JPS6345740Y2 - - Google Patents

Description

[Detailed description of the invention] The present invention comprises a conductive lower support pipe equipped with a conductor lead-out fitting, a lightning rod connection fitting at the upper end, and a conductive conductor having an outer diameter smaller than the inner diameter of the lower support pipe. Different diameter pipe connection structure for lightning arrester equipment in which the upper support pipe and the upper support pipe are fixedly connected concentrically or almost concentrically with the lower end of the upper support pipe fitted into the upper end of the lower support pipe. Regarding.

A conventionally common pipe connection structure of different diameters for this type of lightning protection equipment is shown in FIG. To explain the structure in detail, a conductive lower support tube 02 made of brass or the like is provided with a conductor lead-out fitting 01, and a lightning rod connection fitting 03 is provided at the upper end, and the inner diameter is smaller than the inner diameter of the lower support tube 02. By drawing the upper end portion 02A of the lower support tube 02 while fitting the lower end portion of the conductive upper support tube 04 having an outer diameter of were fixedly connected concentrically or almost concentrically.

In such a conventional connection structure for different diameter pipes, the upper end portion of the lower support tube is drawn, so residual stress remains in that portion, and furthermore, that portion is thermally applied by brazing or welding. Since the joint is connected to the wafer, the strength of the joint is extremely weak. As a result, if the device is installed on a rooftop, etc., it will be constantly exposed to wind and rain, and the connection will be constantly exposed to the wind and rain, and the load will always be concentrated on the connection. However, it gradually weakened and had the disadvantage of being unreliable in terms of longevity.

In view of the above circumstances, the present invention provides a unique structure for lightning protection equipment in which the outer diameter of the upper support pipe is smaller than the inner diameter of the lower support pipe, and the fixed connection between the two has excellent mechanical strength. The purpose is to provide a radial pipe connection structure.

The characteristic configuration of the different diameter pipe connection structure for lightning arrester equipment according to the present invention, which has been made to achieve the above object, is that an outer diameter equal to or almost equal to the inner diameter of the lower support pipe is attached at an appropriate position to the lower end portion of the upper support pipe. A cylindrical member of the same diameter is externally fitted and fixed, and a plurality of holes are formed in the circumferential direction at appropriate positions in the upper end portion of the lower support tube, and the lower support tube and the cylindrical member are connected through the holes. Both support tubes are fixed together by brazing, and a cap is attached to the upper end opening of the lower support tube.

The effects of the present invention having such a characteristic configuration are as follows.

In other words, by externally fitting and fixing a cylindrical member with an outer diameter equal to or almost equal to the inner diameter of the lower support tube to the upper support tube, the two support tubes can be connected without drawing as in the conventional method. They can be fitted with the inner and outer diameters being approximately equal.

For this reason, fixed connection by brazing is performed with very little residual stress. In addition, since brazing is performed through the hole, there is less residual heat influence due to brazing compared to the conventional structure in which brazing is performed around the entire circumference of the fixed connection part of both support tubes. It can be fixed while securing the necessary fixing force. As described above, we have been able to provide a product with improved mechanical strength by minimizing the effects of processing and heat for fixing.

In addition, since a cap is attached to the upper end opening of the lower support tube, when the lightning rod is installed on the roof, it prevents rainwater or soot from entering the fitting gap, and both support tubes are closed. It is possible to maintain conductivity between the two and to prevent corrosion caused by rainwater that would adversely affect the bonding state between the two.

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

In FIGS. 1A and 1B, 10 is a lightning rod having a male thread for screwing at its lower end, and a conductive lower support tube 2 made of brass equipped with a lead-out fitting 1 for conducting wire 9;
A conductive upper support tube 4 made of brass and having a connecting fitting 3 screwed into the lightning rod 10 at the upper end and having an outer diameter smaller than the inner diameter of the lower support tube 2 is connected to the lower end portion of the upper support tube 4. 4A is fitted into the upper end portion 2A of the lower support tube 2 and fixedly connected concentrically or approximately concentrically. For this fixed connection, cylindrical members 5, 5 having an outer diameter equal to or almost equal to the inner diameter of the lower support tube 2 are fitted at two locations, one at an appropriate position of the lower end portion 4A of the upper support tube 4 and the lowest end. In addition, three holes 6 are formed in the circumferential direction at appropriate positions in the upper end portion 2A of the lower support tube 2, and these holes 6
Both the support tubes 2 and 4 are fixed together by brazing the lower support tube 2 and the upper cylindrical member 5 through each other. Reference numeral 8 denotes a fall prevention pin that comes into contact with the lower end surface of the upper support tube 4, and is inserted and fixed into the lower support tube 2.

The upper end opening of the lower support tube 2 has a through hole 7a through which the upper support tube 4 passes, and a stepped fitting portion 7b that fits into the stepped fitting portion 2b of the upper end 2A of the lower support tube. The cap 7 and the upper support tube 4 are fixedly connected by brazing at the contact portion between the through hole 7a and the outer diameter of the upper support tube 4.

2 to 5 each show another embodiment of the cap 8 in a crowned state, and FIG. 2 shows the cap 7 integrally connected with the cylindrical member 5, Brazing is performed between the support tubes 2 and the cap 7 through the hole 6, and the support tubes 2 and 4 are integrally connected. In the case shown in FIG. 3, both of the fitting portions 2b and 7b are tapered and notched so as to be in contact with each other. In the case shown in FIG. 4, both the fitting portions 2b and 7b are fitted without being stepped. In the one shown in FIG. 5, both fitting portions 2b and 7b are provided with female threads and male threads that screw into each other, respectively.

[Brief explanation of the drawing]

The drawings show an embodiment of the different diameter pipe connection structure for lightning arrester equipment according to the present invention. FIG. 6 is a partially cutaway vertical front view showing a conventional example. DESCRIPTION OF SYMBOLS 1... Conductor extraction fitting, 2... Conductive lower support pipe, 2A... Upper end part, 3... Lightning rod connection fitting,
4... Conductive upper support tube, 4A... Lower end portion, 5
... Cylindrical member, 6 ... Hole, 7 ... Cap, 8 ...
...Pin to prevent falling.

Claims (1)

[Claims for Utility Model Registration] A conductive lower support pipe 2 equipped with a conductor 9 lead-out fitting 1 and a lightning rod 10 connecting fitting 3 at the upper end, the outer diameter of which is smaller than the inner diameter of the lower support pipe 2. A lightning arrester in which a conductive upper support tube 4 and a conductive upper support tube 4 are fixedly connected concentrically or almost concentrically with the lower end portion 4A of the upper support tube 4 fitted into the upper end portion 2A of the lower support tube 2. This is a different diameter pipe connection structure for equipment, in which a cylindrical member 5 having an outer diameter equal to or approximately equal to the inner diameter of the lower support pipe 2 is externally fitted and fixed at an appropriate position of the lower end portion 4A of the upper support pipe 4. At the same time, a plurality of holes 6 are formed in the circumferential direction at appropriate positions in the upper end portion 2A of the lower support tube 2,
The lower support tube 2 and the cylindrical member 5 pass through this hole 6.
A different diameter pipe connection structure for lightning arrester equipment, in which both the support tubes 2 and 4 are fixed together by brazing with a cap 7, and a cap 7 is attached to the upper end opening of the lower support tube 2. The different diameter pipe connection structure for lightning arrester equipment according to the utility model registration item, wherein the lower support pipe 2 is provided with a fall prevention pin 8 that comes into contact with the lower end surface of the upper support pipe 4.