JPS6119836B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to a fluid transfer pump that has a high discharge pressure and can be used at any water depth.

[Conventional technology and its problems]

Conventionally, when transferring fluids such as water over high head or long distances, transfer pumps with high discharge pressure are used, but due to the high discharge force, the shaft seal inevitably experiences strong back pressure. As a result, the sealing effect of the shaft seal portion was incomplete and damage was caused.

On the other hand, when such a pump is used in a deep water location, the shaft sealing part should be
The shaft was subjected to an extreme pressure difference, which also made the sealing effect at the shaft seal incomplete and caused damage.

[Problem that the invention seeks to solve]

An object of the present invention is to provide a fluid transfer pump that can solve the above problems.

[Means for solving problems]

In order to solve the above problems, in the present invention, in a fluid transfer pump in which a motor chamber is formed inside which is separated by a partition wall having a rotating shaft sealing part, a hydrostatic pressure regulator and a discharge pressure regulator are respectively installed in the pump body. Mounted externally. The hydrostatic pressure regulator consists of a pressure regulating tank into which water flows into the area where the pump is used, and a water-sealing variable volume body disposed within the regulating pressure tank and varying the internal volume depending on the water pressure of the inflowing water, In addition, the discharge pressure regulator is a pressure regulating tank into which water discharged from the discharge port of the pump body flows, and a water-sealing variable volume body that is disposed within the equal pressure tank and whose internal volume is varied depending on the water pressure of the inflowing water. It is composed of. Further, each of the water-sealing variable volume bodies is communicated with the shaft sealing portion via an on-off valve for selecting discharge pressure and hydrostatic pressure, and a connecting pipe.

〔Example〕

DESCRIPTION OF THE PREFERRED EMBODIMENTS The present invention will be specifically described below based on embodiments shown in the accompanying drawings.

This embodiment is used by installing it on the seabed, as shown in Fig. 1. In the figure, 1 indicates the pump body;
2a is attached to the pump body 1;
2b is a pressure regulator that transmits the hydrostatic pressure at the location where the pump body 1 is installed to the inside of the pump body 1.

The pump body 1 can have various forms, but to explain the pump structure in this embodiment, in the figure, 3 is an oil-immersed electric motor (oil-sealed electric motor) surrounded by a frame 4, and 5 is an oil-immersed electric motor. 3
A first oil chamber 6 is formed within the impeller 8 fixed to the tip of the output shaft 7 of the oil-immersed electric motor 3.
1 is an impeller casing that surrounds the impeller 6 and further has a fluid suction port 9 in the axial direction and a fluid discharge port 10 in the radial upper portion, 11 is a connection casing that connects the oil-immersed electric motor 3 and the impeller casing 8, and 12 is the connection. The second oil chambers 13 and 14 formed in the casing 11 are the first oil chambers 13 and 14 formed between the first oil chamber 5 and the second oil chamber 12, respectively.
This is a shaft seal and a second shaft seal formed between the second oil chamber 12 and the impeller casing 8.

In addition, 15 is an elbow that communicates with the fluid discharge port 10 of the impeller casing 8, and 16 is the same elbow 15.
7a is the output shaft 7
It is a stirring blade fixed to the lower end of the.

The pressure regulator 2a that constitutes the gist of the present invention substantially has the following features:
It is arranged between the discharge part communication pipe 16 and the second oil chamber 12, and specifically, a variable volume body 1 is provided inside.
The inner chamber of the pressure regulating tank 18 having the pressure regulating tank 7 is connected to the discharge part communication pipe 16, while the variable volume body 17 is connected to the second oil chamber 12 via a required pressure transmission medium (oil in this case). It is constructed by communicating with each other.

Further, the pressure regulator 2b is constructed by disposing a variable volume body 20 in a pressure regulating tank 19 having one end opened into the deep sea, and communicating the variable volume body 20 with the second oil chamber 12. are doing.

Note that 21 and 22 are on-off valves, and 23 is a communication pipe.

[Effect]

Next, the operation of the fluid transfer pump will be explained.

First, when the pump body 1 is installed in a place where the water depth is shallow, the discharge pressure from the fluid discharge port 10 is greater than the hydrostatic pressure around the pump body 1, so the fluid discharge port 10, the elbow 15, the discharge part communication pipe 16, Pressure regulating tank 18, on-off valve 21 in open state, and communication pipe 23
The discharge pressure is transmitted into the second oil chamber 12 via.

On the other hand, when installing in a place with deep water, the hydrostatic pressure around the pump body 1 is higher than the discharge pressure from the fluid outlet 10, so the hydrostatic pressure is The pressure is transmitted into the second oil chamber 12 via the pipe 23, and the pressure in the second shaft sealing portion 14 can be balanced.

Note that FIG. 2 is a modification of the above embodiment, and shows a configuration in which pressure regulators 2a and 2b are connected in series.

In this case as well, the pressure of the shaft seal can be balanced in the same manner as in the above embodiment.

〔Effect of the invention〕

As described above, the present invention has the following effects.

(a) Since the hydrostatic pressure and the discharge pressure can be transmitted to the pump interior through the same connecting piping, the pressure adjustment mechanism can be manufactured at low cost and the mechanism can be easily maintained.

(b) Automatically converts between hydrostatic pressure transmission and discharge pressure transmission depending on the underwater depth, and the greater pressure can always be applied to the pump interior, ensuring that the shaft seal is protected regardless of the position of use. Protection can be complete.

[Brief explanation of the drawing]

FIG. 1 is an enlarged explanatory view of the main parts of a fluid transfer pump according to the present invention. FIG. 2 is an enlarged explanatory view of the main parts of a modified example. In the figure, 1...Pump body, 2a...Pressure regulator, 2b...
Pressure regulator, 3... Oil-immersed electric motor, 4... Frame, 5
...first oil chamber, 6...impeller, 7...output shaft,
7a... Stirring blade, 8... Impeller casing, 9
...Fluid suction port, 10...Fluid discharge port, 11...Connection casing, 12...Second oil chamber, 13...First shaft sealing part, 14...Second shaft sealing part, 15...Elbow, 16...Discharge part communication pipe, 17... Variable volume body, 18... Pressure regulation tank, 19... Pressure regulation tank, 20... Variable volume body, 21
...On-off valve, 22...On-off valve.

Claims (1)

[Scope of Claims] 1. In a fluid transfer pump having a motor chamber inside that is separated by a partition wall having a rotary shaft seal, a pressure regulating tank into which water flows into the pump and a pressure regulating tank arranged within the same pressure tank. a hydrostatic pressure regulator consisting of a water-seal variable volume body that is installed and whose internal volume is varied depending on the water pressure of inflow water; a pressure regulation tank and a synchronized pressure tank into which water discharged from the discharge port of the pump body flows; A discharge pressure regulator consisting of a water-seal variable volume body disposed inside the pump body and whose internal volume is varied by the water pressure of inflow water is attached to the outside of the pump body, and each of the water-seal variable volume bodies is discharged. A fluid transfer pump having an internal pressure adjustment function, characterized in that it communicates with a shaft seal via an on-off valve and a connecting pipe for selecting pressure and hydrostatic pressure.