CN110761997A

CN110761997A - Micro-magnetic gear circulating pump

Info

Publication number: CN110761997A
Application number: CN201911029720.XA
Authority: CN
Inventors: 戴必柱; 李光耀
Original assignee: Wuxi Boyite Science & Technology Co Ltd
Current assignee: Wuxi Boyite Science & Technology Co Ltd
Priority date: 2019-10-28
Filing date: 2019-10-28
Publication date: 2020-02-07
Anticipated expiration: 2039-10-28
Also published as: CN110761997B

Abstract

The invention provides a micro-magnetic gear circulating pump which comprises a power mechanism, a mounting flange, a transition sleeve, an outer magnetic rotor, a pressure plate ring, an isolation sleeve, an inner magnetic rotor and a pump body which are sequentially and axially assembled, wherein the pressure plate ring forms two circles of outer ring through holes, inner ring through holes and central holes which are concentrically arranged; the isolating sleeve forms an outward-turned hem, the hem is axially embedded between the pressing plate ring and the front shell, the front shell forms a plurality of second blind holes, the first bolt extends through the inner ring through hole and is in threaded connection with the second blind holes, and the second bolt extends through the outer ring through hole and is in threaded connection with the first blind holes. The micro-magnetic gear circulating pump disclosed by the invention solves the hidden trouble of bolt loosening in the long-term use process of the conventional gear circulating pump, has a self-cooling effect, and has the advantages of high reliability, long service life and the like.

Description

Micro-magnetic gear circulating pump

Technical Field

The invention relates to the technical field of circulating pumps, in particular to a micro-magnetic gear circulating pump.

Background

A gear pump, i.e., a gear circulation pump, is a rotary pump that conveys or supercharges a liquid by changing and moving a displacement volume formed between a pump cylinder and a meshing gear. Two gears, pump body and front and back covers form two closed spaces, when the gears rotate, the space on the gear disengagement side becomes larger from smaller to larger to form vacuum to suck liquid, and the space on the gear engagement side becomes smaller from larger to smaller to squeeze liquid into the pipeline. The gear circulating pump has the technical advantage that a main shaft of the motor is completely isolated from a medium to be pumped, and has congenital technical advantages in the scenes of conveying various chemical media, oil, water, toxic, harmful, flammable and explosive liquids, corrosion resistance, acid and alkali resistance, high temperature resistance, high pressure resistance and the like.

The applicant finds that the Chinese patent with the publication number of CN104214089B discloses a novel magnetic gear pump after search. In this prior art, when base and preceding shell pass through the bolt assembly, the spacer sleeve that holds in the base crosses bolt and gasket and is connected with preceding shell, installs sealed O type circle between spacer sleeve and the preceding shell of pump, and the backshell forms the round hem that the spacer sleeve formed with preceding shell is acceptd completely. First, the applicant points out that even if bolts and gaskets are arranged in the prior art, the hidden danger of loosening the bolts still exists between the base and the front pump shell in the long-term use process. Secondly, in this prior art, the second shaft sleeve that the main shaft was assembled does not extend the preceding shell, and the purpose of this kind of structure is in order to prevent that the mobile medium that the mesochite is inside held from getting into the spacer sleeve, but this kind of technical scheme can not cool down the interior magnet of putting into in the spacer sleeve through lubricating oil to a certain extent when this gear circulating pump pumping fluid medium such as lubricating oil on the contrary. Finally, since the rotation speed of the main and the auxiliary gears is very high, usually above 2000 rpm, the self-cooling effect of the gear circulation pump disclosed in the prior art is not good. Finally, the master gear and the slave gear in the prior art are respectively sleeved on the main shaft and the slave shaft. In order to ensure the reliability of the assembly of the main shaft and the driven shaft by respectively sleeving the main gear and the driven gear on the main shaft and the driven shaft, the main shaft and the main gear are usually configured to be in interference fit, but in the prior art, because the joint of the main shaft and the main gear is exposed in a fluid medium, some corrosive fluid medium may intrude from a gap at the joint of the main shaft and the main gear, so that the interference fit is damaged, and the main shaft and the main gear slip occurs, so that the power transmission between the main gear and the driven gear is greatly influenced, and finally, the pumping effect on the fluid medium is influenced.

In view of the above, there is a need for an improved gear circulation pump in the prior art to solve the above problems.

Disclosure of Invention

The invention aims to disclose a micro-magnetic gear circulating pump, which is used for overcoming the defects of the conventional gear circulating pump, preventing bolts in the micro-magnetic gear circulating pump from loosening, realizing a self-cooling effect and improving the reliability of the assembly of a driving shaft for driving a driving gear.

