Pyroelectric ion particle size measuring device and measuring method

Abstract

The invention provides a pyroelectric ion particle size measuring device and method, and relates to the technical field of particle size measurement, the pyroelectric ion particle size measuring device comprises a heating assembly, a filtering assembly and a detection assembly, the heating assembly comprises a heating container and a heater, and the heater is arranged in the heating container; the filtering assembly comprises a filtering container and a first filtering piece, the filtering container is communicated with the interior of the heating container, the first filtering piece is arranged in the filtering cavity, and the first filtering piece is provided with first filtering holes; the detection assembly comprises a collection container and a detector, and the collection container is communicated with the filtering chamber; and the detector is used for detecting the pyroelectric ions in the collection container. The heater is used for heating the combustible material to generate the heat release ions, whether the heat release ions can penetrate through the first filtering holes of the first filtering piece or not is measured in the mode that whether the detector detects that the heat release ions exist in the collecting cavity or not, and the particle size of the heat release ions can be determined according to the hole diameter of the first filtering holes.

Description

Technical Field

[0001] The present application belongs to the technical field of particle size measurement, and more specifically, to a pyrolysis ion particle size measurement device and a measurement method. Background Art

[0002] Pyrolytic ions are microscopic particles released when a substance is subjected to abnormal heat that exceeds its tolerance limit. After being generated, these pyrolytic ions are released into the air through Brownian motion and diffusion, forming a large number of transient particles.

[0003] During the entire process of material combustion, a large amount of pyrolytic ions will be generated before the heated temperature reaches the ignition point. As the temperature rises, the material begins to carbonize and eventually reaches the ignition point and begins to smolder. At this time, smoke particles will appear. Therefore, in the early stage of combustion, by detecting the concentration of pyrolytic ions in the environment, the combustion of the material can be judged. Compared with detecting smoke particles, it can issue an early warning, thereby more effectively eliminating fire hazards.

[0004] At present, the particle size of particulate matter in the air is usually measured by charge migration or electrostatic field distribution, which are costly and unreliable. In addition, since pyrolytic ions are only generated before or during the combustion of a substance, the time they exist in the air is relatively short. Therefore, it is difficult to capture pyrolytic ions in flowing air and measure their particle size. Summary of the invention

[0005] The purpose of the embodiments of the present application is to provide a device and method for measuring the particle size of pyrolytic ions, so as to solve the problem in the prior art that it is difficult to capture pyrolytic ions and measure their particle size.

[0006] To achieve the above objectives, in a first aspect, the present application provides a pyrolysis ion particle size measuring device, comprising:

[0007] A heating assembly, comprising a heating container and a heater, wherein the heating container has a heating chamber, the heater is arranged in the heating chamber, and the heater is used to heat combustibles;

[0008] A filter assembly, comprising a filter container and a first filter element, wherein the filter container has a filter chamber, an input port connected to the filter chamber, and an output port connected to the filter chamber, wherein the input port is connected to the heating chamber; the first filter element is disposed in the filter chamber and located between the input port and the output port, and the first filter element has a first filter pore through which the pyrolytic ions can pass;

[0009] The detection component includes a collection container and a detector. The collection container has a collection chamber and a connection port connected to the collection chamber, and the output port is connected to the collection chamber; the detector is connected to the connection port and is used to detect thermally released ions in the collection chamber.

[0010] In some embodiments of the first aspect, the first filter element is a first filter graphite, and the first filter graphite includes a plurality of graphite particles with a preset particle size, and the plurality of adjacent graphite particles are collectively arranged to form the first filter pore.

[0011] In some embodiments of the first aspect, the preset particle size is 20 nm, and the pore size of the first filter pore is 3.1 nm.

[0012] In some embodiments of the first aspect, the filter assembly also includes a plurality of second filter elements disposed in the filter chamber, the plurality of second filter elements are located on the side of the first filter element facing the output port, and the plurality of second filter elements are stacked and arranged in a direction from the input port toward the output port, the second filter element has a second filter pore, and the pore size of the second filter pore is larger than the pore size of the first filter pore.

