JPH0147106B2 - - Google Patents

Description

Detailed Description of the Invention [Industrial Field of Application] The present invention is directed to a frame body formed of a molding material such as resin, which is used as a drive source for, for example, a canned type electric circulation pump device, and which molds a stator. This invention relates to an improvement of a land-use liquid-sealed cand motor.

[Prior art] As a conventional motor of this type, the
As disclosed in Japanese Patent No. 116858, there is one in which a stator is provided with a frame made of a molded material.
By the way, when a motor having such a configuration is constructed as a liquid-sealed motor, it is also conceivable to arrange a well-known can inside the frame. That is, a liquid-sealed can motor for land use may be considered, in which a can is arranged on the inner periphery of a frame made of molded material. FIG. 2 shows a conventional example having such a configuration. In the same figure, 1 is a stator;
The stator 1 includes a stator core 2 and a stator winding 3 wound around the stator core 2. 4 is a thin cylindrical can attached to the inner peripheral surface of the stator core 2; 20 is a hollow frame made of a molding material such as resin for molding the stator 1; On the inside, a first circumferential groove 20b is formed at a predetermined depth in the axial direction, and a circumferential groove 20b is formed continuously on the inner circumferential wall of the first circumferential groove 20b at a predetermined depth in the radial direction over the entire circumference. second circumferential groove 2
0c is formed. 21 is the first circumferential groove 2
This is a water sealing member such as an O-ring installed in the second circumferential groove 20c inside the can 4, and reliably seals between the inner circumference of the can 4 and the second circumferential groove 20c. The inner end of the can 4 is inserted to the innermost part of the first circumferential groove 20b.

[Problems to be Solved by the Invention] However, in such a conventional land-use liquid-sealed can motor, when sealing the inner end side of the can 4, a groove formed of an annular groove is formed in the deep part of the frame 20. 1. It is necessary to provide the second circumferential grooves 20b and 20c and attach a water sealing member 21 such as an O-ring, which makes the structure complicated, and not only is it difficult to form the circumferential groove itself, but also the circumferential groove There was a problem that the work of attaching the water seal member 21 to the water seal member 21 was troublesome.

Therefore, the present invention has been made in view of the above-mentioned conventional problems, and its purpose is to reliably seal the can without installing a water sealing member such as an O-ring. In addition, even if the filled liquid gets around the outer periphery of the can, it can be discharged to the outside of the frame, protecting the stator from the filled liquid, reducing processing costs and the number of parts, and improving assembly workability. The object of the present invention is to obtain a liquid-sealed cand motor for land use.

[Means for Solving the Problems] In order to achieve the above object, the present invention includes a stator, a cylindrical frame body in which the stator is molded,
A load-side bracket and an exhaust plug that seal openings at both ends of the frame, a rotor shaft rotatably disposed within the frame via a bearing, and a rotor shaft corresponding to the stator. A rotor core provided in the
The can includes a can joined to the inner circumferential surface of the frame body, and an enclosed liquid sealed in the frame body, and an opening at one end of the frame body extends radially inward from the inner circumference of the frame body. An inwardly facing shoulder is formed, and a through hole is formed in the center of the shoulder in the axial direction of the frame body, and the exhaust plug seals this through hole, and one end of the can is connected to the can. It is integrally molded within the shoulder of the frame, and the shoulder is provided with a plurality of drainage holes that communicate the outside of the frame and the mold-side end of the can.

[Function] In the present invention, one end of the can is integrally molded within the shoulder of the frame, thereby preventing the sealed liquid from flowing around to the outer periphery of the can. The sealed liquid that has entered the outer periphery of the can is discharged to the outside of the frame through the drain hole.

[Example] Hereinafter, the present invention will be described in detail based on an example shown in the drawings.

FIG. 1 is a sectional view showing an embodiment of a canned motor according to the present invention. A stator 1 includes a stator core 2 and a stator winding 3 wound around the stator core 2. 4 is a thin cylindrical can attached to the inner circumferential surface of the stator core 2; 5 is a hollow frame with both ends open made of a molding material such as resin; and 5 is a frame body in which the stator 1 is molded. , the can 4 is joined to its inner peripheral surface. An inward shoulder 5a extending radially inward from the inner periphery of the frame 5 is formed at one end opening (counter-load side opening) of the frame 5. A through hole 5b is formed in the center in the axial direction of the frame 5. The outer open end side of the through hole 5b is a female screw portion 5c, and the inner open end side is a straight hole, and a cylindrical bearing rotatably supports one end of the rotor shaft 13 in the straight hole portion 5d. 6 (bearing) is fitted. On the other hand, the female screw portion 5c
An exhaust plug 8 is screwed into the through hole 5b via a first water sealing member 7, thereby watertightly sealing the through hole 5b. The anti-load side end of the can 4 is integrally molded on the outer peripheral portion of the inner surface of the shoulder portion 5a of the frame 5, that is, the portion that contacts the inner peripheral surface of the frame 5.

The exhaust plug 8 has a female screw portion 5c of the shoulder portion 5a.
It has a male screw part 8a that is screwed into the shoulder part 5a, and an outward flange part 8b that comes into contact with the outer end surface of the shoulder part 5a,
The first water seal member 7 is interposed between the inner surface of the flange portion 8b and the outer open end of the through hole 5b. An annular groove 5e is formed at the outer opening end of the through hole 5b, and the first water seal member 7 is fitted into this annular groove 5e and is pressed by the exhaust plug 8.

A plurality of drain holes 5f are formed in the outer periphery of the outer surface of the shoulder portion 5a to communicate the outside of the frame 5 with the mold side end 4a of the can 4.
That is, the drain hole 5f is formed on the same circumference as the diameter of the can 4, and the mold side end 4a of the can 4 is exposed at the inner part thereof.

9 is an opening at the other end of the frame 5 (load side opening)
The load side bracket 9 is formed into a disk shape, and has a cylindrical boss portion 9a integrally projecting at the center of the inner surface, that is, the surface facing the exhaust plug 8. It is set up. Boss part 9a
A through hole 9b is formed in the center of the load side bracket 9 to communicate the inside and outside of the load side bracket 9. A cylindrical bearing (bearing) 11 that rotatably supports the load side end of the rotor shaft 13 is fitted into the through hole 9b. On the other hand, a second water seal member 10 is provided on the outer peripheral surface of the boss portion 9a.
is inserted into the can 4 and is pressed into contact with the load-side inner circumferential surface of the can 4. Further, a through hole 9f is formed in the boss portion 9a in the axial direction to communicate the inside and outside of the load side bracket 9. The load side bracket 9 is attached by fitting the outer circumferential portion 9g into the fitting portion 5g formed near the outer circumference of the other end side open end surface (load side end inner surface) of the frame body 5. The boss portion 9a is fitted to the inner periphery of the can 4 via the second water seal member 10, thereby watertightly sealing the other end opening of the frame 5, that is, the load side opening end. It has stopped. The outer peripheral base 9h of the boss portion 9a has a large diameter and is fitted into a fitting portion 5h formed at the other end opening of the frame 5. Note that 9i and 9j are circumferential surfaces of different diameters formed on the outer circumferential surface of the boss portion 9a.

A stator core 12 is paired with the stator core 2, and is fitted and fixed to the rotor shaft 13. The rotor shaft 13 passes through the cylindrical bearing 11 and projects to the outside of the frame 5.

Reference numeral 14 designates a pump casing of a circulation pump. This pump casing 14 is formed into a cylindrical shape, and has a fitting portion 14a consisting of an opening in a portion facing the load side bracket 9.
4a is fitted into a fitting portion 9k provided on the outer circumferential surface of the load side bracket 9 via a third water seal member 15, and is coupled to the frame body 5 via the load side bracket 9. Openings at both ends of the pump casing 14 constitute a suction port 14b and a discharge port 14c. The suction port 14b and the discharge port 14c are provided so as to be located substantially on the same axis and perpendicular to the axis of the rotor shaft 13. 14d, 14
14f is an opening that communicates the suction passage 14d with the discharge passage 14e, and 14g is the outer end surface of the load side bracket 9 and the pump casing 1.
The load side end of the rotor shaft 13 is inserted into the impeller chamber 14g through the cylindrical bearing 11. Rotor shaft 1
An impeller 17 is fitted to the load side end of No. 3 via an insert fitting 18.
includes a suction-side cylindrical portion 17b extending in the same direction as the axial direction of the rotor shaft 13, and a discharge-side cylindrical portion 17c orthogonal to the axis of the rotor shaft 13 and communicating with the suction-side cylindrical portion 17b; The outer periphery of the cylindrical portion 17b is fitted into the opening 14f via a thin cylindrical base 16. The outer periphery of the suction side cylindrical portion 17b and the mouthpiece 16
An appropriate gap is set between them to enable smooth rotation of the impeller 17. The pump casing 14 and the inside of the frame 5 are communicated with each other through a through hole 9f provided in the load side bracket 9.

Reference numeral 21 denotes a sealed liquid made of fresh water sealed inside the can 4 inside the frame 5, and in this embodiment, it is circulated by a circulation pump to form a circulating liquid.

23 is a buffer member made of rubber or the like, and 24 is a thrust bearing.

Next, the operation of the land-use liquid-sealed cand motor having such a configuration will be explained.

When the operation switch of the canned motor is turned on, the rotor core 13, the rotor shaft 13, the buffer member 23, and the thrust bearing 24 rotate together, and the impeller 17 also rotates together with the rotor shaft 13. Then, the water in the water tank (not shown) flows into the pump casing 14.
Suction port 14b → opening 14f → impeller chamber 14g
→ Discharge port 14c → Returns to the original water tank via piping (not shown) and circulates. Further, a part of this circulating water flows through the through hole 9f of the load side bracket 9 into the can 4, lubricates the pair of cylindrical bearings 6 and 11, and returns to the through hole 9f and the pump casing 14.
By repeating this operation, the pair of cylindrical bearings 6 and 11 are continuously lubricated.

Here, in the present invention, the anti-load side end of the can 4 is integrally molded with the shoulder 5a provided at the opening at one end of the frame 5, so that the filled liquid 21 does not get around to the outer peripheral surface of the can 4. This makes it possible to reliably prevent water sealing members such as O-rings that are conventionally required to seal the can 4. Further, even if the filled liquid 21 enters the joint surface between the opposite end of the can 4 and the shoulder 5a, when the entered filled liquid reaches the opposite end of the can 4, the liquid drain hole 5f Because it is discharged to the outside of the frame 5 through
Encapsulating liquid 21 can be reliably prevented from entering the inside of stator 1.

Although this embodiment has been described as a canned type electric circulation pump device, the present invention is not limited to this embodiment, and the canned motor is used as a single unit, and the through hole 9f is not provided in the load side bracket 9, and the can 4 is simply installed. Of course, the inner peripheral portion may be filled with the liquid 21.

[Effects of the Invention] As explained above, the liquid-sealed can motor for land use according to the present invention has a shoulder at one end opening of the frame in which the stator is molded, and one end of the can is attached to this shoulder. Since the frame is integrally molded during molding, and a drainage hole is formed on the outer surface of the shoulder to communicate the outside of the frame with one end of the can, the can can be easily sealed and can be sealed using an O-ring or the like. The can can be reliably sealed without the need for a water sealing member.
It is possible to reduce the number of parts and assembly man-hours, and further reduce costs. Further, since the sealed liquid that flows around from one end of the can to the outer peripheral surface of the can is discharged to the outside of the frame through the liquid drain hole, the sealed liquid does not enter the stator.

[Brief explanation of drawings]

FIG. 1 is a cross-sectional view showing an embodiment of a land-use liquid-sealed canned motor according to the present invention, and FIG. 2 is a cross-sectional view of the main parts of a conventional canned motor. DESCRIPTION OF SYMBOLS 1... Stator, 2... Stator core, 3... Stator winding, 4... Can, 5... Frame, 5a... Shoulder, 5b... Through hole, 5f... Drain hole , 6...Cylinder bearing, 8...Exhaust plug, 9...Load side bracket,
11... Cylindrical bearing, 12... Rotor core, 13...
...Rotor shaft, 14...Pump casing, 21...
...Filled liquid.

Claims (1)

[Claims] 1. A stator 1, a cylindrical frame 5 in which the stator 1 is molded, a load-side bracket 9 and an exhaust plug 8 that seal the openings at both ends of the frame 5, and a A rotor shaft 13 rotatably disposed via bearings 6 and 11, and a rotor core 12 provided on the rotor shaft 13 in correspondence with the stator 1.
and a can 4 joined to the inner circumferential surface of the frame 5.
and an enclosed liquid 21 sealed in the frame body 5, and an inward shoulder portion 5a extending radially inward from the inner circumference of the frame body 5 is provided at one end opening of the frame body 5. A through hole 5b is formed in the center of this shoulder portion 5a.
is formed in the axial direction of the frame 5, and the exhaust plug 12 seals this through hole 5b.One end of the can 4 is integrally molded within the shoulder 5a of the frame 5, and the A liquid-sealed can motor for land use, characterized in that a shoulder portion 5a is provided with a plurality of drain holes 5f that communicate the outside of the frame 5 and the mold side end of the can 4.