JP3950335B2 - Flow meter and regulator used therefor - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
The present invention relates to a flow meter such as a water meter, and more particularly to a vertical Waltman flow meter and a regulator used therefor.
[0002]
[Prior art]
In the conventional vertical Waltman type flow meter, as shown in FIG. 8, the water (measuring fluid) 15 that has flowed in from the primary side (upstream side) of the water meter passes through the supplementary pipe 8. It enters the lower part of the lower case 9, passes through the rectifier 5 and hits the impeller 6 from the axial direction. The impeller 6 has a plurality of twisted plate blades having an angle with respect to its own rotation shaft 13, and the impeller 6 is rotated by the force of the water flow when water hits the plate blades from substantially the axial direction. To do. The flow rate is measured by mechanically or electrically extracting the number of revolutions, and the flow rate is displayed on the weighing display unit 17 of the upper case 16. The water passing through the impeller 6 is downstream from the outlet of the lower case 9. Flowing into.
[0003]
Here, the purpose or the like to reduce metering errors in accordance with the metering characteristics of the flow meter (water meter), the regulator 1 to adjust the rotational speed of the impeller 6 (rotational speed) is close to the upstream of the impeller 6 It is usually provided. The adjuster 1 rotates and adjusts a guide plate that guides the water flow within a predetermined angle range to slightly change the direction of the water flow that hits the twisted blade of the impeller 6 so that the same flow rate and flow velocity are obtained. However, corrections that increase or decrease the rotational speed of the impeller 6 are performed so that appropriate metering characteristics can be obtained.
[0004]
Conventionally, in this type of adjuster, as shown in FIG. 9 or FIG. 10, the guide plate portion 1 a or 1 b is coaxial with the axis of the rotation shaft that rotatably supports the screw plate 2 or It was fixed or held by 2b, and the rotating shaft and the clamp screw were used on the same axis. Therefore, conventionally, when the adjuster material is made of resin (although there are metal adjusters), the female screw part (nut part) or the holding part, or both parts thereof are made of metal bushes 3, 4 or 3b. This was incorporated into a resin material by press-fitting or insert molding.
[0005]
[Problems to be solved by the invention]
However, in this case, the metal bushes 3, 4 or 3b or the like, or the screw shaft body, or both of these parts are special dedicated parts, resulting in an increase in the number of parts and an increase in the unit price of the parts.
Further, since the fixed (holding) shaft core is installed on the rotating shaft (rotating shaft core), the outer periphery of the shaft core (the outer end portion of the fixing member) protrudes from the flat plate portion serving as the regulator fixing surface. The width dimension (thickness) is increased, making it difficult to reduce the size of the product, and preventing the smooth flow of fluid.
[0006]
An object of the present invention is to achieve a reduction in the number of special dedicated parts and a reduction in the unit price of the flowmeter regulator, and a thin-walled and simple structure regulator with a small amount of protrusion from the flat plate portion, and the adjustment thereof. It is in providing a flow meter provided with a vessel.
[0007]
[Means for Solving the Problems and Effects of the Invention]
The present invention relates to a vertical Waltman type flow meter arranged in a vertical direction so that a rotation axis of an impeller for measuring a fluid flow rate intersects with a direction connecting an inlet and an outlet . A rectifier is provided in the vicinity of the upstream, and the fluid to be measured introduced from the inflow port is rectified by a plurality of ribs provided in the rectifier, and is passed through the impeller while passing from the axial direction. An adjuster is provided for adjusting the rotational speed of the impeller by changing the direction of the flow of the fluid to be measured applied to the impeller when a rotational force is applied to the impeller, and the adjuster is connected to the flow in the rectifier. A flat fluid guide plate portion disposed along the flow direction of the fluid to be measured in the passage, and the fluid guide plate portion formed integrally with the fluid guide plate portion, and the fluid guide plate portion along the flow direction of the fluid to be measured Weighing from state A pivot shaft that can be pivoted to an angle that changes the direction of the body flow, and a fluid guide plate portion that is integrally and intersected with the fluid guide plate portion along the direction of rotation of the fluid guide plate portion. A fixing plate portion, the rotating shaft is supported by a shaft hole provided in the rectifier, and the fixing plate portion is fixed to a fixing surface provided in the rectifier. A fixing member provided at a position separated from the center line by a predetermined distance, and fixing the fluid guide plate portion at a predetermined angle through the fixing plate portion .
[0008]
Further, the rotating shaft is supported by a shaft hole provided in the rectifier, and is separated from the center line of the rotating shaft by a predetermined amount in order to fix the fixing plate portion to a fixing surface provided in the rectifier. And a fixing member that fixes the fluid guide plate portion at a predetermined angle through the fixing plate portion .
[0009]
More specifically, the fixing member is a male screw member that is fastened to the fixing surface, and the fixing plate portion has an arcuate shape along an arc around the rotation axis of the fluid guide plate portion. The male screw member passes through the long hole and is tightened into a screw hole formed in the fixing surface to fix the fluid guide plate portion at a predetermined angular posture, and the fluid The angle orientation of the guide plate portion can be adjusted with the rotating shaft as a fulcrum within the range of the long hole through which the fixing member passes.
[0010]
In addition, the fixed surface provided in the rectifier is a planar form formed on the outer peripheral surface portion of the boss portion present on the center side of the rectifier in parallel with the center line of the boss portion, and the fixed surface includes the shaft. A hole is provided, and the rotation shaft of the fluid guide plate portion is fitted into the shaft hole, the fluid guide plate portion is rotatably provided with the rotation shaft as a fulcrum, and the rotation shaft The fixing plate portion formed in a flat plate shape by the fixing member located at an eccentric portion can be fixed to the fixing surface of the boss portion .
[0011]
As described above, by setting the axis of the rotating shaft of the adjuster and the axis of the fixing member at different positions, it becomes easy to reduce the wall thickness of the adjusting plate, and this reduces the loss. The angle of the water stream can be changed smoothly.
In addition, when a screw component is used as a fixing member for fixing (for holding), a generally used screw component can be used (that is, the rotation shaft and the fixing screw are integrated). It is also possible to omit the fixing (holding) bushing (sleeve) that has been press-fitted into the adjustment plate or insert-molded until now, so that the number of special dedicated parts can be reduced. The cost can be reduced along with the decrease in the cost. In other words, the function of the rectifying plate that maintains the smooth flow of water can be expected, and the resistance can be reduced, resulting in a compact regulator.
[0012]
DETAILED DESCRIPTION OF THE INVENTION
Next, embodiments of the present invention will be described with reference to examples shown in the drawings.
The following example is a flow meter applied to a water meter, for example, and the fluid to be measured in that case is water.
[0013]
Referring to FIG. 8, the entire flow meter 10 will be described. The flow meter 10 includes a supplementary pipe 8, a lower case 9 connected at one end thereof, and an upper member 16 combined with the upper portion of the lower case 9. A rotation support shaft (pivot) 13 that rotatably supports the impeller 6 accommodated in the weighing chamber case 7 is disposed in the vertical direction on the upper portion of the lower case 9. Near the lower side of the impeller 6, a rectifier 5 that rectifies the water flow to the impeller 6 is fitted and fixed in the lower case 9, and is centered on the boss 18 (FIG. 1) on the center side of the rectifier 5. The rotating shaft 13 of the impeller 6 is fixed so as to protrude upward. The impeller 6 is rotatably supported in a pivot shape at the upper end of the rotation support shaft 13 at the bottom of the center hole 11 thereof. The upper end of the impeller 6 is connected to a known measuring mechanism, the rotation of the impeller is taken out mechanically or electrically, the rotation number is converted into a flow rate and displayed on the weighing display unit 17 (FIG. 8), The upper cover 12 can be opened to check the flow rate.
[0014]
The impeller 6 has a plurality of plate blades 6 a (FIG. 1) twisted three-dimensionally with respect to the axial direction of the rotary shaft support 13, and the water flow hitting the plate blades 6 a from below is impeller. A rotational force is applied to 6. The water flow that passes through the impeller 6 in the axial direction and flows out from the upper end of the measuring chamber case 7 changes the flow to the side and flows out from the outlet. A regulator 20 is incorporated in the rectifier 5 adjacent to the lower side of the impeller 6. The adjuster 20 adjusts the rotational speed of the impeller 6 by changing the angle (direction) of the water flow hitting the plate blade 6a of the impeller 6 as described above.
[0015]
As shown in FIG. 1, the adjuster 20 includes a fluid guide plate portion 23 that is rotatably attached to a side surface (a fixed plane 19 that also serves as a guide surface) of the boss portion 18 of the rectifier 5 by a rotation shaft portion 22. And a fixing plate portion 24 integrally formed so as to intersect the inner edge of the guide plate portion 23 at a substantially right angle (L-shape), and the fixing plate portion 24 on the fixing plane 19 of the rectifier 5. And a fixing screw member 25 that is fastened and fixed (held). Both the fluid guide plate portion 23 and the fixing plate portion 24 have a flat plate shape.
[0016]
When the outer peripheral surface of the boss portion 18 is a curved surface such as a cylindrical surface, the side surface portion to which the adjuster 20 is attached is a fixed plane in a form in which a column is cut off by a plane parallel to the center line of the boss portion 18. 19 The fluid guide plate portion 23, the fixing plate portion 24, and the rotation shaft portion 22 of the adjuster 20 are integrally formed of a resin material, and the rotation shaft portion 22 protrudes in a cylindrical shape toward the center side of the rectifier 5. And is rotatably fitted in a shaft hole 26 formed in the fixed plane 19 of the boss portion 18 of the rectifier 5, and the fixing screw member 25 is separated from the rotating shaft portion 22 by a predetermined distance. Located in the site.
[0017]
The fixing plate portion 24 is formed with an arc-shaped elongated hole 27 (FIG. 2) centering on the rotation shaft portion 22 (the axis thereof) of the fluid guide plate portion 23, and a fixing screw member (bolt, screw, etc.) The male screw member 25, which penetrates the elongated hole 27, is tightened into a female screw hole 28 formed on the side surface (fixing plane 19) of the rectifier boss 18, and is a fluid guide plate integrated with the fixing plate 24. The portion 23 is fixed and held at a predetermined angular posture. The arc-shaped elongated hole 27 is positioned so that the fluid guide plate portion 23 is in a neutral position substantially parallel to the rotating shaft 13 of the impeller 6 in a state where the fixing screw member 25 is located at substantially the center (middle point). It is formed. That is, with the center of the arc-shaped elongated hole 27 as a reference position, the elongated holes extend in an arc shape in the first direction and in the second direction opposite to the first direction, thereby forming an integrated elongated hole 27.
[0018]
Then, in a state in which the fixing screw member 25 is loosened, the posture of the fluid guide plate portion 23 of the adjuster 20 together with the fixing plate portion 24 around the rotation shaft portion 22 is substantially parallel to the rotation support shaft 13 of the impeller 6. From the first to the first direction around the rotation shaft portion 22, the angle of the fluid guide plate portion 23 is changed so that the angle of the impeller 6 with respect to the plate blade 6 a becomes small. Is adjusted to decrease. Conversely, when the fluid guide plate 23 is rotated in the second direction to change the angle of the impeller 6 with respect to the plate blade 6a, the rotation speed of the impeller 6 is adjusted to increase. Is done.
[0019]
The rotation limit of the fluid guide plate portion 23 in the deceleration direction of the impeller 6 is defined by one end of the elongated hole 27 of the fixing plate portion 24 coming into contact with the fixing screw member 25, and the impeller speed increasing direction. The rotation limit of the fluid guide plate portion 23 is defined by the other end of the elongated hole 27 of the fixing plate portion 24 coming into contact with the fixing screw member 25. In other words, the arc-shaped elongated hole 27 guides the rotation of the adjuster 20 (fluid guide plate portion 23) and fixes the adjuster 20 at a predetermined angle. It functions as a stopper that defines the rotation limit (or a stopper facing portion if the fixing screw member 25 is used as a stopper).
