JPS6237755B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to various strainers at the inlet of a condenser cooling water system of a power plant and other seawater systems.

Conventionally, backwashing blowing has been performed by installing two identical strainer nets and switching the inlet and outlet valves of each strainer, but this requires a large installation space and is complicated to operate.

In addition, the conventional device described above is installed at the condenser inlet of the condenser cooling water system (circulating water pipe) of a power plant to prevent shellfish from entering, but it is expensive. Furthermore, the mounting position is limited due to the structure and the space is large. The present invention takes these into consideration and attempts to deal with the above-mentioned inconveniences by using one strainer instead of using two strainers.

In order to achieve this object, the present invention accommodates a cylindrical stiff net having a large number of pores, and extends the space formed between the casing and the cylindrical stiff net in the axial direction of the cylindrical stiff net. It is divided into two by a partition plate arranged in the cylindrical stiff net, and a switching valve is provided on the upstream side of the cylindrical stiff mesh to selectively guide the fluid to one of the two compartments. Each has a wash water outlet pipe that can be opened and closed.

During normal use, run water along the axis of the strainer.
Foreign matter is allowed to flow into the stiff net from the outside and attached to the outside of the stiff net, and the foreign matter is discharged by opening and closing the blow valve in conjunction with the operation of the switching valve and reversing the flow direction in the stiff net. .

Embodiments of the present invention will be described below with reference to the drawings.

Figures 1a to 1c are a longitudinal cross-sectional view of a first embodiment of the strainer according to the present invention during normal use, a cross-sectional view taken along the line X--X of Figure 1a, and a cross-sectional view taken along the Y-Y line, respectively. .

In these figures, a casing 1 of a strainer according to the invention is joined with a switching valve body 2 to form an outer shell. Reference numeral 3 is a stiff mesh cylinder, which is fitted into the center of the casing 1 and the switching valve main body 2 and supported by support plates 6 and 7. Koshi mesh cylinder 3
The outside of the room is separated by a partition plate 5 extending in the axial direction.
It is divided into two rooms. A semicircular switching valve 4 is provided to switch between the divided chambers, and blow valves 10 and 11 which can be opened and closed are provided at the outlets 8 and 9 for discharging backwash water from the A chamber and the B chamber, respectively. is provided. The strainer configured in this way is connected to the connecting pipe 12,
During normal use, as shown in Figure 1, the switching valve 4 is axially straight (parallel to the flow), and as shown by the arrow, fluid flows from the outside of the stiff net 3 when chambers A and B share, and flows to the inside of the stiff net 3. It passes through and heads from the inlet of the connecting pipe 12 to the outlet. In this case, blow valves 10, 11 are closed. That is, the foreign matter adheres to the outer periphery of the stiff net 3.

If the stiff mesh becomes clogged, first, when backwashing room A, move the switching valve 4 toward room A (rotate it) and open the blow valve 10 at the same time, as shown in Figure 2, and the flow will flow through the stiff mesh as shown by the arrow. The flow flows backwards from the inside of 3 to the outside,
Adhering foreign matter is removed and flowed out of the system through the blow valve 10. B chamber backwashing is performed in the same way as the A chamber backwashing operation by tilting the switching valve 4 toward the B chamber side. (See Figure 3).

The backwash effect of this strainer is obtained by discharging the fluid inside the pipe to the outside of the system (atmospheric pressure or a pressure lower than the internal pressure) due to the internal pressure of the fluid inside the pipe.

This strainer has a switching valve 4, and the valve body 2 is semicircular in Figures 1a to 1c, but the closing accuracy of the valve seat part is not required (even if there is some leakage, it will not affect the performance). ).

It can be thought of as an action like a guide plate for fluid.

The blow valves 10 and 11 use gate valves or butterfly valves and require shutoff.

FIGS. 4a to 4c are a longitudinal sectional view, a side view taken from the line U--U of FIG. 4a, and a sectional view taken from the line V-V of FIG. 4a, respectively, of the second embodiment of the present invention. The only difference from the first embodiment is that the switching valve 4 is square.

In other words, the conventional strainer uses a single strainer with two valves and each inlet and outlet valve is switched for cleaning or backwashing, which requires many operations.
Also, since 4 inlet/outlet valves and 2 strainers are required,
The cost will also be higher. On the other hand, the present strainer is one strainer and only has a switching valve at the inlet, so it is easy to operate, inexpensive, and requires less installation space.

In terms of performance, foreign substances other than shellfish are also completely removed due to backflow.

[Brief explanation of the drawing]

Fig. 1a is a longitudinal sectional view of the first embodiment of the strainer according to the present invention in normal use, Fig. 1b is a sectional view taken along the line X--X of Fig. 1a, and Fig. 1c is a longitudinal sectional view taken along the line Cross-sectional view by line, Figure 2, Figure 3
The figures are longitudinal cross-sectional views of rooms A and B during backwashing, respectively.
Figure a is a sectional view of the embodiment shown in Figure 2, and Figure 4b is a cross-sectional view of the embodiment shown in Figure 2.
FIG. 4c is a side view taken along line U-U in FIG. 4a, and a sectional view taken along line V-V in FIG. 4a. DESCRIPTION OF SYMBOLS 1...Casing, 2...Switching valve body, 3...Koshi net, 4...Switching valve, 5...Partition plate, 6, 7...Support plate,
8, 9... Backwash water outlet, 10, 11... Blow valve, 1
2...Connecting pipe.

Claims (1)

[Claims] 1 A cylindrical stiff net having a large number of pores is housed in a casing, and a space formed between the casing and the cylindrical stiff net is divided by a partition plate arranged in the axial direction of the cylindrical stiff net. A switching valve is provided on the upstream side of the cylindrical stiff mesh to selectively guide the fluid to one of the two compartments, and a wash water outlet that can be opened and closed to each of the two compartments is provided. A strainer characterized by connecting pipes.