JPH08122234A - Pressure test method and equipment for pressure vessels - Google Patents

Abstract

(57) [Summary] [Purpose] In pressure resistance testing of pressure vessels such as bottles,
A pressure resistance test method for a pressure vessel and the like and a device therefor capable of detecting not only the pressure at the time of breaking but also the change in the pressing force during the breaking. [Structure] An accommodation liquid is accommodated in a test tank, and a test sample such as a pressure container for accommodating a pressurizing fluid is immersed in the accommodation liquid,
The pressurizing liquid in the test sample is pressurized by a pressurizing device with time, and the pressure resistance of a pressure vessel or the like for detecting the pressurizing state with time is tested. The device is installed at a position lower than the liquid level of the stored liquid in the test tank, and the pressurized connecting pipe is filled with the stored liquid in a siphon type. Is composed of a transfer barrier type accumulator that divides the air into liquid chambers and converts air pressure into liquid pressure,
An air chamber of the accumulator and a high-pressure air source are connected via an electropneumatic proportional valve that controls the air pressure in proportion to the voltage from the power source, and the voltage from the power source is controlled and supplied to the electropneumatic proportional valve. Those equipped with a control unit to operate.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a pressure test method for parts such as PET bottles, intake manifolds for automobiles, tubes, pipes (including pipes having a pinch-off portion), pressure vessels such as cans and bags, and the like. Regarding the device.

[0002]

2. Description of the Related Art The conventional technique is to detect the pressure at the time of breaking by applying water pressure to a pressure container such as a PET bottle with a quantitative water pressure pump.

[0003]

In a pressure resistance test of a pressure container such as a PET bottle, the conditions for pressurizing the container must be the same, so the pressure applied to the container is linear at a constant rate. Although it is preferable to change, in the pressure resistance test of the conventional technology, since a fixed amount of water is sent into a pressure container such as a PET bottle, not only can the pressure be increased linearly, but the volume of the container also changes. However, due to the occurrence of creep, the pressure inside the container is affected and changes, and there is a problem that the pressure cannot be increased at a constant rate.

[0004]

In view of the above, according to the present invention, a storage tank is filled with a storage liquid, and a test sample such as a pressure vessel for storing a pressurizing liquid is immersed in the storage liquid. It is an object of the present invention to provide a pressure resistance test method for a pressure vessel or the like, in which the pressurizing liquid is linearly pressurized by a pressurizing device and the pressurized state is detected with time. Also,
The present invention provides a pressure resistance test method for a pressure vessel or the like, characterized in that, in the test method, the containing liquid and the pressurizing liquid are composed of water or an aqueous solution. Further, in the present invention, in the above-mentioned test method, a pressurizing device for pressurizing the liquid in the test sample is installed at a position lower than the liquid level of the contained liquid in the test tank, and the pressurizing device for connecting the test sample and the pressurizing device is used. A pressure resistance test method for pressure vessels, etc., characterized in that the connecting pipe is filled with the siphon-type contained liquid and the test sample immersed in the test tank and the pressurizing device are liquid-tightly connected by the pressurizing connecting pipe. It is provided.

Further, according to the present invention, a test tank for accommodating a storage liquid of a predetermined temperature and for immersing a test sample such as a pressure container, a pressurizing device for pressurizing the pressurizing liquid in the test sample, and the test sample and pressurization. A connecting tube for pressurizing that connects the device, a pressure sensor that detects the pressurizing pressure over time, a display unit that is connected to the pressure sensor to display and record the pressurizing state, and a pressure sensor that connects to the pressure sensor. An object of the present invention is to provide a pressure resistance test device for a pressure vessel or the like, which comprises a control unit for controlling the pressurization state. The present invention also provides, in the above-mentioned pressure resistance test apparatus, a pressurizing device, an air chamber connecting one side to a high pressure air source with an elastic diaphragm in the pressure tank, and a liquid chamber connecting the other side to the pressurizing liquid in the test sample. The present invention provides a pressure resistance test device for a pressure vessel or the like, which is composed of a transfer barrier type accumulator that is divided into two parts and is configured to convert air pressure into liquid pressure.

According to the present invention, in the above apparatus, the air chamber of the transfer barrier type accumulator and the high-pressure air source are connected via an electropneumatic proportional valve for controlling the air pressure in proportion to the voltage from the power source, and the pressure is applied. The present invention provides a pressure resistance test device for a pressure vessel or the like, which is characterized by controlling the pressurization state of the pressure device. Further, in the present invention, in the above device, the voltage from the power source is controlled between the power source and the electropneumatic proportional valve, and the voltage from the power source is supplied to the electropneumatic proportional valve based on the detected pressure signal that detects the air pressure of the accumulator. The present invention provides a pressure resistance test device for a pressure vessel or the like, which is provided with a control unit.

[0007]

According to the pressure resistance test method for a pressure vessel or the like of the present invention having the above-mentioned structure, a test sample such as a pressure vessel in which a containing liquid is contained in a test tank and a pressurizing liquid is contained in the containing liquid is provided. Since it is possible to immerse and pressurize the pressurizing liquid in the test sample with time by a pressurizing device and to detect the pressurizing state with time, it is possible to detect a change in the pressurizing force on the way to destruction. The pressure in the test sample can be linearly changed at a constant rate according to the test conditions.

The present invention also provides the above-mentioned test method,
By configuring the contained liquid and the pressurizing liquid with water or an aqueous solution, the contained liquid and the pressurizing liquid can be easily managed and the temperature can be controlled, and the test tank can be easily made into a constant temperature bath at a predetermined temperature. Further, the present invention, in the above test method,
A pressurizing device that pressurizes the liquid in the test sample is installed at a position lower than the liquid level of the contained liquid in the test tank, and the siphon-type filled liquid is filled in the pressurizing connecting pipe that connects the test sample and the pressurizing device. Since the test sample immersed in the test tank and the pressurizing device can be liquid-tightly connected by the pressurizing connecting tube, it is possible to easily prevent air from flowing into the pressurizing liquid.

Further, according to the pressure resistance test apparatus for a pressure vessel or the like according to the present invention, the holding liquid at a predetermined temperature is stored in a test tank in which the test sample is immersed, and the pressurizing liquid in the test sample is pressurized. The pressurizing device and the test sample are connected by a connecting tube for pressurizing and pressurizing, the pressurizing pressure is detected with a pressure sensor over time, and the pressurizing state is displayed and recorded on the display connected to the pressure sensor. Moreover, if the control unit connected to the pressure sensor controls the pressurizing liquid in the test sample so as to pressurize in proportion to the pressurizing time, the container will be destroyed even if it deforms or creeps during the process. Until that time, the voltage can be boosted linearly at a predetermined ratio.

In the pressure resistance test apparatus of the present invention, the pressurizing device is connected to an air chamber, one of which is connected to a high pressure air source with an elastic diaphragm in the pressure tank, and the other is connected to a pressurizing liquid in a test sample. A transfer barrier type accumulator that divides the air chamber into a liquid chamber that converts the air pressure into a liquid pressure enables a large compression rate and a wide adjustment range for pressure changes, and converts the finely adjustable air pressure into a liquid pressure as is for testing. The sample can be pressurized and the air and liquid can be completely separated by the diaphragm, so that water does not enter the pressure sensor on the high-pressure air side and the air does not flow into the test sample such as a bottle. It can be stopped.

Further, according to the present invention, in the above apparatus, the air chamber of the transfer barrier type accumulator and the high pressure air source are connected via an electropneumatic proportional valve for controlling the air pressure in proportion to the voltage from the power source. Therefore, it is possible to easily and accurately control the pressurization state of the pressurizing device, for example, at a voltage of 0, a pressure of 0 (released to atmospheric pressure), and a voltage of 5 at a pressure of 5 kg / cm ² . Further, the present invention is, in the above device, between a power supply and an electropneumatic proportional valve,
Since it has a configuration in which a control unit for controlling the voltage from the power source and supplying it to the electropneumatic proportional valve based on the detected pressure signal that detects the air pressure of the accumulator is provided, the strength and weakness of the test sample such as the compression container, By controlling the voltage from the power supply and supplying it to the electropneumatic proportional valve according to the size, etc., for example, it is possible to control the test sample such as a bottle that easily causes creep when pressure is applied. It can be carried out.

[0012]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS The present invention will be described in detail with reference to the embodiments shown below. In the figure, reference numeral 1 is a thermostatic test tank for containing a containing liquid 2 whose temperature has been adjusted to a predetermined temperature, and which is immersed in the containing liquid. The temperature of the test sample 3 such as a bottle is controlled to be constant. Test sample 3 such as bottle in test tank 1
To prevent the contained liquid 2 from splashing around when the
And a test sample 3 such as a bottle under pressure resistance test is attached to the lid 4 or the test tank 1.
There is a window to observe the situation. As the containing liquid 2, it is optimal and preferable to use water because the temperature of the test sample 3 can be adjusted within a range of 5 to 80 ° C., for the sake of easy control.

Reference numeral 5 is a transfer barrier type accumulator which constitutes a pressurizing device for pressurizing the pressurizing liquid contained in the test sample 3. An elastic diaphragm made of synthetic resin, rubber or the like is provided in a pressure tank made of metal or the like. 6 is divided into an air chamber 7 connected to the high-pressure air source 10 and the other to a liquid chamber 8 connected to the pressurizing liquid in the test sample 3, and the controlled air pressure is converted into a liquid pressure. is there. In the case of the embodiment, the metal pressure tank contains the rubber diaphragm 6, the upper part contains the air, and the lower part contains the pressurizing liquid. By introducing the air pressure from the upper part, the pressurizing liquid in the tank is It is designed to apply pressure in the direction of extrusion. Further, the accumulator 5 is installed at a position lower than the water level of the test tank 1, and when the air pressure in the air chamber 7 is stopped without air pressure, the stored liquid 2 in the test tank 1 is used as a pressurizing liquid in the lower liquid chamber 8 due to the siphon effect. (Water) is supplied. Further, by using the accumulator 5, the air and water can be completely separated by the diaphragm 6, so that the invasion of water into the air chamber 7 side and the wraparound of air into the test sample 3 such as a bottle are prevented. You can

Reference numeral 9 denotes a pressurizing connecting pipe for connecting the accumulator 5 for pressurizing the pressurizing liquid in the test sample 3 and the test sample 3, and a bottle or the like at one end to be immersed in the test tank 1. While the opening of the test sample 3 is fitted integrally by screwing means or the like and the joint portion 11 to be connected is integrally provided, the multi-end portion is liquid-tightly connected to the liquid chamber 8 of the accumulator 5. A coupler 12 for facilitating replacement of the test sample 3 such as a bottle is provided in the middle of the pressurizing connection pipe body 9, and this coupler 12 is a joint inserted in the middle of the pipe to the test sample 3,
The pressurizing connection pipe body 9 can be divided. First, the test sample 3 such as a bottle filled with water is screwed into the joint portion 11 with the pipe body 9 separated from the coupler 12 and then inserted into the coupler 12 again. It is configured so that it can be fixed. In addition, the coupling portion of the coupler 12 has an automatic opening / closing type configuration in which the tube circuit is closed at the time of separation.
Air is prevented from entering the liquid chamber 8 below the accumulator 5 during connection.

Numeral 15 is an electropneumatic proportional valve provided in the middle of an air pipe circuit 13 connecting the air chamber 7 of the accumulator 5 and the high pressure air source 10, and the high pressure air source 1 received at the inlet side
The pressure of the air chamber 7 of the accumulator 5 as the pressurizing device, which is a kind of electromagnetic valve that controls the high pressure of 0 from the power supply 14 via the controller 16 to control the air pressure on the outlet side, That is, the pressure in the test sample 3 through the liquid chamber 8 side is, for example, 0 voltage at the controller 16 (pressure is released to atmospheric pressure), 5 voltage is 5 pressure.
It is constructed so that it can be controlled like kg / cm ² . Reference numeral 17 is a pressure sensor connected to the air pipe circuit 13 on the output side of the electropneumatic proportional valve 15, and as described above, the pressure inside the test sample 3 can be known by detecting the pressure on the output side of the electropneumatic proportional valve 15. The detected signal is fed back to the proportional air valve 15 to enable highly accurate control, and by outputting it to the display unit 18, the present pressure which changes momentarily and the resulting peak pressure are displayed and recorded. It is configured so that it can be done. In addition,
As the pressure sensor 17, as shown by a broken line 19 in the figure, the one built in the electropneumatic proportional valve 15 for feedback can be used as it is.

The controller 16 includes a pressure sensor 17
A control unit for controlling the voltage to be output to the electropneumatic proportional valve 15 based on the detection signal of is constructed, and in the case of the embodiment, in order to obtain the boosting at a constant speed, the voltage is maintained at a constant speed until the target pressure is reached. The pressure sensor 1 sets the pressure drop when the test sample 3 such as a bottle is broken so as to rise.
When detected in 7, the electropneumatic proportional valve 15 is stopped by comparison with a predetermined destruction level, and the outlet side is released to atmospheric pressure.
For example, if you set the target pressure 13 kg / cm ² and the breakdown level and pressure drop 0.2 kg / cm ² at break,
When the pressure was 12 kg / cm ² , the test sample 3 such as a bottle broke, and when the pressure dropped to 11.8 kg / cm ² , it was judged as “break” and the peak pressure was 12 kg / cm ^2.
Certify as the breaking pressure. If the test sample such as a bottle does not break even when the target pressure is reached, keep the pressure as it is and measure the time until it breaks. When the test sample 3 such as a bottle is broken, the peak pressure may be displayed on the display unit 18 as a peak display unit by a signal from the controller. Further, the controller 16 controls the size of the test sample such as a bottle,
Regardless of strength, for example, ^{2 to} 25 kg / cm ² · mi
n, a maximum of 25 kg / cm ² , such as a constant speed increase rate and a maximum target pressure can be set, and parts such as an intake manifold for an automobile,
It can also be used for testing tubes, pipes (including pipes with pinch-off parts), cans, bags, etc.

An example of the operating procedure of the above embodiment is as follows:
Water is filled in the test tank 1 as the contained liquid 2 and the temperature is adjusted to a predetermined temperature. Next, the accumulator 5 is installed at a position lower than the test tank 1, the test sample 3 such as a bottle is left unjoined, and the portion of the pressurizing connection pipe body 9 from the coupler 12 is inserted into the water of the test tank 1. Leave. Controller 1
6 is turned on, the release valve of the electropneumatic proportional valve 15 is opened at a voltage of 0, and the liquid chamber 8 of the accumulator 5 is also opened to the atmosphere, and the liquid chamber 8 of the accumulator 5 having a lower water level than the test tank 1 is placed in the test chamber 1. The water is supplied liquid-tight by the siphon effect. Next, the test sample 3 such as a test bottle is submerged in the tank, and water is poured through the opening. The part of the pressurizing connecting tube 9 from the coupler 12 is separated from the coupler with an automatic opening / closing valve, and care is taken not to let air enter the test sample 3 such as a bottle, and the joining portion 11 at the tip thereof is separated. Screw in test sample 3. Test sample 3 such as bottle
Then, the portion of the connection tube 9 for pressurization from the coupler 12 is inserted and fixed in the coupler 12. The test sample 3 such as a bottle is now connected to the pressure pipe. Next, the boosting speed of the controller 16, the target pressure, and the breakdown level are set. The test switch of the controller 16 is pressed to start boosting. The pressure rises, and the pressure inside the sample is momentarily displayed and recorded on the display unit 18 via the pressure sensor 17. When the test sample 3 such as a bottle is broken, the peak pressure at that time is displayed on the display unit 18 according to a command from the controller 16. Simultaneously with the destruction, the electropneumatic proportional valve 15 is stopped, the pressure is released to the atmosphere, and the air pressure in the air chamber 7 of the accumulator 5 decreases, so that the liquid chamber of the accumulator 15 is again supplied with water from the test tank 1. Become. Therefore, the pressure resistance test can be repeated by exchanging the test samples 3 such as bottles one after another according to the above procedure.

[0018]

According to the pressure resistance test method for a pressure vessel and the like of the present invention having the above-mentioned constitution, the stored liquid is stored in the test tank,
A test sample such as a pressure container that stores a pressurizing liquid is immersed in the contained liquid, the pressurizing liquid in the test sample is pressurized with time by a pressurizing device, and the pressurization state is detected with time. With this configuration, it is possible to detect a change in the applied pressure during the process of destruction, which has the effect of linearly increasing the pressure in the test sample at a constant rate according to the test conditions. .

The present invention also provides the above-mentioned test method,
By configuring the contained liquid and the pressurizing liquid with water or an aqueous solution, there is an effect that the management of the contained liquid and the pressurizing liquid and the temperature control can be facilitated, and the test tank can be easily made into a constant temperature bath at a predetermined temperature. . Further, in the present invention, in the above-mentioned test method, a pressurizing device for pressurizing the liquid in the test sample is installed at a position lower than the liquid level of the contained liquid in the test tank, and the pressurizing device for connecting the test sample and the pressurizing device is used. Since the connecting pipe is filled with the siphon-type containing liquid and the test sample immersed in the test tank and the pressurizing device are liquid-tightly connected by the pressurizing connecting pipe, the test sample such as a bottle is connected. When
There is an effect that the pressurizing connecting pipe can be easily filled with the pressurizing liquid and that air can easily be prevented from flowing into the pressurizing liquid.

Further, according to the pressure resistance test apparatus for a pressure vessel or the like according to the present invention, a test tank for accommodating the containing liquid at a predetermined temperature and immersing the test sample in the pressure vessel, and the pressurizing liquid in the test sample are pressurized. A pressurizing device, a connecting tube for pressurizing the test sample and the pressurizing device, a pressure sensor that detects the pressurizing pressure over time, and a display unit that is connected to the pressure sensor to display and record the pressurizing state. And a control unit that is connected to a pressure sensor and controls the pressurization state of the pressurizing device. For example, the pressurizing pressure of the test sample is detected with the pressure sensor over time and connected to the pressure sensor. It is possible to display and record the pressurization state on the display unit, and control the pressurizing liquid in the test sample to pressurize in proportion to the pressurizing time by the control unit connected to the pressure sensor. Et al., With or without the test sample and small and creep occurs, there is an effect that it is possible to increase the sample within the pressure linearly to destroy.

In the pressure resistance test apparatus of the present invention, the pressurizer is connected to an air chamber, one of which is connected to a high pressure air source with an elastic diaphragm in the pressure tank, and the other is connected to a pressurizing liquid in a test sample. A transfer barrier type accumulator that divides the air chamber into a liquid chamber that converts the air pressure into a liquid pressure enables a large compression rate and a wide adjustment range for pressure changes, and converts the finely adjustable air pressure into a liquid pressure as is for testing. The sample can be pressurized and the air and liquid can be completely separated by the diaphragm, so that water does not enter the pressure sensor on the high-pressure air side and the air does not flow into the test sample such as a bottle. There is an effect that can be stopped.

Further, according to the present invention, in the above apparatus, the air chamber of the transfer barrier type accumulator and the high pressure air source are connected via an electropneumatic proportional valve for controlling the air pressure in proportion to the voltage from the power source. Therefore, for example, at a voltage of 0, a pressure of 0 (released to atmospheric pressure), and a voltage of 5 at a pressure of 5 kg / cm ² , it is possible to easily and accurately control the pressurization state of the pressurizing device. is there.

In the present invention, the electropneumatic proportional valve is controlled by controlling the voltage from the power source between the power source and the electropneumatic proportional valve on the basis of a detected pressure signal detecting the air pressure of the accumulator in the device. Since it has a configuration in which a control unit for supplying to the electro-pneumatic proportional valve is provided, the voltage from the power source is controlled and supplied to the electropneumatic proportional valve in accordance with the strength and weakness of the test sample such as the compression container and the size of the capacity. As for a test sample such as a bottle which is apt to cause a creep when a pressure is applied, it is possible to perform control in consideration of the amount.

[Brief description of drawings]

FIG. 1 is a schematic explanatory view showing in principle an embodiment of a pressure resistance test method for a pressure vessel and the like and an apparatus therefor according to the present invention.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Test tank 2 Storage liquid 3 Test sample 4 Lid body 5 Transfer barrier type accumulator 6 Elastic diaphragm 7 Air chamber 8 Liquid chamber 9 Pressurizing connecting pipe body 10 High pressure air source 11 Joint part 12 Coupler 13 Air tube circuit 14 Power supply 15 Electropneumatic Proportional valve 16 Controller 17 Pressure sensor 18 Display 19 Broken line

 ─────────────────────────────────────────────────── ─── Continuation of the front page (72) Inventor Yoji Tanaka 5-15-4 Takinogawa, Kita-ku, Tokyo Toyo Seiki Co., Ltd.

Claims (7)

[Claims] 1. A test tank such as a pressure vessel for containing a liquid for pressurization is immersed in the liquid to be stored in a test tank, and the liquid for pressurization in the test sample is aged with a pressurizing device. Pressure test method for a pressure vessel or the like, in which the pressure is boosted automatically and the boosted state is detected over time. 2. A pressure resistance test method for a pressure vessel and the like according to claim 1, wherein the containing liquid and the pressurizing liquid are composed of water or an aqueous solution. 3. The method according to claim 1 or 2, wherein
A pressurizing device that pressurizes the liquid in the test sample is installed at a position lower than the liquid level of the contained liquid in the test tank, and the siphon-type filled liquid is filled in the pressurizing connecting pipe that connects the test sample and the pressurizing device. A pressure resistance test method for a pressure container or the like, characterized in that a test sample immersed in a test tank and a pressurizing device are liquid-tightly connected by the pressurizing connecting pipe body. 4. A test tank for accommodating a test liquid, such as a pressure vessel, containing a liquid at a predetermined temperature, a pressurizing device for pressurizing the pressurizing liquid in the test sample, and the test sample and the pressurizing device are connected. Pressurizing connection pipe body, pressure sensor that detects the pressurizing pressure over time, display unit that is connected to the pressure sensor to display and record the pressurizing state, and pressurizing state of the pressurizing device that is connected to the pressure sensor. A pressure tester for pressure vessels, etc. that consists of a control unit that controls. 5. The apparatus according to claim 4, wherein the pressurizing device is an air chamber whose inside is connected to a high pressure air source with an elastic diaphragm in the pressure tank, and the other is connected to the pressurizing liquid in the test sample. A pressure resistance test device for a pressure vessel or the like, which is composed of a transfer barrier type accumulator that is divided into chambers and converts air pressure into liquid pressure. 6. The apparatus according to claim 5, wherein the air chamber of the transfer barrier type accumulator and a high-pressure air source are connected via an electropneumatic proportional valve that controls the air pressure in proportion to the voltage from the power source, A pressure resistance test device for a pressure vessel or the like characterized by controlling the pressurization state of the pressurization device. 7. The apparatus according to claim 6, wherein the voltage from the power supply is controlled between the power supply and the electropneumatic proportional valve on the basis of a detected pressure signal detecting the air pressure of the accumulator. A pressure resistance test device for a pressure vessel or the like, which is provided with a control unit for supplying to a valve.