JPH0243423B2 - - Google Patents

Description

[Detailed Description of the Invention] [Technical Field of the Invention] This invention provides a vertical submersible electric motor having at least a lower bracket molded with a resin molding material, which is placed at the bottom of a well or a pond with the lower bracket facing downward. The present invention relates to a vertical submersible electric motor that is used while being immersed in well water or water in a pond, and particularly to a vertical submersible electric motor that prevents damage to the lower bracket molded with resin molding material during installation or operation.

[Prior art]

An example of a conventional vertical submersible motor in which a stator frame and an upper bracket are molded from a resin molding material is disclosed in Japanese Utility Model Application Publication No. 58-43175. FIG. 1 is a partial sectional view showing a conventional vertical submersible electric motor in which a stator frame and a lower bracket are molded with resin molding material. In the figure,
1 is a stator with a stator core 2 and a stator winding 3 wound around the stator core 2; 4 is a stator with a thin non-magnetic stainless steel pipe on the inner peripheral surface of the stator 1; Cans formed by welding (not shown)
A stator frame is molded with a resin mold material made of polyester resin or vinyl resin, and 5 is a plurality of caps molded on the lower end side of the stator frame 4, each having a female thread 5a on the inner peripheral surface. is engraved. Reference numeral 6 denotes a lower bracket molded from a resin mold material that is removably connected to the lower end side of the stator frame 4, and includes a plurality of fastening members 7 made of respective bolts that are screwed and connected to the plurality of caps 5. Detachably connected. 6a is a boss formed on the upper side of the lower bracket 6; 6b is a recess that communicates with this boss 6a through a through hole 6c;
is formed. Reference numeral 6f denotes a through-hole female thread cut into the cylindrical portion 6e, which is an injection hole for clean water containing antifreeze. For example, four mounting feet 6g are integrally formed on the outer peripheral surface of the cylindrical portion 6e, and the lower end surfaces 6h protrude downward from the lower end surface of the cylindrical portion 6e, respectively, and the bottom of the well or the bottom of the pond ( (None shown)
It is designed to be placed on the 8 is the recess 6b
A compression conical coil spring 10 that presses the bellows 9 toward the inner part of the recess 6b with a predetermined elastic force, and a compression conical coil spring 10 that is removably fitted to the inner peripheral surface of the outer end of the recess 6b. An internal pressure regulating device constituted by an end cap 11 is designed to prevent breathing effects caused by temperature changes within the electric motor and to prevent flow between fresh water inside the electric motor and outside water (none of which is shown). being done. 12 is an embolus consisting of a plug that is removably screwed into the injection hole 6f; 13 is a stator core 2;
The rotor core 14 is paired with the rotor core 1.
3, which is rotatably supported by the lower bracket 6 via a cylindrical bearing 15 at one end, and detachably connected to the upper end surface of the stator frame 4 at the other end. It is rotatably supported by a cylindrical upper bracket (not shown) via a cylindrical bearing (not shown), and a pump device (not shown), for example, is connected to an upwardly protruding portion of the upper bracket. There is. Further, a power supply cable connected to a ground power source passes through the upper bracket and is connected to the stator winding 3 (not shown). Reference numeral 16 denotes a thrust bearing device mounted on the lower bracket 6 side of the rotor shaft 14, and is designed to support the thrust load acting on the rotor shaft 14.

Next, the operation of the device configured as described above will be explained. When the power supply switch is turned on, the rotor core 13, rotor shaft 14, and thrust bearing device 1 are activated.
The thrust disk No. 6, the rotating shaft of the pump device, and the impeller rotate together, and the water in the well or pond is sucked into the pump device, rises in the pumping pipe, and is drained to a predetermined location on the ground. . in this case,
A radial load acting on the rotor shaft 14 is supported by a pair of cylindrical bearings 15, and a thrust load acting below the rotor shaft 14 is supported by a thrust bearing device 16. In addition, the fresh water sealed in the electric motor is supplied to the rotor core 13, the rotor shaft 14, and the thrust bearing device 1.
6, etc., and flows inside the electric motor, lubricating the pair of cylindrical bearings 15 and suppressing the rise in temperature of the electric motor. Further, the internal pressure regulating device 8 prevents flow between the sealed fresh water and outside water due to a change in volume due to expansion and contraction of the fresh water sealed in the electric motor due to a temperature change.

