Soil VOC (volatile organic compound) online monitor

Abstract

The utility model provides a soil VOC (Volatile Organic Compounds) online monitor which comprises a shell, a sampling module, a monitoring module, a control module, an adsorption module, a conveying module and a power supply module, the sampling module is used for being inserted into soil to collect soil gas; the monitoring module is used for detecting the concentration of a soil gas component; the adsorption module is provided with a temperature control part for cooling and heating soil gas; the conveying module is provided with an air inlet pipe communicated with the sampling module, a breather pipe communicated with the temperature control part and the control module, an air guide pipe communicated with the control module and the monitoring module, and an air outlet pipe communicated with the outside of the shell and the monitoring module; the air inlet pipe is provided with a first flow dividing pipe communicated with the control module and a second flow dividing pipe communicated with the temperature control part, and the control module is used for controlling opening and closing of the first flow dividing pipe and the ventilation pipe; an air pump is mounted on the air outlet pipe; the power supply module is used for supplying power. The utility model has the effect of high accuracy.

Description

TECHNICAL FIELD

[0001] The utility model belongs to the technical field of soil gas monitoring, and specifically relates to a soil VOC on-line monitor. BACKGROUND

[0002] VOC (volatile organic compounds) is a kind of organic matter that is easy to volatilize and can be mixed with air at normal temperature and pressure, in soil, VOC mainly comes from improper handling of industrial waste, excessive use of pesticides and fertilizers and oil and gas leakage etc. These VOCs accumulate in the soil, not only affect the soil quality, but also may enter the atmosphere and groundwater through volatilization, percolation and other ways, and pose a threat to the ecological environment.

[0003] Soil VOC on-line monitor is one of the important means to solve the current soil pollution problem, and soil VOC on-line monitoring can continuously and real-timely monitor the VOC concentration change in soil, can timely find the pollution source and take effective measures for management.

[0004] In the case of low VOC concentration in soil gas, it is impossible to accurately measure or even detect these low-concentration VOCs, which may lead to misjudgment or omission of pollution conditions, and affect the accuracy of monitoring results. UTILITY MODEL CONTENT

[0005] The utility model embodiment provides a kind of soil VOC on-line monitor, to solve the technical problem of low accuracy of monitoring result.

[0006] To achieve the above object, the technical scheme adopted by the utility model is as follows: provide a kind of soil VOC on-line monitor, including shell, the shell has with the vent that communicates with outside, still include:

[0007] Sampling module is inserted into soil and collects soil gas;

[0008] Monitoring module is arranged in the shell, and is used to detect the concentration of soil gas composition;

[0009] Control module is arranged in the shell;

[0010] Adsorption module has temperature control part for cooling and heating soil gas;

[0011] Conveying module has air inlet pipe that communicates with the sampling module, vent pipe that is communicated between the temperature control part and the control module, air guide pipe that is communicated between the control module and the monitoring module, and air outlet pipe that is communicated between the shell and the monitoring module;The air inlet pipe has first shunt pipe that is communicated with the control module and second shunt pipe that is communicated with the temperature control part, and the control module is used to control the opening and closing of first shunt pipe and vent pipe;Air pump is installed on the air outlet pipe;

[0012] A power supply module is arranged in the shell and used for supplying power to the sampling module, the monitoring module, the control module, the adsorption module and the conveying module.

[0013] When the parameter of the soil gas to be detected is higher than the preset value, the ventilation pipe is closed, and the soil gas sequentially passes through the air inlet pipe, the first shunt pipe, the air guide pipe and the air outlet pipe; when the parameter of the soil gas to be detected is lower than or equal to the preset value, the first shunt pipe is closed, and the soil gas sequentially passes through the air inlet pipe, the second shunt pipe, the ventilation pipe, the air guide pipe and the air outlet pipe.

[0014] In some possible implementation manners, the temperature control part comprises an adsorption chamber and a temperature adjusting member; the adsorption chamber is filled with activated carbon; and the temperature adjusting member is fixed to a side wall of the adsorption chamber.

[0015] The ventilation pipe and the second shunt pipe are both in communication with the adsorption chamber.

[0016] In some possible implementation manners, the power supply module comprises a power adapter and a battery pack, and the battery pack can store electric energy.

