JPS5849759B2 - Inert liquefied gas quantitative addition method and device - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention uses liquefied nitrogen gas LN as an inert gas in a can.
This invention relates to an inert liquefied gas quantitative addition method button for adding and filling 2 or liquefied carbon dioxide gas LCO2, and an apparatus directly used for carrying out the method.

In response to the urgent need for resource and energy conservation in recent years, inert liquefied gas is added and sealed inside the can, and the vaporization and expansion of the inert liquefied gas creates a positive pressure inside the can, creating a reinforcing effect and reinforcing the can container. Attempts have been made to reduce costs by thinning the walls and reducing materials, and at the same time to improve quality by reducing the amount of enclosed oxygen, which causes negative effects such as poor quality (tZ, deterioration, etc.) during addition, filling, and sealing.

However, the applicant has already filed a patent application for this type of device in 1973.
The invention related to No. 5-12072 has been filed, but as shown in Fig. 1, there is a central tank 1 that stores liquefied nitrogen gas LN2 for addition in the center, and a central tank 1 that stores liquefied nitrogen gas LN2 for insulation at the outer periphery.
The inside has a concentric three-layer structure surrounded by an intermediate tank 2 and an outer tank 3, each of which seals an insulating vacuum atmosphere Va, and the lower end is formed in a constricted shape, and the outer periphery is surrounded by the protruding lower end of the intermediate tank 2. A fixed volume dispenser nozzle 8 can be attached and detached at the center of the lower end of a sealed tank A in the form of a hot bar or funnel in appearance, in which the chambers 4 are respectively defined and the upper end is closed by a top plate 5 and the lower end is closed by a bottom plate 7 attached to an annular plate 6. A liquefied gas passage opening/closing valve mechanism B for addition, which is screwed down and attached to the bottom end of the central tank 1, and a vaporized gas flow rate adjustment angle valve 9 for feeding the vaporized nitrogen gas GN2 in the intermediate tank 2 into the gas chamber 4. Since the structure includes a cooling gas guide pipe 10, control for opening the addition liquefied gas passage opening/closing valve mechanism B and delivering a fixed amount of addition liquefied nitrogen gas LN2 from the quantitative liquid output nozzle 8 is performed by the central tank 1. Due to the dependence on the pressure adjustment of the vaporized nitrogen gas GN2 in the head space (H.S) of the head space (H.S), it will be ejected vigorously in response to the constant pressure, and the quantitative drop rate from the quantitative liquid ejection nozzle 8 will be reduced. However, if the additive liquefied nitrogen gas LN2 is dropped directly into the can, the discharge speed from the quantitative liquid discharge nozzle 8 is fast, so it collides with the liquid level inside the can and scatters outside the can, eventually impairing quantitative performance. result in loss.

The present invention solves the drawbacks of the above-mentioned device, and makes it possible to control the quantitative addition of an inert liquefied gas by preventing scattering on the surface of the liquid while almost maintaining the quantitative performance of dripping from the quantitative liquid output nozzle. The purpose is to provide buttons and devices.

An embodiment of the apparatus of the present invention for adding liquefied nitrogen gas LN2 will be described with reference to FIG.

