JPH0275871A - Cooling water supplying apparatus - Google Patents

Abstract

PURPOSE:To prevent impurities or organic materials from depositing in a valve and a cooler and to always supply sufficient cooling water to the cooler by periodically switching first and second automatic switching valves thereby to reversely feed cooling water during cooling. CONSTITUTION:When a feed water pump 1a is driven in a state that automatic switching valves 13a, 16a are opened and automatic switching valves 13b, 16b are closed, cooling water is supplied from a cooling water exit 8a into a cooler 8 through the valve 13a, and the water from a cooling water exit 8b is drained through the valve 16b. When a predetermined period of time is elapsed, the valves 13a, 16a are closed and the valves 13b, 16b are opened by a timer. Thus, the water discharged from the pump 1a is fed from the exit 8b to the cooler 8 through the valve 13b, discharged from the exit 8a, drained through the valve 16b, and periodically switched to be reversed. Thus, it prevents impurities from depositing in the cooler 8.

Description

DETAILED DESCRIPTION OF THE INVENTION [Object of the Invention] (Industrial Application Field) The present invention relates to a cooling water supply system in a plant having a cooler.

(Prior art) Fig. 6 is a system diagram of a cooling water supply system for a conventional cooler, in which a check valve 2 is provided on the downstream side of the main water supply pump 1a.
A, and a strainer 5a provided with valves 3a and 4a at the front and rear are arranged in sequence, and in parallel with the series circuit of the main water supply pump la, check valve 2a, and strainer 5a, a preliminary water supply pump lb, check valve 2b, and valve 3b, a strainer 5b and a valve 4b are connected in series.

This parallel circuit is connected to a cooling water inlet of a cooler 8 via a conduit 6 and a valve 7, and a flow relay 10 is provided in a water pipe 9 connected to a cooling water outlet of this cooler 8. In addition, the symbols 11, a, and llb in the figure are valves that are normally open.

Therefore, the main water pump 1 is normally operated with the valves 3a, 4a and 7 open and the valves 3b, 4b closed.
a is driven, and the cooling water pumped up by the main water supply pump 1a is supplied to the cooler 8 as shown by the arrow,
There, the water is cooled and then drained through the water pipe 9.

(Problem to be Solved by the Invention) However, in such a device, since the cooling water is flowed in a fixed direction by the water supply pump, if the system is operated for a long time, impurities in the water that cannot be removed by the strainer 5a may enter the system. There is a problem that the water accumulates on the valve 7, cooler 8, etc., causing clogging, and that sufficient cooling water is not supplied to the cooler 8.

In particular, when using river water as cooling water, in places where there is a lot of organic matter in the water, there are problems such as organic matter accumulating in the cooler 8 and the cooler 8 having to be disassembled and cleaned periodically. There is.

In view of these points, the present invention provides a cooling water supply device that can prevent the accumulation of impurities or organic matter on the valve and cooler of the cooling water supply device and can constantly supply sufficient cooling water to the cooler. With the goal.

[Structure of the invention]

(Means for Solving the Problems) In order to achieve the above object, the present invention provides a cooling water supply device in which cooling water supplied by a water supply pump flows through a cooler, and a discharge port of the water supply pump. side,
a first automatic switching valve that selectively communicates with one of the cooling water inlets provided at both ends of the cooler; and a second automatic switching valve that selectively communicates the other of the cooling water inlets with the drainage side. It is characterized by having the following.

Moreover, the second invention connects the cooling water inlets and inlets provided at both ends of the cooler to separate water supply pumps, and connects each water supply pipe connecting the cooler and the water supply pump to each other.
Each of the cooling water inlets is characterized by being provided with an automatic switching valve that selectively connects the cooling water inlet to the water supply pump or the drainage side.

In this case, the automatic switching valve is configured to switch depending on a timer, the pressure difference between the cooling water inflow side and the cooling water outflow side, or the pressure or flow rate on the cooling water outflow side.

(Function) The cooling water supplied by the water supply pump passes through the first automatic switching valve and flows into the cooler from the cooling water inlet and outlet provided at one end of the cooler, and after being cooled to a predetermined level there, the cooling water is transferred to the other end. The cooling water flows out from the cooling water inlet and outflow port, and is discharged through the second automatic switching valve.

Therefore, if the above-mentioned first and second automatic switching valves are switched periodically or in response to fluctuations in the pressure on the outlet side of the cooling water, the direction of the cooling water flowing during cooling will be reversed, causing the cooling water to flow into the cooler, etc. Accumulation of impurities or organic matter in the resulting cooling water is prevented.

Also, in the second invention, the same effect as described above is achieved by switching the water supply pump and the automatic switching valve.

(Example) Hereinafter, an example of the present invention will be described with reference to FIGS. 1 to 5. Note that the same parts in the figure as in FIG. 6 are designated by the same reference numerals, and detailed explanation thereof will be omitted.

FIG. 1 is a system diagram showing one embodiment of the present invention, in which a parallel circuit of water supply pumps la, lb, etc. is connected to a cooler 8 through a conduit 6.
It is connected to a cooling water inlet 8a provided at one end, and a cooling water inlet 8a provided at the other end of the cooler 8.
b is connected to a conduit 12 whose one end is connected to the drain port side.

The conduit 6 is provided with an automatic switching valve 13a, and a flow relay 15 having front and rear valves 14a and 14b is provided near the cooler 8. A flow relay 10 is provided with valves 11a and llb, and an automatic switching valve 16a is provided downstream thereof.

By the way, from the conduit 6, a first branch conduit 17 is branched out from the upstream side of the automatic switching valve 13a, and the other end is
The automatic switching valve 16a of the other conduit 12 is connected to the cooler 8 side. A second branch pipe 18 is also branched out from the conduit 6 from the cooler 8 side than the automatic switching valve 13a, and the other end is connected to the drain port side of the automatic switching valve 16a of the conduit 12. The first and second branch conduits 17.18 each have an automatic switching valve 13b.
, 16b are provided.

First, the automatic switching valves 13a and 16a are opened, and the automatic switching valves 13b and 16b are closed.
When a is driven, the cooling water passes through the automatic switching valve 13a as shown by the arrow in FIG. 16b.

Therefore, after a predetermined period of time has elapsed, a timer (not shown) switches each automatic switching valve 13a, 13b.

16a and 16b are switched. That is, automatic switching valves 13a and 16a are closed, and automatic switching valve 13b is closed.

16b is in an open state.

Then, the cooling water discharged from the water supply pump 1a is
As shown by the arrow in FIG. 2, the cooling water passes through the automatic switching valve 13b and flows into the cooler 8 from the cooling water inlet 8b, where it performs a cooling action, and then flows out from the cooling water inlet 8a and passes through the automatic switching valve 16b. Drained.

Thereafter, the water supply direction of the cooler 8 is alternately switched in the same manner.

In this manner, the flow of the cooling water flowing through the cooler 8 is periodically switched every predetermined period of time so that the flows are in opposite directions, so that impurities and the like are prevented from accumulating on the cooler 8.

By the way, automatic switching valves 13a and 13b1 automatic switching valve 16
The automatic switching valves 13a and 13b constitute a first automatic switching valve, and the automatic switching valves 16a and 16b constitute a second automatic switching valve. are doing. Therefore, instead of providing each switching valve separately as in the above embodiment, a three-way switching valve may be provided at the branch point of the first branch conduit 17 and the confluence point of the second branch conduit 18 with the conduit 12. good.

3 and 4 are system diagrams showing other embodiments of the present invention, in which left and right cooling water inlets 8a, 8 of the cooler °8 are shown.
The outlet sides of the respective water supply pumps la, lb are connected to each of the water supply pumps 1a and 1b via conduits 6.12. And automatic switching valves 13 provided in the conduits 6 and 12, respectively.
a, On the cooler 8 side from 15a, both conduits 6, 1
2 are connected to drain pipes 2o via automatic switching valves 13b and 16b, respectively.

When the automatic switching valves 13a and 16b are opened and the water supply pump 1a is driven with the automatic switching valves 13b and 16a closed, the cooling water flows as shown by the arrow in FIG. When the valves are switched to drive the other water supply pumps 1b, the cooling water flows in as shown by the arrows in FIG. 4, and the directions of the cooling water flowing in the cooler 8 are opposite to each other. Therefore, in this case as well, the same effects as the first invention are achieved.

By the way, in the above example, the switching of the automatic switching valve is performed by a timer, but as shown in FIG. A pressure measuring device 21 may be provided, and the automatic switching valve may be switched based on the pressure difference. Alternatively, the switching may be performed depending on the cooling water pressure or flow rate on the outflow side of the cooler.

〔Effect of the invention〕

Since the present invention is configured as described above, the flow of cooling water flowing inside the cooler can be made to flow in opposite directions to each other periodically or as necessary, and the cooling water generated in the cooler etc. can be made to flow in opposite directions. The accumulation of impurities or organic matter can be prevented, and a sufficient amount of cooling water can always be supplied. In addition, there is an effect that inspection and cleaning of the cooler and the like can be largely omitted.

[Brief explanation of the drawing]

Figures 1 and 2 are a system diagram and an explanatory diagram of its operation of the cooling water supply system of the first invention, and Figures 3 and 4 are
FIG. 5 is a system diagram showing another embodiment of the present invention, and FIG. 6 is a system diagram of a conventional cooling water supply system. 1, a, lb...water supply pump, 6...conduit, 8...
・Cooler, 8a, 8b...Cooling water inlet, 13a,
13b, 16a, 16b--Automatic switching valve. Applicant's agent Mr. Sato Figures 1 and 2 ■ 3rd session ■ Figures 4 and 5

Claims (1)

[Claims] 1. In a cooling water supply device in which cooling water supplied by a water supply pump flows through the inside of the cooler, the discharge port side of the water supply pump is provided at both ends of the cooler. A cooling device characterized by having a first automatic switching valve that selectively communicates with one of the cooling water inlets and a second automatic switching valve that selectively communicates the other of the cooling water inlets with the drainage side. Water supply device. 2. In a cooling water supply device in which cooling water supplied by a water supply pump flows through the cooler, the cooling water inlets provided at both ends of the cooler are connected to separate water supply pumps, and the above-mentioned A cooling water supply device, characterized in that each water supply pipe connecting the cooler and the water supply pump is provided with an automatic switching valve that selectively connects the cooling water inlet to the water supply pump or the drainage side. 3. The cooling water supply device according to claim 1 or 2, wherein the automatic switching valve is switched by a timer. 4. The cooling water supply device according to claim 1 or 2, wherein the automatic switching valve is switched when the pressure difference between the cooling water inflow side and the cooling water outflow side of the cooler reaches a predetermined value. 5. Claim 1 or 2, wherein the automatic switching valve is switched depending on the pressure or flow rate on the cooling water outlet side.
The cooling water supply device described.