JPH05296808A - Ultrasonic flowmeter - Google Patents

Abstract

(57) [Abstract] [Purpose] To prevent the deformation of the lining layer in the duct of the ultrasonic flowmeter. [Structure] The lining layer 2 is formed on the inner surface of the conduit 1.
Reinforcing members 10 and 11 are fitted into the mounting holes 3 and 4 on the side wall of the pipeline 1, and the bottom portions 10b and 11b of the reinforcing members 10 and 11 are lined with the lining layer 2.
Then, the flange portions 10a, 11a are engaged with the pipe line 1 and fixed. The ultrasonic transmitter 5 and the ultrasonic receiver 6 are fitted to the reinforcing members 10 and 11, and the transmitter 5a and the receiver 6a.
Is pressure-bonded to the lining layer 2 via the bonding materials 7 and 8. Since the conduit 1 receives the pressing force for pressing the lining layer 2 by the transmitter 5a and the receiver 6a, the lining layer 2 is not deformed by this pressing force. Further, since the lining layer 2 is connected and reinforced by the reinforcing members 10 and 11, the lining layer 2 does not separate from the conduit 1.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an improved ultrasonic flowmeter for measuring the flow rate of a fluid in a pipe by using ultrasonic waves.

[0002]

2. Description of the Related Art An ultrasonic flowmeter transmits an ultrasonic signal into a pipe, propagates it in a fluid in the pipe, and detects the modulation of the ultrasonic signal due to the flow of the fluid. The flow rate of the fluid is measured.

As a flow meter using ultrasonic waves, for example,
A vortex generator is installed in the pipeline, and the flow rate of the fluid in the pipeline is measured by detecting the Karman vortex generated on the downstream side of the vortex generator by the flow of the fluid in the pipeline using ultrasonic waves. Vortex flow meters are known.

In addition, a chemically stable substance (for example, polyfluoroalkyl) is attached to the fluid-contacting portion of the inner surface of the pipe for the purpose of measuring the flow rate of a clean fluid such as ultrapure water, foods, chemicals, etc. or a corrosive fluid. There is an ultrasonic flowmeter in which a lining layer made of a vinyl resin (PFA), a polytetrafluoroethylene resin (PTFE), or other fluororesin) is formed.

In the conventional ultrasonic flowmeter of this type, as shown in, for example, FIGS. 7 and 8, a lining layer 2 is formed on a fluid-contacting portion on the inner surface of a conduit 1. On the side wall of pipeline 1,
A pair of mounting holes 3 and 4 penetrating in the radial direction are provided, and the mounting holes 3 and 4 respectively include an ultrasonic transmitter 5
And the ultrasonic receiver 6 is fitted. The ultrasonic wave transmitter 5 and the ultrasonic wave receiver 6 are respectively provided with a transmitting portion at the tip thereof.
5a and the receiving portion 6a are adhered to the lining layer 2 via the bonding materials 7 and 8.

Further, the lining layer 2 is prevented from peeling from the pipe line 1 due to expansion due to the fluid in the pipe line 1 or heat from the outside and vibration, pressure fluctuation, etc. generated when the fluid flows in the pipe line 1. In order to do so, there is one in which a reinforcing plate 9 such as a cylindrical punching metal is embedded inside the lining layer 2. The reinforcing plate 9 is provided with cutouts 9a and 9b at positions facing the ultrasonic wave transmitter 5 and the ultrasonic wave receiver 6 so as not to hinder the propagation of the ultrasonic wave signal.

With this configuration, the ultrasonic transmitter 5 and the ultrasonic receiver 6 transmit and receive ultrasonic signals via the bonding materials 7 and 8 and the lining layer 2.

[0008]

By the way, ultrasonic waves are
The transmittance becomes extremely low at the boundary between the acoustic impedances that are significantly different from each other. Therefore, in the above conventional example,
Ultrasonic transmitter 5 and ultrasonic receiver 6 and lining layer 2
In order to prevent intrusion of air and other substances having a significantly different acoustic impedance, the ultrasonic wave transmitter 5 and the ultrasonic wave transmitter 5 and the ultrasonic wave generator 5 are sandwiched between the transmitting portion 5a and the receiving portion 6a and the lining layer 2. The sound wave receiver 6 is press-bonded to the lining layer 2 so that the transmission efficiency of ultrasonic waves does not decrease.

