JP3531497B2 - Gas supply / discharge device for sealed cans - Google Patents

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a gas supply / exhaust device provided on a wall portion of a closed can and used for adjusting internal pressure.

[0002]

2. Description of the Related Art A can filled with a soft drink or the like needs to be subjected to various tests for internal pressure in terms of its function. For example, this type of can has a can lid fixed to the can body, but when the internal pressure changes depending on the type of contents and the environment in which the can with contents is placed, the can lid is joined to the can body. An internal pressure test must be performed to see if the strength is within the acceptable range.

More specifically, in the case of retort sterilization of a can filled with contents, heating is performed after filling and sealing. By measuring and comparing the internal pressures before and after retort sterilization, if there is a change in the internal pressure, it means that gas is leaking from the can wall. Since the internal pressure is measured before and after retort sterilization, the structure must withstand high temperatures.

Further, in the process of successively filling the cans with soft drinks and the like and manufacturing the products one by one, it is checked whether the internal pressure of the cans is within an allowable range by using a percussion machine or a pressing pressure type internal pressure inspection machine. To inspect. In this case, in order to confirm the performance of the percussion machine or the press-type can internal pressure inspection machine used, the percussion machine or the can internal pressure inspection machine was used, and the cans whose internal pressure was within the allowable range A test to distinguish between and is performed. At this time, the internal pressure is set in order to prepare a can whose internal pressure is within the allowable range and a can whose internal pressure is not within the allowable range in advance.

Conventionally, in order to adjust the internal pressure of this kind, the internal pressure of the can has been adjusted by a rubber stopper 51 having a structure shown in FIG. 8 (a). That is, FIG.
(A) shows a cross section of the bottom of the can, in which the hole 52
Are formed. In order to adjust the internal pressure of the can in which the can lid is fitted, the rubber stopper 51 is first engaged with the hole 52. A peripheral groove 54 is formed on the rubber plug 51.
4 is fitted and engaged with the peripheral edge portion 53 of the hole 52. The caulking material 55 covers the gap formed by the rubber stopper 51 and the peripheral portion 53 of the hole 52 from the outside of the can. After that, when the internal pressure is changed, an injection needle-shaped thin tube 56 is pierced into the rubber stopper 51 as shown in FIG. 8B, and gas is sent through the thin tube 56 to adjust the internal pressure.

[0006]

By the way, in the above rubber stopper 51, when a high-pressure gas is fed into the closed can through the thin tube 56, the periphery of the rubber stopper 51 and the thin tube 56 and the rubber stopper 51.
There was a problem that gas leaked out from the gap. Further, in the retort sterilization performed by heating the closed can, the rubber stopper 51 cannot endure high temperature, and there is a problem that gas leaks. Further, the rubber stopper 51 has a problem that once the internal pressure is set, the sealed state is not maintained and the internal pressure cannot be repeatedly set.

The present invention has been made in view of the above circumstances, and can prevent leakage of gas when high-pressure gas is fed into a closed can, and can withstand use at high temperatures, and at the same time, the internal pressure can be reduced. It is an object of the present invention to provide a gas supply / exhaust device for a sealed can that can be repeatedly set.

[0008]

In order to solve the above-mentioned problems, the present invention is a gas supply / exhaust device which is mounted in a hole formed in a wall portion of a closed can to adjust the internal pressure of the closed can. hand,
A first stopper formed in a bottomed tubular shape and closing the hole by engaging with the hole from the outside of the closed can, and having a through hole that connects the inside of the closed can and the tubular hollow portion body and, while being inserted into the tubular hollow portion, and a second plug body having a supply and discharge passage of the sheet discharge port and the gas for the passage of the hermetically sealed housing inner pressure control gas, said hole a first stopper Fixed to
Fixing means and the closed can provided downstream of the supply / discharge passage
The valve section for adjusting the supply amount of the internal pressure adjusting gas and the supply / discharge port
A gas injection plug connected to the port,
O which comes into close contact with the outer wall surface of the inserted gas injection plug
A ring is provided, and a female thread portion is provided on the wall surface of the cylindrical hollow portion.
And a male screw portion is provided on the outer peripheral portion of the second plug body.
And the second plug has the female screw portion and the male screw portion.
By engaging the inside of the cylindrical hollow portion
The second stopper is attached so as to be movable in the axial direction of the empty portion.
An O-ring is located above the male thread on the outer circumference of the body.
Is installed, and the second stopper is sealed in the first stopper.
When moving inward, the downstream end of the supply / discharge passage of the second plug body
The valve body that engages the part to close it and the second plug body seal
When moving to the outside of the can, the supply / discharge passage is connected to the inside of the closed can.
And an introduction passage communicating with the above-mentioned valve portion,
The second plug has a downstream end, a valve body, and an introduction passage.
It is characterized by being made .

