Pump head and miniaturized centrifugal pump

Abstract

The pump head comprises a rotor and a pump shell, the rotor is located in the pump shell, the pump shell comprises an upper pump shell body, an inlet, an outlet and a lower pump shell body, the lower end of the upper pump shell body is fixedly connected with the lower pump shell body, a second inner cavity is formed in the upper pump shell body, a first inner cavity is formed in the lower pump shell body, and the second inner cavity is communicated with the first inner cavity. The upper end of the first inner cavity is communicated with the second inner cavity, an inlet communicated with the first inner cavity is formed in the lower end of the lower pump shell, an outlet communicated with the second inner cavity is formed in the side face of the upper pump shell, the rotor comprises a permanent magnet rotor, and the permanent magnet rotor is located in the lower pump shell. The inlet of the pump head is arranged at one end close to the rotor (namely the lower end of the pump head), and the redundant space in the middle of the stator assembly is used as the accommodating space of the inlet, so that the inlet does not need to additionally occupy the axial space, and the occupation of the pump head on the axial space is reduced.

Description

Technical Field

[0001] This utility model relates to the field of fluid transport devices, and in particular to a pump head and a miniaturized centrifugal pump. Background Technology

[0002] Magnetic levitation bearingless pumps can be centrifugal pumps. They utilize active magnetic levitation technology to suspend and rotate a rotor with an impeller, eliminating the need for traditional mechanical bearings, seals, or lubricants. Magnetic levitation bearingless pumps not only significantly reduce physical contact within the pump but also substantially improve pump performance and reliability.

[0003] However, the outlet of the existing magnetic levitation bearingless pump is radial and the inlet is axial. Since the stator assembly of the existing magnetic levitation bearingless pump is located below the pump head and the inlet is located at the top of the pump head, the magnetic levitation bearingless pump occupies a large axial space, which is not conducive to its application in scenarios with limited installation space. Utility Model Content

[0004] The present invention aims to solve the above problems by providing a pump head and a miniaturized centrifugal pump, which solves the problem of large axial space occupied by existing pump heads and pumps.

[0005] A pump head includes: a rotor and a pump housing, the rotor being located inside the pump housing, the pump housing including an upper pump housing, an inlet, an outlet, and a lower pump housing, the lower end of the upper pump housing being fixedly connected to the lower pump housing, the upper pump housing forming a second inner cavity, the lower pump housing forming a first inner cavity, the upper end of the first inner cavity communicating with the second inner cavity, the lower end of the lower pump housing forming an inlet communicating with the first inner cavity, and the side of the upper pump housing forming an outlet communicating with the second inner cavity, the rotor including a permanent magnet rotor being located inside the lower pump housing.

[0006] Preferably, the rotor further includes a rotor housing, the axis of the rotor is in the vertical direction, the permanent magnet rotor is completely located inside the rotor housing and is fixedly connected to the rotor housing, and the permanent magnet rotor is a radially magnetized annular permanent magnet or multiple permanent magnets evenly arranged around the circumference.

[0007] Preferably, the rotor further includes blades, the upper end of the rotor housing is fixedly connected to the blades, and the blades are located inside the upper pump housing.

[0008] Preferably, an axially penetrating through-hole is formed in the middle of the rotor housing, the through-hole and the inlet through-hole are located on the same axis, and the diameter of the through-hole is larger than the diameter of the inlet through-hole.

[0009] Preferably, the upper inner wall of the second inner cavity is formed with a cone pointing downwards, and the cone and the through hole of the inlet are located on the same axis.

[0010] Preferably, the inlet is formed with external or internal threads.

[0011] A miniaturized centrifugal pump using the aforementioned pump head includes: a stator assembly, a lower pump housing inserted into the stator assembly, the stator assembly being located radially outside a permanent magnet rotor, the stator assembly driving the permanent magnet rotor to levitate and rotate via magnetic force.

[0012] Preferably, the stator assembly includes a magnetic yoke, a coil, and a housing. The magnetic yoke is located inside the housing and is fixed in position to the housing. The coil is wound around the outside of the magnetic yoke. The housing has an axially through-hole. The pump housing is fixedly connected to the housing. The lower pump housing is inserted into the housing hole.

[0013] Preferably, the inlet is located entirely inside the housing bore.

[0014] Preferably, the wall thickness of the inlet is greater than the wall thickness of the lower pump casing, a groove is formed on the outer side of the inlet, and a protrusion is formed on the inner wall of the casing hole. The protrusion is inserted into the groove to restrict the rotation of the inlet relative to the casing.

