CN116067587A - Inner container air tightness detection method and device - Google Patents

Inner container air tightness detection method and device Download PDF

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Publication number
CN116067587A
CN116067587A CN202111271665.2A CN202111271665A CN116067587A CN 116067587 A CN116067587 A CN 116067587A CN 202111271665 A CN202111271665 A CN 202111271665A CN 116067587 A CN116067587 A CN 116067587A
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China
Prior art keywords
inner container
liner
air pressure
inlet
pressure value
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CN202111271665.2A
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Chinese (zh)
Inventor
孙鹏
王冬阳
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Weishi Energy Technology Co Ltd
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Weishi Energy Technology Co Ltd
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Priority to CN202111271665.2A priority Critical patent/CN116067587A/en
Publication of CN116067587A publication Critical patent/CN116067587A/en
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    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01M—TESTING STATIC OR DYNAMIC BALANCE OF MACHINES OR STRUCTURES; TESTING OF STRUCTURES OR APPARATUS, NOT OTHERWISE PROVIDED FOR
    • G01M3/00—Investigating fluid-tightness of structures
    • G01M3/02—Investigating fluid-tightness of structures by using fluid or vacuum
    • G01M3/26—Investigating fluid-tightness of structures by using fluid or vacuum by measuring rate of loss or gain of fluid, e.g. by pressure-responsive devices, by flow detectors
    • G01M3/32—Investigating fluid-tightness of structures by using fluid or vacuum by measuring rate of loss or gain of fluid, e.g. by pressure-responsive devices, by flow detectors for containers, e.g. radiators
    • G01M3/3236—Investigating fluid-tightness of structures by using fluid or vacuum by measuring rate of loss or gain of fluid, e.g. by pressure-responsive devices, by flow detectors for containers, e.g. radiators by monitoring the interior space of the containers
    • G01M3/3272—Investigating fluid-tightness of structures by using fluid or vacuum by measuring rate of loss or gain of fluid, e.g. by pressure-responsive devices, by flow detectors for containers, e.g. radiators by monitoring the interior space of the containers for verifying the internal pressure of closed containers
    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01M—TESTING STATIC OR DYNAMIC BALANCE OF MACHINES OR STRUCTURES; TESTING OF STRUCTURES OR APPARATUS, NOT OTHERWISE PROVIDED FOR
    • G01M3/00—Investigating fluid-tightness of structures
    • G01M3/02—Investigating fluid-tightness of structures by using fluid or vacuum
    • G01M3/04—Investigating fluid-tightness of structures by using fluid or vacuum by detecting the presence of fluid at the leakage point
    • G01M3/20—Investigating fluid-tightness of structures by using fluid or vacuum by detecting the presence of fluid at the leakage point using special tracer materials, e.g. dye, fluorescent material, radioactive material
    • G01M3/22—Investigating fluid-tightness of structures by using fluid or vacuum by detecting the presence of fluid at the leakage point using special tracer materials, e.g. dye, fluorescent material, radioactive material for pipes, cables or tubes; for pipe joints or seals; for valves; for welds; for containers, e.g. radiators
    • G01M3/226—Investigating fluid-tightness of structures by using fluid or vacuum by detecting the presence of fluid at the leakage point using special tracer materials, e.g. dye, fluorescent material, radioactive material for pipes, cables or tubes; for pipe joints or seals; for valves; for welds; for containers, e.g. radiators for containers, e.g. radiators
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
    • Y02E60/00—Enabling technologies; Technologies with a potential or indirect contribution to GHG emissions mitigation
    • Y02E60/30—Hydrogen technology
    • Y02E60/32—Hydrogen storage

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  • Physics & Mathematics (AREA)
  • General Physics & Mathematics (AREA)
  • Filling Or Discharging Of Gas Storage Vessels (AREA)

Abstract

The application discloses a method and a device for detecting the tightness of a liner, wherein the method for detecting the tightness of the liner comprises the following steps: inflating the inner container through a first inlet of the inner container, and closing the first inlet of the inner container after the air pressure in the inner container reaches a first air pressure value; detecting a second air pressure value of the inner container after a first inlet of the inner container is closed for a preset time, and determining the air tightness of the inner container according to the first air pressure value and the second air pressure value; or coating leakage detection liquid on the surface of the liner, and determining the air tightness of the liner according to the state of the leakage detection liquid. According to the embodiment of the application, the inner container is inflated, the first inlet of the inner container is sealed after the air pressure value in the inner container reaches the first air pressure value, the second air pressure value of the inner container is detected after the air pressure value in the inner container is preset, the air tightness of the inner container is determined according to the first air pressure value and the second air pressure value, or the leakage detection liquid is smeared on the surface of the inner container, the air tightness of the inner container is determined according to the state of the leakage detection liquid, and therefore the detection of the air tightness of the inner container is completed rapidly.

