JPH11258104A - Wind generating device for wind tunnel - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a wind generating device for a wind tunnel wherein occurrence of abnormality is automatically detected for safe stop. SOLUTION: A high-pressure air 10 at normal temperature filled in a high- temperature air-storage tank 1 is depressurized to a specified value by a pressure-regulating valve 2, and then heated to a specified temperature by a heater 3 to obtain a high-temperature high-pressure air 10', which is introduced from a high-temperature shielding valve 5 to a nozzle 6, for generating an air current in a wind tunnel. The normal-temperature high-pressure air 10 is applied to a slide part of a valve rod plug part of the high-temperature shielding valve 5 as a seal air. A pressure transfer device 7 detects a pressure of the normal-temperature high-pressure air 10 flowing in a supply piping. A pressure transfer device 8 detects a seal air pressure. A wind tunnel control device 4 receives a pressure value from the pressure transfer channels 7 and 8, and, based on calculation, controls closing operation of the pressure regulating valve 2 and the high-temperature shielding valve 5.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a wind tunnel device using a high-temperature gas, for example, a wind tunnel wind generator having a function of detecting a decrease in seal air pressure for a shutoff valve in a supersonic wind tunnel.

[0002]

2. Description of the Related Art FIG. 3 is a circuit diagram of a wind tunnel wind generator according to the prior art. The high-pressure air filled in the high-pressure storage tank 11 is supplied to the pressure regulating valve 12, the pressure transmitter 17, and the wind tunnel controller 1
While being regulated by 4, it is introduced into the heater 13 and becomes high-temperature and high-pressure air. The high-temperature, high-pressure air passes through a high-temperature shutoff valve 15 controlled by a wind tunnel
6 to generate an airflow.

[0003]

Here, the high-temperature shut-off valve 1
5, normal temperature high-pressure air is applied to the pressure-regulating valve 12 to the sliding portion of the valve stem plug so that high-temperature and high-pressure air is not released into the atmosphere in the event of an abnormality such as breakage of the sealing material of the sliding portion. It is applied as a seal air from the downstream side. In spite of such measures, if any of the above-described abnormalities occur, it is necessary to completely close the pressure regulating valve 12 and the high-temperature cutoff valve 15 to stop the wind tunnel. However, the circuit shown in the figure cannot automatically detect such an abnormality, and is not sufficient in terms of safely stopping the wind tunnel. The present invention has been made in view of the above circumstances, and has as its object to provide a wind tunnel wind generator capable of automatically detecting when an abnormality has occurred and stopping safely.

[0004]

SUMMARY OF THE INVENTION The present invention has been made in order to solve the above-mentioned problems, and is provided between a first pressure detector of a supply pipe and a flow path of a high-temperature and high-pressure gas (for example, a shutoff valve). Sealing air applied to avoid release of
In a device including a nozzle disposed at a flow path end, a control for determining a seal abnormality from a second pressure detector of the seal air and an output result of the second pressure detector and the first pressure detector Unit. That is, the pressure of the seal air is detected, and the predetermined calculation and the determination of the seal abnormality are performed by a control unit (for example, a wind tunnel control device). When it is determined that the seal is abnormal, the supply of the high-temperature and high-pressure gas is stopped. Here, the predetermined calculation is for calculating an element used for determining a seal abnormality, and for example, a differential pressure between a detected value of a pressure detector and a pressure value of a supply pipe, a change speed of the differential pressure, and the like. Is calculated. Note that the change speed may take the sampling time into consideration. Also, the judgment of the seal abnormality is
The determination is made based on whether or not the above element exceeds a predetermined range. When a plurality of elements are used, if OR (logical sum) is set, it is possible to determine the seal abnormality from multiple aspects. In some cases, it is effective to use AND (logical product) depending on the element used. In such a case, AND is used as appropriate.

[0005]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Next, an embodiment of a wind tunnel wind generator according to the present invention will be described with reference to the drawings. FIG. 1 shows a circuit diagram of a wind generator of a wind tunnel (supersonic wind tunnel) according to an embodiment of the present invention. Note that broken lines A to D in the figure are
This is a signal transport path. As shown in FIG.
Pressure regulating valve 2, heater 3, wind tunnel control device 4, high temperature shutoff valve 5,
A nozzle 6 and pressure transmitters 7 and 8 are provided. The high-pressure storage tank 1 is filled with high-pressure air 10 at room temperature. After the high-pressure air 10 is depressurized to a predetermined value by the pressure regulating valve 2, the high-pressure air 10 is heated to a predetermined temperature by the heater 3, and
Becomes Then, the air is guided to the nozzle 6 through the high-temperature cutoff valve 5 and generates an airflow in a wind tunnel (not shown).

The opening and closing of the pressure regulating valve 2 and the high-temperature cutoff valve 5 are controlled by a wind tunnel control device 4, and are electrically turned on.
-OFF control is performed (see broken line A and broken line B in FIG. 1). The valves 2 and 5 may be controlled independently or may be controlled in conjunction.
Even if an abnormality such as breakage of the sealing material of the sliding portion occurs, a branch point 9 is provided at an intermediate portion between the pressure regulating valve 2 and the heater 3 so that the high temperature and high pressure air 10 'is not released into the atmosphere from the high temperature shutoff valve 5. And high-pressure air 10 at room temperature is applied as seal air to the sliding portion of the valve stem plug. Pressure transmitter 7,
Reference numeral 8 denotes an instrument that detects the magnitude of the pressure, converts the pressure into a uniform signal, and transmits the signal (electronic type), and outputs the current to the wind tunnel control device 4 (see broken lines C and D in FIG. 1). The pressure transmitter 7
Between the pressure regulating valve 2 and the branch point 9, the pressure of the normal-temperature high-pressure air 10 flowing through the supply pipe is detected. The pressure transmitter 8 is a high-temperature air 10 at normal temperature that branches from the branch point 9 to the high-temperature shutoff valve 5.
To detect the pressure. The wind tunnel control device 4 performs the following arithmetic processing on the basis of the signals from the pressure transmitters 7 and 8, and based on the result, determines whether the high-temperature shutoff valve 5 and the pressure regulating valve 2
Perform ON-OFF control. In addition, it is preferable to use a high-temperature shut-off valve 5 that has a faster valve closing operation.

In a normal state, the pressures detected by the pressure transmitters 7 and 8 are the same. However, when an abnormality such as breakage occurs in the sealing material, the high-temperature shut-off valve 5 is provided with seal air (normal-temperature high-pressure air). Since 10) is leaked into the atmosphere, the seal air pressure is lower than the pressure on the original side. That is, the output value PX2 of the pressure detector 8 is compared with the output value PX1 of the pressure detector 7, and if this differential pressure ΔPX exceeds the allowable pressure deviation value, it is determined that there is an abnormality. Further, when a precursor of abnormality such as minute damage of the sealing material occurs during ventilation, the change speed vpx of the differential pressure ΔPX is detected in order to detect the precursor.
Is calculated, and if this value vpx exceeds the allowable differential pressure change speed value vps, it is determined that there is an abnormality.

Now, assuming that the output value of the pressure detector 8 at a certain time point n is PX2n, the output value of the pressure detector 7 is PX1n, and the allowable pressure deviation value is Ps, the differential pressure ΔPXn is ΔPXn = (PX1n− PX2n) (Equation 1) When ΔPXn> Ps (Equation 2), it is determined to be abnormal. Further, the differential pressure when sampling at a certain time point n is ΔPXn, and the differential pressure when sampling at the immediately preceding time point n−1 is ΔPXn−
Assuming that the sampling time is Δt, the change speed vpx is as follows: vpx = (ΔPXn−1−ΔPXn) / Δt (Equation 3), and when vpx> vps (Equation 4), Abnormal. The values of the allowable pressure deviation value Ps and the allowable differential pressure change speed value vps are appropriately determined based on the pressure value of the high-pressure air and other conditions.

As shown in FIG. 2, when one of the conditions shown in the above equations (2) and (4) is satisfied, the wind tunnel control device 4 determines that a seal abnormality has been detected, and the high temperature shutoff valve 5 and the pressure regulating valve 2 Is automatically closed completely, and the wind tunnel is stopped immediately. The calculations of the above equations 2, 4 and OR (logical sum) are performed inside the wind tunnel control device 4. The design of the circuit is within the ordinary skill of the artisan. In the above equation 2, the differential pressure Δ
PXn In the above equation 4, the change speed vpx is determined and OR (logical sum) is used, so that not only a gradual decrease in the seal air pressure but also a rapid decrease can be quickly dealt with. Safety can be improved.

It is also possible to control so that the operation of the heater 3 is stopped when the wind tunnel stops abnormally.
Further, the control of the heater 3 may be performed by the wind tunnel control device 4. Also, after processing the details of the abnormality,
For example, a reset operation is performed on the wind tunnel control device 4, and the wind tunnel can be restarted.

[0011]

According to the present invention, since the seal air pressure is also detected to determine the seal abnormality, the seal abnormality can be automatically detected and the wind tunnel can be safely stopped when the seal is abnormal. be able to.

[Brief description of the drawings]

FIG. 1 is a circuit diagram of a wind generator in a wind tunnel according to an embodiment of the present invention.

FIG. 2 is a block diagram when an abnormality is determined in the wind tunnel control device of FIG. 1;

FIG. 3 is a circuit diagram of a wind generator in a wind tunnel according to the related art.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 High pressure air storage tank 2 Pressure regulating valve 3 Heater 4 Wind tunnel control device 5 High temperature cutoff valve 6 Nozzle 7, 8 Pressure transmitter 9 Branch point 10 Room temperature high pressure air 10 'High temperature high pressure air

Claims (1)

[Claims] 1. A device for applying a seal air in order to avoid release of a high-temperature and high-pressure gas from a shut-off valve and ejecting the high-temperature and high-pressure gas from a nozzle at a flow path end, comprising: a pressure detector for the seal air; A wind generator in a wind tunnel, wherein a seal abnormality is determined by comparing a detected value of a detector with a pressure value of a supply pipe.