KR100978824B1 - Driving motor, especially for a pump - Google Patents

Abstract

A drive motor 12 is disclosed, in particular for a pump, with a rotor 14 with a drive shaft 20 and a stator 14 surrounded by a stator casing 26 surrounded by an outer casing 36. The stator casing 26 and the outer casing 36 are sealed to be sealed and form an intermediate space 38 that is filled by the cooling fluid 42. The cooling fluid 42 is actively moved by the cooling water impeller 48. For that purpose, the coolant impeller 48 is coupled to the drive shaft 20 of the electric drive motor 12 by a permanent magnet coupling 52 in the form of synchronous coupling, hysteretic coupling or eddy current coupling. do.

Description

Driving motor, especially for a pump

In pumps, the delivered, ie pumped medium is typically used directly as cooling water for the drive motor of the pump. When dealing with sewage or waste water or other contaminated fluids he may lead to blockage of the cooling volume of the drive motor. Also known are pumps, in particular sewage pumps, with internal cooling systems for drive motors. In such an arrangement the circulation of the coolant is carried out by an additional small coolant impeller. Such coolant impeller may be operatively connected to a small electric motor. Another possible option involves directly driving the compact coolant impeller described above by means of a pump drive motor. In such a case, the coolant impeller is combined with the pump impeller and provided at the free end of the drive shaft of the drive motor, or the drive shaft of the drive motor extends laterally from its free shaft end and the coolant impeller is laterally away from the pump impeller. It can be located at. In such known pumps, irrespective of the individual arrangement of the coolant impeller, the coolant circuit needs to be sealed by a dynamic seal in relation to the drive motor and possibly the transported medium, ie sewage. Dynamic seals, however, are subject to leakage and cannot be reliably ruled out. Such leaks pose, for example, risks such as failure of the cooling system or penetration of cooling water into the drive motor in extreme cases.

CH 614 760 A5 is provided with a magnetic coupling provided with a bar-shaped permanent magnet positioned in parallel with one another in parallel with its axis on its outer side surrounding the can and surrounded by the can. A canned centrifugal pump is provided. The inner coupling portion of the pump casing, cand centrifugal pump and magnetic coupling is heat and / or acid resistant to provide a strong gland-less chemical cand centrifugal pump that provides reliable operational protection from corrosion. It is desirable to have acid resistant plastic materials. Side and cross section of the permanent magnet completely enclosed in the inner coupling part cover. Bearing material is contained in the plastic material in the region of the bearing surface of the interconnected component of the magnetic coupling. In such known cand centrifugal pumps, the permanent magnet coupling serves to mechanically connect the pump drive motor to the pump impeller.

Cand centrifugal pumps with permanent magnet coupling are known, for example, from DE 33 37 086 C2. Such known centrifugal pumps with a magnetic coupling have a can cup of plastic material with reinforcement in at least its axial can area. The can cup of plastic material is surrounded from the outside by a cup-shaped jacket of high quality steel that serves as a shape stabilizer and a holder for the can. In this case also a permanent magnet is provided for connecting the pump drive motor to the pump impeller, in that respect a plastic material having the maximum possible stability and good heat dissipation from the can cup area, even at the high pressure and high temperature of the respective transferred medium. Cans cup is possible.                 

DE 36 39 719 C3 discloses a canned magnet pump having a pump casing, a pump impeller and a magnetic coupling having an outer drive and an inner rotation magnetically connected thereto, wherein the outer drive and the inner rotation are sealed to each other by a can cup. It is sealed. Partial flow of the discharge flow of the canned motor pump branching from the delivery flow and functioning to lubricate the pump plain bearings and possibly dissipating heat losses from the magnet coupling and bearing heat to the can cup Passes through the interior of the. The end near the pump, which is a tubular part of the can cup, has a connecting flange which projects from the axis of rotation of the magnetic coupling and which is coupled to the pump casing. The can cup can be subject to the operation of a heating means independent of the medium being transferred to provide a canned magnet pump which is relatively simple to manufacture but enjoys a relatively wide range of use at both high and low temperatures of the medium being transferred. And the can cup provides an increased degree of safety in an accident or breakdown situation. For that purpose, in known canned magnetic pumps, at least two tubular portions of the can cup have at least a double wall configuration, and at least two concentrically arranged with respect to each other and to the low axis of the magnetic coupling. Formed by two can walls. The inner wall space formed by the double or multi wall structure serves to receive the heating or cooling medium. Provided in the connection flanges that are mechanically rigid and sealed to the can wall are at least one feed passage leading to the inner wall space and at least one discharge path for the heating medium and cooling water. In this known canned magnet pump, the magnetic coupling also functions to operatively connect the drive motor to the pump impeller.                 

