JPS6322335Y2 - - Google Patents

Description

[Detailed Description of the Invention] The present invention relates to cooling and lubrication of the thrust bearing of a vertical rotating machine, particularly a vertical submersible motor used in a deep well.

Conventionally, vertical sealing type submersible pumps are used in deep wells.

The outline will be explained with reference to FIG. FIG. 1 is a longitudinal sectional view of the underwater motor. However, the figure is shown rotated 90 degrees, and the left side of the figure is the top. A stator 2 is fixed to a cylindrical sheet metal frame 1, and ring-shaped upper frame side plates 3 and lower frame side plates 4 are press-fitted and fixed on both sides. The three-core flat cable connector 6 penetrates a circular hole provided in the axial direction of the upper frame side plate 3 in a watertight manner using a sealing means, connects to a cable 7, receives three-phase AC power from the outside, and connects the stator coil 5. energize. A cylindrical stator can 8 made of sheet metal is placed in contact with the inner circumference of the stator 2.
Both sides of the frame are welded to the upper frame side plate 3 and the lower frame side plate 4. A motor shaft 10 to which a rotor 9, which is slightly separated from the stator 2 via the stator can 8 and is press-fitted with a gap from the stator can 8, slides into the upper radial metal 11 and the lower radial metal 12. ing. An upper bracket 14 is attached to the upper frame side plate 3 via a sealing ring 13.
The upper radial metal 11 is fitted into the upper bracket 14 via a detent pin (not shown). A sealing ring 16 is provided on the lower frame side plate 4.
The lower bracket 15 is inserted through the bolt 1.
7, and the lower radial metal 12 is fitted into the lower bracket 15 via a detent pin (not shown). A shaft sealing device such as an oil seal 18 is fitted into the upper bracket 14 at the upper part of the motor shaft 10 to seal the motor shaft 10. Following the oil seal 18, a cylindrical seal cover 19 with an L-shaped cross section is press-fitted into the upper bracket 14, and a sand slinger 20, which is press-fitted and fixed to the motor shaft 10, is attached to the cylindrical outer periphery of the seal cover 19. They touch each other at intervals and also act as drainers due to centrifugal force. 21 is the motor shaft 10
It is a balance ring that adjusts the dynamic balance and is press-fitted into the body. Upper end keyway 2 of motor shaft 10
A shaft joint (not shown) is press-fitted to 2, and rotational force is applied to a submersible pump (not shown) through the shaft joint, and thrust etc. from the submersible pump (not shown) is loaded onto the motor shaft 10. A plug 24 is screwed into an inlet 23 for filling liquid provided in the upper bracket 14.

A thrust disk 26 is fitted into the lower end of the motor shaft 10 through a key 25 so as to be rigid against rotation, and the thrust disk 26 comes into contact with the stage 10c of the motor shaft 10 so that thrust can be transmitted. A retaining ring 27 for the shaft is fitted into the circumferential groove 10 to prevent the thrust disk 26 from escaping from the motor shaft 10. A rotating disk 28 in the form of an annular flat plate is fitted into the thrust disk 26, and a detent pin 29 is press-fitted into the thrust disk 26 in the axial direction across the abutting end surface of the thrust disk 26 and the rotating disk 28. The pin 29 is loosely fitted into the rotating disk 28. A thrust carbon plate 30 having the same shape as the rotating disk 28 is fixed to the rotating disk 28.

Thrust housing 31 is attached to lower bracket 15
A bolt 17 is inserted into the lower end with a sealant applied thereto and inserted through a seal washer 32 to seal the bolt hole of the thrust housing 31. The bolt 17 is screwed into the lower frame side plate 4 and tightened together with the lower bracket 15, so that the thrust housing 31 is sealed and fixed. A collar 33 with a flange and a female thread cut on the inner diameter is fitted and fixed into a circular hole at the center of the bottom surface of the thrust housing 31. An adjusting screw 34 having a partially spherical tip is screwed into the collar 33, and a lock nut 35 is screwed into the adjusting screw 34. A leveling disk 36 is engaged with the tip of the adjusting screw 34 so as to be swingable.

