JPS59120838A - Water-leakage simulator - Google Patents

Abstract

PURPOSE:To enable the theoretical evaluation test of a correlation type water- leakage detector, by respectively outputting water-leakage simulation signals to simulation pipelines from both speaker circuits directly and in a delayed state. CONSTITUTION:A water-leakage simulation signal generator 1 simulatively generates a water-leakage sound in a water supply arranged pipe network of water service and speaker circuits 7, 11 are connected to the generator 1. The circuit 11 is constituted of delay circuits 1-N each delaying the signal of the generator 1 to set this delay amount as a water-leakage position, a switch circuit 9 for changing over the delay amounts of the circuits 1-N and speaker apparatus 11 connected to the circuit 9. On the other hand, the circuit 7 comprises a speaker apparatus 7 for directly issuing the signal of the generator 1 as an output sound and the output sounds of the device 7, 11 are respectively transmitted to simulation pipelines 8, 12 as vibrations which are, in turn, used as the input signals of a water-leakage detector 22. As a result, the theoretical evaluation test of a correlation type water-leakage detector can be performed.

Description

[Detailed Description of the Invention] The present invention is a water leakage simulator for performing functional tests, calibration, self-checking, and other evaluation tests on a desk of a so-called correlation type water leakage detector for discovering the location of water leakage in a water supply and distribution pipe network, etc. It is related to the device.

In the past, when testing whether a correlation-type water leak detector actually satisfies its functions, the only way was to cause a leak in an actual water pipe and perform a test measurement. In other words, evaluation tests of correlating water leak detectors could only be conducted when actual water leaks occurred on site.

In view of the above-mentioned circumstances, it is an object of the present invention to provide a water leakage simulator device that allows evaluation tests to be easily performed even on a desk.The configuration thereof will be explained as follows.
It is equipped with a water leakage pseudo signal generator that simulates the sound of water leakage in a water supply and distribution pipe network, etc., and two speaker circuits connected to this generator.One speaker circuit generates the water leakage pseudo signal. One or more delay circuits that cause a delay and set this delay amount as the water leak position (as a special case, the delay is 0, which corresponds to the case where the water leak position is in the center), and the delay amount of this delay circuit (water leak position). A switch circuit for switching,
A speaker device is connected to this switch circuit, and the other speaker circuit is a speaker device that outputs the water leakage pseudo signal as it is as sound without delaying it. The front surfaces of both speaker devices are provided with mechanically vibrationally separated pseudo conduits, so that the output sound from each of the speaker devices is transmitted as vibrations to each of the pseudo conduits. The vibrations transmitted to both pseudo pipes are used as input signals to the water leak detector.

An embodiment of the apparatus of the present invention will be described below with reference to the drawings. First, the principle of the water leakage detector will be explained with reference to FIG. 1. In the figure, 21 is a water pipe, 22 is a water leak detector, 23,
24 is a charge amplifier connected to the water leakage detector 22, 25
, 26 are acceleration pickups connected to the charge amplifiers 23 and 24.

P is the water leak position of the water pipe 21, and acceleration pickups 25 and 26 are installed at two points A and B on the pipe that sandwich this water leak position P.
is set to capture the water leak sound, and the propagation time difference of the water leak sound reaching both points A and B is measured by the cross-correlation method, and from this, the distance L between the two points, and the propagation speed C of the water leak sound in the pipe. ,
This principle is used to calculate the distance to the water leakage position P.

Here, the distance lA from the water leakage position P to the point A of one of the acceleration pickups 25 is expressed by the following equation.

lA=1/2 (L-Tm×C) Tm: Propagation time difference Furthermore, lB is the distance from the water leakage position P to the other acceleration pickup 2
6 This is the distance to point B.

Next, the water leakage simulator device according to the present invention will be described. Its basic configuration is as shown in FIG. 2. That is, in FIG. 2, reference numeral 1 denotes a water leakage pseudo signal generator, which generates a pseudo signal having a large amount of water leakage sound components. 2, 3, 4, and 5 are delay circuits, N of which are connected in series, and each delay circuit is provided with an output terminal. Now, when a water leakage pseudo signal is output from the water leakage pseudo signal generator 1, this signal is divided into two systems, one of which reaches the speaker 7 via the low-pass filter 6, and the output sound of the speaker 7 causes the pseudo pipe line 8. is vibrated and passes through delay circuit 1-2, delay circuit 2-3, delay circuit 3-4, etc. in order on one side, and the output of each is selected by the water leakage position selector switch 9 and is low-pass. The signal is input to the filter 10, passes through the speaker 11, and causes the pseudo conduit 12 to vibrate. Here, both the pseudo conduits 8 and 12, which are provided mechanically and vibrationally separated from each other, are connected to the delay circuits 2, 3, . . .
・It vibrates with a delay amount determined by 5, that is, a time difference.

This time difference corresponds to the actual propagation time difference of water leak sound. Therefore, at this time, the acceleration pickups 25 and 26 are set in the pseudo pipes 8 and 12, and both detection signals are passed through the charge amplifiers 23 and 24 to the leakage detector 22.
If inputted, the position corresponding to the amount of delay becomes the water leak position and is displayed on the water leak detector 22. Further, this delay amount, that is, the water leakage position, can be arbitrarily changed by operating the switch 9.

In addition, a water leak position display selection circuit 13 is connected to the water leak position changeover switch 9 circuit, and the outputs corresponding to the delay circuits 2, 3, 4, and 5 of this circuit 13 are set as the water leak positions, and the pseudo pipes 8, 12 are set. Water leakage position display 14 installed between
It can be displayed above. This enables faster and more reliable evaluation tests of water leak detectors.

As described in detail above, according to the present invention, a correlation type water leak detector can be easily evaluated and tested on a desk. Therefore, the device of the present invention has the advantage that it can be effectively used as a maintenance and service device for correlating type water leak detectors, or as an educational device for understanding correlating type water leak detectors.

[Brief explanation of drawings]

FIG. 1 is a diagram showing the measurement principle of a water leak detector, and FIG. 2 is a block diagram showing the basic configuration of a water leak simulator device according to the present invention. DESCRIPTION OF SYMBOLS 1... Water leak pseudo signal generator, 2, 3, 4, 5... Delay circuit, 6, 10... Low pass filter, 7, 11...
...Speaker, 8, 12...Pseudo pipe line, 9...Water leak position switch, 21...Water pipe, 22...Water leak detector, 23, 24...Charge amplifier, 25, 26
...Acceleration pickup. Patent applicant Japan Radio Co., Ltd.

Claims (1)

[Claims] It is equipped with a water leakage pseudo signal generator that simulates the sound of water leakage in a water supply and distribution pipe network, etc., and two speaker circuits connected to this generator, one of the speaker circuits delaying the water leakage pseudo signal. It consists of one or more delay circuits that set the delay amount of the lever as the water leak position, a switch circuit that switches the delay amount (water leak position) of this delay circuit, and a speaker device connected to this switch circuit. Consisting of a speaker device that outputs sound without delaying the water leakage pseudo signal, both of these speaker devices are provided with mechanically vibrationally separated pseudo pipes, and the output sound from each speaker device is routed through the respective pseudo pipes. A water leak simulator device that transmits vibrations to the road and uses the vibrations as an input signal to a water leak detector.