CN109211492B - Air tightness detection system and method - Google Patents

Air tightness detection system and method Download PDF

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Publication number
CN109211492B
CN109211492B CN201811260676.9A CN201811260676A CN109211492B CN 109211492 B CN109211492 B CN 109211492B CN 201811260676 A CN201811260676 A CN 201811260676A CN 109211492 B CN109211492 B CN 109211492B
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China
Prior art keywords
air valve
air
valve
detection assembly
pressure sensor
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CN201811260676.9A
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Chinese (zh)
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CN109211492A (en
Inventor
单丰武
雷芳
邹峰
黄飞
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Jiangxi Jiangling Group New Energy Automobile Co Ltd
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Jiangxi Jiangling Group New Energy Automobile Co Ltd
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    • GPHYSICS
    • G01MEASURING; TESTING
    • G01MTESTING STATIC OR DYNAMIC BALANCE OF MACHINES OR STRUCTURES; TESTING OF STRUCTURES OR APPARATUS, NOT OTHERWISE PROVIDED FOR
    • G01M3/00Investigating fluid-tightness of structures
    • G01M3/02Investigating fluid-tightness of structures by using fluid or vacuum
    • G01M3/26Investigating 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
    • GPHYSICS
    • G01MEASURING; TESTING
    • G01MTESTING STATIC OR DYNAMIC BALANCE OF MACHINES OR STRUCTURES; TESTING OF STRUCTURES OR APPARATUS, NOT OTHERWISE PROVIDED FOR
    • G01M3/00Investigating fluid-tightness of structures
    • G01M3/02Investigating fluid-tightness of structures by using fluid or vacuum
    • G01M3/26Investigating 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
    • G01M3/28Investigating 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 pipes, cables or tubes; for pipe joints or seals; for valves ; for welds
    • G01M3/2807Investigating 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 pipes, cables or tubes; for pipe joints or seals; for valves ; for welds for pipes
    • G01M3/2815Investigating 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 pipes, cables or tubes; for pipe joints or seals; for valves ; for welds for pipes using pressure measurements
    • GPHYSICS
    • G01MEASURING; TESTING
    • G01MTESTING STATIC OR DYNAMIC BALANCE OF MACHINES OR STRUCTURES; TESTING OF STRUCTURES OR APPARATUS, NOT OTHERWISE PROVIDED FOR
    • G01M3/00Investigating fluid-tightness of structures
    • G01M3/02Investigating fluid-tightness of structures by using fluid or vacuum
    • G01M3/26Investigating 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
    • G01M3/28Investigating 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 pipes, cables or tubes; for pipe joints or seals; for valves ; for welds
    • G01M3/2838Investigating 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 pipes, cables or tubes; for pipe joints or seals; for valves ; for welds for cables
    • GPHYSICS
    • G01MEASURING; TESTING
    • G01MTESTING STATIC OR DYNAMIC BALANCE OF MACHINES OR STRUCTURES; TESTING OF STRUCTURES OR APPARATUS, NOT OTHERWISE PROVIDED FOR
    • G01M3/00Investigating fluid-tightness of structures
    • G01M3/02Investigating fluid-tightness of structures by using fluid or vacuum
    • G01M3/26Investigating 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
    • G01M3/28Investigating 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 pipes, cables or tubes; for pipe joints or seals; for valves ; for welds
    • G01M3/2876Investigating 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 pipes, cables or tubes; for pipe joints or seals; for valves ; for welds for valves

Abstract

The invention discloses an air tightness detection system which is applied to an automobile and comprises an air source, a wiring harness detection assembly, a part detection assembly and a standard volume tank, wherein the wiring harness detection assembly, the part detection assembly and the standard volume tank are respectively connected with the air source, the wiring harness detection assembly is used for detecting the air tightness of a wiring harness on the automobile, the part detection assembly is used for detecting the air tightness of other parts except the wiring harness on the automobile, the standard volume tank is respectively communicated with the wiring harness detection assembly and the part detection assembly, and a pipeline communicated with the wiring harness detection assembly and the part detection assembly of the standard volume tank is respectively provided with a first pressure sensor and a second pressure sensor. The wire harness detection assembly and the part detection assembly share one standard volume tank, so that the production cost is reduced. The invention also discloses an air tightness detection method adopting the air tightness detection system.

Description

Air tightness detection system and method
Technical Field
The invention relates to the technical field of automobile part processing, in particular to an air tightness detection system and method.
Background
With the rapid development of the automobile industry and the improvement of the living standard of people, automobiles become one of indispensable transportation tools for people to go out, freight transportation and the like.
The automobile needs to carry out leakproofness detection to its spare part in process of production, for example the gas tightness of pencil and other spare parts detects, and the gas tightness performance is very important for automobile parts, if its gas tightness exists not enough, can lead to problems such as leaking and infiltration to cause some function failure in the airtight connector. The existing air tightness detection device can respectively and independently detect the air tightness of a wire harness or other parts.
When the existing air tightness detection device detects the air tightness of a wire harness or other parts, different standard volume tanks must be connected respectively, gas is injected into the air tightness detection assembly and the standard volume tanks simultaneously through a gas source, whether the product is good in air tightness is judged according to the pressure change in the air tightness detection assembly, two standard volume tanks need to be arranged in the air tightness detection device at least, the size of the device is increased, and the cost is increased.
Disclosure of Invention
One object of the present invention is to propose a tightness detection system that requires only one standard volume tank.
The utility model provides an air tightness detection system, is applied to on the car, including air supply, pencil determine module, spare part determine module and standard volume jar, pencil determine module the spare part determine module with standard volume jar is connected respectively the air supply, pencil determine module is used for detecting the gas tightness of pencil on the car, spare part determine module is used for detecting the gas tightness of other spare parts outside the pencil on the car, standard volume jar respectively with pencil determine module with spare part determine module intercommunication, standard volume jar with pencil determine module with be equipped with first pressure sensor and second pressure sensor on the pipeline of spare part determine module intercommunication respectively.
According to the air tightness detection system provided by the invention, the wire harness detection assembly and the part detection assembly share one standard volume tank, so that the production cost is reduced, the wire harness detection assembly and the part detection assembly are directly communicated with the standard volume tank, and the air tightness detection of the wire harness and other parts can be simultaneously met by utilizing the simple design.
In addition, the airtightness detection system provided by the invention can also have the following additional technical characteristics:
furthermore, a first air valve, a second air valve and a third air valve are respectively arranged on pipelines of the air source, which are connected with the standard volume tank, the wire harness detection assembly and the part detection assembly, so that air transmission to corresponding assemblies can be respectively controlled through the first air valve, the second air valve and the third air valve.
Further, the first air valve, the second air valve and the third air valve are arranged in the air valve assembly at the same time, the air valve assembly is provided with air passing grooves and through holes corresponding to the first air valve, the second air valve and the third air valve, the air passing grooves are separated from one another, the first air valve, the second air valve and the third air valve are respectively arranged in the air passing grooves, the through holes are communicated with the air passing grooves corresponding to the air passing grooves, the through holes are respectively communicated with the wiring harness detection assembly, the part detection assembly and the standard volume tank, the first air valve, the second air valve and the third air valve are matched and sealed with the air passing grooves, and when the first air valve, the second air valve and the third air valve are sealed, the through holes are in a closed state.
The first air valve, the second air valve and the third air valve are integrated in the air valve assembly, so that the three air valves can be adjusted conveniently.
Furthermore, the first air valve, the second air valve and the third air valve respectively comprise adjusting rods and pistons, the pistons are arranged in the air passing grooves and are in sealing fit with the air passing grooves, the adjusting rods are connected with the pistons and extend out of the shell of the air valve assembly, and the adjusting rods are used for adjusting the positions of the pistons. The position of the piston can be adjusted through the adjusting rod, and the opening and the closing of each air valve are realized.
Furthermore, the shell is provided with a guide block, the adjusting rod penetrates through the guide block, the thickness of the shell is increased through the guide block, the contact length of the adjusting rod and the shell is prolonged, the movement of the adjusting rod can be guided, and the adjusting rod is prevented from being laterally deviated due to forces in different directions.
