JPH11252849A - Submerged motor - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a submerged motor which is hard for air to remain in a liquid reservoir part in the case of sealing a sealant, capable of holding good lubricating condition on a bearing part. SOLUTION: In this motor, a space part 8e as a liquid reservoir part having an almost spherical inner surface is formed in the periphery of a rotor shaft positioned in a load side from a boss part 8a which fit-mounts a sleeve bearing 9 in the internal periphery of a load side bracket 8A, also an air bleeding through-hole 8c inserted from the space part 8e to outside a load side end part in the load side bracket 8A is formed. In this way, a sealant 16 can be fully filled so as to prevent air from remaining in the space part 8, the possibility of dry operation of the sleeve bearing 9 is lessened, and good lubricating condition can be maintained.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a latent liquid type motor having a liquid sealed therein, and more particularly to an improvement in a load side case.

[0002]

2. Description of the Related Art FIG. 3 is a sectional view of a conventional latent liquid type motor. In the figure, 1 is a stator, 2 is a stator 1 on an inner peripheral surface.
, 3 and 4 are a pair of flanges which are welded to both ends of the frame 2 in a watertight manner, respectively.
Is a can fitted into the inside of the stator 1 and having both ends water-tightly welded to the flanges 3 and 4, respectively. Reference numeral 6 denotes a rotor that forms a pair with the stator 1, and reference numeral 7 denotes a rotor shaft that is fitted to and supports the rotor 6.

Reference numeral 8 denotes a load-side bracket made of cast iron screwed to the flange 3, which is a hollow boss portion 8a, a space portion 8b located above the boss portion 8a and having a rectangular cross section.
A through hole 8c and a hollow boss 8d are formed. 9
Is a cylindrical sleeve bearing made of a copper alloy of a low hardness material, which is fitted on the inner peripheral surface of the boss portion 8a and supports the load side of the rotor shaft 7, and is fitted on the boss portion 8d. Rotor shaft 7
This is an oil seal as a shaft sealing device for sealing the shaft.

[0004] An anti-load side bracket 11 is fixed to the inner diameter of the flange 4 by fitting, and 12 is fitted on the inner peripheral surface of the anti-load side bracket 11 to support the anti-load side of the rotor shaft 7.
This is a cylindrical sleeve bearing formed of a low-hardness copper alloy.

Reference numeral 13 denotes a thrust receiving case made of cast iron screwed to the flange 4, reference numeral 14 denotes a thrust bearing, and reference numeral 15 denotes a pressure regulating bellows as a pressure regulating device. Reference numeral 16 denotes a filling liquid obtained by mixing an antifreeze liquid with, for example, clear water. The thrust receiving case 13 has a thrust bearing chamber 13a containing a thrust bearing 14 and a hollow boss 13 formed below the thrust bearing chamber 13a and fitted with a pressure regulating bellows 15.
b, a through hole 13c for injecting the filled liquid 16 is formed, which communicates the boss 13c with the outer surface of the thrust receiving case 13.

The thrust bearing 14 includes a thrust disk 14a keyed to the rotor shaft 7, a thrust receiver 14b installed facing the thrust disk 14a via a water film, and a thrust receiver 14b. The thrust bearing 14c is fixed to the thrust support 14c, and the seat 14d supports the thrust support 14c in a tiltable manner. The seat 14d is supported by the thrust receiving case 13 in a tiltable manner. The pressure regulating bellows 15 is mounted on the inner peripheral surface of the boss 13a.

Reference numeral 17 denotes a case of a latent liquid type motor constituted by the frame 3, a pair of flanges 3, 5, the load side bracket 8 and the thrust receiving case 13, and a sealed liquid 16 is sealed in the case 17. . That is, the space on the rotor 6 side partitioned by the can 5 in the case 17, the space 8 b of the load side bracket 8, the thrust bearing chamber 13 a of the thrust receiving case 13, and the boss 13 b partitioned by the pressure regulating bellows 15 are formed. The sealing liquid 16 is sealed in these communicating spaces. 18 and 19 are plugs of the through holes 8c and 13c, respectively.

Reference numeral 20 denotes a power supply cable, reference numeral 21 denotes a connector for connecting the power supply cable 20 to the stator 2, reference numeral 22 denotes a filter for preventing foreign matter from entering the motor from outside, and reference numeral 23 denotes a rotor shaft 7. Sander color worn, 24
Is a bolt provided on the load side bracket 8 for connecting the case 17 to a pump case (not shown).

