JP3392617B2 - Conduit with throttle - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION [0001] BACKGROUND OF THE INVENTION 1. Field of the Invention
Suitable for measuring the flow rate of the fluid to be measured in piping such as
The present invention relates to a pipe with a ridge. [0002] 2. Description of the Related Art Conventionally, a flow to be measured in a pipeline of a plant or the like has been known.
Flow meters based on various principles are used to measure body flow.
Have been. 3 to 5 show flow rate measurement of a fluid to be measured in a pipeline.
Shows a conventional pipe with a throttle that constitutes a flow meter that performs
It is sectional drawing. The conduit with a throttle shown in FIG.
Is configured in the pipeline to enable flow rate measurement,
In addition, the pipe with the throttle shown in FIG.
The configuration shown in FIG. 5 enables the flow rate measurement.
Restricted line allows venturi-type flow measurement
Configuration. [0003] In the pipeline with a throttle shown in FIG.
2 is a pipeline, 1a is a flange formed at an end of the pipeline 1.
is there. 1b is a conduction hole formed inside the flange 1a.
One end is open to the inner surface of the pipeline 1 and the other end is
Open to the peripheral side surface of the nozzle 1a and send the pressure in the pipeline 1 to the differential pressure gauge 4.
It is in communication with a conduit 5 for guiding. 2a is the end of the pipeline 2
It is a flange formed in. 2b is inside the flange 2a
One end of which is connected to the inner surface of the pipe 2
It is open and the other end is open on the peripheral side of the flange 2a.
It is in communication with a conduit 6 for guiding the pressure in the line 2 to the pressure gauge 4
You. Flange 1a and flange 2a have a predetermined gap
Face to face. 3 is the flange 1a of the pipe 1 and the pipe 2
A diaphragm plate disposed in a gap with the flange 2a;
An orifice 3a is formed at the center. Aperture plate 3
Is between the flange 1a of the pipeline 1 and the flange 2a of the pipeline 2.
In the gap, through a gasket to prevent leakage of the fluid to be measured
It is arranged. [0004] The differential pressure gauge 4 includes a conductive hole 1b and a conductive hole 2b.
The pressure in the pipeline 1 on the upstream side of the throttle plate 3 and the pipeline 2 on the downstream side
The differential pressure is detected by taking in the internal pressure. [0005] Further, in a pipeline with a throttle shown in FIG.
11 is a pipe, and 11a is formed on the inner surface of the pipe 11.
It is a locking part. 12 is the inside of the pipe line 11 by the locking portion 11a.
The aperture member 12a fixed to the surface is
The configured flow nozzle, 13 is a ring-shaped gasket
It is. 14 and 15 are conduction holes. The conduction hole 14 is
Has an opening at the inner surface of the conduit 11 on the upstream side of the throttle member 12.
The other end has a pressure difference in the pipeline 11 on the upstream side of the throttle member 12.
It is in communication with a conduit 17 for leading to a manometer 16. Conduction hole
15 is one end of which is inside the conduit 11 on the downstream side of the throttle member 12.
Surface, and the other end is in the pipe line 11 on the downstream side of the throttle member 12.
Is connected to a conduit 18 for conducting the pressure of
You. [0006] The differential pressure gauge 16 includes a through hole 14 and a through hole 15.
From the pressure in the pipeline 11 on the upstream side of the throttle member 12 and the throttle portion
And the pressure in the pipeline 11 on the downstream side of the material 12
Detect differential pressure. [0007] Further, in a pipeline with a throttle shown in FIG.
And 21 is a pipe, 22 is an inner diameter smaller than the inner diameter of the pipe 21
The narrowed portion 24 is formed on the outer peripheral surface of the pipeline 21.
Flange 25 is formed on the downstream side of the constricted portion 22.
It is a flange. 26 and 27 are conduction holes. Conduction hole
Reference numeral 26 denotes an inner surface of the pipe 21 whose one end is on the upstream side of the throttle portion 22.
And the other end guides the pressure in the pipe line 21 to the differential pressure gauge 29.
To a conduit 28 for communication. The conduction hole 27 is
One end is open to the diaphragm 22 and the other end is taken from the diaphragm 22.
Communicates with conduit 30 for guiding the output pressure to differential pressure gauge 29
ing. The differential pressure gauge 29 is connected to the throttle 2
Pressure drawn out from the pipe line 21 on the upstream side of
7 to detect the difference from the pressure taken out of the throttle section 22.
You. [0009] In the pipeline with a throttle shown in these figures,
Has characteristics shown in the following equations (1) and (2). [0010] (Equation 1) [0011] (Equation 2) In equation (1), the flow rate Q changes to Q '
Then, the generated differential pressure △ P becomes △ P ’represented by the following equation (3).
And the ratio between the flow rate Q 'and the flow rate Q is squared to obtain an exponential function
Amplified part is formed, so a throttle section is formed in the pipeline
Pressure upstream and downstream of the throttle, or
Due to the pressure difference between the pressure on the flow side and the pressure
Change the flow rate by measuring the flow rate or by changing the differential pressure
Can be measured. [0013] (Equation 3) Each of the tubes with a throttle shown in FIGS.
The characteristics of the road are as shown in FIGS. 4 and 5 for the constant K1.
The pipe with the constricted section shown in FIG.
In the road, it is larger than that of the pipe with a throttle shown in FIGS. 4 and 5.
small. Regarding the constant K2, the pipe with the throttle in FIG.
The pipeline with the throttle in FIG. 4 and the pipeline with the throttle in FIG.
There is a relationship that gets easier. In addition, each of these conduits with a throttle
It is preferable that the constant K1 is large, and the constant K2
It is desirable that is smaller. [0015] SUMMARY OF THE INVENTION A conventional conduit with a throttle portion
Is constructed as described above, and is also shown in equation (3).
As described above, the fluctuation of the flow rate Q is amplified as the fluctuation of the differential pressure.
Appear. Therefore, large load fluctuations and seasonal demand
If the flow rate fluctuates significantly due to fluctuations, the generated differential pressure △ P or permanent
Pressure loss P. L will have a big change,
If the flow rate range changes three times, the generated differential pressure ΔP becomes nine times
Become. Permanent pressure loss L also increases in proportion to the generated differential pressure ΔP
And the permanent pressure drop P. L increase is energy loss
Becomes Conversely, when the flow range changes to 1/3,
Raw differential pressure ΔP becomes 1/9 times, greatly affecting measurement accuracy
Will be. To cope with such a situation,
Usually, the orifice 3a of the diaphragm plate 3 shown in FIG.
The flow nozzle 12a of the throttle member 12 shown in FIG.
The flow rate Q is adjusted by changing the hole diameter of the throttle unit 22. The orifice 3a of the diaphragm plate 3 shown in FIG.
In the change, the diaphragm plate 3 is removed from the gap between the pipes 1 and 2.
Removed to a throttle plate with orifices of different hole diameters
Will be replaced. However, such an orifice
4 and 5 show the characteristics of a pipe with a constricted section using a disk.
The constant K1 is about 60% of that of the
And the constant K2 is large, so the degree of freedom of flow adjustment is small.
Permanent pressure loss L also becomes a large value.
There was a problem that the energy loss also increased. Also, the pipeline with the throttle shown in FIGS. 4 and 5
Now, the flow nozzle 12a of the throttle member 12 and the throttle section 22
It is impossible to change only the pipe, replace the entire pipeline with the throttle
There was a problem to be done. Further, in the conduit with a throttle shown in FIG.
From the shape of the flow nozzle, the direction of the flow of the fluid to be measured in the pipeline
There is a problem that the direction is restricted to the flow direction from left to right.
Was. Further, in the conduit with a throttle shown in FIG.
Mounting position of through holes 26 and 27 and length of conduits 28 and 30
Changes in the flow direction of the fluid to be measured in the pipeline
And it was not easy to deal with. The present invention solves the above problems.
The flow direction of the fluid to be measured in the pipeline
Control of the fluid to be measured in the pipeline
Easy and economical realization for accurate flow measurement
It is intended to obtain a pipeline with a constricted portion. [0022] Means for Solving the Problems According to the invention of claim 1
The pipe with the constricted section is placed in a pipe formed in a substantially cylindrical shape.
The interpolated inner peripheral cross-sectional shape is reduced to a curve that forms a substantially elliptical shape.
