JPH08298750A - Motor provided with water-cooled jacket - Google Patents

Abstract

PURPOSE: To provide a motor provided with a water-cooled jacket in which cooling water is not leaked to the outside, which does not cause the problem of the corrosion of a motor frame, which comes easily into contact with the outer circumferential face of the motor frame and which is detachable as required. CONSTITUTION: A water-cooled jacket 20 has a structure which is attached to the outer circumference of a motor frame which is formed of a steel plate to be a cylindrical shape. The water-cooled jacket 20 is provided with an outer cylinder 4 which is formed of a corrosion-resistant steel plate to be a cylindrical shape and with an inside cylinder 3 which is formed of a corrosion-resistant steel plate to be a cylindrical shape. Four throttle grooves 3a which are extended toward the axial direction and which protrude toward the outside in the radial direction are formed at the inside cylinder 3. The inside cylinder 3 is inserted into the outer cylinder 4, both end parts in the axial direction of both are welded and integrated, and cooling water passages which are composed of four spaces partitioned by the throttle grooves 3a in the gap between the outer cylinder 4 and the inside cylinder 3 are formed. Cooling water passages from a socket 5, on one side which is attached to the outer cylinder 4, and it is discharged from a socket 5 on the other side.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a motor having a water cooling jacket for cooling, and more particularly to a motor having a water cooling jacket suitable for surely cooling a canned motor.

[0002]

7 and 8 are schematic side sectional views showing the structure of a conventional canned motor having a water cooling jacket.

In the canned motors shown in both figures, a stator 2 is fixed to the inner surface of a motor frame 1 formed of a steel plate in a cylindrical shape, and a rotor 7 is rotatably penetrated through the central portion of the stator 2. Is configured.

The rotor 7 is press-fitted and fixed to a shaft 8, and the shaft 8 is supported by upper and lower bearings 9, 9. The shaft 8 is integrated with a pump shaft that drives the pump mechanism A. Further, a thin cylindrical can 6 is inserted into the inner surface of the stator 2 so as to be in close contact with the stator 2 and both upper and lower ends thereof are welded to the motor frame side plates 10.10.

In the canned motor shown in FIG. 7, a body 13 of a cylindrical water cooling jacket is inserted into the outer periphery of the motor frame 1, and ring-shaped flange portions attached to both ends of the body 13 in the axial direction. 21,21,
The O-rings 15 and 15 are deformed by fixing the ring-shaped side plates 14 and 14 with bolts 22, respectively,
The motor frame 1 and the body 13 are connected by the rings 15 and 15.
A cooling water passage W having airtightness is formed between and, and at the same time, the body 13 is held substantially at the center of the motor frame 1.

On the other hand, in the canned motor shown in FIG. 8, the body 1 of the water cooling jacket is provided on the outer periphery of the motor frame 1.
3 is inserted, and the flange portions 23, 23 fixed to both axial end portions of the body 13 are welded at the motor frame 1 and the welding portion 16, so that the motor frame 1 and the body 13 are hermetically sealed. The cooling water passage W having the property is formed.

In both of the canned motors shown in the figures, the body 13 is provided with sockets 5 communicating with the cooling water passage W at upper and lower positions one by one, and when the cooling water is supplied from the lower socket 5. After cooling the motor frame 1 through the cooling water passage W of the water cooling jacket, the cooling water flows out from the upper socket 5.

[0008]

However, the above-mentioned FIG.
In the conventional water-cooling jacket shown in FIG. 1, an O-ring 15 for sealing the water-cooling jacket is attached to the outer periphery of the motor frame 1, but the motor frame 1 is manufactured by bending a steel plate into a cylindrical shape and welding both end sides thereof. As a result, unevenness is generated in the welded portion, and therefore O
There was a problem that the sealing failure of the ring 15 occurred and the cooling water leaked to the outside of the water cooling jacket.

Further, since the motor frame 1 is formed in a cylindrical shape, but is not a perfect circle, there is a problem that the O-ring 15 has a poor sealing even at its deformed portion and the cooling water leaks from the water cooling jacket to the outside.

There is no problem if the cooling water is surely flowing in the water cooling jacket during the operation of the motor, but if the amount of the cooling water is reduced or the cooling water is interrupted even momentarily, O There was a problem that the ring 15 was burned.