Prior to the operation of the latent liquid type motor, a filling liquid 16 is filled in a case 17. To fill the filling liquid 16, first, the case 17 is tilted so that the load-side bracket 8 is slightly higher than the thrust receiving case 13, and the case 17 is held so that the hole of the through hole 8c for air release faces upward. In a state where the through hole 8c is opened, that is, in a substantially horizontal state, a liquid (not shown) constituting the sealing liquid 16 is press-fitted from the through hole 13c provided in the thrust receiving case 13,
It is based on a method of replacing the liquid with the air in the case 17.
When the liquid (not shown) flowing out of the through hole 8c no longer contains air bubbles, it is determined that the replacement of the air in the case 17 with the filling liquid 16 has been completed, and the through holes 8c and 13c are respectively provided. Plug the plugs 18, 19 and close them.

The latent liquid type motor constructed as described above is driven by supplying electric power to the stator 2 from an external power supply (not shown) via a power supply cable 20 and a connector 21. When the internal temperature of the case 17 rises, the internal pressure of the can 5 rises and the pressure regulating bellows 15 is deformed. That is, in the space inside the can 5 where the filled liquid 16 should be filled, the gas remaining inside comes out, or hydrogen gas is generated due to corrosion of the constituent members, and the pressure regulating bellows 15 is deformed, and the liquid level of the sealed liquid 16 is lowered by the volume increased by the deformation.

If the sleeve bearing 9 is exposed in the air due to a decrease in the liquid level of the filled liquid 16, the sleeve bearing 9 is operated in a dry state, causing a failure such as seizure. Space 8 provided in bracket 8
By storing a spare filling liquid 16 larger than the deformation volume of the pressure regulating bellows 15 in b, the air exposure of the sleeve bearing 9 is prevented.

[0012]

Since the conventional latent liquid type motor is constructed as described above, when the case 17 is poured in a substantially horizontal state and the filling liquid 16 is filled, the space portion is not filled. The air in the upper part of the space in 8b may remain without being completely removed, and the amount of the sealing liquid 16 may be reduced accordingly. When the latent liquid type motor is operated in this state, the surroundings of the sleeve bearing 9 become turbid with the sealed liquid 16 and air, so that a good lubricating state cannot be maintained.
There is a problem that it causes a failure such as seizure of the sleeve bearing 9.

When the load-side bracket 8 is manufactured, molding is generally performed by casting. However, if the space 8b having the above-described shape is provided, for example, molding of molding sand or the like, which occurs during molding. It is difficult to remove debris (not shown) or cutting debris (not shown) generated by cutting after molding.
There is a possibility that the dust may remain in the space 8b, and these debris may enter the bearings such as the sleeve bearings 9 and 12 and the thrust bearing 14 during operation of the motor, thereby causing seizure of these bearings. And so on.

SUMMARY OF THE INVENTION The present invention has been made to solve the above-mentioned problems, and it is easy to remove debris in a case in a manufacturing process. An object of the present invention is to provide a latent liquid type motor that hardly remains and can maintain a good lubrication state of a bearing portion.

[0015]

According to a first aspect of the present invention, there is provided a latent liquid type motor, wherein a rotor shaft for supporting the rotor is filled with a rotor filled with a rotor that forms a pair with a stator. The load-side sleeve bearing supported on the inner periphery of the load-side bracket so as to rotatably support the bearing and the negative-side sleeve bearing supported on the inner periphery of the non-load-side bracket are configured to be lubricated. On the inner periphery of the bracket, on the load side relative to the load-side sleeve bearing, a liquid reservoir for storing the sealed liquid is provided, and the inner surface shape of the rotor shaft in the axial direction of the rotor shaft in the liquid reservoir is at least on the load side. It has an arc shape, and has a through hole for liquid filling or air vent at the time of liquid filling, penetrating from the arced portion to the load side end of the load side bracket.

The latent liquid type motor according to the second invention has a
In the latent liquid type motor according to the invention, the liquid reservoir is disposed over the entire outer periphery of the rotor shaft.

A latent liquid type motor according to a third aspect of the present invention has a first
In the latent liquid type motor according to the invention, the maximum inner diameter of the liquid reservoir is not more than twice the minimum inner diameter of the load side bracket.

[0018]

DESCRIPTION OF THE PREFERRED EMBODIMENTS Embodiment 1 Embodiment 1 of the present invention will be described with reference to FIG. FIG. 1 is a sectional view of a latent liquid type motor. 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.

In FIG. 1, 8A is a load side bracket,
Reference numeral 8e denotes a load-side, ie, above, boss portion 8a in which the sleeve bearing 9 is fitted inside the load-side bracket 8A, and the cross section of the rotary shaft 7 in the radial direction is centered on a coaxial center. And a space 8c as a liquid reservoir having a substantially spherical inner surface.
A is a through hole for venting air that penetrates outside the load-side end in A. The maximum inner diameter of the rotor shaft 7 in the axial direction in the inner surface shape of the space 8e is formed to be the minimum inner diameter, that is, about 1.7 times the inner diameter of the load-side bracket 8A through which the rotor shaft 7 passes. did.

The space on the rotor 6 side separated by the can 5 in the case 17, the space 8f of the load side bracket 8A, the thrust bearing chamber 13a of the thrust receiving case 13, and the pressure regulating bellows 15 are separated. Boss 13b
And the filled liquid 1 is filled in these communicating spaces.
6 is enclosed.

The latent liquid type motor constructed as described above is fixed from an external power supply (not shown) via a power supply cable 20 and a connector 21, similarly to the conventional latent liquid type motor shown in FIG. It is driven by supplying power to the child 2.

Prior to the operation of the latent liquid type motor, a filling liquid 16 is sealed in a case 17 of the latent liquid type motor as in the case of the conventional example shown in FIG. That is, since the space 8f of the load-side bracket 8A communicates with the boss 13b partitioned by the pressure regulating bellows 15, the case 17 is
The load side bracket 8A is provided on the thrust receiving case 13 in a state where the opening of the through hole 8c is held upward by tilting so as to be slightly higher than the thrust receiving case 13, that is, in a substantially horizontal state. From the through hole 13c, the sealed liquid 16
Is press-fitted, and the air in the case 17 is evacuated from the through hole 8c. Then, at the time when the air bubbles are no longer mixed with the liquid (not shown) flowing out from the through hole 8c, it is determined that the filling of the filling liquid 16 is completed, and the filling through hole 8c,
Plugs 18 and 19 are plugged into 13c, respectively.

The latent liquid type motor is generally elongated in the axial direction with respect to its outer diameter, and is unstable when it is in an upright state. This is carried out with the liquid type motor placed almost horizontally. Therefore, it has been conventionally difficult to seal the liquid so that air does not remain in the case 17. However, in the case of the first embodiment, the sealed liquid 16 is filled in the case 17, particularly in the space 8 e.
Can be sufficiently enclosed.

That is, since the inner surface of the space 8e is spherical, there are no corners, and air and air bubbles hardly remain in the space 8e in the operation of replacing the air inside the case 17 with the sealed liquid 16. . In addition, the space 8e has the rotor shaft 7
Is formed over the entire circumference, so that the volume as the liquid reservoir is relatively large. Therefore, the filling liquid 16 is sufficiently filled in the space 8e, and the pressure regulating bellows 15
Even if the liquid level of the sealed liquid 16 decreases due to the deformation, the surrounding of the sleeve bearing 9 fitted to the load side bracket 8A is unlikely to be in a state where the sealed liquid 16 and the air become turbid, and a good lubricating state is obtained. Can be kept for a long time.

Embodiment 2 Embodiment 2 of the present invention will be described with reference to FIG. FIG. 2 is a cross-sectional view showing a load-side bracket portion in the latent liquid type motor. Note that the latent liquid type motor of the second embodiment shown in FIG. 2 is the same as that of the first embodiment shown in FIG. 1 except for the load side bracket, and other drawings are omitted.

In FIG. 2, reference numeral 8B denotes a load-side bracket made of cast iron screwed to the flange 3, and reference numeral 8f denotes a space as a liquid reservoir provided in the load-side bracket 8B. The space portion 8f has an inner surface shape of a cross section of the rotary shaft 7 in a radial direction of the shaft which is circular around the coaxial center. The shape R1 has an arc shape, and is on the non-load side, that is,
Inner surface shape R2 on boss 8a side on which sleeve bearing 9 is fitted
Has a cylindrical shape, and the cylindrical end face is in contact with the side face with a relatively small radius of curvature. As in the case of the first embodiment shown in FIG. 1, the maximum inner diameter A in the axial direction of the rotor shaft 7 in the inner surface shape of the space 8f is the minimum inner diameter B, that is,
It was formed about 1.7 times the inner diameter of the load-side bracket 8A through which the rotor shaft 7 penetrated.

The inner surface shape of the space portion 8f is different from that of the latent liquid type motor of the first embodiment.
That is, since the inner surface shape R1 on the boss 8d side on which the oil seal 10 is fitted has an arc shape, it is difficult for air to accumulate in the liquid filling operation, and the space portion is formed in the same manner as in the first embodiment. 8f can be almost completely filled with the filling liquid 16, and the same effect as in the first embodiment can be obtained.

Further, in the latent liquid type motors of the first and second embodiments, the maximum inner diameter in the axial direction of the rotor shaft 7 in the inner surface shape of the spaces 8e and 8f is set to about 1.
Since it is formed seven times, it is easy to remove sand that adheres to the inner surfaces of the spaces 8e and 8f during the casting of the load-side brackets 8A and 8B, and cutting chips and the like during cutting. That is,
The recesses as viewed from the shaft holes in the inner surface shapes of the spaces 8e and 8f are relatively shallow, and foreign matters such as molding sand and cutting chips adhered to the inside of the spaces 8e and 8f can be easily blown by a method such as blowing air or sandblast. Can be removed.

In the latent liquid type motors of the first and second embodiments, the ratio between the maximum inner diameter and the minimum inner diameter in the spaces 8e and 8f is about 1.7 times. The ratio with respect to the inner diameter is not necessarily limited to about 1.7 times. If the ratio is not more than 2 times, similarly, when the load side brackets 8A and 8B are cast, the space 8
It is easy to remove sand or cutting debris during cutting, which adheres to the inner surfaces of e and 8f. Therefore, there is a possibility that the remaining debris may bite into the sleeve bearing 9 during operation of the latent liquid type motor. And high reliability can be obtained.

In the latent liquid type motors according to the first and second embodiments, the inner surfaces of the spaces 8e and 8f are circular with the center of the rotor shaft 7 as a center.
It is not necessary to form an axisymmetric circle, and a shape that is not axisymmetric, for example, even if the space is not formed on the entire circumference of the rotor shaft 7, satisfactory results can be obtained in practical use. Can be

However, the disturbance of the flow of the sealed liquid 16 in the spaces 8e and 8f caused by the rotation of the rotor shaft 7 due to the inherent viscosity of the sealed liquid 16 causes the inner surface shapes of the spaces 8e and 8f to change. In the case of a circular shape centering on the axis of the rotor shaft 7, the volume is relatively small, and the volume as the liquid reservoir becomes relatively large, and the periphery of the sleeve bearing 9 fitted to the load-side brackets 8A, 8B Is less likely to be in a state in which the sealed liquid 16 and air are turbid.

[0032]

According to the first aspect of the present invention, the liquid reservoir is formed around the rotor shaft on the load side of the load side bracket on the load side of the sleeve bearing, and at least the axial inner surface of the liquid reservoir on the load side. The shape is arc-shaped, and a through-hole for venting air at the time of liquid injection penetrating from the arc-shaped inner surface to the outside of the load-side end of the load-side bracket is provided. Even in a substantially horizontal position, there is an effect that a latent liquid type motor capable of sufficiently filling the filling liquid so that no air remains in the case is obtained.

According to the second aspect of the present invention, the liquid reservoir is formed over the entire circumference of the rotor shaft, so that the volume of the liquid reservoir can be effectively increased. Has the effect.

According to the third aspect of the present invention, the maximum inner diameter in the axial direction of the rotor shaft in the liquid reservoir is not more than twice the minimum inner diameter. There is an effect that a foreign substance is hardly collected in the liquid storage portion and is easily removed.

[Brief description of the drawings]

FIG. 1 is a sectional view showing a latent liquid type motor according to a first embodiment of the present invention.

FIG. 2 is a sectional view showing a load-side bracket in a latent liquid type motor according to a second embodiment of the present invention.

FIG. 3 is a sectional view showing a conventional latent liquid type motor.

[Explanation of Signs] 1 Stator, 2 frames, 3, 4 tsuba, 5 cans,
Reference Signs List 6 rotor, 7 rotor shaft, 8A, 8B load side bracket, 8c through hole, 8e, 8f space, 9 sleeve bearing, 10 oil seal, 11 anti-load side bracket, 12 sleeve bearing, 13 thrust receiving case, 1
3a space portion, 13b boss portion, 13c through hole, 14
Thrust bearing, 15 Pressure regulating bellows, 16 Filled liquid, 1
7 cases, 18, 19 stoppers

 ──────────────────────────────────────────────────続 き Continued on the front page (72) Inventor Tamito Nishiura 1-1-1 Imajuku Higashi, Nishi-ku, Fukuoka City, Fukuoka Prefecture Inside Fukuishi Semicon Engineering Co., Ltd.

Claims (3)

[Claims] 1. A sealing liquid filled so that a rotor paired with a stator is immersed therein and supported on the inner periphery of a load-side bracket so as to rotatably support a rotor shaft supporting the rotor. And configured to lubricate the load-side sleeve bearing and the anti-negative-side sleeve bearing supported on the inner circumference of the anti-load-side bracket, and at the inner circumference of the load-side bracket,
On the load side of the load side sleeve bearing, in a latent liquid type motor provided with a liquid reservoir for storing the sealed liquid, the inner surface shape of the rotor shaft in the liquid reservoir in the axial direction is at least at the load side. A latent liquid type motor having an arc shape and having a through hole for liquid filling or air vent at the time of liquid filling penetrating from the arced portion to the load side end of the load side bracket. 2. The latent liquid type motor according to claim 1, wherein the liquid reservoir is disposed over the entire outer periphery of the rotor shaft. 3. The liquid container according to claim 1, wherein the maximum inner diameter of the liquid reservoir is not more than twice the minimum inner diameter of the load side bracket.
The latent liquid type motor as described.