An aperture member that constitutes theThe throttle member is one of the pipes
A first member inserted through the opening of
The first member and the inner surface of the conduit inserted through the opening of
And a second member fitted in the gap formed by
Connecting the first member and the second member to the tube
A fixing member for detachably fixing in the roadBe prepared
It is a thing. [0023] [0024] BEST MODE FOR CARRYING OUT THE INVENTIONTo understand
Reference Example 1Will be described.Reference example 1. Figure 1 shows thisReference example1 is a sectional view showing a configuration of a pipeline with a constricted portion.
FIG. In the figure, 51 is formed in a substantially cylindrical shape.
Pipe 52, 52 is one pipe opening of the pipe 51, 53 is a pipe
The other channel opening of the channel 51, 54 is the channel opening of the channel 51
The flange formed around the portion 52, 55 is the flange 5
4, a second conduit inside / outside conductive hole formed in
One opening portion of the inside / outside conducting hole 55 of the second pipe, 57 is the second opening.
This is the other opening of the inside / outside conduit hole 55. Opening 56
Is open on the inner surface of the conduit 51, and the opening 57 is
It is open on the peripheral side surface of the flange 54. Inner surface of opening 57
Is formed with a screw portion. By this screw part,
One of a pair of conduits connected to a differential pressure gauge
Can be connected to the opening 57. Reference numeral 58 denotes a pipe formed around the pipe opening 53 of the pipe 51.
The formed flange 59 is formed in the flange 58
The inside and outside of the second conduit, 60 is the inside and outside of the second conduit
One opening of the hole 59, 61 is the second conduit inside / outside conducting hole 5
9 is the other opening. Opening 60 is the inner surface of conduit 51
The opening 61 is located on the peripheral side of the flange 58.
Open to the surface. A thread is formed on the inner surface of the opening 61
Have been. With this screw, the one connected to the differential pressure gauge
Connect the other end of the pair of conduits to opening 61
it can. Reference numeral 70 denotes a cross section formed on the outer peripheral surface of the conduit 51.
Is a trapezoidal diaphragm holding portion, and 77 is formed on the inner surface of the pipeline 51.
Convex locking part, and a part of the cross-sectional shape is substantially elliptical.
It is constituted by the resulting curves. 72 is a cap screw
(Fixing member), the tip of which is the locking portion 77
The aperture holder 70 is formed so as to face at a predetermined angle to
It is screwed with the formed female thread, and when it is screwed in,
The tip of the set screw 72 protrudes from the inner surface of the conduit 51.
Also, the base of the screw forming portion of the cap screw 72 is
Maintains airtightness when screwed with the female thread part of the holding part 70
Can be fitted with an airtight ring or packing
It is. In addition, airtightness can be maintained by the sealing material.
It is possible. Reference numeral 74 denotes a first member formed on the diaphragm holding portion 70.
The inside / outside conduit hole 75 is one of the first inside / outside conduit hole 74.
Opening, and a screw portion is formed inside. No.
The other opening of the inside / outside conductive hole 74 of the first pipe is inside the pipe 51.
Formed on the surface. Reference numeral 101 denotes a diaphragm member, and 101a denotes a diaphragm member 1.
Reference numeral 01 denotes an aperture formed by the inner surface. This aperture
The cross section of 101a is formed by a curve forming a substantially ellipse.
Have been. 101b is in contact with the tip of the cap screw 72
It is a concave part. The concave portion 101b has an inner diameter of the conduit 51.
A squeeze formed to an outer diameter with a specified tolerance to the dimension
It is provided on the outer peripheral surface of the connecting member 101. Also, this concave
The portion 101b is provided on a female thread portion formed on the aperture holding portion 70.
Pressed by tip of cap screw 72 screwed in
It has a squeezing surface 101c. This narrowing surface 1
01c is a plane perpendicular to the direction in which the cap screw 72 enters.
It is formed so that it becomes. 101e is the aperture member 10
1 is a conduction hole. This conduction hole 101e is
Connected to the first conduit inside / outside conducting hole 74 to the throttle portion 101a
Open and communicate the first conduit inside and outside through hole 74 into the conduit 51
Let me. Reference numeral 90 denotes a gasket for maintaining airtightness.
