A multi-path multi-component gas detection device

Abstract

The application discloses a kind of multi-path multi-component gas detection devices, it is related to gas detection technical field, including the heat preservation box of being sleeved in the outside of detection mechanism, and the heating tank of being sleeved in the outside of heat preservation box, and high boiling point heating liquid is filled between heating tank and heat preservation box, hollow cavity of built-in low boiling point heat preservation liquid is opened in the wall of heat preservation box, and adjusting box with piston push plate is arranged in hollow cavity, and blower and switch assembly are installed in the inner wall of heat preservation box, and electric heating element and sliding rheostat are installed on the outer wall of heat preservation box, piston push plate is connected with first connecting rod, second connecting rod respectively in the sliding contact of switch assembly, sliding rheostat electric terminal, the low boiling point heat preservation liquid of the present application is heated to low boiling point heat preservation liquid by high boiling point heating liquid, then heat preservation is carried out to detection mechanism, and whether the piston push plate in adjusting box is used to adjust blower work and electric heating element heating efficiency, so that detection mechanism works in constant temperature environment.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of optical path gas detection, in particular to a multi-optical path multi-component gas detection device. BACKGROUND

[0002] In recent years, with the rapid development of modern industrial and agricultural production, environmental pollution problems are becoming more and more prominent, among which the pollution components in the atmosphere mainly include CO2, NO2, SO2, CO, NO and other gases. Monitoring multiple gases at the same time can form a better environmental evaluation system; real-time monitoring of key gases in the industrial process can ensure the reliable operation of production and the safety of workers; when the transformer fails, it will produce CH2, C2H2, H2, CO and CO gases, and according to the standard judgment standard, the safety status and fault reason of the transformer can be judged; in the medical field, multiple gases exhaled by the human body can be used as biomarkers for medical diagnosis, and combined detection of multiple biomarkers can further improve the accuracy of disease diagnosis. Therefore, simultaneous detection of multiple-component gases has become the development trend of future gas detection.

[0003] Gas detection began to develop rapidly in the 1990s, and many new methods and principles appeared. From the essence, it mainly includes physical methods and chemical methods. Physical methods mainly include optical interference method, thermal conductivity method, differential absorption spectroscopy method, Fourier transform spectroscopy method and non-dispersive infrared method, and the chemical method commonly used is electrochemical method. Compared with the electrochemical method, the non-dispersive infrared method has the advantages of simple structure, low cost, good stability, multiple components measured, high measurement accuracy and the like, and is an ideal monitoring equipment for continuous emission monitoring system (CEMS) of industrial pollution sources.

[0004] However, the existing non-dispersive infrared detection equipment will be disturbed by external environmental factors during use, resulting in a problem of decreased detection accuracy. For example, temperature fluctuations can cause: 1) fluctuations in the output voltage of the infrared light source chip, thereby causing fluctuations in the illumination intensity of the infrared light source; 2) affecting the internal volume of the gas chamber and the absorption rate due to temperature changes; 3) the stability of the infrared detector decreases, making it difficult to obtain accurate measurement results. As can be seen, temperature fluctuations can adversely affect the detection accuracy of the non-dispersive infrared detection equipment. SUMMARY

[0005] The purpose of the present application is to provide a multi-optical path multi-component gas detection device to solve the problems raised in the background art.

[0006] To achieve the above purpose, the present application provides the following technical scheme:

[0007] A multi-path multi-component gas detection device, comprising a detection mechanism with multiple light path channels built-in and a thermostat device for heating and keeping the detection mechanism, wherein the thermostat device comprises

[0008] A heat preservation box, a hollow cavity with low boiling point heat preservation liquid built-in is arranged in the wall of the heat preservation box outside the detection mechanism, and an adjusting box is arranged in the hollow cavity, and a blower and a switch assembly are connected in series and mounted on the inner wall of the heat preservation box, and an electric heating element and a sliding rheostat are connected in series and mounted on the outer wall of the heat preservation box;

[0009] A piston push plate that slides under the expansion of the low boiling point heat preservation liquid is arranged in the adjusting box, and the piston push plate is connected with an elastic pull block that pushes it to slide reversely, the piston push plate is connected with a first connecting rod and a second connecting rod through the sliding electrical terminals of the switch assembly and the sliding rheostat respectively, and under the expansion of the low boiling point heat preservation liquid, the piston push plate slides through the first connecting rod and the second connecting rod to make the switch assembly disconnect and the sliding rheostat increase the resistance of the circuit respectively; and

[0010] A heating box, the inner wall of the heating box and the outer wall of the heat preservation box outside the heating box are filled with high boiling point heating liquid.

