JP2007225435A - Pressure resistance testing method of pressure container and pressure resistance testing machine - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a pressure resistance testing method of a pressure container constituted so that the deformation of the partition wall provided in the pressure container is suppressed during a test, and also to provide a pressure resistance testing machine. <P>SOLUTION: In the pressure resistance testing method of the pressure container 201 equipped with the partition wall deformed corresponding to pressure, the pressure container 201 is arranged in a hermetically closable test tank 10, and the pressure of the internal space 10a of the test tank 10 is increased up to test pressure in the state where the test tank 10 is hermetically closed, also to increase the internal pressure of a first chamber R1 and the internal pressure of a second chamber R2 to the test pressure, and to respectively cut off the communication of the internal space 10a of the test tank 10 with the inside of the first chamber R1 and the communication of the internal space 10a of the test tank 10 with the inside of the second chamber R2. Thus, after the pressure of the internal space 10a of the test tank 10 is decreased, the pressure of the internal space 10a of the test tank 10, the internal pressure of the first chamber R1, and the internal pressure of the second chamber R2 are respectively monitored in the state where the test tank 10 is hermetically closed. <P>COPYRIGHT: (C)2007,JPO&INPIT

Description

  The present invention relates to a pressure vessel pressure test method and a pressure test apparatus for testing pressure vessel pressure resistance performance.

  Generally, in a pressure test of a pressure vessel, a fluid such as a gas or a liquid is poured into the pressure vessel, and whether the internal pressure does not decrease is measured in a state where the inside is filled with the fluid at a high pressure. In the case of specific products, tests based on the High Pressure Gas Safety Law are required.

  And, in the case where a partition that is deformed according to pressure is provided inside the pressure vessel, such as a metal bellows type accumulator, the partition is not plastically deformed or damaged during a pressure test. Must do so. This point will be described with reference to FIG. FIG. 5 is a schematic view showing a pressure vessel testing method according to a conventional example.

  The metal bellows type accumulator 200 includes a pressure vessel 201 and a metal bellows 202 as a partition wall provided inside the pressure vessel 201. The inside of the pressure vessel 201 is divided into a first chamber R1 and a second chamber R2 by a metal bellows 202. Further, the pressure vessel 201 is provided with a first communication hole 201a that communicates the interior of the first chamber R1 and the outside of the container, and a second communication hole 201b that communicates the interior of the second chamber R2 and the exterior of the container. Yes. When the product is used, a liquid such as oil is fed into the first chamber R1, and a gas such as nitrogen is sealed in the second chamber R2.

  When performing the pressure resistance test of the metal bellows type accumulator 200 configured as described above, first, the tubes 301 and 302 are connected to the pressure vessel 201 as shown in FIG. Then, fluid (gas or liquid) is poured into the first chamber R1 and the second chamber R2, respectively, and the internal pressure in these chambers is increased to a predetermined test pressure. Thereafter, it is measured whether or not the internal pressure in each chamber does not decrease in a state where the fluid is sealed.

  Here, in the process of increasing the internal pressure in each chamber, or in the process of decreasing the pressure after completion of the measurement (inspection), the metal bellows 202 is deformed when a difference occurs in the internal pressure in each chamber. If the pressure difference becomes too large, the metal bellows 202 is greatly deformed and plastically deformed or damaged. Therefore, in order not to adversely affect the metal bellows 202 at the time of the test, the internal pressures must be kept in balance in the process of increasing the internal pressure in each chamber or decreasing the internal pressure.

  However, because the internal pressure in each chamber must be measured, the flow path configuration including a pipe or the like for feeding fluid into the first chamber R1 and the fluid for feeding the fluid into the second chamber R2 The flow path structure which consists of a pipe | tube etc. is comprised independently, respectively. For this reason, the internal pressure in the chamber of the first chamber R1 and the internal pressure of the chamber in the second chamber R2 are changed due to various factors such as a difference in the volume of the entire flow path, a difference in pipe resistance, and clogging of the pipe. It is practically difficult to increase the internal pressure or decrease the internal pressure while keeping them together.

