JPH0232864B2 - - Google Patents

Description

[Detailed description of the invention] [Object of the invention] "Industrial application field" The present invention is directed to sea water, brine water, etc.
This replaces a submersible canned motor that drives a submersible pump that pumps water containing corrosive components such as.

"Prior Art" FIG. 3 is a longitudinal sectional view of a conventional canned motor. However, the figure is shown rotated 90 degrees, and the right side of the figure is the top. Sheet metal cylindrical frame body 1
A stator 2 is fixed inside, and a ring-shaped upper frame side plate 3 and a lower frame side plate 4 are press-fitted on both sides, and the end face of the frame body 1 and the upper and lower frame side plates 3,
The four spaces are each welded and fixed to form a frame. An upper bracket 5 is attached to the upper frame side plate 3.
is inserted and fixed. An upper radial metal 7 is fitted into the upper bracket 5. A lower bracket 9 is fitted and fixed into the lower frame side plate 4, and a lower radial metal 12 is fitted into the lower bracket 9. A stator 2 and a stator can 13 are attached to the upper radial metal 7 and the lower radial metal 12.
A motor shaft 15 to which a rotor 14, which is disposed slightly apart from the stator can 13, is press-fitted and fixed, is slid into the motor shaft 15 via the stator can 13.

A thrust housing 23 is attached to the lower bracket 9.
A self-aligning thrust bearing 16 is provided in the thrust housing 23 to receive the thrust of the motor shaft 15, and a diaphragm 34 is attached below the bearing 16 to seal the lower end of the thrust housing 23.

The upper bracket 5 is fixed to the upper frame side plate 3, and a shaft sealing device is provided at the portion through which the motor shaft 15 passes through and exits to the outside. The outer diameters of the motor frame body 1, upper and lower frame side plates 3, 4, upper bracket 5, and thrust housing 23 are made to be the same diameter.

An example of such a submersible canned motor is the submersible motor disclosed in Japanese Patent Application No. 57-232031.

"Problems to be Solved by the Invention" In such an underwater canned motor, the end of the frame body 1 and the upper and lower frame side plates 3 and 4 are fixed by welding. Welding creates sensitized areas in and around the weld zone due to the thermal effects of welding. This sensitized area remains as is and no metallurgical treatment is performed.

This is because the structure of the underwater canned motor includes electrical insulators such as stator coils, so heat treatment such as solid solution treatment cannot be performed on the weld sensitized portion. For this reason, when using a submersible canned motor, corrosion progresses more rapidly near the welds between the frame body 1 and the upper and lower frame side plates 3 and 4 than other parts, and the lifespan of the submersible canned motor may be determined by this area. .

An object of the present invention is to provide a submersible canned motor in which the welded portion between the frame body and the upper and lower frame side plates is free from corrosion, thereby ensuring a long life of the submersible canned motor.

[Structure of the invention]

``Means for Solving the Problems'' This invention consists of welding both ends of a frame body fitted into the outer diameter sides of upper and lower frame side plates to the frame side plates to form a frame, and inserting and welding them into the inner diameter sides of the upper and lower frame side plates. In an underwater motor with a stator chamber sealed by a stator can, a member is provided to cover the welded portion of the frame body and the frame side plate, and a sealing means to prevent external liquid from entering the welded portion is provided between the frame, the frame body and the frame side plate. This is an underwater motor installed between members covering the welded part.

``Operation'' The sealing means between the frame and the member covering the weld between the frame body and frame side plate prevents external liquid from entering the weld between the frame body and frame side plate.

"Embodiments" Examples of the present invention will be described below with reference to the drawings.
FIG. 1 is a longitudinal sectional view. However, the figure is shown rotated 90 degrees, and the right side of the figure is the top. A stator 2 is fixed in a cylindrical frame body 1 made of sheet metal, and a ring-shaped upper frame side plate 3 and a lower frame side plate 4 are press-fitted on both sides. They are each fixed by welding and are finished in a cylindrical shape with a good surface on both sides of the welded parts. An upper bracket 5 is fitted into the upper frame side plate 3 and fixed with bolts 6. An upper radial metal 7 is fitted into the upper bracket 5 via a rotation stopper pin (not shown). A lower bracket 9 is fitted into the lower frame side plate 4 and fixed with bolts 11, and a lower radial metal 12 is attached to the lower bracket 9 via a detent pin (not shown).
is inserted. A motor shaft 15 is slid into the upper radial metal 7 and the lower radial metal 12 via the stator 2 and the stator can 13, and the rotor 14, which is disposed slightly apart from the stator can 13, is press-fitted therein. ing.