[0011] Preferably, the detection mechanism comprises a parabolic mirror, a connecting cylinder, a light-gas mixing cylinder and a detection seat connected in sequence;

[0012] An infrared light source is mounted at the focal point of the parabolic mirror, and the light emitted by the infrared light source forms parallel light that passes through the connecting cylinder, the light-gas mixing cylinder and the detection seat in sequence after being reflected by the parabolic mirror;

[0013] Two light path channels are arranged in the light-gas mixing cylinder, and a first light transmission plate and a second light transmission plate are mounted at the two ends of the light path channels respectively, and an air inlet pipe and an air outlet pipe are connected in sequence between the first light transmission plate and the second light transmission plate;

[0014] Two groups of detection mechanisms corresponding to the two light path channels are arranged in the detection seat, and each detection mechanism comprises a filter for filtering the parallel light and a detector for detecting the filtered parallel light.

[0015] Preferably, the heat preservation box is composed of two heat preservation half-boxes arranged in sequence and connected by tightening bolts, and the heating box is composed of two heating half-boxes arranged in sequence and connected by tightening bolts, and the heat preservation half-boxes and the heating half-boxes are both provided with insertion slots for the air inlet pipe and the air outlet pipe to pass through from top to bottom, and elastic sealing rings are mounted on the inner walls of the insertion slots.

[0016] Preferably, the parabolic mirror, the connecting cylinder, the light-gas mixing cylinder and the detection seat are connected in sequence by tightening bolts.

[0017] Preferably, the adjusting box is fixedly connected with an adjusting box mounting plate, the adjusting box mounting plate is detachably embedded on the inner wall of the heat preservation box, the first connecting rod slides out of the adjusting box mounting plate and is fixedly connected with a first connecting rod cover plate, and the elastic pull block is fixedly connected between the first connecting rod cover plate and the adjusting box mounting plate.

[0018] Preferably, the switch assembly forms a series circuit with the air blower and the air blower driving power supply through wires, the switch assembly comprises a fixedly arranged fixed power connection block and a slidably arranged sliding power connection block, and a sliding power connection block connecting pull rod is fixedly connected between the first connecting rod cover plate and the sliding power connection block.

[0019] Preferably, the fixed power connection block is fixedly mounted on the inner wall of the heat preservation box through a fixed power connection block insulation connecting plate, and the sliding power connection block is fixedly connected with the sliding power connection block connecting pull rod through a sliding power connection block insulation connecting plate.

[0020] Preferably, the electric heating element forms a series circuit with the sliding rheostat and the electric heating element driving power supply through wires, and the second connecting rod is fixedly connected with the sliding rheostat sliding power connection end through an insulation connecting rod.

[0021] Preferably, the heat preservation box is detachably mounted with a protective box, the electric heating element driving power supply and the sliding rheostat are both mounted inside the protective box, and the electric heating element is fixedly mounted on the outside of the protective box through an electric heating element connecting block.

[0022] Preferably, the inner wall of the heating box is fixedly connected with a liquid separation baffle which is located between the inner wall of the heating box and the outer wall of the heat preservation box, the outer wall of the heating box is communicated with two liquid discharge pipes and liquid inlet pipes which are respectively located on the two sides of the liquid separation baffle, and the liquid discharge pipes and the liquid inlet pipes are respectively mounted on the liquid discharge end and the liquid inlet end of the circulating pump.