In order to achieve the above object, the present invention provides a micro-magnetic gear circulation pump, comprising:

the pump comprises a power mechanism, a mounting flange, a transition sleeve, an outer magnetic rotor and a pressure plate ring which are sequentially and axially assembled, an isolation sleeve which is nested with the pressure plate ring and is axially accommodated in the outer magnetic rotor, an inner magnetic rotor and a pump body which are accommodated in the isolation sleeve, wherein the pump body comprises a front shell, a middle shell and a tail shell which are axially assembled;

the pressing plate ring forms two circles of outer ring through holes, inner ring through holes and central holes which are arranged in a concentric circle mode, and one side, facing the pressing plate ring, of the transition sleeve forms a propping ring which is concavely arranged on the end face and provided with a plurality of first blind holes;

the isolating sleeve forms an outward-turned folded edge, the folded edge is axially embedded between the pressure plate ring and the front shell, the front shell forms a plurality of second blind holes, the first bolt extends through the inner ring through hole and is in threaded connection with the second blind holes, and the second bolt extends through the outer ring through hole and is in threaded connection with the first blind holes.

As a further improvement of the invention, the front shell and the pressure plate ring clamp the folded edge and form an annular gap, and the thickness of the annular gap along the axial direction is 0.5-1 mm.

As a further improvement of the invention, the inner wall of the transition sleeve forms an annular groove, the outer annular wall of the outer magnetic rotor is separated from the abutting ring, and the annular groove is provided with a drain hole which radially penetrates through the annular wall of the transition sleeve.

As a further improvement of the present invention, the micro-magnetic gear circulation pump further comprises:

a first seal ring embedded in the front shell and held by the hem, a second seal ring embedded in the middle shell and held by the front shell, a third seal ring embedded in the tail shell and held by the middle shell, and

the driving gear is simultaneously meshed with the two driven gears;

a first accommodating cavity, a second accommodating cavity and a third accommodating cavity which are arranged in a straight line and used for accommodating the driving gear and the two driven gears and are cylindrical are formed in the middle shell, a fourth accommodating cavity and a fifth accommodating cavity are arranged on two sides of the first accommodating cavity and the second accommodating cavity, a sixth accommodating cavity and a seventh accommodating cavity are arranged on two sides of the second accommodating cavity and the third accommodating cavity, the tail shell is provided with a liquid inlet and a liquid outlet, the liquid inlet is communicated with the fourth accommodating cavity and the sixth accommodating cavity, and the liquid outlet is communicated with the fifth accommodating cavity and the seventh accommodating cavity;

the axial direction of the driven gear is provided with a driven shaft which axially and completely penetrates through the driven gear, the axial direction of the driving gear is provided with a driving shaft which partially penetrates through the driving gear, the outer part of the driving shaft is sleeved with a positioning shaft sleeve, the axis of the front shell is provided with a central hole which is axially penetrated through by the driving shaft, and the driving shaft penetrates through the central hole and extends into the inner magnetic rotor.

the first positioning pin and the second positioning pin axially penetrate through the middle shell;

the first locating pin and the second locating pin extend into the front shell and the tail shell along the axial direction of each other.

As a further development of the invention, the fold extends in a radially outward direction over the first sealing ring.

As a further improvement of the invention, the inner magnetic rotor is formed by nesting a first magnetic ring and an insulating ring which are arranged in a concentric circle, and a waist-shaped hole is formed at the center of the insulating ring.

As a further improvement of the invention, the positioning shaft sleeve forms a channel for the axial penetration of the driving shaft, and a gap of 1-2 μm is formed between the driving shaft and the inner wall surface of the channel; a gap of 1-2 mu m is formed between the outer wall surface of the positioning shaft sleeve and the inner wall surface of the central hole.

As a further improvement of the present invention, the outer magnetic rotor is composed of an annular metal shell and a second magnetic ring embedded in the annular metal shell;

the isolating sleeve is embedded into the second magnetic ring and separated from the annular inner wall surface of the second magnetic ring, a first mounting hole is formed in the end surface, facing the transition sleeve, of the annular metal shell, a second mounting hole which is coaxial with the first mounting hole is formed in the transition sleeve, and the mounting flange is provided with a third blind hole which is coaxial with the second mounting hole;

and bolts continuously penetrate through the first mounting hole and the second mounting hole and are fixedly connected with the third blind holes in a threaded manner.

As a further improvement of the invention, the positioning shaft sleeve, the driving gear and the driven gear are made of polytetrafluoroethylene or polyaryletherketone; the pump body is made of stainless steel;

the annular metal shell is axially and convexly provided with a connecting cylinder, a shaft hole for accommodating the connecting cylinder is formed in the circle center of the mounting flange, and the side wall of the connecting cylinder is provided with at least one positioning hole;

the power mechanism is axially and reliably assembled with the connecting cylinder.

Compared with the prior art, the invention has the beneficial effects that:

the micro-magnetic gear circulating pump disclosed by the invention solves the hidden trouble of bolt loosening in the long-term use process of the conventional gear circulating pump, has a self-cooling effect, solves the technical problem that a driving gear and a driving shaft slip in time, and has the advantages of high reliability, long service life and the like.