The lower end of the motor shaft 15 is fixed by fitting a rotary disk 17 at the upper end of a self-aligning thrust bearing 16 via a key 18. Self-aligning thrust bearing 16
A thrust pad 22 is supported via the thrust arm 21 in contact with a thrust arm 21 having a linear fulcrum in the tangential direction on the circumference of the leveling disk 19, and a thrust collar in which the leveling disk 19 is fitted and fixed in a thrust housing 23. Adjustment screw 25 screwed into 24
It is swingably supported by being swingably supported on the hemispherical surface of the upper end, is attached to the leveling disk 19 so as not to move, and is arranged on the circumference of the end surface of the leveling disk 19. An annular thrust carbon plate 28 that is fitted into the anti-load side thrust pad 22 and the rotary disk 17 while being prevented from rotating by a pin 27 slides, and the thrust generated by the operation of a pump connected to a submersible motor and as shown in the figure The weight of the shaft joint at the end of the motor shaft 15, the rotor 14, the motor shaft 15, etc. that is not connected to the motor shaft 15 is supported as a load. Asiast Screw 25
The position of the motor shaft 15 is adjusted and fixed to the thrust housing 23 with a lock nut 29. 2
Reference numeral 6 designates a thrust bearing that is held so as not to rotate by a lower bracket 9 that carries a load in the direction in which the motor shaft 15 is pulled out. Thrust housing 23
is fitted into the counter-load side side cover 31 via a sealant, and is fixed to the lower bracket 9 by screwing bolts 32 through the bolt holes in the axial direction of the thrust housing 23 through seal washers.

A diaphragm chamber 33 is fitted into the lower part of the thrust housing 23 via a packing, and the bolt 30 is inserted into the lower part of the thrust housing 23.
Fixed by A diaphragm 34 is fitted into the diaphragm chamber 33, and the diaphragm 34 is inserted into the diaphragm chamber 33 so as to press the outer flange portion of the diaphragm 34.
A holding plate 36 with a hole 35 made in the vicinity of the lower end of the holding plate 3 is in contact with the holding plate 36, and a bolt 37 is inserted into the holding plate 36 and the bolt hole of the diaphragm 34, and is screwed into the diaphragm chamber 33 and tightened together to ensure watertightness. A diaphragm protection plate 38 screwed and fixed to the adjusting screw 25 is for preventing excessive and abnormal deformation of the diaphragm 34.

When the lower bracket 9 is fitted into the lower frame side plate 4, the approximately cylindrical anti-load side side cover 31 prevents the anti-load from occurring between the circumferential protrusion 4a on the outer periphery of the lower frame side plate 4 and the flange end face of the lower bracket 9. Circumferential protrusion 3 on the inner periphery of the side side cover 31
It is fixed by holding 1a.

The anti-load side side cover 31 has a circumferential groove for a sealing ring on the inner periphery of the side that fits into the frame body 1, and a sealing ring 3 that fits into the circumferential groove on the outer periphery of the frame body 1.
9, and a sealing ring 39 seals between the frame body 1 and the opposite side cover 31. The sealing ring 39 is located on the load side beyond the weld heat affected zone caused by welding the lower frame side plate 4 and the end of the frame body 1, and is located at a position where the sensitized area due to welding is completely isolated from external liquid. .

The coil 41 of the stator 2 is connected to a three-core flat cable connector 42, and the three-core flat cable connector 42 is connected to the upper frame side plate 3 and the upper bracket 5.
A circular hole provided in the axial direction is made watertight by a sealing means, passes through the hole, connects to a flat cable 43, and receives three-phase alternating current power from the outside.
Both sides of the cylindrical stator can 13 made of sheet metal are in contact with the inner circumference of the stator 2, and upper frame side plates 3,
It is welded to the lower frame side plate 4.

When the upper bracket 5 is fitted into the upper frame side plate 3, the approximately cylindrical load side side cover 44 is inserted between the circumferential protrusion 3a on the outer periphery of the upper frame side plate 3 and the flange end face of the upper bracket 5 on the load side. Circumferential protrusions 44 on the inner periphery of the cover 44
It is fixed by holding a.

The load-side side cover 44 has a circumferential groove for a sealing ring on the inner periphery of the side that fits into the frame body 1, and a sealing ring 4 that fits into the circumferential groove on the outer periphery of the frame body 1.
5, and a sealing ring 45 seals between the frame body 1 and the load-side side cover 44. The sealing ring 45 is located on the opposite load side beyond the weld heat affected zone caused by welding the upper frame side plate 3 and the end of the frame body 1, and is located at a position where the sensitized part due to welding is completely isolated from external liquid. be.

