JP4817017B2 - Airtight test method and apparatus for high pressure tank - Google Patents

Description

  The present invention relates to an airtight test method for a high-pressure tank and an airtight test apparatus. More specifically, the present invention relates to an improved technique for testing the tightness of high pressure tanks.

When carrying out an airtight test of a high-pressure tank (for example, a high-pressure hydrogen tank filled with hydrogen gas supplied to a fuel cell), the internal pressure is increased to a working pressure (for example, 70 MPa) by filling He gas ( For example, see Patent Document 1). However, when the tank is filled with He gas or the like, the high pressure tank becomes a high temperature, for example, around 100 ° C. due to the influence of adiabatic compression. It is.
JP 56-138597 A

  However, for example, the above-described high-pressure hydrogen tank is often composed of a resin liner or CFRP, and has a structure in which the amount of heat radiation is small and is difficult to cool down. For example, the current situation requires about one hour, and there is a demand for shortening the cooling time and thus the process time of the hermetic test. On the other hand, the working pressure of the high-pressure hydrogen tank tends to increase year by year in order to extend the cruising range of the fuel cell vehicle. However, the higher the working pressure, the larger the temperature rise, and in addition, the CFRP plate thickness increases. There is also a situation that the amount of heat radiation is further reduced, and there is also an aspect that shortening of the cooling time is severe.

  Accordingly, an object of the present invention is to provide an airtight test method and an airtight test apparatus for a high-pressure tank capable of shortening the tank cooling time and thus shortening the test process time.

  As described above, at the start of the hermetic test, the current situation is that the high-pressure tank that has become hot is waiting to cool. As a result of further studies from such a viewpoint, the present inventor who has focused on suppressing the temperature increase of the high-pressure tank has obtained new knowledge that leads to the solution of such problems.

  The present invention is based on such knowledge. In the method for testing the airtightness of a high-pressure tank, a plurality of high-pressure tanks for test are prepared, and the test is completed among the plurality of high-pressure tanks for test. The high pressure gas is sent to the test standby high pressure tank to be tested after that point in time, and after the test is completed and the pressure of the test standby high pressure tank is balanced, the gas is accumulated from the gas accumulator to the test standby high pressure tank until a predetermined pressure is reached. And an airtight test is performed on the test standby high-pressure tank to which the gas is supplied.

  When the exhaust gas from the high-pressure tank at the end of the test is exhausted from the high-pressure tank, the temperature is lowered due to adiabatic expansion. In this airtight test method, the gas whose temperature has been lowered is sent to the test standby high-pressure tank, so that the temperature increase of the test standby high-pressure tank can be suppressed. According to this, it is possible to suppress the temperature rise of the high-pressure tank (test standby high-pressure tank) without supplying cold from outside, and the cooling time until the high-pressure tank reaches room temperature can be shortened. Therefore, the process time required for the airtight test can be shortened.

  In the present invention, the remaining gas in the high-pressure tank at the end of the test is recovered by a recovery device, and the high-pressure tank at the end of the test is replaced with a high-pressure tank for test that is the next test target. In such a case, the high-pressure tank for the test after the replacement becomes the next high-pressure tank for the test standby, and the exhaust gas from the high-pressure tank for which the test has been completed (the previous high-pressure tank for the test) is sent to the next high-pressure tank for the next test standby. Can do. According to such a test method, by repeating the procedure of sequentially replacing the high-pressure tank one by one, it is possible to shorten the process time and perform the airtight test more efficiently.

  Further, the present invention provides a method for testing the hermeticity of a high-pressure tank. A plurality of high-pressure tanks for testing are prepared, and the plurality of high-pressure tanks for testing are discharged from the high-pressure tank for which testing has been completed. Heat exchange is performed between the gas and the pressurized gas supplied from the gas accumulator to the test standby high-pressure tank to be tested after that time, and the test standby high-pressure tank to which the gas is supplied until a predetermined pressure is reached. It is characterized by conducting an airtight test.