Furthermore, a cavity is formed in the guide block, the adjusting rod penetrates through the cavity, a first baffle is arranged on the adjusting rod of the first air valve, second baffles are arranged on the adjusting rods of the second air valve and the third air valve, when the piston of the second air valve or the third air valve is separated from and sealed with the corresponding air passing groove, the second baffle pushes the first baffle, and the first baffle drives the piston of the first air valve to be separated from and sealed with the corresponding air passing groove. When any one of the second air valve and the third air valve is opened, the first air valve can be driven to be opened, so that a user does not need to manually open the first air valve additionally, and the use convenience is enhanced.
Furthermore, the adjusting rod is in sliding fit or threaded fit with the guide block and can be selected according to actual conditions.
Furthermore, a fourth air valve and a third pressure sensor are arranged on a pipeline connecting the air source and the air valve assembly, and the third pressure sensor is used for detecting the air tightness of the pipeline between the air valve assembly and the fourth air valve.
Another objective of the present invention is to provide a method for detecting air tightness of the above air tightness detection system, which includes the following steps:
simultaneously closing the first air valve, the second air valve and the third air valve, opening the fourth air valve, and starting the air source to start inflation;
closing the air source and the fourth air valve, and observing whether the third pressure sensor detects that the air pressure changes;
if the third pressure sensor detects that the air pressure is unchanged, opening the first air valve, the second air valve, the third air valve and the fourth air valve, and starting an air source to start inflation;
and closing the first air valve, the second air valve and the third air valve, observing the change of the detection pressure of the first pressure sensor and the second pressure sensor, and respectively judging whether the air tightness of the wire harness and parts except the wire harness is good or not and whether the air tightness of the corresponding parts is insufficient or not when the detection pressure of the first pressure sensor and the second pressure sensor is unchanged.
Further, after the observing that the third pressure sensor detects whether the air pressure changes, the method further includes:
and if the third pressure sensor detects that the air pressure changes, checking the air tightness of the first air valve, the second air valve, the third air valve and the fourth air valve, and replacing the air valve with insufficient air tightness.
The beneficial effects of the invention at least comprise:
(1) the wire harness detection assembly and the part detection assembly share one standard volume tank, so that the production cost is reduced;
(2) the first air valve, the second air valve and the third air valve are integrated on the air valve assembly, so that the operation convenience of the air valves is improved;
(3) when any one of the second air valve and the third air valve is opened, the first air valve is opened along with the second air valve, so that the operation of opening the air valves is reduced;
(4) the fourth air valve can be used for carrying out air tightness detection on the first air valve, the second air valve, the third air valve, the fourth air valve and pipelines in the first air valve, the second air valve, the third air valve, the fourth air valve and the pipelines in the fourth air valve, so that detection errors caused by insufficient air tightness of the air valves or the pipelines are prevented.
Additional aspects and advantages of the invention will be set forth in part in the description which follows and, in part, will be obvious from the description, or may be learned by practice of the invention.
Drawings
The above and/or additional aspects and advantages of the present invention will become apparent and readily appreciated from the following description of the embodiments, taken in conjunction with the accompanying drawings of which:
fig. 1 is a schematic view showing the connection of elements of a airtightness detection system according to a first embodiment of the present invention;
FIG. 2 is a schematic diagram showing the connection of specific components of the gas tightness detection system of FIG. 1;
FIG. 3 is a schematic diagram of the construction of the gas valve assembly of FIG. 2;
FIG. 4 is a schematic cross-sectional view of the gas valve assembly of FIG. 3;
FIG. 5 is a side cross-sectional structural schematic view of the gas valve assembly of FIG. 3;
in the figure: 1-air source, 11-fourth air valve, 2-wire harness detection component, 21-second air valve, 22-first pressure sensor, 3-standard volume tank, 31-first air valve, 4-part detection component, 41-third air valve, 42-second pressure sensor, 5-air valve assembly, 51-shell, 511-through hole, 512-air passing groove, 52-guide block, 6-adjusting rod, 61-first baffle, 62-second baffle and 7-piston.