Drawings

FIG. 1 is an exploded view of a micro-magnetic gear circulation pump according to the present invention;

FIG. 2 is an exploded view of the mounting flange and transition sleeve and the outer magnetic rotor;

FIG. 3 is a perspective view of the mounting flange and transition sleeve and outer magnetic rotor and spacer sleeve and pressure plate ring shown in FIG. 2 after assembly;

FIG. 4 is a perspective view of the front housing comprising the pump body in a first perspective view;

FIG. 5 is a schematic view of the platen ring and first and second bolts connecting the transition sleeve and the front shell, respectively;

FIG. 6 is a perspective view of the platen ring;

FIG. 7 is a front view of the micro-magnetic gear circulation pump of the present invention;

FIG. 8 is a cross-sectional view taken along line D-D of FIG. 7;

FIG. 9 is a perspective view of the aft case from a first perspective, with the dashed lines in FIG. 9 indicating the oil passages in the aft case;

FIG. 10 is a cross-sectional view taken along line E-E of FIG. 7;

FIG. 11 is a sectional view taken along the line F-F in FIG. 7;

FIG. 12 is a sectional view taken along line G-G of FIG. 7;

FIG. 13 is a perspective view of the tail shell in another perspective;

fig. 14 is a perspective view of the front housing from another perspective.

Detailed Description

The present invention is described in detail with reference to the embodiments shown in the drawings, but it should be understood that these embodiments are not intended to limit the present invention, and those skilled in the art should understand that functional, methodological, or structural equivalents or substitutions made by these embodiments are within the scope of the present invention.

It should be understood that in various embodiments, the terms "center", "longitudinal", "lateral", "length", "width", "thickness", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "clockwise", "counterclockwise", "axial", "radial", "circumferential", "positive", "negative", etc. indicate orientations or positional relationships based on the orientations or positional relationships shown in the drawings, and are only used for convenience of describing the present technical solution and simplifying the description, but do not indicate or imply that the device or element referred to must have a specific orientation, be constructed in a specific orientation, and be operated, and thus should not be construed as limiting the present technical solution.

The first embodiment is as follows:

please refer to fig. 1 to 13, which illustrate an embodiment of the micro-magnetic gear circulation pump according to the present invention. In particular, in the present embodiment, the term "axial assembly" refers to "axial" or "assembly axis" with equivalent meaning, and specifically, the spatial position relationship shown as axis 100 in fig. 1.

As shown in fig. 1 and 8, in the present embodiment, the micro-magnetic gear circulation pump 200 includes:

the pump comprises a power mechanism, a mounting flange 11, a transition sleeve 12, an outer magnetic rotor 13 and a pressure plate ring 14 which are sequentially and axially assembled, an isolation sleeve 15 which is nested with the pressure plate ring 14 and is axially contained in the outer magnetic rotor 13, an inner magnetic rotor 16 and a pump body, wherein the inner magnetic rotor 16 and the pump body are contained in the isolation sleeve 15, and the pump body comprises a front shell 18, a middle shell 20 and a tail shell 30 which are axially assembled. The circumference of the circular contact surface of the front shell 18 facing the middle shell 20 is provided with three blind holes 183, the side of the middle shell 20 along the direction of the shaft 100 is provided with three through holes 202, the side of the tail shell 30 along the direction of the shaft 100 is provided with three through holes 301, and the bolt 31 is screwed into the blind holes 183 after continuously penetrating through the through holes 301 and the through holes 202, so that the front shell 18, the middle shell 20 and the tail shell 30 are reliably assembled in the axial direction. The three through holes 202, the three blind holes 183 and the three through holes 301 are all annularly and symmetrically distributed around the shaft 100 and are arranged in the same straight line, namely the through holes 301, the through holes 202 and the blind holes 183 are located in the same straight line, so that the three bolts 31 continuously and axially penetrate in the direction parallel to the shaft 100, and the front shell 18, the middle shell 20 and the tail shell 30 are axially assembled to form the pump body.

In this embodiment, the mounting flange 11 and the transition sleeve 12 are of a split structure, and as a reasonable deformation of this embodiment, the mounting flange 11 and the transition sleeve 12 can be configured into an integrated structure; meanwhile, four through holes 112 are formed in the circumference of the mounting flange 11, and are fixedly connected with a base (e.g., a mounting seat of a motor) of the power mechanism through bolts (not shown).

In order to improve the sealing performance of the axial assembly of the pump body, as shown in fig. 13, the tail casing 30 is provided with a circle of grooves 302, the third sealing ring 29 is embedded in the grooves 302, and the circular surface of the middle casing 20, which is in contact with the front casing 18, is provided with a circle of grooves, and the second sealing ring 19 is embedded in the grooves. The second sealing ring 19 and the third sealing ring 29 can be made of silica gel or rubber with good weather resistance and corrosion resistance. Referring to fig. 4, a circular contact surface of the front shell 18 facing the platen ring 14 is provided with a ring of grooves 185, and the first seal ring 17 is embedded in the grooves 185, wherein the cross sections of the second seal ring 19 and the third seal ring 29 are circular, the cross section of the first seal ring 17 is oval, and the wider contact surface of the first seal ring 17 contacts the folded edge 151, so as to improve the reliability of the sealing.

