JP2558156Y2 - Water-cooled sealed motor - Google Patents

Description

[Detailed description of the invention]

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a connection structure of a stator and a lead-out structure of a stator of a water-cooled hermetic motor having a cantilever structure. The present invention relates to a connection structure of a stator of a water-cooled hermetically sealed motor and a lead-out structure of a lead wire integrated with the motor.

[0002]

2. Description of the Related Art Conventionally, in a driving motor integrated with a gas compressor, a liquid pressure pump and the like, a fluid filled in the motor does not leak to the outside, and air, moisture, etc. from the outside. A sealed motor that does not penetrate the inside has been adopted.

In the water cooling of the hermetically sealed motor, it is possible to perform cooling by bringing cooling water into direct contact with a motor frame, a side cover, or the like. Particularly, it is most preferable to use the motor frame as a cooling surface. An effective and preferable structure has been adopted in which a water jacket is formed on the outer peripheral wall surface of the motor frame. Further, in order to perform maintenance when scale, rust or the like is generated, the jacket of the water jacket is cylindrical and has a detachable assembly structure.

[0004] Further, by integrating the compressor on the load side and the drive motor, it is possible to make the drive motor body a cantilevered structure in the compressor mounted on the pedestal. That is,
A drive shaft rotatably disposed on a bearing on the compressor side is extended toward the drive motor side to form a cantilever structure, and a rotor of the drive motor is fixedly fitted on the shaft to form a bearing for the drive motor. The structure which excluded is adopted. Therefore, it is possible to eliminate the mechanical friction loss of the bearing and the like, thereby contributing to higher efficiency as a whole.

[0005]

However, in the cylindrical water jacket structure of the prior art, in order to make the water jacket removable, the lead wire of the stator wire loop is required. It is inevitable to adopt a structure in which the position of the terminal block that can be derived is arranged on the load side of the drive motor. Therefore, a space for leading the lead wire of the stator wire loop and a space for connecting the wire phases are also provided on the load side of the stator.

Therefore, in order to interpose the space, the stator and the rotor are disposed apart from the load side, and the rotating shaft must be extended by the space. This is undesirable in design as a cantilever structure.

Further, since the position of the terminal block of the lead wire is restricted to the load side as described above, the cooling area on the frame surface of the drive motor is also reduced from the terminal block located at the load mounting portion to the frame. It was limited to the vicinity of the other end, making it difficult to expand further.

[0008] Further, when the cylindrical water jacket is attached or detached, if there is an installation leg on the drive motor side, it becomes a hindrance. Therefore, as described above, the drive motor body has to adopt a cantilever structure. Did not. Therefore, the size of the driving motor has been limited to a small capacity as long as the motor body has a cantilever structure.

The present invention has been made in view of the drawbacks of the prior art.
Water-cooled sealing that maximizes the area of the motor frame that can be used as a cooling surface, increases the capacity, and is easy to maintain and economical, while reducing the size and simplifying the shape of the sealed cantilevered motor of the rotor. An object of the present invention is to provide a structure of a type motor.

[0010]

According to the present invention, in order to achieve the technical object, a cooling structure for a sealed motor is provided. (1) A substantially circular flange provided on the outer peripheral sides of both ends of a frame of the sealed motor is provided. (2) A point at which a horizontal rail is provided to connect the flanges at the same height as the flange height. (3) A horizontal rail is wound along the outer peripheral surface of the flange, and the end face is wound at the horizontal rail. A water jacket made of a flexible thin material formed so as to be able to face on the surface; and (4) the horizontal rail on the side adjacent to one flange located on the opposite side to the load mounting portion. The present invention is characterized in that a connection portion of a stator is provided together with a sealed terminal block, and a lead wire of a stator wire loop can be led out through the terminal block.

In this case, the lead wire of the stator wire loop wound around the stator core of the electric motor, the connection between each wire loop and the wire wheel phase, etc., are disposed on the side opposite to the load mounting portion. The large-capacity motor has a mounting leg at a position near the lower side of the flange, and the mounting leg is configured to be detachable.

