JP2566193B2 - Dust remover basket - Google Patents

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a basket for a dust remover, and a basket having a novel structure used for a traveling screen or the like.

[0002]

2. Description of the Related Art Traveling screens are widely used as secondary dust removers for intake of large amounts of cooling water in nuclear power plants, thermal power plants and the like. In this type of dust remover, as shown in the side view of FIG. 3, a carrier chain 03 is endlessly applied between a foot sprocket 01 immersed in water in an intake channel and a head sprocket 02 arranged above the water surface. The baskets 04 having wire mesh filters formed by the frame are arranged at equal intervals on the links 08 of the carrier chain 03, and the head sprocket 02 is driven by the motor 05. Then, the basket 04 captures dust in the intake channel and moves upward in the direction of the arrow. When the basket sprocket 02 reverses the dust, the dust captured by the basket 04 naturally falls and collects in the dust trough 07 via the fixed chute 06. To be Traveling screens are generally installed for secondary treatment after primary removal of coarse dust with a fixed bar screen or a bar rotary screen, but jellyfish (water jelly), cloth pieces, vinyl pieces, etc. Soft-body dust (hereinafter referred to as jellyfish) passes through the bar screen and reaches the traveling screen. The screen of the traveling screen has 3-2 openings.
Since it is made of wire mesh of 0 mm, jellyfish and the like are attached to reduce the filtration area, resulting in impaired water flow. As a result, the cooling water intake capacity is reduced. The current electricity demand in Japan has a peak in the summer, and the jellyfish abnormalities occur in the summer as well.
In the summer when these adverse conditions overlap, there is a fear that there will be times when the demand power cannot be covered.

Therefore, Japanese Laid-Open Patent Application No. 3-63309 has been proposed as a screen-type screen provided with measures against jellyfish. This is a mesh screen with a corrugated shape, which increases the filtration area.In addition, bar screens are arranged at half-wave intervals on the front surface of the corrugated surface at half-wave intervals. It is captured to prevent jellyfish from sticking to the mesh surface.

[0004]

However, in such a corrugated wire mesh screen, since the wire mesh is not a flat surface but a curved surface, the overall filtration area of the wire mesh is increased, but the corrugated shape of the flat wire mesh is increased. There is a problem that it takes time to process and assemble and disassemble the dust removing basket.

The present invention has been proposed in view of the above circumstances, and has a significantly large filtration area and is capable of processing wire mesh.
An object of the present invention is to provide a high-performance, energy-saving and economical basket for a dust remover, which is easy to assemble and disassemble, and which is also suitable for removing soft dust such as jellyfish, which also utilizes the dust removing action by the shelves plate. .

[0006]

To this end, the invention according to claim 1 attaches a dust removing basket to each link of the endless chain extending substantially vertically through the water surface of the water intake passage, and the endless chain is circulated. with the movement, in the traveling screen or the like to fall separate upon inversion by the upper sprocket the captured dust by rising basket in a basket posture of ascent, prior to
Half part is almost vertical rectangle, and the latter part is tapered narrower toward the rear
The left and right end plates that form a substantially upside-down symmetrical hexagon that form a trapezoidal equilateral trapezoid, and the long ends in which the rear ends are fixed to the upper sides of the downward slopes of the latter half of both end plates An upper wire mesh stretched over a rectangular frame-shaped upper frame and a long rectangular plate having both ends fixed to the lower side portions of both end plates and the first half portion having an appropriate upslope portion are formed with substantially the same upslope. an elongated lower frame section consists of a lower wire mesh also serves as the rake plate is flat V-shaped Ru stretched elongated rectangular frame-shaped rear half portion extending rearward, both respectively at appropriate large spacing between the two end plates Partitioned parallel to the end plate, the upper and lower sides of the upper frame,
It is required to have a rib plate fixed to the lower frame, an intermediate wire mesh stretched in a rectangular opening partitioned by the rear end of the upper frame, the rear end of the lower frame and the rear end of each rib plate. And

According to a first aspect of the present invention, the vertical base is further partitioned into parallel small spaces in parallel with both end plates, and the upper and lower ends are fixed to the rear end of the upper frame and the rear end of the lower frame, respectively. It is also necessary to have a plurality of shelves plates that have protruding arm portions that extend upward from the lower part of the end portion to the front and that form inverted inverted comb teeth as a whole.
It is a matter.

