Miniaturized centrifugal conveying device

Abstract

The invention relates to a miniaturized centrifugal conveying device which comprises a pump head and a stator assembly, the pump head comprises a rotor and a pump shell, the rotor is located in the pump shell, the stator assembly is located on the radial outer side of the rotor, the rotor comprises a permanent magnet, the stator assembly drives the permanent magnet through magnetic force to enable the rotor to suspend and rotate, and the stator assembly comprises a magnet yoke and a coil. The magnet yoke comprises an annular magnet yoke, and the coils are wound on the outer side of the annular magnet yoke. The coils of the stator assembly are uniformly distributed on the annular magnet yoke, which is different from the conventional magnetic suspension motor in which the coils are wound along the axial magnet yoke, the coils occupy the unused redundant space around the annular magnet yoke of the magnetic suspension motor, and the space occupied by the coils in the axial direction depends on the thickness of the coils. And the thickness of the coil is far smaller than the axial length of the coil, so that the occupation of the stator assembly on the axial space is reduced, and the flattening of the stator assembly and the pump is facilitated.

Description

Technical Field

[0001] The present invention relates to the field of fluid conveying devices, and particularly to a miniaturized centrifugal conveying device. Background Art

[0002] Magnetic suspension bearingless pumps utilize active magnetic suspension technology to achieve the suspension and rotation of a rotor with an impeller, without relying on traditional mechanical bearings, seals, or lubricants. Magnetic suspension bearingless pumps not only greatly reduce the physical contact inside the pump, but also significantly improve the performance and reliability of the pump.

[0003] However, the overall space occupied by existing magnetic suspension bearingless pumps is relatively large, especially the axial space, which is not conducive to applications in scenarios with limited installation space. Summary of the Invention

[0004] The present invention aims to solve the above problems and provides a miniaturized centrifugal conveying device, which solves the problem of large space occupation of existing magnetic suspension bearingless pumps.

[0005] A miniaturized centrifugal conveying device includes: a pump head and a stator assembly. The pump head includes a rotor and a pump housing. The rotor is located inside the pump housing, and the stator assembly is located radially outside the rotor. The rotor includes a permanent magnet rotor, and the stator assembly drives the permanent magnet rotor by magnetic force to make the rotor suspended and rotate. The stator assembly includes a magnetic yoke and coils. The magnetic yoke includes an annular magnetic yoke, and multiple coils are respectively wound outside the annular magnetic yoke.

[0006] Preferably, the rotor further includes blades and a rotor housing. The permanent magnet rotor is a radially magnetized annular permanent magnet or multiple permanent magnets are evenly arranged circumferentially. The permanent magnets are completely located inside the rotor housing and are fixedly connected to the rotor housing, and the rotor housing is fixedly connected to the blades.

[0007] Preferably, the axial length of the coil is greater than twice the coil thickness.

[0008] Preferably, the magnetic yoke further includes axial arms. Multiple axial arms are evenly arranged circumferentially along the annular magnetic yoke. The axial arms are in contact with the annular magnetic yoke and are fixed in position. There is at least one coil between two adjacent axial arms.

[0009] Preferably, the axial arm includes a radial portion and an axial portion. One end of the axial portion is fixedly connected to the annular magnetic yoke, and the other end is integrally formed with the radial portion; the radial portion extends towards the direction close to the permanent magnet rotor.

[0010] Preferably, the stator assembly includes a housing. The housing is formed with an axially penetrating housing hole. The pump housing is inserted into the housing hole and is fixedly connected to the housing. The lower end of the pump housing inserted into the housing hole is formed with an inlet, and the pump housing is formed with an outlet. The inlet and the outlet are respectively communicated with the inside of the pump housing; The said inlet is completely located inside the housing hole.

[0011] Preferably, the first inner cavity inside the pump housing is located in the housing hole, the permanent magnet rotor is located in the first inner cavity, the wall thickness of the inlet is greater than the wall thickness of the pump housing radially outside the first inner cavity, a groove is formed on the outer side of the inlet, a protrusion is formed on the inner wall of the housing hole, and the protrusion is inserted into the groove to limit the relative rotation of the inlet with respect to the housing. The inlet is formed with external threads or internal threads.

[0012] Preferably, the upper part of the pump housing is located outside the housing hole, the upper part of the pump housing and the axial arm are in the same direction as the annular magnetic yoke, the outlet is located on the upper part of the pump housing, a second inner cavity is formed inside the upper part of the pump housing, the blade is located in the second inner cavity, a downward cone is formed on the inner wall on the upper side of the second inner cavity, the top of the cone faces downward, and the cone and the through hole of the inlet are on the same axis.

[0013] Preferably, an axially penetrating rotor housing through hole is formed in the middle of the rotor housing, the rotor housing through hole and the through hole of the inlet are on the same axis, and the diameter of the rotor housing through hole is greater than the diameter of the through hole of the inlet.

[0014] Preferably, the stator assembly further includes a magnetic yoke fixing plate and a sensor bracket, the magnetic yoke fixing plate and the sensor bracket are fixedly connected, the magnetic yoke fixing plate and the sensor bracket are fixed in position relative to the housing inside the housing, the magnetic yoke fixing plate and the sensor bracket are respectively in contact with the inner wall of the lower side and the upper side of the housing, the magnetic yoke fixing plate is formed with a receiving hole for accommodating the coil, the sensor bracket is formed with a receiving groove for accommodating the axial arm and restricting the rotation of the axial arm, and the top end of the axial arm is in contact with the inner wall of the upper side of the housing.

[0015] Preferably, the stator assembly further includes a displacement sensor, the displacement sensor is installed in the sensor bracket, and the displacement sensor and the upper end of the axial arm are in the same plane.

[0016] Preferably, the stator assembly includes a housing, the housing is formed with an axially penetrating housing hole, the pump housing is inserted into the housing hole and fixedly connected with the housing, the lower end of the pump housing inserted into the housing hole is formed with an inlet, the pump housing is formed with an outlet, and the inlet and the outlet are respectively communicated with the inside of the pump housing; the inlet is completely located inside the housing hole; The stator assembly further includes a sensor bracket and a displacement sensor, the sensor bracket and the annular magnetic yoke are respectively located inside and fixed in position relative to the housing, the sensor bracket is formed with a sub-bracket, the sub-bracket is located between two adjacent coils and inside the annular magnetic yoke, the displacement sensor is radially inserted into the sub-bracket and fixedly connected with the sub-bracket, and the displacement sensor and the coil are in the same plane.

[0017] The present invention has the following advantages: 1. The coils of the stator assembly are evenly distributed on the annular yoke. Different from the existing magnetic levitation motor coils wound along the axial yoke, the coils of the present invention occupy the unused extra space around the annular yoke of the magnetic levitation motor. The space occupied by the coils in the axial direction depends on the thickness of the coils. Since the thickness of the coils is much smaller than the axial length of the coils, the occupation of the axial space by the stator assembly is reduced, which is beneficial to the flattening of the stator assembly and the pump. 2. The annular yoke on which the coils are wound leaves extra space in the center of the stator assembly. In order to further miniaturize the pump, this space is directly used as the accommodation space for the pump housing inlet, reducing the occupation of the axial space by the pump housing inlet. 3. The inner wall of the through hole of the pump housing inlet is an internal thread, so that the pump head inlet does not need to extend outside the housing hole of the housing, and the pipe joint extends into the housing hole of the housing and is connected to the inlet, reducing the axial length of the pipe joint exposed outside the housing, and further reducing the total axial space occupied by the present invention after installation and the pipe joint. 4. Protrusions are formed on the inner wall of the housing hole, and the protrusions are inserted into the grooves of the inlet to limit the relative rotation of the inlet with respect to the housing, preventing the part of the pump housing on the radial outer side of the first inner cavity with a small wall thickness from deforming due to the slight rotation of the inlet. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] In order to more clearly illustrate the technical solutions in the embodiments of the present invention or the prior art, the following will briefly introduce the drawings required for the description of the embodiments or the prior art. Obviously, the drawings in the following description are only one embodiment of the present invention. For those of ordinary skill in the art, without creative work, other implementation drawings can also be obtained according to the provided drawings.

