JP4177499B2 - Flow meter adjustment device - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
The present invention relates to a flow meter represented by a water meter or the like. More specifically, the present invention relates to a flow meter having a rotation adjusting member arranged at a position in the fluid pipe adjacent to the impeller in order to adjust the rotation state of the flow measurement impeller arranged in the fluid pipe.
[0002]
[Prior art]
A water meter generally includes an impeller that rotates in accordance with a flow rate inside a fluid pipe, and detects the rotation of the impeller by a magnetic sensor and calculates a flow rate based on a detection output.
[0003]
A rectifier, a resistance plate, and the like are attached inside the fluid pipe on the upstream side of the impeller so that the impeller rotates at a predetermined number of rotations according to the flow rate.
[0004]
[Problems to be solved by the invention]
However, adjusting the impeller to rotate with the desired rotational characteristics by attaching rectifiers, resistance plates, etc. is a cumbersome task, and by repeatedly attaching and detaching various types of resistance plates etc. It is necessary to select and install the most suitable resistor plate.
[0005]
An object of the present invention is to propose an apparatus for adjusting a flow meter capable of easily performing rotation adjustment work of an impeller using a rectifier, a resistance plate, and the like.
[0006]
[Means for Solving the Problems]
In order to solve the above-described problems, the present invention provides a rotation adjusting member disposed at a portion in the fluid pipe adjacent to the impeller in order to adjust the rotation state of the impeller for flow rate measurement disposed in the fluid pipe. The fluid pipe is configured by connecting a first pipe and a second pipe, and a part of the inner peripheral surface of the connecting portion of the first pipe and the second pipe is formed on the flow meter adjusting device having In addition, a protrusion or a groove is formed as the rotation adjusting member, and the first and second tubes are connected to each other by connecting means in a state where the relative position in the circumferential direction can be changed. It is characterized by that.
[0007]
In the flow meter of this configuration, when the first and second tubes are relatively rotated, the relative positions of the protrusions or grooves as the rotation adjusting members formed on the first and second tubes change. As a result, the flow of the fluid flowing through these portions changes, and the rotational state of the impeller located on the downstream side changes. Therefore, the rotational state of the impeller can be adjusted to have desired characteristics by adjusting the relative positions in the circumferential direction of the first and second tubes.
[0008]
Here, as connection means for connecting the first and second tubes so as to be relatively rotatable, fastening bolts for fastening and fixing the first and second tubes to each other, and the first and second tubes It is possible to employ a configuration in which the bolt hole is provided in the second pipe and the bolt hole is a long hole that is long in the circumferential direction.
[0009]
In addition, in order to make the relative position of the first and second tubes, in other words, the relative position of the groove or protrusion as the rotation adjusting member, visible from the outside, the first and second tubes It is desirable to adopt a configuration in which an index representing the relative positional relationship in the circumferential direction of these pipes is formed on a part of the outer peripheral surface of the connecting portion.
[0010]
Next, when adjusting the relative rotational positions of the first and second pipes, in order to prevent misalignment of both pipes, the connecting portions of the first and second pipes are It is desirable to form a centering groove or protrusion on the mating surface. For example, it is desirable to form concentric circular protrusions or grooves.
[0011]
In order to define the relative rotational position of the first and second tubes, the relative rotational angle position in the circumferential direction is defined on the mating surface of the connecting portion of the first and second tubes. It is desirable to form a plurality of radially extending protrusions or grooves.
[0018]
DETAILED DESCRIPTION OF THE INVENTION
Embodiments of a water meter to which the present invention is applied will be described below with reference to the drawings.
[0019]
FIG. 1 is a front view and an end view of a water meter according to an embodiment of the present invention . As shown in these drawings, the water meter 1 has a structure in which an upstream first pipe 2 and a downstream second pipe 3 are connected by four fastening bolts 4. Large-diameter flanges 21 and 31 are formed at the connecting portions of the first and second pipes 2 and 3, and the annular mating surfaces 22 and 32 are interposed via an O-ring (see FIG. 2). Are in close contact. In this example, the cable 1a is pulled out from the second tube 3 side, and is connected to the measurement unit side (not shown).