Furthermore, since the temperature of the surface of the motor frame 1 does not immediately drop even when the motor is stopped, cooling water is kept until the temperature of the surface of the motor frame 1 falls below the allowable heat resistance temperature of the O-ring 15. Must be run for some time.

When a steel plate having no corrosion resistance is used as the material of the motor frame 1, rust is generated on the surface of the motor frame 1 in the water cooling jacket by passing the cooling water, and the corrosion progresses to the inside of the motor. There is also a problem that the portion of the stator 2 of 1 is flooded.

On the other hand, even in the water cooling jacket having the conventional structure shown in FIG. 8, when a steel plate having no corrosion resistance is used as the material of the motor frame 1, the surface of the motor frame 1 in the water cooling jacket is rusted by passing the cooling water. When the corrosion occurs, the corrosion progresses, causing a problem that the portion of the stator 2 in the motor is flooded.

Further, since the body 13 of the water cooling jacket is welded to the motor frame 1, it cannot be attached or detached, which causes a problem that maintenance such as replacement of the water cooling jacket cannot be performed.

In order to solve the above-mentioned problems of the conventional example, in the conventional water cooling jacket, the inner cylinder having a small diameter and the outer cylinder having a large diameter are axially arranged so that the cooling water does not come into contact with the surface of the motor frame. Both end portions of are welded to form a cooling water passage therein, the inner peripheral surface of the inner cylinder is fitted to the outer peripheral surface of the motor frame, and the cooling water is passed through the cooling water passage, whereby the motor There was also a structure for cooling.

However, in the case of this water cooling jacket,
If there is a slight difference in shape or dimensional error between the outer peripheral surface of the motor frame and the inner peripheral surface of the inner cylinder, they may not come into close contact with each other, which may cause cooling failure.

In particular, when the motor frame has a structure in which a steel plate is curved and welded, the welded portion has irregularities as described above, and therefore the outer peripheral surface of the motor frame and the inner peripheral surface of the inner cylinder are in close contact with each other. It was difficult to do.

The present invention has been made in view of the above points, and there is no fear that cooling water will leak from the inside of the water cooling jacket to the outside, and no inconvenience will occur even if the motor frame becomes a little hot. (EN) Provided is a motor having a water cooling jacket that does not cause a problem of corrosion of the motor frame, does not have a risk of water ingress into the motor, and easily adheres to the outer peripheral surface of the motor frame, and can be detached as required. With the goal.

[0019]

In order to solve the above-mentioned problems, the present invention is directed to a motor frame 1 formed by bending a steel plate into a cylindrical shape and welding both end sides thereof as shown in FIGS. 1 and 2. A stator 2 is fixed to the inner surface, a rotor 7 is rotatably arranged so as to penetrate through the stator 2, and a water cooling jacket having a structure in which a water cooling jacket 20 is attached to the outer periphery of the motor frame 1 is provided. In the motor, the water cooling jacket 20 includes an outer cylinder 4 formed by forming a food-resistant steel plate in a cylindrical shape and an inner cylinder 3 formed by forming a food-resistant steel plate in a cylindrical shape. 1 to a plurality of throttle grooves 3a extending toward the outside and projecting outward in the radial direction are formed, and the outer diameter of the portion of the inner cylinder 3 where the throttle grooves 3a are formed is equal to the inner diameter of the outer cylinder 4. Or smaller,
Further, the inner diameter of the outer cylinder 4 and the outer diameter of the inner cylinder 3 are formed so as to have the same dimension at both ends in the axial direction. Is welded and integrated to form a cooling water passage W composed of a plurality of spaces partitioned by the throttle groove 3a in the gap between the outer cylinder 4 and the inner cylinder 3.

