JPH058772Y2 - - Google Patents

Description

[Detailed Description of the Invention] (Industrial Application Field) The present invention relates to an improvement of a sealed liquid leakage prevention device for a submersible motor in which bearing lubricating liquid is sealed inside.

(Prior Art) As shown in FIG. 2, which is a front view of a submersible motor showing a main part in cross section, and FIG. 3, which is an enlarged view of the part shown in FIG. 1, on the load side of the rotating shaft 3, so that the sealed liquid that lubricates the radial bearing 4 and flows along the longitudinal direction of the rotating shaft 3 does not leak to the outside through the play gap between the gland 5 and the rotating shaft. , fixed to the cylindrical extension 7 provided on the ground holding plate 6 and the rotating shaft 3,
The leak prevention member 10 is made of an elastic material such as rubber and has an outer lip 8 and an inner lip 9 that elastically contact the outer and inner surfaces of the extension 7, respectively. When the submersible motor 1 is at rest, the outer lip 8 and the inner lip 9 prevent the liquid sealed inside the submersible motor 1 from leaking to the outside, and prevent sand, etc. from entering the submersible motor 1 from the outside. When the submersible motor 1 is in operation, the leakage prevention member 10 rotates together with the rotating shaft 3, and the inner lip 9 is pressed against the inner surface of the extension 7 of the gland holding plate 6 by the action of centrifugal force, and the leakage prevention member 10 rotates together with the rotating shaft 3. The inside of the motor 1 is isolated from the outside to prevent the sealed liquid inside the submersible motor 1 from leaking to the outside, and the submersible motor 1 is isolated from the outside.
It was designed to prevent sand, etc. from entering the interior.

(Problem to be Solved by the Invention) However, the rotating shaft 3 of the underwater motor 1 has a radial bearing 4 on the load side and a radial bearing 12 provided on the opposite side of the rotor 11 from the load side.
Between these radial bearings 4, 12 and the rotating shaft 3, there is a radial clearance necessary for the rotating shaft 3 to rotate while being lubricated by the sealed liquid. When the underwater motor 1 is transported by a truck, freight car, etc., the rotating shaft 3 may wobble in the radial direction due to the radial play between the radial bearings 4 and 12 due to shocks and vibrations received from the truck or freight car. Therefore, in the conventional sealed liquid leakage prevention device 2, the leakage prevention member 10 fixed to the rotating shaft 3 shakes in the radial direction with respect to the extension 7 of the gland holding plate 6, and the inside of the submersible motor 1. The filled liquid leaks from the radial play between the radial bearing 4 and the rotating shaft 3, the play between the gland 5 and the rotating shaft 3, and the inner and outer surfaces of the extension 7 of the gland holding plate 6. The liquid leaks to the outside through the gap created between the inner lip 9 and outer lip 8 of the prevention member 10, and the sealed liquid inside the submersible motor 1 decreases, causing lubrication of the radial bearings 4, 12 and the thrust bearing 13. There was a problem that the bearings became defective and the respective bearings were burnt out.

The present invention has been made to solve this problem.

(Means for Solving the Problems) As a means for solving the above problems, the present invention provides an outer lip that elastically contacts the outer surface and the inner surface of the cylindrical extension of the gland holding plate. An annular spring is attached to the outer surface of the leakage prevention member having an inner lip and an annular spring that presses the outer lip against the outer surface of the cylindrical extension of the gland retaining plate.

(Function) In this case, the outer lip of the leakage prevention member is constantly pressed against the outer surface of the cylindrical extension of the gland holding plate by the annular spring. Therefore, when the underwater motor is at rest, the inside of the underwater motor is completely isolated from the outside by the outer lip of the leakage prevention member.
It is possible to prevent sand and the like from entering the submersible motor from the outside, and to prevent the liquid sealed inside the submersible motor from leaking to the outside. Also, when transporting the underwater motor, the pressing force of the annular spring should be appropriately selected to prevent the leakage prevention member from rattling against the extension of the gland holding plate through the rotating shaft of the underwater motor as described above. For example, the inside of the submersible motor can be completely separated from the outside by the outer lip of the leakage prevention member, and the sealed liquid inside the submersible motor can be prevented from leaking to the outside. Furthermore, when the underwater motor is operating, the leakage prevention member fixed to the rotating shaft rotates together with the rotating shaft, and the outer lip attempts to open outward due to centrifugal force, reducing the pressing force of the annular spring, but the inner lip is pressed against the inner surface of the extension of the gland holding plate by the action of centrifugal force, cutting off the inside of the underwater motor from the outside, preventing sand, etc. from entering the inside of the underwater motor from the outside, and preventing sand from entering the inside of the underwater motor from the outside. It is possible to prevent the liquid sealed inside the motor from leaking to the outside. Therefore, when the submersible motor is stationary, transported, or operated, the liquid sealed inside the submersible motor does not leak to the outside and decrease, which prevents the radial and thrust bearings of the submersible motor from burning out due to poor lubrication. can be prevented.

