JP2000217296A - Sealing-liquid type underwater electric machine - Google Patents

Abstract

PROBLEM TO BE SOLVED: To obtain an inexpensive sealing-liquid type underwater electric machine that has sufficient corrosion resistance and structural strength. SOLUTION: A plurality of columnar projection parts 7b are formed at the side end of the load of a bracket 7 at the opposite side of the load, a cover 18 is fixed to the projection end of the plurality of columnar projection parts 7b by a clamping screw 21, at the same time, a collar 13a of a closed-end pressure regulation cylinder 13 is mounted to the inner surface of a bottom part 18a of the cover 18 for watertightly blocking a through-hole 18b that is formed on the bottom surface of the cover 18, an opening end edge 18c of the cover 18 is brought into contact with a frame 3, an end plate 5, and a ring seal 19 fitted into a gap which is formed by an outer periphery 7c of the bracket 7 at the opposite side of the load for watertightly protecting the exposed part of the end at the load side, at the same time, a projection part 18e is formed on or near a contact surface with the plurality of columnar projection parts 7b in the cover 18, and an installation leg for supporting the load of a sealing- liquid type underwater electric machine is composed of the projection part 18e and the columnar projection part 7b.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a sealed type underwater motor provided with a protective cover for protecting a non-load side bracket from outside water in a watertight manner.

[0002]

2. Description of the Related Art FIG. 4 is a diagram showing a cross section of a conventional sealed type underwater motor. In the drawing, 1 is a stator core, 2 is a stator winding wound around the stator core 1, and 3 is a cylindrical cylindrical frame having the stator core 1 fitted on the inner peripheral surface. Are a pair of end plates welded to both ends of the cylindrical frame 3, respectively;
Is a load side bracket screwed to the end plate 4, and 6 a is a hollow boss formed at the center of the load side bracket 6.

Reference numeral 7 denotes a non-load side bracket made of cast iron screwed to the end plate 5, 7a and 7b are hollow boss portions provided at the center of the non-load side bracket 7 so as to communicate with each other, 8 Is a rotor core paired with the stator core 1, 9 is a rotor shaft fitted to the rotor core 8, 10 is a copper alloy of a low hardness material fitted to the inner peripheral surface of the hollow boss 6a. A cylindrical bearing body 11 is a cylindrical bearing body made of a copper alloy of a low-hardness material fitted on the inner peripheral surface of the hollow boss 7a, and cooperates with the bearing body 10. Thus, the rotor shaft 9 is rotatably supported.

[0004] Reference numeral 12 denotes a thrust bearing.
A thrust disc 12a fitted to the thrust receiver 12b and a seat 12c supporting the thrust receiver 12b.
Are supported by the non-load side bracket 7.

Reference numeral 13 denotes a bellows-structured bottomed pressure adjusting cylinder as a pressure adjusting device mounted on the inner peripheral surface of the hollow boss portion 7b.
Is disposed between the rotor shaft 9 and the load side bracket 6,
An oil seal that seals the shaft between them. Reference numeral 15 denotes a liquid injection hole provided at a predetermined position of the load side bracket 6,
It is usually sealed with a stopper (not shown). The tubular frame 3 and the pair of end plates 4 and 5 and the load-side bracket 6 and the non-load-side bracket 7 form a casing 16 of the liquid-sealed underwater motor. A sealed liquid 17 in which antifreeze is mixed with fresh water is sealed.

The outer cover 16 is usually coated with a rust-preventive paint. However, the outer cover 16 is not suitable for applications in which the use environment of the sealed-type underwater motor is severe, such as the corrosiveness of groundwater is remarkable.
Must be made of a corrosion-resistant material, such as stainless steel. In particular, since the anti-load side bracket 7 is required to have rigidity and has a structure in which the bottomed pressure adjusting cylinder 13 is mounted,
Stainless steel casting is used, it becomes extremely expensive,
This contributed to the cost increase.

As a countermeasure against this, for example, Japanese Patent Laid-Open No. 5-30
Japanese Patent No. 4741 discloses a sealed-type underwater motor provided with a non-load-side bracket having a structure obtained by pressing a stainless steel plate. FIG. 5 is a diagram showing a side cross section of the anti-load side bracket portion in the sealed type submersible motor disclosed in Japanese Patent Application Laid-Open No. Hei 5-304741. In FIG. The outer side plate 37 is formed with a diaphragm chamber 37c at the center thereof. The inner side plate 36 is fitted to the inner periphery of the non-load side frame side plate 30, and the outer side plate 3
7 is fixed to the non-load side frame side plate 30 by screwing a stud bolt 40 to a screw member 39 fixed to the non-load side frame side plate 30.

An O-ring 57 is fitted in a space defined by the inner side plate 36, the outer side plate 37, and the intermediate plate 41, and an O-ring 58 is also fitted between the non-load side frame side plate 30 and the inner side plate 36. And the motor filling fluid is sealed. Also, the diaphragm chamber 37c of the outer side plate 37
Accommodates a diaphragm 52. The diaphragm 52 is fixed by sandwiching the outer peripheral edge portion 52c between the outer side plate 37 and the end cover 55. The end cover 55 is fitted to the outer peripheral portion of the outer side plate 37, and the screw 56
The stud bolt 40 is fastened and fixed.

The sealed type submersible motor shown in FIG. 5 is manufactured by pressing the non-load side bracket 38 from a stainless steel plate, so that it is excellent in corrosion resistance against external water and compared with a stainless steel casting. Although it has the feature that it can be manufactured at low cost, on the other hand, the structure becomes complicated, for example, the number of parts increases and the number of sealing locations increases, as compared with an integrated casting.

[0010]

The conventional liquid-sealed underwater motor is constructed as described above, that is, since the stainless steel casting is used for the non-load side bracket,
There were problems such as being extremely expensive. Further, when the non-load-side bracket is manufactured from a stainless steel plate by press working, there are problems such as an increase in the number of parts, an increase in the number of hermetically sealed portions, and a complicated structure.

SUMMARY OF THE INVENTION The present invention has been made to solve the above-described problems, and has as its object to provide an inexpensive liquid sealed type underwater motor having sufficient corrosion resistance and structural strength.

[0012]

According to a first aspect of the present invention, there is provided a liquid sealed type underwater motor comprising: a tubular frame surrounding and supporting a stator; a pair of end plates provided at both ends of the tubular frame; A rotor that forms a pair with a stator, a load-side bracket and a non-load-side bracket that are disposed adjacent to and correspond to each of the pair of end plates and rotatably support a rotation shaft of the rotor via a bearing; And in a liquid-sealed underwater motor having a bottomed cylindrical cover that surrounds the anti-load side bracket to block outside water, the anti-load side bracket has a protruding portion that protrudes toward the anti-load side, The bottom inner surface of the cover is in contact with the protruding end of the protruding portion, and the cover is fixed to the protruding end.

[0013] The liquid-sealed underwater motor according to the second invention comprises:
A cylindrical frame surrounding and supporting the stator, a pair of end plates provided at both ends of the cylindrical frame, a rotor paired with the stator, and a pair of adjacent end plates arranged corresponding to the pair of end plates, respectively; A load-side bracket and a non-load-side bracket that are provided and rotatably support the rotating shaft of the rotor via a bearing,
A bottomed cylindrical cover having a bottom with a through hole formed therein and surrounding the anti-load side bracket to block outside water, and is fixed to a bottom inner surface of the cover so as to close the through hole. In a sealed liquid type underwater motor provided with a pressure regulating device that is deformed in accordance with a pressure difference between an enclosed liquid enclosed in the cover and external water, the anti-load side bracket has a protruding portion that protrudes toward an anti-load side. The pressure regulating device is constituted by a bottomed pressure regulating cylinder having elasticity and a flange at an open end, and a ring-shaped holding plate is provided between a projecting end of the projecting portion and a bottom inner surface of the cover. Is arranged, and the flange is pressed against the inner surface of the bottom by the pressing plate by fixing the cover to the protruding end.

A liquid-sealed underwater motor according to a third aspect of the present invention comprises:
A cylindrical frame surrounding and supporting the stator, a pair of end plates provided at both ends of the cylindrical frame, a rotor paired with the stator, and a pair of adjacent end plates arranged corresponding to the pair of end plates, respectively; A load-side bracket and a non-load-side bracket that are provided and rotatably support the rotating shaft of the rotor via a bearing;
And a sealed type submersible motor having a bottomed cylindrical cover surrounding the non-load side bracket to block the outside water from outside water, wherein the anti-load side bracket has a projection protruding toward the non-load side, The end plate on the non-load side of the cylindrical frame is disposed and fixed inside a predetermined length from the non-load side end of the cylindrical frame, and is fixed to the side of the outer periphery of the non-load side bracket that is in contact with the end plate. A ring-shaped recess is formed on the end plate, and the ring-shaped recess is formed between the outer circumference of the anti-load side bracket and the inner circumference of the anti-load side end of the tubular frame in a state where the anti-load side bracket is fixed to the end plate. A gap is formed, the end plate is used as a bottom surface, an elastic seal ring is attached to a gap formed by the concave portion and the inner periphery of the non-load side end, and the inner surface of the bottom of the cover projects from the projecting portion. Abutting against the end The cover is fixed to the cover so that the opening edge of the cover is inserted into the gap, and the seal ring is pressed with a predetermined contact pressure at the opening edge to seal the inside and outside of the cover in a watertight manner. .

A sealed underwater motor according to a fourth aspect of the present invention
A cylindrical frame surrounding and supporting the stator, a pair of end plates provided at both ends of the cylindrical frame, a rotor paired with the stator, and a pair of adjacent end plates arranged corresponding to the pair of end plates, respectively; A load-side bracket and a non-load-side bracket that are provided and rotatably support the rotating shaft of the rotor via a bearing,
And in a liquid-sealed underwater motor having a bottomed cylindrical cover that surrounds the anti-load side bracket to block outside water, the anti-load side bracket has a protruding portion that protrudes toward the anti-load side, The bottom inner surface of the cover is brought into contact with the protruding end of the protruding portion to fix the cover on the protruding end, and the bottom outer surface of the cover at or near the surface facing the protruding end has an anti-load side. A protruding leg or a leg member is provided.

A liquid-sealed underwater motor according to a fifth aspect of the present invention comprises:
In the liquid-sealed underwater motor according to a fourth aspect of the present invention, the leg member is provided with a tightening screw for screwing the bottomed cylindrical cover to the protruding end of the protruding portion of the non-load-side bracket from the bottom outer surface of the cover. It is disposed in the vicinity and has a tip protruding further to the non-load side than the screw head of the tightening screw.

A liquid-sealed underwater motor according to a sixth aspect of the present invention comprises:
In the liquid-sealed underwater motor according to the fourth invention, the leg member is screwed and fixed to the protruding end of the protruding portion of the non-load-side bracket via a bottomed cylindrical cover with a tightening screw. .

A liquid-sealed underwater motor according to a seventh aspect of the present invention comprises:
The liquid-sealed underwater motor according to any one of the first to sixth aspects, wherein the projecting portion projecting from the non-load side end of the anti-load side bracket is formed by a plurality of columnar projecting portions.

[0019]

DESCRIPTION OF THE PREFERRED EMBODIMENTS Embodiment 1 First Embodiment A first embodiment of the present invention will be described with reference to FIGS. FIG. 1 is a view showing a cross section of the sealed type underwater motor, and FIG. 2 is a view showing a partial cross section of the counter-load side end of the sealed type underwater motor shown in FIG. In the figure, those denoted by the same reference numerals as those of the conventional example indicate the same or equivalent parts as those of the conventional example.

1 and 2, reference numeral 1 denotes a stator core;
Is a stator winding wound around the stator core 1, 3 is a cylindrical tubular frame having the stator core 1 fitted on the inner peripheral surface, 4,
5 is a load side fitted to both ends of the cylindrical frame 3, respectively.
The end plate 5 is an anti-load side end plate, and the end plate 5 is fixed at a position slightly inside the anti-load end 3a of the cylindrical frame 3 and inside a predetermined dimension. Reference numeral 6 denotes a load-side bracket made of cast iron fitted to the end plate 4, and has a hollow boss portion 6a.
Is provided. Reference numeral 6A denotes an upper cover made of a stainless steel casting, which is screwed to the end plate 4 to block the end plate 4 from outside water.

Numeral 7 denotes a non-load side bracket made of cast iron screwed to the end plate 5. The non-load side bracket 7 has a hollow boss portion 7a and a plurality of columnar projecting portions projecting from the non-load side end. 7b, a ring-shaped groove 7d formed on the outer periphery 7c of the non-load side bracket 7. The plurality of columnar protrusions 7
A screw hole 7e for screwing and fixing the cover 18, which will be described later, is formed at the protruding end of b.

Reference numeral 8 denotes a rotor core which is paired with the stator core 1;
9 is a rotor shaft fitted to the rotor core 8; 10 is a cylindrical bearing made of a low-hardness copper alloy fitted to the inner peripheral surface of the hollow boss 6a; Load side bracket 7
A cylindrical bearing body formed of a copper alloy of a low hardness material fitted to the inner peripheral surface of the hollow boss bottom 7a installed at
The rotor shaft 9 is supported by the bearing bodies 10 and 11. Reference numeral 12 denotes a thrust bearing, which includes a thrust disk 12a fitted to the rotor shaft 9 and a thrust support 12b opposed to the thrust disk 12a via a water film, and a thrust support 12b.
The receiving seat 12c is supported by the non-load side bracket 7.

Reference numeral 13 denotes a bottomed pressure regulating cylinder having a bellows structure as a pressure regulating device which is disposed on an inner surface of a bottom portion 18a of a cover 18 to be described later and operates in accordance with a pressure difference between the sealed liquid 17 and the external water. A flange 13a is formed at an opening edge of the bottom pressure adjusting cylinder 13, and a flange 13a is formed on a side of the flange 13a opposite to the opening edge.
Flexible projections 13b are formed on the entire circumference of a.

An oil seal 14 is disposed between the rotor shaft 9 and the load-side bracket 6, and seals between the two. Reference numeral 15 denotes a liquid injection hole provided at a predetermined position of the load-side bracket 6.
An encapsulation liquid 17 in which antifreeze is mixed with clear water is enclosed.
In addition, the liquid injection hole 15 is normally sealed with a stopper (not shown).

Reference numeral 18 denotes a bottomed cylindrical cover that surrounds the non-load-side exposed portion of the non-load-side bracket 7, and is formed by pressing a stainless steel plate. The cover 18 has a through hole 18b formed in a bottom 18a, an opening edge 18c, and a plurality of columnar protrusions 7.
A screw insertion hole 18d is formed at a position corresponding to the screw hole 7e formed at the protruding end of b. Further, the cover 18
Near the contact surface with the columnar protrusion 7b,
A convex portion 18e as a leg protruding from the front side of the bottom portion 18a is formed, and the convex portion 18e can be used as a mounting leg.

Reference numeral 19 denotes an elastic seal ring (ring-shaped gasket) mounted in the ring-shaped groove 7d of the non-load-side bracket 7. That is, in a state where the non-load-side bracket 7 is fixed to the end plate 5, the inner periphery of the non-load-side end 3 a of the cylindrical frame 3 and the outer periphery 7 c of the non-load-side bracket 7.
, A gap continuous with the entire periphery is formed, and a ring-shaped groove 7d is formed on the outer peripheral surface 7c on the surface in contact with the end plate 5, and the seal ring 19 has the end plate 5 as the bottom surface, It is mounted so as to fill a ring-shaped space formed by the inner peripheral wall of the side end 3a and the ring-shaped groove 7d.

Reference numeral 20 denotes a ring-shaped pressing plate which presses and fixes the flange 13a of the bottomed pressure regulating cylinder 13 to the inner surface of the bottom portion 18a of the cover 18, and has a bottomed pressure regulating cylinder near the inner diameter side of the pressing plate 20. A ring-shaped recess 20a that engages with the protrusion 13b of the thirteen is formed on the entire circumference on the inner diameter side, and a screw hole 7e formed on the contact surface of the plurality of columnar protrusions 7b with the cover 18 near the outer diameter side. The screw insertion holes 20b are formed at the corresponding positions.

Reference numeral 21 denotes a cover 18 and a columnar projecting portion 7b.
A tightening screw 22 for fixing the cover 18 to the protruding end of the columnar projection 7b together with the presser plate 20 with the presser plate 20 interposed therebetween. A tightening screw 22 is tightened together with a tightening screw 21 for fixing the cover 18 in a watertight manner. Seal washer. In addition, the outer cover 23 is formed by the cylindrical frame 3, the upper cover 6 </ b> A, and the cover 18.

Next, the bracket 7 on the non-load side of the cover 18
The method of attaching the cable to the device will be described. First, the holding plate 20 is placed on the protruding ends of the plurality of columnar protruding portions 7b protruding on the anti-load side of the anti-load side bracket 7, and the flange 13a of the bottomed pressure regulating cylinder 13 is placed.
On the holding plate 20, the ring-shaped projection 13b of the flange 13a.
And the ring-shaped concave portion 20a of the holding plate 20 are aligned with each other. The cover 18 is covered with the cover 18 and this is screw-fixed to the projecting end of the columnar projecting portion 7b together with the seal washer 22 with the fastening screw 21.

That is, as apparent from FIG. 2, the flange 13a of the bottomed pressure regulating cylinder 13 is pressed against the inner surface of the bottom 18a of the cover 18 by the pressing plate 20, and the pressing plate 20 is pressed against the inner surface of the bottom 18a by a plurality of columnar projections. The pressure regulating cylinder 13 with the bottom is clamped between the protruding end surfaces of the portion 7b and the fastening screw 21 to fix the bottomed pressure regulating cylinder 13 to the bottom 1 of the cover 18.
8a.

As a result, in a state where the bottomed pressure regulating cylinder 13 is attached to the inner surface of the bottom portion 18a of the cover 18 by the holding plate 20, the cover 18 abuts on the projecting ends of the plurality of columnar projecting portions 7b and is fixed. Is done. The bottomed pressure regulating cylinder 13 shuts off the sealed liquid 17 and external water that can flow freely through the through hole 18b.

Further, as is apparent from FIG. 2, the opening edge 18c of the cover 18 is connected to the non-load side end 3 of the cylindrical frame 3.
a into the narrowly formed ring-shaped gap between the inner circumference of a and the outer circumference 7 c of the non-load side bracket 7,
The exposed portion of the seal ring 19 is pressed by the opening edge 18c by fixing the inner surface of 8a to the projecting end of the columnar projecting portion 7b with a screw 21. The seal ring 19 is elastically deformed by being pressed by the opening edge 18c. However, the seal ring 19 is confined in the gap and has no escape area, presses against the surrounding wall surface, and keeps the contact surface with the seal ring 19 watertight.

That is, the infiltration of external water is caused by the contact surface between the seal ring 19 and the inner periphery of the non-load side end 3a and the seal ring 1
The member at the non-load side end including the anti-load side bracket 7 is shut off by a contact portion between the opening 9 and the opening edge 18c, and the member at the non-load side end is covered by the cover 18 to protect it in a watertight manner.

When the anti-load side of the sealed type underwater motor is placed on the installation surface, the projection 18e supports the load of the sealed type underwater motor as an installation leg. By arranging the root portion of the convex portion 18e on the surface facing the protruding end of the columnar protruding portion 7b or in the vicinity thereof, the deformation of the cover 18 can be suppressed, and the watertightness can be improved. That is, it is effective in making the cover 18 thinner.

Embodiment 2 Embodiment 2 of the present invention will be described with reference to FIG. FIG. 3 is a view showing a partial cross section of the non-load side end of the sealed type underwater motor. In FIG. 3, the bottomed cylindrical cover 18 is manufactured by pressing a stainless steel plate, and is different from that shown in FIGS. 1 and 2 except that the convex portion 18e is not formed. Have the same shape.

Numeral 24 is a bottomed cylindrical leg member projecting to the non-load side of the cover 18, and a screw insertion hole 24a is formed in the center of the bottom of the leg member 24.
In addition, the screw insertion hole 24a is fixed in a watertight manner by welding so as to coincide with the screw insertion hole 18d. Then, the cover 18 is fixed to the protruding ends of the plurality of columnar protruding portions 7b from the side of the open end 24b of the leg member 24 by the fastening screw 21 via the seal washer 22, the leg member 24, and the holding plate 20. An installation leg is formed with the installation end face 24b.

In such a construction, the open end 24b of the leg member 24 supports the installation load of the liquid-sealed underwater motor, and the entire load received by the leg member 24 is transmitted to the columnar projecting portion 7b to cover the underwater motor. Since the cover 18 is not affected, the thickness of the cover 18 can be reduced.

In the second embodiment, in order to fix the bottomed cylindrical leg member 24 to the bottom 18a of the cover 18 in a watertight manner, the screw insertion hole 24a is welded so as to coincide with the screw insertion hole 18d. The fixing of the leg member 24 to the cover 18 is not necessarily limited to welding, and a water sealing material (not shown) is applied to the contact surface between the leg member 24 and the cover 18 to form the leg member 24. May be connected to the columnar projecting portion 7b with the fastening screw 21 via the cover 18 and the holding plate 20, and may be fixed.
Can be made thinner.

In the second embodiment, the cover 1
Although the bottomed cylindrical leg member 24 protruding to the non-load side of 8 is used, a thick bolt (not shown) is used as the tightening screw 21, and the head of this bolt is used as the leg member. Even if the head of the bolt projecting to the non-load side of the cover 18 supports the installation load of the sealed type submersible motor, the entire load is transmitted from the head of the bolt to the columnar projecting portion 7b. In order not to affect, the thickness of the cover 18 can be reduced, and the bottomed cylindrical leg member 24 as a separate piece is not required.

As described above, in the sealed type underwater motor of the first or second embodiment, the anti-load side bracket 7 which is a structure requiring structural strength is replaced with the stainless steel cover 18 having excellent corrosion resistance. And a plurality of columnar protrusions 7b are formed on the non-load-side bracket 7, and the cover 18 is formed with the protrusion ends of the plurality of columnar protrusions 7b. Since the support and fixing are performed to reduce the weight of the anti-load-side bracket 7, the anti-load-side bracket 7 can be cast from an inexpensive material such as cast iron. It can be manufactured at low cost.

In the above-mentioned liquid-sealed underwater motor,
The example in which the jacket 23 that is exposed to corrosive external water is made of stainless steel plate except for the upper cover 6A is shown, but these are not limited to stainless steel plate. By selecting an appropriate anticorrosion steel sheet according to the above, a highly reliable one can be manufactured at a lower cost.

[0042]

Since the present invention is configured as described above, it has the following effects.

A protruding portion is formed on the non-load side bracket, and the bottom inner surface of the bottomed cylindrical cover surrounding the anti-load side bracket to block outside water is brought into contact with the protruding end of the protruding portion. Since the cover is fixed to the protruding end, the installation load can be received by the projection, and the anti-load-side bracket can be manufactured from an inexpensive casting material, while preventing deformation of the cover due to the installation load. The cover can be made extremely thin, and there is an effect that an inexpensive liquid sealed type underwater motor with a simple structure can be obtained.

Further, the pressure regulating device is constituted by a bottomed pressure regulating cylinder having elasticity and a flange at an open end, and is provided between the projecting end of the projecting portion formed on the non-load side bracket and the bottomed cylindrical cover. Since a ring-shaped pressing plate is disposed on the cover, and the cover is fixed to the protruding end, the flange portion is pressed against the inner surface of the bottom with the pressing plate and fixed. The mounting structure can be simplified while ensuring the watertightness of the mounting portion, and as a result, an inexpensive liquid-sealed underwater motor can be obtained.

Further, a ring-shaped concave portion is formed on the side of the outer peripheral surface of the non-load-side bracket that is in contact with the end plate, and a ring-shaped concave portion is formed between the outer periphery of the anti-load-side bracket and the inner peripheral surface of the opposite end of the frame. Forming a gap, the end plate as a bottom surface,
A seal ring having elasticity is attached to a gap formed by the concave portion and the inner periphery of the non-load side end, and a bottom inner surface of the bottomed cylindrical cover is brought into contact with a protruding end of the protruding portion of the anti-load side bracket. Along with fixing the cover to the protruding end,
Since the cylindrical opening edge of the cover is inserted into the gap and the seal ring is pressed with a predetermined contact pressure to seal the inside and outside of the cover in a watertight manner, even if the cover is thinned, it can be securely sealed, There is an effect that an inexpensive liquid-sealed underwater motor having high reliability in watertightness can be obtained.

