CN110823468A - One-way valve failure detection device and method for detecting failure of one-way valve - Google Patents
One-way valve failure detection device and method for detecting failure of one-way valve Download PDFInfo
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- CN110823468A CN110823468A CN201911293029.2A CN201911293029A CN110823468A CN 110823468 A CN110823468 A CN 110823468A CN 201911293029 A CN201911293029 A CN 201911293029A CN 110823468 A CN110823468 A CN 110823468A
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- check valve
- reservoir
- liquid
- negative pressure
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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
- G01M3/04—Investigating fluid-tightness of structures by using fluid or vacuum by detecting the presence of fluid at the leakage point
- G01M3/06—Investigating fluid-tightness of structures by using fluid or vacuum by detecting the presence of fluid at the leakage point by observing bubbles in a liquid pool
- G01M3/08—Investigating fluid-tightness of structures by using fluid or vacuum by detecting the presence of fluid at the leakage point by observing bubbles in a liquid pool for pipes, cables or tubes; for pipe joints or seals; for valves; for welds
- G01M3/086—Investigating fluid-tightness of structures by using fluid or vacuum by detecting the presence of fluid at the leakage point by observing bubbles in a liquid pool for pipes, cables or tubes; for pipe joints or seals; for valves; for welds for valves
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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
- G01M3/04—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
- G01M3/224—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 valves
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- Physics & Mathematics (AREA)
- General Physics & Mathematics (AREA)
- Check Valves (AREA)
Abstract
The invention provides a check valve failure detection device, comprising: a sealed reservoir containing a portion of liquid visible from outside the reservoir; one end of the detection pipeline is communicated with a test port of the check valve to be detected, and the other end, opposite to the one end, of the detection pipeline is placed in liquid in the liquid storage tank; a negative pressure source configured to communicate with a gas located in the reservoir to provide negative pressure to the reservoir; the check valve failure detection device can determine the failure of the check valve to be detected through the visual indication given by the check valve to be detected in the liquid storage tank through the detection pipeline. By means of the detection device, whether the check valve fails or not can be judged only by observing visual indication given in liquid of the liquid storage tank, the structure is simple, the requirements on the vacuum degrees of the pressure gauge and the pipeline are lower, observation is more convenient and visual, and the whole detection time is short. The invention also provides a method for detecting the failure of the one-way valve.
Description
Technical Field
The invention relates to the field of one-way valve failure detection, mainly relates to a one-way valve failure detection device, and further relates to a method for detecting failure of a one-way valve.
Background
Check valves, which may also be referred to as check valves or back-pressure valves, are commonly used in hydraulic or pneumatic systems to prevent the reverse flow of oil or gas. For the aerospace field, if any check valve provided on an aircraft fails, it can lead to serious damage incidents inside the aircraft system. To prevent the risk of failure of the working check valve, it is often necessary to check it rigorously.
The check valve detection on the market at present generally adopts a pipeline positive pressure inflation detection method, namely, an external positive pressure air source is connected to a detection port of a pipeline system, the pressure value allowed by a pipeline is set, the positive pressure air source is closed, and after pressure maintaining is carried out for a period of time, the change of the front and back values of the pipeline pressure of the system is compared to judge whether the check valve of the system fails or not.
For example, a method for checking a non-return valve is known from CN 102507109B. Firstly, inputting a positive pressure starting parameter, connecting a tested rubber tube to a pressure sensor in a positive direction, and blocking the other end of the tested rubber tube; starting an operation button, and detecting and starting the forward opening of the one-way valve; the air source system charges positive pressure to the positive opening loop, and the alarm alarms that the pressure is abnormal when the pressure changes to the pressure charging limit value within the pressure charging time; in the pressurizing time, the pressure of the rubber tube is reduced to an opening set value, the rubber tube is proved to be opened in the forward direction, and the time required for opening is detected; and when the pressurizing time is exceeded, the pressure of the rubber tube is not reduced to the opening set value, the rubber tube is not opened in the forward direction, and the alarm of the alarm device fails to detect.
However, for the above-mentioned conventional check valve positive pressure detection, there are disadvantages that the time required for detection is long, the detection and judgment are not intuitive, the requirement for an inflation source is high, and the like, and thus the application range is limited.
For another example, CN 207741907U discloses a rubber tube check valve detecting device, which realizes the detection of the performance of two aspects of the check valve, that is, the sealing performance of the check valve is detected by the air suction of a vacuum pump and the ventilation performance of the check valve is detected by the compressed air filled. The two detections are both used for judging whether the one-way valve is sealed or not through the pressure change value detected by the pressure sensor.
However, the above-described sensing device requires a high cost pressure sensor and a complicated circuit design, and thus cannot meet the requirements of various applications, particularly where it is necessary to quickly determine whether a check valve has failed.
Accordingly, there is a continuing need in the art for a simple and low cost structure and intuitive method for quickly detecting if a check valve in a system line has failed.
Disclosure of Invention
The invention provides a check valve failure detection device, comprising: a sealed reservoir containing a portion of liquid visible from outside the reservoir; one end of the detection pipeline is communicated with a test port of the check valve to be detected, and the other end, opposite to the one end, of the detection pipeline is placed in liquid in the liquid storage tank; a negative pressure source configured to communicate with a gas located in the reservoir to provide negative pressure to the reservoir; the check valve failure detection device can determine the failure of the check valve to be detected through visual indication given by the check valve to be detected in liquid in the liquid storage tank through the detection pipeline.
With the help of the detection device, the failure of the one-way valve can be judged by only observing the visual indication given in the liquid of the liquid storage tank, obviously, the detection device has simple structure, obviously lower requirements on the vacuum degree of the pressure gauge and the pipeline, more convenient and visual observation, short whole detection time and very convenient operation of detection personnel.
Preferably, the visual indication may comprise an air bubble present in the liquid. It is also preferred that the liquid is water and the visual indication may comprise oil present in the water.
Under the action of suction, when the check valve to be detected fails, whether oil or gas is discharged from the liquid pre-filled in the liquid storage tank or not is easily observed, and whether the check valve fails or not is analyzed and judged accordingly. The observation mode is simple and clear, can be realized without other professional pressure detection tools, and has excellent field operability.
It is particularly advantageous if at least a part of the detection line is made of a transparent material. Thus, in addition to the visual change of the liquid in the liquid storage tank, the visual change can be observed from the detection pipeline, so that the detection responsiveness is improved, and a detection person can predict that the one-way valve may fail in a shorter detection time.
In some embodiments, a negative pressure line may be disposed between the reservoir and the source, with a one-way valve disposed on the negative pressure line to control reliable fluid (e.g., air) flow between the reservoir and the source, avoiding damage to either.
In addition, a vacuum pressure valve can be arranged on the liquid storage tank to prevent the pressure in the liquid storage tank from being overlarge.
For example, the negative pressure source may be configured as a vacuum generator to detect the check valve to be detected in a negative pressure manner without the need for complicated equipment in the positive pressure detection.
In addition, a pressure reducing valve can be arranged on the negative pressure pipeline to adjust the pressure in the liquid storage tank, so that the negative pressure value required by adjustment and detection can be realized at lower cost.
Preferably, the detection line is configured as a transparent hose. In particular, a ball valve is also arranged on the detection pipeline. The transparent hose makes the whole detection equipment more flexible in arrangement, and the setting of ball valve is favorable to safety control and flow control in the detection process to can see the most clear visual indication in the liquid storage pot.
Finally, the present invention also provides a method for detecting a failure of a check valve, comprising: providing a sealed reservoir containing a portion of the liquid therein, the liquid being visible from outside the reservoir; communicating one end of a detection pipeline with a test port of a check valve to be detected, and placing the other end, opposite to the one end, of the detection pipeline in the liquid storage tank; communicating a negative pressure source with the gas in the reservoir to provide negative pressure to the reservoir; after the negative pressure source is started, when the one-way valve to be detected gives a visual indication in the liquid storage tank through the detection pipeline, the failure of the one-way valve to be detected can be determined.
Generally speaking, the detection device and the detection method of the invention use the compressed air source and the vacuum generator to enable the detected system to generate negative pressure, detect the airtightness of the one-way valve of the hydraulic or pneumatic system through the suction effect, do not input any air source to the pipeline system, do not use electrical equipment, have explosion-proof safety requirements and have high safety.