[0015] This utility model has the following advantages:

[0016] 1. The pump head inlet is located at one end close to the rotor (i.e., the lower end of the pump head). The extra space in the middle of the stator assembly is used as the inlet accommodating space, so that the inlet does not need to occupy additional axial space, thus reducing the axial space occupied by the pump head.

[0017] 2. The inner wall of the through hole of the pump casing inlet is internally threaded, so that the pump head inlet does not need to extend out of the casing hole of the machine casing. Moreover, the pipe joint extends into the casing hole of the machine casing and connects with the inlet, reducing the axial length of the pipe joint exposed outside the machine casing, and further reducing the total axial space occupied by the centrifugal pump and the pipe joint after installation.

[0018] 3. The inner wall of the housing hole has a protrusion. The protrusion is inserted into the groove of the inlet to restrict the rotation of the inlet relative to the housing, and to prevent the deformation of the thinner lower pump housing caused by slight rotation of the inlet. Attached Figure Description

[0019] To more clearly illustrate the technical solutions in the embodiments of this utility model or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are only one embodiment of this utility model. For those skilled in the art, other embodiments can be derived from the provided drawings without creative effort.

[0020] Figure 1 : A 3D view of a centrifugal pump;

[0021] Figure 2: A three-dimensional view showing the pump head and stator assembly separated;

[0022] Figure 3 : A 3D view of the stator assembly without its housing (first-person perspective);

[0023] Figure 4 : A 3D view of the stator assembly without the housing (second perspective);

[0024] Figure 5 : Exploded 3D view of the stator assembly with the casing removed (second perspective);

[0025] Figure 6 Top view of a centrifugal pump;

[0026] Figure 7 :exist Figure 6 Sectional view at point AA;

[0027] Figure 8 :exist Figure 7 Sectional view at point BB;

[0028] Figure 9 :exist Figure 8 Sectional view at CC;

[0029] Figure 10 : A three-dimensional sectional view of the pump head. Detailed Implementation

[0030] The present invention will be further described below with reference to the accompanying drawings and examples:

[0031] The embodiments of this utility model are described in detail below. Examples of these embodiments are shown in the accompanying drawings, wherein 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 with reference to the accompanying drawings are exemplary and are only used to explain this utility model, and should not be construed as limiting this utility model.

[0032] In the description of this utility model, it should be noted that, unless otherwise explicitly specified and limited, the terms "installation," "connection," and "joining" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a direct connection or an indirect connection through an intermediate medium. Those skilled in the art can understand the specific meaning of the above terms in this utility model based on the specific circumstances.

[0033] In the description of this utility model, it should be understood that the terms "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are only for the convenience of describing this utility model and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this utility model.

[0034] Example 1:

[0035] like Figures 1 to 10 As shown, a pump head includes a rotor 6 and a pump housing 7. The rotor 6 is located inside the pump housing 7. The pump housing 7 includes an upper pump housing 70, an inlet 71, an outlet 72, and a lower pump housing 76. The lower end of the upper pump housing 70 is fixedly connected to the lower pump housing 76. The upper pump housing 70 forms a second inner cavity 75, and the lower pump housing 76 forms a first inner cavity 74. The upper end of the first inner cavity 74 communicates with the second inner cavity 75. The lower end of the lower pump housing 76 forms an inlet 71 that communicates with the first inner cavity 74. The side of the upper pump housing 70 forms an outlet 72 that communicates with the second inner cavity 75. The rotor 6 includes a permanent magnet rotor 61, which is located inside the lower pump housing 76. When the pump head is installed with the stator assembly, the stator assembly is located at the lower end of the upper pump housing 70, and the inlet 71 is located below the upper pump housing 70, so that the inlet 71 occupies the space in the middle of the stator assembly. Since the space in the middle of the stator assembly was originally empty, the inlet 71 does not affect the structure of the stator assembly, meaning it does not increase the space occupied by the stator assembly in the axial and radial directions. At the same time, since the inlet 71, located below the upper pump housing 70, does not occupy the space above the upper pump housing 70, the space occupied by the pump head is reduced, which is beneficial for using the pump head in confined spaces.

[0036] It should be noted that the side of the upper pump housing 70 refers to the radial surface of the upper pump housing 70.

[0037] Preferably, the rotor 6 further includes a rotor housing 63, the axis of the rotor 6 is in the vertical direction, the permanent magnet rotor 61 is completely located inside the rotor housing 63 and is fixedly connected to the rotor housing 63, and the permanent magnet rotor 61 is a radially magnetized annular permanent magnet or multiple permanent magnets evenly arranged around the circumference.

[0038] More preferably, the blades 62 and the rotor housing 63 are made of corrosion-resistant plastic.

