Gas collection device, gas analysis system and related method

Abstract

The invention provides a gas collection device, a gas analysis system and a related method, and relates to the technical field of analytical chemistry. The gas collecting device comprises a central controller, a gas inlet pipe, a collecting device, and a sampling pump, a heating device and a temperature detector which are respectively in communication connection with the central controller, the sampling pump, the collecting device and the gas inlet pipe are sequentially communicated, the temperature detector is arranged on the inner wall of the gas inlet pipe, and the heating device is in contact with the outer wall of the gas inlet pipe; wherein after the sampling pump is started, external target gas containing volatile organic compounds can be sucked into the gas inlet pipe, the gas inlet pipe can convey the target gas to the collecting device for storage, and the temperature detector can detect temperature data in the gas inlet pipe in real time; the central controller can control the heating device to heat the air inlet pipe when the temperature data are not within the preset temperature range, so that the temperature data are within the preset temperature range. On the basis, volatile organic compounds can be prevented from remaining in the air inlet pipe, and cross contamination is avoided.

Description

Technical Field

[0001] The present application relates to the technical field of analytical chemistry, and in particular to a gas collection device, a gas analysis system and related methods. Background Art

[0002] Volatile Organic Compounds (VOCs) refer to organic compounds that are easily volatile at room temperature. They have low boiling point, small molecular weight and high saturated vapor pressure (greater than 13.33Pa) under standard conditions. For example, the metabolites of humans or other organisms contain volatile organic compounds, which may include but are not limited to urine, feces, body fluids and exhaled gases. The analysis of volatile organic compounds is critical and helps in disease diagnosis, disease monitoring and health assessment. Usually, when analyzing volatile organic compounds, what is actually analyzed is the target gas containing volatile organic compounds. If the metabolites of humans or other organisms are exhaled gases, they can be directly used as target gases. If the metabolites of humans or other organisms are urine, feces and body fluids, etc., then the urine, feces and body fluids need to be placed in a headspace bottle (i.e., a headspace injector), and then the headspace gas in the headspace bottle is drawn out, and the headspace gas is used as the target gas.

[0003] In the related art, the process of analyzing the target gas containing volatile organic compounds is: using a gas collector to collect the target gas; transporting the target gas in the gas collector to a gas analyzer; and using the gas analyzer to analyze the target gas. However, when using a gas collector to collect the target gas, volatile organic compounds are easily left in the gas collector, which leads to cross contamination, which not only affects the collection of the target gas by the gas collector, but also reduces the accuracy of the subsequent analysis of the target gas by the gas analyzer. Summary of the invention

[0004] The present application provides a gas collection device, a gas analysis system and related methods, aiming to solve the problem of insufficient accuracy in analyzing gases containing volatile organic compounds in the related art.

[0005] In order to solve the above-mentioned drawbacks existing in the related technology, the first aspect of the present application provides a gas collection device, which is used to collect target gas containing volatile organic compounds. The gas collection device includes a rack, a central controller, an air intake pipe, a collecting device, and a sampling pump, a heating device and a temperature detector which are respectively communicatively connected to the central controller. The central controller, the sampling pump, the collecting device and the heating device are all arranged on the rack, the sampling pump, the collecting device and the air intake pipe are connected in sequence, the heating device is in contact with the outer wall of the air intake pipe, and the temperature detector is arranged on the inner wall of the air intake pipe. Specifically, the sampling pump is used to form a negative pressure at the pipe mouth of the intake pipe away from the collecting device, so as to suck the external target gas into the intake pipe; the intake pipe is used to transport the target gas to the collecting device; the collecting device is used to store the target gas; the heating device is used to heat the intake pipe; the temperature detector is used to detect the temperature data in the intake pipe in real time; the central controller is used to determine whether the temperature data is within a preset temperature range, and when it is not within the preset temperature range, control the heating device to adjust the heating amount of the intake pipe so that the temperature data is within the preset temperature range to avoid volatile organic matter remaining in the intake pipe.

[0006] In some implementations, the heating device includes a heating sleeve and a power supply, the power supply is communicatively connected to the central controller, the heating sleeve is arranged on the outer wall of the intake pipe, the power supply is arranged on the frame and electrically connected to the heating sleeve; wherein the power supply is used to transmit a heating current to the heating sleeve to heat the heating sleeve; the heating sleeve is used to heat the intake pipe by the heat emitted by itself; the central controller is specifically used to control the power supply to adjust the size of the heating current when the temperature data is not within the preset temperature range, so as to adjust the heating amount of the heating sleeve heating the intake pipe so that the temperature data is within the preset temperature range. In one of the implementations, the heating sleeve includes a heating element, a terminal, an insulating layer, and an inner layer and an outer layer relative to each other, the inner layer is used to contact the outer wall of the intake pipe, the insulating layer is arranged between the inner layer and the outer layer, the heating element is arranged between the insulating layer and the inner layer, the terminal is arranged on the outer layer, and the heating element is electrically connected to the power supply through the terminal; wherein the terminal is used to transmit the heating current provided by the power supply to the heating element to heat the heating element; the heating element is used to heat the intake pipe by the heat emitted by itself.

[0007] In some implementation schemes, the heating device includes a water storage jacket and a circulating water heating component, the water storage jacket is arranged on the outer wall of the intake pipe, the circulating water heating component is arranged on the frame and connected to the water storage jacket, and the circulating water heating component is communicatively connected to the central controller; wherein, the circulating water heating component is used to cyclically transport heating water to the water storage jacket and recover the heating water in the water storage jacket to heat the water storage jacket; the water storage jacket is used to heat the intake pipe by the heat dissipated by itself; the central controller is specifically used to control the circulating water heating component to adjust the temperature of the heating water when the temperature data is not within the preset temperature range, so as to adjust the heating amount of the intake pipe by the water storage jacket, so that the temperature data is within the preset temperature range.

[0008] In one of the implementation schemes, the circulating water heating component includes a heater, a water tank, a circulating water pump, a water inlet pipe and a return water pipe. The heater, the water tank and the circulating water pump are all arranged on a frame, the heater is in contact with the outer wall of the water tank, one end of the water inlet pipe is arranged in the water storage jacket, and the other end is connected to the water tank through the circulating water pump, one end of the return water pipe is arranged in the water storage jacket, and the other end is connected to the water tank through the circulating water pump, and the heater and the circulating water pump are respectively communicatively connected to the central controller; wherein the heater is used to heat the heating water stored in the water tank; the circulating water pump is used to cyclically transport the heating water in the water tank to the water storage jacket through the water inlet pipe, and to recover the heating water in the water storage jacket to the water tank through the return water pipe, so as to heat the water storage jacket; the central controller is specifically used to control the heater to adjust the heating amount of the heating water when the temperature data is not within the preset temperature range, so as to adjust the heating amount of the water storage jacket to heat the air inlet pipe, so that the temperature data is within the preset temperature range.

[0009] In some implementations, the target gas is located in the breathing mask or the head space sampler when it is not inhaled into the air intake pipe, and the gas collection device further includes a first dehydration device, which is arranged on the frame, and the air intake pipe is used to communicate with the breathing mask or the head space sampler through the first dehydration device. Based on this, the first dehydration device is used to remove water vapor in the target gas when the target gas in the breathing mask or the head space sampler is inhaled into the air intake pipe.