[0012]

According to this technical means, the end faces of the water jackets are opposed to each other on the horizontal rail surface by using one or a plurality of band-shaped clamping metal fittings, and both end portions of the water jackets are provided. Is fastened to the outer peripheral surface of the flange by a band-like band, so that the outer peripheral surface of the motor frame, the water jacket formed by the flange and the water jacket has a liquid-tight structure. Further, since it is possible to provide a cooling water inlet / outlet together with the sealed terminal block on the horizontal rail, the cooling water can be circulated through the water jacket to directly cool the outer peripheral surface of the motor frame.

In view of the above, the sealed terminal block is provided on the side of the cross rail, which is located on the side of the flange opposite to the load mounting portion, and the stator and the rotor are arranged close to the load mounting portion. Can be set up. In addition, the rotating shaft for the cantilevered rotor that extends from the load-side bearing does not needlessly extend in the axial direction, and contributes to shortening and diameter reduction, and also contributes to vibration resistance. Can be easily designed.

According to the present invention, the connection between the lead wire of the stator wire loop wound around the fixed iron core of the electric motor, each wire loop and the wire wheel phase is disposed on the side opposite to the load mounting portion. , Wiring connection becomes easy. Further, according to the present invention, since the mounting legs are provided on the flange, the size of the motor body can be increased, and the mounting legs located on the side opposite to the load mounting portion can be detachably mounted. With this configuration, the water jacket can be easily attached and detached, and maintenance work such as scale, rust and the like attached to the outer peripheral surface of the motor frame can be facilitated.

[0015]

BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 is a block diagram showing an embodiment of the present invention; However, unless otherwise specified, dimensions, materials, shapes, relative arrangements, and the like of the components described in this embodiment are not intended to limit the scope of the present invention thereto, but are merely illustrative examples. Not just.

FIG. 1 is a front sectional view showing the structure of a sealed motor having a cantilever structure of a rotor according to an embodiment of the present invention, and FIG. 2 is a side sectional view taken along the line YY in FIG. is there. Reference numeral 1 denotes a gas compressor serving as a load, and reference numeral 2 denotes a water-cooled hermetic motor, which is directly connected to the compressor 1 via a load-side flange 4a and is integrally formed therewith.

Reference numeral 3 denotes a motor frame having substantially circular flanges 4a and 4b on outer peripheral sides of both ends of the motor frame 3, and furthermore, the flanges 4a and 4b have substantially the same height as the flanges 4a and 4b. , 4b.
Here, the flanges 4a and 4b are flanges located on the compressor 1 side and on the opposite side, respectively.

Reference numeral 6 denotes a flexible thin-film water jacket, which is wound along the outer circumference of the flanges 4a and 4b and is gripped by the tightening band 12, and the end faces of the water jacket 6 are connected to each other. It is formed so as to be able to face on the surface of the cross rail 5, and its end is attached by a band-shaped metal fitting 11 which narrows a watertight packing.

Thus, a water jacket space 7 surrounded by the outer peripheral surface of the motor frame 3, the inner wall surfaces of the flanges 4a and 4b, and the water jacket 6 and partitioned by the horizontal rail 5 is provided.
Is formed. A cooling water suction port 9 and a discharge port 10 are arranged side by side on the compressor 1 side of the horizontal rail 5, and the cooling water space 7 is provided.
It is connected to water supply and drainage. A fold 13 is provided on the outer peripheral surface of the motor frame 3 so that the cooling water can flow uniformly on the surface of the frame 3 and meander.

On the other hand, the internal structure of the motor 2 includes a stator 20,
And a rotor 25. The stator 20
Is a stator core 21 inserted and fixed on the inner peripheral surface of the motor frame 3, and a stator coil 2 wound around the core 21.
2 The rotor 25 is fitted on a tapered rotary shaft 26 which is supported as a cantilever by a bearing 27 fixed to a mounting side wall 28 of the compressor 1.

