CN112394145A - Low-pressure VOC (volatile organic compound) test device - Google Patents
Low-pressure VOC (volatile organic compound) test device Download PDFInfo
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- CN112394145A CN112394145A CN202011353115.0A CN202011353115A CN112394145A CN 112394145 A CN112394145 A CN 112394145A CN 202011353115 A CN202011353115 A CN 202011353115A CN 112394145 A CN112394145 A CN 112394145A
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- pressure
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- bearing heat
- insulation box
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N33/00—Investigating or analysing materials by specific methods not covered by groups G01N1/00 - G01N31/00
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01L—CHEMICAL OR PHYSICAL LABORATORY APPARATUS FOR GENERAL USE
- B01L1/00—Enclosures; Chambers
- B01L1/02—Air-pressure chambers; Air-locks therefor
- B01L1/025—Environmental chambers
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N33/00—Investigating or analysing materials by specific methods not covered by groups G01N1/00 - G01N31/00
- G01N33/0004—Gaseous mixtures, e.g. polluted air
- G01N33/0009—General constructional details of gas analysers, e.g. portable test equipment
- G01N33/0027—General constructional details of gas analysers, e.g. portable test equipment concerning the detector
- G01N33/0036—Specially adapted to detect a particular component
- G01N33/0047—Specially adapted to detect a particular component for organic compounds
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02A—TECHNOLOGIES FOR ADAPTATION TO CLIMATE CHANGE
- Y02A50/00—TECHNOLOGIES FOR ADAPTATION TO CLIMATE CHANGE in human health protection, e.g. against extreme weather
- Y02A50/20—Air quality improvement or preservation, e.g. vehicle emission control or emission reduction by using catalytic converters
Abstract
The invention discloses a low-pressure VOC test device which comprises a pressure-bearing heat insulation box, wherein a test cabin for placing a workpiece to be tested is arranged in the pressure-bearing heat insulation box; the pressure relief pipe is arranged on the test cabin to communicate the pressure-bearing heat insulation box and the test cabin, and is provided with a pressure regulating valve; the pressure regulating device is used for regulating the air pressure of the pressure-bearing heat insulation box and comprises an air outlet pipeline communicated with the outside and the pressure-bearing heat insulation box, and a first control valve and a vacuum pump are sequentially arranged on the air outlet pipeline along the air flowing direction. The invention can simulate different air pressure values in the test chamber, thereby providing detection environments for detecting the volatilization rates of VOC pollutants under different air pressures for the material to be detected or the workpiece to be detected.
Description
Technical Field
The invention relates to the technical field of gas collection equipment, in particular to a low-pressure VOC test device.
Background
With the continuous improvement of living standard of people, the requirements of people on living environment are also greatly improved. Many existing indoor materials and products contain toxic substances such as formaldehyde, and in order to guarantee human health, the release rate and release characteristics of Volatile Organic Compounds (VOC) containing benzene, toluene, formaldehyde and the like in the indoor materials and products need to be detected, so that qualified indoor materials and products are obtained, and people have a good living environment.
However, a low-pressure VOC test device is lacking in the market, the air pressure value in the test chamber of the existing VOC test device is constant, and the adjustment of the air pressure value in the test inner chamber of the test chamber cannot be realized, so that the reliability of various volatile VOC gas materials or workpieces in different air pressure states cannot be demonstrated. Therefore, it is desirable to design a low-pressure VOC test device that can change the air pressure value of the test chamber.
Disclosure of Invention
The invention aims to provide a low-pressure VOC test device to solve the problem that the existing low-pressure VOC test device cannot change the air pressure of a test chamber.
In order to achieve the purpose, the invention adopts the following technical scheme:
a low pressure VOC test device comprising:
the test chamber is used for placing a workpiece to be tested;
the gas input device is used for inputting clean gas to the test chamber;
the pressure relief pipe is arranged on the test cabin to communicate the test cabin with the pressure-bearing heat insulation box, and is provided with a pressure regulating valve used for ensuring that the interior of the test cabin is in a micro-positive pressure state;
and the pressure regulating device is used for regulating the air pressure of the pressure-bearing heat insulation box and comprises an air outlet pipeline communicated with the outside and the pressure-bearing heat insulation box and a vacuum pump arranged on the air outlet pipeline.
Optionally, the gas input device comprises a gas source and a gas inlet pipe, and the gas inlet pipe is communicated with the gas source and the test chamber;
and the air inlet pipe is provided with a humidity adjusting device for adjusting the humidity of the air entering the test cabin.
