WO2025214517A1 - Quick-replacement structure for pump head, and magnetically levitated pump - Google Patents

Abstract

A quick-replacement structure (1) for a pump head, wherein the quick-replacement structure comprises a flange (10) and a limiting unit; the pump head (61) comprises a housing (610); the limiting unit comprises a plurality of limiting blocks (21) and a plurality of snap-fit fasteners (22); the plurality of limiting blocks (21) are arranged on an upper end face of the flange (10) at intervals in a circumferential direction; the plurality of limiting blocks (21) and the flange (10) form an accommodating space for the housing; the plurality of snap-fit fasteners (22) are arranged on the outer circumference of the housing (610) at intervals; a first limiting portion (210) for axially limiting a snap-fit fastener (22) and a second limiting portion (211) for limiting the screwing-in direction of the pump head are provided on the side of each of the limiting blocks close to the pump head (61); and at least one limiting block (21) is internally provided with a locking unit (30), and the locking unit (30) can rotate relative to the limiting block (21) and limit the screwing-out direction of the pump head (61). In the quick-replacement structure, quick assembly of the pump head can be achieved, and the flange need not be disassembled.

Description

Quick-change structure and magnetic levitation pump for pump head

CROSS-REFERENCE TO RELATED APPLICATIONS

This disclosure claims priority to Chinese patent application number 202410425274.9, filed with the Patent Office of China on April 10, 2024, entitled “Quick-change structure for pump head and magnetic levitation pump,” the entire contents of which are incorporated herein by reference.

Technical Field

The present application relates to the field of magnetic levitation technology, and specifically to a quick-change structure for a pump head and a magnetic levitation pump.

Background Art

A magnetic levitation motor is a magnetic levitation rotary drive that uses magnetic field force to suspend the rotor so that there is no mechanical contact between the rotor and the stator. The magnetic levitation motor can be a magnetic bearing motor, a bearingless motor or a bearingless thin-film motor.

A magnetic bearing motor, also known as a magnetic bearing, is a motor that combines a rotary drive motor with an axial magnetic bearing or/and a radial magnetic bearing or/and an axial-diameter hybrid magnetic bearing, rather than integrating them together.

A bearingless motor integrates motor rotation and suspension functions. A bearingless motor uses an additional winding on top of the winding that generates the rotating drive magnetic field to generate an excitation magnetic field. The interaction between the two magnetic fields disrupts the balanced distribution of the original drive magnetic field, generating a radial force on the rotor. The rotor is suspended by controlling the radial force in the motor. Compared to magnetic bearing motors, the magnetic suspension winding of a bearingless motor is wound around the stator and does not occupy additional radial space, thus overcoming the disadvantages of the large size and high cost of magnetic bearings to a certain extent. In order to achieve suspension of the motor rotor in five degrees of freedom, early bearingless motors generally required two bearingless motors and an axial magnetic bearing.

The bearingless thin-film motor is a special bearingless motor that inherits the advantages of bearingless motors. The axial length to diameter ratio of the rotor is very small and it is thin-film, eliminating the need for axial magnetic bearings. The bearingless technology is used to achieve rotor rotation and active radial suspension. The magnetic circuit formed by the mechanical structure is used to achieve passive suspension of the other three degrees of freedom in addition to the radial and rotor rotational degrees of freedom. It has the characteristics of high cleanliness, no precipitation, no particles, no dynamic seals, and superior performance. It has good application prospects in ultra-pure drive fields such as biochemistry, medical care, and semiconductor manufacturing.

Unless otherwise specified, the term magnetic levitation motor refers to a magnetic levitation rotary drive that uses magnetic field force to suspend the rotor so that there is no mechanical contact between the rotor and stator.

Magnetic levitation motors can be equipped with components of different functions to create magnetic levitation devices tailored to different application requirements, adapting to different application scenarios. Magnetic levitation devices can be configured as magnetic levitation pumps, magnetic levitation agitators, and the like. In the application of a magnetic levitation pump, the magnetic levitation pump includes a magnetic levitation motor and a pump head. The pump head includes a pump housing and an impeller disposed within the pump housing. The magnetic levitation rotor is both the rotor of the magnetic levitation motor and part of the pump's impeller. It can be, for example, a permanent magnet rotor, a short-circuit cage rotor, or a reluctance rotor. The magnetic levitation stator is both a rotationally driven stator and a magnetically levitated stator. The magnetic levitation stator is configured to drive the rotor impeller to rotate and levitate.

Currently, in the overall structure of a magnetic levitation pump, the magnetic levitation motor is directly fixedly connected to the pump head, which is placed at the upper end of the magnetic levitation motor. After adjusting the relative positions of the two, multiple screws are sequentially inserted into the pump head and the magnetic levitation motor, and each screw is tightened to achieve a secure connection between the two. If the pump head of a magnetic levitation pump is damaged after long-term use or needs to be replaced according to actual needs, all the screws connecting the magnetic levitation motor and the pump head need to be removed, the pump head removed and a new pump head installed, and then the multiple screws are tightened one by one. Therefore, the assembly and disassembly process of replacing the pump head is cumbersome and inefficient, and the operator needs to use both hands to install and replace the pump head, which requires a lot of time and labor costs. In addition, in actual use, due to different usage sites and specific needs, the magnetic levitation pump has the problem of needing to adjust the direction of the pump head outlet, that is, the installation direction of the pump head relative to the magnetic levitation motor. In this case, it is necessary to remove all the screws, rotate the relative position of the pump head with respect to the magnetic levitation motor to adjust the direction of the pump head outlet, and then lock the pump head after adjustment. The operation process is cumbersome and the purpose of quickly changing the assembly direction of the pump head cannot be achieved.

Application Contents

In order to overcome the defects in the prior art, the embodiments of the present application provide a quick-change structure for a pump head and a magnetic levitation pump, which are used to solve at least one of the above problems.

The embodiments of the present application disclose a quick-change structure and a magnetic levitation pump for a pump head, wherein the quick-change structure fixes the relative position of the pump head and the quick-change structure through the accommodating space formed by the flange and the limit block, and realizes the axial limitation of the buckle and the limitation of the pump head in and out directions respectively through the first limit part, the second limit part and the locking unit, thereby achieving the purpose of quickly assembling and positioning the pump head, and there is no need to remove the flange. By moving the locking unit in the direction away from the pump head to release the limitation of the locking unit on the pump head in the outward rotation direction, the pump head can be taken out, and the installation position of the pump head can be quickly adjusted or the pump head can be replaced. In addition, the replacement process meets the design requirements of one-handed installation and two-handed disassembly, is easy to operate, and has high assembly and disassembly efficiency, which greatly saves assembly time and labor costs and facilitates later maintenance.

Among them, the quick-change structure for the pump head described in the embodiment of the present application, the pump head includes a shell, the quick-change structure includes a flange and a limit unit, the limit unit includes a plurality of limit blocks and a plurality of clips, the plurality of limit blocks are arranged at intervals along the circumferential direction on the upper end surface of the flange, the plurality of limit blocks and the flange constitute the accommodating space of the shell, the plurality of clips are arranged at intervals on the outer circumference of the shell, the side of the limit block adjacent to the pump head is provided with a first limit portion for axially limiting the clip and a second limit portion for limiting the screw-in direction of the pump head, at least one of the limit blocks is provided with a locking unit, and the locking unit can rotate relative to the limit block and limit the screw-out direction of the pump head.

Optionally, the first limiting portion extends from one end of the limiting block along the screwing direction of the pump head, and when the buckle rotates into the limiting block, the first limiting portion is tightly fitted with the top of the buckle.

Optionally, a groove is provided at the bottom of one side of the limit block adjacent to the pump head, the groove cooperates with the buckle, the groove has a top wall surface and a stop surface, the first limit portion is configured as the top wall surface of the groove, and the second limit portion is configured as the stop surface of the groove.

Optionally, the groove also includes an entry surface, and the entry surface and the stop surface are arranged in sequence along the screw-in direction of the pump head, and the entry surface and the stop surface form a certain angle α, wherein 90°≤α＜180°, the entry surface is configured as an arc surface, and the stop surface is configured as an inclined surface. The entry surface approximately forms a circle and is configured as a concentric circle with the shell, and the stop surface can abut against the inclined surface of the buckle.

Optionally, at least one of the limit blocks is provided with a receiving cavity, a mounting hole is provided at the bottom of the receiving cavity, a rotating connection piece is provided in the mounting hole, and the locking unit is arranged in the receiving cavity and is rotatably connected to the limit block through the rotating connection piece.

Optionally, the locking unit includes a hook and a torsion spring, the hook includes a hook body, a handle and a hook portion, the handle and the hook portion are respectively arranged at both ends of the hook body, the rotating connecting member is configured as a pin shaft, the hook body and the torsion spring are sleeved on the pin shaft, and the hook body and the limit block are rotatably connected through the pin shaft.

Optionally, a limiting groove is provided on the hook body, the torsion spring is arranged on a side of the hook body adjacent to the limiting groove, the first end of the torsion spring is arranged in the limiting groove, and the second end of the torsion spring abuts against the side wall of the accommodating cavity.

Optionally, the torsion spring is disposed between the bottom wall of the accommodating cavity and the hook body, and the pin connects the mounting hole, the torsion spring and the hook body in sequence from the bottom of the accommodating cavity; or,

The torsion spring is arranged between the top wall of the accommodating cavity and the hook body, and the pin is sequentially connected to the mounting hole, the hook body and the torsion spring from the bottom of the accommodating cavity.

Optionally, the handle extends from an end of the hook body away from the hook portion and back toward the hook portion, and the handle has a pressure portion extending in a circumferential direction; or, the handle has a pressure portion extending in an axial direction.

Optionally, an outer edge surface of the pressure-applying portion is provided with an anti-slip portion, and the anti-slip portion is configured as an anti-slip groove or an anti-slip protrusion.

Optionally, when the pump head rotates along the screw-in direction until the buckle abuts against the hook, the pump head continues to rotate, and the buckle pushes the hook to drive the torsion spring to rotate back toward the pump head. When the buckle passes over the hook, the torsion spring rebounds and drives the hook to rotate toward the pump head.

Optionally, one end of the limiting block and the top of the side thereof adjacent to the pump head form a blocking portion, and the blocking portion can abut against the hook portion to limit the rotation stroke of the hook toward the pump head.

Optionally, the buckle has a top surface, a first outer edge surface and a second outer edge surface that cooperate with the groove. Along the screwing direction of the pump head, the top surface is configured as a plane and a downward-inclined inclined surface in sequence. The first outer edge surface and the second outer edge surface are arranged in sequence along the screwing direction of the pump head. The first outer edge surface is configured as an arc-shaped surface that cooperates with the entry surface, and the second outer edge surface is configured as an inclined surface that tilts downward toward the screwing direction of the pump head to cooperate with the stop surface.

Optionally, a rotor cavity and an impeller cavity are formed in the shell, the rotor cavity is arranged on one side of the impeller cavity, a liquid outlet connected to the interior of the impeller cavity is formed on the shell, the opening between two adjacent limit blocks is configured as a placement port for the liquid outlet, the clip is arranged on the outer circumference of the impeller cavity and the bottom of the clip and the bottom of the impeller cavity are located on the same plane.

Optionally, the liquid outlet and one of the clips are arranged in the placement port, the circumferential distance between a side of the clip facing away from the liquid outlet and a side of the liquid outlet facing away from the clip is less than or equal to the circumferential distance of the placement port, and the circumferential distance between a side of the clip facing away from the liquid outlet and a side of the liquid outlet facing the clip is greater than or equal to the circumferential distance of the groove.

Optionally, at least one rubber stopper is further included. A blind hole is provided on one side of the limit block adjacent to the pump head. The rubber stopper is correspondingly arranged in the blind hole and protrudes in the radial direction to abut against the buckle.

Optionally, there are four limit blocks, one locking unit, and four buckles.

An embodiment of the present application also discloses a magnetic levitation pump, including a magnetic levitation motor and a pump head, the magnetic levitation motor including a stator, the pump head including a housing and a rotor impeller arranged in the housing, a rotor cavity and an impeller cavity being formed in the housing, and also including a quick-change structure for the pump head, the pump head being fixed to the magnetic levitation motor through the quick-change structure, and the stator being configured to generate a magnetic field to drive the rotor impeller to rotate and levitate.

Optionally, a plurality of bolt holes are provided on the flange at intervals along the circumferential direction, each of the bolt holes is correspondingly arranged at the outer edge of each of the limit blocks, and the flange is fixed to the magnetic levitation motor by passing bolts through the bolt holes.

Optionally, a cavity is provided inside the magnetic levitation motor, and the cavity is configured to accommodate the rotor cavity. When the rotor cavity is placed in the cavity, the outer wall of the rotor cavity abuts against the inner wall of the cavity to limit the pump head in the radial direction.

The beneficial effects of the embodiments of the present application are as follows:

The quick-change structure fixes the relative position of the pump head and the quick-change structure through the accommodating space formed by the flange and the limit block, and realizes the axial limitation of the buckle and the limitation of the pump head's rotation in and out direction through the first limit part, the second limit part and the locking unit, respectively, to achieve the purpose of quickly assembling and positioning the pump head, and there is no need to remove the flange. The pump head installation position can be quickly adjusted and the pump head can be replaced by turning the locking unit. The replacement process meets the design requirements of one-handed installation and two-handed disassembly, is easy to operate, and has high assembly and disassembly efficiency, which greatly saves assembly time and labor costs and facilitates later maintenance.

In order to make the above and other purposes, features and advantages of the present application more obvious and easy to understand, preferred embodiments are given below and described in detail with reference to the accompanying drawings.

BRIEF DESCRIPTION OF THE DRAWINGS

In order to more clearly illustrate the embodiments of the present application or the technical solutions in the prior art, the following briefly introduces the drawings required for use in the embodiments or the description of the prior art. Obviously, the drawings described below are only some embodiments of the present application. For ordinary technicians in this field, other drawings can be obtained based on these drawings without any creative work.

FIG1 is a schematic structural diagram of a quick-change structure for a pump head in an embodiment of the present application;

FIG2 is an enlarged view of the limit block at position A in FIG1 ;

FIG3 is a schematic structural diagram of the housing of the pump head in an embodiment of the present application;

FIG4 is an enlarged view of the buckle at position D in FIG3 ;

FIG5 is a schematic structural diagram of a quick-change structure for a pump head in an embodiment of the present application;

FIG6 is an enlarged view of a limit block provided with a locking unit at position B in FIG5 ;

FIG7 is a schematic structural diagram of a locking unit in an embodiment of the present application;

FIG8 is a schematic structural diagram of a locking unit in an embodiment of the present application;

FIG9 is a schematic structural diagram of a quick-change structure for a pump head in an embodiment of the present application;

FIG10 is a schematic structural diagram of a quick-change structure for a pump head in an embodiment of the present application;

FIG11 is a schematic structural diagram of a quick-change structure for a pump head in an embodiment of the present application;

FIG12 is a schematic structural diagram of a quick-change structure for a pump head in an embodiment of the present application;

FIG13 is a schematic structural diagram of a quick-change structure for a pump head in an embodiment of the present application;

Figure 14 is a front view of Figure 13;

FIG15 is an enlarged view of the contact between the limit block and the buckle at position C in FIG14;

FIG16 is a bottom view of the quick-change structure for the pump head in an embodiment of the present application;

FIG17 is a schematic structural diagram of a quick-change structure for a pump head in an embodiment of the present application;

FIG18 is a schematic structural diagram of a quick-change structure for a pump head in an embodiment of the present application;

FIG19 is a schematic structural diagram of a quick-change structure for a pump head in an embodiment of the present application;

FIG20 is a schematic structural diagram of a quick-change structure for a pump head in an embodiment of the present application;

FIG21 is a schematic structural diagram of the assembly of a magnetic levitation motor and a quick-change structure in an embodiment of the present application;

FIG22 is a schematic structural diagram of a magnetic levitation pump according to an embodiment of the present application;

FIG23 is a cross-sectional view of the magnetic levitation pump along the axial direction in an embodiment of the present application.

1. Quick-change structure; 10. Flange; 20. Limiting unit; 21. Limiting block; 210. First limiting portion; 211. Second limiting portion; 212. Groove; 2120. Top wall surface; 2121. Entry surface; 2122. Stop surface; 213. Accommodating chamber; 214. Blocking portion; 22. Buckle; 220. Top end surface; 221. First outer edge surface; 222. Second outer edge surface; 30. Locking unit; 31. Hook; 310. Hook body; 3100. Limiting groove; 311. Handle; 3110. Pressing portion; 3111. Anti-slip portion; 312. Hook; 32. Torsion spring; 320. First end portion; 321. Second end portion; 33. Pin; 34. Mounting hole; 40. Rubber plug; 50. Bolt hole;

60. Magnetic levitation pump; 61. Pump head; 610. Housing; 6100. Rotor cavity; 6101. Impeller cavity; 6102. Liquid outlet; 6103. Liquid inlet; 62. Magnetic levitation motor; 620. Cavity.

