CN217381017U

CN217381017U - Centrifugal pump and pump head structure thereof

Info

Publication number: CN217381017U
Application number: CN202220974482.0U
Authority: CN
Inventors: 崔庆文; 其他发明人请求不公开姓名
Original assignee: Gentai Medical Technology Shenzhen Co ltd
Current assignee: Shenzhen Chuangke Medical Technology Co ltd
Priority date: 2022-04-21
Filing date: 2022-04-21
Publication date: 2022-09-06
Anticipated expiration: 2032-04-21

Abstract

The utility model discloses a centrifugal pump and pump head structure thereof, the pump head structure includes pump case, pump cover and impeller subassembly, the pump case includes the shell main part and integrated into one piece in the liquid outlet nozzle of shell main part lateral part, the shell main part is equipped with the holding chamber, the liquid outlet nozzle be equipped with the drain channel that the holding chamber communicates, the shell main part is equipped with along the first sealed face of the circumference extension of holding chamber, the liquid outlet nozzle is equipped with along the second sealed face of the circumference extension of drain channel entrance side, first sealed face and the second sealed face connect and form a continuous annular sealed face; the pump cover is sealed and sealed on the annular sealing surface, an impeller chamber is formed between the pump cover and the accommodating cavity, and the pump cover is provided with a liquid inlet channel communicated with the impeller chamber; the impeller assembly is rotatably mounted in the impeller chamber, and a plurality of blades are arranged on one side, facing the pump cover, of the impeller assembly. The utility model discloses technical scheme can reduce the weeping risk.

Description

Centrifugal pump and pump head structure thereof

Technical Field

The utility model relates to a pump technical field, in particular to centrifugal pump and pump head structure thereof.

Background

The pump is a common device for conveying fluid, and is widely applied to the fields of industrial production and medical instruments, such as blood pumps, wherein a pump head structure outer shell is generally formed by splicing two half shells, however, in the current assembly structure, a sealing surface of the half shell or a liquid outlet channel through wall usually has seams, the sealing difficulty of the seams is high, and a great leakage risk exists in the use process.

SUMMERY OF THE UTILITY MODEL

The utility model mainly aims at providing a pump head structure aims at reducing the weeping risk.

In order to achieve the above object, the utility model provides a pump head structure, include:

the pump shell comprises a shell main body and a liquid outlet nozzle integrally formed on the side part of the shell main body, the shell main body is provided with an accommodating cavity, the liquid outlet nozzle is provided with a liquid outlet channel communicated with the accommodating cavity, the shell main body is provided with a first sealing surface extending along the circumferential direction of the accommodating cavity, the liquid outlet nozzle is provided with a second sealing surface extending along the circumferential direction of the inlet side of the liquid outlet channel, and the first sealing surface and the second sealing surface are connected to form a continuous annular sealing surface;

the pump cover is sealed and closed on the annular sealing surface, an impeller chamber is formed between the pump cover and the accommodating cavity, and the pump cover is provided with a liquid inlet channel communicated with the impeller chamber; and

and the impeller assembly is rotatably arranged in the impeller chamber, and a plurality of blades are arranged on one side of the impeller assembly, which faces the pump cover.

Optionally, the second sealing surface includes a first plane and two second planes, the first plane is disposed obliquely with respect to the extending direction of the liquid outlet channel, the two second planes are disposed on two opposite sides of the liquid outlet channel and extend along the extending direction of the liquid outlet channel, the second planes are connected between the first sealing surface and the first plane, and the first plane and the second plane are connected smoothly.

Optionally, the outside of liquid outlet nozzle and in first plane department is equipped with strengthens the protruding muscle, strengthen the protruding muscle edge the circumference of liquid outlet nozzle extends, first plane extends to strengthen the protruding muscle.

Optionally, the liquid outlet channel includes a complete hole section and a split groove section located between the first plane and the two second planes, the pump cover is provided with an arc-shaped groove corresponding to the split groove section, and the arc-shaped groove and the split groove section are split to form a complete flow passage connected with the complete hole section.

Optionally, the pump cover is detachably connected with the pump shell.

Optionally, the accommodating cavity is a rotary cavity structure, and the liquid outlet channel extends along a tangential direction of the accommodating cavity.

Optionally, the pump cover is provided with a continuous annular matching surface, the annular matching surface is in sealing fit with the annular sealing surface, at least one of the annular matching surface and the annular sealing surface is provided with a sealing groove, the sealing groove is in a closed ring shape extending along the circumferential direction of the annular sealing surface, the pump head structure further comprises a sealing ring, and the sealing ring is installed in the sealing groove and abutted between the pump shell and the pump cover.

Optionally, a ratio of a groove depth of the sealing groove to a thickness of the sealing ring is not less than 0.7 and not more than 0.85.

Optionally, an outer peripheral portion of the annular sealing surface is provided with a plurality of first studs, the pump cover is provided with a second stud corresponding to each first stud, the pump head structure further includes a fastening bolt and a nut, and the fastening bolt is inserted through the first studs and the second studs and is screwed with the nut.

Optionally, the pump case is provided with at least two first positioning portions, the pump cover is provided with at least two second positioning portions, and each first positioning portion and each second positioning portion are in one-to-one corresponding insertion fit.

Optionally, the impeller assembly includes an impeller, a rotor housing, and a first magnetic suspension module, the impeller is provided with the blades on one side facing the pump housing, the rotor housing and one side of the impeller facing away from the pump cover enclose to form an installation cavity, the first magnetic suspension module is installed in the installation cavity, and the first magnetic suspension module is used for cooperating with a second magnetic suspension module in a stator assembly of the centrifugal pump, so that the impeller assembly is suspended in the impeller chamber.