In addition, the vacuum liquid storage tank is preferably made of transparent materials, liquid such as water is pre-filled in the liquid storage tank before use, whether the one-way valve fails or not is judged by observing whether bubbles or oil is discharged from a negative pressure pipeline introduced into the water, and the detection method is simple and visual and is more reliable and visual than a mode of reading pressure value change.
Drawings
FIG. 1 shows a schematic diagram of a check valve failure detection arrangement according to the present invention;
FIG. 2 shows a schematic block diagram of a check valve failure detection arrangement according to an embodiment of the present invention;
figure 3 shows a schematic of the structure of one example of a test application for the present invention.
It should be noted that the drawings referred to are not all drawn to scale but may be exaggerated to illustrate aspects of the present invention, and in this regard, the drawings should not be construed as limiting.
List of reference numerals:
100 one-way valve failure detection device
200 oil tanks;
350 a first test port;
450 a second test port;
300 a first one-way valve;
400 a second one-way valve;
110 a source of negative pressure;
120 a one-way valve;
130 liquid storage tank;
140 a pressure reducing valve;
150 ball valve;
160 pressure gauge;
170 a joint;
180 a transparent hose;
190 vacuum pressure valve;
500 trolley.
Detailed Description
In the present invention, the check valve failure detection means refers to a device or apparatus for detecting whether or not a check valve has failed. When the check valve is not disabled, the check valve may be opened under fluid action in one flow direction (i.e., the pressure at the inflow end is higher than the pressure at the other end), while the check valve remains closed under fluid action in the opposite flow direction.
If the check valve fails due to failure of its seal or mechanical/hydraulic components of the check valve itself, the check valve may fail to maintain the intended shutoff, thereby resulting in the reverse direction being able to be switched on. The present invention is primarily concerned with this failure mode of the check valve.
In the present invention, the check valve to be tested provides a test port that communicates with the first end of the check valve. When the pressure at a first end of the fluid circuit is lower than an opposite second end of the check valve, the check valve is non-conductive (i.e., remains off) if it does not fail. But if the check valve fails it may be caused to conduct at that time. It is understood that a test port within the meaning of the present invention may also be directly one end (e.g., the first end described above) of the check valve to be tested.
As exemplarily shown in fig. 3, the check valve failure detection apparatus according to the present invention may be used in an aircraft fuel system (see, for example, the fuel tank 200 shown in the drawings). In this example, two first and second check valves 300 and 400 to be tested are shown. Each of the first and second test ports 350 and 450 may be connected to a check valve failure detection device to detect whether the check valves 300 and 400 have failed (see below for specific steps).
The check valve failure detection arrangement according to the present invention includes a sealed fluid reservoir 130. As used herein, the term "sealed" means that the interior of the fluid reservoir 130 is sealed from the environment outside of the fluid reservoir, but does not preclude the fluid reservoir 130 from being in fluid communication with other piping or equipment through some of its ports. It will be appreciated that the sealed reservoir 130 is isolated from the ambient atmosphere.
The tank 130 contains a portion of the liquid therein (e.g., occupying one-third to one-half of the volume of the tank 130), but typically the liquid does not fill the entire tank 130 to provide a gas pressure (e.g., atmospheric pressure) above the liquid.
In particular, the liquid within reservoir 130 should be visible from outside reservoir 130, but it should be understood that this does not necessarily require that reservoir 130 be completely transparent, but rather, to the extent that any changes in the liquid and any changes in the liquid are visible from outside (e.g., the material of reservoir 130 may be clear plastic, tinted glass, etc.).
The liquid in reservoir 130 is preferably water, as water is readily available and inexpensive during the experiment. In addition, since water is transparent, when the check valve to be detected is connected to, for example, a pipe of an aircraft fuel system, a water-insoluble substance such as fuel or the like may flow into the water. At this time, if the liquid is water or other transparent liquid, it is very convenient for the experimenter to observe.
The check valve failure detection device further comprises a detection pipeline. At least a part of the detection pipe is preferably a pipe made of a transparent material, in particular, a transparent hose 180. The transparent material facilitates the immediate and clear observation of visual changes due to one-way valve failure during the course of the experiment (such visual changes will be described in detail below). The transparent hose 180 facilitates flexible arrangement of the whole detection device and reduces the detection cost.
