JP2005083910A - Jig for checking leakage - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a leakage checking jig which is easy to assemble, easy to measure, monitors leakage of gas in real time, and is not affected by a temperature change. <P>SOLUTION: The leakage checking jig 2 comprises a cover part 3 to be attached to the object to be leakage checked, and a leakage gas collection part 4 for collecting the gas leaked from the cover part 3. The leakage gas collection part 4 is formed by a flexible material. In the cover part 3, the chamber 9 is provided in which the conductor body 13 is provided, and the body 13 is provided at the tip of the part 4, and the electrical contact 15 is exposed in the chamber 9 and connected with the luminous body 10, the conductor body 13 and the electrical contact 15 are connected with the electric source 11 via the conductors 14 and 16. When the leakage gas is collected into the leakage gas collection part 4 via the cover part 3, the leakage gas collection part 4 expands, the conductor body 13 and the electrical contact 15 are abutted against each other, thereby the luminous body 10 illuminates, and means detection of the leakage is further facilitated. <P>COPYRIGHT: (C)2005,JPO&NCIPI

Description

  The present invention relates to a leakage inspection jig, and more particularly to a leakage inspection jig used in a propulsion system device for a space vehicle such as an artificial satellite.

  In a conventional propulsion system test for an artificial satellite or the like, as shown in FIG. 6, a test apparatus comprising a thruster nozzle 1 of an artificial satellite 12, a nozzle cover portion 3, a hose portion 7, and a leakage test device 8. Are connected, and it is confirmed whether or not gas is leaking when the propellant valve located upstream of the thruster nozzle 1 of the artificial satellite 12 is in a closed state. When the gas is leaking, the leaked gas pushes the air inside the hose part 7 etc., moves the vacuole housed in the narrow tube inside the leak test device 8, and the elapsed time and the vacuole The amount of leakage is calculated based on the amount of movement. This leak test is conducted about once or twice a year from the manufacture of the satellite propulsion system to its launch.

  However, in the above-mentioned conventional technology, first, since many special test devices are used for the satellite propulsion system test, the propulsion system test of an artificial satellite with strict cleanliness is required unless it is a specialized engineer. It was difficult to implement without problems. In addition, the leakage test apparatus 8 is particularly difficult to handle and is easily affected by air, temperature, air conditioning, etc., so that it is difficult to assemble and measure the apparatus unless it is a professional engineer handling the leak test apparatus 8. There was a problem that there was.

Second, the above-mentioned satellite propulsion system test requires a specialist from the propulsion system to receive assistance, so it is a large-scale test, and the number of tests is limited due to the schedule relationship with the satellite system. Yes, it takes about once or twice a year from the satellite propulsion system to the launch. Accordingly, there is a problem that monitoring cannot be performed in real time and the discovery of an abnormality may be extremely delayed. In addition, since the leakage time cannot be limited, it has been difficult to investigate the cause.

  Third, when the above test cannot be performed, an electric test device is connected to the satellite, and the pressure detector is used to monitor the value obtained by converting the pressure in the propulsion system into an electric signal. There is a method for determining the presence or absence of leakage, but it has been difficult to determine whether the cause of the pressure drop is due to gas leakage or an error in the test apparatus due to temperature changes.

  Therefore, the present invention has been made in view of the above-described problems in the prior art, and is easy to assemble and measure the apparatus, can monitor gas leakage in real time, and is affected by temperature changes. An object is to provide a leak inspection jig that does not occur.

  In order to achieve the above object, the present invention is a leakage inspection jig, comprising: a cover portion attached to a leakage inspection object; and a leakage gas collection portion that collects and collects gas leaked from the cover portion. It is characterized by providing.

  According to the present invention, when the gas is collected and collected in the leaked gas collection unit, it can be determined that the gas is leaking from the leak inspection object, so that the leak can be confirmed in real time. It is possible to detect an abnormal time at an early stage, quickly protect the product, repair it, suppress the spread to others, and improve the reliability and safety of the device. Further, since the leakage gas can be directly collected to determine the leakage, the leakage can be reliably determined as compared with the pressure drop method using the pressure detector that indirectly determines the leakage.

  In addition, since the leak inspection jig according to the present invention is composed of a cover part and a leak gas collecting part, it is easy to handle, and the leak test apparatus can be reduced in size, productivity, and maintainability. it can. Since the judgment of leakage is obvious, it is not necessary to be a specialized engineer, and the efficiency of the test and the cost reduction can be achieved.

  The leak gas collection part of the leak check jig can be formed of a stretchable material. Moreover, it can also be set as a structure which a leaked gas collection part expand | swells, when gas flows in into a leaked gas collection part, without using an elastic material.

  Furthermore, the present invention provides a housing mounted on a cover portion in the leakage inspection jig, a conductor mounted on a tip of the leaked gas collection unit in the housing, and an electric power exposed in the housing. A contact portion; a light emitter connected to the electrical contact portion; and a power source connected to the conductor and the electrical contact portion via a conducting wire, and gas is supplied to the leaked gas collection portion via the cover portion. When the gas is collected, the leaked gas collecting part expands, the conductor and the electrical contact part come into contact with each other, and the light emitter can emit light. Thus, when there is a gas leak, the light emitter emits light, so that the leak can be easily found.

