A portable combustible gas alarm calibrating device

Abstract

The present application relates to the technical field of alarm verification, in particular to a portable combustible gas alarm verification device. The device comprises a mixing assembly, which comprises a mixing cavity with two ends in the shape of a conical taper. A honeycomb tube and a porous foam are fixed in the mixing cavity in sequence to divide and mix the gas. The honeycomb tube divides the primary mixed gas flow into a large number of regular micro flow, and the porous foam uses its large specific surface area and complex micro-porous channels to divide, shear and recombine the gas at a micro level in a very compact space. The synergistic effect makes the gas molecules fully diffuse and mix in a very short path and time, overcomes the technical drawbacks of traditional design which relies on increasing flow rate or increasing mixing volume, and realizes the unity of high-precision mixing, fast response and low consumption.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of alarm verification, in particular to a portable combustible gas alarm verification device. BACKGROUND

[0002] The combustible gas alarm is also called gas leakage detection alarm instrument. When combustible gas leaks in industrial environment and daily life environment (such as kitchen using natural gas), the combustible gas alarm detects that the combustible gas concentration reaches the alarm value set by the alarm, and the combustible gas alarm will issue a sound and light alarm signal to remind to take safety measures such as personnel evacuation, forced ventilation, and shutdown of equipment. The combustible gas alarm needs to be verified during use and production.

[0003] In order to ensure the verification accuracy, the gas concentration, temperature and pressure need to be stable in a specific range, and these structures are mostly independent box structures, so the traditional combustible gas alarm verification device is usually large in size. However, in industrial sites or special environments, it is necessary to directly verify and calibrate the combustible gas alarm quickly and accurately. Such large-volume verification devices obviously cannot be applied to such scenes, so portable combustible gas alarm verification devices are gradually applied to such scenes.

[0004] As one of the cores of the portable combustible gas alarm verification device, the MFC mixing system plays a very important role. Engineers set accurate MFC flow parameters through the upper computer, expecting that the gas entering the reaction cavity is instantaneously uniformly mixed. However, in reality, in the gas mixing process, due to the lack of effective flow field regulation and micro diffusion mechanism, the traditional structure is difficult to realize the rapid and uniform distribution of components. Especially in the startup or working condition adjustment stage of the device, different gas flows are prone to stratification due to inertia difference, the high-speed part enters the mixing zone too early, and the low-speed part lingers in the flow channel, forming instantaneous concentration fluctuation. This macroscopic gas flow separation and micro diffusion deficiency cause local concentration unevenness in the mixing cavity, and the so-called "concentration stripe" or "component pulse" phenomenon occurs, thereby seriously affecting the accuracy and repeatability of the verification result.

[0005] In order to overcome the above unevenness, the existing design often takes two "remedial" measures: one is to blindly increase the flow rate to excite turbulence, but this will bring about severe pressure fluctuation and pulsation, which will interfere with the stability of the MFC itself and the reading of the sensor; the second is to greatly increase the volume of the mixing cavity for gas homogenization. This not only significantly increases the dead volume of the system, resulting in a long flushing and stabilization time when switching process gases, wasting a large amount of precious high-purity special gases, but also makes the system response sluggish and unable to adapt to the fast cycle process. In view of this, the present application provides a portable combustible gas alarm verification device. SUMMARY

[0006] The purpose of this invention is to provide a portable combustible gas alarm calibration device to solve the problem mentioned in the background art that existing calibration devices are prone to concentration fluctuations due to uneven gas mixing, and that traditional improvement methods that blindly increase the flow rate or increase the mixing volume make it difficult to balance accuracy and efficiency.

[0007] To address the aforementioned issues, a portable combustible gas alarm calibration device is provided, comprising a housing, inside which is disposed a metering component for metering gas, the metering component including a mass flow controller fixedly disposed inside the housing, and inside the housing further disposed a mixing component, the mixing component including a mixing chamber, the two ends of which are conical.

[0008] The mixing chamber is sequentially fixed with honeycomb tubes and porous foam to separate and mix the gas.

[0009] Both the honeycomb tube and the porous foam are tightly fitted to the inner wall of the mixing chamber, and the porous foam and the honeycomb tube are mutually fitted.

[0010] The honeycomb tubes and the porous tubes are arranged in an alternating manner, and the pore size of the honeycomb tubes is larger than that of the porous tubes.

[0011] The conical structure inside the mixing chamber has multiple guide plates fixedly arranged layer by layer from the inside to the outside, which are used to guide the gas dispersion flow.

[0012] The honeycomb tube contains numerous parallel flow channels, which "segment" the originally concentrated large flow stream into a large number of parallel micro-flow streams, significantly improving the regularity and controllability of the flow and uniformly guiding the gas into the porous foam. Subsequently, the porous foam provides a huge specific surface area and complex interwoven flow channels in an extremely compact physical space, and its mixing efficiency far exceeds that of traditional cavity designs. As the gas passes through countless randomly distributed, tortuous, and tiny pores, it is continuously divided, merged, and redirected. This process greatly enhances the contact opportunities and diffusion efficiency between gas molecules at the microscopic level, so that even extremely small concentration differences are completely eliminated, and finally outputs a highly uniform mixed gas at the molecular level, eliminating the dead volume of the mixing system.

[0013] As a further improvement to this technical solution, a premixing pipe is fixedly connected to one end of the mixing chamber near the guide plate, and the other end of the premixing pipe is fixedly connected to the outlet end of the mass flow controller.

[0014] The guide plate is embedded inside the honeycomb tube at one end near the honeycomb tube.

[0015] The gas at the outlet end of the premixing pipeline enters the inside of the mixing cavity, is first uniformly dispersed under the guidance of each guide plate, and is smoothly guided to the middle position of the mixing cavity, thereby significantly enhancing the uniformity of the gas flow.

[0016] As a further improvement of the technical solution, a plurality of spoiler plates are unevenly fixed inside the premixing pipeline, and the spoiler plates are used to disturb the flow direction of the gas inside the premixing pipeline and guide the preliminary mixing.

[0017] The gas continuously changes the flow path under the disturbance of the unevenly arranged spoiler plates when passing through the premixing pipeline, and continuously collides with other gas molecules and preliminarily mixes in the process of changing the path, effectively breaking the flow rate difference between the center and the edge at the outlet, and laying a foundation for subsequent uniform mixing.

[0018] Compared with the prior art, the beneficial effects of the present application are:

[0019] 1. In the portable combustible gas alarm calibrating device, after the gas is output from the mass flow controller, the gas passes through the premixing pipeline with spoiler plates inside and the guide plates arranged at the inlet of the mixing cavity, effectively breaking the stratification of different gas flows due to inertia difference when the gas flows out of the outlet of the mass flow controller, the high-speed part prematurely enters the mixing zone, and the low-speed part lingers in the flow passage, forming instantaneous concentration fluctuations, suppressing the generation of "concentration stripes" or "component pulses", solving the initial mixing disturbance problem caused by uneven gas flow distribution in traditional devices, and laying a stable and uniform flow field foundation for subsequent uniform mixing at the molecular level.

[0020] 2. In the portable combustible gas alarm calibrating device, after the gas enters the middle position of the mixing cavity through the guide plate, the honeycomb tube divides the preliminarily mixed gas flow into a large number of regular fine flow, and the porous foam uses its large specific surface area and complex micro-porous channels to efficiently divide, shear and recombine the gas at the micro level in a very compact space. This synergistic effect enables the gas molecules to achieve sufficient diffusion and mixing in a very short path and time, and finally outputs gas with highly uniform concentration. This structure fundamentally overcomes the technical drawbacks of traditional designs that rely on increasing flow rate (causing pressure fluctuations) or increasing mixing volume (causing response delay and gas waste), and realizes the unity of high-precision mixing, rapid response and low consumption. BRIEF DESCRIPTION OF DRAWINGS