According to the present invention, the hole formed in the wall portion of the closed can is closed by engaging the cylindrical outside of the first stopper body formed in the cylindrical shape with a bottom. Then, the gas for adjusting the internal pressure of the closed can is supplied from the supply / discharge port of the second plug inserted into the cylindrical hollow portion of the first plug provided outside the closed can,
The gas for adjusting the internal pressure is stably supplied from the outside of the sealed can to the inside of the sealed can because it is supplied through the through-hole that communicates the inside of the sealed can with the cylindrical hollow portion through the supply / discharge passage. It Since the second stopper is provided with the valve portion for adjusting the supply amount of the internal pressure adjusting gas, the internal pressure of the closed can is stably controlled.

The second plug body is mounted in the tubular hollow portion by screwing means so as to be movable in the axial direction of the tubular hollow portion, and the second plug body is hermetically sealed in the first plug body. A valve element that engages with the downstream end of the supply / discharge passage of the second stopper when closing the can, and when the second stopper moves outside the sealed can. An inlet passage that connects the supply / discharge passage to the inside of the closed can, and the valve portion includes the second passage.
The downstream end of the supply / discharge passage of the plug body, the valve body, and the introduction passage, wherein the valve portion closely attaches the downstream end of the supply / discharge passage of the second plug body to the valve body. -By separating, the downstream end of the supply / discharge passage is opened / closed. Therefore, the internal pressure of the closed can can be adjusted reliably and stably with a simple structure.

The second plug body is mounted in the tubular hollow portion by screwing means so as to be movable in the axial direction of the tubular hollow portion. That is, the second plug is moved in the cylindrical hollow portion along the screwing means,
The introduction passage is formed by closely contacting and separating the downstream end of the supply / discharge passage of the plug body and the valve body. Thus, the valve portion can be opened and closed with a simple structure, and the internal pressure of the closed can can be easily adjusted.

The second plug body has a can outer side end surface of the first plug body when the second plug body is moved to close the downstream end of the supply / discharge passage with the valve body. Since it is formed so as to approximately match the outer end surface of the can, there is no protruding part on the outer side of the closed can of the gas supply / discharge device, and the cross-sectional thickness of the part located outside the closed can can be formed thin. When performing an internal pressure test, handling is easy and stable installation is possible.

The outer end surface of the can of the second stopper and the gas injection stopper are provided with a connecting projection on one of them and a connecting recess on the other end that can be fitted into the connecting projection. Has been done. Therefore, even if the can outer end surface of the first stopper body and the end surface of the second stopper body on the supply / discharge port side are substantially aligned with each other, the gas injection stopper and the second stopper body are provided with respective concave and convex portions. The second plug can be easily and stably rotated along the screwing means by connecting and rotating.

Since the first stopper is formed with a flange portion that abuts the outer peripheral edge of the hole of the closed can,
To close the hole, the first stopper may be inserted into the hole from the outside of the closed can, and the flange portion may be brought into contact with the outer peripheral edge portion of the hole, so that the hole is stably closed.

[0015]

BEST MODE FOR CARRYING OUT THE INVENTION A gas supply / discharge device for a sealed can according to an embodiment of the present invention will be described below with reference to the drawings. FIG. 1 is an exploded cross-sectional view of a gas supply / discharge device for a sealed can according to the present invention, and FIG. 2 is a cross-sectional view showing a state in which a gas supply / discharge passage of the gas supply / discharge device is closed.

In FIG. 1, the gas supply / discharge device comprises a first plug body 1 formed in a cylindrical shape having a bottom and a second plug body formed in a cylindrical shape.
It is provided with a stopper body 2, a fixing means 3, and an injection stopper 4 for injecting a gas for adjusting the pressure inside the closed can.

