JPH0589782A - Evacuating and sealing apparatus for tubular bulb - Google Patents

Abstract

PURPOSE:To provide a gas-evacuating and sealing apparatus for a tubular bulb wherein the apparatus can evacuate gases from tubular bulbs and seal them in vacuum without using small tubes for gas evacuation and carry out degasing by heating the bulbs without reducing the gas evacuating speed at the time of gas evacuation. CONSTITUTION:A tubular bulb heating heater 21 is set in the outer circumference of a tubular bulb 15 and the inside of the tubular bulb 15 is made vacuum while degasing the tubular bulb 15 by heating it with the heating heater 21. The open side of the tubular bulb 15, another end of which is closed, is held freely attachably/detachably by a gas evacuating head 10 and at the same time a mount supporting body 19b is installed inside the gas evacuating head 10 in the way that it can move up and down freely while being set to face to the open side, and a mount 15b is supported while being separated from the open part during gas evacuation and further a heater 18 for sealing is installed in the periphery of the open end of the tubular bulb 15.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an exhaust gas sealing device for a tube. More specifically, when exhausting gas, the opening of a valve whose one end is closed is directly exposed to an exhaust head.
The present invention relates to a bulb exhaust sealing device in which a valve is heated from the outside so that degassing can be performed.

[0002]

2. Description of the Related Art As a device for sealing an exhaust gas of a tube, an exhaust sealing device which accommodates a valve or a mount whose one end is closed in a vacuum container and performs the exhaust sealing in a vacuum is widely used. Referring to FIG. 4, the exhaust sealing device will be briefly described by taking a case of manufacturing a fluorescent lamp as an example. A vacuum container 61 is detachably and airtightly attached to an exhaust head 60 connected to an exhaust line and a gas charging line. Installed. In this vacuum container 61, in order to improve mass productivity, a large number of mounts (electrode members) 63 and a valve 64 whose one end is closed are vertically housed in a plate heater 62 made of carbon or the like. Then, after exhausting in the exhaust line, the enclosed gas is introduced into the vacuum container 61 from the gas encapsulation line, the enclosed gas is filled in the valve 64, and is heated and sealed by the sealing heater to form a desired bulb. I am supposed to get it.

[0003] This exhaust sealing device uses a thin tube in various points such that a tube can be manufactured without using a thin tube for exhaust, therefore the exhaust speed is high and the outer lead is extremely little oxidized. Is excellent against. However, in the vacuum container 61, a valve 64 is provided as a heating element.
Since there is only the heater 62 for sealing, only the lower part of the valve 64 is heated, and the entire valve 64 cannot be heated. Therefore, there are drawbacks such that the degassing of the valve 64 is insufficient, the length of the valve 64 to be processed is limited, and the quality characteristics of the exhausted bulb are adversely affected.

In order to solve such a drawback, there is a device in which a large coil or mesh heater is arranged in the vacuum container 61, but impure gas is released from the heater itself, and evaporation black matter is accumulated from the heater for a long time. If the inside is contaminated, the exhaust rate is reduced due to the size of the vacuum container 61 becoming larger, or an expensive gas such as xenon gas is charged, the loss becomes large and the cost of the bulb becomes high. There are drawbacks such as. Therefore, it seems that a device containing a heater is not generally adopted.

[0005]

As described above, the conventional bulb exhaust sealing device using the vacuum container cannot sufficiently degas the bulb, and thus the quality of the lamp after exhaust is improved. There are drawbacks such as adverse effects and limitation of the length of the valve to be processed. Further, the apparatus provided with the heater in the vacuum container has a drawback that the size of the vacuum container becomes large and therefore the exhaust speed is significantly reduced, and the loss of the enclosed gas is large, resulting in high cost.

Therefore, an object of the present invention is to perform exhaust and sealing without using a thin tube in the exhaust head, and to perform sufficient degassing without lowering the exhaust speed to improve the lamp quality after exhaust. Without any negative impact,
Moreover, it is an object of the present invention to provide an exhaust gas sealing device for a bulb that does not limit the length of a valve to be processed.