[0020]

With the above-described structure, the heat conducted from the inside of the motor to the motor frame 1 can be prevented.
It can be discharged to the outside from the inner cylinder 3 of the water-cooling jacket 20 that is in close contact with the. At that time, since the concavities and convexities formed in the welding portion of the motor frame 1 can be accommodated in the throttle groove 3a provided in the inner cylinder 3, the inner peripheral surface of the inner cylinder 3 is the outer peripheral surface of the motor frame 1. Can be adhered to.
Further, the inner peripheral surface of the inner cylinder 3 divided into a plurality of parts by the throttle groove 3a is pressed into the outer periphery of the motor frame 1 to be slightly expanded in the radial direction. Therefore, even if the motor frame 1 is not a perfect circle, it can be closely attached to its outer peripheral surface.
Due to these actions, the inner peripheral surface of the inner cylinder 3 surely adheres to the outer peripheral surface of the motor frame 1, and the cooling effect of the water cooling jacket 20 is enhanced. Moreover, since the cooling water passes through the cooling water passage W between the inner cylinder 3 and the outer cylinder 4 which are formed of the corrosion-resistant steel plate, the leakage of the cooling water from the seal portion such as the O-ring and the corrosion of the motor frame 1 are prevented. It also has a function.

[0021]

Embodiments of the present invention will now be described in detail with reference to the drawings. FIG. 1 is a schematic sectional view showing the structure of a canned motor having a water cooling jacket according to an embodiment of the present invention, and FIG. 2 is a perspective view showing the appearance of a water cooling jacket 20. In FIGS. 1 and 2, the parts given the same reference numerals as those in FIGS. 7 and 8 indicate the same or corresponding parts.

As shown in FIG. 1, a canned motor having this water cooling jacket has a stator 2 fixed to the inner surface of a motor frame 1 formed by bending a steel plate into a cylindrical shape and welding both ends thereof to each other. A shaft 8 is press-fitted and fixed in a central portion of the stator 2 through a rotor 7, and both ends of the shaft 8 are bearings 9,
It is configured to be rotatably supported by 9. These points are the same as in the conventional example shown in FIGS.

Further, the shaft 8 is integral with the pump shaft of the pump A, and the thin cylindrical can 6 is inserted into the inner surface of the stator 2 to be in close contact with the stator 2. The upper and lower ends of the can 6 are respectively on the motor frame side plates 1
The fact that it is welded to Nos. 0 and 10 is also the same as that of the conventional example shown in FIGS.

In the present invention, what is different from the conventional example is the structure of the water cooling jacket 20.

That is, the water cooling jacket 20 according to the present invention.
Is composed of an outer cylinder 4 and an inner cylinder 3, and the inner cylinder 3 is inserted into the outer cylinder 4 and both axial end portions of the both are welded together to be integrated with each other. A cooling water passage W, through which cooling water flows, is formed in the gap between them.

The outer cylinder 4 and the inner cylinder 3 are both made of stainless steel plate and have corrosion resistance. Further, as shown in FIG. 2, the inner cylinder 3 is formed with four throttle grooves 3a at equal intervals which extend in the axial direction and project outward in the radial direction.

Sockets 5 and 5 communicating with the cooling water passage W are attached to the upper and lower portions of the outer cylinder 4, respectively.

3 (a) to 3 (c) are perspective views showing the manufacturing process of the inner cylinder 3, and FIG. 3 (d) is shown in FIG. 3 (c).
FIG. 7 is a cross-sectional view taken along line BB of FIG. FIG. 4 is a diagram showing a manufacturing process of the outer cylinder 4.

To manufacture the inner cylinder 3, first, referring to FIG.
As shown in FIG. 5, a stainless steel plate having a predetermined thickness (for example, 0.5 mm) is curved into a tubular shape, and the contact portions 3b on both end sides thereof are welded to form a cylinder.

Next, as shown in FIG. 3B, the diameters of both axial end portions 3c, 3c of the inner cylinder 3 are enlarged by a press.

Outer diameter d of the expanded both ends 3c, 3c
1 is equal to the inner diameter d4 (see FIG. 4) of the outer cylinder 4 described later (d1 = d4).

Next, as shown in FIG. 3C, four throttle grooves 3a extending in the axial direction of the inner cylinder 3 and projecting outward in the radial direction are formed by pressing.

Here, the outer diameter d of the portion where the throttle groove 3a is formed
2 (see FIG. 3D) is equal to or slightly smaller than the outer diameter d1.

If necessary, a convex portion 3e protruding inward is provided at a predetermined position in each throttle groove 3a.
In this embodiment, one protrusion 3 is provided in each throttle groove 3a.
and a convex portion 3e provided in the adjacent throttle groove 3a.
The positions of and are alternately set to the upper and lower positions.

The outer diameter d3 of the convex portion 3e (see FIG. 3)
(See (d)) is smaller than the inner diameter d4 of the outer cylinder 4.

Next, as shown in FIG. 4, the outer cylinder 4 is formed by bending a stainless steel plate having a predetermined thickness (for example, 1.0 mm) into a cylindrical shape and welding the contact portions 4a on both end sides thereof. Is manufactured by Although not shown in FIG. 4, holes for mounting the sockets 5 and 5 shown in FIG. 1 are respectively provided at two positions above and below the outer cylinder 4.

Then, as shown in the cross section in FIGS. 5 (a) and 5 (b), the inner cylinder 3 is press-fitted inside the outer cylinder 4 and both ends thereof are welded to form the welded portions 11 and 12. If integrated, the water cooling jacket 20 is completed.

As a result, between the inner wall of the outer cylinder 4 and the outer wall of the inner cylinder 3 are formed a plurality of cooling water passages W which are partitioned by the throttle grooves 3a and through which cooling water flows. And on the outer cylinder 4,
Sockets 5 and 5 communicating with the cooling water passage W are attached.

As shown in FIG. 6, the water-cooling jacket 20 manufactured in this manner has the inner cylinder 3 press-fitted into the outer periphery of the motor frame 1 by the press 100, and the inner surface of the inner cylinder 3 is attached to the outer periphery of the motor frame 1. And attach them closely.

Since the inner cylinder 3 is provided with the throttle groove 3a at this time, by accommodating the welded portion of the motor frame 1 in the throttle groove 3a, it is possible to avoid irregularities formed in the welded portion. .

Since the inner groove 3 has a predetermined elasticity in the radial direction due to the throttle groove 3a, the inner peripheral surface of the inner cylinder 3 divided into a plurality of portions by the throttle groove 3a has the motor frame 1
When the motor frame 1 is not a perfect circle, the two are surely brought into close contact with each other according to the shape of the outer peripheral surface of the motor frame 1 even if the motor frame 1 is not a perfect circle.

Thus, the canned motor having the water cooling jacket shown in FIG. 1 is completed.

When cooling pipes (not shown) are connected to the sockets 5 and 5 of the water cooling jacket 20 attached to the motor frame 1 in this way, and cooling water is supplied from the lower socket 5 to the cooling water passage W, cooling is performed. The water flows through the cooling water passage W and is discharged from the upper socket 5.

When the motor is driven, the heat generated by the motor is transferred to the motor frame 1 made of steel plate.
Since the inner cylinder 3 of the water cooling jacket 20 is in close contact with the outer periphery of the motor frame 1, the heat is radiated by the cooling water flowing through the cooling water passage W.

In particular, as described above, since the inner peripheral surface of the inner cylinder 3 is in close contact with the outer peripheral surface of the motor frame 1, the cooling effect of the water cooling jacket 20 is high.

At this time, the cooling water passage W is divided into four chambers by the four throttle grooves 3a, and the respective chambers are communicated with each other by the gap portion 25 between the convex portion 3e and the outer cylinder 4. Therefore, the cooling water introduced from the lower socket 5 into one chamber passes through the gap 25 so as to fill adjacent chambers one after another, and then is discharged from the upper socket 5. That is, the cooling water does not flow from one socket 5 to the other socket 5 over a long distance but over a long distance, so that efficient cooling can be performed.

As described above, the water cooling jacket 20 is
Since the cooling water passage W is formed by welding the inner cylinder 3 and the outer cylinder 4 and a seal member such as an O-ring is not used, the cooling water inside does not leak.

Further, since the cooling water does not directly contact the motor frame 1, there is no problem that the motor frame 1 corrodes and the cooling water enters the motor.

In this embodiment, heat dissipation is improved and the inner cylinder 3
So that it fits in closely with the shape of the motor frame 1
The thickness of the inner cylinder 3 (0.5 mm) should be equal to the thickness of the outer cylinder 4 (1.0 mm).
mm) thinner. It is suitable for heat dissipation and adhesion that the wall thickness of the inner cylinder 3 is made as thin as possible without impairing the strength.

