JPS6034261Y2 - Low temperature air supply device - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a low-temperature air supply device that supplies cold air with a low-temperature air composition.

In recent years, cold air has been used as a treatment for rheumatism or to cool cutting blades, cutting blades, etc. in machining.

Considering the cooling effect of these cold air, extremely low temperature is required.

For this reason, the use of cryogenic liquefied gases such as liquid nitrogen and liquid oxygen can be considered, but when using these liquefied gases, for example, liquid nitrogen, the nitrogen gas after use stays in the room, causing oxygen deficiency. This is unfavorable from an environmental sanitary standpoint, and liquid oxygen is unfavorable from a safety standpoint because the oxygen remains in the room after use and there is a risk of explosion.

Therefore, in general, the atmosphere is cooled with the liquefied gas to obtain cold air at a desired low temperature. However, as is well known, air in the atmosphere contains moisture, carbon dioxide, etc., and when cooled to a low temperature, these This causes the inconvenience of solidification and clogging of the inside of the pipe.

For this reason, not only is a device for removing impurities in advance and a heat exchanger for cooling the air required, but the current situation is that the vaporized gas used for cooling is wasted and emitted.

The present invention was proposed in view of the above-mentioned current situation. Oxygen and nitrogen are mixed into the air composition and this is cooled to produce low-temperature cold air. In this case, one of the components is a liquefied gas,
In this low temperature air supply device, the other component is prepared in a gaseous state, the liquefied gas is used as a cooling source, and the vaporized gas generated by cooling is used as one component gas of the air composition.

Its features include a filling pipe with a valve for filling the insulated storage tank with liquefied gas, which is insulated between the inner and outer tanks, and a vaporizer, pressure adjustment valve, and shutoff valve from the bottom of the inner tank to the inner ring of the inner tank. A pressurizing pipe that opens, a gas outlet pipe that is connected from the inner ring of the inner tank to a gas take-out valve via a heater, and a valve that is installed at the bottom of the inner tank with both ends outside the outer tank. Each system, such as cooling piping, is provided with cooling pipes connected to each other to form an adiabatic storage tank that serves as a source for air-composition gas cooling and air-composition gas as a one-component gas source. is filled with liquefied gas, and the valve at one end of the cooling pipe of the storage tank is connected to the outlet pipe of the mixer, and the gas outlet valve of the gas outlet pipe of the storage tank is connected to the single-component inlet pipe provided in the mixer. In addition, other components are introduced into the other component introduction pipe installed in the mixer, and the low-temperature cold air of the air composition is drawn out from the other valve of the storage tank's cooling piping and supplied to the user. be.

The device of the present invention will be explained in detail below with reference to the drawings.

In the figure, 1 is an adiabatic storage tank consisting of an outer tank 2 and an inner tank 3, and the space between the inner and outer tanks 4 is insulated, and 5 is a pipe filled with liquefied gas, which is connected to the inner tank via a filling valve 6. 3 Opens inside.

Reference numeral 7 denotes a pressurizing pipe which connects from the bottom of the inner tank 3 through the heat insulating layer 4 and into the upper space inside the inner tank 3 via a vaporizer 8, a pressure regulating valve 9, and a shutoff valve 10 provided facing the inner wall of the outer tank 2. It opens at 11.

Reference numeral 12 denotes a gas extraction pipe, and the pipe 12 is connected to the upper space 1 in the inner tank 3.
1 through a heat insulating layer 4 and connected to a gas extraction valve 14 via a heater 13 installed facing the inner wall of the outer tank 2.

15 is a cooling pipe provided near the bottom of the inner tank 3;
Both ends of the valves 16 and 17 are connected to external valves 16 and 17, respectively.

Note that 18 is a liquid level gauge that detects the amount of liquid in the storage tank, 19 is a pressure gauge that detects the pressure in the storage tank, 20 is a safety valve that operates when the pressure in the storage tank increases excessively, and 21 is the pressure in the cooler 15. This is a safety valve that operates if the temperature rises excessively.

