Online purifier

Abstract

The invention discloses an on-line purifier which comprises a case detachably connected with an on-line gas chromatograph, and further comprises a primary purifier core, a secondary purifier core and a control system which are arranged in the case, a heating device is arranged on the secondary purifier core, and the heating device is electrically connected with the control system. After the gas is introduced into the online purifier, the gas firstly passes through the primary purifier core to filter out particles with the particle size of more than 2 microns, and then passes through the secondary purifier core to remove hydrogen, oxygen, nitrogen, water, acid gas, hydrocarbon and other non-permanent (inert) gas at 400 DEG C. Therefore, under the condition of single-stage purification, 5N carrier gas (helium or argon) can be purified to 9N, the total impurity content after purification is less than 10ppb, and the purification requirement is met.

Description

Technical Field

[0001] The present invention relates to the technical field of purifiers, and more particularly, to an online purifier. Background Art

[0002] Currently, there are many gas purifier products on the market. Online purifiers are mainly used for carrier gas purification in high-purity online gas chromatographs. Its main principle is to remove hydrogen, oxygen, nitrogen, water, acid gases, hydrocarbons, and other non-permanent (inert) gases through physical and chemical methods at 400°C (±0.2°C). The impurities that can be removed by existing online purifiers are generally water, hydrogen, oxygen, nitrogen, carbon monoxide, carbon dioxide, methane, nitrogen oxides, ammonia, carbon trifluoride, carbon tetrachloride, silane, and low-melting-point hydrocarbons. The impurity level of the purified gas output is greater than 10 ppb, and it also contains impurities such as helium or argon that cannot be removed. Therefore, the gas purified by the existing purifier can meet the minimum purification requirements of the online gas chromatograph. However, for chromatographs with higher purification requirements, such as those requiring impurity levels less than 10 ppb or requiring the carrier gas to be purified to 9N, additional purification equipment is required, which will significantly occupy the equipment volume. Therefore, how to further improve the purification effect of the purifier is the technical problem to be solved by this application. Summary of the Invention

[0003] The Summary of the Invention introduces a series of simplified concepts that will be further described in the Detailed Description of the Invention. The Summary of the Invention is not intended to limit the key features and essential features of the claimed technical solution, nor is it intended to determine the scope of protection of the claimed technical solution.

[0004] To at least partially address the above-mentioned problems, the present invention provides an online purifier, comprising: a chassis detachably connected to an online gas chromatograph, and further comprising a primary purifier core, a secondary purifier core, and a control system disposed within the chassis, wherein the gas outlet of the primary purifier core is in communication with the gas inlet of the secondary purifier core, and the secondary purifier core is provided with a heating device electrically connected to the control system;

[0005] The primary purifier core is used to filter particles with a diameter greater than 2 microns;

[0006] The secondary purifier core is used to remove hydrogen, oxygen, nitrogen, water, acid gases, hydrocarbons, and / or other non-permanent gases;

[0007] The heating device is used to provide heat to the secondary purifier core;

[0008] The control system is used to control the heating device and provide maintenance cycle prompts.

[0009] Preferably, the control system consists of a temperature control system and a monitoring system. The temperature control system is connected to the heating device and is used to control the heating device. The monitoring system is selectively arranged on the first-stage purifier core and / or the second-stage purifier core and is used to monitor the purified gas.

[0010] Preferably, the primary purifier core is composed of an outer cylinder and a filter core, the filter core is arranged in the outer cylinder, and the outer cylinder is provided with an air inlet and an air outlet.

[0011] Preferably, the first-stage purifier core further includes an inner tube and a sleeve, the inner tube is arranged in the outer tube, one end of the inner tube is an air inlet end provided with an air inlet, the air inlet of the outer tube is communicated with the air inlet of the inner tube, the side wall of the inner tube is provided with a plurality of first air holes, the filter element is sleeved on the inner tube and located between the outer wall of the inner tube and the inner wall of the outer tube, the air outlet of the outer tube is composed of a plurality of second air holes provided on the outer tube, the sleeve is sleeved on the outside of the outer tube, and one end of the sleeve is an air outlet end.

[0012] Preferably, the first air holes are strip-shaped holes, and the first air holes are circumferentially arranged on the side wall of the inner cylinder.

