JPS5840761Y2 - Press-made dry submersible motor - Google Patents

Description

[Detailed explanation of the idea] The present invention relates to a press-made dry submersible motor.

Press-made dry submersible motors had to be tested for airtightness after they were manufactured, which caused several problems.

A conventional motor of this kind is shown in FIG. 1, in which a rotor 1 of the motor is attached to a motor shaft 2, and a bearing 3 containing grease that rotatably supports the motor shaft 2 is supported by a bearing support plate 4. .

The bearing support plate 4 and the outer periphery of the mechanical seal holder 5 in contact with its lower surface are fixed between the lower end of the motor frame 6 and the upper end of the stuffing box 7. An airtight chamber A on the motor side is defined within the frame 6, and an airtight chamber B is defined within the stuffing box T.

A stator 10 is fixed to the motor frame 6.

When performing an airtight test of the underwater motor as described above, air is sent from airtight chamber B to airtight chamber A, but at this time, the grease on the bearing 3 is blown out to the chamber A side.

Therefore, a groove 11 is provided in the motor shaft 2, and the test air passes through the groove 11.

However, since it is impossible to machine this groove 11 using a lathe, setup changes are required, which increases manufacturing costs.

Further, the thrust in the axial direction acts on the mechanical seal holder 5 and the mechanical seal plate 9, and in order to apply this thrust to the bearing support plate 4, spot welding is performed.

However, since it is impossible to reduce the overhang 13 to zero due to operational reasons, the mechanical seal plate 9
The thickness of the plate must be increased, which increases costs, and the rate of increase increases especially when the parts in contact with liquid are made of stainless steel.

The present invention has been made in view of the above points, and provides a press-made dry submersible motor that increases the strength of the mechanical seal holder and improves the flow of test air.

An embodiment of the present invention will be described below with reference to FIG.

In this figure, the same parts or members as in FIG. 1 are given the same reference numerals.

Thus, the rotor 1 of the motor is added to the motor shaft 2,
A bearing 3 containing grease that rotatably supports the motor shaft 2 is supported by a bearing support plate 4.

The bearing support plate 4 and the outer periphery of the mechanical seal holder 5 in contact with its lower surface are fixed between the lower end of the motor frame 6 and the upper end of the smuffing box 7. An airtight chamber A on the motor side is defined within the frame 6, and an airtight chamber B is defined within the stuffing box.

The upper part of a mechanical seal (not shown) is supported by the inner flange 8 and mechanical seal plate 9 of the mechanical seal holder 5, and the stator 10 of the motor is attached to the motor frame 6.

The support plate 4 and the holder 5 are spot welded 12, and an impeller of a submersible pump (not shown) is fixed to the lower end of the motor shaft 2.

In the present invention, the mechanical seal holder 5 is provided with at least one rib 15 extending in the radial direction, and a groove 16 is formed on the back side of the rib 15.

The bearing support plate 4 is provided with a ventilation hole 17 that matches the groove 16, and the mechanical seal plate 9 is also provided with a ventilation hole 18.
is provided.

With the above configuration, when air is sent from airtight chamber B to airtight chamber A in order to perform an airtight test, the air flows through the ventilation holes 18 of the mechanical seal plate 9 and the grooves 15 of the ribs 15.
and enters the airtight chamber A through the ventilation hole 17 of the bearing support plate 4.

Therefore, the grease in the bearing 3 is not blown out to the motor side.

As explained above, in the present invention, the mechanical seal holder is provided with ribs extending in the radial direction, and the bearing support plate is provided with ventilation holes that match the grooves of the ribs.
The test air can be sent through the grooves and vent holes, and the airtightness test can be carried out smoothly without any stress, and can be increased by the strong ribs of the mechanical seal holder.

[Brief explanation of drawings]

FIG. 1 and FIG. 2 are diagrams showing an example of a conventional press-made dry submersible motor and a press-made dry submersible motor according to the present invention, respectively. 2...Motor shaft, 3...Bearing, 4
... Bearing support plate, 5 ... Mechanical seal holder, 15 ... Rib, 16 ...
...Groove, 17...Vent hole.

Claims (1)

[Scope of utility model registration request] a bearing support plate that supports the bearing of the motor shaft;
In a press-made dry submersible motor that has a mechanical seal plate that supports the upper part of the mechanical seal and a mechanical seal holder that contacts the lower surface of both of the plates, and that defines an airtight chamber on the motor side, the mechanical seal holder A rib is provided that protrudes on the side opposite to the motor and extends in the radial direction, and a ventilation hole is provided in the bearing support plate provided on the motor side of the mechanical seal holder at a position that matches the groove on the back surface of the rib. A press-made dry submersible motor characterized in that a mechanical seal plate is provided with a vent hole at a position radially inward corresponding to the groove on the back surface.