JP6300714B2 - Channel device for flow measurement - Google Patents

Description

  The present invention relates to a flow rate measuring channel device applied to, for example, a sewage (sewage, drainage) pipe or the like.

The sewage usage fee for sewage discharged from large-scale facilities such as ordinary households, bathhouses, hotels, hospitals, condominiums, food processing factories, etc. is set to an amount obtained by multiplying the water supply usage fee by a certain ratio.
However, this sewage usage fee does not reflect the amount of sewage actually discharged by households and facilities. For this reason, an attempt has been made to measure the flow rate of sewage actually discharged.
In general, a flume type flow meter is used (see Patent Documents 1 and 2).

  This flume type flow meter is designed to measure the flow rate by calculating the average flow velocity using the acceleration of gravity against the water depth by narrowing the middle of the water channel, reducing the influence of the downstream, and compared with the method using the weir. Therefore, it is excellent in measuring the flow rate of the canal because the cross section of the canal is very small and there is little uplift to the upstream side.

JP 2005-30881 A Utility Model Registration No. 3061715

However, the flume type flow meter has several conditions for installation.
One is that a straight water channel of 5 to 10 times or more than the flume diameter that secures the natural flow on the upstream side is necessary, and at the same time, it is necessary to secure a straight water channel of twice or more on the downstream side. Secondly, it is easily affected by the upstream side, unsuitable for a superficial water channel, and requires a very gentle gradient with a pipeline gradient of 10 to 20/1000 or less.

  For this reason, in particular, in a flow channel caused by pumping up from the large facility, a flow channel with a large drop, and a water channel with a confluence, a phenomenon occurs in which an intense stream on the upstream side penetrates the flume. . In order to relieve the momentum of the water flow and increase the measurement accuracy, a water channel length for natural flow far exceeding the condition of 5 to 10 times the flume diameter is required on the upstream side. As a result, a vast site for measurement is required, and it may be difficult to install in practice.

The present invention was devised in view of such problems of the prior art, and its purpose is as much as possible by making the flow rate constant for any water flow upstream of the flume flow meter. In order to stabilize the water flow passing through the flume type flow meter, and to install a channel length of 5 to 10 times the flume diameter on the upstream side necessary for measuring the water flow rate with the flume type flow meter. Even if the conditions are met, not to mention natural flow, it is measured regardless of the intense flow from the upstream side in the flow channel by pumping up from a large facility, the channel with a large drop, and the channel with a confluence. you can increase the accuracy, and to provide a flow measurement water MichiSo location that can be easily applied in narrow premises together.

In order to achieve the above object, the flow measuring channel device according to the present invention reduces the flow velocity by meandering the flow of water in the left-right direction in a pipe line upstream of the manhole where the flume type flow meter is installed. rectifying path to exit make gravity flow is provided Te, further, the rectifier circuit consists of a plurality of rectifying plates arranged in a direction perpendicular to the flow direction of the water flowing down the conduit, wherein the current plate is water Are arranged in a zigzag pattern with a predetermined interval in the flow direction of the water, and the flow straightening plate is free of resistance along the flow direction of the water and the descending position that creates a natural flow perpendicular to the flow direction of the water. It is configured to be switchable between two positions, a rising position for flow down .

According to the flow rate measuring water MichiSo location of the structure, the flow rate at the upstream side of the manhole flume flowmeter is installed, to the natural flow conditions by the water flow with a momentum until it is meandering guided to the left and right Is alleviated. Therefore, the flume flow meter can measure the water flow under natural flow.

  According to the present invention, it is possible to make the flow rate constant by easing the natural flow state by meandering the water flow that has been vigorous up to now on the upstream side of the manhole where the flume type flow meter is installed. The measurement with the flume flow meter can measure the water flow under the natural flow, and the measurement accuracy can be improved regardless of the water flow in any situation on the upstream side. As a result, while satisfying the installation condition of providing a pipe length of 5 to 10 times the flume diameter on the upstream side required for measuring the water flow rate with a flume type flow meter, it goes without saying that it will flow from a large facility. The measurement accuracy can be improved regardless of the intense flow from the upstream side in the flow channel due to pump-up, the flow channel with a large drop, and the channel with a confluence. In addition, it can be easily applied even in a small site.