[0013] Preferably, a gap is reserved between the inner wall of the sleeve and the outer wall of the outer tube, the second air hole is a strip hole, the second air hole is circumferentially arranged on the side wall of the outer tube, the opening area of ​​the second air hole is not larger than the opening area of ​​the first air hole, and the second air hole is arranged opposite to the first air hole.

[0014] Preferably, a plurality of third air holes are provided on the side wall of the outer cylinder, and the third air holes are strip-shaped holes. The third air holes are arranged on the side wall of the outer cylinder along the circumferential direction, and the second air holes and the third air holes are arranged alternately along the axial direction. The opening area of ​​the third air holes is not larger than that of the second air holes.

[0015] Preferably, the filter element is composed of a plurality of filter layers, and the filter element is made by folding the filter layers in a Z-shape.

[0016] Preferably, the heating device is a heat pipe, which is S-shaped and wrapped around the outside of the secondary purifier core. The side walls of the air inlet and air outlet of the secondary purifier core are both provided with threaded holes, and studs are provided in the threaded holes.

[0017] Preferably, the heating device further comprises a cladding layer, which is sleeved on the outside of the secondary purifier core, and the heat pipe is located within the cladding layer. The cladding layer is composed of an insulating sleeve and a plurality of support columns arranged on the inner wall of the insulating sleeve, and a gap is reserved between two adjacent support columns to form a plurality of slits distributed along the circumference and axial direction of the secondary purifier core, and the heat pipe is located within the slits.

[0018] Compared with the prior art, the present invention has at least the following beneficial effects:

[0019] After entering the online purifier, the gas first passes through a primary purifier core to remove particles larger than 2μm. It then passes through a secondary purifier core at a normal temperature of 400°C to remove hydrogen, oxygen, nitrogen, water, acid gases, hydrocarbons, and other non-permanent (inert) gases. This single-stage purification process can purify 5N carrier gas (helium or argon) to 9N, with the total impurity content reduced to less than 10ppb after purification, meeting purification requirements.

[0020] The online purifier of the present invention, other advantages, objectives and features of the present invention will be reflected in part through the following description, and in part will be understood by those skilled in the art through research and practice of the present invention. BRIEF DESCRIPTION OF THE DRAWINGS

[0021] The accompanying drawings are used to provide a further understanding of the present invention and constitute a part of the specification. Together with the embodiments of the present invention, they are used to explain the present invention and do not constitute a limitation of the present invention. In the accompanying drawings:

[0022] Figure 1 Schematic diagram of the structure of the online purifier of the present invention.

[0023] Figure 2 This is a schematic diagram of the online purifier of the present invention when it is not installed on an online gas chromatograph.

[0024] Figure 3 for Figure 1 Schematic diagram of the structure of the first-stage purifier core and the second-stage purifier core.

[0025] Figure 4 This is a schematic diagram of the structure of the first-stage purifier core (joints and other structures are not shown).

[0026] Figure 5 for Figure 4 Exploded diagram.

[0027] Figure 6 This is a cross-sectional view of the first-stage purifier core (joints and other structures are not shown).

[0028] Figure 7 It is a schematic diagram of the cross-sectional structure of the inner cylinder and the outer cylinder (the filter element and other structures are not shown).

[0029] Figure 8 A partial structural diagram of the filter element.

[0030] Figure 9 Schematic diagram of the structure of the secondary purifier core and heating device.

[0031] Figure 10 for Figure 9 Exploded diagram.

[0032] Figure 11 It is a schematic diagram of the cross-sectional structure of the secondary purifier core and the heating device (partial structure inside the secondary purifier core).

[0033] Figure 12 It is a schematic diagram of the cross-sectional structure of the heating device.

[0034] In the figure: 1 chassis, 2 first-stage purifier core, 21 outer cylinder, 211 second air hole, 212 third air hole, 22 filter element, 23 inner cylinder, 231 first air hole, 24 sleeve, 3 second-stage purifier core, 31 stud, 4 control system, 5 heating device, 51 heat pipe, 52 thermal insulation sleeve, 53 support column. DETAILED DESCRIPTION

[0035] The present invention will be further described in detail below with reference to the accompanying drawings and embodiments so that those skilled in the art can implement the invention with reference to the description.

[0036] It should be understood that terms such as “having”, “including” and “comprising” used herein do not preclude the existence or addition of one or more other elements or combinations thereof.

