CN116613953A - Magnetic force driver with less or no cantilever - Google Patents

Abstract

The invention relates to a magnetic actuator with little or no cantilever, comprising: an inner magnetic rotor, a spacer bush, an outer magnetic rotor, a frame or a base and a motor; the inner magnetic rotor, the isolation sleeve and the outer magnetic rotor are sleeved from inside to outside; the inner rotor is a transmission shaft; the outer rotor of the outer magnetic rotor is connected with the driving shaft at the fixed end thereof through a coupler; the isolation sleeve is connected with the pump body through a flange at the opening end of the isolation sleeve; bearings a1 and a2 are respectively arranged between the inner walls of the opening end and the closed end of the isolation sleeve and the inner rotor; the isolating sleeve is provided with an extending shaft outside an end cover at the closed end of the isolating sleeve, the extending shaft is coaxially fixed with the isolating sleeve and sleeved in the outer rotor or the coupler, and a bearing b is arranged between the inner wall of the outer rotor or the coupler and the extending shaft. The invention obviously improves the safety and energy-saving effect, greatly reduces vibration hazard and improves the reliability of equipment. Can be widely applied to the equipment such as the prior magnetic pump, the magnetic stirrer and the like.

Description

Magnetic force driver with less or no cantilever

Technical Field

The present invention relates to magnetic actuators, and more particularly to magnetic actuators with few or no cantilevers.

Background

The magnetic driver is widely applied to occasions where the medium is not allowed to leak, such as magnetic pumps, magnetic stirrers, reaction kettles, evaporators and the like. The magnetic force driver commonly used on the existing magnetic force pump is a widely used structure nowadays, as shown in fig. 14, but the technology is mature, and various problems exist in the structure, including:

(1) The eddy current loss is large. The shaft of the inner magnetic rotor is sleeved on two bearings in a bearing support sleeve, one end of the bearing support sleeve is cantilever, which is equivalent to the position of the inner magnetic rotor on the shaft of the cantilever, in addition, one end of the inner magnetic rotor is cantilever, and the cantilever structure must meet the requirements on rigidity and stability during operation, so the support sleeve cannot be too thin, the wall thickness cannot be too thin, the length and the diameter of the magnetic driver are limited, and the inner rotor, the isolation sleeve and the outer rotor cannot be made into a slender structure; the construction machine is most inadvisable to the cantilever structure, especially the transmission equipment. This also explains why today's magnetic drives are not slim. With this, it is impossible to reduce the eddy current loss by further reducing the diameter of the spacer. If the torque is to be improved, only the diameters of the inner magnetic rotor and the outer magnetic rotor and the isolating sleeve and the lengths of the inner magnetic rotor, the outer magnetic rotor and the isolating sleeve are increased, and then the thickness of the isolating sleeve is required to be increased at the same time after the diameter of the isolating sleeve is increased (when the medium of the isolating sleeve is under pressure, the larger the diameter is, the thicker the wall thickness is required, and when the medium in the isolating sleeve is under negative pressure, the thickness is required to be increased in order to prevent the air shrinkage), the thickness of the isolating sleeve is increased, the magnetic gap between the inner magnetic rotor and the outer magnetic rotor is increased, and the magnetic induction intensity of the magnetic steel is required to be increased to ensure the torque, so that the eddy current loss is increased. If the length of the inner rotor, the outer rotor and the isolation cover is not increased after the diameter of the isolation sleeve is reduced, the magnetic induction intensity is required to be increased in order to ensure the same torque, and the eddy current loss is increased by a quadratic geometric progression due to the increase of the magnetic induction intensity, which is generally not preferable; and after the diameter of the isolation sleeve is reduced, the isolation sleeve is limited by the magnetic energy product of the magnetic steel, and the requirement of the same torque is difficult to achieve only by a method of increasing the magnetic flux. It is well known that minimizing eddy current losses can improve transmission efficiency, reduce energy consumption, and reduce a series of hazards caused by joule-lenz heat generation. When the torque of the existing magnetic driver is large, the eddy current loss accounts for about 10-25% of the total power consumption, and the eddy current loss is expected to be reduced by being made into a slender structure, and meanwhile, the large torque is expected to be realized; as mentioned above, this is difficult to achieve with existing cantilever structures. Professionals in the industry and university and research institutions have published many papers aimed at reducing eddy current loss, and all that is concluded is that the elongated structure is limited by the traditional cantilever structure, and if the elongated structure is made, the rigidity is small, the natural frequency is low, the use requirement cannot be met, and the elongated structure cannot be made too long, so that large torque cannot be realized. How to make a magnetic actuator of an elongated structure meeting the use requirements and at the same time to achieve a high torque is a big problem today.

(2) Vibration is easily generated. Because the cantilever end of the cantilever structure has small rigidity and low natural frequency, the magnetic coupling force of the inner magnetic steel and the outer magnetic steel is difficult to ensure uniformity everywhere, and the deflection of the inner magnetic rotor and the outer magnetic rotor is added to cause uneven magnetic coupling force and other factors, the vibration of equipment and the noise are easily caused, the health of people is influenced, the energy consumption is increased, the service life and the reliability of the equipment are reduced, and the maintenance cost is increased. Vibrations can accelerate demagnetization of the magnetic steel, also can reduce the service life and reliability of the device, and increase maintenance cost.

(3) The bearing is easily damaged. As the cantilever structure causes the large deflection, large vibration, even loss of dynamic balance and other factors of the inner magnetic rotor, the bearing is more easily damaged, so that the service life of the bearing is influenced.

(4) The internal cooling circuit is complex. The existing magnetic driver has the problem of complex internal structure including a cooling circuit, and the large number of parts not only results in high manufacturing cost, but also is particularly suitable for corroding media. The inlets and outlets of the internal cooling circuit are respectively positioned in the positive pressure area and the negative pressure area, and the inlet and outlet parts are easy to block, so that the pressure of the inlet and outlet parts needs to be balanced, otherwise, the flow of the medium entering the isolation sleeve needs to be increased, and the efficiency of the pump is reduced.

Furthermore, when the two ends of the inner rotor shaft are provided with bearings and the inner rotor is positioned between the two bearings, the current cooling circuit cannot meet the use requirement.

As shown in fig. 15, a magnetic pump manufactured by flowshow corporation in the united states has a simple structure, and a cooling circuit is also simple, and the disadvantages of the magnetic pump at least include:

the shaft is fixed on the end cover of the isolation sleeve, and the end of the isolation sleeve is cantilevered; meanwhile, the inner magnetic rotor and the impeller are integrated and are located on bearings, and one bearing is located at the cantilever end of the fixed shaft; to reduce the effects of vibration, the spacer and the shaft must have sufficient rigidity, and the diameter, wall thickness, and diameter of the spacer must be sufficiently large, which would undoubtedly cause an increase in eddy current loss; in this case, the rigidity of the structure and the energy saving are obviously a pair of contradictions that are not adjustable.

Chinese patent "a magnetic pump" (grant publication No. CN 207178276U) discloses a structure in which the inner magnetic rotor is not cantilevered, however, there are at least the following problems with this structure:

bearing supports are arranged between the transmission shaft (corresponding to the shaft of the inner magnetic rotor) and the bottom of the isolation sleeve (corresponding to the isolation sleeve cover plate), but as with the equipment, the vibration problem can not be solved under the condition that the vibration problem is solved under the condition that the bearing is easily damaged and the service life of the whole equipment is easily influenced; therefore, according to the technical specification of petrochemical engineering non-sealing centrifugal pump engineering of the petrochemical industry standard SHT 3148-2007 in China, the structure cannot be adopted.

Therefore, although the inner rotor is designed into a few cantilever or no cantilever structure, the cantilever structure still exists in the whole corresponding equipment (such as a magnetic pump and the like), so that the inner rotor cannot meet the related standard requirements, and most importantly, the inner rotor cannot fundamentally solve the problems in the prior art, cannot effectively ensure the safe reliability of use, and cannot achieve the effects of energy conservation and environmental protection.

Disclosure of Invention

In view of the problems of the prior art, the present invention is directed to a magnetic actuator with few or no cantilevers that effectively overcomes the various problems of the prior art.

The technical solution of the invention is realized as follows:

a few cantilever or no cantilever magnetic driver comprising: the motor comprises an inner magnetic rotor, a spacer sleeve, an outer magnetic rotor and a motor; the inner magnetic rotor, the isolation sleeve and the outer magnetic rotor are sleeved from inside to outside; an outer rotor of the outer magnetic rotor is connected with a driving shaft; the isolation sleeve is connected with the pump body at the opening end of the isolation sleeve; bearings a for supporting the inner rotor are respectively arranged between the inner walls of the opening end and the closed end of the isolation sleeve and the inner rotor of the inner magnetic rotor ₁ ，a ₂ The method comprises the steps of carrying out a first treatment on the surface of the The method is characterized in that:

the inner rotor is a transmission shaft;

The isolating sleeve is provided with an extending shaft outside the end cover at the closed end of the isolating sleeve, and the extending shaft is coaxially fixed with the isolating sleeve and supported by a supporting structure.

The drive shaft is typically referred to as the shaft of the motor or the output shaft of the gearbox when the motor is connected to the gearbox.

In one embodiment, the drive shaft is arranged parallel to the inner rotor, which is coupled to the drive shaft at its fixed end by a flexible transmission;

the supporting structure is a cylindrical bracket, and the cylindrical bracket comprises a cylindrical main body, a stepped cylindrical bottom and a base;

the cylindrical main body is sleeved on the periphery of the outer magnetic rotor, is fixed with the pump body at the near-pump end of the cylindrical main body, and is respectively provided with bearings c for supporting the outer rotor at the positions of the inner wall of the cylindrical main body corresponding to the two ends of the outer wall of the outer rotor _1· Bearing c ₂ ；

The extension shaft is sleeved in the stepped barrel bottom, the stepped barrel bottom comprises a thick-diameter pipe section and a thin-diameter pipe section, the thick-diameter pipe section and the barrel-shaped main body can be fixed by adopting a flange, and the thin-diameter pipe section is in transition fit with the extension shaft sleeved in the thick-diameter pipe section and the barrel-shaped main body;

the base is supported or fixed on the ground, the wall body and the like and is fixedly connected with the cylindrical main body or is simultaneously fixedly connected with the cylindrical main body and the stepped cylinder bottom.

Specifically, the flexible transmission device is in belt transmission or chain transmission, a driving wheel of the flexible transmission device is fixed on the driving shaft, a driven wheel of the flexible transmission device is fixed on the outer rotor, and a large-diameter pipe section of the stepped barrel bottom is correspondingly provided with an inlet and an outlet of a transmission belt or a transmission chain.

More specifically, an oil drain port can be arranged below the cylindrical support, and a plug is arranged on the cylindrical support.

Thus, the cantilever problem of the outer rotor and the isolation sleeve can be solved at the same time.

In the scheme, the driving shaft is arranged in parallel with the driving shaft serving as the inner rotor, so that the requirement of the equipment on coaxiality is effectively reduced, a series of problems such as vibration, noise, energy consumption and associated magnetic steel demagnetization aggravation and the like caused by the problems are avoided, the safety and reliability are effectively improved, the service life of the equipment is prolonged, the corresponding cost is reduced, and the method has the meaning of environmental protection. Meanwhile, the bearing is not in direct contact with the isolation sleeve, so that corresponding cooling and lubricating measures, various problems caused by the corresponding cooling and lubricating measures and corresponding cost are avoided.

In another scheme, the driving shaft is coaxially arranged with the inner rotor by adopting a cylindrical hollow shaft structure and is connected with the outer rotor through a coupler;

The extension shaft is sleeved in the hollow shaft structure of the driving shaft, a part of shaft section extends out of the driving shaft, and the supporting structure is supported on the extending shaft section of the extension shaft.

The support structure is a fixed bracket. Specifically, if the support structure which is supported or fixed on the ground, the wall body and the like is adopted, the support and the matching of the extension shaft can be realized by arranging the structure such as a shaft hole which is in clearance fit with the extension shaft (the clearance fit is the effect of taking the thermal expansion into consideration), the support of the isolation sleeve is correspondingly realized, and the cantilever problem of the isolation sleeve is solved accordingly.

In a third aspect, the drive shaft is arranged coaxially with the inner rotor; and is connected with the outer rotor through a coupler;

the extension shaft is sleeved in the outer rotor or the coupler; the support structure is a bearing b arranged between the inner wall of the outer rotor or the coupler and the extension shaft, one or more bearings b can be arranged, and the closed end of the isolation sleeve is used for supporting the isolation sleeve and the extension shaft.

Thus, the cantilever problem of the isolation sleeve is effectively solved.

Specifically, according to the length, thickness and wall thickness of the isolation sleeve, more than 1 bearing b can be arranged in consideration of specific rigidity requirements; when the bearings b are provided 2 or more, they are usually spaced apart from each other at a distance.

Considering the space for placing the bearing b and reducing the size of the bearing, the outer diameter of the extension shaft is smaller than the outer diameter of the spacer end cap.

Also, the bearing a ₁ ，a ₂ The outer diameter of the transmission shaft corresponding to the position is smaller than that of the middle section of the transmission shaft, namely the shaft section of which the outer wall is fixed with magnetic steel or the bearing a corresponding to the transmission shaft ₁ 、a ₂ A shaft section therebetween.

And further, when the diameter of the middle section of the transmission shaft is larger, the middle section of the transmission shaft can be set to be a hollow structure in view of saving materials and reducing weight, and a coaxial cylindrical cavity structure is generally adopted.

Further, in order to solve the cantilever problem of the outer rotor, a bearing c for supporting the outer rotor is provided at one end of the outer rotor near the pump.

Specifically, the following cases may be included:

case (i): the bearing c is arranged between the inner wall of the outer rotor near one end of the pump and the isolation sleeve. Similarly, considering the installation space of the bearing c, the outer diameter of the isolating sleeve corresponding to the position of the bearing c is smaller than the outer diameter of the middle section of the isolating sleeve, namely the axial section of the isolating sleeve corresponding to the magnetic steel of the inner magnetic rotor and the outer magnetic rotor.

Case (ii): the bearing seat c of the bearing c is fixedly connected to and supported by the flange at the opening end of the isolation sleeve, and the bearing seat c is coaxially sleeved outside the outer rotor.

Case (iii): the magnetic driver also comprises an outer isolation sleeve which is sleeved on the periphery of the outer magnetic rotor, the pump end of the outer isolation sleeve is connected with the isolation sleeve and the pump body in a flange manner, and the other end of the outer isolation sleeve is connected with the outer end cover in a flange manner to form a closed end;

the inner wall of the outer isolation sleeve near the pump end is fixedly connected with a bearing bracket c of the bearing c, and the bearing bracket c is coaxially sleeved outside the outer rotor;

the closed end of the outer isolation sleeve is provided with a coaxial shaft sleeve in the outer end cover, and the shaft sleeve is sleeved with the extension shaft;

and magnetic steel is correspondingly arranged on the outer rotor at the position of the fixed end of the outer rotor close to the outer end cover and the corresponding position of the coupler close to the outer end cover, and the outer rotor is connected with the driving shaft by means of the magnetic attraction of the magnetic steel.

In order to lubricate the corresponding bearings, the outer isolation sleeve is filled with lubricating oil; generally, white oil or perfluoropolyether lubricating oil is adopted in consideration of the explosion-proof requirement;

furthermore, in order to find the leakage of the isolation sleeve early, a sensor is arranged on the outer isolation sleeve, and the sensor adopts a temperature sensor, a pressure sensor, a liquid level sensor and the like.

Further, considering the cooling requirement of the lubricating oil, fins for heat dissipation are arranged on the inner wall and the outer wall of the outer isolation sleeve.

The addition of an outer spacer (hereinafter also referred to as a secondary spacer with respect to the spacer between the inner and outer rotors) aims at further preventing leakage, and in general, the spacer between the inner rotor and the outer rotor (hereinafter also referred to as a primary spacer, and the separate reference to the spacer in the present invention refers to only this primary spacer) is relatively thin, and if the medium is corrosive or has particles inside (which are generally difficult to avoid), it is easy to corrode or abrade the primary spacer to cause leakage; the secondary isolation cover can prevent or avoid the medium from further leaking to the outside, and the sensor comprising a temperature sensor, a pressure sensor or a liquid level sensor and the like is further arranged in the secondary isolation cover, so that the leakage condition of the primary isolation cover can be timely monitored and the parking maintenance is reminded through corresponding temperature, pressure or liquid level and other parameter feedback.

