JPS6234690B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a glass tube vacuum sealing device for sealing a high vacuum state between an inner tube and an outer tube constituting a vacuum double glass tube type collector used as a solar heat collecting tube. .

In the collector mentioned above, a high vacuum is maintained between the inner and outer tubes to enhance the heat collection effect and prevent heat convection. Double-pipe collectors have large variations in the shape of their tails, which makes it impossible to determine the length of the exhaust pipe, making it impossible to automatically close or cut the exhaust pipe after air removal. , the base of the exhaust pipe was manually blocked and cut. Therefore, currently,
Using a metal tube for the inner tube and a glass tube for the outer tube,
A method was adopted in which the open ends of both caps were sealed with metal caps, and the air was vented through an exhaust pipe installed in the cap, thereby automating the closing of the exhaust pipe after air was vented. Since the seal ring attached to the cap could not be permanently sealed, a high vacuum could not be maintained between the inner and outer tubes. Therefore, conventionally, from the perspective that the reduction in heat collection effect due to a reduction in the degree of vacuum cannot be ignored, air is removed from the exhaust pipe provided in the tail section.
The tube was blocked by extremely inefficient manual labor.
He was forced to cut it off.

In view of the inefficiency of conventional venting operations, this invention bleeds the inside of a glass tube to a high vacuum, and quickly closes and cuts the exhaust pipe after venting. It was also invented with the aim of standardizing the length of the cut remaining portion of the exhaust pipe and making the shape of the remaining portion of the exhaust pipe uniform. , a device that automatically melts and closes the base of the exhaust pipe after evacuating the inside of the glass tube, which comprises a glass tube support part that holds the glass tube in an upright position and supports the stem part, and an exhaust pipe into which the exhaust pipe is inserted. The exhaust pipe insertion part that supports the exhaust pipe, the annular heating element that melts and closes the exhaust pipe near the stem part, and the glass tube supported in an upright position are uniformly heated to the high temperature required for air removal work. It consists of a glass tube heating furnace for heating, and the exhaust pipe insertion part leading to the vacuum pump has an airtight elastic ring that bulges out against the outer circumferential surface of the exhaust pipe and is in close contact with the exhaust pipe to be inserted in a concentric state. The gist of the configuration is that the annular body is provided with compression means for surrounding the outer peripheral surface and upper and lower surfaces of the annular body.

Hereinafter, the present invention will be explained in detail based on embodiments shown in the drawings.

In FIGS. 2 and 3, 1 is a glass tube to be processed, and 2 is an exhaust pipe provided at the axial center of the stem portion 3 of the glass tube 1.

4 is a glass tube support part that supports the glass tube 1 in an upright state, and this glass tube support part 4 is formed with an exhaust pipe insertion hole 5, and the upper surface of this support part 4 is designed to receive the stem part 3. It's getting old.

Reference numeral 6 denotes an exhaust pipe insertion part for inserting and supporting the exhaust pipe 2 downward into the vacuum device. On the upper surface of the cylindrical base 7 that supports the mounting, there is an airtight elastic ring 8 that bulges out and comes into close contact with the outer peripheral surface of the exhaust pipe 2, and an airtight elastic ring 8 that surrounds the outer peripheral surface of the exhaust pipe 2 and the upper surface of the elastic ring 8. Rigid ring bodies 9 are provided one on top of the other in the axial direction, and around the cylindrical base body 7, airtight elastic ring body 8, and rigid ring body 9, a sleeve to which the rigid ring body 9 is fixed at the upper end is arranged as a rigid ring. A body 9 is provided slidably in the axial direction of the airtight elastic ring body 8. Further, a lever 11 for sliding the sleeve 10 in the axial direction is provided on the outer peripheral surface of the cylindrical base 7, and when the lever 11 is pushed down in FIG. This allows the sleeve 10 to be lowered slightly.
12 is a shaft for rotatably attaching the lever 11 to the cylindrical base 7; 13 is the shaft 1 formed on the lever 11;
An engaging pin 14 provided in the sleeve 10 is located in this guide hole 13.
is engaged. Reference numeral 15 denotes a relief groove opened downward in the lower part of the sleeve 10.

The exhaust pipe insertion parts 6 formed as described above are arranged in two rows of 10 in parallel, located below the exhaust pipe insertion holes 5 formed in the glass tube support part 4.

Reference numeral 16 denotes an annular heating element that melts and cuts the exhaust pipe 2 in the vicinity of the stem portion 3. The heating element 16 is inserted into the exhaust pipe insertion hole between the glass tube support portion 4 and the exhaust pipe insertion portion 6. 5 and the exhaust pipe insertion part 6 so that their axes coincide with each other, and are covered with a heat-resistant cover 17. 18 is a water cooling jacket.

Reference numeral 19 surrounds the glass tubes 1 (20 strips in the example) supported upright on the glass tube support 4, and uniformly heats each part of the glass tubes to the high temperature required for the venting operation during venting. This glass tube heating furnace 19 is a box-shaped glass tube heating furnace for heating, and is mounted on a rail 20 so that it can be moved above the exhaust pipe insertion part 6.

Next, the operation of the present invention will be explained based on the above embodiment.

First, the exhaust pipe 2 of the glass tube 1 is inserted into the exhaust pipe insertion hole 5 of the glass tube support part 4, and the stem part 3 of the glass tube 1 is placed on the support part 4 to support it in an upright state, and at the same time, The exhaust pipe 2 is inserted into the exhaust pipe insertion part 6 located below the glass tube support part 4. After inserting the exhaust pipe 2 into the exhaust pipe insertion part 6, when the lever 11 is pushed down, the sleeve 10 engages with the lever 11.
The upper engagement pin 14 lowers the sleeve 10 and lowers the rigid ring body 9, and the cylindrical base body 7, the rigid ring body 9,
The airtight elastic ring 8 whose upper and lower surfaces and outer peripheral surface are surrounded by the three members of the sleeve 10 is pressed in the axial direction.
The airtight elastic ring body 8 pressed in this manner bulges out in the centripetal direction and tightly adheres to the outer circumferential surface of the exhaust pipe 2.

Next, the glass tube heating furnace 19 is moved above the exhaust pipe insertion part 6 and the glass tubes 1 supported in an upright state by the glass tube support part 4 are surrounded all at once, and the glass tubes 1 are heated in the heating furnace 19. All parts of the tube 1 are uniformly heated to a high temperature required for air evacuation work, and during this time, a vacuum pump (not shown) is activated to remove the air remaining in the glass tube 1 from the exhaust tube 2 to create a vacuum. When the degree of vacuum in the glass tube 1 reaches a predetermined value, the heating element 16 is heated to heat the base of the exhaust pipe 2 while continuing to remove air, and the exhaust pipe 2 is melted and cut near the stem portion 3. and occlusion at the same time.

The present invention has been described above based on the examples, but the present invention vents air from the end of the exhaust pipe provided in the slam part of the glass tube, evacuates the inside of the glass tube, and then melts the base of the exhaust pipe. A device for closing the glass tube, which includes a glass tube support part that holds the glass tube upright and supports the stem part, an exhaust pipe insertion part that inserts and supports the exhaust pipe, and melts the exhaust pipe at a position near the stem part. It consists of an annular heating element that cuts and closes, and a glass tube heating furnace that uniformly heats each part of the glass tube supported in an upright position to the high temperature required for air removal work, and the exhaust pipe insertion part that leads to the vacuum pump. In this method, an airtight elastic ring body that bulges out and comes into close contact with the outer peripheral surface of the exhaust pipe is placed concentrically with the exhaust pipe to be inserted, together with means for compressing the ring body that surrounds the outer peripheral surface and upper and lower surfaces of the ring body. Therefore, the exhaust pipe installed in the glass tube stem part inserted into the exhaust pipe insertion part has a high airtightness due to the airtight elastic ring that tightly contacts the outer peripheral surface of the pipe from the outside. Since it is maintained and communicated with the vacuum device, it is possible to prevent air from entering from around the exhaust pipe during venting and to create a high vacuum inside the glass tube in a short time. Moreover,
Since the glass tube is vented by standing the glass tube upright with the stem section placed on the glass tube support, a large amount of glass tubes can be processed simultaneously in a narrow space, and the length of the exhaust tube can be slightly reduced. Even if there is an error of
Since it has a structure that supports the stem part as described above,
It is not affected by this and can be processed uniformly. In addition, since the base of the exhaust pipe can be melted and closed using an annular heating element while supporting the stem as described above, the shape of the remaining part of the exhaust pipe is more uniform than when done manually. It is possible to easily make the length of the same part into a fixed size, and furthermore, it has the effect of contributing to uniformity of quality of the vacuum double glass tube type collector.

[Brief explanation of the drawing]

The drawings show one embodiment of the invention.
The figure is a schematic front view of the present invention, FIG. 2 is a partially enlarged side view of FIG. 1, and FIG. 3 is an enlarged cross-sectional view taken along the - line in FIG. DESCRIPTION OF SYMBOLS 1... Glass tube, 2... Exhaust pipe, 3... Stem part, 4... Glass tube support part, 6... Exhaust pipe insertion part, 7... Cylindrical base body, 8... Airtight elastic ring body , 9
... Rigid ring body, 10 ... Sleeve, 16 ... Heating element, 19 ... Glass tube heating furnace.

Claims (1)

[Claims] 1 A device that extracts air from the end of an exhaust pipe provided at the stem portion of a glass tube, creates a vacuum inside the glass tube, and then melts and closes the base of the exhaust pipe, and the device an exhaust pipe insertion part for inserting and supporting the exhaust pipe; an annular heating element for melting and cutting the exhaust pipe in the vicinity of the stem; and a glass tube supported in an upright position. It consists of a glass tube heating furnace that uniformly heats each part to the high temperature required for air removal work, and the exhaust pipe insertion part leading to the vacuum pump has an airtight structure that bulges out against the outer circumferential surface of the exhaust pipe. A vacuum sealing device for a glass tube, in which an elastic ring is provided concentrically with an exhaust pipe into which it is inserted, together with ring compression means that surrounds the outer peripheral surface and upper and lower surfaces of the ring.