[0037] like Figures 1-12 As shown, the present invention provides an online purifier, comprising: a chassis 1 detachably connected to an online gas chromatograph, such as Figure 2 As shown, the online purifier is designed and processed as a whole so that it can be placed in the cabinet together with the online gas chromatograph. Compared with the prior art, the present application also includes a primary purifier core 2, a secondary purifier core 3 and a control system 4 arranged in the chassis 1. The gas outlet end of the primary purifier core 2 is connected to the gas inlet end of the secondary purifier core 3, as shown in FIG. Figure 1 and Figure 3 As shown, the secondary purifier core 3 is provided with a heating device 5, and the heating device 5 is electrically connected to the control system 4;

[0038] The primary purifier core 2 is used to filter particles with a diameter greater than 2 microns;

[0039] The secondary purifier core 3 is used to remove hydrogen, oxygen, nitrogen, water, acidic gases, hydrocarbons, and / or other non-permanent (inert) gases. The secondary purifier core 3 can be a commercially available product or existing technology;

[0040] The heating device 5 is used to provide heat to the secondary purifier core 3 to maintain the impurity removal temperature of the secondary purifier core 3;

[0041] The control system 4 is used to control the heating device 5. The control system 4 can also monitor and provide prompts for the maintenance cycle of the online purifier.

[0042] The control system 4 consists of a temperature control system and a monitoring system. The temperature control system is connected to the heating device 5 and is used to control the heating device 5. The temperature control system can be a commercially available product or a combination of existing technologies, such as a temperature controller, relay, or switch, capable of controlling the heating device 5. The monitoring system is a commercially available product or a combination of existing technologies. The monitoring system is selectively installed on the primary purifier core 2 and / or the secondary purifier core 3 to monitor the purified gas and supervise the maintenance cycle. Maintenance reminders are issued based on the monitoring results of the purified gas and the usage time of the primary purifier core 2.

[0043] Furthermore, as one of many embodiments, the first-level purifier core 2 is composed of an outer cylinder 21 and a filter core 22. The filter core 22 is arranged in the outer cylinder 21. The outer cylinder 21 is provided with an air inlet and an air outlet. The gas enters the outer cylinder 21 from the air inlet, is filtered by the filter core 22, and is discharged from the first-level purifier core 2 from the air outlet and flows to the second-level purifier core 3. The filter core 22 needs to use a 2μm filter core.

[0044] Furthermore, as one of many embodiments, the heating device 5 is a heat pipe 51, which is electrically connected to a temperature control system, and the temperature control system controls the switching and temperature adjustment of the heat pipe 51. In order to ensure uniform heating of the secondary purifier core 3, the heat pipe 51 is attached to the outer wall of the secondary purifier core 3, is arranged in an S-shape along the axial direction, and is circumferentially wrapped around the exterior of the secondary purifier core 3, as shown in FIG. Figure 10 and Figure 12 As shown, because the heat pipe 51 heats the secondary purifier core 3, in order to prevent the joint and the secondary purifier core 3 from leaking at the connection due to deformation caused by temperature difference, the secondary purifier core 3 is provided with threaded holes on the side walls of the air inlet end and the air outlet end. Studs 31 are provided in the threaded holes. After the joint is inserted into the air inlet end and the air outlet end, the studs 31 are tightened so that the studs 31 can fix the joint, thereby reducing the leakage caused by deformation due to temperature difference.

[0045] The working principle and beneficial effects of the above technical solution are as follows: After entering the online purifier, the gas first passes through the first-stage purifier core 2 to filter out particles larger than 2μm. It then passes through the second-stage purifier core 3 at a normal temperature of 400°C to remove hydrogen, oxygen, nitrogen, water, acid gases, hydrocarbons, and other non-permanent (inert) gases. This single-stage purification method can purify 5N carrier gas (helium or argon) to 9N, with the total impurity content reduced to less than 10 ppb after purification, meeting purification requirements.

[0046] In the aforementioned embodiment, we mentioned that a 2-micron filter element 22 can be placed within the outer cylinder 21. In this embodiment, the inlet and outlet of the outer cylinder 21 are typically located at either end of the outer cylinder 21, and the filter element 22 is cylindrically filled within the outer cylinder 21. This allows carrier gas to enter the inlet of the outer cylinder 21, be filtered by the filter element 22, and then be discharged through the outlet of the outer cylinder 21. Although the above embodiment can filter particles larger than 2 microns, because it only has one outlet, the carrier gas only flows through a single path within the outer cylinder 21 (from the inlet to the outlet). Over extended use, the filter element 22 can easily become filled or clogged with impurities, affecting the flow rate of gas discharged from the outlet of the outer cylinder 21 and, in turn, reducing the purified gas supply rate of the online purifier. To address this issue, we further provide an embodiment of a first-stage purifier element 2.