  In this case, the exhaust gas from the test high-pressure tank is not sent to the test standby high-pressure tank but is used for heat exchange with the pressurized gas supplied to the test standby high-pressure tank. As described above, the temperature of the gas discharged from the high-pressure tank at the end of the test has decreased due to adiabatic expansion at the time of discharge, so the heat of the pressurized gas is absorbed during heat exchange, and the temperature of the high-pressure tank waiting for the test is increased. suppress. According to this, it is possible to suppress the temperature rise of the high-pressure tank (test standby high-pressure tank) without supplying cold from outside, and the cooling time until the high-pressure tank reaches room temperature can be shortened.

  The present invention also relates to an apparatus for testing the airtightness of a high-pressure tank, a first test batch in which a high-pressure tank for test is installed, and a second test batch in which another high-pressure tank for test is installed. , A high-pressure tank connection pipe for connecting the test high-pressure tank of the first test batch and the test high-pressure tank of the second test batch, a valve installed in the connection pipe, the first test batch or A gas pressure accumulator that supplies gas to the test standby high-pressure tank of the second test batch until a predetermined pressure is reached.

  The exhaust gas from the test-finished high-pressure tank in one test batch undergoes adiabatic expansion when the gas is discharged from the high-pressure tank, and the temperature decreases. In this airtight test apparatus, the temperature drop of the test standby high-pressure tank is suppressed by sending the gas thus lowered in temperature to the test standby high-pressure tank in the other test batch via the high-pressure tank connection pipe. I have to. According to this, it is possible to suppress the temperature rise of the high-pressure tank (test standby high-pressure tank) without supplying cold from outside, and the cooling time until the high-pressure tank reaches room temperature can be shortened.

  Furthermore, the present invention provides an apparatus for testing the airtightness of a high-pressure tank, a first test batch in which a high-pressure tank for test is installed, and a second test batch in which another high-pressure tank for test is installed. A gas pressure accumulator for supplying gas to the test standby high-pressure tank of the first test batch or the second test batch until a predetermined pressure is reached, and supply of the gas pressure accumulator and the first test batch or the second test batch A gas supply pipe connecting the trial high-pressure tank, a test end of the second test batch or the first test batch, a gas discharge pipe for discharging the gas from the high-pressure tank, and a discharge flowing through the gas discharge pipe A heat exchanger for exchanging heat between the gas and the supply gas flowing through the gas supply pipe.

  In this airtight test apparatus, the exhaust gas from the test-finished high-pressure tank is not sent to the test standby high-pressure tank but is used for heat exchange with the pressurized gas supplied to the test standby high-pressure tank. As described above, the temperature of the gas discharged from the high-pressure tank at the end of the test is lowered due to adiabatic expansion during discharge, so the heat of the pressurized gas is absorbed during heat exchange to increase the temperature of the high-pressure tank waiting for the test. suppress. According to this, it is possible to suppress the temperature rise of the high-pressure tank (test standby high-pressure tank) without supplying cold from outside, and the cooling time until the high-pressure tank reaches room temperature can be shortened.

  According to the present invention, it is possible to shorten the tank cooling time and hence the test process time.

  Hereinafter, the configuration of the present invention will be described in detail based on an example of an embodiment shown in the drawings.

  1 to 8 show an embodiment of the present invention. The airtight test apparatus 1 according to the present invention is an apparatus for testing the airtightness of the high-pressure tank 2, and is suitable as an apparatus for testing the airtightness of a high-pressure hydrogen tank for a fuel cell, for example. In addition, the airtight test apparatus 1 according to the present invention suppresses the temperature rise of the test high-pressure tank 2 to be tested, thereby shortening the tank cooling time and shortening the test process time.

<First Embodiment>
The airtight test apparatus 1 according to the present embodiment includes a first test batch 11 in which a high-pressure tank 2 for test is installed, a second test batch 12 in which another high-pressure tank 2 for test is installed, and a high-pressure tank connection. It is comprised as an apparatus provided with the piping 3 for connection, the piping opening-and-closing valve 8 for connection, and the gas accumulator 6 (refer FIG. 1).

  The test batch refers to a group of processing groups or installation spaces in which at least one high-pressure tank 2 can be installed. For example, in the present embodiment, the first test batch 11 and the second test batch 12 are provided. (See FIG. 1). 1 shows test batches 11 and 12 to which three high-pressure tanks 2 can be connected, but this is only an example, and the number of high-pressure tanks 2 that can be connected to each test batch 11 and 12 is appropriate. It is possible to change.

  The high-pressure tank connection pipe 3 is a pipe for connecting the test high-pressure tank 2 of the first first test batch 11 and the test high-pressure tank 2 of the second test batch 12 (FIG. 1). reference). In the airtight test apparatus 1 according to the present embodiment, the high pressure tank connection pipe 3 is used to test the high pressure gas in the high pressure tank 2 for which the test has been completed (the test standby state). It is possible to feed directly into the high pressure tank 2.

  On this high pressure tank connection pipe 3, a connection pipe opening / closing valve 8 is installed (see FIG. 1). This connection pipe opening / closing valve 8 is for opening and closing the high pressure tank connection pipe 8. For example, if this connection pipe opening / closing valve 8 is opened, it is connected to one end of the high pressure tank connection pipe 3. The gas can be circulated until the internal pressure of the high-pressure tank 2 is equal to the internal pressure of the high-pressure tank (high-pressure tank waiting for test) 2 to be tested after that time.

  The gas accumulator 6 is for supplying gas to a high pressure tank 2 (high pressure tank in standby for testing) 2 to be tested after the time point in the first test batch 11 or the second test batch 12 until a predetermined pressure is reached. It is a gas supply source. In this embodiment, three high-pressure gas cylinders arranged in parallel as such a gas pressure accumulator 6 are illustrated (see FIG. 1), but this is only an example, and the number and form are particularly limited. It will never be done.

  The gas supply pipe 4 is a pipe for connecting the gas accumulator 6 and the high-pressure tank 2 of each of the test batches 11 and 12 (see FIG. 1). On this gas distribution pipe 4, a supply pipe opening / closing valve 9 for opening and closing the pipe is installed.

  The gas discharge pipe 5 is a pipe for discharging the gas in the test high-pressure tank (test high-pressure tank) 2 for which the airtight test has been completed (see FIG. 1). On the gas discharge pipe 5, a discharge pipe opening / closing valve 10 for opening and closing the pipe is installed.

  The recovery tower 13 is a recovery device for recovering at least a part of the gas discharged from the test-finished high-pressure tank 2. One end of the above-described gas discharge pipe 5 is connected to the recovery tower 13 (see FIG. 1).

  The compressor 14 is a device that fills the accumulator 6 with a gas for an airtight test. For example, in this embodiment, the compressor 14 is installed between the recovery tower 13 and the pressure accumulator 6 so that the recovered gas can be sent again to the pressure accumulator 6 (see FIG. 1).

  An airtight test using the airtight test apparatus 1 of the present embodiment as described above will be described below.

  First, for each of the first test batch 11 and the second test batch 12, for example, three high-pressure tanks 2 are arranged in the present embodiment (see FIG. 1). However, the high-pressure tank 2 in one test batch (for example, the first test batch 11) has been subjected to the airtight test, and the high-pressure tank 2 in the other test batch (second test batch 12) has been airtight after that time. You are waiting to take the exam. Hereinafter, the test batch on the high-pressure tank 2 side where the airtight test has been completed is also referred to as “test completion batch”, and the test batch on the high-pressure tank 2 side in which the test is on standby is also referred to as “test standby batch”. The test end batch at this time is the first test batch 11, and the test standby batch is the second test batch 12.

  Here, the connection pipe on / off valve 8 is opened with the supply pipe on / off valve 9 and the discharge pipe on / off valve 10 closed (see FIG. 1). By doing so, the high-pressure gas after completion of the test is directly sent from the high-pressure tank 2 of the test end batch 11 to the high-pressure tank 2 of the test standby batch 12 through the high-pressure tank connection pipe 3 (see FIG. 1). In addition, at this time, the gas discharged from the high-pressure tank 2 (test-end high-pressure tank) 2 of the test-end batch 11 is adiabatically expanded when the gas is discharged from the high-pressure tank 2 and the temperature is lowered. In the present embodiment, since the cold gas whose temperature has decreased in this way is directly sent to the high-pressure tank (test standby high-pressure tank) 2 of the test standby batch 12, it is not necessary to supply cold heat from the outside of the airtight test apparatus 1. Also, the temperature rise of the test standby high-pressure tank 2 can be suppressed. According to this, since the cooling time until the high-pressure tank 2 reaches room temperature can be shortened, the process time required for the airtight test can be shortened.

  In this way, the exhaust gas from the high pressure tank 2 at the end of the test is sent to the test standby high pressure tank 2, and when the pressures of both the high pressure tanks 2 are balanced, the connection pipe opening / closing valve 8 is closed. Incidentally, if the pressure value in each device is shown as an example here, the internal pressure of the accumulator 6 is 90 MPa, the gas pressure change of the high pressure tank 2 at the end of the test is 70 → 35 MPa, and the gas pressure change of the test standby high pressure tank 2 is 0 → 35 MPa. It is. Furthermore, the pressure in the recovery tower 13 is, for example, about 0.8 MPa.

  In the present embodiment, the remaining gas in the test completion tank 2 after the pressure is balanced is recovered by the recovery tower 13. In this case, the discharge pipe opening / closing valve 10 is opened, and the remaining gas is recovered through the gas discharge pipe 5 (see FIG. 1).

  Further, the supply pipe opening / closing valve 9 is opened, and gas is supplied from the gas accumulator 6 to the test standby high-pressure tank 2 through the gas supply pipe 4 (see FIG. 1). When the internal pressure of the test standby high-pressure tank 2 reaches a predetermined value, the gas supply is stopped and the process proceeds to the implementation of an airtight test for the test standby high-pressure tank 2. According to the above series of procedures, it is possible to shorten the cooling time until the test standby high-pressure tank 2 reaches room temperature and shift to the airtight test.

  Further, in the present embodiment, after the remaining gas in the test end high-pressure tank 2 (of the test end batch 11) is recovered by the recovery tower 13, the next test is performed when the test end high-pressure tank 2 is reduced to about normal pressure. It is supposed to be replaced with another high-pressure tank 2 for the test. In such a case, the test high-pressure tank 2 after replacement becomes the next test standby high-pressure tank 2, and the exhaust gas of the test-finished high-pressure tank 2 (the high-pressure tank 2 of the test standby batch 12 that has been waiting for the test so far) is this time. The next test standby high-pressure tank 2 can be fed. In this way, if the procedure of sequentially replacing the high-pressure tank 2 one by one is repeated, the cooling time can be shortened in each process, so the total process time is greatly reduced and the airtight test is performed more efficiently. Is possible. In this procedure, the test end batch and the test standby batch are alternately switched between the two batches 11 and 12.

  As described so far, the airtight test apparatus 1 according to the present embodiment simultaneously performs gas discharge from the test completion tank 2 and cold gas supply to the test standby tank 2 by making the airtight test into two batches (multiple batches). The configuration can be performed. According to this, it is possible to suppress the temperature rise of the high-pressure tank 2, and the cooling time until it reaches room temperature can be shortened, so that the test process time can be shortened (see FIG. 2).

<Second Embodiment>
Next, a second embodiment of the present invention will be described (see FIG. 3). The airtight test apparatus 1 in this embodiment includes a first test batch (test end batch) 11 in which a test high-pressure tank (test end tank) 2 is installed, and another test high-pressure tank (test standby tank) 2. Is configured as a device including a second test batch (test standby batch) 12, a gas supply pipe 4, a gas discharge pipe 5, a gas pressure accumulator 6, and a heat exchanger 7. Yes.

  The gas supply pipe 4 is a pipe connecting the gas pressure accumulator 6 and the test high-pressure tank 2 of the first test batch 11 or the second test batch 12. In addition, the gas discharge pipe 5 is a pipe for discharging the gas from the high-pressure tank 2 at the end of the test of the second test batch 12 or the first test batch 11, and is connected to the recovery tower 13 (FIG. 3). reference).