Segmented thrust pads 37 are disposed on the circumference of the leveling disk 36 so as to be freely tiltable. The upper surface of the thrust pad 37 is adapted to slide on the thrust carbon plate 30. Thrust housing 3
1 is filled with lubricant. Such thrust bearing devices have been widely used in the past.

Thrust pad 37 and thrust carbon plate 30
slides and carries the thrust applied to the motor shaft 10.The sliding surface of the thrust pad 37 has a highly accurate flatness so that fluid lubrication is performed between the sliding surfaces of the thrust carbon plate 30 and the thrust pad 37. It is heat treated to achieve extremely high hardness.

By the way, the liquid film between the thrust pad 37 and the thrust carbon plate 30 is formed by the wedge-shaped liquid film pressure generated when the motor shaft 10 rotates, and the thrust force is supported through the fluid. There is.

A diaphragm chamber 46 is provided in the lower part of the thrust housing 31, through which the sealed liquid communicates through the hole 38 in the bottom surface of the thrust housing 31, and provides an expansion absorption device for the filled liquid. In the diaphragm chamber 46, a relatively thick hemispherical diaphragm 39 made of rubber (a diaphragm supported by a bellows or a conical coil spring, etc. can also be used) is mounted on a holding plate 40 having a hole 41 in the center that communicates with the outside. It is pressed and abutted against the thrust housing 31, and is fixed to the lowest part of the thrust housing 31 with bolts (not shown) in a watertight manner, and deforms when a differential pressure between the fluid pressure sealed in the motor and the external pressure is applied. Balance internal and external pressure.

In such a sealed liquid submersible motor, the bearing device is in the sealed liquid, and when energized, the motor shaft 10 rotates, and the thrust applied to the motor shaft 10 is transmitted to the thrust carbon plate 30. The sliding thrust pad 37 carries the load, but in conventional devices of this type, the circulation of the filled liquid inside and outside the leveling disk is poor, so heat tends to accumulate and the viscosity of the filled liquid decreases, reducing the load capacity of the thrust bearing. It had the disadvantage of being forced to do so.

The present invention eliminates the drawback that the sealed liquid in a submersible motor of a sealed liquid type submersible motor in a vertical rotating machine stagnates in a narrow chamber equipped with the thrust bearing device, degrading the bearing performance, and provides a thrust bearing device with excellent lubrication and cooling performance. The purpose is to provide.

The present invention extends the motor shaft into a cylindrical recess provided at the center of the leveling disk, cuts a thread at the end of the motor shaft, and uses the recess in the leveling disk as a pump chamber, thereby reducing the gap between the screws at the end of the motor shaft. A pump means is provided by fitting the pump into the pump chamber, and a suction hole is provided which penetrates from the bottom of the pump chamber of the leveling disk to the outside from below. As an embodiment, a hole is formed through the center of the leveling disk and the center of the adjusting screw.

Embodiments of the present invention will be described below with reference to the drawings.

FIG. 2 is a longitudinal sectional view of a thrust bearing section showing an embodiment of the present invention. 25 is a key, 26 is a thrust disk, 27 is a retaining ring for the shaft, and 28 is a rotating disk 30.
is a thrust carbon plate, 37 is a thrust pad,
39 is a diaphragm, and 40 is a holding plate, which are the same as in the conventional example. The motor shaft 10a pushes the motor shaft 10 in FIG. 1, and the leveling disk 36a is provided with a cylindrical recess 42.
Fit the motor shaft 10a with a small gap so as not to contact the side surface of the recess 42 of
The distal end surface of a is spaced from the bottom surface of the recess 42 of the leveling disk 36a to form a passage 43 for fluid passage. A screw 10b is provided at a portion of the leveling disk 36a of the motor shaft 10a facing the side surface of the recess 42. Leveling disk 3
6a is provided with a suction passage 44 that penetrates the bottom of the recess 42, and the adjusting screw 34a is provided with a suction passage 45 that coincides with the suction passage 44 in the axial direction. A liquid passage 38a is provided between the bearing chamber and the diaphragm chamber 46.

The upper part of the recess 42 has a sufficient depth, the inner periphery is extended to ensure pumping action between it and the screw 10b, and the inner periphery of the thrust pad 37 and the inner periphery of the thrust pad 37 are extended to appropriately restrict the flow path. An annular edging portion 42a having opposing outer peripheries is provided. This edging part 42a extends to the side of the thrust carbon plate 30, and if the gap between the edge part 42a and the thrust carbon plate 30 is made small, the discharge pressure of the screw pump between the screw 10b and the recess 42 can be increased, and the thrust carbon plate The sealed liquid can be pumped to the sliding surfaces of the thrust pad 30 and the thrust pad 37. This edging part 42a
The inner and outer circumferences have different functions, so the inner circumference is determined separately in consideration of the pump performance in relation to the screw 10b, and the outer circumference is determined in consideration of the cooling and lubricating performance of the thrust pad 37 and the thrust carbon plate 30. However, it is also possible to form a shape in which only either the inner or outer periphery of the edging portion 42a has an effect. The screw 10b has a large trough cross section in order to increase the amount of movement of the sealed liquid, but it may also have a triangular crest.

FIG. 3 is a plan view of the leveling disk 36a to which a part of the thrust pad 37 is attached, and FIG. 4 is a developed view along YY' of FIG.

The leveling disk 36a has a hole 36b, and the thrust pad 37 is inserted into this hole 36b with a small gap.
The legs 37b are fitted. This thrust pad 37 has a support 37a serving as a fulcrum, and the thrust force generated between the thrust carbon plate 30 and the thrust pad 37 is supported on the leveling disk 36a by the support 37a. FIG. 5 shows a cross section taken along line X-X' in FIG. 3, and the support 37a of the thrust pad 37 is located at the center of the thrust force that the thrust pad receives.
A radial rib 37c is provided on the back surface of the sliding surface member of the thrust pad 37.

When the screw 10b is a right-handed screw, when the motor shaft 10a rotates in the direction of the arrow c, a screw pump action occurs between it and the side surface of the concave portion of the leveling disk 36a.
As indicated by arrow a, the liquid in the diaphragm chamber 46 is sucked into the suction passage 45, suction passage 44, and passage 43,
The sealed liquid sent by the action of the screw 10b is discharged into the space on the inner peripheral side of the thrust carbon plate 30 and the thrust pad 37. When the filled liquid tries to flow out from the space in a radial manner from the center of FIG. It will pass through the department. At this time, the sealed liquid advances on the back side of the thrust pad 37 in contact with the back surface of the sliding member of the thrust pad 37, the support 37a, the foot 37b, etc., so the thrust pad 37 is well cooled, which helps to suppress the temperature of the sliding surface. A part of the sealed liquid lubricates the sliding surfaces of the thrust carbon plate 30 and the thrust pad 37, exits into the passage 31c between the thrust housing 31a and the thrust bearing device, and flows downward from the passage 38a at the bottom of the thrust housing 31a to the diaphragm chamber. It is forced to circulate until it reaches 46. Outside the submersible motor, water from a deep well is sucked into the submersible pump located above the submersible motor and flows in the direction of arrow b. The flow velocity in the narrow inner passage 31c of the thrust housing 31a is sufficient, the thermal conductivity of the inner surface of the thrust housing 31a is sufficiently improved, and the thrust pad 37 and the thrust carbon plate 3
The heat generated between the submersible motor and the submersible motor is forcibly cooled by the flowing sealed liquid, and the heat retained in the sealed liquid is dissipated through the thrust housing to the low-temperature water stream (arrow b) outside the submersible motor.

As mentioned above, this invention is a thrust bearing device in which a screw pump is constructed by extending the motor shaft, cutting a thread at the end, and inserting it into the cylindrical recess of the leveling disk. A suction passage hole is provided in the shaft center and the liquid in the diaphragm chamber is sucked in and discharged around the thrust bearing, which further reduces the heat generated by the thrust bearing due to the small mechanical loss of giving a flow velocity to the liquid on the inner surface of the thrust housing. By quickly dissipating from the inner surface of the thrust housing to the deep well water flow outside, the temperature rise in the thrust bearing is suppressed, thereby reducing the decrease in the viscosity of the lubricating fluid and maintaining the load capacity of the thrust bearing.

In the embodiment, a thrust bearing using a tailing pad as a thrust pad was used, but instead of using a tailing pad, the thrust bearing was an annular sliding member that was in contact with a thrust carbon plate and had oil grooves arranged radially on the sliding surface. The embodiment can also be applied to a thrust bearing whose receiving plate is held by a leveling disk, and it goes without saying that it is included in this invention (not shown). In the embodiment, the suction passage is provided with through holes in the adjusting screw 34a and the leveling disc 36a so as to communicate with the diaphragm chamber, and the liquid filled in the diaphragm chamber is also forced to circulate, so that the liquid filled in the thrust bearing can be cooled. Although a large amount is preferable, a through hole may be provided from the bottom of the recess 42 of the leveling disk 36a toward the lower surface or outer periphery of the leveling disk 36a to serve as a suction passage.

[Brief explanation of the drawing]

Fig. 1 is a vertical cross-sectional view of an underwater motor, Fig. 2 is a longitudinal cross-sectional view of a thrust bearing showing an embodiment of the present invention, and Fig. 3 is a vertical cross-sectional view of a thrust bearing showing an embodiment of the present invention.
The figure is a plan view of the leveling disk with a thrust pad partially attached, FIG. 4 is a developed view taken along the Y-Y' line in FIG. 3, and FIG. 5 is a sectional view taken along the X-X' line in FIG. 3. DESCRIPTION OF SYMBOLS 1... Frame, 2... Stator, 3... Upper frame side plate, 4... Lower frame side plate, 5... Stator coil, 6... Three-core flat cable connector, 7... Cable, 8... Stator can, 9... Rotor, 10 ...Motor shaft, 10a...Motor shaft, 10b...Screw, 10
c... Step, 11... Upper radial metal, 12... Lower radial metal, 13... Sealing ring, 14... Upper bracket, 15... Lower bracket, 16... Sealing ring,
17...Bolt, 18...Oil seal, 19...Seal cover, 20...Sand slinger, 21...Balance ring, 22...Keyway, 23...Inlet, 24
...Plug, 25...Key, 26...Thrust disk, 27...Retaining ring for shaft, 28...Rotating disk, 29...Pin, 30...Thrust carbon plate, 31, 31a...
Thrust housing, 31c...Passage, 32...Seal washer, 33...Collar, 34, 34a...Adjustment screw, 35...Lock nut, 36,
36a... Leveling disk, 36b... Hole, 37
... Thrust pad, 37a... Support, 37b... Leg,
37c...rib, 38...hole, 38a...passage, 39...
Diaphragm, 40...pressing plate, 41...hole, 42...
Recessed portion, 43... passage, 44, 45... suction passage, 46
...Diaphragm chamber, a, b, c...arrows.

Claims (1)

[Claims for Utility Model Registration] 1. A rotating disk is fixed to the end of a rotating shaft of a rotating machine, and the rotating disk is connected directly to the rotating disk or via a sliding member held on the rotating disk at least on the center line of the rotating shaft. In a thrust bearing device that is configured to slide with another sliding member that is swingably supported by a leveling disk that is supported by an adjustment screw arranged in the The shaft extends into the leveling disk, and has a cylindrical recess in the leveling disk, which has a tip with a male thread carved therein, and fits into the male screw with a small clearance, and the bottom surface of the recess of the leveling disk and the surface of the leveling disk. A thrust bearing device with a suction passage that communicates with the outside space. 2. Request for utility model registration in which the rotating machine is a submersible motor directly connected to a pump for deep wells, and a suction port is provided by providing holes in the centers of the adjustment screw and the leveling disk, which support the leveling disk in an adjustable manner. The thrust bearing device according to item 1.