It is. The gasket 90 includes the locking portion 77 and the throttle member 10.
It is arranged at the point of contact with 1. Next, the operation will be described. With this throttle
The pipeline is located between pipelines (not shown) and has openings
57, 61 and 75 are connected to a differential pressure gauge as necessary,
Configure a flow meter to measure the flow rate of the fluid supplied by the pipeline.
To achieve. In this case, a flange 5 is provided around the end of the pipe.
Flanges of the same dimensions as 4, 58 are constructed.
The flange and the flanges 54 and 58 of the conduit with the throttle are connected
Butt through a sket and fix with bolts. The flow rate in the pipeline changes, and
If it becomes necessary to change the hole diameter, remove the bolt
Then, the pipe with the throttle is removed from the pipe.
Then, turn the cap screw 72 counterclockwise to
The tip of the cap screw 72 has receded from the inner surface of the conduit 51.
First, the diaphragm member 101 is connected to the pipe opening 5.
2 and is taken out from the conduit opening 52. This
In the case of, the restricting member 101 is connected to the conduit opening 52 of the conduit 51.
If you prepare a jig for taking out
It can be easily taken out. Next, the throttle member 101 of the new standard is connected to the pipeline.
51 through the pipe opening 52 to be inserted into the pipe opening 53
In the direction between the first conduit inside / outside conduction hole 74 and the conduction hole 101e.
While performing the alignment, the diaphragm member 101 is
Push until it touches. In this case, the restricting member 101 is
If you prepare a jig for pushing it into the road 51,
Easy and accurate drawing of the throttle member 101 into the conduit 51 by using a jig
It is possible to push into. Also, at this time,
The cut 90 is located at the contact point between the throttle member 101 and the locking portion 77.
Make it fit. Next, remove the cap screw 72
It is screwed in and the narrowed surface 1 of the concave portion 101b is formed by its tip.
01c to fix the throttle member 101 in the conduit 51
I do. As described above,Reference exampleBy one
For example, a diaphragm having new characteristics only by replacing the diaphragm member 101
It is possible to easily form a pipe with a ridge. This result
As a result, there is no need to replace the entire pipeline with
There is an advantageous effect on the strike. Also, different characteristics
If only a plurality of types of aperture members 101 are prepared,
Since it is good, there is an effect that parts management becomes easy. Further
And a throttle member 10 made of a material having excellent corrosion resistance.
By using 1, the corrosion resistance depends on the properties of the fluid in the pipeline
Can be easily exchanged for a superior crest portion. Further, the cross section of the aperture portion 101a is substantially elliptical.
Since it is constituted by the curve that constitutes
The aperture formed by the curved surface is a constant K1 shown in equation (1).
Is the maximum value, and the constant K2 shown in the equation (2) is the minimum value.
Optimal flow rate measurement conditions are economical
And can be easily realized. Further, the aperture member 101 is replaced to replace the aperture section.
By increasing the diameter of the hole 101a, an excessively generated differential pressure ΔP
And permanent loss P. Economically and easily prevent the occurrence of L
And conversely, reduce the hole diameter of the throttle portion 101a.
The flow rate with high accuracy because it can secure the appropriate differential pressure ΔP
Measurement becomes possible. Further, on both sides of the opening 75, the openings 57,
61 is provided, and the transfer of the fluid in the pipeline with the throttle is provided.
Open the high-pressure side opening that is connected to the differential pressure gauge according to the feeding direction.
By switching to the mouth 57 or the opening 61, the fluid
Direction is right-to-left or left-to-right
Can respond to it. In addition, the throttle unit 101a is provided in the pipeline.
Has the same curved surface shape in any fluid transfer direction
Therefore, the characteristic of the throttle unit 101a is
Accurate flow measurement without changing according to direction
Becomes possible. Further, the fluid in the conduit with the constricted portion flows from the left.
When flowing to the right, the pressure due to this fluid flow is reduced
Acting on the portion 101a.
Direction of pressing 101a against locking portion 77 and drawing portion 101
a in the direction pressing the inner surface of the conduit 51,
Looseness or displacement of the throttle part 101a with respect to the inner surface of the conduit 51
Can be effectively prevented. Also, when fluid flows from right to left
Also in this case, the pressure due to the flow of the fluid is applied to the throttle portion 101a.
Acts, but moves the diaphragm 101a to the left
The force to be applied is suppressed by the locking portion 77, and
The fluid pressure acting on the curved surface of the throttle member is small.
Constriction portion 1 that may be generated on the inner surface of conduit 51
01a can be effectively prevented from being loosened or misaligned. Embodiment1. FIG. 2 shows this embodiment.1Shows the configuration of a pipeline with a throttle
FIG. In FIG. 2, the same as or equivalent to FIG.
Portions are given the same reference numerals and description thereof is omitted. In the figure
Here, reference numeral 71 denotes a position where the aperture holding portion 70 is formed.
It is a convex locking portion formed on the inner surface of the conduit 51. 72
And 73 are cap screws (fixing members), and their tip portions
Faces at a predetermined angle in the direction of the locking portion 71.
Into the female thread formed on the aperture holding section 70
When screwed in, the tips of the cap screws 72 and 73
It protrudes from the inner surface of the conduit 51. In addition, these cap
Airtightness is maintained at the bases of the thread forming portions of the dies 72 and 73.
It is possible to attach an airtight ring and packing for
is there. In addition, airtightness can be maintained by sealing material.
Noh. The first conduit inside / outside conducting hole 74 is formed with the opening 75.
Between the opening formed in the inner peripheral surface 71a of the locking portion 71
Communicating. Reference numeral 81 denotes a first throttle member (first member), 81
a is an inner peripheral cross-sectional shape constituted by a curve forming a substantially elliptical shape.
The tip of the cap screw 72 abuts on the narrowed portion 81b.
Recess. The concave portion 81b has an inner diameter of the conduit 51.
A first restrictor formed to an outer diameter having a predetermined tolerance with respect to
It is provided on the outer peripheral surface of the connecting member 81. Also, this recess
81b corresponds to a female thread portion formed in the aperture holding portion 70.
Pressed by the tip of the screwed cap screw 72
It has a narrowing surface 81c. This narrowing surface 81c
Is a plane perpendicular to the direction in which the cap screw 72 enters.
It is formed as follows. 81d is the edge of the locking portion 71
And the outer peripheral surface of the first throttle member 81.
Is formed. 81e is provided on the first throttle member 81.
It is a conduction hole that has been removed. This conduction hole 81e is located inside the first conduit.
It is connected to the outer conduction hole 74 and opens to the throttle portion 81a.
The inside / outside conduit hole 74 communicates with the inside of the conduit 51. Reference numeral 82 denotes a second throttle member (second member).
You. The first throttle member 81 is connected to the pipe 51 from the pipe opening 52.
When inserted and arranged as shown in FIG.
Between the end of the material 81 and the inner surface of the conduit 51
A gap having a dimension corresponding to the height is generated, and the second throttle member 82
It is inserted from the conduit opening 53 of the conduit 51 and fits into the gap.
Are combined, and the cross section is constituted by a curve that constitutes a substantially elliptical
This is a member for interpolating the narrowed portion 81a. others
The second throttle member 82 is fitted in the gap,
Inner circumference cut made of a curve constituting a substantially elliptical shape of one stop member 81
It has a cross section consisting of a curve that is continuous with the surface shape. Ma
In addition, on the outer peripheral surface of the second throttle member 82, the first throttle member 81
A concave portion 82b similar to the concave portion 81b is formed.
The concave portion 82b is formed with a female screw portion formed in the aperture holding portion 70.
Against the tip of the cap screw 73
It has a pressing surface to be pressed. This focusing surface is
So that it is perpendicular to the direction of entry of the set screw 73.
Has been established. Gases 91 and 92 are used to maintain airtightness.
Kett. Gasket 91 is the edge of locking portion 71
And the stepped portion 81d of the first throttle member 81.
Is placed. The gasket 92 is an edge of the locking portion 71
Between the outer peripheral surface of the first throttle member 81 and the second throttle member 82.
It is located at the contact point. Next, the operation will be described. With this throttle
The pipeline is located between pipelines (not shown) and has openings
57, 61 and 75 are connected to a differential pressure gauge as necessary,
Can measure the flow rate of the fluid supplied by the pipeline
You. In this case, a flange 5 is provided around the end of the pipe.
