JPH036809Y2 - - Google Patents

Description

[Detailed Description of the Invention] [Industrial Application Field] This invention relates to a gas exhaust device for a turntable used in an anechoic chamber or the like.

[Prior art]

In recent years, in order to measure the influence of radio waves on equipment installed in automobiles or the influence of radio waves emitted from automobiles, radiation characteristics tests have been carried out at each rotation angle by placing the vehicle to be measured on a turntable in an anechoic chamber. It is done.

[Problems to be solved by this idea]

In such measurements of automobiles in an anechoic chamber, it is structurally difficult to handle the cables that make the electrical connections necessary for the radio waves or operation signals for measurement, and the hoses for exhausting automobile exhaust gas. Only one end of the gas hose was inserted through the rotating shaft of the turntable, and the other end was placed longer around the turntable's outer periphery.

For this reason, excessive force is applied to the cable or exhaust gas hose disposed around the turntable, causing it to be twisted, which may impede measurement.

Therefore, this invention solves the problems of the prior art as described above, and functionally arranges cables and exhaust gas hoses when carrying out measurements with a car mounted on a turntable in an anechoic chamber. To provide a gas exhaust device for a turntable that allows smooth measurement work without applying excessive force to a cable and an exhaust gas hose even while the turntable is rotating.

[Structure of the idea]

The gas exhaust device for the turntable according to this invention is arranged on the lower surface of the turntable concentrically with respect to the rotating shaft so as to be able to rotate together with the turntable, and extends to the outer periphery of the upper surface of the turntable. a donut ring-shaped upper suction chamber having an exhaust gas inlet communicating with the butt joint; and an exhaust gas which is rotatably sealed and loosely fitted into the suction chamber and extends outside the turntable device. It is characterized in that it is equipped with a torrent ring-shaped lower suction chamber that has an exhaust gas outlet that communicates with a gas duct, and that the power cord and communication cable are inserted through the hollow part of the rotating shaft.

〔Example〕

The invention will be explained below with reference to the illustrated embodiments.

A plan view and a sectional view of the embodiment are shown in FIGS. 1 and 2, in which a turntable 1 installed in an anechoic chamber projects upward from a base 2 with a rotation axis 3 as the center. turntable 1
It is rotatably supported by a plurality of support rollers 4 that are in rolling contact with the lower surface. Further, the base 2 is provided with a friction drive section 5, and the turntable 1 is controlled to rotate freely by a driving force transmitted from the friction drive section 5 to the lower surface of the turntable 1.

A car 8 to be measured is placed on the turntable 1, and exhaust gas from an exhaust pipe is led to a socket 6 opened on the top surface of the turntable 1 through an exhaust gas hose 7.

FIG. 3 shows a partially enlarged sectional view of the vicinity of the rotating shaft 3 of the turntable 1. Here, the exhaust gas taken in from the socket 6 on the top surface of the turntable 1 is introduced into the suction chamber 9 from the cap 16 at the socket joint 15 through the exhaust gas intake port 17. The suction chamber 9 is composed of an upper suction chamber 10 and a lower suction chamber 11 shown in FIGS. 4a and 4b.
As shown in the exploded perspective view of the figure, they fit into each other in the vertical direction to form a donut ring-shaped volume space.

Among these, the upper suction chamber 10 is connected to the turntable 1.
It is mounted coaxially with the rotating shaft 3 and rotates together with the turntable 1, and is fixed on the base 2 so that the upper suction chamber 10 is rotatably fitted while the lower suction chamber 11 is sealed with a sealing 12. has been done. That is, regardless of the rotation of the turntable 1, the exhaust gas from the automobile 8 is introduced into the suction chamber 9 through the exhaust gas hose 7, the socket 6, the socket joint 15, the cap 16, and the exhaust gas intake port 17. be done. In addition, the lower suction chamber 11 includes an exhaust gas duct 1 extending outside the anechoic chamber.
3 is attached, and the exhaust gas in the suction chamber 9 is discharged to the outside of the anechoic chamber.

In addition, the power cord, communication cable 14, etc. that connect the car 8 with the outside of the anechoic chamber are arranged through the hollow part of the drive shaft 3 as shown in Fig. 3, and the rotation of the turntable is suppressed to about 400°. Because there are
It is not affected by twisting effects due to rotational movement.

[Effect of idea]

The gas exhaust device for the turntable according to this invention is as described above, and can provide the following effects.

When measuring noise radio waves while rotating a car on a turntable in an anechoic chamber, simply connect the exhaust gas hose 7 from the car to the exhaust gas socket 6 and the socket joint 15. Exhaust gas can be effectively released to the outside, and measurement work can be carried out smoothly without excessive force being applied or twisting on electrical measurement cables and automobile exhaust gas hoses. can.

[Brief explanation of drawings]

1 and 2 are a plan view and a sectional view of the embodiment, FIG. 3 is a partially enlarged view of FIG. 2, FIGS. The figure is an exploded perspective view of the suction chamber. 1... Turntable, 2... Bass, 3...
Rotating shaft, 4... Support roller, 5... Friction drive unit, 6... Socket, 7... Exhaust gas hose, 8... Automobile, 9... Suction chamber, 10... Upper suction chamber, 11... Lower suction chamber, 12...Sealing, 13...Exhaust gas duct, 14...Cable, 15...Socket joint, 16...Cap, 17...Exhaust gas intake.

Claims (1)

[Scope of utility model registration request] A socket joint 15 is arranged on the lower surface of the turntable 1 so as to be concentric with the rotating shaft 3 so as to be able to rotate together with the turntable, and communicates with a socket joint 15 that extends to the outer periphery of the upper surface of the turntable 1. A donut ring-shaped upper suction chamber 10 having an exhaust gas intake port 17, and an exhaust gas duct that is rotatably sealed and loosely fitted into the suction chamber 10 and extends outside the turntable device. A turntable comprising a donut ring-shaped lower suction chamber 11 having an exhaust gas outlet communicating with the rotary shaft 3, and a power cord and a communication cable being inserted through a hollow part of the rotating shaft 3. Gas exhaust system.