[0020]
In addition to the case where the fixing plate portion 24 of the adjuster 20 is formed in an L shape on one side of the fluid guide plate portion 23 as shown in FIG. 2, as shown in FIG. 3, the fixing plate portion 24 is formed on both sides from the fluid guide plate portion 23a. It may be formed in a T shape so as to extend at right angles and symmetrically. In the example of FIG. 3, a disk-shaped fixing plate portion 29 is formed on one side edge of the fluid guide plate portion 23 a so as to be orthogonal, and the fluid guide plate portion 23 a is formed in the diameter direction of the fixing plate portion 29. It has an integrated form. The rotation shaft portion 30 of the fluid guide plate portion 23a is formed so as to protrude from the substantially central portion of the circular fixing plate portion 29 to the rectifier boss portion 18 side. 26 (FIG. 1) is rotatably fitted.
[0021]
An arc-shaped elongated hole 31 is formed around the axis of the rotating shaft 30. The elongated hole 31 is symmetrical with respect to the fluid guide plate portion 23a, in other words, the fixing plate portion with respect to the guide plate portion 23a. 29 is formed so as to extend symmetrically on both sides. Also in this example, the rotational speed of the impeller 6 can be adjusted by changing the angle of the water flow with respect to the impeller 6 by loosening the fixing screw member 25 and rotating the guide plate portion 23a by a suitable small angle in a predetermined direction. .
[0022]
Furthermore, in the example shown in FIG. 4, the fixing plate portion 32 is formed integrally with the fluid guide plate portion 23 b so as to be symmetrical and orthogonal to the T shape, and the rotation shaft portion of the fluid guide plate portion 23 b. 33 is rotatably fitted in the shaft hole 26 of the rectifier boss 18. Further, arc-shaped elongated holes 34a and 34b are formed symmetrically on the plate portions on both sides of the fixing plate portion 32 with respect to the fluid guide plate portion 23b, respectively, with the axis of the rotation shaft portion 33 as the center. ing.
[0023]
Correspondingly, the fixing screw member 25 also passes through the long hole 32a and is screwed into a female screw hole 28 (FIG. 1) formed in the fixing plane 19 of the rectifier, and the other screw member 25 is tightened. Two holes are provided which pass through the long hole 32b and are screwed into another female screw hole (not shown) of the fixed plane 19 and tightened. The rotational speed of the impeller 6 can be adjusted by loosening both the fixing screw members 25 and changing the angle of the fluid guide plate portion 23b. If the posture of the fluid guide plate part 23b after the angle adjustment is fixed at two places on both sides of the fluid guide plate part 23b as in this example, the reliability of the fixing is further improved.
[0024]
In FIG. 1, the fluid guide plate portion 23 of the regulator 20 is formed in the radial direction so that a plurality of ribs are connected radially to the outer peripheral case 5 a of the rectifier 5, for example, from the boss portion 18 at the center of the rectifier 5. If so, the regulator can be replaced (replaced) with a part (one or more) of the ribs, or a part of the ribs can be cut away to replace the part. 20 (fluid guide plate portion 23) can be arranged.
[0025]
Furthermore, in the flow path in the lower case 9 in which the water flow flowing into the lower case 9 from the supplementary pipe 8 in FIG. 8 is bent almost 90 degrees so as to change the direction toward the upper impeller 6, As shown in FIG. 5, curved rectifying plates 35 to 37 formed with a predetermined curvature corresponding to the bent portions of the flow paths can be disposed in the vicinity of the lower side. These rectifying plates 35 to 37 prevent the water flow from being disturbed. The rectifying plates 35 to 37 extend a predetermined length along the curve of the tube wall, and the number of arranged plates is, for example, 1 to 4, preferably about 3. Can be used.
[0026]
Further, an appropriate number (for example, one) of ribs 38 extends across each of the rectifying plates 35 to 37 so as to intersect with each of the rectifying plates 35 to 37 so as to be integral with them. Is formed. In other words, the rib 38 connects the current plates 35 to 37 to ensure a certain strength. These rectifying plates 35 to 37 are connected to the lower end of the rectifier 5 and are supported by the rectifier 5 in a fixed position.