Description

Inner container air tightness detection method and device
Technical Field
The application relates to the technical field of hydrogen storage containers, in particular to a method and a device for detecting tightness of a liner.
Background
With the development of fuel cell automobile technology, hydrogen storage cylinders for storing hydrogen gas are also becoming more and more important. The nonmetal liner fiber fully-wound gas cylinder has the advantages of lighter weight, lower cost and higher mass hydrogen storage density, and is increasingly widely applied. In order to prevent the hydrogen gas from leaking from the hydrogen storage cylinder, the air tightness of the hydrogen storage cylinder is usually detected.
However, at present, the whole air tightness of the hydrogen storage cylinder is generally detected, if the leakage condition of the hydrogen storage cylinder is detected, whether the air tightness of the liner of the hydrogen storage cylinder is invalid cannot be judged, so that the whole air tightness of the hydrogen storage cylinder is invalid, and a large amount of cost is wasted.
Disclosure of Invention
The embodiment of the application provides a method and a device for detecting the tightness of a liner, and aims to solve the problems that under the condition that the tightness of a hydrogen storage cylinder is detected to fail, whether the tightness of the liner of the hydrogen storage cylinder fails or not cannot be judged, so that the tightness of the whole hydrogen storage cylinder fails, and a large amount of cost is wasted.
The embodiment of the application provides a method for detecting the air tightness of a liner, which comprises the following steps:
inflating the inner container through a first inlet of the inner container, and closing the first inlet of the inner container after the air pressure in the inner container reaches a first air pressure value;
Detecting a second air pressure value of the inner container after a first inlet of the inner container is closed for a preset time, and determining the air tightness of the inner container according to the first air pressure value and the second air pressure value; or alternatively, the process may be performed,
and coating leakage detection liquid on the surface of the liner, and determining the air tightness of the liner according to the state of the leakage detection liquid.
Optionally, the determining the air tightness of the liner according to the first air pressure value and the second air pressure value includes:
calculating a difference between the first air pressure value and the second air pressure value;
comparing the difference value of the first air pressure value and the second air pressure value with a preset threshold value;
and if the difference value between the first air pressure value and the second air pressure value is smaller than or equal to the preset threshold value, determining that the liner is not air-leaked.
Optionally, the method further comprises:
if the difference value between the first air pressure value and the second air pressure value is larger than the preset threshold value, coating leakage detection liquid on the surface of the liner;
acquiring the position of the leak detection liquid where bubbles are generated;
and determining the position of the air leakage of the liner according to the position of the air bubble generated by the leakage detection liquid.
Optionally, the inflating the inner container through the first inlet of the inner container, and closing the first inlet of the inner container after the air pressure in the inner container reaches the first air pressure value, includes:
Connecting a first sealing valve with and sealing the first inlet of the inner container, wherein the first sealing valve is provided with a channel communicated with the first inlet of the inner container;
and inflating the inner container through the channel, and closing the channel after the air pressure in the inner container reaches a first air pressure value so as to close the first inlet of the inner container.
Optionally, the inner container is provided with a first end and a second end which are opposite, a first interface part is convexly arranged on the surface of the first end of the inner container, and the first inlet is positioned at the free end of the first interface part; a first jack for the first interface part to be inserted is formed in one side of the first sealing valve, and the channel is formed in the bottom surface of the first jack; the first sealing valve is connected with the first inlet of the inner container and seals the first inlet of the inner container, and the sealing valve comprises:
inserting a first interface part of the liner into the first jack so that a first inlet of the first interface part is communicated with the channel on the bottom surface of the first jack;
and applying a thrust force towards the first end to the second end of the inner container, so that the outer surface of the first end of the inner container is tightly attached to the surface of the first sealing valve, and the first inlet of the inner container is sealed.
Optionally, the second end of the inner container is provided with a second inlet, the second end of the inner container is applied with a thrust towards the first end, so that the outer surface of the first end of the inner container is tightly attached to the surface of the first sealing valve, and the sealing device is used for sealing the first inlet of the inner container and comprises:
connecting a second sealing valve with a second inlet of the inner container and sealing the second inlet of the inner container;
and applying a thrust force towards the first end to the second sealing valve, so that the outer surface of the first end of the inner container is tightly attached to the surface of the first sealing valve to seal the first inlet of the inner container, and the outer surface of the second end of the inner container is tightly attached to the surface of the second sealing valve to seal the second inlet of the inner container.
Optionally, the channel communicates with a pressure sensor; the channel is communicated with the air charging pipeline through a first valve; the said air inflation to the said inner container through the said channel, and close the said channel after the air pressure in the said inner container reaches the first air pressure value, including:
inflating the channel through the inflation line to inflate the liner;
acquiring the air pressure value of the pressure sensor in real time;
And closing the first valve after the air pressure value of the pressure sensor reaches the first air pressure value so as to close the channel.
Optionally, the detecting the second air pressure value of the inner container after the preset time includes:
and acquiring the air pressure value of the pressure sensor after closing the first inlet of the inner container for a preset time so as to detect the second air pressure value of the inner container.
Optionally, the channel is communicated with the outside through a second valve, and after the air tightness of the liner is determined according to the first air pressure value and the second air pressure value, or after the air tightness of the liner is determined according to the state of the leakage detection liquid, the method further comprises:
and opening the second valve to discharge the gas in the inner container to the outside.
The embodiment of the application also provides a device for detecting the tightness of the inner container, which comprises:
a liner support;
the first sealing valve is arranged on the liner bracket, is used for being connected with the first inlet of the liner and sealing the first inlet of the liner, and is provided with a channel for communicating with the first inlet;
a pressure sensor in communication with the channel;
and the output end of the first valve is communicated with the first inlet.
According to the inner container air tightness detection method, the inner container is inflated, the first inlet of the inner container is closed after the air pressure value in the inner container reaches the first air pressure value, the second air pressure value of the inner container is detected after the first inlet of the inner container is closed for the preset time, the air tightness of the inner container is determined according to the first air pressure value and the second air pressure value, or the leakage detection liquid is smeared on the surface of the inner container, the air tightness of the inner container is determined according to the state of the leakage detection liquid, and therefore the inner container air tightness detection is completed rapidly. When the air tightness of the inner container can not meet the requirement, the inner container can be scrapped or repaired again, and the inner container winding layer, the valve seat sealing structure and the like with the air tightness which are not in accordance with the requirement can not be assembled to form the hydrogen storage cylinder, so that the problem that the air tightness of the inner container of the hydrogen storage cylinder is invalid under the condition that the air tightness of the hydrogen storage cylinder is invalid is avoided, the air tightness of the whole hydrogen storage cylinder is invalid, and a large amount of cost is wasted is caused.
Drawings
Technical solutions and other advantageous effects of the present application will be made apparent from the following detailed description of specific embodiments of the present application with reference to the accompanying drawings.
Fig. 1 is a flowchart of an embodiment of a method for detecting the air tightness of a liner according to an embodiment of the present application;
fig. 2 is a flowchart of another embodiment of a method for detecting the air tightness of a liner according to an embodiment of the present application;
fig. 3 is a schematic structural diagram of an embodiment of a liner air tightness detection device according to an embodiment of the present application;
FIG. 4 is a partial cross-sectional view of a first sealing valve according to an embodiment of the present disclosure after mating with a liner, the cross-sectional view being taken along the length of the channel;
FIG. 5 is a partial cross-sectional view of a second sealing valve according to an embodiment of the present disclosure after being mated with a liner, the cross-sectional view being taken along a length direction of the liner;
fig. 6 is a schematic diagram of an installation structure of a liner and a liner air tightness detection device provided in an embodiment of the present application.
An inner container 200; a first end 201; a second end 202; a first interface portion 210; a first inlet 220; a second interface part 230; a second inlet 240; a liner air tightness detecting device 300; a first sealing valve 310; a first jack 311; a channel 312; a liner support 320; a second sealing valve 321; a second jack 322; a support base 323; a pushing assembly 330; a pushing member 331; a drive structure 332; a control valve 333; a cylinder barrel 334; a pressure sensor 340; a first valve 350; a second valve 360; a first air pressure regulating valve 370; a second air pressure regulating valve 380; a gas line 390.
Detailed Description
The technical solutions in the embodiments of the present application will be clearly and completely described below with reference to the drawings in the embodiments of the present application. It will be apparent that the described embodiments are only some, but not all, of the embodiments of the present application. All other embodiments, which can be made by those skilled in the art based on the embodiments herein without making any inventive effort, are intended to be within the scope of the present application.
In the description of the present application, it should be understood that the terms "center," "longitudinal," "transverse," "length," "width," "thickness," "upper," "lower," "front," "rear," "left," "right," "vertical," "horizontal," "top," "bottom," "inner," "outer," "clockwise," "counterclockwise," etc. indicate or are based on the orientation or positional relationship shown in the drawings, merely for convenience of description and to simplify the description, and do not indicate or imply that the devices or elements referred to must have a specific orientation, be configured and operated in a specific orientation, and thus should not be construed as limiting the present application. Furthermore, the terms "first," "second," and the like, are used for descriptive purposes only and are not to be construed as indicating or implying a relative importance or implicitly indicating the number of technical features indicated. Thus, a feature defining "a first" or "a second" may explicitly or implicitly include one or more of the described features. In the description of the present application, the meaning of "a plurality" is two or more, unless explicitly defined otherwise.
In the description of the present application, it should be noted that, unless explicitly specified and limited otherwise, the terms "mounted," "connected," and "connected" are to be construed broadly, and may be either fixedly connected, detachably connected, or integrally connected, for example; can be mechanically connected, electrically connected or can be communicated with each other; can be directly connected or indirectly connected through an intermediate medium, and can be communicated with the inside of two elements or the interaction relationship of the two elements. The specific meaning of the terms in this application will be understood by those of ordinary skill in the art as the case may be.
In this application, unless expressly stated or limited otherwise, a first feature "above" or "below" a second feature may include both the first and second features being in direct contact, and may also include the first and second features not being in direct contact but being in contact with each other by way of additional features therebetween. Moreover, a first feature being "above," "over" and "on" a second feature includes the first feature being directly above and obliquely above the second feature, or simply indicating that the first feature is higher in level than the second feature. The first feature being "under", "below" and "beneath" the second feature includes the first feature being directly under and obliquely below the second feature, or simply means that the first feature is less level than the second feature.
The following disclosure provides many different embodiments or examples for implementing different structures of the present application. In order to simplify the disclosure of the present application, the components and arrangements of specific examples are described below. Of course, they are merely examples and are not intended to limit the present application. Furthermore, the present application may repeat reference numerals and/or letters in the various examples, which are for the purpose of brevity and clarity, and which do not in themselves indicate the relationship between the various embodiments and/or arrangements discussed. In addition, the present application provides examples of various specific processes and materials, but one of ordinary skill in the art may recognize the application of other processes and/or the use of other materials.
The embodiment of the application provides a method and a device for detecting the air tightness of a liner. The following will describe in detail.
First, the embodiment of the application provides a method for detecting the air tightness of a liner.
Fig. 1 is a flowchart of an embodiment of a method for detecting the air tightness of a liner according to an embodiment of the present application. As shown in fig. 1, the method for detecting the air tightness of the inner container in the embodiment of the present application includes a step 110 and a step 120, and is described in detail as follows:
S110, inflating the inner container through a first inlet of the inner container, and closing the first inlet of the inner container after the air pressure in the inner container reaches a first air pressure value.
As shown in fig. 4, the inner container 200 has a first inlet 220, and when the air pressure in the inner container 200 reaches a first air pressure value by inflating the inner container 200, the first inlet 220 of the inner container 200 is closed, so that the air in the inner container 200 cannot leak out from the first inlet 220 of the inner container 200.
Wherein the first air pressure value may be set to 3-4bar, depending on the material of the inner container 200. Of course, the first air pressure value may also be determined according to the usage environment of the liner 200. For example: when the liner 200 is used normally, the maximum air pressure value in the liner is the third air pressure value, so that the first air pressure value is greater than or equal to the third air pressure value, and the liner 200 which is qualified in detection has good air tightness in normal use.
Optionally, the process of inflating the inner container through the first inlet of the inner container and closing the first inlet of the inner container after the air pressure in the inner container reaches the first air pressure value may include the following steps:
1101. the first sealing valve is connected with the first inlet of the inner container and seals the first inlet of the inner container, and the first sealing valve is provided with a channel communicated with the first inlet of the inner container.
1102. And (3) inflating the inner container through the channel, and closing the channel after the air pressure in the inner container reaches a first air pressure value so as to close the first inlet of the inner container.
As shown in fig. 4, the first sealing valve 310 has a passage 312, and the bladder 200 is inflated by connecting the first sealing valve 310 with the first inlet 220 of the bladder 200 such that the first sealing valve 310 seals the first inlet 220 of the bladder 200 and the passage 312 of the first sealing valve 310 communicates with the first inlet 220 of the bladder 200, and then by communicating an inflation line 390 for inflating the first inlet 220 of the bladder 200 with the passage 312 of the first sealing valve 310. Moreover, after the air pressure in the inner container 200 reaches the first air pressure value, the first inlet 220 of the inner container 200 can be closed by closing the channel 312 of the first sealing valve 310, so that the air in the inner container 200 can be prevented from leaking out from the first inlet 220 of the inner container 200, and the operation is very convenient.
Specifically, as shown in fig. 4, the liner 200 has opposite first and second ends 201, 202, and the first inlet 220 of the liner 200 is located at the first end 201 of the liner 200. The surface of the first end 201 of the liner 200 is convexly provided with a first interface 210, and the first inlet 220 is located at the free end of the first interface 210. A first insertion hole 311 into which the first interface 210 is inserted is opened at one side of the first sealing valve 310, and a passage 312 is opened at the other side of the first sealing valve 310, and the passage 312 communicates with the first insertion hole 311.
The method for connecting the first sealing valve with the first inlet of the inner container and sealing the first inlet of the inner container can comprise the following steps:
1101a, inserting the first interface portion of the liner into the first jack, so that the first inlet of the first interface portion is communicated with the channel on the bottom surface of the first jack.
It can be appreciated that by inserting the first interface 210 of the liner 200 into the first insertion hole 311 of the first sealing valve 310, the first sealing valve 310 can seal the first inlet 220 of the liner 200, and simultaneously, the channel 312 of the first sealing valve 310 is communicated with the first inlet 220 of the liner 200, so that the operation is very convenient.
The first insertion hole 311 is in interference fit with the first interface portion 210, so that the outer peripheral surface of the first interface portion 210 is closely attached to the inner peripheral surface of the first insertion hole 311, thereby further improving the sealing effect of the first sealing valve 310 on the first inlet 220 on the first interface portion 210. The cross-sectional shape of the first insertion hole 311 may be circular, rectangular, etc., and may be specifically determined according to the radial cross-sectional shape of the first interface portion 210.
The method for connecting the first sealing valve with the first inlet of the inner container and sealing the first inlet of the inner container may further include the following steps:
1101b, applying a pushing force to the second end of the inner container towards the first end, so that the outer surface of the first end of the inner container is tightly attached to the surface of the first sealing valve, and the first inlet of the inner container is sealed.
By applying a pushing force to the second end 202 of the liner 200 toward the first end 201, the outer surface of the liner 200 at the first end 201 is brought into close contact with the surface of the first sealing valve 310, and the sealing effect of the first sealing valve 310 on the first inlet 220 of the liner 200 can be further improved.
Meanwhile, when the air pressure of the air in the liner 200 is high after the liner 200 is inflated, a pushing force is applied to the first sealing valve 310, so that the first sealing valve 310 is separated from the first interface 210 of the liner 200. In the embodiment of the present application, by applying the pushing force toward the first end 201 to the second end 202 of the liner 200, the pressure between the first interface 210 and the first sealing valve 310 of the liner 200 can be increased, and the first sealing valve 310 is prevented from being separated from the first interface 210 of the liner 200.
Optionally, as shown in fig. 5, the second end 202 of the liner 200 is provided with a second inlet 240. The method for applying the thrust force to the second end of the liner toward the first end to make the outer surface of the first end of the liner closely contact with the surface of the first sealing valve so as to seal the first inlet of the liner may include the following steps:
1101b1, connecting the second sealing valve with the second inlet of the inner container and sealing the second inlet of the inner container.
The second port portion 230 is protruding on the surface of the second end 202 of the liner 200, the second inlet 240 is located at the free end of the second port portion 230, a second insertion hole 322 into which the second port portion 230 is inserted is formed at one side of the second sealing valve 321, and the second sealing valve 321 is connected to the second inlet 240 of the liner 200 and seals the second inlet 240 of the liner 200 by inserting the second port portion 230 of the liner 200 into the second insertion hole 322. Alternatively, the second sealing valve 321 may be inserted into the second inlet 240 to seal the second inlet 240.
1101b2, applying a thrust force to the second sealing valve towards the first end, so that the outer surface of the first end of the liner is tightly attached to the surface of the first sealing valve to seal the first inlet of the liner, and the outer surface of the second end of the liner is tightly attached to the surface of the second sealing valve to seal the second inlet of the liner.
By applying the thrust towards the first end 201 to the second sealing valve 321, the embodiment of the present disclosure can make the outer surface of the second end 202 of the liner 200 tightly contact the surface of the second sealing valve 321, so as to improve the sealing effect between the second sealing valve 321 and the second inlet 240 of the liner 200. At the same time, the sealing effect of the first sealing valve 310 against the first inlet 220 of the liner 200 can also be increased. Wherein, a pushing force may be applied to the support seat 323 on the liner support 320 for supporting the second sealing valve 321, so as to indirectly apply a pushing force to the second sealing valve 321 toward the first end 201. Alternatively, the second sealing valve 321 may be directly urged toward the first end 201.
Specifically, as shown in fig. 3 and 4, the first sealing valve 310 is connected to the first inlet 220 of the liner 200 and seals the first inlet 220 of the liner 200. The second sealing valve 321 is connected to the second inlet 240 of the liner 200 and seals the second inlet 240. The first sealing valve 310 and the second sealing valve 321 are provided on the liner support frame 320. The second sealing valve 321 is slidably connected to the liner support frame 320 through a support base 323 such that the second sealing valve 321 is close to or far from the first sealing valve 310. The liner support 320 is provided with a pushing component 330, the pushing component 330 is located at one side of the first sealing valve 310 along the direction from the first end 201 to the second end 202 of the liner 200, the pushing component 330 comprises a pushing piece 331 and a driving structure 332, the driving structure 332 is mounted on the liner support 320, and the driving structure 332 is connected with the pushing piece 331 to drive the pushing piece 331 to be close to or far away from the first sealing valve 310. The driving structure 332 drives the pushing member 331 to approach the first sealing valve 310, so that the pushing member 331 abuts against the supporting seat 323 of the second sealing valve 321, and thus thrust is applied to the second sealing valve 321, the outer surface of the liner 200 at the first interface 210 is abutted against the surface of the first sealing valve 310, and the outer surface of the second end 202 of the liner 200 is abutted against the surface of the second sealing valve 321. Alternatively, the pushing member 331 may be directly abutted against the first end 201 of the liner 200, and a pushing force may be applied to the liner 200, so that the outer surface of the liner 200 at the first interface 210 may be abutted against the surface of the first sealing valve 310.
The driving structure 332 includes a control valve 333 and a cylinder barrel 334 mounted on the liner support 320, and the pushing member 331 is a piston rod slidably mounted in the cylinder barrel 334, where the control valve 333 communicates with the cylinder barrel 334 to control a sliding direction of the piston rod, so that the piston rod is close to or far from the first sealing valve 310.
In other embodiments, the pushing force may not be applied to the end of the liner 200 away from the first interface 210. For example: the fixing portion may be provided on the liner 200, and the connection structure may be provided on the first sealing valve 310, so that when the first interface 210 of the liner 200 is inserted into the first insertion hole 311, the first inlet 220 of the first interface 210 is communicated with the channel 312 at the bottom surface of the first insertion hole 311, and then the connection structure on the first sealing valve 310 may be connected with the fixing portion on the liner 200, so as to prevent the first sealing valve 310 from being separated from the first interface 210 of the liner 200.
As shown in fig. 6, the passage 312 of the first sealing valve 310 communicates with the pressure sensor 340. The pressure sensor 340 can detect the air pressure value in the liner 200. The passage 312 of the first sealing valve 310 communicates with the inflation line 390 via the first valve 350. When the first valve 350 is opened, the air-charging pipeline 390 is communicated with the first inlet 220 of the liner 200 through the first valve 350 and the channel 312 in sequence to charge air into the liner 200; when the first valve 350 is closed, the passage 312 of the first sealing valve 310 can be closed, preventing the gas in the liner 200 from leaking out of the passage 312.
The process of inflating the inner container through the channel and closing the channel after the air pressure in the inner container reaches the first air pressure value specifically comprises the following steps:
1102a, and inflating the channel through an inflation line to inflate the bladder.
1102b, acquiring the air pressure value of the pressure sensor in real time.
1102c, closing the first valve after the air pressure value of the pressure sensor reaches the first air pressure value to close the channel 312.
Wherein, the air charging pipeline 390 can be connected with an air pump (not shown in the figure), and the air is charged into the air charging pipeline 390 through the air pump, so as to charge the liner 200. Alternatively, the air supply line 390 may be connected to an external air supply line, and the air supply line 390 may be inflated by the external air supply line to inflate the liner 200. In the process of inflating the liner 200, the pressure value in the liner 200 can be obtained in real time by obtaining the pressure value of the pressure sensor 340 in real time. When the air pressure value of the pressure sensor 340 reaches the first air pressure value, it is indicated that the air pressure value of the liner 200 has reached the first air pressure value, at this time, the first valve 350 is closed to close the channel 312, so as to prevent the air in the liner 200 from leaking out of the channel 312.
S120, detecting a second air pressure value of the inner container after the first inlet of the inner container is closed for a preset time, and determining the air tightness of the inner container according to the first air pressure value and the second air pressure value.
According to the embodiment of the application, the inner container 200 is inflated, the first inlet 220 of the inner container 200 is sealed after the air pressure value in the inner container 200 reaches the first air pressure value, the second air pressure value of the inner container 200 is detected after the first inlet 220 of the inner container 200 is sealed in a preset mode, the air tightness of the inner container 200 is determined according to the first air pressure value and the second air pressure value, and therefore the air tightness of the inner container 200 is detected rapidly.
When the air tightness of the liner 200 cannot meet the requirement, the liner 200 can be scrapped or repaired again, and the liner 200 winding layer, the valve seat sealing structure and the like with the air tightness which are not in accordance with the requirement can not be assembled to form the hydrogen storage cylinder, so that the problem that a large amount of cost is wasted because whether the air tightness of the liner 200 of the hydrogen storage cylinder fails can not be judged under the condition that the air tightness of the hydrogen storage cylinder fails is avoided.
The preset time may be determined according to the air tightness requirement of the band detecting liner 200. For example: when the air tightness of the inner container 200 is required to be high, the preset time may be 1 minute, 3 minutes, 5 minutes or more, and when the air tightness of the inner container 200 is required to be normal, the preset time may be 40 seconds, 30 seconds or less, which is not limited.
Wherein, the process of determining the air tightness of the inner container according to the first air pressure value and the second air pressure value may include the steps of:
1201. a difference between the first air pressure value and the second air pressure value is calculated.
1202. And comparing the difference value of the first air pressure value and the second air pressure value with a preset threshold value.
1203. If the difference value between the first air pressure value and the second air pressure value is smaller than or equal to a preset threshold value, the fact that the inner container is not leaked is determined.
It can be appreciated that if the air tightness of the liner 200 is poor and there is an air leakage, the air pressure value of the liner 200 will decrease after the preset time, that is, the second air pressure value will be smaller than the first air pressure value. According to the method and the device, the difference value of the first air pressure value and the second air pressure value is calculated and compared with the preset threshold value, if the difference value of the first air pressure value and the second air pressure value is smaller than or equal to the preset threshold value, the air tightness of the liner 200 is good, the liner 200 is not air-tight, and at the moment, the air tightness detection of the liner 200 is completed.
The preset threshold value can be determined according to practical situations. For example: when the air tightness requirement of the liner 200 is high, the preset threshold value may be set to a smaller value, and even, the preset threshold value may be set to 0. When the air tightness requirement of the liner 200 is general, the preset threshold value may be set to a large value.
Optionally, the step of detecting the second air pressure value of the liner after closing the first inlet of the liner for a preset time includes: and acquiring the air pressure value of the pressure sensor after the first inlet of the inner container is closed for a preset time so as to detect the second air pressure value of the inner container. It can be appreciated that, since the pressure sensor 340 is communicated with the liner 200, the air pressure value of the pressure sensor 340 after the preset time is the second air pressure value of the liner 200 after the preset time.
In other embodiments, the process of determining the air tightness of the liner according to the first air pressure value and the second air pressure value may include the steps of:
1211. a ratio of the first air pressure value to the second air pressure value is calculated.
1212. And comparing the ratio of the first air pressure value to the second air pressure value with a preset ratio.
1213. If the ratio of the first air pressure value to the second air pressure value is smaller than or equal to the preset ratio, the fact that the liner is not air-leaked is determined.
It can be appreciated that if the air tightness of the liner 200 is poor and there is an air leakage, the air pressure value of the liner 200 will decrease after the preset time, that is, the second air pressure value will be smaller than the first air pressure value. According to the embodiment of the application, the ratio of the first air pressure value to the second air pressure value is calculated and compared with the preset ratio, if the ratio of the first air pressure value to the second air pressure value is smaller than or equal to the preset ratio, the air tightness of the liner 200 is good, the liner 200 is not air-tight, and at the moment, the air tightness detection of the liner 200 is completed.
In other embodiments, the pressure sensor 340 may also be in communication with the second inlet 240 of the liner 200 to detect the air pressure within the liner 200.
In the embodiment of the present application, the method for detecting the air tightness of the inner container may further include the following steps:
1204. if the difference value between the first air pressure value and the second air pressure value is larger than a preset threshold value, coating leakage detection liquid on the surface of the liner.
1205. And acquiring the position of the leak detection liquid where bubbles are generated.
1206. And determining the position of the air leakage of the liner according to the position of the air bubble generated by the leakage detection liquid.
When the difference between the first air pressure value and the second air pressure value is greater than the preset threshold value, it is indicated that the air leakage condition exists in the liner 200, and after the leakage detection liquid is smeared on the surface of the liner 200, the leakage detection liquid can generate air bubbles at the air leakage position of the liner 200. Therefore, the position of the leakage of liner 200 can be determined based on the position of the leakage detection liquid where the bubbles are generated.
Wherein, leak detection liquid can be smeared at the welding line of the liner 200 and/or at the joint of the liner 200 and the first sealing valve 310. It can be appreciated that the probability of occurrence of air leakage at the weld of the liner 200 and the connection of the liner 200 and the first sealing valve 310 is high, and the application area of the leakage detection liquid can be reduced and the efficiency of determining the air leakage position of the liner 200 can be improved by applying the leakage detection liquid at the weld of the liner 200 and/or the connection of the liner 200 and the first sealing valve 310.
Of course, the leak detection liquid may be applied to all surfaces of the liner 200, or may be applied to other positions of the liner 200.
In other embodiments, as shown in fig. 2, the method for detecting the air tightness of the inner container includes a step 110 and a step 130, wherein the step 110 may refer to the step 110, and will not be described herein. The detailed description of step 130 is as follows:
s130, coating leakage detection liquid on the surface of the liner, and determining the air tightness of the liner according to the state of the leakage detection liquid.
In this embodiment, when the liner 200 is inflated, after the air pressure value in the liner 200 reaches the first air pressure value and the first inlet 220 of the liner 200 is closed, the leak detection liquid is smeared on the surface of the liner 200. When the air tightness of the liner 200 is poor and an air leakage condition exists, the leaked air can change the state of the leakage detection liquid, so that the air tightness of the liner 200 is determined according to the state of the leakage detection liquid.
The state of the leak detection liquid comprises bubble generation, color change and the like, and is specifically as follows:
in some embodiments, the process of determining the air tightness of the liner according to the state of the leakage detection liquid may include the following steps:
1301. judging whether the leak detection liquid generates bubbles within a preset time.
1302. If not, determining that the liner is not leaked.
It can be understood that, after the leak detection liquid is applied to the surface of the liner 200, if the air tightness of the liner 200 is poor and there is an air leakage, the leaked air will cause the leak detection liquid applied to the surface of the liner 200 to generate bubbles, and the air leakage position of the liner 200 can be determined according to the position where the bubbles are generated.
Otherwise, the leak detection liquid smeared on the surface of the liner 200 can not generate bubbles. Therefore, by determining whether the leak detection liquid generates bubbles within the preset time, if the leak detection liquid smeared on the surface of the liner 200 does not generate bubbles, it can be determined that the liner 200 is not leaking gas.
Wherein, leak detection liquid can be smeared at the welding line of the liner 200 and/or at the joint of the liner 200 and the first sealing valve 310. It can be appreciated that the probability of occurrence of air leakage at the weld of the liner 200 and the connection of the liner 200 and the first sealing valve 310 is high, and the application area of the leakage detection liquid can be reduced and the efficiency of detecting the air tightness of the liner 200 can be improved by applying the leakage detection liquid at the weld of the liner 200 and/or the connection of the liner 200 and the first sealing valve 310. Of course, the leak detection liquid may be applied to all surfaces of the liner 200, or may be applied to other positions of the liner 200.
In other embodiments, the leak detection fluid is a fluid capable of color reacting with the gas filled in bladder 200. For example: the gas filled into the liner 200 can contain ammonia gas, and the leak detection liquid is phenolphthalein solution. When the gas in the liner 200 leaks, the leaked ammonia gas reacts with the leakage detection liquid, so that the leakage detection liquid becomes red.
Therefore, the process of determining the air tightness of the liner according to the state of the leakage detection liquid may include the steps of:
1311. judging whether the color of the leakage detection liquid changes within a preset time.
1312. If not, determining that the liner is not leaked.
As shown in fig. 6, the passage 312 of the first sealing valve 310 communicates with the outside through the second valve 360. In this embodiment of the present application, after the air tightness of the liner is determined according to the first air pressure value and the second air pressure value, or after the air tightness of the liner is determined according to the state of the leak detection liquid, the method may further include the following steps: and opening the second valve to discharge the gas in the inner container to the outside.
It can be appreciated that after the air tightness of the inner container 200 is detected, the air in the inner container 200 can be rapidly discharged to the outside by opening the second valve 360, so that the inner container 200 can be conveniently separated from the first sealing valve 310, the first sealing valve 310 can be connected with the next inner container 200, the air tightness of the next inner container 200 is detected, and the efficiency of detecting the air tightness of the inner container 200 is improved.
The embodiment of the present application further provides a liner air tightness detection device 300, as shown in fig. 3 and 4, where the liner air tightness detection device 300 includes a liner support 320, and a first sealing valve 310 disposed on the liner support 320, the first sealing valve 310 is used for being connected with the first inlet 220 of the liner 200 and sealing the first inlet 220 of the liner 200, and a channel 312 for communicating with the first inlet 220 is disposed on the first sealing valve 310. The inner liner airtightness detection apparatus 300 further includes a pressure sensor 340 and a first valve 350, the pressure sensor 340 being in communication with the passage 312 of the first sealing valve 310; the output of the first valve 350 communicates with the first inlet 220.
When the airtightness of the liner 200 is detected by the liner airtightness detection apparatus 300, the first sealing valve 310 is connected to the first inlet 220 of the liner 200 and seals the first inlet 220 of the liner 200, and the channel 312 on the first sealing valve 310 is communicated with the first inlet 220 of the liner 200, and then the first sealing valve 310 is supported on the liner support 320 to place the liner 200 on the liner support 320.
Afterwards, the air can be filled into the inner container 200 through the input end of the first valve 350, and the air pressure value in the inner container 200 is detected in real time through the pressure sensor 340, and when the air pressure value in the inner container 200 reaches the first air pressure value, the first valve 350 is closed to close the first inlet 220 of the inner container 200.
After the first inlet 220 of the liner 200 is closed for a preset time, the air pressure value of the pressure sensor 340 is obtained to detect the second air pressure value of the liner 200, so as to determine the air tightness of the liner 200 according to the first air pressure value and the second air pressure value. Alternatively, after the first valve 350 is closed to close the first inlet 220 of the liner 200, a leak detection liquid may be applied to the surface of the liner 200, and the air tightness of the liner 200 may be determined according to the state of the leak detection liquid.
The manner of determining the air tightness of the liner 200 according to the first air pressure value and the second air pressure value, and determining the air tightness of the liner 200 according to the state of the leakage detection liquid may refer to the above embodiments, and will not be described herein.
As shown in fig. 6, one end of the pressure sensor 340 is connected to the channel 312 and the output end of the first valve 350, and the other end of the pressure sensor 340 is connected to the outside through the second valve 360, and after the air tightness of the liner 200 is detected, the air in the liner 200 can be rapidly discharged to the outside by opening the second valve 360, so that the liner 200 is conveniently separated from the first sealing valve 310.
The liner support 320 is further provided with a second sealing valve 321, where the second sealing valve 321 is used to connect with the second inlet 240 of the liner 200 and seal the second inlet 240 of the liner 200.
The second sealing valve 321 is slidably connected to the liner support frame 320 through a support base 323 such that the second sealing valve 321 is close to or far from the first sealing valve 310. The liner support 320 is provided with a pushing assembly 330, the pushing assembly 330 is located at one side of the first sealing valve 310 along the direction from the first end 201 to the second end 202 of the liner 200, the pushing assembly 330 comprises a pushing member 331 and a driving structure 332, the driving structure 332 is mounted on the liner support 320, and the driving structure 332 is connected with the pushing member 331 to drive the pushing member 331 to approach or separate from the first sealing valve 310.
The liner support 320 is provided with a pushing component 330, the pushing component 330 is located at one side of the first sealing valve 310 along the direction from the first end 201 to the second end 202 of the liner 200, the pushing component 330 comprises a pushing piece 331 and a driving structure 332, the driving structure 332 is mounted on the liner support 320, and the driving structure 332 is connected with the pushing piece 331 to drive the pushing piece 331 to be close to or far away from the first sealing valve 310. The driving structure 332 drives the pushing member 331 to approach the first sealing valve 310, so that the pushing member 331 abuts against the supporting seat 323 of the second sealing valve 321, and thus thrust is applied to the second sealing valve 321, the outer surface of the liner 200 at the first interface 210 is abutted against the surface of the first sealing valve 310, and the outer surface of the second end 202 of the liner 200 is abutted against the surface of the second sealing valve 321. Alternatively, the pushing member 331 may be directly abutted against the first end 201 of the liner 200, and a pushing force may be applied to the liner 200, so that the outer surface of the liner 200 at the first interface 210 may be abutted against the surface of the first sealing valve 310.
The driving structure 332 includes a control valve 333 and a cylinder barrel 334 mounted on the liner support 320, and the pushing member 331 is a piston rod slidably mounted in the cylinder barrel 334, and an output end of the control valve 333 is communicated with the cylinder barrel 334 to control a sliding direction of the piston rod so that the piston rod is close to or far from the first sealing valve 310.
The input of the first valve 350 communicates with the output of the first air pressure regulating valve 370, the input of the control valve 333 communicates with the output of the second air pressure regulating valve 380, and the input of the first air pressure regulating valve 370 communicates with the inflation line 390 such that the passage 312 of the first sealing valve 310 communicates with the inflation line 390 through the first valve 350. The input of the second air pressure regulator 380 is in communication with an inflation line 390.
In the method for detecting the air tightness of the inner liner and the apparatus 300 for detecting the air tightness of the inner liner according to the embodiments of the present application, the inner liner 200 having only the first inlet 220 may be detected, or the inner liner 200 having both the first inlet 220 and the second inlet 240 may be detected, and only the second inlet 240 of the inner liner 200 may be sealed by the second sealing valve 321.
The process of detecting the airtightness of the liner 200 by the liner airtightness detection apparatus 300 will be described in detail.
First, the first interface 210 of the liner 200 is inserted into the first insertion hole 311 of the first sealing valve 310, and the first inlet 220 of the liner 200 communicates with the passage 312 of the first sealing valve 310. Meanwhile, the second interface part 230 of the liner 200 is inserted into the second insertion hole 322 of the second sealing valve 321.
Then, the first sealing valve 310 and the second sealing valve 321 are supported on the liner support frame 320.
Then, the first inlet 220 of the charging line 390 is opened to charge the gas into the charging line 390. Meanwhile, the air pressure input to the control valve 333 is regulated by the second air pressure regulating valve 380, and the piston rod is controlled to extend towards the first sealing valve 310 by the control valve 333, so that the piston rod is abutted against the supporting seat 323 of the second sealing valve 321 and applies thrust to the supporting seat, the outer surface of the liner 200 at the first interface 210 is abutted against the surface of the first sealing valve 310 to seal the first inlet 220 of the liner 200, and the outer surface of the second end 202 of the liner 200 is abutted against the surface of the second sealing valve 321 to seal the second inlet 240.
Thereafter, the first valve 350 is opened, the second valve 360 is closed, and the pressure of the gas introduced into the first valve 350 is regulated by the first gas pressure regulating valve 370 to inflate the bladder 200. Meanwhile, the pressure sensor 340 detects the air pressure value in the inner container 200, and when the air pressure value in the inner container 200 reaches the first air pressure value, the first valve 350 is closed. After the inner bladder air tightness detecting apparatus 300 is maintained for a preset time, the air pressure value of the pressure sensor 340 (which is the second air pressure value in the inner bladder 200) is acquired, and the air tightness of the inner bladder 200 is determined according to the first air pressure value and the second air pressure value.
Finally, after the air tightness of the inner container 200 is detected, the second valve 360 is opened to discharge the air in the inner container 200 to the outside. After the piston rod is controlled to be retracted by the control valve 333, the first sealing valve 310 and the second sealing valve 321 are removed from the liner holder 320, and the first interface 210 and the second interface 230 of the liner 200 are removed from the first insertion hole 311 and the second insertion hole 322, respectively.
In the foregoing embodiments, the descriptions of the embodiments are emphasized, and for parts of one embodiment that are not described in detail, reference may be made to related descriptions of other embodiments.
The above describes in detail a method and an apparatus for detecting air tightness of a liner, which are provided in the embodiments of the present application, and specific examples are applied herein to describe the principles and embodiments of the present application, where the description of the above embodiments is only for helping to understand the technical solution and core ideas of the present application; those of ordinary skill in the art will appreciate that: the technical scheme described in the foregoing embodiments can be modified or some technical features thereof can be replaced by equivalents; such modifications and substitutions do not depart from the spirit of the corresponding technical solutions from the scope of the technical solutions of the embodiments of the present application.

Claims (10)

1. A method for detecting the air tightness of a liner, the method comprising:
inflating the inner container through a first inlet of the inner container, and closing the first inlet of the inner container after the air pressure in the inner container reaches a first air pressure value;
detecting a second air pressure value of the inner container after a first inlet of the inner container is closed for a preset time, and determining the air tightness of the inner container according to the first air pressure value and the second air pressure value; or alternatively, the process may be performed,
and coating leakage detection liquid on the surface of the liner, and determining the air tightness of the liner according to the state of the leakage detection liquid.
2. The liner air tightness detection method according to claim 1, wherein said determining air tightness of said liner according to said first air pressure value and said second air pressure value comprises:
calculating a difference between the first air pressure value and the second air pressure value;
comparing the difference value of the first air pressure value and the second air pressure value with a preset threshold value;
and if the difference value between the first air pressure value and the second air pressure value is smaller than or equal to the preset threshold value, determining that the liner is not air-leaked.
3. The liner air tightness detection method according to claim 2, wherein said method further comprises:
If the difference value between the first air pressure value and the second air pressure value is larger than the preset threshold value, coating leakage detection liquid on the surface of the liner;
acquiring the position of the leak detection liquid where bubbles are generated;
and determining the position of the air leakage of the liner according to the position of the air bubble generated by the leakage detection liquid.
4. A method of detecting air tightness of an inner container according to claim 1, wherein said inflating the inner container through the first inlet of the inner container and closing the first inlet of the inner container after the air pressure in the inner container reaches a first air pressure value comprises:
connecting a first sealing valve with and sealing the first inlet of the inner container, wherein the first sealing valve is provided with a channel communicated with the first inlet of the inner container;
and inflating the inner container through the channel, and closing the channel after the air pressure in the inner container reaches a first air pressure value so as to close the first inlet of the inner container.
5. A method of detecting the air tightness of a liner according to claim 4, wherein the liner has a first end and a second end opposite to each other, a first interface portion is provided on a surface of the first end of the liner, and the first inlet is located at a free end of the first interface portion; a first jack for the first interface part to be inserted is formed in one side of the first sealing valve, and the channel is formed in the bottom surface of the first jack; the first sealing valve is connected with the first inlet of the inner container and seals the first inlet of the inner container, and the sealing valve comprises:
Inserting a first interface part of the liner into the first jack so that a first inlet of the first interface part is communicated with the channel on the bottom surface of the first jack;
and applying a thrust force towards the first end to the second end of the inner container, so that the outer surface of the first end of the inner container is tightly attached to the surface of the first sealing valve, and the first inlet of the inner container is sealed.
6. A method of detecting air tightness of an inner liner according to claim 5, wherein the second end of the inner liner is provided with a second inlet, and the pushing force toward the first end is applied to the second end of the inner liner to make the outer surface of the first end of the inner liner closely contact with the surface of the first sealing valve to seal the first inlet of the inner liner, comprising:
connecting a second sealing valve with a second inlet of the inner container and sealing the second inlet of the inner container;
and applying a thrust force towards the first end to the second sealing valve, so that the outer surface of the first end of the inner container is tightly attached to the surface of the first sealing valve to seal the first inlet of the inner container, and the outer surface of the second end of the inner container is tightly attached to the surface of the second sealing valve to seal the second inlet of the inner container.
7. The liner air tightness detection method according to claim 4, wherein said passage communicates with a pressure sensor; the channel is communicated with the air charging pipeline through a first valve; the said air inflation to the said inner container through the said channel, and close the said channel after the air pressure in the said inner container reaches the first air pressure value, including:
inflating the channel through the inflation line to inflate the liner;
acquiring the air pressure value of the pressure sensor in real time;
and closing the first valve after the air pressure value of the pressure sensor reaches the first air pressure value so as to close the channel.
8. A liner air tightness detection method according to claim 7, wherein said detecting a second air pressure value of said liner after closing said first inlet of said liner for a preset time includes:
and acquiring the air pressure value of the pressure sensor after closing the first inlet of the inner container for a preset time so as to detect the second air pressure value of the inner container.
9. The method of claim 4, wherein the channel is communicated with the outside through a second valve, and after the air tightness of the inner container is determined according to the first air pressure value and the second air pressure value, or after the air tightness of the inner container is determined according to the state of the leak detection liquid, the method further comprises:
And opening the second valve to discharge the gas in the inner container to the outside.
10. An inner liner airtightness detection apparatus, comprising:
a liner support;
the sealing valve first sealing valve is arranged on the inner container bracket and is used for being connected with the first inlet of the inner container and sealing the first inlet of the inner container, and a channel used for being communicated with the first inlet of the inner container is arranged on the sealing valve first sealing valve;
a pressure sensor in communication with the channel;
and the output end of the first valve is communicated with the first inlet of the inlet.
CN202111271665.2A 2021-10-29 2021-10-29 Inner container air tightness detection method and device Pending CN116067587A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
CN202111271665.2A CN116067587A (en) 2021-10-29 2021-10-29 Inner container air tightness detection method and device

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
CN202111271665.2A CN116067587A (en) 2021-10-29 2021-10-29 Inner container air tightness detection method and device

Publications (1)

Publication Number Publication Date
CN116067587A true CN116067587A (en) 2023-05-05

Family

ID=86171862

Family Applications (1)

Application Number Title Priority Date Filing Date
CN202111271665.2A Pending CN116067587A (en) 2021-10-29 2021-10-29 Inner container air tightness detection method and device

Country Status (1)

Country Link
CN (1) CN116067587A (en)

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