The number of throttle grooves 3a may be other than four,
The water cooling jacket 20 may be applied to a motor other than the canned motor.

[0051]

As described in detail above, according to the present invention, the following excellent effects can be obtained. The throttle groove formed in the inner cylinder not only avoids irregularities that occur in the welded portion of the motor frame, but the inner peripheral surface of the inner cylinder divided into a plurality of parts by the throttle groove is press-fitted into the outer periphery of the motor frame. As a result, it spreads slightly in the radial direction, so even if the motor frame is not a perfect circle, it will surely come into close contact with its outer peripheral surface. Therefore, the cooling effect of the water cooling jacket can be enhanced.

Since the water-cooling jacket has a structure in which the outer cylinder and the inner cylinder are integrated and the inner cylinder of the water-cooling jacket is press-fitted onto the outer periphery of the motor frame made of a steel plate, no sealing part for the water-cooling jacket is required, resulting in poor sealing. There is no leakage of cooling water due to, and there is no need for maintenance work on the seal parts, and the cost can be reduced.

Since the cooling water does not come into contact with the motor frame, even if the material of the motor frame does not have corrosion resistance, there is no danger of water intrusion into the motor due to the generation of rust and the progress of corrosion, The durability of can be improved.

Even if the water cooling jacket is to be replaced, it can be replaced by simply pulling out the water cooling jacket from the motor frame and press-fitting another water cooling jacket, so that the maintainability is good.

[Brief description of drawings]

FIG. 1 is a cross-sectional view showing a structure of a canned motor including a water cooling jacket according to an embodiment of the present invention.

FIG. 2 is a perspective view showing an appearance of a water cooling jacket 20.

FIG. 3 is a diagram showing a manufacturing process of the inner cylinder 3.

FIG. 4 is a diagram showing a manufacturing process of the outer cylinder 4.

5A is a partial cross-sectional view of the water cooling jacket 20, and FIG. 5B is a partial side cross-sectional view of the water cooling jacket 20.

FIG. 6 is a view showing a state in which the water cooling jacket 20 is press-fitted into the motor frame 1.

FIG. 7 is a cross-sectional view showing the structure of a conventional canned motor including a water cooling jacket.

FIG. 8 is a cross-sectional view showing a structure of a canned motor including a conventional water cooling jacket.

[Explanation of symbols]

 1 Motor Frame 2 Stator 3 Inner Cylinder 3a Throttling Groove 4 Outer Cylinder 5 Socket 6 Can 7 Rotor 8 Shaft 9 Bearing 10 Motor Frame Side Plate 11, 12 Welding Part 20 Water Cooling Jacket W Cooling Water Passage

 ─────────────────────────────────────────────────── ─── Continuation of the front page (72) Inventor Yukio Toyama 4-2-1 Motofujisawa, Fujisawa-shi, Kanagawa Inside the EBARA Research Institute, Inc. No. Ebara Densan Co., Ltd. (72) Inventor Atsushi Oyama 11-11 Haneda Asahi-cho, Ota-ku, Tokyo Within Ebara Densan Co., Ltd.

Claims (1)

[Claims] 1. A stator is fixed to an inner surface of a motor frame formed by bending a steel plate into a cylindrical shape and welding both end sides thereof, and the rotor is rotatably arranged so as to penetrate through the stator. Further, in the motor having a water cooling jacket having a structure in which a water cooling jacket is attached to the outer periphery of the motor frame, the water cooling jacket has an outer cylinder formed by forming a corrosion resistant steel plate into a cylindrical shape and a corrosion resistant steel plate into a cylindrical shape. An inner cylinder formed by forming one or a plurality of throttle grooves extending in the axial direction and projecting outward in the radial direction in the inner cylinder. The outer diameter of the formed portion is equal to or smaller than the inner diameter of the outer cylinder, and further, the inner diameter of the outer cylinder and the outer diameter of the inner cylinder are formed to have the same dimension at both ends in the axial direction. Insert the inner cylinder into the shaft A water cooling jacket characterized in that a cooling water passage formed by a plurality of spaces partitioned by the throttle groove is formed in the gap between the outer cylinder and the inner cylinder by welding and integrating both ends in the direction. The motor to drive.