Magnetic drive pump

Abstract

The invention discloses a magnetic drive pump which comprises a pump head which is hollow, one end of the pump head is open to form a containing cavity, and the pump head is further provided with a liquid inlet end and a liquid outlet end which are communicated with the containing cavity; the isolation hood covers the opening so as to seal the opening; the shaft core is located in the containing cavity, one end of the shaft core abuts against the isolation cover, and the other end of the shaft core is fixedly arranged on the pump head; the impeller is located in the containing cavity and rotationally arranged on the shaft core; the inner magnetic assembly is arranged on the impeller; the outer magnetic assembly is connected with an output shaft of the motor so as to be driven by the motor to rotate; wherein the isolation hood is located in the containing cavity, the isolation hood is provided with a limiting part abutting against one end of the shaft core, and the pump head is provided with a supporting hole position matched with the other end of the shaft core; the wall face, perpendicular to the shaft core, of the pump head is provided with a liquid inlet end and a supporting hole site, the supporting hole site is communicated with the liquid inlet end, the shaft core is provided with a core hole penetrating through the shaft core in the axial direction, the limiting part is sunken to form a flow guide channel, and the flow guide channel is communicated with one end of the core hole and the containing cavity.

Description

Technical Field

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

[0002] A magnetic pump is a type of pump that uses the principle of permanent magnetic transmission technology to achieve contactless 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. It is widely used in various industries. In the prior art, both ends of the shaft core inside the magnetic pump are provided with support structures for support, which makes the axial span of the magnetic pump larger, resulting in a large space occupied by the magnetic pump 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 object of the present invention is to provide a magnetic pump with a compact structure.

[0004] The objective of the present invention is achieved through the following technical solutions: A magnetic pump comprises: a pump head, which is hollow inside and opened at one end to form a receiving chamber with an open opening, and the pump head is also provided with a liquid inlet end and a liquid outlet end connected to the receiving chamber; an isolation cover, which is covered at the open opening to close the open opening; an axis core, which is located in the receiving chamber, one end of the axis core is in contact with the isolation cover, and the other end is fixed to the pump head; an impeller, which is located in the receiving chamber and is rotatably arranged on the axis core; an internal magnetic component, which is arranged on the impeller; and an external magnetic component, which is connected to the output shaft of the motor. so as to be driven to rotate by the motor; wherein, the isolation cover is located in the receiving chamber, the isolation cover has a limiting portion abutting against one end of the shaft core, and the pump head is provided with a supporting hole matched with the other end of the shaft core; the liquid inlet end and the supporting hole are provided on the wall surface of the pump head perpendicular to the shaft core, the supporting hole is connected with the liquid inlet end, the shaft core is provided with a core hole passing through it along the axial direction, and a guide channel is formed in a depression on the limiting portion, and the guide channel connects one end of the core hole with the receiving chamber.

[0005] Preferably, the impeller comprises an impeller body, a mounting ring portion fixedly arranged at the outer edge of the impeller body and extending in the axial direction, and the impeller body and the mounting ring portion are surrounded to form an impeller cavity; The isolation cover comprises a sleeve-shaped main body and a convex ring located at one end of the main body, the main body is located in the impeller cavity, and the convex ring abuts against the open portion; The inner magnetic component is arranged on the mounting ring portion, and the outer magnetic component is located in the main body portion.

[0006] Preferably, the liquid inlet end includes a first liquid inlet connected to the supporting hole and coaxially distributed, and a plurality of second liquid inlets connected to the receiving cavity and distributed on the periphery of the first liquid inlet, wherein the plurality of second liquid inlets are configured to transport liquid to the impeller.

[0007] Preferably, a second channel connecting the liquid outlet area of ​​the accommodating cavity and the second liquid inlet is further provided in the pump head, and the second channel includes an axial channel and a radial channel that are connected to each other, the axial channel is connected to the liquid outlet area of ​​the accommodating cavity, and the radial channel is connected to the second liquid inlet, wherein the radial channel forms a first external port on the outer surface of the pump head, and a first sealing plug is operably placed in the first external port.

[0008] Preferably, a first channel connecting the second liquid inlet and the supporting hole is further provided in the pump head, and the first channel extends in a radial direction or in a direction having an acute angle with the radial direction.

[0009] Preferably, the impeller is arranged on the shaft core through a bearing assembly, and the bearing assembly includes a pair of sliding bearings inserted into the central hole of the impeller, a bearing ring 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 two ends of the bearing ring; Wherein, the shaft core comprises an abutting end and an optical shaft fixed on the abutting end, and the bearing ring and the pair of thrust rings are respectively sleeved on the optical shaft; The pair of thrust rings comprises a first thrust ring located between the bearing ring and the abutting end, and a second thrust ring located between the bearing ring and the pump head, a first limiting groove is formed at the orifice of the support hole along the axial direction, and the second thrust ring has a first boss matched with the first limiting groove; The surface of the second thrust ring facing away from the first boss is axially recessed to form a second limiting groove that cooperates with the end of the bearing ring; the surface of the first thrust ring away from the abutting end is axially recessed to form a third limiting groove that cooperates with the end of the bearing ring.

[0010] Preferably, the diameters of the two ends of the optical axis are larger than the diameter of the middle region, so that there is a gap in the radial direction between the outer wall of the middle region of the optical axis and the inner wall of the bearing ring, thereby forming a third channel extending in the axial direction between the optical axis and the bearing ring; Wherein, the third channel is communicated with the liquid inlet end.

[0011] Preferably, there is a preset gap between the pair of sliding bearings in the axial direction, and the preset gap allows a liquid storage space to exist between the pair of sliding bearings. A connecting hole extending radially is provided on the circumferential wall surface of the bearing ring corresponding to the liquid storage space, and the connecting hole connects the liquid storage space with the third channel.

[0012] Preferably, a sealing member is provided between the isolation cover and the pump head, and the pump head is provided with a groove cooperating with the sealing member; The sealing member includes an outer ring deformable ring, an inner ring deformable ring arranged on the inner side of the outer ring deformable ring, a first sealing ring and a second sealing ring arranged between the outer ring deformable ring and the inner ring deformable ring, and a biasing member abutting between the first sealing ring and the second sealing ring, wherein the biasing member is configured to make the first sealing ring and the second sealing ring move away from each other.

[0013] Preferably, the pump head is connected to the housing of the motor through a bracket, and the isolation cover is sandwiched between the pump head and the bracket; Wherein, the external magnetic component is arranged on the connecting piece, and the bracket and the isolation cover are surrounded to form a space for accommodating the connecting piece.

[0014] Compared with the prior art, the present invention has the following beneficial effects: In the present invention, the rear end support of the shaft core can be achieved through the isolation cover, so that the rear end of the shaft core does not need to be provided with a rear end support structure, which simplifies the internal structure of the magnetic pump and improves the stress condition of the shaft core; The limiting portion is recessed to form a flow guide channel, which connects the rear end of the core hole with the receiving cavity. Thus, the liquid can enter the core hole through the liquid inlet end, and then enter the receiving cavity through the flow guide 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

[0015] Figure 1 A schematic diagram of the three-dimensional structure of the magnetic pump provided by the present invention; Figure 2 A schematic cross-sectional structure diagram of the magnetic pump provided by the present invention; Figure 3 A schematic diagram of the exploded structure of the magnetic pump provided by the present invention; Figure 4 It is a schematic diagram of the three-dimensional structure of the pump head; Figure 5 It is a schematic diagram of the three-dimensional structure of the impeller at the first viewing angle; Figure 6 is a schematic diagram of the three-dimensional structure of the impeller at a second viewing angle; Figure 7Schematic diagram of the three-dimensional structure of the isolation cover; Figure 8 It is a schematic diagram of the cross-sectional structure of the isolation cover; Fig. 9 is a schematic diagram of the cross-sectional structure of a bearing assembly; Fig.10 is a schematic diagram of the three-dimensional structure of the bearing ring; Fig.11 Schematic diagram of the three-dimensional structure of the shaft core; Fig.12 A schematic diagram of the three-dimensional structure of the thrust ring in the first perspective; Fig.13 A schematic diagram of the three-dimensional structure of the thrust ring at a second viewing angle; Fig.14 A schematic diagram of the cross-sectional structure of the seal. DETAILED DESCRIPTION

[0016] In order to make the above-mentioned purposes, features and advantages of the present application more obvious and easy to understand, the specific implementation methods of the present application are described in detail below in conjunction with the accompanying drawings. It is to be understood that the specific embodiments described herein are only used to explain the present application, rather than to limit the present application. It should also be noted that, for ease of description, only some structures related to the present application are shown in the accompanying drawings, rather than all structures. Based on the embodiments in the present application, all other embodiments obtained by ordinary technicians in this field without making creative work are within the scope of protection of this application.

[0017] The terms "including" and "having" and any variations thereof in this application are intended to cover non-exclusive inclusions. For example, a process, method, system, product or device comprising a series of steps or units is not limited to the listed steps or units, but may optionally include steps or units not listed, or may optionally include other steps or units inherent to these processes, methods, products or devices.

[0018] Reference to "embodiments" herein means that a particular feature, structure, or characteristic described in conjunction with the embodiments may be included in at least one embodiment of the present application. The appearance of the phrase in various locations in the specification does not necessarily refer to the same embodiment, nor is it an independent or alternative embodiment that is mutually exclusive with other embodiments. It is explicitly and implicitly understood by those skilled in the art that the embodiments described herein may be combined with other embodiments.

[0019] like Figures 1 to 3As 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, wherein the bracket 720 connects the housing of the motor 800 and the pump head 100, and the isolation cover 300 is clamped between the pump head 100 and the bracket 720. Therefore, there is no need to connect the isolation cover 300 and the pump head 100, and 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.

[0020] like Figure 4 As shown, the pump head 100 is hollow inside and opened at one end to form an open receiving chamber 110. The isolation cover 300 is located in the receiving chamber 110 and is covered at the open opening to close the open opening. The isolation cover 300 is located in the pump head 100, which can effectively reduce the span of the magnetic pump in the axial direction, which is very beneficial to reducing the size in the axial direction.

[0021] The receiving chamber 110 is provided with a shaft core 400 and an impeller 200, and the impeller 200 is rotatably arranged on the shaft 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 which are connected to the receiving chamber 110. When the impeller 200 rotates, the liquid is sucked into the receiving chamber 110 through the liquid inlet end 120, and finally pumped out through the liquid outlet end 130. It is worth noting that the axial direction and radial direction in this embodiment refer to the axial direction of the shaft core 400.

[0022] like Figure 5 and Figure 6 As shown, the impeller 200 includes an impeller body 210, a mounting ring portion 220 fixed at the outer edge of the impeller body 210 and extending axially, the impeller body 210 and the mounting ring portion 220 surround an impeller cavity 230, and the internal magnetic component 600 is disposed on the inner side wall of the mounting ring portion 220 and is located in the impeller cavity 230.

[0023] like Figure 7 and Figure 8 As shown, the isolation cover 300 includes a sleeve-shaped main body portion 320 located in the impeller chamber 230, and a convex ring portion 330 located at the rear end of the main body portion 320, wherein the convex ring portion 330 is a flange structure formed at the rear end of the main body portion 320, and the convex ring portion 330 abuts against the open portion to have the function of installation limiting.

[0024] like Figure 2 As shown, the outer magnetic assembly 700 and the inner magnetic assembly 600 are respectively located on the inner and outer sides of the main body 320 of the isolation cover 300 , wherein the outer magnetic assembly 700 is located inside the main body 320 , and the inner magnetic assembly 600 is located outside the main body 320 .

[0025] The external magnetic assembly 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, the output shaft 810 is connected to a connector 710, the external magnetic assembly 700 is disposed on the connector 710, and the connector 710 is located inside the bracket 720.

[0026] In order to better cooperate with the outer magnetic assembly 700 and the inner magnetic assembly 600, the connector 710 partially extends into the main body 320, that is, the connector 710 is located in the space surrounded by the bracket 720 and the isolation cover 300. The outer magnetic assembly 700 is arranged on the outer side wall of the area section where the connector 710 is located in the main body 320, so that the outer magnetic assembly 700 and the inner magnetic assembly 600 are flushly distributed in the axial direction, thereby not only facilitating the magnetic force between the outer magnetic assembly 700 and the inner magnetic assembly 600, but also reducing the axial size of the magnetic pump.

[0027] Regarding the installation limit of the shaft core 400, one end of the shaft core 400 is in contact with the isolation cover 300, and the other end is fixed on the pump head 100. In order to facilitate the description of the positional relationship between the various components, the pump head 100 and the motor 800 are used 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. In other words, the front end of the shaft core 400 is fixed on the pump head 100, and the rear end is in contact with the isolation cover 300.

[0028] Specifically, a support hole 140 matching the front end of the shaft core 400 is provided on the inner wall surface of the pump head 100, and the front end of the shaft core 400 is inserted into the support hole 140. The isolation cover 300 has a limit portion 310 abutting against the rear end of the shaft core 400. The shape of the limit portion 310 is not limited, and can be a structure protruding relative to the wall surface of the isolation cover 300, or a structure recessed relative to the wall surface of the isolation cover 300, as long as it can abut against the rear end of the shaft core 400.

[0029] In the prior art, the rear end of the shaft core 400 is usually provided with a rear end support structure, and the installation limit of the shaft core 400 is achieved through the support of the front and rear ends. In this solution, the isolation cover 300 is fully utilized, and the rear end support of the shaft core 400 is achieved through the isolation cover 300. Therefore, there is no need to set up a rear end support structure, which simplifies the internal structure of the magnetic pump, improves the stress condition of the shaft core 400, and avoids the cantilever structure.

[0030] Furthermore, if Figure 2 , Figure 4 and Figure 8As shown, the support hole 140 is located on the inner 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 140 is connected to the liquid inlet end 120, and the shaft core 400 is provided with a core hole 410 that runs through it in the axial direction. Considering that the limiting portion 310 is connected to the rear end of the shaft core 400, in order to allow the liquid to flow smoothly, a guide channel 311 is formed in a depression on the limiting portion 310, and the guide channel 311 connects the rear end of the core hole 410 with the receiving chamber 110. As a result, the liquid can enter the core hole 410 through the liquid inlet end 120, and then enter the receiving chamber 110 through the guide 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.

[0031] The liquid inlet end 120 includes a first liquid inlet 121 that is connected to the support hole 140 and coaxially distributed, and a plurality of second liquid inlets 122 that are connected to the receiving cavity 110 and distributed on the periphery of the first liquid inlet 121, wherein the plurality of second liquid inlets 122 are used to deliver liquid to the impeller 200. The above-mentioned arrangement of the liquid inlet end 120 can realize liquid diversion to meet the liquid inlet requirements of the impeller 200 and the core hole 410.

[0032] In order to make the liquid in the magnetic pump circulate better, a second channel 160 connecting the liquid outlet area of ​​the accommodating chamber 110 and the second liquid inlet 122 is also provided in the pump head 100, wherein the liquid outlet area of ​​the accommodating chamber 110 is the area of ​​the accommodating chamber 110 close to the liquid outlet end 130. Since the pressure at the liquid outlet end 130 is relatively high, the liquid in the liquid outlet area can quickly enter the second liquid inlet 122 through the second channel 160.

[0033] The second channel 160 includes an axial channel 162 and a radial channel 161 which are connected to each other, wherein the axial channel 162 is connected to the liquid outlet area of ​​the receiving chamber 110, and the radial channel 161 is connected to the second liquid inlet 122. The axial channel 162 is generally extended in the axial direction, or has an acute angle with the axial direction; similarly, the radial channel 161 is generally extended in the radial direction, or has an acute angle with the radial direction. It should be noted that in this specification, "generally" can be understood as close to, approximately, or within a predetermined range from the target value.

[0034] In one embodiment, if Figure 2As shown, the radial channel 161 is formed with a first external port 163 on the outer surface of the pump head 100, and a first sealing plug (not shown) is operably placed in the first external port 163. When the first sealing plug is removed, other external liquid can enter the receiving chamber 110 through the second liquid inlet 122. A second external port 164 is also provided at the bottom of the pump head 100, and the central axis of the second external port 164 is parallel to the central axis of the first liquid inlet 121. A second sealing plug (not shown) is operably placed in the second external port 164. When the magnetic pump is not in use, the second sealing plug is removed, and the liquid in the receiving chamber 110 can be discharged to the external environment through the second external port 164 to avoid liquid retention in the receiving chamber 110.

[0035] Regarding the bearing assembly 500, as Fig. 9 As shown, the bearing assembly 500 includes a pair of sliding bearings 520 inserted in the center hole 240 of the impeller 200, a bearing ring 510 inserted in 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 ring 510.

[0036] like Fig.11 As shown, the shaft core 400 includes an abutting end 420, an optical axis 430 fixed on the abutting end 420, and a bearing ring 510 and a pair of thrust rings 530 are respectively sleeved on the optical axis 430. The pair of thrust rings 530 includes 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.

