Shielding type spherical rotor pump

Abstract

The invention relates to the field of pumps, in particular to a shielding type spherical rotor pump which comprises a spherical pump head coaxial with a pump shell, and a spherical rotor assembly in the spherical pump head is driven by a pump shaft to rotate so as to convey media. A rotor assembly coaxial with the pump shaft and a stator assembly arranged on the outer ring of the rotor assembly are arranged in the pump shell, and the stator assembly and the rotor assembly are matched in an electromagnetic induction mode to drive the pump shaft to rotate. A ball head gap flow channel communicated with a pump head inlet exists between the spherical rotor assembly and a shell cavity of the spherical pump head, a pump shaft circulating flow channel penetrating through the pump shaft is formed in the pump shaft in the axial direction, an annular overflowing gap flow channel exists between the rotor assembly and the stator assembly, and a circulating outlet flow channel communicated with the pump head inlet is further formed in the pump shell. The ball head gap flow channel, the pump shaft circulation flow channel, the overflowing gap flow channel and the circulation outlet flow channel are sequentially communicated to form a medium circulation cooling channel. The spherical rotor pump can adapt to high-pressure working conditions.

Description

Technical Field

[0001] The invention relates to the field of pumps, in particular to a shielded spherical rotor pump. Background Art

[0002] The spherical rotor pump is a positive displacement pump with a spherical rotor, a simple and compact structure, and high reliability. It has been widely used in the field of fluid transportation. Its structure is described in the announcement number "CN220204118U", including an active rotor and a driven rotor, and a plurality of variable-volume cavities are formed between the first mating surface of the active rotor and the second mating surface of the driven rotor. When the active rotor drives the driven rotor to rotate, the volume of the variable-volume cavities changes regularly between 0 and N (N is a positive number greater than 0), thereby completing the function of transporting liquid.

[0003] In this process, the gap between the rotor and the pump housing and the fit between the rotor and the seal are crucial. Under high pressure, these gaps and fits may be squeezed, causing leakage or damage, thus affecting the performance and life of the pump. During the delivery process, since there is a gap between the rotor and the pump housing, under high pressure, these gaps may be squeezed, causing leakage or damage, thus affecting the performance and life of the pump; therefore, the current spherical rotor pump can only provide stable and continuous liquid delivery under low pressure conditions (such as below 2.5Mpa), and the application environment is limited. Summary of the invention

[0004] In order to avoid and overcome the technical problems existing in the prior art, the present invention provides a shielded spherical rotor pump, which enables the spherical rotor pump to be used in high-pressure working conditions.

[0005] To achieve the above object, the present invention provides the following technical solutions:

[0006] A shielded spherical rotor pump comprises a spherical pump head coaxially arranged with a pump housing, wherein a spherical rotor assembly in the spherical pump head is driven by a pump shaft to rotate to convey a medium; a rotor assembly coaxially arranged with the pump shaft and a stator assembly arranged on the outer ring of the rotor assembly are arranged in the pump housing, and the stator assembly cooperates with the rotor assembly by electromagnetic induction to drive the pump shaft to rotate;

[0007] There is a ball head gap flow channel connected to the pump head inlet between the spherical rotor assembly and the shell cavity of the spherical pump head, a pump shaft circulation flow channel penetrating the pump shaft is axially opened on the pump shaft, an annular flow gap flow channel is provided between the rotor assembly and the stator assembly, and a circulation outlet flow channel connected to the pump head inlet is also provided on the pump housing, and the ball head gap flow channel, the pump shaft circulation flow channel, the flow gap flow channel and the circulation outlet flow channel are sequentially connected to form a medium circulation cooling channel;

[0008] In order to ensure the continuous circulation of the circulating medium, the minimum pressure difference of the medium circulation cooling channel is ΔP. ​​The minimum length of the circulation outlet flow channel is calculated based on ΔP.

[0009] ΔP=ΔP1+ΔP2+ΔP3;

[0010]

[0011] Q L It is the circulating liquid flow rate in the medium circulation cooling channel;

[0012] u1 is the medium flow velocity in the pump shaft circulation channel;

[0013] u2 is the medium flow rate in the circulation outlet flow channel;

[0014] d1 is the diameter of the pump shaft circulation channel;

[0015] d2 is the diameter of the circulation outlet flow channel;

[0016] ΔP1 is the pressure difference before and after the pump shaft circulation channel;

[0017] ΔP2 is the pressure difference before and after the circulation outlet flow channel;

[0018] ΔP3 is the pressure difference before and after the flow gap flow channel;

[0019] λ is the flow resistance coefficient of the circulating medium;

[0020] ρ is the density of the circulating medium;

[0021] L1 is the length of the pump shaft circulation channel;

[0022] L2 is the length of the circulation outlet flow channel;

[0023] L3 is the length of the flow gap flow channel;

[0024] r is the gap width of the flow gap channel;

[0025] μ is the dynamic viscosity of the circulating medium.

[0026] As a further solution of the present invention: a bearing assembly is arranged in the pump cavity of the pump housing, which is located at both ends of the pump shaft and supports the pump shaft in both directions. The inner ring of the bearing of the bearing assembly is provided with a spiral liquid flow groove along the axial direction for medium to pass through; the bearing of the bearing assembly at one end of the adjacent spherical pump head is the proximal bearing, and the bearing of the bearing assembly far away from the spherical pump head is the distal bearing; the medium is divided after passing through the ball head gap flow channel, and a part of the medium enters the circulation outlet flow channel after passing through the pump shaft circulation flow channel, the liquid flow groove of the distal bearing, and the flow gap flow channel in turn, and the other part of the medium enters the circulation outlet flow channel after passing through the liquid flow groove of the proximal bearing.

[0027] As a further solution of the present invention: a thrust plate is arranged between the shoulder of the pump shaft and the bearing of the bearing assembly, the thrust plate abuts against the shoulder of the pump shaft to withstand the axial thrust of the pump shaft, and a groove is opened on the surface of the thrust plate for the medium passing through the liquid tank outlet of the bearing to pass through.

[0028] As a further solution of the present invention: the pump casing is a cylindrical structure with openings at both ends, and a front flange and a rear flange are respectively provided at the openings at both ends of the pump casing, a stator shielding sleeve is installed between the front flange and the rear flange, and an annular sealed space is enclosed between the front flange, the rear flange, the pump casing and the stator shielding sleeve for stator installation.

[0029] As a further solution of the present invention: the stator and the winding assembly are coaxially arranged, and an electrical interface is arranged on the pump housing to connect the stator circuit externally.

[0030] As a further solution of the present invention: the sealing cavity of the stator assembly is filled with epoxy resin for sealing.

[0031] As a further solution of the present invention: end plates are coaxially arranged at both ends of the pump shaft, a rotor shielding sleeve is arranged between the two end plates, and the two end plates, the rotor shielding sleeve and the pump shaft form an annular sealed space for rotor installation; there is a gap between the rotor shielding sleeve and the stator shielding sleeve to form a flow gap flow channel.

[0032] As a further solution of the present invention: a hydraulic base is coaxially arranged on the front flange, the spherical pump head is fixed on the hydraulic base, a sliding sleeve is installed in the hydraulic base, the pump shaft is coaxially fixed to the spherical rotor assembly through the sliding sleeve, and the sliding sleeve is coaxially rotatably matched with the seat body of the spherical pump head through a bearing.

[0033] As a further solution of the present invention: the pump shaft and the sliding sleeve are coated with a diamond film.

[0034] Compared with the prior art, the present invention has the following beneficial effects:

[0035] 1. The present invention combines a canned motor with a spherical rotor pump. By opening a medium circulation cooling channel in the pump body, under high-pressure conditions, the medium in the gap between the rotor and the pump casing can flow back to the pump head inlet through the medium circulation cooling channel, thereby avoiding leakage of the medium from the gap between the rotor and the pump casing. Under high-pressure conditions, the performance and life of the pump will not be affected, thereby expanding the application scope of the spherical rotor pump.

[0036] 2. The present invention calculates the length of each flow channel according to the minimum pressure difference required to establish the circulation, and selects the most suitable flow channel length according to different operating conditions, so that the rotor pump meets the self-circulation cooling conditions.

[0037] 3. The present invention grooves the inner ring of the bearing and the thrust plate to guide the medium flowing out of the pump shaft into the flow gap between the rotor assembly and the stator assembly; epoxy resin glue is poured into the enclosed space through the electrical interface for sealing, thereby ensuring the pressure bearing capacity of the stator assembly and playing a certain heat dissipation role.

[0038] 4. The present invention implements the spherical rotor pump in the form of a shielded pump, and the ultra-high head characteristic can be applied to fields where traditional pumps cannot be used; the overall size of the pump is shortened by integrating the hydraulic components and motor components of the pump and using internal circulating fluid for cooling and lubrication; the components are connected by bolt connection or laser welding, and O-type rubber rings are used for static sealing inside, which improves the reliability of sealing under high pressure and high vibration conditions. The integrated design makes the outside of the pump have no important components, and the outer surface of the pump can be processed to adapt to special use environments. BRIEF DESCRIPTION OF THE DRAWINGS

[0039] Figure 1 It is a schematic diagram of the structure of the present invention.

[0040] In the figure:

[0041] 1. Pump casing; 11. Front flange; 12. Rear flange; 13. Bearing seat; 14. Hydraulic base;

[0042] 2. stator assembly; 21. stator; 22. winding assembly;

[0043] 23. Stator shielding sleeve; 24. Electrical interface;

[0044] 3. rotor assembly; 31. end plate; 32. rotor; 33. rotor shielding sleeve;

[0045] 4. Pump shaft; 41. Bearing assembly; 42. Thrust plate; 43. Sliding sleeve;

[0046] 5. Spherical pump head; 51. Spherical rotor assembly; 52. Pump head inlet; 53. Pump head outlet;

[0047] 61. Ball head clearance flow channel; 62. Pump shaft circulation flow channel; 63. First bearing clearance flow channel;

[0048] 64. Flow-through gap flow channel; 65. Second bearing gap flow channel; 66. Circulation outlet flow channel. DETAILED DESCRIPTION

[0049] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0050] See also Figure 1 In an embodiment of the present invention, a shielded spherical rotor pump is provided, wherein the hydraulic component is a spherical pump head 5 , and a shielded motor component is arranged in the pump housing 1 .

[0051] The spherical pump head 5 is a prior art, and its structure is briefly described below. A spherical rotor assembly 51 is arranged in its mounting seat, and the spherical rotor assembly 51 includes an upper hemisphere and a lower hemisphere, which are coaxially connected and arranged in the spherical cavity of the spherical pump head 5. The upper hemisphere and the lower hemisphere are connected by a pin shaft and perform periodic opening and closing movements. A boss is arranged on the upper hemisphere, and the spherical pump head 5 is provided with a groove matching the boss, so that the upper hemisphere can be plugged in and matched. The central axis of the boss is eccentric to the central axis of the lower hemisphere at a certain degree, and there is an angle between the plane of the lower hemisphere and the plane of the upper hemisphere, and a periodically changing working cavity is formed by the angle. The slider of the lower hemisphere is arranged in the groove of the sliding sleeve 43, and is connected to the pump shaft 4 through the sliding sleeve 43. The lower hemisphere is driven to rotate by the pump shaft 4. When the lower hemisphere makes a circular motion with the pump shaft at an angular velocity of ω, the angle between the working chambers of the two hemispheres changes periodically, which plays a role in liquid suction and discharge; thereby, the medium is sucked from the pump head inlet 52 of the spherical pump head 5, and the medium is discharged through the pump head outlet 53 after passing through the cavity of the spherical rotor assembly 51.

[0052] The motor assembly includes a pump housing 1, a stator assembly 2 and a rotor assembly 3 located in the pump housing 1. The front and rear ends of the pump housing 1 are respectively provided with a front flange 11 and a rear flange 12, and a stator shielding sleeve 23 is sealed and connected between the front flange 11 and the rear flange 12. The front flange 11, the rear flange 12, the pump housing 1 and the stator shielding sleeve 23 enclose a sealed space, and are laser welded to each other to ensure the airtightness of the enclosed space and facilitate the installation of the stator 21. The winding assembly 22 of the stator 21 is arranged in the sealed space and fixed to the pump housing 1 by interference fit. An electrical interface 24 is provided on the pump housing 1, and the stator circuit extends to the outside of the pump housing 1 through the electrical interface 24. Epoxy resin glue is poured into the enclosed space through the electrical interface 24 for sealing, so as to ensure the pressure bearing capacity of the stator assembly 2 and play a certain heat dissipation role.