DETAILED DESCRIPTION

The following will be combined with the drawings in the embodiments of this application to clearly and completely describe the technical solutions in the embodiments of this application. Obviously, the embodiments described are only part of the embodiments of this application, not all of the embodiments. Based on the embodiments in this application, all other embodiments obtained by ordinary technicians in this field without making creative efforts are within the scope of protection of this application.

In the description of the present application, it should be noted that the terms "upper", "lower", "inner", "outer", etc., indicating orientations or positional relationships, are based on the orientations or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present application and simplifying the description, and do not indicate or imply that the devices or elements referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be understood as limiting the present application. The terms "including" and "having" and any variations thereof in the specification and claims of the present application and the above-mentioned drawings are intended to cover non-exclusive inclusions. For example, a system, product or device comprising a series of units is not necessarily limited to those units explicitly listed, but may include other units that are not explicitly listed or are inherent to these products or devices.

Furthermore, the terms "first," "second," and the like are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of the technical features being referred to. Thus, a feature specified as "first" or "second" may explicitly or implicitly include one or more of the features. In the description of this application, unless otherwise specified, "plurality" means two or more, unless otherwise explicitly specified.

The drawings in this disclosure are not drawn strictly to scale, and the specific size and quantity of each structure can be determined according to actual needs. The drawings described in this disclosure are only schematic diagrams.

At present, in the overall structure of the magnetic levitation pump, the magnetic levitation motor is directly fixedly connected to the pump head, and the pump head is placed on the upper end of the magnetic levitation motor. After adjusting the relative position of the two, multiple screws are inserted into the pump head and the magnetic levitation motor, and the screws are locked one by one to achieve a tight connection between the two. After a long period of use, if the pump head is damaged or needs to be replaced according to actual needs, all the screws connecting the magnetic levitation motor and the pump head need to be removed, the pump head is removed and a new pump head is installed, and then the multiple screws are tightened one by one. Therefore, the operation process is relatively cumbersome and inefficient when assembling and disassembling the pump head, and the operator needs to use both hands to install and replace the pump head, which requires a lot of time and labor costs. In addition, in actual use, due to different usage sites and specific needs, the magnetic levitation pump has the problem of needing to adjust the direction of the pump head outlet, that is, the installation direction of the pump head relative to the magnetic levitation motor. In this case, it is necessary to remove all the screws, rotate the relative position of the pump head with respect to the magnetic levitation motor to adjust the direction of the pump head outlet, and then lock the pump head after adjustment. The operation process is cumbersome and the purpose of quickly changing the assembly direction of the pump head cannot be achieved.

In order to solve the above problems, the embodiments of the present application provide a quick-change structure and a magnetic levitation pump for a pump head. The quick-change structure fixes the relative position of the pump head and the quick-change structure through the accommodating space formed by the flange and the limit block, and realizes the axial limitation of the buckle and the limitation of the pump head in and out directions through the first limit part, the second limit part and the locking unit, respectively, to achieve the purpose of quickly assembling and positioning the pump head, and there is no need to remove the flange. The pump head installation position can be quickly adjusted and the pump head can be replaced by turning the locking unit, and the replacement process meets the design requirements of one-handed installation and two-handed disassembly, is easy to operate, and has high assembly and disassembly efficiency, which greatly saves assembly time and labor costs and facilitates later maintenance.

In order to enable those skilled in the art to better understand the present application, the present application is further described in detail below with reference to Figures 1-23 and specific implementation methods.

According to an embodiment of the present application, the present application proposes a quick-change structure for a pump head, the pump head 61 includes a shell 610, the quick-change structure 1 includes a flange 10 and a limit unit 20, the limit unit 20 includes a plurality of limit blocks 21 and a plurality of clips 22, the plurality of limit blocks 21 are arranged at intervals along the circumferential direction on the upper end surface of the flange 10, the plurality of limit blocks 21 and the flange 10 constitute an accommodating space of the shell 610, and the plurality of clips 22 are arranged at intervals on the outer circumference of the shell 610, and the side of the limit block 21 adjacent to the pump head 61 is provided with a first limit portion 210 for axially limiting the clip 22 and a second limit portion 211 for limiting the screw-in direction of the pump head 61, and at least one limit block 21 is provided with a locking unit 30, which can rotate relative to the limit block 21 and limit the screw-out direction of the pump head 61.

1 and 3 , in the present embodiment, the pump head 61 includes a housing 610, and the housing 610 is quickly positioned by a quick-change structure 1, thereby realizing rapid positioning of the pump head 61. The quick-change structure 1 includes a flange 10 and a limiting unit 20. The flange 10 is disc-shaped. The limiting unit 20 includes a plurality of limiting blocks 21 and a plurality of snaps 22. The plurality of limiting blocks 21 are arranged on the upper end face of the flange 10 at intervals along the circumferential direction. Optionally, the plurality of limiting blocks 21 are arranged on the upper end face of the flange 10 at equal intervals. The limiting blocks 21 and the flange 10 can be integrally formed, or the limiting blocks 21 can be fixed to the flange 10 by fastener connection or welding. Those skilled in the art can determine the processing method of the limiting blocks 21 and the flange 10 according to actual needs and processes. The plurality of limiting blocks 21 and the flange 10 surround the accommodating space of the housing 610, and the housing 610 can be placed from top to bottom from the top of the accommodating space, so that the limiting blocks 21 limit the corresponding parts on the housing 610. A plurality of buckles 22 are arranged at intervals on the outer circumference of the housing 610. Optionally, a plurality of buckles 22 are arranged at equal intervals on the outer circumference of the housing 610. Each buckle 22 is placed from the opening between two adjacent limit blocks 21 to ensure the initial positioning of the relative position of the pump head 61 and the quick-change structure 1. The pump head 61 is placed in the accommodating space, and the side of the limit block 21 adjacent to the pump head 61, that is, the inner circumference side of the limit block 21, achieves the purpose of limiting the buckle 22. Specifically, when the pump head 61 rotates along the screw-in direction so that the buckle 22 enters the side of the limit block 21 adjacent to the pump head 61, the limit block 21 is provided with a first limiting portion 210 for axially limiting the buckle 22, and a second limiting portion 211 for limiting the screw-in direction of the pump head 61, and the screw-in direction is the direction shown by i 1 in Figure 10. In this embodiment, the first limiting portion 210 for axial limiting can be axially limiting the top of the buckle 22, or it can be axially limiting the bottom of the buckle 22. When the pump head 61 rotates along the screw-in direction until it abuts against the second limiting portion 211, the limiting block 21 can only limit the circumferential direction and screw-in direction of the pump head 61. The pump head 61 may also retreat in the opposite direction of the screw-in direction, i.e., the screw-out direction. Therefore, the screw-out direction of the pump head 61 is limited by providing a locking unit 30. The screw-out direction is the direction shown by i2 in Figure 16. At least one limiting block 21 is provided with a locking unit 30. The locking unit 30 can rotate relative to the limiting block 21 and limit the screw-out direction of the pump head 61. The number of locking units 30 can be determined by those skilled in the art according to actual needs. In this embodiment, providing one locking unit 30 can satisfy the requirement of limiting the screw-out direction of the pump head 61, thereby reducing production costs while satisfying the limiting function.

1 , in this embodiment, the first limiting portion 210 mainly serves the purpose of axially limiting the buckle 22. The length of the first limiting portion 210 and the length of the buckle 22 must be greater than the length of the buckle 22 to ensure that the first limiting portion 210 can be closely matched with the buckle 22 during the entire process from the time the buckle 22 enters the limiting block 21 to the time the buckle 22 rotates to the final position. The first limiting portion 210 needs to extend from one end of the limiting block 21 along the screw-in direction of the pump head 61, that is, from the position where the buckle 22 initially enters the limiting block 21 along the screw-in direction of the pump head 61, so as to ensure that when the buckle 22 rotates along the screw-in direction, the first limiting portion 210 always has a portion that can axially limit the buckle 22. The first limiting portion 210 can be axially limited by the top of the buckle 22 or by the bottom of the buckle 22. Optionally, when the buckle 22 rotates into the limit block 21, the first limit portion 210 is tightly fitted with the top of the buckle 22, and a friction force is applied to the top of the buckle 22 through the tight fit relationship, so as to further achieve axial limitation of the buckle 22. Optionally, the relative position of the pump head 61 and the quick-change structure 1 is limited mainly by the friction force provided by the first limit portion 210. The second limit portion 211 mainly serves to limit the screw-in direction of the buckle 22. When the pump head rotates along the screw-in direction, the second limit portion 211 provides a function of limiting the pump head 61 in the screw-in direction, that is, limiting the buckle 22 in the screw-in direction, limiting the movement stroke of the pump head 61 in the screw-in direction, so as to ensure that the pump head 61 is screwed in a suitable distance relative to the quick-change structure 1, and prevent the pump head 61 from being screwed out of the limit block 21.