Also, a protruding portion is formed on the anti-load side bracket to protrude toward the anti-load side, and the bottom inner surface of the bottomed cylindrical cover is brought into contact with the protruding end to fix the cover to the protruding end. Since a leg or a leg member protruding toward the non-load side is provided on the bottom outer surface of the cover at or near the surface facing the protruding end, the leg or the leg member is used as a mounting leg, All or most of the installation load received by the leg members is transmitted to the projecting portion, and the effect of the deformation of the cover on the watertight performance is small, and the effect of obtaining a liquid-sealed underwater motor capable of thinning the cover is obtained. is there.

Further, a leg member is provided near the tightening screw for screwing and fixing the bottomed cylindrical cover to the projecting end of the projecting portion of the non-load side bracket from the outer surface of the bottom of the cover. Since the screw head has a tip protruding further to the load side than the screw head, during installation, the screw head of the tightening screw is protected from contacting the mounting surface, and the tightening screw has an installation load. Is not added, so that the tightening screw is prevented from being loosened. As a result, not only the cost can be reduced due to the extremely thin cover, but also the reliability of fixing the cover can be improved. There is an effect that an underwater motor can be obtained.

Further, since the leg member is screwed to and fixed to the protruding end of the protruding portion of the non-load side bracket via a bottomed cylindrical cover with a tightening screw, the leg member is fixed to the cover. Therefore, it is not necessary to perform welding or the like, so that not only the number of manufacturing steps is reduced, but also the cover can be made extremely thin, and there is an effect that a sealed-type underwater motor that can reduce manufacturing and material costs can be obtained.

Further, since the projecting portion projecting from the non-load side end of the non-load side bracket is formed by a plurality of columnar projecting portions, the weight can be reduced as compared with the case where the projecting portions are integrally formed, and as a result, There is an effect that a light and inexpensive liquid-sealed underwater motor can be obtained.

[Brief description of the drawings]

FIG. 1 is a diagram illustrating a side cross section of a liquid-sealed underwater motor according to a first embodiment of the present invention.

FIG. 2 is a view showing a partial cross section of a non-load side end of the liquid sealed type underwater motor shown in FIG. 1;

FIG. 3 is a diagram showing a partial cross section of an anti-load side end of a sealed type submersible motor as a second embodiment of the present invention.

FIG. 4 is a diagram showing a side cross section of a conventional liquid-sealed underwater motor.

FIG. 5 is a diagram showing a partial cross section of another conventional sealed-type underwater motor.

[Explanation of symbols]

3 Cylindrical frame, 3a Non-load end, 5 end plate, 7
Non-load side bracket, 7b pillar-shaped protrusion, 7d ring-shaped groove, 13 bottomed pressure regulating cylinder, 13a flange, 13b flexible projection, 18 cover, 18a bottom, 18b through hole, 1b
8c opening edge, 18e convex, 19 seal ring,
20 holding plate, 20a ring-shaped recess, 21 tightening screw, 24 leg members

 ──────────────────────────────────────────────────続 き Continuing on the front page (72) Inventor Hiroyuki Sakashita 1-1-1 Imajuku Higashi, Nishi-ku, Fukuoka City, Fukuoka Prefecture Inside Fukuishi Semicon Engineering Co., Ltd. F-term (reference) Fukuishi Semicon Engineering Co., Ltd. 5H605 AA02 BB06 CC01 CC02 CC04 CC05 DD03 DD17 DD32 DD35 EA02 EB03 GG02 GG06 GG10 GG12 GG16

Claims (7)

[Claims] A tubular frame surrounding and supporting the stator;
A pair of end plates disposed at both ends of the cylindrical frame, a rotor forming a pair with the stator, and a rotor disposed adjacent to and corresponding to each of the pair of end plates and via a bearing. A sealed-type underwater motor including a load-side bracket and a non-load-side bracket that rotatably supports a rotating shaft, and a bottomed cylindrical cover that surrounds the anti-load-side bracket to shut off the outside water. A projecting portion projecting toward the anti-load side is formed on the anti-load side bracket, and an inner bottom surface of the cover is brought into contact with a projecting end of the projecting portion to fix the cover to the projecting end. Type underwater motor. 2. A cylindrical frame surrounding and supporting the stator,
A pair of end plates disposed at both ends of the cylindrical frame, a rotor forming a pair with the stator, and a rotor disposed adjacent to and corresponding to each of the pair of end plates and via a bearing. A load-side bracket and a non-load-side bracket rotatably supporting a rotating shaft, a bottomed cylindrical cover having a bottom with a through hole formed therein and surrounding the anti-load-side bracket to block external water; and In a sealed type submersible motor including a pressure regulating device fixed to a bottom inner surface of the cover so as to close the through hole and deformed in accordance with a pressure difference between a sealed liquid sealed in the cover and external water. The anti-load side bracket is formed with a protruding portion protruding on the anti-load side, and the pressure regulating device is configured as a bottomed pressure regulating cylinder having elasticity and having a flange at an open end, and A ring-shaped presser between the protruding end and the bottom inner surface of the cover It was disposed, Fuekikatachi underwater electric motor, characterized in that is pressed against the flange portion on the inner bottom surface in the pressing plate by fixing the cover to the protruding end. 3. A tubular frame surrounding and supporting the stator,
A pair of end plates disposed at both ends of the cylindrical frame, a rotor forming a pair with the stator, and a rotor disposed adjacent to and corresponding to each of the pair of end plates and via a bearing. A sealed-type underwater motor including a load-side bracket and a non-load-side bracket that rotatably supports a rotating shaft, and a bottomed cylindrical cover that surrounds the anti-load-side bracket to shut off the outside water. A protruding portion protruding to the non-load side is formed on the non-load side bracket, and the end plate on the non-load side of the cylindrical frame is disposed inside and fixed by a predetermined length from the non-load side end of the cylindrical frame. Then, a ring-shaped concave portion is formed on a surface of the outer periphery of the non-load-side bracket that is in contact with the end plate. Cylindrical frame A ring-shaped gap is formed between the inner periphery of the non-load end and the seal ring having the end plate as a bottom surface and an elastic space formed in the concave portion and the inner periphery of the non-load end. By attaching the bottom inner surface of the cover to the protruding end of the protruding portion and fixing the cover to the protruding end, the opening edge of the cover is inserted into the gap, and A sealed liquid type underwater motor, wherein the seal ring is pressed with a predetermined contact pressure to seal the inside and outside of the cover in a watertight manner. 4. A tubular frame surrounding and supporting the stator,
A pair of end plates disposed at both ends of the cylindrical frame, a rotor forming a pair with the stator, and a rotor disposed adjacent to and corresponding to each of the pair of end plates and via a bearing. A sealed-type underwater motor including a load-side bracket and a non-load-side bracket that rotatably supports a rotating shaft, and a bottomed cylindrical cover that surrounds the anti-load-side bracket to shut off the outside water. A protruding portion protruding toward the anti-load side is formed on the anti-load side bracket, and the bottom inner surface of the cover is brought into contact with the protruding end of the protruding portion to fix the cover to the protruding end. A liquid-sealed underwater motor characterized in that a leg or a leg member protruding toward the non-load side is provided on the bottom surface of the cover at or near the opposing surface of the motor. 5. The leg member is disposed in the vicinity of a tightening screw for screwing and fixing a bottomed cylindrical cover to a protruding end of the protruding portion of the non-load-side bracket from an outer surface of a bottom of the cover. The liquid-sealed underwater motor according to claim 4, further comprising a tip portion protruding further to a non-load side than a screw head of the attached screw. 6. The leg member according to claim 5, wherein the leg member is screwed and fixed to a protruding end of the protruding portion of the non-load side bracket via a bottomed cylindrical cover with a tightening screw. Sealed type underwater motor. 7. The liquid sealing type according to claim 1, wherein a projecting portion projecting from the non-load side end of the non-load side bracket is formed by a plurality of columnar projecting portions. Underwater motor.