JPS6111971Y2 - - Google Patents

Description

[Detailed description of the invention] The present invention is characterized in that the rotor conductor is made of aluminum or
This is a submersible canned motor that is made of aluminum alloy and whose rotor rotates in a liquid sealed inside the motor.The purpose of this motor is to prevent burnout of the motor part and seizure and damage of the bearings due to a decrease in the sealed liquid. It is something to do.

Figure 1 shows the configuration of the connection part between the motor part and the pump part in a conventional submersible canned motor.
At the end of the motor section 1, there are a motor section 1 and a pump section 2.
A motor bracket 3 for isolating the motor shaft 4 is fixed thereto, and shaft sealing mechanisms 5 and 6 for sealing the motor shaft 4 are attached to the motor bracket 3. The motor shaft 4 is connected to the pump shaft 7 via a coupling ring 8, and a sand flinger 9 for protecting the shaft sealing mechanisms 5 and 6 is provided in the middle thereof. The motor bracket 3 also has one end connected to the motor shaft 4.
A through hole 10 is formed, the other end of which communicates with the shaft through hole through which it passes, and the other end of which communicates with the outside, and a water inlet plug 11 is attached to the tip via a seal 12. Further, the connecting portion between the motor shaft 4 and the pump shaft 7 is surrounded by a pump flange 13.

In the above configuration, the gas accumulated inside the motor will be discharged to the outside when the pressure increases and exceeds the withstand pressure of the shaft sealing device, but as a result, the liquid sealed inside will gradually decrease. Become. When the motor is operated in such a state, the amount of liquid sealed in the rotor chamber is reduced, so there is a risk of damage to the bearings or an abnormally high temperature rise, which may cause the motor to burn out.

Therefore, the present invention prevents burnout of the motor section and seizure damage of the bearings by automatically replenishing the filled liquid that has decreased due to gas generation. An example will be explained with reference to FIG. Note that the same numbers as in FIG. 1 indicate the same functional parts. In FIG. 2, the pump flange 13 has a cylindrical structure with an open top, and the pump flange 13 has a cylindrical structure with an open top, and the liquid sealing tank part 1
4, and this sealing liquid tank portion 14 is filled with sealing liquid. Furthermore, a flinger 15 is provided on the upper part of the pump flange 13 to prevent foreign matter from entering from the outside. On the other hand, the motor bracket 3 is provided with a branched second through hole 16 that communicates the through hole 10 with the sealing liquid tank portion 14, and the through hole 10 is further equipped with a filter 17.

In the above configuration, the sealed liquid in the sealed liquid tank moves into the motor at the same time that the gas generated in the motor is discharged through the through hole 10, the filter 17, and the through hole 16, and the gas generated inside the motor is discharged. The structure is such that only the volume of gas is supplied. Therefore, the life of the motor will be significantly extended by the amount of sealing liquid present in the sealing liquid tank section 14, and the larger the volume of the sealing liquid tank section 14, the better.

Furthermore, since a filter 17 is installed at the entrance of the through hole 10 of the motor bracket 3, even if foreign matter from the outside passes through the flinger 15 and enters the inside of the pump flange 13, it will not enter the inside of the motor.
The structure is such that only water can enter, and it is possible to prevent damage to the motor bearing 18 due to foreign matter.

As is clear from the above description, the present invention provides the following effects.

Since the amount of sealed liquid can be increased, the life of the motor will be extended.

The generated gas passes through the through hole and accumulates in the sealed liquid tank inside the pump flange, so the inside of the motor is always filled with sealed liquid and has a good cooling effect.

[Brief explanation of the drawing]

Figure 1 is a cross-sectional view of a conventional underwater canned motor.
FIG. 2 is a sectional view of an underwater canned motor according to an embodiment of the present invention. DESCRIPTION OF SYMBOLS 1... Motor part, 2... Pump part, 3... Motor bracket, 4... Motor shaft, 7... Pump shaft, 8... Coupling, 10, 16... Through hole, 13... Pump flange, 14 ...Sealing liquid tank section, 17...Filter.

Claims (1)

[Scope of utility model registration request] In a submersible canned motor in which the rotor part rotates in liquid sealed inside the motor, a motor bracket that isolates the motor part and the pump part and supports the motor shaft via a bearing, and a connection between the motor shaft and the pump shaft. A pump flange surrounding the pump flange is provided between the motor bracket and the pump flange, and a sealed liquid tank portion for storing the sealed liquid is formed between the motor bracket and the pump flange. A through hole is formed, the other end of which communicates with the shaft through hole through which the motor shaft passes;
This underwater canned motor is equipped with a filter inside this through hole.