The inert liquefied gas quantitative addition device X of the present invention is fixed to a sealed tank A having substantially the same structure as shown in FIG. Support holder 14 screwed into fixed fixing nut 13
an additional liquefied gas passage opening/closing valve mechanism B which is attached to hang down by penetrating the fixing liquid outlet nozzle 8 in a detachable manner; and a cooling gas guide pipe 10 which sends vaporized nitrogen gas GN2 in the intermediate tank 2 into the gas chamber 4. In the configuration similar to that shown in FIG. 1, a screw nut 15 and an embedded port 16 are attached to the ring plate 6 via a spacer 17 to define and close the gas chamber 4 on the lower surface of the edge of the central opening 18 of the bottom plate 7. A support holder is provided with a central vertical hole 2o into which the lower part of the quantitative liquid ejection nozzle 8 is inserted, and vertical holes 21 and 22 are respectively inserted through the central vertical hole 20 with the central vertical hole 20 inserted, while the mounting nut 19 is fixed so as to match. 23 into the mounting nut 19 from below until it reaches the outer periphery flange 24, and
A relay tube 26 is attached to the threaded enlarged diameter lower opening 25 of the central vertical hole 20.
Screw together the upper part of the outer periphery with the screw cut 27, and connect the relay tube 26 to the other side.
The threaded outer circumferential upper part of the pressure erasing nozzle 29 is screwed into the threaded lower diameter reducing opening 28 and hangs down, and the addition conductor 3o fixed and protruding from the tip of the pressure erasing nozzle 29 is passed through along the axis. The female threaded part 33 at the upper circumferential end of the vaporizing gas cylinder 32 with the blower outlet fitting 31 screwed onto the lower end is screwed into the male threaded part 34 at the lower end outer periphery of the support holder 23, with the pressure erasing nozzle 29 accommodated in the cylinder. It has a structure in which the vaporizing gas cylinders 32 are placed vertically against each other.

As shown in FIGS. 3 and 4, the pressure eliminating nozzle 29 has a lower portion formed with a Taber surface 29b on the outer periphery, and is made of a porous material made of sintered alloy and having a liquid permeability with a hole diameter of 2 to 10 μm, preferably about 5 μm. Formed into a filter shape, the inert liquefied nitrogen gas LN2 for addition temporarily stored inside can be exuded in a fixed amount to the outside, and the addition lead wire 30 protruding from the tip has an outer diameter of 0.
．． If the diameter is between 4 and 1.0 mm, preferably 0.8 mm, the shape of the tip 30a may be cut at a right angle as shown in Fig. 4, but if the outer diameter is between Llmm and 4.0 mφ, Preferably 1.2-2. In the case of O rrrmφ, it is necessary to bevel or taper the tip to make it sharp. The inert liquefied nitrogen gas LN2 is transmitted and flows down to the most protruding end 30a.
The inert liquefied nitrogen gas LN2 that has arrived in the tank is made to flow continuously into droplets without becoming enlarged droplets that would impede quantitative addition.

However, in the embodiments of the present invention, the additive conductor 30 is explained as being in the shape of a solid straight rod, but it is also possible to carve a guide groove on the outer periphery, form the additive conductor itself into a coil shape, or form a hollow pipe into inert liquid from the inside and outside. It is also possible to freely transmit nitrogen gas LN2.

In the figure, 35, 36, and 37 are drain holes.

In the present invention, the quantitative addition of inert liquefied nitrogen gas LN2 has been exclusively explained, but the case of inert liquefied carbon dioxide gas LCO2 is treated in exactly the same manner and is included within the spirit of the present invention.

To explain the method of the present invention with reference to FIG. 2, the on-off valve 4o, in which the tip member 38 of the addition liquefied gas path on-off valve mechanism B is fixed with a pin 39, changes from the closed state at the solid line position to the open state at the imaginary line position. Then, the inert liquefied nitrogen gas LN2 for addition stored and pressurized in the central tank 1 is maintained at about -190°C and enters the gas chamber 4 through the cooling gas guide pipe 1o passing through the valve port 41 from the direction of the arrow. The inert liquefied nitrogen gas LN2 for addition is vigorously ejected from the quantitative liquid ejection nozzle 8 cooled in a nitrogen gas GN2 atmosphere, and is transferred to the support holder 2.
The inert liquefied nitrogen gas LN2 for addition is temporarily stored in the pressure elimination nozzle 29 through the central vertical hole 20 of No. Under the pressure of the vaporized gas GN2, inert vaporized nitrogen oozes quantitatively from the liquid-permeable pores onto the tapered surface 29b, fills and descends from the gas chamber 4 into the vaporized gas cylinder 32 via the vertical holes 21 and 22. Enveloped in the atmosphere of the gas GN2, evaporation and freezing are suppressed while the canned material α is quietly added in a free-falling manner along the addition conductor 30 from the tip 30a passing directly below, and bounces on the liquid surface of the contents of the canned material α. A fixed amount can be added without scattering outside the can.

