Magnetic suspension pump with directly cooled pump head

Abstract

The utility model discloses a magnetic suspension pump with a directly cooled pump head, which comprises a magnetic suspension motor and a pump head, the magnetic suspension motor comprises a magnetic suspension stator and a magnetic suspension rotor, the pump head comprises a pump shell and a rotor impeller arranged in the pump shell, and the magnetic suspension rotor is a part of the rotor impeller. The magnetic suspension stator drives the rotor impeller to suspend and rotate stably in a non-contact mode. A liquid cooling cavity is formed in the shell wall of the pump shell, and a liquid inlet and a liquid outlet which communicate with the liquid cooling cavity are formed in the shell wall. The liquid cooling cavity is formed in the shell wall of the pump head of the magnetic suspension pump, the liquid cooling cavity can be communicated with the external circulating cooling device through the liquid inlet and the liquid outlet, so that direct cooling and heat dissipation of the pump head of the magnetic suspension pump are achieved, the liquid cooling cavity and the pump head are integrally formed, and the occupied space of the pump head cannot be additionally increased.

Description

TECHNICAL FIELD

[0001] The utility model relates to the technical field of magnetic suspension, concretely is a kind of magnetic suspension pump of pump head direct cooling. BACKGROUND

[0002] At present, magnetic suspension pump or magnetic suspension bearingless pump is a kind of pump using magnetic suspension technology to realize non-contact driving. It suspends and rotates impeller by electromagnetic force, thereby avoiding the friction and wear problem caused by traditional mechanical bearing. As a disposable low shear pump, magnetic suspension pump has been applied in tangential flow filtration system or alternate tangential flow filtration system, and the magnetic suspension pump comprises a magnetic suspension motor and a pump head. The magnetic suspension motor comprises a magnetic suspension stator and a magnetic suspension rotor. The pump head comprises a pump shell and a rotor impeller arranged in the pump shell. The magnetic suspension rotor is both the rotor of the magnetic suspension motor and part of the rotor impeller of the pump. It can be, for example, a permanent magnet rotor or a short-circuit cage rotor or a magnetoresistive rotor. The magnetic suspension stator is configured to drive the rotor impeller to rotate and suspend. The magnetic suspension motor is preferably a bearingless sheet motor. The bearingless sheet motor is a special bearingless motor that inherits the advantages of bearingless motors. The axial length of the rotor is much smaller than the diameter, and the rotor is in the form of a sheet. The axial magnetic bearing is omitted. The rotation of the rotor and the active suspension in the radial direction are realized by using bearingless technology. The passive suspension of the other three degrees of freedom except the radial direction and the rotation of the rotor is realized by using the magnetic circuit formed by the mechanical structure. The bearingless sheet motor has the characteristics of high cleanliness, no precipitation, no particles, no dynamic seal and superior performance, and has good application prospects in the fields of ultra-clean driving such as biochemistry, medicine and semiconductor manufacturing.

[0003] The pump head of the magnetic suspension pump usually comprises a lower shell and a top cover. The lower shell and the top cover are detachably and fixedly connected in a sealed manner. The center of the top cover forms a pump head inlet pipe. One side of the lower shell forms a pump head outlet pipe. The lower shell and the top cover enclose an impeller cavity of the rotor impeller. The magnetic suspension pump needs to transport high-temperature medium in some application scenarios. For example, in the semiconductor industry, there are applications in which the fluid to be transported is higher than 200℃ (for example, up to 220℃). These fluids are usually chemically aggressive substances, such as sulfuric acid or phosphoric acid. When transporting high-temperature medium, the sealing ring used to realize the sealing between the top cover and the lower shell will accelerate the aging process at high temperature, resulting in a decrease in the sealing performance of the pump head. In addition, the electromagnetic loss generated by the long-time operation of the magnetic suspension rotor will also cause heating, which will cause unnecessary temperature influence on the fluid to be transported. Therefore, how to efficiently reduce the temperature of the pump head of the magnetic suspension pump has become an urgent technical problem to be solved. SUMMARY

[0004] In order to overcome the defects in the prior art, the utility model embodiment provides a kind of magnetic suspension pump of pump head direct cooling, which is used to solve at least one of the above problems.

