阅读说明：本技术 一种磁悬浮离心泵 (Magnetic suspension centrifugal pump ) 是由 丁强 王贝易 于 2021-09-16 设计创作，主要内容包括：本发明涉及一种磁悬浮离心泵,包括泵室,泵室安装有磁悬浮电机定子组件,磁悬浮电机定子组件中间设有离心泵叶轮转子组件,泵室侧边设有流体出口,所述磁悬浮电机定子组件包括：与泵室之间螺栓连接的定子紧固壳体,所述定子紧固壳体内部预留空腔,此空腔内壁处贴设若干分块定子块,分块定子块所围成的区域中环形阵列绕组组件,所述离心泵叶轮转子组件位于绕组组件围成的区域内,离心泵叶轮转子包括：叶轮轮体、嵌设在叶轮轮体端面内的转子本体,所述叶轮轮体外围套设有传感器支架,所述传感器支架靠近转子本体一端的端面上安装有信号电路板。解决了摩擦造成的使用寿命缩短等问题。(The invention relates to a magnetic suspension centrifugal pump, which comprises a pump chamber, wherein a magnetic suspension motor stator component is installed in the pump chamber, a centrifugal pump impeller rotor component is arranged in the middle of the magnetic suspension motor stator component, a fluid outlet is arranged at the side edge of the pump chamber, and the magnetic suspension motor stator component comprises: and the stator fastening casing of bolted connection between the pump chamber, the inside cavity of reserving of stator fastening casing, a plurality of piecemeal stator pieces of this cavity inner wall department subsides, annular array winding subassembly in the region that the piecemeal stator piece encloses, centrifugal pump impeller rotor subassembly is located the region that the winding subassembly encloses, and centrifugal pump impeller rotor includes: the impeller comprises an impeller body and a rotor body embedded in the end face of the impeller body, wherein a sensor support is sleeved on the periphery of the impeller body, and a signal circuit board is installed on the end face, close to one end of the rotor body, of the sensor support. The problem of life shortening etc. that friction caused has been solved.)

1. A magnetic suspension centrifugal pump is characterized in that: comprises a pump chamber (1), a fluid inlet (2) is arranged at the top of the pump chamber (1), a magnetic suspension motor stator component (4) is arranged at one side of the pump chamber (1) departing from the fluid inlet (2), a cavity is reserved in the middle of the magnetic suspension motor stator component (4), a centrifugal pump impeller rotor component (5) is arranged in the cavity,

the top of the pump chamber (1) is provided with an end cover, the fluid inlet (2) is positioned at the circle center of the end cover, the side edge of the pump chamber (1) is provided with a fluid outlet (3),

the magnetic levitation motor stator assembly (4) comprises: a stator fastening shell (401) connected with the pump chamber (1) through bolts, a cavity is reserved in the stator fastening shell (401), a plurality of segmented stator blocks (402) are attached to the inner wall of the cavity, a ring-shaped array winding assembly (403) is arranged in an area surrounded by the segmented stator blocks (402),

the centrifugal pump impeller rotor assembly (5) is located in an area enclosed by the winding assembly (403), and comprises: impeller wheel body (501), inlay rotor body (502) of establishing in impeller wheel body (501) terminal surface, impeller wheel body (501) periphery cover is equipped with sensor support (503), install signal circuit board (504) on sensor support (503) are close to the terminal surface of rotor body (502) one end.

2. A magnetic levitation centrifugal pump as claimed in claim 1, characterized in that: the winding assembly (403) comprises a winding framework (505), and a torque winding coil (506) and a suspension winding coil (507) are arranged on the winding framework (505); the suspension winding coil (507) is arranged close to the centrifugal pump impeller rotor assembly (5).

3. A magnetic levitation centrifugal pump as claimed in claim 2, wherein: the winding framework (505) comprises a torque framework and a suspension framework which respectively correspond to the torque winding coil (506) and the suspension winding coil (507), and the torque framework and the suspension framework respectively comprise a rod body (508) and end pieces (509) positioned on two end faces of the rod body (508); the length of the rod body (508) of the torque framework is greater than that of the rod body (508) of the suspension framework; the torque framework and the suspension framework end piece (509) are attached to each other.

4. A magnetic levitation centrifugal pump as claimed in claim 1, characterized in that: the blocking stator block (402) comprises an arc section (404) and a straight line section (405) which is led out from the arc section (404) and points to the center of the arc; two ends of the arc section (404) are respectively provided with a convex block (406) and a concave groove (407), two adjacent blocked stator blocks (402) are connected end to end, and the convex block (406) is connected with the concave groove (407) in an embedded mode.

5. The magnetic levitation centrifugal pump of claim 4, wherein: the sensor support (503) comprises a bottom ring (510) which is connected with the signal circuit board (504) in a mounting mode, a vertical rod (511) which is arranged on the bottom ring (510) in an annular array mode, and a top ring (512) which is connected to the top of the vertical rod (511).

6. The magnetic levitation centrifugal pump of claim 5, wherein: a gap is reserved between two adjacent upright rods (511), and the end part of a straight line section (405) of each segmented stator block (402) is filled in the gap between the two upright rods (511).

7. The magnetic levitation centrifugal pump of claim 5, wherein: a support protruding block (513) is arranged on the inner portion of each vertical rod (511), and a displacement coil (514) is wound on the support protruding block (513).

8. A magnetic levitation centrifugal pump as claimed in claim 1, characterized in that: the stator fastening shell (401) comprises a first shell (408) connected with the end face of the pump chamber (1) and a second shell (409) coated outside the first shell (408); the outer diameter of the first shell (408) is equal to the outer diameter of the split stator piece (402).

9. A magnetic levitation centrifugal pump as claimed in claim 1, characterized in that: and the two end faces of the magnetic suspension motor stator assembly (4) are hermetically packaged.

10. A magnetic levitation centrifugal pump as claimed in claim 1, characterized in that: the axial height of the impeller wheel body (501) is larger than that of the sensor support (503), and the blades of the impeller wheel body (501) exceed the top surface of the sensor support (503).

Technical Field

The invention relates to the technical field of centrifugal pumps, in particular to a magnetic suspension centrifugal pump.

Background

Centrifugal pumps are widely used as important transmission mechanisms in fluid delivery links. In the semiconductor industry, etching, plate making, cleaning or polishing processes require corrosive chemical liquids, the quality of the product depends on the quality of the chemical liquid, and the liquid delivery pump must be reliable in operation, free of contamination, and resistant to corrosion.

The traditional pneumatic and slice pump has short service life, the moving valve and the slice can generate impurity particles, the liquid transmission has the problems of uneven pulsation and the like, and further the process quality is influenced.

In the chemical industry, severe operation conditions such as radioactive environment or high-temperature radiation environment can have adverse effects on the use of mechanical bearings of the conventional rotating shaft sealing pump. According to statistics, the operation failure rate of the rotary shaft sealing pump related to the bearing in the chemical field is up to 20%, so that the operation and maintenance cost is increased, and the reliability of the process flow is reduced.

In the field of life sciences, centrifugal pumps, which are the core components of artificial hearts, may partially or completely replace cardiac functions. However, the conventional mechanical bearing blood pump generates friction and heat, so that blood cells are damaged, and problems such as hemolysis, blood coagulation and thrombus are caused.

Disclosure of Invention

The applicant provides a magnetic suspension centrifugal pump with a reasonable structure aiming at the defects in the prior art, reduces the bearing friction in the operation process of a pump body, and simultaneously realizes the functions of rotary driving, radial force driving and centrifugal pump impeller rotor state detection in the same stator frame, thereby prolonging the service life of equipment and improving the system integration level and the axial utilization rate.

The technical scheme adopted by the invention is as follows:

a magnetic suspension centrifugal pump comprises a pump chamber, a fluid inlet is arranged at the top of the pump chamber, a magnetic suspension motor stator component is arranged on one side of the pump chamber, which is far away from the fluid inlet, a cavity is reserved in the middle of the magnetic suspension motor stator component, a centrifugal pump impeller rotor component is arranged in the cavity,

the top of the pump chamber is provided with an end cover, the fluid inlet is positioned at the circle center of the end cover, the side edge of the pump chamber is provided with a fluid outlet,

the magnetic levitation motor stator assembly comprises: a stator fastening shell connected with the pump chamber by bolts, a cavity is reserved in the stator fastening shell, a plurality of segmented stator blocks are attached to the inner wall of the cavity, the annular array winding assembly is arranged in the area surrounded by the segmented stator blocks,

the centrifugal pump impeller rotor subassembly is located the region that the winding subassembly encloses, and centrifugal pump impeller rotor includes: the impeller comprises an impeller body and a rotor body embedded in the end face of the impeller body, wherein a sensor support is sleeved on the periphery of the impeller body, and a signal circuit board is installed on the end face, close to one end of the rotor body, of the sensor support.

The winding assembly comprises a winding framework, and a torque winding coil and a suspension winding coil are arranged on the winding framework; the suspension winding coil is arranged close to the rotor component of the centrifugal pump impeller.

The winding framework comprises a torque framework and a suspension framework which respectively correspond to the torque winding coil and the suspension winding coil, and the torque framework and the suspension framework respectively comprise a rod body and end pieces positioned on two end faces of the rod body; the length of the rod body of the torque framework is greater than that of the suspension framework; the torque framework and the suspension framework end piece are attached to each other.

The blocking stator block comprises an arc section and a straight line section which is led out from the arc section and points to the center of the arc; the two ends of the arc section are respectively provided with a convex block and a concave groove, the two adjacent sub-stator blocks are connected end to end, and the convex block is connected with the concave groove in an embedded mode.

The sensor support comprises a bottom ring which is installed and connected with the signal circuit board, a vertical rod which is annularly arrayed on the bottom ring, and a top ring which is connected to the top of the vertical rod.

A gap is reserved between every two adjacent vertical rods, and the ends of the straight line sections of the segmented stator blocks are filled in the gap between the two vertical rods.

All be equipped with the support lug on the inside of every pole setting, the winding displacement coil on the support lug.

The stator fastening shell comprises a first shell connected with the end face of the pump chamber and a second shell coated outside the first shell; the outer diameter of the first shell is equal to the outer diameter of the split stator blocks.

And the two end faces of the stator assembly of the magnetic suspension motor are hermetically packaged.

The axial height of the impeller wheel body is greater than that of the sensor support, and the blades of the impeller wheel body exceed the top surface of the sensor support.

The invention has the following beneficial effects:

1. the magnetic suspension technology is combined with the centrifugal pump technology, so that the practical problems of short service life and high operation and maintenance cost caused by bearing friction in a centrifugal pump system using mechanical bearings in the fields of semiconductor industry, chemical industry and life science are solved. In the running process of the invention, the rotor component of the centrifugal pump impeller is not in contact with the pump chamber and the stator component of the magnetic suspension motor, thus avoiding mechanical friction.

2. In the same stator frame, the functions of rotary driving, radial force driving, centrifugal pump impeller rotor state detection and the like are realized simultaneously. The system integration level and the axial utilization rate are high. In the invention, the rotation drive can be generated simultaneously by the interaction of the magnetic suspension motor stator component and the centrifugal pump impeller rotor component, and the radial force for supporting the centrifugal pump impeller rotor component to maintain the radial free stable suspension is generated simultaneously in the rotation process. The detection function is realized by the signal circuit board.

3. The impeller fluid machine and the magnetic suspension motor rotor are directly integrated, and the integration level of the impeller rotor of the centrifugal pump is improved.

Drawings

Fig. 1 is a schematic view of the overall structure of the present invention.

Fig. 2 is a schematic overall structure view of another aspect of the present invention.

Fig. 3 is an exploded view of the present invention.

Fig. 4 is a side view of the present invention.

Fig. 5 is a sectional view of section a-a of fig. 4.

Fig. 6 is a schematic view of the assembly structure of the magnetic suspension motor stator assembly and the centrifugal pump impeller rotor assembly of the invention.

Fig. 7 is a schematic diagram of another view angle of the assembly structure of the magnetic levitation motor stator assembly and the centrifugal pump impeller rotor assembly of the invention.

Fig. 8 is a schematic diagram of the structure of fig. 6 with a set of torque winding coils and a set of levitation winding coils hidden.

Fig. 9 is a schematic structural view of a magnetic levitation motor stator assembly hiding a block of partitioned stator blocks.

Fig. 10 is a schematic structural view of the centrifugal pump impeller rotor assembly hidden on the basis of fig. 9.

Fig. 11 is a schematic structural view of a segmented stator block in the present invention.

Wherein: 1. a pump chamber; 2. a fluid inlet; 3. a fluid outlet; 4. a magnetic suspension motor stator component; 5. a centrifugal pump impeller rotor assembly; 6. a packaging position;

401. a stator fastening housing; 402. partitioning the stator blocks; 403. a winding assembly; 404. a circular arc section; 405. a straight line segment; 406. a bump; 407. a groove; 408. a first housing; 409. a second housing;

501. an impeller wheel body; 502. a rotor body; 503. a sensor holder; 504. a signal circuit board; 505. a winding framework; 506. a torque winding coil; 507. a suspension winding coil; 508. a rod body; 509. an end piece; 510. a bottom ring; 511. erecting a rod; 512. a top ring; 513. a bracket projection; 514. and a displacement coil.

Detailed Description

The following describes embodiments of the present invention with reference to the drawings.

As shown in fig. 1-11, the magnetic suspension centrifugal pump of the present embodiment includes a pump chamber 1, a fluid inlet 2 is arranged at the top of the pump chamber 1, a magnetic suspension motor stator assembly 4 is installed at one side of the pump chamber 1 away from the fluid inlet 2, a cavity is reserved in the middle of the magnetic suspension motor stator assembly 4, a centrifugal pump impeller rotor assembly 5 is arranged in the cavity,

the top of the pump chamber 1 is provided with an end cover, the fluid inlet 2 is positioned at the circle center of the end cover, the side edge of the pump chamber 1 is provided with a fluid outlet 3,

the magnetic levitation motor stator assembly 4 includes: a stator fastening shell 401 connected with the pump chamber 1 through bolts, a cavity is reserved in the stator fastening shell 401, a plurality of segmented stator blocks 402 are attached to the inner wall of the cavity, a ring-shaped array winding assembly 403 is arranged in an area surrounded by the segmented stator blocks 402,

the centrifugal pump impeller rotor assembly 5 is located within the area enclosed by the winding assembly 403, and comprises: the impeller wheel body 501 and the rotor body 502 embedded in the end face of the impeller wheel body 501, a sensor support 503 is sleeved on the periphery of the impeller wheel body 501, and a signal circuit board 504 is installed on the end face of the sensor support 503 close to one end of the rotor body 502.

The winding assembly 403 comprises a winding framework 505, and a torque winding coil 506 and a suspension winding coil 507 are arranged on the winding framework 505; the levitation winding coil 507 is disposed adjacent the centrifugal pump impeller rotor assembly 5.

The winding frame 505 comprises a torque frame and a suspension frame which respectively correspond to the torque winding coil 506 and the suspension winding coil 507, and the torque frame and the suspension frame respectively comprise a rod body 508 and end pieces 509 positioned on two end faces of the rod body 508; the length of the rod body 508 of the torque framework is larger than that of the rod body 508 of the suspension framework; the torque frame and the suspension frame end plate 509 are attached to each other.

The partitioning stator block 402 comprises an arc section 404 and a straight line section 405 which is led out from the arc section 404 and points to the center of the arc; two ends of the arc section 404 are respectively provided with a convex block 406 and a concave groove 407, two adjacent sub-stator blocks 402 are connected end to end, and the convex block 406 is connected with the concave groove 407 in a jogged manner.

The sensor bracket 503 includes a bottom ring 510 mounted to the signal circuit board 504, a vertical rod 511 annularly arrayed on the bottom ring 510, and a top ring 512 connected to the top of the vertical rod 511.

A gap is reserved between two adjacent upright rods 511, and the end part of the straight line segment 405 of the segmented stator piece 402 is filled in the gap between the two upright rods 511.

Each upright 511 is provided with a bracket protrusion 513 on the inside, and a displacement coil 514 is wound on the bracket protrusion 513.

The stator fastening housing 401 includes a first housing 408 connected to an end face of the pump chamber 1, and a second housing 409 covering the first housing 408; first housing 408 has an outer diameter equal to the outer diameter of segmented stator segments 402.

And the two end surfaces of the magnetic suspension motor stator assembly 4 are hermetically packaged.

The axial height of the impeller wheel body 501 is greater than that of the sensor support 503, and the blades of the impeller wheel body 501 extend beyond the top surface of the sensor support 503.

The specific structure and working process of the embodiment are as follows:

as shown in fig. 1 and 2, the pump chamber 1 is cylindrical, the top surface of the pump chamber 1 is provided with an end cover, a pipe-shaped fluid inlet 2 extends from the center of the end cover, and a fluid outlet 3 extends from the circumference of the pump chamber 1 along the tangential direction.

Referring to fig. 3, it can be seen that a magnetic suspension motor stator assembly 4 is installed in a pump chamber 1 of the centrifugal pump, the magnetic suspension motor stator assembly 4 is annular, and a centrifugal pump impeller rotor assembly 5 is located in the middle of the magnetic suspension motor stator assembly 4.

As shown in fig. 4 and 5, which are sectional views of the centrifugal pump, the assembled relationship of the components can be seen from the sectional views, and in fig. 5, there are first end caps from top to bottom, and the bolted connections between the end caps and the pump chamber 1 form a chamber. A stator fastening housing 401 is bolted to the circumference of the pump chamber 1 on the side facing away from the end cover. The outer circle surface of stator fastening casing 401 and the outer circle surface of pump chamber 1 fall on same arc surface, combine fig. 6 and 8, stator fastening casing 401 includes first casing 408, and first casing 408 pastes on pump chamber 1 bottom end face, and second casing 409 parcel is on the outer circle surface of first casing 408.

As shown in fig. 8-10, the segmented stator blocks 402 are arranged in an annular array on the inner wall of the second shell 409, and four segmented stator blocks 402 are connected end to end in the invention; referring to fig. 11, each of the segmented stator blocks 402 is a quarter arc, the arc part is an arc segment 404, two straight line segments 405 are led out from the inner wall of the arc segment 404, the straight line segments 405 point to the center of the arc segment 404, and eight straight line segments 405 are arranged in an annular array after all the segmented stator blocks 402 are completely combined. In order to facilitate the end-to-end connection of the segmented stator pieces 402, a protrusion 406 and a groove 407 are respectively arranged at the end-to-end of each segmented stator piece 402, and the groove 407 can just receive the protrusion 406 of the previous segmented stator piece 402.

A set of winding skeletons 505 is sleeved on each straight line segment 405, and each set of winding skeletons 505 comprises two torque skeletons and two suspension skeletons with different axial lengths. The torque skeleton and the suspension skeleton both comprise a rod body 508 and end pieces 509 arranged at two ends of the rod body 508, and the length of the rod body 508 of the torque skeleton is longer than that of the rod body 508 of the suspension skeleton.

Centrifugal pump impeller rotor subassembly 5 includes the impeller wheel body 501 that is located whole centrifugal pump centre of a circle position, and rotor body 502 is inlayed to the bottom of impeller wheel body 501, establishes sensor support 503 in the outer coaxial cover of impeller wheel body 501, and sensor support 503 bottom installation signal circuit board 504, the pole setting 511 inner wall of sensor support 503 intermediate position passes through support lug 513 winding displacement coil 514.

The magnetic suspension motor stator assembly 4 interacts with the centrifugal pump impeller rotor assembly 5 to simultaneously generate a rotational driving force and a radial force supporting the radial degree of freedom stable suspension of the centrifugal pump impeller rotor assembly 5.

The stator fastening shell 401 is made of non-magnetic conductive material, and in the present invention, metal aluminum is used. The partitioned stator blocks 402 are made of silicon steel sheets and are formed by laminating along the axial direction of the centrifugal pump, and the difference between the number of pole pairs of the torque winding coil 506 and the number of pole pairs of the suspension winding coil 507 is 1.

Sensor holder 503 is embedded in the area formed by straight segments 405 of segmented stator piece 402. The sensor holder 503 houses the sensor probe of the condition sensing assembly of the impeller rotor, i.e., the displacement coil 514 in this embodiment; and a signal circuit board 504.

The detection principle of the sensor probe of the impeller rotor state detection assembly comprises but is not limited to an inductance detection principle, a capacitance detection principle, an eddy current detection principle and a Hall detection principle.

After the above-mentioned structure assembling process is completed, the two end faces of the stator fastening housing 401 are encapsulated, and the encapsulating material includes, but is not limited to, epoxy resin potting adhesive, silicone potting adhesive, polyurethane potting adhesive, and the like.

The pump chamber 1 serves as a working fluid medium processing space, and the material thereof is a corrosion-resistant material including, but not limited to, PTFE, PFA, etc. The pump chamber 1 is provided with a fluid outflow port in the radial direction as a chamber for accelerating and centrifugally discharging the fluid.

The rotor body 502 is completely enclosed by said impeller wheel 501, the function of which is to transfer mechanical energy to the working fluid medium. The impeller body 501 is made of a corrosion resistant material, including but not limited to PTFE, PFA, etc. The rotor body 502 may be a non-salient pole type permanent magnet rotor, a non-salient pole type reluctance rotor, a salient pole type reluctance rotor, or the like. The ratio of the outer diameter to the axial length of the rotor body 502 is 2.5 or greater to achieve passive stabilization in the axial degree of freedom.

The above description is intended to be illustrative and not restrictive, and the scope of the invention is defined by the appended claims, which may be modified in any manner within the scope of the invention.