High-temperature-resistant gas detection device

Abstract

The invention discloses a high-temperature-resistant gas detection device, and relates to the field of high-temperature gas detection, the high-temperature-resistant gas detection device comprises a shell, a sampling tube and an optical absorption detection unit, the sampling tube is arranged outside the shell; the optical absorption detection unit comprises a gas chamber, a light source, a detector and two window assemblies, the gas chamber is arranged outside the shell, extends in the first direction and is communicated with the sampling pipe, the light source, the detector and the two window assemblies are arranged in the shell, the two window assemblies are arranged at the two ends of the gas chamber, and each window assembly comprises a window piece and a gas isolation piece; the window piece is arranged at the end of the gas chamber, a heat insulation buffering gap is formed between the window piece and the end of the gas chamber, the gas isolation pieces are arranged on the periphery of the window piece, receding holes are formed in the positions corresponding to the end of the gas chamber, the gas isolation pieces are made of high-temperature-resistant low-heat-conduction materials, and the light source is arranged on the side, away from the end of the gas chamber, of one of the two gas isolation pieces. The detector is arranged on one side, far away from the end part of the gas chamber, of the other one of the two gas separators; therefore, the real-time detection precision is high, the response is quick, and the service life is long.

Description

Technical Field

[0001] The present invention relates to the technical field of high temperature gas detection, and in particular to a high temperature resistant gas detection device. Background Art

[0002] With the rapid development of my country's economy and the acceleration of industrial progress, high-temperature gas detection is increasingly used in industrial processes, environmental monitoring and other fields.

[0003] In the industrial production process, it is necessary to measure the gas in a high temperature environment to ensure the stability and safety of the production process. For example, the precursor concentration monitoring of the gas phase delivery system in the semiconductor process, the high temperature NMP (N-methylpyrrolidone) volatile gas monitoring in the lithium battery coating process, etc. The high temperature gas measurement technology is used to detect the composition and concentration of the gas in the industrial process, which can realize the control of the process.

[0004] In the field of environmental monitoring, it is necessary to monitor the exhaust gas, organic matter and other chemical substances emitted to ensure that the emissions meet national standards, so as to control the impact on the environment and human health within a reasonable range, such as greenhouse monitoring of methane and carbon dioxide. The use of high-temperature gas measurement technology can directly obtain emission data, reduce system conversion time, provide accurate data support, facilitate the control of emission parameters in high-temperature environments, and provide protection for the industry's production and environmental emissions.

[0005] Current high-temperature gas detection devices mainly use gas chromatography, catalytic combustion and optical absorption principles for detection. For example, patent CN104535689B discloses the use of gas chromatography detection method to detect high-temperature gas. Although the detection accuracy is high, the operation is complicated, the cost is high, and it is difficult to achieve real-time online detection. In order to change this situation, Japan Riken's patent JP5368291B2 and Shenzhen Wuyanjie Technology's patent CN111044686A both disclose a high-temperature gas detection device based on the principle of catalytic combustion. The gas detection part is placed at the front end of the sampling probe to directly measure the gas. At the same time, the device is designed with an isolated explosion-proof structure to ensure the safety of the detection process. However, the detection device based on the catalytic principle has the disadvantages of poor gas selectivity, short service life, regular maintenance, and insufficient detection accuracy in oxygen-deficient or non-oxygen-rich environments. In comparison, the gas measurement technology based on the optical absorption principle uses the radiation light to measure the absorption characteristics of gas molecules, which can achieve real-time, accurate, non-contact and non-destructive measurement, not only avoiding pollution and other problems, but also ensuring the accuracy and stability of the measurement data, and can respond quickly and accurately to various concentration signals. However, in high-temperature scenarios, its service life and performance are more likely to cause device failure or performance degradation than normal temperature applications. Summary of the invention

[0006] The main purpose of the present invention is to provide a high temperature resistant gas detection device which has high and stable measurement accuracy and is not affected by high temperature.