  The leak inspection object can be a thruster nozzle of an artificial satellite. As a result, leak tests that could previously only be performed once or twice a year can be performed in real time, limiting the timing of abnormal occurrence (improving the accuracy of investigating the cause of defects), and early processing of abnormal occurrence (product damage) (Expansion prevention, ripple control to other devices) becomes possible. Conventionally, it was impossible to monitor leakage during a mechanical environment test such as a vibration test, but by installing the leakage inspection jig of the present invention on a thruster nozzle, even during the main test where leakage is likely to occur. Monitoring becomes possible. Furthermore, the determination of leakage is not affected by temperature conversion.

  As described above, according to the present invention, the leakage inspection / treatment having advantages such as easy assembly and measurement of the apparatus, monitoring of gas leakage in real time, and no influence of temperature change. Tools can be provided.

  1 and 2 show an embodiment of a leakage inspection jig according to the present invention, and this leakage inspection jig is used for testing gas leakage in a satellite propulsion system test, for example. The thruster nozzle 1 of the artificial satellite is a portion that discharges thrust for controlling the attitude of the artificial satellite, and controls injection / stop with a propellant valve located on the upstream side. In the test on the ground, gas is sealed in the artificial-satellite propulsion system tank and piping, and it is confirmed through the thruster nozzle 1 whether there is gas leakage with the propellant valve closed.

  The leakage inspection jig 2 includes a nozzle cover portion 3 and a leakage gas collection portion 4. The nozzle cover portion 3 is attached to the thruster nozzle 1 and has a shape and elasticity that can seal the release portion of the thruster nozzle 1. A hole 3a is formed in a substantially central portion of the nozzle cover portion 3, and a leakage gas collecting portion 4 is connected so as to wrap around the hole 3a. The leaking gas collection unit 4 can be configured to expand when gas is sealed, or can be configured of a stretchable material or the like.

  An artificial satellite test operator attaches leakage inspection jigs 2 to all thruster nozzles 1 of the artificial satellite. When the leakage inspection jig 2 is attached, the leakage gas collection unit 4 is degassed (air collection such as squeezing or rounding the collection unit). Thereby, the leaking gas collection part 4 is attached in the atrophied state.

  If gas leaks from a propellant valve or the like of an artificial satellite, the leaked gas accumulates in the thruster nozzle 1 and passes through the hole 3a of the nozzle cover part 3 and is sealed in the leaked gas collection part 4. Thereby, as shown in FIG. 3, the leaked gas collection part 4 swells, and it can confirm the leak of gas.

  As another embodiment of the present invention, the leakage inspection jig shown in FIG. 4 is for inspecting the leakage of gas from the joint portion of the pipe 5 and the nozzle shown in FIGS. Instead of the cover part 3, a pipe cover part 6 is provided. Then, the leaked gas collecting unit 4 collects and collects the leaked gas from the pipe cover unit 6. Accordingly, it is possible to monitor leakage from the gas pipe.

  As another embodiment of the present invention, as shown in FIG. 5, a small box portion 9 is provided in the nozzle cover portion 3 and a light emitter 10 is connected thereto. A small leak gas collection unit 4 is provided in the small box unit 9, and a conductor 13 and a conductive wire 14 are attached to the tip. In addition, the electrical contact portion 15 of the light emitter 10 is exposed in the small box portion 9 and connected to a small battery 11 provided outside the small box portion 9 by a conducting wire 16. As a result, when a gas leak occurs, the small leaked gas collection unit 4 expands, the conductor 13 at the tip comes into contact with the electrical contact part 15 of the light emitter 10, the light emitter 10 emits light, and leakage occurs. You can be informed.

  In the above configuration, the nozzle cover portion 3 may have a drop-preventing band that can withstand vibration tests and acoustic tests.

It is sectional drawing which shows one Embodiment of the leak inspection jig concerning this invention. It is an external view of the leakage inspection jig of FIG. It is sectional drawing which shows the state at the time of the gas leak of the leak inspection jig | tool of FIG. It is a front view which shows another embodiment of the leakage inspection jig concerning this invention. It is sectional drawing which shows another embodiment of the leak inspection jig concerning this invention. It is the schematic which shows an example of the conventional artificial satellite propulsion system leak test apparatus.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Thruster nozzle 2 Leakage inspection jig 3 Nozzle cover part 4 Leakage gas collection part 5 Piping 6 Piping cover part 7 Hose part 8 Leakage test device 9 Small box part 10 Light emitter 11 Small battery 12 Artificial satellite 13 Conductor 14 Conductor 15 Electricity Contact 16 Conductor

Claims (4)

A cover part to be attached to a leakage inspection object;
A leakage inspection jig, comprising: a leakage gas collecting portion that collects and collects gas leaked from the cover portion.   The leak inspection jig according to claim 1, wherein the leak gas collecting unit is formed of a stretchable material. A housing attached to the cover part;
In the housing, a conductor attached to the tip of the leaked gas collection unit;
An electrical contact exposed in the housing;
A light emitter connected to the electrical contact portion;
A power source connected to the conductor and the electrical contact portion via a conductor;
When gas is collected in the leaked gas collecting part through the cover part, the leaked gas collecting part expands, the conductor and the electrical contact part come into contact with each other, and the light emitter emits light. The leakage inspection jig according to claim 1 or 2, wherein   4. The leakage inspection jig according to claim 1, wherein the leakage inspection object is a thruster nozzle of an artificial satellite.

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