[0019] Figure 1 : Perspective view of Embodiment 1; Figure 2 : Perspective view of the pump head and stator assembly separated in Embodiment 1; Figure 3 : Perspective view of the stator assembly of Embodiment 1 with the housing removed (first perspective); Figure 4 : Perspective view of the stator assembly of Embodiment 1 with the housing removed (second perspective); Figure 5 : Exploded perspective view of the stator assembly of Embodiment 1 with the housing removed (second perspective); Figure 6 : Top view schematic diagram of Embodiment 1; Figure 7 : At Figure 6 Cross-sectional view taken along line A-A in; Figure 8 : AtFigure 7 Cross-sectional view taken along line B-B in Figure 9 : In Figure 8 Cross-sectional view taken along line C-C in Figure 10 : Top view schematic diagram of Embodiment 2 Figure 11 : In Figure 10 Cross-sectional view taken along line D-D in Figure 12 : Perspective view of Embodiment 2 Figure 13 : Perspective view of the stator assembly of Embodiment 2 with the housing removed Figure 14 : Top view of the stator assembly of Embodiment 2 after removing the housing and the permanent magnet rotor. Detailed implementation manners

[0020] The present invention will be further described below in conjunction with the accompanying drawings and examples: The embodiments of the present invention will be described in detail below. Examples of the embodiments are shown in the accompanying drawings, where the same or similar reference numerals denote the same or similar elements or elements having the same or similar functions throughout. The embodiments described below by referring to the accompanying drawings are exemplary and are only used to explain the present invention and should not be construed as a limitation of the present invention.

[0021] In the description of the present invention, it should be noted that unless otherwise clearly defined and limited, the terms "mounted", "connected" and "connected" should be understood in a broad sense. For example, it can be a fixed connection, a detachable connection or an integral connection; it can be a direct connection or an indirect connection through an intermediate medium. For those of ordinary skill in the art, the specific meanings of the above terms in the present invention can be understood according to specific situations.

[0022] In the description of the present invention, it should be understood that the orientation or positional relationship indicated by the terms "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", etc. is based on the orientation or positional relationship shown in the accompanying drawings, and is only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be construed as a limitation of the present invention. Embodiment 1: As Figures 1 to 9As shown in the figure, a miniaturized centrifugal conveying device includes: a pump head and a stator assembly. The pump head includes a rotor 6 and a pump housing 7. The rotor 6 is located inside the pump housing 7, and the stator assembly is located radially outside the rotor 6. The rotor 6 includes a permanent magnet rotor 61. The stator assembly magnetically drives the permanent magnet rotor 61 to make the rotor 6 suspended and rotate. The stator assembly includes a magnetic yoke 1 and coils 2. The magnetic yoke 1 includes an annular magnetic yoke 11, and a plurality of coils 2 are respectively wound outside the annular magnetic yoke 11, and the axial direction of the coils 2 is distributed along the circumferential direction of the annular magnetic yoke 11, as Figure 8 shown. As Figure 7 shown, the thickness of the coils 2 is respectively in the axial and radial directions of the stator assembly. As Figure 7 and Figure 8 shown, since the sum of the thicknesses of the coils 2 on the upper and lower sides of the annular magnetic yoke 11 is less than the axial length of the coils 2, the occupation of the axial space of the stator assembly by the coils 2 is reduced, making the axial length of the stator assembly smaller.

[0023] It should be noted that in this application, the axial length of the coils 2 is the arc length of the part of the annular magnetic yoke 11 occupied by them.

[0024] Preferably, the axial length of the coils 2 is greater than twice the thickness of the coils 2.

[0025] Preferably, the rotor 6 further includes blades 62 and a rotor housing 63. The permanent magnet rotor 61 is a radially magnetized annular permanent magnet or a plurality of permanent magnets are circumferentially and evenly arranged. The permanent magnet rotor 61 is completely located inside the rotor housing 63 and is fixedly connected to the rotor housing 63. The rotor housing 63 is fixedly connected to the blades 62.

[0026] More preferably, the blades 62 are circumferentially and evenly arranged with the axis of the rotor 6 as the axis.

[0027] More preferably, the blades 62 and the rotor housing 63 are made of corrosion-resistant plastic.

[0028] Preferably, the magnetic yoke 1 further includes axial arms 12. A plurality of axial arms 12 are circumferentially and evenly arranged along the annular magnetic yoke 11. The axial arms 12 are in contact with the annular magnetic yoke 11 and are fixed in position. There is at least one coil 2 between two adjacent axial arms 12.

[0029] Preferably, the axial arm 12 includes a radial part 121 and an axial part 122. One end of the axial part 122 is fixedly connected to the annular magnetic yoke 11, and the other end is integrally formed with the radial part 121; the radial part 121 extends towards the permanent magnet rotor 61 to minimize the magnetic circuit gap between the radial part 121 and the permanent magnet rotor 61.

[0030] Preferably, as Figure 2As shown, the stator assembly includes a housing 5. The housing 5 is formed with an axially penetrating housing hole 50. A pump housing 7 is inserted into the housing hole 50 and fixedly connected to the housing 5. The lower end of the pump housing 7 inserted into the housing hole 50 is formed with an inlet 71. The pump housing 7 is formed with an outlet 72. The inlet 71 and the outlet 72 are respectively in communication with the interior of the pump housing 7; As Figure 7 and Figure 9 shown, the inlet 71 of this device faces downward, that is, towards the stator assembly. Compared with the existing magnetic levitation bearingless pump whose inlet faces upward (i.e., away from the stator assembly direction), the inlet 71 of this device does not occupy additional axial space, but utilizes the space inside the stator assembly where there was originally no equipment, thereby reducing the overall axial length of this device.

[0031] More preferably, the inlet 71 is completely located inside the housing hole 50, and the inlet 71 does not protrude from the housing hole 50, and does not occupy any axial space outside the stator assembly at all. At the same time, the pipe joint fixedly connected and in communication with the inlet 71 can extend into the housing hole 50 by a part, further reducing the overall axial length of this device and the pipe joint after being connected, and further reducing the occupation of axial space by the equipment after installation.

[0032] Preferably, the first inner cavity 74 inside the pump housing 7 is located in the housing hole 50. The permanent magnet rotor 61 is located in the first inner cavity 74. The wall thickness of the inlet 71 is greater than the wall thickness of the pump housing 7 on the radially outer side of the first inner cavity 74. The wall thickness of the first inner cavity 74 is as small as possible to reduce the magnetic circuit gap between the radial part 121 and the permanent magnet rotor 61. A groove 711 is formed on the outer side of the inlet 71. A protrusion 511 is formed on the inner wall of the housing hole 50. The protrusion 511 is inserted into the groove 711 to limit the rotation of the inlet 71 relative to the housing 5, preventing the inlet 71 from rotating when the pipe joint is threadedly connected to the inlet 71, because the rotation of the inlet 71 relative to the pump housing 7 will cause deformation of the part of the pump housing 7 on the radially outer side of the first inner cavity 74 with a smaller wall thickness. Among them, the inlet 71 is formed with an external thread or an internal thread.

[0033] Preferably, the upper part of the pump housing 7 is located outside the housing hole 50. The upper part of the pump housing 7 and the axial arm 12 are in the same direction as the annular magnetic yoke 11. The outlet 72 is located at the upper part of the pump housing 7. A second inner cavity 75 is formed inside the upper part of the pump housing 7. The impeller 62 is located in the second inner cavity 75. A downward cone 73 is formed on the inner wall of the upper side of the second inner cavity 75. The top of the cone 73 faces downward. The cone 73 and the through hole of the inlet 71 are on the same axis. The cone 73 is used to guide the fluid entering from the inlet 71 to reduce the influence of the turbulent flow generated by the fluid directly flushing the inner wall of the pump housing 7 on the stability of the rotor 6.

[0034] Among them, the first inner cavity 74 and the second inner cavity 75 are in communication.

[0035] Optionally, the outlet 72 is located radially of the pump housing 7, and the pump head is a centrifugal pump.

[0036] Optionally, the outlet 72 is located in a direction away from the inlet 71 of the pump housing 7, and the pump head is an axial flow pump.

[0037] Preferably, an axially penetrating rotor housing through-hole 60 is formed in the middle of the rotor housing 63. The rotor housing through-hole 60 and the through-hole of the inlet 71 are located on the same axis. The diameter of the rotor housing through-hole 60 is larger than the diameter of the through-hole of the inlet 71, so as to reduce the obstruction of the fluid entering from the inlet 71 by the rotor 6 and prevent the rotor 6 from being unstable due to the impact of the fluid.