[0007]

In order to achieve the above object, in the exhaust gas sealing device of the present invention, a tube heater is arranged on the outer periphery of the tube, and the heater is used to move the tube. An exhaust gas sealing device for vacuuming the inside of a bulb while heating, wherein an exhaust head is detachably disposed on the opening side of the bulb whose one end is closed, and the inside of the exhaust head is provided with the opening side. The mount support is provided so that it can be moved up and down, and the heater for sealing is provided near the opening end of the tube.

[0008]

In the present invention, since the valve opening is directly exposed to the exhaust head and the heater is provided outside the valve or the vacuum container, the valve can be heated without enlarging the vacuum container. Therefore, sufficient degassing can be performed while maintaining the conventional exhaust speed. Further, in the invention in which the valve is directly heated, the internal volume of exhaust is small,
The exhaust time can be shortened significantly. Further, the invention provided with the mount introducing mechanism can further shorten the exhaust time.

[0009]

DESCRIPTION OF THE PREFERRED EMBODIMENTS The present invention will be described below with reference to the accompanying drawings. 1 is a sectional explanatory view of a first embodiment of the present invention, FIG. 2 is a sectional explanatory view of a second embodiment, FIG. 3 is a sectional explanatory view of a third embodiment, and FIG. 4 is a sectional explanatory view of a conventional example. It is a figure.
In the present specification, the term “bulb” means not only a finished lamp-like product but also a semi-finished product in the manufacturing process such as a bulb or a bulb whose one end is sealed and closed. It includes the tube of.

A description will be given of the first embodiment. The present invention is
A tube heating heater 21 is arranged on the outer circumference of the tube 15, and the tube heater 15 is heated by the heater 21 to evacuate the inside of the tube 15. The exhaust head 10 is removably arranged on the opening side of the tube 15, and a mount support 19a is provided inside the exhaust head 10 so as to face the opening side and can be raised and lowered. It is an exhaust gas sealing device for a tube in which a heater 18 for sealing is provided at a position.

More specifically, the exhaust head 10 has an airtight chamber 11. A conduit 12 communicating with the airtight chamber 11 is attached to the side of the airtight chamber 11, and the conduit 12 is switchably connected to an exhaust system and a gas charging system. Also, above the airtight chamber 11, the rubber band 13
A support step portion 14 that supports the valve is formed, and a valve insertion port 16 through which a valve 15a (one end of which is closed) of the tube 15 is inserted is provided in the central portion. A tightening screw is formed on the outer side of the support step portion 14. When the tightening cap 17 fitted to the tightening screw is attached and tightened, the mouth rubber 13 is pressed and deformed, and the valve 15 is pressed.
Tighten and hold a.

In the airtight chamber 11 of the exhaust head 10,
An annular sealing heater 18 is attached at a sealing height position, and the sealing heater 18 is connected to an external power source. Further, a mount introducing mechanism 19 is provided so as to vertically penetrate the airtight chamber 11. This mount introduction mechanism 19
Is a support rod 19a that is moved up and down by a drive unit (not shown).
And a mount support 19b attached to the support rod 19a. The mount 15b is supported by the mount support 19b, and when the mount 15b is supplied to the mount support 19b, the mount support 19b rises and is positioned above the exhaust head 10.
During exhaust, which will be described later, the mount 15b is lowered to the valve 15 during exhaust.
It is positioned below the opening a, and when sealing is performed, the mount 15b is raised again to perform the lifting operation for holding the mount 15b at the sealing position in the valve 15a.

A tube heater (hereinafter referred to as a heater) 21 is provided above the exhaust head 10 so as to be vertically movable around the outer circumference of the valve 15a. This heater 2
Reference numeral 1 is for heating the valve 15a and the sealing member to perform degassing, and descends during exhaust to heat the valve, but when mounting or removing the valve 15a or mounting
When inserting 5b, it rises and retracts.

The operation of this embodiment will be described. The mount 15b is supplied with the mount support 19b located at the top. Subsequently, the valve 15a as the tube 15 having one end closed is inserted from the valve insertion opening 16 to a predetermined position,
The valve 15a is kept airtight by tightening the tightening cap 17. As the mount support 19b descends, the mount 15b descends near the bottom of the airtight chamber 11 and stands by.
Then, the exhaust is started, and at the same time, the heater 21 is lowered to heat the valve 15a. Heating and exhausting are performed for a set time, during which the valve 15a is sufficiently degassed, and the released gas is immediately exhausted.

When a predetermined degree of vacuum (time) is reached, the heater 21 is raised and heating is stopped. Therefore, the exhaust line is switched to the gas filling line, and the filled gas is introduced into the exhaust head 10 and the valve 15a and filled with a predetermined pressure. When the gas introduction is completed, the mount support 19
b rises, and the mount 15b stops at the sealing position near the valve opening. In this state, the sealing heater 18 heats and seals the valve 15a and the mount 15b. After a suitable time after sealing, the mouth rubber 13 is loosened, and the gas-filled tube 15 is taken out.

In this embodiment, a vacuum container is not used and only the vicinity of the opening of one valve is held by the exhaust head to exhaust and seal the valve in a vacuum. Produce an effect. (A) Since the volume of exhaust gas and gas filling is only the internal volume of the valve and the exhaust head, the exhaust speed is fast and the loss of the filled gas is minimized.
(B) Since the valve is tightened by the rubber band method and stands upright at the specified position, no valve support is required. (C) Since the mount has a mechanism for introducing the mount, the mount can be sufficiently separated from the valve opening, so that the exhaust speed in the valve becomes maximum. (D) Since there is no vacuum container covering the valve and the heater is used for direct heating, the thermal efficiency is good. In addition,
In this embodiment, the heating heater uses electricity, but the heater is not limited to this, gas may be used, and a rubber band is used to tighten the valve, but other tightening means may be used. , The point is that the valve can be held upright in an airtight manner.

Next, a second embodiment will be described with reference to FIG. According to the first aspect of the present invention, a vacuum container 32 is provided so as to cover the exhaust head 30 arranged on the opening side of the tube 15 together with the tube 15 in an airtight manner, and the heater 35 is arranged outside the vacuum container 32. It is an exhaust gas heating device for the described tube. More specifically, the exhaust head 30 is configured by attaching the conduit 12 to an airtight chamber 31 whose upper surface is open. The conduit 12 is switchably connected to an exhaust system and a gas filling system, and the exhaust head 30 is evacuated and filled with gas through the conduit 12. This airtight chamber 31
Has a flat upper end surface. A vacuum container 32 is airtightly mounted on the flat surface of the airtight chamber 31 via packing or the like.

A heater 1 for sealing is provided in the exhaust head 30.
8. A mount introducing mechanism 19 is provided, but these are the same as those of the first embodiment, and therefore, the same reference numerals are given and detailed description thereof is omitted. Further, a valve support 33 for positioning the valve 15a as the bulb 15 having one end closed is provided upright in the exhaust head 30, and an upper valve support 34 is provided above the valve support 33 corresponding to the valve support 33. It is provided. The valve 15a is positioned and held by the valve support 33 and the upper valve support 34. Further, a heater 35 is provided so as to be vertically movable around the vacuum container 32, but this is for degassing by heating the tube 15 from the outside of the vacuum container 32. Others are the same as those in the first embodiment, and detailed description thereof will be omitted.

Next, the operation will be described. The heater 35 is retracted upward, and the vacuum container 32 is removed. Therefore, the mount 15 is mounted on the mount support 19b at the uppermost position.
b is supplied, the valve 15a whose one end is closed is supplied with the opening downward, and the valve supports 33 and 34 position and hold the valve 15a. In this state, the vacuum container 32 is attached and the valve 15a
And the heater 35 is lowered to heat the valve 15a and start exhausting. Hereinafter, since the sealing is the same as in the first embodiment, detailed description thereof will be omitted. When the sealing is completed, the inside of the exhaust head 30 is returned to the atmospheric pressure again, the vacuum container 32 is removed, and the tube 15 which is exhausted and sealed is taken out.