[0010] In some implementation schemes, the gas collection device also includes a flow detector that is communicatively connected to the central controller, the flow detector is arranged on the rack, and the flow detector is connected between the sampling pump and the collection device; wherein the flow detector is used to detect the gas flow flowing through the collection device in real time; the central controller is also used to determine whether the gas flow is within a preset gas flow range, and when it is not within the preset gas flow range, adjust the gas flow by controlling the sampling pump so that the gas flow is within the preset gas flow range.

[0011] In one of the implementation schemes, the gas collection device also includes a second dehydration device disposed on the frame, and the second dehydration device is connected between the flow detector and the collection device to block water vapor outside the flow detector.

[0012] In one of the implementation schemes, the gas collection device also includes a flow regulating device that is communicatively connected to the central controller, the flow regulating device is arranged on the rack, and the flow regulating device is connected between the sampling pump and the flow detector; wherein the flow regulating device is used to regulate the gas flow; the central controller is specifically used to adjust the gas flow by controlling the sampling pump and / or the flow regulating device when the gas flow is not within the preset gas flow range, so that the gas flow is within the preset gas flow range. Further, the gas collection device also includes a buffer device arranged on the rack, the buffer device is connected between the sampling pump and the flow regulating device, and is used to stabilize the gas flow. Specifically, the buffer device includes a hollow buffer block, the buffer block has two openings that are connected to the inside and opposite to each other, one opening is used to connect the flow regulating device and the buffer block, and the other opening is used to connect the sampling pump and the buffer block, and the buffer block is filled with a buffer material.

[0013] In some implementations, the gas collection device also includes an audible and visual alarm that is communicatively connected to the central controller and is disposed on the rack. Based on this, the central controller is also used to: when the gas flow exceeds the upper limit of the preset gas flow range, determine whether the difference between the gas flow and the upper limit is greater than a first preset threshold value, and if it is greater than the first preset threshold value, control the audible and visual alarm to sound and light alarm; or, when the gas flow is lower than the lower limit of the preset gas flow range, determine whether the difference between the lower limit and the gas flow is greater than a second preset threshold value, and if it is greater than the second preset threshold value, control the audible and visual alarm to sound and light alarm.

[0014] In some implementations, the collection device includes a bypass pipe, two electric three-way valves and at least one collection pipe, wherein two opposite pipe openings of the collection pipe are respectively connected to the sampling pump and the air intake pipe through two electric three-way valves, and two opposite pipe openings of the bypass pipe are respectively connected to the sampling pump and the air intake pipe through two electric three-way valves, and the two electric three-way valves are respectively connected to the central controller for communication. The sampling pump is also used to suck the external clean gas into the gas collection device through the air intake pipe when cleaning the gas circuit of the gas collection device. The central controller is also used to: when collecting the target gas, control the two electric three-way valves to cut off the bypass pipe and connect the collection pipe so as to collect the target gas using the collection pipe; or, when cleaning the gas circuit of the gas collection device, control the two electric three-way valves to simultaneously connect the bypass pipe and the collection pipe so as to maintain the fluidity of the clean gas in the gas collection device.

[0015] In some implementation schemes, the gas collection device also includes a touch screen and a control box with a hollow interior. The control box is arranged on the frame, the touch screen is embedded in the outer wall of the control box, the central controller is arranged in the control box, and the touch screen is communicatively connected to the central controller.

[0016] In some implementation schemes, the gas collection device also includes a storage module and a communication module that are respectively communicatively connected to the central controller, and the storage module and the communication module are both arranged in the control box, and the communication module is used to communicate with the external device; wherein, the storage module is used to store data sent, received and / or processed by the central controller; the communication module is used to establish a communication connection relationship between the central controller and the external device, and thereby realize data interaction between the central controller and the external device.

[0017] In some implementation schemes, the gas collection device also includes a battery and a charging management module disposed in a control box, the charging management module is communicatively connected to the central controller, the central controller is electrically connected to the battery, the battery is electrically connected to the charging management module, and the charging management module is used to electrically connect to an external power supply.

[0018] The second aspect of the present application provides a gas analysis system, comprising a gas analysis device and the gas collection device mentioned in the first aspect of the present application; wherein the gas collection device is used to collect target gas containing volatile organic matter; the gas analysis device is connected to the gas collection device, and is used to obtain the target gas in the gas collection device and analyze the target gas.

[0019] The third aspect of the present application provides a gas collection method, which is applied to the central controller in the gas collection device mentioned in the first aspect of the present application. The gas collection method includes: obtaining temperature data in the intake pipe; judging whether the temperature data is within a preset temperature range, and when it is not within the preset temperature range, controlling the heating device to adjust the heating amount of the intake pipe so that the temperature data is within the preset temperature range; controlling the sampling pump to start, so as to form a negative pressure at the pipe mouth of the intake pipe away from the collection device through the sampling pump, so that the target gas containing volatile organic compounds outside is sucked into the intake pipe and transported to the collection device through the intake pipe for storage.

[0020] The gas collection device provided in the first aspect of the present application includes a central controller, an air intake pipe and a collecting device, as well as a sampling pump, a heating device and a temperature detector which are respectively communicatively connected to the central controller, the sampling pump, the collecting device and the air intake pipe are connected in sequence, the temperature detector is arranged on the inner wall of the air intake pipe, and the heating device is in contact with the outer wall of the air intake pipe; wherein, after the sampling pump is started, the target gas containing volatile organic matter from the outside can be sucked into the air intake pipe, the air intake pipe can transport the target gas to the collecting device for storage, and the temperature detector can detect the temperature data in the air intake pipe in real time, and the central controller can control the heating device to adjust the heating amount of the air intake pipe when the temperature data is not within the preset temperature range, so that the temperature data is within the preset temperature range. It is understandable that the temperature of the target gas is usually higher than the ambient temperature. Then in the traditional solution, when the target gas encounters the intake pipe with a lower temperature, the volatile organic compounds in the target gas will easily remain in the intake pipe, especially the volatile organic compounds with high boiling points, which leads to cross contamination. In this regard, the present application will use a heating device to regulate the temperature in the intake pipe so that the temperature in the intake pipe is always within a preset temperature range, such as maintaining the temperature in the intake pipe at 37°C or above. In this case, the temperature in the intake pipe will be higher than or equal to the temperature of the target gas, which can greatly reduce the residue of volatile organic compounds in the intake pipe and avoid cross contamination. It can not only ensure the collection effect of the gas collection device on the target gas, but also improve the accuracy of the subsequent gas analysis device in analyzing the target gas.

[0021] For the gas analysis system provided in the second aspect of the present application, since the gas analysis system includes the gas collection device provided in the first aspect of the present application, the gas analysis system has all the advantages of the gas collection device provided in the first aspect of the present application.

[0022] The gas collection method provided in the third aspect of the present application is applied in the gas collection device provided in the first aspect of the present application, that is, it is implemented based on the gas collection device provided in the first aspect of the present application, so it has all the advantages of the gas collection device provided in the first aspect of the present application. BRIEF DESCRIPTION OF THE DRAWINGS

[0023] In order to more clearly illustrate the technical solutions in the related technologies or the embodiments of the present application, the drawings required for use in the description of the related technologies or the embodiments of the present application will be briefly introduced below. Obviously, the drawings in the following description are only some embodiments of the present application, not all embodiments. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative work.

[0024] Figure 1 A module block diagram of a gas collection device provided in an embodiment of the present application;

[0025] Figure 2 Another module block diagram of the gas collection device provided in an embodiment of the present application;

[0026] Figure 3 Two schematic diagrams of the structures of the collecting device provided in the embodiments of the present application;

[0027] Figure 4 A module block diagram of a gas analysis system provided in an embodiment of the present application;

[0028] Figure 5 A schematic diagram of the flow chart of the gas collection method provided in an embodiment of the present application.

[0029] The symbols in the above drawings represent:

[0030] 100-gas collection device, 101-central controller, 102-sampling pump, 103-collecting device, 104-intake pipe, 105-temperature detector, 106-heating device, 107-first water removal device, 108-flow detector, 109-second water removal device, 110-flow regulating device, 111-buffer device, 112-touch screen, 113-storage module, 114-communication module, 115-battery, 116-charging management module, 1031-bypass pipe, 1032-collecting pipe, 1033-electric three-way valve, 200-gas analysis device. DETAILED DESCRIPTION

[0031] In the related art, the process of analyzing the target gas containing volatile organic compounds is: using a gas collector to collect the target gas; transporting the target gas in the gas collector to a gas analyzer; and using the gas analyzer to analyze the target gas. However, when using a gas collector to collect the target gas, volatile organic compounds are easily left in the gas collector, which leads to cross contamination. This not only affects the collection of the target gas by the gas collector, but also reduces the accuracy of the subsequent analysis of the target gas by the gas analyzer, ultimately causing deviations in the analysis results of the gas analyzer. In view of this, the present application proposes a gas collection device, a gas analysis system and related methods in the embodiments below to solve the above-mentioned drawbacks in the related art.

[0032] In order to make the purpose, technical solutions and advantages of the present application more obvious and easy to understand, the present application will be clearly and completely described below in conjunction with the embodiments of the present application and the corresponding drawings, wherein the same or similar reference numerals throughout represent the same or similar elements or elements with the same or similar functions. It should be understood that the embodiments of the present application described below are only used to explain the present application and are not used to limit the present application, that is, based on the embodiments of the present application, all other embodiments obtained by ordinary technicians in this field without making creative work belong to the scope of protection of the present application. In addition, the technical features involved in the various embodiments of the present application described below can be combined with each other as long as they do not conflict with each other.

[0033] See also Figure 1 , Figure 1 This is a module block diagram of a gas collection device. This embodiment provides a gas collection device 100, which is used to collect target gas containing volatile organic compounds, including a rack (not shown), a central controller 101, an air intake pipe 104, a collection device 103, and a sampling pump 102, a heating device 106, and a temperature detector 105 respectively connected to the central controller 101 for communication. The central controller 101, the sampling pump 102, the collection device 103, and the heating device 106 are all arranged on the rack, the sampling pump 102, the collection device 103, and the air intake pipe 104 are connected in sequence, the heating device 106 is in contact with the outer wall of the air intake pipe 104, and the temperature detector 105 is arranged on the inner wall of the air intake pipe 104. Among them, the temperature detector 105 can adopt any device with temperature detection function commonly used in the field, such as thermocouples, temperature-sensitive diodes, temperature-sensitive transistors, temperature sensor chips, RTDs (resistance temperature detectors) and NTCs (negative temperature coefficient thermistors), etc. The specific selection can be based on actual needs, and this application does not make a sole limitation on this.

[0034] Specifically, the sampling pump 102 is used to form a negative pressure at the pipe mouth of the intake pipe 104 away from the collecting device 103, so as to suck the external target gas into the intake pipe 104; the intake pipe 104 is used to transport the target gas to the collecting device 103; the collecting device 103 is used to store the target gas; the heating device 106 is used to heat the intake pipe 104; the temperature detector 105 is used to detect the temperature data in the intake pipe 104 in real time; the central controller 101 is used to determine whether the temperature data is within a preset temperature range, and when it is not within the preset temperature range, control the heating device 106 to adjust the heating amount of the intake pipe 104, so that the temperature data is within the preset temperature range to avoid volatile organic matter remaining in the intake pipe 104.

[0035] In this embodiment, the target gas is located in the breathing mask or the head space sampler when it is not inhaled into the air inlet pipe 104, that is, the air inlet pipe 104 is connected to the breathing mask or the head space sampler; wherein, if the metabolic substance of humans or other organisms is exhaled gas, then the air inlet pipe 104 can be connected to the breathing mask, and at this time, the gas exhaled by humans or other organisms in the breathing mask is the target gas; if the metabolic substance of humans or other organisms is urine, feces, body fluids, etc., then the air inlet pipe 104 can be connected to the head space sampler, and at this time, the head space gas located above urine, feces, body fluids, etc. in the head space sampler is the target gas. Preferably, an end of the air inlet pipe 104 away from the collecting device 103 is provided with an air inlet interface (not shown) connected to itself, and the air inlet pipe 104 is connected to a breathing mask or a head space sampler through the air inlet interface; of course, what is connected to the air inlet pipe 104 is not limited to a breathing mask or a head space sampler, but can also be other containers containing target gas, such as an air bag, etc., and the present application does not make a sole limitation on this.

[0036] In this embodiment, the volatile organic compounds in the target gas may include, but are not limited to: aromatic hydrocarbons, such as benzene, toluene, xylene, styrene, etc.; aliphatic hydrocarbons; halogenated hydrocarbons, such as trichloroethylene, chloroform, trichloroethane, etc.; alcohols, such as ethanol, etc.; aldehydes, such as formaldehyde, etc.; ketones; polyol compounds; ethers, phenols, epoxy compounds; esters, acid compounds; amines, nitrile compounds; methyl bromide, chlorofluorocarbon compounds. All of the compounds listed in this paragraph are volatile, and they are easy to evaporate and enter the atmosphere under certain conditions, but some of these compounds are also chemically reactive and toxic, which will affect the environment and human health. In view of this, a filtering device (not shown) can be set up and connected to the sampling pump 102. Then, during the collection of the target gas, the filtering device can filter the exhaust gas discharged by the sampling pump 102 to prevent the direct discharge of these exhaust gases and affect the environment and human health; wherein, the filtering device can be implemented based on activated carbon adsorption, condensation, membrane separation and other technologies, and this application does not make a sole limitation on this.

[0037] That is to say, the process of the gas collection device 100 collecting the target gas is: the temperature detector 105 detects the temperature data in the intake pipe 104 in real time and transmits it to the central controller 101; the central controller 101 determines whether the temperature data is within the preset temperature range, and when it is not within the preset temperature range, controls the heating device 106 to adjust the heating amount of the intake pipe 104 so that the temperature data is within the preset temperature range; the central controller 101 controls the sampling pump 102 to start, so as to form a negative pressure at the pipe mouth of the intake pipe 104 away from the collecting device 103 through the sampling pump 102, so that the target gas containing volatile organic compounds outside (i.e., in the breathing mask or head space sampler) is sucked into the intake pipe 104; the intake pipe 104 transports the target gas to the collecting device 103; the collecting device 103 stores the target gas, thereby preparing for the subsequent analysis of the target gas. In addition, it should be noted that although this paragraph describes the use of the heating device 106 to control the temperature of the intake pipe 104 before the target gas is sucked into the intake pipe 104, the heating device 106 can actually also be used to control the temperature of the intake pipe 104 during the process of the target gas being sucked into the intake pipe 104. The specific setting can be based on actual needs, and this application does not make a sole limitation on this.

[0038] It is understandable that the temperature of the target gas is usually higher than the ambient temperature. In the traditional solution, when the target gas encounters the lower temperature of the intake pipe 104, the volatile organic matter in the target gas is easy to remain in the intake pipe 104, especially the high boiling point volatile organic matter, which leads to cross contamination. In this regard, the present embodiment uses the heating device 106 to regulate the temperature in the intake pipe 104, so that the temperature in the intake pipe 104 is always within the preset temperature range, such as maintaining the temperature in the intake pipe 104 at 37°C or above. In this case, the temperature in the intake pipe 104 will be higher than or equal to the temperature of the target gas, which can greatly reduce the volatile organic matter remaining in the intake pipe 104, avoid cross contamination, and not only ensure the collection effect of the gas collection device 100 on the target gas, but also improve the accuracy of the subsequent analysis of the target gas. In addition, the use of the heating device 106 to regulate the temperature in the intake pipe 104 can also effectively prevent water vapor from condensing in the intake pipe 104, which can further avoid the occurrence of cross contamination.

[0039] In some embodiments, the heating device 106 includes a heating sleeve (not shown) and a power supply (not shown) that is communicatively connected to the central controller 101. The heating sleeve is mounted on the outer wall of the air inlet pipe 104. The power supply is mounted on the frame and electrically connected to the heating sleeve. Based on this, the power supply is used to transmit a heating current to the heating sleeve to heat the heating sleeve; the heating sleeve is used to heat the air inlet pipe 104 by the heat emitted by itself; the central controller 101 is specifically used to control the power supply to adjust the size of the heating current when the temperature data is not within the preset temperature range, so as to adjust the heating amount of the heating sleeve to heat the air inlet pipe 104, so that the temperature data is within the preset temperature range. That is to say, the heating sleeve is placed on the outer wall of the air intake pipe 104, and a heating current is transmitted to the heating sleeve through a power supply to heat the heating sleeve, and then the air intake pipe 104 is heated by the heat emitted by the heating sleeve, and the central controller 101 can adjust the size of the heating current at any time by controlling the power supply, that is, the heating amount of the air intake pipe 104 heated by the heating sleeve can be controlled by the central controller 101 at any time, ultimately achieving the purpose of the temperature in the air intake pipe 104 always being within a preset temperature range.

[0040] As one embodiment, the heating sleeve includes a heating element (not shown), a terminal (not shown), an insulating layer (not shown), and a relative inner layer (not shown) and an outer layer (not shown), wherein the inner layer is used to contact the outer wall of the air intake pipe 104, the insulating layer is arranged between the inner layer and the outer layer, the heating element is arranged between the insulating layer and the inner layer, the terminal is arranged on the outer layer, and the heating element is electrically connected to the power supply through the terminal. Based on this, the terminal is used to transmit the heating current provided by the power supply to the heating element to heat the heating element; the heating element is used to heat the air intake pipe 104 through the heat emitted by itself. That is to say, in this embodiment, the heating current is transmitted to the heating element by the power supply to heat the heating element, and then the air intake pipe 104 is heated by the heat emitted by the heating element, and the insulating layer is arranged between the heating element and the outer layer, which can effectively prevent heat loss and avoid leakage.

[0041] It should be noted that the heating element can be any device with heating function commonly used in the art, such as resistance wire, heating tube, etc.; the material of the insulating layer can be any material with insulation performance commonly used in the art, such as asbestos, ceramic fiber, etc.; the heating element and the terminal are not limited to one, and multiple heating elements can also be set. The more heating elements, the better the heating effect of the heating sleeve on the intake pipe 104. The material of the insulating layer, the selection of the heating element, and the number of the heating elements and the terminal mentioned in this paragraph can be set according to actual needs, and this application does not make a sole limitation on this.

[0042] In some embodiments, the heating device 106 includes a water storage jacket (not shown) and a circulating water heating component (not shown), the water storage jacket is mounted on the outer wall of the air inlet pipe 104, the circulating water heating component is mounted on the frame and connected to the water storage jacket, and the circulating water heating component is communicatively connected to the central controller 101. Based on this, the circulating water heating component is used to cyclically transport heating water to the water storage jacket and to recover the heating water in the water storage jacket to heat the water storage jacket; the water storage jacket is used to heat the air inlet pipe 104 by the heat emitted by itself; the central controller 101 is specifically used to control the circulating water heating component to adjust the temperature of the heating water when the temperature data is not within the preset temperature range, so as to adjust the heating amount of the water storage jacket heating the air inlet pipe 104, so that the temperature data is within the preset temperature range. That is to say, the water storage jacket is arranged on the outer wall of the air inlet pipe 104, and the heating water is cyclically transported into the water storage jacket and the heating water in the water storage jacket is recovered through the circulating water heating component to heat the water storage jacket, and then the air inlet pipe 104 is heated by the heat dissipated by the water storage jacket, and the central controller 101 can adjust the temperature of the heating water at any time by controlling the circulating water heating component, that is, the heating amount of the water storage jacket for heating the air inlet pipe 104 can be controlled by the central controller 101 at any time, and finally the purpose of the temperature in the air inlet pipe 104 is always within the preset temperature range is achieved.

[0043] As one embodiment, the circulating water heating component includes a heater (not shown), a water tank (not shown), a circulating water pump (not shown), a water inlet pipe (not shown) and a return water pipe (not shown). The heater, the water tank and the circulating water pump are all arranged on a frame, the heater is in contact with the outer wall of the water tank, one end of the water inlet pipe is arranged in a water storage jacket, and the other end is connected to the water tank through the circulating water pump, one end of the return water pipe is arranged in a water storage jacket, and the other end is connected to the water tank through the circulating water pump, and the heater and the circulating water pump are respectively communicated with the central controller 101. Based on this, the heater is used to heat the heating water stored in the water tank; the circulating water pump is used to cyclically transport the heating water in the water tank to the water storage jacket through the water inlet pipe, and to recover the heating water in the water storage jacket to the water tank through the return pipe to heat the water storage jacket; the central controller 101 is specifically used to control the heater to adjust the heating amount of the heating water when the temperature data is not within the preset temperature range, so as to adjust the heating amount of the water storage jacket to the air intake pipe 104, so that the temperature data is within the preset temperature range. It can be understood that compared with the electric heating method using power supply and heating jacket described above, this embodiment uses a circulating water heating method to heat the air intake pipe 104, which has excellent characteristics such as high energy utilization, uniform and stable heating, small load on the power grid, low cost, wide application range, good durability, and high safety.

[0044] Of course, in addition to the electric heating method using a power supply and a heating sleeve described above and the circulating water heating method of this embodiment, in other embodiments, other heating methods commonly used in the art may be used, such as infrared heating, electromagnetic induction heating, etc., or even a combination of multiple different heating methods. The specific heating method or methods may be selected based on actual needs, and this application does not make a sole limitation on this. For example, if electromagnetic induction heating is used, one or more layers of coils may be wound around the outer wall of the air intake pipe 104. When alternating current is passed through the coil, the coil will heat up, thereby achieving heating of the air intake pipe 104.