Optionally, referring to Figures 5 and 6, the side of the limit block 21 in this embodiment adjacent to the pump head 61 is provided with a groove 212, and the groove 212 can realize the function of axially limiting the top of the buckle 22 and limiting the screw-in direction of the pump head 61. The groove 212 extends from one end of the limit block 21 along the screw-in direction, that is, it extends from the position where the buckle 22 initially enters the limit block 21. The setting position of the groove 212 in the axial direction of the limit block 21 can be determined according to the position of the buckle 22 relative to the housing 610 in the axial direction. Optionally, the groove 212 is provided at the bottom of the side of the limit block 21 adjacent to the pump head 61, ensuring that the limit block 21 has sufficient mechanical strength while meeting the design requirements of the relative position of the pump head 61 and the quick-change structure 1. In this embodiment, the top wall 2120 of the groove 212 is configured as the first limiting portion 210 to achieve the purpose of axially limiting the buckle 22; the inner wall 2121 of the groove 212 is configured as the second limiting portion 211 to achieve the purpose of limiting the screwing direction of the pump head 61. The shape of the groove 212 matches the shape of the buckle 22, and the axial dimension of the groove 212 is substantially consistent with the axial dimension of the buckle 22. While ensuring that the buckle 22 can be screwed into the groove 212, the top wall 2120 of the groove 212 can tightly fit with the top of the buckle 22, and the top wall 2120 of the groove 212 provides a friction force to the top of the buckle 22. The circumferential dimension of the groove 212 is larger than the circumferential dimension of the buckle 22, ensuring that the groove 212 has sufficient space in the circumferential direction to allow the buckle 22 to rotate and fit within the groove 212, thereby limiting the screwing direction of the pump head 61.

Optionally, since the groove 212 needs to limit the screw-in direction of the pump head 61, the groove 212 needs to have a surface that blocks the limit block in the screw-in direction to limit the movement of the pump head 61 in the screw-in direction. The groove has a top wall surface 2120 and a stop surface 2122. Referring to Figure 2, the first limiting portion is configured as the top wall surface 2120 of the groove to achieve the purpose of axially limiting the top of the buckle 22. The second limiting portion is configured as the stop surface 2122 of the groove. The stop surface 2122 is configured at the tail of the groove along the screw-in direction of the pump head, that is, the limiting buckle 22 can only rotate within the space formed by the top wall surface 2120 and the stop surface 2122, to prevent the buckle 22 from rotating out of the limit block.

In addition, the groove also includes an entry surface 2121. The entry surface 2121 and the stop surface 2122 are sequentially arranged along the screw-in direction of the pump head to form the side wall surface of the groove. Since the side wall surface is a uniformly extended surface without bending, it is impossible to block the movement of the pump head 61 in the screw-in direction. Therefore, in this embodiment, the side wall surface of the groove 212 is configured to form a certain angle α, that is, the entry surface 2121 and the stop surface 2122 form a certain angle α. In order to ensure that the stop surface 2122 can play a blocking role, the range of the angle α between the entry surface 2121 and the stop surface 2122 needs to be configured to be 90°≤α＜180°. In this way, the stop surface 2122 can play a blocking role on the pump head 61. The specific shapes of the entry surface 2121 and the stop surface 2122 can be determined by those skilled in the art according to actual needs. For example, optionally, the inner wall surface 2121 is sequentially configured as an arc surface and an inclined surface along the screw-in direction of the pump head. In addition, the inner wall surface 2121 is also configured as a plane and an inclined surface in sequence along the screw-in direction of the pump head, including but not limited to this, and the shape of the buckle 22 is set accordingly according to the shape of the groove 212. The entry surface 2121 is set as an arcuate surface, and the portion of the buckle 22 that cooperates with the entry surface 2121 is also set as an arcuate surface. The arcuate surface facilitates the rotation of the buckle 22 relative to the groove 212, and the rotation is relatively labor-saving, so as to ensure that the buckle can smoothly enter the limit block, which is convenient for the operator to rotate the pump head with one hand to achieve rapid positioning of the pump head and the quick-change structure. And because the pump housing is circular, multiple arcuate surfaces are approximately enclosed to form a circle and are configured as concentric circles with the housing 610, which facilitates the relative positioning of the pump head 61 and the quick-change structure 1, while making the rotation of the pump head 61 relatively labor-saving. In this embodiment, the stop surface 2122 is set as an inclined surface, and the inclined surface serves the purpose of limiting the screw-in direction of the pump head 61. When the pump head 61 rotates along the screw-in direction until the outer edge of the buckle 22 abuts against the stop surface 2122, the part where the buckle 22 cooperates with the stop surface 2122 is also set as a slope, and the two slopes abut more firmly, and the pump head 61 cannot rotate further. When the pump head 61 moves to this position, it proves that the pump head 61 has rotated to the maximum movement stroke. At this time, the stop surface 2122 blocks the further rotation of the buckle 22, and further blocks the further rotation of the pump head 61. When the operator rotates to this position, he stops rotating the pump head 61 along the screw-in direction, ensuring that the relative position of the pump head 61 relative to the quick-change structure 1 is fixed.

Optionally, in this embodiment, at least one of the limit blocks 21 is provided with an accommodating cavity 213, specifically refer to Figure 9. The number of accommodating cavities 213 is adapted to the number of locking units 30. A mounting hole 34 is provided at the bottom of the accommodating cavity, and a rotating connector is provided in the mounting hole 34, and the rotating connector is passed through the bottom of the mounting hole 34 into the interior of the accommodating cavity. The top of the rotating connector can be located inside the top of the accommodating cavity or below the top wall of the accommodating cavity or pass through the top of the accommodating cavity. The top of the rotating connector is located inside the top of the accommodating cavity or below the top wall of the accommodating cavity, which ensures that the mounting hole 34 of the rotating connector is not exposed at the top of the limit block, making the limit block more beautiful.

In this embodiment, a locking unit 30 is correspondingly configured in a receiving cavity 213. The locking unit 30 is rotatably connected to the limit block 21 through the rotating connection member, and the locking unit 30 can perform rotational movement toward the pump head 61 and rotational movement away from the pump head 61 in the receiving cavity 213. The receiving cavity 213 is configured as a placement space for the locking unit 30 and limits the movement stroke of the locking unit 30 rotating toward the pump head 61 and rotating away from the pump head 61. When the pump head 61 rotates in the screw-in direction and the buckle 22 enters one end of the limit block 21, the buckle 22 abuts against the locking unit 30 and pushes the locking unit 30 to rotate away from the pump head 61, so as to make room for the buckle 22 to rotate in the screw-in direction. Then, the locking unit 30 rotates toward the pump head 61 and limits the buckle 22 in the screw-out direction, thereby preventing the pump head 61 from rotating in the screw-out direction and disengaging from the quick-change structure 1.

7 and 8 , in the present embodiment, the locking unit 30 includes a hook 31 and a torsion spring 32. The hook 31 includes a hook body 310, a handle 311 and a hook portion 312. The handle 311 and the hook portion 312 are respectively arranged at the two ends of the hook body 310, and the handle 311 is configured so that the operator pushes the hook 31 to rotate, and the hook portion 312 is configured to abut against the limit block 21 to achieve the limit of the direction in which the pump head 61 is screwed out. The hook body 310, the handle 311 and the hook portion 312 can be integrally formed or fixedly connected together by fasteners. In the present embodiment, it is preferably integrally formed so that the hook 31 is easy to process and the hook 31 is relatively round as a whole. The hook body 310 is rotatably connected to the limit block 21 by a pin 33, so that the hook 31 rotates toward the pump head 61 and rotates away from the pump head 61. The shape of the handle 311 is roughly "L"-shaped. The handle 311 is configured to extend at one end of the hook body 310 at a certain angle. The angle can be a right angle or an obtuse angle. The specific angle can be determined by technical personnel in this field according to actual needs to facilitate the application of force points and facilitate pushing or pressing the hook 31.

Optionally, in this embodiment, the rotatable connection member can be configured as a pin, with the hook 31 and the stop block 21 rotatably connected via a pin 33. Specifically, a mounting hole 34 is provided along the axial direction of the accommodating cavity 213, and the pin 33 is disposed within the mounting hole 34 to achieve the rotatable connection between the hook 31 and the stop block 21. A torsion spring 32 is disposed on the pin 33 and above the hook body 310. The axial position of the pin 33 relative to the stop block 21 is determined according to actual usage and is not limited here. Optionally, a mounting hole 34 is provided at the bottom of the accommodating cavity 213. Referring to FIG15 , a pin 33 extends from the bottom of the mounting hole 34 through the mounting hole 34, the hook body 310, and the torsion spring 32, so that the hook body 310 and the torsion spring 32 are all rotatably connected to the stop block 21 via the pin 33. In this embodiment, a preset gap is provided between the top of the pin 33 and the top wall of the accommodating cavity 213, or the top of the pin 33 is inserted into the top of the accommodating cavity 213, so that the top surface 220 of the stop block 21 is smooth and flat, without exposing the mounting hole 34, which is more aesthetically pleasing. This design ensures that the hook 31 can rotate relative to the stop block 21 while improving the aesthetics of the quick-change mechanism 1. In addition, a mounting hole 34 can be provided at the top of the accommodating cavity 213, and the pin shaft 33 passes through the mounting hole 34, the torsion spring 32 and the hook body 310 in sequence from the top of the mounting hole 34, so that the hook body 310 and the torsion spring 32 are all rotatably connected to the limit block 21 through the pin shaft 33. In this embodiment, the bottom of the pin shaft 33 is connected to the bottom of the limit block 21, and the top of the limit block 21 can see the top of the pin shaft 33 and the connection point.

Optionally, in this embodiment, to ensure interaction between the hook body 310 and the torsion spring 32, a limiting groove 3100 is provided on the hook body 310. The first end 320 of the torsion spring 32 is disposed within the limiting groove 3100, while the second end 321 of the torsion spring 32 abuts the sidewall of the accommodating chamber 213. The first end 320 abuts the limiting groove 3100 at both ends along its length, preventing the first end 320 from moving within the limiting groove 3100. Furthermore, the position of the second end 321 is fixed by the sidewall of the accommodating chamber 213. This allows the hook 31 to rotate away from the pump head 61 while simultaneously compressing the torsion spring 32 to a certain distance. The compressed distance of the torsion spring 32 in turn provides a rebound force, driving the hook 31 to rotate toward the pump head 61, thereby achieving interaction between the hook 31 and the torsion spring 32. In this embodiment, the relative position setting of the hook 31 and the torsion spring 32 can not only realize that the hook 31 rotates back toward the pump head 61 under the push of the buckle 22 while compressing the torsion spring 32, but also can drive the hook 31 to automatically rotate toward the pump head 61 under the rebound force of the torsion spring 32 to achieve the limitation of the direction of the pump head 61 being screwed out. The hook 31 and the torsion spring 32 interact with each other. The operator only needs to rotate the pump head 61 with one hand to realize the automatic locking function of the hook 31, thereby realizing the function of screwing in and limiting the pump head 61. The operation is simple, which greatly improves the efficiency of assembling and disassembling the pump head 61.

The axial orientation of the torsion spring in this application is determined by actual usage and is not limited here. The hook body 310 and the torsion spring 32 can be oriented toward the top wall of the accommodating chamber 213 or toward the bottom of the accommodating chamber 213 within the accommodating chamber 213. Optionally, the torsion spring 32 in this embodiment is disposed between the bottom wall of the accommodating chamber 213 and the hook body 310, that is, the side of the hook body 310 where the upper limit groove 3100 is located is adjacent to the bottom wall of the accommodating chamber 213, the limit groove is close to the bottom wall of the accommodating chamber 213, and the pin connects the mounting hole 34, the torsion spring 32, and the hook body 310 in sequence from the bottom of the accommodating chamber 213. In this embodiment, a torsion spring 32 is provided between the hook body 310 and the bottom wall of the accommodating chamber 213, so that there is no direct contact between the hook body 310 and the bottom wall of the accommodating chamber 213. This prevents the hook body 310 from rotating for a long time and causing friction between the hook body 310 and the bottom wall of the accommodating chamber 213 to generate debris, which could affect the normal rotation of the hook and even damage the hook body 310, thereby affecting the locking unit's function of limiting the pump head. The contact surface between the hook body 310 and the torsion spring 32 is relatively small, and the friction surface of the hook body 310 during rotation is also relatively small, which to a certain extent reduces the loss of the hook body 310 and the debris generated by rotational friction. In this embodiment, the pin shaft is axially higher than the hook body 310, so that the pin shaft is fixed by a cotter pin at the end that is higher than the hook body.

Furthermore, the torsion spring 32 in this embodiment can also be disposed between the top wall of the accommodating cavity 213 and the hook body 310. Specifically, the side of the hook body 310 where the upper limit groove 3100 is located is adjacent to the top wall of the accommodating cavity 213, with the upper limit groove 3100 being close to the top wall of the accommodating cavity 213. A pin connects the mounting hole 34, the hook body 210, and the torsion spring 32 in sequence from the bottom of the accommodating cavity 213. In this embodiment, the bottom of the hook body 210 contacts the bottom wall of the accommodating cavity 213, generating friction between the hook body 210 and the bottom wall of the accommodating cavity 213 during rotation, thereby generating debris. Compared to a case where the torsion spring 32 is disposed between the bottom wall of the accommodating cavity 213 and the hook body 310, the service life of the hook body in this embodiment is slightly shorter. However, in this embodiment, the hook and torsion spring 32 are disposed toward the top wall of the accommodating cavity 213, making installation more convenient. In this embodiment, the pin shaft is higher in the axial direction than the torsion spring 32 , so that the pin shaft is fixed by a cotter pin at one end higher than the torsion spring 32 .

Optionally, in this embodiment, a handle extends from one end of the hook body away from the hook portion toward the hook portion. The handle is provided with a portion for the operator to apply pressure with his hand, which is defined as a pressure-applying portion 3110 in this embodiment. Optionally, the pressure-applying portion 3110 in this embodiment extends along the circumferential direction of the pump head. The pressure-applying portion 3110 extends in an arc shape downward and then upward along the screwing direction of the pump head. Referring to Figure 8, the portion extending in an arc shape upward is the portion that the operator presses. To facilitate the operator's use, the portion extending in an arc shape upward is provided with an anti-slip portion 3111. The length of the pressure-applying portion 3110 extending in the circumferential direction depends on the space that the quick-change structure 1 has in the circumferential direction. Since the magnetic levitation motor 62 and the pump head 61 are both arranged in the axial direction of the quick-change structure 1, no other structure is provided in the circumferential direction to block the handle body 3110. The pressure-applying portion 3110 extends in the circumferential direction for the operator to contact the pressure-applying portion 3110 and press it to rotate back toward the pump head. The design of the handle 311 structure in this embodiment is not only more beautiful, but also easier for the operator to operate. When disassembling the pump head, the operator only needs to press the pressure-applying portion 3110 in the direction toward the limit block to disengage the hook of the hook from the buckle. The handle can be pressed with less pressing force, and the operation is more convenient and labor-saving.

In addition, the pressure-applying portion 3110 in this embodiment extends upward or downward in the axial direction. Referring to Figure 7, the angle may be a right angle or an obtuse angle. The specific angle can be determined by those skilled in the art according to actual needs, so as to facilitate the application of the force point and facilitate the pushing of the hook 31. The length of the extension of the handle body 3110 depends on the space provided on the upper or lower side of the quick-change structure 1 to avoid interference between the handle body 3110 and the magnetic levitation motor 62 or the pump head 61 in the axial direction. When removing the pump head, the operator needs to contact the pressure-applying portion 3110 and rotate the handle in the direction away from the pump head. A certain driving force must be applied to achieve the rotation of the handle. For pump heads and locking units of the same specifications, the pulling force will be greater than the pressing force, and the operator will be more laborious when operating. Of course, the shape of the handle includes but is not limited to this. Those skilled in the art can design the shape of the handle according to actual needs.

When the pump head is small, the quick-change structure is also small, and the handle 311 is also small. The operator may easily slip when dialing. In order to solve this problem, the present application provides an anti-slip portion 3111 on the outer edge surface of the pressure portion 3110 of the handle. Optionally, the anti-slip portion 3111 is provided on the outer edge surface contacted when the operator presses the pressure portion 3110 or dials the pressure portion 3110, with reference to FIG8 . The anti-slip portion 3111 can be configured as an anti-slip pattern or an anti-slip protrusion, and the anti-slip pattern can be configured as a thread or a pattern, including but not limited to the above. As long as the anti-slip portion 3111 can achieve the purpose of anti-slip when pressing or dialing the handle 311, that is, pressing the pressure portion 3110 or dialing the pressure portion 3110, it can be sufficient. When the operator presses or moves the handle 311, the anti-slip portion 3111 can increase the friction between the operator's hand and the handle body 3110, preventing the operator's hand from slipping on the handle 311 without pressing or moving the handle 311. This helps save time in assembling and disassembling the pump head 61, thereby improving efficiency. Of course, the shape of the handle 311 and the design of the anti-slip portion 3111 include but are not limited to these. As long as the function of pressing or moving the hook 31 can be achieved, it falls within the scope of protection of this application. Those skilled in the art can design the shape of the handle 311 and the shape and position of the anti-slip portion 3111 according to actual needs to facilitate operation by the operator.

