JPH01420A - mass flow meter - Google Patents

Abstract

(57) [Summary] This bulletin contains application data before electronic filing, so abstract data is not recorded.

Description

DETAILED DESCRIPTION OF THE INVENTION FIELD OF INDUSTRIAL APPLICATION The present invention relates to mass flow meters, particularly devices for measuring the mass flow rate of a fluid in any vibrating system.

[Prior Art] The mass flow rate of fluid through a given flow path may be different depending on whether the flow path is provided in various types of vibrating systems or in non-vibrating systems. many.

In particular, in today's systems, fluid flow paths are often located within vibrating systems in various environments, and it is therefore important to develop devices that accurately measure the quality and flow rate of fluid flowing through such flow paths. It was wanted.

As an example of the vibration system, let's take a car, especially a car equipped with a diesel engine and subject to large vertical vibrations.This car is equipped with various types of fuel supply vibrators.
Therefore, if the mass flow rate Mj of the fuel flowing through these vibrators could be accurately determined, it would be extremely convenient for collecting and controlling various data.

For example, when determining the fuel consumption AM of an automobile, in the conventional apparatus, the volume of fuel flowing in the pipe is determined M1, and the fuel consumption is measured.

However, in automobiles, especially those equipped with diesel engines in which a portion of the supplied fuel is used to cool the engine and then returned to the tank, air bubbles are easily mixed into the fuel flowing in the pipes, resulting in the mass The flow rate changes from time to time depending on the situation.

Therefore, simply measuring the volume of fuel flowing inside the pipe inevitably causes a relatively large error in the fuel consumption measurement data.

On the other hand, it will be understood that if the mass flow rate itself of the fuel flowing into the pipe can be directly measured, it is possible to accurately measure the fuel consumption even if air bubbles are mixed into the supplied fuel.

For this reason, various proposals have been made to determine M1 for the mass of fuel, etc., but all of these methods measure the mass in a stationary system, and the mass flow rate in a predetermined vibration system. There were no proposals regarding techniques for measuring or suggesting this.

[Problems to be solved by the invention] The present invention has been made in view of these problems,
The purpose is to provide a mass flow meter that is capable of accurately measuring the mass flow rate of a liquid flowing within a predetermined vibration system.

[Means for Solving the Problems] In order to achieve the above object, the present invention provides a device for determining the mass flow rate of fluid in dP within a predetermined vibration system, comprising: a pedestal provided in the vibration system; a fluid container provided on the pedestal for temporarily storing the fluid; a load sensor for detecting the total load of the fluid container and the fluid stored in the pedestal on the pedestal 1-; and a vibration of the pedestal. an acceleration sensor that detects acceleration; a variable amplifier that amplifies and outputs the output of the acceleration sensor at an arbitrary amplification factor; and an amplification factor of the variable amplifier that is qH so that the output of the load sensor and the output of the variable amplifier match. Particularly, the present invention is characterized in that it includes a comparison circuit for controlling, and an arithmetic circuit for calculating the mass flow rate of fluid in the vibration system using a predetermined arithmetic expression based on the amplification factor of the variable amplifier. A device for measuring the mass flow rate of a fluid within a predetermined vibration system, the device comprising: a pedestal provided in the pedestal; a fluid container provided on the pedestal to temporarily store the fluid; a load sensor that detects the total load of the fluid container and the fluid stored in the container; an acceleration sensor that detects the vibration acceleration of the pedestal; a first amplifier that amplifies and outputs the output of the load sensor; a second amplifier that amplifies and outputs the output; and a calculation circuit that calculates the mass flow rate of the fluid in the vibration system using a predetermined calculation formula based on the outputs of the first amplifier and the second amplifier. It is characterized by

[Example] Next, preferred embodiments of the present invention will be described based on the drawings.

First Embodiment FIG. 1 shows a preferred first embodiment of the quality r:L flowmeter according to the present invention. A load m sensor 1 is placed on the mounted frame 10.
The fluid container 2is 14 is integrally attached and fixed via the container 2, and the container 14 and the pedestal 10 are formed to vibrate downward as a unit.

Further, a guide wall 16 is provided around the container 14, and is erected from the pedestal 10, and the container W14 is moved by a guide roller 18 provided inside the guide wall.
It is regulated to prevent vibration in the lateral direction.

In this vibration system, the fluid to be 11I11 constant is supplied into the container 14 via the supply pipe 20, and the liquid 100 stored in the container 14 is directed to a desired location via the discharge vibrator 22. is configured to be supplied.