[0023] Compared with the prior art, the present application has the following advantages:

[0024] The multi-path multi-component gas detection device of the present application heats the low-boiling-point heat preservation liquid by the high-boiling-point heating liquid, then uses the low-boiling-point heat preservation liquid coexisting with the gas to heat the detection mechanism, so that the detection mechanism is in a constant temperature environment, and the piston push plate in the adjusting box is used to adjust whether the air blower works and the heating efficiency of the electric heating element, so as to avoid the problem that the boiling point of the low-boiling-point heat preservation liquid increases when the air pressure rises, which destroys the constant temperature environment of the detection mechanism, thereby ensuring the detection precision of the detection mechanism when working. BRIEF DESCRIPTION OF DRAWINGS

[0025] Figure 1 It is a schematic diagram of the overall structure of the present application;

[0026] Figure 2 It is an exploded view of the detection mechanism in the present application;

[0027] Figure 3 is a decomposition schematic view of the incubator in the present application;

[0028] Figure 4 is Figure 3 is an enlarged schematic view of the connection of the piston push plate, the air blower and the electric heating element in the present application;

[0029] Figure 5 is Figure 4 is an enlarged schematic view of the piston push plate and its connection structure in the present application;

[0030] Figure 6 is Figure 4 is an enlarged schematic view of the electric heating element and its connection structure in the present application;

[0031] Figure 7 is Figure 4 is an enlarged schematic view of the air blower and its connection structure in the present application;

[0032] Figure 8 is a decomposition schematic view of the heating box in the present application.

[0033] In the figure: 1 detection mechanism, 11 reflecting mirror, 111 infrared light source, 12 connecting cylinder, 13 light-gas mixing cylinder, 131 air inlet pipe, 132 air outlet pipe, 133 first light-transmitting plate, 134 second light-transmitting plate, 14 detection seat, 141 light filter, 142 detector, 2 incubator, 21 incubator half box, 22 hollow cavity, 23 adjusting box, 231 adjusting box mounting plate, 24 piston push plate, 25 elastic pull block, 26 air blower, 27 switch assembly, 271 fixed power connection block, 272 sliding power connection block, 273 fixed power connection block insulation connecting plate, 274 sliding power connection block insulation connecting plate, 28 first connecting rod, 281 first connecting rod cover plate, 282 sliding power connection block connecting pull rod, 29 electric heating element, 210 sliding rheostat, 211 second connecting rod, 212 air blower driving power supply, 213 electric heating element driving power supply, 214 protection box, 215 insulation connecting rod, 216 electric heating element connecting block, 3 heating box, 31 heating half box, 32 liquid blocking baffle, 33 liquid discharge pipe, 34 liquid inlet pipe, 35 circulating pump, 4 insertion slot. DETAILED DESCRIPTION

[0034] The technical solutions in the embodiments of the present application will be clearly and completely described in combination with the drawings in the embodiments of the present application. Obviously, the described embodiments are only a part of the embodiments of the present application, rather than all the embodiments. Based on the embodiments in the present application, all the other embodiments obtained by those skilled in the art without creative work belong to the protection scope of the present application.

[0035] Please refer to Figures 1-8 , the present application provides a technical solution:

[0036] A multi-path multi-component gas detection device, comprising a detection mechanism 1 with multiple light path channels and a thermostat device for heating and keeping the detection mechanism 1.

[0037] As an embodiment, the detection mechanism 1 comprises a catadioptric mirror 11, a connecting cylinder 12, a light-gas mixing cylinder 13 and a detection seat 14 connected in sequence from left to right, and the catadioptric mirror 11, the connecting cylinder 12, the light-gas mixing cylinder 13 and the detection seat 14 are detachably fixed and connected by tightening bolts, facilitating disassembly and maintenance of the detection mechanism 1.

