Electrostatic trap and electrostatic trapping pipe

Abstract

The utility model provides an electrostatic trap and an electrostatic trapping pipe, and belongs to the technical field of gas suction sampling devices. The electrostatic collecting pipe comprises a cylindrical pipe body which is transversely arranged during use, one transverse end of the cylindrical pipe body is provided with an installation structure used for being installed on an installation base of the electrostatic collector, the other transverse end of the cylindrical pipe body is connected with a diameter-expanded pipe body, and the maximum inner diameter and the maximum outer diameter of the diameter-expanded pipe body are larger than the inner diameter and the outer diameter of the cylindrical pipe body respectively. A collecting cavity used for collecting glycerol and propylene glycol in smoke is formed in an inner cavity of the expanding pipe body, and a connecting structure used for being connected with a smoking machine is arranged on the side, away from the cylindrical pipe body, of the expanding pipe body. According to the utility model, glycerol and propylene glycol in smoke are collected by utilizing the inner cavity of the expanding pipe body, and the glycerol and the propylene glycol are prevented from flowing to the inner wall of the cylindrical pipe body to dissolve captured particulate matters, so that the content of the particulate matters captured by the cylindrical pipe body can be improved, and the accuracy of subsequent smoke analysis is improved.

Description

Technical Field

[0001] This utility model relates to an electrostatic collector and an electrostatic collection tube, belonging to the technical field of gas extraction and sampling devices. Background Technology

[0002] An electrostatic precipitator is a device that uses electrostatic force to separate suspended particles and droplets from an airflow. It is widely used in flue gas analysis, industrial exhaust gas purification, and dust control. An electrostatic precipitator typically includes a mounting base with a high-voltage electrode and an electrostatic collection tube that serves as the dust collecting electrode. Dust-laden gas enters the collection tube and, as it passes through the high-voltage electrostatic field, the dust particles become charged and migrate to the collecting electrode. The particulate matter collected by the collecting electrode is then analyzed.

[0003] For example, the invention patent with authorization announcement number CN104597109B discloses a method for detecting the selenium content in mainstream cigarette smoke. Its collection principle involves fixing the cigarette to a cigarette holder, igniting the cigarette, and then using an electrostatic collection device to collect the selenium from the total particulate matter of the smoke. The gaseous components of the smoke are then fed through connecting pipes into two series-connected collection traps, where an acidified ethanol solution is used to collect the selenium from the gaseous components. The electrostatic collection device includes an electrostatic collection tube and an electrostatic generating end extending into the electrostatic collection tube. The main body of the electrostatic collection tube is cylindrical, with one end sealed to the tube seat (i.e., mounting base) of the electrostatic collection tube loading mechanism, and the other end sealed to the electrostatic collection tube interface (i.e., plug) of the smoking machine. Typically, a long glass tube is installed on the electrostatic collection tube interface of the smoking machine, and this long glass tube is connected to the smoking machine via a flexible tube.

[0004] Because flue gas aerosols contain glycerol and propylene glycol, which are highly viscous and soluble, glycerol and propylene glycol will adhere to the inner wall of the electrostatic precipitator and flow along the wall as the flue gas passes through it. This will dissolve the already captured particulate matter, thus affecting the content of the captured particulate matter and the accuracy of subsequent flue gas analysis. Utility Model Content

[0005] The purpose of this invention is to provide an electrostatic precipitator to solve the problem in the prior art where glycerol and propylene glycol adhere to the inner wall of the electrostatic precipitator and flow along the wall, dissolving the already captured particulate matter at the points they flow through, thus affecting the content of the captured particulate matter and the accuracy of subsequent flue gas analysis; the purpose of this invention is also to provide an electrostatic precipitator to solve the above problems.

[0006] To achieve the above objectives, the electrostatic collection tube in this utility model adopts the following technical solution:

[0007] An electrostatic precipitator includes a horizontally positioned cylindrical tube body. One horizontal end of the cylindrical tube body is provided with a mounting structure for mounting on a mounting base of an electrostatic precipitator. The other horizontal end of the cylindrical tube body is connected to an enlarged-diameter tube body. The maximum inner diameter and maximum outer diameter of the enlarged-diameter tube body are larger than the inner diameter and outer diameter of the cylindrical tube body, respectively. The inner cavity of the enlarged-diameter tube body forms a collection cavity for collecting glycerol and propylene glycol in flue gas. A connection structure for connecting to a smoking machine is provided on the side of the enlarged-diameter tube body away from the cylindrical tube body.

[0008] The beneficial effects of the above technical solution are as follows: This utility model is a pioneering invention. The electrostatic collection tube includes a horizontally placed cylindrical tube body. One horizontal end of the cylindrical tube body is provided with an installation structure to facilitate the installation of the electrostatic collection tube on the mounting base of the electrostatic collector. The other horizontal end of the cylindrical tube body is connected to an expanded diameter tube body. The side of the expanded diameter tube body away from the cylindrical tube body is provided with a connection structure for connecting to a smoke extraction machine, which facilitates the entry of flue gas into the electrostatic collection tube. At the same time, the maximum inner diameter and maximum outer diameter of the expanded diameter tube body are larger than the inner diameter and outer diameter of the cylindrical tube body, respectively. This makes the inner cavity of the expanded diameter tube body form a collection cavity for collecting glycerol and propylene glycol in the flue gas. This can prevent glycerol and propylene glycol from flowing to the inner wall of the cylindrical tube body and dissolving the already captured particulate matter, thereby increasing the content of particulate matter captured by the cylindrical tube body and improving the accuracy of subsequent flue gas analysis.

[0009] Furthermore, the expanded diameter tube is spherical.

[0010] Furthermore, the maximum outer diameter of the expanded tube is more than 1.2 times that of the cylindrical tube.

[0011] Furthermore, the outer diameter of the cylindrical tube is 29-31 mm, and the maximum outer diameter of the expanded tube is 39-41 mm.

[0012] Furthermore, the length of the expanded diameter tube in the transverse direction is less than the length of the cylindrical tube.

[0013] Furthermore, the connection structure is a cylindrical interface pipe, and the outer diameter of the interface pipe is smaller than the maximum outer diameter of the expanded pipe body.

[0014] Furthermore, the outer diameter of the cylindrical tube is more than three times the outer diameter of the interface tube.

[0015] Furthermore, the length of the interface tube is less than one-quarter of the length of the cylindrical tube body.

[0016] Furthermore, the mounting structure consists of a cylindrical tube with its end facing away from the enlarged tube.

[0017] To achieve the above objectives, the electrostatic collector of this utility model adopts the following technical solution:

[0018] An electrostatic collector includes a mounting base and an electrostatic collection tube mounted on the mounting base. The electrostatic collection tube includes a horizontally positioned cylindrical tube body. One horizontal end of the cylindrical tube body is provided with a mounting structure for mounting on the mounting base of the electrostatic collector. The other horizontal end of the cylindrical tube body is connected to an expanded diameter tube body. The maximum inner diameter and maximum outer diameter of the expanded diameter tube body are larger than the inner diameter and outer diameter of the cylindrical tube body, respectively. The inner cavity of the expanded diameter tube body forms a collection cavity for collecting glycerol and propylene glycol in flue gas. A connection structure for connecting to a smoking machine is provided on the side of the expanded diameter tube body away from the cylindrical tube body.

[0019] The beneficial effects of the above technical solution are as follows: This utility model is an improved invention, further defining the electrostatic collection tube. The electrostatic collection tube includes a horizontally placed cylindrical tube body. One horizontal end of the cylindrical tube body is provided with an installation structure to facilitate the installation of the electrostatic collection tube on the mounting base of the electrostatic collector. The other horizontal end of the cylindrical tube body is connected to an expanded diameter tube body. The side of the expanded diameter tube body away from the cylindrical tube body is provided with a connecting structure for connecting to a smoke extraction machine, facilitating the entry of flue gas into the electrostatic collection tube. At the same time, the maximum inner diameter and maximum outer diameter of the expanded diameter tube body are larger than the inner diameter and outer diameter of the cylindrical tube body, respectively, so that the inner cavity of the expanded diameter tube body forms a collection cavity for collecting glycerol and propylene glycol in the flue gas. This can prevent glycerol and propylene glycol from flowing to the inner wall of the cylindrical tube body and dissolving the already captured particulate matter, thereby increasing the content of particulate matter captured by the cylindrical tube body and improving the accuracy of subsequent flue gas analysis.

[0020] Furthermore, the expanded diameter tube is spherical.

[0021] Furthermore, the maximum outer diameter of the expanded tube is more than 1.2 times that of the cylindrical tube.

[0022] Furthermore, the outer diameter of the cylindrical tube is 29-31 mm, and the maximum outer diameter of the expanded tube is 39-41 mm.

[0023] Furthermore, the length of the expanded diameter tube in the transverse direction is less than the length of the cylindrical tube.

[0024] Furthermore, the connection structure is a cylindrical interface pipe, and the outer diameter of the interface pipe is smaller than the maximum outer diameter of the expanded pipe body.

[0025] Furthermore, the outer diameter of the cylindrical tube is more than three times the outer diameter of the interface tube.

[0026] Furthermore, the length of the interface tube is less than one-quarter of the length of the cylindrical tube body.

[0027] Furthermore, the mounting structure consists of a cylindrical tube with its end facing away from the enlarged tube. Attached Figure Description

[0028] Figure 1 This is a perspective view of Embodiment 1 of the electrostatic collection tube of this utility model;

[0029] Figure 2 This is a front view of Embodiment 1 of the electrostatic collection tube of this utility model;

[0030] Figure 3 This is a half-sectional view of Embodiment 1 of the electrostatic collection tube of this utility model.

[0031] In the diagram: 1. Cylindrical tube; 2. Expanded diameter tube; 3. Interface tube. Detailed Implementation

[0032] In view of the technical problems existing in the prior art, the basic concept of this utility model is to design a new electrostatic collection tube that can collect glycerol and propylene glycol in flue gas, so as to avoid the glycerol and propylene glycol flowing along the inner wall of the electrostatic collection tube and dissolving the already collected particulate matter.

[0033] The features and performance of this utility model will be further described in detail below with reference to the embodiments.

[0034] Example 1 of the electrostatic trapping tube in this utility model:

[0035] like Figure 1 , Figure 2 and Figure 3 As shown, the electrostatic precipitator includes a horizontally positioned cylindrical tube 1. One end of the cylindrical tube 1 has a mounting structure for installation on a mounting base of the electrostatic precipitator, facilitating installation. The other end of the cylindrical tube 1 is connected to an expanded-diameter tube 2. The side of the expanded-diameter tube 2 away from the cylindrical tube 1 has a connection structure for connecting to a fume extractor, facilitating the entry of flue gas into the electrostatic precipitator. The maximum inner and outer diameters of the expanded-diameter tube 2 are larger than those of the cylindrical tube 1, respectively. The inner cavity of the expanded-diameter tube 2 forms a collection chamber for collecting glycerol and propylene glycol in the flue gas. This prevents glycerol and propylene glycol from flowing onto the inner wall of the cylindrical tube 1 and dissolving the already collected particulate matter, thereby increasing the content of particulate matter collected by the cylindrical tube 1 and improving the accuracy of subsequent flue gas analysis.

[0036] Specifically, in this embodiment, the above-mentioned installation structure is formed by the end of the cylindrical tube 1 away from the expanded diameter tube 2, and is directly fitted onto the mounting base of the electrostatic precipitator through the tube opening. The structure is simple and easy to install.

[0037] The aforementioned connection structure is a cylindrical interface pipe 3. The outer diameter of the interface pipe 3 is smaller than the maximum outer diameter of the expanded pipe body 2. This allows the interface pipe 3 to be directly connected to the fume extractor via a flexible hose, eliminating the need for a plug at the end of the electrostatic collection tube and a long glass tube attached to the plug. This greatly simplifies the connection process. Furthermore, the flexible hose can be directly disconnected after the experiment, eliminating the need to disassemble the plug and long glass tube, simplifying operation and improving convenience. Moreover, by eliminating the long glass tube found in existing technologies, the adhesion of particulate matter in the flue gas to the inside of the long glass tube avoids affecting the accuracy of subsequent flue gas analysis.

[0038] Furthermore, the outer diameter of the cylindrical tube 1 is more than three times the outer diameter of the interface tube 3, and the length of the interface tube 3 is less than one-quarter of the length of the cylindrical tube 1, ensuring that the interface tube 3 is "thin and short", thereby ensuring the connection effect between the interface tube 3 and the hose, while avoiding the interface tube 3 being too long and affecting the collection effect of the cylindrical tube 1 on particulate matter in the flue gas.

[0039] In this embodiment, the expanded diameter tube 2 is spherical, which makes the transition between the inner and outer walls of the expanded diameter tube 2 smoother, and the shape more regular, making it easier to manufacture and form. The resulting collection cavity naturally bulges outward, which facilitates the collection of glycerol and propylene glycol in the flue gas.

[0040] Furthermore, the outer diameter of the expanded diameter tube 2 is more than 1.2 times that of the outer diameter of the cylindrical tube 1, ensuring that the expanded diameter tube 2 has a certain volume to facilitate the collection of glycerol and propylene glycol in the flue gas. At the same time, the transverse length of the expanded diameter tube 2 is less than the length of the cylindrical tube 1, ensuring that the cylindrical tube 1 has sufficient length to fully capture particulate matter in the flue gas.

[0041] In this embodiment, the electrostatic collection tube is entirely made of quartz glass, which facilitates manufacturing. Furthermore, the outer diameter of the cylindrical tube 1 is 29-31 mm, and the outer diameter of the expanded tube 2 is 39-41 mm, ensuring that the volume of the electrostatic collection tube is approximately 55 mL, which is closer to the inhalation volume of a human using an electronic cigarette, improving collection efficiency and enhancing the accuracy of subsequent smoke analysis. As one implementation method, the wall thickness of the electrostatic collection tube is 2.25 mm, the outer diameter of the interface tube 3 is 9 mm and its length is 10 mm, the outer diameter of the expanded tube 2 is 40 mm, and the outer diameter of the cylindrical tube 1 is 30 mm and its length is 50 mm.

[0042] In summary, the electrostatic collection tube of this invention, through the design of a spherical, expanded-diameter tube 2, effectively reduces the flow of glycerol and propylene glycol on the wall of the cylindrical tube 1, ensuring efficient collection of other chemical substances and improving collection efficiency. Simultaneously, the design of the interface tube 3 simplifies the connection between the electrostatic collection tube and the smoking device, eliminating the need for traditional plugs and long glass tubes, thus enhancing operational convenience. Furthermore, the volume of the electrostatic collection tube is reduced to approximately 55 mL, which is closer to the inhalation volume of a human using an electronic cigarette, ensuring that the collected smoke sample is more consistent with actual smoking conditions, improving sample representativeness and the accuracy of analytical results.

[0043] The superiority of the electrostatic precipitator tube of this invention will be verified by comparative experiments. An electronic cigarette smoking experiment was conducted using the electrostatic precipitator tube of this invention. When installing the electrostatic precipitator tube, first connect the interface tube 3 and the smoking machine through a flexible tube. Then, install the cylindrical tube body 1 on the mounting base of the electrostatic precipitator. Subsequently, connect the absorption bottle (used to capture gaseous substances in the smoke) which is placed in a dry ice / isopropanol cold trap and contains methanol. Adjust the voltage to -17.5kV and the smoking experiment can be carried out.

[0044] A deep aspiration method was used, with an aspiration volume of 55 mL, a aspiration duration of 2 seconds, and a aspiration frequency of one puff every 30 seconds, with 10 puffs per e-cigarette. After aspiration, the electrostatic collection tube was washed with 20 mL of methanol to obtain a methanol solution of the e-cigarette aerosol particles. A certain amount was taken into a chromatographic bottle, and acetophenone-d8, styrene-d8, and benzophenone-d8 were added to it. 10 Prepare a solution of diisobutyl phthalate-d4 internal standard and seal it for analysis. Transfer a certain amount of nicotine-in-methanol gas phase solution from the absorption flask to the chromatographic vial, and add acetophenone-d8, styrene-d8, and benzophenone-d4 to it. 10 Prepare a sealed solution of diisobutyl phthalate-d4 internal standard and prepare for testing.

[0045] The gaseous and particulate samples were separately analyzed by GC-MS / MS. The GC-MS / MS conditions were as follows: a flexible quartz capillary column; a stationary phase of 50% phenyl-methylpolysiloxane (60m × 0.25mm × 0.25μm); a pre-column (5m × 0.25mm) of silanized inert quartz capillary column connected in series at the injection port; an injection port temperature of 280℃; and an injection volume of [missing data]. 0.8–1.0 μL; the injection method is splitless injection; the carrier gas is 99.999% pure helium, constant flow mode, flow rate is 1.5 mL / min; the temperature program is as follows: initial temperature 40℃ held for 3 min, then increased to 75℃ at a rate of 5℃ / min, then increased to 120℃ at a rate of 1℃ / min, then increased to 160℃ at a rate of 2℃ / min, and finally increased to 290℃ at a rate of 5℃ / min and held for 10 min.

[0046] As shown in Table 1, this table presents the distribution results of some aroma components measured using the electrostatic collection tube of this invention under the deep suction method. The average release of isoamyl hexanoate in the gas phase is 3045 ng, and the average release of isoamyl hexanoate in the particulate phase is 3024 ng; the average release of γ-octanolide in the gas phase is 299 ng, and the average release of γ-octanolide in the particulate phase is 17625 ng.

[0047] Table 1. Distribution of aroma components in the electrostatic trapping tube of this invention.

[0048]

[0049] As shown in Table 2, under the same experimental conditions using a traditional cylindrical electrostatic precipitator, the average release of isoamyl hexanoate in the gaseous phase of the electronic cigarette was 4017 ng, and the average release of isoamyl hexanoate in the particulate phase was 2047 ng; the average release of γ-octanolide in the gaseous phase was 462 ng, and the average release of γ-octanolide in the particulate phase was 17451 ng. This demonstrates that the electrostatic precipitator of this invention has a higher collection efficiency than the traditional cylindrical electrostatic precipitator.

[0050] Table 2. Distribution of aroma components in traditional cylindrical electrostatic trapping tubes.

[0051]

[0052] In other embodiments of the electrostatic collecting tube: the electrostatic collecting tube may also be a plastic tube.

[0053] In other embodiments of the electrostatic collector tube: the mounting structure is not formed by the end of the cylindrical tube away from the expanded diameter tube, but by a constricted tube or a small-diameter cylindrical tube with an outer diameter smaller than the cylindrical tube connected to the end of the cylindrical tube, and the constricted tube or the small-diameter cylindrical tube constitutes the mounting structure.

[0054] In other embodiments of the electrostatic collection tube: the length of the interface tube can be exactly one-quarter of the length of the cylindrical tube, or it can be greater than one-quarter of the length of the cylindrical tube, but it cannot be too long, as long as it can be connected to the flexible tube.

[0055] In other embodiments of the electrostatic capture tube: the outer diameter of the cylindrical tube can be exactly three times the outer diameter of the interface tube, or it can be less than three times the outer diameter of the interface tube, but it cannot be too small, so as to ensure the capture effect of particulate matter in the flue gas.

[0056] In other embodiments of the electrostatic collection tube: the connection structure may not be an interface tube, but rather an opening on the side of the expanded diameter tube away from the cylindrical tube. In this case, when connecting to the smoking machine, a plug needs to be installed at the opening, and a long glass tube is installed on the plug. The long glass tube is connected to the smoking machine via software.

[0057] In other embodiments of the electrostatic trapping tube: the transverse length of the expanded tube body can be exactly equal to the length of the cylindrical tube body.

[0058] In other embodiments of the electrostatic trapping tube: the expanded diameter tube body may not be a spherical tube body, for example, it may be a cylindrical tube body, or two symmetrically arranged conical tube bodies, with the connection of the large ends of the two conical tube bodies forming the position of the maximum outer diameter and the maximum inner diameter of the expanded diameter tube body.

