JP3002814B2 - Method for manufacturing composite element of discharge tube and varistor - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a method for manufacturing a composite element of a discharge tube and a varistor, which can safely cope with an overvoltage applied to an electric circuit as a disturbance.

[0002]

2. Description of the Related Art Conventionally, when a discharge tube as an arrester and a varistor are integrated as a composite element, the varistor is generally made of a material that can withstand high temperatures, but a micro-gap discharge element of the discharge tube is enclosed. Since the tube body is a glass tube, room temperature processing is performed so that the glass tube is not damaged at high temperature, and therefore, each main part of the discharge tube and the varistor is housed in a plastic case, A method is employed in which a filler that cures at room temperature is placed in the case.

[0003]

In the above-described conventional method for manufacturing a composite element of a discharge tube and a varistor, since the main parts of the discharge tube and the varistor are housed in a case, the case is not used. There is a problem that the manufacturing cost is unexpectedly increased as a result of the necessity, and there is also a problem that the heat resistance of the manufactured composite element is not sufficient because it is processed at room temperature. Thus, the present invention provides a low-cost composite element of a discharge tube and a varistor by making the tube body of the discharge tube resistant to high temperatures without the need for a conventionally used case for coating an electrical insulating material. An object of the present invention is to provide a method that can be used.

[0004]

In order to solve the above-mentioned problems, a method for manufacturing a composite element of a discharge tube and a varistor according to the present invention comprises a discharge tube in which a micro gap discharge element is sealed in a tube body under reduced pressure. When manufacturing a composite element with a varistor that conducts only when a high voltage load is applied, the discharge tube body is made of metal to withstand high temperatures, and one of a pair of terminal lead wires in the discharge tube. While interconnecting one of the pair of terminal leads of the varistor with each other, and arranging the other terminal lead of the discharge tube and the other terminal lead of the varistor in a required mutual arrangement state, The main body of the discharge tube and the varistor and the interconnected terminal leads are exposed so that only the terminal leads arranged in the required mutual arrangement state are exposed. A collection of lines, and coated with an electrically insulating material by high-temperature treatment, is characterized in that integrally formed in the block-shaped.

In the above-described method of manufacturing a composite element of a discharge tube and a varistor according to the present invention, the tube in which the micro gap discharge element of the discharge tube is sealed under reduced pressure is made of a metal that can withstand high temperatures. The operation of coating the main body of the varistor and the assembly of the terminal lead wires connected to each other with an electrical insulating material by high-temperature treatment becomes easy, and the heat resistance of the composite element manufactured in this way can be obtained. . Since a case for covering the electric insulating material, which has been conventionally required, is not required, a significant cost reduction is brought about.

Further, when a thermosetting epoxy resin is used as the electric insulating material, the operation of forming the above-mentioned aggregate into an integral block shape by high-temperature treatment becomes easy, and in particular, the above-mentioned aggregate is coated with the epoxy resin. At this time, a fluid epoxy resin is attached to the same assembly, and the epoxy resin is baked by high-temperature treatment, and then the epoxy resin powder is applied to the same assembly from a plurality of nozzles arranged around the same assembly. By spraying and hardening the epoxy resin by high-temperature treatment, it becomes possible to harden the above-mentioned assembly with the epoxy resin as a heat-resistant electrical insulating material extremely efficiently and firmly.

Further, when the above-mentioned assembly is covered with an electrical insulating material, the assembly may be put into a baking mold and wrapped with the above-mentioned electrical insulating material, and formed into a block of a predetermined shape by high-temperature treatment. This is a powerful means of solving the problem, and thereby, while taking advantage of the fact that the tube of the discharge tube is made of metal, the above-mentioned assembly is covered with a heat-resistant electric insulating material by a high-temperature baking die, and has a good-looking constant. It is possible to finish the block into a shape, which can contribute to improvement in the accuracy of assembling into an electric device.

[0008]

BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 is an explanatory view showing a discharge tube and a varistor used in a method of manufacturing a composite device according to the present invention; FIG. It is a schematic diagram which shows the connection state of a varistor.

As shown in FIG. 1, a discharge tube 1 used in a method for manufacturing a composite device according to the present invention has a micro-gap discharge device 3 sealed in a metal tube 2 under reduced pressure. Terminal lead wires 4a and 4b are protruded, and one terminal 4a is provided so as to penetrate the insulating cap 5. Note that brass or the like is used as the material of the tube body 2. A varistor 6 that is conductive only when a high-voltage load is applied is formed of a material such as carbon and has a pair of terminal lead wires 7a and 7b.

In the method for manufacturing a composite device according to the first embodiment of the present invention, a pair of terminal lead wires 4 in a discharge tube 1 are provided.
a and 4b and one of the pair of terminal leads 7a and 7b of the varistor 6 are connected to each other by means such as spot welding 8 as shown in FIG. , The other terminal lead wire 4 of the discharge tube 1
An operation of arranging b and the other terminal lead wire 7b of the varistor 6 in a required mutual arrangement state which is parallel to each other and has a predetermined distance D (about 8 to 20 mm) is performed.

The main body of the discharge tube 1 and the varistor 6 and the terminal leads 4a, 7a connected to each other are exposed so that only the terminal leads 4b, 7b arranged in a required mutual arrangement state are exposed. An operation is performed in which the aggregate A is covered with an electric insulating material by a high-temperature treatment to form an integrated block.

In the present embodiment, an epoxy resin is used as the above-mentioned electric insulating material. First, the aggregate A is coated with a fluid epoxy resin (undercoat), and then subjected to a high-temperature treatment at 130 to 150 ° C. for 60 minutes. Bake hardened. Since the surface of the aggregate A subjected to such treatment is in a state where the powder easily adheres, in the next step, the epoxy resin powder was sprayed on the aggregate A from a plurality of nozzles around the aggregate A. Thereafter, it is subjected to a high temperature treatment at 100 to 150 ° C. for 60 to 90 minutes, and is baked.

In the above-described method for manufacturing a composite element of a discharge tube and a varistor according to the present embodiment, the tube 2 in which the micro gap discharge element 3 of the discharge tube 1 is sealed under reduced pressure is made of a metal that can withstand high temperatures. Discharge tube 1 and varistor 6
And the main body and the mutually connected terminal lead wires 4a,
The operation of coating the assembly A of FIG. 7a with an electric insulating material by the high-temperature treatment becomes easy, and the heat resistance of the composite element manufactured in this manner can be obtained. Since a case for covering the electric insulating material, which has been conventionally required, is not required, a significant cost reduction is brought about.

Further, since a thermosetting epoxy resin is used as the electrical insulating material, the operation of forming the aggregate A into an integral block shape is facilitated.
Since it is baked and hardened by a high-temperature treatment after adhesion (application) of the fluid epoxy resin and a high-temperature treatment after spraying of the epoxy resin powder, the aggregate A is extremely efficiently and strongly used as a heat-resistant electrical insulating material. Can be baked with epoxy resin.

Next, a second embodiment of the present invention will be described. In this embodiment, as in the first embodiment, as shown in FIG. 2, a metal tube (see reference numeral 2 in FIG. 1) And the varistor 6 are connected by spot welding to one terminal lead wires 4a and 7a, respectively.
Although it is folded into a letter shape, when the assembly A is coated with an epoxy resin as an electric insulating material by a high temperature treatment so as to be integrated, the following means is adopted.

3 (partial plan view) and FIG.
As shown in (side view), a large number of baking dies 10 interconnected by hinges 9 are formed endlessly, and
It is configured to revolve like a conveyor via a rotation driven member 11 and a rotation driven member 12, and a main part thereof is provided with a heating source 13 such as an electric heater for appropriately heating the baking mold 10.

Then, a small amount of the fluid epoxy resin is put into the baking mold 10, and when the assembly A is slightly hardened, the assembly A is placed thereon, and then the fluid epoxy resin is further placed thereon. Thus, the effect of baking is performed.

The product of the composite element in which the assembly A is integrated as described above is separated from the baking mold 10 while descending along the rotary drive member 11, and is dropped onto the lower conveyor 14 and sent out. It has become.

In the above-described second embodiment, the assembly A is made of a heat-resistant electric insulating material (epoxy resin) by the high-temperature baking mold 10 while taking advantage of the fact that the tube 2 of the discharge tube 1 is made of metal. It is possible to finish the block having a good appearance and covered with a uniform shape, which contributes to the improvement of the assembling accuracy in the electric equipment.

[0020]

As described above in detail, the following effects can be obtained by the method for manufacturing a composite element of a discharge tube and a varistor according to the present invention. (1) Since the tube in which the micro-gap discharge element of the discharge tube is sealed under reduced pressure is made of a metal that can withstand high temperatures, the discharge tube and the varistor body and the aggregate of terminal leads connected to each other Is easily treated by high-temperature treatment with an electrical insulating material, and the heat resistance of the composite element manufactured in this way can be obtained. Since a case for covering the electric insulating material, which has been conventionally required, is not required, a significant cost reduction is brought about. (2) When a thermosetting epoxy resin is used as the electrical insulating material, the operation of forming the aggregate into an integral block shape by high-temperature treatment becomes easy. (3) When coating the above-mentioned aggregate with an epoxy resin, a liquid epoxy resin is adhered to the same aggregate, and the epoxy resin is baked by a high-temperature treatment, and then a plurality of the epoxy resin are arranged around the same aggregate. When the epoxy resin powder is sprayed from the nozzle onto the assembly and the epoxy resin is baked and hardened by high-temperature treatment, the assembly is extremely efficiently and strongly baked with an epoxy resin as a heat-resistant electrical insulating material. Be able to harden. (4) While taking advantage of the metal body of the discharge tube,
In a method of manufacturing the composite element by finishing the assembly into a block coated with a heat-resistant electrical insulating material by a high-temperature baking mold, the composite element has a good-looking constant shape and is inserted into an electric device. Can be improved.

[Brief description of the drawings]

FIG. 1 is an explanatory view showing a discharge tube and a varistor used in a composite device manufacturing method of the present invention.

FIG. 2 is a schematic view showing a connected state of a discharge tube and a varistor of FIG. 1;

FIG. 3 is a plan view of a main part showing an arrangement state of firing molds used in the composite device manufacturing method of the present invention.

FIG. 4 is a side view showing the entire configuration of the baking mold of FIG.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Discharge tube 2 Tube 3 Micro gap discharge element 4a, 4b Terminal lead 5 Insulating cap 6 Varistor 7a, 7b Terminal lead 8 Spot welding 9 Hinge 10 Baking mold 11 Rotary driving member 12 Rotary driven member 13 Heat source 14 Transport Conveyor A aggregate

──────────────────────────────────────────────────続 き Continuation of the front page (56) References JP-A-5-283140 (JP, A) JP-A 62-201490 (JP, U) (58) Fields investigated (Int. Cl. ⁷ , DB name) H01T 1/00-4/20

Claims (4)

(57) [Claims] When manufacturing a composite element of a discharge tube in which a micro gap discharge element is sealed in a reduced pressure state inside a tube and a varistor that conducts only when a high voltage load is applied, the tube of the discharge tube is used. It is made of metal to withstand high temperatures, and one of the pair of terminal leads of the discharge tube and one of the pair of terminal leads of the varistor are interconnected, and the other terminal lead of the discharge tube is connected. After arranging the wires and the other terminal lead wires of the varistor in a required mutual arrangement state, only the terminal lead wires arranged in the required mutual arrangement state are exposed,
The assembly of the main body of the discharge tube and the varistor and the interconnected terminal lead wires are covered with an electric insulating material by a high-temperature treatment, and are formed into an integrated block. A method for manufacturing a composite element of a discharge tube and a varistor. 2. The method according to claim 1, wherein the electric insulating material is an epoxy resin. 3. When coating the above-mentioned assembly with an epoxy resin, a fluid epoxy resin is adhered to the assembly, and the epoxy resin is baked and hardened by a high-temperature treatment, and then placed around the assembly. 3. The method according to claim 2, wherein the epoxy resin powder is sprayed onto the assembly from a plurality of nozzles, and the epoxy resin is baked and solidified by high-temperature treatment. 4. When covering the above-mentioned aggregate with an electric insulating material, forming the same into a baking mold and wrapping it in the above-mentioned electric insulating material while forming the same into a block of a predetermined shape by high-temperature treatment. The method for producing a composite element of a discharge tube and a varistor according to claim 1, wherein: