JPH07280626A - Ultrasonic liquid level indicator - Google Patents

Abstract

PURPOSE:To provide an ultrasonic liquid level indicator which can detect the liquid level stably for a long term by embedding an ultrasonic oscillator in a holding case and inserting the oscillator into holes made on the opposite sides of a channel thereby sustaining a best contact state between the oscillator and the channel, i.e., a tube. CONSTITUTION:Holes for receiving an ultrasonic oscillator 3 are drilled from the right and left toward a central channel of a holding case 1 and a thickness favorable for ultrasonic wave is left immediately before the central channel. The oscillator 3 fixed with wires is then inserted into the right and left holes and secured in place through a filter 4 while pressing. Hard tubes for joining a liquid supply tube 2 are fixed to the upper and lower sides of the holding case 1. When the tube 2 is not cut off, it is passed through the case 1 with a space part being provided in the center. After the oscillator 3 is embedded in the case 1, a rubber ring 6 previously put on tube 2 is tightened by means of a screw 5. The tube 2 is then secured to the case 1 and the space part 7 filled with liquid is enclosed thus coupling the oscillator 3 acoustically through the liquid.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION The present invention relates to the level of chemicals,
It has a wide range of applications, such as checking for the presence or absence, monitoring blood circulation in the medical field, and detecting other lubricants, printing ink, running out of liquid, and detecting air bubbles.

2. Description of the Related Art Liquid detection using ultrasonic waves has been put to practical use in many fields. Among them, in order to detect the liquid in a thin tube, an ultrasonic transducer was applied from both sides with suitable oil or vaseline and pressed against it. Although this method is good at the beginning of wearing, the sensitivity of the tube often deteriorates as the elasticity of the tube decreases or peels off over time. There is a need for something that covers that drawback. Besides, it requires skill.

[0002]

In measuring the analog voltage of the ultrasonic wave transmissivity, it becomes inaccurate if there is a variable portion in the ultrasonic wave transmission system. The most significant influence is the contact state between the tube and the vibration element, and since it is sufficient for the flaw detector to be in good condition only during measurement, water or glycerin is applied. However, when it comes to automatic instrumentation, it must always serve its best. Water evaporates quickly, glycerin deteriorates and becomes hard,
Cracks. The holding container is ideal because the oscillator is sealed and fixed, and there is no room for air to intervene in acoustic coupling with the liquid to be measured.

[0003]

In order to solve the above-mentioned problems, the present invention does not require a high level of skill in installation, and the same effect can be obtained by anyone. The opposing ultrasonic transducers are connected to the liquid to be measured by a linear ultrasonic beam through the holding container. When the liquid enters the hollow liquid flow path, the sound wave penetrates because the density is higher than that of the air. The oscillator is fixed so that it is integrated in the container. Since the oscillator and the container are immediately acoustically coupled to the liquid to be measured, there is no room for air to enter. The second term,
There are times when I want to use it without stopping and cutting the tube. The liquid may accumulate at the connecting points of the tube, which may cause aging and / or the blood may solidify, which may cause problems. At that time, the tube is used by penetrating the container. Water or other liquid may be used as an acoustic medium between the transducers and the tube in the container. However, in order to maintain a good condition for a long period of time, it is necessary to keep it in a sealed state so as not to leak.

[0004]

Embodiments of the present invention will be described with reference to the drawings. Item 1 Ultrasonic waves are used to detect when liquid comes into the holding container (1). Therefore, the ultrasonic transducer (3) is embedded in the both walls with the filling material (4) across the flow path passing through the center. When there is no liquid, ultrasonic waves cannot pass through because the flow path is air. A hard cylinder for stopping the tube is inserted at the tip of the upper and lower flow paths of the holding container by expanding the tip of the tube.

The second method is a method of using the tube without cutting it. The tube may be frequently replaced due to dirt, dents, breaks, hardening, or cracks. At that time, it is used by penetrating the center of the holding container. Create a space (7) inside the middle of the container. This room is for sealing a liquid as a sound wave transmission medium. On the other hand, dig holes for accommodating the oscillator from the left and right sides of the outside of the container toward the center. Stop at the front leaving a thickness of 1 mm so as not to penetrate the space. Then, the vibrator to which the conductor wire has been soldered in advance is inserted into the hole, pushed into the inside of the hole, and fixed with the filling material. At the top and bottom of the holding container, attach a cylinder with nut screws so that the outer diameter of the rubber ring fitted with the tube fits inside. Separately from the main body, prepare a bolt screw that has two holes for passing tubes. In the tube,
There are various standard sizes. Also, rubber rings come in various sizes. It is advisable to fit a rubber ring that is about 0.3 mm thinner than the tube. This tube
If the fitted rubber ring is dropped into the inside of the nut through the holding container and tightened with a bolt, the gap between the tube and the container can be sealed. After sealing the lower part, the space is filled with water and then the upper part is sealed. The performance of the ultrasonic liquid surface thus created is always stable.

[0006]

As described above, the ultrasonic type liquid level gauge, which has been widely used in the past, cannot achieve stable performance for a long period of time without being familiar with its setting method. If the installed large equipment is distant, especially when it is exported to a foreign country, and if the performance does not return after exchanging it, it may be possible to escape the labor of dispatching overseas. It would be very advantageous if the holding container could be restored with simple instructions. This requires consideration at the molecular level for the binding during vibration transmission of the ultrasonic transducer. No matter how much pressure is pressed while iron rust fine powder is on it, there is no effect. It floats at the molecular level. However, dropping a few drops of water here will have an immediate effect. This is because the acoustic coupling was completed. The experience of the holding container is great from such an experience.

[0007]

[Brief description of drawings]

FIG. 1 is a schematic configuration diagram of claim 1 of the present invention.

FIG. 2 is a schematic configuration diagram of claim 2 of the present invention.

[Explanation of symbols]

 1: Holding container 2: Liquid feeding tube 3: Ultrasonic transducer 4: Filling material 5: Tightening screw 6: Rubber ring 7: Internal space

Claims (2)

[Claims] 1. In FIG. 1, above and below the holding container (1),
Attach a hard cylinder to join the liquid transfer tube (2). When the liquid is sent from below after the tube is attached, the liquid can be sent upward through the central channel of the holding container.
A hole for inserting an ultrasonic transducer is dug from the left and right toward the center channel toward the center channel of the holding container, and a thickness suitable for ultrasonic waves is left just before it is penetrated. Then, from both the left and right sides toward the center, insert the vibrator to which the electric wire is attached in advance, and fix with the filler (4) while pressing. A method for constructing a bonding interface between both transducers and the liquid to be measured. 2. When the tube is used by penetrating it without cutting it for the same purpose as in claim 1, the method of FIG. 2 is used. Pass the tube vertically in the holding container (1).
A space (7) is provided in the center of the container. In this space, the tube (2) is self-supporting without touching anything.
Similarly to the first aspect, a hole for inserting an ultrasonic transducer is dug from the left and right sides of the container toward the center, and a thickness suitable for ultrasonic waves is left just before piercing. Then, the vibrator is pressed from both the left and right toward the center and fixed with the filler (4). When attaching the tube, pass through the rubber ring (6) that applies a tightening force to the tube (2) in advance and pressurize with the tightening screw (5). Seal tightly. In this way, the internal space (7) created to be hermetically sealed
In the method, a medium liquid chamber for transmitting sound waves is provided between both transducers and a tube through which the liquid to be measured is filled, which is filled with liquid to create acoustic coupling.