JPS5857097A - Underwater machinery - Google Patents

Abstract

PURPOSE:To stabilize the operation under water by adopting a construction to reduce the difference between inside and outside pressures given to a shaft-sealing part down to zero for preventing the flowing-in of the water from the outside and the flowing-out of the oil or the like from the inside. CONSTITUTION:An underwater stirring pump 1 thrown into water and placed at a fixed bottom of the water receives a fixed water pressure as a whole. For adjusting pressures in the first oil chamber 6 and the second oil chamber 10 in a motor chamber, diaphragm variable-capacity bodies 20a and 21a contained in pressure-governor tanks 20 and 21 with oil enclosed inside as pressure medium receive the pressure of the water from under openings 20c and 21c at lower ends of these tanks. This pressure of the water is transmitted via the variable-capacity bodies 20a and 21a. The inner pressure of the second oil chamber 2 is equalized with the pressure of the outside water. Pressure give to a shaft-sealing part 11 from inside and outside a main body are balanced. This construction ensures a perfect sealing, and consequently allows to prevent the flowing-in of the water at the shaft-sealing part 11 and the flowing-out of the oil inside.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to improvements in underwater equipment such as underwater stirring pumps, and particularly to improvements in shaft seals of rotating shafts that protrude outside from the main body of the equipment.

Conventionally, when submersible equipment such as submersible stirring pumps are installed and used in locations with large water depths, the pumps extend outward from the main body of the device to prevent water from entering and penetrating into the main body of the device. The shaft seal of the rotating shaft is sealed using methods such as oil seals, gland backing, and mechanical seals, but these methods require complicated structures due to pressure resistance, and are expensive and maintenance-friendly due to the large size. There were problems, and moreover, it was not possible to exhibit perfect sealing performance. This is because when the device is installed underwater, there is a difference between the external water pressure and the pressure inside the device, and the shaft seal receives greater pressure from the outside and the sealing mechanism of the shaft seal does not lose its original role. Therefore, there has been a desire for a shaft sealing method that eliminates this difference in internal and external pressure and maintains a stable seal.

The present invention was created in order to solve the above-mentioned problems with the shaft sealing part of the rotating shaft in conventional underwater S equipment, and its purpose is to make the difference between the internal and external pressures applied to the shaft sealing part relatively zero. This is to prevent water from entering from the outside and oil, etc. inside the device from flowing out.

The present invention provides a watertight variable volume body which prevents water from flowing into the interior and whose internal volume can be varied by water pressure, in an underwater device having a motor chamber separated by a partition wall having a rotating shaft seal. By installing a pressure regulator outside the underwater equipment and communicating the interior of the pressure regulator with the motor chamber, which is the inside of the water-sensitive variable volume body, that is, the internal space inside the rotating shaft seal part, the pressure around the underwater equipment can be reduced. A hydrostatic variable volume that transmits hydrostatic pressure into the motor chamber to balance the internal pressure and external pressure of the underwater equipment, and also transmits the hydrostatic pressure around the underwater equipment between the sealing materials in the rotating shaft seal part. An underwater device characterized by having a built-in pressure regulator provided outside the underwater device, and a communication path that communicates the base end within the rotary shaft seal portion, and the other end of the communication path is an underwater device. This relates to underwater equipment characterized by having a drain provided on the outside of the equipment.

Hereinafter, a detailed description will be given based on an embodiment shown in the accompanying drawings. In this embodiment, an underwater stirring pump is cited as an example of underwater equipment, and the details of its structure are shown in FIG. In the figure (11 is the submersible stirring pump, (2) is the motor room,
(3) is a completely waterproof 4-il motor formed by extending the output shaft (5) fixedly attached to the impeller (4) downward; (6) is the first oil chamber formed in the oil motor; (7) ) is a grounding frame (8) that rotatably surrounds the impeller (4).
The impeller casing (9) supported above is a connection casing that connects the oil motor (3) and the impeller casing (7), and the connection part with the impeller casing (7) has a required size of space ( S) is configured to be formed. . (A second oil chamber formed by the 1014-year-old connecting casing (9); (II) is a shaft sealing portion disposed in communication with the second oil chamber and the lower space (S); (12) (13) is a stirring blade fixed to the extension part of the output shaft (5) after the impeller (4); (13) is a pressure-feeding connecting elbow for sucking and pumping sand into the ground by the rotation of the impeller (4); (+4) 41 electric wire cable.Furthermore, (
20) and (21) are variable volume bodies (20a) each having a diaphragm inside.

(21a) built-in conduction pipe (20b), (2
1b) First oil chamber (6), second oil chamber +1, respectively
It is a pressure regulating tank that communicates with 1, and the lower end opening of both (20c
).

(21c) is applied to the external hydrostatic pressure via oil sealed as a pressure medium in the diameter waller 16. It can be transmitted to the second oil chamber (6), Ql.