[0017] When the soil VOC online monitor needs to be continuously monitored, the power adapter is electrically connected to an external power supply for power supply; and when the soil VOC online monitor needs to be monitored in a portable mode, the battery pack is used for power supply.

[0018] In some possible implementation manners, the soil VOC online monitor further comprises a supporting module, the supporting module comprises a supporting part, and the shell is detachably connected to the supporting part.

[0019] A handle is fixed to a top end of the shell.

[0020] In some possible implementation manners, the power supply module further comprises a cooling part, and the cooling part is fixed to a side wall of the power adapter.

[0021] In some possible implementation manners, the monitoring module comprises:

[0022] The air chamber has a monitoring cavity in communication with the air guide pipe and the air outlet pipe, and a plurality of mounting cavities, the mounting cavities are open on a side away from the monitoring cavity, and a side facing the monitoring cavity is provided with a contact hole in communication with the monitoring cavity;

[0023] The mounting frame is detachably connected to the air chamber and located on the side of the mounting cavities away from the monitoring cavity.

[0024] A plurality of monitoring parts are fixed on the mounting frame, and the monitoring parts are inserted into the mounting cavities one by one, and each monitoring part is in contact with soil gas in the monitoring cavity through the contact hole;

[0025] A drying part is used for drying and dehumidifying soil gas entering the monitoring cavity.

[0026] In some possible implementation manners, the mounting cavities are communicated, and the drying part comprises:

[0027] A plurality of heat equalizing rings are arranged in the mounting cavities one by one, each heat equalizing ring is sleeved on the outer periphery of the monitoring part in the same mounting cavity, and the heat equalizing rings in adjacent two mounting cavities are fixedly connected.

[0028] A heating belt is sleeved on the outer periphery of the heat equalizing rings.

[0029] In some possible implementation manners, the air chamber is provided with an air inlet channel and an air outlet channel which are communicated with the monitoring cavity, two protrusions are fixed on the inner wall of the monitoring cavity, one of the protrusions is located at the air outlet end of the air outlet channel, and the other protrusion is located at the air inlet end of the air outlet channel.

[0030] In some possible implementation manners, the sampling module comprises:

[0031] A cannula is provided with a pointed end for breaking soil at one end and a stress disc at the other end, and a through hole is formed in the outer wall of the cannula and communicated with the inner cavity of the cannula.

[0032] A connecting pipe is connected between the insertion section and the air inlet pipe.

[0033] In some possible implementation manners, the adsorption module further comprises an air duct communicated with the outside and a heat dissipation assembly communicated with the air duct, the air duct is a hollow pipe, and the heat dissipation assembly is arranged in the shell.

[0034] Compared with the prior art, the utility model has the advantages that:

[0035] When the VOC concentration in the soil gas is lower than or equal to a preset value, the air pipe is opened, the first shunt pipe is closed, the soil gas collected by the sampling module enters the temperature control part through the second shunt pipe under the control of the control module, and the VOC concentration in the soil gas is expanded by switching back and forth between cooling and heating of the soil gas, so that the VOC in the soil gas can also be detected when the VOC concentration in the soil gas is low, the phenomenon of misjudgment or omission of pollution is reduced, and the accuracy of the monitoring result is improved; when the VOC in the soil gas is higher than the preset value, the first shunt pipe is opened, the air pipe is closed, and the soil gas collected by the sampling module enters the monitoring module through the first shunt pipe and the air guide pipe under the control of the control module to detect the concentration of the soil gas composition, at this time, the VOC concentration in the soil gas does not need to be expanded in the temperature control part, energy is saved, and cost is reduced. BRIEF DESCRIPTION OF DRAWINGS

[0036] Figure 1 A structure diagram for embodying a shell and a supporting module is provided for the embodiment of the utility model;

[0037] Figure 2 A structure diagram for embodying the inside of a shell is provided for the embodiment of the utility model;

[0038] Figure 3 A structure diagram for embodying an adsorption module, a conveying module and a power supply module is provided for the embodiment of the utility model;

[0039] Figure 4 A flow diagram for embodying the flow direction of soil gas is provided for the embodiment of the utility model;

[0040] Figure 5 An exploded diagram for embodying the structure of a temperature control part is provided for the embodiment of the utility model;

[0041] Figure 6 A partial sectional view for embodying the detachable connection mode of a shell and a supporting part is provided for the embodiment of the utility model;

[0042] Figure 7 A sectional view for embodying the structure of a monitoring module is provided for the embodiment of the utility model;

[0043] Figure 8 A Figure 7 A partial enlarged diagram of part A;

[0044] Figure 9 A sectional view for embodying the positions of a heating belt and a heat equalizing ring is provided for the embodiment of the utility model;

[0045] Figure 10 A structure diagram for embodying a sampling module is provided for the embodiment of the utility model.