Detailed Description
In order to make the objects, features and advantages of the present invention comprehensible, embodiments accompanied with figures are described in detail below. Several embodiments of the invention are presented in the drawings. This invention may, however, be embodied in many different forms and should not be construed as limited to the embodiments set forth herein. Rather, these embodiments are provided so that this disclosure will be thorough and complete.
It will be understood that when an element is referred to as being "secured to" another element, it can be directly on the other element or intervening elements may also be present. When an element is referred to as being "connected" to another element, it can be directly connected to the other element or intervening elements may also be present. As used herein, the terms "vertical," "horizontal," "left," "right," "up," "down," and the like are for illustrative purposes only and do not indicate or imply that the referenced device or element must be in a particular orientation, constructed or operated in a particular manner, and is not to be construed as limiting the present invention.
In the present invention, unless otherwise expressly specified or limited, the terms "mounted," "connected," "secured," and the like are to be construed broadly and can, for example, be fixedly connected, detachably connected, or integrally connected; can be mechanically or electrically connected; they may be connected directly or indirectly through intervening media, or they may be interconnected between two elements. The specific meanings of the above terms in the present invention can be understood by those skilled in the art according to specific situations. As used herein, the term "and/or" includes any and all combinations of one or more of the associated listed items.
Referring to fig. 1 and 2, a first embodiment of the present invention provides an air tightness detecting system applied to an automobile, including an air source 1, a wire harness detecting assembly 2, a component detecting assembly 4, and a standard volume tank 3.
Pencil determine module 1 spare part determine module 4 with standard volume jar 3 is connected respectively air supply 1, pencil determine module 2 is used for detecting the gas tightness of the pencil on the car, spare part determine module 4 is used for detecting the gas tightness of other spare parts outside the pencil on the car, standard volume jar 3 respectively with pencil determine module 2 with spare part determine module 4 intercommunication, standard volume jar 3 with pencil determine module 2 with be equipped with first pressure sensor 22 and second pressure sensor 42 on the pipeline of spare part determine module 4 intercommunication respectively.
In the invention, the wiring harness detection assembly 2 and the part detection assembly 4 share one standard volume tank 3, so that the production cost is reduced, the wiring harness detection assembly 2 and the part detection assembly 4 are directly communicated with the standard volume tank 3, and the air tightness detection of the wiring harness and other parts of the automobile can be simultaneously met by utilizing the simple design.
Specifically, the gas source 1 is provided with a first gas valve 31, a second gas valve 21 and a third gas valve 41 on the pipelines connected with the standard volume tank 3, the wire harness detection assembly 2 and the component detection assembly 4, so that gas transmission to the corresponding assemblies can be controlled through the first gas valve 31, the second gas valve 21 and the third gas valve 41.
Referring to fig. 3 to 5, preferably, the first air valve 31, the second air valve 21, and the third air valve 41 are simultaneously disposed in an air valve assembly 5, the air valve assembly 5 is provided with an air passing groove 512 and a through hole 511 corresponding to the first air valve 31, the second air valve 21, and the third air valve 41, the air passing groove 512 is separated from each other, the first air valve 31, the second air valve 21, and the third air valve 41 are respectively disposed in the air passing groove 512, the through hole 511 is communicated with the air passing groove 512, the through hole 511 is respectively communicated with the wire harness detection component 2, the component detection component 4, and the standard volume tank 3 (not shown), the first air valve 31, the second air valve 21, and the third air valve 41 are sealed by matching with the air passing groove 512, and when the first air valve 31, the second air valve 21, and the third air valve 41 are sealed, the through hole 511 is in a closed state.
In this embodiment, each of the first air valve 31, the second air valve 21, and the third air valve 41 includes an adjusting rod 6 and a piston 7, the piston 7 is disposed in the air passing groove 512, and each of the first air valve 31, the second air valve 21, and the third air valve 41 is in sealing fit with the air passing groove 512 through the piston 7.
Further, a fourth air valve 11 and a third pressure sensor 12 are arranged on a pipeline connecting the air source 1 and the air valve assembly 5, and the third pressure sensor 12 is used for detecting the air tightness of the pipeline between the air valve assembly 5 and the fourth air valve 11.