[0045] In some embodiments, see Figure 2 , Figure 2 Another module block diagram of a gas collection device is shown. In addition to the structure given above, the gas collection device 100 also includes a first dehydration device 107 arranged on the frame, and the air inlet pipe 104 can be connected to the breathing mask or the head space sampler through the first dehydration device 107. Specifically, the first dehydration device 107 is used to remove water vapor in the target gas during the process of the target gas in the breathing mask or the head space sampler being sucked into the air inlet pipe 104. In other words, the first dehydration device 107 is connected between the air inlet pipe 104 and the breathing mask or the head space sampler, and the first dehydration device 107 is used to filter out water vapor in the target gas that is about to enter the air inlet pipe 104, so that water vapor can be effectively prevented from entering the collection device 103 through the air inlet pipe 104, thereby ensuring the collection effect of the collection device 103 on the target gas, and then improving the accuracy of the subsequent analysis of the target gas in the collection device 103. It should be noted that the first water removal device 107 can be any device commonly used in the art that has a water vapor removal function, such as a wire mesh demister, a steam-water separator, a membrane separator, a Nafion TM The dewatering device and the low-temperature dewatering device, etc., can even be a combination of a variety of different dewatering devices, which can be selected according to actual needs, and this application does not make the sole limitation to this.

[0046] In some embodiments, see Figure 2In addition to the structure given above, the gas collection device 100 also includes a flow detector 108. The flow detector 108 is arranged on the rack, and the flow detector 108 is communicatively connected to the central controller 101. The flow detector 108 is connected between the sampling pump 102 and the collection device 103. Specifically, the flow detector 108 is used to detect the gas flow flowing through the collection device 103 in real time; the central controller 101 is also used to determine whether the gas flow is within the preset gas flow range, and when it is not within the preset gas flow range, the gas flow is adjusted by controlling the sampling pump 102 so that the gas flow is within the preset gas flow range. It should be noted that the flow detector 108 can adopt any device with a gas flow detection function commonly used in the art, such as an orifice flowmeter, a turbine flowmeter, a vortex flowmeter, a thermal mass flowmeter, and an ultrasonic flowmeter, etc., which can be selected according to actual needs, and this application does not make a sole limitation on this.

[0047] That is to say, in the process of collecting the target gas, the flow detector 108 can detect the gas flow flowing through the collection device 103 in real time, and transmit the detected gas flow to the central controller 101, and the central controller 101 can compare the gas flow with the preset gas flow range. When the gas flow is not within the preset gas flow range, the central controller 101 can adjust the gas flow by controlling the sampling pump 102, such as controlling the sampling pump 102 to adjust its own operating parameters such as speed, power and inlet and outlet pressure difference, so that the gas flow is finally within the preset gas flow range. It is understandable that in different collection processes of the target gas, there may be different requirements for the gas flow, so the relevant personnel can set the preset gas flow range according to the requirements for the gas flow, so that in the process of collecting the target gas, through the coordination between the central controller 101, the sampling pump 102 and the flow detector 108, the gas flow can be accurately controlled within the preset gas flow range.

[0048] As one of the embodiments, the gas collection device 100 further includes a second dehydration device 109, which is disposed on the frame and connected between the flow detector 108 and the collection device 103. Specifically, the second dehydration device 109 is used to block water vapor outside the flow detector 108. That is to say, the second dehydration device 109 is the same as the first dehydration device 107 described above, and both of them function to filter out water vapor in the gas. By connecting the second dehydration device 109 between the flow detector 108 and the collection device 103, water vapor can be effectively prevented from entering the flow detector 108, thereby ensuring the accuracy of the flow detector 108 in detecting the gas flow, which is beneficial to the precise control of the gas flow by the gas collection device 100.

[0049] As one embodiment, the gas collection device 100 also includes a flow regulating device 110 that is communicatively connected to the central controller 101. The flow regulating device 110 is arranged on the rack, and the flow regulating device 110 is connected between the sampling pump 102 and the flow detector 108, and is used to regulate the gas flow flowing through the collection device 103. Based on this, the central controller 101 is specifically used to determine whether the gas flow is within the preset gas flow range, and when it is not within the preset gas flow range, the gas flow is adjusted by controlling the sampling pump 102 and / or the flow regulating device 110, so that the gas flow is within the preset gas flow range. It should be noted that the flow regulating device 110 can adopt any device with a gas flow regulating function commonly used in the art, such as a regulating valve, a throttle valve, a needle valve, a proportional valve, and a flow controller, etc., which can be selected according to actual needs, and this application does not make a sole limitation on this.

[0050] That is to say, when the central controller 101 determines that the gas flow rate is not within the preset gas flow rate range, the gas flow rate can be adjusted not only by adjusting the operating parameters of the sampling pump 102 such as the rotation speed, power and inlet and outlet pressure difference, but also by the flow regulating device 110 connected between the sampling pump 102 and the flow detector 108. This makes the adjustable range of the gas flow rate wider, and the gas collection device 100 can also collect the target gas within a wider gas flow rate range. In short, by controlling the sampling pump 102 and / or the flow regulating device 110, different gas flow rates can be achieved, which is convenient for meeting different gas flow rate requirements; moreover, by controlling the sampling pump 102 and / or the flow regulating device 110, accurate adjustment of the gas flow rate can also be achieved, which can effectively prevent the difference in the collection amount of the target gas caused by the difference in the gas resistance of the collection device 103. It should be noted that although the sampling pump 102 and the flow regulating device 110 are automatically controlled by the central controller 101 in the present embodiment, in other embodiments, the sampling pump 102 and the flow regulating device 110 may also be manually controlled. As for whether it is manual control or automatic control, it can be selected according to actual needs, and this application does not make a sole limitation on this.

[0051] As one embodiment, the gas collection device 100 also includes an audible and visual alarm (not shown) that is communicatively connected to the central controller 101, and the audible and visual alarm is arranged on the rack. Based on this, the central controller 101 is also used to: when the gas flow exceeds the upper limit of the preset gas flow range, determine whether the difference between the gas flow and the upper limit is greater than the first preset threshold value, if this difference is greater than the first preset threshold value, then control the audible and visual alarm to make an audible and visual alarm; or, when the gas flow is lower than the lower limit of the preset gas flow range, determine whether the difference between the lower limit and the gas flow is greater than the second preset threshold value, if this difference is greater than the second preset threshold value, then control the audible and visual alarm to make an audible and visual alarm. In addition, it should be noted that the first preset threshold value and the second preset threshold value can be the same or different, and can be set according to actual needs, and this application does not make a sole limitation on this.

[0052] It is understandable that during the collection process of the target gas, if the gas flow rate is not within the preset gas flow rate range and is far away from the preset gas flow rate range, it means that there is an abnormality in the gas collection device 100. Since the gas collection device 100 is easily damaged when working under abnormal conditions, when the gas collection device 100 is abnormal, this embodiment will use an audible and visual alarm to sound and light alarm, thereby reminding relevant personnel through audible and visual alarm. In this embodiment, if the central controller 101 determines that the gas flow rate exceeds the upper limit value of the preset gas flow rate range, and the difference between the gas flow rate and the upper limit value is large (i.e., greater than the first preset threshold value), then it means that the gas flow rate is too large, and it is very likely that the collection device 103 has a gas leak. At this time, the central controller 101 will control the sound and light alarm to sound and light alarm, thereby reminding relevant personnel; if the central controller 101 determines that the gas flow rate is lower than the lower limit value of the preset gas flow rate range, and the difference between the lower limit value and the gas flow rate is large (i.e., greater than the second preset threshold value), then it means that the gas flow rate is too small, and it is very likely that the gas path of the gas collection device 100 is blocked. At this time, the central controller 101 will also control the sound and light alarm to sound and light alarm to remind relevant personnel.