[0038] Preferably, the stator assembly further includes a yoke fixing plate 3 and a sensor bracket 4. The yoke fixing plate 3 and the sensor bracket 4 are fixedly connected. The yoke fixing plate 3 and the sensor bracket 4 are fixed relative to the housing 5 inside the housing 5. The yoke fixing plate 3 and the sensor bracket 4 are respectively in contact with the lower inner wall and the upper inner wall of the housing 5. The yoke fixing plate 3 is formed with a receiving hole 32 for receiving the coil 2, and the sensor bracket 4 is formed with a receiving groove 42 for receiving the axial arm 12 and restricting the rotation of the axial arm 12. The top end of the axial arm 12 is in contact with the upper inner wall of the housing 5.

[0039] Preferably, the stator assembly further includes a displacement sensor 41. The displacement sensor 41 is installed in the sensor bracket 4, and the displacement sensor 41 and the upper end of the axial arm 12 are located in the same plane.

[0040] More preferably, the housing 5 includes a first housing 51 and a second housing 52. The first housing 51 and the second housing 52 are fixedly and detachably connected.

[0041] Working principle: The central space surrounded by the L-shaped axial arm 12 is used to accommodate the second inner cavity 75 of the pump head and the rotor 6. The permanent magnet rotor 61 is sealed in the rotor housing 63. The stator assembly drives the rotor 6 to rotate without friction through magnetic force. At the same time, the displacement sensors 41 uniformly distributed in a ring around the rotor 6 are used to detect the real-time offset of the rotor 6.

[0042] Embodiment 2: As Figures 10 to 14As shown in the figure, a miniaturized centrifugal conveying device includes: a pump head and a stator assembly. The pump head includes a rotor 6 and a pump housing 7. The rotor 6 is located inside the pump housing 7, and the stator assembly is located radially outside the rotor 6. The rotor 6 includes a permanent magnet rotor 61. The stator assembly magnetically drives the permanent magnet rotor 61 to suspend and rotate the rotor 6. The stator assembly includes a yoke 1 and coils 2. The yoke 1 includes an annular yoke 11, and a plurality of coils 2 are respectively wound outside the annular yoke 11, and the axial direction of the coils 2 is distributed along the circumferential direction of the annular yoke 11, as Figure 14 shown. As Figure 11 shown, the thickness of the coils 2 is in the axial and radial directions of the stator assembly respectively. As Figure 11 and Figure 14 shown, since the sum of the thicknesses of the coils 2 on the upper and lower sides of the annular yoke 11 is less than the axial length of the coils 2, the occupation of the axial space of the stator assembly by the coils 2 is reduced, making the axial length of the stator assembly smaller.

[0043] It should be noted that in this application, the axial length of the coils 2 is the arc length of the part of the annular yoke 11 occupied by them.

[0044] Preferably, the axial length of the coils 2 is greater than twice the thickness of the coils 2.

[0045] Preferably, the rotor 6 further includes blades 62 and a rotor housing 63. The permanent magnet rotor 61 is a radially magnetized annular permanent magnet or a plurality of permanent magnets are circumferentially and evenly arranged. The permanent magnet rotor 61 is completely located inside the rotor housing 63 and is fixedly connected to the rotor housing 63. The rotor housing 63 is fixedly connected to the blades 62.

[0046] More preferably, the blades 62 are circumferentially and evenly arranged around the axis of the rotor 6.

[0047] More preferably, the blades 62 and the rotor housing 63 are made of corrosion-resistant plastic.

[0048] Preferably, the stator assembly includes a housing 5. The housing 5 is formed with an axially penetrating housing hole 50. The pump housing 7 is inserted into the housing hole 50 and fixedly connected to the housing 5. The lower end of the pump housing 7 inserted into the housing hole 50 is formed with an inlet 71. The pump housing 7 is formed with an outlet 72. The inlet 71 and the outlet 72 are respectively communicated with the inside of the pump housing 7.

[0049] More preferably, the outlet 72 is completely located inside the pump housing 7, so as to minimize the radial space occupied by the pump. More preferably, the inlet 71 is completely located in the housing hole 50, so as to minimize the axial space occupied by the pump.

[0050] More preferably, the inlet 71 and the outlet 72 are respectively formed with internal threads and are threadedly connected to the pipe joints.

