Portable combustible gas alarm calibrating device

Abstract

The invention relates to the technical field of alarm verification, in particular to a portable combustible gas alarm verification device. The gas mixing device comprises a mixing assembly, the mixing assembly comprises a mixing cavity, the two ends of the mixing cavity are in a closed conical shape, and a honeycomb-shaped pipe and porous foam are sequentially and fixedly arranged in the mixing cavity and used for dividing gas and mixing the gas. According to the invention, a gas flow beam after preliminary mixing is divided into a large number of regular micro flow beams through the honeycomb-shaped pipe, and the porous foam is used for carrying out micro-level efficient division, shearing and recombination on gas in an extremely compact space by utilizing the huge specific surface area and complex micro-pore channels of the porous foam; due to the synergistic effect, gas molecules are fully diffused and mixed within an extremely short path and time, the technical defect that a traditional design depends on increasing the flow speed or increasing the mixing volume is overcome, and unification of high-precision mixing, quick response and low consumption is achieved.

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. 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 proposes a portable combustible gas alarm verification device. SUMMARY

[0005] The present application aims to provide a portable combustible gas alarm detector calibration device to solve the above problems in the background art that the existing calibration device is prone to concentration fluctuation due to uneven gas mixing, and the traditional improvement method of blindly increasing flow rate or increasing mixing volume makes it difficult to balance between precision and efficiency.

[0006] To solve the above problems, a portable combustible gas alarm detector calibration device is provided, comprising a shell, a quantitative assembly for quantifying gas is arranged inside the shell, the quantitative assembly comprises a mass flow controller fixedly arranged inside the shell, a mixing assembly is also arranged inside the shell, the mixing assembly comprises a mixing chamber, and the two ends of the mixing chamber are in the shape of a conical taper; A honeycomb tube and a porous foam are fixedly arranged in the mixing chamber in sequence for dividing and mixing the gas; The honeycomb tube and the porous foam are tightly attached to the inner wall of the mixing chamber, and the porous foam is attached to the honeycomb tube; The pore size of the honeycomb tube and the pore size of the porous foam are staggered and connected, and the pore size of the honeycomb tube is larger than the pore size of the porous foam; A plurality of flow guides are fixedly arranged in the conical structure inside the mixing chamber layer by layer from the inside to the outside, and the flow guides are used to guide the dispersed flow of the gas.

[0007] The inside of the honeycomb tube is a large number of parallel flow channels, the honeycomb tube "divides" the originally concentrated large flow into a large number of parallel fine flow, significantly improves the regularity and controllability of the flow, and uniformly guides the gas into the inside of the porous foam, then the porous foam provides a large 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 the traditional cavity design, when the gas passes through countless randomly distributed, tortuous and tiny pores, it is continuously divided, combined and redirected, which greatly enhances the contact opportunity and diffusion efficiency between gas molecules at the micro level, so that even very small concentration differences are 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.

[0008] As a further improvement of the present technical solution, a premixing pipe is fixedly connected to one end of the mixing chamber close to the flow guides, and the other end of the premixing pipe is fixedly connected to the outlet end of the mass flow controller; One end of the flow guide close to the honeycomb tube is embedded in the inside of the honeycomb tube.

[0009] After the gas at the outlet end of the premixing pipe enters the inside of the mixing chamber, it is first uniformly dispersed under the guidance of each flow guide and smoothly guided to the middle position of the mixing chamber, significantly enhancing the uniformity of the gas flow.

[0010] As a further improvement to this technical solution, several baffles are unevenly fixed inside the premixed pipe. The baffles are used to disrupt the gas flow direction inside the premixed pipe and guide its initial mixing.

[0011] As the gas passes through the premixing pipe, its flow path is constantly altered by the unevenly arranged baffles. During this process, the gas continuously collides with other gas molecules and undergoes initial mixing, effectively breaking down the velocity difference between the center and the edge of the outlet and laying the foundation for subsequent uniform mixing.

[0012] Compared with the prior art, the beneficial effects of the present invention are as follows: 1. In this portable combustible gas alarm calibration device, after the gas is output from the mass flow controller, it passes through a premixing pipe with an internal baffle and a guide plate at the inlet of the mixing chamber. This effectively breaks the stratification of different gas flows from the mass flow controller outlet due to inertia differences, preventing the high-speed portion from entering the mixing zone prematurely while the low-speed portion remains inside the flow channel, thus creating instantaneous concentration fluctuations. This suppresses the generation of "concentration stripes" or "component pulses" and solves the problem of initial mixing disturbance caused by uneven airflow distribution in traditional devices. It lays a stable and uniform flow field foundation for subsequent molecular-level uniform mixing.

[0013] 2. In this portable combustible gas alarm calibration device, after the gas enters the middle position of the mixing chamber through the guide plate, the honeycomb tube divides the initially mixed gas stream into a large number of regular micro-streams. Meanwhile, the porous foam, in an extremely compact space, utilizes its huge specific surface area and intricate microporous channels to efficiently divide, shear, and recombine the gas at the microscopic level. This synergistic effect enables gas molecules to achieve full diffusion and mixing in a very short path and time, ultimately outputting a gas with a highly uniform concentration. This structure fundamentally overcomes the technical drawbacks of traditional designs that rely on increasing the flow rate (causing pressure fluctuations) or increasing the mixing volume (leading to response lag and gas waste), achieving a balance between high-precision mixing, rapid response, and low consumption. Attached Figure Description

[0014] Figure 1 This is a schematic diagram of the overall structure of the present invention; Figure 2 This is a rear view of the overall structure of the present invention; Figure 3 This is a cross-sectional view of the shell structure of the present invention; Figure 4 This is a schematic diagram of the quantitative component structure of the present invention; Figure 5 This is a schematic diagram of the quantitative component, mixing component, and conveying component of the present invention; Figure 6This is a cross-sectional view of the premixed pipe and mixing chamber structure of the present invention; Figure 7 This is a cross-sectional view of the mixing cavity structure of the present invention; Figure 8 This is a top view of the guide vane structure of the present invention; Figure 9 This is a schematic diagram of the conveying component structure of the present invention.

[0015] The meanings of the labels in the diagram are as follows: 1. Housing; 2. Metering component; 21. Mass flow controller; 22. Air inlet pipe; 23. Gas delivery pipe; 24. Sampling pump; 25. Pressure reducing valve; 3. Mixing components; 31. Premixed pipes; 32. Mixing chamber; 33. Honeycomb tubes; 34. Porous foam; 35. Baffles; 36. Guide vanes; 4. Conveying assembly; 41. Conveying pipeline; 42. Air pump No. 1; 43. Output pipe; 44. Exhaust pipe; 45. Solenoid valve No. 1; 46. Sensor; 47. Solenoid valve No. 2; 48. Air pump No. 2. Detailed Implementation

[0016] The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0017] In the description of this invention, it should be understood that the terms "center," "longitudinal," "lateral," "length," "width," "thickness," "upper," "lower," "front," "rear," "left," "right," "vertical," "horizontal," "top," "bottom," "inner," "outer," "clockwise," and "counterclockwise," etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are only for the convenience of describing this invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this invention.

[0018] Example 1 First, please refer to Figure 1 and Figure 3As shown, the purpose of this embodiment is to provide a portable combustible gas alarm calibration device, including a housing 1. The housing 1 is provided with a metering component 2 for metering gas. The metering component 2 includes a mass flow controller 21 fixedly installed inside the housing 1. The mass flow controller 21, i.e., MFC, is an automated device that can accurately measure and control the flow of gas or liquid. Its core function is to monitor the fluid mass flow in real time and stabilize the flow at a set value through closed-loop control. It can also be wirelessly connected to and wirelessly controlled by external electronic devices. As it is prior art, the working principle and function of this solution will not be described in detail here. For details, please refer to Figures 2-3 As shown, 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 used to introduce air and the gas to be tested into the interior of the mass flow controller 21, respectively. The air inlet ends of the air input pipe 22 and the gas delivery pipe 23 to be tested are located on the outside of the housing 1. When using the device, by connecting the air inlet end of the gas delivery pipe 23 to the corresponding miniature gas cylinder and opening the air inlet end of the air input pipe 22, air and the gas to be tested are introduced into the interior of the device for mixing. To facilitate control of the flow rate and pressure of gas entering the mass flow controller 21, and to prevent excessive pressure from causing too much input gas or damage to the controller 21, please refer to [link to relevant documentation]. Figures 3-4 As shown, a sampling pump 24 and a pressure reducing valve 25 are fixedly installed on the air input pipe 22 and the gas to be tested delivery pipe 23, respectively. Both the sampling pump 24 and the pressure reducing valve 25 are located inside the housing 1. Both the sampling pump 24 and the pressure reducing valve 25 can be wirelessly connected to external devices. The sampling pump 24 is used to pump outside air into the mass flow controller 21. Its power can be adjusted to control the air flow rate when it is started. The pressure reducing valve 25 is used to reduce the high-pressure fluid gas in the micro gas cylinder to the required low pressure and maintain the subsequent pressure stability when its inlet pressure or flow rate fluctuates. When air and gas to be tested are input into the mass flow controller 21, the flow rate and pressure of the air and gas to be tested are adjusted by wirelessly controlling the sampling pump 24 and the pressure reducing valve 25, respectively, to prevent the mass flow controller 21 from being damaged due to fluctuations in the flow rate and pressure of the gas when it enters the mass flow controller 21. Secondly, in order to ensure that the concentration of the gas to be tested can be accurately controlled, after the gas enters the mass flow controller 21, the mass and flow rate of the air and the gas to be tested are adjusted wirelessly, and the adjusted gas to be tested is accurately output, so as to facilitate the normal operation of subsequent mixing and testing processes. To ensure uniform mixing of the output from mass flow controller 21 and guarantee the accuracy of subsequent detection, please refer to [link / reference needed]. Figures 3-8As shown, a mixing component 3 for mixing gas is provided on one side of the quantitative component 2. The mixing component 3 is located inside the housing 1. The mixing component 3 includes a mixing chamber 32. One end of the mixing chamber 32 is fixedly connected to a premixing pipe 31. The other end of the premixing pipe 31 is fixedly connected to the outlet end of the mass flow controller 21. The premixing pipe 31 is used to transport and premix the gas output from the mass flow controller 21. Several baffles 35 are uniformly fixedly arranged inside the premixing pipe 31. The baffles 35 are used to disrupt the gas flow direction inside the premixing pipe 31 and guide it to mix initially. On the one hand, when the gas passes through the premixing pipe 31, it continuously changes its flow path under the interference of the unevenly arranged baffles 35. In the process of changing the path, it continuously collides with other gas molecules and mixes initially, effectively breaking the velocity difference between the center and the edge at the outlet, laying the foundation for subsequent uniform mixing. Furthermore, the mixing chamber 32 has conical ends that taper towards the top. Within the conical structure of the mixing chamber 32 near the premixing pipe 31, multiple guide plates 36 are fixedly arranged layer by layer from the inside out. These guide plates 36 guide the dispersed flow of gas. After the gas from the outlet of the premixing pipe 31 enters the mixing chamber 32, it is first uniformly dispersed under the guidance of the guide plates 36 and then smoothly guided to the center of the mixing chamber 32, significantly enhancing the uniformity of gas flow. On the other hand, the combination of the baffle plate 35 and the guide plates 36 completes a "destructive" optimization of the flow field, preventing further disruption. The uniform concentration base created by the flow plate 35 avoids the dispersion failure caused by the uneven composition of the incoming flow in the guide plate 36; the uniform flow conditions provided by the guide plate 36 ensure that subsequent mixing can be carried out under the most ideal conditions, achieving seamless functional connection and qualitative improvement of the flow field. This step-by-step treatment of "premixing first and then uniform flow" ensures that the gas has achieved a high degree of uniformity in concentration and flow rate before entering the main body of the mixing chamber 32 for final diffusion and fusion. This greatly shortens the time and distance required to achieve complete molecular-level mixing in the mixing chamber 32.

[0019] To ensure thorough mixing of the gases within mixing chamber 32, please refer to [link / reference]. Figures 6-7As shown, honeycomb tubes 33 and porous foam 34 are sequentially fixed inside the mixing chamber 32 to separate and mix the gas. One end of a guide plate 36 near the honeycomb tube 33 is embedded inside the honeycomb tube 33. Guided by the guide plates 36, the gas smoothly enters the honeycomb tube 33. The honeycomb tube 33 contains numerous parallel flow channels. On one hand, the honeycomb tube 33 "segments" the originally concentrated large flow stream into numerous parallel micro-flow streams, significantly improving the regularity of the flow. With controllability, and uniformly guide the gas into the interior of the porous foam 34, the pore diameters of the honeycomb tube 33 and the porous foam 34 are staggered and connected, and the pore size of the honeycomb tube 33 is larger than that 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 air outlet of the honeycomb tube 33 is connected to multiple adjacent air inlets of the porous foam 34. When the gas flows out from the honeycomb tube 33, it is dispersed and flows into multiple air inlets of the porous foam 34. Subsequently, the porous foam 34 provides a huge specific surface area and complex interlaced flow channels within an extremely compact physical space. 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, completely eliminating even extremely small concentration differences. The final output is a highly uniform mixed gas at the molecular level, eliminating the dead volume of the mixing system. On the other hand, the outlet end of the honeycomb tube 33 and the inlet end of the porous foam 34 form a staggered connection of large pores to small pores, causing a natural diffusion effect at the interface. The abrupt change in the flow channel cross-section achieves secondary regulation of the flow velocity, effectively avoiding local pressure loss caused by direct airflow. Secondly, when the gas flows out from the larger diameter flow channel of the honeycomb tube 33, it is forcibly dispersed into multiple adjacent smaller diameter inlets of the porous foam 34. This process not only achieves secondary subdivision of the flow stream but also forms a natural transition from turbulent to laminar flow at the interface, significantly enhancing the mutual penetration between gas micro-clusters. Ultimately, this structure ensures that the gas is fully pre-dispersed when it enters the porous foam 34, laying an ideal foundation for subsequent deep mixing in the porous medium. Overall, it achieves a step-by-step optimization from macroscopic flow to microscopic flow, which not only ensures flow stability but also greatly improves the mixing uniformity of the airflow. Furthermore, to prevent gas from flowing out of the gaps inside the mixing chamber 32 without passing through the honeycomb tube 33 and porous foam 34, thus preventing it from being mixed evenly, both the honeycomb tube 33 and the porous foam 34 are tightly fitted to the inner wall of the mixing chamber 32, and the porous foam 34 is also tightly fitted to the honeycomb tube 33. The gas inside the mixing chamber 32 must flow out after passing through the honeycomb tube 33 and porous foam 34 to ensure that the gas passing through the mixing chamber 32 can be fully mixed, thereby ensuring the accuracy of subsequent test results.

[0020] For further details, please refer to Figure 5 and Figure 9 As shown, a conveying component 4 is provided on the side of the mixing component 3 away from the metering component 2. The conveying component 4 is located inside the housing 1. In order to provide a buffer space for gas delivery and ensure the stability of subsequent gas delivery, the cone-shaped structure of the mixing chamber 32 near the conveying component 4 is hollow inside, which is used to temporarily store the mixed gas. 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.

[0021] 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. 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.

[0022] Therefore, based on the above, the working principle of this invention can be summarized as follows: 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.

[0023] 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 calibrating device, comprising a housing (1), a dosing assembly (2) for dosing gas is arranged inside the housing (1), the dosing assembly (2) comprises a mass flow controller (21) fixedly arranged inside the housing (1), characterized in that: a mixing assembly (3) is further arranged inside the housing (1), the mixing assembly (3) comprises a mixing cavity (32), and the mixing cavity (32) is in a conical shape at both ends, a plurality of guide plates (36) are fixedly arranged in the conical structure inside the mixing cavity (32) layer by layer from inside to outside; a honeycomb tube (33) and a porous foam (34) are fixedly arranged in the mixing cavity (32) in sequence for dividing and mixing the gas; 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 pore diameter of the honeycomb tube (33) and the pore diameter of the porous foam (34) are arranged in staggered communication, and the pore diameter size of the honeycomb tube (33) is larger than the pore diameter size of the porous foam (34). the mixing cavity (32) is fixedly connected with a premixing pipeline (31) at one end close to the guide plate (36), and the other end of the premixing pipeline (31) is fixedly connected with the outlet end of the mass flow controller (21); 2. The portable combustible gas alarm verificatio n device of claim 1, wherein: the guide plate (36) is embedded in the inside of the honeycomb tube (33) at one end close to the honeycomb tube (33). a plurality of spoiler plates (35) are fixedly arranged in the premixing pipeline (31) non-uniformly, and the spoiler plates (35) are used for disturbing the flow direction of the gas in the premixing pipeline (31) and guiding the preliminary mixing thereof.

3. The portable combustible gas alarm verificatio n device of claim 2, wherein: the inlet end of the mass flow controller (21) is fixedly connected with an air input pipe (22) and a gas to be detected delivery pipe (23), the air input pipe (22) and the gas to be detected delivery pipe (23) are respectively used for introducing air and gas to be detected into the inside of the mass flow controller (21); 4. The portable combustible gas alarm calibrating device of claim 1, wherein: and the air inlet end of the air input pipe (22) and the gas to be detected delivery pipe (23) is arranged on the outside of the housing (1). a sampling pump (24) and a pressure reducing valve (25) are fixedly arranged on the air input pipe (22) and the gas to be detected delivery pipe (23) respectively, and the sampling pump (24) and the pressure reducing valve (25) are arranged inside the housing (1).

5. The portable combustible gas alarm calibrating device of claim 4, wherein: a delivery assembly (4) is arranged on the side of the mixing assembly (3) away from the dosing assembly (2), and the delivery assembly (4) is arranged inside the housing (1); 6. The portable combustible gas alarm calibrating device of claim 1, wherein: the conical structure inside the mixing cavity (32) at one end close to the delivery assembly (4) is a cavity for temporarily storing the mixed gas. the delivery assembly (4) comprises a delivery pipeline (41) fixedly connected with the conical cavity at one end of the mixing cavity (32), and a first air pump (42) for pumping gas is fixedly arranged on the delivery pipeline (41).

7. The portable combustible gas alarm calibrating device of claim 6, wherein: the delivery pipeline (41) is fixedly connected with an output pipe (43) and an exhaust pipe (44) at one end away from the mixing cavity (32); respectively.

8. The portable combustible gas alarm calibrating device of claim 7, wherein: ​ The output pipe (43) and the exhaust pipe (44) are respectively used for conveying the to-be-detected gas and the internal gas of the emptying device to the outside, and the gas outlet ends of the output pipe (43) and the exhaust pipe (44) are arranged on the outside of the shell (1).

9. The portable combustible gas alarm calibrating device of claim 8, wherein: A first electromagnetic valve (45) and a sensor (46) are fixedly arranged on the output pipe (43) and are respectively used for controlling the gas discharge of the output pipe (43) and detecting the gas concentration in the output pipe (43).

10. The portable combustible gas alarm calibrating device of claim 8, wherein: A second electromagnetic valve (47) and a second gas pump (48) are fixedly arranged on the exhaust pipe (44) from inside to outside and are respectively used for controlling the gas discharge of the exhaust pipe (44) and externally pumping the internal gas of the exhaust pipe (44).

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