This discharge pipe 22 is provided with a discharge valve 24 . Since the discharge valve 24 is normally closed, the liquid 100 supplied from the supply pipe 20 is stored in the container 14 one after another. Then, a predetermined amount of liquid 10 is placed in the container 14.
When 0 is stored, the discharge valve 24 is opened and the liquid 100 in the container is discharged to the outside.

Therefore, the single sensor 2 detects and outputs the load of the container 14 on the pedestal 10 (the sum of the load of the container 14 itself and the load of the liquid 100 stored in the container 14), and this detection signal is The signal e2 is multiplied by A using the amplifier 26 and outputted to the comparator circuit 28.

Furthermore, the mass flowmeter of the present invention includes an acceleration sensor 30 on the pedestal 10 to detect the downward vibration acceleration α of the pedestal 10 and output it to the nJ variable amplifier 32 .

The variable amplifier 32 is configured such that its amplification factor A1 can be set to an arbitrary value, amplifies the acceleration detection signal by A times, and outputs the amplified signal e1 to the comparator circuit 28.

Then, the comparison circuit 28 outputs an amplification factor control signal to the variable amplifier 32 so that the detection signals e and el output from the amplifiers 26 and 32 match.

Here, the signal e1 output from the variable amplifier 32
As is clear from the above explanation, is the acceleration of the vibration system in the downward direction α°""6°""" as shown in the following equation.
dt2 °°“”)I Here, X is the vertical coordinate of the frame 10/+'
It represents t iR.

In addition, as is clear from the above explanation, the signal e2 output from the other amplifier 26 is transmitted to The value is obtained by amplifying the detection signal of 1 il', which is the sum of the loads of the liquid 100, by A2.

Here, the density of the fluid 100 is p, and the flow rate of the fluid 100 supplied via the supply pipe 20 is q (t)
Assuming that the volume of the fluid 100 stored in the container 14 is V, the output e2 of the amplifier 2δ is mathematically expressed by the following equation.

2x e 2-A 2°", 12 2x -A2 (f p (t)"(゛)""dt"...
(2) Therefore, it will be understood that when the comparison circuit 28 calculates the difference Δe between these two signals, the calculation formula is given by the following formula.

Δe−e, −e2 2x A2・ge(ρ(t)q(t)dt l・□t2 d2u−(Al−A2fρ(t)q<t)dt 1t2... (3) And the comparison circuit 28 controls the amplification factor A1 of the variable amplifier 32 so that the Δe becomes 0.
As shown by the following equation, .times..times..times..times..times..times..times..times..times..times..times..times..times..times..times..times..times..times.

A1-A2j'p(t)q(t)dt...
(4) Therefore, by converting the fourth equation as follows, the mass flow rate of the liquid 100 stored in the container 14, that is, the fluid 1 flowing through the pipe provided on the vibration system.
00 mass flow rate can be determined accurately.

The mass flow is - Therefore, in the present invention, an arithmetic circuit 34 is provided which inputs the amplification factor A1 of the variable amplifier 32, and this arithmetic circuit 34 calculates the mass flow rate of the fluid 100 based on the fifth equation. and is formed to be displayed on the display section 36.

The present embodiment has the above configuration, and its operation will be explained next.

FIG. 2 shows the output waveforms of the amplified signals output from the six amplifiers 26 and 32 in this embodiment.

That is, when fluid is supplied into the container 14 through the supply pipe 20, the 6:1 gravity sensor 2 detects the amount of fluid in the container 14.
The load in gradually increases, and the signal e2 output from the amplifier 26 gradually increases while including a frequency component synchronized with the downward vibration of the frame 10, as shown in FIG. I will do it.

On the other hand, the acceleration sensor 30 detects the vibration acceleration of the gantry 10 in the downward direction. Therefore, when the amplification factor A1 is fixed at a constant value, the amplification output e of the amplifier 32 becomes a value corresponding to the downward vibration acceleration of the frame 10 at 111, as shown in FIG. 2(B). Become.

Here, when considering the waveforms of the signals shown in FIGS. 2(A) and 2(B), it will be understood that both waveforms are similar waveforms synchronized with the vertical vibration acceleration of the pedestal 10.

Therefore, as in the present invention, by controlling the amplification factor A1 of the 11-square amplifier 32 so that Δe shown in the third equation becomes zero, the output e1 of the amplifier 32 is as shown in FIG. 2(C). It is understood that the amplification factor A1 is a value that indirectly represents the mass flow port ρ(t)q(t) of the fluid 100 as described above. Good morning.

