KR102136007B1 - Liquid nitrogen auto supply device using mass sensor - Google Patents

Abstract

The present invention relates to a liquid nitrogen automatic supply device using a mass sensing means.
The present invention is a liquid nitrogen automatic supply device for allowing liquid nitrogen, which is a cryogenic fluid stored in the storage tank 100, to be supplied to the outside in a stabilized state after being transferred to a supply container through a pipe, the storage tank 100 The liquid nitrogen supplied from the control tank 200 can be supplied to the supply container 300 in a stabilized state in which thermal equilibrium is maintained through the first mass sensing means L1 installed in the control tank 200, and the supply container 300 After the liquid nitrogen introduced into the supply container 300 is sensed in a stabilized state through the second mass sensing means L2 installed in the supply container 300, it can be automatically supplied to the user.
The present invention has an advantage in that liquid nitrogen stored in a storage tank can be supplied to a supply container in a liquid state that maintains thermal equilibrium with the piping to supply liquid nitrogen in a fast and stable state.

Description

Liquid nitrogen auto supply device using mass sensing means and supply method {Liquid nitrogen auto supply device using mass sensor}

The present invention is for automatically supplying ultra-low temperature liquid nitrogen, and more specifically, it is used after confirmation of liquid nitrogen in a cryogenic state for supplying a use from a storage tank to a liquid state through mass sensing means and stabilization of thermal equilibrium. It relates to a liquid nitrogen automatic supply device and a supply method using a mass sensing means to be supplied to the supply container for supply.

Cryogenic fluids include liquid nitrogen (-196℃ at boiling point atmospheric pressure), liquid oxygen (-185℃ at boiling point atmospheric pressure), liquefied natural gas (-165℃ at boiling point atmospheric pressure), and various fluids in a cryogenic state. There is a tendency to become.

Liquid nitrogen is a by-product generated in the process of cooling the air to obtain liquid oxygen, and is characterized by a very low price. Unlike LNG or LPG, liquid nitrogen itself does not emit energy while directly burning, but rather cryogenic heat. It is a medium.

Also, it has a fairly large latent heat of evaporation, which vaporizes by taking 4765 cal of heat per gram at -196°C under atmospheric pressure, and its specific gravity is 0808, and the liquid nitrogen with a weight of 1 kg is about 124 liters.

As described above, liquid nitrogen is very inexpensive and accommodates a fairly large amount of cold and heat energy, but the rate of evaporation in contact with the atmosphere is very slow, and thus it has not been properly utilized to date.

In order to use the cryogenic liquid including such liquid nitrogen, a piping and a valve are connected to a storage tank to be used. Before using, the cryogenic liquid and the facilities such as the piping and the valve must be at a temperature equilibrium to allow the cryogenic liquid to flow.

That is, until the temperature of the cryogenic liquid and the temperature of the piping and valves become the same temperature, the cryogenic liquid continues to be converted into a gas, and this process is called cooling down.

In order to use the cryogenic liquid of the above-described process, cooling proceeds until a temperature equilibrium is achieved, and a wait occurs during this time.

And, as a method of confirming the fact that the cooling trial has ended, there is a method of confirming the liquid and the gas. At this time, the outflow of the gas has not yet achieved temperature equilibrium, and the flow of the liquid has achieved the temperature equilibrium.

Looking at the technique of distinguishing and detecting the cryogenic liquid and the cryogenic gas from the conventionally used technology, a method of using a differential pressure sensor of a temperature difference using a temperature sensor, a method of measuring the height of a liquid using a buoy, a method of using an electronic distance sensor, etc. There is, and a method using a differential pressure sensor is widely used.

The advantage of the method using the differential pressure sensor is that the price is low, but the measurement error is large and the zero point must be newly adjusted each time the differential pressure sensor is mounted.

