JPH0575496U - Non-seal pump - Google Patents

Abstract

(57) [Abstract] [Purpose] To realize a non-seal pump that has a simple internal structure, is easy to manufacture, and has few stagnant parts, and also to reduce the size and thickness of the entire pump device. [Structure] An annular support sliding portion 13 formed on the outer edge of the impeller 10 faces the inner surface of the casing 20 and supports the impeller 10 itself in a radial / thrust direction. The magnet 13 a attached to the support sliding portion 13 includes electromagnetic coils 31, 32, 3 arranged on the outer periphery of the casing 20.
Since rotational torque is received by the rotating magnetic field formed by 3, ..., The impeller 10 synchronously rotates in the sliding contact state with the inner surface of the casing 20.

Description

[Detailed description of the device]

[0001]

[Industrial applications]

 The present invention relates to the structure of a non-seal pump, and more particularly to a magnet type pump that synchronously drives an impeller housed in a casing based on an electromagnetic force between a permanent magnet attached to an impeller and an electromagnetic coil block that generates a rotating magnetic field. Regarding the structure.

[0002]

[Prior Art]

 As a conventional non-seal pump, there is a so-called magnet type pump, that is, one in which an impeller in a casing is rotationally driven by an electromagnetic force from outside without contact. This type of pump includes a type that transmits the rotation of the motor to the impeller by magnetic coupling and a type that directly generates a rotating torque by forming a rotating magnetic field by the electromagnetic coil.For example, in the latter case, the rotating impeller rotates inside the casing. There is one (Japanese Patent Laid-Open No. 60-144140) in which a shaft is accommodated in a supported state, a magnet is attached to an axial extension fixed to an impeller, and an electromagnetic coil is provided on the outer periphery of the magnet.

[0003]

[Problems to be solved by the device]

 In the conventional magnet type non-seal pump described above, since the rotating shaft is supported and the magnetic action portion is provided on the extension thereof, the drive portion and the rotating portion are less integrated, and the volume of the pump device increases. In addition, since the rotating shaft other than the impeller and its extended parts are housed inside the casing, the internal structure becomes complicated, the liquid and gas retention areas increase, and parts are assembled and processed, and special gas-liquid components are used. For example, it becomes difficult to form a protective film against corrosive liquids. Therefore, the present invention solves the above-mentioned problems, and an object thereof is to realize a non-seal pump which has a simple structure that can be made small and thin and is easy to manufacture and has a small stagnant portion.

[0004]

[Means for Solving the Problems]

 In order to solve the above-mentioned problem, in the non-seal pump that rotationally drives the impeller by the magnetic field generated by the electromagnetic coil, the means taken by the present invention is to provide the electromagnetic coil block with a magnetic pole surface facing the outer peripheral surface or the inner peripheral surface of the impeller. The impeller is provided with a supporting slide portion at its outer edge portion or inner edge portion that is in face-to-face contact with the casing in the rotational axis direction and the rotational radial direction, and is accommodated in the casing in a loosely fitted state. The opposing portions are permanent magnets. Here, it is preferable that the support sliding portion is formed in an annular shape continuous in the rotation direction, and the impeller is composed of the support sliding portion and a blade portion that is connected only to the support sliding portion and extends in the rotation center direction. Further, the support sliding portion may be formed in an arc shape extending in the rotating direction. In these cases, the casing is provided with a guide groove or a guide frame continuously in the rotational direction, and the supporting sliding portion is provided with a protruding portion or a concave groove to be fitted in the guide groove or both sides of the guide frame in a loosely fitted state. It is desirable to form pole faces facing the top surface or bottom surface and side surfaces of the protrusion or the groove on the block.

[0005]

[Action]

 According to such means, the structure of the impeller and the casing can be formed extremely simply, so that the fluid retention area is reduced and the manufacturing is easy, and since the magnetic pole surfaces are provided on the outer and inner circumferences of the impeller, the size and thickness are reduced. Is possible. In particular, when the rotary shaft is eliminated, the stagnant portion is almost eliminated, and the passage resistance of the fluid at the time of stop can be reduced. If the support sliding portion has an arcuate shape, it can be stably slidably rotated by the attractive force of the magnetic field. If the casing and the support sliding portion are formed in a fitting shape and the magnetic pole surface corresponding to this is formed, the magnetic action can be strengthened and the rotational torque can be increased.

