Electrostatic trapping tube and electrostatic trapping device

Abstract

The utility model provides an electrostatic trapping tube and an electrostatic trapping device, and belongs to the technical field of gas suction sampling devices. The electrostatic trapping pipe comprises a trapping pipe body used for trapping particulate matters in smoke, one end of the trapping pipe body is provided with an installation structure used for being installed on an installation base of the electrostatic trapping device, the other end of the trapping pipe body is provided with a connector pipe used for being directly connected with a hose connected with the smoke suction machine, and the connector pipe is cylindrical and is provided with a plurality of air holes. The outer diameter of the connector pipe is smaller than that of the trapping pipe body, and the length of the connector pipe is smaller than that of the trapping pipe body. The connector pipe is additionally arranged on the electrostatic trapping pipe, so that the electrostatic trapping pipe is more simply and conveniently connected with the smoking machine, a plug and a long glass pipe do not need to be additionally assembled during assembly before a test, the connector pipe can be directly connected with the hose, the hose can be directly pulled out after the test is finished, the step of disassembling the connector is omitted, the operation is simple, and the cost is low. And the operation convenience is improved.

Description

Technical Field

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

[0002] Electrostatic precipitators are devices that use electrostatic force to separate suspended particles and droplets from airflow. They are 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 acts 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 collected particulate matter 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 constricted ends. The structure of the electrostatic collection tube can also refer to the automated flue gas collection device and analysis method disclosed in the invention patent with authorization announcement number CN103674629B. In this invention, the constricted tube at one end of the electrostatic collection tube is used to seal with the tube seat (i.e., mounting seat) of the electrostatic collection tube loading mechanism, and the constricted tube at the other end is used to seal with the electrostatic collection tube interface of the smoking machine. A flue gas passage hole is provided in the middle of the electrostatic collection tube interface of the smoking machine, and the flue gas passage hole is used to connect to the smoking channel of the smoking machine.

[0004] The aforementioned electrostatic precipitator tube has a large diameter, so an additional electrostatic precipitator tube interface (equivalent to a plug) from a smoking machine is required to seal the tube opening during use. Typically, a long glass tube is installed on the smoking machine's electrostatic precipitator tube interface, connected to the smoking machine via a flexible hose. This increases the number of components that need to be assembled before the experiment and disassembled afterward, making operation cumbersome and reducing ease of use. Furthermore, the existing electrostatic precipitator tube is quite long, resulting in a large volume, which differs significantly from the inhalation capacity of a human cigarette. Combined with the use of a long glass tube connected to the smoking machine via a flexible hose, some particulate matter may adhere to the inside of the long glass tube, thus affecting the accuracy of subsequent flue gas analysis. Utility Model Content

[0005] The purpose of this utility model is to provide an electrostatic collection tube to solve the problem that existing electrostatic collection tubes require additional plugs and long glass tubes to connect to the flexible hose of the smoking machine, resulting in a large number of parts that need to be assembled and disassembled, making operation cumbersome and affecting the convenience of operation; the purpose of this utility model is also to provide an electrostatic collection device 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 precipitator body for precipitating particulate matter in flue gas. One end of the precipitator body is provided with a mounting structure for mounting on a mounting base of an electrostatic precipitator. The other end of the precipitator body is provided with an interface pipe for direct connection to a flexible hose connected to a fume extractor. The interface pipe is cylindrical, and its outer diameter is smaller than the outer diameter of the precipitator body, and its length is smaller than the length of the precipitator body.

[0008] The beneficial effects of the above technical solution are as follows: This utility model is an improved invention, mainly by directly adding an interface tube to the other end of the collecting tube body. The interface tube is cylindrical, and its outer diameter is smaller than that of the collecting tube body. The interface tube can be directly connected to the hose of the smoke extraction machine, and the length of the interface tube is less than that of the collecting tube body, which does not affect the normal function of the electrostatic collecting tube in collecting particulate matter in the flue gas. Before the test, there is no need to assemble a plug and a long glass tube separately. The electrostatic collecting tube can be directly connected to the hose. After the test, the hose can be directly unplugged, eliminating the step of disassembling the connector. The operation is simple and the convenience of operation is improved.

[0009] Furthermore, the collection tube body includes a cylindrical tube and a conical tube, with the conical tube connected between the cylindrical tube and the interface tube, and the length of the cylindrical tube being greater than the length of the conical tube.

[0010] Furthermore, the length of the cylindrical tube is more than twice the length of the conical tube.

[0011] Furthermore, the length of the conical tube is less than the length of the interface tube.

[0012] Furthermore, the outer diameter of the cylindrical tube is more than four times the outer diameter of the interface tube.

[0013] Furthermore, the length of the interface tube is 14-16mm and the outer diameter is 8-10mm, the length of the conical tube is 11-13mm, and the length of the cylindrical tube is 28-32mm and the outer diameter is 43-47mm.

[0014] Furthermore, the wall thickness of the electrostatic collection tube is 2-2.5 mm.

[0015] Furthermore, the mounting structure is formed by the end of a cylindrical tube that is away from the conical tube.

[0016] Furthermore, the electrostatic collection tube is a quartz glass tube.

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

[0018] An electrostatic precipitator includes a mounting base and an electrostatic precipitator tube mounted on the mounting base. The electrostatic precipitator tube includes a precipitator tube body for precipitating particulate matter in flue gas. One end of the precipitator tube body is provided with a mounting structure for mounting on the mounting base of the electrostatic precipitator. The other end of the precipitator tube body is provided with an interface tube for direct connection to a flexible hose connected to a fume extraction machine. The interface tube is cylindrical, and its outer diameter is smaller than the outer diameter of the precipitator tube body, and its length is smaller than the length of the precipitator tube body.

[0019] The beneficial effects of the above technical solution are as follows: This utility model is an improved invention, which further limits the structure of the electrostatic collecting tube. An interface tube is directly added to the other end of the collecting tube body. The interface tube is cylindrical and its outer diameter is smaller than that of the collecting tube body. The interface tube can be directly connected to the hose of the smoke extraction machine. Moreover, the length of the interface tube is less than the length of the collecting tube body, which does not affect the normal function of the electrostatic collecting tube in collecting particulate matter in the flue gas. There is no need to assemble a joint separately before the test. The electrostatic collecting tube can be directly connected to the hose. After the test, the hose can be directly unplugged, which saves the step of disassembling the joint. The operation is simple and improves the convenience of operation.

[0020] Furthermore, the collection tube body includes a cylindrical tube and a conical tube, with the conical tube connected between the cylindrical tube and the interface tube, and the length of the cylindrical tube being greater than the length of the conical tube.

[0021] Furthermore, the length of the cylindrical tube is more than twice the length of the conical tube.

[0022] Furthermore, the length of the conical tube is less than the length of the interface tube.

[0023] Furthermore, the outer diameter of the cylindrical tube is more than four times the outer diameter of the interface tube.

[0024] Furthermore, the length of the interface tube is 14-16mm and the outer diameter is 8-10mm, the length of the conical tube is 11-13mm, and the length of the cylindrical tube is 28-32mm and the outer diameter is 43-47mm.

[0025] Furthermore, the wall thickness of the electrostatic collection tube is 2-2.5 mm.

[0026] Furthermore, the mounting structure is formed by the end of a cylindrical tube that is away from the conical tube.

[0027] Furthermore, the electrostatic collection tube is a quartz glass 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] Figure 4 This is a perspective view of Embodiment 2 of the electrostatic collection tube of this utility model;

[0032] Figure 5 This is a half-sectional view of Embodiment 2 of the electrostatic collection tube of this utility model.

[0033] In the diagram: 1. Cylindrical tube; 2. Conical tube; 3. Interface tube; 4. Spherical tube. Detailed Implementation

[0034] To address the technical problems existing in the prior art, the basic concept of this utility model is to directly set an interface tube on the electrostatic collection tube, so that the electrostatic collection tube can be directly connected to the hose connected to the smoking machine without the need to install a connector, thereby improving the convenience of operation.