(Embodiment) An embodiment of the sealed liquid leakage prevention device for an underwater motor of the present invention will be described below with reference to the drawings.

FIG. 1 is a front sectional view of an embodiment of the present invention. In FIGS. 1-3, the same reference numbers indicate the same parts.

In the figure, the sealed liquid leakage prevention device 21 of the underwater motor is a cylindrical extension 7 of the gland holding plate 6.
is fixed to the rotating shaft 3 of the underwater motor, has an outer lip 22 and an inner lip 23 in elastic contact with the outer and inner surfaces of the extension part 7, respectively, and is made of an elastic material such as rubber. Leakage prevention member 2
4, and an annular spring 25 attached to the outer surface of the leakage prevention member 24 to press the outer lip 22 against the outer surface of the extension portion 7.

Therefore, the outer lip 22 of the leakage prevention member 24 is constantly pressed against the outer surface of the extension 7 by the annular spring 25. Therefore, when the submersible motor is at rest, the inside of the submersible motor is completely isolated from the outside by the outer lip 22 of the leakage prevention member 24, which prevents sand etc. from entering the submersible motor from the outside and prevents the submersible motor from moving. The liquid sealed inside can be prevented from leaking to the outside. Furthermore, when transporting the underwater motor, the leakage prevention member 24 is connected to the ground holding plate 6 via the rotating shaft 3 of the underwater motor as described above.
Even if the annular spring 25 shakes against the extension part 7 of
If the pressing force of
The submersible motor is completely shut off, and the sealed liquid inside the submersible motor can be prevented from leaking to the outside.
Furthermore, when the underwater motor is operating, the leakage prevention member 24 fixed to the rotating shaft 3 rotates together with the rotating shaft 3, and the outer lip 22 attempts to open outward due to the action of centrifugal force, reducing the pressing force of the annular spring 25. However, the inner lip 23 is pressed against the inner surface of the extension part 7 by the action of centrifugal force, and isolates the inside of the underwater motor from the outside, preventing sand, etc. from entering the inside of the underwater motor from the outside. , it is possible to prevent the liquid sealed inside the submersible motor from leaking to the outside. Therefore, when the submersible motor is stationary, transported, or operated, the liquid sealed inside the submersible motor does not leak to the outside, so that the radial bearings 4, 12 and thrust bearing 13 of the submersible motor will burn out due to poor lubrication. can be prevented.

[Effects of the invention] As described above, the submersible motor leakage prevention device of the present invention has a cylindrical extension on the gland holding plate, and is elastically connected to the outer and inner surfaces of the extension. A leak prevention member made of an elastic material and having an outer lip and an inner lip that are in contact with each other is fixed to the rotating shaft of the underwater motor, an annular spring is attached to the outer surface of the leak prevention member, and the outer lip of the leak prevention member is fixed to the rotating shaft of the underwater motor. By constantly pressing the outer surface of the extension of the gland holding plate, the inside and outside of the submersible motor are completely isolated when the submersible motor is stationary and during transportation, and the inner lip of the leakage prevention member is closed when the submersible motor is in operation. By pressing against the inner surface of the extended part of the gland holding plate by the action of centrifugal force, it completely cuts off the inside and outside of the underwater motor and prevents sand, etc. from entering the inside of the underwater motor from the outside. At the same time, it is possible to prevent the liquid sealed inside the submersible motor from leaking to the outside. Therefore, when the submersible motor is stationary, transported, or operated, the liquid sealed inside the submersible motor does not leak to the outside and decrease, which prevents the radial and thrust bearings of the submersible motor from burning out due to poor lubrication. It has the effect of preventing

[Brief explanation of the drawing]

Fig. 1 is a front cross-sectional view of one embodiment of the present invention;
The figure is a front sectional view of a submersible motor equipped with a conventional sealed liquid leak prevention device, and FIG. 3 is an enlarged view of a portion of FIG. 2. 21... Enclosed liquid leakage prevention device, 22... Outer lip, 23... Inner lip, 24... Leakage prevention member, 25... Annular spring.

Claims (1)

[Scope of utility model registration request] a gland holding plate having a cylindrical extension, which is provided on the load side of a rotating shaft of an underwater motor, the inside of which is sealed with liquid for bearing lubrication; In a sealed liquid leakage prevention device comprising a leakage prevention member having an outer lip and an inner lip that come into elastic contact with the outer surface and inner surface of the extension portion, respectively, when the underwater motor is at rest, when being transported, etc., the rotating shaft is In order to prevent the sealed liquid from leaking to the outside even if the gland shakes in the radial direction, an annular spring is attached to the outer surface of the leak prevention member to press its outer lip against the outer surface of the cylindrical extension of the gland holding plate. A device for preventing leakage of sealed fluid in a submersible motor, characterized by: