JPH0128638Y2 - - Google Patents

Description

[Detailed explanation of the idea] The present invention relates to a coaxial arrester for lightning damage prevention.

A common television reception system is widely used as a means of resolving the difficulty in viewing television radio waves. This TV joint reception system receives radio waves with a common parent antenna, amplifies them to the required level, and distributes them to each household via coaxial lines.
Since one main antenna and multiple amplifiers provide TV reception for many households, it is desirable to have as few failures as possible, but in the past, devices such as amplifiers were prone to failure in the event of a lightning strike.
The damage caused was extremely high.

That is, the amplifier is a device inserted between the main antenna and the lead-in line, and as an operating power source, power adjusted to the required voltage (AC 30V) is supplied from an external power supply device (PI) through a coaxial line. When lightning strikes there, lightning current is induced into the power lines and from there through the coaxial lines to the equipment. Of this, the amount that enters the power supply device through the power line can be removed by the lightning transformer installed in the device, so there is no problem. However, since it is impossible to prevent the coaxial line from flowing into the coaxial line, it directly flows into the amplifier main body, seriously damaging the main body components.

As a countermeasure against this, in the past, a button-shaped arrester D was attached and wired to the equipment board constituting the input/output section of the amplifier, as shown in the circuit diagram in Figure 10. When a large current of 100 amperes flows instantaneously, the input/output circuit board itself melts and evaporates, making it almost ineffective and resulting in equipment failure. and,
Since lightning strikes are particularly common in mountainous areas, it takes a great deal of time and effort to repair breakdowns, and it also costs a huge amount of money.

This invention was devised after repeated research based on the above-mentioned circumstances, and can extremely reliably prevent lightning current from flowing into equipment simply by inserting it between the coaxial line and the equipment input/output. The objective is to provide a practical coaxial arrester that exhibits particularly good durability against vibrations and shocks applied in the axial direction and expansion during lightning strikes, and is highly effective in preventing lightning damage to television public reception facilities. .

For this purpose, the present invention provides a cylindrical outer conductor with connection seats for the coaxial line and equipment at both ends, and a gas sealing part filled with a gas having overvoltage discharge performance through an insulating piece. In the stopping part, a center conductor divided into left and right parts is inserted into an insulating piece through a cushion, and the lightning current passing through the coaxial line is discharged from the center conductor through the filled gas, absorbed by the outer conductor, and The cushion material absorbs vibrations and shocks applied to the conductor and expansion of the center conductor.

Embodiments of the present invention will be described below with reference to the accompanying drawings.

Figures 1 and 2 show an embodiment of a coaxial arrester for lightning damage prevention according to the present invention, in which 1 is a metal cylindrical outer conductor, with a coaxial line A and an amplifier connected to the TV set at both ends. Connection seats 4, 4' for equipment B for the communal reception facility are provided. The connecting seats 4, 4' may both be female, or may be female and male. In this embodiment, since both are female, female threads 5, 5 are provided at the ends of the outer conductor 1.
The cylindrical male threaded portions 42, 42 of the connection seat main body 41 are screwed into the female threads 5, 5.

Reference numeral 2 denotes a gas sealing portion formed inwardly from the connection seats 4, 4' in the external conductor 1, and argon, It is filled with an inert gas such as neon that has overvoltage discharge performance.

In this embodiment, as a structure for obtaining the gas sealing portion 2, insulating pieces 6, 6' are integrally joined to a thin cylinder (inner cylinder) 11 via a metal such as a vapor deposited film. The required gas is sealed inside the inner cylinder 11 sealed at 6', and the inner cylinder 11 is connected to the outer cylinder 10.
The outer conductor 1 is obtained by tightly fitting the inner conductor.