[0038] The catadioptric mirror 11 is provided with an infrared light source 111 at the focal point, so that the light emitted by the infrared light source 111 forms parallel light which passes through the connecting cylinder 12, the light-gas mixing cylinder 13 and the detection seat 14 in sequence after being reflected by the catadioptric mirror 11. Two light path channels are provided in the light-gas mixing cylinder 13, and the left and right ends of the light path channels are respectively provided with a first light-transmitting plate 133 and a second light-transmitting plate 134. The light path channels are in communication with an air inlet pipe 131 and an air outlet pipe 132 at intervals from left to right, and the air inlet pipe 131 and the air outlet pipe 132 are located between the first light-transmitting plate 133 and the second light-transmitting plate 134. The detection gas enters the light path channel through the air inlet pipe 131, mixes with the infrared light and absorbs infrared light of corresponding wavelength, and then exits the light path channel from the air outlet pipe 132. The first light-transmitting plate 133 and the second light-transmitting plate 134 are provided to ensure light transmission and prevent the detection gas from diffusing to other mechanisms of the detection mechanism 1 and causing erosion of the other mechanisms. Two groups of detection mechanisms corresponding to the two light path channels are provided in the detection seat 14, and each detection mechanism comprises a filter 141 for filtering the parallel light and a detector 142 for detecting the filtered parallel light. The detector 142 can be an infrared sensor with model TPS2534Gx / Gy.

[0039] When detecting a single component of the detection gas, the same filter 141 is installed in the two detection seats 14, which can filter all light except the wavelength that can be absorbed by the selected component gas molecules. The detection gas is introduced into the light path channel of the detection light path to mix and absorb infrared light of a specific wavelength, and the detection gas is not introduced into the light path channel of the reference light path (or an adsorbent that can absorb the detection gas is arranged at the gas inlet pipe 131 of the light path channel), so that the two light path channels are the same except for the detection gas. By comparing and analyzing the detection results of the two detectors 142, the influence of external environmental factors can be eliminated to a certain extent. When detecting two components of the detection gas, different filters 141 are installed in the two detection seats 14. One filter 141 can filter all light except the wavelength that can be absorbed by the selected component gas molecules. The other filter 141 can filter all light except the wavelength that can be absorbed by the selected component gas molecules. Then the detection gas is sent into the two light path channels, and the two detectors 142 are used to obtain the detection data of the two components in the detection gas, thereby improving the detection efficiency.

[0040] The constant temperature device comprises a heat preservation box 2 sleeved outside the detection mechanism 1 and a heating box 3 sleeved outside the heat preservation box 2. The heat preservation box 2 is composed of two heat preservation half-boxes 21 arranged in an upper and lower manner and detachably connected by tightening bolts. The heating box 3 is composed of two heating half-boxes 31 arranged in an upper and lower manner and detachably connected by tightening bolts. The two detachably connected heat preservation half-boxes 21 facilitate opening and taking out of the detection mechanism 1. The two detachably connected heating half-boxes 31 facilitate opening and taking out of the heat preservation box 2. The heat preservation half-box 21 and the heating half-box 31 are both provided with an insertion slot 4 through which the gas inlet pipe 131 and the gas outlet pipe 132 are oriented upwards and downwards. An elastic sealing ring is installed on the inner wall of the insertion slot 4. The elastic sealing ring improves the sealing performance when the gas inlet pipe 131 and the gas outlet pipe 132 are inserted into the insertion slot 4, thereby avoiding the problem of liquid overflow due to the gap between the gas inlet pipe 131 and the gas outlet pipe 132 after being inserted into the insertion slot 4.

[0041] The plate wall of the incubator 2 sleeved outside the detection mechanism 1 is provided with a hollow cavity 22 containing low-boiling-point incubation liquid. The detection mechanism 1 has good stability when working in a constant temperature environment of 48 degrees, so the low-boiling-point incubation liquid is selected to be a liquid with a boiling point of 48 degrees, such as a mixed solvent of anhydrous ethanol and acetone. The low-boiling-point incubation liquid is heated to a temperature of 48 degrees and starts to vaporize, and does not continue to rise in temperature, so that the incubator 2 is in a constant temperature environment of 48 degrees. The hollow cavity 22 is provided with an adjusting box 23, and the inner wall of the incubator 2 is provided with a series connection of a blower 26 and a switch assembly 27. The blower 26 blows air to the area between the detection mechanism 1 and the inner wall of the incubator 2, improves the heat exchange efficiency between the detection mechanism 1 and the inner wall of the incubator 2, and transfers the heat of the low-boiling-point incubation liquid in the incubator 2 to the detection mechanism 1, so that the detection mechanism 1 is also in a constant temperature environment of 48 degrees, avoiding the problem that the detection precision of the detection mechanism 1 is reduced due to the influence of the temperature fluctuation of the external environment, ensuring the accuracy of the detection result of the detection mechanism 1, and the outer wall of the incubator 2 is provided with a series connection of an electric heating element 29 and a sliding rheostat 210. The heating tank 3 sleeved outside the incubator 2 is filled with high-boiling-point heating liquid between the inner wall of the heating tank 3 and the outer wall of the incubator 2. The high-boiling-point heating liquid is selected to be a liquid with a higher boiling point than the low-boiling-point incubation liquid, such as non-toxic and harmless water. The high-boiling-point heating liquid is heated and emits heat under the heating of the electric heating element 29, so that the heat of the high-boiling-point heating liquid is transferred to the low-boiling-point incubation liquid in the hollow cavity 22 through the outer wall of the incubator 2, thereby achieving the effect of heating the low-boiling-point incubation liquid.