Therefore, according to the present invention, by calculating the amplification factor A1 controlled in this way based on the above-mentioned formula 5, the mass flow rate of the fluid supplied through the pipe provided in the vibration system can be determined by 1E. can be asked for.

In particular, according to the present invention, even when the density ρ(1) of the fluid 100 flowing through the vibration system changes from time to time due to bubbles generated inside the fluid, the density of the fluid 100 is maintained regardless of such density changes. Mass flow rate can be measured accurately.

In this way, the mass flow meter of the present invention can accurately measure the mass flow rate of the fluid flowing within the vibration system, and is therefore widely used for regular use of the vibration system in each heel environment. For example, by installing the mass flow meter of the present invention in a car, it is possible to accurately determine the mass flow rate of fuel flowing inside the car, and to improve the fuel efficiency without being affected by, for example, bubbles generated in the fuel. It becomes possible to carry out all determination accurately.

In the flowmeter of this embodiment, when the volume V of the fluid 100 stored in the container S14 becomes equal to or greater than a predetermined reference value, a sensor (not shown) detects this and opens the discharge valve 24, and the container 14 The fluid 100 is discharged from the inside to the outside, and then the discharge part 24 is closed, and the measurement of the mass flow rate of the fluid 100 is restarted again.

Furthermore, according to the present embodiment, the case where one mass flow meter is provided has been described as an example, but the present invention is not limited to this, and the present invention is not limited to this. When used in a vibrating system, it is also possible to continuously measure the mass flow rate of liquid flowing within the vibrating system.

Second Embodiment A second preferred embodiment of the present invention is shown in FIG. do.

Characteristic item 11 of this embodiment is that instead of the acceleration sensor 30, which is not shown in FIG.
0 and a load 1n sensor 42 for detecting the load of this reference object 40 on the frame 101-.

In an embodiment, the reference object 40 is a load sensor 42
It is integrally attached and fixed to the pedestal 10'2 via the pedestal 10'', and is formed to vibrate in the vertical direction together with the pedestal 10.

Therefore, similar to the acceleration sensor 30 shown in the first embodiment, the load sensor 42 outputs a signal representing the vibration acceleration of the pedestal 10 in the vertical direction. By feedback controlling the amplification factor A1 of the amplifier 32 based on the signal obtained in the first embodiment, the fluid 100 flowing within the vibration system is
It becomes possible to accurately measure the mass flow of

In this embodiment, the supply vibrator 20 is provided with a flow rate control valve 44 to control the flow of liquid into the container 14.

Third Embodiment FIG. 4 shows a third preferred embodiment of the present invention, in which members corresponding to those in the first and second embodiments are designated by the same reference numerals and their explanations will be omitted.

The characteristic feature of this embodiment is that an amplifier 40 whose amplification factor is fixed to A1 is used in place of the variable amplifier 32 shown in FIG.
is input to the calculation circuit 34, and the mass flow port of the fluid 100 is calculated and output.

That is, the mass of 140 containers is m. , the mass of the fluid 100 stored in the container 14 is ml, then the signals el and e2 output from the amplifiers 40 and 26 are expressed by the following equations.

2x el-Alkl (-) -(6)dt2 2x... (7) Here, kl has the unit Volt/(m/5
ec2), and k is the constant of ec2). 11th place is VoH/
Each represents a constant of H.

Then, by converting the sixth equation, the following equation is obtained, d2) ■ □ Cod □ ... (8) dt 2A I k + Substituting this into the seventh equation, the output e2 of the amplifier 26
is expressed by the following formula.

te2-A2k2(mo+ms)A,
lゝ1... (9) Then, convert this 9th equation as shown in the following equation, and get e2
At kl - mO 10 ml -.

e lA 2 k 2 (10) When the quality Qm1 of the fluid 100 stored in the container 14 is determined based on this 10th equation, the value of this ml is expressed by the following equation.

A　lk　　　　62 m.

A 2 k 2 e r ...(11) In this 11th equation, A, , A2. To,.

k2 and mg are each constants, and only el and e2 are variables.

Therefore, by expressing this variable in the following equation, f(t)−
□ ... (12) t The 11th equation is a function of f (t) as shown in the following equation.

It will be expressed as follows.

Al　　k.

□ -・ f (t) - m.

8 k2...(13) Therefore,
By time-differentiating the quality Q m 1 of the fluid 100 determined by the thirteenth equation as shown in the following equation, the first
The mass flow rate of the fluid 100 can be measured in the same manner as in the example.

dml A, kl d □ −□・□・□ f (t) dt A 2 kt d t...
(14) Therefore, the present invention inputs the outputs e and e2 of the amplifiers 40 and 26 to the calculation circuit 34, calculates the above-mentioned formula 14, and displays the mass flow rate of the fluid 100 on the display unit 36. It is formed.