In the device of the present invention, the above-described insulated storage tank 1 is filled with one of the component gases as a liquefied gas for producing a mixed gas of a desired composition, and this is connected to the mixer 101 as shown below. .

That is, the gas take-off valve 14 of the adiabatic storage tank 1 is connected to the mixer 101.
A component gas introduction pipe 105 and a pipe 106 are connected to each other via a valve 102, a pressure adjustment valve 103, and a flow rate adjustment mechanism 104.
A valve 16 connected to the cooling pipe 15 provided in the adiabatic storage tank 1 is connected to the mixed gas outlet pipe 1 from the mixer 101.
07 through a pipe 108.

An inlet pipe 109 for introducing the other component gas of the mixed gas into the mixer 101 is installed in the mixer 101 via a valve 110, a pressure regulating valve 111, and a flow rate regulating mechanism 112. , and a cylinder 113 filled with the other component gas is connected via a pipe 114.

The device of the present invention constructed as described above is operated as follows.

For ease of understanding, an example will be described in which a nitrogen component among the components is used as a liquefied gas, and the other oxygen component is used in a gaseous state.

First, the adiabatic storage tank 1 is separated from the mixer 101 and is filled with liquid nitrogen in the following manner at a production factory or the like.

That is, the filling valve 6 of the storage tank 1 is opened and the inner tank 3 is filled through the pipe 5.

At this time, in order to facilitate filling, it is preferable that the gas take-off valve 14 be opened so that the inside of the inner tank 3 is communicated with the atmosphere, and the outside valves are closed.

When liquid nitrogen is filled into the inner tank 3, the filling valve 6
Then, the gas take-off valve is closed, and the storage tank 1 is appropriately transported to the place of use, where it is connected to the mixer 101 in the manner described above.

Note that it is also possible to maintain the storage tank 1 connected to the mixer 101 without transporting it, transport liquid nitrogen using a tank truck, etc., and fill the storage tank 1 with liquid nitrogen for use. be.

After connecting in this way, when the shutoff valve 10 provided on the pressurizing pipe 7 of the insulated storage tank is opened, liquid nitrogen in the insulated storage tank is led out from the bottom through the pipe 7, vaporized in the vaporizer 8, and then passed through the pressure regulating valve 9. ,
It is led to the upper space 11 inside the inner tank 3 through the shutoff valve 10 and increases the pressure inside the inner tank 3.

Note that the pressure in the inner tank 3 is automatically operated to maintain the desired pressure by setting the pressure regulating valve 9 to a desired pressure.

When the pressure inside the inner tank 3 is raised to the desired pressure, the gas take-off valve 14 and the valves 16 and 17 provided at both ends of the cooling pipe 15 are opened, and the respective component gas introduction pipes 105 and 109 communicating with the mixer 101 are opened. Open the provided valves 102,110.

Then, the nitrogen gas maintained at a constant pressure in the upper space 11 in the storage tank passes through the gas take-off pipe 12, the warmer 13, and reaches almost atmospheric temperature, and then passes through the gas take-off valve 14 through the connecting pipe 106.
Nitrogen gas is introduced into an inlet pipe 105 communicating with the mixer 101 through a valve 102, a pressure regulating valve 103, and a flow rate regulating mechanism 104, and a constant flow rate of nitrogen gas maintained at a desired constant pressure is supplied to the mixer 101. be done.

Then, in the mixer 101, a separate gas cylinder 11 is added to the container 101.
3, the oxygen gas is uniformly mixed with oxygen gas that is supplied at a constant flow rate maintained at a constant pressure via the pipe 114, the introduction pipe 109, the valve 110, the pressure regulating valve 111, and the flow rate regulating mechanism 112.

The mixing composition ratio in the mixer 101 is determined by setting the set pressures of the pressure regulating valves 103 and 111 provided in the respective introduction pipes 105 and 109 to the same value, and adjusting the flow rate ratio of the flow rate regulating mechanisms 104 and 112 to a desired ratio. By doing so, the desired composition ratio can be easily obtained (oxygen:nitrogen=1:4 for air composition).

Further, the desired pressure can be obtained by setting the pressure regulating valves 103 and 111 to desired pressure values.

The desired oxygen/nitrogen/air composition mixed gas obtained in this way reaches the valve 16 via the outlet pipe 107 and the connecting pipe 108 from 101, and is then led to the cooling pipe 15 provided in the inner tank 3. It is cooled by the liquid nitrogen in the inner tank 3 through the pipe 15 and reaches the valve 17. From the valve 17, the cooled air composition mixture gas is supplied to the user as appropriate for use.

On the other hand, as a result of cooling the air composition mixed gas flowing through the cooling pipe 15, the liquid nitrogen is vaporized and retained in the upper space 11 in the inner tank 3, and is sequentially supplied to the mixer 101 from the gas extraction pipe to improve the composition of the mixed gas. used as an ingredient.

The above describes the case where oxygen and nitrogen are mixed into a mixed gas of air composition, and when this is cooled and supplied as cold air, the nitrogen component is liquid nitrogen and the oxygen component is gaseous. It is also possible to use liquid oxygen as liquid oxygen and gaseous nitrogen as the nitrogen component. In this case, the liquid oxygen may be filled into the adiabatic storage tank of the present invention.

Furthermore, it can also be used in the same way when other mixed gases are produced and used after being cooled.

As described above, the present invention provides a cooling pipe in the storage tank, and uses the liquefied gas in the storage tank as the cold to produce the cold air of the required air composition gas, and also uses it as the cold to generate the cold air. Therefore, the liquefied gas to be rawhide is transferred to a mixer connected to a gas inlet pipe for another component so that the vaporized gas can be discharged at room temperature and used as a component of the air composition gas. In addition to connecting to the inlet pipe, the gas outlet pipe from the mixer is connected to the cooling pipe, which eliminates the need for a separate cryogen or heat exchanger, reducing the amount of equipment required. Not only that, but also the vaporized gas of the liquefied gas produced as a cryogen can be effectively used as a component of the mixed gas, increasing the economic effect. It has the advantage of being extremely easy to use just by connecting it to a mixer.

[Brief explanation of the drawing]

The drawing is a system diagram showing one embodiment of the device of the present invention. 1 is a heat insulating storage tank, 2 is an outer tank, 3 is an inner tank, 4 is a heat insulating layer, 5 is a filling pipe, 7 is a pressurizing pipe, 8 is a vaporizer, 9 is a pressure regulating valve, 10 is a shutoff valve, 11 is an inner tank Tank upper space, 12 a gas extraction pipe, 13 a warmer, 14 a gas extraction valve, 15
16 and 17 are cooling pipes, 101 is a mixer, 102 is a valve, 103 is a pressure regulating valve, 104 is a flow rate regulating mechanism, 10
5 is a single component gas introduction pipe, 107 is a mixed gas outlet pipe, 10
9 is the other component gas introduction pipe, 110 is a valve, 111 is a pressure regulating valve, 112 is a flow rate regulating mechanism, and 113 is a gas cylinder.

Claims (1)

[Scope of utility model registration request] When oxygen gas and nitrogen gas are mixed at an air composition ratio and supplied at low temperatures, an insulated storage tank 1 for storing one of the components in a liquid state and a container 113 for storing the other in a gaseous state are provided. The storage tank 1 includes a liquefied gas filling system having a filling valve 6, a vaporizer 8, a pressurizing system having a pressure regulating valve 9, a gas outlet system having a gas release valve 14, and a cooling pipe 15.
A cooling system is provided, one end of which is connected to the supply system, and the other end is connected to the mixer 101, and the gas derivation system and the mixer 101 are connected to a pressure regulating valve 103 and a flow rate regulating mechanism 1.
04, and the gas container 113 is connected to the pressure regulating valve 111. Mixer 1 via flow rate adjustment mechanism 112
A low temperature air supply device characterized by being connected to 01.