Therefore, the bonding materials 7 and 8 of the lining layer 2 are
The pressing force from the ultrasonic wave transmitter 5 and the ultrasonic wave receiver 6 always acts on the abutting part of. In addition, the coefficient of thermal expansion of the line 1, the ultrasonic transmitter 5, the ultrasonic receiver 6, and the lining layer 2 are different. Therefore, there is a problem that the pressing force is increased due to temperature change and the lining layer 2 having low strength may be deformed.

The present invention has been made in view of the above points, and provides an ultrasonic flowmeter capable of preventing deformation of the mounting portions of the ultrasonic transmitter and the ultrasonic receiver of the lining layer. With the goal.

[0011]

In order to solve the above-mentioned problems, the present invention provides a pipe having a lining layer formed on its inner peripheral surface, a mounting hole provided in a side wall of the pipe, and An ultrasonic wave transmitter and an ultrasonic wave receiver mounted in the mounting hole are provided, and the ultrasonic wave signal transmitted from the ultrasonic wave transmitter and propagated in the fluid in the pipeline is received by the ultrasonic wave receiver. In an ultrasonic flow meter that measures the flow rate of the fluid in the pipe by detecting the modulation of the ultrasonic signal due to the flow of the fluid, the ultrasonic flow meter is inserted into the mounting hole, and one side is engaged with the lining layer. The other side is provided with a reinforcing member which is engaged with the conduit.

[0012]

With this structure, the lining layer near the ultrasonic transmitter and the ultrasonic receiver is connected to the pipe by the reinforcing member and reinforced, so that the lining layer is deformed or peeled from the housing. It becomes difficult to lose.

[0013]

Embodiments of the present invention will now be described in detail with reference to the drawings. Since this embodiment is different from the conventional example shown in FIGS. 7 and 8 only in the mounting portion of the ultrasonic transmitter / receiver, the same members as those in the conventional example are designated by the same reference numerals and different parts Only will be described in detail.

The first embodiment will be described with reference to FIGS. 1 to 4. As shown in FIGS. 1 and 2, the mounting holes 3 and 4 of the pipeline 1 have flange portions 10a and 11 on the outer peripheral side of the openings.
Reinforcing members 10 and 11 each having a bottom and having a formed therein are fitted, and holes 12 and 13 for transmitting ultrasonic waves are provided in bottom portions 10b and 11b of the reinforcing members 10 and 11, respectively. The reinforcing members 10 and 11 are
The flange portions 10a and 11a are engaged with the outer peripheral surface of the pipeline 1 and fixed to the pipeline 1, and the bottom portions 10b and 11b are embedded in the lining layer 2 and fixed to the lining layer 2.
Further, as shown in FIG. 3, a plurality of holes 14 and 15 are provided on the side walls of the reinforcing members 10 and 11, and the resin forming the lining layer 2 flows into the holes 14 and 15 to reinforce the reinforcing members 10 and 11.
11 is fixed.

An ultrasonic transmitter 5 and an ultrasonic receiver 6 are fitted to the reinforcing members 10 and 11, respectively. Then, the bonding materials 7 and 8 are sandwiched between the transmitting portions 5a and 6a of the ultrasonic transmitter 5 and the ultrasonic receiver 6 and the lining layers 2a and 2b formed in the reinforcing members 10 and 11, respectively. The ultrasonic transmitter 5 and the ultrasonic receiver 6 are press-bonded to the lining layer 2.

The operation of the first embodiment constructed as above will be described below. To attach the reinforcing members 10 and 11 to the conduit 1, first, the reinforcing members 10 and 11 are inserted into the mounting holes 3 and 4 of the conduit 1.
And the reinforcing plate 9 is fitted in the pipe line 1, and then
By attaching a mold of a predetermined shape to each part of the pipeline 1 and forming the lining layer 2, the bottom part 10b, 1 together with the reinforcing plate 9
The 1b side is fixed while being embedded in the lining layer 2. Further, at this time, the resin flows into the plurality of holes 14 and 15 provided in the side walls of the reinforcing members 10 and 11 and the reinforcing members 10 and 11
Is fixed to the conduit 1.

Transmitting section of ultrasonic transmitter 5 and ultrasonic receiver 6
5a and the receiving portion 6a are lining layers with the bonding materials 7 and 8 interposed therebetween.
The ultrasonic wave transmitter 5 and the ultrasonic wave receiver 6 on the lining layer 2 are attached to the reinforcing members 1a and 2b by pressing.
It is reinforced by 0 and 11, and the pressing force is received by the bottom portions 10b and 11b of the reinforcing members 10 and 11 fixed to the conduit 1, and the ultrasonic transmitter 5 and the ultrasonic receiver 6 are reinforced. Member 10,
Since it is held at 11, the lining layer 2 is not deformed by this pressing force.

The ultrasonic wave transmitter 5 and the ultrasonic wave receiver 6 transmit and receive ultrasonic signals through the bonding materials 7 and 8 and the lining layer 2 through the holes 12 and 13 at the bottom of the reinforcing members 10 and 11. I do.

The second embodiment will be described with reference to FIG. In the second embodiment, the ultrasonic transmitter / receiver is mounted with the same configuration, and therefore only the transmitter side will be illustrated and described.

As shown in FIG. 5, a tubular reinforcing member 16 having a large diameter flange portion 16a formed at one end and a small diameter flange portion 16b formed at the other end is inserted into the mounting hole 3 of the pipe line 1. The large-diameter flange portion 16a is embedded in the lining layer 2 and fixed to the lining layer 2. A ring-shaped flange 17 is fixed to the small-diameter flange portion 16b of the reinforcing member 16 by welding or the like, and the flange 17 is engaged with the outer peripheral surface of the conduit 1 and fixed to the conduit 1.

The ultrasonic transmitter 5 is inserted through the reinforcing member 16, and is attached to the pipe line 1 by the bolt 18 in a state where the transmitting portion 5a is pressed and brought into close contact with the lining layer 2 in the reinforcing member 16.

In FIG. 5, 19 is an ultrasonic wave transmitter, 20 is an ultrasonic wave transmission circuit, and 21 is a seal member.

The operation of the second embodiment constructed as above will be described. To attach the reinforcing member 16 to the pipe line 1 and the lining layer 2, first, the reinforcing member 16 is inserted into the mounting hole 3 of the pipe line 1.
And then a mold (not shown) having a predetermined shape is attached to each part of the conduit 1 to form the lining layer 2, so that the large-diameter flange part 16a is placed in the lining layer 2. It is fixed in the embedded state, then the small diameter flange 16b
The flange 17 is fixed to the pipe 1 by welding, etc.
It is performed by abutting on the outer peripheral surface of and fixing.

The ultrasonic transmitter 5 is fixed in a state where the transmitting portion 5a thereof is pressed and brought into close contact with the lining layer 2, but the mounting portion of the transmitting portion 5a of the lining layer 2 is fixed by the reinforcing member 16 and the flange 17. Since the pipe line 1 is mechanically connected and reinforced, the lining layer 2 is pressed by the pressing force from the transmitting portion 5a.
Is not deformed or peeled off from the conduit 1.

The third embodiment will be described with reference to FIG. In the third embodiment, the ultrasonic transmitter / receiver is mounted with the same configuration, and therefore only the transmitter side will be illustrated and described.

As shown in FIG. 6, the lining layer 2 includes
A mounting hole 22 communicating with the mounting hole 3 of the pipeline 1 is provided. An ultrasonic transmitter 23 is fitted in the mounting holes 3 and 22.

The ultrasonic transmitter 23 is a PEEK that has excellent ultrasonic wave transmission characteristics and is chemically stable with respect to the fluid to be measured.
A holder 24 as a cylindrical reinforcing member made of (poly-ether-ether-ketone) resin or the like is externally mounted, and one end of the holder 24 has a flange portion that abuts the inner peripheral surface of the lining layer 2. 25 is formed, and a nut 26 that comes into contact with the outer peripheral surface of the conduit 1 as a holding member is screwed to the other end side and fixed to the conduit 1. Here, on the other end side of the holder 24, instead of the nut 26, another holding member that comes into contact with the outer peripheral surface of the conduit 1 may be attached. In this case, it is preferable that the holding member is attached to the holder 24 while the flange portion 25 is pressed against the lining layer 2. In FIG. 6, 27 is an ultrasonic transmitter and 28 is a seal member.

The operation of the third embodiment constructed as above will be described below. The ultrasonic transmitter 23 has its holder 24
Through the mounting hole 3 and the mounting hole 22, and fixed by sandwiching the side wall of the conduit 1 and the lining layer 2 with the flange portion 25 on one end side and the nut 26 screwed on the other end side. Since the holder 24 serves as a reinforcing member that connects the pipeline 1 and the lining layer 2, the pipeline 1 and the lining layer 2 are unlikely to separate. Therefore, the pipe line 1 and the lining layer 2 are prevented from peeling off due to temperature change and the like, so that the applicable temperature range of the ultrasonic flowmeter can be widened.