[0047] In this embodiment, the primary purifier core 2 further includes an inner cylinder 23 and a sleeve 24. The inner cylinder 23 is disposed within the outer cylinder 21. One end of the inner cylinder 23 is provided with an air inlet. The air inlet of the outer cylinder 21 is connected to the air inlet of the inner cylinder 23. Figure 6 As shown, when the inner cylinder 23 and the outer cylinder 24 are installed, the carrier gas will first enter the inner cylinder 23 and then flow to the outer cylinder 21. The side wall of the inner cylinder 23 is provided with a plurality of first air holes 231. The filter element 22 is sleeved on the inner cylinder 23 and is located between the outer wall of the inner cylinder 23 and the inner wall of the outer cylinder 21. The air outlet of the outer cylinder 21 is composed of a plurality of second air holes 211 provided on the outer cylinder 21. The sleeve 24 is sleeved on the outside of the outer cylinder 21. One end of the sleeve 24 is the air outlet end. According to the different setting positions of the second air holes 211, the position between the sleeve 24 and the outer cylinder 21 is also different.

[0048] When the second air hole 211 is set at the end of the outer cylinder 21 away from the air outlet, the inner wall of the sleeve 24 and the outer wall of the outer cylinder 21 can be fitted together, and the second air hole 211 is opposite to the air outlet at the air outlet end of the sleeve 24. When the carrier gas enters the first-stage purifier core 2, it first enters the inner cylinder 23, and is discharged from the first air hole 231 to between the inner cylinder 23 and the outer cylinder 21, and moves toward the direction of the second air hole 211. During the movement, it will be filtered by the filter element 22, and finally reach the air outlet at the air outlet end of the sleeve 24 through the second air hole 211, and move from the sleeve 24 to the air inlet end of the secondary purifier core 3.

[0049] By adding an inner cylinder 23 and providing a plurality of first air holes 231, the carrier gas is dispersed to different positions of the filter element 22, thereby increasing the flow paths of the carrier gas in the filter element 22, avoiding the aforementioned single gas flow path, and effectively avoiding the problem of a decrease in the gas supply rate of the online purifier due to impurity blockage.

[0050] When the second air holes 211 are arranged on the side wall of the outer cylinder 21, a gap is reserved between the inner wall of the sleeve 24 and the outer wall of the outer cylinder 21. Because each second air hole 211 is at a different distance from the gas outlet end of the sleeve 24, by arranging the second air holes 211 on the side wall of the outer cylinder 21, the gas can be discharged through each second air hole 211 and then merged in the sleeve 24, thereby reducing the gas supply rate difference and pressure difference before and after the carrier gas enters and exits the first-stage purifier core 3.

[0051] Furthermore, the first air holes 231 are strip-shaped holes, and the first air holes 231 are circumferentially arranged on the side wall of the inner cylinder 23, such as Figure 5 shown.

[0052] Furthermore, a gap is reserved between the inner wall of the sleeve 24 and the outer wall of the outer cylinder 21. The second air hole 211 is a strip-shaped hole. The second air hole 211 is circumferentially arranged on the side wall of the outer cylinder 21. The opening area of ​​the second air hole 211 is not larger than the opening area of ​​the first air hole 231, and the second air hole 211 is arranged opposite to the first air hole 231. Figure 5-Figure 7 As shown, the first air hole 231 and the second air hole 211 are both strip-shaped holes, with the side extending along the circumferential direction as the long side of the strip hole and the side extending along the axial direction as the wide side of the strip hole. The length of the long side of the first air hole 231 is less than the length of the long side of the second air hole 211, and the length of the wide side of the first air hole 231 is greater than the length of the wide side of the second air hole 211, and the opening area of ​​the second air hole 211 is not greater than the opening area of ​​the first air hole 231. Usually, the opening area of ​​the second air hole 211 is the same as the opening area of ​​the first air hole 231, but because the two have different shapes, after the carrier gas enters the filter element 22 from the first air hole 231, only a part of the carrier gas can directly reach the second air hole 211 (the overlapping part of the opening of the first air hole 231 and the second air hole 211), and the other part of the carrier gas will move in the filter element 22, move to the part where the first air hole 231 and the second air hole 211 do not overlap, and be discharged from the second air hole 211, thereby greatly increasing the flow area of ​​the carrier gas in the filter element 22.

[0053] Because the first air hole 231 and the second air hole 211 have an overlapping opening portion, this portion (equivalent to the case of the aforementioned single gas flow line) has a high risk of clogging. In order to further avoid the risk of clogging, a plurality of third air holes 212 are further provided on the side wall of the outer cylinder 21. The third air holes 212 are strip-shaped holes. The third air holes 212 are circumferentially arranged on the side wall of the outer cylinder 21. The second air holes 211 and the third air holes 212 are alternately arranged along the axial direction. The opening area of ​​the third air holes 212 is not larger than that of the second air holes 211. Figure 5-Figure 7As shown, the additionally provided third air hole 212 ensures that when the filter element 22 at the overlapping portion of the first air hole 231 and the second air hole 211 is blocked, the carrier gas can still be smoothly supplied to the secondary purifier core 3 .

[0054] Furthermore, the filter element 22 is composed of several filter layers. In order to be able to be conveniently put on the inner cylinder 23, the filter element 22 is usually a tubular structure, and the filter element 22 is made of a "tube wall" by folding the filter layers in a Z shape, such as Figure 8 As shown, the multi-layer folded structure filters particulate matter step by step to prevent impurities from completely blocking the first air hole 231 and affecting the carrier gas from entering the filter element 22. The Z-shaped folded structure makes the filter element 22 have a certain ductility, which can further prevent the first air hole 231 from being completely blocked.

[0055] Furthermore, since the online purifier is installed in a chassis 1 that can be connected to an online gas chromatograph, as Figure 2 As shown, if the heating device 5 only uses the heat pipe 51, heat will overflow and be transferred to the online gas chromatograph through the stainless steel chassis 1, resulting in a shortened service life of the online gas chromatograph (internal electronic components) due to the high temperature. The commonly used thermal insulation method is to install thermal insulation material inside the chassis 1 to reduce the diffusion of heat to the online gas chromatograph, but this will cause the temperature inside the chassis 1 to be too high, resulting in a shortened service life of the online purifier. To this end, we further provide an embodiment of the heating device 5.

[0056] In this embodiment, the heating device 5 further includes a coating layer, which is disposed on the exterior of the secondary purifier core 3. The heat pipe 51 is located within the coating layer. The coating layer is composed of a thermal insulation sleeve 52 and a plurality of support columns 53 disposed on the inner wall of the thermal insulation sleeve 52. The thermal insulation sleeve 52, as the outermost protective material, can insulate the secondary purifier core 3 and prevent high temperatures from affecting the primary purifier core 2 and the control system 4. The support columns 53 are typically rectangular columnar structures and extend from the inner wall of the thermal insulation sleeve 52 toward the secondary purifier core 3. The end faces of the support columns 53 abut against the outer wall of the secondary purifier core 3. Figure 11 As shown, a gap is reserved between two adjacent support columns 53 to form a plurality of (cross-shaped) slits distributed along the circumference and axial direction of the secondary purifier core 3, and the heat pipe 51 is located in the slit, as shown in FIG. Figure 12 As shown, the support column 53 can fix the heat pipe 51 through the slit, and can also be used for heat preservation, such as Figure 12 As shown, the slits along the axial direction are used to fix the heat pipe 51, and the slits along the circumferential direction form a heat preservation space to reduce heat overflow.

[0057] In the description of the present invention, it should be understood that the terms "center", "longitudinal", "lateral", "length", "width", "thickness", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside", "clockwise", "counterclockwise", "axial", "radial", "circumferential" and the like to indicate orientations or positional relationships based on the orientations or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying 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 limiting the present invention.

[0058] In the present invention, unless otherwise specified or limited, the terms "installed," "connected," "connect," "fixed," etc. should be understood in a broad sense. For example, they can refer to fixed connection, detachable connection, or integration; mechanical connection, electrical connection, or communication; direct connection or indirect connection through an intermediate medium; internal communication between two elements or interaction between two elements, unless otherwise specified. Those skilled in the art will understand the specific meanings of the above terms in the present invention based on specific circumstances.

[0059] Although the embodiments of the present invention have been disclosed above, they are not limited to the applications listed in the description and implementation methods. They can be fully applied to various fields suitable for the present invention. For those familiar with the art, additional modifications can be easily implemented. Therefore, without departing from the general concept defined by the claims and the scope of equivalents, the present invention is not limited to the specific details and illustrations shown and described herein.

Claims

1. An online purifier comprising: A chassis (1) detachably connected to an online gas chromatograph, characterized in that it further comprises a primary purifier core (2), a secondary purifier core (3) and a control system (4) arranged in the chassis (1), wherein the gas outlet of the primary purifier core (2) is communicated with the gas inlet of the secondary purifier core (3), and the secondary purifier core (3) is provided with a heating device (5), and the heating device (5) is electrically connected to the control system (4); The primary purifier core (2) is used to filter particles with a diameter greater than 2 microns; The secondary purifier core (3) is used to remove hydrogen, oxygen, nitrogen, water, acid gases, hydrocarbons, and / or other non-permanent gases; The heating device (5) is used to provide heat to the secondary purifier core (3); The control system (4) is used to control the heating device (5) and provide maintenance cycle prompts.

2. The online purifier according to claim 1, characterized in that The control system (4) is composed of a temperature control system and a monitoring system. The temperature control system is connected to the heating device (5) and is used to control the heating device (5). The monitoring system is selectively arranged on the first-stage purifier core (2) and / or the second-stage purifier core (3) and is used to monitor the purified gas.

3. The online purifier according to claim 1, characterized in that The primary purifier core (2) is composed of an outer cylinder (21) and a filter core (22). The filter core (22) is arranged in the outer cylinder (21). The outer cylinder (21) is provided with an air inlet and an air outlet.

4. The online purifier according to claim 3, characterized in that The primary purifier core (2) further comprises an inner tube (23) and a sleeve (24), wherein the inner tube (23) is arranged in the outer tube (21), one end of the inner tube (23) is an air inlet end provided with an air inlet, the air inlet of the outer tube (21) is communicated with the air inlet of the inner tube (23), a side wall of the inner tube (23) is provided with a plurality of first air holes (231), the filter core (22) is sleeved on the inner tube (23) and is located between the outer wall of the inner tube (23) and the inner wall of the outer tube (21), the air outlet of the outer tube (21) is composed of a plurality of second air holes (211) provided on the outer tube (21), and the sleeve (24) is sleeved on the outside of the outer tube (21), and one end of the sleeve (24) is an air outlet end.

5. The online purifier according to claim 4, characterized in that The first air hole (231) is a strip-shaped hole, and the first air hole (231) is circumferentially arranged on the side wall of the inner cylinder (23).

6. The online purifier according to claim 5, characterized in that A gap is reserved between the inner wall of the sleeve (24) and the outer wall of the outer cylinder (21); the second air hole (211) is a strip-shaped hole; the second air hole (211) is circumferentially arranged on the side wall of the outer cylinder (21); the opening area of ​​the second air hole (211) is not larger than the opening area of ​​the first air hole (231); and the second air hole (211) and the first air hole (231) are arranged opposite to each other.

7. The online purifier according to claim 6, characterized in that A plurality of third air holes (212) are further provided on the side wall of the outer cylinder (21), wherein the third air holes (212) are strip-shaped holes and are arranged on the side wall of the outer cylinder (21) along the circumferential direction. The second air holes (211) and the third air holes (212) are alternately arranged along the axial direction, and the opening area of ​​the third air holes (212) is not larger than that of the second air holes (211).

8. The online purifier according to claim 3, characterized in that The filter core (22) is composed of a plurality of filter layers, and the filter core (22) is made by folding the filter layers in a Z-shape.

9. The online purifier according to claim 1, characterized in that The heating device (5) is a heat pipe (51), which is S-shaped and wrapped around the outside of the secondary purifier core (3). The side walls of the air inlet and air outlet of the secondary purifier core (3) are both provided with threaded holes, and studs (31) are provided in the threaded holes.

10. The online purifier according to claim 9, characterized in that The heating device (5) further comprises a coating layer, the coating layer being sheathed on the outside of the secondary purifier core (3), the heat pipe (51) being located within the coating layer, the coating layer being composed of a heat-insulating sleeve (52) and a plurality of support columns (53) arranged on the inner wall of the heat-insulating sleeve (52), a gap being reserved between two adjacent support columns (53), forming a plurality of slits distributed along the circumference and axial direction of the secondary purifier core (3), and the heat pipe (51) being located within the slits.

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