[0020]
FIG. 2 is a schematic longitudinal sectional view of a water meter, a schematic longitudinal sectional view with different cutting positions, and an end view with a fastening bolt omitted. As shown in these drawings, an axial-flow impeller 5 is coaxially arranged inside the connecting portion of the first and second pipes 2 and 3. In this example, the impeller 5 is rotatably supported between bearing portions 23 and 33 that protrude radially inward from the inner peripheral surfaces of the first and second tubes 2 and 3. Yes.
[0021]
A magnet 51 is built in an end portion on the downstream side of the impeller 5, and a magnetic sensor 6 is attached inside the bearing portion 33 of the second pipe 3 facing the magnet 51. When the impeller 5 rotates, a rotating magnetic field is generated by the magnet 51, and a magnetic change of this magnetic field is detected as an electric signal by the magnetic sensor 6, and the detection signal is sent to a measurement unit (not shown) via the cable 4, The flow rate is calculated based on the detection signal in the measurement unit. Since such a detection mechanism is known, further description is omitted in this specification.
[0022]
Here, as can be seen from FIG. 2 (B), four protrusions 7 and 8 extending in the tube axis direction are formed on the inner peripheral surfaces 24 and 34 of the connecting portions of the first and second tubes 2 and 3, respectively. Is formed as a rotation adjusting member of the impeller 5. The protrusion as the rotation adjusting member may be formed on the entire circumference in the circumferential direction, or may be a groove instead of the protrusion. When the protrusions 7 and 8 are shifted relative to each other in the circumferential direction indicated by the arrow in FIG. 2B from the state in which they are aligned with each other, the flow of water passing through the portion depends on the shift amount. The direction changes, and as a result, the inflow direction of the water flow to the impeller 5 located on the downstream side of these protrusions 7 and 8 changes, and the rotational state of the impeller 5 changes. Therefore, it is possible to adjust the impeller 5 to rotate with a desired rotational characteristic by adjusting the relative shift amount of the protrusions 7 and 8.
[0023]
In this example, bolt holes 25 and 35 respectively formed in both flanges 21 and 31 for passing four fastening bolts 4 for connecting the first and second pipes 2 and 3 are shown in FIG. As shown to (C), it is as a long hole long in the circumferential direction.
[0024]
Further, in this example, in order to display the relative rotational positions of the first and second tubes 2 and 3, that is, the shift amounts of both the protrusions 7 and 8, as shown in FIG. On the outer peripheral surfaces of the flanges 21 and 31, scales 26 and 36 for displaying the shift amount are formed, respectively. As the scales 26 and 36, various display forms can be employed. For example, a vernier type such as calipers, a single scale type, or the like can be considered.
[0025]
In the water meter 1 of this example configured as described above, in order to adjust the rotation characteristics of the impeller 5, the first and second pipes 2 and 3 are relatively rotated and formed on their inner peripheral surfaces. What is necessary is just to change the relative position of the protrusions 7 and 8 as the rotation adjusting member. Therefore, the troublesome adjustment work of selecting and attaching a resistance plate or the like having a shape or a dimension capable of obtaining desired characteristics in the pipe as in the prior art becomes unnecessary.
[0026]
Here, when both the pipes 2 and 3 are rotated relative to each other, in order to prevent misalignment of the pipes 2 and 3, the alignment surfaces 22 and 32 of both the pipes 2 and 3 are aligned with each other. It is desirable to form a fitting protrusion and a fitting groove.
[0027]
For example, as shown in FIG. 3A, an arcuate groove 27 is formed in the mating surface 22 of the first tube 2, and the mating surface 32 of the other second tube is fitted into the groove. At the same time, an arcuate protrusion 37 that can slide along the groove may be formed. Instead of arcuate grooves and protrusions, circular grooves and protrusions may be formed.
[0028]
In order to securely fix the relative rotational positions of both the pipes 2 and 3, it is desirable to form fitting projections and grooves for defining the rotational position on both mating surfaces. For example, as shown in FIG. 3B, a radial fitting projection 28 formed at a certain angle is formed on the mating surface 22 of the first tube 2, and the mating surface 32 of the third tube 3 is formed. Also, the radial fitting grooves 38 may be formed at the same angle.
[0029]
(Reference example)
FIGS. 4A and 4B are a schematic longitudinal sectional view and an end view of a water meter as a reference example, and FIG. 5 is a schematic transverse sectional view of a portion cut along AA.
[0030]
In the water meter 10 of this example, the downstream end portion of the impeller 13 for flow rate measurement is rotatably supported by the bearing portion 12 that protrudes inward in the radial direction from the inner peripheral surface of the fluid pipe 11. The upstream end of the vehicle 13 is rotatably supported by the downstream end face of the rectifier 14 attached to the fluid pipe 11.
[0031]
A magnet 15 is embedded at the downstream end of the impeller 13, and a magnetic sensor 16 is disposed opposite to the magnet 15, and a detection signal from here is sent via a cable 17 to a measurement unit (not shown). To be sent out.
[0032]
Here, the rectifier 14 includes a bearing portion 141 that rotatably supports one end of the impeller 13, a plate-like blade portion 142 (see FIG. 5) attached to the upstream side, and the blade portion 142. An annular portion 143 attached to the upstream side of the annular portion 143 is formed with a rib 144 extending in the diameter direction. The rectifier 14 fixes the annular end surface 145 on the downstream side of the annular portion 143 to the annular step surface 111 on the fluid tube 11 side by using four fixing screws 18, so that the fluid pipe 11 is attached.
[0033]
A pair of protrusions 112 and 113 facing each other in the diametrical direction are formed on a portion of the inner peripheral surface of the fluid pipe 11 surrounding the bearing portion 141 on the downstream side of the rectifier 14.
[0034]
By passing through the rectifier 14 and the protrusions 112 and 113, the direction of the water flow is changed to a predetermined direction and flows into the impeller 13 side. Therefore, the rotational characteristics of the impeller 13 are adjusted by adjusting the relative positional relationship between the rectifier 14 and the projections 112 and 113, particularly the relative positional relationship in the circumferential direction between the plate-like blade portion 142 and the projections 112 and 113. Can be adjusted.
[0035]
In this example, the screw holes 146 of the screws 18 fixing the rectifier 14 to the fluid pipe 11 are long holes in the circumferential direction (see FIG. 4B). Therefore, it is possible to easily adjust the attachment position of the rectifier 14 to the fluid pipe 11 in the circumferential direction. When the rectifier 14 is rotated in the circumferential direction, the relative positional relationship between the plate-like blade portion 142 and the projections 112 and 113 formed on the inner peripheral surface of the fluid pipe changes, and as a result, the direction of the water flow flowing through these changes. The rotational characteristics of the impeller 13 can be adjusted to a desired state.
[0036]
Also in this example, fitting grooves and protrusions for center alignment can be formed on the annular end surface 145 and the annular step surface 111, which are the mating surfaces of the rectifier 14 and the fluid pipe 11, respectively.
[0037]
In addition, radial fitting protrusions and grooves for defining the relative rotation angle position can be formed on these mating surfaces.
[0038]
Next, as a mechanism for attaching the rectifier 14 to the fluid pipe 11 so that the attachment position in the circumferential direction can be adjusted, an insertion coupling method (bayonet method) can be adopted. FIG. 6 shows a water meter having a structure in which the rectifier 14 is attached to the fluid pipe 11 by this method. In this case, for example, a pair of protrusions 14a and 14b protruding outward in the radial direction are formed on the outer peripheral surface of the rectifier 14, and these protrusions 14a and 14b are formed on the inner peripheral surface of the fluid pipe 11 with the tube axis. It is only necessary to form grooves 11a and 11b that can be engaged by being pushed in the direction and then rotated. Since the other structure is the same as that of the water meter shown in FIGS.
[0039]
The embodiment shown in FIGS. 1 to 3 relates to a water meter, but the present invention is naturally applicable to a flow meter other than the water meter.
[0040]
【The invention's effect】
As described above, in the flow meter adjusting device of the present invention, the protrusions or grooves formed on the first pipe and the second pipe are employed as the rotation adjusting member of the impeller, and these pipes are relative to each other. A configuration in which the components are mutually connected in a rotatable state is adopted. Therefore, by rotating these pipes relative to each other, the relative positions of the projections or grooves formed on each of them are shifted in the circumferential direction. Therefore, by adjusting the amount of shift, the rotational characteristics of the impeller can be changed to desired characteristics. Can be adjusted. Therefore, the rotation adjustment work of the impeller is simplified.
[0041]
Moreover, since the index which can display such relative deviation | shift amount is formed in the outer surface of the 1st and 2nd pipe | tube, adjustment work becomes easy.
[0042]
Furthermore, since the fitting grooves and protrusions for preventing misalignment are formed on the mating surfaces of the first and second tubes, misalignment during adjustment can be prevented. Similarly, since both fitting surfaces are formed with fitting projections and grooves for defining the rotation angle positions of both tubes, it is easy to connect the tubes to each other in a desired rotation angle state. .
[Brief description of the drawings]
1A and 1B are a front view and an end view of a water meter according to an embodiment of the present invention.
FIGS. 2A to 2C are a schematic longitudinal sectional view of the water meter of FIG. 1, a schematic longitudinal sectional view at different cutting positions, and an end view in a state in which a fastening bolt is omitted, respectively.
3 (A) and 3 (B) are explanatory views showing protrusions and grooves for centering formed on the mating surfaces of both pipes in the water meter of FIG. 1, and radials for defining the rotational angle position, respectively. It is explanatory drawing which shows this protrusion and a groove | channel.
FIGS. 4A and 4B are a schematic longitudinal sectional view and an end view of a water meter of a reference example , respectively.
FIG. 5 is a schematic cross-sectional view of a portion cut along AA in FIG. 4;
6A and 6B are a schematic longitudinal sectional view and an end view showing a modification of the water meter of FIG.
[Explanation of symbols]
DESCRIPTION OF SYMBOLS 1 Water meter 2 1st pipe | tube 3 2nd pipe | tube 21, 31 Flange 22, 32 Matching surface 23, 33 Bearing part 24, 34 Inner peripheral surface 25, 35 Bolt hole 27 Centering groove | channel 37 Centering protrusion 28 Groove 38 for defining rotation angle 38 Protrusion 4 for defining rotation angle Fastening bolt 5 Impeller 6 Magnetic sensor 7, 8 Protrusion (rotation adjusting member of impeller)
10 Water Meter 11 Fluid Pipe 111 Annular Step Surface (Mating Surface)
12 bearing part 13 impeller 14 rectifier 141 bearing part 142 plate-like blade part 143 annular part 145 annular end face (mating face)
146 Screw hole 18 Screw

Claims (5)

In an adjustment device for a flow meter having a rotation adjusting member arranged at a position in the fluid pipe adjacent to the impeller in order to adjust the rotation state of the impeller for flow rate measurement arranged in the fluid pipe,
The fluid pipe is configured by connecting the first and second pipes;
A protrusion or groove as the rotation adjusting member is formed on a part of the inner peripheral surface of the connecting portion of the first and second pipes,
The apparatus for adjusting a flow meter, wherein the first and second pipes are connected to each other by connection means in a state where the relative position in the circumferential direction can be changed. In claim 1,
The connection means includes a fastening bolt for fastening and fixing the first and second pipes to each other, and a bolt hole opened in the first and second pipes. An apparatus for adjusting a flow meter, characterized by being a long hole in a direction. In claim 2,
An apparatus for adjusting a flow meter, wherein an index representing a relative positional relationship in a circumferential direction of the pipes is formed on a part of an outer peripheral surface of a connection portion of the first and second pipes. In claim 2,
An adjusting device for a flow meter, characterized in that a groove or a protrusion for centering is formed on the mating surface of the connecting portion of the first and second pipes. In claim 2,
A flow meter characterized in that a plurality of radially extending projections or grooves for defining a relative rotational angle position in the circumferential direction are formed on the mating surfaces of the connecting portions of the first and second tubes. Adjustment device.

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