JPS5931019Y2 - hermetic insulation device - Google Patents

Description

[Detailed description of the invention] This invention relates to an airtight insulating device used, for example, when energizing electrical equipment housed in a metal airtight container.In particular, this invention relates to an airtight insulating device that is housed together with a cooling medium such as Freon in an airtight container. The present invention relates to an airtight insulating device for carrying a large current, which is suitable for electrically connecting a large current semiconductor rectifying element or a compressor for a refrigerator while maintaining airtightness.

Airtight insulation devices used for the above applications are required not only to have airtightness and insulation properties, but also to have cold and mechanical impact strength, corrosion resistance against cooling media, etc., and in particular, to not cause deterioration over time. However, in addition to this, it must be easy to attach to the vessel wall, and there must be a method for attaching it that will not cause leakage of the medium during the process and that can maintain its function stably for a long period of time. In order to satisfy this condition, the insulated terminal itself must necessarily have a shape and structure that can meet the above condition.

Airtight insulated terminals conventionally used for this purpose generally have a structure in which a current-carrying conductor is disposed within the through-hole of a base having a through-hole in the center, and an insulator is interposed in the space.

In this case, the first problem is the insulator.

Insulators using organic resins or rubber materials have unavoidable deficiencies in terms of corrosion resistance against cooling media and retention of airtightness over time. However, it is almost impossible to use it in actual equipment such as evaporative cooling equipment because it has unavoidable and fatal defects.

In this regard, products using glass or porcelain as materials have almost no of the above drawbacks, but in the case of glass, the cold and heat strength decreases extremely as the diameter of the current-carrying conductor increases, so it is difficult to actually manufacture the material. The diameter of the current-carrying conductor is approximately 4 mm.
The reality is that φ is the limit, and an insulated terminal for large currents cannot be obtained.

Also, items using porcelain have problems with thermal and mechanical impact strength, especially those with thick current-carrying conductors.
The equipment mounted on the wheels has a fatal flaw that makes them unusable due to their poor mechanical impact strength.

In this regard, products using glass or mica plastic bodies as insulators maintain airtightness, insulation, thermal and mechanical impact strength, corrosion resistance against cooling media, and are extremely stable against aging. However, there are many problems in attaching a metal airtight container to the container wall, including the dimensions and the method of connecting it to the conductor.In particular, mounting to the container wall is technically difficult and requires a lot of machining. For some reason, it was expensive and had a fatal flaw in that it could not be used with anything other than special equipment.

An airtight insulated terminal using this glass or mica plastic body as an insulator will be explained below.

Glass and mica plastic bodies use mica powder as a raw material, a transition temperature of about 350 to 400℃, and a softening temperature of 500 to 5℃.
This insulator is made by using a mixed powder of glassy powder with a low melting point of about 50° C., heating this raw material powder to a temperature at which the glassy material can flow under pressure, and press-molding it in the heated state.

A conventional airtight insulating terminal and airtight insulating device using this glass or mica plastic body as an insulator will be explained with reference to FIG.

Figure 1 is a cross-sectional view showing the manufacturing process of a conventional airtight insulated terminal. FIG. 2, which is a diagram showing the structure of the insulating device, is a bottom view of the airtight insulating terminal.

As shown in FIG. 1A, a current-carrying conductor 1 and a base 2 having a through hole 2a in the center are heated to a temperature higher than the transposition temperature of glass, and a mold is also heated to a temperature higher than the transposition temperature. (not shown), pressurize the raw material powder heated to a temperature that allows it to flow by pressurization as described above in a heated state,
As shown in FIG. 1A, an insulator 3 made of glass or mica plastic is press-fitted to surround the gap between the current-carrying conductor 1 and the through-hole 2a of the base 2 and surrounding the current-carrying conductor 1.
is formed.

Next, the actual installation on the vessel wall will be explained with reference to the airtight insulator used in Figure 1.

The molded product shown in FIG. 1A is machined to form a processed insulator 3a and a welded wall 4 as shown in FIG.

On the other hand, a wall 6 is provided on the container wall 5 of the container, and the end portions of the wall 6 are joined by welding 7 to complete the installation.

The reason why the welding wall 4 and the mounting wall 6 are provided as a thin wall portion is to prevent the temperature of the entire airtight insulated terminal, particularly the insulator 3, from rising due to heat during welding.

In this way, conventional devices require complicated machining of both the airtight insulated terminal and the container wall, and also require a special welding method, making them difficult to use widely in practice. There was a flaw.

In order to eliminate the above-mentioned drawbacks, this invention fundamentally changed the molded product structure of the airtight insulated terminal itself, and the basic structure was also changed accordingly to create an airtightness that can be used easily and stably. The purpose is to provide an isolation device.

An embodiment of this invention will be described below with reference to FIGS. 3 and 4.

FIG. 3 is a longitudinal cross-sectional view of one embodiment of this invention, showing the center line Y--
A on the left side of Y shows the structure of an airtight insulated terminal, and the opening on the right side shows the structure of an airtight insulating device that is attached to the vessel wall and connected to a conductor.

FIG. 4 is a bottom view of the airtight insulated terminal.

In FIG. 3, the lower part is placed inside the container.

The current-carrying conductor 1 has conductor screws 10 a and 10 on both sides.
Use one with b.

10a is a right-handed thread, and 10b is a left-handed thread.

The base body 2 has a regular hexagonal tightening seat 8 on the upper part of the outer periphery, a tapered joining screw 9 on the lower part thereof, and a through hole 2a in the center.

The insulator 3 is made of glass and mica plastic as in the conventional product, and is molded using a molding die (not shown) in the same manner as the conventional product shown in FIG. Manufacture the structure shown in Figure A.

On the other hand, a tapered female screw 5a is provided in the container wall 5 of the container, and the screws 9 and 5a are screwed together at the tightening seat 8 to complete the installation.

The conductor 13 is passed through the washer 12 by nuts 11a and llb.
installed.

Since the conducting wire screw 10a is right-handed and the conducting wire screw 10b is left-handed, there is no fear that the joining screw will loosen when the conducting wire is joined.

With the above configuration, the airtight insulated terminal that has been formed can be attached to the container wall without any complicated machining, and the connecting screw can be completely tightened without loosening when attaching the conductor. is possible,
Due to the easy and simple installation of the device wall, this hermetic insulating device has come to be widely used in many devices, and the drawbacks of conventional products, including cost, have been eliminated.

In the above explanation, the connecting screw 9 is directly screwed onto the screw 5a, but there is no problem in wrapping the sealing material between them, and the tapered screw can be made into a straight screw to connect the tightening seat 9 and the vessel wall. It is also possible to use a backing material between 5 and 5.

It is also possible to provide a ring-shaped curved portion at the bottom of the base body, and a saucer portion to the vessel wall, and to join by applying pressure to the joint surfaces.

Furthermore, in the above explanation, the object is to be attached to a container containing a liquid medium, but the invention is not limited to this, but is also applicable to containers filled with high-pressure gas, large-sized corrosion prevention equipment, etc. Yes, there is a wide range of mothers.

Although it is explained that low melting point glass is used as the raw material glass for glass and mica plastic bodies, it goes without saying that glass with a high melting point may be used depending on the purpose.

[Brief explanation of the drawings] Figure 1 is a vertical cross-sectional view showing the structure of the conventional product, A is a diagram showing the airtight insulated terminal molded product, A is a diagram showing the airtight insulation device, and A is a diagram showing the airtight insulating device.
The figure is a bottom view of a conventional airtight insulated terminal, FIG. The figure is a bottom view of an airtight insulated terminal according to an embodiment of this invention. In the figure, 1 is a current-carrying conductor, 2 is a base, 2a is a through hole, 3 is an insulator made of glass or mica plastic, 5 is a vessel wall, 5a
9 is a female screw, 10a is a right-handed screw, 10b is a left-handed screw, 11 a and 11 b are nuts, 12 is a washer, and 13 is a conductive wire. Note that the same reference numerals in the drawings indicate the same or equivalent parts.

Claims (1)

[Scope of utility model registration request] An insulator formed of glass/mica plastic is installed in the gap between the through hole of the board, which has a tapered joint screw screwed into the base wall on the outer periphery, and the current-carrying conductor inserted into this through hole. The current-carrying conductor is airtightly supported by the base body with an object interposed therebetween, and a right-hand thread and a left-hand thread are provided at each end of the current-carrying conductor for screwing together a nut for connecting a conducting wire. airtight insulation device.