  The heat exchanger 7 is a heat exchange device for exchanging heat between the exhaust gas flowing through the gas discharge pipe 5 and the supply gas flowing through the gas supply pipe 4. The heat exchanger 7 of the present embodiment is arranged so that the gas supply pipe 4 and the gas discharge pipe 5 pass through the heat exchanger 7 (see FIG. 3).

  On the pipe connecting the gas supply pipe 4 and the gas discharge pipe 5, a connection pipe opening / closing valve 8 'is installed. A supply pipe opening / closing valve 9 for opening and closing the pipe is installed on the gas distribution pipe 4. Further, a discharge pipe opening / closing valve 10 for opening and closing the pipe is installed on the gas discharge pipe 5 (see FIG. 3).

  An airtight test using the airtight test apparatus 1 having the above configuration will be described below.

  In the first test batch 11 and the second test batch 12, for example, three test high-pressure tanks 2 are arranged, respectively, as in the above-described embodiment (see FIG. 3). In this case, the high-pressure tank 2 in one test batch (first test batch 11) has been subjected to the airtight test, and the high-pressure tank 2 in the other test batch (second test batch 12) has been airtight after that time. You are waiting to take the exam.

  Here, the supply pipe on / off valve 9 is opened with the connection pipe on / off valve 8 ′ closed, and gas is supplied from the pressure accumulator 6 to the test standby tank 2. At the same time, the discharge pipe opening / closing valve 10 is opened, and the gas in the high pressure tank 2 at the end of the test is discharged (see FIG. 3). At this time, the gas adiabatically expands and the temperature decreases. Here, in the airtight test apparatus 1 according to the present embodiment including the heat exchanger 7, heat is generated between the exhaust gas whose temperature is decreased in this way and the supply gas which is supplied to the test standby tank 2 and whose temperature is increased. The temperature of the supply gas is decreased during the supply. For this reason, since the temperature rise of the test standby high-pressure tank 2 can be suppressed without supplying cold heat from the outside of the air-tightness test apparatus 1, the cooling time until the high-pressure tank 2 reaches room temperature is shortened and airtightness is reduced. It is possible to shorten the process time required for the test.

  At the stage where the airtight test for the test standby high-pressure tank 2 is completed (or the previous stage), the test-finished high-pressure tank 2 (of the test-end batch 11) is replaced with another high-pressure tank 2 for testing which is the next test target. It is good as well. In such a case, the test high-pressure tank 2 after replacement becomes the next test standby high-pressure tank 2, and the gas supplied to the high-pressure tank 2 and the test-finished high-pressure tank 2 (the test standby batch 12 that has been waiting for the test until then). It is possible to carry out heat exchange with the exhaust gas of the high-pressure tank 2). In this way, if the procedure of sequentially replacing the high-pressure tank 2 one by one is repeated, the cooling time can be shortened in each process, so the total process time is greatly reduced and the airtight test is performed more efficiently. Is possible. In this procedure, the test end batch and the test standby batch are alternately switched between the two batches 11 and 12.

  As described so far, the airtight test apparatus 1 of the present embodiment constructs two batches (multiple batches) of the airtight test, and the exhaust gas from the test end tank 2 and the supply gas to the test standby tank 2 The heat exchange can be performed between the two. According to this, the temperature rise of the high-pressure tank 2 can be suppressed, and the cooling time until it reaches room temperature can be shortened, so that the test process time can be shortened (see FIG. 4).

<Third Embodiment>
The test process of the first embodiment described above and the test process of the second embodiment can also be implemented in combination. Hereinafter, it demonstrates as the 3rd Embodiment of this invention (refer FIGS. 5-8). In addition, in FIGS. 5-7, an example of the pressure value in each apparatus is also described collectively.

  The airtight test apparatus 1 in this embodiment is different from the first test batch (test end batch) 11 in which the high-pressure tank for test (test end tank) 2 is installed, as in the apparatus in the second embodiment. Second test batch (test standby batch) 12 in which a high-pressure tank for test (test standby tank) 2 is installed, a gas supply pipe 4, a gas discharge pipe 5, a gas pressure accumulator 6, and a heat exchanger 7 (see FIG. 5 and the like).

  In this airtightness test step, first, all of the connection pipe on / off valve 8, the supply pipe on / off valve 9, and the discharge pipe on / off valve 10 are closed (see FIG. 5). The pressure values (one example) in each apparatus at this time are 90 MPa for the pressure accumulator 6, 70 MPa for the high-pressure tank 2 at the end of the test, 0 MPa for the test standby high-pressure tank 2, and 0.8 MPa for the recovery tower 13.

  Next, the connection pipe on / off valve 8 is opened with the supply pipe on / off valve 9 and the discharge pipe on / off valve 10 closed (see FIG. 6). By doing so, the high-pressure gas after the completion of the test is directly sent from the high-pressure tank 2 of the test-finished batch 11 to the high-pressure tank 2 of the test standby batch 12 (see the bold line in FIG. 6). At this time, the gas discharged from the high-pressure tank 2 at the end of the test is adiabatically expanded and the temperature is lowered, so that the temperature rise of the test standby high-pressure tank 2 is suppressed without supplying cold heat from the outside of the airtight test apparatus 1. be able to. This process is carried out until the pressures in the test end high pressure tank 2 and the test standby high pressure tank 2 are balanced at 35 MPa, for example (see FIG. 6).

  When the pressures of the two high-pressure tanks 2 are balanced, the connection pipe opening / closing valve 8 is closed, and the supply pipe opening / closing valve 9 and the discharge pipe opening / closing valve 10 are opened (see FIG. 7). In such a case, the gas in the high pressure tank 2 at the end of the test is discharged to the recovery tower 13 via the gas discharge pipe 5. Further, gas is supplied from the pressure accumulator 6 to the test standby high-pressure tank 2 through the gas supply pipe 4. At this time, heat is exchanged by the heat exchanger 7 between the exhaust gas, the temperature of which decreases due to adiabatic expansion, and the supply gas, which is supplied to the test standby tank 2 and increases in temperature, and the temperature of the supply gas is decreased during the supply. (See FIG. 7). Therefore, the temperature rise of the test standby high-pressure tank 2 can be suppressed.

  According to the above-described procedure, the temperature of the test standby high-pressure tank 2 is increased both in the step of directly sending the exhaust gas to the test standby high-pressure tank 2 and in the step of heat exchange with the remaining gas in the test high-pressure tank 2. Can be suppressed. In this way, in the case of this embodiment that suppresses the temperature rise of the test standby high-pressure tank 2 in two stages, the cooling time can be further shortened and the process time required for the airtight test can be shortened compared to the above-described embodiment. This is possible (see the bold line graph in FIG. 8).

  The above-described embodiment is an example of a preferred embodiment of the present invention, but is not limited thereto, and various modifications can be made without departing from the scope of the present invention. For example, in the present embodiment, the airtight test apparatus 1 in which the airtight test is divided into two batches has been described, but it is of course possible to increase the number of batches. In short, if it is possible to realize a plurality of batches, which has not been achieved in the past, and suppress an increase in the temperature of the high-pressure tank, it is possible to reduce the time required for cooling and thus the test process.

  In the above-described embodiment, the minimum required piping structure is shown in principle. However, for example, as described above, it is necessary when the airtight test is performed by the procedure in which the test end batch and the test standby batch are alternately switched. What is necessary is just to comprise suitably other piping used.

  In addition, the above-described airtight test can be performed using He gas, for example, when a high-pressure hydrogen tank for a fuel cell is used as a test target. However, this He gas is only an example, and other gases are used. It is also possible. Furthermore, the high-pressure hydrogen tank illustrated here is only an example of the high-pressure tank 2 to be tested, and the other high-pressure tanks can naturally be tested.

It is a figure which shows the structure of the apparatus for an airtight test in the 1st Embodiment of this invention. It is a graph which shows an example of the temperature change of a high pressure tank, and represents the case in 1st Embodiment with the continuous line, and the conventional example with the broken line, respectively. It is a figure which shows the structure of the apparatus for an airtight test in the 2nd Embodiment of this invention. It is a graph which shows an example of the temperature change of a high pressure tank, and represents the case in 2nd Embodiment with the continuous line, and the conventional example with the broken line, respectively. It is a figure which shows the structure of the apparatus for an airtight test in the 3rd Embodiment of this invention. In 3rd Embodiment of this invention, it is a figure which shows a mode that gas is directly sent from a test completion | finish high pressure tank to a test standby high pressure tank. In the 3rd Embodiment of this invention, it is a figure which shows a mode that heat exchange is performed between the exhaust gas which temperature falls by adiabatic expansion, and the supply gas which is supplied to a test standby tank and a temperature rises. It is a graph which shows an example of the temperature change of a high pressure tank, The case in 3rd Embodiment is represented by the continuous line, the example of a prior art is represented by the broken line, and the case in 2nd Embodiment is each represented by the dashed-two dotted line.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 ... Airtight test apparatus of a high pressure tank, 2 ... High pressure tank, 3 ... High pressure tank connection piping, 4 ... Gas supply piping, 5 ... Gas discharge piping, 6 ... Gas pressure accumulator, 7 ... Heat exchanger, 8 ... Connection pipe open / close valve (valve installed in connection pipe), 11 ... Test end batch (first test batch), 12 ... Test standby batch (second test batch), 13 ... Recovery tower (collector) )

Claims (5)

In a method for testing the tightness of a high pressure tank,
Prepare several high-pressure tanks for testing,
Of these multiple high-pressure tanks for testing, the high-pressure gas in the high-pressure tank that has been tested is sent to the test standby high-pressure tank to be tested after that time,
After the pressure of the test high pressure tank and the test standby high pressure tank are balanced,
Gas is supplied from the gas accumulator to the test standby high-pressure tank until a predetermined pressure is reached,
An airtight test is performed on the test standby high-pressure tank supplied with the gas.   2. The gas-tightness test of the high-pressure tank according to claim 1, wherein the remaining gas in the high-pressure tank at the end of the test is recovered by a recovery device, and the high-pressure tank at the end of the test is replaced with a high-pressure tank for a test to be tested next. Method. In a method for testing the tightness of a high pressure tank,
Prepare several high-pressure tanks for testing,
Heat exchange is performed between the gas discharged from the high-pressure tank for which the test has been completed and the pressurized gas supplied from the gas accumulator to the test standby high-pressure tank to be tested after that time. Done
An airtight test method for a high-pressure tank, comprising performing an airtight test on the test standby high-pressure tank supplied with the gas until a predetermined pressure is reached. In an apparatus for testing the tightness of a high-pressure tank,
A first test batch in which a high-pressure tank for testing is installed;
A second test batch in which a separate high-pressure tank for testing is installed;
A high-pressure tank connection pipe connecting the test high-pressure tank of the first test batch and the test high-pressure tank of the second test batch;
A valve installed in the connecting pipe;
A gas pressure accumulator for supplying gas to the test standby high-pressure tank of the first test batch or the second test batch until a predetermined pressure is reached;
A device for airtight testing of a high-pressure tank, comprising: In an apparatus for testing the tightness of a high-pressure tank,
A first test batch in which a high-pressure tank for testing is installed;
A second test batch in which a separate high-pressure tank for testing is installed;
A gas pressure accumulator for supplying gas to the test standby high-pressure tank of the first test batch or the second test batch until a predetermined pressure is reached;
A gas supply pipe connecting the gas accumulator and the test high-pressure tank of the first test batch or the second test batch;
A gas exhaust pipe for discharging the gas from the high-pressure tank at the end of the test of the second test batch or the first test batch;
A heat exchanger for exchanging heat between the exhaust gas flowing through the gas exhaust pipe and the supply gas flowing through the gas supply pipe;
A device for airtight testing of a high-pressure tank, comprising:

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