A cylindrical hollow portion 11 having a circular shape in a plan view is formed in the first stopper 1 formed in a cylindrical shape with a bottom. The cylindrical hollow portion 11 is provided so that its vertical cross section is convex downward, and has a large hollow portion 11a and a small hollow portion 11b.
And are formed. Further, on the hollow bottom portion 11c of the inner wall surface of the cylindrical hollow portion 11, a valve body 12 made of a seal member such as rubber is installed so as to cover the entire hollow bottom portion 11c.

A cylindrical hollow portion 11 is provided near the hollow bottom portion 11c.
A through hole 13 is formed in the horizontal direction in FIG. 1 so as to communicate with the outside of the first plug body 1. Also, the hollow small-diameter portion 1
A first female screw portion 14 which is a screwing means is formed on the wall surface of 1b.

The outer peripheral cylindrical portion 11d of the first plug 1 is formed in a circular shape in a plan view, and the first outer peripheral cylindrical portion 11d has a first outer peripheral cylindrical portion 11d.
A male screw portion 15 is provided. Further, in FIG. 1, a flange portion 16 having a larger diameter than the outer peripheral cylindrical portion 11d is formed above the outer peripheral cylindrical portion 11d in a hexagonal shape in plan view as shown in FIG. A first concave portion 18a is formed in an annular shape on the engaging surface 17 which is a lower surface of the flange portion 16, and a first O-ring 18 is installed in the first concave portion 18a.

The second stopper 2 is a hollow cylindrical portion 1 of the first stopper 1.
Along the shape of No. 1, the vertical cross-sectional shape is formed in a downward convex shape. At the upper part of the second stopper 2, a supply / discharge port 21 equipped with an O-ring 21a for adjusting the internal pressure of the closed can.
Is provided, and a supply / discharge passage 22 is formed continuously from the supply / discharge port 21. This supply / discharge passage 22 has a second
It is provided so as to penetrate the second stopper body 2 along the longitudinal direction of the stopper body 2, and the downstream end 22a of the supply / discharge passage 2 is
It is located on the lower end surface 23 of the second plug body 2 which is formed in a planar shape.

On the outer peripheral portion 2a of the cylindrical portion of the second plug body 2,
A second male screw portion 24, which is a screwing means, is provided, and a second O ring 25 is installed above the second male screw portion 24 in a second recess 25a formed in an annular shape.

A large-diameter portion 26 having a diameter larger than that of the outer peripheral portion 2a is provided on the upper portion of the second plug body 2, and an upper end surface 27 of the large-diameter portion 26 is formed in a flat shape. On this upper end surface 27,
As shown in FIGS. 1 and 3, a recess 28 is formed so as to face the supply / discharge port 21.

The fixing means 3 is formed in an annular shape, and is provided so as to penetrate the first plug engaging portion 31 formed in a planar circular shape for engaging the first plug 1. . The second female threaded portion 32 is formed on the wall surface of the first plug engagement portion 31.
Is provided so that the first male screw portion 15 of the first plug body 1 can be engaged. Further, the size of the fixing means 3 in the height direction is formed to be smaller than the size of the outer peripheral cylindrical portion 11d of the first stopper 1 in the height direction, and the first stopper 1 and the fixing means 3 are connected to each other. When engaged, the through hole 13 of the first plug 1 projects downward from the lower end surface 33 of the fixing means 3. Further, the outer peripheral surface 34 of the fixing means 3 is
As shown in FIG. 4, it is formed in a hexagonal shape in a plan view, and forms a nut as a whole.

At the lower part of the injection plug 4 formed in a cylindrical shape, there is provided an injection portion 41 which is formed in a downward convex shape so as to follow the shape of the supply / discharge port 21 of the second plug body 2. Of these, the injection plug 4 is formed in a hexagonal shape in plan view as shown in FIG. 5, and the injection part 41 is viewed in plan view along the shape of the supply / discharge port 21 of the second plug body 2. It is formed in a circular shape.

Inside the injection plug 4, there is formed an injection path 42 which penetrates along the longitudinal direction of the injection plug 4, and the vertical cross-sectional shape of the injection path 42 widens as it goes upward. It is shaped like a funnel. The straight portion 42a, which is a narrow portion below the injection path 42, is
On the other hand, the upper wide mouth portion 42b has an opening 44 in the upper portion, and a third female thread portion 43 is formed on the inner wall surface of the wide mouth portion 42b. Also,
In the lower part of the injection plug 4, two convex portions 45 made of a pin are provided so as to face the injection portion 41.

In order to mount such a gas supply / discharge device on a can, as shown in FIG. 2, a circular hole 101 penetrating the can wall portion 100 is inserted into a circular hole 101 from the outside A of the can to the outer periphery of the first plug 1. Cylindrical part 1
1d is inserted and the outer peripheral cylindrical portion 11d is projected into the inside B of the closed can. Then, the engagement surface 17 on the lower surface of the flange portion 16 of the first plug body 1 is brought into contact with the outer peripheral edge portion 102 of the hole 101, and the first O-ring 18 provided on the engagement surface 17 is brought into close contact. It should be noted that the can wall portion 100 may be any of a can lid wall, a can bottom wall, and a can body wall, but it is preferable to mount the can wall portion 100 on a wall surface of a can lid having a flat surface.

Next, the fixing means 3 is engaged from the inside B of the closed can with the outer peripheral cylindrical portion 11d of the first stopper 1 protruding into the inside B of the closed can. Then, the first male screw portion 15 of the first plug body 1
The first plug body 1 is fixed to the can wall portion 100 by tightening and the second female screw portion 32 of the fixing means 3. At this time, the dimension of the fixing means 3 in the height direction is formed to be smaller than the dimension of the outer peripheral cylindrical portion 11d of the first plug body 1 in the height direction, and the through hole 13 of the first plug body 1 is Fixing means 3
Since it projects downward from the lower end surface 33, the outside of the through hole 13 is not blocked by the fixing means 3.

Since the flange 16 of the first plug 1 and the outer peripheral surface 34 of the fixing means 3 of the first plug 1 are hexagonal in plan view, a spanner or the like is used for mounting. Can be easily tightened. Also, the first O-ring 18
Is provided, the leakage of gas inside the sealed can from the vicinity of the flange portion 16 is prevented.

Next, the second stopper body 2 is inserted from the outside A of the can into the tubular hollow portion 11 of the first stopper body 1 fixed to the can wall portion 100. Then, the first female thread portion 14 formed in the tubular hollow portion 11 of the first plug body 1 and the second male thread portion 24 of the second plug body 2.
Engage and. At this time, the second stopper 2 is rotated in the vertical direction, that is, the cylindrical hollow portion 11 by rotating the second stopper 2 so as to loosen or tighten the screw portion.
Is moved in the axial direction of the first stopper 2 and the lower end surface 23 of the second stopper 2
The lower end surface 23 and the valve body 12 form a valve portion 13a, which is in close contact with and separated from the surface of the valve body 12 installed in the hollow bottom portion 11c of the tubular hollow portion 11 of the plug body 1.

By tightening the second plug 2 along the threaded portion, the lower end surface 23 of the second plug 2 and the valve body 12 installed in the hollow bottom 11c are brought into contact with each other. When the lower end surface 23 and the valve body 12 are in close contact with each other, the downstream end 22a of the supply / discharge passage 22 formed in the second plug body 2 is closed by the valve body 12. At this time, since the lower end surface 23 of the second plug body 2 and the surface of the valve body 12 are formed in a flat shape, and the valve body 12 is made of a material having a cushioning property such as rubber, the mutual adhesion is stable. Done.

The second male screw portion 2 on the outer peripheral portion 2a of the second plug body 2
By installing the second O-ring 25 above
It is possible to prevent leakage of the internal pressure adjusting gas from the vicinity of the outer peripheral portion 2a of the plug body 2.

The upper end surface 1 of the first stopper 1 located outside the can A
9 and the upper end surface 27 of the second stopper body 2 are formed in a flat shape, and the second stopper body 2 is engaged with the tubular hollow portion 11 of the first stopper body 1 to close the valve portion 13a. At this time, the upper end surface 19 of the first stopper 1 and the upper end surface 27 of the second stopper 2 are provided so as to be flush with each other, and a protruding portion is generated on the outside A of the can. There is no such thing.

When the second stopper 2 is rotated, the concave portion 28 provided on the upper end surface 27 of the second stopper 2 and the convex portion 45 provided on the injection plug 4 are engaged with each other, so that the injection plug 4 is closed. By rotating, the second plug 2 is rotated together with the injection plug 4. For this reason, the upper end surface 27 of the second stopper body 2 is the upper end surface 1 of the first stopper body 1.
Even if it is formed so as to be flush with 9, the second plug 2 can be stably rotated. The injection plug 4 has a plan view shape of 6
Since it is formed in a rectangular shape, the injection plug 4 can be easily rotated by using a spanner or the like.

A gas supply means (not shown) is inserted into the injection plug 4 from the opening 44 of the injection plug 4 into the wide opening 42b of the injection passage 42, and is engaged with the third female thread 43.

In order to adjust the internal pressure of the closed can using the gas supply / discharge device mounted on the can wall 100, the second stopper 2 is rotated by using the injection stopper 4 as shown in FIG. The lower end surface 23 of the second plug body 2 and the surface of the valve body 12 of the hollow bottom portion 11c are separated from each other to form the introduction passage 60. At this time,
The injection path 42 of the injection plug 4 and the supply / discharge port 21 of the second plug 2
The supply / discharge passage 22, the introduction passage 60, and the through hole 13 of the first plug body 1 are communicated with each other. That is, as shown in FIG.
By separating the lower end surface 23 of the second plug body 2 from the surface of the valve body 12 and opening the valve portion 13a, an introduction passage 60 for the internal pressure adjusting gas 103 is formed, and the inside of the cylindrical hollow portion 11 is sealed. The through hole 13 communicates with the inside of the can.

Then, the injection part 41 of the injection plug 4 is inserted into the supply / discharge port 21 of the second plug 2. The gas supplied from the gas supply means (not shown) is supplied from the injection path 42 to the supply / discharge port 21 as shown by the arrow in FIG. At this time, since the supply / discharge port 21 is provided with the O-ring 21a so as to come into close contact with the outer wall surface of the inserted injection portion 41, gas leakage from the vicinity of the injection portion 41 is prevented. There is. Then, the supplied gas, after passing through the supply / discharge passage 22, is sent to the through hole 13 through the opened valve portion 13a and supplied to the inside B of the closed can.

Then, after adjusting the internal pressure of the closed can with the valve portion 13a opened, the second stopper 2 is rotated again to close the valve portion 13a and maintain the adjusted internal pressure.

As described above, the hole 101 formed in the can wall portion 100 is closed by engaging the outer peripheral cylindrical portion 11d of the first stopper body 1 having a bottomed cylindrical shape. Then, the internal pressure adjusting gas 103 is supplied from the supply / discharge port 21 of the second plug body 2 inserted into the tubular hollow portion 11 of the first plug body 1 provided on the outside A of the can, and flows through the supply / discharge passage 22. After that, the internal pressure adjusting gas 103 is stably supplied from the outside A of the can to the inside B of the closed can because it is supplied through the through hole 13 that communicates the inside of the closed can with the tubular hollow portion 11.

The amount of supply of the internal pressure adjusting gas 103 is set so that the downstream end portion 22a of the supply / discharge passage 22 of the second plug 2 is set to the first plug 1
Valve body 1 installed in the hollow bottom portion 11c of the cylindrical hollow portion 11 of
The inner pressure of the hermetically sealed can can be adjusted stably by opening and closing the downstream end 22a of the supply / discharge passage 22 so as to be in close contact with / separated from the surface of 2.

The opening / closing of the downstream end 22a of the supply / discharge passage 22 is performed by the first hollow formed in the cylindrical hollow portion 11 of the first plug 1.
This is performed by engaging the female screw portion 14 and the second male screw portion 24 formed on the outer peripheral portion 2a of the second plug body 2 and rotating the second plug body 2. That is, the second stopper 2 is replaced with the first stopper 1
A valve installed on the lower end surface 23 of the second plug body 2 and the hollow bottom portion 11c of the first plug body 1 by tightening the first female thread portion 14 and the second male thread portion 24 in the cylindrical hollow portion 11 of The lower end surface 2 is adhered to the surface of the body 12 while the first female screw portion 14 and the second male screw portion 24 are loosened.
3 and the hollow bottom portion 11c are separated from each other. And
By providing the downstream end surface 22a of the supply / discharge passage 22 on the lower end surface 23 of the second plug 2, the supply / discharge passage 22 can be easily opened and closed, and the internal pressure of the closed can can be easily adjusted. You can

The upper end surface 19 on the outside A of the first plug 1 and the second
It is formed flush with the upper end surface 27 of the stopper 2 at the same height position. Therefore, the outside of the can A has no protruding portion of the gas supply / discharge device, and the thickness of the cross-section of the portion located on the outside A of the can can be formed thin, which facilitates the handling during the internal pressure test. At the same time, stable installation becomes possible. That is, as shown in FIG. 7, after the gas supply / discharge device is installed on the can wall portion 100 at the bottom of the can to adjust the internal pressure of the inside B of the closed can, the valve portion 13a is closed and the injection plug 4 is removed. Since the upper end surfaces 19 and 27 are installed at a position lower than the tip of the annular convex portion 104 at the bottom of the can, the annular convex portion 1
There is no portion protruding from 04, and handling is easy.

Upper end surface 2 of the second plug 2 on the supply / discharge port 21 side
7 is provided with a recess 28 for locking the injection plug 4, and the rotation of the second plug 2 causes the projection 45 formed on the injection plug 4 to move into the recess 28 of the second plug 2. Injection plug 4 while engaging
By rotating. Therefore, even if the upper end surface 19 of the first stopper body 2 and the upper end surface 27 of the second stopper body 2 are formed flush with each other at the same height position, the convex portion 45 of the injecting plug 4 is not covered with the second stopper body. Since it suffices that the second plug 2 is locked in the second recess 28 and rotated, the second plug 2 can be easily rotated.

Since the first plug 1 is formed with the flange portion 16 which is brought into contact with the outer peripheral edge portion 102 of the hole 101 of the closed can, the hole 101 is closed by the outer peripheral cylinder of the first plug body 1. Insert the portion 11d into the hole 101 from the outside of the can wall portion 100,
Since it suffices to bring the flange portion 16 into contact with the outer peripheral edge portion 102 of the hole 101, the hole 101 is stably closed.

The fixing means 4 is formed as a nut, and the first plug 1 is the outer peripheral cylindrical portion 11 of the first plug 1.
Since the first male screw portion 15 formed in d and the second female screw portion 32 of the fixing means 4 are fixed by engaging from the inside B of the closed can, by tightening the fixing means 4,
Since the can wall portion 100 is fastened by the fixing means 4 and the flange portion 16, the first stopper 1 is securely fixed.

[0045]

The gas supply / discharge device for a sealed can according to the present invention has the following effects. (1) The hole formed in the wall portion of the closed can is closed by engaging the cylindrical outside of the first stopper body formed in the cylindrical shape with a bottom. Then, the gas for adjusting the internal pressure of the closed can is supplied from the supply / discharge port of the second plug inserted into the cylindrical hollow portion of the first plug provided on the outside of the closed can, passes through the supply / discharge passage, and is sealed. Since the gas for adjusting the internal pressure is supplied through the through hole that communicates the inside of the can and the cylindrical hollow portion, the internal pressure adjusting gas is stably supplied from the outside of the closed can to the inside of the closed can. Since the second stopper is provided with the valve portion for adjusting the supply amount of the internal pressure adjusting gas, the internal pressure of the closed can is stably controlled. (2) The valve portion opens and closes the downstream end of the supply / discharge passage by closely contacting / separating the downstream end of the supply / discharge passage of the second plug with the valve body. Therefore, the internal pressure of the closed can can be adjusted reliably and stably with a simple structure. (3) The second plug body is mounted in the tubular hollow portion so as to be movable in the axial direction of the tubular hollow portion by a screwing means, and the second plug body is screwed in the tubular hollow portion. The introduction passage is formed by moving the second plug body along the downstream side end portion of the supply / discharge passage of the second plug and the valve body. Therefore, the valve portion can be opened and closed with a simple structure, and the internal pressure of the closed can can be easily adjusted. (4) The second plug body has a can outer side end face of the first plug body when the second plug body is moved to close the downstream end of the supply / discharge passage with the valve body. Since it is formed so as to substantially match the outer end surface of the can, there is no protruding portion on the outer side of the closed can of the gas supply / discharge device, and the cross-sectional thickness of the portion located outside the closed can can be formed thin. When performing an internal pressure test, handling is easy and
Stable installation is possible. (5) On the outer side end surface of the second stopper and the gas injection stopper, a connecting projection is formed on either one of the two, and a connecting recess is formed on the other end so that the connecting projection can be fitted into the connecting projection. Has been done. Therefore, even if the can outer end surface of the first stopper body and the end surface of the second stopper body on the supply / discharge port side are substantially aligned with each other, the gas injection stopper and the second stopper body are provided with respective concave and convex portions. The second plug can be easily and stably rotated along the screwing means by connecting and rotating. (6) Since the first stopper is formed with a flange portion that abuts on the outer peripheral edge of the hole of the closed can, closing the hole is performed by closing the first stopper from the outside of the closed can. Since the flange portion may be inserted into the hole and the outer peripheral edge portion of the hole may be brought into contact with the hole, the hole is stably closed.

[Brief description of drawings]

FIG. 1 is an exploded cross-sectional view showing an example of an embodiment of a gas supply / discharge device for a sealed can according to the present invention.

FIG. 2 is a cross-sectional view when the gas supply / discharge device is attached to the can wall portion.

FIG. 3 is a plan view seen from above when the first plug and the second plug are connected.

FIG. 4 is a plan view of FIG. 2 seen from below.

FIG. 5 is a plan view of the injection plug as viewed from below.

FIG. 6 is a cross-sectional view illustrating how the internal pressure adjusting gas is supplied into the sealed can.

FIG. 7 is a cross-sectional view when the gas supply / discharge device is attached to the can wall portion.

FIG. 8 is a diagram illustrating a conventional gas supply / discharge device.

[Explanation of symbols]

1 first plug 2 Second stopper 3 fixing means 4 injection plug 11 Cylindrical hollow part 11c hollow bottom 11d outer periphery 12 valve bodies 13 through holes 13a valve part 14 First female thread (screw attachment means) 15 First male thread 16 Flange 17 Engaging surface 19 First stopper top surface 21 Supply / Discharge port 22 Supply and discharge passage 23 Bottom face 24 Second male thread (screw attachment means) 27 Upper end surface of the second stopper 28 recess 31 First Plug Engagement Part 32 Second female thread 33 Bottom face 41 Connection 42 injection path 45 convex 60 introduction passage 100 can wall 101 holes 102 Outer peripheral edge A can outside B inside a sealed can

Claims (4)

(57) [Claims] 1. A gas supply / exhaust device which is mounted in a hole formed in a wall portion of a closed can to adjust the internal pressure of the closed can, and which is formed in a cylindrical shape with a bottom and is provided from the outside of the closed can. While closing the hole by engaging the hole, a first plug body in which a through hole that communicates the inside of the closed can and the tubular hollow portion is formed, and while being inserted into the tubular hollow portion, A second stopper having a supply / discharge port for the gas for adjusting the internal pressure of the closed can and a supply / discharge passage for passing the gas, a fixing means for fixing the first stopper in the hole, and a downstream of the supply / discharge passage. A valve portion for adjusting the supply amount of the gas for adjusting the internal pressure of the closed can provided and a gas injection plug connected to the supply / discharge port are provided , and the supply / discharge port is provided with a gas injection plug of the inserted gas injection plug. outer wall
An O-ring that is in close contact with the surface is provided, and a female screw portion is formed on the wall surface of the cylindrical hollow portion.
A male screw portion is provided on the outer peripheral portion of the second stopper, and the second stopper is provided.
For engaging the female thread portion and the male thread portion
Is moved in the tubular hollow portion in the axial direction of the tubular hollow portion.
Movably attached to the outer periphery of the second stopper above the male thread.
An O-ring is installed , and the second stopper moves to the inside of the sealed can on the first stopper.
When it is engaged with the downstream end of the supply / discharge passage of the second plug,
When the valve body that closes this and the second plug body move to the outside of the closed can, the supply / discharge passage
Is provided to communicate with the inside of the closed can, and the valve portion includes a downstream end of the supply / discharge passage of the second stopper and a valve body.
A gas supply / exhaust device for a sealed can, which is characterized by being configured with an introduction passage . 2. The outer surface of the can of the second stopper is
The second plug is moved to bring the downstream end of the supply / discharge passage into the valve.
When closed by the body, it is formed so as to substantially match the outer end surface of the can of the first stopper.
The gas supply / exhaust device for a sealed can according to claim 1, wherein 3. A can outer end surface of the second stopper and the gas injection
One of the stoppers has a connecting projection, and the other
Is formed with a connecting concave portion that can be fitted into the connecting convex portion.
The gas supply device for a closed can according to claim 1 or 2, characterized in that: 4. The first stopper has a hole outside the hole of the closed can.
A flange that contacts the side peripheral edge is formed.
A gas supply / discharge device for a sealed can according to any one of claims 1 to 3 .