[0007] To achieve the above object, the present invention provides a high temperature resistant gas detection device, the high temperature resistant gas detection device comprising:

[0008] case;

[0009] A sampling tube is arranged outside the housing and is used for the high temperature gas to be tested to enter and exit; and

[0010] An optical absorption detection unit includes an air chamber, a light source, a detector and two window assemblies. The air chamber is arranged outside the shell and extends along a first direction to be connected to the sampling tube. The light source, the detector and the two window assemblies are arranged in the shell. The two window assemblies are arranged at both ends of the air chamber. Each window assembly includes a window piece and a gas isolation piece. The window piece is arranged at the end of the air chamber and a heat-insulating buffer gap is provided between the window piece and the end of the air chamber. The gas isolation piece is arranged on the outer periphery of the window piece and a avoidance hole is provided corresponding to the end of the air chamber. The material of the gas isolation piece includes a high-temperature resistant and low-thermal conductivity material. The light source is arranged on a side of one of the two gas isolation pieces away from the end of the air chamber, and is used to emit a light beam into the air chamber. The detector is arranged on a side of the other of the two gas isolation pieces away from the end of the air chamber, and is used to receive a light signal emitted after the light beam is absorbed by the high-temperature gas to be measured.

[0011] Optionally, the housing is an explosion-proof housing, and the housing material is an aluminum alloy material with high heat dissipation; and / or,

[0012] Each of the window assemblies further comprises a heating plate, and the heating plate is arranged between the gas isolation member and the window plate.

[0013] Optionally, each of the gas isolation components comprises a window fixing seat and a window pressure cover which are detachably connected in sequence along the first direction, and the window fixing seat is sleeved on the periphery of the air chamber and the window sheet, and is fixedly connected to the housing;

[0014] The window gland is made of PEEK material, and the window fixing seat is made of PEEK material or stainless steel material.

[0015] Optionally, each of the gas isolation components further includes a heat-insulating buffer component, which is disposed in the buffer gap and is sleeved on the outer periphery of the gas chamber and the inner periphery of the window fixing seat, and the heat-insulating buffer component is made of PEEK material.

[0016] Optionally, the middle portion of the bottom wall of the shell is concave to form an accommodating groove and two convex portions arranged on both sides of the accommodating groove;

[0017] The air chamber is arranged in the accommodating groove, the light source and one of the window components are arranged in one of the two convex parts, and the detector and the other of the window components are arranged in the other of the two convex parts;

[0018] The sampling tube is extended along the second direction, and one end of the sampling tube is inserted into the gas chamber and communicated with the gas chamber. The sampling tube is provided with an inlet and an outlet for the high-temperature gas to be measured to enter and exit the gas chamber.

[0019] The second direction is perpendicular to the first direction in a plane.

[0020] Optionally, a first air inlet and a first air outlet are provided on a side wall of the air chamber facing the sampling tube;

[0021] The sampling tube comprises:

[0022] a tube body extending along the second direction, and a vent is provided at a first end of the tube body close to the air chamber to communicate with the air chamber, and a second end of the tube body away from the air chamber is sealed; and

[0023] A partition plate is arranged in the tube body and extends along the second direction so that an air inlet channel and an air outlet channel are formed in the tube body, and the air vent is divided into a second air inlet corresponding to the air inlet channel and a second air outlet corresponding to the air outlet channel. A third air inlet is provided on the peripheral side wall of the air inlet channel at one end away from the air chamber, so that the high-temperature gas to be measured flows into the air chamber through the third air inlet, the second air inlet and the first air inlet in sequence. A third air outlet is provided on the peripheral side wall of the air outlet channel at one end away from the air chamber, so that the high-temperature gas to be measured in the air chamber flows out of the tube body through the first air outlet, the second air outlet and the third air outlet in sequence.

[0024] Optionally, the high temperature resistant gas detection device further comprises a guide adapter inserted into the first end of the tube body, the guide adapter having a first channel and a second channel both penetrating along the first direction, the second air inlet being connected to the air chamber through the first channel, and the second air outlet being connected to the air chamber through the second channel;

[0025] The cross-sectional area of ​​the first channel is smaller than the cross-sectional area of ​​the second air inlet, and the cross-sectional area of ​​the second channel is smaller than the cross-sectional area of ​​the second air outlet.

[0026] Optionally, the high temperature resistant gas detection device further comprises a three-way fixing seat, the three-way fixing seat is arranged in the accommodating groove and is fixedly connected to the shell;

[0027] The air chamber is sleeved in the three-way fixing seat.

[0028] Optionally, the high temperature resistant gas detection device further comprises a transfer fixing head, the transfer fixing head is sleeved in the three-way fixing seat, and the transfer fixing head has a first fixing end and a second fixing end in the second direction;

[0029] The first fixed end has a receiving cavity penetrating along the first direction for receiving the air chamber, and the first fixed end is fixedly connected to the three-way fixing seat;

[0030] The second fixed end is sleeved on the outer circumference of the first end of the tube body and fixedly connected to the tube body. The second fixed end has a third channel and a fourth channel, both of which are arranged to penetrate along the second direction and are connected to the accommodating cavity, so that the first air inlet and the second air inlet are connected through the third channel, and the first air outlet and the second air outlet are connected through the fourth channel.