DE 43 19 619 A1 discloses a submersible motor drive pump with an electric drive motor, at the bottom of which a casing of the centrifugal pump is fixed, the casing of the drive motor being coaxially on the outside by means of a cooling jacket through which the medium to be transferred flows. surrounded. In this case, the transferred or pumped medium is used as cooling water, which can result in blockage of the cooling jacket when treating sewage or wastewater or other contaminated fluid as described above in the disclosure herein. Such blockages lead to overheating of the drive motor and, in extreme cases, to a total failure.

DE 44 34 461 A1 discloses a submersible motor driven pump for massively contaminated fluids. In order to allow for the cleaning of deposits inside the pump, the submerged motor drive pump provided with a tangential pressure connection and the jacket space in which the transmitted fluid flows around the drive motor are arranged at the end of the jacket space, i.e. far from the pump. It has a flushing connection, and the same height connection is connected to the external fluid supply. The same height connection is preferably provided with a releasably fixed closure cap provided with a ventilation system. It represents structural complexity and expense that cannot be ignored.

A cooling device for the cooling of underwater mud, sewage and sludge motor drive pumps for the purpose of dry installation is known from DE 196 40 155 A1. Such known cooling devices represent an independent configuration without a fixed structural connection to the submersible motor driven pump.

DE 298 14 113 U1 discloses a permanent magnet coupling pump with a pump arrangement having a rotor (rotor) arranged in a can cup and connected to a driver of the drive, the driver extending around the can cup and means of the drive motor. Followed by rotation. Such known permanent magnet coupling pumps have a cage connected at one end to the puff device and at the opposite end to a drive motor. The driver and the drive motor are operatively connected by a drive means of material that is a weak conductor of heat. The drive means may be in the form of a coupling or may have a coupling inserted in a drive shaft provided between the driver and the drive motor. The coupling may be in the form of dog coupling, elastomer coupling or permanent magnet coupling.

It is an object of the present invention to provide a drive motor, especially for a pump, which has a statically sealed and sealed internal cooling system.

Such an object is achieved according to the invention by the features of claim 1. Preferred configurations and improvements of the drive motor according to the invention are characterized in the dependent claims.

The drive motor according to the invention has the advantage that the risk of clogging the cooling system of the drive motor is eliminated by not having direct contact with the transported medium, such as sewage or waste water or other contaminated fluid. Another fairly important advantage is that dynamic seals are avoided so that the resulting leak effect is reliably eliminated. In the drive motor according to the invention, the permanent magnet coupling does not function to connect the drive shaft of the drive motor to the pump impeller, but instead connects the drive shaft of the drive motor to the coolant impeller of the sealed seal system of the electric drive motor. Function to connect.

The cooling system according to the invention can be used not only in relation to pumps, in particular sewage or waste water pumps, but also in relation to any electric drive motor with a sealingly sealed cooling system. Instead of the pump impeller, it is also possible to provide or mount any other known mechanical components on the drive shaft of the electric drive motor, such as belt pulleys, V belt pulleys, serrated belt pulleys and the like.

Further details, features and advantages will be apparent from the following description of the embodiment shown for purposes of illustration in the drawings of a drive motor according to the invention for a pump, in particular a sewage or wastewater pump.

In the drawing,

1 shows a longitudinal cross-sectional view of a first embodiment of a pump with permanent magnet coupling between a drive shaft of an electric drive motor and a statically sealed sealed coolant impeller of the drive motor.