In addition, in this onset bright, rectifying path comprises a plurality of sheets of rectifying plates arranged in a direction perpendicular to the flow direction of the water flowing down the conduit, wherein the rectifier plate at predetermined intervals in the flow-down direction of the water than are disposed on the left and right staggered Te, compared to providing directly rectifying structure the conduit, retrofit is also possible, rich non versatility.

Further, in the present invention, the rectifying plate is configured to be switchable between two positions, a lowered position that creates a natural flow perpendicular to the water flow direction and a raised position that causes the water flow to flow without resistance along the water flow direction. and than that, even if the contaminants come to flow down the flowing water to the rectifier plate entangled, that parallel to the attitude change and water with raising the rectifying plate, inhibiting the flow of contaminants by the rectifying plate the risk of lost, together can be easily flow down the contaminants to a downstream side, such clogging of the conduit also Ru can successfully overcome.

Furthermore, the present invention can be suitably applied to a sewage flow channel as described in claim 2 , and can measure the net sewage (drainage, sewage) flow rate, and the amount of sewage actually discharged at home and facilities. Can be accurately grasped.

It is explanatory drawing explaining the basic composition of the flow volume measuring apparatus of the sewage (drainage, sewage) which shows an example of embodiment of this invention. It is a whole expansion perspective view of a lid holding cylinder. The expanded sectional view of a lid holding cylinder is shown, (A) is a longitudinal section and (B) is an AA line sectional view in Drawing 3 (A). It is a partially omitted enlarged external view of the movable rectifying element. FIG. 4 is a partially omitted enlarged external view showing a first action posture of a movable rectifier element. It is a partially omitted enlarged external view showing a second action posture of the movable rectifier element. It is an action explanatory view of the 1st action posture of a movable rectifier in a rectification way. It is effect | action explanatory drawing of the 2nd action attitude | position of the movable rectifier in a rectification path. It is a partially omitted enlarged external view showing a modification of the movable rectifying element. It is a partially notched enlarged external view of a main part showing a reference example of a rectifying path.

DESCRIPTION OF THE PREFERRED EMBODIMENTS When the flow rate measuring water MichiSo location of the present invention is applied to a flow rate measuring TeiSo location of the sewage, will be explained with reference to the accompanying drawings.

  1-8 shows embodiment of the flow volume measuring apparatus of a sewage.

  FIG. 1 is a diagram illustrating a basic configuration of a sewage flow rate measuring apparatus 1 according to the present invention. This flow measuring device 1 includes a resin-made flume 4 disposed at the bottom of a manhole 3 having a straight wall 2 and a portable or stationary flow meter 5 for measuring the amount of sewage flowing down the flume 4. And a movable rectifying element 7 installed on a cleaning inspection rod 6 as a rectifying plate installation rod disposed on the upstream side of the manhole 3. By this movable rectifier 7, there is a rectifying path CR that creates a natural flow by relaxing the flow velocity in the sewage pipe 8 on the upstream side of the manhole 3 where the flume is installed to meander the flow of water in the left-right direction. Is formed. In the figure, the sewage pipe 8 connecting the manhole 3 and the upstream cleaning inspection rod 6 is represented by a meandering omitted line on the paper surface, but is basically formed in a straight flow path. is there.

  The sewage F rectified by the rectifying channel CR flows from the upstream sewage pipe 8 through the flume 4 to the downstream sewage pipe 9. The sewage F passing through the flume 4 changes from a normal flow state to a limit flow at the throttle portion 4A and further to a jet flow. The flow meter 5 includes a portable water level sensor 10 that measures the flow rate of the sewage F flowing through the flume 4 and a measurement calculation / display unit 11.

  The cleaning inspection rod 6 is provided on the upstream side of the manhole 3 to be separated from the sewage pipe 8 on the upstream side with a dimension of 10 times the diameter of the flume, usually for inspection and cleaning in the sewage pipe 8. The scissors to be installed are composed of a scissors body 12, a cleaning port tube 13, a lid holding cylinder 14, and a lid 15.

  The main body 12 has a bottomed cylindrical shape with a connection port 6A having an upper opening, and a connection port 6B for connecting the upstream sewage pipe 8 and further upstream sewage pipe 16 to the bottom. 6C, synthetic resin such as vinyl chloride resin is injection-molded and integrally molded. On the other hand, the cleaning port tube 13 is inserted into the upper connection port 6 </ b> A of the sewage tub 12, and the lid holding cylinder 14 is inserted into the upper end of the cleaning port tube 13.

As shown in FIG. 2, the lid holding cylinder 14 includes an upper lid receiving cylinder 17 and a lower cylinder 18 integrally connected to the lower portion of the lid receiving cylinder 17.
A lower inner diameter is formed slightly smaller than an upper inner diameter from a portion of the inner periphery of the lid receiving cylinder 17 that is lowered from the upper opening edge 17A of the lid receiving cylinder 17 by about one half of the vertical height. Thus, a lid receiving step portion 19 projecting inward is formed. The inner diameter of the lower cylinder 18 is equal to the inner diameter of the lid receiving step 19 of the lid receiving cylinder 17, but the outer diameter is set to be slightly shorter than the outer diameter of the lid receiving cylinder 17. At the same time, it is lowered by approximately twice the dimension from the upper opening edge 17 </ b> A of the lid receiving cylinder 17 to the lid receiving step 19, and is continuously connected downward from the lower end of the lid receiving cylinder 17. Accordingly, a stepped portion 20 is formed at the lower end of the lid receiving cylinder 17 and is bound inward. The outer diameter of the lower cylindrical body 18 is set to be approximately the same as the inner diameter of the cleaning pipe 13. The cleaning port tube 13, the lid holding cylinder 14, and the lid 15 are formed by injection molding a synthetic resin such as vinyl chloride in the same manner as the bag main body 12. The lid 15 is fitted into the lid receiving cylinder 17 of the cleaning inspection rod 6 and is configured to close the opening of the cleaning inspection rod 6 with the lower surface supported by the lid receiving step 19. Yes.

  The lid holding cylinder 14 is provided with a fitting portion 21 for restricting the position of the movable rectifying element 7 at a symmetric position in the diameter direction. The position restricting fitting portion 21 is a symmetrical position in the diametrical direction of the lid holding cylinder 14 and extends downward from the lid receiving step 19 over a quarter length in the circumferential direction. It is formed by piercing up to a height corresponding to the upper half of 18 vertical heights. As a result, a receiving step 22 of the movable rectifying element 7 obtained by the lower cylindrical body 18 having a small diameter is obtained below the cover receiving step 19.

  Next, as shown in FIG. 4, the movable rectifying element 7 includes a rectifying plate 23 composed of a plurality of (two in the illustrated example) metal (stainless steel) plate members and the cleaning inspection rod 6. And a support plate 24 of an oblong type in plan view that is fitted into a fitting portion 21 provided in the lid holding cylinder 14 and supports the rectifying plate 23. A rectangular inspection port 25 is provided at the center of the support plate 24.

  The rectifying plate 23 has a lower part of the circular cross-sectional shape of the inside of the bag main body 12 divided into upper and lower sides and left and right sides. The support plate 23B is integrally extended upward from a position biased toward the center of the main body 12, and further includes a mounting hole adjusting long hole 23C provided at the upper end of the support plate 23B.

  As shown in FIG. 4, the support plate 24 is formed in an oval shape by cutting off the peripheral side in parallel at an equal distance from the center point of the circular plate, and the rectangular inspection port 25 is formed in the center portion. The interior of the lower sewage pipe can be seen through the inspection port 25 from above. As shown in FIGS. 5 and 6, the length of the support plate 24 in the major axis direction is substantially the same as or slightly shorter than the inner diameter of the lid receiving cylinder 17 of the lid holding cylinder 14. As shown in FIGS. 2 and 3A, the dimension in the minor axis direction is formed substantially equal to the length of the dimension L that linearly connects the circumferential edges 21A of the fitting portion 21. The support plate 24 is configured to be fitted into the fitting portion 21 from above and detachably fitted. In addition, from the above dimension setting, it is configured such that it cannot be rotated or moved left and right after being fitted. In this manner, the support plate 24 is dropped into the fitting portion 21 of the lid holding cylinder 14 and its position is regulated. Furthermore, the thickness of the support plate 24 is much thinner than the vertical depth of the fitting portion 21. Therefore, the support plate 24 is fitted at a sufficient depth from the upper opening edge 17A of the lid receiving cylinder 17 so that the lid receiving cylinder 17 can be completely closed by the lid 15.

  As shown in FIG. 4, the two rectifying plates 23 have a connecting plate 24 </ b> A whose upper ends are integrally protruded from the lower surface of the support plate 24 downward to a predetermined length by appropriate means such as welding. It can be detachably attached by a fixing tool (a nut in the figure) as appropriate, and the attachment position can be adjusted in the vertical direction by means of the long hole 23C. As shown in the figure, the connecting plate 24A is attached diagonally across the center of the support plate 24. Accordingly, the pair of rectifying plates 19 are arranged in a staggered manner as shown in FIGS.

  As shown in FIGS. 5 and 6, the support plate 24 is attached to the lid holding cylinder 14 of the cleaning inspection rod 6 so that the direction of the support plate 24 can be changed by 90 °. That is, the support plate 24 is fitted into the fitting portion 21, and the plate surface 26 of the rectifying plate 23 is directed in a direction orthogonal to the flow of the sewage F 1 flowing through the upstream sewage pipe 16. A first action posture (FIG. 5) for imparting resistance to the flow and the support plate 24 are pulled upward from the fitting portion 21, and the direction is changed by 90 ° from the first action posture, so that the lid receiving step portion 19 The second action of flowing the flow of the sewage F1 downstream without resistance in the same direction as the flow of the sewage F1 flowing on the further upstream sewage pipe 16 through the plate surface 26 of the rectifying plate 23 placed thereon. It is configured to be switchable to the posture (FIG. 6).

  When the water flow is measured by the sewage flow rate measuring device 1 configured as described above, the movable rectifying element 7 incorporated in the cleaning inspection rod 6 is set to the first action posture. The opposing plate portions 23A of the two rectifying plates 23 have their plate surfaces 26 directed in a direction perpendicular to the flow of the sewage F1 in the sewage channel, and are staggered at predetermined intervals along the flow direction of the sewage F1. Will be arranged. Accordingly, as shown in FIG. 7, the flow of the sewage F1 is hindered by the upstream rectifying plate 23 and meanders down to the side without the rectifying plate 23. However, since the flow is hindered again by the counter plate portion 23A of the downstream rectifying plate 23, the flow does not have the rectifying plate 23, but this time meanders in the opposite direction (that is, the movable rectifying element). 7 is the first working posture, and the rectifying path CR is formed). The meandering of the sewage F1 gives resistance to the flow to reduce the flow velocity and works to suppress the turbulent flow, thereby changing the sewage F flowing down from the rectifying plate 23 to the natural flow as much as possible. Then, the rectified sewage F flows from the upstream sewage pipe 8 through the flume 4 to the downstream sewage pipe 9 as shown in FIG. The sewage F passing through the flume 4 changes from a normal flow state to a limit flow at the throttle portion 4A and further changes to a jet flow.

  Next, when the sewage pipe is inspected and cleaned, the support plate 24 is lifted upward, changed in direction by 90 ° from the first action posture, and placed on the lid receiving step 19 as shown in FIG. Thus, the plate surface 26 of the rectifying plate 23 is switched to the second action posture in which the flow of the sewage F1 flows to the downstream side without resistance, in the same direction as the flow of the sewage F1 flowing through the further upstream sewage pipe 16. Since the plate surface 26 of the rectifying plate 23 is parallel to the flow of the sewage F1, the sewage F1 flows downstream without resistance as shown in FIG. Can also flow down to the downstream easily. At this time, the movable rectifying element 7 is pulled upward, and the support plate 24 is placed on the lid receiving step portion 19 of the lid receiving cylinder 17, so that the lid 15 holds the lid holding cylinder. The opening of the body 14 cannot be closed. This is because of the convenience of cleaning and inspection.

  As described above, by providing the movable rectifying element 7 on the upstream side of the flume 4, the sewage F <b> 1 can meander and its momentum is reduced, and any water flow can be changed to a natural flow, so that the flume 4 flows down. Measurement of the amount of water in the sewage F becomes a measurement in a state of natural flow, and unlike the conventional case, measurement accuracy can be increased. Therefore, according to the present invention, although satisfying the installation condition that a pipe length of 5 to 10 times the flume diameter is provided on the upstream side necessary for measuring the water flow rate by the flume type flow meter, it goes without saying that it is a natural facility. The measurement accuracy can be improved regardless of the intense flow from the upstream side in the flow channel by pumping up from the flow channel, the flow channel with large depression, and the water channel with the confluence. In addition, it can be easily applied even in a small site.

  When the movable rectifying element 7 is in its first working posture, the resistance plate portion 23A of the pair of rectifying plates 23 is installed with the plate surface 26 facing in a direction orthogonal to the flow of the sewage F1, and the plate surface 26 The pressing force due to the flow is always loaded. As a result, the load applied to the plate surface 26 may cause the support plate portion 23B of the rectifying plate 23 to bend, push-bend, or shift from the normal staggered setting position. The structure shown in FIG. 9 is a stopper structure for solving this problem. The stopper 27 includes a slipper portion 27A that keeps the mutual spacing in the sewage flow direction of the rectifying plate 23 as set, and a locking portion 27B that keeps a predetermined position in the direction orthogonal to the flow of both the rectifying plates 23. .

The slipper portion 27A includes an end side plate portion 27C fixed to the downstream side surface of the one support plate portion 23A, and an abutment portion 27D that comes into surface contact with the upstream side surface of the other support plate portion 23A. The side plate portion 27C and the abutting portion 27D are integrally connected by a connecting plate portion 27E extending between the edges on the center side of the sewage basin 12 of the both support plate portions 23B to form a crank shape in plan view. In addition, the locking portion 27B is formed of a rectangular metal piece fixed to the tube wall side edge side of the heel body 12 on the upstream side surface of the other support plate portion 23A.
Therefore, the end edge of the abutment portion 27D of the slipper portion 27A is abutted against the locking portion 27B, so that the desired interval between the support plate portions 23A is maintained and the sewage flow direction is maintained. The mutual displacement in the orthogonal direction is prevented, and at the same time, the resistance plate portion 23A is moved away from the tube wall of the bag main body 12 so that the desired staggered arrangement is impaired. Can be prevented. Further, since the abutment portion 27D is only abutted against the locking portion 27B, the abutment is released, and further, the abutment with the upstream side surface of the other support plate portion 23A is released. Since both the supporting plate portions 23B can be bent so that the resistance plate portion 23A moves away from the tube wall of the bag main body 12 and the both supporting plate portions 23B come close to each other, the bulk can be reduced. The entire rectifying element 7 can be easily taken out from the cleaning port pipe 13 to the outside.

The rectifying path CR that creates a natural flow by relaxing the flow velocity by causing the flow of the sewage F1 to meander in the horizontal direction in the pipe line 8 on the upstream side of the manhole 8 in which the flume 4 is installed is the above embodiment. Then, the movable rectifying element 7 is obtained by adopting the first action posture. Instead of this, as shown in FIG. 10 (reference example) , the flow of the sewage F1 on the bottom inner surface of the bowl body 12 In the case where the protruding plate body 231 having the plate surface 230 directed in the direction orthogonal to is integrally provided, the same effect as that obtained when the movable rectifying element 7 is employed can be obtained in the water amount inspection.

The invention is applied to a flow rate measuring TeiSo location of sewage, but as long as it achieves the same purpose, it is suitably applicable to other flowing water of measuring method and apparatus not limited to sewage.

DESCRIPTION OF SYMBOLS 1 ... Flow measuring device 3 ... Manhole 4 ... Flume 6 ... Cleaning inspection rod 7 ... Movable rectifier 14 ... Lid holding cylinder 17 ... Lid receiving cylinder 18 ... Lower cylinder 19 ... Lid receiving step part 21 ... Fitting part 21A ... peripheral edge 22 ... receiving step 23 ... current plate 23A ... resistance plate 24 ... support plate 26, 230 ... plate surface 231 ... protruding plate body CR ... current flow path F, F1 ... sewage

Claims (2)

Flume flowmeter rectifying path to exit make gravity flow by relaxing a falling speed by which meander the flow of water in the left-right direction is provided on the upstream side of the conduit manhole being installed, further, the The rectifying path is composed of a plurality of rectifying plates arranged in a direction orthogonal to the flow direction of the water flowing down in the pipe, and the rectifying plates are arranged in a zigzag manner on the left and right sides with a predetermined interval in the flowing direction of the water. In addition, the rectifying plate is configured to be switchable between two positions, a lowered position that creates a natural flow perpendicular to the water flow direction and a raised position that causes the water flow to flow without resistance along the water flow direction. A channel device for measuring flow rate characterized by the above. The water channel device for flow rate measurement according to claim 1, wherein the water channel for flow rate measurement is a sewer channel .

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