CN112393848B - Anti-cheating mechanism and air tightness detection instrument - Google Patents
Anti-cheating mechanism and air tightness detection instrument Download PDFInfo
- Publication number
- CN112393848B CN112393848B CN202011281569.1A CN202011281569A CN112393848B CN 112393848 B CN112393848 B CN 112393848B CN 202011281569 A CN202011281569 A CN 202011281569A CN 112393848 B CN112393848 B CN 112393848B
- Authority
- CN
- China
- Prior art keywords
- air outlet
- joint
- cheating
- communicated
- piece
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Active
Links
Images
Classifications
-
- 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
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01P—MEASURING LINEAR OR ANGULAR SPEED, ACCELERATION, DECELERATION, OR SHOCK; INDICATING PRESENCE, ABSENCE, OR DIRECTION, OF MOVEMENT
- G01P13/00—Indicating or recording presence, absence, or direction, of movement
- G01P13/0006—Indicating or recording presence, absence, or direction, of movement of fluids or of granulous or powder-like substances
Landscapes
- Physics & Mathematics (AREA)
- General Physics & Mathematics (AREA)
- Examining Or Testing Airtightness (AREA)
Abstract
The invention relates to the technical field of air tightness detection, and particularly discloses an anti-cheating mechanism and an air tightness detection instrument, wherein the anti-cheating mechanism comprises a first mounting seat, a valve body and a prompting piece, and the first mounting seat comprises a test air inlet joint, a comparison air inlet joint and a first air outlet joint; the first end of the test air inlet joint is communicated with the tester through a first pipeline, the second end of the test air inlet joint is communicated with the first end of the first air outlet joint through a first channel, and the second end of the first air outlet joint is communicated with a port of a piece to be tested; the contrast air inlet joint is communicated with the tester through a second pipeline; the gas in the to-be-detected piece can enter the valve body through the air inlet of the valve body; the prompting piece is used for prompting that gas passes through the valve body. The invention is communicated with the piece to be tested through the valve body, so that the gas in the piece to be tested can enter the valve body at the later stage of the gas tightness test, and the phenomenon that the gas cannot enter the piece to be tested through cheating means in the test process can be found through detecting the gas passing through the valve body.
Description
Technical Field
The invention relates to the technical field of air tightness detection, in particular to an anti-cheating mechanism and an air tightness detection instrument.
Background
In industrial production, some products have air tightness requirements, and the products need to be subjected to strict air tightness tests before mass production so as to meet production conditions.
When the product is detecting the gas tightness, can appear making the unable cheating phenomenon that gets into the piece that awaits measuring of gas in the test procedure through the means at the port pad pasting of piece that awaits measuring or the first joint pad pasting of giving vent to anger (centrifugal paper), judge that the product is not revealed when leading to detecting, and the actual conditions whether the product is revealed can't learn, because the position of practising a cheat is hidden, the action of this kind of cheating is difficult to discover at the testing process.
Disclosure of Invention
The invention aims to: the utility model provides an anti-cheating mechanism and gas tightness detecting instrument to solve the problem that cheating is difficult to find when detecting the gas tightness of a product in the related technology.
In order to achieve the purpose, the invention adopts the following technical scheme:
in one aspect, the present invention provides an anti-cheating mechanism, comprising:
the first mounting seat comprises a test air inlet joint, a comparison air inlet joint and a first air outlet joint; the first end of the test air inlet joint is communicated with a tester through a first pipeline, the second end of the test air inlet joint is communicated with the first end of the first air outlet joint through a first channel, and the second end of the first air outlet joint is communicated with a port of a piece to be tested; the comparison air inlet joint is communicated with the tester through a second pipeline;
the valve body is used for allowing the internal gas of the piece to be detected to enter the valve body through an air inlet of the valve body;
and the prompting piece is used for prompting that gas passes through the valve body.
Optionally, the anti-cheating mechanism further comprises a second mounting seat, and the second mounting seat is detachably connected with the first mounting seat; the second mounting seat is provided with a second air outlet joint, and a first end of the second air outlet joint is communicated with a second end of the first air outlet joint through a second channel; and the second end of the second air outlet joint is communicated with the port of the piece to be detected.
Optionally, the anti-cheating mechanism further comprises a rubber connecting piece, the rubber connecting piece is detachably connected with the second mounting seat, the rubber connecting piece comprises a third air outlet joint, a first end of the third air outlet joint is communicated with a second end of the second air outlet joint through a third channel, and a second end of the third air outlet joint is communicated with a port of the piece to be detected.
Optionally, the first mounting seat further comprises an anti-cheating joint and a fourth air outlet joint, the second mounting seat further comprises a fifth air outlet joint, and the rubber connecting piece further comprises a sixth air outlet joint;
one end of the anti-cheating joint is communicated with the air inlet hole through a fourth pipeline, and the other end of the anti-cheating joint is communicated with the first end of the fourth air outlet joint through a fourth channel; a second end of the fourth air outlet joint is communicated with a first end of the fifth air outlet joint through a fifth channel, and a second end of the fifth air outlet joint is communicated with a first end of the sixth air outlet joint through a sixth channel; and the second end of the third air outlet joint and the second end of the sixth air outlet joint are communicated with the port of the piece to be tested.
Optionally, the air inlet is in communication with the first conduit through a first anti-cheating channel.
Optionally, the first channel and the fourth channel are in communication through a second anti-cheating channel.
Optionally, the second passage is in communication with the fifth passage through a third cheating-prevention passage.
Optionally, the third channel is communicated with the sixth channel through a fourth anti-cheating channel.
Optionally, the prompting piece is a display screen, the display screen is electrically connected with the tester, and the display screen can display information that gas passes through the valve body.
In another aspect, the present invention provides an air tightness detecting apparatus, including the anti-cheating mechanism according to any one of the above aspects.
The invention has the beneficial effects that:
the invention provides an anti-cheating mechanism, when detecting the air tightness of a piece to be detected, the anti-cheating mechanism firstly closes a valve body and connects a port of the piece to be detected with a first air outlet joint, one path of gas generated by a tester enters the inside of the piece to be detected through a first pipeline, a test air inlet joint and the first air outlet joint, and the other path of gas reaches a comparison air inlet joint through a second pipeline; after keeping for a period of time, comparing the states of the two paths of gas to obtain whether the piece to be detected leaks gas or not; then the tester stops giving vent to anger, opens the valve body, and the inside gas of piece that awaits measuring can get into the valve body through the inlet port of valve body, then characterizes through the suggestion piece to the suggestion observer has gaseous process valve body, can obtain the information that the inside gas of piece that awaits measuring can get into the valve body, and then has proved that the test procedure does not appear the port of piece that awaits measuring by the cheating phenomenon of pad pasting or first joint of giving vent to anger by the pad pasting. When the valve body is opened, the prompting piece gives no prompt, and the fact that the test gas possibly does not enter the piece to be tested and cheating is suspected is proved. The anti-cheating mechanism can effectively prevent an operator from cheating in the testing process.
Drawings
FIG. 1 is a schematic structural diagram of an anti-cheating mechanism according to an embodiment of the present invention;
fig. 2 is a partially enlarged view of a point a in fig. 1.
In the figure:
1. a first mounting seat;
11. testing the air inlet joint; 12. comparing the air inlet joints; 13. anti-cheating joints;
2. a second mounting seat;
3. a rubber connector;
31. a third air outlet joint; 32. a sixth air outlet joint;
4. a valve body;
100. a display screen; 200. a tester;
101. a first pipeline; 102. a second pipeline; 103. a third pipeline; 104. a fourth pipeline.
Detailed Description
The technical solutions of the present invention will be described clearly and completely with reference to the accompanying drawings, and it is to be understood that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
In the description of the present invention, it should be noted that the terms "center", "upper", "lower", "left", "right", "vertical", "horizontal", "inner", "outer", etc., indicate orientations or positional relationships based on the orientations or positional relationships shown in the drawings, and are only for convenience of description and simplicity of description, but do not indicate or imply that the device or element being referred to must have a particular orientation, be constructed and operated in a particular orientation, and thus, should not be construed as limiting the present invention. Furthermore, the terms "first," "second," and the like are used for descriptive purposes only and are not to be construed as indicating or implying relative importance. Where the terms "first position" and "second position" are two different positions, and where a first feature is "over", "above" and "on" a second feature, the first feature is directly over and obliquely above the second feature, or simply means that the first feature is at a higher level than the second feature. A first feature being "under," "below," and "beneath" a second feature includes the first feature being directly under and obliquely below the second feature, or simply meaning that the first feature is at a lesser elevation than the second feature.
In the description of the present invention, it should be noted that, unless otherwise explicitly specified or limited, the terms "mounted," "connected," and "connected" are to be construed broadly, e.g., as meaning either a fixed connection, a removable connection, or an integral connection; 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 in specific cases to those skilled in the art.
Reference will now be made in detail to embodiments of the present invention, examples of which are illustrated in the accompanying drawings, wherein like or similar reference numerals refer to the same or similar elements or elements having the same or similar function throughout. The embodiments described below with reference to the accompanying drawings are illustrative only for the purpose of explaining the present invention, and are not to be construed as limiting the present invention.
Fig. 1 is a schematic structural view of a cheating prevention mechanism according to an embodiment of the present invention, and fig. 2 is a partially enlarged view of a point a in fig. 1. As shown in fig. 1-2, the present embodiment provides an anti-cheating mechanism, which includes a first mounting seat 1, a valve body 4 and a prompting member, wherein the first mounting seat 1 includes a testing air inlet joint 11, a comparison air inlet joint 12 and a first air outlet joint; a first end of the test air inlet joint 11 is communicated with the tester 200 through a first pipeline 101, a second end of the test air inlet joint 11 is communicated with a first end of the first air outlet joint through a first channel, and a second end of the first air outlet joint is communicated with a port of a piece to be tested; the contrast inlet connector 12 is communicated with the tester 200 through a second pipeline 102; the gas in the to-be-detected piece can enter the valve body 4 through the air inlet of the valve body 4; the prompting piece is used for prompting that gas passes through the valve body 4.
When detecting the air tightness of the piece to be detected, firstly, the valve body 4 is closed, the port of the piece to be detected is connected with the first air outlet connector, one path of air generated by the tester 200 enters the interior of the piece to be detected through the first pipeline 101, the test air inlet connector 11, the first channel and the first air outlet connector, the other path of air reaches the comparison air inlet connector 12 through the second pipeline 102, and the air inlet connector 12 is compared with the air inlet connector 12; after keeping for a period of time, obtaining a result of whether the piece to be detected leaks gas or not by comparing the states of the two paths of gas; then tester 200 stops giving vent to anger, opens valve body 4, and the inside gas of piece that awaits measuring can get into valve body 4 through the inlet port of valve body 4, then characterizes through the suggestion piece to the suggestion observer has gas to pass through valve body 4, can obtain the information that the inside gas of piece that awaits measuring can get into valve body 4, and then has proved that the test process does not appear the port of piece that awaits measuring by the cheating phenomenon of pad pasting or first joint of giving vent to anger by the pad pasting. When the valve body is opened, the prompting piece gives no prompt, and the fact that the test gas possibly does not enter the piece to be tested is proved to be suspicious of cheating. The anti-cheating mechanism can effectively prevent an operator from cheating in the testing process.
The prompting member is a member for prompting that gas enters the valve body 4, and a colorless and odorless gas signal needs to be converted into a signal which can be recognized by a detected person. Regarding the representation mode of prompting that gas passes through the valve body 4, in this embodiment, the prompting element may be a speaker or a display screen 100, and when the prompting element is the display screen 100, the display content may be a figure or a character, preferably a segment of waveform. The display screen 100 is electrically connected with the tester 200, gas entering the valve body from the gas inlet hole of the valve body 4 enters the tester 200 through the gas outlet hole of the valve body 4 and the third pipeline 103, and the gas entering the tester 200 is processed by the tester 200 and then displays a section of waveform on the display screen 100.
Of course, in other embodiments, the indicator may also be a flow meter which communicates with the outlet opening of the valve body, when the needle of the flow meter is swung, it is verified that gas is flowing through the valve body 4. In addition, the prompting piece can also be a device capable of making sound through the flowing of gas, and the gas can make sound to make a prompt through the prompting piece. Illustratively, the cue member may be a whistle. The arrangement is low in cost and easy to operate.
As a test part, the first air outlet joint needs to be frequently connected with or detached from a part to be tested, so that the part to be tested is easily damaged or failed, and the replacement cost is high. In this embodiment, optionally, the anti-cheating mechanism further includes a second mounting seat 2, and the second mounting seat 2 is detachably connected, preferably screwed, with the first mounting seat 1; the second mounting seat 2 is provided with a second air outlet joint, and the first end of the second air outlet joint is communicated with the second end of the first air outlet joint through a second channel; and the second end of the second air outlet joint is communicated with the port of the piece to be measured. This be provided with does benefit to and improves maintenance efficiency, reduces maintenance and replacement cost. In this embodiment, further, the anti-cheating mechanism further includes a rubber connecting member 3, the rubber connecting member 3 is detachably connected to the second mounting seat 2, preferably, the rubber connecting member 3 is inserted, the rubber connecting member 3 includes a third air outlet connector 31, a first end of the third air outlet connector 31 is communicated with a second end of the second air outlet connector through a third channel, and a second end of the third air outlet connector 31 is communicated with a port of the to-be-tested member. In this embodiment, rubber connecting piece 3 and the piece lug connection that awaits measuring, when rubber connecting piece 3 appears wearing and tearing and need change, the replacement cost is lower.
The different modes of communication of each joint directly influence the specific position of the anti-cheating channel, and further influence the production cost. Regarding the communication mode of each joint, in this embodiment, optionally, the first mounting base 1 further includes an anti-cheating joint 13 and a fourth air outlet joint, the second mounting base 2 further includes a fifth air outlet joint, and the rubber connecting member 3 further includes a sixth air outlet joint 32; one end of the anti-cheating joint 13 is communicated with the air inlet through a fourth pipeline 104, and the other end of the anti-cheating joint is communicated with the first end of the fourth air outlet joint through a fourth channel; the second end of the fourth air outlet joint is communicated with the first end of the fifth air outlet joint through a fifth channel, and the second end of the fifth air outlet joint is communicated with the first end of the sixth air outlet joint 32 through a sixth channel; the second end of the third outlet connector 31 and the second end of the sixth outlet connector 32 are both communicated with the port of the to-be-tested piece. Above-mentioned setting makes the gas in the piece that awaits measuring can have multiple mode to get into valve body 4, specifically as follows:
the first method is as follows: the air inlet is communicated with the first pipeline through the first anti-cheating channel. The mode has lower cost and is beneficial to later maintenance.
The second method comprises the following steps: the first channel is communicated with the fourth channel through the second anti-cheating channel. The device has high integration level, is beneficial to batch production, and reduces the production cost.
The third method comprises the following steps: the second passage is communicated with the fifth passage through a third cheating prevention passage. The integrated level that should set up and make the accessory is high, does benefit to mass production, reduces production and maintenance cost.
The method is as follows: the third channel is communicated with the sixth channel through a fourth anti-cheating channel. The integrated level of the accessories is high through the arrangement, batch production is facilitated, and production and maintenance cost is further reduced.
Of course, in other embodiments, there may be other communication manners arranged so that the gas in the to-be-tested piece can enter the valve body 4, for example, a groove is arranged between the third gas outlet connector 31 and the sixth gas outlet connector 32, and after the third gas outlet connector 31 is communicated with the sixth gas outlet connector 32 and the to-be-tested piece, the groove can communicate the third gas outlet connector 31 and the sixth gas outlet connector 32. The connection between the third air outlet connector 31 and the sixth air outlet connector 32 can be completed by the arrangement of the groove, and the groove is of an open structure, so that the groove is convenient to process, and the production cost is further reduced.
The valve body 4 is used as a gas on-off component and needs to be automatically opened or closed, so that the gas tightness detection of the piece to be detected can be efficiently completed. For this reason, in the present embodiment, the valve body 4 is optionally an electromagnetic valve. The device is convenient for automatically controlling the detection process and improves the detection efficiency.