Preferably, the micro-magnetic gear circulation pump 200 further includes: a first packing 17 fitted into the front case 18 and pressed by the folded edge 151, a second packing 19 fitted into the middle case 20 and held by the front case 18, a third packing 29 fitted into the tail case 30 and held by the middle case 20, and a driving gear 28, two driven gears, i.e., a driven gear 26 and a driven gear 27, simultaneously engaged with the driving gear 28.

The middle shell 20 is formed with a first receiving cavity 211, a second receiving cavity 212 and a third receiving cavity 213 which are arranged in a straight line and are cylindrical for receiving the driving gear 28 and the two driven gears, a fourth receiving cavity 205 and a fifth receiving cavity 206 which are arranged at two sides of the first receiving cavity 211 and the second receiving cavity 212, and a sixth receiving cavity 207 and a seventh receiving cavity 208 which are arranged at two sides of the second receiving cavity 212 and the third receiving cavity 213, the tail shell 30 is provided with a liquid inlet 303 and a liquid outlet 304, the liquid inlet 303 is communicated with the fourth receiving cavity 205 and the sixth receiving cavity 207, and the liquid outlet 304 is communicated with the fifth receiving cavity 206 and the seventh receiving cavity 208.

Referring to fig. 9 to 13, in the present embodiment, the tail shell 30, the middle shell 20 and the front shell 18 are all cylindrical, and the annular side surface of the tail shell 30 is provided with two planes, and the two planes are respectively provided with a liquid inlet 303 and a liquid outlet 304. The inlet port 303 forms an inlet 331 and an inlet 341, respectively, for liquid to flow into the middle shell 20, on the circular contact surface of the tail shell 30 on the side facing the middle shell 20, and the outlet port 304 forms an outlet 332 and an outlet 342, respectively, for liquid to flow out of the middle shell 20, on the circular contact surface of the tail shell 30 on the side facing the middle shell 20. The inlet 331 and the inlet 341 are both in communication with the inlet 303, and the outlet 332 and the outlet 342 are both in communication with the outlet 304. The inlet 331 and the outlet 342 form one fluid circulation path, and the inlet 332 and the outlet 341 form the other fluid circulation path.

The inlet 331 is communicated with the fourth accommodating cavity 205, and the outlet 342 is communicated with the fifth accommodating cavity 206; meanwhile, the inlet 341 communicates with the sixth receiving chamber 207, and the outlet 342 communicates with the seventh receiving chamber 208. The first, second, and third receiving

cavities

211, 212, and 213 are all parallel to the shaft 100. The driving gear 28 rotates in the second receiving cavity 212, the driven gear 27 rotates in the first receiving cavity 211, the driven gear 26 rotates in the third receiving cavity 213, and the driven gear 27 and the driven gear 26 are simultaneously engaged with the driving gear 28 and synchronously rotate under the driving of the driving gear 28. During the meshing process of the driving gear 28 and the driven gear 27, the liquid is pressed into the fifth accommodating cavity 206 from the fourth accommodating cavity 205 through the meshing of teeth and teeth; similarly, during the engagement of the driving gear 28 and the driven gear 26, the liquid is pressed into the seventh receiving cavity 208 from the sixth receiving cavity 207 through the engagement of the teeth. Meanwhile, a gap of 5 to 10 micrometers is formed between the driving gear 28 and the two arc-shaped side walls of the second accommodating cavity 212 to ensure the dynamic sealing effect during the rotation, and a gap of 5 to 10 micrometers is also formed between the driven gear 27 and one continuous arc-shaped side wall surface of the first accommodating cavity 211 and the third accommodating cavity 213 of the driven gear 26 to ensure the dynamic sealing effect during the rotation. Specifically, the driving gear 28, the driven gear 26 and the driven gear 7 are made of polytetrafluoroethylene or polyaryletherketone; the pump body is made of stainless steel.

In particular, referring to fig. 1, 8 and 10, in the present embodiment, the driven shaft 23 axially penetrating the driven gear 26 is axially disposed in the driven gear 27, the driven shaft 22 axially penetrating the driven gear 26 is axially disposed in the driven gear 26, the driving shaft 21 axially penetrating the driving gear 28 is partially disposed in the driving gear 28, and the positioning boss 181 is fitted around the driving shaft 21. The front housing 18 has a central hole 180 formed at the axial center thereof for the driving shaft 21 to axially pass through, and the driving shaft 21 passes through the central hole 180 and extends into the inner magnetic rotor 16. In the embodiment, since the driven shaft 22 integrally penetrates through the driven gear 26 (in the direction shown by the shaft 100) and the driven shaft 23 integrally penetrates through the driven gear 28 (in the direction shown by the shaft 100), the assembly process of the micro-magnetic gear circulation pump can be simplified in the actual manufacturing process, and the liquid to be pumped, especially when the liquid to be pumped is oil, can lubricate the gap between the driven shaft and the driven gear through the oil, so that the friction force of the driven gear in the pivoting motion around the driven shaft is reduced, and the liquid pumping effect is improved; meanwhile, in the present embodiment, since the driving shaft 21 is not exposed in the middle casing 20, the intrusion of the liquid to be pumped into the shielding cavity formed inside the driving shaft 21 and the driving gear 28 for accommodating the driving shaft 21 can be effectively delayed. Normally, the driving shaft 21 and the driving gear 28 are configured to be in interference fit, so that, with the above structure, the liquid to be pumped is effectively prevented from intruding into the gap between the driving shaft 21 and the driving gear 28, and the phenomenon of 'slipping' between the driving shaft 21 and the driving gear 28 is effectively prevented, thereby ensuring the reliability and durability of the micro-magnetic gear circulating pump.