Fourth Embodiment FIGS. 5(A) and 5(B) show a preferred fourth embodiment of the present invention, in which members corresponding to those in the previous embodiment are given the same reference numerals and their explanations will be given below. Omitted.

A feature of this embodiment is that it is possible not only to measure the mass flow rate of the fluid flowing into the container 14, but also to measure the mass flow rate of the fluid discharged from the container 14.

In this embodiment, as in the case of FIG.
has been established. Then, by supplying liquid to the container 14 with the flow rate control valve 44 opened and the discharge valve 24 closed, as shown in FIG. Measurement is done.

In this embodiment, as shown in FIG. 5(B), with the flow rate control valve 44 closed and the discharge valve 24 open, the container 1 is
Measure the mass flow rate of the liquid delivered from 4.

In other words, the calculation for determining the mass flow rate is as follows:
4 and discharged from the container 14, exactly the same formula is used. Therefore, by processing the detection signal from the load sensor 12 while the liquid is being discharged from the container 14, the mass flow of the liquid in the vibration system can be accurately calculated i1 as in the previous embodiment.
1 can be done.

Fifth Embodiment A fifth preferred embodiment of the present invention is shown in FIG. 6, in which members corresponding to those of the previous embodiments are given the same reference numerals and their explanations will be omitted.

A feature of this embodiment is that both the flow rate of liquid supplied from the tank 100 to the diesel engine 200 and the flow rate of liquid returned from the diesel engine 200 to the tank 100 can be continuously measured.

That is, from the tank 100 to the diesel engine 200
A system 300 with containers 14a, b is provided in the liquid supply path for measuring the mass flow of the liquid being discharged. A flow control valve 44a is connected to the supply pipe 20a of the container 14a, and a discharge valve 2 is connected to the discharge vibrator 22a.
4a, a flow control valve 44b is provided on the supply pipe 20b of the container 14b, and a discharge valve 24 is provided on the discharge vibrator 22b.
b is provided. Further, in the return path from the diesel engine 200 to the tank 100, there is a system 4 equipped with a container 14 csd for measuring the mass flow rate of the supplied liquid.
00 is set.

The supply vibrator 22c of the container 14c is provided with a flow control valve 24c, the discharge pipe 20c is provided with a discharge valve 44c, and the supply vibrator 22d of the container 14d is provided with a flow control valve 24c.
d, the discharge vibrator 20d is provided with a discharge valve 44d.

In such embodiments, the mass flow of liquid is continuously measured as follows.

In the state shown in FIG. 6, the flow control valve 4 of the system 300
4a is open and drain valve 24a is closed, so that volume 514a is filled with liquid from tank 100. Then, the flow control valve 44b is closed, and the discharge valve 24
b is opened, liquid is discharged from container 14b and this liquid is supplied to diesel engine 200.

In this state, the load sensor 1 of the container 14b
By measuring the quality of the liquid discharged from the container 14b by the flow meter 2b, the amount of liquid supplied to the diesel engine 200 can be determined.

In addition, when the volume 2'A 14b becomes empty or when the liquid level reaches a predetermined low level, the flow rate control valve 44a144b
and switching the opening and closing of the discharge valves 24a and 24b. In other words,
By closing the flow control valve 44a and opening the discharge valve 24a, the liquid is discharged from the container 14a to the diesel engine 200.
Supply the liquid of tank 100 to volume ZH4b by opening control valve 44b to flow and closing drain valve 24b.

And load 11' of yong'D 14 a! The sensor 12a measures the flow rate of the Il1 body supplied to the diesel engine 200.

In this way, the flow rate of liquid supplied from the tank 100 to the diesel engine 200 can be continuously measured.

Furthermore, in the system 400, the flow rate returned from the diesel engine 200 to the tank 100 is continuously measured.

In the state shown in FIG. 6, the flow control valve 2 of the system 400
4c is open and drain valve 44c is closed, so that container 14c is filled with liquid returning from diesel engine 200. Then, since the flow rate control valve 24d is closed and the discharge valve 44d is opened, liquid is discharged from the container 14d, and this liquid is returned to the tank 100.

In this state, the amount of liquid returned from the diesel engine 200 can be measured by measuring the mass flow rate of the liquid supplied to the volume 514c using the load sensor 12c having the volume W 14 c.

Furthermore, when the container 14c becomes full or reaches a predetermined high liquid level, the flow rate control valves 44c and 44d and the discharge valves 24c and 24d are switched between opening and closing. That is, by closing the flow rate control valve 24c and opening the discharge valve 44c, the liquid is returned from the container 14c to the tank 100, and by opening the flow rate control valve 24d and closing the discharge valve 44d, the volume W14d is returned to the diesel engine 200. Supply the liquid that comes back. And 6:j ir of container 14d
The flow of liquid returning from the diesel engine 200 is measured by the i sensor 12d as i1?1.

In this way, the flow of liquid returning from the diesel engine 200 towards the tank 100 can be measured/l-1.

As described in 1- above, according to the device of the fifth embodiment, both the supply of fuel from the fuel tank of the vehicle that is the imaging system to the diesel engine and the amount of fuel returned from the diesel engine to the tank are continuously controlled. Not only can it be measured accurately, but the difference can also be used to calculate the net fuel consumption of the diesel engine.

In addition, in FIG. 1, FIG. 3, FIG. 4, FIG. 5, and FIG. 6, the inflow and outflow pipes 20 and 22 have IjJ flexibility,
The vibration of the stand 10 causes the container 14 to vibrate 20.22.
It is formed in such a way that it does not generate a FI constant when subjected to external force.

[Effects of the Invention] As explained above, according to the present invention, it is possible to accurately measure the mass flow of fluid flowing within a predetermined vibration system, and it is possible to accurately measure the mass flow of fluid flowing within a vibration system in various environments. Mass flow can be used widely as a meter.

[Brief explanation of the drawing]

FIG. 1 is an explanatory diagram showing a preferred first embodiment of the flow meter according to the present invention, FIG. 2 is an explanatory diagram of waveforms in various parts of the circuit of the first embodiment, and FIG. FIG. 4 is an explanatory diagram showing a third preferred embodiment of the present invention. FIG. 5 is an explanatory diagram showing a fourth preferred embodiment of the present invention. FIG. 6 is an explanatory diagram showing a fourth preferred embodiment of the present invention. It is an explanatory view showing a preferred fifth example. 10... Frame 12... Load sensor 14... Fluid container 20... Supply pipe 22... I non-output vibe 26... Amplifier 28... Comparison circuit 30... Acceleration sensor 32 ... Variable amplifier 34 ... Arithmetic circuit 40 ... Amplifier 100 ... Fluid 200 ... Diesel engine 300.400 ... System applicant Higashi Jha Precision dIIJ Co., Ltd. fL agent Patent attorney Yoshi 1) 1i1f 2 (2 others), 8-42 Figure 1 Figure 2 (B) e■ (C) Figure 4

Claims (4)

[Claims] (1) A device for measuring the mass flow rate of a fluid within a predetermined vibration system, comprising: a pedestal provided in the oscillation system; a fluid container provided on the pedestal to temporarily store the fluid; A load sensor that detects the total load of a fluid container and the fluid stored in the container on a pedestal, an acceleration sensor that detects vibration acceleration of the pedestal, and an output of the acceleration sensor that is amplified at an arbitrary amplification factor. a comparison circuit that controls the amplification factor of the variable amplifier so that the output of the load sensor and the output of the variable amplifier match, and a vibration system that uses a predetermined calculation formula based on the amplification factor of the variable amplifier. A mass flowmeter comprising: an arithmetic circuit that calculates a mass flow rate of a fluid within the mass flowmeter. (2) In the device according to claim (1), the acceleration sensor includes: a reference object provided on a pedestal and having a standard mass; and a load sensor that detects the load of this reference object on the pedestal. A mass flowmeter characterized in that it is formed using (3) In the device according to any one of claims (1) and (2), the fluid container load sensor outputs its detection signal to a comparison circuit via an amplifier having a predetermined amplification factor. A mass flow meter featuring: (4) A device for measuring the mass flow rate of a fluid within a predetermined vibration system, comprising: a pedestal provided in the oscillation system; a fluid container provided on the pedestal to temporarily store the fluid; a load sensor that detects the total load of a fluid container and the fluid stored in the container on a pedestal; an acceleration sensor that detects vibration acceleration of the pedestal; a first amplifier that amplifies and outputs the output of the load sensor; a second amplifier that amplifies and outputs the output of the acceleration sensor; a calculation circuit that calculates the mass flow rate of the fluid in the vibration system using a predetermined calculation formula based on the outputs of the first amplifier and the second amplifier; A mass flow meter comprising: