JPH048971Y2 - - Google Patents

Description

[Detailed Description of the Invention] Industrial Field of Application The present invention is used in the technical field of efficiently removing foreign matter from flowing water, especially foreign matter from cooling water of a power plant condenser.

BACKGROUND ART A conventional foreign matter removing device of this type will be explained with reference to FIG.

In FIG. 5, a member 8 is extended in a direction perpendicular to the flow direction at substantially the center of the casing 1 forming a part of the flow path of the condenser cooling water, and both ends of this member 8 are connected to the casing 1. It is attached to both sides of 1. Two filter elements 2 are strung diagonally between this member 8 and the inner surface of the casing on the downstream side thereof, and the flow that separates at member 8 forms two flow paths, allowing each of these filter elements 2 to be separately routed. It is made to pass through. A switching valve body 3 is mounted on the member 8 facing upstream, and is normally in a position parallel to the flow (solid line position in Figure 5), but during backwashing, it comes into contact with the casing 1 and switches between the two flows. It can be pivoted to a position (dotted line and imaginary line position) that blocks either of the roads. Reference numeral 4 is a foreign matter discharge port provided in the casing 1;
Reference numeral 6 indicates a discharge valve following this, and reference numeral 5 indicates a discharge pipe piece.

In order to remove foreign matter trapped in the filter element 2, for example, the switching valve body 3 is first moved downward in FIG. 5 (dotted line position). When the lower discharge valve 6 is then opened, the fluid flowing in the upper flow path flows back at the lower filter element 2 and exits through the foreign matter outlet 4 into the discharge pipe piece 5. At this time, foreign matter accumulated in the lower filter element 2 is washed away. It goes without saying that similar operations are performed for the upper filter element.

Problems to be Solved by the Invention The conventional foreign matter removal device as described above has the following problems. That is, the space formed by the switching valve body 3 disposed upstream from the member 8 and the filter element 2 downstream, that is, the space cleaned by the backwash flow is relatively large. . Therefore, unless the position of the foreign matter discharge port 4 and the diameter of the discharge pipe piece 5 are appropriately designed, the filter element cannot be effectively cleaned. In particular, the backwash flow weakens as it goes downstream from the switching valve body, which also makes it impossible to perform effective cleaning.

Further, in a situation where the filter element is clogged, the flow of cooling water is obstructed and an excessive force is applied to the filter element, causing a problem.

Means for Solving the Problems The present invention employs the following means in order to solve the above-mentioned problems. In other words, the present invention is
At least one filter element is provided diagonally from the upstream side to the downstream side inside the casing that forms part of the flow path, and at least one switching valve element and a foreign matter discharge port are provided inside the part surrounded by the filter element and the casing. In addition to arranging
The present invention is characterized in that a safety device/flow guide that can be opened and closed is disposed at an upstream portion in the same plane as the inclined surface of the filter element.

Embodiments Several embodiments of the present invention are shown in FIGS. 1 to 4, and will be described in detail below.

In a first embodiment of the invention shown in FIGS. 1 and 2, a member 8 similar to that described above with respect to FIG. It has been set up. Two filter elements 2 are similarly stretched between this member 8 and the inner surface of the housing 1 on the downstream side, but the filter elements are replaced by a safety device/flow guide 7 up to a certain distance from the member 8. . This safety device/flow guide 7 is a member 8
A plate (preferably a plate coated with vinyl chloride) that extends downstream from the filter element 2 and is normally positioned in alignment with the filter element 2 shown in FIG. It actively plays the role of guiding people towards the future and leading them to the next detail. When the filter element 2 becomes clogged, this safety device/flow guide 7 opens inward as shown in Fig. 2 to secure a flow path in the center of the upper and lower filter elements.
This prevents excessive force from acting on the filter element.