[0059] In other embodiments of the electrostatic collection tube: the outer diameter of the cylindrical tube can also be 29mm or 31mm, or it can be less than 29mm or greater than 31mm; at the same time, the maximum outer diameter of the expanded tube can be 39mm or 41mm, or it can be less than 39mm or greater than 41mm.

[0060] In other embodiments of the electrostatic collection tube: the length of the cylindrical tube can also be less than 50 mm, for example 45 mm, 46 mm, 47 mm, 48 mm or 49 mm, or greater than 50 mm, for example 51 mm, 52 mm, 53 mm, 54 mm or 55 mm.

[0061] In other embodiments of the electrostatic collecting tube: the wall thickness of the electrostatic collecting tube can be 2mm or 2.5mm, or it can be less than 2mm or greater than 2.5mm, for example, 3mm or 1.5mm.

[0062] In other embodiments of the electrostatic collection tube: the length of the interface tube can also be 8mm or 9mm, or of course 11mm, 12mm, 13mm, 14mm or 15mm.

[0063] In other embodiments of the electrostatic collection tube: the outer diameter of the interface tube can also be 8mm or 10mm, or it can be less than 8mm or greater than 10mm.

[0064] In other embodiments of the electrostatic trapping tube: the maximum outer diameter of the expanded tube body can be exactly equal to 1.2 times the outer diameter of the cylindrical tube body, or it can be less than 1.2 times the outer diameter of the cylindrical tube body, for example, 1.1 times or 1.15 times.

[0065] The embodiment of the electrostatic collector in this utility model is as follows: The electrostatic collector includes a mounting base and an electrostatic collection tube assembled on the mounting base. The structure of the electrostatic collection tube is the same as that of the electrostatic collection tube in any of the above embodiments, and will not be repeated here.

[0066] The above description is only a preferred embodiment of the present utility model and is not intended to limit the present utility model. The patent protection scope of the present utility model shall be determined by the claims. Similarly, any equivalent structural changes made based on the description and drawings of the present utility model shall also be included within the protection scope of the present utility model.

Claims

1. An electrostatic precipitator duct, characterized by, The cylindrical tube is horizontally arranged during use, one end of the cylindrical tube is provided with a mounting structure for mounting on a mounting seat of an electrostatic precipitator, the other end of the cylindrical tube is connected with a diameter-enlarged tube, the maximum inner diameter and the maximum outer diameter of the diameter-enlarged tube are greater than the inner diameter and the outer diameter of the cylindrical tube respectively, an inner cavity of the diameter-enlarged tube forms a collecting cavity for collecting glycerol and propylene glycol in the flue gas, and the diameter-enlarged tube is provided with a connecting structure for connecting a smoking machine on a side away from the cylindrical tube.

2. The electrostatic precipitator of claim 1, wherein, The diameter-enlarged tube is spherical.

3. The electrostatic precipitator of claim 1 or 2, wherein, The maximum outer diameter of the diameter-enlarged tube is greater than 1.2 times of the outer diameter of the cylindrical tube.

4. The electrostatic precipitator of claim 3, wherein, The outer diameter of the cylindrical tube is 29-31 mm, and the maximum outer diameter of the diameter-enlarged tube is 39-41 mm.

5. The electrostatic precipitator of claim 1 or 2, wherein, The length of the diameter-enlarged tube in the transverse direction is less than the length of the cylindrical tube.

6. The electrostatic precipitator of claim 1 or 2, wherein The connecting structure is a cylindrical interface pipe, and the outer diameter of the interface pipe is less than the maximum outer diameter of the diameter-enlarged tube.

7. The electrostatic precipitator of claim 6, wherein, The outer diameter of the cylindrical tube is greater than 3 times of the outer diameter of the interface pipe.

8. The electrostatic precipitator of claim 6, wherein, The length of the interface pipe is less than one fourth of the length of the cylindrical tube.

9. The electrostatic precipitator of claim 1 or 2, wherein, The mounting structure is formed by a pipe opening of the cylindrical tube away from the diameter-enlarged tube.

10. An electrostatic precipitator comprising a mounting base and an electrostatic precipitator tube mounted on the mounting base, characterized in that, The electrostatic precipitator is the electrostatic precipitator according to any one of claims 1-9.

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