Specifically, the bearing a ₁ ，a ₂ The bearing seat is arranged on the inner wall of the isolation sleeve flange and the inner wall of the isolation sleeve end cover; alternatively, the spacer flange and spacer end cap correspond to the bearing a ₁ ，a ₂ The inner wall of the position is the bearing a ₁ ，a ₂ For example, when the inner diameter of the spacer is small and the corresponding bearing installation space is limited;

likewise, the bearing b may also include a bearing seat disposed on an inner wall of the outer rotor or an inner wall of the coupling; or when the inner diameter of the outer rotor near the motor end or the corresponding shaft coupling is smaller, the inner wall of the outer rotor or the shaft coupling corresponding to the position b of the bearing is a corresponding bearing seat;

similarly, in the case (i) where the bearing c is provided, the bearing c may include a bearing housing provided on an inner wall of the outer rotor; or for example, when the inner diameter of the outer rotor far away from one end of the motor is smaller, the inner wall of the outer rotor corresponding to the position c of the bearing is the corresponding bearing seat.

Furthermore, the magnetic driver can further comprise a compression-resistant structure, and the compression-resistant structure is formed by coating the outside of the isolation sleeve with a carbon fiber coating layer or an aramid fiber coating layer, so that the capacity of the isolation sleeve for bearing the internal pressure is improved.

Further, in order to cool the isolation sleeve and parts and lubrication rotating parts in the isolation sleeve, the magnetic driver further comprises a cooling and lubrication loop, wherein the cooling and lubrication loop comprises a pipeline, an internal through hole and a lubrication gap which are sequentially communicated from a cooling liquid outlet to form a through loop;

The inner through hole is arranged in the axial direction of the structure through which the cooling liquid flows into the lubricating gap from the pipeline or in the direction parallel to the axial direction; an extension shaft section and an inner through hole spacer end cap section comprising at least an inner through hole, and an inner through hole bearing a in this order ₂ Bearing a with segment and internal through hole ₁ A segment; through holes respectively formed along the axes of the extending shaft and the end cover of the isolating sleeve and arranged on the bearing a ₂ 、a ₁ A groove penetrating along a direction parallel to the axis thereof;

the lubricating gap comprises an axial gap, a radial gap and a bearing a between the isolating sleeve and the inner magnetic rotor ₂ 、a ₁ Radial clearance between the inner rotor and the spacer bush.

One end of the pipeline is communicated with the cooling liquid inlet, and the other end of the pipeline is communicated with the internal through hole: the corresponding cooling liquid flows through the inner through hole from the pipeline, then flows into the lubrication gap communicated with the inner through hole, realizes cooling and lubrication of the isolation sleeve and the inner parts thereof and the like, and finally flows out from the outlet of the cooling liquid.

Furthermore, a crushing device for crushing solid particles in the cooling liquid is also arranged in the cooling and lubricating loop, and the crushing device is arranged between the bearing a positioned at the closed end of the isolation sleeve and the end cover of the isolation sleeve.

The crushing device aims at preventing solid particles in the medium from blocking a cooling and lubricating loop, and simultaneously avoiding the solid particles in the medium from forming rolling between the inner rotor and the isolation sleeve to damage the inner rotor or the isolation sleeve and avoiding the abrasion of solid particles to the outer sheath and the isolation sleeve of the inner rotor.

The crushing device can be a rotary crushing cutter fixed on the inner side of the transmission shaft and/or the end cover of the isolating sleeve, and is similar to a grinding structure of a traditional stone grinder or meat grinder structure.

Specifically, when the outer rotor is connected with the motor shaft through the coupler according to different application occasions, the driving shaft section of the internal through hole is the motor shaft section of the internal through hole, namely the section of the through hole is formed along the axis of the motor shaft; when the motor is connected with the gearbox, the outer rotor is connected with the output shaft of the gearbox through the coupler, and the driving shaft section of the internal through hole is the gearbox shaft section of the internal through hole, namely the section of the through hole is formed along the axis of the output shaft of the gearbox.

Specifically, the bearing a of the inner through hole ₁ Bearing a with segment and internal through hole ₂ The segments respectively include along the bearing a ₁ ，a ₂ A group of grooves penetrating in parallel to the axial direction are circumferentially arranged on the inner surface of the bearing.

Further, the pipeline is located outside (the outside refers to the outside of the outer isolation sleeve, and in the case that the magnetic driver is not provided with the outer isolation sleeve, the outside refers to the outside of the outer rotor), and a pipe section (hereinafter also referred to as an outer pipe section) is provided with radiating fins so as to reduce the medium temperature in the cooling and lubricating loop; in order to further improve the heat dissipation effect, reduce the flow of the loop and reduce the efficiency loss, the outer pipe section is divided into two pipe sections, and a large-size fin heat exchanger is connected between the two pipe sections.

Compared with the prior art, the invention has the advantages that:

(1) The problem of the cantilever that magnetic actuator includes interior magnetic rotor, spacer bush and outer magnetic rotor including has really been solved, it is safer to use, more reliable: in the present invention, the closed end (usually a cantilever end structure in the prior art) where the spacer end cover is located is supported by the fixed end of the outer rotor or the corresponding coupling through the bearing by means of the extension shaft structure fixedly connected with the spacer end cover, in which case, the two ends of the inner magnetic rotor are supported by the spacer (including the end cover of the closed end and the flange of the open end) through the bearing respectively, which becomes a feasible and reliable solution: further, the near pump end of the outer rotor (typically designed as a cantilever structure in the prior art) avoids cantilever problems by means of bearings mounted between the outer rotor and the radial direction of the spacer; better, in order to ensure the accommodating space of the bearing, the whole structure is more reasonable, practical and safe by properly adjusting the size of the corresponding shaft diameter, for example, the diameter of the extension shaft is smaller than the outer diameter of the end cover of the isolation sleeve; for another example, the outer diameter of the spacer sleeve corresponding to the proximal end of the outer rotor is smaller than the outer diameter of the middle section.

Therefore, in the technical scheme of the invention, besides the support of the driving shaft (which can be a motor shaft or a gearbox output shaft) and external equipment (such as a pump), the transmission shaft, the isolation sleeve and the outer rotor are mutually supported to effectively solve the cantilever problem of the corresponding inner rotor, the isolation sleeve and the outer rotor by the simplest structure, thereby solving the worldwide problem which is urgent to be solved by people at present.

If the isolation sleeve is not cantilevered, the conventional method is as follows: the cantilever ends of the spacer are fixed by the brackets, which can cause interference between the brackets and the outer rotor, so that the outer rotor cannot rotate. The invention skillfully solves the problem.

(2) Realize energy saving and consumption reduction, and has outstanding environmental protection benefit: the invention realizes the structure of less cantilever or no cantilever of the inner magnetic rotor and the isolation sleeve, which enables the slender magnetic driver to be made possible, and correspondingly, the slender magnetic driver can greatly reduce eddy current loss, has outstanding energy-saving benefit and obviously reduces the emission of three wastes. The following are illustrated:

the empirical formula for eddy current loss is:

P _w ＝KTLN ² B ₀ ² r ³ m/R (1)

wherein: pw-magnetic eddy current loss, K-complex constant, T-spacer wall thickness, L-magnetization length, B0-magnetic induction, R-spacer radius, m-magnet group number, R-resistivity.

The radius of the isolation sleeve is respectively 100 and 50 for comparison analysis one by one, after the radius is reduced from 100 to 50, the original torque M is changed into 1/2M, and after the radius is reduced by one time, the magnetic steel on the inner magnetic rotor and the outer magnetic rotor is correspondingly reduced by half, and the original torque M is changed into 1/4M. In order to keep the original torque unchanged, 4 magnetic force actuators with the radius reduced by one time are needed to be connected in series, and the corresponding eddy current loss calculation and ratio are as follows:

(1) calculating the radius r by the formula (1) ₁ Eddy current loss PL 100=100:

PL100＝KTLN ² B ₀ ² r ₁ ³ m/R＝100 ³ KTLN ² B ₀ ² m/R

(2) calculating the radius r by the formula (1) ₂ =50, eddy current loss PL50 with half reduced number of magnet groups:

PL50＝KTLN ² B ₀ ² r ₁ ³ m/R＝50 ³ KTLN ² B ₀ ² m/2R

(3) calculating the eddy current loss ratio of the two:

(4) under the same torque, 4 radii r are needed ₂ Magnetic drive of =50, the corresponding eddy current loss needs to be multiplied by 4.

The calculation in summary shows that: the radius of the isolating sleeve is doubled, and the ratio of eddy current loss of the magnetic force driver for obtaining the same torque is 4;1, the influence amplitude of the thickness of the isolation sleeve on the eddy current loss is large enough.

The following formula for calculating the eddy current loss is given in a paper entitled "calculation of eddy current loss of magnetic drive spacer sleeve" in journal 3 of modern machinery 2008:

for purposes of unity, several original letters in this formula are converted against the previous formula. Comparative analysis was performed in the same manner as above according to this formula, with the conclusion that: in the case of a spacer diameter reduced by half and the same torque, the eddy current loss can be reduced by nearly half.

Taking a 37KW magnetic pump as an example, the eddy current loss is calculated according to 15 percent of the eddy current loss, the eddy current loss is 5.55KW, and the radius is halved, the eddy current loss is calculated according to the original 52 percent, namely: the eddy current loss is 5.55×52% = 2.886, the eddy current loss is reduced by 5.55-2.886 = 2.664KW, and the electric power per year is saved by 2,664 ×8600 = 22910 degrees calculated by pumping for 8600 hours per year. After the diameter of the isolation sleeve is reduced, the wall thickness of the isolation sleeve is allowed to be thinned, so that the eddy current loss is further reduced: after the wall thickness of the isolation sleeve is reduced, the distance between the inner magnetic steel and the outer magnetic steel is reduced, and the magnetic induction intensity of the magnetic steel can be reduced under the same torque, so that the eddy current loss is further reduced, and if the eddy current loss is calculated, the eddy current loss can be reduced by more than 60%. After the eddy current loss is reduced, the generated heat is small, and the flow of the medium which is pumped into the isolation sleeve for cooling is proportionally reduced, so that the efficiency of the pump is improved, and the energy is further saved and the consumption is reduced. The magnetic pump and the magnetic stirrer are used all over the world at home and abroad, and the use amount is large, so that the use is undoubted; therefore, if the invention can be widely accepted and effectively applied, the meaning and the effect of the invention on energy conservation, consumption reduction and environmental protection are undoubtedly far-reaching and huge: as known, a power plant is built, and funds, land, energy, manpower and the like need to be solved, and the emission problems of waste water, waste residue and waste gas are unavoidable, so that the application of the invention obviously reduces the cost; thus, the present invention is said to benefit humans from no sense of deficiency.

(3) Damping loss reduction, safety and reliability are higher: based on the structure with few cantilevers and even no cantilevers, the natural frequency is improved, and the deflection is reduced; meanwhile, no matter the inner rotor, the isolation sleeve or the outer rotor can be made thinner, the corresponding linear speed is reduced, so that the vibration is greatly reduced, the rapid damage of the bearing is greatly reduced, the service life of the whole equipment including the bearing is prolonged, and the safety and the reliability of production are ensured.

(4) The manufacturing process and the debugging process are simplified, and the cost is reduced: as described above, the inner magnetic rotor of the conventional structure is supported by the two bearings in the spacer, one end of the spacer is of a cantilever structure, and the spacer cannot be made too thin and the wall thickness cannot be made too thin for securing rigidity, which limits the minimum diameter of the conventional structure. The inner magnetic rotor is not required to be made into a cylinder with larger diameter, and the magnetic steel is attached to the transmission shaft to form the inner magnetic rotor, so that the cylinder of the inner magnetic rotor is removed, and the manufacturing cost is reduced; because the diameter is small, the structure that the inner walls of the isolation sleeve, the outer rotor and the coupler are used as bearing seats can be adopted, the structure is simpler, parts and procedures are greatly reduced, and the cost is greatly reduced; and the diameter of the isolation sleeve is small, so that the isolation sleeve is not easy to collapse. Meanwhile, the transmission shaft is an inner rotor, the diameter is small, the centrifugal force is small, the magnetic steel is not easy to separate or damage, more importantly, larger vibration is not easy to generate, and even the complicated procedures of dynamic balance and static balance of the inner magnetic rotor can be omitted, so that the cost is further reduced.

(5) The cooling and lubricating circuit is simple, and the cooling and lubricating effect is obvious: compared with the cooling and lubricating system in the prior art, the cooling and lubricating circuit disclosed by the invention has the advantages of simple and reasonable structure, scientific and ingenious design, and particularly positive pressure is adopted at the medium pressure position in the isolation sleeve, so that the cooling and lubricating effects of all parts are ensured; furthermore, the water cooler is replaced by a fin radiating mode, and a series of problems such as pipeline heat preservation, heat tracing and operation energy consumption when the water cooler is adopted, circulation beating when cooling water is frozen, scaling of the water cooler and the like can be avoided.

And on the premise of simple structure of the cooling and lubricating loop, the internal structure of the whole equipment is ensured to be simple, the isolation sleeve is used for replacing the bearing seat with a longer and thicker traditional structure, corresponding parts are more simplified, the manufacturing cost and the raw material cost are greatly reduced, and particularly when the cooling and lubricating loop is used for corrosive media, the corresponding cost saving is more outstanding.

The invention can be widely applied to the equipment such as the prior magnetic pump, the magnetic stirrer and the like, replaces the prior magnetic driver with large eddy loss and easy vibration, is safe and energy-saving, and solves the technical problems which are long desired to be solved for many years. When the magnetic driver is used vertically, the requirements can be met by increasing the size or rigidity of the frame.

Drawings

Fig. 1 is a schematic structural view of embodiment 1 according to the present invention;

fig. 2 is a schematic structural view of embodiment 2 according to the present invention;

fig. 3 is a schematic structural view of embodiment 3 according to the present invention;

fig. 4 is a schematic structural view of embodiment 4 according to the present invention;

fig. 5 is a schematic structural view of embodiment 5 according to the present invention;

fig. 6 is a schematic structural view of embodiment 6 according to the present invention;

FIG. 7 is a schematic illustration of a hollow shaft section of a midsection of a propeller shaft in accordance with an embodiment of the invention;

FIG. 8 is a schematic diagram of a fin heat exchanger cooling a lubrication circuit according to an embodiment of the present invention;

FIG. 9 is a sliding bearing a according to an embodiment of the present invention ₁ ，a ₂ Is a front view of (a);

FIG. 10 is a cross-sectional F-F view of FIG. 9;

FIG. 11 is a schematic view of a magnetic actuator in a vertical use configuration according to an embodiment of the present invention;

fig. 12 is a schematic structural view of embodiment 7 according to the present invention;

fig. 13 is a schematic structural view of embodiment 8 according to the present invention;

FIG. 14 is a schematic view of a structure commonly employed in prior art magnetic pumps;

fig. 15 is a schematic diagram of a magnetic pump from a company in the united states.

In the figure:

1. pump with a pump body

2a ₁ Bearing a ₁ 2a ₂ Bearing a ₂ 2b,2b '. Bearing b, b ' 2c,2c '. Bearing c 2c ₁ Bearing c ₁ ，2c ₂ Bearing c ₂

2a ₁ -1，2a ₂ -1. Bearing a ₁ Bearing a ₂ Is provided with a bearing seat

2c ₁ -1，2c ₂ -1. Bearing c ₁ Bearing c ₂ Is provided with a bearing seat

3. Outer rotor 3-1. Magnetic steel 3-2,3-2'. Magnetic steel

4. Spacer 4-1, spacer flange 4-2, spacer end cap 4-3, extension shaft 4-4, bearing seat c

5. Hollow shaft section of transmission shaft 5-1, magnetic steel 5-2

6. Outer isolation sleeve 6-1,6-1'. Outer isolation sleeve flange 6-2. Outer end cover 6-21. Outer end cover flange 6-3. Extension shaft sleeve

6-4 bearing support c 6-5 fin

7. Coupling 7-1,7-1' magnetic steel

8. Pipeline 8-1,8-2. Two pipe sections 8-3a of pipeline, fin 8-3b, fin heat exchanger

9-1. Motor shaft section 9-1' of internal through-hole. Stepped barrel bottom section 9-2 of internal through-hole, extension shaft section 9-3 of internal through-hole, spacer end cap section 9-4 of internal through-hole, bearing a of internal through-hole ₂ Section 9-5 bearing a with internal through hole ₁ Segment(s)

10. Motor 10-1. Motor shaft

11. Fastening piece

12a, a base 12b, a frame 12-1, and a fixing bracket

13. Crushing device

14. Sensor for detecting a position of a body

15. Oil drain hole

16. Driving wheel 16-1. Driving wheel extension sleeve

17. Transmission chain or belt

18. Cylindrical support 18-1, cylindrical main body 18-2, stepped cylindrical bottom 18-3, base

19. Driven wheel 19-1 driven wheel extension sleeve

A. Cooling liquid inlet

B. Cooling liquid outlet

Detailed Description

The present invention will now be described in further detail with reference to examples.

Example 1

A magnetic actuator, as shown in fig. 1, comprising: an inner magnetic rotor formed by a transmission shaft 5 and magnetic steel 5-1, an outer magnetic rotor formed by an outer rotor 3 and magnetic steel 3-1, a spacer sleeve 4, a base 12a and a motor 10, wherein the inner wall of a spacer sleeve end cover 4-2 at the closed end of the spacer sleeve 4 or the inner wall of the spacer sleeve 4 close to the spacer sleeve end cover 4-2 is provided with a bearing seat 2a coaxial with the transmission shaft 5 ₂ The open end of the isolating sleeve 4 is an isolating sleeve flange 4-1, the isolating sleeve flange 4-1 is fixedly connected with the pump 1 through a fastener 11, and the inner wall of the isolating sleeve flange 4-1 is a bearing seat 2a coaxial with the transmission shaft 5 ₁ -1, the bearing housing 2a ₁ -1、2a ₂ Bearing 2a is respectively arranged in the-1 ₁ 、2a ₂ The two ends of the transmission shaft 5 are respectively sleeved on the bearing 2a ₁ 、2a ₂ In, the bearing 2a ₁ 、2a ₂ The magnetic steel 5-1 is fixed (e.g. stuck) on the transmission shaft 5 (also called as transmission shaft middle section 5-2);

meanwhile, an extension shaft 4-3 is arranged outside the isolation sleeve end cover 4-2, the extension shaft 4-3 is coaxial with the isolation sleeve 4, is fixed outside the isolation sleeve end cover 4-2, is sleeved in the outer rotor 3, and has an outer diameter smaller than the outer diameter of the isolation sleeve end cover 4-2; bearings 2b,2b ' are arranged on the extending shaft 4-3, corresponding to the bearing seats matched with the inner wall of the outer rotor 3, the bearings 2b,2b ' are sleeved in the bearing seats, and the two bearings 2b,2b ' are axially separated by a distance, when the rigidity of the isolation sleeve 4 is good, only one bearing 2b can be arranged, as shown in fig. 3, 4, 5 and 6.

The outer rotor 3 is coupled and fixed to the coupling 7 fixed to the motor shaft 10-1 by a fastener 11, so that the end of the outer rotor 3 coupled and fixed to the coupling 7 is referred to as a fixed end of the outer rotor 3.

When the inner diameters of the two ends of the isolation sleeve 4 are smaller, the isolation sleeve 4 can be directly used for corresponding to the bearing 2a ₁ ，2a ₂ The inner walls of the two ends of the bearing seat.

Therefore, the magnetic driver is a structure without cantilever ends of the inner magnetic rotor and the isolation sleeve.

For cooling the isolation sleeve, the isolation sleeve inner part and the lubrication rotating part, the magnetic driver further comprises a cooling and lubrication loop, as shown in fig. 1, from a cooling liquid outlet, comprising a pipeline 8, an internal through hole and a lubrication gap which are communicated in sequence;

the inner through hole includes a motor shaft section 9-1 of the inner through hole (in this case, the outer rotor 3 is connected to the motor shaft 10-1 through the coupling 7), a driving shaft section of the inner through hole is the motor shaft section 9-1 of the inner through hole, an extension shaft section 9-2 of the inner through hole, a spacer end cap section 9-3 of the inner through hole and a bearing a of the inner through hole ₂ Section 9-4 and bearing a with internal through hole ₁ 9-5;

the lubricating gap comprises an axial gap, a radial gap and a bearing a between the isolating sleeve 4 and the inner magnetic rotor ₁ ，a ₂ Radial clearance between the transmission shaft and the isolation sleeve;

one end of the pipe 8 (motor shaft section 9-1 having an outer diameter smaller than the inner through hole) communicates with the coolant inlet A; the other end of the cooling liquid is connected to the extended shaft section 9-2 of the inner through hole through the motor shaft section 9-1 of the inner through hole, and the cooling liquid flows into the pipe 8 from the cooling liquid inlet A, flows through the motor shaft section 9-1 of the inner through hole, the extended shaft section 9-2 of the inner through hole and the end cover section 9-3 of the spacer sleeve of the inner through hole, and enters the lubrication gap and the bearing a of the inner through hole connected to the lubrication gap ₂ Section 9-4 and bearing a with internal through hole ₁ Section 9-5, flows out through coolant outlet B. In fig. 1, the arrow in fig. 2 shows that the cooling medium is tapped from the medium outlet of the pump 1, flows through the cooling and lubrication circuit from the inlet a of the cooling and lubrication circuit and finally flows back into the pump via the outlet B of the circuit.

In order to reduce the temperature of the medium in the cooling and lubricating loop, the pipeline 8 is arranged on a pipe section (hereinafter also referred to as an outer pipe section) outside the outer rotor, and radiating fins 8-3a are arranged on the pipe section; or in order to further improve the heat dissipation effect, reduce the flow rate of the loop and reduce the efficiency loss, a fin heat exchanger 8-3b with a larger size can be connected to the outer tube segment, and correspondingly, the outer tube segment can be divided into two segments, namely a tube segment 8-1 and a tube segment 8-2, and the fin heat exchanger 8-3b is installed between the two tube segments 8-1 and 8-2 of the pipeline, as shown in fig. 2, 4, 5 and 6.

Bearing a of said inner through hole ₁ Section 9-5 and bearing a with internal through hole ₂ Sections 9-4 are each included along the bearing a ₁ ，a ₂ A set of grooves extending circumferentially parallel to the axial direction are provided circumferentially on the inner surface of the housing as shown in fig. 9 and 10.

Example 2

A magnetic actuator, as shown in fig. 2, similar to the magnetic actuator described in embodiment 1, comprising: an inner magnetic rotor formed by a transmission shaft 5 and magnetic steel 5-1, a spacer sleeve 4, an outer magnetic rotor formed by an outer rotor 3 and magnetic steel 3-1, a base 12a and a motor 10; the inner magnetic rotor, the isolation sleeve 4 and the outer magnetic rotor are sleeved from inside to outside and are coaxially arranged with the motor shaft 10-1 integrally; the outer rotor 3 is connected with a shaft 10-1 of the motor at a fixed end thereof through a coupler 7; the isolation sleeve 4 is connected with the pump 1 at the opening end thereof through a flange 4-1 thereof; and also comprises bearings 2a arranged at two ends of the transmission shaft 5 and used for supporting the transmission shaft ₁ ，2a ₂ And bearings 2b,2b' provided between the extension shaft 4-3 outside the spacer cover 4-2 and the fixed end of the outer rotor 3 to support the spacer 4; the magnetic drive further includes a cooling lubrication circuit, and as in embodiment 1, the cooling lubrication circuit includes a pipe, an internal through hole, and a lubrication gap.

Unlike example 1, in example 2, the fins 8-3a were replaced with the fin heat exchangers 8-3b of a larger size, as described above, to achieve the effects of improving the heat radiation effect, reducing the flow rate of the circuit, and reducing the efficiency loss.

The other main difference from embodiment 1 in embodiment 2 is that in embodiment 2 there is further provided a crushing device 13, said crushing device 13 being for crushing solid particles in the cooling medium of the cooling and lubrication circuit, and being provided in the bearing 2a at the closed end of the spacer sleeve 4 ₂ And the end cover 4-2 of the isolating sleeve.

As mentioned before, the arrangement of the crushing device 13 aims at preventing solid particles in the cooling medium from blocking the cooling lubrication circuit, at the same time avoiding that the solid particles in the cooling medium form rolling between the inner rotor (i.e. the drive shaft 5 in the present invention) and the spacer sleeve 4, damaging the inner rotor or the spacer sleeve 4, and avoiding that the solid particles wear the outer jacket of the inner rotor and the spacer sleeve 4.

The crushing device 13 may typically employ a roller crushing mechanism similar to a conventional stone mill or meat grinder mechanism, such as a rotary crushing cutter secured to the inside of the drive shaft and/or spacer end cap 4-2.

Example 3

A magnetic actuator, as shown in fig. 3, similar to the magnetic actuator described in embodiment 1, comprising: an inner magnetic rotor formed by a transmission shaft 5 and magnetic steel 5-1, a spacer sleeve 4, an outer magnetic rotor formed by an outer rotor 3 and magnetic steel 3-1, a base 12a and a motor 10; the inner magnetic rotor, the isolation sleeve 4 and the outer magnetic rotor are sleeved from inside to outside and are coaxially arranged with the motor shaft 10-1 integrally;

In substantial agreement with embodiment 1, the outer rotor 3 is connected at its fixed end with a fastener 11 to the shaft 10-1 of the motor through a coupling 7; the isolation sleeve 4 is connected with the pump 1 through a flange 4-1 at the opening end of the isolation sleeve; bearings 2a are respectively arranged between the inner walls of the opening end and the closing end of the isolation sleeve 4 and the transmission shaft 5 of the inner magnetic rotor ₁ 2a for supporting the drive shaft 5 ₂ The method comprises the steps of carrying out a first treatment on the surface of the The spacer sleeve 4 is flanged to its end cap 4-2 at its closed end (slightly different from example 1, example 1 has no flange at the closed end of the spacer sleeve); the spacer end cap 4-2 is provided with an extension shaft 4-3 outside as in embodiment 1, but unlike embodiment 1, embodiment 3 employs a bearing 2b provided between the inner wall of the coupling 7 and the extension shaft 4-3 for support of the spacer 4 at the end of the extension shaft 13.

In this embodiment, unlike embodiment 1, a bearing 2c is further disposed between the inner wall of the outer rotor 3 near one end of the pump and the spacer 4, and when the inner diameter of the outer rotor 3 is smaller, the inner wall of the outer rotor 3 may be used as a corresponding bearing seat; the bearing 2c provides support for the outer magnetic rotor near the pump end.

Therefore, the whole magnetic driver (comprising the inner magnetic rotor, the isolation sleeve and the outer magnetic rotor) has no cantilever structure, and the rigidity of the whole structure is greatly improved, so that the corresponding shaft and the shaft sleeve comprise the transmission shaft 5, the isolation sleeve 4, the outer rotor 3 and the like can be made to be more slender, a series of problems caused by large eddy current loss and the like are solved or greatly weakened, the magnetic driver is safer and more reliable, is more energy-saving and environment-friendly, and the cost including use and maintenance and the raw material and processing cost and the like are correspondingly greatly reduced.

Example 4

A magnetic actuator, as shown in fig. 4, has a similar overall structure to that of embodiment 2, except that it mainly comprises:

firstly, it is provided with a bearing 2b for supporting the closed end of the spacer 4, in example 2 here two bearings 2b,2b' are provided;

secondly, a bearing 2c' is further arranged at the near pump end of the outer magnetic rotor, and although the purpose of the arrangement is that the bearing 2c is used for supporting the outer magnetic rotor as in the bearing 2c in the embodiment 3, the rigidity of the system is improved, but the arrangement position and the supporting mode are different from those of the bearing 2c in the embodiment 3: the bearing seat c4-4 is fixedly connected to and supported by the flange 4-1 at the opening end of the isolation sleeve 4, the bearing seat c4-4 is coaxially sleeved outside the outer rotor 3, and the bearing 2c' is arranged between the bearing seat c4-4 and the outer rotor 3.

Example 5

As shown in fig. 5, an outer spacer 6 is added to the magnetic actuator according to embodiment 2, so as to adjust the structure, and the magnetic actuator mainly comprises:

(1) The outer isolation sleeve 6 is sleeved on the periphery of the outer magnetic rotor, the pump-proximal end of the outer isolation sleeve is connected with the isolation sleeve 4 through an isolation sleeve flange 4-1 and an outer isolation sleeve flange 6-1, and the other end of the outer isolation sleeve is connected with the outer isolation sleeve flange 6-1' through an outer end cover flange 6-21 to form a closed end;

(2) The bearing 2 c' for supporting the outer rotor 3 is arranged between the bearing bracket c6-4 and the outer rotor 3, the bearing bracket c6-4 is coaxially sleeved outside the outer rotor 3 and is fixed and connected on the inner wall of the outer isolation sleeve 6 near the pump end;

(3) The outer isolation sleeve 6 is further provided with an extension shaft sleeve 6-3 in an outer end cover 6-2 thereof, and the extension shaft sleeve 6-3 is coaxial with the outer isolation sleeve 6 and sleeved with the extension shaft so as to improve and ensure the rigidity of the isolation sleeve 4;

(4) The outer rotor 3 is correspondingly and respectively provided with a magnetic steel 3-2 and a magnetic steel 7-1 at the positions of the fixed end of the outer rotor 3 close to the outer end cover 6-2 and the corresponding positions of the coupler 7 close to the outer end cover 6-2, specifically, the magnetic steel 3-2 and the magnetic steel 7-1 are respectively arranged at the opposite shaft side end parts of the outer rotor 3 and the coupler 7, and a certain angle is formed according to the radian of the corresponding positions of the outer end cover 6-2; the outer rotor 3 is coupled with the motor shaft 10-1 through a coupling 7 by means of magnetic attraction between the magnetic steel 3-2 and the magnetic steel 7-1.

(5) A sensor 14 is further arranged on the outer isolation sleeve 6, and the sensor 14 can be a temperature sensor, a pressure sensor or a liquid level sensor; the sensor 14 is used for timely monitoring the leakage condition of the isolation sleeve 4 and reminding the parking maintenance through corresponding parameter feedback such as temperature, pressure or liquid level.

(6) The outer spacer 6 is filled with lubricating oil in view of lubrication obtained by including the bearing 2c ", etc.; and considering the explosion-proof requirement, white oil or perfluoropolyether lubricating oil is generally adopted;

(7) Considering the cooling requirement of lubricating oil, fins 6-5 for heat dissipation are arranged on the inner wall and the outer wall of the outer isolation sleeve 6;

(8) The outer pipe section of the pipeline 8 of the cooling and lubricating circuit correspondingly refers to a pipe section arranged at the periphery of the outer isolation sleeve 6.

Example 6

As shown in fig. 6, the overall structure of the magnetic actuator is the same as that of embodiment 5, and the main difference is that the positions of the magnetic steels 3-2 'and 7-1' for magnetically connecting the outer rotor 3 and the coupling 7 (and thus the motor shaft 10-1) are slightly different from those of embodiment 5: specifically, the magnetic steel 3-2 'and the magnetic steel 7-1' are respectively arranged at corresponding positions of the outer rotor 3 and the radial outer edge and the radial inner wall of the coupler 7, and the outer rotor 3 is connected with the motor shaft 10-1 through the coupler 7 by means of magnetic attraction between the magnetic steel 3-2 'and the magnetic steel 7-1'.

In the magnetic force transmission device according to the above embodiment, when the diameter of the inner rotor (i.e., the transmission shaft 5 in the present invention) (particularly, the diameter of the middle section 5-2 thereof) is large, in order to save raw materials and reduce the weight of the structure, the middle section of the transmission shaft is provided with a hollow shaft section, and the hollow shaft section 5-2 is coaxial with the whole of the transmission shaft 5, as shown in fig. 7.

In order to improve the internal pressure resistance of the spacer 4, a non-metallic material such as carbon fiber or aramid fiber may be coated on the spacer 4 to form a coating layer (not shown).

For the motor shaft section of the internal through hole of the cooling and lubrication circuit, in some cases, when the motor is connected to the gearbox and then to the outer rotor through the coupling, the driving shaft section of the internal through hole is the gearbox shaft section of the internal through hole, and the internal through hole is a through hole formed along the axis of the output shaft of the gearbox, that is, the gearbox shaft section of the pipeline passing through the internal through hole is connected to the extension shaft section of the internal through hole (not shown in the figure).

The magnetic actuator of the present invention can also be used in a vertical configuration, including the above embodiments, as shown in fig. 11, and the corresponding usage requirements can be generally satisfied by increasing the size or rigidity of the frame 12 b.

Example 7

A magnetic actuator, as shown in fig. 12, comprising: an inner magnetic rotor formed by a transmission shaft 5 and magnetic steel 5-1 coaxially sleeved from inside to outside, an outer magnetic rotor formed by an outer rotor 3 and magnetic steel 3-1, a separation sleeve 4, a cylindrical bracket 18 with a floor support, a base 12a, a motor 10 and the like;

as in example 1, the inner wall of the spacer cover end cap at the closed end of the spacer 4 or the inner wall of the spacer cover 4 near the spacer cover end cap is provided with a bearing seat 2a coaxial with the transmission shaft 5 ₂ -1, the open end of the spacer 4 is flanged to the pump 1The inner wall of the isolating sleeve flange 4-1 is a bearing seat 2a coaxial with the transmission shaft 5 ₁ -1, the bearing housing 2a ₁ -1、2a ₂ Bearing 2a is respectively arranged in the-1 ₁ 、2a ₂ The two ends of the transmission shaft 5 are respectively sleeved on the bearing 2a ₁ 、2a ₂ In, the bearing 2a ₁ 、2a ₂ The magnetic steel 5-1 is fixed (for example, stuck) on the shaft section (namely, the middle section of the transmission shaft) of the transmission shaft 5;

the inner rotor is a transmission shaft 5; in this case, unlike embodiment 1, the drive shaft 5 is arranged parallel to the motor 10 shaft, both of which are driven by a drive belt or drive chain 17; the support of the outer rotor and spacer distal pump end is achieved in dependence of the cylindrical support 18.

Specifically, the cylindrical support 18 includes a cylindrical main body 18-1, a stepped cylindrical bottom 18-2, and a base 18-3; the cylindrical main body 18-1 is sleeved on the outer periphery of the outer rotor 3, the pump near end of the cylindrical main body is fixedly connected with the pump body 1 through a flange, and bearings 2c for supporting the outer rotor 3 are respectively arranged at the positions of the inner wall of the cylindrical main body corresponding to the two ends of the outer wall of the outer rotor 3 ₁ Bearing 2c ₂ The method comprises the steps of carrying out a first treatment on the surface of the Corresponding bearing seats 2c can also be provided ₁ -1，2c ₂ -1, the bearing housing 2c ₁ -1，2c ₂ -1 are fixed to the inner walls of said tubular body 18-1, respectively;

in this way, the support of the outer rotor 3 is achieved, and the cantilever problem of the outer rotor is solved.

The extension shaft 4-3 is sleeved in the stepped barrel bottom 18-2, the stepped barrel bottom 18-2 comprises a thick-diameter pipe section and a thin-diameter pipe section, the thick-diameter pipe section and the barrel-shaped main body 18-1 can be fixed by adopting flanges, and the thin-diameter pipe section is in transition fit with the extension shaft 4-3 sleeved therein;

the base 18-3 is supported or fixed on the ground, a wall body and the like, and is fixedly connected with the cylindrical main body 18-1 or is simultaneously fixedly connected with the cylindrical main body 18-1 and the stepped cylindrical bottom 18-2;

in this way, the support of the extension shaft 4-3, i.e. the distal pump end of the spacer 4, is achieved, i.e. the spacer cantilever problem is solved.

The transmission structure of the transmission shaft 5 and the shaft of the motor 10 comprises a driving wheel 16, a driven wheel 19 and a transmission belt or a transmission chain 17, wherein the driving wheel 16 is nested and fixed with the motor shaft 10-1 through an extension sleeve 16-1, the driven wheel 19 is nested and fixed with the distal pump end of the outer rotor 3 through an extension sleeve 19-1, and a large-diameter pipe section of the stepped barrel bottom 18-2 is correspondingly provided with an inlet and outlet of the transmission belt or the transmission chain 17.

An oil drain hole 15 is arranged below the cylindrical bracket 18, and a plug 15 is arranged on the oil drain hole.

Likewise, for cooling the spacer sleeve, the spacer sleeve inner part and the lubrication rotating part, the magnetic driver can further comprise a cooling and lubrication loop, wherein the cooling and lubrication loop starts from the cooling liquid inlet A and comprises a pipeline 8, an internal through hole and a lubrication gap which are sequentially communicated, and a through loop is formed from the cooling liquid inlet A to the cooling liquid outlet B;

the inner through hole comprises a stepped barrel bottom section 9-1' of the inner through hole, an extension shaft section 9-2 of the inner through hole, a spacer end cap section 9-3 of the inner through hole, and a bearing a of the inner through hole in this order ₂ Section 9-4 and bearing a with internal through hole ₁ 9-5; through holes respectively formed along the axes of the stepped barrel bottom 18-2, the extension shaft and the end cover 4-2 of the 4-3-isolating sleeve and arranged on the bearing a ₂ 、a ₁ A groove penetrating along a direction parallel to the axis thereof;

the lubricating gap comprises an axial gap, a radial gap and a bearing a between the isolating sleeve 4 and the inner magnetic rotor ₂ 、a ₁ Radial clearance with the inner rotor (i.e. drive shaft 5) and spacer sleeve 4;

one end of the pipeline 8 is communicated with the cooling liquid inlet A, and the other end of the pipeline is connected into the extension shaft section 9-2 of the inner through hole from the stepped barrel bottom section 9-1' of the inner through hole; so that the cooling liquid flows from the cooling liquid inlet into the pipeline 8, through the stepped barrel bottom section 9-1' of the inner through hole, into the extension shaft section 9-2 of the inner through hole and the spacer end cap section 9-3 of the inner through hole, into the lubrication gap and the bearing a of the inner through hole communicating with the lubrication gap ₂ Section 9-4 and bearing a with internal through hole ₁ Section 9-5, flow through outlet B of the coolantAnd (5) outputting.

Likewise, according to specific working conditions and needs, the cooling and lubrication circuit may also be provided with a crushing device and fins or fin heat exchangers, etc., and the transmission shaft 5 may also be designed into a hollow structure according to specific structures, stresses, etc., as shown in fig. 7, which is not repeated herein.

Example 8

A magnetic actuator, comprising: an inner magnetic rotor formed by a transmission shaft 5 (also called an inner rotor) and magnetic steel 5-1, an outer magnetic rotor formed by an outer rotor 3 and magnetic steel 3-1, a separation sleeve 4 and a motor 10, wherein the inner magnetic rotor, the separation sleeve 4 and the outer magnetic rotor are coaxially sleeved from inside to outside; the opening end of the isolating sleeve is connected with the pump body flange, and the outer part of the isolating sleeve end cover 4-2 at the other end of the isolating sleeve is provided with a coaxial extension shaft 4-3.

Unlike the previous one, the motor shaft 10-1 is arranged coaxially with the transmission shaft 5 by adopting a cylindrical hollow shaft structure and is connected with the outer rotor 3 through a coupling 7;

the outer diameter of the extension shaft 4-3 is smaller than the inner diameter of the hollow shaft structure of the motor shaft 10-1, the extension shaft is sleeved in the hollow shaft structure of the motor shaft, a part of shaft section extends out of the motor, and a supporting structure is arranged on the extending shaft section of the extension shaft 4-3 to support.

The support structure is a fixed bracket 12-1 which is supported and fixed on the ground, and can correspondingly arrange a shaft hole in clearance fit with the extension shaft 4-3 to support and cooperate with the extension shaft 4-3, so that the support of the isolation sleeve 4 is realized, and the cantilever problem of the isolation sleeve is correspondingly solved.

The inner wall of the isolating sleeve end cover 4-2 at the closed end of the isolating sleeve 4 or the inner wall of the isolating sleeve 4 close to the isolating sleeve end cover 4-2 is provided with a bearing seat 2a coaxial with the transmission shaft 5 ₂ -1, the inner wall of the spacer flange 4-1 at the open end of the spacer 4 is provided with a bearing seat 2a coaxial with the transmission shaft 5 ₁ -1, the bearing housing 2a ₁ -1、2a ₂ Bearing 2a is respectively arranged in the-1 ₁ 、2a ₂ The two ends of the transmission shaft 5 are respectively sleeved on the bearing 2a ₁ 、2a ₂ In, obviously, said bearing 2a ₁ 、2a ₂ The two ends of the transmission shaft (also the inner rotor) are supported by the isolation sleeve, so that the cantilever problem of the inner rotor is solved;

also, considering the cooling requirements of the isolation sleeve and the parts in the isolation sleeve and the lubrication requirements of the rotating parts, the magnetic driver can also comprise a cooling and lubrication circuit, wherein the cooling and lubrication circuit starts from a cooling liquid inlet A and comprises a pipeline 8, an internal through hole and a lubrication gap which are communicated in sequence, and a through circuit is formed from the cooling liquid inlet A to a cooling liquid outlet B;

The inner through hole comprises an extension shaft section 9-2 of the inner through hole, a spacer end cap section 9-3 of the inner through hole, and a bearing a of the inner through hole in this order ₂ Section 9-4 and bearing a with internal through hole ₁ 9-5; through holes respectively formed along the axes of the extension shaft 4-3 and the isolation sleeve end cover 4-2 and arranged on the bearing a ₂ 、a ₁ A groove penetrating along a direction parallel to the axis thereof;

the lubricating gap comprises an axial gap, a radial gap and a bearing a between the isolating sleeve 4 and the inner magnetic rotor ₂ 、a ₁ Radial clearance with the inner rotor (i.e. drive shaft 5) and spacer sleeve 4;

one end of the pipeline 8 is communicated with the cooling liquid inlet A, and the other end is communicated with the extension shaft section 9-2 of the internal through hole; so that the cooling liquid flows from the cooling liquid inlet A into the pipe 8, flows through the extended shaft section 9-2 of the inner through hole and the spacer end cap section 9-3 of the inner through hole, and enters the lubrication gap and the bearing a of the inner through hole communicating with the lubrication gap ₂ Section 9-4 and bearing a with internal through hole ₁ Section 9-5, flows out through outlet B of the cooling liquid.

Likewise, the cooling and lubrication circuit may further be provided with a crushing device 13 and a fin or fin heat exchanger 8-3b, and the structure and function thereof are as described above and are not repeated here.

It should be apparent that the above-described embodiments are merely some, but not all, embodiments of the present invention. On the basis, any technical scheme obtained by equivalent substitution or change of the technical scheme and the invention concept according to the technical scheme and the invention without creative labor within the technical scope of the invention disclosed by the invention is covered by the protection scope of the invention.

Claims (16)

1. A few cantilever or no cantilever magnetic driver comprising: the motor comprises an inner magnetic rotor, a spacer sleeve, an outer magnetic rotor and a motor; the inner magnetic rotor, the isolation sleeve and the outer magnetic rotor are sleeved from inside to outside; an outer rotor of the outer magnetic rotor is connected with a driving shaft; the isolation sleeve is connected with the pump body at the opening end of the isolation sleeve; bearings a for supporting the inner rotor are respectively arranged between the inner walls of the opening end and the closed end of the isolation sleeve and the inner rotor of the inner magnetic rotor ₁ ，a ₂ The method comprises the steps of carrying out a first treatment on the surface of the The method is characterized in that:

the inner rotor is a transmission shaft;

the isolating sleeve is provided with an extending shaft outside the end cover at the closed end of the isolating sleeve, and the extending shaft is coaxially fixed with the isolating sleeve and supported by a supporting structure.

2. A few-cantilever or cantilever-less magnetic driver according to claim 1, wherein:

The middle section of the transmission shaft is of a hollow structure.

3. A few-cantilever or cantilever-less magnetic driver according to claim 1, wherein:

the driving shaft is arranged in parallel with the inner rotor, and the outer rotor is connected with the driving shaft at the fixed end of the outer rotor through a flexible transmission device;

the supporting structure is a cylindrical bracket, and the cylindrical bracket comprises a cylindrical main body, a stepped cylindrical bottom and a base;

the cylindrical main body is sleeved on the periphery of the outer magnetic rotor, is fixed with the thick-diameter pipe section of the stepped cylinder bottom at the far pump end, is fixed with the pump body at the near pump end, and is provided with bearings c for supporting the outer rotor at the positions corresponding to the two ends of the outer wall of the outer rotor at the inner wall ₁ Bearing c ₂ ；

The extension shaft is sleeved in the stepped barrel bottom and is in transition fit with the small-diameter pipe section of the stepped barrel bottom.

4. A few-cantilever or cantilever-less magnetic driver according to claim 3, wherein:

the flexible transmission device is in belt transmission or chain transmission, a driving wheel of the flexible transmission device is fixed on the moving shaft, a driven wheel of the flexible transmission device is fixed on the outer rotor, and an inlet and an outlet of a transmission belt or a transmission chain are correspondingly arranged on a thick-diameter pipe section of the stepped barrel bottom.

5. A few-cantilever or cantilever-less magnetic driver according to claim 1, wherein:

the driving shaft is coaxially arranged with the inner rotor by adopting a cylindrical hollow shaft structure and is connected with the outer rotor through a coupler;

the extension shaft is sleeved in the hollow shaft structure of the driving shaft, a part of shaft section extends out of the driving shaft, and the supporting structure is supported on the extending shaft section of the extension shaft.

6. The few-cantilever or cantilever-less magnetic driver of claim 5, wherein:

the support structure is a fixed bracket.

7. A few-cantilever or cantilever-less magnetic driver according to claim 1, wherein:

the driving shaft is coaxially arranged with the inner rotor and is connected with the outer rotor through a coupler;

the extension shaft is sleeved in the outer rotor or the coupler; the support structure is a bearing b arranged between the inner wall of the outer rotor or the coupler and the extension shaft.

8. The few cantilever or no cantilever magnetic driver according to claim 7, wherein:

the device also comprises a bearing c for supporting the outer rotor, and the bearing c is arranged at one end of the outer rotor near the pump.

9. The few-cantilever or cantilever-less magnetic driver of claim 8, wherein:

The bearing c is arranged between the inner wall of the outer rotor near one end of the pump and the isolation sleeve.

10. The few-cantilever or cantilever-less magnetic driver of claim 8, wherein:

the bearing seat c of the bearing c is fixedly connected to and supported by the flange at the opening end of the isolation sleeve, and the bearing seat c is coaxially sleeved outside the outer rotor.

11. The few-cantilever or cantilever-less magnetic driver of claim 8, wherein:

the outer isolating sleeve is sleeved on the periphery of the outer magnetic rotor, the pump near end of the outer isolating sleeve is connected with the isolating sleeve and the pump body through flanges, and the other end of the outer isolating sleeve is connected with the outer end cover through flanges to form a closed end;

the inner wall of the outer isolation sleeve near the pump end is fixedly provided with a bearing bracket c connected with the bearing c, and the bearing bracket c is coaxially sleeved outside the outer rotor;

the closed end of the outer isolation sleeve is provided with a coaxial shaft sleeve in the outer end cover, and the shaft sleeve is sleeved with the extension shaft;

and magnetic steel is correspondingly arranged on the outer rotor at the position of the fixed end of the outer rotor close to the outer end cover and the corresponding position of the coupler close to the outer end cover, and the outer rotor is connected with the driving shaft by means of the magnetic attraction of the magnetic steel.

12. The few cantilever or no cantilever magnetic driver according to claim 11, wherein:

the outer isolation sleeve is provided with a sensor, and the sensor adopts a temperature sensor, a pressure sensor or a liquid level sensor.

13. A few-cantilever or no-cantilever magnetic driver according to claims 1-12, wherein:

the cooling and lubricating loop is started from the cooling liquid outlet and comprises a pipeline, an internal through hole and a lubricating gap which are sequentially communicated, and a through loop is formed from the cooling liquid outlet;

the inner through hole is arranged on the axial direction of the structure through which the cooling liquid flows from the pipeline into the lubricating gap or the direction parallel to the axial direction, and comprises at least an extension shaft section of the inner through hole, a spacer end cover section of the inner through hole, and a bearing a of the inner through hole ₂ Bearing a with segment and internal through hole ₁ A segment; through holes respectively formed along the axes of the extending shaft and the end cover of the isolating sleeve and arranged on the bearing a ₂ 、a ₁ A groove penetrating along a direction parallel to the axis thereof;

the lubricating gap comprises an axial gap, a radial gap and a bearing a between the isolating sleeve and the inner magnetic rotor ₂ 、a ₁ Radial clearance between the inner rotor and the spacer bush.

14. The few-cantilever or no-cantilever magnetic driver according to claim 13, wherein:

bearing a of said inner through hole ₁ Bearing a with segment and internal through hole ₂ The segments respectively include along the bearing a ₁ ，a ₂ A group of grooves penetrating in parallel to the axial direction are circumferentially arranged on the inner surface of the bearing.

15. The few-cantilever or no-cantilever magnetic driver according to claim 13, wherein:

also comprises a crushing device for crushing solid particles in the cooling liquid, which is arranged on the bearing a positioned at the closed end of the isolating sleeve ₂ And the end cover of the isolation sleeve.

16. The few-cantilever or no-cantilever magnetic driver according to claim 13, wherein:

and the pipeline is provided with a radiating fin or a fin heat exchanger.