[0005] According to one aspect of the utility model, provide a kind of magnetic suspension pump of pump head direct cooling, the magnetic suspension pump includes magnetic suspension motor and pump head, the magnetic suspension motor includes magnetic suspension stator and magnetic suspension rotor, the pump head includes pump shell and the rotor impeller of being arranged in the pump shell, the magnetic suspension rotor is part of the rotor impeller, the magnetic suspension stator drives the rotor impeller stable suspension and rotation in non-contact mode;Its characterized in that, shell wall of the pump shell is formed with liquid cooling cavity, inlet and outlet of the liquid cooling cavity are formed on the shell wall.

[0006] Further, the shell wall includes a side wall, a top wall, and a bottom wall. The liquid cooling cavity is formed in the side wall and / or the top wall and / or the bottom wall.

[0007] Further, the side wall and the bottom wall are integrally formed as a lower shell. The lower shell is sealingly and fixedly connected with the top wall. Alternatively, the side wall and the top wall are integrally formed as an upper shell. The upper shell is sealingly and fixedly connected with the bottom wall.

[0008] Further, the lower shell further includes a pressing plate. The liquid cooling cavity is formed in the side wall of the lower shell. An opening of the liquid cooling cavity towards the bottom wall is sealingly and fixedly closed by the pressing plate.

[0009] Further, a first groove is formed on the inner side of one end of the side wall of the lower shell towards the upper shell. A first sealing ring is arranged in the first groove.

[0010] Further, a second groove is arranged at the opening of one end of the liquid cooling cavity towards the pressing plate. A second sealing ring is arranged in the second groove.

[0011] Further, the liquid cooling cavity is annular and surrounds the rotor impeller.

[0012] Further, a pump head inlet pipe is formed at the center of the top wall. A pump head outlet pipe is formed on one side of the side wall. An outlet step of the liquid cooling cavity is formed close to the pump head outlet pipe.

[0013] Further, the liquid cooling cavity includes a plurality of C-shaped flow channels arranged along the axial direction. Adjacent two C-shaped flow channels are connected by a transition flow channel.

[0014] Further, a rotor joint portion is formed at the center of the bottom wall. One end of the magnetic suspension stator is formed with a stator joint portion adapted to the rotor joint portion.

[0015] Further, a protruding portion is formed at the center of the bottom wall and protrudes towards the magnetic suspension stator. One end of the magnetic suspension stator is formed with a recessed cavity adapted to the protruding portion. The protruding portion is configured as the rotor joint portion. The recessed cavity is configured as the stator joint portion.

[0016] The utility model discloses a beneficial effect as follows:

[0017] The utility model provides a pump head direct cooling's magnetic suspension pump, and the magnetic suspension pump includes magnetic suspension motor and pump head, and the magnetic suspension motor includes magnetic suspension stator and magnetic suspension rotor, and the pump head includes the rotor impeller of pump shell and being arranged in the pump shell, and the magnetic suspension rotor is the part of rotor impeller, and the magnetic suspension stator drives rotor impeller stable suspension and rotation in the mode of no contact, it is characterized in that, the shell wall of pump shell forms liquid cooling cavity, and the shell wall forms the liquid inlet and liquid outlet of the intercommunication liquid cooling cavity.

[0018] In order to let above and other purposes, characteristics and advantages of the utility model more obvious easy to understand, below the preferred embodiment is held, and cooperation the drawing is as follows with the detailed description of the following. BRIEF DESCRIPTION OF DRAWINGS

[0019] In order to more clearly illustrate the utility model embodiment or prior art technical scheme, the following will be needed to use the drawing in the embodiment or prior art description briefly introduces, obviously, the drawing in the following description only some embodiments of the utility model, for those skilled in the art, under the premise of not paying the creative labor, can also obtain other drawings according to these drawings.