[0031] Optionally, each of the gas isolation components comprises a window fixing seat and a window pressure cover which are detachably connected in sequence along the first direction, and the window fixing seat is sleeved on the outer periphery of the gas chamber and fixedly connected to the housing and the window sheet;

[0032] The window fixing seat and the window pressure cover are respectively provided with the avoidance holes at the ends corresponding to the air chamber.

[0033] Optionally, the high temperature resistant gas detection device further comprises a display control unit, which is arranged in the housing and comprises a display screen and a controller, and the controller is electrically connected to the display screen and the detector;

[0034] A mounting hole is provided on a side wall of the shell corresponding to the display screen, and a transparent plate is installed at the mounting hole.

[0035] In the technical solution of the present invention, the high-temperature gas to be measured flows into the gas chamber through the sampling tube, the light source emits a light beam into the gas chamber, the light beam is absorbed by the high-temperature gas to be measured and then received by the detector, the concentration of the high-temperature gas to be measured is obtained, and the concentration detection of the high-temperature gas to be measured is completed. The high-temperature resistant gas detection device provided by the present invention adopts the optical absorption principle for detection, and has high real-time detection accuracy, fast response and maintenance-free. The window piece is wrapped with a gas isolation piece made of high-temperature resistant and low thermal conductivity material, which not only plays a supporting role, but also isolates key components such as the light source and the detector from the high-temperature gas to be measured, so that the heat of the high-temperature gas to be measured passes through the gas isolation piece and the hollow area between the window piece and the light source or the detector in turn to reach the light source or the detector. BRIEF DESCRIPTION OF THE DRAWINGS

[0036] 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 some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on the structures shown in these drawings without paying creative work.

[0037] Figure 1 A cross-sectional view of an embodiment of a high temperature resistant gas detection device provided by the present invention;

[0038] Figure 2 for Figure 1 A schematic diagram of a portion of the structure of a medium- and high-temperature-resistant gas detection device;

[0039] Figure 3 for Figure 1 A schematic diagram of a portion of the structure of a medium- and high-temperature-resistant gas detection device;

[0040] Figure 4 for Figure 1 A schematic diagram of a portion of the structure of a medium- and high-temperature-resistant gas detection device;

[0041] Figure 5 for Figure 1 A schematic diagram of the structure of a medium- and high-temperature-resistant gas detection device;

[0042] Figure 6 for Figure 5 The front view of the medium and high temperature resistant gas detection device;

[0043] Figure 7 A cross-sectional view of another embodiment of the high temperature resistant gas detection device provided by the present invention.

[0044] Description of Figure Numbers:

[0045]

[0046]

[0047] The realization of the purpose, functional features and advantages of the present invention will be further explained in conjunction with embodiments and with reference to the accompanying drawings. DETAILED DESCRIPTION

[0048] 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 creative work are within the scope of protection of the present invention.

[0049] It should be noted that if the embodiments of the present invention involve directional indications (such as up, down, left, right, front, back, etc.), the directional indications are only used to explain the relative position relationship, movement status, etc. between the components under a certain specific posture (as shown in the accompanying drawings). If the specific posture changes, the directional indication will also change accordingly.

[0050] In addition, if there are descriptions involving "first", "second", etc. in the embodiments of the present invention, the descriptions of "first", "second", etc. are only used for descriptive purposes and cannot be understood as indicating or implying their relative importance or implicitly indicating the number of technical features indicated. Therefore, the features defined as "first" and "second" may explicitly or implicitly include at least one of the features. In addition, the meaning of "and / or" appearing in the full text includes three parallel schemes. Taking "A and / or B" as an example, it includes scheme A, or scheme B, or a scheme that satisfies both A and B. In addition, the technical solutions between the various embodiments can be combined with each other, but it must be based on the ability of ordinary technicians in the field to implement. When the combination of technical solutions is contradictory or cannot be implemented, it should be deemed that such a combination of technical solutions does not exist and is not within the scope of protection required by the present invention.

[0051] The following is an example of the flammable and explosive high-temperature NMP gas in the lithium battery coating process. As a highly soluble aprotic solvent, NMP is widely used in lithium batteries, medicine, pesticides, electronics, petrochemicals and other industries. Especially in the lithium battery industry, NMP solvent plays the role of mixing active substances, conductive agents and adhesives in the pulping process of lithium batteries. In the coating process, most of the NMP solvent will be heated and evaporated into gas. However, the volatile NMP gas is toxic and can enter the human body through the skin and respiratory tract. When the NMP concentration in the air reaches 100-200ppm, it has an irritating effect on human skin, eyes and respiratory tract, causing symptoms such as headaches and nausea. Long-term exposure to high concentrations of NMP gas can lead to dysfunction of the central nervous system and even death. In addition, NMP gas has the possibility of explosion when mixed with air. Therefore, timely and effective detection of NMP gas is very necessary. During the lithium battery production process, NMP volatile gas detection is carried out in a high temperature environment of 110-150°C, which will affect the service life and performance of the NMP gas detection device.

[0052] In view of this, the present invention provides a high temperature resistant gas detection device 100 for detecting flammable and explosive high temperature NMP gas. Figures 1 to 6 This is an embodiment of a high temperature resistant gas detection device 100 provided by the present invention.

[0053] See also Figures 1 to 6 The high temperature resistant gas detection device 100 comprises a housing 1, a sampling tube 2 and an optical absorption detection unit 3. The sampling tube 2 is arranged outside the housing 1 and is used for the high temperature gas to be detected to enter and exit. The optical absorption detection unit 3 comprises an air chamber 31, a light source 32, a detector 33 and two window assemblies 34. The air chamber 31 is arranged outside the housing 1 and extends along a first direction and is connected to the sampling tube 2. The light source 32, the detector 33 and the two window assemblies 34 are arranged in the housing 1. The two window assemblies 34 are arranged at both ends of the air chamber 31. Each window assembly 34 comprises a window sheet 341 and a gas isolation piece 342. The window piece 341 is arranged at the end of the air chamber 31, and a heat-insulating buffer gap is arranged between the window piece 341 and the end of the air chamber 31. The gas isolation piece 342 is arranged at the outer periphery of the window piece 341, and a avoidance hole is opened corresponding to the end of the air chamber 31. The material of the gas isolation piece 342 includes a high-temperature resistant and low-thermal conductive material. The light source 32 is arranged on a side of one of the two gas isolation pieces 342 away from the end of the air chamber 31, and is used to emit a light beam into the air chamber 31. The detector 33 is arranged on a side of the other of the two gas isolation pieces 342 away from the end of the air chamber 31, and is used to receive a light signal emitted after the light beam is absorbed by the high-temperature gas to be measured.

[0054] In the technical solution of the present invention, the high-temperature gas to be measured (NMP gas) flows into the gas chamber 31 through the sampling tube 2, and the light source 32 emits a light beam into the gas chamber 31. The light beam is absorbed by the high-temperature gas to be measured and then received by the detector 33 to obtain the concentration of the high-temperature gas to be measured, thereby completing the concentration detection of the high-temperature gas to be measured. The high-temperature resistant gas detection device 100 provided by the present invention adopts the optical absorption principle for detection, and has high real-time detection accuracy, fast response and maintenance-free. Since the temperature of the high-temperature gas to be measured is usually as high as 150°C or above, it has a great impact on the optical absorption detection unit 3. Therefore, a gas isolation member 342 made of a high-temperature resistant and low-thermal conductive material is used to wrap the window piece 341, which not only plays a supporting role, but also isolates key components such as the light source 32 and the detector 33 from the high-temperature gas to be measured, so that the heat of the high-temperature gas to be measured passes through the gas isolation member 342 and the hollow area between the window piece 341 and the light source 32 or the detector 33 in turn to reach the light source 32 or the detector 33.

[0055] It should be noted that the light source 32 is a non-dispersive infrared light source or a laser light source. Based on cost considerations, the present embodiment preferably uses a non-dispersive infrared light source.

[0056] It should also be noted that the sampling tube 2 and the gas chamber 31 are non-electronic devices and will not cause explosion, and therefore are arranged outside the housing 1 .