[0013] In some embodiments of the first aspect, the plurality of second filter elements include a first filter paper, a second filter graphite, and a third filter paper which are sequentially stacked in a direction from the input port toward the output port.

[0014] In some embodiments of the first aspect, the particle size of the first filter paper is 1 μm, the particle size of the second filter graphite is 1.3 μm, and the particle size of the third filter paper has a pore size of 1 μm.

[0015] In some embodiments of the first aspect, the detection assembly further includes a vacuum pump, which is connected between the connection port and the detector and is used to transport the air in the collection chamber to the detector.

[0016] In a second aspect, the present application provides a method for measuring the particle size of pyrolytic ions, using the pyrolytic ion particle size measuring device as described in the first aspect and any optional embodiment thereof, the method for measuring the particle size of pyrolytic ions comprising:

[0017] heating a combustible material using the heater;

[0018] Turning on the detector to detect whether there are pyrolytic ions in the collection container;

[0019] If the pyrolytic ions are detected, it is determined that the particle size of the pyrolytic ions is smaller than the pore size of the first filtering pore;

[0020] If the pyrolytic ions are not detected, it is determined that the particle size of the pyrolytic ions is greater than or equal to the pore size of the first filtering pore.

[0021] In some embodiments of the second aspect, heating the combustible material using the heater comprises:

[0022] Turning on the heater and gradually increasing the heating temperature of the heater;

[0023] The heater is turned off when the heating temperature approaches the ignition temperature of the combustible.

[0024] In some embodiments of the second aspect, before using the heater to heat the combustible, the method for measuring the particle size of the thermal ions further comprises:

[0025] Allowing the detector to continue operating for a preset time period;

[0026] When the detector does not detect the pyrolytic ions, the heater is used to heat the combustible material.

[0027] The beneficial effects of the pyrolytic ion particle size measurement device and measurement method provided in the present application are: by using a heater to heat the combustible material in the combustion chamber, pyrolytic ions are generated, and the pyrolytic ions enter the collection chamber after being filtered by the filter component along with the air in the heating chamber. When the detector detects the presence of pyrolytic ions in the collection chamber, it indicates that the pyrolytic ions have passed through the filter pores of the first filter element, thereby determining that the particle size of the pyrolytic ions is less than or equal to the first pore size, so as to effectively measure the particle size of the pyrolytic ions, and has the advantages of low cost and reliable measurement results. BRIEF DESCRIPTION OF THE DRAWINGS

[0028] In order to more clearly illustrate the technical solutions in the embodiments of the present application, the drawings required for use in the embodiments or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present application. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative labor.

[0029] Figure 1 This is a schematic diagram of the structure of a thermal ion particle size measuring device in an embodiment of the present application;

[0030] Figure 2 This is a schematic diagram of the structure of the filter assembly in the embodiment of the present application;

[0031] Figure 3 This is a schematic diagram of the microstructure of the first filter graphite in the embodiment of the present application;

[0032] Figure 4Flow chart of the method for measuring the particle size of thermal ions in an embodiment of the present application.

[0033] Among them, the reference numerals in the figure are:

[0034] 100-heating component; 110-heating container; 111-heating chamber; 120-heater; 200-filtering component; 210-filtering container; 211-filtering chamber; 212-input port; 213-output port; 220-first filter graphite; 221-graphite particles; 222-first filter pores; 230-first filter paper; 240-second filter graphite; 250-second filter paper; 300-detection component; 310-collecting container; 311-collecting chamber; 312-connecting port; 313-sealing ring; 320-detector; 330-vacuum pump. DETAILED DESCRIPTION

[0035] In order to make the technical problems, technical solutions and beneficial effects to be solved by the present application more clearly understood, the present application is further described in detail below in conjunction with the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are only used to explain the present application and are not used to limit the present application.

[0036] It should be noted that when an element is referred to as being "fixed to" or "disposed on" another element, it can be directly on the other element or indirectly on the other element. When an element is referred to as being "connected to" another element, it can be directly connected to the other element or indirectly connected to the other element.

[0037] It should be understood that the terms "length", "width", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside", etc., indicating the orientation or position relationship, are based on the orientation or position relationship shown in the drawings, and are only for the convenience of describing the present application and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be understood as a limitation on the present application.

[0038] In addition, the terms "first" and "second" are used for descriptive purposes only and should not be understood as indicating or implying relative importance or implicitly indicating the number of the indicated technical features. Thus, a feature defined as "first" or "second" may explicitly or implicitly include one or more of the features. In the description of this application, the meaning of "plurality" is two or more, unless otherwise clearly and specifically defined.

[0039] First, combining Figure 1-Figure 3As shown, the embodiment of the present application provides a device for measuring the particle size of pyrolysis ions, including a heating component 100, a filtering component 200, and a detecting component 300. The heating component 100 includes a heating container 110 and a heater 120. The heating container 110 has a heating chamber 111. The heater 120 is disposed in the heating chamber 111 and is used to heat combustibles. The filtering component 200 includes a filtering container 210 and a first filtering element. The filtering container 210 has a filtering chamber 211, an input port 212 connected to the filtering chamber 211, and an output port 213 connected to the filtering chamber 211. The input port 212 is connected to the heating chamber 111. The first filtering element is disposed in the filtering chamber 211 and is located between the input port 212 and the output port 213. The first filtering element has a first filtering pore 222 through which pyrolysis ions can pass. The detection assembly 300 includes a collection container 310 and a detector 320. The collection container 310 has a collection chamber 311 and a connection port 312 connected to the collection chamber 311, and the output port 213 is connected to the filter chamber 211; the detector 320 is connected to the connection port 312 and is used to detect the pyrolysis ions in the collection chamber 311.

[0040] Specifically, the heating container 110 is a shell structure with a certain volume, and can be made of metal material or non-metal material. For example, the heating container 110 can be made of high-temperature resistant transparent materials such as heat-resistant glass or quartz glass to facilitate observation of state changes of combustibles during the heating process.

[0041] The heating container 110 can be of any shape and can be adapted to the installation method of the heater 120. The interior of the heating container 110 is hollow to form a heating chamber 111 to accommodate the heater 120 and the combustibles, and has a certain space for the diffusion and movement of the pyrolyzed ions. The heating container 110 should have at least one outlet for connecting the filter container 210. The position of the outlet of the heating container 110 can be adapted to the installation position of the filter container 210. For example, the top side wall of the heating container 110 is convex in the horizontal direction to form a protrusion, and the outlet is set at the bottom surface of the protrusion. The filter assembly 200 can be connected to the lower side of the protrusion and communicate with the interior of the heating chamber 111 through the outlet. In addition, part of the structure of the heating container 110 can be set as a detachable structure. For example, the top of the heating container 110 can be separated from the main body of the heating container 110 so that the heating chamber 111 can be opened, which is convenient for installing and maintaining the heater 120 in the heating chamber 111, and also convenient for putting the combustibles into or out of the heating chamber 111.

[0042] The heater 120 can be a controllable heating device such as electromagnetic heating, resistance heating or flame heating, and its heating power and temperature can be adjusted according to the test requirements to control the heating temperature of the combustible. The heater 120 can be fixed to the bottom of the heating chamber 111, and when in use, the combustible is placed on the top of the heater 120 so that the combustible is evenly heated.

[0043] The filter container 210 is a shell structure with a certain volume, which can also be made of metal or non-metallic materials. The filter container 210 is hollow inside to form a filter chamber 211, providing installation space for the first filter element. The shape and size of the filter container 210 can be designed according to actual needs. For example, the filter container 210 is a funnel-shaped structure and is vertically arranged below the raised portion on one side of the heating box. The upper and lower ends of the filter container 210 are both opened to form an input port 212 at the top of the filter container 210 and an output port 213 at the bottom. The input port 212 of the filter container 210 can be connected to the outlet position of the heating container 110 to connect the filter chamber 211 with the heating chamber 111.

[0044] The first filter element is a filter material filled in the filter chamber 211. The first filter element is located between the input port 212 and the output port 213. The first filter pore 222 is a microporous structure on the first filter element. When the air in the heating chamber 111 enters the filter chamber 211, it will pass through the first filter pore 222 in the first filter element, so as to filter the air by using the first filter pore 222, allowing particles in the air that are smaller than or equal to the pore size of the first filter pore 222 to pass through, and blocking larger particles. The pore size of the first filter pore 222 can be set according to the calculated size of the pyrolytic ions, so as to verify whether the calculated size of the pyrolytic ions is compatible with the pore size of the first filter pore 222 by whether the pyrolytic ions can pass through the first filter pore 222, so that the particle size of the pyrolytic ions can be measured.

[0045] The collecting container 310 is also a shell structure with a certain volume, and the interior of the collecting container 310 is hollow to form a collecting chamber 311. The collecting container 310 can also be made of metal material or non-metal material. For example, the collecting container 310 can be a conical beaker. The collecting container 310 can be arranged on the lower side of the filtering container 210, and the top of the collecting container 310 is open. The bottom of the filtering container 210 is inserted into the top opening of the collecting container 310, so that the output port 213 of the filtering container 210 is connected with the collecting chamber 311, and a sealing ring 313 can be provided at the connection between the filtering container 210 and the collecting container 310 to ensure the airtightness of the connection and prevent air leakage.

[0046] A tubular connection port 312 may be provided on one side of the collection container 310 for connecting a detector 320. The detector 320 is used to detect the concentration of pyrolytic ions in the air. As the concentration of pyrolytic ions increases, the data gradually increases. The detector 320 may be connected to the connection port 312 of the collection container 310 through a pipeline to detect the concentration of pyrolytic ions in the air in the collection chamber 311.

[0047] When in use, the combustible is placed on the heater 120 in the heating chamber 111, and the heater 120 is used to increase the temperature of the combustible so that the combustible is heated. During the heating process of the combustible, pyrolytic ions are generated and dispersed into the air in the heating chamber 111. With the flow of air, the pyrolytic ions enter the filter chamber 211, and enter the collection chamber 311 after passing through the first filter pore 222 of the first filter element. When the detector 320 detects the presence of pyrolytic ions in the collection chamber 311, it indicates that the pyrolytic ions have passed through the first filter pore 222 of the first filter element. Therefore, it can be determined that the particle size of the pyrolytic ions is at least less than or equal to the pore size of the first filter pore 222. By using the first filter element with different pore sizes, the particle size of the pyrolytic ions can be measured, thereby solving the problem that the pyrolytic ions are difficult to capture and difficult to measure at present, and has the advantages of simple structure and low measurement cost.

[0048] In some embodiments, the first filter element is a first filter graphite 220 , and the first filter graphite 220 includes a plurality of graphite particles 221 with a preset particle size, and the plurality of graphite particles 221 are collectively arranged to form a first filter pore 222 .

[0049] Specifically, Figure 3 As shown, the first filter graphite 220 is composed of a large number of graphite particles 221 arranged closely, and a microporous structure is formed between adjacent multiple graphite particles 221, thereby forming a first filter pore 222. By changing the particle size of the graphite particles 221, first filter pores 222 with different pore sizes can be formed, so that the first filter graphite 220 composed of graphite particles 221 with a suitable preset particle size can be selected according to the particle size range of the pyrolyzed ions to be measured. Of course, the first filter element can also use a filter material composed of other granular materials. Optionally, the preset particle size is 20nm, and at this time, the pore size of the first filter pore 222 formed in the first filter graphite 220 is 3.1nm. Therefore, when the detector 320 detects the presence of pyrolyzed ions in the collection chamber 311, it can be determined that the particle size is less than or equal to 3.1nm.

[0050] In some embodiments, the filter assembly 200 also includes a plurality of second filter elements disposed in the filter chamber 211, the plurality of second filter elements are located on the side of the first filter element facing the output port 213, and the plurality of second filter elements are stacked and arranged in a direction from the input and output ports toward the output port 213, the second filter elements have second filter pores, and the pore size of the second filter pores is larger than the pore size of the first filter pores 222.

[0051] Specifically, the second filter element is also a filter material with a microporous structure to form a plurality of second filter pores in the second filter element. The second filter element is also filled in the filter chamber 211, and a plurality of second filter elements are stacked and arranged below the first filter element in a vertical direction to perform secondary filtration on the air after the primary filtration by the first filter element.

[0052] The aperture of the second filter pore of the second filter element is larger than the aperture of the first filter pore 222, so that the second filter pores in the multiple stacked second filter elements are staggered to form a blocking structure, intercepting other tiny particles that can pass through the first filter pore 222, while the pyrolytic ions have the ability to penetrate and can smoothly pass through the stacked and staggered second filter pores into the collection chamber 311, thereby reducing the interference of other tiny particles in the air on the pyrolytic ions, ensuring the purity of the pyrolytic ions in the collection chamber 311, and improving the detection effect of the detector 320 on the pyrolytic ions.

[0053] The material of each second filter element can be the same or different, the second filter pores of each second filter element can also be set to the same or different pore sizes according to requirements, and the number of second filter elements can also be set according to actual requirements. For example, the plurality of second filter elements include a first filter paper 230, a second filter graphite 240, and a second filter paper 250 which are sequentially stacked in a direction from the input port 212 to the output port 213.

[0054] The first filter paper 230 and the second filter paper 250 are both made of porous fiber materials. The shapes of the first filter paper 230 and the second filter paper 250 are adapted to the shape of the filter cavity, for example, they are circular structures and fit closely to the inner wall of the cavity. The second filter graphite 240 is also composed of a large number of graphite particles 221. The particle size of the graphite particles 221 constituting the second filter graphite 240 can be larger than the particle size of the graphite particles 221 of the first filter graphite 220, so that the pore size of the second filter pore is larger than the pore size of the first filter pore 222. Optionally, the particle size of the first filter paper 230 and the second filter paper 250 are both 1 μm, and the grain size of the second filter graphite 240 is 1.3 μm, so that the first filter paper 230, the second filter graphite 240 and the second filter paper 250 are stacked on each other to form an interception structure.

[0055] In some embodiments, the detection assembly 300 further includes a vacuum pump 330 , which is connected between the connection port 312 and the detector 320 , and is used to transport the air in the collection chamber 311 to the detector 320 .

[0056] Specifically, the vacuum pump 330 can be a centrifugal pump or a screw pump. The vacuum pump 330 has an input end and an output end. The input end of the vacuum pump 330 can be connected to the connection port 312 of the collection chamber 311 through a rubber hose, and the output end of the vacuum pump 330 is connected to the detector 320 through a rubber hose. After starting the vacuum pump 330, the air in the collection chamber 311 will be transported to the detector 320, and a certain negative pressure state will be maintained in the collection chamber 311, ensuring that the air in the heating chamber 111 continues to enter the collection chamber 311 through the filter assembly 200 under the action of atmospheric pressure, thereby accelerating the flow rate of the air and enabling the detector 320 to detect the presence of thermally released ions as soon as possible.

[0057] In summary, the pyrolytic ion particle size measuring device provided in the embodiment of the present application generates pyrolytic ions by heating combustibles in the heating chamber 111. The pyrolytic ions enter the collecting chamber 311 along with the air in the heating chamber 111 after being filtered by the filter assembly 200. If the detector 320 detects the presence of pyrolytic ions in the collecting chamber 311, it indicates that the pyrolytic ions have passed through the first filter pore 222 of the first filter element, so that it can be determined that the particle size of the pyrolytic ions is less than or equal to the pore size of the first filter pore 222, so as to achieve the measurement of the particle size of the pyrolytic ions, which has the advantages of low cost and reliable measurement results.

[0058] In a second aspect, the present application also provides a method for measuring the particle size of a pyrolytic ion, using the pyrolytic ion particle size measuring device in the first aspect of the present application, combined with Figure 1-Figure 4 As shown, the method for measuring the particle size of thermal ions includes steps S401 to S404.

[0059] In step S401 , the combustible material is heated using the heater 120 .

[0060] The combustible material may be wood, paper, plastic or other materials. The heater 120 generates pyrolytic ions by heating the combustible material. The pyrolytic ions diffuse into the heating chamber 111 and enter the collection chamber 311 through the filter assembly 200, so that the detector 320 can detect the pyrolytic ions.

[0061] Specifically, the method of heating the combustible material using the heater 120 may include:

[0062] Turning on the heater 120 and gradually increasing the heating temperature of the heater 120;

[0063] When the heating temperature approaches the ignition temperature of the combustible, the heater 120 is turned off.

[0064] As the heater 120 continues to heat the combustible, the concentration of the generated pyrolytic ions gradually increases. When the heating temperature reaches a temperature close to the ignition point of the combustible, the concentration of the pyrolytic ions increases significantly. When the heating temperature exceeds the ignition point of the combustible, the combustible will begin to burn. Although pyrolytic ions can be generated, a large amount of smoke particles will also be generated, thereby affecting the accurate measurement of pyrolytic ions by the detector 320. In addition, when the detector 320 detects pyrolytic ions, it can also indicate that pyrolytic ions can be generated before the combustible begins to burn, verifying the early warning function of the pyrolytic ion detector 320 in practical applications.

[0065] In step S402 , the detector 320 is turned on to detect whether there are pyrolytic ions in the collection container 310 .

[0066] The detector 320 is used to detect the concentration of pyrolytic ions in the air. After the detector 320 is turned on, the detector 320 can obtain the concentration value of pyrolytic ions in the air in the collection chamber 311 of the collection container 310. When the pyrolytic ion particle size measuring device has a vacuum pump 330, the vacuum pump 330 can be turned on in advance before the detector 320 is turned on, and the air in the collection chamber 311 is transported to the detector 320 by the vacuum pump 330.

[0067] It is understandable that the heater 120 may be turned on first, and then the detector 320. The detector 320 may also be turned on in advance, and then the heater 120 may be turned on after the detector 320 runs smoothly. In some embodiments, when the detector 320 is turned on first and then the heater 120 is turned on, before the heater 120 is used to heat the combustible, the thermal ion particle size measurement method may further include:

[0068] Allowing the detector 320 to continue operating for a preset time period;

[0069] When the detector 320 does not detect the pyrolytic ions, the heater 120 is used to heat the combustible.

[0070] By running the detector 320 for a certain period of time in advance, the detection value of the detector 320 is relatively stable, and the presence of pyrolytic ions before the combustible is heated in the collection chamber 311 is detected to determine the accuracy of the detection data of the detector 320, and to avoid the influence of the measurement result of the pyrolytic ions on the pyrolytic ions due to the presence of pyrolytic ions in the collection chamber 311. The preset time length can be set according to the performance of the detector 320 and the measurement requirements, for example, 5 minutes to 10 minutes.

[0071] In step S403 , if pyrolytic ions are detected, it is determined that the particle size of the pyrolytic ions is smaller than the pore size of the first filtering pore 222 ; in step S404 , if no pyrolytic ions are detected, it is determined that the particle size of the pyrolytic ions is greater than or equal to the pore size of the first filtering pore 222 .

