JPH0925887A - Seawater pump - Google Patents

Abstract

PROBLEM TO BE SOLVED: To create such a temperature condition that sea oganisms cannot survive and to dissolve blocking of bearing lubricating water caused by the sticking of sea organisms to a bearing lubricating water passage in a stuffing box. SOLUTION: In a vertical seawater pump of such constitution that a shaft is supported by a bearing and that bearing lubricating water flows in a protecting pipe 12, a stuffing box 2 to be a bearing water lubricating water inflow part, or external bearing lubricating water is heated using an external heat source, and the stuffing box 2 or bearing lubricating water is heated up to such temperature that sea organisms cannot survive.

Description

Detailed Description of the Invention

[0001]

FIELD OF THE INVENTION This invention relates to seawater pumps.

[0002]

2. Description of the Related Art FIG. 3 is a vertical sectional view of a conventional water injection type seawater pump.

In the seawater pump shown in FIG. 3, 1 is a shaft,
2 is a stuffing box for supporting the shaft sealing member, 3 is a bearing, 4 is an implanter attached to the lower portion of the shaft 1, 5
Is a pump suction port at the bottom of the casing, 6 is a casing, 7
Is a support that constitutes a casing, 8 is a discharge casing that constitutes a casing, and 9 is a pump discharge port.

The shaft 1 of the seawater pump is supported by a stuffing box 2 and a bearing 3. The seawater in the pump pit 17 is sucked from the pump suction port 5 by the rotation of the shaft 1 and the impeller 4, and then discharged from the pump discharge port 9 through the casing 6, the support 7 and the discharge casing 8.

Reference numeral 10 denotes an external bearing lubricating water pipe for injecting pumped water taken from the pump discharge port 9 as bearing lubricating water through a strainer 11. The pumped water injected from the stuffing box 2 into the protective pipe 12 is a shaft. 1 and the bearing 3 flow as lubricating water and return to the pump suction port 5. The arrows in the figure show the flow of bearing lubricating water.

Measures for preventing the adhesion of marine organisms in a conventional seawater pump will be described.

(1) A method of preventing adhesion of seawater substances by coating the pump surface with an antifouling paint characterized by extremely small surface roughness has been confirmed to be effective.

(2) A method of making an environment in which marine life cannot survive by injecting chlorine or hydrogen peroxide water or fresh water is also effective.

(3) A method of killing marine life by intermittent operation of a pump is also taken.

A conventional technique of this type is disclosed in, for example, Japanese Patent Laid-Open No.
The one described in JP 62-67297 A is known.

[0011]

A large number of marine organisms flow into the seawater pump together with pumping water and bearing lubricating water that utilizes a part of the seawater in the state of eggs, and adhere to and grow at the site where the flow velocity becomes slow, There is a problem that the flow of the bearing lubricating water can be prevented and the bearing gap can be blocked.

The adhesion of seawater to the seawater pump is a major problem in the operation of the pump, and various methods have been attempted as countermeasures against the problem, but each has its own problems. The problems associated with the above-mentioned conventional techniques are: (1) For antifouling paints, there are problems of coating workability and the problem that the system suspension period is limited due to the need for repair coating. (2) The application of chlorine or hydrogen peroxide water injection is limited because it affects the environment. (3) The intermittent operation of the pump is also effective, but it is necessary to review the system configuration in order to apply it to the system that requires continuous operation.

An object of the present invention relates to adhesion of marine organisms to a bearing lubricating water circulating portion inside a pump upper stuffing box of a portion where marine organisms are likely to adhere, and heats the stuffing box or external bearing lubricating water. In this way, it is possible to provide a seawater pump that prevents marine organisms from adhering to and growing inside the stuffing box, and has less risk of clogging the bearing lubricating water flow path.

[0014]

In order to achieve the above object, a first invention relating to a seawater pump of the present invention supports a shaft with a plurality of bearings, and supports a shaft sealing member on the upper part of the shaft. A stuffing box is provided, and between the stuffing box and the bearing, a protection tube is provided to circulate a part of the pumped water introduced from the stuffing box as bearing lubricating water, and the shaft and the impeller rotate to cause the inside of the casing. In a seawater pump that pumps seawater,
It is provided with a mechanism for forcibly heating the stuffing box from the outside.