* The table below shows the experimental data obtained by comparing canned pressure measurements at a liquid temperature of 20°C between a canned product to which the present invention was applied and a conventional canned product.

〔conditions〕

■Line speed ■Can Type ■Liquid content ■Liquid filling amount ■Additional conductor diameter 60 CPM SCP250A 94°C warm water 245±3 (g) 0.8 mmg Note that the data marked with * are data that was managed at a filling amount of 245±1 t.

From the above results, the internal pressure of the inert liquefied nitrogen gas for addition is LN.
Even if the amount of LN2 added is constant, the internal pressure of the can will vary due to variations in the amount of residual LN2 due to evaporation in the vaporization process and variations in the head space (the gap between the content liquid level and the can lid) due to variations in the amount of liquid content filled. was confirmed to be influenced by

In this way, the present invention prevents the content liquid level from scattering while maintaining quantitative dosing properties by specially installing a pressure erasing nozzle made of sintered alloy with a roughness of about 5μ and having a dosing conductor attached to the tip of the metered liquid dispensing nozzle. It exhibits excellent effects such as being able to control quantitative addition.

[Brief explanation of the drawing]

Fig. 1 is a central vertical sectional view of the main part of the conventional device, Fig. 2 is an enlarged central longitudinal sectional view of the main part of the device of the present invention, Fig. 3 is a plan view of the pressure elimination nozzle, and Fig. 4 is a half longitudinal sectional view of the same. It is a front view. A... Sealed tank, B... Liquefied gas path opening/closing valve mechanism for addition, X... Inert liquefied gas quantitative addition device, LN2.
...Liquefied nitrogen gas, GN2...Vaporized nitrogen gas, α...
・Canned food, 1...Center tank, 2...Intermediate tank, 3...Outer tank, 4...Gas chamber, 7...Bottom plate, 8...Quantitative liquid output nozzle, 1o... Cooling gas guide pipe, 20...Central vertical 'PL, 21, 22...Vertical hole, 23...Support holder, 26...Relay pipe, 29...Pressure elimination nozzle, 29b...Taper Surface, 30... Additive conductor, 31
... Outlet metal, 32... Vaporizing gas cylinder.

Claims (1)

[Scope of Claims] 1. The inert liquefied gas for addition which is ejected in a fixed amount from the liquid outlet nozzle that communicates directly with the inert liquefied gas for addition is once received and temporarily stored to extinguish the ejection pressure, and then separately A quantitative addition method of inert liquefied gas in which active vaporized gas is constantly flowed down at a constant rate through a hanging addition conductor into the ejected atmosphere. 2. An inert liquefied gas quantitative addition device comprising an addition lead wire attached to the tip of a pressure erasing nozzle that hangs down from the lower end of a support holder that inserts the lower part of the quantitative liquid discharge nozzle into the central vertical hole and communicates with the central vertical hole. 3. Claims: The pressure elimination nozzle has a tapered outer periphery and a filter-like liquid-permeable porous lower part so that the inert liquefied gas for addition temporarily stored inside can be exuded in a fixed amount to the outside. 2. The inert liquefied gas quantitative addition device according to item 2. 4. The inert liquefied gas quantitative addition device according to claim 2, wherein the addition lead wire attached to the pressure elimination nozzle protrudes through the lower end outlet of the vaporized gas cylinder that perpendicularly projects against the lower end of the outer periphery of the support holder. . 5. The inert liquefied gas quantitative addition device according to claim 2, 3, or 4, wherein the liquid-permeable porous material has a pore diameter of approximately 2 to 10 microns. 6. Quantitative addition of inert liquefied gas according to claim 2, 3, 4, or 5, wherein the addition conductor has an outer diameter of approximately 0.4 to 4.0 sieves. Device.