[0035] The features and performance of this utility model will be further described in detail below with reference to the embodiments.

[0036] Example 1 of the electrostatic trapping tube in this utility model:

[0037] like Figure 1 , Figure 2 and Figure 3 As shown, the electrostatic precipitator includes a precipitator body for precipitating particulate matter in flue gas. One end of the precipitator body is provided with a mounting structure for mounting on a mounting base of an electrostatic precipitator device, and the other end of the precipitator body is provided with an interface pipe 3 for direct connection to the hose connected to the fume extractor. In this embodiment, the precipitator body includes a cylindrical tube 1 and a conical tube 2. The conical tube 2 is connected between the cylindrical tube 1 and the interface pipe 3, so that there is a transition structure between the cylindrical tube 1 and the interface pipe 3, which facilitates the overall manufacturing and forming of the electrostatic precipitator. At the same time, the flue gas entering the precipitator body through the interface pipe 3 can gradually diffuse into the cylindrical tube 1 under the transition guidance of the inner cavity of the conical tube 2, making the flue gas smoother and ensuring the precipitating effect of particulate matter in the flue gas.

[0038] The interface pipe 3 is cylindrical, and its outer diameter is smaller than that of the collection pipe body, ensuring that the interface pipe 3 can be directly connected to the hose connected to the smoke extraction machine. At the same time, the length of the interface pipe 3 is less than that of the collection pipe body, so as to avoid the collection pipe body from being too long and affecting the collection effect of particulate matter in the flue gas.

[0039] Furthermore, the length of the cylindrical tube 1 is greater than the length of the conical tube 2, ensuring that the capture of particulate matter is completed more within the cylindrical tube 1, while the conical tube 2 mainly serves as a transition. Preferably, the length of the cylindrical tube 1 is more than twice the length of the conical tube 2.

[0040] Meanwhile, the length of the conical tube 2 is less than the length of the interface tube 3, and the outer diameter of the cylindrical tube 1 is more than 4 times the outer diameter of the interface tube 3, to ensure the connection effect between the interface tube 3 and the hose, to ensure the collection effect of the cylindrical tube 1 on particulate matter in the flue gas, and to ensure that the volume of the electrostatic collection tube is not too large.

[0041] In this embodiment, the interface tube 3 has a length of 14-16 mm and an outer diameter of 8-10 mm, the conical tube 2 has a length of 11-13 mm, the cylindrical tube 1 has a length of 28-32 mm and an outer diameter of 43-47 mm, and the electrostatic collection tube has a wall thickness of 2-2.5 mm, ensuring that the volume of the electrostatic collection tube is around 35 mL, which is closer to the inhalation volume of a human smoking a cigarette, thus improving the accuracy of subsequent smoke analysis. As another implementation, the electrostatic collection tube has a wall thickness of 2.25 mm, the interface tube 3 has a length of 15 mm and an outer diameter of 9 mm, the conical tube 2 has a length of 12 mm, and the cylindrical tube 1 has a length of 30 mm and an outer diameter of 45 mm.

[0042] In addition, the electrostatic collection tube is made entirely of quartz glass, which is convenient to manufacture. The above-mentioned installation structure consists of a cylindrical tube 1 with its end facing away from the conical tube 2. It is directly fitted onto the mounting base of the electrostatic collection device through the tube opening, which is simple in structure and easy to install.

[0043] In summary, the electrostatic collecting tube of this invention, by adding an interface tube 3, simplifies the connection between the electrostatic collecting tube and the smoking machine. Before the experiment, there is no need to separately assemble a plug and a long glass tube; the interface tube 3 can be directly connected to the flexible tube. After the experiment, the flexible tube can be directly disconnected, eliminating the step of disassembling the connector, simplifying operation and improving convenience. Furthermore, by eliminating the long glass tube found in existing technologies, particulate matter in the smoke is prevented from adhering to the inside of the long glass tube, thus avoiding any impact on the accuracy of subsequent smoke analysis. Moreover, the volume of the electrostatic collecting tube is reduced to approximately 35 mL, which is closer to the smoking volume of a human cigarette, ensuring that the collected smoke sample is more consistent with actual smoking conditions, improving sample representativeness and the accuracy of analytical results. Therefore, the electrostatic collecting tube of this invention not only improves collecting efficiency but also enhances operational convenience and analytical accuracy, resulting in significant economic benefits.

