gap between the outer wall of the middle region of the optical axis 430 and the inner wall of the bearing ring 510, thereby forming a third channel 180 extending axially between the optical axis 430 and the bearing ring 510. Among them, the third channel 180 communicates with the liquid inlet end 120. Thus, the liquid can flow through the third channel 180 between the shaft core 400 and the bearing ring 510, further taking away the heat between the shaft core 400 and the bearing assembly 500.

[0063] A first channel 150 communicating the second liquid inlet 122 and the support hole position 140 is also provided in the pump head 100. The first channel 150 extends radially or in a direction with an acute angle to the radial direction. The first channel 150 can introduce the liquid in the second liquid inlet 122 into the support hole position 140. After the liquid passes through the support hole position 140, it then flows into the third channel 180.

[0064] As Figure 9 shown, an inlet 151 is formed on the hole wall of the support hole position 140 for the first channel 150. The inlet 151 is of a flared structure, so that the diameter of the inlet 151 is larger than the diameter of the first channel 150, thus facilitating the liquid to enter the third channel 180.

[0065] In order to enable the liquid to better enter the third channel 180, the inlet 151 is located at the aperture change region section of the optical axis 430, or on the side of the middle region with a thinner diameter of the optical axis 430 close to the support hole position 140. Thus, a buffer region can be formed at the inlet 151, which is beneficial to the liquid entering the third channel 180 from the first channel 150.

[0066] A pair of sliding bearings 520 have a preset gap in the axial direction. The preset gap enables a liquid storage space 190 to exist between the pair of sliding bearings 520. As Figure 10As shown, at least one communication hole 511 extending radially is provided on the circumferential wall of the bearing race 510 corresponding to the liquid storage space, and the communication hole 511 communicates the liquid storage space 190 with the third channel 180. Thus, the liquid can enter the bearing assembly 500, lubricating the bearing assembly 500 and taking away heat at the same time.

[0067] To prevent the liquid from leaking out through the gap between the isolation cover 300 and the pump head 100, a seal 340 is provided between the isolation cover 300 and the pump head 100. The pump head 100 is provided with a groove that cooperates with the seal 340, and the seal 340 is located in the groove. The seal connection between the isolation cover 300 and the pump head 100 is achieved through the seal 340.

[0068] As Figure 14 shown, the seal 340 includes an outer ring deformation ring 341, an inner ring deformation ring 342 provided inside the outer ring deformation ring 341, a first sealing ring 343 and a second sealing ring 344 provided between the outer ring deformation ring 341 and the inner ring deformation ring 342, and a biasing member 345 abutting between the first sealing ring 343 and the second sealing ring 344. Among them, the biasing member 345 is a compression spring, and the biasing member 345 is used to make the first sealing ring 343 and the second sealing ring 344 move away from each other, so that the first sealing ring 343 contacts the pump head 100 more tightly and the second sealing ring 344 contacts the convex ring portion 330 more tightly, thereby ensuring the sealing effect.

[0069] After the pump head 100 is connected to the bracket 720, the outer ring deformation ring 341 and the inner ring deformation ring 342 are subjected to an axial force, causing the outer ring deformation ring 341 and the inner ring deformation ring 342 to deform. Since the hardness of the groove wall is greater than that of the outer ring deformation ring 341, the inner ring deformation ring 342, the first sealing ring 343, and the second sealing ring 344, under the limiting action of the groove wall, the outer ring deformation ring 341 and the inner ring deformation ring 342 can only be pressed toward the first sealing ring 343 and the second sealing ring 344, thereby tightly holding the first sealing ring 343 and the second sealing ring 344 to ensure the sealing effect.

[0070] The above description is only the implementation mode of this application, and does not limit the patent scope of this application. Any equivalent structure or equivalent process transformation made by using the content of the specification and drawings of this application, or directly or indirectly applied to other related technical fields, shall be included in the patent protection scope of this application by the same token.

Claims

1. A magnetic pump, characterized in that: include: The pump head (100) is hollow inside and has one end open to form an open receiving chamber (110); the pump head (100) is also provided with a liquid inlet end (120) and a liquid outlet end (130) in communication with the receiving chamber (110); An isolation cover (300) is disposed on the opening to cover the opening; An axis core (400) is located in the receiving cavity (110), one end of the axis core (400) is in contact with the isolation cover (300), and the other end is fixed to the pump head (100); An impeller (200) is located in the receiving chamber (110) and is rotatably disposed on the shaft core (400); An internal magnetic component (600) is arranged on the impeller (200); An external magnetic assembly (700) connected to an output shaft of the motor (800) so as to be driven to rotate by the motor (800); The isolation cover (300) is located in the receiving cavity (110), the isolation cover (300) has a limiting portion (310) abutting against one end of the shaft core (400), and the pump head (100) is provided with a supporting hole (140) cooperating with the other end of the shaft core (400); The liquid inlet end (120) and the support hole (140) are provided on a wall surface of the pump head (100) perpendicular to the shaft core (400); the support hole (140) is in communication with the liquid inlet end (120); the shaft core (400) is provided with a core hole (410) penetrating the shaft core (400) in the axial direction; a guide channel (311) is formed in a depression on the limiting portion (310); the guide channel (311) is in communication with one end of the core hole (410) and the receiving cavity (110); The liquid inlet end (120) comprises a first liquid inlet (121) which is in communication with the support hole (140) and is coaxially distributed, and a plurality of second liquid inlets (122) which are in communication with the receiving cavity (110) and are distributed on the periphery of the first liquid inlet (121), wherein the plurality of second liquid inlets (122) are configured to transport liquid to the impeller (200); The pump head (100) is further provided with a second channel (160) communicating with the liquid outlet area of ​​the receiving chamber (110) and the second liquid inlet (122); the second channel (160) comprises an axial channel (162) and a radial channel (161) which are connected to each other; the axial channel (162) is connected to the liquid outlet area of ​​the receiving chamber (110); the radial channel (161) is connected to the second liquid inlet (122); wherein the radial channel (161) is provided with a first external connection port (163) on the outer surface of the pump head (100); and a first sealing plug is operably placed in the first external connection port (163).