The conventional vertical submersible electric motor is constructed and operates as described above, but in particular, the lower end surface 6h of the mounting foot 6g of the lower bracket 6 molded with resin mold material is attached to the bottom of a well or the bottom of a pond. When the vertical submersible electric motor is installed in a well or pond, the lower end surface 6h of the installation foot 6g of the lower bracket 6 is placed directly on the bottom of the well or pond.
The problem was that the lower bracket 6 was damaged due to the impact caused by the collision. Another disadvantage is that the vertical submersible motor vibrates during operation, and a repeated impact force acts on the mounting foot 6g, damaging the lower bracket 6 and requiring the operation of the vertical submersible motor to be stopped.

[Summary of the invention]

The present invention has been made in an attempt to eliminate such drawbacks, and by coupling a buffer leg member made of an elastic body to the lower bracket and protruding downward from the lower end surface of the bracket, the vertical submersible electric motor can be used in a well or in a well. The purpose of the present invention is to propose a vertical submersible electric motor with excellent quality and improved operating efficiency, in which the lower bracket will not be damaged during installation in a pond or during operation.

[Embodiments of the invention]

FIG. 2 is a partial sectional view showing a first embodiment of the invention. In the figure, 6 is a lower bracket with a circular outer circumference, 6h is a lower end surface of this lower bracket 6, 6i is an inner circular recess formed on the lower end surface 6h side, and 6j are equally spaced on the lower end surface 6h side. For example, four circular recesses 6k are formed, and a through hole 7 is formed concentrically with each recess 6j.
is a plurality of fastening members consisting of a plurality of bolts,
The respective heads are loosely fitted into the respective recesses 6j and are inserted through the through holes 6k to be screwed onto the respective bases 5, and the lower bracket 6 is screwed to the lower end side end surface of the stator frame 4. . Reference numeral 7 denotes a buffer leg member formed in an annular shape and made of an elastic material such as synthetic rubber, the outer peripheral surface of which is detachably connected to the inner peripheral surface of the recess 6i, and the inner peripheral surface has a larger diameter than the opening of the recess 6b. It is formed. 17
Reference character a denotes a lower end surface of the buffer leg member 17, which projects downward from the lower end surface 6h of the lower bracket 6. The rest of the configuration is the same as that of a conventional vertical submersible electric motor, so a description thereof will be omitted.

When the vertical submersible motor configured in this way is installed at the bottom of a well or pond, the lower end surface 17a of the buffer leg member 17 comes into contact with the bottom of the well or pond, and the lower end surface 6h of the lower bracket 6 Since it does not come into contact with the bottom of the well or pond, the impact force acting on the lower bracket 6 is significantly reduced, and damage to the lower bracket 6 during installation can be prevented. In addition, the lower bracket 6 may be damaged due to vibration during operation.
Since the impact force acting on the lower bracket 6 is also greatly reduced, damage to the lower bracket 6 during operation is also prevented. The other operations are the same as those of the conventional vertical submersible motor, so the explanation will be omitted. In this embodiment, the lower bracket 6 has been described as having a circular outer circumference.
The present invention is not limited to this embodiment, and for example, as in the lower bracket 6 of a conventional vertical submersible motor, a circular outer peripheral wall is provided on the outer periphery of the recessed portion 6b, a cylindrical portion is formed in the intermediate portion, and a plurality of A predetermined thick portion may be formed integrally and continuously with the outer circumferential surface of the cylindrical portion above the outer circumferential portion of the through hole 6k and the inner circumferential circular recess 6i. Furthermore, in this embodiment, the buffer leg member 17 has been described as having an annular shape and an inner circumferential surface having a larger diameter than the opening of the recess 6b, but the inner circumferential surface is not necessarily circular. The diameter of the recess 6b may not be larger than that of the opening of the recess 6b.

