An on-site airtightness detection device for a leakage collector

Abstract

An on-site airtightness detection device for a leakage collector disclosed by the present invention includes: a first flowmeter having a first air inlet and a first air outlet; a second flowmeter having a second air inlet and a second air outlet; a three-way joint, the first interface of the three-way joint is connected to the first air outlet of the first flowmeter, its second interface is connected to the second air inlet of the second flowmeter, and its third interface is connected to the air outlet end of the leak guide pipe of the leakage collector; and a gas supply mechanism, the air outlet of the gas supply mechanism is connected to the first air inlet of the first flowmeter. The present invention can detect whether the airtightness of the leakage collector meets the standard, and is convenient to use, easy to carry, fast in detection, high in accuracy, and low in cost.

Description

Technical Field

[0001] The present invention relates to the technical field of airtightness detection equipment, and particularly to an on-site airtightness detection device for a leakage collector. Background Art

[0002] At present, as the country pays more and more attention to the safety of the petrochemical industry, some large petrochemical enterprises have installed leakage monitoring devices on pipeline flanges, such as bag-type leakage collectors. This device is mainly wrapped around the pipeline flange to collect the leaked gas at the pipeline flange. Its main purpose is to prevent problems before they occur. Most pipeline flanges do not leak during installation, but may leak later. Therefore, if the pipeline flange does not leak during installation, it is difficult to verify the effect of the bag-type leakage collector. The installation of the leakage collector varies from person to person. If the installation is not standardized enough, it is easy to cause poor sealing performance of the leakage collector, thus failing to play the role of collecting leaked gas.

[0003] The existing airtightness detection methods for leakage collectors mainly include soap foam coating method, ultrasonic detection method, and pressure drop method, etc. These detection methods have the following defects:

[0004] 1. At present, most tools for detecting airtightness are large in volume and not easy to carry. They can only be operated in the laboratory, with poor mobility and are not suitable for outdoor work;

[0005] 2. At present, most tools for detecting airtightness need to be powered on or installed with batteries to be used and do not have the function of fire and explosion prevention. Such tools cannot be used in flammable and explosive occasions;

[0006] 3. The detection accuracy of the soap foam coating method is relatively low. It can only roughly judge whether the leakage collector leaks air and cannot truly reflect the airtightness performance of the leakage collector. Moreover, this type of airtightness detection method can only be completed on the premise that the pressure vessel leaks and the leakage collector collects the gas. If the pressure vessel does not leak, this type of method loses its detection function;

[0007] 4. The ultrasonic detection method can only be detected when the pressure vessel leaks and the leakage collector collects the gas. Moreover, the detection object is generally a high-sealing device and is not suitable for a low-sealing device such as a leakage collector. In addition, the equipment cost of this detection method is relatively high;

[0008] 5. The pressure drop method is to introduce pressure gas into the leakage collector and then connect a pressure gauge to observe the pressure decay time. The detection accuracy of this method is relatively low, and the leakage collector itself does not have high sealing performance. The introduced pressure may drop to zero instantly and cannot be effectively distinguished.

[0009] To this end, the applicant has conducted beneficial explorations and attempts and found a solution to the above problems. The technical solution to be introduced below was developed under this background. Summary of the Invention

[0010] The technical problem to be solved by the present invention is: in view of the deficiencies existing in the existing airtightness detection method for leak collectors, to provide an on-site airtightness detection device for leak collectors with high detection efficiency, good detection accuracy, low manufacturing cost, and convenient portability.

[0011] The technical problem to be solved by the present invention can be achieved by adopting the following technical solutions:

[0012] An on-site airtightness detection device for a leak collector, comprising:

[0013] A first flowmeter, the first flowmeter having a first air inlet and a first air outlet;

[0014] A second flowmeter, the second flowmeter having a second air inlet and a second air outlet;

[0015] A three-way joint, a first interface of the three-way joint being connected to the first air outlet of the first flowmeter, a second interface thereof being connected to the second air inlet of the second flowmeter, and a third interface thereof being connected to the air outlet end of the leak guide tube of the leak collector; and

[0016] An air supply mechanism, an air outlet of the air supply mechanism being connected to the first air inlet of the first flowmeter.

[0017] In a preferred embodiment of the present invention, the first flowmeter and / or the second flowmeter is a rotameter.

[0018] In a preferred embodiment of the present invention, the first flowmeter and the second flowmeter have the same specifications.

[0019] In a preferred embodiment of the present invention, it further includes first and second connecting pipes. One end of the first connecting pipe is connected to the first air outlet of the first flowmeter through a first quick-release sealing joint, and the other end thereof is connected to the first interface of the three-way joint through a second quick-release sealing joint. One end of the second connecting pipe is connected to the second air inlet of the second flowmeter through a third quick-release sealing joint, and the other end thereof is connected to the second interface of the three-way joint through a fourth quick-release sealing joint.

[0020] In a preferred embodiment of the present invention, the first and second connecting pipes are both metal connecting pipes.

[0021] In a preferred embodiment of the present invention, it further includes a third connecting pipe. One end of the third connecting pipe is connected to the third interface of the three-way joint through a fifth quick-connect sealing joint, and the other end is connected to the air outlet end of the leak guide pipe of the leak collector through a sixth quick-connect sealing joint.

[0022] In a preferred embodiment of the present invention, the third connecting pipe is a PU hose.

[0023] In a preferred embodiment of the present invention, the air supply mechanism is a micro gas cylinder or a manual air pump with an inflation needle.

[0024] Due to the adoption of the above technical solutions, the beneficial effects of the present invention are as follows: The present invention can detect whether the sealing performance of the leak collector meets the standard, and it is convenient to use, easy to carry, fast in detection, high in accuracy, and low in cost. The present invention does not require a power source or battery installation, is suitable for flammable and explosive chemical occasions, and will not have any impact on the product after testing. BRIEF DESCRIPTION OF THE DRAWINGS

[0025] In order to more clearly illustrate the technical solutions in the embodiments of the present invention or the prior art, the following will briefly introduce the drawings required for use in the description of the embodiments or the prior art. Obviously, the drawings in the following description are only some embodiments of the present invention. For those of ordinary skill in the art, without creative efforts, other drawings can also be obtained based on these drawings.

[0026] Figure 1 is a schematic diagram of the cooperative connection between the present invention and the leak collector.

[0027] Figure 2 is a three-dimensional structure diagram of one perspective of the present invention (without the air supply mechanism).

[0028] Figure 3 is a three-dimensional structure diagram of another perspective of the present invention (without the air supply mechanism).

[0029] Figure 4 is a simplified connection diagram of the present invention. DETAILED DESCRIPTION OF THE EMBODIMENTS

[0030] In order to make the technical means, creative features, achieved purposes and functions of the present invention easy to understand, the present invention will be further described below with reference to specific drawings.

[0031] See Figures 1 to 4 , what is shown in the figure is an on-site airtightness detection device for a leak collector, including flow meters 100a, 100b, a three-way joint 200, and an air supply mechanism 300.

[0032] The flow meter 100a has an air inlet 110a and an air outlet 120a. The flow meter 100b has an air inlet 110b and an air outlet 120b. In this embodiment, the flow meters 100a and 100b are preferably float flow meters, and the specifications of the flow meters 100a and 100b are the same. Further, the range of the flow meters 100a and 100b is 141.5ml, the resolution is 1ml / scale, the tube length is 150mm, and the accuracy is ±2%.

[0033] The first interface 210 of the three-way joint 200 is connected to the air outlet 120a of the flow meter 100a, the second interface 220 is connected to the air inlet 110b of the flow meter 100b, and the third interface 230 is connected to the air outlet end of the leakage pipe 11 of the leakage collector 10 installed on the pipeline flange 1.

[0034] The air outlet of the air supply mechanism 300 is connected to the air inlet 110a of the flow meter 100a. In this embodiment, the air supply mechanism 300 can be a miniature gas cylinder or a manual air pump with an air-inflating needle.

[0035] The air tightness field detection device for the leakage collector of the present invention also includes connecting pipes 400a and 400b, one end of the connecting pipe 400a is connected to the air outlet 120a of the flow meter 100a through a quick-install sealing joint 510, and the other end thereof is connected to the first interface 210 of the three-way joint 200 through a quick-install sealing joint 520, one end of the connecting pipe 400b is connected to the air inlet 110b of the flow meter 100b through a quick-install sealing joint 530, and the other end thereof is connected to the second interface 220 of the three-way joint 200 through a quick-install sealing joint 540. In this embodiment, the connecting pipes 400a and 400b are both metal connecting pipes. In this way, the flow meters 100a and 100b are connected to the three-way joint 200 using the connecting pipes 400a and 400b made of metal, which can ensure the sealing of the system, and can also make the flow meters 100a and 100b play a fixing role, so that no relative displacement occurs during movement or detection, thereby ensuring the detection accuracy.

[0036] The air tightness field detection device for the leakage collector of the present invention further includes a connecting pipe 400c, one end of which is connected to the third interface 230 of the three-way joint 200 through a quick-install sealing joint 550, and the other end of which is connected to the gas outlet end of the leakage guide pipe 11 of the leakage collector 10 through a quick-install sealing joint 560. In this embodiment, the connecting pipe 400c preferably adopts a PU hose to facilitate connection with the leakage guide pipe 11 of the leakage collector 10.

[0037] See also Figure 4 Combined with Figure 1, in the present invention, a tee joint 200 is connected to the leak conduit 11 of the leak collector 10. The pressurized gas generated by the gas supply mechanism 300 enters the flowmeter 100a through the inlet 110a of the flowmeter 100a. The flowmeter 100a detects the flow rate of the pressurized gas in real time. The pressurized gas enters the tee joint 200 through the outlet 120a of the flowmeter 100a. At this time, due to the pipe resistance, the pressurized gas will enter the leak collector 10 through the leak conduit 11 of the leak collector 10 and fill the leak collector 10, and then enter the flowmeter 100b through the tee joint 200. At this time, the flowmeter 100b detects the real-time flow rate of the pressurized gas, and finally the pressurized gas is discharged through the outlet 120b of the flowmeter 100b. Assume that the leak collector 10 has a very strong sealing effect, and all the input pressurized gas (input flow rate A) is collected by the leak collector 10 without leakage and then all flows out as the output flow rate B. At this time, if it is measured that (output flow rate B / input flow rate A) = 100%, it can be proved that this leak collector 10 can collect 100% of the input gas. If the pressure vessel leaks, this leak collector 10 can work normally and collect all the leaks of the pressure vessel to the leak conduit 11 and lead them out.

[0038] Because most leak collectors have only one leak conduit and cannot intake and exhaust gas on both sides for intuitive detection. Therefore, the present invention uses the tee joint 200 to connect to the leak port 11. Since the gas flowing in the pipeline will preferentially flow into the area with small pipe resistance, assume that nothing is connected to interface B and the pipe resistance at this time is zero. The leak collector connected to interface C is an annular space, and the pipe resistance of interface C is greater than that of interface B. Then the pressurized gas will flow directly from interface A to interface B without passing through interface C. If a flowmeter 100b is connected to interface B, due to the working principle of the flowmeter 100b, its pipe resistance is much greater than that of the leak collector 10. At this time, the pipe resistance of interface B is greater than that of interface C, and the pressurized gas will first enter interface C, enter the leak collector 10, and then flow out from interface B.

