Sample pretreatment optimizing device based on MVOC detection

Abstract

The utility model belongs to the technical field of environmental monitoring, and discloses an optimized sample pretreatment device based on MVOC detection, which comprises a sample cabin, and the sample cabin consists of a sample shell and a sealing cover; an air pump is mounted on the sample shell, a gas pipeline is mounted on the air pump, the gas pipeline is connected with the sample shell to form a gas circulation loop, an adsorption pipe is detachably mounted on the gas pipeline, a flow meter is mounted on the adsorption pipe, and a ceramic annular heater is mounted on the outer surface of the adsorption pipe in a sleeving manner; the ceramic annular heater is electrically connected with an external power switch through an electric wire, a fixing frame is installed on the sample shell, the ceramic annular heater is installed on the fixing frame, the ceramic annular heater is installed on the sample shell through the fixing frame, a sealing opening is formed in the top of the sample shell, and a rubber sleeve is installed on the outer surface of the sealing cover. According to the utility model, not only can the efficient adsorption of MVOC be realized, but also the accuracy and the reliability of detection can be improved.

Description

TECHNICAL FIELD

[0001] The utility model relates to environmental monitoring technical field especially, it is a kind of optimization sample pretreatment device based on MVOC detection. BACKGROUND

[0002] MVOC is volatile organic compound produced in the microbial metabolic process, its kind and concentration can reflect the kind of microorganism, activity and environmental condition, therefore, MVOC detection has important application value in environmental monitoring, food safety, medical health and other fields.

[0003] Currently, MVOC detection usually uses gas chromatography-mass spectrometry (GC-MS) technology, however, due to the low concentration of MVOC, many kinds, volatile and other characteristics, sample pretreatment process is crucial to the accuracy and reliability of detection result, traditional sample pretreatment method, such as solid phase microextraction (SPME), purge and trap (Purge&Trap) etc., there is the problem of complicated operation, time-consuming, high cost, easy to pollute, it is difficult to meet the fast, efficient, sensitive MVOC detection demand. UTILITY MODEL CONTENT

[0004] In order to overcome the defects of prior art pointed out above, the present utility model person has made deep research, and after paying a lot of creative labor, the present utility model is completed.

[0005] Specifically, the technical problem to be solved by the present utility model is to provide an optimization sample pretreatment device based on MVOC detection to solve the above technical problems.

[0006] To solve the above technical problems, the present utility model provides the following technical scheme:

[0007] An optimization sample pretreatment device based on MVOC detection, comprising a sample cabin, the sample cabin is composed of a sample shell and a sealing cover;

[0008] The sample shell is provided with a gas pump, the gas pump is provided with a gas pipeline, and the gas pipeline is connected with the sample shell and forms a gas circulation loop, the gas pipeline is detachably provided with an adsorption tube, the adsorption tube is provided with a flowmeter, the outer surface of the adsorption tube is provided with a ceramic ring heater, and the ceramic ring heater is electrically connected with an external power switch through wires, the sample shell is provided with a fixing frame, the ceramic ring heater is installed on the fixing frame, and the ceramic ring heater is installed on the sample shell through the fixing frame.

[0009] As an improved technical scheme, the top of the sample shell is provided with a sealing opening, the outer surface of the sealing cover is provided with a rubber sleeve, and the sealing cover is installed on the sample shell through the rubber sleeve and the sealing opening.

[0010] As an improved technical scheme, the gas pipeline comprises an air inlet pipe, a connecting pipe and an air outlet pipe, one end of the air inlet pipe away from the air pump is connected with the sample shell, and the air inlet pipe is communicated with the sample shell.

[0011] The connecting pipe is installed at the end of the air pump away from the air inlet pipe, the flow meter is installed on the connecting pipe, the adsorption pipe is detachably installed between the connecting pipe and the air outlet pipe, and the adsorption pipe is communicated with the connecting pipe and the air outlet pipe.

[0012] The end of the air outlet pipe away from the adsorption pipe is connected with the sample shell, and the air outlet pipe is communicated with the sample shell.

[0013] As an improved technical scheme, one end of the adsorption pipe is provided with a first connecting head integrally formed, and the first connecting head is connected with the connecting pipe, and the other end of the adsorption pipe is provided with a second connecting head integrally formed, and the second connecting head is connected with the air outlet pipe.

[0014] As an improved technical scheme, the inner cavity of the adsorption pipe is filled with adsorption material.

[0015] As an improved technical scheme, the adsorption material is one or more of Tenax TA, carbon molecular sieve 1000 and carbon trap.

[0016] As an improved technical scheme, the material of the sample cabin is glass or stainless steel.

[0017] After the above technical scheme is adopted, the beneficial effects of the present application are as follows:

[0018] 1. The utility model discloses, through the sealed cover is through the sealed port and is placed into the sample shell with the sample to be measured, and is sealed to it in reset sealed cover, the sealed cover is sealed installation on the sample shell through the rubber sleeve and the sealed port at this moment, then starts the air pump, the input end of air pump is sucked to the air pump through the air inlet pipe with gas at this moment, and the gas is returned to the sample cabin through the adapter pipe, the adsorption pipe and the exhaust pipe, and the gas in the sample cabin is circulated, makes MVOC fully volatilize and fully contacts with the adsorption material, during this period, the flowmeter plays the role of monitoring the circulation flow of gas, after a certain time of adsorption, close the air pump, start the ceramic ring heater again and heat the adsorption pipe to desorb the MVOC of adsorption, finally take out the adsorption pipe, and the desorbed MVOC is introduced into the GC-MS and is analyzed, so that the efficient adsorption of MVOC can be realized, and the accuracy and reliability of detection can be improved.

[0019] 2. The utility model discloses, through the adsorption pipe is designed to be detachable replacement, can conveniently select the appropriate adsorption material according to different detection needs of user. BRIEF DESCRIPTION OF DRAWINGS

[0020] In order to more clearly illustrate the technical scheme of the utility model embodiment, the following will be to the drawing needed to be used in the embodiment description briefly introduced, obviously, the following description in the drawing is only some embodiments of the utility model, for those skilled in the art, under the premise of not paying the creative labor, still can obtain other drawings according to these drawings. Wherein:

[0021] Figure 1 It is the main view structural schematic drawing of the utility model.

[0022] Figure 2 It is the sample cabin opening state structural schematic drawing of the utility model.

[0023] Figure 3 It is the adsorption pipe structural schematic drawing of the utility model.

[0024] Figure 4 It is the adsorption pipe cut structure schematic drawing of the utility model.

[0025] BRIEF DESCRIPTION OF DRAWINGS

[0026] In the drawing: 1, sample shell;101, sealed port;2, sealed cover;201, rubber sleeve;3, air pump;4, air inlet pipe;5, adapter pipe;6, flowmeter;7, exhaust pipe;8, adsorption pipe;801, first adapter;802, second adapter;803, adsorption material;9, ceramic ring heater;10, fixed frame. DETAILED DESCRIPTION

[0027] The technical solutions in the embodiments of the present application will be clearly and completely described below with reference to the drawings in the embodiments of the present application. Obviously, the described embodiments are only part of the embodiments of the present application, rather than all the embodiments. Based on the embodiments of the present application, all other embodiments obtained by those skilled in the art without creative efforts fall within the scope of the present application.

[0028] It should be noted that all directional indications (such as up, down, left, right, front, back, etc.) in the embodiments of the present application are only used to explain the relative positional relationship, movement condition, etc. between components in a certain posture (as shown in the drawings), and the directional indications will change accordingly if the certain posture changes.

[0029] Meanwhile, "and / or" or "or / and" appearing throughout the text means that three schemes are included, taking "A and / or B" as an example, including A scheme, or B scheme, or A and B schemes are satisfied at the same time.

[0030] In addition, the description of "first", "second" and the like in the present application is only for the purpose of description, and cannot be understood as indicating or implying the relative importance of the indicated technical features or implicitly indicating the number of the indicated technical features. Therefore, the features limited by "first", "second" can be explicitly or implicitly included at least one of the features. In addition, the technical solutions of each embodiment can be combined with each other, but it must be based on the realization of ordinary skilled in the art, when the combination of technical solutions appears contradictory or unachievable, it should be considered that the combination of technical solutions does not exist, and is not within the protection scope required by the present application.

[0031] Referring to Figures 1-4 , a sample pretreatment device is provided based on MVOC detection, the sample pretreatment device comprises a sample cabin composed of a sample shell 1 and a sealing cover 2;

[0032] A gas pump 3 is installed on the sample shell 1, a gas pipeline is installed on the gas pump 3, the gas pipeline is connected with the sample shell 1 and forms a gas circulation loop, a suction pipe 8 is detachably installed on the gas pipeline, a flow meter 6 is installed on the suction pipe 8, the flow meter 6 is used for monitoring the flow of the gas circulation, a ceramic ring heater 9 is sleeved and installed on the outer surface of the suction pipe 8, and the ceramic ring heater 9 is electrically connected with an external power switch through an electric wire, a fixing frame 10 is installed on the sample shell 1, the ceramic ring heater 9 is installed on the fixing frame 10, and the ceramic ring heater 9 is installed on the sample shell 1 through the fixing frame 10.

[0033] Referring to Figure 1 and Figure 2The top of the sample shell 1 is provided with a sealing port 101, and the outer surface of the sealing cover 2 is provided with a rubber sleeve 201, so that the sealing cover 2 is sealingly installed on the sample shell 1 through the rubber sleeve 201 and the sealing port 101.

[0034] Referring to Figure 1 and Figure 2 , the gas pipeline includes an air inlet pipe 4, a connecting pipe 5 and an air outlet pipe 7, the air inlet pipe 4 is connected to the sample shell 1 away from the air pump 3, and the air inlet pipe 4 is in communication with the sample shell 1.

[0035] The connecting pipe 5 is installed on the air pump 3 away from the air inlet pipe 4, the flow meter 6 is installed on the connecting pipe 5, and the adsorption pipe 8 is detachably installed between the connecting pipe 5 and the air outlet pipe 7, and the adsorption pipe 8 is in communication with the connecting pipe 5 and the air outlet pipe 7.

[0036] The air outlet pipe 7 is connected to the sample shell 1 away from the adsorption pipe 8, and the air outlet pipe 7 is in communication with the sample shell 1, so as to form a gas circulation loop.

[0037] Referring to Figure 1 , Figure 3 and Figure 4 , one end of the adsorption pipe 8 is provided with a first adapter 801 integrally formed, and the first adapter 801 is connected to the connecting pipe 5, and the other end of the adsorption pipe 8 is provided with a second adapter 802 integrally formed, and the second adapter 802 is connected to the air outlet pipe 7, so that the adsorption pipe 8 is detachably installed between the connecting pipe 5 and the air outlet pipe 7.

[0038] Referring to Figure 3 and Figure 4 , the inner cavity of the adsorption pipe 8 is filled with adsorption material 803, so as to adsorb MVOC.

[0039] Referring to Figure 3 and Figure 4 , the adsorption material 803 is one or more of Tenax TA, carbon molecular sieve 1000 and carbon trap, so as to select the appropriate adsorption material 803 according to actual needs.

[0040] Referring to Figure 1 and Figure 2 , the material of the sample cabin is glass or stainless steel, so as to hold the sample to be tested and provide a sealed environment.

[0041] In actual use, the sample to be measured is put into the sample shell 1 through the sealed port 101 by opening the sealing cover 2, and the sealing cover 2 is sealed by resetting the sealing cover 2, at this time the sealing cover 2 is sealed and installed on the sample shell 1 through the rubber sleeve 201 and the sealed port 101, then the air pump 3 is started, at this time the input end of the air pump 3 sucks gas into the air pump 3 through the air inlet pipe 4, and the gas is discharged back to the sample cabin through the connecting pipe 5, the adsorption pipe 8 and the exhaust pipe 7, at the same time, the gas in the sample cabin is circulated to make the MVOC fully volatilize and fully contact with the adsorption material 803, during which the flow meter 6 plays a role in monitoring the circulation flow of the gas, after a certain time of adsorption, the air pump 3 is closed, and the ceramic ring heater 9 is started to heat the adsorption pipe 8 to desorb the adsorbed MVOC, finally the adsorption pipe 8 is taken out, and the desorbed MVOC is introduced into a gas chromatography-mass spectrometry (GC-MS) for analysis, so that the efficient adsorption of MVOC can be realized, and the accuracy and reliability of detection can be improved.

[0042] The utility model provides a kind of based on MVOC detection time optimization sample pretreatment device, by the cooperation of the mode of gas circulation and ceramic ring heater 9, the MVOC release situation under different environmental conditions can be simulated, and the efficient adsorption of MVOC is realized, and the accuracy and reliability of detection are improved.

[0043] It should be understood that the use of these embodiments is only for illustrating the utility model and is not intended to limit the scope of protection of the utility model. In addition, it should also be understood that after reading the technical content of the utility model, those skilled in the art can make various changes, modifications and / or variations to the utility model, and all these equivalent forms also fall within the protection scope defined by the claims attached to the present application.

Claims

1. An optimized sample pretreatment device for MVOC detection, characterized in that: Includes a sample chamber, which is composed of a sample shell (1) and a sealing cover (2); An air pump (3) is installed on the sample housing (1). A gas pipe is installed on the air pump (3) and the gas pipe is connected to the sample housing (1) to form a gas circulation loop. An adsorption tube (8) is detachably installed on the gas pipe. A flow meter (6) is installed on the adsorption tube (8). A ceramic ring heater (9) is sleeved on the outer surface of the adsorption tube (8) and the ceramic ring heater (9) is electrically connected to an external power switch via a wire. A fixing frame (10) is installed on the sample housing (1). The ceramic ring heater (9) is installed on the fixing frame (10) and the ceramic ring heater (9) is installed on the sample housing (1) via the fixing frame (10).

2. The optimized sample pretreatment device for MVOC detection according to claim 1, characterized in that: The sample housing (1) has a sealing port (101) at the top, and a rubber sleeve (201) is installed on the outer surface of the sealing cover (2). The sealing cover (2) is installed on the sample housing (1) through the rubber sleeve (201) and the sealing port (101).

3. The optimized sample pretreatment device for MVOC detection according to claim 2, characterized in that: The gas pipeline includes an inlet pipe (4), a connecting pipe (5), and an exhaust pipe (7). The end of the inlet pipe (4) away from the gas pump (3) is connected to the sample housing (1), and the inlet pipe (4) is connected to the sample housing (1). The connecting pipe (5) is installed at the end of the air pump (3) away from the air inlet pipe (4), the flow meter (6) is installed on the connecting pipe (5), the adsorption pipe (8) is detachably installed between the connecting pipe (5) and the exhaust pipe (7), and the adsorption pipe (8) is connected to both the connecting pipe (5) and the exhaust pipe (7); The end of the exhaust pipe (7) away from the adsorption pipe (8) is connected to the sample housing (1), and the exhaust pipe (7) is in communication with the sample housing (1).

4. The optimized sample pretreatment device for MVOC detection according to claim 3, characterized in that: One end of the adsorption tube (8) has an integrally formed first connector (801), and the first connector (801) is connected to the connector (5). The other end of the adsorption tube (8) has an integrally formed second connector (802), and the second connector (802) is connected to the exhaust pipe (7).

5. The optimized sample pretreatment device for MVOC detection according to claim 3, characterized in that: The inner cavity of the adsorption tube (8) is filled with adsorption material (803).

6. The optimized sample pretreatment device for MVOC detection according to claim 5, characterized in that: The adsorbent material (803) is one or more of the following: TENEX TA, carbon molecular sieve 1000, and carbon trap.

7. The optimized sample pretreatment device for MVOC detection according to claim 1, characterized in that: The sample chamber is made of glass or stainless steel.

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