JP3417678B2 - Flowmeter - Google Patents

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a flow meter, and more particularly to a flow meter constructed so that a meter unit having a rotating body that rotates according to the flow rate of a fluid to be measured can be replaced.

[0002]

2. Description of the Related Art For example, in a turbine type flow meter for measuring the flow rate of gas such as gas, the rotation of a turbine rotor rotating at a rotation speed proportional to the flow rate is detected by a magnetic sensor,
The flow rate is calculated by counting the number of flow rate pulses obtained from the magnetic sensor. In the flow meter, the flanges provided at both ends of the gas pipe are fastened to the flange of the gas pipe with a plurality of bolts.

When the flowmeter is arranged in the middle of the pipe as described above, the flow direction of the fluid to be measured in the flowmeter is determined to be one direction, so that an upstream cone is provided in the flowmeter. The upstream flange is connected to the upstream pipe, and the downstream flange provided with the downstream cone in the flowmeter is connected to the downstream pipe.

In the turbine type flow meter as described above, in order to maintain the accuracy of flow rate measurement, it is necessary to supply the lubricating oil to the bearing that supports the rotating shaft of the turbine rotor as the rotating body.

Therefore, in the turbine type flow meter, as a means for supplying the lubricating oil to the bearing, for example, an oil sump chamber is provided inside a cone member located downstream of the turbine rotor, and a splash plate that rotates together with the rotating shaft is provided. Is configured to splash the lubricating oil in the oil sump chamber onto the bearing. Further, in this type of flow meter, the meter portion having the turbine rotor and the oil sump chamber is detachably provided so as to be detachable from the meter mounting portion of the housing when performing maintenance such as periodic inspection and repair. There is.

[0006]

In order to maintain the accuracy of flow rate measurement, the above flowmeter is regularly inspected and, if necessary, overhauled. As described above, when performing an overhaul, since the meter unit is removed from the meter mounting unit of the housing for inspection and parts replacement, a considerable working time is required. During that time, if the gas supply is stopped, the user will be inconvenienced.Therefore, gas is normally supplied through bypass piping, but the flow rate is not measured during the overhaul work, so the work should be completed in the shortest possible time. Is desired. As a countermeasure, it is possible to shorten the gas supply stop time by replacing the meter with another one.

However, if another meter section is mounted on the meter mounting section of the housing, a step may occur between the upstream and downstream flow paths in the housing and the flow path in the meter section due to processing errors or the like. In this way, when a step is formed between the upstream and downstream flow paths in the housing and the flow path in the meter section, the gas flow passing through the step is disturbed and the measurement accuracy is reduced.

In this case, it is necessary to replace not only the meter section but also the housing itself in a pair, and there is a problem that the maintenance becomes large.

Further, as described above, a drain hole is provided at the bottom of the oil sump chamber for supplying the lubricating oil to the rotating portion, and the drain hole is provided for maintaining the liquid level of the lubricating oil at a predetermined height. The level setting pipe is inserted. However, since the liquid level setting pipe is provided on the drain plug that closes the drain hole and is fixed to the housing, the position of the liquid level setting pipe may shift due to a processing error. In that case, there is a possibility that the liquid level of the lubricating oil is lowered to cause insufficient lubrication or the liquid level is increased to increase the load torque.

Further, when the flowmeter is arranged in the middle of the pipe as described above, the flow direction of the fluid to be measured may be opposite to the direction of the flowmeter. In that case, you must change the direction of the flow meter by removing all the bolts that fixed the flow meter to the pipe.

Therefore, the entire flow meter is removed from the pipe and the direction of the flow meter is reversed, which requires a large amount of work and requires a lot of working time and labor.

Therefore, an object of the present invention is to provide a flow meter that solves the above problems.

[0013]

The invention according to claim 1 is
Meter mounting portion is formed in the central portion, a housing small flow path is formed from the meter mounting portion upstream and downstream side of the meter mounting portion, provided in the meter mounting portion, said Howe
Formed so as to intersect the flow path formed in the ging
A recess, a cone member provided in the meter mounting portion of the housing, a rotating body that rotates downstream of the cone member according to the flow rate of the fluid to be measured, and a support portion that rotatably supports the rotating body. A frame portion that extends from the support portion so as to cover the outer periphery of the rotating body and forms a flow channel that communicates with the upstream / downstream flow channel, and the extending direction of the upstream / downstream flow channel. Intersect with
And a meter unit from the direction Ru mounted in the recess of the meter mounting portion, provided to be measured fluid from the upstream passage to the upstream side end portion of the frame portion so as to guide the flow path of said frame portion, A step absorption part that absorbs a step between the upstream side flow path and the flow path inside the frame part, and the step absorption part is provided on the entire circumference inside the flow path formed in the tubular shape of the frame part. Is a tapered inclined surface, and the inclined surface is inside the flow path at the upstream end.
Formed so that the diameter is larger than the inner diameter of the upstream channel
It is characterized by being done .