[0051] Preferably, the stator assembly further includes a sensor bracket 4 and a displacement sensor 41. The sensor bracket 4 and the annular yoke 11 are respectively located inside and fixed relative to the housing 5. The sensor bracket 4 is formed with a sub-bracket 40. The sub-bracket 40 is located between two adjacent coils 2 and inside the annular yoke 11. The displacement sensor 41 is radially inserted into the sub-bracket 40 and fixedly connected to the sub-bracket 40. Compared with the first embodiment, the displacement sensor 41 and the coil 2 in this embodiment are on the same horizontal plane, so the axial arm 12 is not required. In the first embodiment, the axial arm 12 is located at the upper end of the annular yoke 11 to provide an installation space for the displacement sensor 41 and guide the magnetic circuit. There is no axial arm 12 in this embodiment, and the axial length can be further reduced compared with the first embodiment.

[0052] More preferably, the housing 5 includes a first housing 51 and a second housing 52, and the first housing 51 and the second housing 52 are fixedly and detachably connected.

[0053] Preferably, a lower protrusion 43 is formed below the sensor bracket 4. The lower protrusion 43 contacts the lower inner wall of the housing 5. An installation gap is formed between the sensor bracket 4 and the housing 5. The circuit board 8 is located in the installation gap and fixedly connected to the sensor bracket 4. The circuit board 8 is electrically connected to the coil 2 and the displacement sensor 41, and the circuit board 8 is used to control the coil 2 according to the feedback of the displacement sensor 41. Since the inlet 71 must occupy a certain length axially, and the axially occupied length of the inlet 71 is below the rotor 6; the installation gap and the inlet 71 are on the same plane, so the circuit board 8 in the installation gap does not increase the axial space of the conveying device, improving the integration of the conveying device.

[0054] Working principle: The permanent magnet rotor 61 is sealed in the rotor housing 63. The coil 2 is located radially outside the permanent magnet rotor 61. The stator assembly drives the rotor 6 to rotate without friction through magnetic force. At the same time, the displacement sensors 41 evenly distributed annularly around the rotor 6 are used to detect the real-time offset of the rotor 6.

[0055] The present invention has been described by way of example above, but the present invention is not limited to the above specific embodiments. Any modification or variation based on the present invention falls within the scope of protection required by the present invention.

Claims

1. A miniaturized centrifugal conveying device, characterized in that, Comprising: A pump head and a stator assembly, the pump head including a rotor (6) and a pump housing (7), the rotor (6) being located inside the pump housing (7), the stator assembly being located radially outside the rotor (6), the rotor (6) including a permanent magnet rotor (61), the stator assembly magnetically driving the permanent magnet rotor (61) to suspend and rotate the rotor (6), the stator assembly including a yoke (1) and coils (2), the yoke (1) including an annular yoke (11), and a plurality of coils (2) being respectively wound outside the annular yoke (11).

2. The miniaturized centrifugal conveying device according to claim 1, wherein: The rotor (6) further includes blades (62) and a rotor housing (63), the permanent magnet rotor (61) being a radially magnetized annular permanent magnet or a plurality of permanent magnets circumferentially and evenly arranged, the permanent magnet rotor (61) being completely located inside the rotor housing (63) and fixedly connected to the rotor housing (63), and the rotor housing (63) being fixedly connected to the blades (62); The axial length of the coil (2) is greater than twice the thickness of the coil (2).

3. The miniaturized centrifugal conveying device according to claim 2, characterized in that: The yoke (1) further includes axial arms (12), a plurality of axial arms (12) being circumferentially and evenly arranged along the annular yoke (11), the axial arms (12) being in contact with the annular yoke (11) and having fixed positions, and there being at least one coil (2) between two adjacent axial arms (12).

4. The miniaturized centrifugal conveying device according to claim 3, wherein: The axial arm (12) includes a radial portion (121) and an axial portion (122), one end of the axial portion (122) being fixedly connected to the annular yoke (11) and the other end being integrally formed with the radial portion (121); the radial portion (121) extends towards the permanent magnet rotor (61).

5. The miniaturized centrifugal conveying device according to claim 3, characterized in that: The stator assembly includes a housing (5), the housing (5) being formed with an axially penetrating housing hole (50), the pump housing (7) being inserted into the housing hole (50) and fixedly connected to the housing (5), a lower end of the pump housing (7) inserted into the housing hole (50) being formed with an inlet (71), the pump housing (7) being formed with an outlet (72), and the inlet (71) and the outlet (72) being respectively in communication with the inside of the pump housing (7); The inlet (71) is completely located inside the housing hole (50).