[0072] As the air flows in the heating chamber 111, the filtering chamber 211 and the collecting chamber 311, the air is filtered by the first filter element when passing through the filtering chamber 211. When the detector 320 detects the pyrolytic ions in the collecting chamber 311, and as the heating temperature increases, the concentration of the pyrolytic ions continues to increase, it can be proved that the pyrolytic ions have passed through the first filtering pores 222 of the first filtering element, and then it can be determined that the particle size of the pyrolytic ions is less than or equal to the pore size of the first filtering pores 222, thereby achieving the purpose of measuring the particle size of the pyrolytic ions, solving the problem that the pyrolytic ions have a short existence time and are difficult to capture, and has the advantages of low measurement cost and reliable measurement results.

[0073] The above description is only a preferred embodiment of the present application and is not intended to limit the present application. Any modifications, equivalent substitutions and improvements made within the spirit and principles of the present application should be included in the protection scope of the present application.

Claims

1. A pyrolysis ion particle size measuring device, characterized in that: include: A heating assembly, comprising a heating container and a heater, wherein the heating container has a heating chamber, the heater is arranged in the heating chamber, and the heater is used to heat combustibles; The filter assembly comprises a filter container and a first filter element, wherein the filter container has a filter chamber, and an input port and an output port both connected to the filter chamber, wherein the input port is connected to the heating chamber; the first filter element is disposed in the filter chamber and located between the input port and the output port, and has a first filter pore through which the pyrolyzed ions can pass; The detection component includes a collection container and a detector, wherein the collection container has a collection chamber, and a first connection port and a second connection port both connected to the collection chamber, wherein the first connection port is connected to the output port; the detector is connected to the second connection port and is used to detect thermally released ions in the collection chamber.

2. The thermal ion particle size measuring device according to claim 1, characterized in that: The first filter element includes a first filter graphite, which includes a plurality of graphite particles with a preset particle size, and the first filter pores are formed between the adjacent plurality of graphite particles.

3. The thermal ion particle size measuring device according to claim 2, characterized in that: The preset particle size is 20 nm, and the pore size of the first filtering pore is 3.1 nm.

4. The thermal ion particle size measuring device according to claim 1, characterized in that: The filter assembly also includes a plurality of second filter elements disposed in the filter chamber, wherein the plurality of second filter elements are located on a side of the first filter element facing the output port, and the plurality of second filter elements are stacked and arranged in a direction from the input port toward the output port, and the second filter element has a second filter pore, and the pore size of the second filter pore is larger than the pore size of the first filter pore.

5. The thermal ion particle size measuring device according to claim 4, characterized in that: The plurality of second filter elements include a first filter paper, a second filter graphite and a third filter paper which are sequentially stacked in a direction from the input port toward the output port.

6. The thermal ion particle size measuring device according to claim 5, characterized in that: The particle size of the first filter paper is 1 μm, the particle size of the second filter graphite is 1.3 μm, and the particle size of the third filter paper has a pore size of 1 μm.

7. The device for measuring the particle size of pyrolytic ions according to any one of claims 1 to 6, characterized in that: The detection assembly also includes a vacuum pump, which is connected between the connection port and the detector and is used to transport the air in the collection chamber to the detector.

8. A method for measuring the particle size of a pyrolytic ion, using the pyrolytic ion particle size measuring device according to any one of claims 1 to 7, characterized in that: The method for measuring the particle size of thermally released ions comprises: heating a combustible material using the heater; Turning on the detector to detect whether there are pyrolytic ions in the collection container; If the pyrolytic ions are detected, it is determined that the particle size of the pyrolytic ions is smaller than the pore size of the first filtering pore; If the pyrolytic ions are not detected, it is determined that the particle size of the pyrolytic ions is greater than or equal to the pore size of the first filtering pore.

9. The method for measuring the particle size of thermal ions according to claim 8, characterized in that: The method of heating the combustible material using the heater comprises: Turning on the heater and gradually increasing the heating temperature of the heater; The heater is turned off when the heating temperature approaches the ignition temperature of the combustible.

10. The method for measuring the particle size of thermal ions according to claim 8, characterized in that: After the detector is turned on, the method further includes: Allowing the detector to continue operating for a preset time period; When the detector does not detect the pyrolytic ions, the heater is used to heat the combustible material.

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