[0046] BRIEF DESCRIPTION OF DRAWINGS:

[0047] 1, shell; 11, air vent; 12, handle; 13, rain cover; 14, dust cover; 15, temperature control plate;

[0048] 2, control module;

[0049] 3, adsorption module; 31, temperature control part; 311, adsorption chamber; 3111, heat insulation sheet; 3112, heat preservation cotton; 312, temperature adjusting piece; 32, heat dissipation assembly; 33, air duct;

[0050] 4, conveying module; 41, air inlet pipe; 411, first shunt pipe; 412, second shunt pipe; 42, air pipe; 43, air guide pipe; 44, air outlet pipe; 441, air pump;

[0051] 5, power supply module; 51, power adapter; 52, battery pack; 521, lithium battery; 522, charging plate; 53, cooling part;

[0052] 6, support module; 61, support part; 62, assembly part; 621, mounting block; 622, mounting rod; 623, limiting rod; 6231, knob;

[0053] 7, monitoring module; 71, air chamber; 711, mounting cavity; 712, air inlet cavity; 713, air outlet cavity; 714, protrusion; 715, air hole; 716, temperature and humidity sensor; 717, monitoring cavity; 718, contact hole; 72, mounting frame; 73, monitoring part; 731, sensor; 732, sealing ring; 74, drying part; 741, heating belt; 742, heat equalizing ring; 75, air inlet rod; 76, air outlet rod;

[0054] 8, sampling module; 81, cannula; 811, tip; 812, stress disc; 813, through hole; 82, connecting pipe. DETAILED DESCRIPTION

[0055] In order to make the technical problems, technical schemes and beneficial effects to be solved by the utility model more clear and obvious, the utility model will be further described in detail below in combination with the drawings and examples. It should be understood that the specific examples described herein are only used to explain the utility model, and are not used to limit the utility model.

[0056] Please see Figures 1 to 10The utility model discloses soil VOC on -line monitoring appearance makes an explanation. Soil VOC on -line monitoring appearance, including casing 1, sampling module 8, monitoring module 7, control module 2, adsorption module 3, conveying module 4 and power module 5, casing 1 has the vent 11 with outside communication, sampling module 8 is used for inserting the soil gas collection in soil, monitoring module 7 is used for detecting the concentration of soil gas composition component, adsorption module 3 has the temperature control part 31 of soil gas cooling and heating, conveying module 4 has the air inlet pipe 41 of communication sampling module 8, the vent pipe 42 of communication in temperature control part 31 and control module 2, the air guide pipe 43 of communication in control module 2 and monitoring module 7, and the air outlet pipe 44 of communication casing 1 outside and monitoring module 7, air inlet pipe 41 has the first shunt pipe 411 of communication with control module 2 and the second shunt pipe 412 of communication with temperature control part 31, control module 2 is used for controlling the opening and closing of first shunt pipe 411 and vent pipe 42, air pump 441 is installed on air outlet pipe 44, power module 5 is used for the power supply of sampling module 8, monitoring module 7, control module 2, adsorption module 3 and conveying module 4.

[0057] Wherein, soil gas to be detected parameter (namely VOC concentration in soil gas) is higher than preset value, in turn through air inlet pipe 41, first shunt pipe 411, air guide pipe 43 and air outlet pipe 44, soil gas to be detected parameter is lower than or equal to preset value, in turn through air inlet pipe 41, second shunt pipe 412, vent pipe 42, air guide pipe 43 and air outlet pipe 44.

[0058] Specifically, control module 2 can be three-way electromagnetic valve.

[0059] The soil VOC on -line monitoring appearance provided in the embodiment compares with prior art:

[0060] When VOC concentration in soil gas is lower than or equal to preset value (at this time VOC concentration in soil gas is mainly judged roughly by artificial), first shunt pipe 411 is closed, vent pipe 42 is opened, the soil gas collected by sampling module 8 enters by air inlet pipe 41, after entering control module 2 through second shunt pipe 412, it flows into temperature control part 31 through second shunt pipe 412, and the concentration of VOC in soil gas is enlarged by back and forth switching of cooling and heating of soil gas, so that VOC in soil gas can also be detected when VOC concentration in soil gas is relatively low, reduces the phenomenon of misjudgment or omission to pollution condition, improves the accuracy of monitoring result, when VOC concentration in soil gas is higher than preset value, first shunt pipe 411 is opened, vent pipe 42 is closed, the soil gas collected by sampling module 8 enters monitoring module 7 through first shunt pipe 411 and air guide pipe 43 under the control of control module 2 and carries out the detection of soil gas composition component concentration, at this time, it is not needed to enter temperature control part 31 and enlarge the concentration of VOC in soil gas, saves energy and reduces cost.

[0061] In some embodiments, referring toFigure 3 and Figure 5 The temperature control part 31 comprises an adsorption chamber 311 and a temperature adjusting part 312. The adsorption chamber 311 is filled with activated carbon. The temperature adjusting part 312 is fixed to the side wall of the adsorption chamber 311. The air pipe 42 and the second shunt pipe 412 are both in communication with the adsorption chamber 311.

[0062] Specifically, the temperature adjusting part 312 can be a semiconductor refrigeration sheet. The side wall of the adsorption chamber 311 opposite to the temperature adjusting part 312 is fixed with a heat insulation sheet 3111. The adsorption chamber 311 is wrapped with thermal insulation cotton 3112, but the thermal insulation cotton 3112 does not wrap the temperature adjusting part 312.

[0063] The temperature adjusting part 312 has a first working temperature and a second working temperature. The activated carbon is controlled to switch between the first working temperature and the second working temperature. The first working temperature is between 23℃ and 26℃, and the second working temperature is between 92℃ and 96℃. Thus, the low-concentration VOC to-be-measured gas can be concentrated and enriched, so as to facilitate more accurate measurement. At the same time, the impurities adsorbed in the activated carbon during long-term use can be effectively removed, so as to ensure the purity of the zero point when measuring low concentration and reduce the occurrence of zero point background concentration problems.

[0064] In some embodiments, referring to Figure 2 and Figure 3 The power supply module 5 comprises a power adapter 51 and a battery pack 52. The battery pack 52 can store electric energy. When the soil VOC online monitor needs to be continuously monitored, the power adapter 51 is electrically connected to an external power supply for power supply. When the soil VOC online monitor needs to be monitored in a portable manner, the battery pack 52 is used for power supply.

[0065] Specifically, the battery pack 52 comprises a lithium battery 521 and a charging plate 522. The lithium battery 521 and the charging plate 522 are electrically connected. The charging plate 522 is externally connected to a power supply to charge and store energy in the lithium battery 521. The stored energy can be used for power supply when the soil VOC online monitor is monitored in a portable manner.

[0066] In some embodiments, referring to Figure 1 and Figure 6 The soil VOC online monitor further comprises a support module 6. The support module 6 comprises a support part 61. The shell 1 is detachably connected to the support part 61. The top end of the shell 1 is fixed with a handle 12.

[0067] Specifically, the support part 61 can be selected as a support or a tripod, and the support module 6 further comprises an assembling part 62, the assembling part 62 comprises a mounting block 621, a mounting rod 622 and a limiting rod 623, the mounting block 621 is fixedly arranged on the top of the support part 61, a mounting hole is formed on the side of the mounting block 621 away from the support part 61, the mounting rod 622 is fixedly arranged on the bottom of the shell 1, the mounting rod 622 is inserted into the mounting hole in a matched mode, the limiting rod 623 is threadedly connected with the mounting block 621, one end of the limiting rod 623 extends into the mounting hole and abuts against the mounting rod 622, and the other end of the limiting rod 623 is fixedly provided with a knob 6231.

[0068] When the soil VOC online monitor needs to be continuously monitored, the shell 1 is fixed on the support part 61 through the assembling part 62, and the shell 1 is stably kept through the support of the support part 61; when the soil VOC online monitor needs to be portably monitored, the shell 1 is removed from the support part 61, and then the shell 1 can be lifted through the handle 12, so that the shell 1 is moved.

[0069] In some embodiments, referring to Figure 3 The power supply module 5 further comprises a cooling part 53, and the cooling part 53 is fixedly arranged on the side wall of the power adapter 51.

[0070] Specifically, the cooling part 53 can be a condenser temperature control plate, and the cooling part 53 can also be a fan; when the cooling part 53 is the condenser temperature control plate, the condenser temperature control plate is directly fixedly arranged on the outer wall of the power adapter 51; when the cooling part 53 is the fan, a plurality of fans are arranged, the plurality of fans can be directly fixedly arranged on the outer wall of the power adapter 51, and a separation frame can be further fixedly arranged between the fan and the power adapter 51, and the separation frame is of a hollow type.

[0071] The temperature of the power adapter 51 during work can be reduced through the cooling part 53, the battery pack 52 can also be selected to have the same cooling mode as the power adapter 51, so that the temperature of the internal environment of the shell 1 is reduced, and the influence on the monitoring module 7 is reduced,

[0072] In some embodiments, referring to Figure 1 and Figure 2 The outer wall of the shell 1 is fixedly provided with a rain cover 13 at the air inlet 11, and a dust cover 14 is fixedly arranged in the shell 1, the top and the bottom of the dust cover 14 are provided with through holes, and the dust cover 14 covers the cooling part 53.

[0073] The dust cover 14 is arranged to reduce the dust from the outside into the shell 1, and the rain cover 13 is arranged to reduce the rainwater from the outside into the shell 1, so that the influence of the dust and the rainwater on the components in the shell 1 is reduced.

[0074] In some embodiments, referring to Figure 7 and Figure 8The monitoring module 7 comprises an air chamber 71, a mounting frame 72, a plurality of monitoring parts 73 and a drying part 74. The air chamber 71 has a monitoring cavity 717 communicated between the air inlet pipe 43 and the air outlet pipe 44, and a plurality of mounting cavities 711. The mounting cavities 711 are open at a side away from the monitoring cavity 717, and a contact hole 718 communicated with the monitoring cavity 717 is arranged at a side of the mounting cavities 711 facing the monitoring cavity 717. The mounting frame 72 is detachably connected with the air chamber 71 and located at the side of the mounting cavities 711 away from the monitoring cavity 717. The plurality of monitoring parts 73 are fixedly arranged on the mounting frame 72, and the plurality of monitoring parts 73 are inserted into the plurality of mounting cavities 711 one by one. Each monitoring part 73 is in contact with the soil air in the monitoring cavity 717 through the contact hole 718. The drying part 74 is used for drying and dehumidifying the soil air entering the monitoring cavity 717.

[0075] Specifically, the monitoring part 73 comprises a sensor 731 and a sealing ring 732, and the sealing ring 732 is sleeved on the outer periphery of the sensor 731.

[0076] The concentration of VOC in the soil air is detected by the sensor 731, and the moisture in the soil air is removed by the drying part 74 during the detection process, so as to reduce the influence of humidity on the sensor 731.

[0077] In the same monitoring module, the parameters monitored by the plurality of sensors 731 are different. For example, two sensors are provided, which are a PID sensor and a photoelectric sensor. The PID optical sensor has high measurement performance for olefins, and the electrochemical sensor has better response for alkanes and alcohol substances. The two sensors 731 have different tendencies and can detect different types of VOC substances, so as to expand the detection surface by composite measurement.

[0078] In some embodiments, referring to Figure 3 , Figures 7 to 9 The plurality of mounting cavities 711 are communicated, the drying part 74 comprises a heating belt 741 and a plurality of heat equalizing rings 742, the plurality of heat equalizing rings 742 are arranged in the plurality of mounting cavities 711 one by one, each heat equalizing ring 742 is sleeved on the outer periphery of the monitoring part 73 in the same mounting cavity 711, and the heat equalizing rings 742 in the adjacent two mounting cavities 711 are fixedly connected. The heating belt 741 is sleeved on the outer periphery of the plurality of heat equalizing rings 742.

[0079] It should be noted that the plurality of mounting cavities 711 can be arranged in a straight line or in other arrangements.

[0080] Specifically, the shell 1 is fixedly provided with a temperature control plate 15, the temperature control plate 15 is electrically connected with the heating belt 741, and the temperature control plate 15 is used for heating the heating belt 741. The heat equalizing ring 742 is made of red copper.

[0081] The heat of the heating belt 741 is evenly distributed around the outer periphery of the monitoring part 73 by the heat-distributing ring 742, thereby uniformly warming the soil air in the monitoring cavity 717, and thus uniformly reducing the humidity of the soil air; and the heat-distributing ring 742 is made of red copper, which has good heat conductivity, thereby improving the drying effect.

[0082] In some embodiments, referring to Figure 7 , the air chamber 71 is provided with an air inlet passage 712 and an air outlet passage 713 which communicate with the monitoring cavity 717, and two protrusions 714 are fixedly arranged on the inner wall of the monitoring cavity 717, one of which is located at the air outlet end of the air outlet passage 712, and the other of which is located at the air inlet end of the air outlet passage 713.

[0083] Specifically, the monitoring module 7 further comprises a hollow air inlet rod 75 and a hollow air outlet rod 76, both ends of the air inlet rod 75 are provided with tapered surfaces, one end of the air inlet rod 75 is inserted into the air inlet cavity 712, and the other end of the air inlet rod 75 is inserted into the air guide pipe 43, the air inlet rod 75 is threadedly connected with the air chamber 71, and the outer periphery of the tapered surface of the air inlet rod 75 inserted into the air guide pipe 43 is provided with a ridge; both ends of the air outlet rod 76 are also provided with tapered surfaces, one end of the air outlet rod 76 is inserted into the air inlet cavity 712, and the other end of the air outlet rod 76 is inserted into the air outlet pipe 44, the air outlet rod 76 is threadedly connected with the air chamber 71, and the outer periphery of the tapered surface of the air outlet rod 76 inserted into the air outlet pipe 44 is provided with a ridge.

[0084] The air chamber 71 is provided with a gas permeable hole 715 which communicates with the monitoring cavity 717 at the side away from the mounting cavity 711, and the air chamber 71 is provided with a temperature and humidity sensor 716 at the gas permeable hole 715. The humidity of the soil air entering the monitoring cavity 717 is monitored by the temperature and humidity sensor 716, thereby controlling the temperature of the drying part 74.

[0085] The protrusions 714 are arranged to prolong the travel route of the soil air, thereby making the soil air fully contact with the monitoring part 73, and thus improving the detection accuracy of the monitoring; the tapered surfaces are arranged at both ends of the air inlet rod 75 and the air outlet rod 76 to reduce the difficulty of insertion; and the ridges are arranged on the tapered surfaces to increase the friction between the air inlet rod 75 and the air guide pipe 43 and between the air outlet rod 76 and the air outlet pipe 44, thereby reducing the possibility of the air inlet rod 75 and the air outlet rod 76 falling off.

[0086] In some embodiments, referring to Figure 2 and Figure 10 , the sampling module 8 comprises a cannula 81 and a connecting pipe 82; one end of the cannula 81 is provided with a pointed end 811 for breaking the soil, and the other end is fixedly provided with a stress disc 812, the outer wall of the cannula 81 is provided with a through hole 813 which communicates with the inner cavity of the cannula 81, and the connecting pipe 82 is connected between the cannula 81 and the air inlet pipe 41.

[0087] Specifically, the through hole 813 is arranged at the pointed end 811 of the cannula 81 and the outer periphery of the cannula 81.

[0088] When the insertion tube 81 is inserted into the soil, the insertion tube 81 can be inserted into the soil by hitting the stress disc 812, so as to avoid damage of the insertion tube 81 caused by hitting.

[0089] In some embodiments, referring to Figure 2 , the adsorption module 3 further comprises an air duct 33 in communication with the outside and a heat dissipation assembly 32 in communication with the air duct 33, the air duct 33 is a hollow pipe, and the heat dissipation assembly 32 is arranged in the shell 1.

[0090] The air duct can be installed on one side of the temperature control part, and the heat dissipation assembly 32 is arranged inside the air duct 33 or at the end of the air duct 33, so that the heat dissipation assembly 32 is mainly used for dissipating heat of the temperature control part 31; or the air duct 33 and the temperature control part 31 are arranged in the shell 1 in a spaced manner, so that the heat dissipation assembly 32 is mainly used for dissipating heat of the internal environment of the shell 1.