[0053] As one of the embodiments, the gas collection device 100 also includes a buffer device 111 disposed on the frame, and the buffer device 111 is connected between the sampling pump 102 and the flow regulating device 110. The buffer device 111 mainly buffers the gas flow in the gas path of the gas collection device 100 to stabilize the gas flow flowing through the collection device 103, that is, to prevent excessive fluctuations in the gas flow. Especially in the large flow collection scenario of the target gas, the ability of the buffer device 111 to stabilize the gas flow can effectively avoid VOCs penetration of the collection device 103 caused by excessive fluctuations in the gas flow. In some implementations of this embodiment, the buffer device 111 includes a hollow buffer block (not shown in the figure), and the buffer block has two openings that are connected to and opposite to the inside (not shown in the figure), one opening is used to connect the sampling pump 102 and the buffer block, and the other opening is used to connect the flow regulating device 110 and the buffer block, and the buffer block is filled with a buffer material (not shown in the figure). It should be noted that the buffer material can be any material commonly used in the art that has a buffering effect on gas flow, such as buffer cotton, buffer film, foam iron nickel, foam copper and gas spring, etc. The specific material can be selected according to actual needs, and this application does not make a sole limitation on this.

[0054] In some embodiments, see Figure 3 , Figure 3 The following are two schematic diagrams of the collection device. Figure 3 (a) corresponds to the case of one collecting tube. Figure 3 (b) corresponds to the case of multiple collection pipes. The collection device 103 includes a bypass pipe 1031, two electric three-way valves 1033 and at least one collection pipe 1032. The two opposite pipe openings of the collection pipe 1032 are respectively connected to the sampling pump 102 and the air intake pipe 104 through the two electric three-way valves 1033. The two opposite pipe openings of the bypass pipe 1031 are respectively connected to the sampling pump 102 and the air intake pipe 104 through the two electric three-way valves 1033. The two electric three-way valves 1033 are respectively connected to the central controller 101 for communication. Specifically, the sampling pump 102 is also used to suck the external clean gas into the gas collection device 100 through the air intake pipe 104 when cleaning the gas path of the gas collection device 100. The central controller 101 is also used to: when collecting the target gas, control the two electric three-way valves 1033 to cut off the bypass pipe 1031 and connect the collection pipe 1032, so as to use the collection pipe 1032 to collect the target gas; or, when cleaning the gas path of the gas collection device 100, control the two electric three-way valves 1033 to simultaneously connect the bypass pipe 1031 and the collection pipe 1032, so as to maintain the fluidity of the clean gas in the gas collection device 100.

[0055] That is to say, the gas collection device 100 has at least two working modes, namely, a collection mode and a cleaning mode. The gas collection device 100 collects the target gas in the collection mode and cleans its own gas path in the cleaning mode. In this embodiment, when the gas collection device 100 is in the collection mode, the central controller 101 cuts off the bypass pipe 1031 and connects the collection pipe 1032 by controlling the two electric three-way valves 1033. At this time, the air intake pipe 104 cannot transport the target gas to the bypass pipe 1031, but transports the target gas to the collection pipe 1032 for storage; when the gas collection device 100 is in the cleaning mode, the central controller 101 controls the two electric three-way valves 1033 to simultaneously connect the bypass pipe 1031 and the collection pipe 1032. At this time, the air inlet pipe 104 will not only deliver the clean gas to the bypass pipe 1031, but also deliver the clean gas to the collection pipe 1032, that is, the clean gas will flow through the bypass pipe 1031 and the collection pipe 1032 at the same time, instead of only flowing through the collection pipe 1032 as in the collection mode. In this way, the fluidity of the clean gas in the gas path of the gas collection device 100 can be maintained, thereby improving the cleaning effect of the gas path of the gas collection device 100, and cleaning the gas path of the gas collection device 100 can further avoid the occurrence of cross contamination. In addition, it should be noted that the collection efficiency of the target gas by the gas collection device 100 in the collection mode is positively correlated with the number of collection pipes 1032. Generally, the more the number of collection pipes 1032, the higher the collection efficiency of the target gas. The specific number of collection pipes 1032 can be selected according to actual needs, and this application does not make a sole limitation on this. It should also be noted that in other embodiments, the electric three-way valve 1033 can be replaced by a conventional three-way valve that requires manual operation.

[0056] In some embodiments, see Figure 2 In addition to the structure given above, the gas collection device 100 also includes a touch screen 112 and a hollow control box (not shown). The control box is arranged on the frame, the touch screen 112 is embedded in the outer wall of the control box, and the central controller 101 is arranged in the control box. The touch screen 112 is communicatively connected to the central controller 101. Based on this, the central controller 101 can transmit various data in the target gas collection process to the touch screen 112 for display, such as the temperature data and gas flow rate described above; the staff can enter information through the touch screen 112, such as the identity information of the participants and the serial number, collection time and level of the target gas; the staff can send commands to the central controller 101 through the touch screen 112, such as sending the start collection command, the pause collection command and the end collection command of the target gas to the central controller 101, as well as the adjustment command of parameters such as the collection time and the collection amount, which is not limited to this application.

[0057] In some embodiments, see Figure 2 In addition to the structure given above, the gas collection device 100 also includes a storage module 113 and a communication module 114 respectively connected to the central controller 101. The storage module 113 and the communication module 114 are both arranged in the control box, and the communication module 114 is used to communicate with external devices. Specifically, the storage module 113 is used to store the data sent, received and / or processed by the central controller 101; the communication module 114 is used to establish a communication connection relationship between the central controller 101 and the external device to realize the data interaction between the central controller 101 and the external device. In other words, the central controller 101 can transmit various data in the target gas collection process to the storage module 113 for storage, such as temperature data, gas flow, identity information of the participants, and the serial number and collection time of the target gas; the central controller 101 can send data to the external device through the communication module 114, or receive data sent by the external device. Exemplarily, the external device is such as the mobile phone, tablet computer and smart wearable device of the staff, etc. Different scenarios may require different external devices, and this application does not make a sole limitation on this. In addition, it should be noted that the communication module 114 can adopt a wired or wireless communication module with communication functions commonly used in the field, such as an Ethernet module, RS-232 / RS-485 module, CAN bus module, Wi-Fi module, Bluetooth module, ZigBee module, LoRa module, NB-IoT module and 4G / 5G module, etc. The specific selection can be based on actual needs, and this application does not make a sole limitation on this.

[0058] In some embodiments, see Figure 2In addition to the structure given above, the gas collection device 100 also includes a battery 115 and a charging management module 116 arranged in the control box. The charging management module 116 is communicatively connected to the central controller 101, the central controller 101 is electrically connected to the battery 115, and the battery 115 is electrically connected to the charging management module 116. The charging management module 116 is used to electrically connect to an external power supply. Based on this, when the charging management module 116 is electrically connected to the external power supply, the charging management module 116 can charge the battery 115 based on the electric energy provided by the external power supply, and the battery 115 can power the central controller 101, so that the gas collection device 100 can collect the target gas; when there is no external power supply, the battery 115 can still use its own stored electric energy to power the central controller 101, that is, the gas collection device 100 can still collect the target gas. In addition, it should be noted that the battery 115 is not limited to powering the central controller 101, but actually powers all electrical devices in the gas collection device 100. It should also be noted that the battery 115 can be a single battery or a battery pack composed of several batteries 115. As for how many batteries 115 are set, it can be selected according to actual needs, and this application does not make a sole limitation on this.