[0039] Preferably, the rotor 6 further includes blades 62, the upper end of the rotor housing 63 is fixedly connected to the blades 62, and the blades 62 are located inside the upper pump housing 70.

[0040] More preferably, the blades 62 are arranged evenly in a circle around the axis of the rotor 6.

[0041] Preferably, the rotor housing 63 has an axially penetrating rotor housing through hole 60 in the middle. 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 rotor 6 to the fluid entering through the inlet 71 and prevent the rotor 6 from being unstable due to fluid impact.

[0042] Preferably, a cone 73 with its apex pointing downwards is formed on the upper inner wall of the second inner cavity 75, and the cone 73 and the through hole of the inlet 71 are located on the same axis. The cone 73 is used to guide the fluid entering through the inlet 71 to reduce the turbulence caused by the fluid directly scouring the inner wall of the pump casing 7, which affects the stability of the rotor 6.

[0043] Preferably, the inlet 71 is formed with external or internal threads. The inlet 71 is fixed to the pipe joint by a threaded connection, and the connection structure occupies a small radial space.

[0044] Example 2:

[0045] like Figures 1 to 10 As shown, a miniaturized centrifugal pump using the pump head described in Embodiment 1 includes: a stator assembly, a lower pump housing 76 inserted into the stator assembly, the stator assembly being located radially outside the permanent magnet rotor 61, the stator assembly driving the permanent magnet rotor 61 to levitate and rotate via magnetic force, i.e., the miniaturized centrifugal pump is a magnetic levitation pump.

[0046] Preferably, the stator assembly includes a magnetic yoke 1, a coil 2, and a housing 5. The magnetic yoke 1 is located inside the housing 5 and fixed in position to the housing 5. The coil 2 is wound around the outside of the magnetic yoke 1. The housing 5 has an axially penetrating housing hole 50. The pump housing 7 is fixedly connected to the housing 5, and the lower pump housing 76 is inserted into the housing hole 50. Figure 7 and Figure 9 As shown, the inlet 71 of the centrifugal pump faces downward, i.e. towards the stator assembly. Compared to the existing magnetic levitation bearingless pumps whose inlets face upward, i.e. away from the stator assembly, the inlet 71 of this device does not occupy additional axial space. Instead, it utilizes the space inside the stator assembly where there was originally no equipment, thereby reducing the overall axial length of the centrifugal pump.

[0047] Preferably, the inlet 71 is located entirely inside the housing bore 50. The inlet 71 does not extend downwards out of the housing bore 50, thus not occupying any axial space outside the stator assembly. Simultaneously, the pipe fitting fixed and connected to the inlet 71 can extend partially into the housing bore 50, further reducing the overall axial length of the device and the pipe fitting after connection, and further reducing the axial space occupied by the installed equipment.

[0048] Preferably, the wall thickness of the inlet 71 is greater than the wall thickness of the lower pump housing 76, and the wall thickness of the lower pump housing 76 is as small as possible to reduce the magnetic circuit gap between the magnetic yoke 1 and the permanent magnet rotor 61, thereby increasing the output power of the rotor 6; a groove 711 is formed on the outer side of the inlet 71, and a protrusion 511 is formed on the inner wall of the housing hole 50. The protrusion 511 is inserted into the groove 711 to restrict the rotation of the inlet 71 relative to the housing 5, and to prevent 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 lower pump housing 76 will cause the lower pump housing 76 with a smaller wall thickness to deform.

[0049] Preferably, the magnetic yoke 1 includes an annular magnetic yoke 11 and axial arms 12. Multiple coils 2 are wound around the outside of the annular magnetic yoke 11, and the multiple axial arms 12 are evenly arranged circumferentially along the annular magnetic yoke 11. The axial arms 12 are in contact with the annular magnetic yoke 11 and are fixed in position. At least one coil 2 is between two adjacent axial arms 12. The axial direction of the coils 2 is distributed along the circumference of the annular magnetic yoke 11, such as... Figure 8 As shown. Figure 7 As shown, the thickness of coil 2 is located in both the axial and radial directions of the stator assembly. Figure 7 and Figure 8 As shown, since the sum of the thicknesses of the coil 2 on the upper and lower sides of the annular magnetic yoke 11 is less than the axial length of the coil 2, the occupancy of the coil 2 on the axial space of the stator assembly is reduced, resulting in a smaller axial length of the stator assembly.

[0050] It should be noted that the axial length of coil 2 in this application is the arc length of the portion of the annular yoke 11 it occupies.

[0051] More preferably, the axial length of the coil 2 is greater than twice the thickness of the coil 2.