One end of the detection pipeline can be communicated (mainly, fluid communication) with the test port of the check valve to be detected. It is understood that in the embodiment shown in fig. 2, additional fittings 170 or ball valves 150 may be included between the test lines and the test ports to more flexibly adjust the testing process (e.g., on-off testing, etc.) as desired.
The other end of the detection line is disposed in the liquid reservoir 130. For example, as shown in FIG. 2, the other end of the detection line extends into the water inside the tank 130 through a hole provided on the top thereof, i.e., the other end of the detection line is submerged in the water. It will be appreciated that the reservoir 130 will not lose its aforementioned seal due to the penetration of the detection line (e.g., through a lid or sidewall of the reservoir 130).
For the detection of the one-way valve, the one-way valve failure detection device according to the invention further comprises a source of negative pressure 110, preferably a vacuum generator. The negative pressure source 110 is placed in communication with a gas (e.g., air above water) located in the reservoir 130 to provide the desired negative pressure to the reservoir 130.
Advantageously, a negative pressure line may be disposed between reservoir 130 and negative pressure source 110. As shown in fig. 2, a check valve 120 is provided on the negative pressure line. The check valve 120 is a check valve that is qualified for detection and is not a check valve to be detected. The one-way valve 120 is configured to allow air within the reservoir 130 to be drawn toward the source of negative pressure 110 to reduce the pressure within the reservoir 130 without allowing air within the line between the one-way valve 120 and the source of negative pressure 110 to be drawn back into the reservoir 130.
In addition, a (vacuum) pressure relief valve 140 may be provided on the negative pressure line to regulate the pressure in the reservoir 130.
In addition, a vacuum pressure valve 190 may be provided for the reservoir 130 to prevent excessive pressure in the reservoir 130 from causing testing accidents. The threshold value of the vacuum pressure valve 190 may be learned from empirical values of the detection process or subject to any legal regulations.
The entire set of one-way valve failure detection devices shown in fig. 2 may be disposed on the cart 500 and conveniently moved to any location where detection is desired.
Hereinafter, the detection process performed by the check valve failure detection device according to the present invention will be described in detail with reference to an example.
First, the liquid is poured into the liquid storage tank 130 and sealed to form the liquid storage tank 130 sealed from the environment.
Then, one end of the detection pipeline is communicated with the test port of the check valve to be detected, and the other end of the detection pipeline opposite to the end is placed in the liquid storage tank 130 (the height or the immersion depth of the detection pipeline in the liquid storage tank 130 can be manually adjusted by a detection person).
Subsequently, the negative pressure source 110, which is in communication with the gas located in the reservoir 130, is activated to begin providing negative pressure (i.e., drawing a vacuum) into the reservoir 130.
During this time, the pressure relief valve 140 on the negative pressure line to the negative pressure source 110 may also be adjusted to vary the amount of pressure in the reservoir 130 as desired. In addition, when the negative pressure in the reservoir 130 exceeds the maximum set value, the vacuum relief valve may also draw in air to prevent the negative pressure from being excessive.
The pressure of the fluid reservoir 130 may gradually decrease as the negative pressure source 110 provides negative pressure (i.e., a certain vacuum) to the fluid reservoir 130. When the check valve to be tested, which is connected to the test line via the test port, fails, e.g., the check valve fails to maintain a normally closed state, a visual indication may be provided in the liquid, e.g., water, of the reservoir 130.
A "visual indication" within the meaning of the present invention is for example a bubble present in the liquid. This is because the check valve fails to maintain a proper shut-off, and thus in the event that the pressure within the reservoir 130 drops to a certain level (e.g., significantly less than atmospheric pressure), air may flow into the liquid within the reservoir 130 through the test port of the check valve and then through one end of the test line (shown at the upper end fitting 170 in fig. 2), creating air bubbles, particularly persistent air bubbles.
In another case, for example when the check valve to be detected is used in an aircraft fuel system, there may also be a liquid, in particular transparent water, which falls from the fuel system via the detection line into the reservoir 130. Thus, upon the presence of oil in the fluid in reservoir 130 (which fluid cannot normally be oil), it may be determined that the check valve is failed.
Since the test line itself is preferably transparent and the liquid in the reservoir 130 is also preferably transparent water, if the check valve to be tested fails, it is easy to immediately determine a visual indication such as a bubble or oil drop as described above by the set of test devices. In particular, can be not only in the reservoir 130
It should be understood that the "visual indication" in the present invention is not limited to the above-mentioned bubbles or oil drops, but is within the scope of the present invention as long as the change (which may be different depending on the system in which the check valve is located, for example, not oil, but other colored liquid, etc.) can be visually observed.
Generally, the detection device realizes the detection of the check valve of a hydraulic or pneumatic system by a negative pressure suction principle. In the detection method of the invention, only the liquid storage tank 130 and the detection pipeline (discharge condition) need to be observed to judge whether the liquid storage tank is invalid or not, obviously, the detection device has simple structure, obviously lower requirements on the pressure gauge 160 and the vacuum degree of the pipeline, more convenient and visual observation, short whole detection time and convenient operation of detection personnel.
In the following, reference is made to fig. 3 to further how the check valve failure detection arrangement according to the invention is applied in an aircraft fuel system to detect if two check valves in series in the system fail.
a) Opening the first test port 350 (e.g., unscrewing its plug), connecting the fitting 170 of the test device 100 to the first test port 350;
b) closing the ball valve 150 (if any) located at the front end of the detection device 100;
c) slowly turning on the negative pressure source 110 to start vacuum pumping;
d) observing the pressure gauge 160 on the liquid storage tank 130, and slowly adjusting the pressure reducing valve 140 to make the system pressure be the pressure value set by detection;
e) opening ball valve 150 (if any), observing the reading of pressure gauge 160, and if the reading stabilizes at the set pressure value, turning off negative pressure source 110;
f) observing whether fuel is discharged from the transparent hose 180 or whether bubbles are continuously emitted from the liquid (for example, water) in the liquid storage tank 130, if fuel is discharged or bubbles are continuously emitted, both the first check valve 300 and the second check valve 400 fail, the detection is finished, otherwise, the next step is executed;
g) opening the second test port 450 (e.g., unscrewing its plug) to place the first check valve reverse shut off end in communication with the outside air; then, the first detection end 350 is sucked according to the steps, whether bubbles continuously emerge from the liquid in the liquid storage tank 130 or not is observed, and if bubbles continuously emerge, the first one-way valve 300 is disabled; otherwise, the first check valve 300 is normal.
h) The first check valve 300 is detected, and the negative pressure source 110 is closed.
i) The connector 170 of the detection device is removed and connected with the second test port 450, the first test port 350 is screwed by a plug, and then whether fuel is discharged from the transparent hose 180 or whether bubbles are continuously discharged from the liquid in the liquid storage tank 130 is observed according to the operation of the steps b) to e), if so, the second check valve 400 is disabled, otherwise, the second check valve 400 is normal.
Although various embodiments of the present invention have been described with reference to one detection arrangement layout shown in fig. 1-2, it should be understood that embodiments within the scope of the present invention may also be applied to other check valve failure detection devices having similar structures and/or functions.
The foregoing description has set forth numerous features and advantages, including various alternative embodiments, as well as details of the structure and function of the devices and methods. The intent herein is to be exemplary and not exhaustive or limiting.
It will be obvious to those skilled in the art that various modifications may be made, especially in matters of structure, materials, elements, components, shape, size and arrangement of parts including combinations of these aspects within the principles described herein, as indicated by the broad, general meaning of the terms in which the appended claims are expressed. To the extent that such various modifications do not depart from the spirit and scope of the appended claims, they are intended to be included therein as well.
Claims (10)
1. A check valve failure detection apparatus (100), comprising:
a sealed reservoir (130), a portion of the liquid being contained within the reservoir (130);
one end of the detection pipeline is communicated with a test port of the check valve to be detected, and the other end, opposite to the one end, of the detection pipeline is placed in the liquid storage tank (130);
a negative pressure source (110), the negative pressure source (110) being arranged to communicate with a gas located in the liquid reservoir (130) to provide a negative pressure to the liquid reservoir (130);
wherein the check valve failure detection device (100) is capable of determining a failure of the check valve to be detected by a visual indication of the check valve to be detected given in the liquid of the liquid reservoir (130) via the detection line.
2. The check valve failure detection device (100) of claim 1, wherein at least a portion of the detection line is constructed of a transparent material.
3. The check valve failure detection device (100) of claim 1, wherein the visual indication comprises an air bubble present in the liquid.
4. The check valve failure detection device (100) of claim 1, wherein the liquid is water and the visual indication comprises oil present in the water.
5. The check valve failure detection device (100) of claim 1, wherein a negative pressure line is arranged between the reservoir (130) and the negative pressure source (110), on which a check valve (120) is arranged.
6. The check valve failure detection device (100) of claim 1, wherein a vacuum pressure valve (190) is provided on the fluid reservoir (130) to prevent excessive pressure in the fluid reservoir (130).
7. The check valve failure detection device (100) of claim 1, wherein the negative pressure source (110) is configured as a vacuum generator.
8. The check valve failure detection device (100) of claim 5, wherein a pressure relief valve (140) is provided on the negative pressure line to regulate the amount of pressure in the reservoir (130).
9. The check valve failure detection device (100) of claim 2, wherein the detection line is configured as a transparent hose (180) and a ball valve (150) is further disposed on the detection line.
10. A method for detecting a one-way valve failure, comprising:
providing a sealed liquid storage tank (130), and accommodating part of liquid in the liquid storage tank (130);
communicating one end of a detection pipeline with a test port of a check valve to be detected, and placing the other end, opposite to the one end, of the detection pipeline in the liquid storage tank (130);
communicating a source of negative pressure (110) with a gas located in the reservoir (130) to provide negative pressure to the reservoir (130);
upon activation of the negative pressure source (110), a failure of the one-way valve to be detected can be determined when the one-way valve to be detected gives a visual indication in the liquid of the liquid reservoir (130) via the detection line.
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201911293029.2A CN110823468A (en) | 2019-12-16 | 2019-12-16 | One-way valve failure detection device and method for detecting failure of one-way valve |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201911293029.2A CN110823468A (en) | 2019-12-16 | 2019-12-16 | One-way valve failure detection device and method for detecting failure of one-way valve |
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| CN110823468A true CN110823468A (en) | 2020-02-21 |
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| CN201911293029.2A Pending CN110823468A (en) | 2019-12-16 | 2019-12-16 | One-way valve failure detection device and method for detecting failure of one-way valve |
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN111387831A (en) * | 2020-04-29 | 2020-07-10 | 珠海格力电器股份有限公司 | Cooking utensil and self-checking method thereof |
| CN111693218A (en) * | 2020-07-15 | 2020-09-22 | 江铃汽车股份有限公司 | Device for detecting leakage of drive axle ventilation structure |
| CN113864647A (en) * | 2021-09-27 | 2021-12-31 | 广州文冲船厂有限责任公司 | Gas backflow partition device of marine gas supply system |
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| CN101881689A (en) * | 2010-06-30 | 2010-11-10 | 奇瑞汽车股份有限公司 | Large-capacity power lithium-ion battery sealing-performance testing equipment and test method thereof |
| CN108225682A (en) * | 2018-04-11 | 2018-06-29 | 四川澳维采油设备有限公司 | A kind of valve secondary sealing detection device and detection method |
| CN209069518U (en) * | 2018-09-05 | 2019-07-05 | 上海威克特航空地面设备有限公司 | A kind of check valve tightness measuring device for aircraft pipeline |
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| TW293086B (en) * | 1995-06-26 | 1996-12-11 | Shimatsu Seisakusho Kk | |
| CN101881689A (en) * | 2010-06-30 | 2010-11-10 | 奇瑞汽车股份有限公司 | Large-capacity power lithium-ion battery sealing-performance testing equipment and test method thereof |
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Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN111387831A (en) * | 2020-04-29 | 2020-07-10 | 珠海格力电器股份有限公司 | Cooking utensil and self-checking method thereof |
| CN111387831B (en) * | 2020-04-29 | 2021-09-14 | 珠海格力电器股份有限公司 | Cooking utensil and self-checking method thereof |
| CN111693218A (en) * | 2020-07-15 | 2020-09-22 | 江铃汽车股份有限公司 | Device for detecting leakage of drive axle ventilation structure |
| CN113864647A (en) * | 2021-09-27 | 2021-12-31 | 广州文冲船厂有限责任公司 | Gas backflow partition device of marine gas supply system |
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Application publication date: 20200221 |