Further, the holder 24 of the ultrasonic transmitter 23 is directly
Since it is in contact with the fluid to be measured, the ultrasonic wave can be transmitted from the ultrasonic transmitter to the fluid to be measured efficiently and an accurate signal can be easily detected, so that the receiving circuit can be simplified.

Further, as compared with the conventional example shown in FIGS. 7 and 8, a joining material is not required and the number of parts is small, so that the number of assembling steps and the manufacturing cost can be reduced.

Although the reinforcing plate 9 is omitted in the second and third embodiments, the reinforcing plate 9 is embedded in the lining layer 2 as in the conventional example and the first embodiment. You can also

[0032]

As described in detail above, according to the ultrasonic flowmeter of the present invention, the ultrasonic transmitter and ultrasonic receiver mounting portions of the lining layer are reinforced by the reinforcing member fixed to the conduit. The deformation is prevented. As a result, the lining layer is less likely to be deformed or peeled off from the pipeline due to temperature changes or fluid pulsations, so the applicable temperature range of the ultrasonic flowmeter is widened and the ultrasonic waves caused by peeling off the lining layer from the pipeline are increased. This has an excellent effect that it is possible to prevent the occurrence of a measurement error due to a change in signal transmittance.

[Brief description of drawings]

FIG. 1 is a side sectional view of a main part of a first embodiment of the present invention.

FIG. 2 is a vertical sectional view of FIG.

3 is a side sectional view of a reinforcing member of the apparatus of FIG.

FIG. 4 is a plan view of the reinforcing member of FIG.

FIG. 5 is a side sectional view of an essential part of the second embodiment of the present invention.

FIG. 6 is a vertical cross-sectional view of the front of the main part of the third embodiment of the present invention.

FIG. 7 is a side sectional view of a main part of a conventional ultrasonic flowmeter.

FIG. 8 is a vertical cross-sectional view of FIG.

[Explanation of symbols]

 1 Pipeline 2 Lining layer 3,4,22 Mounting hole 5,23 Ultrasonic transmitter 6 Ultrasonic receiver 10,16 Reinforcing member 24 Holder (reinforcing member) 25 Flange portion 26 Nut (retaining member)

Claims (3)

[Claims] 1. A pipe having an inner peripheral surface on which a lining layer is formed, a mounting hole provided in a side wall of the pipe, and an ultrasonic transmitter and an ultrasonic receiver mounted in the mounting hole. The ultrasonic wave signal transmitted from the ultrasonic wave transmitter and propagated in the fluid in the conduit is received by the ultrasonic wave receiver, and the modulation of the ultrasonic wave signal due to the flow of the fluid is detected. In an ultrasonic flowmeter for measuring the flow rate of fluid in the conduit, a reinforcing member is provided that is inserted into the mounting hole, one side is engaged with the lining layer, and the other side is engaged with the conduit. Ultrasonic flow meter characterized by. 2. A pipe line having a lining layer formed on its inner peripheral surface, a mounting hole formed in the pipe line so as to reach the lining layer, and an ultrasonic transmitter fitted in the mounting hole. An ultrasonic wave receiver is provided, and the ultrasonic wave signal transmitted from the ultrasonic wave transmitter and propagated in the fluid in the pipeline is received by the ultrasonic wave receiver, and the ultrasonic wave is caused by the flow of the fluid. In an ultrasonic flow meter for measuring the flow rate of fluid in the pipeline by detecting modulation, one side is embedded in the lining layer and the other side is engaged with the pipeline in a mounting hole of the pipeline. An ultrasonic flowmeter, which is provided with a reinforced member. 3. A pipe having an inner peripheral surface on which a lining layer is formed, a mounting hole provided in a side wall of the pipe, and an ultrasonic transmitter and an ultrasonic receiver mounted in the mounting hole. The ultrasonic wave signal transmitted from the ultrasonic wave transmitter and propagated in the fluid in the conduit is received by the ultrasonic wave receiver, and the modulation of the ultrasonic wave signal due to the flow of the fluid is detected. In an ultrasonic flowmeter for measuring the flow rate of fluid in the conduit, a flange portion that is inserted into the mounting hole and abuts the inner peripheral surface of the lining layer on one side and the outer peripheral surface of the conduit on the other side. An ultrasonic flowmeter, comprising: a reinforcing member having a holding member attached thereto, the ultrasonic transmitter or ultrasonic receiver being mounted on the reinforcing member.