[0008]

According to this structure, as shown by the white arrow in FIG. 2, the running water flowing in from the front is the downwardly inclined upper wire net forming the latter half of the basket, the vertical intermediate wire net, and the uphill slope. It flows through the lower wire mesh in the direction shown by the solid arrow and flows out rearward. A part of the jellyfish or the like flowing into the upper part of the basket hits the upper wire mesh having an opening of about 10 mm, and a part of the jellyfish is caught by the upper ends of the comb teeth made of the shed shelf plate as the basket is lifted. In order to facilitate the catching and collecting of jellyfish etc., the shelves plate is formed with arm-shaped comb teeth protruding in parallel forward at relatively small intervals of about 30 mm. Similarly, jellyfish in the running water flowing through the middle part of the basket is directly caught by the hook shelf plate, and the remaining jellyfish etc. flowing under the basket are all caught by the lower wire mesh. In this way, the jellyfish and the like caught and collected by the respective parts of the basket are dropped into the trough by the reversal of the head sprocket and the backwash spray. According to the basket of the present invention, since the upper, middle and lower wire nets are arranged in the shape of [], it is easy to design the surface area to be about twice as large as the flow passage cross-sectional area of the inflow water into the basket. It is possible to prevent clogging of the wire mesh due to jellyfish, etc. Also, since a large amount of jellyfish etc. are caught on the shelves plate and captured and rise, the amount trapped by the upper, middle and lower wire nets is reduced by that amount. Clogging is reduced and the dust removal efficiency of the basket is significantly increased. Furthermore, since the wire nets are each flat, processing and mounting work is very easy.

[0009]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Referring to the drawings, an embodiment in which the present invention is applied to a traveling screen will be described. FIG. 1 is a partial front view thereof, and FIG. 2 is a longitudinal sectional view of FIG.

In the above figure, 1 is a pair of end plates that form the left and right ends of the basket, and each end plate has a substantially rectangular shape in the front half as shown in FIG.
It is a hexagon that is almost vertically symmetrical and has an isosceles trapezoid in which the latter half is tapered backward.

Each end plate 1 has a chain link 0
The upper and lower bosses 2, 2 respectively project in the left-right direction at positions close to the upper and lower ends on the vertical center line corresponding to the center line of 8, and the respective end plates 1 are respectively arranged through the pair of bosses 2. It is supported by the link 08 of the opposite carrier chain.

3, the left and right ends are fixed to the upper side portions of the left and right end plates 1, respectively, and the front ends are substantially at the upper ends of the center lines of the respective end plates 1 and the rear ends extending downwardly at the rear are the upper ends of the rear sides of the end plates. The upper frame 3 is a frame-shaped upper frame having a length of about 5 m in the width direction of a waterway that descends to reach a position near the upper frame. The upper frame 3 has rectangular upper openings 3a partitioned by rib plates 5 described later at intervals of 1 m. ing. 3b is an opening 5 to 20 stretched over the upper opening 3a.
The wire mesh of mm is fixed to the four sides of each upper opening 3a at appropriate intervals via a plurality of bolts 3c.

Reference numeral 4 is a flat V whose right and left ends are fixed to the lower sides of the left and right end plates 1 and whose cross section is substantially symmetrical in the longitudinal direction.
It is a lower frame having a length of about 5 m in the width direction of the water channel, and a rectangular lower opening 4a partitioned by a rib plate 5 described later is formed at an interval of 1 m in an upslope portion of the latter half portion. Reference numeral 4b denotes a wire mesh stretched over the lower openings 4a and having the same opening as the upper wire mesh 3b, and its outer peripheral portion is fixed to the four sides of each lower opening 4a through a plurality of bolts 4c at appropriate intervals.

Numeral 5 is arranged in parallel with the end plate at equal intervals of 1 m in the longitudinal direction of each basket, the front end reaches the center line of the basket, and hook-shaped notches 5a are formed along the front half projection of the lower frame 4. It is a rib plate that is notched so that the latter half is a plurality of strength members having an isosceles trapezoidal shape along the latter half of the end plate 1, and the upper side of the downward slope and the flat V-shaped lower side of the upward slope are respectively the upper part. It is welded to the lower surface of the frame 3 and the upper surface of the lower frame 4.

Reference numeral 6a denotes a vertical rectangular intermediate opening formed by the upper frame 3, the lower frame 4 and the rear ends of the end plate 1 or the rib plate 5 and having a length of 1 m.
An intermediate wire mesh 6b having the same opening as that of the upper wire mesh 3b is fixed to each of the intermediate openings 6a at the outer periphery thereof via four bolts 6c to the flanges on the four sides of the intermediate opening 6a.

Reference numeral 7 denotes a scooping shelf plate having a laterally-inverted inverted-letter shape, and upper and lower ends of a vertical base end portion 7b thereof are fixed to a rear end lower surface of an upper frame 3 and a rear end upper surface of a lower frame 4, respectively. A hook portion 7d is projected upward at the tip of the protruding arm portion 7c that extends upward in the forward direction.

In such a structure, as shown by the white arrow in FIG. 2, the flowing water flowing in from the front has a downwardly inclined upper wire net 3a, a vertical intermediate wire net 6b and an upwardly inclined wire which form the latter half of the basket. It flows through the lower wire netting 4b as shown by the solid arrow and flows out rearward. At that time, jellyfish or the like in the running water flowing in the upper portion of each basket hits the upper wire netting 3b, and a part of the jellyfish is caught and captured by the upper end of the protruding arm portion 7c of the shed shelf plate 7 as the basket rises. To be done. In order to facilitate catching jellyfish, the shelves shelf plate 7 projects forward in parallel at small intervals of about 30 mm. Similarly, jellyfish or the like in the running water flowing in the middle of the basket is directly caught by the vertical base end portion 7b of the shed shelf plate 7, and jellyfish or the like flowing in the lower part of the basket is caught by the lower wire net.