Flanges of the same dimensions as 4, 58 are constructed.
The flange and the flanges 54 and 58 of the conduit with the throttle are connected
Butt through a sket and fix with bolts. When the flow rate in the pipeline changes, the throttle section 81a changes.
If necessary, remove the bolts
The pipe with the throttle is removed from the pipe. And
Turn the cap screws 72 and 73 counterclockwise to
The tips of the setscrews 72, 73 are retracted from the inner surface of the conduit 51.
First, the first throttle member 81 is opened.
Slide in the direction of the mouth 52 and take it out from the pipeline opening 52
You. Further, the second throttle member 82 is moved in the direction of the conduit opening 53.
To be taken out from the conduit opening 53. in this case,
For taking out the first throttle member 81 and the second throttle member 82
If you have a jig, take it out easily with this jig
It is possible. Next, the second throttle member 82 of the new standard is connected to the pipe.
From the channel opening 53 and the second direction in the direction of the channel opening 52.
Push the diaphragm member 82 until it comes into contact with the locking portion 71. This
In order to push the second throttle member 82 into the conduit 51,
If the jig is prepared, the second drawing member can be
82 can be easily pushed into the conduit 51.
At this time, the gasket 92 is in contact with the second throttle member 82.
It is in a state of being fitted to a contact portion with the locking portion 71.
Next, the cap screw 73 is screwed into the cap screw 73.
Press the narrowing surface of the concave portion 82b with the tip of
The throttle member 82 is fixed in the conduit 51. Next, the first throttle member 81 of the new standard is used.
Is inserted through the conduit opening 52 of the conduit 51, and is inserted into the first conduit.
While positioning the outer conduction hole 74 and the conduction hole 81e,
The stepped portion 81 d is engaged with the locking portion 71 in the direction of the conduit opening 53 from
Push until it touches. In this case, the first throttle member 81
If you prepare a jig for pushing the pipe into the pipeline 51,
This jig allows the first throttle member 81 to be easily inserted into the pipeline 51.
It is possible to press in exactly one. At this time,
The gasket 91 makes contact between the first throttle member 81 and the locking portion 71.
It is in a state of being fitted to the contact point. Next, the cap
Screw the screw 72 and narrow the recess 81b with the tip.
Pressing the cutting surface 81c to move the first throttle member 81 into the conduit 51.
Fix to. As described above, according to this embodiment,
Then, the exchange of the first throttle member 81 and the second throttle member 82 can be performed.
To easily construct a pipeline with a throttle with new characteristics.
Can be As a result, the entire pipeline with the throttle is replaced
This eliminates the need for
You. Also, a plurality of types of first throttle units having different characteristics
What is necessary is to prepare the material 81 and the second throttle member 82
Therefore, there is an effect that parts management becomes easy. In addition, corrosion resistance
The first throttle member 81 and the second
By using the throttle member 82, it is possible to respond to the properties of the fluid in the pipeline.
Can be easily replaced with a drawn part with excellent corrosion resistance.
it can. Further, the constricted portion 81a has a substantially inner cross-sectional shape.
Because it is composed of the curves that make up the ellipse,
The aperture formed by such a curved surface is the constant shown in equation (1).
K1 is the maximum value, and the constant K2 shown in equation (2) is the minimum value.
Optimum flow rate measurement conditions
Inexpensive and easy to implement. Further, a first throttle member 81 and a second throttle member
The diameter of the aperture 81a should be increased by exchanging the hole 82.
Excessive pressure difference ΔP or permanent loss P. Economical generation of L
And can be easily prevented.
Proper differential pressure ΔP can be secured by reducing the diameter
Therefore, accurate flow rate measurement becomes possible. Further, on both sides of the opening 75, the openings 57,
61 is provided, and the transfer of the fluid in the pipeline with the throttle is provided.
Open the high-pressure side opening that is connected to the differential pressure gauge according to the feeding direction.
By switching to the mouth 57 or the opening 61, the fluid
Direction is right-to-left or left-to-right
Can respond to it. In addition, the restricting portion 81a is provided for controlling the flow in the pipeline.
