Plant leaf VOCs sampling device

Abstract

The invention relates to the technical field of plant leaf gas collection devices, in particular to a plant leaf VOCs sampling device which comprises a leaf chamber assembly, an air conditioner assembly, a CO2 tank, a ventilator, a first air inlet pipe, a first air outlet pipe, a second air outlet pipe, a sampling pump, a humidifier and a main machine. According to the device, the temperature, humidity, illumination and air composition conditions in the leaf chamber can be adjusted according to actual conditions, and transient and low-concentration plant leaf VOCs can be accurately captured under the condition that leaves are not affected; the device is simple in structure, convenient to operate, reasonable in design, low in failure rate and low in maintenance cost, and the loading plate is convenient to mount, dismount and clean.

Description

Technical Field

[0001] The invention relates to the technical field of plant leaf gas sampling devices, and in particular to a plant leaf VOCs sampling device. Background Art

[0002] Plant volatile gases (VOCs) are low-boiling-point, volatile non-methane hydrocarbons produced by plants through secondary metabolic pathways. Due to their strong chemical activity and high total emissions, plant VOCs have an important impact on atmospheric photochemical processes, air quality, and global climate. The production of plant VOCs is closely related to plant physiological and biochemical processes. Therefore, factors such as light intensity, temperature, moisture, and nutrient supply will have an impact on VOCs, especially plants under stress conditions will release a variety of VOCs. Therefore, accurate measurement of plant VOCs can also provide data support for the analysis of atmospheric pollution sources, and by analyzing the VOCs released by plants, changes in plant growth status and metabolic activities can be inferred, and the presence of stress in the plant growth environment can be warned, which will help to better manage plants and prevent the occurrence of plant diseases and pests.

[0003] Therefore, collecting VOCs from plant leaves becomes a key issue. Currently, there are two main methods for collecting VOCs from plant leaves: static method and dynamic method. The static method does not exchange gas with the outside world, so the temperature will gradually rise during the sampling process and differ greatly from the external environment. The dynamic method basically uses natural light intensity, temperature and humidity, and cannot keep the plant growth environment constant, so that the VOCs test results collected from plant leaves are greatly affected by the growth environment.

[0004] Therefore, providing a dynamic collection device that can control the growth environment and accurately detect VOCs in plant leaves has become an urgent problem to be solved. Summary of the invention

[0005] In order to solve the above problems, the present invention provides a plant leaf VOCs sampling device, which is characterized by comprising a leaf chamber component, an air conditioning component, a CO2 tank, a ventilator, an air inlet pipe 1, an air outlet pipe 1, an air outlet pipe 2, a sampling pump, a humidifier and a host;

[0006] The leaf chamber assembly comprises a shell and a leaf chamber, the shell is provided with an air inlet, an air outlet and a humidification port, a lamp is installed on the inner wall of the shell, the leaf chamber is detachably connected to the shell, and the leaf chamber is located inside the shell; the air conditioning assembly is installed on the shell;

[0007] The air inlet pipe 1 is connected to the ventilator and the air inlet in sequence according to the direction of gas travel, and the air inlet of the air inlet pipe 1 is provided with a filter device 1, and the air outlet pipe 1 is connected to the air outlet, the ventilator and the host in sequence according to the direction of gas travel, and the air outlet pipe 2 is respectively connected to the air outlet pipe 1 and the sampling pump, and the air outlet pipe 2 is provided with a filter device 2 and a sampling tube in sequence according to the direction of gas travel, and the sampling pump is installed on the housing;

[0008] The CO2 tank is fixedly connected to the outer surface of the shell, and the CO2 tank is connected to the air inlet pipe one through the air inlet pipe two. A valve is installed on the air inlet pipe two. The humidifier is installed on the shell and connected to the shell.

[0009] Preferably, a base is installed inside the shell, a groove one is provided on the base, a socket is provided on the side wall of the shell, the leaf chamber is placed in the socket, and the part of the leaf chamber located in the shell is in contact and connected with the groove one.

[0010] Preferably, a control panel is also provided on the housing.

[0011] Preferably, the leaf chamber comprises an upper cover body and a lower cover body, the upper cover body is movably connected to the lower cover body, a plurality of through holes are provided on the upper cover body, and two grooves are respectively provided on the upper cover body and the lower cover body, and the positions thereof correspond.

[0012] Preferably, the air conditioning assembly includes an air conditioning indoor unit and an air conditioning outdoor unit, the air conditioning indoor unit is connected to the air conditioning outdoor unit through a pipeline, the air conditioning indoor unit is fixed on the inner wall of the shell, and the air conditioning outdoor unit is fixed on the outer surface of the shell.

[0013] Preferably, a filtering device is provided at an air inlet of the air inlet pipe.

[0014] Preferably, the filtering device is filled with one or more of activated carbon, silica gel and MnO2.

[0015] Preferably, a second filter device and a sampling tube are provided on the second air outlet pipe in sequence according to the direction of gas travel.

[0016] Preferably, the sampling tube is filled with a composite adsorbent, which is Tenax and Carbograph 5TD in a mass ratio of 1:1.

[0017] Preferably, the inner wall of the shell is made of Teflon material, and the leaf chamber is made of transparent Teflon material.

[0018] The present invention has the following advantages:

[0019] (1) The device can adjust the temperature, humidity, light and air composition in the leaf chamber according to actual conditions, and can accurately capture transient and low-concentration VOCs in plant leaves without affecting the leaves.

[0020] (2) This device can set different gradients of temperature, humidity, light, oxygen / carbon dioxide content and other parameters according to actual conditions and keep them constant to explore the release of VOCs from plant leaves under different environmental conditions. Because this device can accurately control the environment in the leaf chamber, making the experimental conditions controllable, the test results are more accurate.

[0021] (3) The device has a simple structure, convenient operation, reasonable design, low failure rate, low maintenance cost, and the loading plate is easy to install, disassemble and clean. BRIEF DESCRIPTION OF THE DRAWINGS

[0022] In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings required for use in the embodiments or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are only embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on the provided drawings without paying creative work.

[0023] Figure 1 This is a front sectional view of the device.

[0024] Figure 2 It is a three-dimensional diagram of the housing of this device.

[0025] Figure 3 This is a three-dimensional diagram of the leaf chamber of this device. DETAILED DESCRIPTION

[0026] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without making creative work are within the scope of protection of the present invention.

[0027] Example 1

[0028] Combined with Figure 1-3 , this embodiment provides a plant leaf VOCs sampling device, including a leaf chamber component 1, an air conditioning component, a CO2 tank 4, a ventilator 5, an air inlet pipe 1 21, an air outlet pipe 1 22, an air outlet pipe 2 23, a sampling pump 6, a humidifier 7 and a host 8;

[0029] The leaf chamber assembly 1 includes a shell 11 and a leaf chamber 9. The shell 11 is provided with an air inlet 1101, an air outlet 1102 and a humidification port 1103. An LED lamp 1104 is installed on the inner wall of the shell 11. A base 1105 is installed inside the shell 11. A groove 1109 is provided on the base 1105. A plug hole 1110 is provided on the side wall of the shell 11. A control panel 1112 is provided on the outer surface of the shell 11. The leaf chamber 9 includes an upper cover 901 and a lower cover 902. The upper cover 901 is movably connected to the lower cover 902 through a hinge 904. The upper cover 901 is provided with a plurality of through holes 9011. The upper cover 901 and the lower cover 902 are respectively provided with grooves 2 903, and the positions thereof correspond.

[0030] The air conditioning assembly includes an air conditioning indoor unit 1108 and an air conditioning outdoor unit 3. The air conditioning indoor unit 1108 is connected to the air conditioning outdoor unit 3 through a pipeline. The air conditioning indoor unit 1108 is fixed on the inner wall of the shell 11, and the air conditioning outdoor unit 3 is fixed on the outer surface of the shell 11.

[0031] The air inlet pipe 21 is connected to the ventilator 5 and the air inlet 1101 in sequence according to the direction of gas travel. A filter device 2101 is provided at the air inlet of the air inlet pipe 21. The air outlet pipe 22 is connected to the air outlet 1102, the ventilator 5 and the main unit 8 in sequence according to the direction of gas travel. The air outlet pipe 23 is connected to the air outlet pipe 22 and the sampling pump 6 respectively. A filter device 2301 and a sampling pipe 2302 are provided on the air outlet pipe 23 in sequence according to the direction of gas travel. The sampling pump 6 is installed on the outer surface of the shell 11.

[0032] The CO2 tank 4 is fixedly connected to the outer surface of the housing 11, and the CO2 tank 4 is connected to the air inlet pipe 1 21 through the air inlet pipe 24, and a valve 2401 is installed on the air inlet pipe 24. The humidifier 7 is installed on the outer surface of the housing 1101 and is connected to the housing 11.

[0033] The host 8 is internally provided with a temperature sensor 1105 , a humidity sensor 1106 and a CO 2 concentration sensor 1107 .

[0034] The inner wall of the shell 11 and the leaf chamber 9 are made of Teflon material, the adsorbent in the filter device 1 2101 is one or more of activated carbon, silica gel and MnO2, the sampling tube 2302 is filled with Tenax and Carbograph 5TD (mass ratio 1:1) for adsorption and fixation, and the filter device 2 2301 is made of quartz wool.

[0035] The operating principle of this device is as follows:

[0036] The plant branches are fixed on the groove 2 903 through the sealing ring 9031, and the upper cover 901 and the lower cover 902 are closed, and then the leaf chamber 9 is placed in the insertion hole 1110, and the part of the leaf chamber 9 located inside the shell 11 is placed in the groove 1 1109.

[0037] The temperature, humidity, CO2 concentration and light intensity inside the shell 11 are set through the control panel 1112, wherein the air conditioning component controls the temperature, the humidifier 7 controls the humidity, the CO2 tank 4 controls the CO2 concentration, and the LED light 1104 controls the light. The ventilator 5 is used to exchange the air between the outside and the inside of the shell 11. During this process, the air enters from the air inlet pipe 21, and VOCs and ozone in the air are removed when passing through the filter device 2101. The air inside the shell 11 flows from the outlet 1102 to the outlet pipe 22 and the outlet pipe 23 at the same time. The part flowing to the outlet pipe 22 reaches the main unit 8 through the ventilator 5, and the plant growth parameters are detected by the main unit 8. The part flowing to the outlet pipe 23 passes through the filter device 2301 and the sampling tube 2302 in turn and then reaches the sampling pump 7. When passing through the filter device 2301, the particulate matter in the gas is filtered out. When passing through the sampling tube 2302, the VOCs in the gas are adsorbed and fixed by the Tenax and Carbograph 5TD composite adsorbent (mass ratio 1:1), and the sampling is completed.

[0038] The above description of the disclosed embodiments enables those skilled in the art to implement or use the present invention. Various modifications to these embodiments will be apparent to those skilled in the art, and the general principles defined herein may be implemented in other embodiments without departing from the spirit or scope of the present invention. Therefore, the present invention will not be limited to the embodiments shown herein, but rather to the widest scope consistent with the principles and novel features disclosed herein.

Claims

1. A plant leaf VOCs sampling device, characterized in that: Including leaf chamber assembly, air conditioning assembly, CO2 tank, ventilator, air inlet pipe 1, air outlet pipe 1, air outlet pipe 2, sampling pump, humidifier and host; The leaf chamber assembly comprises a shell and a leaf chamber, the shell is provided with an air inlet, an air outlet and a humidification port, a lamp is installed on the inner wall of the shell, the leaf chamber is detachably connected to the shell, and the leaf chamber is located inside the shell; the air conditioning assembly is installed on the shell; The air inlet pipe 1 is connected to the ventilator and the air inlet in sequence according to the direction of gas travel, and the air inlet of the air inlet pipe 1 is provided with a filter device 1, and the air outlet pipe 1 is connected to the air outlet, the ventilator and the host in sequence according to the direction of gas travel, and the air outlet pipe 2 is connected to the air outlet pipe 1 and the sampling pump respectively, and the air outlet pipe 2 is provided with a filter device 2 and a sampling pipe in sequence according to the direction of gas travel, and the sampling pump is installed on the housing; The CO2 tank is fixedly connected to the outer surface of the shell, and the CO2 tank is connected to the air inlet pipe one through the air inlet pipe two. A valve is installed on the air inlet pipe two. The humidifier is installed on the shell and connected to the shell.

2. A plant leaf VOCs sampling device according to claim 1, characterized in that: A base is installed inside the shell, a groove one is arranged on the base, a plug hole is arranged on the side wall of the shell, the leaf chamber is placed in the plug hole, and the part of the leaf chamber located in the shell is in contact with the groove one.

3. A plant leaf VOCs sampling device according to claim 1, characterized in that: A control panel is also provided on the shell.

4. A plant leaf VOCs sampling device according to claim 1, characterized in that: The leaf chamber comprises an upper cover body and a lower cover body, the upper cover body is movably connected with the lower cover body, a plurality of through holes are arranged on the upper cover body, and two grooves are respectively arranged on the upper cover body and the lower cover body, and the positions thereof correspond.

5. A plant leaf VOCs sampling device according to claim 1, characterized in that: The air conditioning assembly comprises an air conditioning indoor unit and an air conditioning outdoor unit, the air conditioning indoor unit is connected to the air conditioning outdoor unit through a pipeline, the air conditioning indoor unit is fixed on the inner wall of the shell, and the air conditioning outdoor unit is fixed on the outer surface of the shell.

6. A plant leaf VOCs sampling device according to claim 1, characterized in that: A filtering device is provided at an air inlet of the air inlet pipe.

7. A plant leaf VOCs sampling device according to claim 6, characterized in that: The filtering device is filled with one or more of activated carbon, silica gel and MnO2.

8. A plant leaf VOCs sampling device according to claim 1, characterized in that: The second air outlet pipe is provided with a second filter device and a sampling pipe in sequence according to the gas travel direction.

9. A plant leaf VOCs sampling device according to claim 1, characterized in that: The sampling tube is filled with a composite adsorbent, which is Tenax and Carbograph 5TD in a mass ratio of 1:

1.

10. A plant leaf VOCs sampling device according to claim 1, characterized in that: The inner wall of the shell is made of Teflon material, and the leaf chamber is made of transparent Teflon material.

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