Next, the details of the seal system of the shaft seal (11) are shown in FIG. It is formed so that it is entirely surrounded by a cylindrical ring (22) of a required length that is integrally fixed to the partition wall that partitions the area, and inside it is made of cotton or asbestos string soaked with grease or graphite. A plurality of stuffed fillings (23) are housed in a filled state so as to surround the output shaft (5). As shown in the figure, a filler (23) is provided at one location with an interval of msζ so that an oil reservoir (20) is formed in the intermediate coating.
A conduit tube (25) is attached with the proximal opening located at 4), is connected to the intermediate tube outside the main body, has a diaphragm (26) inside, and seals oil in the ram as a pressure medium. A pressure regulator (27) is installed to regulate the external hydrostatic pressure in the same way as the pressure regulating tank described above.
(27> The pressure medium can be transmitted through the opening (28) into the shaft sealing part (11).Furthermore, in (29), the oil reservoir part (24) has an opening at the base end. It is a pipe installed so that the main body is positioned, and a drain (30) is attached to the outside of the main body.

Also, this drain can be used not only for installation as described above, but also for pressure regulation!
(27) may be provided in the middle of the conduction pipe (25) to which it is attached.

To describe the operation of the submersible stirring pump (1) constructed as described above, first, the pump is placed in water and placed on the desired bottom or floor surface. As a result, ゛C submersible stirring pump (
1) is subject to constant water pressure as a whole, but the pressure in the first oil chamber (6) and second oil chamber 0I of the motor room is controlled by the pressure inside the pressure regulating tanks (20) and (21). The diaphragm variable volume bodies (20a), (21a) each containing oil as a pressure medium receive water pressure from the lower end openings (20c), (21c) at the lower end of the tank, and the water pressure is applied to the variable volume body (20a), (21a). (21a), the pressure in the second oil chamber becomes equal to the water pressure in the outside world, and the pressure applied to the shaft seal part (1) from the inside and outside of the main body is balanced. There will be no leakage.

Furthermore, the oil reservoir (24) inside the shaft seal (IN) transmits external water pressure to the filler (23) by the pressure regulator (27) as described above, so that the second oil chamber Oφ and the oil reservoir (24) The same pressure acts between them, and the pressure difference between them becomes zero, and similarly, the oil reservoir part (24) and the shaft seal part (11)
There is no pressure between the lowest ends, and in addition to sealing the shaft sealing part (11) due to the balance between the pressure inside the oil chamber and the external pressure mentioned above, it is possible to seal even more reliably!'c! Wear. Therefore, the above-mentioned sealing effect of the shaft seal portion (11) can prevent the inflow of external water, so that stable operation in water can be performed.

Further, in the underwater equipment according to the present invention, the shaft seal part has a drain opening, so after working underwater, the equipment is pulled up to the surface of the water and the drain (30) is opened. By opening the drain, water that has leaked into the shaft seal (11) can be discharged, and by knowing the amount, it is possible to determine whether the seal is good or bad, allowing immediate repairs, etc., and indirect This can contribute to maintenance of the shaft seal.

In addition, when a perfect seal is desired, or when the shaft seal is long in the axial direction and there is a large amount of stuffing, external pressure is transmitted from the pressure regulator (27) in two stages as shown in Figure 3. It is sufficient to install the required number of drains (30).

As described above, the underwater equipment having the seal system of the shaft seal portion according to the present invention has the following effects due to its configuration.

(r) Since the M sealing part can be completely sealed, water will not flow in from the gap and no oil will flow out, so underwater operation can be performed stably at all times.

(2) A drain has been provided for the shaft seal, so if it is opened when it is above the water surface, water that has flowed into the space can be drained out, and depending on the amount of water, the shaft seal with a good or bad seal can be disassembled. It is convenient for maintenance and inspection because it can be known indirectly without having to do anything.

[Brief explanation of drawings]

Figure 1 is a side sectional view of the submersible stirring pump, Figure 2 is a side sectional view showing the seal system of the shaft seal, and Figure 3 is the shaft seal seal system when two pressure regulators and a drain are installed. FIG. Agent: Ito 9 Tadashi (and 1 other person)

Claims (2)

[Claims] (1) An underwater device that has a motor chamber inside that is separated by a partition wall that has a rotating shaft seal, and has a water-retaining property that prevents water from flowing into the interior and allows the internal volume to be varied by water pressure. A watertight variable volume body is provided with a container 11' outside the underwater equipment, and the motor chamber forming the inside of the watertight variable volume body, that is, the internal space forming the inner side of the rotating shaft seal portion, and the inside of the pressure regulator. By discharging oil, the hydrostatic pressure around the underwater equipment is transmitted to the motor chamber (1) to balance the internal pressure of the underwater equipment + surface pressure. An underwater device characterized in that a pressure regulator with a built-in water-sensitive variable volume body for transmitting hydrostatic pressure around the device is provided outside the underwater device. (2) Separated by a partition wall having a rotating shaft seal portion. In an underwater device having a motor chamber formed inside the underwater device, a pressure regulator made of a watertight variable volume body that prevents water from flowing into the interior and whose internal volume can be varied by a water IF is provided outside the underwater device, A motor chamber forming the inside of the watertight variable volume body,
In other words, by communicating the internal space inside the rotating shaft seal portion with the inside of the pressure regulator, the hydrostatic pressure around the underwater equipment is transmitted to the E motor chamber, so that the internal pressure of the underwater equipment and the external pressure are balanced. In addition, the hydrostatic pressure around the underwater equipment is transmitted between the sealing materials in the rotary shaft seal. A pressure regulator with a built-in watertight variable volume body is installed outside the underwater equipment, and the base end is communicated within the rotary shaft seal. 1. An underwater device characterized in that: 1, a drain is provided at the other end of the communication path and outside the underwater device;