JPS6370121A - Apparatus for measuring flow rate and pressure - Google Patents

Abstract

PURPOSE:To simplify the measurement of a mass flow rate, by making it possible to simultaneously measure the flow rate and pressure of a fluid when the temp. of the fluid is constant. CONSTITUTION:When a fluid flows through a pipe body 9, the pressure due to the dynamic pressure of the fluid acts on a pressure receiving plate 4 in a flow direction. Since a hose 12 has almost no restriction force in an up-and- down direction, the force FP due to the pressure P of the fluid acts on the disc part 11 of a T-shaped arm 1. When the pressure receiving area of the disc part 11 is assumed to be S, the force FP becomes FP=P.S. From the foregoing, when forces acting on two load sensors 5, 6 are set to FA, FB, relations FA+FB=FP=P.S and (FB-FA)l1=Fd.l2 hold by considerity the balance for force and moment. By this method, when the forces FA, FB acting on two load sensors 5, 6 are measured, the pressure P and velocity V of flow are obtained and a flow rate is calculated from the velocity V of flow and the inner diameter of a pipe body 9.

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to a flow rate/pressure measuring device that can simultaneously measure the flow rate and pressure of a fluid.

[Conventional technology]

Conventionally, most of the flowmeters used to determine all gas flow rates indicate and transmit the flow rate value under a specific temperature and pressure, and if the temperature or pressure differs from this specific value, , it is necessary to perform artificial correction to obtain the correct flow Iα value.

By the way, the purpose of most flow rate measurements is to know the mass flow rate, which is the absolute amount of fluid passing through a flow path, and when measuring the flow rate of a fluid whose temperature and pressure are not constant, it is necessary to
Measurements are taken in conjunction with a pressure gauge.

In addition, in order to avoid artificial correction, it receives signals from flowmeters, thermometers, and pressure gauges and performs correction calculations electrically.
Flow rate calculators that output mass flow signals are also often used.

[Problem that the invention seeks to solve]

As described above, measuring the flow rate of a fluid whose temperature and pressure are not constant requires a large number of measuring devices, which generally requires large equipment costs.

To improve this problem, several types of mass flowmeters that are not affected by temperature and pressure fluctuations have been put into practical use, but their range of application is limited and they are not widely used. has not yet been reached.

Therefore, the present invention was proposed to solve such conventional problems, and it is possible to measure the flow rate of a fluid and the pressure of the fluid at the same time by a simple means, and is useful in the measurement of mass flow rate. The purpose is to provide a flow rate/pressure measuring device that can reduce equipment costs.

[Means to solve the problem]

In order to achieve this object, the flow rate/pressure measuring device of the first invention comprises a horizontal bar, an arm having a vertical bar extending vertically from the center of the horizontal bar, and an arm having a vertical bar extending vertically from the center of the horizontal bar. a pressure-receiving plate provided at the lower end of the vertical bar; and two pressure-receiving plates each having one end connected to both ends of the horizontal bar and the other end rigidly connected to the pipe wall. and a load sensor, the vertical bar is inserted into the conduit through an insertion hole bored in the conduit wall, and the pressure receiving plate is directly opposed to the flow of fluid flowing in the conduit, and the vertical bar is provided with a load sensor. A flexible joint is provided in the vertical direction between the disc part and the insertion hole to isolate this jiTi manhole from the outside air, and the force due to the pressure of the fluid received by the disc part and the dynamic pressure of the fluid acting on the pressure receiving plate. The present invention is characterized in that the flow rate and pressure of the fluid in the conduit are simultaneously determined 11111 based on output signals from the two load sensors to which the load m is applied.

Also, Book No. 29:: The pressure measuring device consists of a horizontal bar, an arm with a vertical vertical bar hanging vertically from the center of the horizontal bar, and an arm installed on the top of the vertical bar. One end is connected to the disc part, a pressure receiving plate provided at the lower end of the vertical bar, and both ends of the horizontal bar, and the other end is connected to the disk part, the pressure receiving plate provided at the lower end of the vertical bar, and the horizontal bar. 6. Two load sensors each rigidly connected to the road wall, and a temperature sensor housed in a hole drilled into the vertical bar from the center top of the horizontal bar described in 1 above and closed at the lower end.
j1 Eh, above! If the vertical bar is inserted into the pipe through an insertion hole drilled in the pipe wall, the pressure receiving plate is directly opposed to the flow of fluid flowing in the pipe, and the disc part provided in the vertical bar and the insertion hole are inserted into the pipe. A flexible joint is provided in the vertical direction between the two to isolate this insertion hole from the outside air, and a load is applied by the pressure of the fluid that the disc part receives and the force due to the dynamic pressure of the fluid acting on the pressure receiving plate. The pressure of the fluid in the pipe line is measured from the output signal from the two load sensors, and the temperature of the fluid is measured from the output signal from the temperature sensor, and the output of the load sensor and the measured pressure value and temperature are measured. The present invention is characterized in that the flow rate of the fluid can be measured from the flow rate of the fluid.