The connection between the stator wire loops 22, between the phases, and the lead wire is performed at a connection portion 23 provided near the flange 4b located on the opposite side to the load mounting portion. Further, a sealing terminal block 24 made of an insulating material is disposed on the flange 4b side of the horizontal rail 5, and the lead wire and the power supply are connected via a sealing terminal 8 penetrating the sealing terminal block. .

Since the connection portion 23 and the sealed terminal block 24 are provided near the flange 4b as described above, the stator core 21 and the rotor 25 have an unnecessary space interposed between them and the compressor 1. It is possible to arrange them close enough without any problem.

Next, when the capacity of the water-cooled hermetic motor 2 becomes large and the weight of the motor main body 2 cannot be cantilevered simply by being attached to the load 1 via the flange 4a, the mounting feet 19 are provided. . The mounting leg 19 is connected to the flange 4b.
The cover 18 is provided under the outer periphery of the cover 18 so as to be assembled.

Since the water-cooled hermetic motor 2 is constructed as described above, the maintenance feet 19 are disassembled and removed if they are assembled during maintenance, and then the band-shaped fittings 11.
By removing the tightening band 12 and finally the water jacket 6,
Easily removes scale, rust, etc. attached to the inner surface of the water jacket 7
Can be cleaned. Since the assembly can be performed in the reverse order, the maintenance and inspection can be easily performed by ordinary tools and workers.

[0025]

As described above, according to the present invention, in a water-cooled hermetic motor, a horizontal rail is connected between both end flanges along the axis, and the end face of the water jacket is connected to the horizontal rail. A water jacket is wound around the outer periphery of the flange so as to face the outer surface of the flange, and a water jacket is formed. Since the terminal block and the connection portion of the stator are provided, the connection work between the lead wire of the stator wire loop and the terminal of the sealed terminal block can be easily performed. Moreover, the water-cooled seal of the cantilever structure of the rotor in which the stator and the rotor are arranged close to the load side without interposing an unnecessary space between the load side wall and the stator and the rotor in the load mounting portion. Type motor can be provided. Further, the entire circumference of the motor frame except for the horizontal rail can be used as a cooling surface for cooling water, and as a result, it is possible to provide a small-sized and large-capacity electric motor. Further, even when a large-capacity motor is required, an installation leg is provided so as to be assemblable below the flange near the side opposite to the load mounting portion, and cantilever support of the frame and stator of the motor. As a result, it is possible to provide a large-capacity water-cooled hermetic motor that is reasonable in structure. Further, according to the present invention, even in the case of maintenance of the water-cooled hermetic motor, merely removing the water jacket is effective in reducing the scale and water adhered to the outer peripheral surface of the frame.
An electric motor capable of easily removing rust or the like can be provided. And so on.

[Brief description of the drawings]

FIG. 1 is a sectional front view of a water-cooled hermetic motor according to an embodiment of the present invention.

FIG. 2 is a side sectional view taken along the line YY of FIG. 1;

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Load 2 Sealed motor 3 Frame 4a, 4b Flange 5 Side rail 6 Water jacket 19 Installation leg 20 Stator 23 Connection part 24 Sealed terminal block

Claims (3)

(57) [Scope of request for utility model registration] 1. A substantially circular flange provided on the outer peripheral sides of both ends of a frame of a sealed motor having a cantilever structure with a rotor, and a horizontal rail connected between the flanges at the same height as the flange height. A water jacket made of a flexible thin material wound along the outer periphery of the flange and having end faces facing each other on the horizontal rail surface, and located on a side opposite to the load mounting portion. A water-cooled hermetic motor characterized in that a connection portion of a stator is provided together with a sealed terminal block on the side rail adjacent to one of the flanges. 2. The water cooling system according to claim 1, wherein a connection portion of the stator wire loop wound around the fixed core of the electric motor, such as a connection between each wire loop and the wire wheel phase, is disposed on a side opposite to the load mounting portion. Sealed motor 3. The water-cooled hermetically sealed motor according to claim 1, further comprising a mounting leg at a position near the lower side of the flange, wherein the mounting leg is configured to be detachable.