As shown in fig. 1 to 3 and 5 to 6, in the present embodiment, the platen ring 14 forms two circles of outer ring through holes 147 and inner ring through holes 148 arranged in concentric circles and a central hole 149. The six outer ring through holes 147 are uniformly distributed around the shaft 100, and the distances from the circle centers of the six outer ring through holes 147 to the shaft 100 are equal; the four inner ring through holes 148 are evenly distributed around the shaft 100 and the distances from the centers of the four inner ring through holes 148 to the shaft 100 are equal. The transition sleeve 12 is formed with a support ring 121 recessed from an end surface and provided with a plurality of first blind holes 122 on a side facing the platen ring 14. The inner wall surface of the first blind hole 122 is internally threaded. The transition sleeve 12 forms a second mounting hole 125 arranged coaxially with the first mounting hole 133, the mounting flange 11 is provided with a third blind hole 111 arranged coaxially with the second mounting hole 125, and an inner wall surface of the third blind hole 111 is provided with an internal thread. Referring to fig. 2 and 3, in the present embodiment, after the platen ring 14 is axially assembled with the transition sleeve 12, the platen ring 14 rests on the abutment ring 121 and is integrally received by the transition sleeve 12. Bolts are continuously inserted through the first mounting hole 133 and the second mounting hole 125, and are screwed and fixed to the third blind holes 111. The spacer sleeve 15 is embedded in the second magnetic ring 134 and separated from the annular inner wall surface of the second magnetic ring 134, and the end surface of the annular metal shell 131 facing the transition sleeve 12 forms a first mounting hole 133.

When the mounting flange 11, the transition sleeve 12 and the outer magnetic rotor 13 shown in fig. 2 are axially assembled, four bolts (not shown) are continuously inserted through the first mounting hole 133 and the second mounting hole 125 and screwed into the third blind hole 111, so that the mounting flange 11, the transition sleeve 12 and the outer magnetic rotor 13 are reliably axially assembled. Meanwhile, the central hole 149 is used for the entire cylindrical protrusion of the isolation sleeve 15 to pass through, and the entire cylindrical protrusion of the isolation sleeve 15 is accommodated in the cylindrical cavity formed by the second magnetic ring 134 and having a circular cross section.

As shown in fig. 2, the outer magnetic rotor 13 is composed of an annular metal shell 131 and a second magnetic ring 134 embedded in the annular metal shell 131. The spacer sleeve 15 forms an outwardly turned flange 151, the flange 151 being axially inserted between the platen ring 14 and the front shell 18. In particular, as shown in fig. 8, the flange 151 extends in a radially outward direction over the first sealing ring 17. So-called "Radially outward of"refers to reference along axis 100. The annular cover surface formed by the fold 151 thus completely covers the first sealing ring 17, and when the front housing 18 and the pressure plate ring 14 are axially assembled by the bolts 141 extending into the inner ring passage opening 148, the first sealing ring 17 can be held securely by the fold 151 and rests at least by the fold 151 between the pressure plate ring 14 and the front housing 18, forming the annular gap 140. Since the platen ring 14 is relatively thin, typically 0.5 to 1.0mm, in the direction of the axis 100, by forming the annular gap 140, a deformation space margin is increased for slight axial deformation of the platen ring 14 in the direction of the axis 100.

The front housing 18 is formed with a plurality of second blind holes 184, and the inner wall surfaces of the second blind holes 184 are internally threaded, and are screwed with the second blind holes 184 by extending the first bolts 141 through the inner ring through holes 148 and extending the second bolts 142 through the outer ring through holes 147 and into the first blind holes 122 to be screwed with the first blind holes 122, so as to achieve axial fitting. The applicant indicates that, in the present embodiment, the first bolts 141 and the second bolts 142 are configured to form axially opposite forces in the directions of arrows B and a in fig. 5 respectively, so that the pre-tightening force is generated by the pressure plate ring 14, which avoids the problem of bolt loosening caused by long-term use of the micro-magnetic gear circulation pump 200 due to direct axial assembly using long bolts in the prior art, and significantly improves the reliability of the micro-magnetic gear circulation pump 200. Based on the pretightening force generated by the pressure plate ring 14, the technical effects of 'anti-loose' and 'anti-thrust' can be generated under the combined action of the pressure plate ring 14, the first bolts 141 and the second bolts 142.

Meanwhile, the front shell 18 and the pressure plate ring 15 clamp the folded edge 151 and form an annular gap 140, and the thickness of the annular gap 140 in the axial direction is 0.5-1 mm. The inner wall of the transition sleeve 12 forms an annular groove 120, the outer annular wall of the outer magnetic rotor 13 and the abutting ring 121 are separated from each other, and the annular groove 120 is provided with a drainage hole 124 radially penetrating through the annular wall of the transition sleeve 12. Since the outer magnetic rotor 13 has an operation characteristic of a high rotation speed, by forming the annular groove 120, a cooling effect can be exerted on the outer magnetic rotor 13, particularly on the annular metal shell 131, with respect to the air in the annular groove 120.

In addition, since the micro-magnetic gear circulation pump 200 is generally used in an open air environment or a severe working condition, when a low-temperature liquid is conveyed, since water vapor exists in the air, when the environmental temperature change of the micro-magnetic gear circulation pump is large, the outer wall surface of the annular metal shell 131 is "dew". In the present embodiment, a water guiding groove 123 is formed on the annular step on which the second mounting hole 125 is formed, and the water guiding groove 123 is radially outward in the direction of the vertical axis 100, and is communicated with the water discharging hole 124, so as to discharge the residual "condensation" in the annular groove 120 through the water discharging hole 124, so as to ensure the reliability of the rotation of the outer magnetic rotor 13, and particularly, to improve and ensure the electrical insulation of the micro-magnetic gear circulation pump 200.

It should be noted that, in the actual installation of the micro-magnetic gear circulation pump 200 disclosed in the present embodiment, the water chute 123 is preferably arranged in a vertical manner, so as to further facilitate the drainage of the condensed water out of the transition sleeve 12 through the water drainage hole 124.

The inner magnet rotor 16 is formed by nesting a first magnetic ring 161 and an insulating ring 162 which are arranged in concentric circles, and the insulating ring 162 has no magnetism. In the present embodiment, the inner magnet rotor 16 is driven by the rotation of the outer magnet rotor 13 to perform a pivotal motion about the axis 100 in the direction shown, and the driving gear 28 is driven to perform an axial rotation in the middle housing 20 by the driving shaft 21 axially fitted with the inner magnet rotor 16, so that the driven gear 27 and the driven gear 26 are finally driven to perform an axial rotation synchronously by the driving gear 28. Specifically, in the present embodiment, the driving gear 28, the driven gear 27, the driven gear 26 and the insulating ring 162 are all made of teflon.

The insulation ring 162 has a waist-shaped hole 163 formed at the center thereof. One end of the driving shaft 21 is reliably clamped with the waist-shaped hole 163. The positioning shaft sleeve 181 forms a channel 182 for the axial penetration of the driving shaft 21, and a gap of 1-2 μm is formed between the driving shaft 21 and the inner wall surface of the channel 182; a gap of 1-2 μm is formed between the outer wall surface of the positioning sleeve 181 and the inner wall surface of the center hole 180. The positioning sleeve 181 is made of polytetrafluoroethylene or polyaryletherketone. Through the formation of the gap of 1-2 μm, the liquid to be pumped, which flows through the shielding cavities such as the first receiving cavity 211, the second receiving cavity 212 and the third receiving cavity 213 formed in the middle shell 20, can flow into the annular cavity 144 formed by the front shell 18, the inner magnetic rotor 16 and the spacer sleeve 15 through the gap of 1-2 μm, so as to cool the inner magnetic rotor 16.

Referring to fig. 1 and 8, in the present embodiment, the annular metal shell 131 is axially protruded with a connecting cylinder 132, a center of the mounting flange 11 forms a shaft hole 110 for receiving the connecting cylinder 132, and a sidewall of the connecting cylinder 132 is provided with at least one positioning hole 138. A pin (not shown) may be radially disposed in the alignment hole 138 to provide an axially secure fit of the power mechanism to the connector barrel 132. Meanwhile, the connecting cylinder 132 is separated from the annular inner wall surface of the shaft hole 110, and an annular gap of 2-5 mm is formed.

Finally, referring to fig. 11 to 13, in the present embodiment, the liquid inlet 303 extends transversely into the tail shell 30 and is communicated with the inlet 331 and the inlet 341 of the inflow middle shell 20 respectively; the exit port 304 extends transversely into the tail housing 30 and communicates with the

exit ports

332 and 342, respectively, of the outflow center housing 20. The inlet port 303 extends transversely into the tail housing 30 at an angle of 105 degrees relative to the axis 100 to the outlet port 304 extending transversely into the tail housing 30. Two liquid pumping paths are respectively formed between the driving gear 28 and the driven gear 26, and between the driving gear 28 and the driven gear 27, so that the pumping capacity of the micro-magnetic force gear circulating pump 200 in unit time is improved, and the pumping effect on liquid is improved.