Optionally, a flow monitoring device for observing the flow of the clean gas passing through the gas inlet pipe is arranged on the gas inlet pipe; the flow monitoring device and the humidity regulating device are sequentially arranged on the air inlet pipe according to the flowing direction of the gas, the flow monitoring device is positioned outside the pressure-bearing heat insulation box, and the humidity regulating device is positioned in the pressure-bearing heat insulation box or outside the pressure-bearing heat insulation box.
Optionally, the VOC testing apparatus further comprises a control system and a pressure sensing device for detecting the air pressure of the pressure-bearing incubator; the control system is electrically connected with the pressure sensing device, the vacuum pump and the gas input device respectively.
Optionally, a VOC filtering device is further arranged on the pressure relief pipe; the pressure regulating valve and the VOC filtering device are sequentially arranged on the pressure relief pipe according to the flowing direction of gas.
Optionally, the low-pressure VOC test apparatus further comprises a heater disposed in the pressure-bearing heat-insulation box, an evaporator disposed in the pressure-bearing heat-insulation box, and a circulating fan for driving gas in the pressure-bearing heat-insulation box to flow.
Optionally, a heating pipe is arranged on the side wall of the test chamber, and the heating pipe is located at the air inlet end of the stirring fan.
Optionally, a stirring fan and a first magnetic sealing motor for driving the stirring fan to rotate are installed in the test cabin; the first magnetic sealing motor is arranged on the outer side wall of the test cabin, and the first magnetic sealing motor is located in the pressure-bearing heat preservation box.
Optionally, a gap is arranged between the outer side wall of the test chamber and the inner side wall of the pressure-bearing heat insulation box.
Optionally, a bracket is arranged at the bottom of the pressure-bearing heat insulation box, and the test cabin is arranged on the bracket;
the support is formed by welding round pipes.
Compared with the prior art, the invention has the following beneficial effects:
the low-pressure VOC test device provided by the invention is arranged in a pressure-bearing insulation box of a pressure-bearing insulation box through a test cabin, the test cabin is communicated with the pressure-bearing insulation box through a pressure relief pipe, and the pressure relief pipe is provided with a pressure regulating valve; the pressure-bearing heat insulation box is communicated with the outside through the pressure regulating device, the vacuum pump in the pressure-bearing device pumps out the gas in the pressure-bearing heat insulation box to change the gas pressure value in the pressure-bearing heat insulation box, and then the gas in the test cabin is discharged into the pressure-bearing heat insulation box through the pressure regulating valve so that the gas pressure in the test cabin is slightly higher than that of the pressure-bearing heat insulation box, and the gas pressure in the test cabin is regulated.
Drawings
In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings used in the description of the embodiments or the prior art will be briefly described below, and it is obvious that the drawings in the following description are only some embodiments of the present invention, and for those skilled in the art, other drawings can be obtained according to these drawings without inventive exercise.
The structure, proportion, size and the like shown in the drawings are only used for matching with the content disclosed in the specification, so that the person skilled in the art can understand and read the description, and the description is not used for limiting the limit condition of the implementation of the invention, so the method has no technical essence, and any structural modification, proportion relation change or size adjustment still falls within the scope of the technical content disclosed by the invention without affecting the effect and the achievable purpose of the invention.
FIG. 1 is a schematic structural view of a low-pressure VOC testing device provided in one embodiment of the present invention;
fig. 2 is a schematic structural view of a low-pressure VOC testing apparatus according to a second embodiment of the present invention.
Illustration of the drawings: 1. a pressure-bearing heat insulation box; (ii) a 12. A pressure regulating device; 121. an air outlet pipeline; 122. a first control valve; 123. a vacuum pump; 13. a heater; 14. an evaporator; 15. a circulating fan;
2. a test chamber; 22. a pressure relief pipe; 23. a pressure regulating valve; 24. a VOC filtration device; 25. a stirring fan; 26. a first magnetically sealed motor; 27. a pressure sensing device; 28. heating a tube;
3. a gas input device; 31. an air inlet pipe; 32. a humidity control device; 33. a flow monitoring device.
Detailed Description
In order to make the objects, features and advantages of the present invention more obvious and understandable, the technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings in the embodiments of the present invention, and it is obvious that the embodiments described below are only a part of the embodiments of the present invention, and not all of the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
In the description of the present invention, it is to be understood that the terms "upper", "lower", "top", "bottom", "inner", "outer", and the like, indicate orientations or positional relationships based on those shown in the drawings, and are used only for convenience in describing the present invention and for simplicity in description, and do not indicate or imply that the referenced devices or elements must have a particular orientation, be constructed and operated in a particular orientation, and thus, are not to be construed as limiting the present invention. It should be noted that when one component is referred to as being "connected" to another component, it can be directly connected to the other component or intervening components may also be present.
The technical scheme of the invention is further explained by the specific implementation mode in combination with the attached drawings.
The invention provides a low-pressure VOC test device, which can maintain a pressure-bearing insulation can 1 and a test chamber 2 in a low-pressure state. The gas input device 3 inputs clean gas into the test chamber 2, and the test chamber is kept at micro positive pressure through the pressure regulating valve 23 and the vacuum pump 123, so that support is provided for VOC test of the material to be detected under different air pressure values. The embodiment mainly realizes the adjustment of the low air pressure values of the pressure-bearing heat insulation box 1 and the test cabin 2.
Example one
Referring to fig. 1, an embodiment of the present invention provides a low-pressure VOC testing apparatus, including a pressure-bearing thermal insulation box 1 and a testing chamber 2.
The test chamber 2 is placed in the pressure-bearing heat-insulating box 1. The pressure-bearing heat insulation box 1 is provided with an openable cabin door so as to be convenient for placing the test cabin 2; the test chamber 2 is provided with an openable and closable chamber door to facilitate the insertion of a workpiece.
The test cabin 2 is provided with a pressure relief pipe 22 communicated with the pressure-bearing heat insulation box 1, the pressure relief pipe 22 is provided with a pressure regulating valve 23, and the pressure regulating valve 23 is used for controlling the air pressure value of the test cabin 2 so that the air pressure of the test cabin 2 is slightly positive relative to the air pressure of the pressure-bearing heat insulation box 1.
And the pressure regulating device 12 is used for regulating the air pressure value of the pressure-bearing heat insulation box 1. The pressure regulating device 12 includes a gas outlet pipeline 121, and a first control valve 122 and a vacuum pump 123 are sequentially disposed on the gas outlet pipeline 121 along a gas flowing direction. The first control valve 122 is used to close off the outlet line 121 when venting is not required.
Specifically, the pressure regulating device 12 regulates the air pressure value of the pressure-bearing heat-insulating box 1 through the vacuum pump 123, so as to change the air pressure of the pressure-bearing heat-insulating box 1 and the air pressure of the test chamber 2.
Optionally, the low-pressure VOC test device comprises a gas input device 3 for inputting clean gas to the test chamber 2; the gas input device 3 comprises a gas source and a gas inlet pipe 31, and the gas inlet pipe 31 is communicated with the gas source and the test chamber 2; the air inlet pipe 31 is provided with a humidity control device 32 for controlling the humidity of the air entering the test chamber 2. Specifically, the gas inlet device 3 is used to supply clean gas to the test chamber 2, and at this time, the flow rate of the supplied gas and the flow rate of the gas passing through the pressure regulating valve 23 are appropriately adjusted, so that the test chamber 2 can be maintained in a stable test environment. It should be noted that the test chamber 2 maintains a slight positive pressure in the test chamber 2 through the gas input device 3 or the pressure regulating valve 23, and when the pressure value of the test chamber 2 needs to be increased, the flow rate of the clean gas input by the gas input device 3 can be increased; when the air pressure value of the test chamber 2 needs to be reduced, the flow of the clean air input into the test chamber 2 by the air input device 3 can be reduced, or the flow of the air passing through the pressure regulating valve 23 can be properly increased. It should be noted that when the air pressure of the test chamber 2 is adjusted, the air pressure value of the pressure-bearing heat-insulation box 1 needs to be adjusted first, so as to avoid that the air flows back to the test chamber 2 due to the overhigh air pressure value of the pressure-bearing heat-insulation box 1. Specifically, under the interaction of the vacuum pump 123, the pressure regulating valve 23 and the gas input device 3, the pressure value of the pressure-bearing heat insulation box 1 is slightly higher than that of the test chamber 2.
Optionally, the intake pipe 31 is provided with a flow rate monitoring device 33 for observing the flow rate of the clean gas passing through the intake pipe 31; the flow rate monitoring device 33 and the humidity control device 32 are provided in the intake pipe 31 in this order in the flow direction of the gas. Specifically, the flow monitoring device 33 is used to instruct the worker to perform the pressure increasing or decreasing operation, thereby improving the accuracy of adjusting the air pressure value of the test chamber 2. The flow rate monitoring device 33 is provided in front of the humidity control device 32, and can prevent the gas after humidity control from affecting the flow rate of the clean gas actually supplied. The humidity control apparatus 32 may be used to increase the water content of the gas passing therethrough, or may be used to dry the gas passing therethrough.
Optionally, the low-pressure VOC testing device further comprises a control system and a pressure sensing device 27 for detecting the pressure value of the pressure-bearing heat-insulation box 1; the pressure sensing device 27 is arranged in the pressure-bearing heat insulation box 1; the control system is electrically connected with the pressure sensing device 27, the vacuum pump 123 and the gas input device 3 respectively. Specifically, the control system receives the air pressure value detected by the pressure sensing device 27, and controls the vacuum pump 123 to open or close according to the detected air pressure value and the set air pressure value of the test chamber. When the detected air pressure value is larger than the set air pressure value of the test chamber, the vacuum pump 123 is started and pumps air to the outside to reduce the air pressure value of the pressure-bearing heat-insulation box 1; when the detected air pressure value is smaller than the set air pressure value of the test chamber, the vacuum pump 123 is turned off. In addition, the control system controls the gas input device 3 to maintain a stable flow rate to input the clean gas to the test chamber 2.
Optionally, a VOC filtering device 24 is further disposed on the pressure relief pipe 22; the pressure regulating valve 23 and the VOC filtering device 24 are provided in the pressure release pipe 22 in this order in the direction of gas flow. The VOC filtering device 24 is used for absorbing VOC gas and preventing VOC gas in the pressure-bearing heat insulation box 1 from entering the test chamber 2, and the detection effect of the external VOC gas in the test chamber 2 is influenced.
Optionally, the low-pressure VOC testing apparatus further includes a heater 13 disposed in the pressure-bearing heat-insulating box 1, an evaporator 14 disposed in the pressure-bearing heat-insulating box 1, and a circulating fan 15 for driving gas in the pressure-bearing heat-insulating box 1 to flow. Specifically, the heater is used for adjusting the temperature of the gas in the pressure-bearing heat insulation box 1, the evaporator 14 is used for adjusting the humidity of the gas in the pressure-bearing heat insulation box 1, and the circulating fan 15 is used for driving the gas in the pressure-bearing heat insulation box 1 to circulate so as to improve the uniformity of the temperature of the gas.
Optionally, a heating pipe 28 is disposed on the side wall of the test chamber 2, and the heating pipe 28 is located at the air inlet end of the stirring fan 25. The heating pipe is used for compensating the temperature of the gas in the test chamber 2, the temperature uniformity of the gas heated by the heating pipe can be further improved after the gas is stirred by the stirring fan 25, the VOC detection result is prevented from being influenced by the condition of uneven temperature in the test chamber 2, and the VOC detection precision is improved. In addition, the stirrer fan 25 is driven by a magnetic sealing motor, which is favorable for improving sealing capability and preventing air leakage.
Optionally, a stirring fan 25 and a first magnetic sealing motor 26 for driving the stirring fan 25 to rotate are installed in the test chamber 2; the first magnetic sealing motor 26 is installed on the outer side wall of the test chamber 2, and the first magnetic sealing motor 26 is located in the pressure-bearing heat insulation box 1. In the same way, the first magnetic sealing motor 26 can effectively improve the sealing capability and prevent the gas of the test chamber 2 from leaking into the pressure-bearing heat insulation box 1 along the motor shaft.
An interval is arranged between the outer side wall of the test chamber 2 and the inner side wall of the pressure-bearing heat insulation box 1, the circulating fan 15 is arranged in the interval, and the driving gas circularly flows around the test chamber 2.
Optionally, a support is arranged at the bottom of the pressure-bearing heat insulation box 1, the test chamber 2 is arranged on the support, and the support is formed by welding circular tubes. The support formed by welding the circular tubes is beneficial to reducing the resistance of gas flow rotation and saving energy.
In this embodiment, the humidity control device 32 is provided in the pressure-bearing heat-insulating box 1, and the integration degree of the low-pressure VOC test device is high, which is advantageous for reducing the volume of the low-pressure VOC test device.
Example two
Referring to fig. 2, the first embodiment of the present invention is mainly improved in that a separate cavity is disposed on an outer sidewall of the pressure-bearing thermal insulation box 1 to store the humidity control device 32, so as to prevent the humidity control device 32 from affecting the air pressure value inside the pressure-bearing thermal insulation box 1 due to heat generation and other factors in the actual process. The air pressure stability of the test chamber 2 is improved.
The above-mentioned embodiments are only used for illustrating the technical solutions of the present invention, and not for limiting the same; although the present invention has been described in detail with reference to the foregoing embodiments, it will be understood by those of ordinary skill in the art that: the technical solutions described in the foregoing embodiments may still be modified, or some technical features may be equivalently replaced; and such modifications or substitutions do not depart from the spirit and scope of the corresponding technical solutions of the embodiments of the present invention.
Claims (10)
1. A low pressure VOC test device, comprising:
the device comprises a pressure-bearing heat insulation box (1), wherein a test cabin (2) for placing a workpiece to be tested is arranged in the pressure-bearing heat insulation box (1);
a gas input device (3) for inputting clean gas to the test chamber (2);
the pressure relief pipe (22) is arranged on the test cabin (2) and used for communicating the test cabin (2) with the pressure-bearing heat insulation box (1), a pressure regulating valve (23) is arranged on the pressure relief pipe (22), and the pressure regulating valve (23) is used for ensuring that the interior of the test cabin (2) is in a micro-positive pressure state;
and the pressure regulating device (12) is used for regulating the air pressure of the pressure-bearing heat insulation box (1), and the pressure regulating device (12) comprises an air outlet pipeline (121) communicated with the outside and the pressure-bearing heat insulation box (1) and a vacuum pump (123) arranged on the air outlet pipeline (121).
2. The low-pressure VOC test device according to claim 1, wherein the gas input device (3) comprises a gas source and a gas inlet pipe (31), the gas inlet pipe (31) communicating the gas source with the test chamber (2);
and a humidity adjusting device (32) used for adjusting the humidity of the gas entering the test cabin (2) is arranged on the gas inlet pipe (31).
3. A low-pressure VOC test device according to claim 2, characterized in that the inlet pipe (31) is provided with a flow monitoring device (33) for observing the flow of clean gas through the inlet pipe (31); the flow monitoring device (33) and the humidity regulating device (32) are sequentially arranged on the air inlet pipe (31) according to the flowing direction of the air, the flow monitoring device (33) is positioned on the outer side of the pressure-bearing heat-insulation box (1), and the humidity regulating device (32) is positioned in the pressure-bearing heat-insulation box (1) or on the outer side of the pressure-bearing heat-insulation box (1).
4. The low-pressure VOC testing device according to claim 2, characterized by further comprising a control system and a pressure sensing device (27) for detecting the air pressure of said pressure-bearing incubator (1); the control system is electrically connected with the pressure sensing device (27), the vacuum pump (123) and the gas input device (3) respectively.
5. A low-pressure VOC test device according to claim 1 wherein the pressure relief pipe (22) is further provided with a VOC filter device (24); the pressure regulating valve (23) and the VOC filtering device (24) are sequentially arranged on the pressure relief pipe (22) according to the flowing direction of gas.
6. The low-pressure VOC test device according to claim 1, further comprising a heater (13) disposed in said pressure-bearing heat-insulating box (1), an evaporator (14) disposed in said pressure-bearing heat-insulating box (1), and a circulating fan (15) for driving the gas flow in said pressure-bearing heat-insulating box (1) to rotate.
7. The low-pressure VOC test device according to claim 6, characterized in that a heating pipe (28) is arranged on the side wall of said test chamber (2), and said heating pipe (28) is located at the air inlet end of said stirring fan (25).
8. The low-pressure VOC test device according to claim 1, characterized in that a stirring fan (25) and a first magnetic sealing motor (26) for driving the stirring fan (25) to rotate are installed in the test chamber (2); the first magnetic sealing motor (26) is installed on the outer side wall of the test cabin (2), and the first magnetic sealing motor (26) is located in the pressure-bearing heat insulation box (1).
9. The low-pressure VOC test device according to claim 1, characterized in that a space is provided between the outer side wall of said test chamber (2) and the inner side wall of said pressure-bearing heat-insulation box (1).
10. The low-pressure VOC test device according to claim 9, characterized in that a support is arranged at the bottom of said pressure-bearing and heat-insulating box (1), and said test chamber (2) is arranged on said support;
the support is formed by welding round pipes.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202011353115.0A CN112394145A (en) | 2020-11-26 | 2020-11-26 | Low-pressure VOC (volatile organic compound) test device |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202011353115.0A CN112394145A (en) | 2020-11-26 | 2020-11-26 | Low-pressure VOC (volatile organic compound) test device |
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| Publication Number | Publication Date |
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| CN112394145A true CN112394145A (en) | 2021-02-23 |
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| Application Number | Title | Priority Date | Filing Date |
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| CN202011353115.0A Pending CN112394145A (en) | 2020-11-26 | 2020-11-26 | Low-pressure VOC (volatile organic compound) test device |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113413931A (en) * | 2021-06-10 | 2021-09-21 | 湖北云沛科技有限公司 | Radiation low-pressure environment simulation cabin |
-
2020
- 2020-11-26 CN CN202011353115.0A patent/CN112394145A/en active Pending
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113413931A (en) * | 2021-06-10 | 2021-09-21 | 湖北云沛科技有限公司 | Radiation low-pressure environment simulation cabin |
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