JP2909309B2 - Liquid level meter for transport aircraft - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

The present invention relates to relates aircraft, ship, the liquid volume meter of the liquid tank transport aircraft such as an automobile.

[0002]

2. Description of the Related Art Conventionally, as shown in a partial vertical sectional view of FIG. 4, a liquid level measuring device in a liquid tank mounted on an aircraft, a ship, an automobile, etc. Is inserted to detect the level of the liquid surface 30 formed in the tank, and the remaining liquid amount is obtained based on this level.

[0003]

However, in this type of liquid level measuring device, the liquid level does not remain horizontal as shown in FIG. For this reason, the numerical value of the level detected by the liquid level gauge has low accuracy and lacks reliability. In particular, in the case of an aircraft operating a long distance, it is very important to accurately measure the liquid amount even in the swinging state. This
Or as described in JP-A-4-29018.
Attach the case to the top of the liquid tank
At the boundary between the case and the liquid tank, a gas volume changer (spi
And the same gas volume changer
Change the pressure in the liquid tank and the case, and
Fluctuations are detected by a pressure detector, and liquid is detected based on the detected value.
There is a known volume measuring device for measuring the volume in a tank.
However, in this device, droplets generated when the liquid tank swings
Or liquid mass (mist) adheres to volume changer or pressure detector
Measurement accuracy is poor.
Since two output devices are required, the cost increases and the operator becomes
There are problems such as complicated steps.

[0004] The present invention has been proposed in view of such circumstances, and regardless of the magnitude of the fluctuation of the liquid tank, the gas is
Prevents mist from adhering to volume changers and pressure sensors
Measurement accuracy and install a pressure detector
It is an object of the present invention to provide a liquid meter for a transport machine in which the number is reduced to one and cost is reduced .

[0005]

For that purpose, the transportation according to the present invention is performed.
Machine for fluid meter, in the liquid quantity measuring device of the liquid tank is mounted on a transportation machine, provided at the top of the liquid tank, and a housing in communication with the same fluid tank, in the same housing
And one gas volume changer and one pressure detector which is provided in the upper, provided in a lower portion of the housing, liquids and splash splashed from the liquid tank has collided or adhere
After that, it has a wall that falls on the liquid tank by gravity
Comprising a trapping structure that a volume change that is given by the gas volume change unit [Delta] V ₀ and [Number 1] on the basis of the pressure P and the pressure change ΔP is detected by the pressure detector type

[Expression 1] V₀= −P (ΔV₀/ ΔP)In the above liquid tankGas volume V₀,Up
RecordV from the total volume of the liquid tank₀By subtracting
Liquid tankInsideThe characteristic is that the liquid volume ofDoing
You.

[0006]

SUMMARY OF According to this structure, when operating the volume changer, is compressed gas in the liquid tank, the liquid tank
The internal pressure changes slightly. The amount of change is a total <br/> measured by the pressure detector. In this case, since the pressure change amount and the absolute value of the pressure have a functional relationship described later with the gas volume at that time, the gas volume in the liquid tank can be calculated using these measured values. Further, the liquid volume is obtained by subtracting the gas volume from the liquid tank volume. When the liquid tank swings
If the liquid level is disturbed, the mist (droplet) with a small diameter or a larger liquid
Lumps are generated, and these scatter and fly in the gas.
You. Note that these trajectories are generally straight or
It is an object line. In this way, the mist generated on the liquid surface
Make a linear or simple parabolic
Or scattered upward at an angle of inclination,
The moving mist must strike somewhere on the wall of the trap.
After being pierced and attached and captured, gravity causes the
Fall. For this reason, the upper volume changer and pressure detector
The To prevent that the droplets adhere, it increased total Hakasei degree
You can mow it. In general, in a state where a liquid and a gas are mixed in a closed container, assuming that the compressibility of the liquid can be neglected, if the volume of the gas is set to V ₀ , Equation 2 is established by the gas equation.

[Equation 2] PV₀= RT When the temperature is constant, PV₀= Constant PΔV₀+ V₀ΔP = 0 V₀= −P (ΔV₀/ ΔP)Here, P: internal pressure of the liquid tank  V ₀ ： Gas volume in liquid tank  T: Temperature in liquid tank (absolute temperature)  R: gas constant  ΔV ₀ : Volume change ΔP ₀ : Pressure change Therefore , Volume change ΔV₀Change when pressure is given Δ
By measuring P, the volume of the gas is determined. liquid
Volume is calculated by subtracting the gas volume from the total volume.
It becomes possible.In addition, one pressure detector
Measurement of liquid volume can be performed at the same location, reducing production costs
Becomes

[0007]

BRIEF DESCRIPTION OF THE DRAWINGS FIG.
1, 2 and 3 are partial longitudinal sectional views showing a first embodiment, a second embodiment and a third embodiment, respectively.

[0008] First, in the first embodiment shown in FIG. 1, marks
Reference numeral 10 denotes a liquid tank.
An opening is provided at the top, and the housing 3 is airtightly connected to the opening. The upper portion of the housing 3 and speakers 1 as a gas volume change control and Ma <br/> Ikurohon 2 as pressure detectors that have been attached. This mounting structure also
The airtightness of the housing 3 is not impaired. At the lower part of the housing 3, a trap structure is provided.
The jing 3 is connected to the liquid tank 10 through the trap structure.
Connected to the top of In the first embodiment , the trap structure is formed by tapering the lower part of the housing 3 downward.
As the shape of the housing changes, the upper part has a cylindrical shape and the lower part has a tapered conical shape.
Null 5 is coaxially supported on housing 3 by stay 4
It is configured. As a result, both (housing 3 and interface
5) during a horizontal section, Y in a vertical section
A character-shaped space is formed .