According to the second aspect of the present invention, the upstream side of the rotating body is provided.
The inner diameter of the flow path of the frame where the side end surface is located is the upstream flow path.
It is characterized by having a larger diameter than .

[0015]

According to a third aspect of the present invention, there is provided a housing in which a flow passage through which the fluid to be measured flows is formed and a meter mounting portion is formed so as to intersect with the flow passage, and a meter mounting portion of the housing. A pair of cone members that are provided in the sandwiched flow path and are symmetrically provided so as to guide the fluid flowing in the flow path to the meter mounting portion, and the fluid to be measured between the pair of cone members. Of the rotating body, a supporting portion that rotatably supports the rotating body, and a communicating portion that extends from the supporting portion so as to cover the outer circumference of the rotating body and communicates with the upstream and downstream side flow paths. A frame part that forms a flow path, and a meter part that is detachably attachable to the meter mounting part so that the flow rate measurement direction is the forward direction or the reverse direction; Between both ends of the frame and the meter part so as to guide the flow path in the part Vignetting, wherein the step absorption unit which the measuring fluid absorbs the step of passage way is guided to the rotating body, characterized by comprising more.

[0017]

According to the above-mentioned claim 1, the measurement target is measured from the upstream flow path.
A guide is provided at the upstream end of the frame to guide the fluid into the flow path inside the frame.
Since a tapered slope is provided, the meter section
Install in the recess of the meter mounting part from a direction that intersects the extension direction of the
When attached, the fluid to be measured flows smoothly along the tapered inclined surface into the flow path in the frame portion, and the measurement accuracy can be maintained. Furthermore , the flow of the fluid to be measured supplied to the rotating body can be stabilized over the entire circumference of the flow path, and the rotating body can be rotated at a number of revolutions proportional to the flow rate of the fluid to be measured to ensure measurement accuracy. become.

According to claim 2, the upstream end of the rotating body
The inner diameter of the flow path of the frame portion where the surface is located is
Since the diameter is also large, the fluid to be measured is framed along the inclined surface.
Smooth flow in the internal flow path to maintain measurement accuracy
Will be possible.

[0019]

According to the third aspect of the invention, the meter unit can be removably mounted on the meter mounting unit so that the flow rate measuring direction is the forward direction or the reverse direction, and the fluid to be measured is rotated by the step absorbing unit. In order to absorb the level difference in the flow path introduced to the body, remove the meter part only from the meter mounting part of the housing while the housing is connected in the middle of the piping, reverse the direction of the meter part, or replace only the meter part. However, the flow is not disturbed and the measurement accuracy can be maintained.

[0021]

1 to 3 show a first embodiment of a flowmeter according to the present invention.

In each of the drawings, a turbine type flow meter 1 has a cylindrical meter body (housing) 2 having a recess 2a as a mounting portion for mounting a meter portion in the center thereof. A cartridge type meter unit 3 is detachably attached to 2a. The recess 2a intersects with the flow path formed in the meter body 2, and the flow path of the fluid to be measured is the upstream flow path 2b and the recess 2a located on the left side of the recess 2a.
To the downstream side flow passage 2c located on the right side of.

In the upstream flow passage 2b inside the meter body 2,
An upstream cone member 4 that guides the fluid to be measured (in this embodiment, city gas) fed from an upstream pipe (not shown) to the meter unit 3 is inserted. The upstream side cone member 4 is
An annular fixing part 4a fitted and fixed to the opening 2d of the upstream side flow path 2b, a plurality of columns 4b extending from the fixing part 4a in the radial direction of the channel, and a hemisphere supported by the plurality of columns 4b. The cone portion 4c is shaped like a cone, and the cone portion 4c is attached so as to face the upstream pipe (Xa direction).

A downstream cone member 5 for guiding the fluid to be measured fed from a downstream pipe (not shown) to the meter unit 3 is inserted in the downstream flow passage 2c inside the meter body 2.