The micro-magnetic gear circulation pump 200 disclosed in this embodiment can pump water, lubricating oil, and various acid and alkali liquids.

Example two:

referring back to fig. 1 and fig. 14, compared to the micro-magnetic gear circulation pump 200 of the first embodiment, the main difference of the micro-magnetic gear circulation pump 200 of the present embodiment is that, in the present embodiment, the micro-magnetic gear circulation pump 200 further includes: a first alignment pin 24 and a second alignment pin 25 axially extend through the center housing 20.

Specifically, the first positioning pin 24 and the second positioning pin 25 extend into the front shell 18 and the rear shell 20 in the axial direction of each other. The first positioning pin 24 and the second positioning pin 25 extend in a direction parallel to the shaft 100. The middle case 20 also has formed therein a positioning passage 203 through which the first positioning pin 24 passes in a direction parallel to the shaft 100, and a positioning passage 201 through which the second positioning pin 25 passes in a direction parallel to the shaft 100. The first positioning pin 24 and the second positioning pin 25 respectively extend through the middle housing 20 and then further extend into a fourth blind hole 188 and a fifth blind hole 189 correspondingly arranged on the front housing 18, and inner wall surfaces of the fourth blind hole 188 and the fifth blind hole 189 are smooth.

As shown in fig. 14, in the present embodiment, a through hole 1801 and a through hole 1802 are provided on the circular contact surface of the front case 18 facing the middle case 20 so as to communicate with each other, and the through hole 1801 and the through hole 1802 communicate with each other through a passage (not shown) built in the front case 18. Similarly, a through hole 1803 and a through hole 1804 are disposed on the circular contact surface of the front shell 18 facing the middle shell 20, and the through hole 1803 and the through hole 1804 are communicated through a channel (not shown) built in the front shell 18. The pumped liquid in the middle shell 20 can cool the front shell 18 through the channel connected between the through hole 1801 and the through hole 1802 and the channel communicated between the through hole 1803 and the through hole 1804. Meanwhile, the through hole 1801 is only communicated with the sixth accommodating cavity 207, and the through hole 1802 is only communicated with the seventh accommodating cavity 208; the through hole 1803 communicates with only the fifth receiving cavity 206, and the through hole 1804 communicates with only the fourth receiving cavity 205. In this embodiment, the first positioning pin 24 and the second positioning pin 25 are arranged to achieve a fool-proof effect of preventing mis-assembly, so that the through hole 1801, the through hole 1802, the through hole 1803, and the through hole 1804 can be accurately matched and connected with the sixth accommodating cavity 207, the seventh accommodating cavity 208, the fifth accommodating cavity 206, and the fourth accommodating cavity 205.

Please refer to the embodiment one, and detailed descriptions thereof are omitted herein for technical solutions of the same parts in this embodiment and the embodiment one.

The above-listed detailed description is only a specific description of a possible embodiment of the present invention, and they are not intended to limit the scope of the present invention, and equivalent embodiments or modifications made without departing from the technical spirit of the present invention should be included in the scope of the present invention.

It will be evident to those skilled in the art that the invention is not limited to the details of the foregoing illustrative embodiments, and that the present invention may be embodied in other specific forms without departing from the spirit or essential attributes thereof. The present embodiments are therefore to be considered in all respects as illustrative and not restrictive, the scope of the invention being indicated by the appended claims rather than by the foregoing description, and all changes which come within the meaning and range of equivalency of the claims are therefore intended to be embraced therein. Any reference sign in a claim should not be construed as limiting the claim concerned.

Furthermore, it should be understood that although the present description refers to embodiments, not every embodiment may contain only a single embodiment, and such description is for clarity only, and those skilled in the art should integrate the description, and the embodiments may be combined as appropriate to form other embodiments understood by those skilled in the art.

Claims

1. Micro-magnetic force gear circulating pump, its characterized in that includes:

the pump comprises a power mechanism, a mounting flange (11), a transition sleeve (12), an outer magnetic rotor (13) and a pressure plate ring (14) which are sequentially and axially assembled, an isolation sleeve (15) which is nested with the pressure plate ring (14) and axially accommodated in the outer magnetic rotor (13), an inner magnetic rotor (16) and a pump body which are accommodated in the isolation sleeve (15), wherein the pump body comprises a front shell (18), a middle shell (20) and a tail shell (30) which are axially assembled;

the pressure plate ring (14) is provided with two circles of outer ring through holes (147), inner ring through holes (148) and a central hole (149) which are arranged in a concentric circle manner, and one side of the transition sleeve (12) facing the pressure plate ring (14) is provided with a leaning ring (121) which is concavely arranged on the end surface and is provided with a plurality of first blind holes (122);

the isolating sleeve (15) forms an outward-turned folded edge (151), the folded edge (151) is axially embedded between the pressure plate ring (14) and the front shell (18), the front shell (18) forms a plurality of second blind holes (184), the first bolts (141) extend through the inner ring through holes (148) and are in threaded connection with the second blind holes (184), and the second bolts (142) extend through the outer ring through holes (147) and are in threaded connection with the first blind holes (122).