[0039] See Figure 4 , the flowmeter 100a displays the input flow rate A, the flowmeter 100b displays the output flow rate B, and all the gas flowing out of the flowmeter 100a enters the flowmeter 100b. Theoretically, if the connected leak collector 10 or the sealed container has good sealing performance, then there is no loss of the input pressurized gas, and the output flow rate B is equal to the input flow rate A. If there is a leak in the leak collector 10, then a part of the input pressurized gas will be lost, and the output flow rate B < the input flow rate A. The input flow rate A minus the output flow rate B is the flow rate of the leak of the collector 10.

[0040] For example, during testing, assume that flowmeter 100b shows a flow rate of 90 ml / min and flowmeter 100a shows 100 ml / min. Then, the collection efficiency of leak collector 10 is 90 / 100 = 90%; for example, if flowmeter 100b shows a flow rate of 100 ml / min and flowmeter 100a shows 100 ml / min, then the collection efficiency of this leak collector 10 is 100 / 100 = 100%. At this time, it indicates that the tested leak collector has achieved a completely sealed effect.

[0041] The foregoing has shown and described the basic principles, main features, and advantages of the present invention. Those skilled in the art should understand that the present invention is not limited by the above embodiments. The above embodiments and the descriptions in the specification merely illustrate the principles of the present invention. Without departing from the spirit and scope of the present invention, the present invention will have various changes and improvements, and all these changes and improvements fall within the scope of the present invention claimed. The scope of protection of the present invention is defined by the appended claims and their equivalents.

Claims

1. An on-site airtightness detection device for a leakage collector, characterized in that, it includes: A first flowmeter, which has a first air inlet and a first air outlet; A second flowmeter, which has a second air inlet and a second air outlet; A three-way joint, the first interface of which is connected to the first air outlet of the first flowmeter, the second interface of which is connected to the second air inlet of the second flowmeter, and the third interface of which is connected to the air outlet end of the leakage guide pipe of the leakage collector; and A gas supply mechanism, the air outlet of which is connected to the first air inlet of the first flowmeter; The pressurized gas generated by the gas supply mechanism enters the first flowmeter through the first air inlet of the first flowmeter. The first flowmeter real-time detects the flow rate of the pressurized gas. The pressurized gas enters the three-way joint through the first air outlet of the first flowmeter. At this time, due to pipe resistance, the pressurized gas will enter the leakage collector through the leakage guide pipe of the leakage collector and fill the leakage collector, and then enter the second flowmeter through the three-way joint. At this time, the second flowmeter performs real-time flow detection on the pressurized gas, and finally the pressurized gas is discharged through the air outlet of the second flowmeter.

2. The on-site airtightness detection device for a leakage collector according to claim 1, characterized in that, The first flowmeter and / or the second flowmeter is a rotameter.

3. The on-site airtightness detection device for a leakage collector according to claim 2, characterized in that, The first flowmeter and the second flowmeter have the same specifications.

4. The on-site airtightness detection device for a leakage collector according to claim 1, characterized in that, It further includes first and second connecting pipes. One end of the first connecting pipe is connected to the first air outlet of the first flowmeter through a first quick-release sealing joint, and the other end is connected to the first interface of the three-way joint through a second quick-release sealing joint. One end of the second connecting pipe is connected to the second air inlet of the second flowmeter through a third quick-release sealing joint, and the other end is connected to the second interface of the three-way joint through a fourth quick-release sealing joint.

5. The on-site airtightness detection device for a leakage collector according to claim 4, characterized in that, The first and second connecting pipes are both metal connecting pipes.

6. The on-site airtightness detection device for a leakage collector according to claim 1, characterized in that, It further includes a third connecting pipe. One end of the third connecting pipe is connected to the third interface of the three-way joint through a fifth quick-release sealing joint, and the other end is connected to the air outlet end of the leakage guide pipe of the leakage collector through a sixth quick-release sealing joint.

7. The on-site airtightness detection device for a leakage collector according to claim 6, characterized in that, The third connecting pipe is a PU hose.

8. The on-site airtightness detection device for a leakage collector according to any one of claims 1 to 7, characterized in that, The gas supply mechanism is a micro-miniature gas cylinder or a manual air pump with a inflation needle.

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