[Effect]

According to the first invention, the pressure of the fluid flowing in the pipe is measured from the output of the load sensor, and the flow rate of the fluid when the temperature of the fluid is constant is determined based on the output of the load sensor and the measured pressure value. can be measured.

According to the second invention, the pressure of the fluid flowing in the pipe is measured from the output of the load sensor and the temperature of the fluid is measured from the output of the temperature sensor, and the output of the load sensor and these measured pressure values are measured. From the temperature, the flow rate of the fluid as its pressure and temperature vary together can be determined.

〔Example〕

Hereinafter, embodiments of the present invention will be described in detail based on the drawings.

First, to explain the first invention, FIG. 1 is a side sectional view (a sectional view taken along the line A-A in FIG. 2) of a flow rate/pressure measuring device according to the first invention, and FIG. 2 is a front view thereof. be.

In FIGS. 1 and 2, a pressure receiving plate (4) that receives dynamic pressure due to the flow of fluid is provided at the lower end of the vertical bar (2) in the vertical direction of the T-shaped arm (1). Load sensors (5) are installed at both ends of the horizontal bar (3).
, (8) - the force ends are connected. Here, the vertical bar (2) is vertically disposed from the center of the horizontal bar (3).

The other ends of the load m-sensors (5) and (8) are fixed to structurally split supports (7) and (8), respectively, and both ends of the horizontal bar (3) and the support posts (7) , (8) are detected by the load sensors (5) and (6). The pillars (?) and (8) are provided to protrude from the upper part of the tube body (8).

As for the load sensors (5) and (8), it is desirable that the load direction of the sensors is always perpendicular to the horizontal bar (3), so sensors with small displacement such as strain gauges are used.

A nozzle (branch pipe) (10) is provided in the pipe body (9) through which the fluid flows, and a vertical bar (2) is provided from this nozzle (10).
) is inserted so that the pressure receiving plate (4) directly faces the flow of fluid at approximately the center of the pipe body (8),
(8) is fixed to the tube body (3).

A circular plate part (11) perpendicular to the vertical bar (2) is provided near the upper end of the vertical bar (2) (connection part with the horizontal bar (3)), and the circular plate part (11) is connected to the nozzle (io). Board part (11)
A bellows (12) is connected between the nozzle (10) and the nozzle (10) to prevent the fluid inside the pipe (9) from leaking to the outside.

The flexible pipe (12) expands and contracts in the length direction with a relatively small force,
It has enough strength to withstand the pressure of the fluid inside the tube (3).

In addition, as in the other embodiment shown in FIG. 3, a flange (13) is provided on the nozzle (10) provided on the tube body (9), and a detection device similar to the above-mentioned embodiment is provided on the other flange (14). The flanges (13) and (14) may be connected to each other by providing the flanges (13) and (14).

In this case, since the tube body (8) and the detection device can be separated,
It is ranked 1a in terms of production and maintenance.

Next, the operation of the flow rate φ pressure measuring device configured as described above will be explained.

When fluid flows within the pipe body (8), a force due to the dynamic pressure of the fluid acts on the pressure receiving plate (4) in the flow direction.

If this force is Ft+, then Fd is F, 1=Keρ*V2·e, (1), where ρ: original fluid density V: fluid flow velocity: proportionality constant.

In addition, since the flexible pipe (12) has almost no restraining force in the vertical direction, if the pressure of the fluid is P, it forms a T-shaped arm (12).
) is subjected to a force FP due to the pressure P of the fluid. When the pressure-receiving area of the disk portion (11) is S, Fp is as follows: Fp=P@S -- (2).

From the above, the two load sensors (5) and (II)
If the forces that act on
(FB -Fo)u+ =Fd-12...(4), here! ; L+ and Tate 2 are the length of the horizontal par (3) and vertical bar (2) on one side, respectively.

If we rearrange equations (1) to (4), becomes.

Generally, if the type of fluid and temperature are constant, then ρ is the pressure P
is determined by, and since S, s, and 2 are constant,
Two load sensors (5).

If we measure the forces F8 and FB acting on (6), we get (5
).

The pressure P and the flow rate (2) are obtained by equation (8), and the flow rate is determined by the flow rate (2) and the inner diameter of the tube (9).

Note that K·ρ is determined by the pressure P determined by alit.

As described above, according to the above-mentioned flow rate and pressure measuring device, it is possible to simultaneously measure the flow rate and pressure, which was conventionally done by installing a flow meter and a pressure gauge separately, using a simple structure of the detection device.

Next, a diversion/pressure measuring device according to the second invention will be explained with reference to FIG. Note that structures that are the same as those in the embodiment of the first invention described above are designated by the same reference numerals, and description thereof will be omitted.

In Figure 4, the vertical bar (2) of the T-shaped arm (1) is shown.
) is provided with a hole (15) whose lower end is closed,
A temperature sensor (16) is inserted into this hole (15).

This makes it possible to simultaneously measure flow rate, pressure, and temperature without preparing a new structure for temperature measurement. Ill becomes possible at lower cost than before.

In order to automatically measure the mass flow rate, the signals from the two load sensors (5) and (8) and the temperature sensor (1B) must be processed using a microprocessor, etc. Bye.

〔Effect of the invention〕

As explained above, in the first invention, the flow rate of the fluid when the t'M degree of the fluid is constant and the pressure of the fluid can be measured simultaneously with a simple structure, and the second invention has a simple structure. The pressure and temperature of the fluid both fluctuate due to ll! The flow 11 of the fluid of j, the pressure and temperature of the fluid can be measured simultaneously.

As described above, according to the present invention, it is not necessary to use as many devices as in the past for measuring mass flow rate, and it is possible to reduce the equipment cost for measuring mass flow rate.

[Brief explanation of the drawing]

Fig. 1 is a side sectional view of the device showing the flow rate/pressure side 5 of the embodiment of the first invention (a sectional view taken along the line A-A in Fig. 2);
Q Ii, front view IA of the quantity/pressure measuring device, FIG. 3 is a side sectional view of the flow rate/pressure measuring device of another embodiment, FIG. 4 is the flow rate/pressure Jllll constant device of the embodiment of the second invention, ff is a side cross-sectional view. 1...Life arm 2...Vertical bay 3@...Horizontal bar 4...Pressure plate 5.6...Loading sensor
7,8 φ・Support 18・--Fu' government body 10 m a e
Nozzle-11... Disc part 12... Serpentine pipe 13
．． 14 Working flange 15・Fist bone hole 16 @Temperature sensor

Claims (2)

[Claims] (1) A horizontal bar, an arm with a vertical vertical bar hanging vertically from the center of the horizontal bar, a disc part provided at the top of the vertical bar, and an arm provided at the bottom end of the vertical bar. A pressure receiving plate and two load sensors each having one end connected to both ends of the horizontal bar and the other end rigidly connected to the pipe wall, and the vertical A bar is inserted into the pipe line so that the pressure receiving plate faces the flow of fluid flowing inside the pipe line, and a flexible joint is provided in the vertical direction between the disk portion provided on the vertical bar and the insertion hole. , this insertion hole is isolated from the outside air, and a load is applied by the pressure of the fluid received by the disc part and the dynamic pressure of the fluid acting on the pressure receiving plate, based on output signals from the two load sensors, A flow rate/pressure measuring device characterized in that the flow rate and pressure of the fluid in the pipeline can be measured simultaneously. (2) A horizontal bar, an arm having a vertical vertical bar hanging vertically from the center of the horizontal bar, a disc part provided at the top of the vertical bar, and an arm provided at the bottom end of the vertical bar. A pressure receiving plate, two load sensors each having one end connected to both ends of the horizontal bar and the other end rigidly connected to the pipe wall, and a lower end bored into the vertical bar from the center top of the horizontal bar. The vertical bar is inserted into the pipe through an insertion hole drilled in the pipe wall, and the pressure receiving plate is adjusted to the flow of fluid flowing in the pipe. A flexible joint is provided in the vertical direction between the disc part provided on the vertical bar and the insertion hole to isolate the insertion hole from the outside air, and the pressure of the fluid received by the disc part and the pressure receiving plate are The load is applied by the force due to the dynamic pressure of the working fluid2
The pressure of the fluid in the pipe line is measured from the output signal from the two load sensors, and the temperature of the fluid is measured from the output signal from the temperature sensor, and the output of the load sensor and the measured pressure value and temperature are measured. A flow rate/pressure measuring device characterized in that it is capable of measuring the flow rate of the above fluid.