JPS61191921A - Automatic replenisher - Google Patents

Abstract

PURPOSE:To enable automatic replenishment of the optimum amount of a fluid object without being affected by environmental conditions and the state of the fluid object, by detecting changes in the amount of the fluid object in a container depending on variations in the cavity resonance frequency to open or close a control valve for replenishing. CONSTITUTION:For example, a sensor 5 comprising a sound emitting section 3 and a sound collecting section 4, a feed tube 6 and a control valve 7 are provided on the top of a container 1 holding a fluid object 2 such as liquid nitrogen to construct a container section 10 while a control section 20 is provided which comprises a control valve driving sector 11, a sound emission driving sector 12, a sensor amplifying sector 13, a frequency selecting sector 14, a point A/B frequency generating sector 15 and a decision sector 16. Then, as the amount of the fluid object 2 approaches the lower limit A, the cavity resonance frequency generated in the container 1 lowers gradually and the frequency of the cavity resonance voltage is selected with a frequency selecting sector 14, the output of which is compared with the point A resonance frequency to be inputted from the point A/B frequency generating sector 15 by the decision sector 16. When they coincide, the control valve 7 is opened to fill a charge 2 and then, closed when the upper limit B is reached.

Description

Detailed Description of the Invention [Summary] The automatic replenishment device according to the present invention is a method for controlling the amount of fluid contained in a container, in which the cavity resonance frequency of the sound wave in the container changes depending on the amount of contained material. Focusing on
The present invention is characterized in that a control valve drive unit that opens and closes a valve for replenishing fluid is configured to operate in synchronization with the cavity resonance frequency.

[Industrial application field]

The present invention relates to improvements in means for managing the amount of fluid filled in a container, and more particularly to an automatic replenishment device having a structure in which the upper and lower limits of the amount of fluid are detected by changes in cavity resonance frequency. Regarding.

[Conventional technology]

Conventionally known methods for controlling the amount of fluid filled in a container include (1) float method, (2) semiconductor detection method, and (2) insulation degree detection method.

The operating principles and characteristics of each of these methods are as follows.

■Float method A float floating on the liquid surface moves up and down depending on the amount of fluid, and when the float falls below a certain level, the fluid is replenished into the container and A method that stops replenishment when a fixed amount is reached.

Advantages: (1) It is a generally known method and is easy to maintain.

Disadvantages: (1) If the fluid to be accommodated is at an extremely low temperature, such as liquid nitrogen, the components will freeze and become inoperable.

(2) If the fluid to be accommodated has a high viscosity, the operation becomes uncertain.

■Semiconductor detection method This method utilizes the fact that the resistance value of a semiconductor changes depending on the temperature change between when the semiconductor is in the air and when it is immersed in a fluid. A method in which the location of a fluid object is detected based on whether or not it makes contact.

Advantages = (1) The configuration is relatively simple.

Disadvantages: (1) There are problems with the aging of the sensor section and the operating temperature range.

■Insulation degree detection method A method that takes advantage of the fact that the degree of insulation is different in the air and in fluids. (Advantages and disadvantages are almost the same as those in case ① above, so detailed explanations are omitted.) As is clear from the above, each of the conventional methods requires that the fluid be in a liquid state with low activity and not be at an ultra-low temperature. However, there were operational constraints.

[Problem that the invention seeks to solve]

The present invention has been made in order to correct the problem with the conventional method, that is, the accuracy of detecting the amount of contained material is affected by environmental conditions and the state of the fluid in the container.

[Means for solving problems]

The above-mentioned problems are solved by the automatic replenishment device for fluid according to the present invention, which opens and closes the replenishment valve by detecting a change in the volume within the container, that is, the amount of the filling material, by a change in the cavity resonance frequency.

[Effect]

The present invention improves the amount of fluid in a container by synchronizing the cavity resonance frequency generated by the sound wave emitted from the sounding body in the container and the operation of a control valve drive unit that opens and closes a control valve that replenishes the fluid into the container. is automatically controlled.

〔Example〕

The figure is a side sectional view showing an embodiment of the present invention.

As shown in FIG. In order to
A container part 10 is provided with a supply pipe 6 and a control valve 7 for supplying the water, and a control part 20 is provided with a control valve drive part 11 that opens and closes the control valve 7 in synchronization with the sensor 5. .

The control unit 20 controls a sound generation drive unit 1 which is a drive source for the sound generation unit 3.
2, a sound collection section 4 that converts the cavity resonance wave generated by the sound wave emitted from the sound generation section 3 into voltage, a sensor amplification section 13 that amplifies the input voltage from the sound collection section 4, and a sensor amplification section 13 that amplifies the input voltage from the sound collection section 4; A frequency selection unit 14 that performs frequency selection, a point A point B frequency generation unit 15 that generates each resonance frequency when the amount of the fluid 2 reaches the lower limit value A and the upper limit value B, and A determination unit 16 is provided which compares and determines the input with the input from the frequency selection unit 14 and provides a valve opening signal to the control valve drive unit 11 when the frequencies match.

The operating principle of the present invention will be explained below with reference to FIG.

Sound waves are emitted from the sound generating section 3 installed at the top of the container 1, and a cavity resonance wave corresponding to the effective volume is generated inside the container 1.

As the amount of the fluid object 2 approaches the lower limit point A, the cavity resonance frequency within the container 1 gradually changes in the direction of decreasing.

The above-mentioned cavity frequency is captured by the sound collection section 4, converted into a voltage, and amplified by the sensor amplification section 13.

The frequency selection section 14 selects the frequency of the cavity resonance wave voltage, and the determination section 16 selects the frequency of the cavity resonance wave voltage from the frequency selection section 14 and the point A resonance frequency manually inputted from the point A point B frequency generation section 15. A comparison is made, and if the frequencies match, a valve closing signal is given to the control valve drive unit 11 and the control valve 7 is opened.

When the control valve 7 is opened, the fluid 2 is filled, and when the upper limit point B is reached, the determination unit 16 is set to B based on the above operating principle.
A comparison is made with the cavity resonance wave voltage at the point, and a valve closing signal is given to the control valve driving section 11, so that the control valve 7 is closed.

〔Effect of the invention〕

In this way, this device arbitrarily determines the upper and lower limits of the fluid object 2, and by setting the cavity resonance frequency at each point A and B in the container in advance, the remaining amount of the fluid object can be accurately confirmed.
It has a structure that allows automatic replenishment of the optimal amount. Therefore, if applied to control the liquid refrigerant in the dewar of an infrared detector, it is effective in maintaining a uniform cooling temperature and preventing fluctuations in detection characteristics.

Furthermore, since the automatic replenishment device according to the present invention has a structure that detects changes in volume by changes in the cavity resonance frequency, it can be applied not only to liquids but also to single particles of powder, etc., and can control the amount contained with extremely high precision. This is a great effect.

[Brief explanation of the drawing]

The figure is a side sectional view showing one embodiment of the present invention. In the figure, 1 is a container, 2 is a fluid object, 3 is a sound generating section, 4 is a sound collecting section, 5 is a sensor, 6 is a supply pipe, 7 is a control valve, IO is a container section, 11 is a control valve drive section, 12 Reference numeral 13 indicates a sound generation drive section, 13 indicates a sensor amplification section, 14 indicates a frequency selection section, 15 indicates an A point B point frequency ordering section, 16 indicates a determination section, and 20 indicates a control section.

Claims (1)

[Claims] An automatic replenishment device comprising a sensor that detects the amount of fluid in a container and a fluid replenishment control section that operates in synchronization with the sensor, the sensor comprising a sound generation section and a sound collection section. The amount of the fluid object is detected by a change in the cavity resonance frequency of the sound wave emitted from the sound generating section, and the fluid object supply control section detects the amount of the fluid object at a lower limit and an upper limit of the fluid object detected by the sensor. An automatic replenishment device comprising a control valve drive unit that opens and closes a replenishment control valve.