[0006]

【Example】

 An embodiment of the present invention will be described below with reference to the accompanying drawings. The following examples are common in that the impeller is rotated synchronously by forming a rotating magnetic field with six electromagnetic coils to which a three-phase alternating current is applied, but the impeller stably rotates with this structure. Is proven. FIG. 1 is a longitudinal sectional view showing a first embodiment of the present invention taken along a plane perpendicular to a rotary shaft, and FIG. 2 is a vertical sectional view showing a state taken along a plane including the rotary shaft of the first embodiment. is there. The impeller 10 housed in the casing 20 provided with the suction port 20a and the discharge port 20b in a loosely fitted state has a warhead-shaped central shaft 11, six blades 12 extending radially from the central shaft 11, and a blade 12 The support sliding frame 13 is connected to the front end of the casing 20. The supporting sliding frame 13 is formed so as to wrap around from the peripheral surface so as to match the inner surface of the casing 20. A magnet 13a having a magnetic pole is formed at the end in the rotation direction. On the outer side of the support sliding frame 13, there are attached frustoconical electromagnetic coils 31, 31 ', 32, 32', 33, 33 ', and iron cores 41, 41', 42, connected to an annular yoke 50. 42 ′, 43, 43 ′ face the peripheral surface of the supporting sliding frame 13 with the casing 20 interposed therebetween. As shown in FIG. 3, three-phase alternating currents R, S, and T are supplied to these electromagnetic coils via a variable frequency transistor inverter TI, and two pairs of Y-type loads are configured as a whole. A rotating magnetic field is formed in the casing 20 by the three-phase alternating current, and the impeller 10 rotates at a constant speed. In this state, the support sliding frame 13 slides on the inner surface of the casing 20 to support the impeller 10 in the axial direction and the radial direction. Since it is not a support structure by a rotating shaft, the shape of the impeller 10 and the casing 20 is simple, manufacturing and assembling, surface treatment, etc. can be facilitated, and the retained portion can be reduced, and further, it is formed on the outer edge of the impeller 10. Since the magnet 13a is attached to the support sliding frame 13 itself, the driving torque increases.

Next, a second embodiment according to the present invention is shown in FIG. In this embodiment, the impeller 60 consists of a supporting sliding frame 63 and vanes 62, with no central shaft. A projecting portion 63a is formed on the outer surface of the supporting sliding frame 63 over the entire circumference, and the projecting portion 63a is loosely fitted in the guide groove 70a formed in the casing 70. On the other hand, the iron cores 91, ... 93, ... Of the electromagnetic coils 81, ..., 83, ... Are provided with substantially U-shaped tip portions so as to face the top surface and side surfaces of the projecting portion 63a from behind the guide groove 70a. .. In this embodiment, the supporting sliding frame 63 and the casing 70 are fitted to each other to support the impeller 60, and at the same time, the fitting shape allows the iron core and the magnet (including the protruding portion 63a) Since the magnetic interaction with the outer surface) is strengthened, it is possible to obtain support stability and a large rotational torque with a simple structure. In addition, since an unnecessary center shaft is not provided for support, the retention area is further reduced, and the gas-liquid passage resistance when the impeller is stopped is also reduced. Note that, as shown in FIG. 5, the fitting portion between the support sliding frame 64 and the casing 71 may be a combination of the concave groove 64a and the guide frame 71a. In this case, the iron core 95 is provided with a projecting portion at the tip so as to match the shape of the guide frame 71a.

As a mode applicable to both the first embodiment and the second embodiment, a structure exerting a rotating magnetic field from the side surface side of the supporting sliding frame is shown in FIGS. 6 and 7. FIG. 6 shows an example of a supporting sliding frame 65 having a protrusion 65a similar to that of the second embodiment. As shown in FIG. 7, electromagnetic coils 1A, 1A ', 2A, 2A', 3A, 3A 'provided with iron cores 41A, 41A', 42A, 42A ', 43A, 43A' facing the top surface of the protrusion 65a. In addition, the electromagnetic coils 1B, 1B ', 2B, 2B', 3B, 3B 'having the iron cores 41B, 41B', 42B, 42B ', 43B, 43B' facing the side surfaces of the protruding portion 65a are formed. In this case, although the volume of the pump device is increased, it is possible to prevent spatial interference between the two pairs of coil groups as the number of coil turns increases. By applying a three-phase alternating current with a delay of 60 degrees to the electromagnetic coils 1B, 1B ', 2B, 2B', 3B, 3B ', the synchronous torque due to the rotating magnetic field can be increased and the fluctuation of the rotating torque can be suppressed. In this case, another set of electromagnetic coils may be installed to apply a magnetic field from both front and rear side surfaces. In addition, in each of the embodiments described so far, in order to efficiently increase the rotating magnetic field strength with respect to the volume of the pump device, an electromagnetic coil having a truncated cone shape or a truncated pyramid shape whose diameter increases toward the outside of the device. Is used.

In the embodiment shown in FIG. 8, electromagnetic coils 85, 85 ', 86, 86', 87, 87 'having iron cores 95, 95', 96, 96 ', 97, 97' inside are arranged. However, the impeller 66 including the support sliding portion 67 and the blades 68 is housed in the outer casing. Each electromagnetic coil has a truncated cone shape as in the above embodiment. FIG. 9 is an embodiment showing a modified example of the second embodiment, in which an impeller 110 is composed of an arcuate support sliding portion 113 having an end portion in the rotational direction and a blade 112, and a protruding portion 114 is fitted in a guide groove. Rotate in the casing in the combined state. In this case, since an attractive force acts between the magnet 115 and the rotating magnetic field formed by the surrounding electromagnetic coil, the impeller 110 and the inner surface of the casing always slide in close contact with each other, so that vibration is not stably induced. Rotate. In each of the embodiments described above, the support sliding portion and the inner surface of the casing are configured to rotate in a sliding contact state. However, as shown in a partially enlarged sectional view of FIG. 10, the support sliding portion and the casing are rotated. A magnet may be provided on the to support the impeller with magnetic repulsion. In FIG. 10A, the magnets 14a and 14b are attached to the support sliding frame 13 of the first embodiment, and the magnets 15a and 15b are attached to the casing 20 to support the impeller 10 in the rotational axis direction and the radial direction. To do. FIG. 10B shows that the impeller 60 is similarly supported by mounting the magnet 163 on the supporting sliding frame 63 and the magnets 76a and 76b on the casing 70 in the second embodiment. ..