Optionally, in this embodiment, one end of the limit block 21 and the top of its inner side form a blocking portion 214. Referring to Figure 9, the blocking portion 214 is the portion of the limit block 21 on the side adjacent to the pump head 61. The pump head 61 needs to be inserted from top to bottom into the accommodating space formed by the flange 10 and the limit block 21. In order for the pump head 61 to be smoothly inserted, there needs to be no obstruction in the axial direction to block the movement of the pump head 61 in the axial direction, and the hook 31 can rotate relative to the pump head 61. The maximum movement stroke of the hook 31 is greater than the axial length of the accommodating space. If the hook 31 is allowed to move to its maximum movement stroke, the hook 31 will protrude too much from the groove 212 in the radial direction, affecting the smooth insertion of the pump head 61. Therefore, the part of the side of the limit block 21 adjacent to the pump head 61 and one end thereof are configured as a blocking portion 214, so that the hook 31 and the torsion spring 32 have an interaction force in the initial state, the torsion spring 32 has a certain amount of compression, and the hook portion 312 of the hook 31 abuts against the blocking portion 214, limiting the rotation stroke of the limit hook 31 toward the pump head 61, thereby preventing the hook 31 from protruding too much from the limit block 21 in the radial direction, affecting the smooth insertion of the pump head 61. In addition, the setting of the blocking portion 214 makes it possible for the hook portion 312 to abut against the blocking portion 214, and the hook 31 still tends to move toward the pump head 61 under the action of the rebound force of the torsion spring 32, and the blocking portion 214 then blocks the hook 31 from moving toward the pump head 61. The hook 31 will no longer rotate except under the action of manpower. After the pump head 61 is screwed into the limit block 21 and fixed relative to the quick-change structure 1, the pump head 61 will have the problem of rotating in the screw-out direction, and the hook 31 can just block the pump head 61 from rotating in the screw-out direction, thereby preventing the pump head 61 from detaching from the quick-change structure 1.

Optionally, in this embodiment, the buckle has a top surface 220, a first outer edge surface 221, and a second outer edge surface 222 that cooperate with the groove, refer to Figure 4. The top surface 220 is configured as an inclined surface that tilts downward toward the screw-in direction of the pump head, so that when the buckle is screwed into the quick-change structure, the top wall surface 2120 of the groove can slowly and tightly cooperate with the inclined surface until the top wall surface 2120 is tightly fitted with the highest point of the buckle, applying a downward pushing force to the buckle, so that the pump head and the motor cooperate more tightly. The first outer edge surface 221 and the second outer edge surface 222 are arranged in sequence along the screw-in direction of the pump head, the first outer edge surface 221 is configured as an arc-shaped surface that cooperates with the entry surface 2121, and the second outer edge surface 222 is configured as an inclined surface that tilts downward toward the screw-in direction of the pump head to cooperate with the stop surface 2122. The first outer edge surface 221 may or may not abut against the buckle 22. When the first limiting portion 210, i.e., the top wall surface 2120 of the groove, provides a greater friction force on the top of the buckle 22, if the first outer edge surface 221 abuts against the buckle 22, the pump head 61 will be subjected to two forces in the axial direction and the rotational direction, and the pump head 61 will be difficult to rotate. Therefore, when the first outer edge surface 221 does not abut against the buckle 22, the first outer edge surface 221 only needs to achieve the purpose of limiting the movement stroke of the pump head 61 along the rotational direction.

Optionally, in this embodiment, a rotor chamber 6100 and an impeller chamber 6101 are formed in the housing 610, refer to Figure 3. The rotor chamber 6100 is arranged on one side of the impeller chamber 6101. The radial dimension of the rotor chamber 6100 is smaller than the radial dimension of the impeller chamber 6101. The buckle 22 is arranged on the outer circumference of the impeller chamber 6101 and the bottom of the buckle 22 is located on the same plane as the bottom of the impeller chamber 6101. When the pump head 61 is placed in the accommodation space, the rotor chamber 6100 is placed at the lower part of the flange 10, and the impeller chamber 6101 is placed at the upper part of the flange 10, so that the upper end surface of the flange 10, the bottom of the buckle 22, and the bottom of the impeller chamber 6101 are located on the same radial plane, so that the relative position of the pump head 61 relative to the quick-change structure 1 meets the design requirements while ensuring that the quick-change structure 1 has good mechanical strength. A liquid outlet 6102 is formed on the housing 610 to communicate with the interior of the impeller chamber 6101. The opening between two adjacent limit blocks 21 is configured as a placement opening for the liquid outlet 6102. Multiple limit blocks 21 form multiple placement openings for the liquid outlet 6102. When the liquid outlet direction of the pump head 61 needs to be changed, it is only necessary to remove the pump head 61 from the quick-change structure 1 and change the placement position of the liquid outlet 6102 relative to the limit block 21 to adjust the installation direction of the pump head 61. The operation is simple and the purpose of replacing the installation direction of the pump head 61 can be achieved without disassembling the quick-change structure 1. In this embodiment, the number of installation directions of the pump head 61 depends on the number of limit blocks 21. For example, four limit blocks 21 are set on the flange 10, and the opening between two adjacent limit blocks 21 is a placement opening for a pump head 61. The four limit blocks 21 have four openings, and the pump head 61 can achieve four installation directions at different angles to meet different needs.

Optionally, in this embodiment, the direction in which the liquid outlet 6102 is placed is the direction in which the pump head 61 is placed, and the position and number of the liquid outlet 6102 are not limited. In one embodiment, the liquid outlet 6102 is arranged on the circumferential side of the pump housing, and the number of the liquid outlet 6102 is not limited. For example, it can be one or two liquid outlets 6102 along the tangential direction of the circumference. In one embodiment, the pump housing may include a top cover and a lower housing, and the liquid outlet 6102 is formed on the lower housing. In order to ensure that when the liquid outlet 6102 is placed between the openings of adjacent limit blocks 21, the buckle 22 can also move a certain stroke and correspond to the limit blocks 21. Therefore, when designing the buckle 22, the number of buckles 22 set in the circumferential direction of the housing 610 is taken into account. In order to meet the above requirements, a buckle 22 is provided near the position of the liquid outlet 6102, and the liquid outlet 6102 and the buckle 22 adjacent to it are simultaneously arranged in the opening area between adjacent limit blocks 21. The liquid outlet and a buckle are arranged in the placement port. In this embodiment, firstly, to ensure that the liquid outlet 6102 and the entire portion of the adjacent buckle 22 can be completely inserted into the opening between two adjacent limiting portions, the circumferential distance between the side of the buckle facing away from the liquid outlet and the side of the liquid outlet facing away from the buckle is less than or equal to the circumferential distance of the placement opening. Secondly, to ensure that there is no circumferential interference between the liquid outlet 6102 and the limiting block 21 as the buckle 22 rotates from one end of the groove 212 to the other end of the groove 212, the circumferential distance between the side of the buckle facing away from the liquid outlet and the side of the liquid outlet facing the buckle is greater than or equal to the circumferential distance of the groove. This ensures that after the buckle 22 rotates to its maximum stroke in the screwing direction, the liquid outlet 6102 and the limiting block 21 abut or still have a certain circumferential distance, thereby meeting the design requirement that the pump head 61 can be properly assembled within the quick-change structure 1.

The specific working principle of the quick-change structure 1 provided in the above embodiment is as follows: when the pump head 61 rotates along the screw-in direction until the buckle 22 abuts against the hook 312, as shown in Figure 11, the pump head 61 continues to rotate, and the buckle 22 abutting against the hook 31 pushes the hook 31 to rotate back toward the pump head 61, as shown in Figures 14 and 15, and then the hook 31 drives the torsion spring 32 to rotate back toward the pump head 61, as shown in the direction i3 in Figure 1, and the torsion spring 32 produces a certain amount of compression; when the buckle 22 passes over the hook 312 12 , the hook 31 rotates until it abuts against the blocking portion 214, as shown in FIG13 , thereby limiting the pump head 61 in the direction of screwing out. The pump head 61 is further rotated until the buckle 22 abuts against the inner wall surface 2121 of the groove 212, thereby limiting the pump head 61 in the direction of screwing in. The top wall surface 2120 of the groove 212 limits the top of the buckle 22 in the axial direction.

Optionally, the quick-change structure 1 also includes at least one rubber stopper 40, refer to Figure 15. A blind hole is provided on one side of the limit block 21 adjacent to the pump head 61, and the blind hole is provided in the portion of the stop surface 2122 of the groove 212. The rubber stopper 40 is correspondingly configured in the blind hole and protrudes in the radial direction to abut against the buckle 22. When the pump head 61 rotates until the second outer edge surface 222 of the buckle 22 abuts against the stop surface 2122 of the groove 212, the rubber stopper 40 then serves to limit the circumferential and radial directions of the buckle to prevent the buckle from moving. The blind hole can extend in the axial direction, refer to Figure 16, or extend in the radial direction, refer to Figure 17, including but not limited to this, it is only necessary to ensure that the rubber stopper 40 is configured in the blind hole to abut against the buckle 22, and further apply a rotational force in the direction of screwing out to the pump head 61.

As the pump head 61 rotates to the maximum movement stroke with the groove 212, that is, when the inclined surface of the buckle 22 abuts the inclined surface of the groove 212, as shown in Figures 12 and 13, the pump head 61 stops moving. However, since the pump head 61 only has the top wall surface 2120 of the groove 212 to exert friction on it at this time, which acts as a limit in the axial direction, when the pump head 61 rotates to the point where the buckle abuts the stop surface 2122, the hook portion does not hook the side of the buckle adjacent to the hook portion. At this time, the pump head will have the problem of rotating in the circumferential direction, which to a certain extent affects the stable assembly of the pump head 61 relative to the quick-change structure 1. In the present application, the side of the buckle adjacent to the hook portion is configured as an inclined surface, and the inclined surface matches the shape of the hook portion so that the hook portion can firmly hook the inclined surface. In order to enable the hook to hook the side of the buckle adjacent to the hook, a rubber plug is provided on the stop surface 2122 in this embodiment. When the pump head rotates until the second outer edge surface 222 of the buckle abuts the stop surface 2122, the buckle abuts the rubber plug in the radial direction. At this time, the rubber plug will apply a circumferential component force to the buckle. This component force is directed toward the direction of the pump head to rotate a certain distance in the direction of the pump head to abut against the hook on the side of the buckle adjacent to the hook, ensuring that the pump head no longer rotates, thereby fixing the position of the pump head relative to the quick-change structure and achieving stable assembly of the pump head. The rubber plug 40 can increase the friction force of the buckle in the circumferential and radial directions. The circumferential friction force causes the buckle 22 to slide back, further making the pump head 61 more firmly fixed. In this embodiment, the number of blind holes is set to 1, and the number of blind holes depends on the number of rubber plugs that need to be set. One blind hole can prevent the pump head 61 from automatically rotating a certain distance in the screw-out direction after being rotated to the right position in the screw-in direction, while reducing production costs and processes. The blind hole is preferably arranged on the limit block 21 where the locking unit 30 is not provided, so that there is enough space on the side of the limit block 21 adjacent to the pump head 61 to open the blind hole.

It should be noted that the number of rubber stoppers 40 includes one but is not limited to this. The number and specific positions of the rubber stoppers 40 can be determined by those skilled in the art according to actual needs. In the present application, since the pump head 61 is relatively small in size, one rubber stopper 40 can achieve the purpose of limiting the direction in which the pump head 61 is screwed out. Therefore, the present application only requires one small rubber stopper.

In the present application, the limit blocks 21 correspond to the buckles 22 one by one, and the number of the two is equal, and the number of the locking units 30 is less than or equal to the number of the limit blocks 21 or the buckles 22. The limit blocks 21 and the buckles 22 recorded in the drawings disclosed in the present application are configured as 4, and the locking unit 30 is configured as 1, which is an optional embodiment of the present application. However, the number of limit blocks 21, buckles 22 and locking units 30 includes but is not limited to this, and those skilled in the art can set the number of limit blocks 21, buckles 22 and locking units 30 according to actual needs. In this embodiment, the four limit blocks 21 constitute the four installation directions of the pump head 61, and the opening between two adjacent limit blocks 21 is an installation direction of the pump head 61, so that the installation direction of the pump head 61 can be selected in multiple ways to meet actual use needs. Since the pump head 61 in this application is relatively small in size, one locking unit 30 can limit the rotational direction of the pump head 61. Therefore, one locking unit 30 is set to save costs while meeting the function of limiting the rotational direction of the pump head 61.

The present application also discloses a magnetic levitation pump 60, as shown in Figures 21 and 22. In this embodiment, the magnetic levitation pump 60 includes a magnetic levitation motor 62, a pump head 61, and a quick-change structure 1 for the pump head 61. The pump head 61 includes a housing 610 and a rotor impeller disposed within the housing 610. The housing 610 includes a rotor cavity 6100 and an impeller cavity 6101. The rotor cavity 6100 is disposed on one side of the impeller cavity 6101, and the radial space of the rotor cavity 6100 is smaller than the radial space of the impeller cavity 6101. The rotor portion of the rotor impeller is disposed within the rotor cavity 6100, and the blade portion of the rotor impeller is disposed within the impeller cavity 6101. The housing 610 is also formed with a liquid inlet 6103 and a liquid outlet 6102 that communicate with the impeller chamber 6101. In one embodiment, the liquid inlet 6103 is located at the top center of the housing 610, and the liquid outlet 6102 is located on the circumference of the housing 610. The pump head 61 is fixed to the magnetic levitation motor 62 via a quick-change structure 1. By first locking the quick-change structure 1 to the magnetic levitation motor 62 and then assembling the pump head 61 on the quick-change structure 1, the quick-change structure 1 can achieve the purpose of rapid assembly, disassembly, and replacement of the pump head 61 and the motor, avoiding the traditional structure that requires multiple screws to fix the pump head 61 to the motor, thereby greatly improving the assembly and replacement efficiency of the pump head 61. The magnetic levitation motor 62 includes a stator. The magnetic body of the rotor portion of the rotor impeller corresponds to the stator of the magnetic levitation motor 62. The stator is configured to generate a magnetic field to drive the rotor impeller to rotate and levitate.

Optionally, in order to ensure that the quick-change structure 1 can be firmly fixed on the magnetic levitation motor 62, a plurality of bolt holes 50 are provided at intervals in the circumferential direction of the flange 10, and corresponding bolt holes 50 are provided on the magnetic levitation motor 62. Bolts are passed through the bolt holes 50 on the flange 10 and the bolt holes 50 on the magnetic levitation motor 62 in sequence to achieve a fixed connection between the quick-change structure 1 and the magnetic levitation motor 62. The position of the bolt holes 50 on the flange 10 is preferably configured at the outer edge of the limit block 21, and the number of the bolt holes 50 is preferably configured to be equal to the number of the limit blocks 21, that is, one bolt hole 50 is provided at the outer edge of each limit block 21. Of course, the position and number of the bolt holes 50 include but are not limited to these. Those skilled in the art can set the position and corresponding number of the bolt holes 50 on the flange 10 according to actual needs to meet the purpose of firmly fixing the quick-change structure 1.

In addition to the axial limiting, inward and outward limiting of the pump head 61 by the quick-change structure 1, the magnetic levitation motor 62 can also limit the pump head 61 radially, so that the pump head 61 is more firmly mounted on the magnetic levitation motor 62. Optionally, a cavity 620 is provided inside the magnetic levitation motor 62. As shown in FIG23 , the cavity 620 is preferably located in the middle of the magnetic levitation motor 62 and extends inward from the end of the magnetic levitation motor 62. A stator is provided inside the magnetic levitation motor 62. The stator corresponds radially to the rotor portion of the rotor impeller. Therefore, the rotor portion of the rotor impeller is disposed within the cavity 620 of the magnetic levitation motor 62. Since the rotor portion of the rotor impeller is disposed within the rotor cavity 6100, the rotor cavity 6100 is also disposed within the cavity 620. When the rotor cavity 6100 is placed within the cavity 620, the outer wall of the rotor cavity 6100 abuts against the inner wall of the cavity 620 to radially limit the pump head 61.

In the present application, the specific assembly method of the magnetic levitation pump 60 is to first fix the quick-change structure 1 on the top of the magnetic levitation motor 62 by bolts, and then put the pump head 61 from top to bottom into the magnetic levitation motor 62. The rotor cavity 6100 of the pump head 61 is correspondingly placed in the cavity 620 of the magnetic levitation motor 62 and abuts against it to achieve radial limitation of the rotor cavity 6100 by the cavity 620; then rotate the pump head 61 in the screwing direction so that the buckle 22 on the housing 610 rotates. When the pump head 61 is disassembled, the handle 311 of the hook 31 is moved in the direction away from the pump head 61, as shown in FIG18 , so that the hook portion 312 of the hook 31 does not contact the blocking portion 214. At this time, the pump head 61 is rotated in the direction of screwing out, as shown in FIG19 , so that the hook 312 of the hook 31 does not contact the blocking portion 214. At this time, the pump head 61 is rotated in the direction of screwing out, as shown in FIG19 , so that the hook 22 is disengaged from the limit block 21, and the pump head 61 is removed from the magnetic levitation motor 62 from bottom to top.

Specific embodiments are used in this application to illustrate the principles and implementation methods of this application. The description of the above embodiments is only used to help understand the technical solution and core ideas of this application. At the same time, for those skilled in the art, according to the ideas of this application, there will be changes in the specific implementation methods and application scope. In summary, the content of this specification should not be understood as limiting this application.

Industrial Applicability

To sum up, the embodiments of the present disclosure provide a quick-change structure for a pump head and a magnetic levitation pump, which can realize rapid assembly and positioning of the pump head without removing the flange, and the replacement process meets the design requirements of one-handed installation and two-handed disassembly. It is easy to operate, and the assembly and disassembly efficiency is high, which greatly saves assembly time and labor costs and facilitates later maintenance.

Claims (20)

A quick-change structure for a pump head, the pump head includes a shell (610), characterized in that the quick-change structure (1) includes a flange (10) and a limit unit, the limit unit includes a plurality of limit blocks (21) and a plurality of buckles (22), the plurality of limit blocks are arranged at intervals on the upper end surface of the flange along the circumferential direction, the plurality of limit blocks and the flange constitute a accommodating space of the shell, the plurality of buckles are arranged at intervals on the outer circumference of the shell, the side of the limit block adjacent to the pump head is provided with a first limit portion (210) for axially limiting the buckle and a second limit portion (211) for limiting the screw-in direction of the pump head, at least one of the limit blocks is provided with a locking unit (30), the locking unit can rotate relative to the limit block and limit the screw-out direction of the pump head. The quick-change structure for a pump head according to claim 1 is characterized in that the first limiting portion extends from one end of the limiting block along the screwing direction of the pump head, and when the buckle rotates into the limiting block, the first limiting portion fits tightly with the top of the buckle. The quick-change structure for a pump head according to claim 2 is characterized in that a groove (212) is provided at the bottom of one side of the limit block adjacent to the pump head, the groove cooperates with the buckle, the groove has a top wall surface (2120) and a stop surface (2122), the first limit portion is configured as the top wall surface of the groove, and the second limit portion is configured as the stop surface of the groove. The quick-change structure for a pump head according to claim 3 is characterized in that the groove further includes an entry surface (2121), the entry surface and the stop surface are arranged in sequence along the screw-in direction of the pump head, and the entry surface and the stop surface form a certain angle α, wherein 90°≤α＜180°, the entry surface is configured as an arc surface, the stop surface is configured as an inclined surface, the entry surface approximately forms a circle and is configured as a concentric circle with the shell, and the stop surface can abut against the inclined surface of the buckle. The quick-change structure for a pump head according to any one of claims 1 to 4 is characterized in that a receiving cavity (204) is provided in at least one of the limit blocks, a mounting hole (34) is provided at the bottom of the receiving cavity, a rotating connecting piece is provided in the mounting hole, and the locking unit is arranged in the receiving cavity and is rotatably connected to the limit block through the rotating connecting piece. The quick-change structure for a pump head according to claim 5 is characterized in that the locking unit (30) includes a hook (31) and a torsion spring (32), the hook includes a hook body (310), a handle (311) and a hook portion (312), the handle and the hook portion are respectively arranged at both ends of the hook body, the rotating connecting member is configured as a pin shaft, the hook body and the torsion spring are sleeved on the pin shaft, and the hook body and the limit block are rotatably connected through the pin shaft. The quick-change structure for a pump head according to claim 6 is characterized in that a limiting groove (3100) is provided on the hook body, the torsion spring is arranged on a side of the hook body adjacent to the limiting groove, the first end (320) of the torsion spring is arranged in the limiting groove, and the second end (321) of the torsion spring abuts against the side wall of the accommodating cavity. The quick-change structure for a pump head according to claim 6, characterized in that the torsion spring is arranged between the bottom wall of the accommodating cavity and the hook body, and the pin shaft sequentially connects the mounting hole, the torsion spring and the hook body from the bottom of the accommodating cavity; or The torsion spring is arranged between the top wall of the accommodating cavity and the hook body, and the pin is sequentially connected to the mounting hole, the hook body and the torsion spring from the bottom of the accommodating cavity. The quick-change structure for a pump head according to any one of claims 6 to 8 is characterized in that the handle extends from an end of the hook body away from the hook portion toward the hook portion, and the handle has a pressure portion extending in a circumferential direction; or, the handle has a pressure portion extending in an axial direction. The quick-change structure for a pump head according to claim 9 is characterized in that an outer edge surface of the pressure-applying portion is provided with an anti-slip portion (3111), and the anti-slip portion is configured as an anti-slip groove or an anti-slip protrusion. The quick-change structure for a pump head according to any one of claims 6 to 10 is characterized in that when the pump head rotates along the screw-in direction until the buckle abuts against the hook, the pump head continues to rotate, and the buckle pushes the hook to drive the torsion spring to rotate back toward the pump head. When the buckle passes over the hook, the torsion spring rebounds and drives the hook to rotate toward the pump head. The quick-change structure for a pump head according to any one of claims 6 to 11 is characterized in that one end of the limit block and the top of the side adjacent to the pump head form a blocking portion (214), and the blocking portion can abut against the hook portion to limit the rotation stroke of the hook toward the pump head. The quick-change structure for a pump head according to claim 4 is characterized in that the buckle has a top surface (220) that cooperates with the groove, a first outer edge surface (221) and a second outer edge surface (222), and along the screw-in direction of the pump head, the top surface is sequentially configured as a plane and a downward-inclined inclined surface, the first outer edge surface and the second outer edge surface are sequentially arranged along the screw-in direction of the pump head, the first outer edge surface is configured as an arc-shaped surface that cooperates with the entry surface, and the second outer edge surface is configured as an inclined surface that is downward-inclined toward the screw-in direction of the pump head to cooperate with the stop surface. The quick-change structure for a pump head according to any one of claims 1 to 13 is characterized in that a rotor chamber (6100) and an impeller chamber (6101) are formed in the shell, the rotor chamber is arranged on one side of the impeller chamber, a liquid outlet (6102) connected to the interior of the impeller chamber is formed on the shell, the opening between two adjacent limit blocks is configured as a placement port for the liquid outlet, the buckle is configured on the outer circumference of the impeller chamber and the bottom of the buckle (22) and the bottom of the impeller chamber (6101) are located on the same plane. The quick-change structure for a pump head according to claim 14 is characterized in that the liquid outlet and one of the clips are arranged in the placement port, the circumferential distance between a side of the clip facing away from the liquid outlet and a side of the liquid outlet facing away from the clip is less than or equal to the circumferential distance of the placement port, and the circumferential distance between a side of the clip facing away from the liquid outlet and a side of the liquid outlet facing the clip is greater than or equal to the circumferential distance of the groove. The quick-change structure for a pump head according to any one of claims 1 to 15 is characterized in that it further includes at least one rubber plug (40), a blind hole is provided on a side of the limit block adjacent to the pump head, the rubber plug is correspondingly arranged in the blind hole, and protrudes in the radial direction to abut against the buckle. The quick-change structure for a pump head according to any one of claims 1 to 16 is characterized in that the number of the limit blocks is 4, the number of the locking unit is 1, and the number of the buckles is 4. A magnetic levitation pump comprises a magnetic levitation motor and a pump head, the magnetic levitation motor comprises a stator, the pump head comprises a housing and a rotor impeller arranged in the housing, a rotor cavity and an impeller cavity are formed in the housing, and the pump head is characterized in that it also comprises a quick-change structure for a pump head according to any one of claims 1 to 17, the pump head is fixed to the magnetic levitation motor through the quick-change structure, and the stator is configured to generate a magnetic field to drive the rotor impeller to rotate and levitate. The magnetic levitation pump according to claim 18 is characterized in that a plurality of bolt holes (50) are provided on the flange at intervals along the circumferential direction, each of the bolt holes is correspondingly arranged at the outer edge of each of the limit blocks, and the flange is fixed to the magnetic levitation motor (62) by passing bolts through the bolt holes. The magnetic levitation pump according to claim 18 or 19 is characterized in that a cavity (620) is provided inside the magnetic levitation motor, and the cavity is configured to accommodate the rotor cavity. When the rotor cavity is placed in the cavity, the outer wall of the rotor cavity abuts against the inner wall of the cavity to limit the pump head in the radial direction.