DE2925624C2 - - Google Patents

Description

The invention relates to a safety grate, consisting of preferably arranged in parallel filled with gas or air Pipes with electrically conductive inner walls, in which a conductive element isolated from the inner wall of the tube is in the form of a wire or ribbon, which by a Spring is held in a tensioned state, a power supply and in the event of deformation, damage or destruction of the tube triggers an electrical signal.

It is common in the inlet channel through which the cooling water flows to a power plant is supplied to arrange a rake which has the task hold back coarse contaminants and the downstream ones to protect sensitive mechanical cleaning devices. This rake can either be cleaned by hand or machine will. If you choose the gap width of this rake small enough you can also prevent him from fighting swimmers or Terrorists enter the power plant below the water level. This measure is particularly extraordinary in the case of nuclear power plants Importance. However, with the usual rake it is only possible withhold the named persons if they do not have any special Carry tools or means of destruction with you.  

The rake bars are designed as hollow bars and are made of gas or air filled. There is a leading from each rod Rod itself insulated element in the form of a wire or ribbon, which is held under tension by a spring and in the event of deformation, damage or destruction of the pipe triggers an electrical signal. By isolating the conductive Material from the rake, an open circuit is formed, which does not carry any current in the normal state. Only when somehow a conductive connection to this material and the rod consists of a current that flows for an acoustic or optical signal can be used.

In a device known from DE-AS 10 03 636 for generating a permanent alarm Burglar, theft and fire alarm devices, on which the preamble of claim 1 is based, are the elements of the individual pipes over a common wire summarized and will be excited together.

Due to inevitable inaccuracies in material and in manufacturing and the temperature can affect the wires differently be taut, and in extreme cases false alarms can be triggered will. Also you can not locate the staff in which an alarm occurs.  

This is especially the case with rakes that work for large amounts of water are designed and cover a large area, important. At Malfunctions or false alarms are then only required for the respective one Repairing staff.

The object of the invention is to develop a rake with the separate connection of each one Rod can be precisely determined with the evaluation electronics can determine from which staff the alarm is given.

This object is achieved by the features characterized in claim 1.

In one embodiment of the invention is part of the wire replaced by a preferably elliptical loop, which at Tear the wire into a preferably circular shape and this creates the connection between the rod and the current conductor. This design is intended to ensure that even then, if the wire breaks for any reason and therefore one secure monitoring is no longer guaranteed, signal given and then you intervene and the system is working again can bring.  

In a further advantageous embodiment, the wire given a pre-tension by twisting, which when the Wire becomes free and, due to the sudden twisting, hurls around of the wire and thus touching the rod, the current return is carried out by a special cable. Because with this twisting the wire breaks at any A current return line is required. It could e.g. B. tear the wire in the upper part and that lower part the effect of the connection created by the drilling with the rod wall. Because the current feedback through the upper part takes place, a message would then no longer be guaranteed. The return line described is therefore necessary.

In a last embodiment the wire is at the same time as Heating wire trained. If there is a computer in an area is installed in the winter with very low temperatures It may be necessary to prevent ice formation prevent heating the rods. Such heating leaves combine very advantageously with the described device, the wire being designed as a heating wire or as a heating tape ought to.

The various embodiments are shown in the drawings explained in more detail.

Fig. 1 shows schematically an inlet channel ( 13 ) in which a rake ( 16 ) is installed. The upper edge of the rake is preferably below the water level ( 14 ). The direction of flow ( 17 ) is indicated.

Fig. 2 shows an embodiment of the grate. The rake bars ( 1 ) are designed as hollow profiles. The conductive material, designed as wire ( 2 ) in the example, is insulated from the actual rack by insulating pieces ( 6 ), so that normally no current flows. While one pole ( 15 ) is connected to the rack, the other pole is connected to the wire ( 2 ). An evaluation electronics ( 5 ) gives an acoustic ( 3 ) or optical ( 4 ) signaling.

Fig. 3 shows a preferably elliptical ring ( 10 ), which is elastic and thereby tends to deform into a circle. If the wire breaks, this deformation occurs and the circular ring touches the wall of the rod and thus represents the conductive connection via the current lead ( 11 ).

Fig. 4 finally shows the prestressed wire ( 2 ' ), which creates a connection with the rod when torn by its untwisting. If the rod tears just below the upper fastening, the lower end is drilled open and a connection is made between it and the rod wall. There would then no longer be a connection to the current discharge line ( 11 ). To ensure this, a connecting line ( 12 ) is led to the lower end of the wire.

Claims (4)

1. Safety rack, consisting preferably of parallel arranged, filled with gas or air tubes with electrically conductive inner walls, in which there is a conductive element insulated from the inner wall of the tube in the form of a wire or band, which is held in a tensioned state by a spring has a power supply and triggers an electrical signal when the pipe is deformed, damaged or destroyed, characterized in that
that in the case of a safety rack against the entry of combat swimmers or terrorists into the inlet or outlet channel of a power plant, in particular a nuclear power plant, each tube ( 1 ) has its own element ( 2 ) which is separated from the elements ( 2 ) of the other tubes ( 1 ) is electrically isolated,
that each element ( 2 ) in the respective tube ( 1 ) is individually held in a tensioned state by a respective spring ( 7, 10 ) and is individually connected to the evaluation electronics ( 5 ). 2. Safety rack according to claim 1, characterized in that part of the wire ( 2 ) or the band is replaced as a spring on the end facing the power supply by an elastic ring ( 10 ) which has an approximately elliptical shape in the tensioned state and which Does not touch the inner walls of the tube ( 1 ), but when the wire ( 2 ) or the tape breaks, it changes into an approximately circular shape and thereby creates the connection between the tube ( 1 ) and the power supply ( 11 ). 3. Safety bar rack according to claim 1, characterized in that the wire 'is given by twisting a bias voltage at break of the wire (2 (2)' is released), whereby by the sudden untwisting a Around skidding of the wire (2 ') and so that touching the tube ( 1 ) is caused, and that an additional conductor ( 12 ) is connected within the tube ( 1 ) at the suspension points of the wire ( 2 ' ), which is thereby electrically parallel to the wire ( 2' ). 4. Safety rack according to one of claims 1 or 2, characterized in that the wire ( 2 ' ) is simultaneously designed as a heating wire.