[0053] The rotor assembly 3 is coaxially arranged on the inner ring of the stator assembly 2 and coaxially arranged with the pump shaft 4. The pump shaft 4 is coaxially provided with end plates 31 at both ends, and a magnetic rotor 32 is arranged between the two end plates 31. The rotor shield 33 is preferably connected to the two end plates 31 by laser welding, so as to enclose the pump shaft 4 to form a sealed cavity for the installation of the rotor 32. An annular flow gap flow channel 64 is formed between the rotor assembly 3 and the stator assembly 2.

[0054] A bearing seat 13 is coaxially arranged on the rear flange 12, and a hydraulic base 14 is coaxially arranged on the front flange 11. Bearing assemblies 41 are arranged in the bearing seat 13 and the hydraulic base 14, and the two bearing assemblies 41 form a bidirectional support for the pump shaft 4. The bearings of the two bearing assemblies 41 are both in contact with the shoulders of the pump shaft 4 through the thrust plate 42, and the pump shaft 4 is clamped by the thrust plate 42. After the stator assembly 2 is energized, the rotor assembly 3 is driven to rotate by electromagnetic force. The radial force during the operation of the pump is borne by the bearings of the two bearing assemblies 41, and the thrust plate 42 is used to bear the axial force generated when the pump shaft 4 is in operation. The spherical pump head 5 is connected to the hydraulic base 14 by bolts, and the sealing surface is sealed with an O-type rubber ring. Laser welding is used to ensure the reliability of the pump seal under high pressure and high vibration conditions.

[0055] The inner ring of the bearing assembly 41 is provided with a spiral liquid groove for medium to pass through from one side of the bearing to the other side of the bearing. The thrust plate 42 is also provided with a groove for communicating with the liquid groove on the bearing assembly 41 through the groove for medium to pass through.

[0056] There is a gap of 0.01-0.05mm between the upper hemisphere and the lower hemisphere of the spherical rotor assembly 51 and the spherical cavity of the spherical pump head 5, and the gap is the ball head gap flow channel 61. A sliding sleeve 43 is arranged in the hydraulic base 14, and the spherical rotor assembly 51 is coaxially arranged with the pump shaft 4 through the sliding sleeve 43, and the spherical rotor assembly 51 is clamped and positioned by the sliding sleeve 43. An axial hole is opened in the pump shaft 4 to form a pump shaft circulation flow channel 62, and there is a gap between the bearing assembly 41 at one end of the pump shaft 4 and the bearing seat 13 adjacent to the bearing seat 13 for the medium to pass through in reverse. A communicating circulation outlet flow channel 66 is opened on the hydraulic base 14 and the spherical pump head 5, and the circulation outlet flow channel 66 connects the pump head inlet 52 with the flow gap flow channel 64.

[0057] The bearing liquid groove of the bearing assembly 41 on the side of the adjacent bearing seat 13 forms a first bearing gap flow channel 63, and the bearing liquid groove of the bearing assembly 41 on the side of the adjacent spherical pump head 5 forms a second bearing gap flow channel 65. When the spherical pump head 5 conveys the medium, a part of the medium enters the ball head gap flow channel 61 to participate in the cooling work inside the pump body. A part of the medium in the ball head gap flow channel 61 passes through the pump shaft circulation flow channel 62, the first bearing gap flow channel 63, and the flow gap flow channel 64 in sequence, and then flows back to the pump head inlet 52 through the circulation outlet flow channel 66. Another part of the medium in the ball head gap flow channel 61 passes through the gap between the hydraulic base 14 and the sliding sleeve 43, enters the second bearing gap flow channel 65, and then merges with the medium flowing out of the flow gap flow channel 64, and then flows back to the pump head inlet 52 through the circulation outlet flow channel 66. The circulating high-pressure fluid cools the motor and lubricates the internal components of the pump body.

[0058] The pump shaft 4 and the sliding sleeve 43 are both coated with a diamond-like carbon film, which is conducive to maintaining good lubrication between the internal structures and ensuring the life of the pump; the bearing of the bearing assembly 41 is made of peek material or graphite material.

[0059] In order to ensure the continuous circulation of the circulating medium, the minimum pressure difference of the medium circulation cooling channel is ΔP. ​​Since the lengths of the pump shaft 4 and the rotor shielding sleeve and the stator shielding sleeve are mostly standardized, the minimum length of the circulation outlet flow channel 66 can be directly calculated based on ΔP. The circulation of the medium can be achieved when the minimum length is met.

[0060] Or in the circulation outlet flow channel 66, the appropriate pump shaft length and the lengths of the rotor shielding sleeve and the stator shielding sleeve are selected through calculation.

[0061] ΔP=ΔP1+ΔP2+ΔP3;

[0062]

[0063]

[0064] Q L is the circulating liquid flow rate in the medium circulation cooling channel; u1 is the medium flow rate in the pump shaft circulation channel 62;

[0065] u2 is the flow rate of the medium in the circulation outlet flow channel 66;

[0066] d1 is the diameter of the pump shaft circulation channel 62;

[0067] d2 is the diameter of the circulation outlet flow channel 66;

[0068] ΔP1 is the front and rear pressure difference of the pump shaft circulation channel 62;

[0069] ΔP2 is the pressure difference before and after the circulation outlet flow channel 66;

[0070] ΔP3 is the pressure difference before and after the flow gap flow channel 64;

[0071] λ is the flow resistance coefficient of the circulating medium;

[0072] ρ is the density of the circulating medium;

[0073] L1 is the length of the pump shaft circulation channel 62;

[0074] L2 is the length of the circulation outlet flow channel 66;

[0075] L3 is the length of the flow gap channel 64;

[0076] r is the gap width of the flow gap channel 64;

[0077] μ is the dynamic viscosity of the circulating medium;

[0078] During the medium circulation process, the following conditions must be met:

[0079] R3>>R1+R2;

[0080] The flow resistance of the pump shaft circulation channel 62 is R1;

[0081] The flow resistance of the circulation outlet flow channel 66 is R2;

[0082] The flow resistance of the flow gap flow channel 64 is R3;

[0083]

[0084] The basic principles of the present application are described above in conjunction with specific embodiments. However, it should be noted that the advantages, strengths, effects, etc. mentioned in the present application are only examples and not limitations, and it cannot be considered that these advantages, strengths, effects, etc. are required by each embodiment of the present application. In addition, the specific details disclosed above are only for the purpose of illustration and ease of understanding, not for limitation, and the above details do not limit the present application to being implemented by adopting the above specific details.

[0085] The block diagrams of the devices, apparatuses, equipment, and systems involved in this application are only illustrative examples and are not intended to require or imply that they must be connected, arranged, and configured in the manner shown in the block diagram. As will be appreciated by those skilled in the art, these devices, apparatuses, equipment, and systems can be connected, arranged, and configured in any manner. Words such as "including", "comprising", "having", etc. are open words, referring to "including but not limited to", and can be used interchangeably with them. The words "or" and "and" used here refer to the words "and / or" and can be used interchangeably with them, unless the context clearly indicates otherwise. The words "such as" used here refer to the phrase "such as but not limited to", and can be used interchangeably with them.

Claims

1. A shielded spherical rotor pump, characterized in that: The pump comprises a spherical pump head (5) coaxially arranged with a pump housing (1), wherein a spherical rotor assembly (51) in the spherical pump head (5) is driven by a pump shaft (4) to rotate so as to convey a medium; a rotor assembly (3) coaxially arranged with the pump shaft (4) and a stator assembly (2) arranged on the outer ring of the rotor assembly (3) are arranged in the pump housing (1), and the stator assembly (2) cooperates with the rotor assembly (3) by electromagnetic induction to drive the pump shaft (4) to rotate; A ball head gap flow channel (61) communicating with a pump head inlet (52) is provided between the spherical rotor assembly (51) and the shell cavity of the spherical pump head (5); a pump shaft circulation flow channel (62) penetrating the pump shaft (4) is provided on the pump shaft (4) along the axial direction; an annular flow gap flow channel (64) is provided between the rotor assembly (3) and the stator assembly (2); a circulation outlet flow channel (66) communicating with the pump head inlet (52) is also provided on the pump housing (1); the ball head gap flow channel (61), the pump shaft circulation flow channel (62), the flow gap flow channel (64) and the circulation outlet flow channel (66) are connected in sequence to form a medium circulation cooling channel; In order to ensure continuous circulation of the circulating medium, the minimum pressure difference of the medium circulation cooling channel is ΔP, and the minimum length of the circulation outlet flow channel (66) is calculated according to ΔP; ΔP=ΔP1+ΔP2+ΔP3; Q L It is the circulating liquid flow rate in the medium circulation cooling channel; u1 is the flow rate of the medium in the pump shaft circulation channel (62); u2 is the flow rate of the medium in the circulation outlet flow channel (66); d1 is the diameter of the pump shaft circulation channel (62); d2 is the diameter of the circulation outlet flow channel (66); ΔP1 is the pressure difference before and after the pump shaft circulation channel (62); ΔP2 is the pressure difference before and after the circulation outlet flow channel (66); ΔP3 is the pressure difference before and after the flow gap flow channel (64); λ is the flow resistance coefficient of the circulating medium; ρ is the density of the circulating medium; L1 is the length of the pump shaft circulation channel (62); L2 is the length of the circulation outlet flow channel (66); L3 is the length of the flow gap channel (64); r is the gap width of the flow gap channel (64); μ is the dynamic viscosity of the circulating medium.

2. A shielded spherical rotor pump according to claim 1, characterized in that: A bearing assembly (41) is arranged in the pump chamber of the pump housing (1) and is located at both ends of the pump shaft (4) and supports the pump shaft (4) in both directions. The inner ring of the bearing of the bearing assembly (41) is provided with a spiral liquid flow groove along the axial direction for medium to pass through. The bearing of the bearing assembly (41) at one end of the adjacent spherical pump head (5) is the proximal bearing, and the bearing of the bearing assembly (41) at the end away from the spherical pump head (5) is the distal bearing. The medium is divided after passing through the ball head gap flow channel (61). A part of the medium passes through the pump shaft circulation flow channel (62), the liquid flow groove of the distal bearing, and the flow gap flow channel (64) in sequence and then enters the circulation outlet flow channel (66), and the other part of the medium passes through the liquid flow groove of the proximal bearing and then enters the circulation outlet flow channel (66).

3. A shielded spherical rotor pump according to claim 2, characterized in that: A thrust plate (42) is arranged between the shaft shoulder of the pump shaft (4) and the bearing of the bearing assembly (41); the thrust plate (42) abuts against the shaft shoulder of the pump shaft (4) to bear the axial thrust of the pump shaft (4); a groove is provided on the surface of the thrust plate (42) for the medium passing through the outlet of the bearing liquid tank to pass through.

4. A shielded spherical rotor pump according to any one of claims 1 to 3, characterized in that: The pump casing (1) is of a cylindrical structure with openings at both ends. A front flange (11) and a rear flange (12) are respectively arranged at the openings at both ends of the pump casing (1). A stator shielding sleeve (23) is installed between the front flange (11) and the rear flange (12). The front flange (11), the rear flange (12), the pump casing (1) and the stator shielding sleeve (23) enclose an annular sealed space for installing the stator (21).

5. A shielded spherical rotor pump according to claim 4, characterized in that: The stator (21) and the winding assembly (22) are coaxially arranged, and an electrical interface (24) is arranged on the pump housing (1) to connect the stator circuit externally.

6. A shielded spherical rotor pump according to claim 4, characterized in that: The sealing cavity of the stator assembly (2) is filled with epoxy resin for sealing.

7. A shielded spherical rotor pump according to claim 4, characterized in that: End plates (31) are coaxially arranged at both ends of the pump shaft (4), a rotor shielding sleeve (33) is arranged between the two end plates (31), and the two end plates (31), the rotor shielding sleeve (33) and the pump shaft (4) enclose an annular sealed space for installing the rotor (32); a gap exists between the rotor shielding sleeve (33) and the stator shielding sleeve (23) to form a flow gap flow channel (64).

8. A shielded spherical rotor pump according to claim 4, characterized in that: A hydraulic base (14) is coaxially arranged on the front flange (11), the spherical pump head (5) is fixed on the hydraulic base (14), a sliding sleeve (43) is installed in the hydraulic base (14), the pump shaft (4) is coaxially fixed with the spherical rotor assembly (51) through the sliding sleeve (32), and the sliding sleeve (43) is coaxially rotatably matched with the seat body of the spherical pump head (5) through a bearing.

9. A shielded spherical rotor pump according to claim 8, characterized in that: The pump shaft (4) and the sliding sleeve (43) are both coated with a diamond film.

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