[0057] It should also be noted that the gas isolating member 342 is provided with the avoidance hole to prevent the gas isolating member 342 from obstructing the detector 33 from receiving the optical signal emitted by the light beam after being absorbed by the high-temperature gas to be detected. The material of the gas isolating member 342 is a high-temperature resistant and low-thermal conductive material, such as PEEK (polyetheretherketone) material, which has excellent comprehensive properties such as high-temperature resistance, self-lubrication, corrosion resistance, flame retardancy, hydrolysis resistance, wear resistance and fatigue resistance.

[0058] It should be further noted that, in one embodiment of the present invention, the window piece 341 is a sapphire window piece 341 .

[0059] Furthermore, since NMP gas is flammable and explosive, the shell is an explosion-proof shell, and the shell material is an aluminum alloy material with high heat dissipation. In this way, when an explosive environment appears inside the shell 1, the explosion caused by the electronic device can be prevented from being transmitted to the outside of the shell 1, thereby improving the safety of the high-temperature resistant gas detection device 100. At the same time, the shell 1 is made of an aluminum alloy material with high heat dissipation, which can dissipate the heat conducted to the gas isolation member 342 to the environment to the greatest extent, and finally make the temperature at the light source 32 or the detector 33 as low as 60°C, which can ensure the detection accuracy and service life of the optical absorption detection unit 3.

[0060] For details, please refer to Figure 1 , Figure 3 and Figure 4 Each of the window assemblies 34 further includes a heating plate 35, which is disposed between the gas isolation member 342 and the window plate 341. In this way, the window plate 341 is heated by the heating plate 35, so that the temperature of the window plate 341 rises, thereby preventing NMP vapor from condensing on the window plate 341 and affecting the accuracy of the detection result of the high-temperature gas concentration to be measured.

[0061] It should be noted that, in the present invention, the above two technical features can be set selectively or simultaneously. Specifically, in one embodiment of the present invention, the above two technical features are set simultaneously, that is, the shell is an explosion-proof shell, and the shell material is an aluminum alloy material with high heat dissipation, and each of the window assemblies 34 also includes a heating plate 35, and the heating plate 35 is arranged between the gas isolation piece 342 and the window plate 341.

[0062] For details, please refer to Figure 1 , Figure 3 and Figure 4 In one embodiment of the present invention, each of the gas isolation members 342 includes a window fixing seat 3421 and a window pressure cover 3422 which are detachably connected in sequence along the first direction. The window fixing seat 3421 is sleeved on the periphery of the gas chamber 31 and the window sheet 341, and is fixedly connected to the housing 1; the window pressure cover 3422 is made of PEEK material, and the window fixing seat 3421 is made of PEEK material or stainless steel material. In this way, it is convenient to disassemble and install the window sheet 341, and when the window fixing seat 3421 is made of stainless steel material, it not only has high temperature resistance and low thermal conductivity, but also can better meet the explosion-proof requirements of the gas detection device.

[0063] It should be noted that, in the present invention, the connection method between the window fixing seat 3421 and the window pressure cover 3422 is not limited. More specifically, in one embodiment of the present invention, the window fixing seat 3421 and the window pressure cover 3422 are first bonded with high-temperature resistant epoxy resin and then locked and fixed with screws.

[0064] Of course, in the present invention, the connection method between the window fixing seat 3421 and the shell 1 and the window piece 341 is not restricted. Specifically, in one embodiment of the present invention, the window fixing seat 3421 and the shell 1 are first bonded with a high-temperature resistant epoxy resin, and then locked and fixed with a hexagonal stud. The window fixing seat 3421 and the window piece 341 are first bonded with a high-temperature resistant epoxy resin, and then locked and fixed with screws.

[0065] For further information, see Figure 7 In another embodiment of the present invention, each of the gas isolation components 342 also includes a thermal insulation buffer component 3423, which is arranged in the buffer gap and is sleeved on the outer periphery of the gas chamber 31 and the inner periphery of the window fixing seat 3421; the thermal insulation buffer component 3423 and the window pressure cover 3422 are respectively made of PEEK material, and the window fixing seat 3421 is made of PEEK material and stainless steel material.

[0066] In this way, the heat conduction path of the heat of the high-temperature gas to be measured is divided into two paths: one is that the heat passes through the window fixing seat 3421, the window plate 341, and the window pressure cover 3422 in sequence and then reaches the light source 32 or the detector 33, and the other is that the heat passes through the window fixing seat 3421, the thermal insulation buffer 3423, the window plate 341 and the window pressure cover 3422 in sequence and then reaches the light source 32 or the detector 33.

[0067] Furthermore, a gap is provided between the fixing seat 3421 and the window piece 341 .

