JPH0723699Y2 - Sewage metering device - Google Patents

Description

[Detailed Description of the Invention] [Industrial field of application] The present invention relates to a sewage metering device that measures pumped-up sewage and quantitatively supplies it to a sewage treatment tank.

[Conventional technology]

As shown in FIG. 8, a general conventional sewage meter has a water inlet 102 with an elbow on one side wall of a box 101.
A water supply port 103 with a joint is provided on the other side wall, and at least three straightening vanes 104a, 104b, 104c are alternately arranged inside the box 101 to form a V-shaped notch. A barrier plate 105 for water is attached to a support plate 106 in front of the water supply port 103 so that its height can be adjusted.

[Problems to be solved by the device]

However, in the above-mentioned sewage metering device, the sewage discharged from the elbow of the water inlet 102 vigorously hits the water surface WL and greatly disturbs the water surface immediately below the elbow when pumping up. It is difficult to obtain such a rectifying effect, and the water surface is still slightly wavy even before the barrier plate 105, which makes it difficult to perform accurate metering.

In addition, as described above, at least three straightening vanes 104a, 104b,
Since a fairly large box is required to arrange the 104c, there is also a problem that the device itself becomes large.

The present invention has been made in view of the above problems, and an object of the present invention is to provide a sewage metering device which is smaller than a conventional device and exhibits an excellent rectification effect.

[Means for Solving the Problems]

In order to achieve the above-mentioned object, the present invention provides a sewage metering device in which a plurality of straightening vanes and a weir plate for measuring are arranged between the water inlet and the water inlet of the box. It is characterized in that a hanging pipe is connected and an opening for ventilation and drainage is formed in the peripheral wall of the pipe.

[Action]

According to the sewage metering device of the present invention, almost all sewage pumped up is discharged below the surface of sewage in the box through the lower end opening of the pipe that hangs near the bottom of the box and the opening of the pipe peripheral wall. Therefore, unlike the conventional device, the water surface is not greatly disturbed. Therefore, even if the number of rectifying plates is reduced, a good rectifying effect can be obtained, so that a smaller box than before can be used.

Further, when the pump is stopped, air enters through the opening of the peripheral wall of the pipe, so that the siphon phenomenon does not cause the dirty water in the box to flow back.

〔Example〕

 Hereinafter, embodiments of the present invention will be described in detail with reference to the drawings.

FIG. 1 is a plan view of a wastewater metering device according to an embodiment of the present invention, FIG. 2 is a sectional view taken along the line ABCDEF in FIG. 1, and FIG. 2 is a sectional view taken along line GG in FIG. 2, and FIG. 4 is a partial sectional view taken along line HH in FIG.

In the figure, 1 is a box made of FRP, and a pair of left and right short pipes 2, 2 that serve as water inlets are attached to the upper part of one side wall 1a thereof. Then, the pipes 3 and 3 hanging down to near the box bottom face 1b are connected to the inner ends of the short pipes 2 and 2 via elbow joints 4 and 4, respectively, and are connected to the outer ends of the short pipes 2 and 2. Are fitted with flanged joints 5, 5 for connecting the water supply pipe, respectively. A large-diameter bent socket 6 for returning overflow water is inserted in the lower portion of the side wall 1a at an intermediate portion of the pipes 3,3.

Slit-shaped openings 3a, 3a for intake and drainage extending from the lower end of the pipe to the vicinity of the upper end are formed on the peripheral wall of the pipe 3,3. The slit-shaped openings 3a, 3a are
As shown in the figure, of the peripheral walls of the pipes 3,3, approximately 1/4 arc portion from the bent socket 6 side to the box side wall 1a side is cut out, and the center of the pipes 3,3 and the slit-shaped opening are formed. Lines L, L connecting the centers of 3a, 3a are set to have an angle of about 30 ° with respect to the center lines 1, 1, of the short tubes 2, 2. And
The lower end openings 3b, 3b of the pipes 3, 3 are obliquely cut so that the portions where the slit-shaped openings 3a, 3a are formed become higher. Therefore, when sewage is supplied from any one of the short pipes 2 (water inlet) by pumping up, most of the sewage is discharged through the slit-shaped opening 3a and the inclined lower end opening 3b of the pipe 3 connected to the short pipe 2, Water surface WL in Box 1
It is designed to be discharged in the direction of the line L below,
When the pump is stopped, air enters from the exposed portion of the slit-shaped opening 3a on the water surface, and the reverse flow of dirty water in the box 1 due to the siphon phenomenon is blocked.

In addition, inside the box 1, two straightening vanes 7 and 8 and a weir plate 9 for measurement are arranged. Further, at the bottom of the other side wall 1c of the box 1, a socket serving as a water supply port is provided. 10 is inserted.

The lower end 7a of the first straightening vane 7 is bent at an angle of about 45 degrees toward the second straightening vane 8, and the bent lower end 7a passes between the bent lower end 7a and the box bottom surface 1b. It is attached in a slightly floating state so that a water gap 11 is formed. On the other hand, the upper end 8a of the second straightening vane 8 attached without a gap to the box bottom surface 1b is bent at an angle of about 60 degrees toward the first straightening vane 7. The water passage 12 formed between the bent upper end 8a and the bent lower end 7a.
Is narrower as it approaches diagonally above. Therefore, the sewage that has passed through the water passage gap 11 is prevented from rising by the bent upper end portion 8a of the second flow straightening plate 8, and is sufficiently rectified while passing through the water passage 12.