This conventional technique is to install and use the ultra-low temperature liquid from the storage tank to the supply container, which is a use facility, but also has the following problems.

first; There is a problem in that a long time must be waited while the pipe is cooled until the temperature is balanced with the liquid before the liquid comes out.

second; There is a problem in that the pressure is increased by the vaporized gas and a lot of exhaust gas is generated until the liquid comes out, thereby polluting the indoor air.

third; Even if the liquid comes out, there is a problem in that it is difficult to receive the liquid due to high pressure and scattering of the cryogenic liquid.

fourth; There is a problem in that the cryogenic liquid is vaporized to contaminate indoor air with gas, and the liquid supplied at high pressure is scattered, threatening the safety of the user.

KR 10-0395596 Announcement date 2003. 08. 25 KR 10-1092388 Announcement date 2011. 12. 09 KR 10-2011-0085691 Publication date July 27, 2011 KR 10-2017-0042753 Publication date 2017. 04. 19

In view of this, the present inventors have considered the limitations and problems of the technique of transferring the existing cryogenic liquid while comprehensively considering the above-mentioned matters, and the liquid nitrogen stored in the storage tank maintains the thermal equilibrium with the piping. It can be supplied to the supply container to promote the effect of supplying liquid nitrogen in a fast and stable state, as well as a technology that can quickly and easily supply liquid nitrogen in a cryogenic state.

A) Minimize the waiting time for users to use cryogenic liquids,

B) Prevent indoor air pollution by gas gas generated during supply,

C) Stabilize the pressure of the cryogenic liquid to low pressure automatically,

D) The objective is to develop a device that increases the user's safety from the dangers of cryogenic liquids, and the present invention was invented as a result of continual research through intensive efforts to develop it.

Therefore, the technical problem and object to be solved by the present invention is to provide an automatic liquid nitrogen supply device using a mass sensing means.

Here, the technical problems and objects to be solved by the present invention are not limited to the technical problems and objectives mentioned above, and other technical problems and objectives not mentioned will be clearly understood by those skilled in the art from the following description.

Specific means according to the implementation of the present invention for achieving the above object and solving technical problems,

By determining the gas and liquid using the mass difference between the gas and the liquid at a constant volume, and controlling the valve based on the pressure and mass values,

a. Automatically detects when the cryogenic liquid is ready after the cooling procedure is over.

b. Automatically detects the amount of cryogenic liquid,

c. By automatically adjusting the pressure of the liquid

The user can use the cryogenic liquid immediately or at all times, and develop equipment to safely supply the cryogenic liquid at low pressure.

for teeth,

In the liquid nitrogen automatic supply device for allowing the liquid nitrogen, a cryogenic fluid stored in the storage tank, to be supplied to the outside in a stabilized state after being transferred to the supply container through the pipe,

The liquid nitrogen supplied from the storage tank is supplied to the supply container in a stabilized state in which thermal equilibrium is maintained through the first mass sensing means installed in the control tank, and the liquid nitrogen introduced into the supply container is installed in the supply container. 2 It is intended to implement a device that can be supplied after being detected in a stable state through a mass sensing means.

The present invention, provided with means and configurations for achieving the above objectives and solving technical problems, enables rapid and stable stabilization by allowing liquid nitrogen stored in a storage tank to be supplied to a supply container in a liquid state maintaining thermal equilibrium with the piping. It has the advantage of supplying liquid nitrogen in the state, minimizing the waiting time for the user to use the cryogenic liquid, preventing indoor air pollution by gas gas generated during supply, and stabilizing the pressure of the cryogenic liquid to automatic low pressure It has the advantage of increasing the user's safety from the danger of cryogenic liquids.

Here, the effects of the present invention are not limited to the above-mentioned effects, and other effects not mentioned will be clearly understood by those skilled in the art from the description of the claims.

1 is a block diagram of a liquid nitrogen automatic supply device using a mass sensing means according to the present invention,
FIG. 2 is a flow chart showing a process of supplying liquid nitrogen through an automatic supply of liquid nitrogen using the mass sensing means according to FIG. 1.

Hereinafter, embodiments of the present invention will be described in more detail with reference to the accompanying drawings.

Prior to this, terms to be described later are defined in consideration of the functions in the present invention, which clearly indicates that they should be interpreted in terms of concepts consistent with the technical spirit of the present invention and commonly recognized or commonly recognized in the art.

