JPS6026237Y2 - underwater equipment - Google Patents

Description

[Detailed explanation of the idea] [Industrial application field] The present invention relates to underwater equipment such as an underwater stirring pump.

[Conventional technology]

Conventionally, underwater equipment such as underwater stirring pumps has an impeller fixed to an output shaft that protrudes outside, and this impeller is covered with a casing and a feed pipe is connected to the casing.The drive source is built in the main body. It uses a hydraulic motor.

The output shaft bearing is located inside the main body and immersed in oil, and has a twin-shaft structure that provides lubrication and sealing from the outside.

This oil for lubrication and nail shaft becomes high temperature during operation due to heat generation from the bearing part due to high speed rotation of the output shaft.

Generally, the upper limit temperature at which lubrication does not occur due to the viscosity characteristics of lubricating oil is approximately 50°C, but this temperature may be exceeded during long-term operation.

Further, similar problems occur not only in the bearing portion but also in the hydraulic motor within the main body.

In order to prevent the lubricating ability from decreasing due to the rise in temperature of the lubricating oil, there is a method described in Japanese Utility Model Publication No. 51-31363 aimed at protecting the hydraulic motor.
This is a configuration in which oil is cooled by circulating oil between a chamber containing a hydraulic motor and a cooling container outside the main body.

[Problem that the invention attempts to solve]

However, in the equipment described in this publication and in conventional underwater equipment, the oil for lubricating the bearing and for the nail shaft remains in the chamber of the bearing, and heat generated from the bearing causes convection within the chamber, resulting in high temperatures. .

In addition, in order to obtain the pressure of the shaft seal, some models are equipped with a pressure regulating tank that communicates with the chamber, but even in this configuration,
Since the oil itself is not circulated, there is a problem in that it is not possible to prevent the temperature from rising and the lubricating ability from decreasing.

The purpose of this invention is to create an oil circulation system between the chamber and the pressure regulating mechanism in an underwater crosspiece in which the bearing part is immersed in the chamber for lubrication and the nail shaft, and the pressure regulating mechanism is connected. The purpose is to cool the oil and prevent a decline in lubrication ability.

[Means and effects for solving the problem 9] The present invention connects a hollow connecting casing below a motor chamber containing a built-in oil motor, and an impeller casing below this connecting casing to connect the output shaft of the oil motor. The impeller is fixed to the output shaft by penetrating the connecting casing and extending to the impeller casing, and sealing oil in the connecting casing, and connecting the bearing of the output shaft and the shaft seal part to the motor chamber and the impeller casing. In underwater equipment installed in each of The configuration is such that the outgoing pipe and the incoming pipe are connected in communication with each other at the upper and lower positions of the casing, and the sealed oil is circulated between the connecting casing and the elastic cylindrical body, and the pressure inside the connecting casing is adjusted by the contraction of the elastic cylindrical body. This is how it was done.

EXAMPLES Hereinafter, the present invention will be specifically explained based on examples shown in the drawings.

FIG. 1 is a cross-sectional view of an underwater stirring pump 1 shown as an example of underwater equipment. 2 is a motor chamber, 3 is an oil motor, and 5 is an output shaft with an impeller 4 fixed to the lower end. 1 oil chamber 6 is formed.

Reference numeral 7 designates an impeller casing connected to a pedestal 8 at its lower part, housing an impeller 4 therein, and connected to the oil motor 3 by a connecting casing 9. The impeller casing 7 is connected to a feed W19 for supplying fluid to the ground through a connecting elbow 18.

10 is a second oil chamber formed in the connection casing 9;
1 is a first oil chamber provided between the first oil chamber 6 and the second oil chamber 10.
A shaft seal 12 is a second shaft seal formed between the second oil chamber 10 and the impeller casing 7.

Furthermore, 13, 14 and 15 are the first
, second and third bearings, 16 a thrust bearing, 17 a stirring blade provided at the lower end of the output shaft 5, and 20 a power cable.

Reference numeral 23 denotes a cylindrical body disposed outside for oil cooling and pressure regulation, and as shown in FIG. The inside of this elastic cylindrical body 32 is connected to the upper and lower positions of the connecting casing 9 through an outgoing pipe 21 and a returning pipe 22.