In this way, the jellyfish or the like captured by the basket falls into the trough 07 by the reversal of the head sprocket and its backwash spray. According to such a basket, the upper, middle and lower wire meshes 3
b, 6b, and 4b are arranged in a symbol], the filtration area is about 2 of the flow passage cross-sectional area of the inflow water into the basket.
It is easy to design twice, and it is possible to capture and remove a large amount of jellyfish etc. while preventing clogging of the wire mesh due to jellyfish etc. Further, since the wire nets used in the basket of the present invention are each flat, processing and mounting work are easy.

According to this embodiment, by selecting the inclination angles of the upper frame and the lower frame to be less than 30 ° with respect to the horizontal, as described above, the total screen of the upper wire net 3b, the intermediate wire net 6b and the lower wire net 4b. The excess area can be about twice the cross-sectional area of the flow path of the inflow water of the basket. Moreover, since the outer shape of the six-sided basket / end plate fits within the size of a square having one side of the length of the chain link, the present invention can be carried out without increasing the diameters of both sprockets of the endless chain. It is possible.

[0020]

According to such an apparatus, the following effects can be obtained. (1) The clearance between the shelving plates 7 is 30 to 50 mm
Since it is so narrow, quite a lot of parts such as jellyfish are caught by the hook shelf plate, so that the wire mesh is not completely blocked by jellyfish as in the past, and the traveling screen moves stably. can do. (2) Since the total area of the upper, lower, middle, and lower wire nets per basket can be made large enough to reach about twice the cross-sectional area of the front end opening of the basket, in cooperation with the effect of item (1). Since the influence of the decrease in filtration area due to clogging due to jellyfish etc. can be reduced, the decrease in water flow is small. (3) Since the wire mesh used is a rectangular plane, it is easy to disassemble and assemble at low cost. (4) Since the clogging of the wire mesh due to jellyfish is reduced, the operating power cost of the traveling screen can be reduced.

In short, according to the first aspect of the present invention, the filtration area is enlarged, and the high-performance and energy-saving economical which is suitable for removing soft dust such as jellyfish, which is easy to process, assemble and disassemble the wire mesh. The present invention is extremely useful industrially because a dust collector basket is obtained.

According to the invention of claim 2, in addition to the effect of the invention of claim 1, a significant dust removing effect can be exhibited by the shelving plate, so that the present invention is extremely useful industrially.

[Brief description of drawings]

FIG. 1 is a partial front view showing an embodiment of the present invention.

FIG. 2 is a side view of FIG.

FIG. 3 is an overall side view showing a conventional traveling screen.

[Explanation of symbols]

1 end plate, 2 boss, 3 upper frame, 3
a upper opening, 3b upper wire mesh, 3c bolt, 4 lower frame, 4a lower opening, 4b lower wire mesh, 4c bolt, 5 rib plate, 5a hook-shaped notch, 6a intermediate opening, 6b intermediate wire mesh, 6c bolt, 7 scoop Plate, 7b vertical base end, 7c protruding arm, 7d hook

Claims (1)

(57) [Claims] 1. A dust removing basket is attached to each link of an endless chain that extends almost vertically through a water surface of an intake channel, and dust collected by a basket that rises as the endless chain is cyclically moved. In a traveling screen that falls and separates when turned upside down by the upper sprocket, when the basket is in the ascending position, the first half is almost vertical and the second half is tapered backward.
A hexagon that is almost vertically symmetrical and forms an isosceles trapezoid
And left and right ends end plates of eggplant, and an upper wire gauze both ends to the upper side of the down slope of the second half portion is stretched in a long rectangular frame-like upper frame which is fixed in the end plates,
Both ends are fixed to the lower side portions of the both end plates, and the front half portion is formed of a long rectangular plate having an appropriate upslope portion, and is stretched on a long half portion of a long rectangular frame extending rearward at substantially the same upslope. cross-section consists of a lower wire mesh is flat V that
A long lower frame that is shaped like a scooping plate and a rib that divides the end plates in parallel with the end plates in parallel with each other at appropriate intervals, and the upper and lower sides are fixed to the upper frame and the lower frame, respectively. A plate, a rear end of the upper frame, a rear end of the lower frame, an intermediate wire mesh stretched in a rectangular opening partitioned by the rear ends of the rib plates, and the large intervals at both ends.
Partition in parallel with the plate at appropriate small intervals so that the top and bottom edges
It is fixed to the rear end of the upper frame and the rear end of the lower frame respectively.
The protruding base that extends upward from the bottom of the vertical base end
A plurality of comb-shaped teeth that have an inverted L-shape
Basket for dust remover, which is characterized by including a shelving plate .