[0009] Next, the trap structure of the second embodiment shown in FIG. 2 is formed in a cylinder having a flange, an outer Inter that will be coaxially connected to the housing 3 by a flange outer peripheral portion
Null 5A and coaxial with the inside of this outer internal 5A
Rutotomoni lower end is closed upper end is disposed has not been formed between the inside internal 5B shape expanding conically
You. Reference numeral 4A denotes a four radial support plates, this
The four support plates 4A are arranged at equal intervals and the internal 5A
The support on the center line of the housing 3.

[0010] In the third embodiment shown in FIG. 3, trapping structure
Parts are-out central perforated outer peripheral portion is bonded to the housing 3
Disk 6 and internal 5 of inverted T-shaped pipe joint structure
C , an inverted T-shaped pipe at the lower end of the opening of the disk 6
Are joined together at their upper ends .

In each of the first to third embodiments, the track
Each of the loop structures forms a baffle plate or refraction channel
It is configured with an internal to be performed. That
When the liquid tank oscillates, the liquid level is disturbed and
Strikes (droplets) and larger liquid masses,
It will fly and fly inside. These movement trajectories
Is generally straight or parabolic. in this way,
Mist generated on the liquid surface is linear motion or simple parabola
Make a linear motion and move vertically upward, or upward with a tilt angle
The mist that performs the above movements even if it scatters to the trap
Somewhere on the wall of the part was always caught and adhered
Later, it falls into the liquid tank by gravity. Therefore,
Speaker 1 and microphone 2 are contaminated by mist.
Measurement accuracy can be improved.
You. Also, only one microphone 2 is installed
In other words, because of the small number of component devices,
Probability is small and reliability is high. Also, simple structure
Therefore, the manufacturing cost can be kept low.

According to the conventional apparatus, the wave of the liquid surface is broken by the rocking of the tank to generate droplets and liquid mist (mist), which are scattered and are measured by a measuring device (a volume changer or a pressure detector).
When attached to the vessel), since the characteristics are changed, the measurement error is raw <br/> Jill fear. However, in the embodiment described above, splash which occurs in a liquid <br/> tank, the droplets collide with one of the wall surfaces of the in-<br/> Tanaru 5, 5A, 5B or housing 3 of the trap structure After adhering, by gravity conveyed wall surface
Will be falling into the liquid tank, as a result, it is possible to <br/> prevent droplets adhering to the mist scattered and the measuring device to the housing top. Therefore , it is possible to accurately measure the gas volume change ΔV ₀ by the speaker 1 in the housing and the pressure change ΔP detected by the microphone.
Can, on the basis of Expression 1, good accuracy the volume V ₀ which liquid
It is possible to find a phrase.

V ₀ = −P (ΔV ₀ / ΔP)

[0013]

As described in detail above, according to the present invention,
The following effects can be obtained. (1) Splashes and droplets (mist) generated in the liquid tank
After colliding and adhering to the wall of the wrap structure, it travels down the wall
Drop to the liquid tank, gas volume changer or pressure detector
Does not scatter on the upper part of the housing provided with
Measurement accuracy of gas volume changer and pressure detector
There is no danger of lowering due to the adhesion of
And pressure changes can be accurately measured. (2) One gas volume changer and one pressure detector are provided
Because the number of element devices is small,
The probability of failure during use is small, and the reliability of the fluid meter can be improved.
it can. The calculation means also has a simple configuration,
The whole structure is simplified, and the cost can be reduced .

[Brief description of the drawings]

FIG. 1 is a longitudinal sectional view showing a first embodiment of the present invention.

FIG. 2 is a longitudinal sectional view showing a second embodiment of the present invention.

FIG. 3 is a longitudinal sectional view showing a third embodiment of the present invention.

FIG. 4 is a longitudinal sectional view showing a conventional liquid amount measuring device for a liquid tank of various transporters.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Volume changer (speaker) 2 Pressure detector (microphone) 3 Housing 4 Stay 4A Support plate 5 Internal 5A Internal 5B Internal 5C Internal 6 Disk 10 Tank

──────────────────────────────────────────────────続 き Continued on the front page (58) Field surveyed (Int.Cl. ⁶ , DB name) G01F 22/02 G01F 17/00

Claims (1)

(57) [Claims] In the liquid quantity measuring apparatus according to claim 1 liquid tank mounted on a transportation machine, provided at the top of the liquid tank, and a housing in communication with the same fluid tank, in the same housing
And one gas volume changer and one pressure detector which is provided in the upper, provided in a lower portion of the housing, liquids and splash splashed from the liquid tank has collided or adhere
After that, it has a wall that falls on the liquid tank by gravity
Comprising a trapping structure that, [Expression 1] ## EQU1 ## based on the pressure P and the pressure change ΔP is detected by the volume change [Delta] V ₀ and the pressure detector that provided by the gas volume change unit V ₀ = by -P (ΔV ₀ / ΔP), determine the volume V ₀ which gas in the liquid tank, the upper
By subtracting the V ₀ from the total volume of the serial liquid tank, and obtains the liquid volume in the liquid tank, transport aircraft for fluid meter.