[0059] See also Figure 4 , Figure 4 It is a module block diagram of a gas analysis system. The present embodiment provides a gas analysis system, including a gas analysis device 200 and the gas collection device 100 described above, and the gas analysis device 200 is connected to the gas collection device 100. Specifically, the gas collection device 100 is used to collect target gas containing volatile organic matter; the gas analysis device 200 is used to obtain the target gas in the gas collection device 100 and analyze the target gas. In the present embodiment, the gas analysis device 200 can adopt any equipment with a gas analysis function commonly used in the art, such as an electrochemical gas analyzer, an infrared spectrometer gas analyzer, a gas chromatograph, a thermal conductivity gas analyzer, and a laser gas analyzer, etc. The specific selection can be based on actual needs, and the present application does not make a sole limitation on this.

[0060] In some embodiments, for the gas collection device 100, the collection device 103 therein supports quick disassembly, that is, the collection device 103 can be quickly connected to the gas path of the gas collection device 100, and can also be quickly detached from the gas path of the gas collection device 100. Based on this, after the gas collection device 100 completes the collection of the target gas, the staff can take the collection device 103 out of the gas collection device 100, and then transfer the taken out collection device 103 to the gas analysis device 200, so that the gas analysis device 200 can analyze the target gas in the collection device 103.

[0061] See also Figure 5 , Figure 5 It is a flow chart of the gas collection method. This embodiment provides a gas collection method, which is applied to the central controller 101 of the gas collection device 100 described above, including steps 501 to 503 (abbreviated as S501 to S503), namely: S501, obtaining the temperature data in the intake pipe; S502, judging whether the temperature data is within the preset temperature range, and when it is not within the preset temperature range, controlling the heating device to adjust the heating amount of the intake pipe so that the temperature data is within the preset temperature range; S503, controlling the sampling pump to start, so as to form a negative pressure at the pipe mouth of the intake pipe away from the collection device through the sampling pump, so that the target gas containing volatile organic compounds outside is sucked into the intake pipe and transported to the collection device through the intake pipe for storage. It should be noted that for the unfinished description of the gas collection method, please refer to the relevant description of the gas collection device 100 in the previous text, and the present application will not elaborate on it here.

[0062] The above embodiments are only preferred implementations of the present application, and are not the only limitations on the gas collection device 100, the gas analysis system and related methods. In this regard, those skilled in the art can flexibly set them according to the actual application scenarios based on the above embodiments. It can be understood that, through the implementation of the above embodiments of the present application, a gas collection device 100 is composed of a central controller 101, an air intake pipe 104, a collecting device 103, and a sampling pump 102, a heating device 106, and a temperature detector 105 respectively communicatively connected to the central controller 101. The sampling pump 102, the collecting device 103, and the air intake pipe 104 are connected in sequence, the temperature detector 105 is arranged on the inner wall of the air intake pipe 104, and the heating device 106 is in contact with the outer wall of the air intake pipe 104; wherein, after the sampling pump 102 is started, the target gas containing volatile organic compounds outside can be sucked into the air intake pipe 104, the air intake pipe 104 can transport the target gas to the collecting device 103 for storage, and the temperature detector 105 can detect the temperature data in the air intake pipe 104 in real time, and the central controller 101 can control the heating device 106 to adjust the heating amount of the air intake pipe 104 when the temperature data is not within the preset temperature range, so that the temperature data is within the preset temperature range. It is understandable that the temperature of the target gas is usually higher than the ambient temperature. Then in the traditional solution, when the target gas encounters the intake pipe 104 with a lower temperature, the volatile organic compounds in the target gas will easily remain in the intake pipe 104, especially the volatile organic compounds with high boiling points, which leads to cross contamination. In this regard, the present application will use the heating device 106 to regulate the temperature in the intake pipe 104, so that the temperature in the intake pipe 104 is always within a preset temperature range, such as maintaining the temperature in the intake pipe 104 at 37°C or above. In this case, the temperature in the intake pipe 104 will be higher than or equal to the temperature of the target gas, which can greatly reduce the residue of volatile organic compounds in the intake pipe 104 and avoid cross contamination. It can not only ensure the collection effect of the gas collection device 100 on the target gas, but also improve the accuracy of subsequent analysis of the target gas.

[0063] It should be noted that the several embodiments shown in the present application are described in a progressive manner, and each embodiment focuses on the differences from other embodiments, and the same or similar parts between the various embodiments can refer to each other. It should also be noted that in the text description of the present application, relational terms such as first and second are only used to distinguish one entity or operation from another entity or operation, and do not necessarily require or imply that there is such an actual relationship or order between these entities or operations. Further, the terms "include", "comprise" or any other corresponding variants are intended to cover non-exclusive inclusion, so that the process, method, article or equipment including a series of elements includes not only these elements, but also other elements that are not explicitly listed, or may also include elements inherent to such process, method, article or equipment; and, in the absence of more restrictions, the elements defined by the sentence "including one..." do not exclude the existence of other identical elements in the process, method, article or equipment including the elements.

[0064] In addition, by implementing the several embodiments shown above in the present application, professionals and technicians in this field can implement or use the present application. For the several embodiments shown above in the present application, various modifications will be obvious to professionals and technicians in this field, and the general principles defined in the present application can be implemented in other embodiments not shown without departing from the spirit or scope of the present application. Therefore, the present application will not be limited to the several embodiments shown above, but will comply with the widest range consistent with the principles and novel features disclosed in the present application.

Claims

1. A gas collection device, characterized in that: The device is used to collect target gas containing volatile organic compounds, and comprises a rack, a central controller, an air intake pipe, a collecting device, and a sampling pump, a heating device, and a temperature detector respectively connected to the central controller in communication. The central controller, the sampling pump, the collecting device, and the heating device are all arranged on the rack, the sampling pump, the collecting device, and the air intake pipe are connected in sequence, the heating device is in contact with the outer wall of the air intake pipe, and the temperature detector is arranged on the inner wall of the air intake pipe, wherein: The sampling pump is used to form a negative pressure at the pipe opening of the air inlet pipe away from the collecting device, so as to suck the external target gas into the air inlet pipe; The air inlet pipe is used to transport the target gas to the collection device; The collecting device is used to store the target gas; The heating device is used to heat the air intake pipe; The temperature detector is used to detect the temperature data in the intake pipe in real time; The central controller is used to determine whether the temperature data is within a preset temperature range, and when it is not within the preset temperature range, control the heating device to adjust the heating amount of the intake pipe so that the temperature data is within the preset temperature range to avoid the volatile organic matter from remaining in the intake pipe.

2. The gas collection device according to claim 1, characterized in that: The heating device includes a heating sleeve and a power supply communicatively connected to the central controller, the heating sleeve is mounted on the outer wall of the air intake pipe, the power supply is arranged on the frame and electrically connected to the heating sleeve, wherein: The power supply is used to deliver a heating current to the heating sleeve to heat the heating sleeve; The heating jacket is used to heat the air intake pipe by the heat emitted by the heating jacket; The central controller is specifically used to control the power supply to adjust the size of the heating current when the temperature data is not within the preset temperature range, so as to adjust the heating amount of the heating sleeve on the intake pipe so that the temperature data is within the preset temperature range.

3. The gas collection device according to claim 2, characterized in that: The heating sleeve comprises a heating element, a terminal, an insulating layer, and an inner layer and an outer layer opposite to each other, wherein the inner layer is used to contact the outer wall of the air intake pipe, the insulating layer is arranged between the inner layer and the outer layer, the heating element is arranged between the insulating layer and the inner layer, the terminal is arranged on the outer layer, and the heating element is electrically connected to the power supply through the terminal, wherein: The connecting terminal is used to transmit the heating current provided by the power supply to the heating element to heat the heating element; The heating element is used to heat the intake pipe by the heat emitted by the heating element.