In addition, if it is determined that a detailed description of known functions or configurations related to the present invention may obscure the subject matter of the present invention, the detailed description will be omitted.

Here, the accompanying drawings are exaggerated or simplified for a convenience and clarity of description and understanding of the structure and operation of the technology, and it is revealed that each component does not exactly match the actual size and shape.

In addition, the term and/or in the present specification is meant to include a combination of a plurality of related described items or any one of a plurality of related described items, and when a part includes a certain component, this is a particularly opposite description. It does not mean that other components are excluded as long as there is no other component.

That is, it means that a feature, number, step, operation, component, part, or combination thereof described in the present specification exists, and one or more other features or number, step operation component, part, or combination thereof. It should be understood that it does not exclude the possibility of the existence or addition of things.

The present invention relates to an automatic supply device for liquid nitrogen to allow liquid nitrogen, which is a cryogenic fluid stored in a storage tank, to be transferred to a supply container through a pipe in a thermal equilibrium state and then supplied to the outside under a preset stabilization condition.

The present invention by the illustration of Figure 1, the storage tank 100 for storing liquid nitrogen, which is a cryogenic fluid, and confirming whether the inflowing liquid nitrogen is in a gas state or a liquid state, discharges gas and supplies a stabilized liquid nitrogen Control vessel 200 having a first mass sensing means (L1) and a supply container for supplying liquid nitrogen to the user when it is confirmed that the liquid nitrogen in the flowing liquid state is liquid through the second mass sensing means (L2) It is configured to include 300.

The piping includes a liquid nitrogen supply pipe 12 connecting the control tank 200 from the storage tank 100, and a gas discharge pipe for discharging gases in the control tank 200 and the supply container 300 to the outside. 22) (32), the control tank 200 and the supply container 300 to connect the liquid nitrogen transfer pipe 24 for transporting liquid nitrogen, the liquid supplying the liquid nitrogen of the supply container 300 to the place of use Refers to the nitrogen discharge pipe 34.

Here, in constructing the pipe, a method of making a pipe loop or connecting a flexible metal hose to the pipe is used.

In addition, electronic valves V1, V2, V3, V4, and V5 for supply, discharge, and transfer are respectively installed in the pipes.

That is, the valve (V1) is installed in the liquid nitrogen supply pipe 12 is opened and closed according to the signal value of the control unit 400, the valve (V2) is installed in the liquid nitrogen transfer pipe 24 according to the signal value of the control unit 400 The valve V3 is installed in the gas discharge pipe 22, and the valve V4 is installed in the gas discharge pipe 32 to be opened and closed according to the signal value of the control unit 400. In addition, the valve V5 is installed in the liquid nitrogen discharge pipe 34 to supply and close it to the place of use according to the signal value of the control unit 400.

The first and second mass sensing means (L1) (L2) is a weight sensor for measuring the weight and outputs to the control unit 400 by measuring the weight of the control tank 200.

The control unit 400 receives the sensing value of the weight sensor and compares it through a preset comparison value to automatically operate the valves V1 to V5.

When the liquid nitrogen, which is the cryogenic fluid stored in the storage tank 100 through the above configuration, is transferred to the supply container 300 through the pipe, the automatic transfer of liquid nitrogen to be supplied to the outside in a stabilized state will be described below. same.

Referring to FIG. 2, first, a liquid nitrogen supply step (S1) of supplying liquid nitrogen stored in the storage tank 100 to a supply container 300 for use in a valve V1 operation is performed. Then, the liquid nitrogen transferred through the opening of the valve V1 flows into the control tank 200 first, and at this time, a weight sensing step (S2) in which the weight sensor of the first mass sensing means S1 senses the weight by sensing Will perform. Subsequently, the control unit 400 performs a first comparison step S3 of determining whether it is in a liquid state or a gas state by comparing and analyzing the weight value of the sensed control tank 200 and the previously input weight value. Thereafter, when the signal value detected in the first comparison step (S3) is in the gaseous state, the valve V3 of the gas discharge pipe 22 is turned on to discharge, and when the detected signal value is in the liquid state, the liquid discharge pipe 24 By operating the valve (V2) of the valve to perform a valve selection step (S4) to transfer the liquid nitrogen in the liquid state to the supply container (300). When the liquid nitrogen in the liquid state flows into the supply container 300 through the valve selection step (S4) in a continuous operation, the second mass sensing means (L2) detects the weight and compares it with a preset weight value to stabilize After performing the second comparison step (S5) to determine whether it is liquid nitrogen, in the case of the stabilization state in the second comparison step (S5), by operating the valve (V5) on the liquid nitrogen discharge step to supply liquid nitrogen ( S6) is performed.

On the other hand, the present invention is not limited by the above-described embodiments and the accompanying drawings, and can be variously modified and applied in various ways that are not exemplified without departing from the scope of the technical spirit of the present invention. It is apparent to those of ordinary skill in the art to which the present invention pertains that the present invention may be broadly applied by changing it to other equivalent embodiments.

Therefore, contents related to modifying and applying the technical features of the present invention should be interpreted as being included within the technical spirit and scope of the present invention.

L1: first mass sensing means L2: second mass sensing means
V1~V5: Valve
12: liquid nitrogen supply pipe 22,32: gas discharge pipe
24: liquid nitrogen transfer pipe 34: liquid nitrogen discharge pipe
100: storage tank
200: control tank
300: supply container
400: control

Claims (4)

In the liquid nitrogen automatic supply device for allowing the liquid nitrogen, a cryogenic fluid stored in the storage tank, to be supplied to the outside in a stabilized state after being transferred to the supply container through the pipe,
In accordance with a valve on/off operation, a first mass sensing means is installed in a control tank configured to supply liquid nitrogen of the storage tank through a gas supply pipe and discharge gas through a gas discharge pipe, thereby maintaining the supply container in a stable state in which thermal equilibrium is maintained. To be supplied with
After the valve is turned on/off, a second mass sensing means is installed in the supply container in which the liquid nitrogen discharge pipe for discharging gas through the gas discharge pipe and supplying liquid nitrogen to the place of use is installed, and the liquid nitrogen introduced is stabilized. Automatic supply of liquid nitrogen using a mass sensing means characterized in that it can be automatically supplied to the place of use.
According to claim 1,
The first mass sensing means,
It is a weight sensor that senses the weight of the control tank and outputs the mass of liquid nitrogen.
The second mass sensing means,
Automatic supply of liquid nitrogen using a mass sensing means, characterized in that it is a weight sensor for sensing the weight of the supply container and outputting the mass of liquid nitrogen.
According to claim 1,
In the control tank and the supply container,
Automatic supply of liquid nitrogen using a mass sensing means, characterized in that a liquid nitrogen transfer pipe for transferring liquid nitrogen to the supply container according to the valve on / off operation is installed.
In the method for automatically supplying liquid nitrogen to allow liquid nitrogen, which is a cryogenic fluid stored in a storage tank, to be supplied to a supply container through a pipe to be supplied to the outside in a stabilized state,
A liquid nitrogen supply step (S1) of supplying liquid nitrogen stored in the storage tank to a control tank in a valve-on operation;
A weight sensing step (S2) of sensing liquid nitrogen supplied through the liquid nitrogen supply step into the control tank with a weight sensor of the first mass sensing means;
A first comparison step (S3) of determining whether it is in a liquid state or a gas state by comparing and analyzing the weight value of the sensed control tank and the weight value previously input to the control unit;
When the signal value detected in the comparison step is in the gaseous state, the valve is selected by operating the valve of the gas discharge pipe on and discharged, and when the detected signal value is in the liquid state, the valve of the liquid discharge pipe is activated to be transferred to the supply container. (S4);
When the liquid nitrogen in the liquid state is introduced into the supply container through the valve selection step, the second mass sensing means senses the weight and compares it with a preset weight value to determine whether it is a stable nitrogen liquid (S5). ;
Automatic stabilization method of liquid nitrogen using a mass sensing means characterized in that in the stabilization state in the second comparison step, a liquid nitrogen discharge step (S6) is performed to turn on the valve to supply liquid nitrogen.

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