[0010]

[Effect of the device]

 As described above, the present invention is characterized in that the electromagnetic coil is arranged on the outer circumference or the inner circumference of the casing, and the supporting sliding portion is integrated with the outer edge or the inner edge of the impeller to provide the magnet. Produce an effect. The simple structure of the impeller and casing reduces the fluid retention area and simplifies manufacturing and assembly, and the placement of the electromagnetic coil makes it possible to realize a compact and thin non-sealing pump. When the rotary shaft is eliminated, the stagnant portion is almost eliminated and the passage resistance of the fluid at the time of stop is also reduced. In particular, if the support sliding portion has an arcuate shape, it can be stably slid and rotated by the attraction force of the magnetic field. If the casing and the support sliding portion are formed into a fitting shape and a magnetic pole surface corresponding to this is formed, the magnetic action can be strengthened and the rotational torque can be increased.

[Brief description of drawings]

FIG. 1 is a longitudinal sectional view showing a first embodiment of the present invention as viewed from the discharge side.

FIG. 2 is a vertical cross-sectional view showing a state of the first embodiment cut along a plane including a rotation axis.

FIG. 3 is a wiring diagram showing a power supply state to the electromagnetic coil of the first embodiment.

FIG. 4 is a vertical sectional view showing an impeller of a second embodiment according to the present invention as seen from the suction side, and a vertical sectional view showing a state cut along a plane including a rotation shaft of the second embodiment. It is a figure (b).

FIG. 5 is an enlarged cross-sectional view showing a modified example of the support sliding portion of the second embodiment.

FIG. 6 is an enlarged cross-sectional view showing an example of a mode applicable to the first and second embodiments.

FIG. 7 is a conceptual diagram for explaining an example of the same aspect.

FIG. 8 is a vertical sectional view showing the structure of a different embodiment.

FIG. 9 is a vertical cross-sectional view showing the structure of another different embodiment.

FIG. 10 is a partially enlarged sectional view showing a modified example (a) of the first embodiment and a modified example (b) of the second embodiment in which the impeller is supported by a magnetic repulsive force.

[Explanation of symbols]

 10, 60, 66, 110 Impeller 13, 63, 64, 65, 67, 113 Support sliding frame 13a Magnet 31, 32, 33, 81, 82, 83 Electromagnetic coil 41, 42, 43, 91, 92, 93 Iron core 50,51 Yoke 63a, 65a, 114 Projection part 64a Recessed groove 70,71,72 Casing 70a, 72a Guide groove 71a Guide frame

Front page continuation (72) Inventor Yoshinori Shinbo 698-2 Shimokobunezuhama, Ogata-machi, Nakakubiki-gun, Niigata

Claims (4)

[Scope of utility model registration request] 1. A non-seal pump that has an impeller housed in a casing and has a permanent magnet mounted thereon, and an electromagnetic coil block that applies a magnetic field to the permanent magnet from the outside of the casing, wherein the impeller is driven to rotate by a magnetic field. The electromagnetic coil block includes a magnetic pole surface facing the outer peripheral surface or the inner peripheral surface of the impeller, and the impeller has a supporting sliding portion that is in contact with the casing in the rotation axis direction and the rotational radius direction at the outer edge portion or the inner edge portion thereof. A non-seal pump, characterized in that it is housed in the casing in a loosely fitted state, and that a portion of the support sliding portion facing the magnetic pole surface is a permanent magnet. 2. The support sliding portion according to claim 1, wherein the support sliding portion is formed in an annular shape continuous in the rotational direction, and the impeller is
A non-seal pump, comprising: the supporting sliding portion; and a blade portion that is connected only to the supporting sliding portion and extends in the rotation center direction. 3. The support sliding portion according to claim 1, wherein the supporting sliding portion is formed in an arc shape extending in a rotational direction, and the impeller is connected only to the supporting sliding portion and the supporting sliding portion in a rotation center direction. A non-seal pump, which comprises a vane portion that extends. 4. The casing according to claim 1, wherein the casing has a guide groove or a guide frame formed continuously in the rotation direction, and the support sliding portion is provided in the guide groove. Alternatively, it has projections or concave grooves that are fitted in a loose fit state on both sides of the guide frame, and the electromagnetic coil block has magnetic pole surfaces facing the top surface or bottom surface and side surfaces of the projections or concave grooves. A non-seal pump.