[0091] Specifically, a through slot in communication with the outside is formed in the bottom of the shell 1, the heat dissipation assembly 32 can be a fan, the heat dissipation assembly 32 abuts against the temperature control part 31, one end of the air duct 33 is fixed at the air outlet of the heat dissipation assembly 32, the other end of the air duct 33 is aligned with the through slot, a connecting piece is fixedly arranged on the outer periphery of the air duct 33, and the connecting piece is detachably connected with the shell 1.

[0092] The above only describes the preferred embodiments of the utility model and is not used to limit the utility model, and any modification, equivalent replacement and improvement within the spirit and principle of the utility model should be included in the protection scope of the utility model.

Claims

1. A soil VOC on-line monitor characterized in that, The soil VOC online monitor comprises a shell, an air inlet, a sampling module, a monitoring module, a control module, an adsorption module, a conveying module, and a power supply module. The sampling module is used for inserting into soil and collecting soil gas. The monitoring module is arranged in the shell and is used for detecting the concentration of soil gas composition. The control module is arranged in the shell. The adsorption module has a temperature control part for cooling and heating soil gas. The conveying module has an air inlet pipe connected to the sampling module, an air pipe connected between the temperature control part and the control module, a gas guide pipe connected between the control module and the monitoring module, and an air outlet pipe connected between the shell and the monitoring module. The air inlet pipe has a first shunt pipe connected to the control module and a second shunt pipe connected to the temperature control part. The control module is used for controlling the opening and closing of the first shunt pipe and the air pipe.

2. The soil VOC on-line monitor according to claim 1, wherein, The air outlet pipe is provided with an air pump. The power supply module is arranged in the shell and is used for supplying power to the sampling module, the monitoring module, the control module, the adsorption module, and the conveying module.

3. The soil VOC on-line monitor of claim 1, wherein, When the parameter of soil gas to be detected is higher than a preset value, the air pipe is closed, and soil gas passes through the air inlet pipe, the first shunt pipe, the gas guide pipe, and the air outlet pipe in sequence.

4. The soil VOC on-line monitor according to claim 3, wherein, When the parameter of soil gas to be detected is lower than or equal to the preset value, the first shunt pipe is closed, and soil gas passes through the air inlet pipe, the second shunt pipe, the air pipe, the gas guide pipe, and the air outlet pipe in sequence.

5. The soil VOC on-line monitor of claim 1, wherein, The temperature control part comprises an adsorption chamber and a temperature adjusting member. The temperature adjusting member is fixedly arranged on the side wall of the adsorption chamber.

6. The on-line soil VOC monitor of claim 1, wherein, The air pipe and the second shunt pipe are connected to the adsorption chamber. The power supply module comprises a power adapter and a battery pack. The power supply module further comprises a cooling part. The soil VOC online monitor further comprises a support module. The top end of the shell is fixedly provided with a handle.

7. The on-line soil VOC monitor of claim 6, wherein, The monitoring module comprises a gas chamber, a plurality of mounting cavities, and a plurality of monitoring parts. The mounting cavities are open on the side away from the monitoring cavity and are provided with contact holes connected to the monitoring cavity on the side facing the monitoring cavity. The mounting cavities are connected to each other. The temperature adjusting member comprises a plurality of heating rings and a heating belt. The heating rings are arranged in the mounting cavities one by one. The heating belt is sleeved on the outer periphery of the heating rings.

8. The on-line soil VOC monitor of claim 6, wherein, The gas chamber is provided with an air inlet channel and an air outlet channel which communicate with the monitoring cavity, and two protrusions are fixed on the inner wall of the monitoring cavity, one of which is located at the air outlet end of the air outlet channel and the other is located at the air inlet end of the air outlet channel.

9. The soil VOC on-line monitor of claim 1, wherein, The sampling module comprises: A pipe is provided with a pointed end for breaking soil at one end and a force receiving disc at the other end, and a through hole is formed in the outer wall of the pipe and communicates with the inner cavity of the pipe. A connecting pipe is connected between the pipe and the air inlet pipe.

10. The soil VOC on-line monitor of claim 1, wherein, The adsorption module further comprises an air duct which communicates with the outside and a heat dissipation assembly which communicates with the air duct.

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