CN115683757A - Soil gas monitoring well gas tightness test integrate device - Google Patents
Soil gas monitoring well gas tightness test integrate device Download PDFInfo
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- CN115683757A CN115683757A CN202211323057.6A CN202211323057A CN115683757A CN 115683757 A CN115683757 A CN 115683757A CN 202211323057 A CN202211323057 A CN 202211323057A CN 115683757 A CN115683757 A CN 115683757A
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Abstract
The invention discloses an integrated device for testing the air tightness of a soil gas monitoring well, which comprises a sealing cover, wherein a walking mechanism is arranged on the outer wall of the sealing cover close to the bottom of the sealing cover, a handle is fixedly arranged at the top of the sealing cover, an air inlet pipe and an exhaust pipe penetrate through the outer wall of the sealing cover, a first valve is arranged on the air inlet pipe, and a second valve is arranged on the exhaust pipe; this device is through with the sealed cowling, negative pressure sampling case, vacuum pump etc. carry out the integrated design, make the structure compacter, need not the scene to assemble when being convenient for transport, thereby ensure the leakproofness of device, it is more convenient to use, setting through handle and running gear, when needs carry out short distance removal to the device, only need rotate the screw rod through the hand wheel, utilize the screw rod to move down with the screw-thread fit drive universal wheel of backup pad, so that universal wheel and ground contact, and jack-up the sealed cowling, can promote the sealed cowling, in order to remove through the whole device of universal wheel pair.
Description
Technical Field
The invention relates to the field of air tightness tests, in particular to an integrated device for air tightness tests of a soil gas monitoring well.
Background
The soil gas is a gas phase component in soil pores in the aeration zone of the site and is used for evaluating the pollution status of volatile organic compounds in the site. The air tightness of the soil gas monitoring well plays a vital role in collecting representative soil gas.
A tracer gas method for detecting the air tightness of a soil gas monitoring well is provided in the local standard 'survey of volatile organic compounds in a polluted site and risk assessment technical guide' (DB 11/T1278-2015) in Beijing City. However, most of the parts in the air tightness detection system mentioned in the guidance are independent devices, and need to be temporarily assembled when being used on site, so that the operation is complicated, the air tightness of the system is difficult to guarantee, and the system is inconvenient to transport and move and needs to be improved.
Disclosure of Invention
The invention aims to provide an integrated device for testing the air tightness of a soil gas monitoring well, which aims to solve the problems in the background art.
In order to achieve the purpose, the invention provides the following technical scheme:
the utility model provides a soil gas monitoring well gas tightness test integrate device, includes the sealed cowling, the outer wall of sealed cowling is close to bottom department and installs running gear, the top fixed mounting of sealed cowling has the handle, the outer wall of sealed cowling runs through and is provided with intake pipe and blast pipe, install first valve in the intake pipe, install the second valve on the blast pipe, the outer wall fixedly connected with vacuum pump and the negative pressure sampling case of sealed cowling, the air inlet of vacuum pump is through the gas outlet intercommunication of first connecting pipe with negative pressure sampling case, and installs the third valve on the first connecting pipe, the air inlet of negative pressure sampling case has the hose through second connecting pipe intercommunication, the second connecting pipe runs through the outer wall of sealed cowling, the hose is located the sealed cowling, and the air inlet of hose installs the joint.
As a further scheme of the invention: the outer wall of negative pressure sampling case is provided with the sample connection, can dismantle on the sample connection and be connected with sealed lid.
As a further scheme of the invention: and the second connecting pipe is provided with a flowmeter and a pressure gauge.
As a further scheme of the invention: the outer wall of the sealing cover is provided with a control host, the outer wall of the control host is provided with a display screen, a button and three knobs, and the three knobs are in one-to-one correspondence with the first valve, the second valve and the third valve.
As a still further scheme of the invention: the running gear includes a plurality of backup pads of fixing on the sealed cowling outer wall, the top of backup pad is connected with the screw rod through the screw hole cooperation, the top fixed mounting of screw rod has the hand wheel, the bottom of screw rod is rotated and is connected with the universal wheel.
As a still further scheme of the invention: the use method of the integrated device comprises the following steps:
the method comprises the following steps: connecting a joint at the end part of a hose with an air duct of a soil gas monitoring well, covering a sealing cover on the outer side of the soil gas monitoring well, and then communicating a trace gas storage tank with an air inlet pipe;
step two: opening the first valve and the second valve to discharge the original gas in the sealing cover through the exhaust pipe while introducing the inert tracer gas into the sealing cover;
step three: collecting gas samples in the closed hood at the outlet end of the exhaust pipe at intervals, and analyzing the concentration of the inert tracer gas by using an inert gas concentration detector;
step four: after the concentration of the tracer gas in the closed cover is not lower than 50%, closing the first valve and the second valve, starting the vacuum pump, and adjusting the vacuum degree of the negative pressure sampling box by operating the third valve so as to sample the soil gas;
step five: after a soil gas sample with required amount is collected, sampling is carried out through a sampling port, and the concentration of inert tracer gas in the soil gas sample is detected by using an inert gas concentration detector;
step six: if the concentration of the inert tracer gas in the soil gas sample is lower than 10%, the air tightness of the soil gas monitoring well is considered to meet the technical requirement, if the concentration is higher than 10%, the soil gas monitoring well is abandoned, and the soil gas monitoring well meeting the technical requirement of air tightness is newly built outside the range of the diameter of the well being 1.5 m.
Compared with the prior art, the invention has the beneficial effects that:
1. this device is through with the sealed cowling, negative pressure sampling case, vacuum pump etc. carry out the integrated design, make the structure compacter, need not the scene to assemble when being convenient for transport, thereby ensure the leakproofness of device, it is more convenient to use, setting through handle and running gear, when needs carry out short distance removal to the device, only need rotate the screw rod through the hand wheel, utilize the screw rod to move down with the screw-thread fit drive universal wheel of backup pad, so that universal wheel and ground contact, and jack-up the sealed cowling, can promote the sealed cowling, in order to remove through the whole device of universal wheel pair.
Drawings
FIG. 1 is a schematic structural diagram of an integrated device for testing air tightness of a soil gas monitoring well.
FIG. 2 is a schematic cross-sectional view of a sealing cover in an integrated device for testing air tightness of a soil gas monitoring well.
FIG. 3 is a schematic structural diagram of a traveling mechanism in the integrated device for testing the air tightness of the soil gas monitoring well.
The device comprises a sealing cover 1, a handle 2, an air inlet pipe 3, a first valve 4, an exhaust pipe 5, a second valve 6, a negative pressure sampling box 7, a flow meter 8, a pressure gauge 9, a sampling port 10, a vacuum pump 11, a hose 12, a connector 13, a control host 14, a display screen 15, a supporting plate 16, a screw 17, a hand wheel 18, a universal wheel 19, a knob 20, a key 21 and a third valve 22.
Detailed Description
The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious 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 obtained by a person skilled in the art without making any creative effort based on the embodiments in the present invention, belong to the protection scope of the present invention.
Referring to fig. 1 to 3, in the embodiment of the invention, an integrated device for testing the air tightness of a soil gas monitoring well comprises a sealing cover 1, wherein the sealing cover 1 is a square box body with an open bottom, the length, the width and the height of the sealing cover 1 are 40-60cm, a travelling mechanism is installed on the outer wall of the sealing cover 1 close to the bottom, a handle 2 is fixedly installed at the top of the sealing cover 1, an air inlet pipe 3 and an air outlet pipe 5 are arranged on the outer wall of the sealing cover 1 in a penetrating manner, a first valve 4 is installed on the air inlet pipe 3, a second valve 6 is installed on the air outlet pipe 5, a vacuum pump 11 and a negative pressure sampling box 7 are fixedly connected to the outer wall of the sealing cover 1, the specific model of the vacuum pump 11 is XH-CYQ 5-8L, the air inlet of the vacuum pump 11 is communicated with the air outlet of the negative pressure sampling box 7 through a first connecting pipe, the volume of the negative pressure sampling box 7 is 1-4L, a third valve 22 is installed on the first connecting pipe, the air inlet of the negative pressure sampling box 7 is communicated with a hose 12 through the second connecting pipe, the second connecting pipe penetrates through the outer wall of the sealing cover 1, and the hose 12 is located in the sealing cover 1, and a hose joint 13 is installed on the sealing cover 1.
The outer wall of negative pressure sampling case 7 is provided with sample connection 10, can dismantle on the sample connection 10 and be connected with sealed lid.
The second connecting pipe is provided with a flowmeter 8 and a pressure gauge 9, the measuring range of the flowmeter 8 is 0-10L/min, the precision is 0.1L/min, the specific model is DFG-6T, one end of the flowmeter 8 is communicated with the pressure gauge 9, the other end of the flowmeter 8 is communicated with a hose 12, the measuring range of the pressure gauge 9 is 0-50kPa/100kPa, the precision is 0.1kPa, and the specific model is MIK-Y290.
The utility model discloses a PLC controller, including sealed cowling 1, display screen 15, button 21, three knob 20, display screen 14, button 21 and three knob 22 are installed to the outer wall of sealed cowling 1, it is three to be provided with on the outer wall of control host 14 the knob 20 and first valve 4, second valve 6, third valve 22 one-to-one, be provided with the PLC controller in the control host 14, and display screen 14 and button 21 are the subassembly that this PLC controller was taken certainly, and first valve 4, second valve 6, third valve 22 are the motorised valve, and three knob 20 is the knob coding switch, and is used for controlling the degree of opening and shutting of corresponding first valve 4, second valve 6, third valve 22 respectively.
Running gear includes a plurality of backup pads 16 of fixing on the 1 outer wall of sealed cowling, the top of backup pad 16 is connected with screw rod 17 through the screw hole cooperation, the top fixed mounting of screw rod 17 has hand wheel 18, the bottom of screw rod 17 is rotated and is connected with universal wheel 19, rotates behind the screw rod 17 through hand wheel 18, can utilize screw rod 17 and backup pad 16's screw-thread fit drive universal wheel 19 to remove downwards to make universal wheel 19 and ground contact, and jack-up sealed cowling 1, can promote sealed cowling 1, in order to remove through universal wheel 19.
The use method of the integrated device comprises the following steps:
the method comprises the following steps: connecting a connector 13 at the end part of a hose 12 with an air duct of a soil gas monitoring well, covering a sealing cover 1 on the outer side of the soil gas monitoring well, and then communicating a trace gas storage tank with an air inlet pipe 3;
step two: opening a first valve 4 and a second valve 6 to discharge the original gas in the sealing cover 1 through an exhaust pipe 5 while introducing the inert tracer gas into the sealing cover 1;
step three: collecting gas samples in the closed cover 1 at the outlet end of the exhaust pipe 5 at intervals, and analyzing the concentration of the inert tracer gas by using an inert gas concentration detector;
step four: after the concentration of the tracer gas in the closed cover 1 is not lower than 50%, closing the first valve 4 and the second valve 6, starting the vacuum pump 11, and regulating the vacuum degree of the negative pressure sampling box 7 by operating the third valve 22 so as to sample the soil gas;
step five: after a soil gas sample with required amount is collected, sampling is carried out through a sampling port 10, and the concentration of inert tracer gas in the soil gas sample is detected by using an inert gas concentration detector;
step six: if the concentration of the inert tracer gas in the soil gas sample is lower than 10%, the air tightness of the soil gas monitoring well is considered to meet the technical requirement, if the concentration is higher than 10%, the soil gas monitoring well is abandoned, and the soil gas monitoring well meeting the technical requirement of air tightness is newly built outside the range of the diameter of the well being 1.5 m.
In the process of constructing the soil gas monitoring well in the actual field, the device is used for detecting the air tightness of the monitoring well, and the result is shown in table 1; and compared with the system airtightness of the field assembly device described in DB11/T1278-2015, the specific method is to start the vacuum pump 11 to pump until the negative pressure gauge displays the reading of 35KPa, then close the vacuum pump 11, continuously observe the reading of the negative pressure gauge for 5min and record the reading every 1min, and the result is shown in Table 2:
TABLE 1 air tightness test result of soil gas monitoring well by using the device of the present invention
TABLE 2 systematic gas tightness comparison of the inventive device with the field-assembled device
The result shows that the result meets the requirement for detecting the air tightness of the soil gas monitoring well by using the device; and compared with the air tightness test result of the field assembly device system, the system air tightness of the device is superior to that of the assembly device. Consequently, this device can carry out effectual test to soil gas monitoring well gas tightness, and because this device is through with sealed cowling 1, negative pressure sampling case 7, vacuum pump 11 etc. carry out the integrated design, make the structure compacter, need not the scene when being convenient for transport and assemble, it is more convenient to use, setting through handle 2 and running gear, when needs carry out short distance removal to the device, only need rotate screw rod 17 through hand wheel 18, utilize screw rod 17 and the screw-thread fit drive universal wheel 19 of backup pad 16 to remove downwards, so that universal wheel 19 and ground contact, and jack-up sealed cowling 1, can promote sealed cowling 1, in order to remove whole device through universal wheel 19.
Although the present invention has been described in detail with reference to the foregoing embodiments, it will be apparent to those skilled in the art that various changes in the embodiments and/or modifications of the invention can be made, and equivalents and modifications of some features of the invention can be made without departing from the spirit and scope of the invention.
Claims (6)
1. The utility model provides a soil gas monitoring well gas tightness test's device that integrates which characterized in that: including sealed cowling (1), the outer wall of sealed cowling (1) is close to bottom department and installs running gear, the top fixed mounting of sealed cowling (1) has handle (2), the outer wall of sealed cowling (1) runs through and is provided with intake pipe (3) and blast pipe (5), install first valve (4) on intake pipe (3), install second valve (6) on blast pipe (5), the outer wall fixedly connected with vacuum pump (11) and negative pressure sampling box (7) of sealed cowling (1), the air inlet of vacuum pump (11) is through the gas outlet intercommunication of first connecting pipe and negative pressure sampling box (7), and installs third valve (22) on the first connecting pipe, the air inlet of negative pressure sampling box (7) has hose (12) through second connecting pipe intercommunication, the second connecting pipe runs through the outer wall of sealed cowling (1), hose (12) are located sealed cowling (1), and the air inlet of hose (12) installs joint (13).
2. The integrated device for testing the air tightness of the soil gas monitoring well according to claim 1, wherein: the outer wall of negative pressure sampling case (7) is provided with sample connection (10), can dismantle on sample connection (10) and be connected with sealed lid.
3. The integrated device for testing the air tightness of the soil gas monitoring well according to claim 1, wherein: and a flowmeter (8) and a pressure gauge (9) are installed on the second connecting pipe.
4. The integrated device for testing the air tightness of the soil gas monitoring well according to claim 1, wherein: the outer wall of the sealing cover (1) is provided with a control host (14), the outer wall of the control host (14) is provided with a display screen (15), a key (21) and three knobs (20), and the three knobs (20) are in one-to-one correspondence with the first valves (4), the second valves (6) and the third valves (22).
5. The integrated device for testing the airtightness of the soil gas monitoring well according to claim 1, wherein: running gear includes a plurality of backup pads (16) of fixing on sealed cowling (1) outer wall, the top of backup pad (16) is connected with screw rod (17) through the screw hole cooperation, the top fixed mounting of screw rod (17) has hand wheel (18), the bottom of screw rod (17) is rotated and is connected with universal wheel (19).
6. The integrated device for testing the air tightness of the soil gas monitoring well according to any one of claims 1 to 6, wherein: the use method of the integrated device comprises the following steps:
the method comprises the following steps: connecting a connector (13) at the end part of a hose (12) with an air duct of a soil gas monitoring well, covering a sealing cover (1) on the outer side of the soil gas monitoring well, and then communicating a tracer gas storage tank with an air inlet pipe (3);
step two: opening the first valve (4) and the second valve (6) to discharge the original gas in the sealing cover (1) gradually through the exhaust pipe (5) while introducing the inert tracer gas into the sealing cover (1);
step three: collecting gas samples in the closed cover (1) at the outlet end of the exhaust pipe (5) at intervals, and analyzing the concentration of the inert tracer gas by using an inert gas concentration detector;
step four: after the concentration of the tracer gas in the closed cover (1) is not lower than 50%, closing the first valve (4) and the second valve (6), starting the vacuum pump (11), and operating the third valve (22) to adjust the vacuum degree of a negative pressure sampling box (7) and the like so as to sample soil gas;
step five: after the soil gas sample with required amount is collected, sampling is carried out through a sampling port (10), and the concentration of inert tracer gas in the soil gas sample is detected by using an inert gas concentration detector;
step six: if the concentration of the inert tracer gas in the soil gas sample is lower than 10%, the air tightness of the soil gas monitoring well is considered to meet the technical requirement, if the concentration is higher than 10%, the soil gas monitoring well is used for exhausting gas, and the soil gas monitoring well meeting the technical requirement of air tightness is newly built outside the range of the diameter of the well being 1.5 m.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
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| CN202211323057.6A CN115683757A (en) | 2022-10-27 | 2022-10-27 | Soil gas monitoring well gas tightness test integrate device |
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| CN202211323057.6A CN115683757A (en) | 2022-10-27 | 2022-10-27 | Soil gas monitoring well gas tightness test integrate device |
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| CN115683757A true CN115683757A (en) | 2023-02-03 |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN117517623A (en) * | 2024-01-05 | 2024-02-06 | 上海久澄环境工程有限公司 | Intelligent control system of soil gas probe and soil gas automatic sampling method |
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- 2022-10-27 CN CN202211323057.6A patent/CN115683757A/en active Pending
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN117517623A (en) * | 2024-01-05 | 2024-02-06 | 上海久澄环境工程有限公司 | Intelligent control system of soil gas probe and soil gas automatic sampling method |
| CN117517623B (en) * | 2024-01-05 | 2024-03-15 | 上海久澄环境工程有限公司 | Intelligent control system of soil gas probe and soil gas automatic sampling method |
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