[0044] The superiority of the electrostatic collection tube of this invention is verified by comparative experiments. A traditional cigarette smoking experiment was conducted using the electrostatic collection tube of this invention. When installing the electrostatic collection tube, first connect the interface tube 3 and the smoking machine through a flexible tube. Then, install the cylindrical tube 1 on the mounting base of the electrostatic collection device. Subsequently, connect the absorption bottle (used to collect 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.

[0045] The ISO standard aspiration method was used. Five cigarettes were drawn per group, with one puff every 60 seconds. Each puff had a volume of 35 mL and a duration of 2 seconds. After aspiration, the electrostatic collection tube was washed with 20 mL of methanol to obtain a methanol solution of particulate matter. A certain amount was taken into a chromatographic bottle, and acetophenone-d8, styrene-d8, and benzophenone-d8 were added. 10 Prepare a solution of diisobutyl phthalate-d4 internal standard and seal it for analysis. Simultaneously, transfer a certain amount of the gaseous phase's methanol solution from the absorption bottle 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.

[0046] The gaseous and particulate samples were analyzed separately 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]. The sample volume was 0.8–1.0 μL; the injection method was splitless injection; the carrier gas was 99.999% pure helium, constant flow mode, and the flow rate was 1.5 mL / min; the temperature program was 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.

[0047] The distribution of aroma components in the gas and particulate phases of a reference cigarette is further illustrated in Table 1, which shows the aroma component distribution measured using the electrostatic collection tube of this invention under the ISO standard smoking mode. The average release of gas-phase methylene benzaldehyde is 660 ng, and the average release of particulate methylene benzaldehyde is 2825 ng; the average release of gas-phase phenethyl isobutyrate is 129 ng, and the average release of particulate phenethyl isobutyrate is 436 ng.

[0048] Table 1. Distribution of aroma components in the electrostatic trapping tube of this invention.

[0049]

[0050] Table 2 shows the distribution of aroma components measured using a traditional cylindrical electrostatic trap under the same experimental conditions. The average release of gaseous methylene benzaldehyde was 688 ng, and the average release of particulate methylene benzaldehyde was 2694 ng; the average release of gaseous phenethyl isobutyrate was 154 ng, and the average release of particulate phenethyl isobutyrate was 409 ng. This demonstrates that the electrostatic trap of this invention has a higher collection efficiency than the traditional cylindrical electrostatic trap.

[0051] Table 2. Distribution of aroma components in traditional cylindrical electrostatic trapping tubes.

[0052]

[0053] Example 2 of the electrostatic trapping tube in this utility model:

[0054] like Figure 4 and Figure 5As shown, the difference between this embodiment and Embodiment 1 is that, firstly, the entire electrostatic collection tube is used horizontally; secondly, the cylindrical tube 1 and the interface tube 3 are no longer connected by a conical tube, but by a spherical tube 4. That is, the collection tube body in this embodiment includes a cylindrical tube 1 and a spherical tube 4, and the outer diameter of the spherical tube 4 is larger than the outer diameter of the cylindrical tube 1, essentially acting as an expanded-diameter tube. Because glycerol and propylene glycol in flue gas aerosols are highly viscous and soluble, when they flow along the tube wall, they dissolve other particulate matter adhering to the tube wall, affecting the accuracy of flue gas analysis. However, with the spherical tube 4, its inner cavity forms a collection chamber, concentrating the glycerol and propylene glycol within this chamber, preventing them from flowing back into the cylindrical tube 1 and thus avoiding dissolving the particulate matter adhering to the inner wall of the cylindrical tube 1, thereby improving the accuracy of flue gas analysis.

[0055] In addition, since the electrostatic collection tube also includes the interface tube 3, it can be directly connected to the hose, just like in Example 1, and also has the effect of convenient operation.

[0056] In other embodiments of the electrostatic collecting tube: the electrostatic collecting tube may also be a plastic tube.

[0057] In other embodiments of the electrostatic collector tube: the mounting structure is not formed by the end of the cylindrical tube away from the conical 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.

[0058] 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.

[0059] In other embodiments of the electrostatic collection tube: the length of the interface tube can also be 14mm or 16mm, or it can be less than 14mm or greater than 16mm; the outer diameter of the interface tube can also be 8mm or 10mm, or it can be less than 8mm or greater than 10mm.

[0060] In other embodiments of the electrostatic trapping tube: the length of the conical tube can also be 11mm or 13mm, or it can be less than 11mm or greater than 13mm.

[0061] In other embodiments of the electrostatic collection tube: the length of the cylindrical tube can also be 28mm, 29mm, 31mm or 32mm, or it can be less than 28mm or greater than 32mm; the outer diameter of the cylindrical tube can also be 43mm, 44mm, 46mm or 47mm, or it can be less than 43mm or greater than 47mm.

[0062] In other embodiments of the electrostatic collection tube: the outer diameter of the cylindrical tube can be exactly 4 times the outer diameter of the interface tube, or it can be less than 4 times the outer diameter of the interface tube, for example, 3.5 times.

[0063] In other embodiments of the electrostatic trapping tube: the length of the conical tube body can be exactly equal to the length of the interface tube.

[0064] In other embodiments of the electrostatic trapping tube: the length of the cylindrical tube can be exactly twice the length of the conical tube, or it can be less than twice the length of the conical tube, for example, 1.5 times, 1.6 times or 1.8 times.

[0065] In other embodiments of the electrostatic capture tube: the capture tube body may consist only of a cylindrical tube, without the addition of a conical or spherical tube, that is, there is no transition tube between the interface tube and the cylindrical tube. In this case, the length of the cylindrical tube is much greater than the length of the interface tube, and of course, the outer diameter of the interface tube is smaller than the outer diameter of the capture tube body, so as to ensure that it can be directly connected to the flexible tube.

[0066] An embodiment of the electrostatic collection device in this utility model is as follows: The electrostatic collection device 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.

[0067] 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 precipitation duct comprising a duct body for capturing particulate matter in flue gas, one end of the duct body being provided with a mounting structure for mounting on a mounting seat of an electrostatic precipitation device, characterized in that, The other end of the collecting tube body is provided with an interface tube for directly connecting with the hose of the smoking machine, the interface tube is cylindrical, the outer diameter of the interface tube is smaller than that of the collecting tube body, and the length of the interface tube is smaller than that of the collecting tube body.

2. The electrostatic precipitator of claim 1, wherein, The collecting tube body comprises a cylindrical tube body and a conical tube body, the conical tube body is connected between the cylindrical tube body and the interface tube, and the length of the cylindrical tube body is greater than that of the conical tube body.

3. The electrostatic precipitator of claim 2, wherein, The length of the cylindrical tube body is more than twice the length of the conical tube body.

4. The electrostatic precipitator of claim 2, wherein, The length of the conical tube body is smaller than that of the interface tube.

5. The electrostatic precipitator of claim 2, wherein, The outer diameter of the cylindrical tube body is more than 4 times the outer diameter of the interface tube.

6. The electrostatic precipitator of any one of claims 2 to 5, wherein The length of the interface tube is 14-16 mm, the outer diameter is 8-10 mm, the length of the conical tube body is 11-13 mm, the length of the cylindrical tube body is 28-32 mm, and the outer diameter is 43-47 mm.

7. The electrostatic precipitator of claim 6, wherein, The wall thickness of the electrostatic collecting tube is 2-2.5 mm.

8. The electrostatic precipitator of any one of claims 2 to 5, wherein The mounting structure is formed by the tube opening at the end of the cylindrical tube body away from the conical tube body.

9. The electrostatic precipitator of any one of claims 1 to 5, wherein The electrostatic collecting tube is a quartz glass tube.

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

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