One switching valve body 3 is disposed on the downstream side of the member 8 inside a portion surrounded by the upper and lower filter elements 2 and the casing 1. That is, as shown in FIGS. 1 and 2, the switching valve body 3 is pivoted at the center, and when the flow is interrupted, the tip of one blade is attached to the inner surface of the casing, and the tip of the other blade serves as a safety device and flow guide. 7 and the filter element 2. A foreign matter discharge port 4 following the discharge valve 6 and the discharge pipe piece 5 opens midway between the switching valve body 3 and the casing mounting portion of the filter element 2.

With the above configuration, for example, if the upper switching valve body 3 in FIG. 1 is rotated 90 degrees as shown in the phantom line to close the upper flow path and open the upper discharge valve 6, the upper filter element The foreign matter accumulated in the tapered portion of is washed away from the foreign matter outlet 4 by the backwash flow. Of course, the same applies to the lower flow path. In this case, the space defined by the filter element 2, the casing 1 and the switching valve body 3 is much smaller than in the case described above with reference to FIG. 5, since the switching valve body 3 is located inside the filter element 2. Therefore, the backwashing action by the switching valve body 3 is performed much more effectively.

In addition, as mentioned above, the safety device/flow guide 7
This prevents excessive force from being applied to the filter element when the filter element is clogged.As shown in Figure 2, even in a clogged condition, a flow path is secured in the center of the filter element. be.

In the second embodiment shown in FIG. 3, two switching valve bodies 3 are provided in the filter element space of the casing 1, and when the differential pressure before and after the filter element is small, the switching valve on the most downstream side Using body 3', foreign matter caught in the filter element is discharged from the most downstream foreign matter discharge port 4', foreign matter discharge pipe piece 5', and discharge valve 6', and when the differential pressure becomes large, , the switching valve body 3 and the foreign matter discharge port 4 on the upstream side thereof are used. In this way, by determining the size of the discharge pipe pieces 5, 5' according to the size of the divided space, it is possible to save the amount discharged outside the main stream that is used for filter element cleaning. can.

In the third embodiment shown in FIG. 4, the member 8 is not provided, and a safety device/flow guide 7' consisting of one plate is attached to the side wall of the casing 1, and one filter element 2' is attached to the opposite side from here. It is arranged diagonally to the side wall of the casing. In addition, as in the embodiment shown in FIG.
6' is provided.

According to the means described above, foreign matter in cooling water can be effectively removed. That is, since the switching valve body is disposed inside the filter element, the backwashing space becomes smaller and the backwashing effect can be greatly exhibited. In addition, a flow guide is installed upstream on the same plane as the sloped surface of the filter element that tapers toward the downstream side, which promotes the flow toward the tapered part of the filter element and prevents foreign matter from collecting at the tapered part. is enhanced. Further, in a situation where the filter element is clogged, the safety device can be prevented from opening and excessive force being applied to the filter element.

[Brief explanation of the drawing]

Figures 1 to 4 relate to the present invention; Figure 1 is a sectional view showing the configuration of the first embodiment, Figure 2 is a sectional view explaining its function, and Figure 3 shows the switching valve body in two parts. FIG. 4 is a sectional view of the second embodiment in which two switching valve bodies are installed in a single filter element arranged diagonally.
FIG. 5 is a sectional view showing a conventional foreign matter removing device. 1... Casing, 2, 2'... Filter element, 3, 3'... Switching valve body, 4, 4'... Foreign matter discharge port, 5, 5'... Discharge pipe piece, 6, 6'... Discharge valve, 7, 7'...safety device and flow guide, 8...
…Element.

Claims (1)

[Claims for Utility Model Registration] 1. At least one filter element is provided diagonally from the upstream side to the downstream side inside the casing that forms part of the flow path, and at least one filter element is provided inside the part surrounded by the filter element and the casing. A foreign matter removal device characterized in that a switching valve body and a foreign matter discharge port are provided, and a safety device and flow guide that can be opened and closed is provided at an upstream portion on the same plane as the inclined surface of the filter element. . 2 Utility Model Registration Scope of Claim 1 The foreign matter removing device according to claim 1, characterized in that a plurality of said switching valve bodies and a plurality of said foreign matter discharge ports are provided.