  Thus, in the case of the conventional test method, when the pressure in each chamber is increased or decreased, the internal pressure in the first chamber R1 and the internal pressure in the second chamber R2 are balanced. Is difficult, and the metal bellows 202 may be deformed during the test. Therefore, the metal bellows 202 may be plastically deformed or damaged during the test.

In addition, there exists a technique disclosed by patent document 1, 2 as a related technique.
JP 2000-352497 A Japanese Patent Publication No. 06-63950

  It is an object of the present invention to provide a pressure vessel pressure test method and a pressure test device for suppressing deformation of a partition wall provided in a pressure vessel during a test.

  The present invention employs the following means in order to solve the above problems.

That is, the pressure test method of the pressure vessel of the present invention is:
The interior of the container is divided into a first chamber and a second chamber by a partition wall that deforms according to pressure, and the first communication hole that communicates the first chamber and the outside of the container and the second chamber and the exterior of the container communicate with each other. In a pressure test method for a pressure vessel having a second communication hole,
A first step of placing a pressure vessel to be tested in a sealable test chamber;
After the first step, the internal pressure of the first chamber and the internal pressure of the second chamber are increased through the first communication hole and the second communication hole by increasing the pressure in the internal space of the test tank to the test pressure with the test tank sealed. A second step of increasing the pressure to the test pressure;
After the second step, a third step of blocking communication between the internal space of the test chamber and the first chamber and between the internal space of the test chamber and the second chamber;
After the third step, a fourth step of reducing the pressure in the internal space of the test tank (for example, reducing to the atmospheric pressure);
After the fourth step, in a state where the test tank is sealed, a fifth step for monitoring the pressure in the internal space of the test tank, the internal pressure in the first chamber, and the internal pressure in the second chamber,
After the fifth step, a sixth step of increasing the pressure in the internal space of the test tank (desirably increasing to the test pressure again),
After the sixth step, a seventh step of communicating between the internal space of the test chamber and the first chamber and between the internal space of the test chamber and the second chamber;
After the seventh step, an eighth step of reducing the pressure in the internal space of the test tank,
It is characterized by providing.

  According to the present invention, in the second step, the internal space of the test tank is connected to the test pressure in a state where the internal space of the test tank and the first chamber and the internal space of the test tank and the second chamber communicate with each other. To increase the internal pressure in the first chamber and the internal pressure in the second chamber to the test pressure. Therefore, in a state where the internal pressure in the first chamber and the internal pressure in the second chamber are balanced, these internal pressures can be increased to the test pressure.

  In addition, in the seventh step, the pressure in the internal space of the test chamber is communicated between the internal space of the test chamber and the first chamber and between the internal space of the test chamber and the second chamber. Reduce. Therefore, these internal pressures can be reduced in a state where the internal pressure in the first chamber and the internal pressure in the second chamber are balanced. Then, after increasing the pressure in the internal space of the test tank in the sixth step, the internal space of the test tank and the first chamber and the internal space of the test tank and the second chamber are communicated in the seventh step. Then, since the pressure is lowered thereafter, it is possible to suppress a sudden drop in the internal pressures in the first chamber and the second chamber. Thereby, when reducing the pressure in each chamber, the internal pressure in the first chamber and the internal pressure in the second chamber can be balanced more stably.

Also, a pressure test apparatus used in the pressure test method of the pressure vessel,
The test chamber;
A first tubular member and a second tubular member configured to be reciprocally movable while being inserted from the outside to the inside of the test tank;
With
By bringing the tip of the first tubular member into contact with the pressure vessel, the pipe of the first tubular member communicates with the first chamber, and by bringing the tip of the second tubular member into contact with the pressure vessel, the second tubular member The pipe and the second chamber communicate with each other, and are configured to block communication between the internal space of the test chamber and the first chamber and between the internal space of the test chamber and the second chamber, respectively.
And by separating the front-end | tip of a 1st tubular member and the front-end | tip of a 2nd tubular member from a pressure vessel, between the interior space of a test tank and a 1st chamber, and between the interior space of a test tank and a 2nd chamber. It is configured to communicate with each other.

  With the pressure test apparatus configured as described above, the above pressure test can be suitably performed.

  As described above, according to the present invention, deformation of the partition provided in the pressure vessel can be suppressed.

  The best mode for carrying out the present invention will be exemplarily described in detail below with reference to the drawings. However, the dimensions, materials, shapes, relative arrangements, and the like of the components described in this embodiment are not intended to limit the scope of the present invention only to those unless otherwise specified. .

(Example)
With reference to FIGS. 1-4, the pressure test method and pressure test apparatus of the pressure vessel which concern on the Example of this invention are demonstrated. In the present embodiment, a case of a metal bellows type accumulator will be described as an example of a pressure vessel. As described in the background art, the metal bellows type accumulator 200 includes a pressure vessel 201 and a metal bellows 202 as a partition provided inside the pressure vessel 201. The inside of the pressure vessel 201 is divided into a first chamber R1 and a second chamber R2 by a metal bellows 202. Further, the pressure vessel 201 is provided with a first communication hole 201a that communicates the interior of the first chamber R1 and the outside of the container, and a second communication hole 201b that communicates the interior of the second chamber R2 and the exterior of the container. Yes. When the product is used, a liquid such as oil is fed into the first chamber R1, and a gas such as nitrogen is sealed in the second chamber R2.

<Configuration of pressure test device>
In particular, the configuration of a pressure test apparatus according to the present embodiment will be described with reference to FIG. FIG. 1 is a schematic configuration diagram of a pressure test apparatus according to an embodiment of the present invention.

  The pressure test apparatus 100 includes a test tank (chamber) 10, a first tubular member 20 and a second tubular member 30 configured to be reciprocally movable while being inserted from the outside of the test tank 10, and the test tank 10. And a pressure gauge 50 for measuring the pressure in the internal space 10a of the test tank 10 are provided.

  The test tank 10 includes a base 11 on which a metal bellows accumulator 200 that is a product to be tested is installed, and a cover 12 having a substantially bottomed cylindrical shape. An O-ring O1 is provided at the tip of the cylindrical portion of the cover 12. Thereby, the clearance gap between the base 11 and the cover 12 is sealed.

  The base 11 is provided with a cylindrical portion 11a, and the metal bellows type accumulator 200 can be fitted into the open end of the cylindrical portion 11a. In addition, slits 11b are provided at a plurality of locations at the tip of the cylindrical portion 11a. Since the inside and the outside of the cylindrical portion 11a communicate with each other by the slit 11b, the pressure in the pressure vessel 201 near the opening of the first communication hole 201a and the pressure near the opening of the second communication hole 201b can be equalized. The base 11 is provided with a through hole 11c, and the first tubular member 20 is inserted into the through hole 11c. An O-ring O2 is provided on the inner peripheral surface of the through hole 11c. This O-ring O2 seals the gap between the outer peripheral surface of the first tubular member 20 and the inner peripheral surface of the through hole 11c.

  The cover 12 is provided with a through hole 12a, and the second tubular member 30 is inserted into the through hole 12a. An O-ring O4 is provided on the inner peripheral surface of the through hole 12a. The gap between the outer peripheral surface of the second tubular member 30 and the inner peripheral surface of the through hole 12a is sealed by the O-ring O4. Further, the cover 12 is provided with a through hole 12b communicating with the inside of the tube on the pressure feeding mechanism 40 side and a through hole 12c communicating with the inside of the tube on the pressure gauge 50 side.

  The first tubular member 20 is configured to reciprocate by a hydraulic cylinder 21. Further, an O-ring O3 is provided at the tip of the first tubular member 20, and the inside of the first tubular member 20 and the first chamber R1 are brought into contact with the pressure vessel 201 by bringing the tip of the first tubular member 20 into contact with the pressure vessel 201. And the communication between the interior space 10a of the test chamber 10 and the first chamber R1 can be blocked. In addition, it cannot be overemphasized that between the interior space 10a of the test tank 10 and the room | chamber interior of 1st chamber R1 can be connected by separating the front-end | tip of the 1st tubular member 20 from the pressure vessel 201. FIG. Further, a pressure gauge 22 for measuring the internal pressure in the pipe of the first tubular member 20 is provided. By measuring the pressure with the pressure gauge 22 in a state where the tip of the first tubular member 20 is in contact with the pressure vessel 201, the internal pressure in the first chamber R1 can be measured.

  The second tubular member 30 is configured to reciprocate by a hydraulic cylinder 31. Further, an O-ring O5 is provided at the tip of the second tubular member 30, and by bringing the tip of the second tubular member 30 into contact with the pressure vessel 201, the inside of the second tubular member 30 and the second chamber R2 are provided. And the communication between the internal space 10a of the test chamber 10 and the second chamber R2 can be blocked. In addition, it cannot be overemphasized that between the interior space 10a of the test tank 10 and the room | chamber interior of 2nd chamber R2 can be connected by separating the front-end | tip of the 2nd tubular member 30 from the pressure vessel 201. FIG. Further, a pressure gauge 32 that measures the internal pressure in the pipe of the second tubular member 30 is provided. By measuring the pressure with the pressure gauge 32 in a state where the tip of the second tubular member 30 is in contact with the pressure vessel 201, the internal pressure in the second chamber R2 can be measured.

  The pressure feeding mechanism 40 is provided in a pipe connecting the pump 41, a valve 42 provided in the pipe connecting the pump 41 and the internal space 10 a of the test tank 10, and the air and the internal space 10 a of the test tank 10. A valve 43, a safety valve 44 for releasing the pressure to the atmosphere when the pressure in the pipe line connecting the pump 41 and the internal space 10a of the test tank 10 exceeds a certain level, and the internal space of the pump 41 and the test tank 10 And a pressure gauge 45 for measuring the pressure in the pipe line connecting to 10a.

<Pressure resistance test method>
In particular, the pressure resistance test method according to the present embodiment will be described according to the test procedure with reference to FIGS. 2-4 is a schematic block diagram which shows the mode of the pressure | voltage resistant test method based on the Example of this invention.

<< First Step >>
First, a metal bellows type accumulator 200 (pressure vessel 201) to be tested is placed in the test tank 10. At this time, the tip end of the first tubular member 20 and the tip end of the second tubular member 30 are kept from contacting the pressure vessel 201 (see FIG. 2).

<< Second Step >>
Next, in a state where the test tank 10 is sealed, the high pressure gas is fed into the internal space 10a of the test tank 10 by the pressure feeding mechanism 40, and the pressure in the internal space 10a is increased to the test pressure (about 30 MPa in this embodiment). As a result, the internal pressure in the first chamber R1 and the internal pressure in the second chamber R2 also increase to the test pressure through the first communication hole 201a and the second communication hole 201b. When the test pressure is increased, the valve 42 is closed to keep the pressure in the internal space 10a at the test pressure.

<< Third Step >>
Next, the tip of the first tubular member 20 and the tip of the second tubular member 30 are brought into contact with the pressure vessel 201 (see FIG. 3). Thereby, the inside of the tube of the first tubular member 20 communicates with the interior of the first chamber R1, and the communication between the internal space 10a of the test tank 10 and the interior of the first chamber R1 is blocked. Further, the inside of the tube of the second tubular member 30 communicates with the inside of the second chamber R2, and the communication between the internal space 10a of the test tank 10 and the inside of the second chamber R2 is blocked.

<< 4th process >>
Next, the valve 43 is opened, and the pressure in the internal space 10a of the test tank 10 is reduced to atmospheric pressure. At this time, as described above, the communication between the internal space 10a of the test chamber 10 and the interior of the first chamber R1, and the communication between the internal space 10a of the test chamber 10 and the interior of the second chamber R2 are blocked. Therefore, the internal pressure in the first chamber R1 and the internal pressure in the second chamber R2 are maintained at the test pressure unless there is an abnormality.

<< 5th process >>
Next, the valve 43 is closed and the test chamber 10 is sealed again. In this state, the pressure in the internal space 10a of the test chamber 10, the internal pressure in the first chamber R1, and the internal pressure in the second chamber R2 are respectively monitored by the pressure gauges 50, 22, and 32 for a predetermined time. To do.

  Here, if there is no pressure increase in the internal space 10a, there is no pressure drop in the internal pressure of the first chamber R1 or the internal pressure of the second chamber R2, and there is no pressure difference between them, a metal bellows type accumulator It can be determined that there is no abnormality in 200 (pressure vessel 201).

  On the other hand, when the pressure in the internal space 10a of the test tank 10 rises, it can be determined that the pressure vessel 201 is defective or the O-rings O3 and O5 have defective sealing properties. In addition, when a decrease in at least one of the internal pressure in the first chamber R1 and the internal pressure in the second chamber R2 is recognized, the metal bellows 202 is defective or the pressure test apparatus 100 Judge that there is a defect.

<< 6th process >>
After the inspection is completed, that is, the determination of whether or not the metal bellows type accumulator 200 (pressure vessel 201) is normal is completed, the high pressure gas is sent again into the internal space 10a of the test tank 10 by the pressure feeding mechanism 40. The pressure in the space 10a is increased. In the present embodiment, the pressure in the internal space 10a is increased to the test pressure in order to equalize the internal pressure in the first chamber R1 and the internal pressure in the second chamber R2.

<< Seventh Step >>
Next, the tip of the first tubular member 20 and the tip of the second tubular member 30 are respectively connected to the pressure vessel 201.
(See FIG. 4). Thereby, communication is established between the internal space 10a of the test chamber 10 and the first chamber R1, and between the internal space 10a of the test chamber 10 and the second chamber R2. Since the pressure in the internal space 10a of the test chamber 10, the internal pressure in the first chamber R1, and the internal pressure in the second chamber R2 are the same before communication, the pressure in each part varies even when they are connected. do not do.

<< 8th step >>
Next, the valve 43 is opened, and the pressure in the internal space 10a of the test tank 10, the internal pressure in the first chamber R1, and the internal pressure in the second chamber R2 are reduced to atmospheric pressure. In the seventh step, the pressure in the internal space 10a is a test pressure, and it is dangerous to open the cover 12 in this internal pressure state. Therefore, in this step, the valve 43 is opened to open the internal space 10a. The pressure is reduced to atmospheric pressure.

  The test is thus completed, the cover 12 is opened, and the metal bellows type accumulator 200 is taken out.

<Excellent points of this embodiment>
According to the present embodiment, in the second step, the communication between the internal space 10a of the test tank 10 and the interior of the first chamber R1 and between the internal space 10a of the test tank 10 and the interior of the second chamber R2 is established. In the state, by raising the internal space 10a of the test tank 10 to the test pressure, the internal pressure of the first chamber R1 and the internal pressure of the second chamber R2 are increased to the test pressure. Therefore, in a state where the internal pressure of the first chamber R1 and the internal pressure of the second chamber R2 are balanced, these internal pressures can be increased to the test pressure.

  Further, in the seventh step, after the communication between the internal space 10a of the test chamber 10 and the interior of the first chamber R1 and between the internal space 10a of the test chamber 10 and the interior of the second chamber R2, the eighth step is performed. In the process, the pressure in the internal space 10a of the test tank 10 is reduced. Therefore, these internal pressures can be reduced in a state where the internal pressure in the first chamber R1 and the internal pressure in the second chamber R2 are balanced.

  And after raising the pressure of the internal space 10a of the test tank 10 to the test pressure in the sixth step, between the internal space 10a of the test tank 10 and the chamber of the first chamber R1 and the inside of the test tank 10 in the seventh step. The space 10a is communicated with the second chamber R2, and then the valve 43 is opened to reduce the pressure. Therefore, it can suppress that the internal pressure of the room | chamber interior of 1st chamber R1 and the 2nd chamber R2 falls rapidly. Thereby, when lowering the pressure in each room, the internal pressure in the first chamber R1 and the internal pressure in the second chamber R2 can be balanced more stably. Further, since the internal space 10a of the test tank 10, the interior of the first chamber R1, and the interior of the second chamber R2 are decompressed in the same state, the O-rings O3 and O4 are prevented from being loaded during decompression. You can also.

  As described above, according to the present embodiment, when the pressure inside the pressure vessel 201 is increased and when the pressure is reduced during the test, the internal pressure in the first chamber R1 and the second pressure are increased. A state in which the internal pressure of the chamber R2 is balanced can be maintained. Thereby, it can suppress that the metal bellows 202 deform | transforms during a test, and the plastic deformation and damage of the metal bellows 202 can be prevented.

FIG. 1 is a schematic configuration diagram of a pressure test apparatus according to an embodiment of the present invention. FIG. 2 is a schematic configuration diagram showing a state of the pressure resistance test method according to the embodiment of the present invention. FIG. 3 is a schematic configuration diagram showing a state of the pressure resistance test method according to the embodiment of the present invention. FIG. 4 is a schematic configuration diagram showing a state of the pressure resistance test method according to the embodiment of the present invention. FIG. 5 is a schematic view showing a pressure vessel testing method according to a conventional example.

Explanation of symbols

DESCRIPTION OF SYMBOLS 10 Test tank 10a Internal space 11 Base 11a Cylindrical part 11b Slit 11c Through-hole 12 Cover 12a, 12b, 12c Through-hole 20 1st tubular member 21 Hydraulic cylinder 22 Pressure gauge 30 2nd tubular member 31 Hydraulic cylinder 32 Pressure gauge 40 Pressure feeding mechanism 41 Pump 42, 43 Valve 44 Safety valve 45 Pressure gauge 50 Pressure gauge 100 Pressure resistance test device 200 Metal bellows type accumulator 201 Pressure vessel 201a First communication hole 201b Second communication hole 202 Metal bellows O1, O2, O3, O4, O5 O ring R1 1st room R2 2nd room

Claims (2)

The interior of the container is divided into a first chamber and a second chamber by a partition wall that deforms according to pressure, and the first communication hole that communicates the first chamber and the outside of the container and the second chamber and the exterior of the container communicate with each other. In a pressure test method for a pressure vessel having a second communication hole,
A first step of placing a pressure vessel to be tested in a sealable test chamber;
After the first step, the internal pressure of the first chamber and the internal pressure of the second chamber are increased through the first communication hole and the second communication hole by increasing the pressure in the internal space of the test tank to the test pressure with the test tank sealed. A second step of increasing the pressure to the test pressure;
After the second step, a third step of blocking communication between the internal space of the test chamber and the first chamber and between the internal space of the test chamber and the second chamber;
A fourth step of reducing the pressure in the internal space of the test tank after the third step;
After the fourth step, in a state where the test tank is sealed, a fifth step for monitoring the pressure in the internal space of the test tank, the internal pressure in the first chamber, and the internal pressure in the second chamber,
A sixth step of increasing the pressure in the internal space of the test tank after the fifth step;
After the sixth step, a seventh step of communicating between the internal space of the test chamber and the first chamber and between the internal space of the test chamber and the second chamber;
After the seventh step, an eighth step of reducing the pressure in the internal space of the test tank,
A pressure test method for a pressure vessel, comprising: A pressure test apparatus used in the pressure test method for a pressure vessel according to claim 1,
The test chamber;
A first tubular member and a second tubular member configured to be reciprocally movable while being inserted from the outside to the inside of the test tank;
With
By bringing the tip of the first tubular member into contact with the pressure vessel, the pipe of the first tubular member communicates with the first chamber, and by bringing the tip of the second tubular member into contact with the pressure vessel, the second tubular member The pipe and the second chamber communicate with each other, and are configured to block communication between the internal space of the test chamber and the first chamber and between the internal space of the test chamber and the second chamber, respectively.
And by separating the front-end | tip of a 1st tubular member and the front-end | tip of a 2nd tubular member from a pressure vessel, between the interior space of a test tank and a 1st chamber, and between the interior space of a test tank and a 2nd chamber. A pressure test apparatus configured to communicate with each other.

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