JPS58223022A - Liquid level detecting method - Google Patents

Abstract

PURPOSE:To improve extensive usability, by detecting the position of a liquid level by the increase in internal pressure; when a gas is supplied into a tubular body, which has a gas supplying means and a gas pressure detecting means and is provided with a hole at the lower end, and the lower end approaches the liquid or it is contacted with the liquid. CONSTITUTION:A cylinder control part 10 is operated. A compressed gas is sent into a cylinder 7 from a cylinder gas supplying port 11. A piston 6 are a tubular body 4 are lowered by said pressure. At this time, the gas is exhausted from a lower end hole 3 and a gas pressure measuring hole 2 of the tubular body 4. The tubular body 4 is gradually lowered. When the lower end approaches the liquid or it is contacted with the liquid, the pressure that is applied to the hole 3 is increased. Therefore, the amount of the gas exhausted from the gas pressure measuring hole 2 is increased. The pressure of the gas exhausted from the measuring hole 2 is measured by a gas pressure detector 12. When said pressure becomes a preset value or more, the point is made to be the liquid level.

Description

[Detailed description of the invention] The present invention relates to a regular liquid level detection method.

This method is particularly suitable for detecting the level of A-temperature liquid such as molten liquid in a glass furnace.

Conventionally, it has been extremely difficult to detect the liquid level inside a furnace such as a glass melting furnace, which has a salinity of 6 degrees Celsius to over 1000 degrees Celsius, due to temperature characteristics. Judgment and discussion based on experience. However, such a method causes problems with the equipment and is unfavorable for the safety of the workers.
Recently, methods for scattering this have been developed, such as (1) detecting the liquid level using an electrode rod, (2) lowering a rope with a weight using a motor, and when the rope reaches the object to be measured. There are methods to measure the liquid level by mechanically detecting changes in the tension of the liquid. Method 1) uses a common electrode (installed deeper than the set level), a detection electrode (installed at the set level!), and a permanent electrode (installed at the same depth as the common electrode).
This method requires three types of power supply, and measures the liquid level based on the state of contact between each one and the liquid surface.This method is suitable for measurements in structures where the flow velocity is low, but when the flow velocity occurs, it becomes extremely difficult to measure the liquid level. This is not preferred as a measurement method in an environment where flow velocities occur because the position of the

In addition, in method (2), the rope with a heavy halberd must be made of a heat-resistant material, which is poor in versatility.

The present invention is a novel liquid level detection method that improves the above-mentioned drawbacks.The gist of the present invention is to use a node-like body with a hole at the lower end, which has a gas supply means and a gas pressure detection means near the upper part. The position of the elbow liquid level is detected by the increase in internal pressure when the lower end approaches or comes into contact with the liquid by lowering it while supplying it.
f: This is a special liquid level detection method.

Since the method of the present invention solves all of the above-mentioned problems, it is a particularly effective method for detecting the liquid level of crystal width liquids.

The cylindrical body used in the present invention, which is generally open at the lower end, is made of iron or other metal, and is sufficient.The cylindrical body has a gas supply means and a gas pressure control means near the upper part. It has a structure with a hole at the bottom end. As the gas supply means, any known means can be used as long as it has a mechanism for supplying gas at a constant pressure (flow rate) from the outside to the cylindrical body. Any known means can be used as long as it has a mechanism for detecting an increase in internal pressure when the lower end approaches or contacts the liquid by lowering the joint while supplying gas through the gas supply means.

The means for lowering the tube-like body is not particularly limited, but generally it is rolled with a hot dipper such as a wire, and a method is used in which the position of the tube-like body is determined by the amount of the wire being fed out. Representative examples will be explained below with reference to the drawings. 1st
In the figure, l is a gas supply port for supplying gas with p-gas to the gas supply means, O is a gas pressure measurement port connected to the gas pressure detection means, and 8 is a gas pressure measurement port that connects the gas inside the cylindrical body to the liquid level. It is an opening at the lower end for discharge. In this figure, the gas supply port and the gas pressure measurement port are provided separately, but they may be provided as one port that combines both ports as shown in FIG.

The knot-shaped body 4 is made of a known material and has a known shape.

For example, the material is a general-purpose metal material such as iron, stainless steel, heat-resistant alloy, etc., and the gas co-feeding port 1 and the gas pressure measuring port are installed near the top.

It can be arbitrarily selected depending on the cylindrical body, the gas supply port, the diameter of the gas pressure side leg port, the length t, the structure having the liquid level to be measured, the gas supply means, and the gas pressure detection means. Generally, the orifice of the open part 14 of the cylindrical body is constructed to be larger than the diameter of the gas pressure 11111 fixed day, but it is particularly preferable that the tip is shaped into a constricted nozzle as shown in FIG. As shown in FIG. 1, a preferred embodiment of the cylindrical body of the present invention is that the cylindrical body has a double-tube structure, and a refrigerant such as water is circulated through the outer tube 5. By doing this, even when measuring the liquid level of crystal mud liquid, there is no need to make a cylindrical body from heat-resistant alloy, and the iron shape can be made from general-purpose paulownia material, and moreover, it can be used at high temperatures. It is possible to efficiently prevent the phenomenon in which the liquid melted in the lv) adheres to the opening of the lv)-shaped body and causes it to become clogged.

As the gas supply means and gas pressure detection means used in the present invention, known means are used without particular limitation.

For example, as a gas supply means, a gas supply device and a gas supply port are connected together, and a flow meter (pressure Rt) is connected to the piping route.
A method of supplying an arbitrary flow seal while observing pressure fluctuations from the flow meter (pressure gauge). As a gas pressure detection method, a pressure side or a gas pressure intensifier for detecting gas from the gas pressure detection port 2 is used. In addition, as used in this defense, any material may be used as long as it does not have an adverse effect on the solution to be determined, but general ItC! J- It is preferable to use an inert gas such as air or various substances.

As for the means for lowering the above-mentioned knot-shaped body, any known method can be used without particular limitation. For example, as shown in FIG. 3, a cylinder 7 having a piston 6 inside is used, and the tip of the piston 6 and the upper part of the cylindrical body are connected via a guide rod 8. A method in which the cylindrical body 4 is linked to the movement of the piston 6 is preferably used. The cylinder used for this is either an air set or a hydraulic type, or an air set is generally used, and it is also preferable that a magnetic valve is used when supplying and exhausting compressed gas into the cylinder. It is.

The uninvented liquid level detection method uses the above-mentioned cylindrical body, lowers it while supplying gas inside, and detects the position of the Rji liquid level by the increase in internal pressure when the lower end approaches or touches the liquid. It is characterized by having a mechanism for detecting it, and its detection method is a known method (i
% can be used without restriction. Hereinafter, seven representative examples will be explained based on the drawings. Of course, the invention is not limited to this method.

Figure 1 is a schematic diagram showing a method for measuring the liquid level in a high-temperature furnace. Although this figure shows an embodiment in which the gas supply port and gas pressure measurement port are provided separately, it is also possible to use a common gas supply port and gas pressure measurement port to facilitate stirring.

A cylindrical body having a gas supply means and a gas pressure detecting means near the top and having a hole at the bottom end is inserted into the high temperature furnace from one point on the wall surface of the furnace. At this time, the installation position of the cylindrical body! 'Hagi 9
Any structure may be used as long as the V end of the cylindrical body can be placed outside the wall surface when not measuring the liquid level, or close to the liquid level when measuring the liquid level ft. Further, the shape and structure of the insertion opening through which the cylindrical body is inserted into the wall surface may be any structure as long as the cylindrical body can be moved and the liquid inside will not be scattered.

Measurements are made in the next step 11. That is, when the measurement interval timer 9 issues a signal to start measuring the liquid level at regular intervals, the piston 6 in the cylinder 7 descends in order to lower the cylindrical body 4. This operation is performed by the syringe control unit 10. That is, when No. 11 is emitted under the p1 cylindrical body 4 by the measurement interval timer 9,
Schilling-control unit IO operates and Schilling-gas supply port 1
1, compressed gas is fed into the cylinder 7, and the piston (5) is lowered by the pressure.At the same time, the piston 6 and the cylindrical body 4 are connected by a guide rod 8, so the cylindrical body 4 At this time, in the cylindrical body 4, gas flows from the girth supply port through the flow rate (pressure) meter 13 to a constant flow rate (pressure).
The gas is supplied through the opening 8 at the bottom end and the gas pressure measuring port 2.

Since the diameter of the gas pressure measurement port 2 is designed to be smaller than that of the aperture 3, most of the gas is discharged through the aperture 3. Only the pressure loss (usually ≒ 0) is discharged.

However, when the cylindrical body 4 is gradually lowered and the lower end approaches or contacts the liquid, the pressure applied to the opening 3 increases, and the amount of gas exhausted from the gas pressure measurement port 2 increases, and accordingly, the gas pressure measurement port 2, the pressure of the gas discharged increases. A gas pressure detector 12 or the like is connected to the gas pressure measurement port 2 to measure the gas pressure exhausted from the measurement port 2, and when the gas pressure exceeds a predetermined set value, the gas pressure detector 12 is activated and sends a piston lift signal to the cylinder control section 10, and at the same time a signal for holding the position of the cylindrical body is issued. After that, the piston inside the cylinder rises, and at the same time the cylindrical body also rises, waiting until the next measurement.

In the method of the present invention, the liquid level is detected by holding the position of the cylindrical body, and the position holding is measured as follows. That is, the upper end of the cylindrical body 4 is connected by a pulley 14, and the end 1 of the pulley has a volume resistance measuring part 15 that changes according to the movement of the piston 6, and measures the resistance and calculates the skeleton resistance value. The changing section 16 changes the resistance for viewing purposes and sends the changed value to the hold amplifier 17. Through this series of controls, the liquid level can be detected. How to control each part or equipment &! It is not particularly limited.

For example, when detecting the position (for example, it is also possible to use a delium resistor, a resistor, a return air type, etc.
By doing so, the liquid level can also be controlled.

In addition, in the present invention, if the lower opening of the cylindrical body is clogged with unmelted material in the furnace, it is necessary to clean the cylindrical body. If the upper part of the body has a structure that is normally airtight, and there is something attached to it, you can manually remove it by inserting a stick into the upper part of the body, or as shown in Figure S. is provided in a separate table, and the rod 21 for removing deposits inside the cylindrical body 4 is connected to the piston 20 in the cedar cylinder 19, and the cylinder
There are two methods, such as a method of interlocking the rod 21 in the cylindrical body 4 to remove the deposits by controlling 19, and a method of removing the deposits by controlling the gas pressure inside the cylindrical body. Any known method can be used without any particular restriction as these Control@1 methods.

[Brief explanation of the drawing]

FIG. 7 is a front view showing the structure of a cylindrical body with a hole at the lower end, which has a gas supply means and a gas pressure detection means near the upper part and is used in the present invention, and FIG. 2 shows another embodiment of FIG. A front view of a cylindrical body having a double pipe structure, and FIG. 3 is a stop IR1 view of a part of the sill for lowering the cylindrical body. FIG. 7 is a schematic diagram showing the method of the present invention, and FIG. S is a schematic diagram of a liquid level detector having a mechanism for removing deposits inside the cylindrical body. In the figure, 1 is a gas supply port, 2 is a gas pressure measurement port, 8 is a cylindrical body, the opening 4 is a cylindrical body, 5 is an outer tube, 6 is a piston, 7 is a cylinder 18 is a guide rod, 9 is a measurement interval timer,
1OFi cylinder/-fftllll [B, 11 is cylinder gas supply port, 12 is gas pressure detector, 18 is flow rate (pressure) meter, 14 is Gooley, 15 is Gerium resistance measuring section,
16 is a voltage conversion section, 17 is a hold amplifier, 181,
indicator or controller; 19 is a cylinder; 20 is a piston;
21 is a stick removing rod. Patent Applicant Tokuyama Amedatsu Co., Ltd. 11 Figure 't, 2 Figure VJ 3 Figure 4 Mouth Δ

Claims (1)

[Claims] (1) A cylindrical body with a hole at one F end, which has a gas supply means and a gas pressure detection means near the top, is used, and this is
A liquid level detection method whose mission is to detect the position of the liquid level by lowering it while supplying ff gas and detecting the position of the liquid level by the increase in internal pressure when the lower end approaches or contacts the liquid.