VOCs quality control sample simulation sampling environment device
By designing a VOCs quality control sample simulation sampling environment device that includes filters and dryers, the problems of shortened lifespan and decreased accuracy of the monitoring instrument under the influence of dust and humidity were solved, and high-precision VOC detection was achieved.
Patent Information
- Application Number
- CN202520365952.7
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2025-03-04
- Publication Date
- 2026-02-03
- Estimated Expiration
- 2035-03-04
AI Technical Summary
Existing VOC monitors have a shortened lifespan and reduced detection accuracy in dusty and humid environments. When calibrating quality control gases, they do not pass through the same sampling channel as the ambient gas, resulting in large errors in the detection results.
A VOCs quality control sample simulation sampling environment device was designed, which includes a filter and a dryer. Dust on the filter cloth is removed by backflushing, and dual dryers are set up for online replacement. The quality control gas is calibrated by passing through the same path as the gas to be tested, thus eliminating the influence of the pretreatment path.
This extends the service life of the VOC monitor, improves detection accuracy, and ensures the accuracy of the test results.
Smart Images
Figure CN223870377U_ABST
Abstract
Description
TECHNICAL FIELD
[0001] The utility model relates to gas detection technical field, concretely relates to VOCs quality control sample simulation sampling environment device. BACKGROUND
[0002] VOC is the English abbreviation of volatile organic compounds. The ordinary meaning of VOC is volatile organic compound, but the environmental protection meaning is the definition of a kind of volatile organic compound, i.e. the class of volatile organic compound that can produce harm. VOC, volatile organic compound, has great influence on human health. When the VOC in the room reaches a certain concentration, people will feel headache, nausea, vomiting, fatigue, etc. in a short time, and serious ones will have convulsions, coma, and harm to the liver, kidney, brain and nervous system, causing memory loss and other serious consequences.
[0003] At present, when environmental monitoring is carried out, VOC needs to be monitored by using VOC monitor, and the core part of VOC monitor is PID (photoionization detector), but when the solid dust in the monitored environment is more and the relative humidity is larger, it will not only affect the service life of VOC monitor, but also affect the accuracy of monitoring results. In order to filter the air in the monitored environment, most of the VOC monitors are currently equipped with simple filter screen and dryer, but the filtering function and drying function will be lost after a long time of use. The monitoring function of VOC monitor will be weakened or even lost due to the accumulation of a large amount of dust and water. In addition, the existing quality inspection gas (standard gas) directly enters the detection module when calibrating VOC monitor, without passing through the same sampling channel of the environment gas into the detection module, so the influence of the sampling channel is not excluded when calibrating, which may cause certain error to the detection result. CONTENT OF THE UTILITY MODEL
[0004] 1. The technical problem to be solved is:
[0005] In view of the above technical problems, the utility model provides VOCs quality control sample simulation sampling environment device.
[0006] 2. Technical scheme:
[0007] The utility model provides a VOCs quality control sample simulation sampling environment device, including the box, be equipped with filter and dryer in the box, the air inlet of filter connects the air outlet of first electromagnetic three -way valve, one air inlet of first electromagnetic three -way valve connects the air outlet of first electromagnetic stop valve, the air inlet of first electromagnetic stop valve connects the gas inlet of box on detection, another air inlet of first electromagnetic three -way valve connects flow controller, flow controller connects quality control sample gas bottle, the air outlet of filter connects the air inlet of dryer, the air outlet of dryer connects sampling pump, sampling pump connects the air inlet of second electromagnetic three -way valve, two air outlets of second electromagnetic three -way valve are connected with detection gas outlet and second electromagnetic stop valve respectively, and second electromagnetic stop valve connects emptying pipe.
[0008] Further, the dryer is provided with two, two dryers and filter are connected through third electromagnetic three -way valve, and two dryers are connected with sampling pump through fourth electromagnetic three -way valve.
[0009] Further, the filter includes a shell, the inside of the shell is provided with a partition plate, the top of the partition plate is provided with a plurality of filter cartridges, filter cloth is sleeved on the filter cartridges, the air inlet and the air outlet of the filter are arranged below and above the partition plate respectively, the top of each filter cartridge is provided with a backflush branch pipe, the backflush branch pipe is connected with a backflush main pipe, the backflush main pipe is connected with a high-pressure nitrogen cylinder, the backflush main pipe is provided with a backflush multi-way valve connected with a plurality of backflush branch pipes, and the bottom of the shell is provided with an ash discharge valve.
[0010] Further, the dryer is provided with two hole plates, and silica gel drying agent is filled between the hole plates.
[0011] Further, a negative pressure gauge is further arranged between the sampling pump and the fourth electromagnetic three -way valve.
[0012] Further, the gas inlet and the gas outlet are arranged on the two sides of the box respectively, and a flange connecting disc is arranged on the gas outlet for connecting a detection module.
[0013] Further, the upper segment of the shell of the filter is cylindrical, the lower segment is conical, a plurality of filter cartridges are uniformly distributed in a ring shape on the partition plate, the bottom of the filter cartridge is open and communicates with the space below the partition plate, the top of the filter cartridge is sealed, the backflush branch pipe extends into the inside of the filter cartridge, and the filter cloth is sleeved on the annular surface of the filter cartridge.
[0014] 3. Beneficial effects:
[0015] The utility model provides a kind of VOCs quality control sample simulation sampling environment device, be provided with filter and drier, filter can be removed dust on filter cloth after filtration by nitrogen back flushing, also can select to carry out back flushing to some filter core in it using back flushing multi-way valve, to ensure that it does not affect other filter core work, realize cleaning filter core in working state, drier is provided with two groups, can be used by selecting one of third electromagnetic three-way valve, it is convenient to replace in working state.In addition, the quality control gas (standard gas) of the utility model is entered into detection module by the same path of gas to be detected, when using quality control gas to calibrate detection module, the influence that each component on path can cause is excluded, to ensure the detection precision of detection module, detection result is more accurate. BRIEF DESCRIPTION OF DRAWINGS
[0016] Figure 1 It is whole structure schematic diagram of the utility model VOCs quality control sample simulation sampling environment device;
[0017] Figure 2 It is the structure schematic diagram of the utility model filter. PREFERRED EMBODIMENT
[0018] The utility model is specifically explained in connection with the drawings.
[0019] As shown in the accompanying Figure 1 To the accompanying Figure 2 As shown, Specific embodiment:
[0021] VOCs quality control sample simulation sampling environment device, including box 1, box 1 is equipped with filter 2 and drier 3, the gas inlet of filter 2 is connected the gas outlet of first electromagnetic three-way valve 4, one gas inlet of first electromagnetic three-way valve 4 is connected the gas outlet of first electromagnetic stop valve 5, the gas inlet of first electromagnetic stop valve 5 is connected the gas inlet of box 1, the other gas inlet of first electromagnetic three-way valve 4 is connected flow controller 6, flow controller 6 is connected quality control sample gas bottle 7, the gas outlet of filter 2 is connected the gas inlet of drier 3, the gas outlet of drier 3 is connected sampling pump 8, sampling pump 8 is connected the gas inlet of second electromagnetic three-way valve 9, two gas outlets of second electromagnetic three-way valve 9 are connected gas outlet to be detected and second electromagnetic stop valve 10 respectively, second electromagnetic stop valve 10 is connected emptying pipe.
[0022] The VOCs quality control sample simulation sampling environment device of the utility model needs to adopt sample gas in the quality control sample gas bottle 7 to calibrate the detection module first when working, the existing calibration mode is to pump the sample gas from the quality control sample gas bottle 7 into the detection module directly, without passing through the pretreatment path of the gas to be detected, the calibration mode does not exclude the influence of the pretreatment path on the gas composition, thereby causing the detection accuracy to decrease, therefore, the utility model places the quality control sample gas bottle 7 in front of the filter 2, closes the first electromagnetic stop valve 5 and opens the second electromagnetic stop valve 10 when calibrating, the sampling pump 8 works to empty the gas remaining in the filter 2 and the dryer 3 as much as possible, then adjusts the first electromagnetic three-way valve 4 to the quality control sample gas bottle 7 direction, the sample gas enters the filter 2 and the dryer 3 and is removed from the front section of sample gas through the sampling pump 8, when the rear section of sample gas is stable, adjusts the second electromagnetic three-way valve 9 to the gas to be detected gas outlet direction, the sample gas is pumped into the detection module connected to the gas to be detected gas outlet direction to calibrate, after calibration, adjusts the first electromagnetic three-way valve 4 direction to collect the gas to be detected for the next detection, the sample gas enters the detection module through the same pretreatment path of the gas to be detected, the influence of the pretreatment path on the gas composition is excluded, and the detection accuracy is higher.
[0023] Preferably, the dryer 3 is provided with two, the two dryers 3 and the filter 2 are connected through a third electromagnetic three-way valve 11, and the two dryers 3 are connected with the sampling pump 8 through a fourth electromagnetic three-way valve 12. The dryer 3 is provided with two and the working dryer 3 is selected through the third electromagnetic three-way valve 11 and the fourth electromagnetic three-way valve 12, so that the dryer 3 can be replaced when the drying performance of the dryer 3 is obviously reduced, the replacement process does not affect the use of the device, and the online replacement can be realized in the working state.
[0024] The filter 2 comprises a shell 21, the inside of the shell 21 is provided with a partition plate 22, the top of the partition plate 22 is provided with a plurality of filter cores 23, the filter cores 23 are sleeved with filter cloths, and the air inlet and the air outlet of the filter 2 are arranged below and above the partition plate 22 respectively; the top of each filter core 22 is provided with a back flushing branch pipe, the back flushing branch pipe is connected with a back flushing main pipe, the back flushing main pipe is connected with a high-pressure nitrogen gas bottle 24, the back flushing main pipe is provided with a back flushing multi-way valve 25 connected with a plurality of back flushing branch pipes, and the bottom of the shell 21 is provided with an ash discharge valve 26. The filter 2 of the utility model is a back flushing filter, can remove the dust trapped on the filter cloth through back flushing to restore the filtering performance, and can clean a certain filter core 23 through the back flushing multi-way valve 25 without affecting the use of other filter cores 23, so that the cleaning in the working state is ensured.
[0025] The dryer 3 is provided with two orifice plates 31, and the orifice plates 31 are filled with silica gel desiccant 32.
[0026] A negative pressure gauge 13 is further arranged between the sampling pump 8 and the fourth electromagnetic three-way valve 12, for monitoring the emptying state of residual gas in the pre-filter 2 and the dryer 3.
[0027] The gas inlet and the gas outlet are arranged on two sides of the box body 1, and the gas outlet is provided with a flange connection plate for connecting the detection module.
[0028] The upper section of the shell 21 of the filter 2 is cylindrical, and the lower section is conical; a plurality of filter cores 23 are uniformly distributed on the partition plate 22 in a ring shape; the bottom of the filter core 23 is open and communicates with the space below the partition plate 22; the top of the filter core 23 is sealed; the back flushing branch pipe extends into the inside of the filter core 23; and the filter cloth is sleeved on the ring surface of the filter core 23.
[0029] Although the utility model has disclosed as above with preferable embodiments, they are not used to limit the utility model, any skilled person, in the spirit and scope of the utility model, should be able to make various changes or decorations, therefore the protection scope of the utility model should be limited by the claim protection scope of the application.
Claims
1. A VOCs quality control sample simulation sampling environment device, characterized in that, The box is internally provided with a filter and a dryer, the air inlet of the filter is connected with the air outlet of a first electromagnetic three-way valve, one of the air inlets of the first electromagnetic three-way valve is connected with the air outlet of a first electromagnetic stop valve, the air inlet of the first electromagnetic stop valve is connected with the gas inlet to be detected on the box, the other air inlet of the first electromagnetic three-way valve is connected with a flow controller, the flow controller is connected with a quality control sample gas bottle, the air outlet of the filter is connected with the air inlet of the dryer, the air outlet of the dryer is connected with a sampling pump, the air inlet of the sampling pump is connected with the air inlet of a second electromagnetic three-way valve, the two air outlets of the second electromagnetic three-way valve are respectively connected with the gas outlet to be detected and a second electromagnetic stop valve, and the second electromagnetic stop valve is connected with an emptying pipe.
2. The VOCs quality control sample simulated sampling environment apparatus of claim 1, wherein, The dryer is provided with two, the two dryers and the filter are connected through a third electromagnetic three-way valve, and the two dryers are connected with the sampling pump through a fourth electromagnetic three-way valve.
3. The VOCs quality control sample simulation sampling environment apparatus of claim 1 or 2, wherein, The filter comprises a shell, the inside of the shell is provided with a partition plate, the top of the partition plate is provided with a plurality of filter cartridges, filter cloth is sleeved on the filter cartridges, the air inlets and the air outlets of the filter are respectively arranged below and above the partition plate, the top of each filter cartridge is provided with a back flushing branch pipe, the back flushing branch pipe is connected with a back flushing main pipe, the back flushing main pipe is connected with a high-pressure nitrogen gas bottle, the back flushing main pipe is provided with a back flushing multi-way valve connected with a plurality of back flushing branch pipes, and the bottom of the shell is provided with an ash discharge valve.
4. The VOCs quality control sample simulated sampling environment apparatus of claim 3, wherein, The dryer is internally provided with two orifice plates, and the orifice plates are filled with silica gel desiccant.
5. The VOCs quality control sample simulated sampling environment apparatus of claim 2, wherein, A negative pressure gauge is further arranged between the sampling pump and the fourth electromagnetic three-way valve.
6. The VOCs quality control sample simulated sampling environment apparatus of claim 5, wherein, The gas inlet to be detected and the gas outlet to be detected are respectively arranged on the two sides of the box, the gas outlet to be detected is provided with a flange connecting disc for connecting a detection module.
7. The VOCs quality control sample simulated sampling environment apparatus of claim 6, wherein, The upper section of the shell of the filter is cylindrical, the lower section is conical, the plurality of filter cartridges are uniformly distributed in a ring shape on the partition plate, the bottom of the filter cartridge is open and communicates with the space below the partition plate, the top of the filter cartridge is sealed, the back flushing branch pipe extends into the inside of the filter cartridge, and the filter cloth is sleeved on the annular surface of the filter cartridge.