[0052] Preferably, the axial arm 12 includes a radial portion 121 and an axial portion 122. One end of the axial portion 122 is fixedly connected to the annular magnetic yoke 11, and the other end is integrally formed with the radial portion 121. The radial portion 121 extends toward the permanent magnet rotor 61 to minimize the magnetic circuit gap between the radial portion 121 and the permanent magnet rotor 61.

[0053] Preferably, the stator assembly further includes a displacement sensor 41, which is mounted in the sensor bracket 4 and is located on the same plane as the upper end of the axial arm 12.

[0054] More preferably, the housing 5 includes a first housing 51 and a second housing 52, which are fixedly and detachably connected.

[0055] Working principle:

[0056] The central space enclosed by the inverted L-shaped axial arms 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 inside the rotor housing 63, and the motor drives the rotor 6 to achieve frictionless rotation through magnetic force. At the same time, displacement sensors 41 are evenly distributed in a ring around the rotor 6 to detect the real-time offset of the rotor 6.

[0057] The present invention has been described above by way of example, but the present invention is not limited to the specific embodiments described above. Any modifications or variations made based on the present invention shall fall within the scope of protection claimed by the present invention.

Claims

1. A pump head, characterized in that Comprise: The rotor (6) and the pump shell (7), the rotor (6) is located inside the pump shell (7), the pump shell (7) includes upper pump shell (70), inlet (71), outlet (72) and lower pump shell (76), the lower end of the upper pump shell (70) is fixedly connected with the lower pump shell (76), the upper pump shell (70) is formed with second inner cavity (75), the lower pump shell (76) is formed with first inner cavity (74), the upper end of the first inner cavity (74) is communicated with the second inner cavity (75), the lower end of the lower pump shell (76) is formed with the inlet (71) communicated with the first inner cavity (74), the side of the upper pump shell (70) is formed with the outlet (72) communicated with the second inner cavity (75), the rotor (6) includes permanent magnet rotor (61), the permanent magnet rotor (61) is located inside the lower pump shell (76).

2. A pump head as claimed in claim 1, characterised in that: The rotor (6) further comprises a rotor housing (63), the axis of the rotor (6) is upward and downward direction, the permanent magnet rotor (61) is completely located inside the rotor housing (63) and is fixedly connected with the rotor housing (63), the permanent magnet rotor (61) is a radial magnetization annular permanent magnet or a plurality of permanent magnet circumferentially uniform arrangement.

3. A pump head as claimed in claim 2, wherein: The rotor (6) further comprises a blade (62), the upper end of the rotor housing (63) is fixedly connected with the blade (62), and the blade (62) is located inside the upper pump shell (70).

4. A pump head as claimed in claim 2, wherein: The middle part of the rotor housing (63) is formed with a rotor housing through hole (60) which is axially through, the rotor housing through hole (60) and the through hole of the inlet (71) are located on the same axis, and the diameter of the rotor housing through hole (60) is greater than the diameter of the through hole of the inlet (71).

5. A pump head as claimed in claim 4, wherein: The upper side inner wall of the second inner cavity (75) is formed with a cone (73) with a downward top end, and the cone (73) and the through hole of the inlet (71) are located on the same axis.

6. The pump head of claim 1, wherein: The inlet (71) is formed with external threads or internal threads.

7. A miniaturized centrifugal pump using the pump head according to any one of claims 1 to 6, characterized in that Comprise: The stator assembly, the lower pump shell (76) is inserted into the stator assembly, the stator assembly is located on the radial outer side of the permanent magnet rotor (61), and the stator assembly drives the permanent magnet rotor (61) to make the rotor (6) float and rotate by magnetic force.

8. A miniaturized centrifugal pump according to claim 7, characterized in that: The stator assembly comprises a magnetic yoke (1), a coil (2) and a machine shell (5), the magnetic yoke (1) is located inside the machine shell (5) and is fixedly positioned with the machine shell (5), the coil (2) is wound outside the magnetic yoke (1), the machine shell (5) is formed with a machine shell hole (50) which is axially through, the pump shell (7) is fixedly connected with the machine shell (5), and the lower pump shell (76) is inserted into the machine shell hole (50).

9. A miniaturized centrifugal pump according to claim 8, characterized in that: The inlet (71) is completely located inside the machine shell hole (50).

10. A miniaturized centrifugal pump according to claim 8, characterized in that: The wall thickness of the inlet (71) is greater than the wall thickness of the lower pump shell (76), the outer side of the inlet (71) is formed with a groove (711), the inner wall of the machine shell hole (50) is formed with a protrusion (511), the protrusion (511) is inserted into the groove (711) to limit the rotation of the inlet (71) relative to the machine shell (5).

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