2. The magnetic pump according to claim 1, characterized in that: The impeller (200) comprises an impeller body (210), and a mounting ring portion (220) fixedly arranged at the outer edge of the impeller body (210) and extending in the axial direction, wherein the impeller body (210) and the mounting ring portion (220) are surrounded to form an impeller cavity (230); The isolation cover (300) comprises a sleeve-shaped main body (320) and a convex ring (330) located at one end of the main body (320); the main body (320) is located in the impeller cavity (230), and the convex ring (330) abuts against the open portion; The inner magnetic component (600) is arranged on the mounting ring portion (220), and the outer magnetic component (700) is located inside the main body portion (320).

3. The magnetic pump according to claim 1, characterized in that: A first channel (150) is also provided in the pump head (100) and is connected to the second liquid inlet (122) and the support hole (140). The first channel (150) extends in a radial direction or in a direction that is acutely angled to the radial direction.

4. The magnetic pump according to claim 1, characterized in that: The impeller (200) is arranged on the shaft core (400) via a bearing assembly (500), the bearing assembly (500) comprising a pair of sliding bearings (520) inserted into a central hole (240) of the impeller (200), a bearing ring (510) inserted into the pair of sliding bearings (520) and sleeved on the shaft core (400), and a pair of thrust rings (530) sleeved on the shaft core (400) and abutting against two ends of the bearing ring (510); The shaft core (400) comprises an abutting end (420), an optical axis (430) fixedly mounted on the abutting end (420), and the bearing ring (510) and the pair of thrust rings (530) are respectively sleeved on the optical axis (430); The pair of thrust rings (530) comprises a first thrust ring located between the bearing ring (510) and the abutting end (420), and a second thrust ring located between the bearing ring (510) and the pump head (100); a first limiting groove (170) is formed at the opening of the support hole (140) along the axial direction, and the second thrust ring has a first boss (531) that cooperates with the first limiting groove (170); A second limiting groove (532) is formed on the surface of the second thrust ring away from the first boss (531) along the axial direction and cooperates with the end of the bearing ring (510); and a third limiting groove is formed on the surface of the first thrust ring away from the abutting end (420) along the axial direction and cooperates with the end of the bearing ring (510).

5. The magnetic pump according to claim 4, characterized in that: The diameters of both ends of the optical axis (430) are larger than the diameter of the middle region, so that a gap exists in the radial direction between the outer wall of the middle region of the optical axis (430) and the inner wall of the bearing ring (510), thereby forming a third channel (180) extending in the axial direction between the optical axis (430) and the bearing ring (510); Wherein, the third channel (180) is in communication with the liquid inlet end (120).

6. The magnetic pump according to claim 5, characterized in that: The pair of sliding bearings (520) have a preset gap in the axial direction, and the preset gap allows a liquid storage space (190) to exist between the pair of sliding bearings (520). The bearing ring (510) is provided with a connecting hole (511) extending in the radial direction on a circumferential wall surface corresponding to the liquid storage space, and the connecting hole (511) connects the liquid storage space (190) with the third channel (180).

7. The magnetic pump according to claim 1, characterized in that: A sealing member (340) is provided between the isolation cover (300) and the pump head (100), and a groove cooperating with the sealing member (340) is provided on the pump head (100); The sealing member (340) includes an outer ring deformable ring (341), an inner ring deformable ring (342) arranged on the inner side of the outer ring deformable ring (341), a first sealing ring (343) and a second sealing ring (344) arranged between the outer ring deformable ring (341) and the inner ring deformable ring (342), and a biasing member (345) abutting between the first sealing ring (343) and the second sealing ring (344), wherein the biasing member (345) is configured to make the first sealing ring (343) and the second sealing ring (344) move away from each other.

8. The magnetic pump according to claim 1, characterized in that: The pump head (100) is connected to the housing of the motor (800) via a bracket (720), and the isolation cover (300) is sandwiched between the pump head (100) and the bracket (720); The external magnetic component (700) is arranged on the connecting piece (710), and the bracket (720) and the isolation cover (300) are surrounded to form a space for accommodating the connecting piece (710).

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