Have the same cross-sectional shape in any direction of transport of the body
Therefore, the characteristic of the throttle portion 81a depends on the fluid transfer direction.
Does not change depending on the fluid transfer direction
And accurate flow rate measurement is possible. Further, the fluid in the conduit with the constricted portion is
When flowing to the right, the pressure due to this fluid flow is
It acts on the diaphragm member 81 and the second diaphragm member 82.
However, the component force acting on the first throttle member 81 is the first throttle member 8
Press the first step forming portion 81d against the edge of the locking portion 71
Direction and the outer peripheral surface of the first throttle member 81 to the inner surface of the pipeline 51.
To the inner surface of the conduit 51
Looseness and displacement of the first throttle member 81 can be effectively prevented.
Also, when the fluid flows from right to left,
The pressure caused by this is applied to the first throttle member 81 and the second throttle member 82.
This component force acts on the first throttle member 81.
The direction in which the outer peripheral surface is pressed against the inner surface of the conduit 51 and the second throttle portion
Since it acts in the direction of pressing the material 82 against the locking portion 71,
First throttle member that may be formed on the inner surface of conduit 51
81 and the second throttle member 82 can be effectively prevented from loosening or shifting.
Wear. Note that this embodiment described above1Then, the first
The throttle member 81 is fixed into the pipe line 51 by the cap screw 72.
And the second throttle member 82 is attached to the cap screw 73.
Although it was fixed inside the conduit 51, one key
By using a cap screw, the first throttle member 81 and the second throttle
The member 82 may be configured to be fixed in the conduit 51.
No. [0050] As described above, according to the first aspect of the present invention,
IfA first member inserted through one opening of the conduit
And inserted through the other opening of the conduit, and the first
A second fitting which fits into a gap formed between the member and the inner surface of the conduit
And the inner peripheral cross-sectional shape forms a substantially elliptical
A narrowed portion formed of a curved line, the first member and the second member.
A fixing member for detachably fixing the member and the pipe in the conduit.
As it is configured to have
Accurately match the curve that constitutes the ellipse,
The shape of the throttle should be the same for the fluid transfer direction.
Possible depending on the flow direction of the fluid to be measured in the pipeline.
Characteristics can be ensured without
To eliminate restrictions on the flow direction of the fluid to be measured in the pipeline.
Can be. Also, place only the throttle member in the conduit,
Can be easily attached and detached without causing displacement
Easy and economical adjustment of the flow rate of the fluid to be measured in the pipeline
And the flow direction of the fluid to be measured in the pipe depends on the flow direction.
The spirit that never getsThe effect of enabling accurate flow measurement
is there. [0051]

BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 is a cross-sectional view showing a configuration of a diaphragm portion with conduit according Example 1 of the present invention. FIG. 2 is a cross-sectional view illustrating a configuration of a conduit with a throttle according to the first embodiment of the present invention. FIG. 3 is a cross-sectional view showing a configuration of a conventional conduit with a throttle. FIG. 4 is a cross-sectional view showing a configuration of a conventional conduit with a throttle. FIG. 5 is a cross-sectional view showing a configuration of a conventional pipeline with a throttle. DESCRIPTION OF SYMBOLS 51 Pipe 52, 53 Pipe opening 55, 59 Second pipe inside / outside conductive hole 72, 73 Cap screw (fixing member) 74 First pipe inside / outside conductive hole 81 First throttle member ( (First member) 82 second throttle member (second member) 101 throttle member 101a throttle portion 101e conduction hole

Claims (1)

(57) [Claims 1] A throttle portion formed in a pipeline, first inner and outer passage holes for flow rate measurement formed in the throttle portion, and portions other than the throttle portion. A conduit with a constricted portion provided with a second conduit inside and outside the flow path for measuring flow rate formed in the pipe, wherein the inner peripheral cross-sectional shape is inserted into the substantially cylindrical conduit and has a substantially elliptical cross-sectional shape. A diaphragm member that forms a diaphragm portion in a curved line, and a diaphragm member that is fitted through one opening of the pipeline.
1 member and the first member inserted through the other opening of the conduit,
And a second fitting that fits into a gap formed by
The fixing member connects the first member and the second member to the tube.
A conduit with a throttle , which is detachably fixed in a road.