The adjusting rod 6 is connected with the piston 7 and extends outwards out of the shell 51 of the air valve assembly 5, and the adjusting rod 6 is used for adjusting the position of the piston 7 plug.
According to the structure, the position of the piston 7 can be adjusted through the adjusting rod 6, and the opening and the closing of each air valve are realized.
The above structure has an advantage in that the first, second and third air valves 31, 21 and 41 are integrated into an air valve assembly, which facilitates simultaneous adjustment of the three air valves.
Furthermore, the shell 51 is provided with a guide block 52, the adjusting rod 6 penetrates through the guide block 52, the guide block 52 increases the thickness of the shell 51, the contact length of the adjusting rod 6 and the shell 51 is prolonged, the movement of the adjusting rod 6 can be guided, and the adjusting rod 6 is prevented from being laterally deviated due to forces in different directions.
In order to realize simple and quick adjustment of the air valve, a cavity 521 is formed in the guide block 52, the adjusting rods 6 penetrate through the cavity 521, a first baffle 61 is arranged on the adjusting rod 6 of the first air valve 31, second baffles 62 are arranged on the adjusting rods of the second air valve 21 and the third air valve 41, when the piston 7 of the second air valve 21 or the third air valve 41 is separated from the corresponding air passing groove 512 for sealing, the second baffle 62 pushes the first baffle 61, and the first baffle 61 drives the piston of the first air valve 21 to separate from the corresponding air passing groove 512 for sealing.
In the present embodiment, the above structure can be embodied as: the guide block 52 is disposed at an upper portion of the housing 51, and the first shutter 61 is positioned above the second shutter 62.
On the basis of the structure, when any one of the second air valve 21 and the third air valve 41 is opened, the first air valve 31 is driven to be opened, so that a user does not need to manually open the first air valve 31 additionally, and the use convenience is enhanced.
In this embodiment, the adjusting rod 6 is in sliding fit with the guide block 52, and then the adjusting rod 6 is fixed by an external fixing structure, so that the corresponding air valve can be continuously opened. In other embodiments, the adjusting rod 6 and the guide block 52 may be screw-engaged, and those skilled in the art can select the adjusting rod according to the actual situation.
The second embodiment of the present invention provides an air tightness detection method, which adopts the air tightness detection system, and includes the following steps:
simultaneously closing the first air valve, the second air valve and the third air valve, opening the fourth air valve, and starting the air source to start inflation;
closing the air source and the fourth air valve, and observing whether the third pressure sensor detects that the air pressure changes;
if the third pressure sensor detects that the air pressure is unchanged, opening the first air valve, the second air valve, the third air valve and the fourth air valve, and starting an air source to start inflation;
and closing the first air valve, the second air valve and the third air valve, observing the change of the detection pressure of the first pressure sensor and the second pressure sensor, and respectively judging whether the air tightness of the wire harness and parts except the wire harness is good or not and whether the air tightness of the corresponding parts is insufficient or not when the detection pressure of the first pressure sensor and the second pressure sensor is unchanged.
The fourth air valve is used for observing whether the third pressure sensor detects that the air pressure changes or not, and then the method further comprises the following steps:
and if the third pressure sensor detects that the air pressure changes, checking the air tightness of the first air valve, the second air valve, the third air valve and the fourth air valve, and replacing the air valve with insufficient air tightness.
By preferentially checking the airtightness of the gas valve and the pipeline, errors generated during the detection process can be prevented.
In the description herein, references to the description of the term "one embodiment," "some embodiments," "an example," "a specific example," or "some examples," etc., mean that a particular feature, structure, material, or characteristic described in connection with the embodiment or example is included in at least one embodiment or example of the invention. In this specification, the schematic representations of the terms used above do not necessarily refer to the same embodiment or example. Furthermore, the particular features, structures, materials, or characteristics described may be combined in any suitable manner in any one or more embodiments or examples.
The above-mentioned embodiments only express several embodiments of the present invention, and the description thereof is more specific and detailed, but not construed as limiting the scope of the present invention. It should be noted that, for a person skilled in the art, several variations and modifications can be made without departing from the inventive concept, which falls within the scope of the present invention. Therefore, the protection scope of the present patent shall be subject to the appended claims.