The utility model also provides a centrifugal pump, including the stator assembly and as above-mentioned pump head structure, pump head structure install in the stator assembly.

Optionally, the impeller assembly of the pump head structure is provided with a first magnetic suspension module, the stator assembly comprises a stator housing and a second magnetic suspension module arranged in the stator housing, the stator housing is provided with a socket and an accommodating space communicated with the socket, and a pump shell of the pump head structure is mounted in the accommodating space in a pluggable manner; the first magnetic suspension module is matched with the second magnetic suspension module so that the impeller assembly is suspended in an impeller chamber of the pump head structure.

The utility model discloses technical scheme is equipped with the first sealed face that extends along the circumference in holding chamber through being equipped with in the shell main part, and the drain nozzle is equipped with the sealed face of second that extends along the circumference of drain passage inlet side, makes the sealed face of first sealed face and second connect and forms a continuous ring seal face. Therefore, the annular sealing surface forms a complete sealing surface structure, the condition of seams on the annular sealing surface is avoided, the sealing performance between the pump cover and the pump shell can be improved, and the risk of leakage of the pump head structure is reduced. When the second sealing surface is arranged on the inlet side of the liquid outlet channel, the part, which is located on the outlet side of the liquid outlet channel, of the liquid outlet nozzle is of a complete tubular structure, the condition that a splicing seam exists at the connecting pipe of the liquid outlet nozzle is avoided, when the pipeline is connected onto the liquid outlet nozzle, the connection sealing performance is good, and the risk of liquid leakage of the pump head structure in use is reduced.

Drawings

In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings needed to be used in the description of the embodiments or the prior art will be briefly described below, it is obvious that the drawings in the following description are only some embodiments of the present invention, and for those skilled in the art, other drawings can be obtained according to the structures shown in the drawings without creative efforts.

Fig. 1 is a schematic structural diagram of an embodiment of a pump head structure of the present invention;

FIG. 2 is an exploded view of the pump head construction of FIG. 1;

FIG. 3 is a schematic structural view of the pump casing of FIG. 2;

FIG. 4 is a schematic diagram of the pump cap of FIG. 2;

FIG. 5 is a cross-sectional view of one embodiment of the centrifugal pump of the present invention;

FIG. 6 is a schematic structural diagram of the second suspension module shown in FIG. 5;

FIG. 7 is a top view of the second suspension module of FIG. 6;

fig. 8 is a sectional view of the second levitation module of fig. 6.

The reference numbers illustrate:

100. a pump head structure; 10. a pump housing; 101. an annular sealing surface; 11. a housing main body; 111. an accommodating cavity; 112. a first sealing surface; 12. a liquid outlet nozzle; 121. a liquid outlet channel; 122. splicing the groove sections; 123. a second sealing surface; 124. a first plane; 125. a second plane; 126. reinforcing the convex ribs; 127. a first stud; 128. a first positioning portion; 20. a pump cover; 21. a liquid inlet channel; 22. an arc-shaped groove; 23. sealing the groove; 24. a second stud; 25. a second positioning portion; 26. an annular mating surface; 31. a seal ring; 32. fastening a bolt; 33. a nut; 40. an impeller assembly; 41. an impeller; 42. a rotor housing; 431. a first permanent magnet ring; 432. a first core ring; 433. a second core ring; 434. a second permanent magnet ring; 435. a fan-shaped permanent magnet tile; 436. a fan-shaped baffle block; 438. a baffle ring; 500. a stator assembly; 50. a stator housing; 620. a stator core ring; 630. a displacement sensor; 640. a winding coil; 641. a stator core; 642. a suspension coil; 643. a drive coil; 650. fixing the disc; 660. a magnetically conductive disc; 670. and (7) installing a ring.

The objects, features and advantages of the present invention will be further described with reference to the accompanying drawings.

Detailed Description

The technical solutions in the embodiments of the present invention will be described clearly and completely with reference to the accompanying drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only some embodiments of the present invention, not all embodiments. Based on the embodiments in the present invention, all other embodiments obtained by a person skilled in the art without creative efforts belong to the protection scope of the present invention.

It should be noted that, if directional indications (such as upper, lower, left, right, front and rear … …) are involved in the embodiment of the present invention, the directional indications are only used to explain the relative position relationship between the components, the motion situation, etc. in a specific posture (as shown in the drawings), and if the specific posture is changed, the directional indications are changed accordingly.

In addition, if there is a description relating to "first", "second", etc. in the embodiments of the present invention, the description of "first", "second", etc. is for descriptive purposes only and is not to be construed as indicating or implying relative importance or implicitly indicating the number of technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include at least one such feature. In addition, the meaning of "and/or" appearing throughout is to include three juxtapositions, exemplified by "A and/or B," including either the A or B arrangement, or both A and B satisfied arrangement. In addition, the technical solutions in the embodiments may be combined with each other, but it must be based on the realization of those skilled in the art, and when the technical solutions are contradictory or cannot be realized, the combination of the technical solutions should not be considered to exist, and is not within the protection scope of the present invention.

The utility model provides a pump head structure for the centrifugal pump, for example can be used for centrifugal blood pump, perhaps is used for the centrifugal pump of other usage.

In the embodiment of the present invention, please refer to fig. 1 to 4, the pump head structure 100 includes a pump case 10, a pump cover 20 and an impeller assembly 40, the pump case 10 includes a case main body 11 and a liquid outlet 12 integrally formed at a side portion of the case main body 11, the case main body 11 is provided with an accommodating chamber 111, the liquid outlet 12 is provided with a liquid outlet channel 121 communicated with the accommodating chamber 111, the case main body 11 is provided with a first sealing surface 112 extending along a circumferential direction of the accommodating chamber 111, the liquid outlet 12 is provided with a second sealing surface 123 extending along a circumferential direction of an inlet side of the liquid outlet channel 121, and the first sealing surface 112 and the second sealing surface 123 are connected to form a continuous annular sealing surface 101; the pump cover 20 is hermetically covered on the annular sealing surface 101, an impeller chamber is formed between the pump cover 20 and the accommodating cavity 111, and the pump cover 20 is provided with a liquid inlet channel 21 communicated with the impeller chamber; the impeller assembly 40 is rotatably mounted to the impeller chamber, and a plurality of blades are provided on a side of the impeller assembly 40 facing the pump cover 20.

It should be noted that, the continuous annular sealing surface 101 means that the first sealing surface 112 and the second sealing surface 123 are connected end to form a closed ring surface, and here, it is not limited to the case that the annular sealing surface 101 is only a circular ring, and the shape of the annular sealing surface 101 may be an irregular annular structure or other regular annular structures, which is not limited by the present invention.

The inlet side of the liquid outlet channel 121, i.e. the side where the liquid outlet channel 121 is connected to the accommodating cavity 111, is opposite to the outlet side of the liquid outlet channel 121, and the outlet side of the liquid outlet channel 121 is located at the outer end of the liquid outlet nozzle 12. In use, fluid enters the impeller chamber from the inlet channel 21 on the pump cover 20, and under the action of the impeller assembly 40, the fluid entering the impeller chamber can be driven to flow from the inlet side to the outlet side of the outlet channel 121 and finally flows out from a pipeline connected to the outlet side of the outlet channel 121.

The utility model discloses technical scheme is through being equipped with the first sealed face 112 that extends along the circumference of holding chamber 111 in shell main part 11, and liquid outlet 12 is equipped with the sealed face 123 of second that extends along the circumference of liquid outlet channel 121 entrance side, makes the sealed face 123 of first sealed face 112 and second connect and form a continuous ring seal face 101. Therefore, the annular sealing surface 101 forms a complete sealing surface structure, the condition that a seam exists on the annular sealing surface 101 is avoided, the sealing performance between the pump cover 20 and the pump shell 10 can be improved, and the leakage risk of the pump head structure 100 is reduced. And when the second sealing surface 123 is arranged on the inlet side of the liquid outlet channel 121, the part of the liquid outlet nozzle 12 on the outlet side of the liquid outlet channel 121 is equivalent to a complete tubular structure, so that the condition that a splicing seam exists at the connecting pipe of the liquid outlet nozzle 12 is avoided, when a pipeline is connected onto the liquid outlet nozzle 12, the connection sealing performance is good, and the risk of liquid leakage of the pump head structure 100 in use is reduced.

In some embodiments, the second sealing surface 123 comprises a first plane 124 and two second planes 125, the first plane 124 is arranged obliquely with respect to the extension direction of the outlet channel 121, the two second planes 125 are arranged on opposite sides of the outlet channel 121 and extend in the extension direction of the outlet channel 121, the second plane 125 is connected between the first sealing surface 112 and the first plane 124, and the first plane 124 and the second plane 125 are connected smoothly. For convenience of illustration, a virtual reference line is defined, which is parallel to the second plane 125 and perpendicular to the axis of the liquid outlet channel 121.

Specifically, the second plane 125 is located on the same plane as the first sealing surface 112, the second plane 125 extends from the first sealing surface 112 of the housing main body 11 along the extending direction of the liquid outlet channel 121, the first plane 124 and the second plane 125 form an obtuse angle, and the first plane 124 and the second plane 125 are connected by an arc surface. By such arrangement, the inclined first plane 124 and the shell main body 11 can be spaced, so that the forming of the first plane 124 is not affected by the shape of the shell main body 11, the structure at the position of the first plane 124 can be conveniently formed, and the first plane 124 can be better ensured to be parallel to the virtual reference line, so that the structures of the first plane 124 and the second plane 125 are more regular, and the forming difficulty at the positions of the first plane 124 and the second plane 125 is reduced. Of course, in other embodiments, it is also possible to arrange the second sealing surface 123 as a plane inclined with respect to the extension direction of the outlet channel 121, and to provide a smooth connection between the second sealing surface 123 and the first sealing surface 112.

In some embodiments, the liquid outlet channel 121 includes a complete hole section and a split groove section 122 located between the first plane 124 and the two second planes 125, the pump cover 20 is provided with an arc-shaped groove 22 corresponding to the split groove section 122, and the arc-shaped groove 22 and the split groove section 122 are split to form a complete flow passage connected with the complete hole section. With the arrangement, the situation that the fluid is disturbed due to the sudden change of the aperture in the process of flowing from the inlet side to the outlet side of the liquid outlet channel 121 can be avoided, so that the fluid can stably flow in the liquid outlet channel 121.

In some embodiments, a reinforcing rib 126 is provided on the outer side of spout 12 at first plane 124, reinforcing rib 126 extends along the circumferential direction of spout 12, and first plane 124 extends to reinforcing rib 126. So set up, can increase the structural strength of liquid outlet nozzle 12 through strengthening protruding muscle 126, can increase the width of first plane 124 moreover to can increase the area of contact of first plane 124 with pump lid 20, can further promote the leakproofness between pump case 10 and the pump lid 20.

In some embodiments, the accommodating cavity 111 is a rotary cavity structure, and the liquid outlet channel 121 extends along a tangential direction of the accommodating cavity 111. That is, the liquid outlet channel 121 extends along the tangential direction of the rotation direction of the impeller assembly 40, so that the direction in which the fluid is thrown out by the impeller assembly 40 is relatively consistent with the extending direction of the liquid outlet channel 121 when the impeller assembly 40 rotates, the fluid thrown out by the impeller assembly 40 can better flow into the liquid outlet channel 121, and the possibility of generating turbulence in the impeller chamber is reduced.

In some embodiments, at least one of the annular mating surface 26 and the annular sealing surface 101 is provided with a sealing groove 23, the sealing groove 23 is in a closed ring shape extending along the circumferential direction of the annular sealing surface 101, and the pump head structure 100 further includes a sealing ring 31, and the sealing ring 31 is installed in the sealing groove 23 to abut between the pump shell 10 and the pump cover 20. Specifically, the seal groove 23 may be provided only at the annular mating face 26; alternatively, the seal groove 23 may be provided only on the annular seal surface 101; alternatively, the seal groove 23 may be provided on both the annular mating face 26 and the annular sealing face 101.

The annular mating surface 26 is substantially the same as the annular sealing surface 101, the shape of the sealing groove 23 is substantially the same as the structure of the annular sealing surface 101, and when the sealing ring 31 is mounted in the sealing groove 23, the sealing ring 31 partially protrudes out of the sealing groove 23, that is, the sealing ring 31 protrudes relative to the annular mating surface 26 (the annular sealing surface 101), so that when the pump cover 20 is covered on the pump shell 10, a certain amount of compression of the sealing ring 31 can be achieved, and stable sealing is ensured. Of course, in other embodiments, the sealing between the pump casing 10 and the pump cap 20 may be achieved only by the close fit of the annular mating surface 26 and the annular sealing surface 101.

In some embodiments, the ratio of the groove depth of the sealing groove 23 to the thickness of the sealing ring 31 is not less than 0.7 and not more than 0.85. Specifically, the thickness of the seal ring 31, that is, the thickness of the seal ring 31 in the groove depth direction of the seal groove 23 in a free state, for example, when the cross section of the seal ring 31 is circular, the thickness of the seal ring 31, that is, the cross-sectional diameter of the seal ring 31. It can be understood that the deformation amount of the seal ring 31 is limited, and if the ratio of the groove depth of the seal groove 23 to the thickness of the seal ring 31 is too small, when the seal ring 31 is mounted in the seal groove 23, the protrusion height of the seal ring 31 relative to the annular mating surface 26 (the annular sealing surface 101) is too large, so that when the pump cap 20 covers the pump housing 10, due to the abutting of the protrusion portion of the seal ring 31, a gap may exist between the annular mating surface 26 and the annular sealing surface 101, and the sealing performance is reduced. If the ratio of the groove depth of the sealing groove 23 to the thickness of the seal ring 31 is too large, the compression amount of the seal ring 31 is too small when the pump cover 20 is fitted to the pump housing 10, and the sealing effect is poor. When the ratio of the groove depth of the sealing groove 23 to the thickness of the sealing ring 31 is set to be 0.7 to 0.85, the above problems can be effectively prevented, and the sealing effect between the annular matching surface 26 and the annular sealing surface 101 is ensured to be good. The ratio of the groove depth of the sealing groove 23 to the thickness of the sealing ring 31 may be specifically 0.7, 0.75, 0.8, or 0.85, and the like.

In some embodiments, the pump cover 20 is detachably connected to the pump case 10, so that the pump cover 20 and the pump case 10 can be conveniently disassembled, for example, in an experimental test stage, the pump cover 20 and the pump case 10 can be repeatedly disassembled, the practicability is improved, and the cost is reduced. Of course, in other embodiments, the pump cap 20 and the pump housing 10 may be bonded or welded together.

In some embodiments, the outer peripheral portion of the annular sealing surface 101 is provided with a plurality of first studs 127, the pump head structure 100 further includes a fastening bolt 32 and a nut 33, the fastening bolt 32 is disposed through the first studs 127 and the second studs 24, and is screwed with the nut 33, and the pump head structure 20 is provided with one second stud 24 corresponding to each first stud 127. Specifically, the first stud 127 and the second stud 24 are provided with through holes for bolts to pass through, so that the pump shell 10 and the pump cover 20 are fixed through the fastening bolts 32 and the nuts 33, the connection stability of the pump shell 10 and the pump cover 20 can be ensured, and the sealing performance is improved. And the arrangement of the first stud 127 and the second stud 24 can play a role of reinforcing ribs, and can improve the structural strength of the pump cover 20 and the pump shell 10. Of course, in other embodiments, the pump cap 20 and the pump housing 10 may be fixed by a snap structure.

In some embodiments, the pump housing 10 has at least two first positioning portions 128, the pump cover 20 has at least two second positioning portions 25, and each first positioning portion 128 and each second positioning portion 25 are in one-to-one insertion fit. Specifically, one of the first positioning portions 128 is an insertion hole, and the other one is a column, so that when the pump cover 20 and the pump housing 10 are mounted, the pump cover 20 and the pump housing 10 can be positioned and mounted by the plurality of first positioning portions 128 and the plurality of second positioning portions 25, the assembly accuracy of the pump cover 20 and the pump housing 10 can be improved, and the sealing performance between the pump cover 20 and the pump housing 10 can be improved.

In some embodiments, the impeller assembly 40 includes an impeller 41, a rotor housing 42, and a first magnetic levitation module, a side of the impeller 41 facing the pump housing 10 is provided with a blade, the rotor housing 42 and a side of the impeller 41 facing away from the pump cover 20 enclose a mounting cavity, the first magnetic levitation module is mounted in the mounting cavity, and the first magnetic levitation module is used for cooperating with a second magnetic levitation module in the stator assembly 500 of the centrifugal pump to suspend the impeller assembly 40 in the impeller chamber.

When the pump head structure 100 is mounted on the stator assembly 500, the first magnetic suspension module and the second magnetic suspension module can be matched, and the impeller assembly 40 can be suspended in the impeller chamber by utilizing the principle that like poles repel and opposite poles attract between the excitation magnetic fields of the first magnetic suspension module and the second magnetic suspension module. While generating the driving force to drive the impeller assembly 40 to move in a levitated state. Therefore, there is no mechanical contact structure (e.g., bearing) between the impeller assembly 40 and the pump casing 10, which can generate higher acceleration and deceleration, and has less mechanical wear, and can also reduce the heat generated by friction when the impeller assembly 40 rotates. Is suitable for the fields of severe environment, extremely cleanness, no pollution and special requirements. When the centrifugal pump is used, the blood coagulation and other conditions caused by the problems of heat generated by friction between the impeller assembly 40 and the pump shell 10 and the like can be reduced. And as a centrifugal pump used in the semiconductor industry, the cleaning of the fluid can be ensured. Of course, in other embodiments, the impeller assembly 40 may be mounted to the pump casing 10 by a rotating shaft.

The utility model discloses still provide a centrifugal pump, please combine to refer to fig. 2 and fig. 5, this centrifugal pump includes stator assembly 500 and pump head structure 100, and above-mentioned embodiment is referred to this pump head structure 100's concrete structure, because this centrifugal pump has adopted all technical scheme of above-mentioned all embodiments, consequently has all beneficial effects that the technical scheme of above-mentioned embodiment brought at least, and here is no longer repeated one by one. Wherein the pump head structure 100 is mounted to the stator assembly 500.

In some embodiments, the impeller assembly 40 of the pump head structure 100 is provided with a first magnetic levitation module, the stator assembly 500 includes a stator housing 50 and a second magnetic levitation module provided in the stator housing 50, the stator housing 50 is provided with a socket and an accommodating space communicated with the socket, and the pump housing 10 of the pump head structure 100 is removably mounted in the accommodating space; the first magnetic levitation module cooperates with the second magnetic levitation module to suspend the impeller assembly 40 within the impeller chamber of the pump head structure 100.

Specifically, the pump casing 10 is removably mounted to the receiving space through the socket, wherein the receiving space may be separated from the inner cavity of the stator housing 50, for example, the top of the stator housing 50 is recessed toward the receiving space. It is also possible to connect the accommodating space with the inner cavity of the stator housing 50, for example, only a socket is provided on the stator housing 50, and a part of the space in the stator housing 50 corresponding to the socket is empty, so as to form an accommodating space for inserting the pump casing 10, i.e., the accommodating space is separated from the rest of the inner cavity of the stator housing 50 without a partition.

The centrifugal pump is provided with the stator assembly 500 and the pump head structure 100 which are separated, so that the stator housing 50 of the stator assembly 500 is provided with a socket and an accommodating space communicated with the socket, the impeller assembly 40 is rotatably arranged in the pump shell 10 of the pump head structure 100, and when the pump shell 10 is inserted into the accommodating space through the socket, the second magnetic suspension module of the stator assembly 500 is matched with the first magnetic suspension module of the impeller assembly 40, so that the impeller assembly 40 rotates in a suspended manner in the impeller chamber. Because parts such as a shaft, a bearing and the like do not exist in the impeller chamber, the conditions that the blood state is influenced (blood coagulation is caused by heat generated by friction) and blood is polluted due to heat generated by friction of the shaft and the bearing, abrasion substances and the like can be avoided, the influence of the pump on the blood is greatly reduced, and the cleanness of the blood is ensured. Meanwhile, the pump shell 10 can be inserted into the stator shell 50, and the stator shell 50 can be inserted into and pulled out of the pump shell, when the pump head structure 100 is damaged or the pump head structure 100 cannot be used continuously due to sanitary requirements (for example, when the pump head structure is used as a blood pump), only the pump head structure 100 needs to be replaced, and the stator assembly 500 does not need to be replaced, so that the stator assembly 500 can be reused, the replacement cost can be reduced, the resource waste can be reduced, and the resource utilization rate of the centrifugal pump is improved. Of course, in other embodiments, the pump casing 10 may be fixed in the (non-detachable) accommodating space.

Referring to fig. 1 to 8, in some embodiments, the first magnetic levitation module includes a first permanent magnet ring 431, a first core ring 432, a second permanent magnet ring 434, and a second core ring 433, which are coaxially disposed, the first permanent magnet ring 431 and the first core ring 432 are located above the second core ring 433, and the second permanent magnet ring 434 is disposed around an outer circumferential surface of the second core ring 433.

The second magnetic suspension module comprises a stator permanent magnet ring 610, a stator core ring 620, a magnetic conductive disc 660, a displacement sensor 630 and a plurality of coil windings which are arranged in the stator shell 50, wherein the coil windings comprise a stator core 641, a suspension coil 642 and a driving coil 643 which extend along the vertical direction, the suspension coil 642 and the driving coil 643 are respectively sleeved on the stator core 641 along the vertical direction, and the plurality of coil windings are uniformly distributed around the accommodating space along the circumferential direction; the stator permanent magnet ring 610 and the stator core ring 620 are both disposed above the stator core 641, the stator permanent magnet ring 610 and the stator core ring 620 are both disposed around the accommodating space, the lower end of the stator core 641 is fixed to the magnetic conductive disc 660 in an abutting manner, and the suspension coil 642 and the driving coil 643 are located on one side of the magnetic conductive disc 660 facing the accommodating space.

The displacement sensor 630 is used for detecting radial deviation of the impeller assembly 40 in the accommodating space, the suspension coil 642 is connected with the displacement sensor 630, and the suspension coil 642, the stator core 641, the magnetic conductive disc 660, the second core ring 433 and the second permanent magnet ring 434 form a suspension magnetic circuit system so as to suspend the impeller assembly 40 in the impeller chamber; the stator permanent magnet ring 610, the stator iron core ring 620, the first permanent magnet ring 431 and the first iron core ring 432 form a reinforced magnetic circuit system so as to enhance the axial suspension force of the impeller assembly 40; the driving coil 643, the stator core 641, the magnetic conductive disk 660, the second core ring 433, and the second permanent magnet ring 434 constitute a driving rotation magnetic circuit system, so that the impeller assembly 40 rotates in the impeller chamber.

In this embodiment, the pump casing 10 may be installed in the accommodating space in a pluggable manner, or the pump casing 10 may be fixed (or not detachable) in the accommodating space; so that the part of the pump case 10 provided with the second magnetic suspension module is located in the accommodating space.

Specifically, the installation cavity is a sealed cavity. The impeller unit 40 and the stator assembly 500 are isolated from each other by the pump housing 10, and in the impeller unit 40, the radial dimensions of the first permanent magnet ring 431, the first core ring 432, and the second permanent magnet ring 434 are preferably the same, and the inner circumferential surface of the second permanent magnet ring 434 abuts against the outer circumferential surface of the second core ring 433, and the outer circumferential surface of the second permanent magnet ring 434 abuts against the inner circumferential surface of the rotor housing 42, so that the second permanent magnet ring 434 can be held and fixed in the rotor housing 42. The first iron core ring 432, the second iron core ring 433, the stator iron core ring 620, the stator iron core 641 and the magnetic conductive disc 660 are all made of soft magnetic materials, do not produce a magnetic field (magnetic lines of force) and only play a role in magnetic line transmission in a magnetic circuit, and the first iron core ring 432, the second iron core ring 433, the stator iron core ring 620, the stator iron core 641 and the magnetic conductive disc 660 are made of soft iron with high magnetic permeability, A steel, soft magnetic alloy and the like, or can be made of yoke iron made by stacking silicon steel sheets. For the stator assembly 500, the lower ends of all the stator cores 641 are abutted to the magnetic conductive disc 660, so that the magnetic field generated by the levitation coil 642 and the driving coil 643 conducts magnetic lines of force through the stator cores 641 and the magnetic conductive disc 660, and further the magnetic field generated by the levitation coil 642 and the driving coil 643 is concentrated in the upper space of the magnetic conductive disc 660.

When the pump head structure 100 is correctly mounted on the stator assembly 500 and the suspension coil 642 is energized, the suspension coil 642 generates a suspension magnetic field, the suspension coil 642, the stator core 641, the magnetic conductive disc 660, the second core ring 433, the magnetic conductive disc 660, and the second permanent magnetic ring 434 form a closed magnetic circuit, that is, a suspension magnetic circuit system, and at this time, the impeller assembly 40 is under the action of magnetic suspension force, and thus statically suspends in the impeller chamber. When the levitation coil 642 and the driving coil 643 are simultaneously energized, the impeller assembly 40 is in a levitation state, and the driving coil 643, the stator core 641, the magnetic conductive disc 660, the second core ring 433, and the second permanent magnet ring 434 form a closed magnetic circuit, that is, a rotating magnetic circuit system, so that the impeller assembly 40 rotates in a levitation manner in the impeller chamber. The driving coil 643 drives the impeller assembly 40 to rotate according to a similar operation principle as the permanent magnet synchronous motor, and is not described in detail herein. It should be noted that the levitation coil 642 and the driving coil 643 respectively and independently operate, and the magnitude, frequency, and waveform of the current flowing through the levitation coil 642 and the driving coil 643 are different, so as to avoid the phenomenon of magnetic field coupling between the generated levitation magnetic field and the driving rotating magnetic field.

During the suspension process of the impeller assembly 40, when the impeller assembly 40 is deflected in the radial direction (horizontal direction), a signal of the displacement sensor 630 is changed, and a deflection signal detected by the displacement sensor 630 is transmitted to the suspension coil 642 through a processing unit (including, but not limited to, an amplifying circuit, a comparing circuit, etc.), so that a current parameter of the suspension coil 642 is adjusted, an original suspension magnetic field balance state is destroyed, a maxwell pulling force opposite to the radial deflection direction is generated, and the impeller assembly 40 is restored to an original suspension position. The stator permanent magnet ring 610, the stator core ring 620, the first permanent magnet ring 431, and the first core ring 432 form a closed magnetic circuit, so as to form a strengthened magnetic circuit system, which can enhance the suspension force (suspension stiffness) of the impeller assembly 40 in the axial direction, and when the impeller assembly 40 is offset in the axial direction (vertical direction), it can be known according to the minimum reluctance principle: the first permanent magnet ring 431 and the first iron core ring 432 generate opposite axial magnetic pulling forces relative to the stator permanent magnet ring 610 and the stator iron core ring 620, so that the impeller assembly 40 is restored to the original suspension position. In this way, both the radial offset and the axial offset of the impeller assembly 40 can be effectively suppressed, so as to greatly improve the suspension stability of the impeller assembly 40 in the suspension state.

It can be understood that, for the first permanent magnet ring 431 and the stator permanent magnet ring 610, in order to form a closed magnetic circuit, the first permanent magnet ring 431 and the stator permanent magnet ring 610 are axially magnetized, and the magnetizing directions of the first permanent magnet ring 431 and the stator permanent magnet ring 610 are opposite.

By forming a suspension magnetic circuit system, a rotating magnetic circuit system and a reinforced magnetic circuit system between the stator assembly 500 and the impeller assembly 40, on one hand, the suspension force (suspension rigidity) of the impeller assembly 40 in the axial direction is enhanced, and on the other hand, the radial offset and the axial offset of the impeller assembly 40 are effectively inhibited, so that the suspension stability of the impeller assembly 40 is greatly improved.

Further, in this embodiment, the second permanent magnet ring 434 includes a plurality of pairs of permanent magnet segments 435 arranged at intervals along the outer circumferential surface of the second core ring 433, each pair of permanent magnet segments 435 is symmetrically arranged along the axis of the impeller assembly 40, the magnetizing direction of each permanent magnet segment 435 is radial magnetizing, and the magnetizing directions of adjacent permanent magnet segments 435 are opposite. As such, when the drive coil 643 is energized, a rotational drive force is generated between the second permanent magnet ring 434 and the drive coil 643, thereby driving the impeller assembly 40 to rotate within the impeller chamber. The plurality of segment permanent magnet tiles 435 are preferably uniformly distributed along the outer circumferential surface of the second core ring 433 such that the impeller assembly 40 can be uniformly driven by the rotational driving force. Further, for the coil windings, the levitation coil 642 is preferably located below the drive coil 643 to allow the drive coil 643 to be disposed relatively close to the impeller assembly 40 to generate a stronger rotational drive force to better drive the impeller assembly 40 to rotate.

In order to fix the second permanent magnet ring 434 conveniently, a sector partition block 436 is filled and fixed between every two adjacent sector permanent magnet tiles 435, and the sector partition block 436 and the sector permanent magnet tiles 435 are spliced in sequence to form a closed ring. In this way, due to the presence of the sector-shaped partition stoppers 436, both circumferential ends of the sector-shaped permanent magnet tiles 435 are abutted and fixed, thereby fixing the sector-shaped permanent magnet tiles 435. It can be understood that the permanent magnet segments 435 are clamped and fixed between the inner circumferential surface of the rotor housing 42 and the outer circumferential surface of the second core ring 433.

It should be noted that there are other variant structures for the second permanent magnet ring 434, for example, the second permanent magnet ring 434 is an annular magnetic ring that is charged radially outward and charged with multiple poles at the outer diameter, the charging directions of the annular magnetic ring are alternately and oppositely arranged in the circumferential direction, and the number of the magnetic poles of the annular magnetic ring is even.

Further, the impeller assembly 40 further includes a blocking ring 438, and the first permanent magnet ring 431, the first iron core ring 432, the blocking ring 438, and the second permanent magnet ring 434 are sequentially and vertically abutted from top to bottom in the rotor housing 42. By providing the barrier ring 438, the first core ring 432 and the second permanent magnet ring 434 are prevented from contacting each other, thereby reducing magnetic circuit interference. And because of being provided with the baffle ring 438, the first permanent magnet ring 431, the first iron core ring 432, the baffle ring 438 and the second permanent magnet ring 434 are all clamped and fixed between the upper end face and the lower end face of the rotor shell 42, thereby realizing the stability of the internal structure of the impeller assembly 40. It should be noted that the baffle ring 438 and the sector baffle 436 may be made of plastic or ceramic, which does not affect the passing of the magnetic force lines and the conducting direction of the magnetic force lines.

The stator assembly 500 further includes a fixed plate 650 and a magnetic conductive plate 660, and the upper end of the stator core 641 is inserted and fixed to the fixed plate 650; both the levitation coil 642 and the drive coil 643 are located between the fixed disk 650 and the magnetically permeable disk 660. The fixed disk 650 and the magnetic conductive disk 660 jointly realize the fixation of the coil winding.

Further, the stator core 641 includes a core bar 641a and a yoke portion 641b, the yoke portion 641b extends horizontally from a top end of the core bar 641a, and the yoke portion 641b is disposed toward the axial direction of the stator assembly 500; the yoke part 641b is provided corresponding to the second permanent magnet ring 434. The yoke portion 641b functions to conduct magnetic lines of force in the magnetic circuit, thereby facilitating formation of a levitation magnetic circuit system and a rotary magnetic circuit system.

In the present embodiment, the displacement sensor 630 is located at the gap formed between the stator permanent magnet ring 610 and the stator core 641, the displacement sensor 630 is an eddy current sensor, and the displacement sensor 630 extends horizontally and is disposed toward the axial direction of the stator assembly 500. The sensing surface of the displacement sensor 630 is disposed toward the outer circumferential surface of the impeller assembly 40, so that the displacement sensor 630 generates a corresponding electrical signal when the impeller assembly 40 is radially offset.

Further, the number of the displacement sensors 630 is two, two displacement sensors 630 are distributed along the circumferential direction of the stator assembly 500 and in the same horizontal plane, and the two displacement sensors 630 are distributed at an included angle of a certain interval. In this manner, the sensitivity and accuracy of the displacement sensor 630 to detecting radial displacement of the impeller assembly 40 may be improved.

For the distribution structure of the displacement sensors 630, there may be the following: the number of the displacement sensors 630 is at least three, and the plurality of displacement sensors 630 are in the same horizontal plane and are uniformly distributed at intervals along the circumferential direction of the stator assembly 500. For example, the displacement sensors 630 may be three (or six) and may be spaced at 120-degree (or 60-degree) intervals. Preferably, the number of the displacement sensors 630 is four, and two displacement sensors 630 are grouped together to form a differential circuit system, so as to further improve the detection sensitivity and accuracy of the displacement sensors 630 for the radial displacement of the impeller assembly 40.

In order to facilitate the installation of the fixed displacement sensor, in this embodiment, an installation ring 670 is disposed between the stator permanent magnet ring 610 and the upper end of the stator core 641, the installation ring 670 is clamped and fixed between the stator permanent magnet ring 610 and the stator core 641, the installation ring 670 and the stator permanent magnet ring 610 are coaxially disposed, and the radial dimensions of the installation ring 670 and the stator permanent magnet ring 610 are the same. The mounting ring 670 is provided with a mounting hole for fixing the displacement sensor 630 along the radial direction thereof, so as to fix the displacement sensor 630. The mounting ring 670 may be made of plastic or ceramic material, which does not affect the passage of the magnetic lines of force and does not affect the conduction direction of the magnetic lines of force. Of course, in other embodiments, the first magnetic levitation module and the second magnetic levitation module can also adopt other existing magnetic levitation technologies.

The above only is the preferred embodiment of the present invention, not limiting the scope of the present invention, all the equivalent structure changes made by the contents of the specification and the drawings under the inventive concept of the present invention, or the direct/indirect application in other related technical fields are included in the patent protection scope of the present invention.

Claims

1. A pump head structure for a centrifugal pump, the pump head structure comprising:

2. A pump head construction as claimed in claim 1, wherein said second sealing surface comprises a first flat surface disposed obliquely to the direction of extension of said outlet passage and two second flat surfaces disposed on opposite sides of said outlet passage and extending in the direction of extension of said outlet passage, said second flat surfaces being connected between said first sealing surface and said first flat surface, said first flat surface and said second flat surface being in smooth connection.

3. A pump head structure as claimed in claim 2, wherein a reinforcing rib is provided on an outer side of the spout at the first plane, the reinforcing rib extending circumferentially of the spout, the first plane extending to the reinforcing rib; and/or the presence of a gas in the gas,

the liquid outlet channel comprises a complete hole section and a splicing groove section positioned between the first plane and the two second planes, the pump cover is provided with an arc-shaped groove corresponding to the splicing groove section, and the arc-shaped groove and the splicing groove section are spliced to form a complete flow passage connected with the complete hole section.

4. A pump head structure as claimed in claim 1, wherein the pump cover is removably attached to the pump housing; and/or the accommodating cavity is of a rotary cavity structure, and the liquid outlet channel extends along the tangential direction of the accommodating cavity.

5. A pump head structure as recited in claim 1, wherein the pump cover defines a continuous annular mating surface that sealingly engages the annular sealing surface, at least one of the annular mating surface and the annular sealing surface defining a sealing groove that is in the form of a closed loop extending circumferentially around the annular sealing surface, the pump head structure further comprising a sealing ring that is received in the sealing groove to abut between the pump housing and the pump cover.

6. A pump head construction as claimed in claim 5, wherein the ratio of the groove depth of the sealing groove to the thickness of the sealing ring is not less than 0.7 and not more than 0.85.

7. A pump head structure as claimed in claim 1, wherein the outer peripheral portion of the annular sealing face is provided with a plurality of first studs, and the pump cap is provided with a second stud for each of the first studs, the pump head structure further comprising a fastening bolt and a nut, the fastening bolt being disposed through the first and second studs and being threadedly engaged with the nut; and/or the presence of a gas in the gas,

the pump case is provided with at least two first positioning parts, the pump cover is provided with at least two second positioning parts, and the first positioning parts and the second positioning parts are in one-to-one corresponding splicing fit.

8. A pump head structure as claimed in any one of claims 1 to 7, wherein the impeller assembly comprises an impeller having the vanes on a side thereof facing the pump housing, a rotor housing enclosing a mounting cavity with a side of the impeller facing away from the pump housing, and a first magnetically levitating module mounted within the mounting cavity, the first magnetically levitating module being adapted to cooperate with a second magnetically levitating module in a stator assembly of the centrifugal pump to levitate the impeller assembly within the impeller chamber.

9. A centrifugal pump comprising a stator assembly and a pump head structure as claimed in any one of claims 1 to 8, said pump head structure being mounted to said stator assembly.

10. The centrifugal pump according to claim 9, wherein said impeller assembly of said pump head structure is provided with a first magnetic levitation module, said stator assembly comprises a stator housing and a second magnetic levitation module provided in said stator housing, said stator housing is provided with a spigot and an accommodation space communicating with said spigot, and a pump casing of said pump head structure is removably mounted in said accommodation space; the first magnetic suspension module is matched with the second magnetic suspension module so that the impeller assembly is suspended in an impeller chamber of the pump head structure.