An upper cover 47 is fitted into the cylindrical upper casing 46 which is fitted into the load side side cover 44,
A pump connecting bolt 48 that is inserted through a bolt hole in the upper cover 47 through a packing is attached to the upper bracket 5.
By being screwed into the upper casing 4
6. The upper cover 47 is fixed by pressing the load side side cover 44.

The flat cable 43 is inserted through a rubber bushing 52 which is fitted into a cylindrical step hole in the axial direction of the upper cover 47 and is pressed via a washer 51 by a cable nut 49 screwed into the step hole. The watertightness of the part where the flat cable 43 is inserted is ensured by this.

A seal case 54 is fitted into the center hole of the upper cover 47 via a seal ring 53 and fixed with bolts 55.

An oil seal 56 for sealing the motor shaft 15 is press-fitted into the seal case 54.
A hard, corrosion-resistant seal cover 57 is press-fitted onto the outer periphery of the cylindrical end of the part where the sand slinger 6 is fitted, and the lip on the inner circumference of the sand slinger 58 press-fitted onto the motor shaft 15 approaches the seal cover 57. There is. Reference numeral 59 denotes a mechanical seal which is a sealing means on the inside side of the oil seal 56, 61 is a fixed sliding ring that is hermetically fitted into the seal case 54, and 62 is a mechanical seal that is loosely fitted into the motor shaft 15 and is slidable on the fixed sliding ring 61. A rotating sliding ring 63 is fixed to the rotating sliding ring 62 and elastically tightened to the motor shaft 15 so that it can move in the axial direction, and 64 is a motor shaft. 15 is a spring seat 64 which is stopped from moving in the axial direction by a shaft retaining ring 65 which is fitted into a circumferential groove, and which is fitted into the motor shaft 15;
A compression spring is inserted between the movable ring 63 and the rotary sliding ring 62 and presses the rotating sliding ring 62 against the fixed sliding ring 61.

In such a submersible motor, a liquid is sealed inside except for the stator chamber where the stator 2 is located. It is designed to be able to be injected and drained using the same method.

The thrust housing 23, the anti-load side side cover 31, the load side side cover 44, the upper casing 46, and the upper cover 47 have the same maximum diameter, which is the maximum diameter of the underwater motor, and have predetermined dimensions corresponding to the well diameter. .

Such a submersible motor is constructed such that all components are within the axial extension plane of the cylinder with the maximum diameter, and includes a pump connecting bolt 48 having a threaded portion extending upward from the hexagonal head to which the tool fits. According to
A generally cylindrical submersible pump is similarly connected via the relay casing, and the pump shaft is connected to the end of the motor shaft 15 by a shaft coupling (not shown).

Here, to give an example of the filled liquid, the stator chamber leaves some air, the stator chamber filled liquid is insulating oil, and the rotor chamber filled liquid other than the stator chamber is a propylene glycol aqueous solution or silicone oil. .

When power is supplied from the ground through the cable 43, the stator coil 41 is energized via the connector 42,
The rotor 14 receives rotational force, causing the motor shaft 15 to rotate, and a submersible pump (not shown) is rotated via a shaft coupling to pump water from the well. The motor shaft 15 carries a radial load by the upper and lower radial metals 7 and 12, and the thrust bearing 16 supports the pump thrust and the weight of the object carried by the motor shaft 15. The part where the motor shaft 15 exits to the outside is between the sand slinger 58 and the seal cover 57 to prevent the intrusion of fine solids such as sand, and the well water is sealed by the motor shaft 15 and the oil seal 56.
The shaft is sealed by a mechanical seal 59.

Now, when a submersible motor pump using the submersible motor of the present invention is installed in seawater or salt water, there will be a temperature difference with the liquid being handled and the motor heats up, causing the sealed liquid in the stator chamber to
Generally, the sealed liquid in the rotor chamber, the sealed liquid in the shaft sealed chamber, and the filled liquid in communication with the filled liquid expansion and absorption chamber are heated. At this time, the expansion of the liquid sealed in the stator chamber partially compresses the sealed air to suppress the generated pressure. In the rotor chamber, the filled liquid, the air remaining in the rotor chamber, the gas contained in the filled liquid, and the gas generated by the reaction between the filled liquid and the metal inside are heated and expanded. The diaphragm 34 is then deformed outward against the elasticity of the diaphragm. External pressure and diaphragm 3
The sum of the elasticities of 4 and the pressure of the liquid sealed in the rotor chamber are balanced.

The liquid-contact surfaces of such underwater motors are easily corroded by salt-containing liquids, and the outer peripheries of the frame side plates 3 and 4 are particularly susceptible to corrosion at both ends and upper and lower parts of the frame body 1, which cannot be metallurgically treated as a solid solution. However, the part that has become sensitive due to such welding is sealing ring 3.
9 and 45, it is shielded from external liquid, so it will not corrode.

In this embodiment, the anti-load side and load side side covers are extended to the center of the frame beyond the welded portion between the frame body end and the upper and lower frame side plates, and a sealing ring is provided in which the base metal portion affected by welding is provided in the side cover. 3
9 and 45 seal the external liquid, but it is preferable to interpose a liquid gasket in the portion sealed by the sealing rings 39 and 45 and on the outside thereof.

Another embodiment includes sealing rings 39, 45 and anti-load side and load side side covers 3 that hold them.
By eliminating the circumferential grooves 1 and 44, both side covers 3
A liquid gasket may be applied to both of the inner circumferences of the frames 1 and 44 and the frame body 1 so that there is a liquid gasket between them.

In the embodiment, the thrust housing 23 and the upper casing 46 are fixed to both side covers 31 and 44, respectively, but as shown in FIG. 2, the frame and upper and lower parts of the underwater motor shown in FIG. A ring-shaped member 69 may be interposed at the welded part A of the bracket with a sealing material (sealing ring 39, 45, liquid gasket, or both) to isolate and cover the welded part from external liquid. It may also be made of rubber and fitted over the frame and the upper and lower brackets with a liquid gasket so as to be tightened with a ring-shaped member 69.

〔Effect of the invention〕

This invention provides an underwater motor having a structure in which a stator chamber is sealed by welding between a frame body, a frame side plate, and a can, and a member is provided to cover the welded portion between the frame body end and the frame side plate. (1) Sensitization due to heat during welding Since the parts can be isolated from corrosive liquids, the parts do not rapidly corrode, making it possible for canned motors to be used in fields where seawater, brine, etc. are used as handling liquids.

(2) Since a canned motor can be used, the cost is lower than using a water-resistant insulated submersible motor.

(3) In the first embodiment, the cable connector is located in a shaft-sealed chamber that is not immersed in external liquid, so that the connector does not corrode.

[Brief explanation of drawings]

FIG. 1 is a longitudinal sectional view of an embodiment of the present invention, FIG. 2 is a longitudinal sectional view of another embodiment, and FIG. 3 is a longitudinal sectional view of a conventional example. DESCRIPTION OF SYMBOLS 1...Frame, 2...Stator, 3...Upper frame side plate, 3a...Protrusion, 4...Lower frame side plate, 4a...Protrusion, 5...Upper bracket, 6
...Bolt, 7...Upper radial metal, 9...
Lower bracket, 11... Bolt, 12... Lower radial metal, 13... Stator can, 14
... Rotor, 15 ... Motor shaft, 16 ... Self-aligning thrust bearing, 17 ... Rotating disk, 18 ...
Key, 19... Leveling disk, 21... Thrust arm, 22... Thrust pad, 23...
...Thrust housing, 24...Thrust collar, 25...Adjustment screw, 26...Thrust bearing, 27...Pin, 28...Thrust carbon plate, 29...Rockite, 30...Bolt, 31...Reverse Load side side cover, 31a...
Projection, 32... Bolt, 33... Diaphragm chamber, 34... Diaphragm, 35... Hole, 36...
... Holding plate, 37 ... Bolt, 38 ... Diaphragm protection plate, 39 ... Sealing ring, 41 ... Stator coil, 42 ... Three-core flat cable connector, 43 ...
...Flat cable, 44...Load side side cover,
44a... Projection, 45... Sealing ring, 46... Upper casing, 47... Upper cover, 48... Pump connection bolt, 49... Cable nut, 51...
...Washer, 52...Rubber button, 53...Sealing ring, 54...Seal case, 55...Bolt, 5
6...Oil seal, 57...Seal cover, 5
8... Sandslinger, 59... Mechanical seal, 61... Fixed sliding ring, 62... Rotating sliding ring, 63... Moving ring, 64... Spring seat, 65...
Shaft retaining ring, 66... Compression spring, 67, 68...
Plug, 69...ring-shaped member.

Claims (1)

[Claims] 1. An underwater chamber in which both ends of the frame body fitted into the outer diameter side of the upper and lower frame side plates are welded to the frame side plates to form a frame, and a stator chamber is sealed by a stator cann which is fitted and welded to the inner diameter side of the upper and lower frame side plates. An underwater motor in which a member is provided to cover a welded portion between a frame body and a frame side plate, and a sealing means to prevent external liquid from entering the welded portion is provided between the frame and the member covering the welded portion between the frame body and the frame side plate.