4. The gas collection device according to claim 1, characterized in that: The heating device comprises a water storage jacket and a circulating water heating component, wherein the water storage jacket is sleeved on the outer wall of the air inlet pipe, the circulating water heating component is arranged on the frame and connected to the water storage jacket, and the circulating water heating component is communicatively connected to the central controller, wherein: The circulating water heating component is used to cyclically deliver heating water to the water storage jacket and recover the heating water in the water storage jacket to heat the water storage jacket; The water storage jacket is used to heat the air intake pipe by the heat emitted by the water storage jacket; The central controller is specifically used to control the circulating water heating component to adjust the temperature of the heating water when the temperature data is not within the preset temperature range, so as to adjust the heating amount of the intake pipe heated by the water storage jacket so that the temperature data is within the preset temperature range.

5. The gas collection device according to claim 4, characterized in that: The circulating water heating assembly includes a heater, a water tank, a circulating water pump, a water inlet pipe and a water return pipe. The heater, the water tank and the circulating water pump are all arranged on the frame. The heater contacts the outer wall of the water tank. One end of the water inlet pipe is arranged in the water storage jacket, and the other end is connected to the water tank through the circulating water pump. One end of the water return pipe is arranged in the water storage jacket, and the other end is connected to the water tank through the circulating water pump. The heater and the circulating water pump are respectively connected to the central controller in communication, wherein: The heater is used to heat the heating water stored in the water tank; The circulating water pump is used to cyclically transport the heating water in the water tank to the water storage jacket through the water inlet pipe, and to recover the heating water in the water storage jacket to the water tank through the water return pipe, so as to heat the water storage jacket; The central controller is specifically used to control the heater to adjust the heating amount of the heating water when the temperature data is not within the preset temperature range, so as to adjust the heating amount of the intake pipe heated by the water storage jacket, so that the temperature data is within the preset temperature range.

6. The gas collection device according to claim 1, characterized in that: The target gas is located in the breathing mask or the head space sampler when it is not inhaled into the air inlet pipe, the gas collection device further comprises a first dehydration device, the first dehydration device is arranged on the frame, and the air inlet pipe is used to communicate with the breathing mask or the head space sampler through the first dehydration device; The first dehydration device is used to remove water vapor in the target gas during the process in which the target gas in the breathing mask or the head space sampler is inhaled into the air inlet pipe.

7. The gas collection device according to claim 1, characterized in that: It also includes a flow detector that is communicatively connected to the central controller, the flow detector is disposed on the rack, and the flow detector is connected between the sampling pump and the collection device, wherein: The flow detector is used to detect the gas flow passing through the collection device in real time; The central controller is also used to determine whether the gas flow is within a preset gas flow range, and when it is not within the preset gas flow range, adjust the gas flow by controlling the sampling pump so that the gas flow is within the preset gas flow range.

8. The gas collection device according to claim 7, characterized in that: It also includes a second dewatering device arranged on the frame, the second dewatering device is connected between the flow detector and the collecting device, and is used to block water vapor outside the flow detector.

9. The gas collection device according to claim 7, characterized in that: It also includes a flow regulating device that is communicatively connected to the central controller, the flow regulating device is disposed on the rack, and the flow regulating device is connected between the sampling pump and the flow detector, wherein: The flow regulating device is used to regulate the gas flow; The central controller is specifically used to adjust the gas flow rate by controlling the sampling pump and / or the flow regulating device when the gas flow rate is not within the preset gas flow rate range, so that the gas flow rate is within the preset gas flow rate range.

10. The gas collection device according to claim 9, characterized in that: It also includes a buffer device arranged on the frame, wherein the buffer device is connected between the sampling pump and the flow regulating device and is used to stabilize the gas flow.

11. The gas collection device according to claim 10, characterized in that: The buffer device includes a hollow buffer block having two openings connected to the interior and opposite to each other, one of the openings being used to connect the sampling pump and the buffer block, and the other opening being used to connect the flow regulating device and the buffer block, and the buffer block is filled with buffer material.

12. The gas collection device according to claim 7, characterized in that: It also includes an audible and visual alarm that is communicatively connected to the central controller, and the audible and visual alarm is disposed on the rack; The central controller is also used to: when the gas flow exceeds the upper limit of the preset gas flow range, determine whether the difference between the gas flow and the upper limit is greater than a first preset threshold value, and if it is greater than the first preset threshold value, control the sound and light alarm to sound and light alarm; or, When the gas flow rate is lower than the lower limit value of the preset gas flow rate range, it is determined whether the difference between the lower limit value and the gas flow rate is greater than a second preset threshold value. If it is greater than the second preset threshold value, the sound and light alarm is controlled to sound and light alarm.

13. The gas collection device according to claim 1, characterized in that: The collecting device comprises a bypass pipe, two electric three-way valves and at least one collecting pipe, the two opposite pipe openings of the collecting pipe are respectively connected to the sampling pump and the air intake pipe through the two electric three-way valves, the two opposite pipe openings of the bypass pipe are respectively connected to the sampling pump and the air intake pipe through the two electric three-way valves, and the two electric three-way valves are respectively connected to the central controller for communication, wherein: The sampling pump is also used to suck external clean gas into the gas collection device through the air inlet pipe when cleaning the gas path of the gas collection device; The central controller is also used to: when collecting the target gas, control the two electric three-way valves to cut off the bypass pipe and connect the collection pipe, so as to collect the target gas using the collection pipe; or, when cleaning the gas path of the gas collection device, control the two electric three-way valves to simultaneously connect the bypass pipe and the collection pipe, so as to maintain the fluidity of the clean gas in the gas collection device.

14. The gas collection device according to claim 1, characterized in that: It also includes a touch screen and a hollow control box, wherein the control box is arranged on the frame, the touch screen is embedded in the outer wall of the control box, the central controller is arranged in the control box, and the touch screen is communicatively connected to the central controller.

15. The gas collection device according to claim 14, characterized in that: It also includes a storage module and a communication module respectively connected to the central controller, the storage module and the communication module are both arranged in the control box, and the communication module is used to communicate with external devices, wherein: The storage module is used to store data sent, received and / or processed by the central controller; The communication module is used to establish a communication connection relationship between the central controller and the external device to achieve data interaction between the central controller and the external device.

16. The gas collection device according to claim 14, characterized in that: It also includes a battery and a charging management module arranged in the control box, the charging management module is communicatively connected to the central controller, the central controller is electrically connected to the battery, the battery is electrically connected to the charging management module, and the charging management module is used to electrically connect to an external power supply.

17. A gas analysis system, characterized in that: The invention comprises a gas analysis device and a gas collection device according to any one of claims 1 to 16, wherein: The gas collection device is used to collect target gas containing volatile organic compounds; The gas analysis device is connected to the gas collection device and is used to obtain the target gas in the gas collection device and analyze the target gas.

18. A gas collection method, characterized in that: The central controller used in the gas collection device according to any one of claims 1 to 16 comprises: Obtain temperature data in the intake pipe; determining whether the temperature data is within a preset temperature range, and if it is not within the preset temperature range, controlling the heating device to adjust the heating amount of the intake pipe so that the temperature data is within the preset temperature range; The sampling pump is controlled to start, so that negative pressure is formed at the pipe opening of the air inlet pipe away from the collecting device through the sampling pump, so that the target gas containing volatile organic compounds outside is sucked into the air inlet pipe and transported to the collecting device through the air inlet pipe for storage.

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