FIG. 2 shows an enlarged view of the top of the drive motor of FIG. 1 for yet another improved illustration of a permanent magnet coupling in the form of a synchronous coupling.

FIG. 3 shows a view in longitudinal section similar to FIG. 1 of a second embodiment of a drive motor of a pump, in particular a sewage or wastewater pump, with another configuration of permanent magnet coupling formed by synchronous coupling.                 

4 is an enlarged view of the top of the drive motor of FIG. 3 for yet another improved illustration of a permanent magnet coupling in the form of a synchronous coupling.

5 is a longitudinal axis similar to FIGS. 1 and 3 of a third embodiment of a pump, in particular a sewage or wastewater pump, formed by a synchronous coupling but having a permanent magnet coupling provided on the drive shaft between the rotor and the pump impeller of the drive motor; The state of the cross section is shown.

FIG. 6 shows an enlarged view of the lower part of FIG. 5, in particular for another improved illustration of the synchronous coupling.

FIG. 7 has a permanent magnet coupling between the coolant impeller and the drive shaft of the electric drive motor, the permanent magnet coupling having a longitudinal cross section similar to FIGS. 1, 3 and 5 of a fourth embodiment of a pump formed by hysteretic coupling. Shows the appearance.

FIG. 8 shows an enlarged view similar to FIGS. 2, 4 and 6, in order to further illustrate the hysteretic coupling.

FIG. 9 shows a view in longitudinal section similar to FIGS. 1, 3, 5 and 7 of a fifth embodiment of a pump with permanent magnet coupling formed by eddy current coupling. FIG.

FIG. 10 shows another improved illustration of eddy current coupling between a drive shaft of an electric drive motor of a permanent magnet coupling in the form of a synchronous coupling and a coolant impeller of a sealed sealed sealed system of the electric drive motor. The upper part of 9 is enlarged and shown.

 1 is a view in longitudinal section of a pump 10, in particular a sewage or wastewater pump. The pump 10 has an electric drive motor 12 with a stator 14 and a rotor 16. The winding end of the stator winding of the stator 14 is indicated by reference numeral 18. The rotor 16 is non-rotatively connected to the drive shaft 20. The drive shaft 20 has a front end portion 22 and a rear end portion 24 protruding away from each other beyond the rotor 16.

The stator 14 of the electric drive motor 12 is sealed and surrounded by a stator casing 26. The stator casing 26 has a cup-shaped main casing portion 28 and a front casing portion 30 sealedly connected thereto.

The drive shaft 20 of the electric drive motor 12 is dynamically supported at its rear end portion 24 by bearing elements 32 at the main casing portion 28 of the stator casing 26. The drive shaft 20 is also dynamically supported at its front end portion 22 by bearing elements 34 at the front casing portion of the stator casing 26.

The stator casing 26 is surrounded by an outer casing 36 spaced apart from the stator casing 26 such that an intermediate space 38 is provided between the stator casing 26 and the outer casing 36. The intermediate space 38 can be filled by the cooling fluid 42 through the filling opening 40. After the intermediate space 38 is completely filled with the cooling fluid 42, the filling opening 40 is hermetically sealed by the sealing element 44, thus sealingly sealed cooling system for the electric drive motor 12. Provide 46. The cooling fluid 42 provided in the intermediate space 38 of the sealed and sealed cooling system 46, in other words, during operation of the electric drive motor 12 to provide optimum cooling of the electric drive motor 12. It is actively moved by the coolant impeller 48 during the rotation of 16).

The coolant impeller 48 is rotatably mounted on the shaft 50 and is coupled, ie operatively, connected to the drive shaft 20 of the electric drive motor 12 by a permanent magnet coupling 52.

As can be seen in particular clear from FIG. 2, the permanent magnet coupling 52 comprises a first permanent magnet device 54 spaced from each other by a spacing 58 provided with a partition element 60. It is in the form of a synchronous coupling 53 having a second permanent magnet device 56. Splitting element 60 is provided with a non-magnetic material. The permanent magnet devices 54 and 56 are flat disk shaped configurations and are axially spaced from each other to form the spacing 58. The splitting element 60 is in the form of a plate element 62 which is sealed and fixed to an annular collar 64 of the main casing portion 28 of the stator casing 26. For that purpose, the dividing element 60 formed by the plate element 62 has a sealing relationship between the cap element 66 and the annular collar 64 of the main casing portion 28 of the stator casing 26. Is clamped. The shaft 50 for the coolant impeller is fixed between the cap element 66 and the plate or splitting elements 60, 62.

The annular collar 64 of the dividing element 60 formed by the plate element 62 and the main casing portion 28 of the stator casing 26 comprises a dry space portion in which the first permanent magnet device 54 is provided. 68). The first permanent magnet device 54 is fixed to a carrier 70, which is accurately positioned at the end of the rear end portion 24 of the drive shaft 20, i.e. in a way to avoid imbalance. It is centrally located and fixed.

As can be seen in FIG. 1, the pump impeller 72 is secured to the front end portion 22 of the drive shaft 20.

In the embodiment of the drive motor shown in FIGS. 1 and 2, the first permanent magnet device 54 and the second permanent magnet device 56 are formed from a coupling element of surface rotation of a flat disk annular disk configuration. . In comparison, FIGS. 3 and 4 show a pump 10 with a permanent magnet coupling 52 between the drive shaft 20 of the electric drive motor 12 and the coolant impeller 48, the first permanent magnet. The device 54 and the second permanent magnet device 56 are in the form of a central coupling element arranged in a concentric relationship with each other.

The annular first and annular second permanent magnet devices 54 and 56 are radially confined and spaced apart from each other, with a split element 60 in the form of a cup between them.

In this embodiment too, the splitting element 60 is sealed and clamped between the cap collar 66 and the annular collar 64 of the main casing portion 28 of the stator casing 26, thus providing a first permanent Provided is a dry space portion 68 in which the magnet device 54 is disposed.

The same details in FIGS. 3 and 4 are denoted by the same reference numerals as in FIGS. 1 and 2, so that all such features in the relationship with FIGS. 3 and 4 need not be described once again in detail.

5 and 6 show an embodiment of the drive motor of the pump, in which a permanent magnet coupling 52 with a coolant impeller 48 is provided as in the respective embodiments of FIGS. 1 and 2 and 3 and 4. The front end portion 22 of the drive shaft 20 is provided instead of at the rear end portion 24 of the drive shaft 20 of the electric drive motor 12. In this embodiment also the permanent locator coupling 52 is provided with a first permanent magnet device 54 and a second permanent magnet device 56 spaced from each other by an annular gap with the splitting element 60. In the form of a synchronous coupling 53 having. The first permanent magnet device 54 is fixed to the front end portion 22 of the drive shaft 20. The second permanent magnet device 56 is coupled or fixedly connected to the coolant impeller 48. The splitting element 60 is in the form of a cylindrical sleeve 74 secured to the front casing portion 30 of the stator casing 26 to provide a dry space portion 68.

In order to further enhance the cooling of the cooling fluid 42 provided in the sealed seal in the intermediate space 38, the casing portion 76 of the pump 10 is sealed and sealed and filled with the cooling fluid 42. And cooling ribs 78 protruding into 38. Cooling ribs 78 provide an increase in surface area and thus provide optimum cooling of cooling fluid 42.

The same features are identified in FIGS. 5 and 6 by the same reference numerals as in FIGS. 1 to 4, so that all such features need not be described once again in connection with FIGS. 5 and 6.

7 and 8 show an embodiment of the drive motor of the pump, in which the permanent magnet coupling 52 between the drive shaft 20 and the coolant impeller 48 of the electric drive motor 12 of the pump is a synchronous couple. Unlike the embodiment of the pump 10 shown in FIGS. 1 and 2 in that it is not in the form of a ring but in the form of a hysteresis coupling 80, the hysteresis coupling 80 is non-magnetic. The dividing element 60 having a (non-magnetisable) material has a hysteresis surface element 82 and a permanent magnet device 84 spaced apart from each other by the provided spacing 58. The permanent magnet device 84 is coupled to, or fixedly connected to, the coolant impeller 48. The hysteresis surface element 82 is fixedly connected to the drive shaft 20. The hysteretic surface element 82 has a magnetic material of relatively high residual remanence and relatively low coercive field strength, allowing magnetic reversal to a relatively low resistance. Although synchronous coupling does not exhibit any slip, hysteretic coupling has slip caused by the transmission mechanism of the coupling and consequently power consumption.

Except for the permanent magnet coupling 52, the pump 10 shown in FIGS. 1 and 2 and 7 and 8 has a similar configuration in principle, so that all the features are described in detail once again with reference to FIGS. Need not be.

9 and 10 show an embodiment of a drive motor of a pump 10 similar to the pump 10 shown in FIGS. 1 and 2 and shown in FIGS. 7 and 8. 10) an eddy current having an eddy current surface element 88 and a permanent magnet device 90, not formed by synchronous coupling (see FIGS. 1 and 2) or hysteretic coupling (see FIGS. 7 and 8). It has a permanent magnet coupling 52 formed by the coupling 86. The permanent magnet device 90 is fixedly connected to the coolant impeller 48. The eddy current surface element 88 is fixed to the drive shaft 20 of the electric drive motor 12. Eddy current surface element 88 is a surface element having a surface element 94 having a soft-magnetic material and electrically conductive material, such as copper, which are elements fixedly connected to one another, such as rivet fastening, for example. 92). Furthermore, the pump shown in FIGS. 9 and 10 has a similar configuration to the pumps shown in FIGS. 1 and 2 and 7 and 8, with reference to FIGS. 9 and 10 and need not be described in detail once again.

The same details are identified by the same respective reference numerals in FIGS. 1 to 10. 1, 3, 5, 7 and 9 also show a pump casing 73.

The coolant impeller 48 is shown in the drawing of an electric drive motor with a hermetically sealed cooling system 46 coupled to the drive shaft 20 of the drive motor 12 by a permanent magnet coupling 52. It will be understood that the invention is not limited in construction.

Claims (22)

A rotor 16 having a drive shaft 20, a stator 14 surrounded by a stator casing 26 surrounded by an outer casing 36, The stator casing 26 and the outer casing 36 themselves form a sealed intermediate space 38 which is fixedly closed and filled by the cooling fluid 42 which is actively moved by the cooling water impeller 48, The drive motor, characterized in that the coolant impeller (48) is connected to the drive shaft (20) by a permanent magnet coupling (52). The method of claim 1, The permanent magnet coupling 52 is a synchronous coupling having a first permanent magnet device 54 and a second permanent magnet device 56 spaced from each other by a gap 58 provided with a split element of a nonmagnetic material. (53), wherein the first permanent magnet device (54) is connected to the drive shaft (20) and the second permanent magnet device (56) is coupled to the coolant impeller (48). 3. The method of claim 2, The first permanent magnet device 54 is provided in the dry space portion 68 of the stator casing 26, which is sealed and closed by the splitting element 60 and from the intermediate space 38 filled with the cooling fluid 42. A drive motor, characterized in that separated. The method of claim 2 or 3, The first and second permanent magnet devices 54 and 56 are flat disk shaped configurations and are face rotational coupling elements axially spaced apart from each other, and the first and second permanent magnets. The drive motor, characterized in that the dividing element 60 provided in the axial plane spacing 58 between the devices 54 and 56 is in the form of a plate element 62 which is securely fixed to the stator casing 26. . The method of claim 2 or 3, The drive motor, characterized in that the first and second permanent magnet arrangements (54 and 56) are of annular configuration and are arranged coaxially with respect to one another and in the form of a central coupling element. The method of claim 5, The drive motor, characterized in that the dividing element 60 provided in the radially annular gap 58 between the first and second permanent magnet devices 54 and 56 is cup-shaped sealed to the stator casing 26. . The method of claim 2 or 3, The dividing element 60 provided in the radially annular gap 58 between the first and second permanent magnet devices 54 and 56 is shaped like a cylindrical sleeve 74 secured to the stator casing 26. Characterized in that the drive motor. The method of claim 1, The permanent magnet coupling 52, which is in the form of a hysteretic coupling 80 with the permanent magnet device 84 and the hysteretic surface element 82, is provided with a spacing 58 provided with a splitting element 60 of non-magnetic material. Has a relatively high residual remanence and relatively low coercive field strength of the magnetic material, and the hysteretic surface element 82 is connected to the drive shaft 20 or has a coolant impeller ( And a permanent magnet device (84) coupled to the cooling water impeller (48) or connected to the drive shaft (20). The method of claim 8, The hysteretic surface element 82 is in the dry space portion 68 of the stator casing 26 sealed and closed by the splitting element 60 and spatially separated from the intermediate space 38 filled with the cooling fluid 42. Drive motor, characterized in that provided. The method according to claim 8 or 9, The hysteretic surface element 82 and the permanent magnet device 84 are face-rotating coupling elements of a disk-shaped configuration of relationally flat surfaces that are axially spaced apart from each other. Drive element, characterized in that it is in the form of a plate element (62) secured to the stator casing (26). The method according to claim 8 or 9, The hysteretic surface element 82 and the permanent magnet arrangement 84 are of annular configuration and in the form of a central coupling element in a concentrically arranged relationship. The method of claim 11, The splitting element 60 provided in the radially annular gap 58 between the hysteretic surface element 82 and the permanent magnet device 84 is characterized in that it is a cup-shaped sealably fixed to the stator casing 26. motor. The method of claim 11, The dividing element 60 provided in the radially annular gap 58 between the hysteretic surface element 82 and the permanent magnet device 84 is a cylindrical sleeve shape 74 that is sealably fixed to the stator casing 26. A drive motor, characterized in that. The method of claim 1, The permanent magnet coupling 52 is in the form of an eddy current coupling with the permanent magnet device 90 and the eddy current surface element 88, the surface element 92 facing towards the permanent magnet device 90 and electrically conductive A surface element 94 provided on its rear surface, facing away from the permanent magnet device 90, having a soft magnetic material, being fixedly connected to each other, and having an eddy current with the permanent magnet device 90. The surface element (88) is characterized in that the dividing element (60) of the non-magnetic material is spaced apart from each other by the provided spacing (58). 15. The method of claim 14, An eddy current surface element 88 is provided in the dry space portion 68 of the stator casing 26, which is sealed off by the splitting element 60 and separated from the intermediate space 38 filled with the cooling fluid 42. A drive motor, characterized in that. The method according to claim 14 or 15, Eddy current surface element 88 and permanent magnet arrangement 90 are flat, disk-shaped configurations and axially spaced coupling elements axially spaced from one another, and eddy current surface element 88 and permanent magnet arrangement 90 The splitting element (60) provided in the axial planar spacing (58) therebetween is in the form of a plate element (62) secured to the stator casing (26). The method according to claim 14 or 15, The eddy current surface element 88 and the permanent magnet device 90 are annular in configuration and arranged in mutually coaxial relationship and in the form of a center coupling element. The method of claim 17, The drive motor, characterized in that the dividing element 60 provided in the radially annular gap 58 between the eddy current surface element 88 and the permanent magnet device 90 is cup-shaped sealed to the stator casing 26. . The method of claim 17, The splitting element 60 provided in the radially annular gap 58 between the eddy current surface element 88 and the permanent magnet device 90 is shaped like a cylindrical sleeve 74 secured to the stator casing 26. Characterized in that the drive motor. The method according to any one of claims 1, 2, 3, 8, 9, 14 or 15, A drive motor, characterized in that at least one of the stator casing (26) and the outer casing (36) is formed of cooling ribs (78) protruding into a sealed, sealed intermediate space (38) filled with cooling fluid. The method of claim 20, Drive motor, characterized in that a permanent magnet coupling (52) having a coolant impeller (48) is provided on the drive shaft (20) between the rotor (16) and the pump impeller (72). The method of claim 20, Drive motor, characterized in that a permanent magnet coupling (52) having a coolant impeller (48) is provided on a portion of the drive shaft (20) spaced apart from the pump impeller (72).

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