JPH0545934Y2 - - Google Patents

Description

[Detailed Description of the Invention] [Industrial Application Field] The present invention relates to a sealing mechanism for a sheath type thermocouple for measuring the temperature inside a vacuum container or tank, for example.

[Prior art and its problems] Figure 2 shows a conventional thermocouple sealing mechanism.
In the figure, a sheathed thermocouple 3 for measuring the temperature inside the vacuum chamber 1 is disposed within the vacuum chamber 1, and its tip 3a serves as a thermal contact point. As is well known, the sheath type thermocouple has two different types of metal conductors inserted through the sheath 3c, and the other end is connected to the sheath 3b.
is located outside the vacuum chamber 1 and serves as a cold junction. The sheath 3c is inserted through a hole 1a formed in one side wall of the vacuum chamber 1, and further through a hole 6a in the mounting member 6 and a cap nut 9.
It is inserted through the hole 9a and sent out to the outside, and a soroban bead-shaped gasket 7 is fitted, thereby performing a sealing action between the inside 2 and the outside.

The mounting plate 4 is fixed to the side wall of the vacuum chamber 1 by bolts with a seal ring 5 attached thereto, and a packing support member 6 is fixed to this by welding. By screwing and tightening the cap nut 9 to the packing support member 6 with the packing pressing member 8 interposed, the packing 7 is held under narrow pressure between the packing pressing member 8 and the stepped portion of the stepped hole 6a of the packing supporting member 6. Ru. The gasket 7 is closely fitted to the sheath 3c of the thermocouple 3, and seals the inside and outside of the vacuum chamber 1.

Although the conventional example has the above-mentioned configuration, the following inconvenience occurs in attaching the gasket 7 to the illustrated position.

1 Generally, as the vacuum chamber becomes larger, the thermocouple 3 also becomes longer, for example, 5 to 10 mm, but the gasket 7
It is troublesome to pass the sheath 3c from the tip 3a to the base. That is, the sheath 3c is tightly fitted into the seal 7, but if the sheath 3c is irregularly bent, it will get stuck in the middle and become difficult to pass through. Further, it is troublesome to push through the hole 6a of the packing support member 6.

2. Grease may be applied to improve the sliding on the sheath 3c, but in vacuum conditions that require oil-free equipment, this grease must be wiped off.

3 If there is a scratch in the middle of the sheath 3c, the packing 7
In the process of sliding the gasket 7, the inner peripheral surface of the gasket 7 is scratched, causing leakage.

[Problems to be Solved by the Invention] The present invention has been made in view of the above-mentioned problems, and an object of the present invention is to provide a thermocouple sealing mechanism that facilitates the work of attaching the seal.

[Means for Solving the Problems] The above object is to provide a sheath type thermocouple sealing mechanism that is attached to one side wall of a sealed container and measures the temperature inside the sealed container. By a thermocouple sealing mechanism, the thermocouple sealing mechanism is characterized by fitting a cylindrical member, hermetically welding or adhering the cylindrical member to the sheath, and elastically fitting a packing around the outer periphery of the cylindrical member. achieved.

[Operation] The gasket is inserted from the tip of the thermocouple and elastically fitted into the welded or bonded cylindrical member.
This is inserted into a thermocouple seal port and introduced into a sealed container, such as a vacuum chamber.

The thermocouple is easy to install, and can be installed in about 1/5 of the time compared to conventional methods.

[Example] Hereinafter, an example of the present invention will be described with reference to FIG. Note that parts corresponding to those in FIG. 2 are designated by the same reference numerals, and detailed explanation thereof will be omitted.

In this embodiment, a cylindrical jig 13 is inserted from the distal end 3a of the sheath 3, and is airtightly fixed by welding W near the cold contact portion 3b. A leak test is conducted to confirm that no leakage occurs at this weld. The diameter of the jig 13 is larger than the diameters of the sheath 3 and the cold contact portion 3b.

In this embodiment, the packing 14 has a ring shape with a circular cross section, and is passed through one end of the sheath 3 and tightly fitted onto the outer periphery of the jig 13. The mounting plate 10 on which the seal ring 11 is attached is fixed to the side wall of the vacuum chamber 1 by bolts, and the packing support member 12 is fixed to this by welding W.

After tightly fitting the packing 14 into the jig 13, it is passed through the hole 12a of the packing support member 12, and after applying the packing pressing member 15 to the packing 14,
Screw the cap nut 16 onto the packing support member 12,
By tightening, the thermocouple 3 is attached to the vacuum chamber 1, and the seal 14 is attached to the stepped hole 12a of the seal presser member 15 and the seal support member 12.
As shown in the figure, a narrow pressure is applied between the stepped portion of the vacuum chamber 1 and the outside of the vacuum chamber 1 to ensure a reliable sealing action.

Note that the outer circumferential surface of the jig 13 is particularly
It is preferable that the portion where the two parts are tightly fitted be polished according to the required degree of sealing.

This embodiment has the above-described configuration and is assembled in the above-described manner, and has the following effects.

1. Thermocouple installation has become easier and takes about 1/5 of the time compared to conventional methods.

2. There is no need to finish the entire length of the thermocouple, reducing costs.

3 You only need to pay attention to the scratches on the jig 13.
It also becomes easier to store and handle.

4. The part of the jig 13 can be finished according to the required degree of vacuum of the vacuum device, and unnecessary processing costs can be reduced.

5. Reused thermocouples are sometimes bent and cannot be inserted, but this invention eliminates this problem.

6. If you apply grease when introducing the seal, you will have to wipe it off if your vacuum equipment requires oil-free operation, but this becomes unnecessary.

7. Since the jig component 13 is sufficiently machined, the vacuum sealing effect can be fully exhibited.

Although the embodiments of the present invention have been described above, the present invention is of course not limited thereto, and various modifications can be made based on the technical idea of the present invention.

For example, in the above embodiments, the thermocouple sealing mechanism was applied to the vacuum chamber 1, but the present invention is not limited thereto, and the present invention can also be applied to, for example, a sealed container whose interior is at a higher pressure than the atmosphere.

Further, the shape of the gasket 14 was a ring shape with a circular cross section, but instead of this, it may be a gasket in the shape of a Soroban bead as in the conventional case. Of course,
In this case, its inner diameter is larger than the diameter of the jig 13, which is larger than the sheath 3c.

[Effects of the invention] As described above, according to the thermocouple sealing mechanism of the present invention, it is easy to attach the thermocouple to a sealed container, and there is no need to straighten the entire length of the thermocouple, reducing costs. It can be lowered further.

[Brief explanation of the drawing]

FIG. 1 is a sectional view of a thermocouple sealing mechanism according to an embodiment of the present invention, and FIG. 2 is a sectional view of a conventional thermocouple sealing mechanism. In the figure, 3... thermocouple, 13... jig, 14... packing.

Claims (1)

[Scope of utility model registration request] In a sheath-type thermocouple sealing mechanism that is attached to one side wall of a sealed container and measures the temperature inside the sealed container, a cylindrical member is fitted into the sheath of the thermocouple, and the cylindrical member is attached to the sheath. A thermocouple sealing mechanism, characterized in that the thermocouple is airtightly welded or bonded, and a gasket is elastically fitted around the outer periphery of the cylindrical member.