[0037] like Figure 2 , Figure 4 , Fig.12 , Fig.13 As shown, the opening of the support hole 140 is axially recessed to form a first limiting groove 170, and the second thrust ring has a first boss 531 that matches the first limiting groove 170. The first boss 531 is used for limiting the second thrust ring, wherein the first boss 531 is located on the end face of the second thrust ring close to the support hole 140. The second thrust ring is axially recessed on the surface away from the first boss 531 to form a second limiting groove 532 that matches the end of the bearing ring 510. The first thrust ring is axially recessed on the surface away from the abutment end 420 to form a third limiting groove that matches the end of the bearing ring 510. Therefore, the position of the bearing ring 510 can be limited 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.

[0038] like Fig.11As shown, the diameters of the two ends of the optical axis 430 are larger than the diameter of the middle area, so that there is a gap in the radial direction between the outer wall of the middle area 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 connected to the liquid inlet end 120. Thus, the liquid can flow between the shaft core 400 and the bearing ring 510 through the third channel 180, and further take away the heat between the shaft core 400 and the bearing assembly 500.

[0039] The pump head 100 is further provided with a first channel 150 connecting the second liquid inlet 122 and the support hole 140. The first channel 150 extends in a radial direction or in a direction having an acute angle with the radial direction. The first channel 150 can introduce the liquid in the second liquid inlet 122 into the support hole 140. After the liquid passes through the support hole 140, it flows into the third channel 180.

[0040] like Fig. 9 As shown, the first channel 150 is formed with an inlet 151 on the hole wall of the support hole 140 , and the inlet 151 is a flared structure so that the diameter of the inlet 151 is larger than the diameter of the first channel 150 , thereby facilitating the liquid to enter the third channel 180 .

[0041] In order to allow the liquid to enter the third channel 180 better, the inlet 151 is located at the aperture change area of ​​the optical axis 430, or at the middle area of ​​the optical axis 430 with a thinner diameter close to the support hole 140. Thus, a buffer area can be formed at the inlet 151, which is conducive to the liquid entering the third channel 180 from the first channel 150.

[0042] There is a preset gap between the pair of sliding bearings 520 in the axial direction, and the preset gap allows a liquid storage space 190 to exist between the pair of sliding bearings 520. Fig.10 As shown, at least one connecting hole 511 extending radially is provided on the circumferential wall surface of the bearing ring 510 corresponding to the liquid storage space, and the connecting hole 511 connects the liquid storage space 190 and the third channel 180. Thus, liquid can enter the bearing assembly 500, lubricate the bearing assembly 500 and take away heat.

[0043] In order to prevent liquid from leaking out from 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, and a groove matching the seal 340 is provided on the pump head 100, and the seal 340 is located in the groove. The seal 340 realizes a sealed connection between the isolation cover 300 and the pump head 100.

[0044] like Fig.14As shown, the sealing member 340 includes an outer ring deformable ring 341, an inner ring deformable ring 342 disposed inside the outer ring deformable ring 341, a first sealing ring 343 and a second sealing ring 344 disposed 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. 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 is in closer contact with the pump head 100, and the second sealing ring 344 is in closer contact with the convex ring portion 330, thereby ensuring a sealing effect.

[0045] When the pump head 100 is connected to the bracket 720, the outer ring deforming ring 341 and the inner ring deforming ring 342 are subjected to axial force, causing the outer ring deforming ring 341 and the inner ring deforming ring 342 to deform. Since the hardness of the groove wall is greater than the hardness of the outer ring deforming ring 341, the inner ring deforming ring 342, the first sealing ring 343, and the second sealing ring 344, under the limiting effect of the groove wall, the outer ring deforming ring 341 and the inner ring deforming ring 342 can only be squeezed toward the first sealing ring 343 and the second sealing ring 344, thereby holding the first sealing ring 343 and the second sealing ring 344 to ensure the sealing effect.

[0046] The above description is only an implementation method of the present application, and does not limit the patent scope of the present application. Any equivalent structure or equivalent process transformation made using the contents of the description and drawings of this application, or directly or indirectly used in other related technical fields, are also included in the patent protection scope of the present application.

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) along 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).

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: 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).

4. The magnetic pump according to claim 3, characterized in that: 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).

5. The magnetic pump according to claim 3, 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.

6. 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).

7. The magnetic pump according to claim 6, 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).

8. The magnetic pump according to claim 7, 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).

9. 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.

10. 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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