Claims (5)

1. The air tightness detection system is applied to an automobile and is characterized by comprising an air source, a wiring harness detection assembly, a part detection assembly and a standard volume tank, wherein the wiring harness detection assembly, the part detection assembly and the standard volume tank are respectively connected with the air source, the wiring harness detection assembly is used for detecting the air tightness of a wiring harness on the automobile, the part detection assembly is used for detecting the air tightness of other parts except the wiring harness on the automobile, the standard volume tank is respectively communicated with the wiring harness detection assembly and the part detection assembly, and a pipeline communicated with the wiring harness detection assembly and the part detection assembly of the standard volume tank is respectively provided with a first pressure sensor and a second pressure sensor;
the pipelines of the air source, which are connected with the standard volume tank, the wire harness detection assembly and the part detection assembly are respectively provided with a first air valve, a second air valve and a third air valve, so that air transmission to corresponding assemblies can be respectively controlled through the first air valve, the second air valve and the third air valve;
the first air valve, the second air valve and the third air valve are arranged in an air valve assembly at the same time, the air valve assembly is provided with air passing grooves and through holes corresponding to the first air valve, the second air valve and the third air valve, the air passing grooves are separated from one another, the first air valve, the second air valve and the third air valve are respectively arranged in the air passing grooves, the through holes are communicated with the air passing grooves corresponding to the air passing grooves, the through holes are respectively communicated with the wiring harness detection assembly, the part detection assembly and the standard volume tank, the first air valve, the second air valve and the third air valve are matched and sealed with the air passing grooves, and when the first air valve, the second air valve and the third air valve are sealed, the through holes are in a closed state;
the first air valve, the second air valve and the third air valve respectively comprise adjusting rods and pistons, the pistons are arranged in the air passing grooves and are in sealing fit with the air passing grooves, the adjusting rods are connected with the pistons and extend out of the shell of the air valve assembly, and the adjusting rods are used for adjusting the positions of the pistons;
the shell is provided with a guide block, and the adjusting rod penetrates through the guide block;
the guide block is internally provided with a cavity, the adjusting rods penetrate through the cavity, the adjusting rod of the first air valve is provided with a first baffle, the adjusting rods of the second air valve and the third air valve are provided with second baffles, when the piston of the second air valve or the third air valve is separated from and sealed with the corresponding air passing groove, the second baffle pushes the first baffle, and the first baffle drives the piston of the first air valve to be separated from and sealed with the corresponding air passing groove.
2. The system for detecting air tightness according to claim 1, wherein the adjusting rod is in sliding fit or threaded fit with the guide block.
3. The airtightness detection system according to any one of claims 1 to 2, wherein a fourth air valve and a third pressure sensor are provided on a pipeline connecting the air source and the air valve assembly, and the third pressure sensor is configured to detect airtightness of the pipeline between the air valve assembly and the fourth air valve.
4. A method for detecting airtightness by using the airtightness detection system according to claim 3, comprising the steps of:
simultaneously closing the first air valve, the second air valve and the third air valve, opening the fourth air valve, and starting the air source to start inflation;
closing the air source and the fourth air valve, and observing whether the third pressure sensor detects that the air pressure changes;
if the third pressure sensor detects that the air pressure is unchanged, opening the first air valve, the second air valve, the third air valve and the fourth air valve, and starting an air source to start inflation;
and closing the first air valve, the second air valve and the third air valve, observing the change of the detection pressure of the first pressure sensor and the second pressure sensor, and respectively judging whether the air tightness of the wire harness and parts except the wire harness is good or not and whether the air tightness of the corresponding parts is insufficient or not when the detection pressure of the first pressure sensor and the second pressure sensor is unchanged.
5. The airtightness detection method according to claim 4, wherein the observing whether the third pressure sensor detects a change in the air pressure further comprises:
and if the third pressure sensor detects that the air pressure changes, checking the air tightness of the first air valve, the second air valve, the third air valve and the fourth air valve, and replacing the air valve with insufficient air tightness.
CN201811260676.9A 2018-10-26 2018-10-26 Air tightness detection system and method Active CN109211492B (en)

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