When a small number of valves are accommodated as in this embodiment and a mount introducing mechanism is used, the exhaust time can be remarkably shortened in combination with the compactification of the vacuum container. It is also suitable for automation. In addition, in the present embodiment, the case where one tube is exhaust-sealed has been described, but a plurality of, for example, three tubes are housed in the exhaust head to perform exhaust sealing. Good.

Next, a third embodiment will be described. According to the present invention, the opening side of the tube 15 is erected on the valve support 44, and this is attached to the exhaust head 40.
0 is provided with a vacuum container 42 so as to cover the tube 15, and a tube heater 45 is arranged outside the vacuum container 42 to form an exhaust sealing device for the tube. More specifically,
The exhaust head 40 has the conduit 12 open at the center,
The conduit 12 is switchably connected to the exhaust line and the gas charging line, as in the above-described embodiments. A vacuum container 42 is detachably and airtightly attached to the exhaust head 40 so as to cover the opening.

In the vacuum container 42, a carbon type plate heater 43 is provided as in the case of the conventional example. A plurality of mounts 15 are mounted on the plate heater 43.
b is supported, and a plurality of valves 15a as a bulb 15 having one end sealed therein are erected with their openings facing the mount 15b, and are supported by the valve support 44. A heater 45 covering the outside of the vacuum container 42.
Is provided so that it can be raised and lowered. This heater 45 is
The tube 15 is heated through the vacuum container 42 to perform degassing, and has the same action as that of the second embodiment.

Next, the operation of this embodiment will be described.
The heater 45 is evacuated, the vacuum container 42 is removed under atmospheric pressure, and the mount 15b and the valve 15a (tube 15) with one end sealed are supplied. Therefore, the vacuum container 42 is attached again, the tube 15 is heated through the vacuum container 42 by the heater 45, and the evacuation is started. After a lapse of a predetermined time, heating is stopped and the exhaust line is switched to the gas charging line. Sealed heater 4 after gas filling
After the valve 15a and the mount 15b are sealed by 3, the tube 15 is taken out. In the present embodiment, the heater is provided outside the vacuum container, and the heater is compact as in the conventional case. Therefore, a high exhaust rate can be maintained regardless of degassing.

[0024]

As described above in detail, in the exhaust gas sealing device of the present invention, since the heater for heating the sealing member such as the valve and the mount from the outside is provided, the degassing of the valve, the mount, etc. Is sufficiently performed, and as a result, quality deterioration due to defective exhaust can be significantly reduced.

[Brief description of drawings]

FIG. 1 is an explanatory cross-sectional view of a first embodiment of the present invention.

FIG. 2 is a sectional explanatory view of the second embodiment of the same.

FIG. 3 is a sectional explanatory view of the third embodiment.

FIG. 4 is a sectional explanatory view of a conventional example.

[Explanation of symbols]

 10 exhaust head 15 tube 15a valve 15b mount 18 heater for sealing 19b mount support 21 (tube) heating heater 30 exhaust head 32 vacuum container 33 valve support 34 valve support 35 (tube) heating heater 40 exhaust head 42 Vacuum container 43 Heater for sealing 44 Valve support 45 (tube) heater

Claims (3)

[Claims] 1. An exhaust gas sealing device for a bulb, wherein a heater for heating the bulb is arranged on the outer circumference of the bulb, and the heater is used to evacuate the interior of the bulb. The exhaust head is detachably arranged on the opening side of the tube, and a mount support is provided in the exhaust head so as to face the opening side and can be raised and lowered, and is further positioned around the opening end of the tube. An exhaust gas sealing device for a tube, comprising a heater for sealing. 2. A vacuum container is provided so as to cover the exhaust head arranged on the opening side of the tube together with the tube in an airtight manner, and the heater is arranged outside the vacuum container. Exhaust gas sealing device for a described tube. 3. The valve support is erected on the opening side of the tube,
This is attached to an exhaust head, a vacuum container is provided so as to cover the exhaust head and the tube, and a tube heater is arranged outside the vacuum container.