6. The miniaturized centrifugal conveying device according to claim 5, wherein: A first inner cavity (74) inside the pump housing (7) is located in the housing hole (50), the permanent magnet rotor (61) is located in the first inner cavity (74), the wall thickness of the inlet (71) is greater than the wall thickness of the pump housing (7) radially outside the first inner cavity (74), a groove (711) is formed outside the inlet (71), a protrusion (511) is formed on the inner wall of the housing hole (50), the protrusion (511) is inserted into the groove (711) to limit the relative rotation of the inlet (71) with respect to the housing (5), and the inlet (71) is formed with an external thread or an internal thread.

7. A miniaturized centrifugal conveying device according to claim 5, characterized in that: The upper part of the pump housing (7) is located outside the housing hole (50). The upper part of the pump housing (7) and the axial arm (12) are in the same direction as the annular yoke (11). The outlet (72) is located at the upper part of the pump housing (7). A second inner cavity (75) is formed inside the upper part of the pump housing (7). The blade (62) is located in the second inner cavity (75). A downward cone (73) is formed on the inner wall of the upper side of the second inner cavity (75). The top of the cone (73) faces downward. The through hole of the cone (73) and the inlet (71) are on the same axis.

8. A miniaturized centrifugal conveying device according to claim 5, characterized in that: A rotor housing through hole (60) that penetrates axially is formed in the middle of the rotor housing (63). The rotor housing through hole (60) and the through hole of the inlet (71) are on the same axis. The diameter of the rotor housing through hole (60) is larger than the diameter of the through hole of the inlet (71).

9. The miniaturized centrifugal conveying device according to claim 5, wherein: The stator assembly further includes a yoke fixing plate (3) and a sensor bracket (4). The yoke fixing plate (3) and the sensor bracket (4) are fixedly connected. The yoke fixing plate (3) and the sensor bracket (4) are located inside the housing (5) and are fixed relative to the housing (5). The yoke fixing plate (3) and the sensor bracket (4) are in contact with the inner wall of the lower side and the inner wall of the upper side of the housing (5) respectively. The yoke fixing plate (3) is formed with a receiving hole (32) for receiving the coil (2). The sensor bracket (4) is formed with a receiving groove (42) for receiving the axial arm (12) and restricting the rotation of the axial arm (12). The top end of the axial arm (12) is in contact with the inner wall of the upper side of the housing (5). The stator assembly further includes a displacement sensor (41). The displacement sensor (41) is installed in the sensor bracket (4). The displacement sensor (41) and the upper end of the axial arm (12) are in the same plane.

10. The miniaturized centrifugal conveying device according to claim 2, wherein: The stator assembly includes a housing (5). The housing (5) is formed with a housing hole (50) that penetrates axially. The pump housing (7) is inserted into the housing hole (50) and fixedly connected to the housing (5). The lower end of the pump housing (7) inserted into the housing hole (50) is formed with an inlet (71). The pump housing (7) is formed with an outlet (72). The inlet (71) and the outlet (72) are respectively communicated with the inside of the pump housing (7). The inlet (71) is completely located inside the housing hole (50). The stator assembly further includes a sensor bracket (4) and a displacement sensor (41). The sensor bracket (4) and the annular yoke (11) are respectively located inside and are fixed relative to the housing (5). The sensor bracket (4) is formed with a sub-bracket (40). The sub-bracket (40) is located between two adjacent coils (2) and inside the annular yoke (11). The displacement sensor (41) is radially inserted into the sub-bracket (40) and fixedly connected to the sub-bracket (40). The displacement sensor (41) and the coil (2) are in the same plane. A lower protrusion (43) is formed below the sensor bracket (4). The lower protrusion (43) contacts the lower inner wall of the housing (5). An installation gap is formed between the sensor bracket (4) and the housing (5). The circuit board (8) is located in the installation gap and is fixedly connected to the sensor bracket (4). The circuit board (8) is electrically connected to the coil (2) and the displacement sensor (41). The circuit board (8) is configured to control the coil (2) based on the feedback from the displacement sensor (41).

Images