The downstream cone member 5 is formed integrally with the casing (support portion) 6 of the meter portion 3. The casing 6 is connected to a tubular portion (frame portion) 9 having an inner diameter substantially the same as the inner diameter of the meter main body 2 via a pillar 7 extending upward and a pillar 8 extending downward. That is, the casing 6 is supported in the tubular portion 9 by the columns 7 and 8, and the tubular portion 9
The annular gap between the casing 6 and the casing 6 serves as the flow path 10 through which the fluid to be measured passes.

At the upstream end of the cylindrical portion 9, a tapered inclined surface (step absorbing portion) 9a is provided as shown in an enlarged view in FIG. The inclined surface 9a is formed by chamfering the corner between the upstream end of the tubular portion 9 and the flow path 10,
It is formed on the entire circumference of the tubular portion 9.

The inclined surface 9a is provided so as to guide the fluid to be measured from the upstream flow passage 2b to the flow passage 10. In this embodiment, the inclination angle of the inclined surface 9a is set to about 45 °. ing. Therefore, in the turbine type flow meter 1, the meter unit 3 is regularly inspected to maintain the accuracy of the flow rate measurement, and the meter unit 3 is overhauled as necessary.

As described above, when the meter section 3 is overhauled, the meter section 3 is detached from the meter main body 2 for inspection and parts replacement, so that a considerable work time is required. The working time can be shortened by replacing with the meter unit 3 instead.

In that case, another meter unit 3 is provided in the meter main body 2.
, The upstream and downstream flow paths 2b, 2 due to processing errors and the like.
A step may occur between c and the flow path 10 in the meter unit 3. In this way, even when there is a step between the upstream / downstream channels 2b and 2c and the channel 10 in the meter unit 3, the gas flow from the upstream channel 2b causes the inclined surface 9a to flow.
To reach the flow path 10.

Therefore, even if there is a step between the upstream and downstream flow paths 2b and 2c and the flow path 10 in the meter section 3, it is possible to prevent the flow of gas from being disturbed and the flow rate measurement accuracy from being lowered.

Reference numeral 11 denotes a turbine rotor (rotating body), which has a plurality of blades 11b on the outer circumference of the hub 11a and rotates at a rotational speed proportional to the flow rate of the flow passage 10. A bearing 1 for bearing a rotating shaft 12 of a turbine rotor 11 in a casing 6
3, 14 are held, and the bearing 1 is provided by splash plates 15a, 15b provided near the bearings 13, 14 of the rotary shaft 12.
Refueling of 3 and 14 is performed. That is, the oil sump chamber 16 is formed in the internal space of the casing 6, and the splash plates 15a and 15b splash the lubricating oil stored in the oil sump chamber 16 as the turbine rotor 11 rotates, and the bearing 1
Refuel to 3,14.

When measuring the flow rate, the rotation of the turbine rotor 11 is detected by the magnetic sensor 17 for detecting rotation. The magnetic sensor 17 is composed of, for example, a magnetic resistance element, is close to the magnet 18 provided on the rotary shaft 12, and
Outputs a signal according to the rotation speed of. The magnet 18
Is formed into a cylindrical shape, and S poles and N poles are alternately magnetized in the circumferential direction.

In the case shown in FIG. 1, the left side of the turbine type flow meter 1 is the upstream pipe and the right side is the downstream pipe, and the gas to be measured flows in the Xb direction. 2b, is guided to the blades 11b of the turbine rotor 11 by the first cone member 4, passes through the flow passage 10, and flows from the second flow passage 2c to the downstream pipe. for that reason,
The turbine rotor 11 rotates at a rotation speed proportional to the flow rate of the flow path 10. The rotation of the turbine rotor 11 is
It is detected by the magnetic sensor 17, and the flow rate measurement value is calculated by a flow rate calculation unit (not shown).

Reference numeral 19 is a sensor holding member, and the magnetic sensor 17 is housed inside the cylindrical portion 19a at the bottom of the hollow portion 19b. In addition, a hollow portion 19 is provided at the center of the hexagonal portion 19d.
The upper end of b is open, and the magnetic sensor 17
The signal cable 20 of is pulled out to the outside.

Reference numeral 21 is a support plate for supporting the sensor holding member 19, which is fixed to the upper surface 24a of the lid 24 with bolts 23. The lid 24 is fixed to the upper portion of the meter body 2 with bolts 25 and the upper opening of the recess 2a. Close the lid.

The cylindrical portion 19a of the sensor holding member 19
Is inserted into the hole 24b of the lid 24, further moved in the hanging direction, and inserted into the hole 7a provided in the column 7 of the meter main body 2. With this, the lower end portion of the cylindrical portion 19a accommodating the magnetic sensor 17 penetrates the upper opening 6a of the casing 6 and is inserted into the casing 6.

Further, the meter body 2 is provided with a drain valve 30.
Is attached. The drain valve 30 has a drain main body 30a that contacts the lower portion 2f of the meter main body 2 and an insertion portion 30b that is inserted into an insertion hole 2g that extends upward from the lower portion 2f.

Reference numeral 31 is a liquid level setting pipe, and as shown in FIG. 3, a fixed portion 31a press-fitted into an insertion hole 8a formed in the support column 8 and a pipe 31 extending above the fixed portion 31a.
b, and a through hole 31c that vertically penetrates the fixing portion 31a and the pipe 31b.

The liquid level setting pipe 31 is a pipe 31b.
Since the fixing portion 31a is press-fitted and fixed in the insertion hole 8a of the support column 8 so that the position of the upper end of the pipe is a predetermined height, the liquid level of the lubricating oil stored in the oil sump chamber 16 is the upper end of the pipe 31b. Depends on the position of.

The liquid level of this lubricating oil stably supplies the lubricating oil to the bearings 13 and 14 bearing the rotating shaft 12 and also splashes the lubricating plate 15a as a lubricating oil supply unit for supplying the lubricating oil to the rotating portion. , 15b to keep the load torque constant, the dimension at which the tips of the splash plates 15a, 15b dive into the lubricating oil is set to a predetermined dimension L.

Even when the meter unit 3 is replaced as described above, the liquid level setting pipe 31 is provided with the insertion hole 8 of the support column 8.
It is removed from the meter main body 2 together with the meter unit 3 while being pressed into a. Therefore, the mounting position of the drain valve 30 is deviated due to a processing error.
Even when the is installed, the liquid level setting pipe 3
The position of 1 does not shift, and the liquid level of the lubricating oil stored in the oil sump chamber 16 is always kept constant.

A second embodiment of the present invention is shown in FIGS. 4 to 7, the same parts as those in the first embodiment are designated by the same reference numerals and the description thereof will be omitted.

In each of the drawings, the turbine type flow meter 41 has a cylindrical meter body (flow meter body) 2 having a recess 2a as a mounting portion for mounting the meter portion in the central portion. A cartridge-type meter unit 3 is detachably attached to the recess 2a.

The recess 2a intersects the flow path formed in the meter body 2, and the flow path through which the fluid to be measured flows is the same as the first flow path 2b located on the left side of the recess 2a. It is divided into a second flow path 2c located on the right side of the place 2a. Incidentally, FIG.
Then, the first flow channel 2b becomes the upstream flow channel, and the second flow channel 2c becomes the downstream flow channel.

In the first flow path 2b inside the meter main body 2,
A first cone member 4 that guides a gas as a fluid to be measured fed from an upstream pipe (not shown) to the meter unit 3 is inserted. In addition, in the second flow passage 2c inside the meter body 2,
A second cone member 5 that guides the fluid to be measured fed from a downstream pipe (not shown) to the meter unit 3 is inserted.

The second cone member 5 has the same structure as the first cone member 4, and the opening 2e of the second flow path 2c.
An annular fixing portion 5a fitted and fixed to the plurality of columns, a plurality of support pillars 5b extending from the fixing portion 5a in the radial direction of the flow path, and a hemispherical cone portion 5c supported by the plurality of support pillars 5b. The cone portion 5c is attached so as to face the opening 2e of the second flow path 2c.

Therefore, the first cone member 4 and the second cone member 5 have the same shape, but are mounted in opposite directions. That is, the first cone member 4 and the second cone member 5 are arranged so as to be symmetrical with respect to an axis O extending vertically in the middle of the recess 2a formed in the center of the meter body 2. ing.

The structure of the meter section 3 is the same as that of the first embodiment.

In the case shown in FIG. 5, the left side of the turbine type flow meter 41 is the upstream pipe and the right side is the downstream pipe, and the gas to be measured flows in the Xb direction. 2b, is guided to the blades 11b of the turbine rotor 11 by the first cone member 4, passes through the flow passage 10, and flows from the second flow passage 2c to the downstream pipe. Therefore, the turbine rotor 11 rotates at a rotation speed proportional to the flow rate of the flow path 10. The rotation of the turbine rotor 11 is detected by the magnetic sensor 17, and the flow rate calculation unit (not shown) calculates the flow rate measurement value.

In the tubular portion 9 of the meter portion 3, the distance La from the axis O to the end surface 9b in the Xa direction is equal to the distance Lb from the axis O to the end surface 9b in the Xb direction (La
= Lb). Further, the support plate 21 and the lid 24 are formed so as to be symmetrical with respect to the axis O, and the screw hole 21a of the support plate 21, the hole 24b of the lid 24, the hole 7a of the support column 7, the upper portion of the casing 6 are provided. The openings 6a are arranged coaxially with the axis O, respectively.

The insertion hole 2g and the insertion hole 8a are also provided coaxially with the axis O, and are attached so that the center of the insertion portion 30b coincides with the axis O.

The liquid level setting pipe 31 is a pipe 31b.
Since the fixed portion 31a is press-fitted and fixed to the insertion hole 8a of the support 8 so that the position of the upper end of the pipe 31b becomes a predetermined height, the pipe 31b is rotated when the meter portion 3 is inverted as described later.
The insertion position of is not displaced.

Next, the turbine type flow meter 4 having the above structure
1 is disposed in the middle of the gas pipe (not shown) and the meter main body 2
After the flanges 2i and 2j provided on both ends of the turbine are connected to the flange (not shown) of the gas pipe by a plurality of bolts, the measurement direction of the turbine type flow meter 41 is opposite to the flow direction of the fluid to be measured. I will explain the case when I noticed that.

In this case, after confirming that the gas is not yet fed, the meter body 2 is left as it is and the measuring direction of the meter unit 3 is changed. In addition, when gas supply has already started, after closing valve devices (both not shown) provided in the upstream pipe and the downstream pipe of the turbine type flow meter 1, the measurement direction of the meter unit 3 is measured. To change.

Then, as shown in FIG. 5, first, the lubricating oil in the oil sump chamber 16 is drained from the drain valve 30, and then the drain valve 30 is removed from the lower portion 2f of the meter body 2. Then, the bolt 25 is loosened and the lid 24 is attached to the meter body 2
And the meter portion 3 is pulled upward from the recess 2a of the meter body 2. In addition, the meter unit 3 is a lid 2
4 may be integrally removed, or may be pulled up from the recess 2a after the lid 24 is removed.

Next, as shown in FIG. 6, the direction of the meter unit 3 is changed by 180 degrees so that the measuring direction of the meter unit 3 is opposite to the mounting direction of FIG. That is,
The direction in which the turbine rotor 11 faces the cone member 5 in the Xb direction is set.

The meter unit 3 remains in this state and the meter body 2
Both ends 9b, 9c of the tubular portion 9 are lowered into the recess 2a of the
Is fitted into the recess 2a. In the meter unit 3, the distance from the axis O to both end faces 9b and 9c is La =
Since it is equal to Lb, it can be mounted in the recess 2a of the meter body 2 without any trouble even if the measurement direction is reversed.

At this time, a step may occur between the flow channel 2c and the flow channel 10 in the meter section 3 due to a processing error or the like. However, since the tapered inclined surface (step absorption portion) 9a is provided at the upstream end of the tubular portion 9, the gas flow from the flow passage 2c is guided to the inclined surface 9a. 1
It reaches 0.

Therefore, even if the direction of the meter unit 3 is reversed, it is possible to prevent the flow of gas from being disturbed and the accuracy of flow rate measurement from being lowered.

Further, the support plate 21 and the lid 24 are formed so as to be symmetrical with respect to the axis O, and the screw holes 21a of the support plate 21, the holes 24b of the lid 24, the holes 7a of the column 7, and the casing are formed. Since the upper openings 6a of 6 are arranged coaxially with the axis O, respectively, the sensor holding member 19 and the lid 2 are provided.
Even when 4 and the like are separated from the meter unit 3 and the measurement direction of the meter unit 3 is reversed, the insertion position of the sensor holding member 19 does not shift during assembly and the sensor holding member 19 is positioned on the axis O. Can be attached to.

After the lid 24 is fixed to the meter body 2 by tightening the bolts 25, the drain valve 30 is attached to the lower portion 2f of the meter body 2. At that time, since the insertion hole 2g and the insertion hole 8a of the meter body 2 are also formed coaxially with the axis O, even when the measuring direction of the meter portion 3 is reversed, the insertion portion 30b can be inserted without any trouble. It can be inserted into the hole 2g.

After mounting the drain valve 30 in this manner, lubricating oil is supplied to the oil sump chamber 16 of the casing 6.
Then, the valve devices provided in the upstream pipe and the downstream pipe of the turbine type flow meter 1 are opened to allow the gas to be supplied.

In this case, the right side of the turbine type flow meter 41 is the upstream pipe and the left side is the downstream pipe, and the gas as the fluid to be measured flows in the Xa direction, and therefore flows into the second flow path 2c from the right upstream pipe. Then, it is guided to the blades 11b of the turbine rotor 11 by the second cone member 5, passes through the flow passage 10, and flows from the first flow passage 2b to the downstream pipe. Therefore, the turbine rotor 11 rotates at a rotation speed proportional to the flow rate of the flow path 10. The rotation of the turbine rotor 11 is detected by the magnetic sensor 17, and the flow rate calculation unit (not shown) calculates the flow rate measurement value.

As described above, even when the measurement direction has to be reversed after the turbine type flow meter 41 is installed in the middle of the piping, the meter body 2 fixed to the piping is left as it is and the meter portion having the turbine rotor 11 is provided. Since only 3 can be removed from the meter body 2 and inverted,
It is possible to reverse the measurement direction with less labor than to remove the entire turbine type flow meter from the pipe and invert the same as in the conventional case, the working time is shortened, and the measurement direction can be easily changed.

In the above embodiment, the turbine type flow meter is given as an example, but the present invention is not limited to this, and the present invention can be applied to other types of flow meters (for example, positive displacement type flow meters).

Further, in the above-mentioned embodiment, the flow meter for measuring the flow rate of city gas has been described, but the present invention is not limited to this and can be applied to a flow meter for measuring the flow rate of other gas or liquid. Needless to say.

Further, in the above embodiment, the inclined surface 9a is provided only at the upstream end of the tubular portion 9, but the present invention is not limited to this, and the inclined surface functioning as a step absorbing portion is also provided at the downstream end. You may do it.

[0068]

As described above, according to the first aspect of the present invention, the fluid to be measured from the upstream flow passage is guided to the flow passage in the frame portion.
A tapered sloped surface was provided on the upstream end of the frame.
And the direction that intersects the meter part with the extension direction of the upstream and downstream flow paths.
When mounted in the recess of the meter mounting portions from the measured fluid Te
The measurement flow can be smoothly maintained in the flow path in the frame along the tapered slope , and the measurement accuracy can be maintained. Therefore, it is possible to prevent the measurement accuracy from decreasing even if the meter unit is replaced,
It is possible to shorten the work time when performing inspection or repair. Furthermore , the flow of the fluid to be measured supplied to the rotating body can be stabilized over the entire circumference of the flow path, and the rotating body can be rotated at a rotational speed proportional to the flow rate of the fluid to be measured to ensure measurement accuracy. .

[0069]

According to claim 2 , the upstream end of the rotating body is
The inner diameter of the flow path of the frame portion where the surface is located is
Since the diameter is also large, the fluid to be measured is located on the outer circumference of the rotating body.
Smoothly flows into the flow path inside the frame along the inclined surface to be placed,
Measurement accuracy can be maintained.

According to the third aspect of the invention, the meter unit can be removably mounted on the meter mounting unit so that the flow rate measuring direction is the forward or reverse direction, and the fluid to be measured is rotated by the step absorbing unit. In order to absorb the level difference in the flow path introduced to the body, remove the meter part only from the meter mounting part of the housing while the housing is connected in the middle of the piping, reverse the direction of the meter part, or replace only the meter part. However, the flow is not disturbed and the measurement accuracy can be maintained. Further, since the direction of the meter part can be reversed by removing only the meter part from the meter mounting part of the housing while the housing is connected in the middle of piping, it is possible to remove the entire flow meter from the pipe and invert it as in the conventional case. However, the measuring direction can be reversed with a small amount of labor, the working time can be shortened, and the measuring direction can be easily changed.

[Brief description of drawings]

FIG. 1 is a vertical sectional view of a turbine type flow meter applied to a first embodiment of a flow meter according to the present invention.

FIG. 2 is an enlarged vertical sectional view of a main part of the present invention.

FIG. 3 is an enlarged vertical sectional view of a mounted state of a liquid level setting pipe.

FIG. 4 is a vertical sectional view of a turbine type flow meter applied to a second embodiment of the flow meter according to the present invention.

FIG. 5 is a vertical cross-sectional view for explaining a work process of removing the meter unit.

FIG. 6 is a vertical cross-sectional view for explaining a state in which the meter unit is inverted.

FIG. 7 is a vertical cross-sectional view showing a state in which an inverted meter unit is attached to a meter body.

[Explanation of symbols]

1,41 Turbine type flow meter 2 meter body 3 meters 4 First cone member 5 Second cone member 6 casing 9 Cylindrical part 9a inclined surface 10 channels 11 turbine rotor 12 rotation axes 13, 14 bearings 17 Magnetic sensor 18 magnets 19 Sensor holding member 31 Liquid level setting pipe

─────────────────────────────────────────────────── ─── Continued Front Page (72) Hidenori Wakabayashi 1-6-3 Fujimi, Kawasaki-ku, Kawasaki-shi, Kanagawa Tokiko Co., Ltd. (72) Kazutaka Suzuki 1-6 Fujimi, Kawasaki-ku, Kawasaki-shi, Kanagawa No. 3 Tokiko Co., Ltd. (72) Inventor Koji Koike 1-3-6 Fujimi, Kawasaki-ku, Kawasaki-shi, Kanagawa Tokiko Co., Ltd. (56) Reference JP-A-6-201418 (JP, A) −157825 (JP, U) S. 63-19772 (JP, Y1) (58) Fields surveyed (Int.Cl. ⁷ , DB name) G01F 1/10

Claims (3)

(57) [Claims] 1. A meter mounting portion is formed at a central portion of the meter mounting portion.
A flow with a smaller diameter than the meter mounting part is provided on the upstream and downstream sides of the meter mounting part.
A housing having a passage formed therein,Provided in the meter mounting part and formed in the housing
A recess formed so as to intersect the formed flow path, Cone member provided in the meter mounting portion of the housing
When, It rotates according to the flow rate of the fluid to be measured downstream of the cone member.
Rotating body, A supporting portion that rotatably supports the rotating body, and
The upstream / downstream side flow extending so as to cover the outer periphery of the rotating body
A frame portion forming a flow path communicating with the passage,Above and below
From the direction that intersects the extension direction of the flow-side channelWearing the meter
DepartmentIn the recessInstalledRuMeter part, The fluid to be measured from the upstream channel is guided to the channel in the frame.
Is provided at the upstream end of the frame so that the upstream flow
Step absorbing portion for absorbing the step between the passage and the flow path in the frame portion
When, Becomes The step absorbing portion is provided in the flow path formed in the tubular shape of the frame portion.
Is a tapered inclined surface provided on the entire circumference of the side, and
The inner diameter of the flow path at the upstream end of the inclined surface is the same as the upstream flow.
Formed to be larger than the inner diameter of the passageCharacterized by
And a flow meter. 2. The upstream end surface of the rotating body is located.
The inner diameter of the frame channel is larger than that of the upstream channel.
The flowmeter according to claim 1 , characterized in that: 3.A flow path through which the fluid to be measured flows is formed inside.
And a meter mounting portion was formed so as to intersect with the flow path.
Housing, Inside the flow path formed by sandwiching the meter mounting part of the housing
Is installed on the meter, and the fluid flowing in the flow path is attached to the meter.
A pair of symmetrically provided cone members to guide the Rotate between the pair of cone members according to the flow rate of the fluid to be measured.
A rotating body that rolls, A supporting portion that rotatably supports the rotating body, and
The upstream / downstream side flow extending so as to cover the outer periphery of the rotating body
A frame portion forming a flow path communicating with the passage,
Check that the flow rate measurement direction is normal or reverse on the mounting part.
Detachable A meter part that can be worn, In order to guide the fluid to be measured to the flow path in the frame part,
The measurement target fluid is provided between both ends and the meter section.
Step that absorbs the step in the middle of the flow path where is guided to the rotating body
Absorption part,Becomes The step absorbing portion is provided in the flow path formed in the tubular shape of the frame portion.
Is a tapered inclined surface provided on the entire circumference of the
The fluid to be measured from the upstream side channel is applied to the tapered inclined surface.
Leading to the flow path inside the frame A flow meter characterized in that.