[0068] For details, please refer to Figure 4 The middle part of the bottom wall of the shell 1 is concave to form a receiving groove 11 and two protrusions 12 arranged on both sides of the receiving groove 11; the air chamber 31 is arranged in the receiving groove 11, the light source 32 and a window component 34 are arranged in one of the two protrusions 12, and the detector 33 and another window component 34 are arranged in the other of the two protrusions 12; the sampling tube 2 is extended along the second direction, and one end of it is inserted into the air chamber 31 and communicated with the air chamber 31, and an inlet and an outlet are opened on the sampling tube 2 for the high-temperature gas to be measured to enter and exit the air chamber 31; wherein the second direction is perpendicular to the first direction in the plane.

[0069] For further information, see Figures 1 to 3 The air chamber 31 is provided with a first air inlet 311 and a first air outlet 312 on a side wall facing the sampling tube 2; the sampling tube 2 comprises a tube body 21 and a partition plate 22, the tube body 21 is extended along the second direction, and a vent is provided at a first end thereof close to the air chamber 31 to communicate with the air chamber 31, and a second end of the tube body 21 away from the air chamber 31 is sealed; the partition plate 22 is arranged in the tube body 21 and is extended along the second direction so that an air inlet channel 211 and an air outlet channel 212 are formed in the tube body 21, and the vent is divided into a first air inlet channel 211 and a second air outlet channel 212 to communicate with the ... A second air inlet corresponding to the channel 211 and a second air outlet corresponding to the air outlet channel 212, a third air inlet is provided on the peripheral side wall of the air inlet channel 211 away from the air chamber 31, so that the high-temperature gas to be measured flows into the air chamber 31 through the third air inlet, the second air inlet and the first air inlet 311 in sequence, and a third air outlet is provided on the peripheral side wall of the air outlet channel 212 away from the air chamber 31, so that the high-temperature gas to be measured in the air chamber 31 flows out of the tube body 21 through the first air outlet 312, the second air outlet and the third air outlet in sequence.

[0070] In this way, the pressure difference generated by the flow of the high-temperature gas to be tested in the external detection environment of the high-temperature resistant gas detection device 100 is utilized to make the high-temperature gas to be tested automatically enter the sampling tube 2 and the gas chamber 31 in turn. There is no need to use high-temperature resistant pump suction sampling, and the adverse effects of the high-temperature gas to be tested on the optical absorption detection unit 3 are reduced.

[0071] It should be noted that, in an embodiment of the present invention, the high temperature resistant gas detection device 100 is located in an oven of a lithium battery positive electrode plate to detect the concentration of a high temperature gas to be tested.

[0072] It should also be noted that when the high temperature resistant gas detection device 100 is installed, the third air inlet faces the airflow direction.

[0073] More specifically, sealing rings are provided on the outer periphery of the second air inlet and the outer periphery of the second air outlet to improve air tightness and prevent gas leakage.

[0074] For further information, see Figure 1 and Figure 2 The high temperature resistant gas detection device 100 further includes a guide adapter 4 inserted into the first end of the tube body 21, the guide adapter 4 has a first channel and a second channel both penetrating along the first direction, the second air inlet is connected to the air chamber 31 through the first channel, and the second air outlet is connected to the air chamber 31 through the second channel; the cross-sectional area of ​​the first channel is smaller than the cross-sectional area of ​​the second air inlet, and the cross-sectional area of ​​the second channel is smaller than the cross-sectional area of ​​the second air outlet. In this way, when the high temperature gas to be measured flows, the cross-sectional area of ​​the gas path changes, which can reduce the air flow resistance and facilitate the rapid flow of the high temperature gas to be measured.

[0075] For details, please refer to Figure 1 and Figure 2 The high temperature resistant gas detection device 100 further includes a three-way fixing seat 5, which is disposed in the accommodating groove 11 and fixedly connected to the housing 1; the gas chamber 31 is sleeved in the three-way fixing seat 5. In this way, the three-way fixing seat 5 realizes the fixed connection between the gas chamber 31 and the housing 1.

[0076] It should be noted that, in the present invention, the connection method between the three-way fixing seat 5 and the housing 1 is not limited, and can be adhesively connected or threadedly connected, etc. Specifically, in an embodiment of the present invention, the three-way fixing seat 5 and the housing 1 are fixedly connected by screws.

[0077] For further information, see Figure 1 and Figure 2The high temperature resistant gas detection device 100 also includes an adapter fixing head 6, which is sleeved in the three-way fixing seat 5, and the adapter fixing head 6 has a first fixed end 61 and a second fixed end 62 in the second direction; the first fixed end 61 has a accommodating cavity arranged along the first direction, for accommodating the air chamber 31, and the first fixed end 61 is fixedly connected to the three-way fixing seat 5; the second fixed end 62 is sleeved on the outer periphery of the first end of the tube body 21, and is fixedly connected to the tube body 21, and the second fixed end 62 has a third channel and a fourth channel, both of which are arranged along the second direction and are connected to the accommodating cavity, so that the first air inlet 311 and the second air inlet are connected through the third channel, and the first air outlet 312 and the second air outlet are connected through the fourth channel.

[0078] In this way, the air chamber 31 is fixedly connected to the three-way fixing seat 5 and the sampling tube 2 is fixedly connected to the air chamber 31 through the adapter fixing head 6, and the air path is sealed.

[0079] It should be noted that, in the present invention, the connection method of the adapter fixing head 6, the three-way fixing seat 5, and the sampling tube 2 is not limited, and can be bonded, threaded, etc. Specifically, in one embodiment of the present invention, the adapter fixing head 6, the three-way fixing seat 5, and the sampling tube 2 are all fixedly connected by screws.

[0080] For details, please refer to Figure 1 , Figure 2 , Figure 5 and Figure 6 , a flange 7 is provided on the outer periphery of the sampling tube 2. In this way, the high temperature resistant gas detection device 100 can be fixedly installed through the flange 7. More specifically, in one embodiment of the present invention, the high temperature gas detection device to be tested is connected to the oven air duct flange 7 of the lithium battery positive electrode plate through the flange 7.

[0081] For details, please refer to Figure 1 , Figure 4 and Figure 5 The high temperature resistant gas detection device 100 also includes a display control unit, which is arranged in the housing 1 and includes a display screen 8 and a controller, and the controller is electrically connected to the display screen 8 and the detector 33; a mounting hole is provided on a side wall of the housing 1 corresponding to the display screen 8, and a transparent plate is installed at the mounting hole. In this way, the detection result of the detector 33 is transmitted to the controller for analysis to obtain a concentration signal and then transmitted to the display screen 8 for display, which is convenient for staff to view.

[0082] Furthermore, the high temperature resistant gas detection device 100 also includes an alarm unit, and the controller is electrically connected to the alarm unit to control the working state of the alarm unit. More specifically, when the detection result of the high temperature gas concentration to be measured exceeds a preset safety threshold, the controller controls the alarm unit to alarm, and promptly reminds the staff, which is conducive to improving the work safety of the staff.

[0083] Furthermore, the alarm unit includes a buzzer and / or an alarm light.

[0084] The above description is only a preferred embodiment of the present invention, and does not limit the patent scope of the present invention. All equivalent structural changes made by using the contents of the present invention specification and drawings under the inventive concept of the present invention, or directly / indirectly applied in other related technical fields are included in the patent protection scope of the present invention.

Claims

1. A high temperature resistant gas detection device, characterized in that: The high temperature resistant gas detection device comprises: case; A sampling tube is arranged outside the housing and is used for the high temperature gas to be tested to enter and exit; and An optical absorption detection unit includes an air chamber, a light source, a detector and two window assemblies. The air chamber is arranged outside the shell and extends along a first direction to be connected to the sampling tube. The light source, the detector and the two window assemblies are arranged in the shell. The two window assemblies are arranged at both ends of the air chamber. Each window assembly includes a window piece and a gas isolation piece. The window piece is arranged at the end of the air chamber and a heat-insulating buffer gap is provided between the window piece and the end of the air chamber. The gas isolation piece is arranged on the outer periphery of the window piece and a avoidance hole is provided corresponding to the end of the air chamber. The material of the gas isolation piece includes a high-temperature resistant and low-thermal conductivity material. The light source is arranged on a side of one of the two gas isolation pieces away from the end of the air chamber, and is used to emit a light beam into the air chamber. The detector is arranged on a side of the other of the two gas isolation pieces away from the end of the air chamber, and is used to receive a light signal emitted after the light beam is absorbed by the high-temperature gas to be measured.

2. The high temperature resistant gas detection device according to claim 1, characterized in that: The housing is an explosion-proof housing, and the housing material is an aluminum alloy material with high heat dissipation; and / or, Each of the window assemblies further comprises a heating plate, and the heating plate is arranged between the gas isolation member and the window plate.

3. The high temperature resistant gas detection device according to claim 1, characterized in that: Each of the gas isolation components comprises a window fixing seat and a window pressure cover which are detachably connected in sequence along the first direction, wherein the window fixing seat is sleeved on the outer periphery of the air chamber and the window sheet and is fixedly connected to the housing; The window gland is made of PEEK material, and the window fixing seat is made of PEEK material or stainless steel material.

4. The high temperature resistant gas detection device according to claim 3, characterized in that: Each of the gas isolation components further includes a heat-insulating buffer component, which is arranged in the buffer gap and sleeved on the outer periphery of the gas chamber and the inner periphery of the window fixing seat, and the heat-insulating buffer component is made of PEEK material.

5. The high temperature resistant gas detection device according to claim 1 or 2, characterized in that: The middle part of the bottom wall of the shell is concave to form a receiving groove and two convex parts arranged on both sides of the receiving groove; The air chamber is arranged in the accommodating groove, the light source and one of the window components are arranged in one of the two convex parts, and the detector and the other of the window components are arranged in the other of the two convex parts; The sampling tube is extended along the second direction, and one end of the sampling tube is inserted into the gas chamber and communicated with the gas chamber. The sampling tube is provided with an inlet and an outlet for the high-temperature gas to be measured to enter and exit the gas chamber. The second direction is perpendicular to the first direction in a plane.

6. The high temperature resistant gas detection device according to claim 5, characterized in that: A first air inlet and a first air outlet are formed on a side wall of the air chamber facing the sampling tube; The sampling tube comprises: a tube body extending along the second direction, and a vent is provided at a first end of the tube body close to the air chamber to communicate with the air chamber, and a second end of the tube body away from the air chamber is sealed; and A partition plate is arranged in the tube body and extends along the second direction so that an air inlet channel and an air outlet channel are formed in the tube body, and the air vent is divided into a second air inlet corresponding to the air inlet channel and a second air outlet corresponding to the air outlet channel. A third air inlet is provided on the peripheral side wall of the air inlet channel at one end away from the air chamber, so that the high-temperature gas to be measured flows into the air chamber through the third air inlet, the second air inlet and the first air inlet in sequence. A third air outlet is provided on the peripheral side wall of the air outlet channel at one end away from the air chamber, so that the high-temperature gas to be measured in the air chamber flows out of the tube body through the first air outlet, the second air outlet and the third air outlet in sequence.

7. The high temperature resistant gas detection device according to claim 6, characterized in that: The high temperature resistant gas detection device further comprises a guide adapter inserted into the first end of the tube body, the guide adapter having a first channel and a second channel both penetrating along the first direction, the second air inlet communicating with the air chamber through the first channel, and the second air outlet communicating with the air chamber through the second channel; The cross-sectional area of ​​the first channel is smaller than the cross-sectional area of ​​the second air inlet, and the cross-sectional area of ​​the second channel is smaller than the cross-sectional area of ​​the second air outlet.

8. The high temperature resistant gas detection device according to claim 6, characterized in that: The high temperature resistant gas detection device further comprises a three-way fixing seat, which is arranged in the accommodating groove and fixedly connected to the shell; The air chamber is sleeved in the three-way fixing seat.

9. The high temperature resistant gas detection device according to claim 8, characterized in that: The high temperature resistant gas detection device further comprises a transfer fixing head, the transfer fixing head is sleeved in the three-way fixing seat, and the transfer fixing head has a first fixing end and a second fixing end in the second direction; The first fixed end has a receiving cavity penetrating along the first direction for receiving the air chamber, and the first fixed end is fixedly connected to the three-way fixing seat; The second fixed end is sleeved on the outer circumference of the first end of the tube body and fixedly connected to the tube body. The second fixed end has a third channel and a fourth channel, both of which are arranged to penetrate along the second direction and are connected to the accommodating cavity, so that the first air inlet and the second air inlet are connected through the third channel, and the first air outlet and the second air outlet are connected through the fourth channel.

10. The high temperature resistant gas detection device according to claim 1, characterized in that: The high temperature resistant gas detection device further comprises a display control unit, which is arranged in the housing and comprises a display screen and a controller, wherein the controller is electrically connected to the display screen and the detector; A mounting hole is provided on a side wall of the shell corresponding to the display screen, and a transparent plate is installed at the mounting hole.

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