3 and 3' are rod-shaped or pipe-shaped left and right center conductors (inner conductors) provided in the gas sealing part 2, and are made of suitable material such as tungsten, degassing copper SUS material, or KOV with nickel plating. The insulating pieces 6, 6' are made of a material that is supported through a hole provided in the center of the insulating pieces 6, 6'.
Relay members 7, 7 are fixed to the lead portions extending outward through 6'. A ring-shaped insulator 8 attached to the cylindrical male threaded portion 42 of the connection seat body 41 is fitted onto the outer periphery of the relay members 7, 7, thereby firmly holding the center conductors 3, 3'. That's what I do.

Figures 3 and 4 show another embodiment of the present invention, in which the structure of the gas sealing part or the structure of the external conductor does not use an inner tube, and Insulating pieces 6, 6', which penetrate the left and right center conductors 3, 3', are directly fixed to the conductor 1 via vapor-deposited metal or the like, and gas sealing portions 2 are formed by venting the gas. The rest of the structure is the same as that of the embodiment shown in FIGS. 1 and 2, so it will only be shown with reference numerals.

Although the basic structure of the present invention is as described above, the present invention further provides that the left and right center conductors 3, 3' inserted into the interior through the insulating pieces 6, 6' are connected to a cushion material such as a coil spring. The feature is that they are connected via 9.

5 to 7 show the embodiments thereof. First, in FIG. 5, the left and right center conductors 3, 3' are inserted into the center of the insulating pieces 6, 6' and fixed, and the center conductors 3, 3 A cushion material 9 is interposed between the opposing end surfaces 31, 31' of the conductors 3', and a conductor sleeve 32 is attached to the outer periphery of the left and right center conductors 3, 3' so as to enclose the cushion material 9.

FIG. 6 shows that the left and right center conductors 3, 3' are inserted into the center of the insulating pieces 6, 6', and the center conductors 3, 3' are fixed.
A dog-shaped receptor (stopper) 33, 3 is placed at the tip of 3'.
3' are fixed so as to face each other, and a cushion material 9 is interposed between the cup-shaped receivers 33, 33'.

In FIG. 7, contact pieces 34, 34' are fixed to the tips of the left and right center conductors 3, 3', and a sleeve body 35 is inserted and fixed to the insulating piece 6 corresponding to at least one center conductor 3. The center conductor 3 is slidably inserted into the sleeve body 35, and a cushion material 9 is interposed around the center conductor between the front end of the sleeve body 35 and the contact piece 34. In this embodiment, the sleeve body 35' is also inserted into and fixed to the other insulating piece 6',
A center conductor 3' is inserted and fixed into this sleeve body. A joining portion for the relay member is formed at the rear end of the sleeve body 35, 35'.

In other drawings, reference numeral 12 is a retaining ring with a thread cut on the outer periphery, which is screwed onto the female thread 5 of the outer tube 10 to press down the inner tube 11 from both sides and improve contact with the external conductor. . 13 is a seal ring interposed between the connection seats 4, 4' and the outer conductor 1.

Since the present invention has the above-mentioned configuration, in use, the present arrester E is inserted between the coaxial line A and the input/output of a device such as an amplifier B. As shown in the figure, one connection seat 4 is used to connect to the input side terminal b of equipment B, and the other connection seat 4' is used to connect to the connector a of the coaxial line (coaxial cable) A, and the power supply C
This is an intervening connection between the coaxial line A' led out from the output side of the device B and the power supply terminal b' of the device B. These operations are extremely easy since connection seats 4, 4' are provided at both ends of the external conductor 1, and all that is required is to insert the contact springs or contacts of the terminals and plugs into the relay member 7. The structure and wiring can be left as they are and can be done at low cost since no modification is required. Even if an axial force such as strong vibration or shock is applied to the center conductors 3, 3' during connection, the center conductors 3, 3' are divided into two parts, and they are connected by the cushion material 9. Therefore, the cushion material 9 absorbs the force in the axial direction and is less likely to be damaged.

Therefore, in normal times, the television signal received by the receiving antenna is transmitted from the main line through the coaxial line A and the connector a to the center conductor 3 of the arrester of the present invention.
3' and external conductor 1, from which it is inserted into device B via input terminal b, where it is amplified to a required level, branched, and distributed.

Then, a lightning strike occurs, and the lightning current flows through the coaxial line A.
A', this lightning current is transmitted from the relay member 7 to the center conductor 3 through the center conductors of the connectors a and a', and when it reaches a constant voltage, it is discharged to the gas sealing part 2 and external It flows into the conductor 1 and is absorbed. At this time, the discharge occurs over a wide area around the entire circumference of the center conductors 3, 3', so it can sufficiently withstand large surge voltages, and therefore the lightning current flowing through the center conductors 3, 3' will not reach the equipment. It is efficiently removed before it enters the equipment, resulting in very little of it entering the equipment. Even if a small amount flows in, it will not be a problem as it will be absorbed by the internal arrester.

Furthermore, when the center conductor is composed of a single shaft, the lightning current that passes through the center conductor dissipates in the radial direction, causing high heat in the center conductor. There is a danger that the insulating pieces 6, 6' may be stretched and the penetrating fixed portions of the insulating pieces 6, 6' may be damaged, causing the sealed gas to leak, or the insulating pieces 6, 6' may be bent and damaged. However, in the present invention, the center conductor is divided into left and right center conductors 3 and 3', and the cushion material 9 is arranged between the end faces in FIGS. 5 and 6, and on the outer periphery in FIG. death,
This cushion material 9 allows the left and right center conductors 3,
3' are connected. Therefore, even if the left and right center conductors 3, 3' are expanded in the axial direction due to thermal expansion due to the passing dissipation of lightning current as described above, this expansion can be automatically absorbed by the cushion material 9. Do not apply excessive force to the insulation piece 6.6'. When the lightning current is absorbed by the outer conductor 1 and the center conductors 3, 3' are cooled, the pressing force of the cushion material 9 automatically restores the original state. Therefore, stable work can be performed over a long period of time with few breakdowns.

According to the present invention described above, it is possible to reliably prevent failure of television receiving equipment due to lightning current with an extremely simple structure, and to ensure stable operation over a long period of time. This has the excellent effect of reducing

[Brief explanation of drawings]

Fig. 1 is a longitudinal sectional side view showing one embodiment of the coaxial arrester for lightning damage prevention according to the present invention, Fig. 2 is a sectional view taken along the line shown in Fig. 1, and Fig. 3 is another embodiment of the arrester of the present invention. FIG. 4 is a cross-sectional view taken along the line of FIG. Figure 9 is a side view illustrating the state of use of the
Figure 0 is a wiring diagram showing a conventional lightning damage prevention system. 1...Outer conductor, 2...Gas sealing part, 3, 3'
... Left and right center conductors, 4, 4' ... Connection seat, 6,
6'...Insulating piece, 9...Cushion material.

Claims (1)

[Claims for Utility Model Registration] 1. A cylindrical external conductor 1 with connecting seats 4, 4' for the coaxial line A and equipment B provided at the ends thereof, through insulating pieces 6, 6' to provide overvoltage discharge performance. A gas sealing section 2 is provided in which a gas is filled, and left and right center conductors 3, 3' are inserted into insulating pieces 6, 6' through a cushion material 9 in the gas sealing section 2. Coaxial type arrester for lightning damage prevention. 2. The thunderbolt according to claim 1, wherein the cushion material 9 is interposed between the end faces of the left and right center conductors 3, 3', and the conductor sleeve 32 is attached to the outer periphery of the center conductors 3, 3'. Coaxial type arrester for harm prevention. 3. A coaxial arrester for lightning damage prevention according to claim 1, wherein the cushion material 9 is housed in the circular receivers 33, 33' provided at the tips of the left and right center conductors 3, 3'. 4 Center conductors 3, 3' have abutment pieces 34, 3 at their tips
4', and at least one center conductor 3 or 3' is inserted into the sleeve body 35 inserted into the insulating piece 6, and the sleeve body 35 and the abutting piece 3
4. A coaxial arrester for lightning damage prevention according to claim 1, wherein a cushion material 9 is attached to the outer periphery of the center conductor between the center conductors 4 and 4.