Spherical rotor pump

Abstract

The utility model relates to the field of pumps, in particular to a 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 utility model relates to pump field, concretely is a kind of spherical rotor pump. BACKGROUND

[0002] Spherical rotor pump is a positive displacement pump, rotor is spherical, simple structure and compact, high reliability, has been widely applied in fluid delivery field.Its structure is as described in the announcement number "CN220204118U", including driving rotor and driven rotor, the first mating surface of driving rotor and the second mating surface of driven rotor form multiple variable volume chambers, when driving rotor drives driven rotor to rotate, the volume of variable volume chamber changes regularly between 0 and N (N is positive number greater than 0), to complete the function of transporting liquid.

[0003] In this process, the gap between rotor and pump shell and the cooperation between rotor and sealing element are crucial.In high pressure environment, these gaps and cooperation can be extruded, resulting in leakage or damage, thereby affecting the performance and life of pump.In the process of delivery, due to the gap between rotor and pump shell in this process, these gaps can be extruded in high pressure environment, resulting in leakage or damage, thereby affecting the performance and life of pump;Therefore, the spherical rotor pump can only provide stable and continuous liquid delivery under low pressure working condition (such as 2.5Mpa below), and the application environment is limited. UTILITY MODEL CONTENT

[0004] In order to avoid and overcome the technical problems existing in the prior art, the utility model provides a kind of spherical rotor pump.The utility model makes spherical rotor pump can adapt to high pressure working condition.

[0005] To achieve the above object, the utility model provides the following technical scheme:

[0006] A kind of spherical rotor pump, including the coaxial arrangement of spherical pump head with pump shell, the spherical rotor assembly in spherical pump head is driven to rotate by pump shaft to transport medium;Pump shell is provided with the rotor assembly and the stator assembly arranged in the outer circle of rotor assembly with pump shaft coaxial arrangement, stator assembly and rotor assembly electromagnetic induction cooperation to drive pump shaft rotation;

[0007] Spherical rotor assembly and the shell cavity of spherical pump head exist with pump head inlet communication ball head gap flow channel, pump shaft is provided with the pump shaft circulation flow channel that penetrates pump shaft along axial direction, annular flow gap flow channel exists between rotor assembly and stator assembly, circulation outlet flow channel is also provided on pump shell with pump head inlet communication, ball head gap flow channel, pump shaft circulation flow channel, flow gap flow channel and circulation outlet flow channel are sequentially communicated to constitute medium circulation cooling channel.

[0008] As a further scheme of the utility model: the pump cavity of the pump shell is provided with bearing assembly located at both ends of the pump shaft and bidirectional supporting the pump shaft, the bearing inner ring of the bearing assembly is provided with spiral liquid passage for medium passing along the axial direction; the bearing of the bearing assembly at one end of the adjacent spherical pump head is proximal bearing, and the bearing of the bearing assembly away from one end of the spherical pump head is distal bearing; after the medium passes through the spherical head gap flow channel, the medium is divided, and a part of the medium sequentially passes through the pump shaft circulation flow channel, the liquid passage of the distal bearing, and the overflow gap flow channel to enter the circulation outlet flow channel, and the other part of the medium passes through the liquid passage of the proximal bearing to enter the circulation outlet flow channel.

[0009] As a further scheme of the utility model: the shaft shoulder of the pump shaft and the bearing of the bearing assembly are provided with thrust disc, the thrust disc and the shaft shoulder of the pump shaft abut to bear the axial thrust of the pump shaft, and the disc surface of the thrust disc is provided with groove for the medium of the bearing liquid passage outlet to pass.

[0010] As a further scheme of the utility model: the pump shell is in the tubular structure with both ends being open, the openings of both ends of the pump shell are respectively provided with front flange and rear flange, the stator shield sleeve is installed between the front flange and the rear flange, and the front flange, the rear flange, the pump shell and the stator shield sleeve surround to form annular sealing space for installing the stator.

[0011] As a further scheme of the utility model: the stator and the winding assembly are coaxially arranged, and the pump shell is provided with electrical interface for connecting the stator circuit.

[0012] As a further scheme of the utility model: the sealing cavity of the stator assembly is filled with epoxy resin seal.

[0013] As a further scheme of the utility model: the both ends of the pump shaft are coaxially provided with end plates, the rotor shield sleeve is arranged between the two end plates, and the two end plates, the rotor shield sleeve and the pump shaft surround to form annular sealing space for installing the rotor; the gap exists between the rotor shield sleeve and the stator shield sleeve to form the overflow gap flow channel.

[0014] As a further scheme of the utility model: the hydraulic base is coaxially arranged on the front flange, the spherical pump head is fixed on the hydraulic base, the sliding sleeve is installed in the hydraulic base, the pump shaft is coaxially fixed with the spherical rotor assembly through the sliding sleeve, and the sliding sleeve is coaxially rotary matched with the seat body of the spherical pump head through the bearing.

[0015] As a further scheme of the utility model: the bearings of the two bearing assemblies are made of peek material or graphite material.

[0016] Compared with the prior art, the utility model has the advantages that:

[0017] 1. The utility model discloses a shielding motor and spherical rotor pump are combined, through the medium circulation cooling channel of setting up in the pump body, under high pressure working condition, the medium in the clearance between rotor and pump shell can flow back to the pump head entrance through the medium circulation cooling channel, avoid the leakage of medium from the clearance between rotor and pump shell, also can not influence the performance and life of pump under high pressure environment, expand the application scope of spherical rotor pump.

[0018] 2. The utility model discloses through the slotting on bearing inner race and thrust disc, thereby the medium of pump shaft export is introduced to the overflow gap between rotor assembly and stator assembly, through the sealing of the epoxy resin glue of filling in the airtight space through electrical interface, guarantee the pressure bearing capacity of stator assembly, and also play certain heat dissipation effect.

[0019] 3. The utility model discloses the spherical rotor pump is realized by shielding pump form, and the characteristic of superhigh lift can be applied in the field that traditional pump cannot apply, through the integration design of pump's hydraulic assembly and motor assembly, and adopt internal circulation liquid to cool and lubricate, shorten the overall size of pump.

[0020] 4. The utility model discloses the connection mode of each component is bolted connection or laser welding, and adopts O type rubber ring static seal in the inside, improved the reliability of sealing under high pressure, high vibration working condition, and the integration design makes the external of pump have no important component, can handle the outer surface of pump, adapts special use environment. ACCURACY OF DRAWINGS

[0021] Figure 1 It is the structural schematic diagram of the utility model.

[0022] In the drawing:

[0023] 1, pump shell;11, front flange;12, rear flange;13, bearing seat;14, hydraulic base;

[0024] 2, stator assembly;21, stator;22, winding assembly;

[0025] 23, stator shield sleeve;24, electrical interface;

[0026] 3, rotor assembly;31, end plate;32, rotor;33, rotor shield sleeve;

[0027] 4, pump shaft;41, bearing assembly;42, thrust disc;43, sliding sleeve;

[0028] 5, spherical pump head;51, spherical rotor assembly;52, pump head entrance;53, pump head export;

[0029] 61, ball head clearance flow channel;62, pump shaft circulation flow channel;63, first bearing clearance flow channel;

[0030] 64. through-flow gap flow channel; 65. second bearing gap flow channel; 66. circulation outlet flow channel DETAILED DESCRIPTION

[0031] The technical solutions in the embodiments of the utility model will be clearly and completely described below with reference to the drawings in the embodiments of the utility model. Obviously, the described embodiments are only part of the embodiments of the utility model, rather than all the embodiments. Based on the embodiments in the utility model, all other embodiments obtained by those skilled in the art without creative labor belong to the protection scope of the utility model.

[0032] Please refer to Figure 1 In the embodiments of the utility model, a spherical rotor pump, the hydraulic assembly of which is a spherical pump head 5, is provided with a shielded motor assembly in the pump shell 1.

[0033] The spherical pump head 5 is a prior art, and its structure is described as follows. A spherical rotor assembly 51 is arranged in the mounting seat of the spherical pump head 5. The spherical rotor assembly 51 comprises an upper half-sphere and a lower half-sphere, which are coaxially connected and arranged in the spherical cavity of the spherical pump head 5. The upper half-sphere and the lower half-sphere are connected by a pin shaft and perform periodic opening and closing movement. A boss is arranged on the upper half-sphere, and the spherical pump head 5 is provided with a groove matched with the boss, so as to provide plug-in cooperation for the upper half-sphere. The central axis of the boss is eccentric to the central axis of the lower half-sphere by a certain degree of eccentric angle, and the plane of the lower half-sphere is at an angle to the plane of the upper half-sphere, so that a periodically changing working cavity is formed through the angle. The slider of the lower half-sphere is arranged in the groove of the sliding sleeve 43, which is connected with the pump shaft 4 through the sliding sleeve 43, and the lower half-sphere is driven to rotate by the pump shaft 4. When the lower half-sphere performs circular motion with an angular velocity of ω, the angle of the working cavity of the two half-spheres changes periodically, thereby playing a role of pumping and discharging liquid. Thus, the medium is sucked into the spherical pump head 5 from the pump head inlet 52, and the medium is discharged from the pump head outlet 53 after passing through the cavity of the spherical rotor assembly 51.

[0034] The motor assembly comprises a pump shell 1, a stator assembly 2 and a rotor assembly 3 arranged in the pump shell 1. The front flange 11 and the rear flange 12 are arranged at the front and rear ends of the pump shell 1 respectively, and the stator shield sleeve 23 is sealingly connected between the front flange 11 and the rear flange 12. The front flange 11, the rear flange 12, the pump shell 1 and the stator shield sleeve 23 form a sealed space and are laser-welded to each other to ensure the airtightness of the sealed space and facilitate the installation of the stator 21. The winding assembly 22 of the stator 21 is arranged in the sealed space and is fixed to the pump shell 1 by interference fit. The electrical interface 24 is arranged on the pump shell 1, the stator circuit extends to the outside of the pump shell 1 through the electrical interface 24, and the stator circuit is sealed by pouring epoxy resin glue into the sealed space through the electrical interface 24, so as to ensure the pressure-bearing capacity of the stator assembly 2 and play a certain heat dissipation role.

[0035] The rotor assembly 3 is coaxially arranged in 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 the front and rear ends, and a magnetic rotor 32 is arranged between the two end plates 31. The rotor shield sleeve 33 is preferably connected between the two end plates 31 by laser welding, thereby enclosing a sealed cavity with the pump shaft 4 for installing the rotor 32. The rotor assembly 3 and the stator assembly 2 form an annular flow gap flow channel 64.

[0036] The bearing seat 13 is coaxially arranged on the rear flange 12, and the hydraulic base 14 is coaxially arranged on the front flange 11. The bearing assembly 41 is arranged in the bearing seat 13 and the hydraulic base 14. The two bearing assemblies 41 form bidirectional support for the pump shaft 4. The bearings of the two bearing assemblies 41 are in abutment with the shaft shoulder of the pump shaft 4 through the thrust disc 42, and the thrust disc 42 forms a clamping action on the pump shaft 4. After the stator assembly 2 is energized, the rotor assembly 3 is driven to rotate by electromagnetic force. The radial force during pump operation is borne by the bearings of the two bearing assemblies 41, and the thrust disc 42 is used to bear the axial force generated during the operation of the pump shaft 4. The spherical pump head 5 is connected to the hydraulic base 14 by bolts, and the sealing surface is sealed by an O-shaped rubber ring. Laser welding is used to ensure the reliability of the pump seal under high pressure and high vibration conditions.

[0037] The bearing inner ring of the bearing assembly 41 is provided with a spiral liquid passage for the medium to pass from one side of the bearing to the other side of the bearing through the liquid passage. The thrust disc 42 is also provided with a groove, which is in communication with the liquid passage on the bearing assembly 41 for the medium to pass through.

[0038] There is a gap of 0.01-0.05mm between the upper and lower hemispheres of the spherical rotor assembly 51 and the spherical cavity of the spherical pump head 5, which is the ball head gap flow channel 61. The hydraulic base 14 is provided with a sliding sleeve 43, 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. The pump shaft 4 is axially bored, thereby forming a pump shaft circulation flow channel 62. There is a gap between the pump shaft 4 and the bearing assembly 41 at one end of the adjacent bearing seat 13, which is used for the medium to pass through. The hydraulic base 14 and the spherical pump head 5 are provided with a communication circulation outlet flow channel 66, which communicates the pump head inlet 52 with the flow gap flow channel 64.

[0039] The bearing liquid passage of the bearing assembly 41 on one side of the adjacent bearing seat 13 constitutes a first bearing gap flow channel 63, and the bearing liquid passage of the bearing assembly 41 on one side of the adjacent spherical pump head 5 constitutes a second bearing gap flow channel 65. When the spherical pump head 5 conveys medium, a part of the medium enters the ball head gap flow channel 61 to participate in the cooling work inside the pump body. The part of the medium in the ball head gap flow channel 61 successively passes through the pump shaft circulation flow channel 62, the first bearing gap flow channel 63, the overflow gap flow channel 64, 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 flows back to the pump head inlet 52 through the circulation outlet flow channel 66 after converging with the medium flowing out of the overflow gap flow channel 64. Through the circulating flow of high-pressure fluid, the motor and the internal components of the pump are cooled and lubricated.

[0040] The pump shaft 4 and the sliding sleeve 43 are coated with a diamond-like film, which is beneficial to maintaining good lubrication between the internal structures and ensuring the service life of the pump; the bearings of the bearing assembly 41 are made of peek or graphite.

[0041] To meet 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 shield sleeve and the stator shield sleeve are mostly standard, the minimum length of the circulation outlet flow channel 66 can be directly calculated according to ΔP, and the circulation flow of the medium can be realized by meeting the minimum length.

[0042] Or in the circulation outlet flow channel 66, the appropriate lengths of the pump shaft and the rotor shield sleeve and the stator shield sleeve are selected by calculation.

[0043] ΔP = ΔP1 + ΔP2 + ΔP3;

[0044]

[0045]

[0046] Q L The circulation liquid flow rate in the medium circulation cooling channel;

[0047] u1 is the flow rate of the medium in the pump shaft circulation flow channel 62;

[0048] u2 is the flow rate of the medium in the circulation outlet flow channel 66;

[0049] d1 is the diameter of the pump shaft circulation flow channel 62;

[0050] d2 is the diameter of the circulation outlet flow channel 66;

[0051] ΔP1 is the pressure difference before and after the pump shaft circulation flow channel 62;

[0052] ΔP2 is the pressure difference between the front and back of the circulation outlet flow channel 66;

[0053] ΔP3 is the pressure difference between the front and back of the over-flow gap flow channel 64;

[0054] λ is the flow resistance coefficient of the circulation medium;

[0055] ρ is the density of the circulation medium;

[0056] L1 is the length of the pump shaft circulation flow channel 62;

[0057] L2 is the length of the circulation outlet flow channel 66;

[0058] L3 is the length of the over-flow gap flow channel 64;

[0059] r is the gap width of the over-flow gap flow channel 64;

[0060] μ is the dynamic viscosity of the circulation medium;

[0061] In the process of medium circulation, the following conditions need to be met,

[0062] R3 » R1 + R2;

[0063] The flow resistance of the pump shaft circulation flow channel 62 is R1;

[0064] The flow resistance of the circulation outlet flow channel 66 is R2;

[0065] The flow resistance of the over-flow gap flow channel 64 is R3;

[0066]

[0067] The basic principles of the present application are described above in combination with specific embodiments, but it should be noted that the advantages, advantages, effects, etc. mentioned in the present application are only examples and cannot be considered as the advantages, advantages, effects, etc. that must be possessed by each embodiment of the present application. In addition, the above-mentioned specific details are only for the purpose of example and for the purpose of understanding, and are not limited to the above-mentioned specific details. The above-mentioned details do not limit the present application to the above-mentioned specific details.

[0068] The block diagrams of the devices, apparatuses, equipment, systems referred to in this application are merely illustrative examples and are not intended to require or imply that the connections, arrangements, configurations must be as shown in the block diagrams. These devices, apparatuses, equipment, systems can be connected, arranged, configured in any manner as will be appreciated by those skilled in the art. Words such as "include," "comprise," "have," and the like, mean "including but not limited to," and are intended to be interpreted as open-ended terms, and are not intended to be interpreted as limiting. The words "or" and "and" as used herein, mean "and / or," unless otherwise explicitly stated. The word "such as" as used herein, means "such as but not limited to," and is intended to be interpreted as open-ended terms, and is not intended to be interpreted as limiting.

Claims

1. A spherical rotor pump, characterized by, The pump comprises a pump shell (1), a spherical pump head (5) coaxially arranged in the pump shell (1), a spherical rotor assembly (51) in the spherical pump head (5) driven to rotate by a pump shaft (4) to deliver medium, a rotor assembly (3) coaxially arranged with the pump shaft (4) in the pump shell (1), and a stator assembly (2) arranged outside the rotor assembly (3), the stator assembly (2) and the rotor assembly (3) electromagnetically inductively matched to drive the pump shaft (4) to rotate. The spherical rotor assembly (51) and the shell cavity of the spherical pump head (5) are provided with a spherical head gap flow channel (61) communicated with a pump head inlet (52), the pump shaft (4) is provided with a pump shaft circulation flow channel (62) penetrating the pump shaft (4) in the axial direction, the rotor assembly (3) and the stator assembly (2) are provided with an annular flow gap flow channel (64), the pump shell (1) is further provided with a circulation outlet flow channel (66) communicated with the pump head inlet (52), and the spherical 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 sequentially communicated to form a medium circulation cooling channel.

2. A spherical rotor pump according to claim 1, characterized in that The pump cavity of the pump shell (1) is provided with a bearing assembly (41) arranged at both ends of the pump shaft (4) and bidirectionally supporting the pump shaft (4), a bearing inner ring of the bearing assembly (41) is provided with a spiral liquid passage for the medium to pass through in the axial direction, a bearing at one end of the adjacent spherical pump head (5) is taken as a proximal end bearing, and a bearing away from the one end of the spherical pump head (5) is taken as a distal end bearing, the medium is divided after passing through the spherical head gap flow channel (61), a part of the medium sequentially passes through the pump shaft circulation flow channel (62), the liquid passage of the distal end bearing, the flow gap flow channel (64) and then enters the circulation outlet flow channel (66), and the other part of the medium passes through the liquid passage of the proximal end bearing and then enters the circulation outlet flow channel (66).

3. A spherical rotor pump according to claim 2, characterized in that A thrust disc (42) is arranged between the shaft shoulder of the pump shaft (4) and the bearing of the bearing assembly (41), the thrust disc (42) abuts against the shaft shoulder of the pump shaft (4) to bear the axial thrust of the pump shaft (4), and a recess is formed in the disc surface of the thrust disc (42) to allow the medium in the liquid passage outlet of the bearing to pass through.

4. A spherical rotor pump according to any one of claims 1 to 3, characterized in that The pump shell (1) is in a cylindrical structure with both ends open, the front flange (11) and the rear flange (12) are arranged at the openings of both ends of the pump shell (1), the stator shield sleeve (23) is arranged between the front flange (11) and the rear flange (12), and the front flange (11), the rear flange (12), the pump shell (1) and the stator shield sleeve (23) form a ring-shaped sealing space for the stator (21) to be arranged.

5. A spherical rotor pump according to claim 4, characterized in that The stator (21) and the winding assembly (22) are coaxially arranged, and the pump shell (1) is provided with an electrical interface (24) for external connection of a stator circuit.

6. A spherical rotor pump according to claim 4, characterized in that Epoxy resin is filled in a sealing cavity of the stator assembly (2).

7. A 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 shield sleeve (33) is arranged between the two end plates (31), the two end plates (31), the rotor shield sleeve (33) and the pump shaft (4) form a ring-shaped sealing space for the rotor (32) to be arranged, and a gap is formed between the rotor shield sleeve (33) and the stator shield sleeve (23) to form the flow gap flow channel (64).

8. A spherical rotor pump according to claim 4, characterized in that The front flange (11) is coaxially provided with a hydraulic base (14), 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 (43), and the sliding sleeve (43) is coaxially rotatably matched with the seat body of the spherical pump head (5) through a bearing.

9. A spherical rotor pump according to claim 2 or 3, characterized in that The bearings of the two bearing assemblies (41) are made of peek or graphite.

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