The embodiment also provides an air tightness detection instrument which comprises the anti-cheating mechanism related to any scheme.
It should be understood that the above-described embodiments of the present invention are merely examples for clearly illustrating the present invention and are not intended to limit the embodiments of the present invention. Other variations and modifications will be apparent to persons skilled in the art in light of the above description. And are neither required nor exhaustive of all embodiments. Any modification, equivalent replacement, and improvement made within the spirit and principle of the present invention should be included in the protection scope of the claims of the present invention.
Claims (10)
1. An anti-cheating mechanism, comprising:
the air inlet pipe comprises a first mounting seat (1), wherein the first mounting seat (1) comprises a test air inlet joint (11), a comparison air inlet joint (12) and a first air outlet joint; the first end of the test air inlet joint (11) is communicated with a tester (200) through a first pipeline (101), the second end of the test air inlet joint (11) is communicated with the first end of the first air outlet joint through a first channel, and the second end of the first air outlet joint is communicated with a port of a piece to be tested; the contrast inlet connector (12) is communicated with the tester (200) through a second pipeline (102);
the valve body (4), the internal gas of the piece to be measured can enter the valve body (4) through the air inlet of the valve body (4);
and the prompting piece is used for prompting that gas passes through the valve body (4).
2. The anti-cheating mechanism according to claim 1, further comprising a second mounting seat (2), said second mounting seat (2) being removably connected to said first mounting seat (1); the second mounting seat (2) is provided with a second air outlet joint, and a first end of the second air outlet joint is communicated with a second end of the first air outlet joint through a second channel; and the second end of the second air outlet joint is communicated with the port of the piece to be detected.
3. The anti-cheating mechanism according to claim 2, further comprising a rubber connecting member (3), wherein the rubber connecting member (3) is detachably connected with the second mounting seat (2), the rubber connecting member (3) comprises a third air outlet joint (31), a first end of the third air outlet joint (31) is communicated with a second end of the second air outlet joint through a third passage, and a second end of the third air outlet joint (31) is communicated with a port of the piece to be detected.
4. The anti-cheating mechanism according to claim 3, wherein said first mounting seat (1) further comprises an anti-cheating joint (13) and a fourth vent joint, said second mounting seat (2) further comprises a fifth vent joint, said rubber connecting member (3) further comprises a sixth vent joint (32);
one end of the anti-cheating joint (13) is communicated with the air inlet through a fourth pipeline (104), and the other end of the anti-cheating joint is communicated with the first end of the fourth air outlet joint through a fourth channel; the second end of the fourth air outlet joint is communicated with the first end of the fifth air outlet joint through a fifth channel, and the second end of the fifth air outlet joint is communicated with the first end of the sixth air outlet joint (32) through a sixth channel; and the second end of the third air outlet joint (31) and the second end of the sixth air outlet joint (32) are communicated with the port of the piece to be tested.
5. Anti-cheating mechanism according to claim 1 or 4, wherein said air intake aperture communicates with said first duct (101) through a first anti-cheating channel.
6. The anti-cheating mechanism of claim 4, wherein said first channel and said fourth channel communicate through a second anti-cheating channel.
7. The anti-cheating mechanism of claim 4, wherein said second passageway communicates with said fifth passageway through a third anti-cheating passageway.
8. The anti-cheating mechanism of claim 4, wherein said third channel communicates with said sixth channel through a fourth anti-cheating channel.
9. The anti-cheating mechanism according to claim 1, wherein said prompting member is a display screen (100), said display screen (100) being electrically connected to said tester (200), said display screen (100) being capable of displaying information that gas passes through said valve body (4).
10. An air-tightness detecting instrument, characterized by comprising an anti-cheating mechanism according to any one of claims 1 to 9.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202011281569.1A CN112393848B (en) | 2020-11-16 | 2020-11-16 | Anti-cheating mechanism and air tightness detection instrument |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202011281569.1A CN112393848B (en) | 2020-11-16 | 2020-11-16 | Anti-cheating mechanism and air tightness detection instrument |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN112393848A CN112393848A (en) | 2021-02-23 |
| CN112393848B true CN112393848B (en) | 2023-03-28 |
Family
ID=74599465
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202011281569.1A Active CN112393848B (en) | 2020-11-16 | 2020-11-16 | Anti-cheating mechanism and air tightness detection instrument |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN112393848B (en) |
Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US4205702A (en) * | 1979-01-24 | 1980-06-03 | Pall Corporation | Flow sensor responsive to fluid leakage flow within a range from above a predetermined minimum to below a predetermined maximum and nonresponsive to fluid leakage flows beyond said range |
| CN101644634A (en) * | 2009-08-25 | 2010-02-10 | 中兴通讯股份有限公司 | Blocking detection method of external circulation air inlet of heat exchanger and system thereof |
| CN102879193A (en) * | 2012-10-26 | 2013-01-16 | 青岛德盛机械制造有限公司 | Blockage pressure-bearing detection device |
| CN214251499U (en) * | 2020-12-31 | 2021-09-21 | 武汉中维德远液压机械有限公司 | Mechanism for detecting blockage state of port of hydraulic valve |
-
2020
- 2020-11-16 CN CN202011281569.1A patent/CN112393848B/en active Active
Patent Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US4205702A (en) * | 1979-01-24 | 1980-06-03 | Pall Corporation | Flow sensor responsive to fluid leakage flow within a range from above a predetermined minimum to below a predetermined maximum and nonresponsive to fluid leakage flows beyond said range |
| CN101644634A (en) * | 2009-08-25 | 2010-02-10 | 中兴通讯股份有限公司 | Blocking detection method of external circulation air inlet of heat exchanger and system thereof |
| CN102879193A (en) * | 2012-10-26 | 2013-01-16 | 青岛德盛机械制造有限公司 | Blockage pressure-bearing detection device |
| CN214251499U (en) * | 2020-12-31 | 2021-09-21 | 武汉中维德远液压机械有限公司 | Mechanism for detecting blockage state of port of hydraulic valve |
Also Published As
| Publication number | Publication date |
|---|---|
| CN112393848A (en) | 2021-02-23 |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| CN113125144B (en) | Self-closing valve test system and test device | |
| CN106679899A (en) | Air duct tightness testing method | |
| CN106338370A (en) | Airtightness detector for puncturing device | |
| CN107367357A (en) | A kind of tightness detector and its detection method | |
| CN108474713A (en) | Injection apparatus and leak detection module | |
| CN201083591Y (en) | Silencer air tightness detection device | |
| CN112393848B (en) | Anti-cheating mechanism and air tightness detection instrument | |
| US20070240493A1 (en) | Sprayer-sniffer probe | |
| CN207946201U (en) | A kind of air-leakage test instrument | |
| CN113654739A (en) | Automatic air tightness detection system and detection method thereof | |
| CN109745604A (en) | Mask and pipeline fall off recognition methods | |
| CN205966710U (en) | Ventilation hood panel air -speed control system | |
| JP3032876B2 (en) | Refueling device | |
| US20150025781A1 (en) | Canister purge valve leak detection system | |
| CN110530582A (en) | A kind of test device for air tightness of vehicle air conditioning outlet | |
| CN205486676U (en) | Gas leak testing system | |
| CN107796574A (en) | A kind of aircraft is airtight to check complex control system and its application method | |
| CN113803863A (en) | Liquid level detection device and air conditioner | |
| CN209764413U (en) | safety valve calibration device | |
| CN111579166A (en) | EVAP system fuel vapor leakage detection device | |
| CN207197742U (en) | A kind of tightness detector | |
| CN215985132U (en) | Pressure testing device | |
| CN206930417U (en) | A kind of test device of respiratory siphon | |
| CN206835379U (en) | A kind of audio amplifier air leak test device | |
| CN212030822U (en) | Leakage tester using standard small hole as leakage reference |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| PB01 | Publication | ||
| PB01 | Publication | ||
| SE01 | Entry into force of request for substantive examination | ||
| SE01 | Entry into force of request for substantive examination | ||
| GR01 | Patent grant | ||
| GR01 | Patent grant |