2. The micro-magnetic gear circulating pump according to claim 1, wherein the front shell (18) and the platen ring (15) clamp a folded edge (151) and form an annular gap (140), and the thickness of the annular gap (140) in the axial direction is 0.5-1 mm.

3. Micro-magnetic gear circulation pump according to claim 1, characterized in that the inner wall of the transition sleeve (12) forms an annular groove (120), the outer annular wall of the outer magnetic rotor (13) and the abutment ring (121) are separated from each other, the annular groove (120) is provided with drainage holes (124) radially penetrating the annular wall of the transition sleeve (12).

4. The micro-magnetic gear circulation pump of any one of claims 1 to 3, further comprising:

a first seal ring (17) inserted into the front shell (18) and pressed by the folded edge (151), a second seal ring (19) inserted into the middle shell (20) and held by the front shell (18), a third seal ring (29) inserted into the tail shell (30) and held by the middle shell (20), and

a drive gear (28), two driven gears that are simultaneously meshed with the drive gear (28);

the middle shell (20) is internally provided with a first accommodating cavity (211), a second accommodating cavity (212) and a third accommodating cavity (213) which are linearly arranged, used for accommodating the driving gear (28) and the two driven gears and cylindrical, a fourth accommodating cavity (205) and a fifth accommodating cavity (206) which are arranged at two sides of the first accommodating cavity (211) and the second accommodating cavity (212), and a sixth accommodating cavity (207) and a seventh accommodating cavity (208) which are arranged at two sides of the second accommodating cavity (212) and the third accommodating cavity (213), the tail shell (30) is provided with a liquid inlet (303) and a liquid outlet (304), the liquid inlet (303) is communicated with the fourth accommodating cavity (205) and the sixth accommodating cavity (207), and the liquid outlet (304) is communicated with the fifth accommodating cavity (206) and the seventh accommodating cavity (208);

the driven gear is axially provided with a driven shaft which axially and completely penetrates through the driven gear, the driving gear (28) is axially provided with a driving shaft (21) which partially penetrates through the driving gear, a positioning shaft sleeve (181) is sleeved outside the driving shaft (21), a center hole (180) which is axially penetrated through the driving shaft (21) is formed in the axis of the front shell (18), and the driving shaft (21) penetrates through the center hole (180) and extends into the inner magnetic rotor (16).

5. The micro-magnetic gear circulation pump of claim 4, further comprising:

a first positioning pin (24) and a second positioning pin (25) axially penetrate through the middle shell (20);

the first positioning pin (24) and the second positioning pin (25) extend into the front shell (18) and the rear shell (20) in the axial direction of each other.

6. Micro-magnetic gear circulation pump according to claim 4, wherein the flange (151) extends in a radially outward direction over the first sealing ring (17).

7. The micro-magnetic force gear circulation pump according to claim 1, 2, 3, 5 or 6, wherein the inner magnetic rotor (16) is formed by nesting a first magnetic ring (161) and an insulating ring (162) which are arranged in a concentric circle, and a waist-shaped hole (163) is formed at the center of the insulating ring (162).

8. The micro-magnetic gear circulating pump according to claim 4, wherein the positioning shaft sleeve (181) forms a channel (182) for the driving shaft (21) to axially penetrate through, and a gap of 1-2 μm is formed between the driving shaft (21) and the inner wall surface of the channel (182); a gap of 1-2 mu m is formed between the outer wall surface of the positioning shaft sleeve (181) and the inner wall surface of the central hole (180).

9. Micro-magnetic gear circulation pump according to claim 7, characterized in that said outer magnetic rotor is composed of an annular metal shell (131) and a second magnetic ring (134) embedded inside the annular metal shell;

the isolating sleeve (15) is embedded into the second magnetic ring (134) and separated from the annular inner wall surface of the second magnetic ring (134), a first mounting hole (133) is formed in the end surface, facing the transition sleeve (12), of the annular metal shell (131), a second mounting hole (125) which is coaxially arranged with the first mounting hole (133) is formed in the transition sleeve (12), and a third blind hole (111) which is coaxially arranged with the second mounting hole (125) is formed in the mounting flange (11);

the bolt continuously penetrates through the first mounting hole (133) and the second mounting hole (125) and is screwed and fixed with the third blind hole (111).

10. The micro-magnetic gear circulating pump of claim 9, wherein the positioning sleeve (181), the driving gear (28) and the driven gear are made of teflon or polyaryletherketone; the pump body is made of stainless steel;

the annular metal shell (131) is axially and convexly provided with a connecting cylinder (132), a shaft hole (110) for accommodating the connecting cylinder (132) is formed in the circle center of the mounting flange (11), and the side wall of the connecting cylinder (132) is provided with at least one positioning hole (138);

the power mechanism is axially and reliably assembled with the connecting cylinder (132).