[0042] Further, the adjusting box 23 is slidably provided with a piston push plate 24 which slides under the push of the vaporized and expanded low-boiling-point incubation liquid, that is, the piston push plate 24 divides the internal space of the adjusting box 23 into two regions, one of which stores the low-boiling-point incubation liquid. The heat of the low-boiling-point incubation liquid in the hollow cavity 22 is transferred to the low-boiling-point incubation liquid in the adjusting box 23 through the outer wall of the adjusting box 23, and the piston push plate 24 is connected with an elastic pull block 25 which pushes the piston push plate 24 to slide reversely and reset. The piston push plate 24 is connected with a first connecting rod 28 and a second connecting rod 211 respectively through a sliding electrical connection end of the switch assembly 27 and the sliding rheostat 210. When the heat transferred to the hollow cavity 22 by the high-boiling-point heating liquid is too large, the low-boiling-point incubation liquid in the hollow cavity 22 is in a boiling and vaporizing state for a long time, the air pressure in the hollow cavity 22 increases and the boiling point temperature of the low-boiling-point incubation liquid in the hollow cavity 22 increases, and if it is not adjusted, the temperature of the detection mechanism 1 will rise and the constant temperature environment of the detection mechanism 1 will be destroyed.

[0043] When the problem is encountered, the boiling point temperature of the low-boiling-point heat preservation liquid in the hollow cavity 22 is raised, so that the low-boiling-point heat preservation liquid in the hollow cavity 22 enhances the heating of the low-boiling-point heat preservation liquid in the adjusting box 23, the low-boiling-point heat preservation liquid in the adjusting box 23 vaporizes and expands to push the piston push plate 24 to slide, the elastic pull block 25 is elastically deformed, the piston push plate 24 pulls the switch assembly 27 to disconnect through the first connecting rod 28, so that the air blower 26 stops blowing, the heat exchange effect between the low-boiling-point heat preservation liquid in the hollow cavity 22 and the detection mechanism 1 is reduced, the time for the temperature of the detection mechanism 1 to rise and cause the destruction of the constant-temperature environment thereof is delayed, at the same time, the piston push plate 24 pulls the sliding rheostat 210 to slide to the power-on end through the second connecting rod 211, so that the power-on end of the sliding rheostat 210 is away from the fixed power-on end of the sliding rheostat 210, the heating efficiency of the electric heating element 29 is reduced by increasing the resistance of the sliding rheostat 210 connected to the circuit, so that the heat of the high-boiling-point heating liquid to the low-boiling-point heat preservation liquid is reduced, the low-boiling-point heat preservation liquid in the hollow cavity 22 returns to the normal state, the problem that the temperature rise of the detection mechanism 1 causes the destruction of the constant-temperature environment thereof is eliminated by disconnecting the air blower 26 and reducing the heating efficiency of the electric heating element 29, after the low-boiling-point heat preservation liquid in the hollow cavity 22 returns to the normal state, the low-boiling-point heat preservation liquid vaporized in the adjusting box 23 is liquefied again due to not receiving enough heat, the gas pressure is reduced, the piston push plate 24 drives the first connecting rod 28 and the second connecting rod 211 to slide reversely and reset under the pulling of the elastic pull block 25, so that the air blower 26 continues to work, and the electric heating element 29 restores the original heating efficiency.

[0044] As an embodiment, the adjusting box 23 is fixedly connected with an adjusting box mounting plate 231, and the adjusting box mounting plate 231 is detachably embedded on the inner wall of the heat preservation box 2, that is, the adjusting box mounting plate 231 penetrates through the inner wall of the heat preservation box 2 and extends into the hollow cavity 22, and one end of the adjusting box mounting plate 231 located at the inner wall of the heat preservation box 2 is fixed on the inner wall of the heat preservation box 2 by tightening the bolt, so that the worker can conveniently install the adjusting box 23 in the hollow cavity 22, the piston push plate 24 is slidingly arranged close to the adjusting box mounting plate 231, the first connecting rod 28 is fixedly connected to the end face of the piston push plate 24 close to the adjusting box mounting plate 231, the low-boiling-point heat preservation liquid is stored in the internal region of the adjusting box 23 between the piston push plate 24 and the adjusting box mounting plate 231, the first connecting rod 28 slides out of the adjusting box mounting plate 231 and is fixedly connected with a first connecting rod cover plate 281, and the elastic pull block 25 is fixedly connected between the first connecting rod cover plate 281 and the adjusting box mounting plate 231, the first connecting rod 28 also plays a guiding role in the sliding process of the piston push plate 24, and improves the stability of the sliding process of the piston push plate 24.

[0045] The switch assembly 27 forms a series circuit with the air blower 26 and an air blower driving power supply 212 through wires, the air blower driving power supply 212 is fixedly installed on the inner wall of the heat preservation box 2 and provides power for the air blower 26, and the switch assembly 27 includes a fixedly arranged fixed power connection block 271 and a slidably arranged sliding power connection block 272, the sliding direction of the sliding power connection block 272 relative to the fixed power connection block 271 is parallel to the sliding direction of the piston push plate 24, when the sliding power connection block 272 slides to the fixed power connection block 271, the two are connected to make the switch assembly 27 closed, and when the sliding power connection block 272 slides away from the fixed power connection block 271, the two are separated to make the switch assembly 27 disconnected, specifically, the fixed power connection block 271 is fixedly installed on the inner wall of the heat preservation box 2 through a fixed power connection block insulation connecting plate 273, the sliding power connection block 272 is fixedly connected with a sliding power connection block insulation connecting plate 274, and the cooperation of the fixed power connection block insulation connecting plate 273 and the sliding power connection block insulation connecting plate 274 improves the safety of the switch assembly 27 during use, and the first connecting rod cover plate 281 is fixedly connected with a sliding power connection block connecting pull rod 282, and the sliding power connection block connecting pull rod 282 is fixedly connected with the sliding power connection block insulation connecting plate 274, so that the first connecting rod 28 pulls the sliding power connection block 272 to slide relative to the fixed power connection block 271.

[0046] The electric heating element 29 forms a series circuit with the sliding rheostat 210 and an electric heating element driving power supply 212 through wires, the electric heating element driving power supply 212 provides power for the electric heating element 29, and the second connecting rod 211 is fixedly connected with a sliding power connection end of the sliding rheostat 210 through an insulation connecting rod 215, the arrangement of the insulation connecting rod 215 improves the use safety of the sliding rheostat 210, the sliding direction of the sliding power connection end of the sliding rheostat 210 relative to the fixed power connection end is parallel to the sliding direction of the piston push plate 24, so that the piston push plate 24 drives the sliding power connection end of the sliding rheostat 210 to slide through the second connecting rod 211, thereby changing the resistance of the electric circuit connected with the sliding rheostat 210, so as to change the heating power of the electric heating element 29, the heat preservation box 2 is detachably provided with a protective box 214, and the electric heating element driving power supply 212 and the sliding rheostat 210 are both installed inside the protective box 214, so as to prevent the electric heating element driving power supply 212 and the sliding rheostat 210 from being eroded by the high-boiling heating liquid, and the electric heating element 29 is fixedly installed outside the protective box 214 through an electric heating element connecting block 216, so that the electric heating element 29 continuously heats the high-boiling heating liquid.

[0047] The inner wall of the heating box 3 is fixedly connected with a liquid separation baffle 32 which is located between the inner wall of the heating box 3 and the outer wall of the heat preservation box 2, and the outer wall of the heating box 3 is communicated with two liquid discharge pipes 33 and liquid inlet pipes 34 which are located on the two sides of the liquid separation baffle 32 respectively, and the liquid discharge pipe 33 and the liquid inlet pipe 34 are installed on the liquid discharge end and the liquid inlet end of the circulating pump 35 respectively, so that the high-boiling heating liquid between the inner wall of the heating box 3 and the outer wall of the heat preservation box 2 circulates and flows, and the heating uniformity of the high-boiling heating liquid is improved.

[0048] Working principle: The high-boiling heating liquid is heated and emits heat under the heating of the electric heating element 29, so that the heat of the high-boiling heating liquid is transmitted to the low-boiling heat preservation liquid in the hollow cavity 22 through the outer wall of the heat preservation box 2, the low-boiling heat preservation liquid is heated and the temperature rises to 48 degrees to start vaporization and no longer continue to rise, so that the heat preservation box 2 is in a constant temperature environment of 48 degrees, the air blower 26 blows air to the area between the detection mechanism 1 and the inner wall of the heat preservation box 2, improves the heat exchange efficiency between the detection mechanism 1 and the inner wall of the heat preservation box 2, and the heat of the low-boiling heat preservation liquid in the heat preservation box 2 is transmitted to the detection mechanism 1, so that the detection mechanism 1 is also in a constant temperature environment of 48 degrees.

[0049] When the boiling point temperature of the low-boiling heat preservation liquid in the hollow cavity 22 rises due to the increase of air pressure, the low-boiling heat preservation liquid in the hollow cavity 22 enhances the heating of the low-boiling heat preservation liquid in the adjusting box 23, the low-boiling heat preservation liquid in the adjusting box 23 vaporizes and expands to push the piston push plate 24 to slide, the elastic pull block 25 is elastically deformed, the piston push plate 24 pulls the switch assembly 27 to disconnect through the first connecting rod 28, so that the air blower 26 stops blowing, reduces the heat exchange effect between the low-boiling heat preservation liquid in the hollow cavity 22 and the detection mechanism 1, and at the same time, the piston push plate 24 pulls the sliding rheostat 210 to slide to the electric end through the second connecting rod 211, so that the sliding rheostat 210 slides away from the fixed electric end of the sliding rheostat 210, the heating efficiency of the electric heating element 29 is reduced by increasing the resistance of the sliding rheostat 210 connected to the circuit, so that the heat of the high-boiling heating liquid transported to the low-boiling heat preservation liquid is reduced, and the low-boiling heat preservation liquid in the hollow cavity 22 returns to the normal state.

[0050] After the low-boiling heat preservation liquid in the hollow cavity 22 returns to the normal state, the vaporized low-boiling heat preservation liquid in the adjusting box 23 is liquefied again due to not receiving enough heat, and the air pressure decreases, the piston push plate 24 drives the first connecting rod 28 and the second connecting rod 211 to slide reversely and reset under the pull of the elastic pull block 25, so that the air blower 26 continues to blow, and the electric heating element 29 restores the original heating efficiency.

[0051] While embodiments of the application have been shown and described, it is to be understood that the embodiments described are merely exemplary of the principles and application of the present application. Numerous modifications and adaptions can be effected without departing from the spirit and scope of the present application, which is not limited to the exact construction and arrangement described. It is intended, therefore, to cover all modifications and adaptions that fall within the scope of the claims and their equivalents.

Claims

1. A multi-path multi-component gas detection device, comprising a detection mechanism with multiple light path channels built-in and a thermostat device for heating and keeping the detection mechanism warm, characterized in that: The constant temperature device comprises The heat preservation box is provided with a hollow cavity with low boiling point heat preservation liquid in the box wall outside the detection mechanism, and an adjusting box is arranged in the hollow cavity. An air blower and a switch assembly are connected in series and mounted on the inner wall of the heat preservation box. An electric heating element and a sliding rheostat are connected in series and mounted on the outer wall of the heat preservation box. A piston push plate is slidably arranged in the adjusting box and is pushed to slide by the low boiling point heat preservation liquid vaporized and expanded. The piston push plate is connected with an elastic pull block which pushes the piston push plate to slide reversely. The piston push plate is connected with a first connecting rod and a second connecting rod through a sliding electrical connection end of the switch assembly and the sliding rheostat respectively. The piston push plate is pushed to slide by the low boiling point heat preservation liquid vaporized and expanded, and the first connecting rod and the second connecting rod respectively make the switch assembly disconnected and the sliding rheostat connected to the circuit with increased resistance. The heating box is filled with high boiling point heating liquid between the inner wall of the heating box outside the heat preservation box and the outer wall of the heat preservation box. The detection mechanism comprises a reflecting mirror, a connecting cylinder, a light-gas mixing cylinder and a detection seat connected in sequence. An infrared light source is mounted at the focal point of the reflecting mirror. The light emitted by the infrared light source is reflected by the reflecting mirror to form parallel light which passes through the connecting cylinder, the light-gas mixing cylinder and the detection seat in sequence. Two light path channels are arranged in the light-gas mixing cylinder. First and second light transmission plates are mounted at the two ends of the light path channels respectively. An air inlet pipe and an air outlet pipe are connected to the light path channels at intervals. Two groups of detection mechanisms corresponding to the two light path channels are arranged in the detection seat. Each detection mechanism comprises a filter for filtering the parallel light and a detector for detecting the filtered parallel light. The heat preservation box is composed of two heat preservation half-boxes arranged in sequence and connected by a tightening bolt. The heating box is composed of two heating half-boxes arranged in sequence and connected by a tightening bolt. The heat preservation half-boxes and the heating half-boxes are provided with insertion slots through which the air inlet pipe and the air outlet pipe pass. Elastic sealing rings are mounted on the inner walls of the insertion slots. A liquid separation baffle is fixedly connected to the inner wall of the heating box and separates the heating box and the heat preservation box. Two liquid outlet pipes and two liquid inlet pipes are connected to the two sides of the liquid separation baffle respectively. The liquid outlet pipes and the liquid inlet pipes are mounted on the liquid outlet end and the liquid inlet end of the circulating pump respectively.

2. The multi-path multi-component gas detection device of claim 1, wherein: The reflecting mirror, the connecting cylinder, the light-gas mixing cylinder and the detection seat are connected in sequence by tightening bolts.

3. The multi-path multi-component gas detection device of claim 1, wherein: The adjusting box is fixedly connected with an adjusting box mounting plate which is detachably embedded in the inner wall of the heat preservation box. The first connecting rod extends out of the adjusting box mounting plate and is fixedly connected with a first connecting rod cover plate. The elastic pull block is fixedly connected between the first connecting rod cover plate and the adjusting box mounting plate.

4. The multi-path multi-component gas detection device of claim 3, wherein: The switch assembly forms a series circuit with the air blower and the air blower driving power supply through wires. The switch assembly comprises a fixed electrical connection block and a sliding electrical connection block. A sliding electrical connection block connecting pull rod is fixedly connected between the first connecting rod cover plate and the sliding electrical connection block.

5. The multi-path multi-component gas detection device of claim 4, wherein: The fixed electricity connecting block is fixedly installed on the inner wall of the heat preservation box through a fixed electricity connecting block insulation connecting plate, and the sliding electricity connecting block is fixedly connected with the sliding electricity connecting block connecting pull rod through a sliding electricity connecting block insulation connecting plate.

6. The multi-photons path multi-component gas detection device of claim 1, wherein: The electric heating element forms a series circuit with the sliding rheostat and an electric heating element driving power source through a wire, and the second connecting rod is fixedly connected with the sliding rheostat sliding electricity connecting end through an insulation connecting rod.

7. The multi-path multi-component gas detection device of claim 6, wherein: The heat preservation box outer wall is detachably provided with a protective box, and the electric heating element driving power source and the sliding rheostat are both installed in the protective box, and the electric heating element is fixedly installed on the outer side of the protective box through an electric heating element connecting block.

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