Further, the weir plate 9 for measurement is a V-shaped weir 9a as shown in FIG.
The V-shaped weir 9a is provided with a measuring scale 9b on its side edge. The support plate 13 to which the barrier plate 9 is attached also serves as a partition plate that partitions the inside of the box 1 into a water inlet side and a water inlet side, and has a recess 13a larger than the V-shaped weir 9a. Two long holes 13b are formed in the vertical direction on both side edges of the. Then, the dam plate 9 is superposed on the concave portion 13a of the support plate 13, and the bolts 14 are inserted from the dam plate 9 into the elongated holes 13b so that the nut 1
The height is adjustable by tightening with 5.

In this box 1, the FRP as shown in Figs.
A lid 16 made of plastic is put on. The lid 16 has a shape of a hipped roof and has a pair of handles 16a, 16a. The lid 16 having such a shape has an advantage that it has a large strength and is not easily broken because it is dispersed over the whole even when a large load is applied.

The sewage metering device configured as above is a joint with a flange.
A water supply pipe is connected to 5, 5, a return pipe is connected to the bent socket 6, and a water supply pipe is connected to the socket 10 on the opposite side. Then, when the sewage pumped up through one of the water supply pipes is supplied from the one short pipe 2, most of the sewage is the slit-shaped opening 3a of the pipe 3 and the inclined lower end opening 3b as described above. Through, in the direction of the line L below the water surface WL in the box 1. Therefore, unlike the conventional device, sewage discharged from the elbow joint of the water inlet does not collide with the water surface WL and is significantly disturbed, and the discharge pressure of sewage mainly acts in the direction of the line L. There is almost no possibility that sewage passing through the water gap 11 is subjected to an extra discharge pressure to disturb the flow of sewage.

The sewage thus supplied into the box 1 changes its direction at the second straightening vane 8 through the water passage gap 11 and is prevented from rising at the bent upper end 8a of the second straightening vane 8. Further, the direction is further turned toward the first straightening vane 7, and the water is sufficiently straightened through the narrowed water passage 12 as it approaches diagonally upward. In this case, if the lower end of the first straightening vane 7 and the upper end of the second straightening vane 8 are straight, there is a tendency that the straightening is slightly insufficient and the water surface on one side slightly rises. The lower end 7a of the first straightening vane 7 and the upper end 8a of the second straightening vane 8
The waterway that has become narrower as it bends and approaches diagonally above
When 12 is formed, the rectifying action is good and the water surface does not rise. Since the water surface WL of the sewage rectified in this way through the water passage 12 is smooth without waviness or swelling, the sewage water passing through the V-shaped weir 9a can be adjusted by adjusting the mounting position of the weir plate 9 up and down. Can be accurately measured and sent from the water supply port 10 to the treatment tank. Box 1
The excess sewage supplied inside overflows from the upper end opening 6a of the bending socket 6 and is returned.

Next, when the pumping up of the dirty water is stopped, air enters from the exposed portion of the slit-shaped opening 3a on the water surface, and the dirty water inside the water supply pipe and the dirty water inside the box 1 are cut off. Therefore, the reverse flow of the dirty water in the box 1 due to the siphon phenomenon does not occur while the pump-up is stopped.

The sewage metering device of the present invention has been described above with reference to the embodiment, but the present invention is not limited to this embodiment. For example, instead of the slit-shaped opening 3a, a hole shape for intake is formed. Various modifications can be allowed, such as providing the opening and the hole-like opening for drainage separately on the peripheral wall of the pipe 3.

[Effect of device]

As is clear from the above description, in the wastewater metering device of the present invention, almost all the pumped-up wastewater is hung down near the bottom of the box, and the lower end opening of the pipe and the ventilation and drainage openings of the pipe peripheral wall. Since it is discharged below the surface of the sewage in the box, the water surface of the water supply part is not greatly disturbed, and even if the number of rectifying plates is reduced to two, a good rectifying effect is exhibited and Accurate metering can be performed. Therefore, the size of the apparatus can be reduced by using a box that is as small as the number of rectifying plates. Further, when the pump is stopped, air enters through the opening of the peripheral wall of the pipe, so that it is possible to prevent reverse flow of the dirty water in the box due to the siphon phenomenon.

[Brief description of drawings]

FIG. 1 is a plan view of a wastewater metering device according to an embodiment of the present invention, FIG. 2 is a sectional view taken along the line ABCDEF in FIG. 1, and FIG. 2 is a sectional view taken along the line GG, FIG. 4 is a partial sectional view taken along the line HH of FIG. 2, FIG. 5 is a plan view of the lid of the waste water measuring apparatus of the present invention, and FIG. 6 is FIG. 7 is a sectional view taken along line I-I of FIG. 7, FIG. 7 is a sectional view taken along line JJ of FIG. 5, and FIG. 8 is a sectional view of a conventional example. DESCRIPTION OF SYMBOLS 1 ... Box, 1b ... Box bottom, 2 ... Short pipe (water inlet), 3 ... Pipe, 3a ... Intake and drain openings 4
... Elbow joint, 7,8 ... Baffle plate, 9 ... Weir plate, 10 ... Socket (water supply port).

Claims (1)

[Scope of utility model registration request] 1. A sewage metering device in which a plurality of straightening vanes and a weir plate for measuring are arranged between a water inlet and a water outlet of a box, and a pipe hanging down to near the bottom of the box is connected to the water inlet. At the same time, an opening for ventilation and drainage is formed on the peripheral wall of the pipe, and a sewage metering device.