24 is a drain provided at the lower end of the elastic cylindrical body 32.

In the structure of the cylindrical body 23 shown in FIG. 2, the drain 24 is connected to the outgoing pipe 22 by a pipe 34, and a plug 33 is screwed to the lower end.

In addition, the cover 30 has a large number of holes 31 on its entire wall surface, and when underwater, the water pressure is transferred to the elastic cylindrical body from these holes 31.
2, and performs a pressure regulating function to equalize the pressure inside the connection casing 9 with the outside world using oil as a medium.

In the above configuration, the impeller 4 and stirring blades 17 are rotated by driving the oil motor 3, and sand, sediment, etc. in the water can be supplied from the impeller casing 7 to the feed pipe 19 and transported to the ground.

Here, the connecting casing 9 communicates with an elastic cylinder 32 disposed on the external cylinder 23, so that when the device is installed underwater, the elastic cylinder 32 contracts due to water pressure through the hole 31. transform.

As the elastic cylinder 32 contracts and deforms, the oil sealed inside receives external pressure, and the oil pressure can be adjusted to be equal to the water pressure in the outside world.

Therefore, the second shaft sealing portion 12 on the impeller casing 7 side can be reliably sealed, and oil leakage and water intrusion can be prevented.

Also, due to the high speed rotation of the output shaft 5, the first and third bearings 13.
15 generates heat, and the oil in the connection casing 9 is heated and its temperature rises.

In this case, the internal oil is transferred between the connecting casing 9 and the elastic cylinder 32 by the outgoing pipe 21 and the returning pipe 22 communicating with the external elastic cylinder 32 at two positions above and below the connecting casing 9.
circulate between.

This is because the temperature difference between the oil inside the connection casing 9, which becomes high temperature due to the heat generated by the first and third bearings 13 and 15, and the oil inside the elastic cylinder 32, which is submerged in water and at a low temperature, acts as a circulating force. Therefore, the oil is transferred to the connecting casing 9 and the outgoing pipe 21.
．． Natural circulation occurs in the order of the elastic cylinder 32 and the return pipe 24.

Therefore, when the oil passes through the low-temperature elastic cylindrical body 32, it is cooled by exchanging heat with external water, so that even if the operation continues, the oil temperature can be prevented from increasing.

In this way, since the temperature rise of the oil can be regulated within a certain range, the viscosity of the oil can be maintained at an appropriate level, and smooth operation can be achieved without causing a decrease in the lubricating ability.

[Effect of idea]

This invention not only enables a reliable seal by regulating the oil pressure in the shaft seal with the outside pressure, but also cools the oil itself using the natural circulation of the oil, which prevents a drop in oil viscosity and also lubricates the bearing. This has the effect that it can be performed well.

[Brief explanation of drawings]

FIG. 1 is a longitudinal sectional view showing an example of underwater equipment according to the present invention;
FIG. 2 is an enlarged sectional view of the main part of the cylinder for pressure regulation and cooling. 1... Submersible stirring pump, 5... Output shaft, 6... First oil chamber, 7... Impeller casing, 9... Connection casing, 10・Song・2nd oil chamber, 11...1st shaft sealing part, 12...
... 2nd sealing part, 13... and 1st ■ bearing, 14.
...Second bearing, 15...Third bearing, 21
...Outward pipe, 22... Return pipe, 23.
・Curved cylindrical body, 30...Cover 31...Curved hole, 3
2...Bent elastic cylinder.

Claims (1)

[Scope of utility model registration request] A motor room containing an oil motor, a hollow connecting casing connected to the lower part of the motor room, an impeller casing fixed to the lower part of the connecting casing, and extending from the oil motor through the connecting casing to the impeller casing. It includes an output shaft and an impeller fixed to the output shaft within the impeller casing, and oil is sealed in the connection casing, and the bearing and shaft sealing portion of the output shaft are connected to the motor chamber and the impeller casing. In underwater equipment that has a configuration in which each part is installed in a continuous manner, a cylindrical body with many holes in the wall is placed outside the underwater equipment, and a bag-shaped elastic cylindrical body is enclosed within the cylindrical body. An underwater device characterized in that an elastic cylindrical body is communicatively connected to an outgoing pipe and a returning pipe which are connected to each other at upper and lower positions of the connecting casing.