[0020] Figure 1 It is the structure schematic of a embodiment of the utility model pump head direct cooling's magnetic suspension pump Figure 1 ;

[0021] Figure 2 It is the structure schematic of a embodiment of the utility model pump head direct cooling's magnetic suspension pump Figure 2 ;

[0022] Figure 3 It is the sectional view of A-A direction in Figure 2 ;

[0023] Figure 4 It is the structure schematic of a embodiment of the utility model pump head Figure 1 ;

[0024] Figure 5 It is the structure schematic of a embodiment of the utility model pump head Figure 2 ;

[0025] Figure 6 It is the sectional view of B-B direction in Figure 5 ;

[0026] Figure 7 is a structural schematic of one embodiment of the pump head (without the pressing plate) in the utility model Figure 3 ;

[0027] Figure 8 is a structural schematic of another embodiment of the pump head in the utility model Figure 1 ;

[0028] Figure 9 is a structural schematic of another embodiment of the pump head (without the pressing plate) in the utility model Figure 2 ;

[0029] Figure 10 is a structural schematic of still another embodiment of the pump head in the utility model. DETAILED DESCRIPTION

[0030] The technical solutions in the embodiments of the utility model will be clearly and completely described below with reference to the drawings in the embodiments of the utility model. Obviously, the described embodiments are only part of the embodiments of the utility model, rather than all the embodiments. Based on the embodiments of the utility model, all other embodiments obtained by those skilled in the art without creative labor fall within the scope of protection of the utility model.

[0031] In the description of the utility model, it should be noted that the terms "upper", "lower", "inner", "outer" and the like indicate the orientation or positional relationship described based on the drawings, and are only for the convenience of describing the utility model and simplifying the description, and do not indicate or imply that the devices or elements indicated must have a particular orientation, be constructed and operated in a particular orientation, and therefore cannot be understood as a limitation on the utility model. The terms "include" and "have" in the specification and claims of the utility model and the above drawings are intended to cover non-exclusive inclusion, for example, a system, product or device including a series of units does not have to be limited to those units clearly listed, but can include other units not clearly listed or inherent to these products or devices.

[0032] In addition, the terms "first", "second" are only for the purpose of description, and cannot be understood as indicating or implying relative importance or implicitly indicating the number of the indicated technical features. Therefore, the features defined with "first", "second" can explicitly or implicitly include one or more of the features. In the description of the utility model, unless otherwise specified, the meaning of "a plurality of" is two or more, unless otherwise explicitly limited.

[0033] The drawings in the disclosure are not strictly drawn according to the actual proportion, and the specific size and quantity of each structure can be determined according to the actual need. The drawings described in the disclosure are only schematic drawings.

[0034] Figure 1 is a structure diagram of a pump head directly cooled magnetic suspension pump according to the present application Figure 1 . Figure 2 is a structure diagram of a pump head directly cooled magnetic suspension pump according to the present application Figure 2 . Figure 3 is Figure 2 a sectional view along A-A direction in the present application. Figure 4 is a structure diagram of a pump head according to the present application Figure 1 . Figure 5 is a structure diagram of a pump head according to the present application Figure 2 . Figure 6 is Figure 5 a sectional view along B-B direction in the present application. Figure 7 is a structure diagram of a pump head (without pressing plate) according to the present application Figure 3 . Figure 8 is a structure diagram of a pump head according to the present application Figure 1 . Figure 9 is a structure diagram of a pump head (without pressing plate) according to the present application Figure 2 . Figure 10 is a structure diagram of a pump head according to the present application.

[0035] According to the present application, referring to Figure 1 , Figure 2 and Figure 3 , a pump head directly cooled magnetic suspension pump is provided, which comprises a magnetic suspension motor 1 and a pump head 2, the magnetic suspension motor 1 comprises a magnetic suspension stator 11 and a magnetic suspension rotor 12, the pump head 2 comprises a pump shell 21 and a rotor impeller 22 arranged in the pump shell 21, the magnetic suspension rotor 12 is a part of the rotor impeller 22, and the magnetic suspension stator 11 drives the rotor impeller 22 to stably suspend and rotate in a non-contact manner; a liquid cooling cavity 23 is formed in a shell wall of the pump shell 21, and an inlet 231 and an outlet 232 of the liquid cooling cavity are formed on the shell wall.

[0036] The rotor impeller 22 generally comprises a rotor body 221 and a plurality of blades 222 formed on the rotor body 221, the magnetic suspension rotor 12 is configured as part of the rotor body 221, and the magnetic suspension stator 11 drives the magnetic suspension rotor 12 to suspend and rotate based on the principle of a bearingless sheet motor, that is, the magnetic suspension stator 11 drives the rotor body 221 to suspend and rotate, and the rotor body 221 in turn drives the blades 222 to rotate and suspend, so as to realize the function that the magnetic suspension stator 11 drives the rotor impeller 22 to suspend and rotate in a non-contact manner.

[0037] The rotor impeller can be semi-closed or closed. For a semi-closed impeller, the impeller is composed of the rotor body 221 and the plurality of blades 222, and the plurality of blades are arranged on one side end face of the rotor body 221. For a closed impeller, referring to Figure 6 , the rotor impeller 22 is composed of the cover plate 223, the rotor body 221 and the plurality of blades 222, and the plurality of blades 222 are arranged between one side end face of the rotor body 221 and the cover plate 223.

[0038] According to the embodiment of the present disclosure, referring to Figure 3 , the shell wall comprises a side wall 211, a top wall 212 and a bottom wall 213, and the liquid cooling cavity 23 is formed in the side wall and / or the top wall and / or the bottom wall. The position of the impeller cavity in the shell wall is not limited in the present application, that is, the liquid cooling cavity can be formed in at least one position of the side wall, the top wall and the bottom wall. For example, according to the material of the shell wall of the pump head, a more favorable position of the liquid cooling cavity can be selected. For example, when the pump head is made of high corrosion-resistant materials such as polytetrafluoroethylene (PTFE), the thermal conductivity of PTFE is relatively long, so the liquid cooling cavity can be arranged at a position closer to the inner wall of the shell wall, for example, the liquid cooling cavity is arranged at a position adjacent to the bottom wall and the side wall, so as to be closer to the position of the volute of the pump head. For another example, when the pump head is made of stainless steel and other materials with good thermal conductivity, the liquid cooling cavity can be arranged at a middle position of the shell wall, etc.

[0039] According to the embodiment of the present disclosure, referring to Figure 3 and Figure 6 , the side wall 211 and the bottom wall 214 are integrally formed as a lower shell, and the lower shell is sealingly and fixedly connected with the top wall. The top wall is also called a top plate or an upper shell. The top wall generally comprises a plate body and a convex portion protruding towards the volute in the middle, that is, a step is formed at the junction of the convex portion and the plate body, the side wall of the lower shell is flush with the outer side of the plate body, and the outer side of the convex portion of the top wall is in contact with the inner side of the side wall of the lower shell. Referring to Figure 6, preferably, the side wall of the lower shell is formed with a first groove 24 at the inner side of the end of the side wall towards the top wall, and the first groove 24 is provided with a first sealing ring 25. In this way, when the top wall and the side wall of the lower shell are locked together by fasteners, the first sealing ring can realize the sealing and fixed connection between the top wall and the lower shell. In other embodiments, the side wall can also be integrally formed with the top wall as the upper shell, and based on the same principle, the upper shell and the bottom wall can also be sealingly and fixedly connected by setting a sealing ring and through fasteners.

[0040] According to the embodiments of the present disclosure, referring to Figure 5 , Figure 6 , Figure 7 , Figure 8 and Figure 9 , the lower shell further comprises a pressing plate 214, and the liquid cooling cavity 23 is formed in the side wall of the lower shell and the opening of the liquid cooling cavity towards the bottom wall is sealingly and fixedly sealed by the pressing plate. In this way, the cavity (liquid cooling cavity) can be first machined or injection molded on the shell wall of the pump head, and then the pressing plate is covered on the opening of the liquid cooling cavity towards the bottom wall for fixed sealing. The sealing and fixed connection between the pressing plate and the side wall or the bottom wall can be realized by fasteners or adhesion or welding. In an embodiment, referring to Figure 5 , the pressing plate is locked on the bottom wall and the side wall of the shell wall by a plurality of fasteners. In another embodiment, referring to Figure 8 , when the pump head is made of metal materials such as stainless steel, the sealing and fixed connection can be realized by welding. Since the pump head is made of metal materials such as stainless steel and is welded, there is no need to set a sealing ring, so the size of the liquid cooling cavity can be designed larger to provide cooling effect.

[0041] When the pump head is made of materials such as PTFE, the sealing can also be realized by setting a sealing ring. Preferably, referring to Figure 6 and Figure 7 , the liquid cooling cavity 23 is provided with a second groove 26 at the opening of the end of the liquid cooling cavity 23 towards the pressing plate 214, and the second groove 26 is provided with a second sealing ring 27. In this way, when the pressing plate and the side wall and the bottom wall of the lower shell are locked together by fasteners, the second sealing ring can realize the sealing and fixed connection between the pressing plate and the lower shell. In other embodiments, the liquid cooling cavity can also be directly formed as a flow channel surrounding the volute chamber in the shell wall of the pump head.

[0042] According to the embodiments of the present disclosure, referring to Figure 6 , Figure 7 and Figure 9 , the liquid cooling cavity 23 is annular and surrounds the rotor impeller. That is, the liquid cooling cavity surrounds the periphery of the volute chamber of the pump head, so that the fluid to be transported in the volute chamber can be directly cooled and heat-dissipated.

[0043] According to the embodiments of the present disclosure, referring to Figure 10The liquid cooling cavity 23 comprises a plurality of C-shaped flow channels 233 arranged in the axial direction, and adjacent two C-shaped flow channels 233 are communicated through a transition flow channel 234. In this way, the plurality of C-shaped flow channels are arranged in the axial direction, and the cooling liquid enters one C-shaped flow channel from the liquid inlet, and then enters the next C-shaped flow channel through the filter flow channel. Since the C-shaped flow channel surrounds the volute of the pump head, the pump head part of the magnetic suspension pump can be directly cooled and radiated. The opening of the C-shaped flow channel is used to avoid the pump head outlet pipe on the side wall of the lower shell. In this way, the liquid inlet and the liquid outlet on the pump head can be arranged at the same side. See Figure 10 , the structure of two C-shaped flow channels is shown. Two C-shaped flow channels are communicated through a transition flow channel. In other embodiments, the liquid cooling cavity can also be arranged in other regular or irregular shapes.

[0044] According to the embodiments of the present disclosure, referring to Figure 6 , Figure 7 and Figure 9 , the pump head inlet pipe 2121 is formed at the center of the top wall 212 of the pump head, the pump head outlet pipe 2111 is formed on one side of the side wall 211, and the liquid cooling cavity 23 forms an outlet step 2112 near the pump head outlet pipe 2121. Since the pump head outlet pipe 2121 of the pump head is arranged on the side wall, and the annular liquid cooling cavity needs to be avoided when passing through the pump head outlet pipe, the flow area of the liquid cooling cavity can be increased as much as possible while the design of the pump head outlet pipe is not affected. The pump head inlet pipe 2121 and the pump head outlet pipe 2111 are used to connect the external pipeline to realize the circulating pumping of the pumping system. For example, the pump head inlet pipe 2121 and the pump head outlet pipe 2111 are tubular interfaces, which can have threads to connect the external pipeline, but are not limited thereto, and can also be other connection modes.

[0045] According to the embodiments of the present disclosure, referring to Figure 3 , Figure 6 , Figure 8 and Figure 9 , the rotor joint part 215 is formed at the center of the bottom wall 213 of the pump head, and one end of the magnetic suspension stator 11 forms a stator joint part 111 matched with the rotor joint part 215. In this way, the magnetic suspension rotor 12 is limited by the rotor joint part 215 when arranged in the pump head. And through the cooperation of the rotor joint part and the stator joint part, the configuration of the magnetic suspension motor of the inner rotor or the outer rotor can be realized. For example, referring to Figure 3, the magnetic suspension motor is an inner rotor, a protruding part protruding towards the magnetic suspension stator is formed at the center of the bottom wall of the pump head, one end of the magnetic suspension stator is formed with a recess cavity matched with the protruding part, the protruding part is configured as a rotor joint part, and the recess cavity is configured as a stator joint part. In this way, the rotor body 221 of the rotor impeller 22 is accommodated in the space of the rotor joint part. The magnetic suspension stator has the recess cavity, and the protruding part of the pump head protrudes into the recess cavity, thereby forming the inner rotor type magnetic suspension motor. However, the magnetic suspension motor is not limited to this, and in other embodiments, the magnetic suspension motor can also be an outer rotor. At this time, the rotor joint part is configured as a hollow protruding column part of the bottom wall of the pump head, the rotor body can be in the form of a circular ring and is sleeved on the protruding column part, and the magnetic suspension stator is arranged in the hollow part of the protruding column part, thereby forming the outer rotor type magnetic suspension motor.

[0046] Referring to Figure 6 , according to the embodiment of the present disclosure, the magnetic suspension rotor is configured as a permanent magnet type rotor, and one magnetic pole pair of the permanent magnet type rotor generates a magnetic field according to a cosine distribution. However, the permanent magnet type rotor is not limited to one magnetic pole pair with N poles and S poles in radial magnetization, and the permanent magnet type rotor can also include M magnetic pole pairs, where M is a non-zero natural number. When M is an odd number, each magnetic pole pair includes two magnetic poles with opposite polarities, and the two magnetic poles are arranged in the radial direction. When M is an even number, each magnetic pole pair includes two magnetic poles with the same polarity, and the two magnetic poles are arranged in the radial direction. For example, when M is equal to 1, the permanent magnet type rotor includes one magnetic pole pair, and the magnetic pole pair includes two magnetic poles with opposite polarities, i.e., N poles and S poles.

[0047] Referring to Figure 1 and Figure 2 , the magnetic suspension motor usually further includes a shell and a filling material filled between the magnetic suspension stator 11 and the shell, and the filling material includes but is not limited to epoxy resin, silicone, polyurethane, etc.

[0048] The bearingless sheet motor is a special bearingless motor which inherits the advantages of the bearingless motor and has a very small axial length-diameter ratio of the rotor, i.e., the rotor is in the form of a sheet, and the axial magnetic bearing is omitted. The rotation of the rotor and the active suspension in the radial direction are realized by using the bearingless technology, and the passive suspension of the other three degrees of freedom except the radial direction and the rotation of the rotor is realized by using the magnetic circuit formed by the mechanical structure, so that the bearingless sheet motor has the characteristics of high cleanliness, no precipitation, no particles, no dynamic seal and superior performance, and has a good application prospect in the field of ultraclean driving such as biochemistry, medical treatment and semiconductor manufacturing.

[0049] The bearingless sheet motor can be divided into a single winding structure and a double winding structure according to different winding structures, and the winding structure of the bearingless sheet motor is not limited in the utility model, and can be a single winding structure or a double winding structure. According to the embodiment of the present disclosure, referring to Figure 3The magnetic suspension stator 11 comprises a plurality of stator teeth 111 and a plurality of control windings 112, the stator teeth 111 are L-shaped, the stator assembly further comprises a magnetic conducting ring 113, the longitudinal arms of the plurality of stator teeth 111 are magnetically connected with the magnetic conducting ring 113, the control windings 112 are sleeved on the longitudinal arms of the stator teeth 111, and the transverse arms (stator magnetic poles) of the plurality of stator teeth 111 enclose a recess. In an embodiment, two winding coils are arranged on each stator tooth, and the two winding coils can be both concentrated windings, or one winding coil is a concentrated winding and the other winding coil is a distributed winding. The two winding coils on the stator tooth are stacked together, one winding coil is used for rotation control, and the other winding coil is used for suspension control, so as to form a double-winding structure of the magnetic suspension motor. In another embodiment, one winding coil is arranged on each stator tooth, and the winding coil is a concentrated winding, which is used for both rotation control and suspension control, so as to form a single-winding structure of the magnetic suspension motor. Figure 3 In the embodiment, only one control winding is shown.

[0050] According to the embodiment of the present disclosure, the magnetic suspension motor is not limited to the structure of the magnetic suspension stator, for example, the magnetic suspension stator can be a one-word stator tooth magnetic suspension stator structure formed by connecting the outer ends of a plurality of one-word stator teeth through a magnetic conducting ring (stator yoke), or an L-shaped stator tooth magnetic suspension stator structure formed by connecting the longitudinal parts of a plurality of L-shaped stator teeth through a magnetic conducting ring. The mounting structure of the magnetic suspension stator in the casing is not limited in the embodiment.

[0051] According to the embodiment of the present disclosure, the magnetic suspension pump can be configured as a magnetic suspension centrifugal pump, wherein the pump head and the rotor impeller arranged therein can be separated from the casing of the magnetic suspension motor in a relatively easy manner. The pump casing and the impeller can thus be designed as, for example, single-use parts. Due to the extremely high purity requirements, such single-use applications often replace today's processes in which all those components that come into contact with the fluid to be treated have to be cleaned and disinfected in a complex manner (for example by steam sterilization) in previous processes. In the single-use design, those components that come into contact with the fluid to be treated are used only once and are then replaced by new (i.e. unused) single-use parts in the next application.

[0052] The principle and implementation manner of the utility model are described in the specific embodiments in the utility model, and the above embodiment is only used to help understand the technical scheme and core idea of the utility model; meanwhile, for the general technical personnel in the field, the specific implementation manner and application range will be changed according to the idea of the utility model, and in conclusion, the content of the specification should not be understood as the limitation of the utility model.

Claims

1. A magnetic levitation pump directly cooled by a pump head, comprising a magnetic levitation motor (1) and a pump head (2), the magnetic levitation motor comprising a magnetic levitation stator (11) and a magnetic levitation rotor (12), the pump head comprising a pump shell (21) and a rotor impeller (22) arranged in the pump shell, the magnetic levitation rotor being a part of the rotor impeller, the magnetic levitation stator driving the rotor impeller to stably levitate and rotate in a contactless manner; characterized in that, A liquid cooling cavity (23) is formed in the shell wall of the pump housing, and a liquid inlet (231) and a liquid outlet (232) are formed in the shell wall and communicate with the liquid cooling cavity.

2. The magnetically levitated pump directly cooled at the pump head according to claim 1, characterized in that The shell wall comprises a side wall (211), a top wall (212) and a bottom wall (213), and the liquid cooling cavity is formed in the side wall and / or the top wall and / or the bottom wall.

3. The magnetically levitated pump with direct cooling of the pump head according to claim 2, characterized in that The side wall and the bottom wall are integrally formed as a lower housing, and the lower housing is sealingly and fixedly connected with the top wall; or the side wall and the top wall are integrally formed as an upper housing, and the upper housing is sealingly and fixedly connected with the bottom wall.

4. The magnetically levitated pump directly cooled at the pump head according to claim 3, characterized in that The lower housing further comprises a pressing plate (214), and the liquid cooling cavity is formed in the side wall of the lower housing and the opening of the liquid cooling cavity towards the bottom wall is sealed and fixed by the pressing plate.

5. The magnetically levitated pump directly cooled at the pump head according to claim 3, characterized in that A first groove (24) is formed in the inner side of the end of the side wall of the lower housing towards the upper housing, and a first sealing ring (25) is arranged in the first groove.

6. A magnetically levitated pump according to claim 4, wherein A second groove (26) is arranged in the opening of the end of the liquid cooling cavity towards the pressing plate, and a second sealing ring (27) is arranged in the second groove.

7. A magnetically levitated pump according to any of claims 2-6, characterized in that The liquid cooling cavity is annular and surrounds the rotor impeller.

8. A magnetically levitated pump according to claim 7, wherein A pump head inlet pipe (2121) is formed in the center of the top wall, a pump head outlet pipe (2111) is formed in one side of the side wall, and an outlet step (2112) is formed in the liquid cooling cavity close to the pump head outlet pipe.

9. A magnetically levitated pump according to any of claims 1-6, characterized in that The liquid cooling cavity comprises a plurality of C-shaped flow channels (233) arranged in the axial direction, and two adjacent C-shaped flow channels are connected by a transition flow channel (234).

10. A magnetically levitated pump according to any one of claims 2-6, characterized in that A rotor joint (215) is formed in the center of the bottom wall, and one end of the magnetic suspension stator is formed with a stator joint (111) matched with the rotor joint.

11. A magnetically levitated pump according to claim 10, wherein A protrusion is formed in the center of the bottom wall and protrudes towards the magnetic suspension stator, one end of the magnetic suspension stator is formed with a recess matched with the protrusion, the protrusion is configured as the rotor joint, and the recess is configured as the stator joint.

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