[0027]
Then, as shown in FIG. 5, a predetermined one of the curved flow straightening plates 35 to 37, for example, the upper end (impeller wheel) of the flow straightening plate 36 located in the center substantially corresponding to the plane including the rotation axis of the bladed wheel 6. The fluid guide plate portion 23 of the adjuster 20 can be disposed so as to be located on the extension of the end portion on the 6 side. That is, the rectifying plate 36 is curved so as to change the direction of the fluid guided substantially laterally from the inflow side in the longitudinal direction, and near the downstream end, the water flow is guided substantially in the axial direction of the impeller 6 and is positioned in the vicinity thereof. Thus, the fluid guide plate portion 23 is rotatably provided on the rectifier 5.
[0028]
The rotating shaft portion 22 of the fluid guide plate portion 23 is formed close to the upper end portion of the rectifying plate 36, and the lower end side (rotating fulcrum side) of the fluid guide plate portion 23 and the upper end of the rectifying plate 36 are The position is hardly shifted, and the end portion on the impeller 6 side of the fluid guide plate portion 23 is a free end portion. At the reference position of the fluid guide plate portion 23, both the downstream side (upper side) of the rectifying plate 36 and the fluid guide plate portion 23 are arranged in a straight line (so as to be substantially along the axial direction of the impeller 6). The positional relationship is set.
[0029]
Then, the fixing screw member 25 is loosened, and the fluid guide plate portion 23 is rotated around the rotating shaft portion 22 by a small angle in one direction while maintaining continuity with the rectifying plate 36 as shown in FIG. As a result, the rectifying plate 36 and the fluid guide plate portion 23 change from a straight line shape to a somewhat broken line shape. Further, as shown in FIG. 6, when the fluid guide plate portion 23 is rotated in the opposite direction, the rectifying plate 36 and the fluid guide plate portion 23 are slightly linear from the straight line shape to the opposite side to FIG. 5. The correction adjustment for increasing the rotational speed or the correction adjustment for decelerating the rotational speed of the impeller 6 is selected depending on which direction it is rotated.
[0030]
Further, as shown in FIG. 7, the rotation support shaft (pivot) 13 of the impeller 6 is erected on the boss portion 18 of the rectifier 5 as described above. A plurality of ribs 39 to be connected are provided, and the impeller 6 is accommodated in the measuring chamber case 7. In this example, the ribs 39 appear to be formed in a plurality of (for example, four) ribs at equal angular intervals in the radial direction, but in fact, what appears to be one of the ribs 39 is the aforementioned regulator 20 (fluid guide). Plate portion 23).
[0031]
That is, a plurality of (for example, three) ribs 39 connecting the boss portion 18 of the rectifier 5 and the measuring chamber case 7 are formed at a predetermined angular interval (90-degree interval), and the ribs 39 are equally spaced (equally As shown, one adjuster 20 (fluid guide plate portion 23) is attached to the fixed plane 19 of the boss portion 18 and can be rotated in a direction substantially parallel to the tangential direction of the inner circumference of the measuring chamber case 7. It is supported by. Thereby, the function of the baffle plate which maintains the smooth flow of a water flow can be expected, and the resistance can be reduced.
[0032]
In the above description, it is also possible to reverse the vertical (upstream / downstream) relationship between the rotation axis of the adjuster 20 and the fixed axis of the fixing screw member 25 with respect to the water flow. For example, the rotation axis of the adjuster 5 may be set on the downstream side (upper part) of the water flow, and the fixing screw member 25 may be on the upstream side (lower part).
[0033]
In the above description, the mounting position of the adjuster 20 is the side surface of the boss portion 18 of the rectifier 5. However, the present invention is not limited to this, and the adjuster 20 is rotated on the inner surface of the outer peripheral wall (outer case) of the rectifier 20. It may be installed as possible.
[0034]
In the above, the embodiment of the vertical Waltman type flow meter has been described assuming that the supplementary tube 8 is arranged horizontally and the impeller 6 is arranged vertically in FIG. Of course, the flow meter is generally installed and fixed in the arrangement shown in FIG. 8 or the like. However, in the vertical Waltman type flow meter shown in FIG. Thus, it may be installed and fixed in an inverted posture in an angle range of 90 degrees or the like. Expressions such as “upper and lower”, “horizontal” and “vertical” in the above description are for convenience in order to simplify the description, and do not limit the essence of the invention.
[Brief description of the drawings]
FIG. 1 is a cross-sectional view of a main part of a flow meter according to an embodiment of the present invention.
FIG. 2 is a diagram showing a first example of a regulator used in the flow meter.
FIG. 3 is also a diagram showing a second example.
FIG. 4 is also a diagram showing a third example.
FIG. 5 is a front view showing an example in which an adjuster and a curved current plate are combined.
FIG. 6 is a front view in which the angle of the adjuster is changed from FIG.
7 is a plan view of FIGS. 5 and 6. FIG.
FIG. 8 is a cross-sectional view showing the entirety of a vertical Waltman flow meter equipped with a conventional regulator.
FIG. 9 is a cross-sectional view of an essential part showing a first conventional example of a regulator.
FIG. 10 is a cross-sectional view of an essential part showing a second conventional example of a regulator.
[Explanation of symbols]
DESCRIPTION OF SYMBOLS 5 Rectifier 6 Impeller 8 Supplementary pipe 9 Lower case 10 Flowmeter 13 Rotation support shaft 18 Rectifier boss part 19 Boss part fixed plane 20 Adjuster 22, 30, 33 Rotating shaft part 23, 23a, 23b Fluid guide plate part 24, 29, 32 Fixing plate portions 27, 31, 34a, 34b Arc-shaped long holes 35, 36, 37 Current plate 39 Rib

Claims (4)

In the vertical Waltman type flow meter arranged in the vertical direction so that the rotation axis of the impeller for measuring the flow rate of the fluid intersects the direction connecting the inlet and the outlet,
A rectifier is provided in the vicinity of the upstream side of the impeller, and the fluid to be measured introduced from the inlet is rectified by a plurality of ribs provided in the rectifier, and passes through while being applied to the impeller from the axial direction. An adjusting device is provided that adjusts the rotational speed of the impeller by changing the direction of the flow of the fluid to be measured applied to the impeller when the rotational force is applied to the impeller by
The regulator is a flat fluid guide plate portion arranged along the flow direction of the fluid to be measured in the flow path in the rectifier,
A pivot shaft that is integrally formed with the fluid guide plate portion and rotatably holds the fluid guide plate portion from a state along the flow direction of the fluid to be measured to an angle that changes the flow direction of the fluid to be measured. ,
A fixing plate formed integrally and intersecting with the fluid guide plate along the rotation direction of the fluid guide plate;
The rotating shaft is supported by a shaft hole provided in the rectifier,
In order to fix the fixing plate portion to a fixing surface provided in the rectifier, the fluid guide plate is provided at a position separated by a predetermined distance from the center line of the rotating shaft. A flow meter comprising a fixing member for fixing the portion at a predetermined angular attitude. The fixed surface provided in the rectifier is a planar form formed on the outer peripheral surface portion of the boss portion present on the center side of the rectifier in parallel with the center line of the boss portion,
The fixed surface is provided with the shaft hole, and the rotation shaft of the fluid guide plate portion is fitted into the shaft hole, and the fluid guide plate portion is rotatably provided with the rotation shaft as a fulcrum. The flowmeter according to claim 1, wherein the fixing plate portion formed in a flat plate shape by the fixing member located at a portion eccentric from the rotation shaft is fixed to a fixing surface of the boss portion .   The fixing member is a male screw member that is fastened to the fixing surface, and the fixing plate portion is formed with an arc-shaped elongated hole along a circular arc centered on the rotation shaft portion of the fluid guide plate portion. The male screw member passes through the elongated hole and is tightened into a screw hole formed in the fixing surface to fix the fluid guide plate portion at a predetermined angle, and the fluid guide plate portion is The flow meter according to claim 2, wherein the angle posture can be adjusted with the rotation shaft portion as a fulcrum within a range of a long hole through which the fixing member passes. The regulator according to any one of claims 1 to 3 .

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