In order to achieve the above object, the structure of the second invention relating to the seawater pump of the present invention is a stuffing in which a shaft is supported by a plurality of bearings, and a shaft sealing member is supported on the upper part of the shaft. A box is provided, and between the stuffing box and the bearing, a protection tube is provided to circulate a part of the pumped water introduced from the stuffing box as bearing lubricating water, and seawater is introduced into the casing by rotation of the shaft and the impeller. A seawater pump for pumping water is provided with a mechanism for forcibly heating the bearing lubricating water to a high temperature by heating.

[0016]

According to the seawater pump of the first invention, after the seawater in the pump pit 17 is sucked from the pump suction port 5, the seawater is pumped by the rotation of the impeller 4, passes through the casing, the support, and the discharge casing, and then the discharge port. Is discharged from. A part of the pumped water is taken from the pump discharge port 9, guided to the protective pipe 12 from the stuffing box 2 via the external bearing lubricating water pipe 10, passes through the gap between the bearing 3 and the shaft 1 as lubricating water, and then is sucked into the pump. Return to mouth 5. By directly heating the stuffing box 2 with an external heat source, the inner wall of the stuffing box 2 is set to a temperature condition in which marine life cannot survive. In addition, the temperature of the stuffing box 2 is controlled by the control circuit to a lower limit value at which marine life cannot survive, thereby preventing the pumping temperature from rising more than necessary.

According to the seawater pump of the second invention, the flow of the pumping water and the bearing lubricating water is the same as that of the first invention, and the bearing lubricating water is heated to a high temperature by the heater and the seawater that flows in together with the pumping water The temperature conditions are such that organisms cannot survive. In addition, the control circuit keeps the bearing lubricating water temperature at the lower limit value where marine life cannot survive, and prevents the pumping water temperature from rising more than necessary.

[0018]

Embodiments of the seawater pump of the present invention will be described in detail below with reference to FIG.

[Embodiment 1] FIG. 1 is a vertical sectional view of an upper portion of a seawater pump according to an embodiment of the first invention.

Since the flow of pumping water and bearing lubricating water is the same as that of the conventional seawater pump shown in FIG. 3, description thereof will be omitted, and only the stuffing box and the external bearing lubricating water piping which are problems will be shown here. .

The stuffing box 2 is heated by the heat source 13 provided outside the pump until the inner wall of the stuffing box 2 reaches a temperature at which marine organisms cannot survive, and bearings by adhesion and growth of marine organisms flowing in together with the bearing lubricating water. It is possible to prevent the clogging of the lubricating water. In addition, the control circuit 14 keeps the temperature of the stuffing box at a lower limit value at which marine life cannot survive, and prevents the pumping temperature from rising more than necessary.

[Embodiment 2] FIG. 2 is a vertical sectional view of an upper portion of a seawater pump according to an embodiment of the second invention.

Since the flow of pumping water and bearing lubricating water is the same as that of the conventional seawater pump shown in FIG. 3, the description thereof is omitted, and only the stuffing box and the external bearing lubricating water pipe portion which are problems here are shown. .

In the seawater pump shown in FIG. 2, the bearing lubricating water is heated by the heater 15 to a temperature at which the marine organisms cannot survive, and the bearing lubricating water due to the adhesion and growth of the marine organisms flowing in together with the bearing lubricating water. It is possible to prevent the blockage of. Further, the control circuit 16 controls the stuffing box 2
The temperature of is kept at the lower limit where marine life cannot survive, and the pumping temperature is prevented from rising more than necessary.

[0025]

According to the present invention, by heating the stuffing box or the bearing lubricating water inside the seawater pump, it is possible to prevent marine organisms from adhering to the inside of the stuffing box and to block the passage of the bearing lubricating water by the marine organisms. A seawater pump with less danger can be provided.

[Brief description of drawings]

FIG. 1 is a vertical sectional view of an upper portion of a vertical seawater pump according to a first invention.

FIG. 2 is a vertical cross-sectional view of the upper portion of the vertical seawater pump according to the second invention.

FIG. 3 is a vertical sectional view of a conventional vertical seawater pump.

[Explanation of symbols]

2 ... Stuffing box, 9 ... Pump discharge port, 10 ...
External bearing lubricating water piping, 11 ... strainer, 12 ... protective tube, 14 ... temperature control circuit.

Claims (1)

[Claims] 1. A stuffing box that supports a shaft with a plurality of bearings and a shaft sealing member is provided above the shaft, and is introduced from the stuffing box into a protective tube that connects the shaft and the plurality of bearings. A seawater pump having a mechanism for circulating a part of pumped water as bearing lubricating water, and having a function of forcibly heating the stuffing box from the outside in a seawater pump for pumping seawater into a casing by rotation of the shaft and impeller. A seawater pump characterized by.