3 and 4 show a second embodiment of the present invention, with FIG. 3 being a partial sectional view and FIG. 4 being a plan view of the lower bracket viewed from the lower end side. In the figure, reference numeral 6e denotes a cylindrical portion having a circular outer circumference formed on the lower bracket 6, the lower end surface of which protrudes below lower end surfaces 6h of the plurality of installation legs 6g. 1
Reference numeral 7 denotes an annular buffer leg member made of an elastic material such as synthetic rubber, and its inner circumferential surface is fitted into a downward protrusion from the lower end surface 6h of the installation leg 6g of the cylindrical portion 6e. The rest of the configuration is the same as that of a conventional vertical submersible electric motor, so a description thereof will be omitted. Further, since the operation is the same as that of the first embodiment, the explanation will be omitted, but the structure is such that the inner circumferential surface of the annular buffer leg member 17 is fitted into the outer circumferential surface of the outer circumferential cylinder portion 6e. This makes it easy to attach the buffer leg member 17 to the lower bracket 6.

5 to 8 show a third embodiment of the present invention, in which FIG. 5 is a partial sectional view, FIG. 6 is a plan view of the lower bracket seen from the lower end, and FIG. 7 is a shock absorbing leg. The plan view of the member, FIG. 8, is a sectional view taken in the - direction of FIG.

In the figure, reference numeral 6e denotes a cylindrical portion having a circular outer circumference formed on the lower bracket 6, the lower end surface of which protrudes below lower end surfaces 6h of the plurality of installation legs 6g. Reference numeral 17 denotes a buffer leg member made of an elastic material such as synthetic rubber, which is connected between a plurality of installation legs 6g and includes a plurality of protrusions 17c that protrude downward from the lower end surface of the lower bracket 6; A hollow space is formed continuously between the plurality of protrusions 17c and integrally with the protrusions 17c, and the lower end surface 17a is disposed on the plurality of protrusions 17c on substantially the same plane as the lower end surface 17a. A shaped protrusion 17d is formed. Other configurations and operations are the same as those of the second embodiment, so explanations will be omitted. However, a plurality of protrusions 17c are provided between the plurality of installation feet 6g along the entire length of the installation foot 6g in the axial direction. Since the structure is such that they are joined across, the joint area between the buffer leg members 17 and the lower bracket 6 becomes large, and the buffer leg members 1
Since the shock absorbing leg members 17 are more difficult to separate from the lower bracket 6, the shock absorbing leg members 17 can be reliably attached to the lower bracket 6.

9 to 11 show a fourth embodiment of the present invention, in which FIG. 9 is a partial sectional view, FIG. 10 is a plan view of the buffer leg member seen from above, and FIG.
FIG. 2 is a cross-sectional view in the WI-WI direction of FIG. In the figure, reference numeral 6e denotes a cylindrical portion having a circular outer circumference formed on the lower bracket 6, the lower end surface of which protrudes below lower end surfaces 6h of the plurality of installation legs 6g. Reference numeral 17 denotes a buffer leg member made of an elastic material such as synthetic rubber, which is connected to each of the plurality of installation legs 6g, and has a fitting recess at its upper end that fits into the head of each of the plurality of fastening members 7. A plurality of protrusions 17c provided with 17e.
The plurality of protrusions 17c are formed continuously and integrally, and the lower end surface 17a protrudes from the lower end surface 6h of the lower bracket 6, and the lower end surface 1
7a is a hollow protrusion 17d disposed on substantially the same plane as the lower end surface 17a of the plurality of protrusions 17c.
is formed. Other configurations and operations are the same as those of the second embodiment, so explanations will be omitted.
g, and the fitting recesses 17e provided at the upper ends of the respective protrusions 17c are fitted into the respective heads of the plurality of fastening members 7. Therefore, the attachment of the buffer leg member 17 to the lower bracket 6 is ensured, and loosening of the fastening member 7 can be prevented.