[0021] Figure 1 is a schematic view of the overall structure of the present application;

[0022] Figure 2 is a rear view of the overall structure of the present application;

[0023] Figure 3 is a cross-sectional view of the shell structure of the present application;

[0024] Figure 4 Structure diagram of the quantitative component of the present application;

[0025] Figure 5 Structure diagram of the quantitative component, mixing component and delivery component of the present application;

[0026] Figure 6 Structure sectional view of the premixing pipeline and mixing chamber of the present application;

[0027] Figure 7 Structure sectional view of the mixing chamber of the present application;

[0028] Figure 8 Structure top view of the deflector of the present application;

[0029] Figure 9 Structure diagram of the delivery component of the present application.

[0030] The meanings of the respective numbers in the figures are as follows:

[0031] 1, housing; 2, quantitative component; 21, mass flow controller; 22, air input pipe; 23, to-be-detected gas delivery pipe; 24, sampling pump; 25, pressure reducing valve;

[0032] 3, mixing component; 31, premixing pipeline; 32, mixing chamber; 33, honeycomb pipe; 34, porous foam; 35, spoiler; 36, deflector;

[0033] 4, delivery component; 41, delivery pipeline; 42, first air pump; 43, output pipe; 44, exhaust pipe; 45, first electromagnetic valve; 46, sensor; 47, second electromagnetic valve; 48, second air pump. DETAILED DESCRIPTION

[0034] The technical solutions in the embodiments of the present application will be described clearly and completely below with reference to the accompanying drawings in the embodiments of the present application. Obviously, the described embodiments are only part of the embodiments of the present application, rather than all the embodiments of the present application. Based on the embodiments in the present application, all the other embodiments obtained by those of ordinary skill in the art without creative work fall within the protection scope of the present application.

[0035] In the description of the present application, it should be understood that the terms "center", "longitudinal", "transverse", "length", "width", "thickness", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "clockwise", "counterclockwise" and the like indicate the orientation or positional relationship based on the orientation or positional relationship shown in the drawings, which are only for the convenience of describing the present application and simplifying the description, and do not indicate or imply that the devices or elements referred to must have a particular orientation, be constructed and operated in a particular orientation, and therefore cannot be understood as limiting the present application.

[0036] Embodiment 1

[0037] First, please refer to Figure 1 and Figure 3 , the purpose of the present embodiment is to provide a portable combustible gas alarm detector device, which comprises a shell 1, a quantitative assembly 2 for quantifying gas is arranged inside the shell 1, the quantitative assembly 2 comprises a mass flow controller 21 fixedly arranged inside the shell 1, the mass flow controller 21 is a kind of automatic device that can accurately measure and control the flow of gas or liquid, the core function is to monitor the mass flow of fluid in real time, and the flow is stabilized at the set value through closed-loop control, and it can be wirelessly connected with external electronic equipment and wirelessly controlled, as prior art, the working principle and function of the present scheme will not be described again;

[0038] Specifically, please refer to Figures 2-3 , the inlet end of the mass flow controller 21 is fixedly connected with an air input pipe 22 and a to-be-tested gas delivery pipe 23, the air input pipe 22 and the to-be-tested gas delivery pipe 23 are respectively used to introduce air and to-be-tested gas into the inside of the mass flow controller 21, and the gas inlet ends of the air input pipe 22 and the to-be-tested gas delivery pipe 23 are arranged on the outside of the shell 1, when using the device, the gas inlet end of the to-be-tested gas delivery pipe 23 is connected with the corresponding micro gas cylinder, and the gas inlet end of the air input pipe 22 is opened, to input air and to-be-tested gas into the inside of the device for mixing;

[0039] In order to facilitate the control of the flow rate and pressure of the gas entering the mass flow controller 21, and prevent the pressure of the gas entering the mass flow controller 21 from being too high to cause too much input gas or damage to it, please refer to Figures 3-4As shown, the air input pipe 22 and the to-be-tested gas delivery pipe 23 are respectively fixedly provided with a sampling pump 24 and a pressure reducing valve 25, and the sampling pump 24 and the pressure reducing valve 25 are arranged in the interior of the shell 1, the sampling pump 24 and the pressure reducing valve 25 can be wirelessly connected with external equipment, the sampling pump 24 is used for pumping external air into the interior of the mass flow controller 21, and the power thereof can be adjusted at the start to control the flow rate of the air, the pressure reducing valve 25 is used for reducing the high-pressure fluid gas in the micro gas cylinder to the required low pressure subsequently, and maintaining the subsequent pressure stable when the inlet pressure or flow rate fluctuates, when the air and the to-be-tested gas are input into the mass flow controller 21, the flow rate and the pressure of the air and the to-be-tested gas when entering the mass flow controller 21 are adjusted by wirelessly controlling the sampling pump 24 and the pressure reducing valve 25 respectively, so that the mass flow controller 21 is prevented from being damaged due to the flow rate and pressure fluctuation of the gas when entering the mass flow controller 21;

[0040] Secondly, in order to ensure that the concentration of the to-be-tested gas can be accurately controlled, after the gas enters the interior of the mass flow controller 21, the mass and flow rate of the air and the to-be-tested gas are adjusted by wireless operation, and the adjusted to-be-tested gas is accurately output, so that the subsequent mixing and detection processes can be normally carried out;

[0041] In order to mix the gas output from the mass flow controller 21 uniformly and ensure the subsequent detection precision, please refer to Figures 3-8 As shown, the quantitative assembly 2 is provided with a mixing assembly 3 for mixing the gas on one side, the mixing assembly 3 is arranged in the interior of the shell 1, the mixing assembly 3 comprises a mixing cavity 32, one end of the mixing cavity 32 is fixedly connected with a premixing pipe 31, the other end of the premixing pipe 31 is fixedly connected with the outlet end of the mass flow controller 21, the premixing pipe 31 is used for delivering and premixing the gas output from the mass flow controller 21, a plurality of spoiler plates 35 are non-uniformly fixedly arranged in the interior of the premixing pipe 31, the spoiler plates 35 are used for disturbing the flow direction of the gas in the interior of the premixing pipe 31 and guiding the preliminary mixing, on the one hand, the gas continuously changes the flow path under the disturbance of the spoiler plates 35 arranged non-uniformly when passing through the premixing pipe 31, and continuously collides with other gas molecules and preliminarily mixes in the process of changing the path, effectively breaking the flow rate difference between the center and the edge at the outlet, and laying a foundation for the subsequent uniform mixing;

[0042] Further, the two ends of the mixing cavity 32 are tapered, and a plurality of flow guides 36 are fixed in the tapered structure of the mixing cavity 32 near the premixing pipeline 31 from inside to outside layer by layer. The flow guides 36 are used to guide the dispersion of the gas flow. After the gas at the outlet end of the premixing pipeline 31 enters the inside of the mixing cavity 32, it is first uniformly dispersed under the guidance of each flow guide 36 and smoothly guided to the middle position of the mixing cavity 32, which significantly enhances the uniformity of the gas flow. On the other hand, the flow guide 36 and the spoiler 35 combine to complete the flow field optimization of “breaking and then standing”. The uniform concentration created by the spoiler 35 avoids the dispersion failure of the flow guide 36 due to uneven incoming flow composition. The uniform flow condition provided by the flow guide 36 ensures that the subsequent mixing can be carried out in the most ideal state, realizing seamless connection in function and qualitative improvement in flow field. This “premixing and then uniform flow” step-by-step processing makes the gas reach a high degree of uniformity in concentration and flow rate before entering the main body of the mixing cavity 32 for final diffusion and fusion, which greatly shortens the time and distance required for complete mixing at the molecular level in the mixing cavity 32.

[0043] In order to enable the gas to be fully mixed inside the mixing cavity 32, please refer to Figures 6-7 As shown, the mixing cavity 32 is sequentially fixed with a honeycomb tube 33 and a porous foam 34 for dividing and mixing the gas, and the flow guide 36 is embedded in the inside of the honeycomb tube 33 near one end of the honeycomb tube 33. Under the guidance of each flow guide 36, the gas smoothly enters the inside of the honeycomb tube 33. The inside of the honeycomb tube 33 is a large number of parallel flow channels. On the one hand, the honeycomb tube 33 “divides” the originally concentrated large flow into a large number of parallel fine flow, significantly improving the regularity and controllability of the flow, and uniformly guiding the gas into the inside of the porous foam 34. The pore diameter of the honeycomb tube 33 and the pore diameter of the porous foam 34 are staggered and communicated, and the pore size of the honeycomb tube 33 is larger than the pore size of the porous foam 34. That is to say, at the connection between the outlet end of the honeycomb tube 33 and the inlet end of the porous foam 34, each gas outlet of the honeycomb tube 33 is connected with a plurality of adjacent gas inlets of the porous foam 34, and the gas flows out of the honeycomb tube 33 and disperses into the gas inlets of the plurality of porous foams 34;

[0044] Subsequently, the porous foam 34 provides a huge specific surface area and a complex interlaced flow channel in a very compact physical space, and its mixing efficiency is much higher than that of a traditional cavity design. When the gas passes through numerous randomly distributed, tortuous and tiny pores, it is continuously divided, combined and redirected, which greatly enhances the contact opportunities and diffusion efficiency between gas molecules at the microscopic level, so that even a very small concentration difference is completely eliminated, and finally a highly uniform mixed gas at the molecular level is output, and the dead volume of the mixing system is eliminated. On the other hand, the outlet end of the honeycomb tube 33 and the inlet end of the porous foam 34 form a large hole-small hole misalignment connection, so that the gas generates a natural diffusion effect at the interface, and the flow rate is secondarily adjusted through the sudden change of the flow area section, effectively avoiding the local pressure loss caused by the straight rush of the gas flow. Secondly, when the gas flows out of the larger pore flow channel of the honeycomb tube 33, it is forced to disperse into multiple adjacent porous foams 34 with smaller pore inlets. This process not only realizes the secondary subdivision of the flow beam, but also forms a natural transition from turbulent flow to laminar flow at the interface, significantly enhancing the mutual penetration between gas clusters. Finally, this structure enables the gas to be fully pre-dispersed when entering the porous foam 34, laying an ideal foundation for subsequent deep mixing in the porous medium, and overall realizing a step-by-step optimization from macroscopic flow beam to microscopic flow, which not only guarantees the stability of the flow, but also greatly improves the mixing uniformity of the gas flow;

[0045] In addition, in order to avoid the gas flowing out of the gap in the mixing cavity 32 without passing through the honeycomb tube 33 and the porous foam 34, resulting in the inability to mix uniformly, the honeycomb tube 33 and the porous foam 34 are tightly attached to the inner wall of the mixing cavity 32, and the porous foam 34 is attached to the honeycomb tube 33. The gas inside the mixing cavity 32 must flow out after passing through the honeycomb tube 33 and the porous foam 34 to ensure that the gas passing through the mixing cavity 32 can be fully mixed, thereby ensuring the accuracy of the subsequent detection results.

[0046] Further, as shown in Figure 5 and Figure 9 , the mixing assembly 3 is provided with a conveying assembly 4 away from the quantitative assembly 2. The conveying assembly 4 is arranged inside the shell 1. In order to provide a buffer space for gas conveying and ensure the stability of subsequent gas conveying, the conical structure at one end of the mixing cavity 32 close to the conveying assembly 4 is hollow, used for temporarily storing the mixed gas;

[0047] Specifically, the conveying assembly 4 includes a conveying pipe 41 fixedly connected to a conical cavity at one end of the mixing chamber 32, and a first air pump 42 for pumping gas is fixedly installed on the conveying pipe 41. When the first air pump 42 is started, it pumps the gas that has been mixed inside the cavity of the mixing chamber 32 backward. An output pipe 43 and an exhaust pipe 44 are fixedly connected to the end of the conveying pipe 41 away from the mixing chamber 32, respectively. The output pipe 43 and the exhaust pipe 44 are used to convey the gas to be tested to the outside and to vent the gas inside the device, respectively. The outlet ends of the output pipe 43 and the exhaust pipe 44 are both located on the outside of the housing 1. By connecting the outlet end of the output pipe 43 to the alarm to be tested and the outlet end of the exhaust pipe 44 to the recovery device, the subsequent detection and gas recovery work is completed.

[0048] Secondly, to facilitate control of gas outflow and verification of the accuracy of test results, please refer to [link / reference needed]. Figure 9 As shown, a solenoid valve 45 and a sensor 46 are fixedly installed on the output pipe 43. They are used to control the gas discharge from the output pipe 43 and detect the gas concentration inside the output pipe 43, respectively. The sensor 46 can be connected to an external wireless device. By opening the solenoid valve 45, the gas inside the delivery pipe 41 is discharged and delivered to the alarm to be tested. The sensor 46 simultaneously detects the gas concentration inside the output pipe 43 and transmits the result to the external wireless device to calibrate and judge the alarm detection result.

[0049] To prevent residual gas inside the device from contaminating the device or affecting the smooth progress of the next test after the test is completed, a second solenoid valve 47 and a second air pump 48 are fixedly installed on the exhaust pipe 44 from the inside to the outside. They are used to control the discharge of gas inside the exhaust pipe 44 and to pump the gas inside the exhaust pipe 44 outward, respectively. After the test is completed, the first solenoid valve 45 is closed and the second solenoid valve 47 is opened. Then, the second air pump 48 is started to extract the remaining mixed gas inside the conveying pipeline 41. The remaining mixed gas inside the device is gradually extracted to the external recovery device along the conveying and mixing channels to ensure that there is no residual mixed gas inside the device that will affect the normal use of the device in the future.

[0050] Therefore, based on the above, the working principle of this invention can be summarized as follows:

[0051] First, air and the gas to be tested are respectively delivered to the mass flow controller 21 through the air input pipe 22 and the gas delivery pipe 23 for quantitative mixing. The quantitatively measured gas is then delivered to the mixing chamber 32 through the premixing pipe 31 for mixing. The premixing pipe 31 premixes the gas while delivering it, laying the foundation for subsequent uniform mixing. The gas flowing into the mixing chamber 32 is guided by the guide plates 36 and evenly enters the honeycomb tube 33 and the porous foam 34 for thorough mixing. The mixed gas is then output to the alarm to be tested through the delivery pipe 41 and the output pipe 43. The sensor 46 synchronously detects the gas inside the output pipe 43 to calibrate and determine the alarm detection results. Finally, the gas inside the device is extracted to the recovery device by the second air pump 48 to prevent residual gas inside the device from affecting the normal operation of the device.

[0052] The foregoing has shown and described the basic principles, main features, and advantages of the present invention. Those skilled in the art should understand that the present invention is not limited to the above embodiments. The embodiments and descriptions in the specification are merely preferred examples and are not intended to limit the invention. Various changes and modifications can be made to the invention without departing from its spirit and scope, and all such changes and modifications fall within the scope of the present invention as claimed. The scope of protection of the present invention is defined by the appended claims and their equivalents.

Claims

1. A portable combustible gas alarm calibration device, comprising a housing (1), wherein a metering component (2) for metering gas is disposed inside the housing (1), the metering component (2) comprising a mass flow controller (21) fixedly disposed inside the housing (1), characterized in that: The housing (1) is also provided with a mixing component (3), which includes a mixing chamber (32) and the two ends of the mixing chamber (32) are conical. Multiple guide plates (36) are fixedly arranged in the conical structure inside the mixing chamber (32) from the inside to the outside. The mixing chamber (32) is sequentially fixed with a honeycomb tube (33) and a porous foam (34) for separating and mixing the gas; the honeycomb tube (33) and the porous foam (34) are both tightly attached to the inner wall of the mixing chamber (32), and the porous foam (34) and the honeycomb tube (33) are attached to each other; The pore sizes of the honeycomb tube (33) and the porous foam (34) are arranged in an alternating manner, and the pore size of the honeycomb tube (33) is larger than that of the porous foam (34).

2. The portable combustible gas alarm calibration device according to claim 1, characterized in that: The mixing chamber (32) is fixedly connected to a premixed pipe (31) at one end near the guide plate (36), and the other end of the premixed pipe (31) is fixedly connected to the outlet end of the mass flow controller (21). The guide plate (36) is embedded in the interior of the honeycomb tube (33) at one end near the honeycomb tube (33).

3. The portable combustible gas alarm calibration device according to claim 2, characterized in that: The premixed pipe (31) is unevenly fixed with several baffles (35) inside. The baffles (35) are used to disrupt the gas flow direction inside the premixed pipe (31) and guide it to mix initially.

4. The portable combustible gas alarm calibration device according to claim 1, characterized in that: The inlet end of the mass flow controller (21) is fixedly connected to an air input pipe (22) and a gas delivery pipe (23) to be tested. The air input pipe (22) and the gas delivery pipe (23) to be tested are respectively used to introduce air and gas to be tested into the interior of the mass flow controller (21). The air inlet of the air inlet pipe (22) and the gas delivery pipe (23) to be tested is located on the outside of the housing (1).

5. The portable combustible gas alarm calibration device according to claim 4, characterized in that: A sampling pump (24) and a pressure reducing valve (25) are fixedly installed on the air input pipe (22) and the gas delivery pipe (23) to be tested, respectively, and the sampling pump (24) and the pressure reducing valve (25) are both located inside the housing (1).

6. The portable combustible gas alarm calibration device according to claim 1, characterized in that: The mixing component (3) is provided with a conveying component (4) on the side away from the metering component (2), and the conveying component (4) is disposed inside the housing (1); The conical structure of the mixing chamber (32) near the end of the conveying assembly (4) is hollow inside, which is used to temporarily store the mixed gas.

7. The portable combustible gas alarm calibration device according to claim 6, characterized in that: The conveying assembly (4) includes a conveying pipe (41) fixedly connected to a conical cavity at one end of the mixing chamber (32), and a No. 1 air pump (42) for pumping gas is fixedly installed on the conveying pipe (41).

8. The portable combustible gas alarm calibration device according to claim 7, characterized in that: The end of the conveying pipe (41) away from the mixing chamber (32) is fixedly connected to the output pipe (43) and the exhaust pipe (44). The output pipe (43) and the exhaust pipe (44) are used to deliver the gas to be tested to the outside and to vent the gas inside the device, respectively, and the outlet ends of the output pipe (43) and the exhaust pipe (44) are both located on the outside of the housing (1).

9. The portable combustible gas alarm calibration device according to claim 8, characterized in that: A solenoid valve (45) and a sensor (46) are fixedly installed on the output pipe (43), which are used to control the gas discharge of the output pipe (43) and detect the gas concentration inside the output pipe (43), respectively.

10. The portable combustible gas alarm calibration device according to claim 8, characterized in that: The exhaust pipe (44) is fixedly equipped with a second solenoid valve (47) and a second air pump (48) from the inside to the outside, respectively, for controlling the discharge of gas inside the exhaust pipe (44) and pumping gas out of the exhaust pipe (44).

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