〔Effect of the invention〕

As explained above, the present invention provides a vertical submersible electric motor in which the lower bracket rotatably supports at least one end side of the rotor shaft coupled to the lower end side of the stator frame and is molded from a resin molding material. A vertical submersible electric motor of excellent quality and improved operating rate, in which the lower bracket is not damaged during installation or operation, is provided by attaching a buffer leg member made of an elastic body that protrudes downward from the lower end surface of the lower bracket to the lower bracket. There are effects that can be provided. Furthermore, if the plurality of protrusions of the shock absorbing leg member are connected over the entire length of the plurality of installation feet of the lower bracket in the axial direction, the shock absorbing leg member becomes difficult to separate from the lower bracket, and the shock absorbing leg member This has the effect of making it possible to securely attach it to the lower bracket.

[Brief explanation of the drawing]

Figure 1 is a partial cross-sectional view of a conventional vertical submersible electric motor.
FIG. 2 is a partial sectional view showing a first embodiment of the present invention, FIGS. 3 and 4 are partial sectional views showing a second embodiment of the invention, FIG. 3 is a partial sectional view, and FIG. 5 is a plan view of the lower bracket viewed from the lower end side, FIGS. 5 to 8 show a third embodiment of the present invention, FIG. 5 is a partial sectional view, and FIG. 6 is a plan view of the lower bracket viewed from the lower end side. 7 is a plan view of the shock absorbing leg member, FIG. 8 is a sectional view taken in the - direction of FIG. 7, and FIGS. 9 to 11 show a fourth embodiment of the present invention. 9 is a partial sectional view, FIG. 10 is a plan view of the buffer leg member, and FIG.
FIG. 3 is a cross-sectional view in the XI direction. In the figure, 4 is a stator frame, 6 is a lower bracket, 6e is a cylindrical portion, 6g is an installation foot, 6h is a lower end surface of the installation foot, 7 is a fastening member, 8 is an internal pressure adjustment device, 1
7 is a buffer leg member, 17a is a lower end surface, 17b is an inner peripheral surface, 17c is a plurality of protrusions, and 17d is a hollow protrusion. Note that the same reference numerals in the figures indicate the same or corresponding parts.

Claims (1)

[Scope of Claims] 1. A vertical submersible electric motor in which a lower bracket, which is connected to at least the lower end of the stator frame and rotatably supports one end of the rotor shaft, is formed of a resin mold material, A vertical submersible electric motor characterized in that a buffer leg member made of an elastic body is fitted and protrudes downward from a lower end surface of the bracket. 2. The cylindrical portion of the lower bracket on which the internal pressure adjustment device is attached is made to protrude downward from the lower end surface of the installation foot of the bracket, and the inner periphery of the ring-shaped buffer leg member is fitted onto the outer periphery of this protruding cylindrical portion. A vertical submersible electric motor according to claim 1, characterized in that: 3. The vertical underwater motor according to claim 2, wherein the buffer leg member is formed in an annular shape. 4. In a vertical submersible electric motor in which a lower bracket, which is connected to at least the lower end of the stator frame and rotatably supports one end of the rotor shaft, is molded from a resin molding material, a plurality of lower brackets formed on the lower bracket are provided. an installation foot, a plurality of protrusions connected between the plurality of installation feet and protruding downward from the lower end surface of the lower bracket; and a plurality of protrusions connected continuously between the plurality of protrusions, A buffer leg member made of an elastic body and having a hollow protrusion integrally formed with the plurality of protrusions and having a lower end surface substantially flush with the lower end surfaces of the plurality of protrusions. A vertical submersible electric motor characterized by: