Negative pressure formation anti-pollution device and system thereof
By adopting a unidirectional structure and a cleaning hole design in the negative pressure formation device, the problem of electrolyte dripping and contamination after negative pressure formation is solved, thus achieving cleanliness and process continuity in battery production.
Patent Information
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- SUNWODA MOBILITY ENERGY TECHNOLOGY CO LTD
- Filing Date
- 2025-06-06
- Publication Date
- 2026-07-10
AI Technical Summary
Existing negative pressure formation technology inevitably draws out a small amount of electrolyte during the vacuuming process, causing residual electrolyte to drip onto the battery casing after the negative pressure formation is completed, resulting in secondary pollution and affecting subsequent processes.
A negative pressure formation anti-contamination device was designed, including a nozzle and a suction rod. The nozzle is equipped with a one-way structure to divide the chamber into a first chamber and a second chamber. The one-way structure and the cleaning hole are used to prevent residual electrolyte from dripping after the negative pressure formation is completed. The residual electrolyte is also sucked up through the support part of the suction rod and the cleaning hole.
This effectively reduces the probability of residual electrolyte dripping onto the battery casing after negative pressure formation, causing secondary pollution and ensuring the cleanliness and continuity of the battery production process.
Smart Images
Figure CN224480974U_ABST
Abstract
Description
Technical Field
[0001] This utility model relates to the field of battery technology, and more specifically, to a negative pressure formation anti-pollution device and system thereof. Background Technology
[0002] With the booming development of the electric vehicle industry, lithium battery production technology and quality are receiving increasing attention. Among these technologies, negative pressure formation is a technique used in lithium battery production to activate battery active materials and form a solid electrolyte interphase (SEI) film. Its main feature is that by drawing a vacuum from the battery's electrolyte filling port, the internal pressure of the battery is lower than atmospheric pressure, thereby eliminating the gases generated during the formation process and ensuring the stability and consistency of the SEI film.
[0003] However, existing negative pressure formation technology inevitably draws out a small amount of electrolyte during the vacuuming process. After the negative pressure formation is completed, the residual electrolyte is easy to drip onto the battery casing, causing secondary pollution and affecting subsequent processes such as coating and assembly. Utility Model Content
[0004] The purpose of this invention is to provide a negative pressure formation anti-pollution device and system, so as to solve to a certain extent the technical problem in the prior art that residual electrolyte easily drips onto the battery casing after negative pressure formation, causing secondary pollution.
[0005] To achieve the above objectives, the present invention provides the following technical solution:
[0006] A negative pressure formation anti-pollution device includes a nozzle and a suction rod;
[0007] The nozzle has a nozzle chamber that extends along its own axis and is open at both ends; a one-way structure is provided in the nozzle chamber, the one-way structure dividing the nozzle chamber into a first chamber and a second chamber, the one-way structure being configured to prevent the medium from flowing from the first chamber to the second chamber;
[0008] The suction rod includes a main rod and a support rod communicating with the main rod; the end of the main rod is inserted into the first chamber of the suction nozzle;
[0009] The suction nozzle is provided with a cleaning hole that communicates with the first chamber.
[0010] In any of the above technical solutions, optionally, the unidirectional structure includes a main body and a peripheral body; the peripheral body is annular, the main body is connected to the interior of the peripheral body, and the main body protrudes from the peripheral body toward the first chamber;
[0011] The main body is provided with a through groove; the through groove is configured to connect the first chamber and the second chamber when the pressure in the first chamber is less than the pressure in the second chamber by a preset difference value; otherwise, the through groove is closed to block the first chamber from the second chamber.
[0012] The unidirectional structure is made of an elastic material.
[0013] Optionally, in any of the above technical solutions, the suction nozzle is provided with an annular assembly groove; at least a portion of the peripheral portion is accommodated within the assembly groove.
[0014] The cleaning hole is connected to the assembly slot.
[0015] In any of the above technical solutions, optionally, the elastic material is silicone, rubber, or elastic plastic;
[0016] The through groove is in the shape of a straight line, a cross, or a star.
[0017] In any of the above technical solutions, optionally, the outer surface of the main body facing away from the second chamber is a smooth curved surface;
[0018] The slope angle of the outer surface of the main body is 5°-30°;
[0019] The inner surface cross-section of the main body is conical, trapezoidal, or curved.
[0020] Optionally, in any of the above technical solutions, the contact end between the support rod and the main rod is higher than the end of the support rod that is away from the main rod.
[0021] In any of the above technical solutions, optionally, the number of the support rods is one or more;
[0022] The number of cleaning holes is one or more.
[0023] A negative pressure formation anti-contamination system includes a negative pressure formation drive device, a negative pressure cleaning drive device, and the aforementioned negative pressure formation anti-contamination device.
[0024] The negative pressure formation drive device is connected to the main rod section;
[0025] The negative pressure cleaning drive device is connected to the support rod and the cleaning hole respectively.
[0026] Optionally, in any of the above technical solutions, a first one-way valve and a first switch are provided on the pipeline between the negative pressure formation drive device and the main rod.
[0027] The negative pressure cleaning drive device is connected to a cleaning pipeline; the cleaning pipeline is connected to the support rod and the cleaning hole respectively; a second one-way valve and a second switch are provided on the cleaning pipeline.
[0028] Optionally, in any of the above technical solutions, the negative pressure formation drive device and the negative pressure cleaning drive device use the same drive device.
[0029] The main beneficial effects of this utility model are as follows:
[0030] The present invention provides a negative pressure formation anti-contamination device and system, including a nozzle and a suction rod. During negative pressure formation, the nozzle of the negative pressure formation anti-contamination device is inserted into the battery electrolyte filling port. The main rod of the suction rod is connected to the negative pressure formation driving device, and the support rod and the cleaning hole on the nozzle are respectively connected to the negative pressure cleaning driving device. When the negative pressure formation ends, the negative pressure cleaning driving device is activated. The support rod sucks up part of the residual electrolyte on the main rod. The one-way structure prevents the residual electrolyte from dripping into the second chamber and keeps it in the first chamber. The cleaning hole sucks up the residual electrolyte remaining in the first chamber, effectively reducing the probability of residual electrolyte dripping onto the battery casing and causing secondary contamination after the negative pressure formation is completed.
[0031] To make the above-mentioned objectives, features and advantages of this application more apparent and understandable, preferred embodiments are described below in detail with reference to the accompanying drawings. Attached Figure Description
[0032] To more clearly illustrate the technical solutions of the embodiments of this utility model, the drawings used in the embodiments will be briefly introduced below. It should be understood that the following drawings only show some embodiments of this utility model and should not be regarded as a limitation on the scope. For those skilled in the art, other related drawings can be obtained based on these drawings without creative effort.
[0033] Figure 1 This is a schematic diagram of the negative pressure formation anti-pollution device provided in an embodiment of the present utility model;
[0034] Figure 2 for Figure 1 The front view of the negative pressure anti-pollution device shown;
[0035] Figure 3 for Figure 2 The negative pressure anti-pollution device shown is a cross-sectional view along line AA.
[0036] Figure 4 for Figure 2 A half-sectional view of the negative pressure anti-pollution device from another perspective;
[0037] Figure 5 This is a schematic diagram of the unidirectional structure provided in an embodiment of the present utility model;
[0038] Figure 6 for Figure 5 A half-sectional view of the unidirectional structure shown;
[0039] Figure 7 This is a schematic diagram of the structure of the suction nozzle provided in an embodiment of the present utility model;
[0040] Figure 8 and Figure 9 for Figure 7 Half-section views of the suction nozzle from two different perspectives;
[0041] Figure 10 This is a schematic diagram illustrating the application of the negative pressure formation anti-pollution device provided in this embodiment of the utility model.
[0042] Icons: 100 - Negative pressure formation anti-pollution device; 110 - Suction nozzle; 111 - Suction nozzle chamber; 112 - First chamber; 113 - Second chamber; 114 - Cleaning hole; 115 - Assembly slot; 120 - Suction rod; 121 - Main rod; 122 - Support rod; 130 - One-way structure; 131 - Main body; 132 - Peripheral part; 133 - Through groove;
[0043] 200 - Negative pressure formation drive device; 210 - First one-way valve; 220 - First switch; 300 - Negative pressure cleaning drive device; 310 - Cleaning pipeline; 320 - Second one-way valve; 330 - Second switch; 400 - Battery. Detailed Implementation
[0044] To make the objectives, technical solutions, and advantages of the embodiments of this utility model clearer, the technical solutions of the embodiments of this utility model will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of this utility model, not all embodiments. The components of the embodiments of this utility model described and shown in the accompanying drawings can typically be arranged and designed in various different configurations.
[0045] Therefore, the following detailed description of the embodiments of the present invention provided in the accompanying drawings is not intended to limit the scope of the claimed invention, but merely to illustrate selected embodiments of the invention. All other embodiments obtained by those skilled in the art based on the embodiments of the present invention without inventive effort are within the scope of protection of the present invention.
[0046] It should be noted that similar labels and letters in the following figures indicate similar items. Therefore, once an item is defined in one figure, it does not need to be further defined and explained in subsequent figures.
[0047] In the description of this utility model, it should be noted that the terms "center," "upper," "lower," "left," "right," "vertical," "horizontal," "inner," and "outer," etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings, or the orientation or positional relationship commonly used when the product of this utility model is in use. They are only for the convenience of describing this utility model and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this utility model. In addition, the terms "first," "second," and "third," etc., are only used to distinguish descriptions and should not be construed as indicating or implying relative importance.
[0048] Furthermore, terms such as "horizontal," "vertical," and "sag" do not imply that components must be absolutely horizontal or suspended, but rather that they can be slightly tilted. For example, "horizontal" simply means that its direction is more horizontal relative to "vertical," and does not mean that the structure must be completely horizontal, but can be slightly tilted.
[0049] In the description of this utility model, it should also be noted that, unless otherwise explicitly specified and limited, the terms "set," "install," "connect," and "link" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; and they can refer to the internal connection of two components. Those skilled in the art can understand the specific meaning of the above terms in this utility model based on the specific circumstances.
[0050] The following detailed description, in conjunction with the accompanying drawings, outlines some embodiments of the present invention. Unless otherwise specified, the following embodiments and features can be combined with each other.
[0051] Existing negative pressure formation technology inevitably draws out a small amount of electrolyte during the vacuuming process. This residual electrolyte can easily drip onto the battery casing after negative pressure formation, causing secondary contamination and affecting subsequent processes such as coating and assembly. Therefore, this embodiment provides a negative pressure formation anti-contamination device and system to treat the residual electrolyte after negative pressure formation, preventing it from dripping onto the battery casing due to gravity.
[0052] Please refer to Figures 1-10 The negative pressure formation anti-contamination device provided in this embodiment includes a suction nozzle 110 and a suction rod 120. The suction rod 120 is inserted into one end of the suction nozzle 110, and the other end of the suction nozzle 110 is used to insert into the battery filling port.
[0053] The nozzle 110 has a nozzle chamber 111 extending along its own axis and open at both ends; a one-way structure 130 is provided in the nozzle chamber 111, the one-way structure 130 divides the nozzle chamber 111 into a first chamber 112 and a second chamber 113, and the one-way structure 130 is configured to prevent the medium from flowing from the first chamber 112 to the second chamber 113.
[0054] The suction rod 120 includes a main rod portion 121 and a support rod portion 122 communicating with the main rod portion 121; the end of the main rod portion 121 is inserted into the first chamber 112 of the suction nozzle 110.
[0055] The suction nozzle 110 is provided with a cleaning hole 114 that communicates with the first chamber 112.
[0056] Optionally, the unidirectional structure 130 is made of an elastic material. For example, the unidirectional structure 130 is an elastic convex valve structure. By using an elastic material in the unidirectional structure 130, it can undergo elastic deformation under negative pressure during the negative pressure formation process, thereby opening the unidirectional structure 130 and connecting the first chamber 112 and the second chamber 113; after the negative pressure formation is completed, the unidirectional structure 130 closes due to the elastic restoring force of the material itself, thereby blocking the first chamber 112 and the second chamber 113.
[0057] Alternatively, the elastic material may be silicone, rubber, or elastic plastic, or other elastic materials.
[0058] Optionally, the thickness of the unidirectional structure 130 is, for example, 0.3 mm to 2 mm.
[0059] The negative pressure formation anti-contamination device described in this embodiment includes a suction nozzle 110 and a suction rod 120. During negative pressure formation, the suction nozzle 110 of the negative pressure formation anti-contamination device is inserted into the battery electrolyte filling port. The main rod 121 of the suction rod 120 is connected to the negative pressure formation driving device, and the support rod 122 of the suction rod 120 and the cleaning hole 114 on the suction nozzle 110 are respectively connected to the negative pressure cleaning driving device. When the negative pressure formation ends, the negative pressure cleaning driving device is activated. The support rod 122 sucks up part of the residual electrolyte on the main rod 121. The one-way structure 130 prevents the residual electrolyte from dripping into the second chamber 113 and keeps it in the first chamber 112. The cleaning hole 114 sucks up the residual electrolyte remaining in the first chamber 112, effectively reducing the probability of residual electrolyte dripping onto the battery casing and causing secondary contamination after the negative pressure formation is completed.
[0060] During negative pressure formation, the negative pressure formation drive device 200 is activated, while the negative pressure cleaning drive device 300 is deactivated, and the support rod 122 and cleaning hole 114 are closed. After negative pressure formation is completed, the negative pressure formation drive device 200 is deactivated, while the negative pressure cleaning drive device 300 is activated, and the support rod 122 and cleaning hole 114 are connected. The support rod 122 absorbs some of the residual electrolyte on the main rod 121, and the cleaning hole 114 absorbs the residual electrolyte remaining in the first chamber 112, effectively reducing the probability of residual electrolyte dripping onto the battery casing and causing secondary pollution. In this process, the unidirectional structure 130 is opened by negative pressure during the negative pressure formation process, so that the gas inside the battery flows sequentially through the second chamber 113 and the first chamber 112 and is discharged from the main rod 121. After the negative pressure formation is completed, the unidirectional structure 130 closes due to the elastic recovery force of the material itself, so as to prevent the residual electrolyte from dripping into the second chamber 113 and remaining in the first chamber 112. The residual electrolyte remaining in the first chamber 112 is absorbed through the cleaning hole 114 to reduce contamination. At the same time, the negative pressure can dry the electrolyte inside the negative pressure formation anti-contamination device, further reducing electrolyte crystallization and extending the service life of the negative pressure formation anti-contamination device.
[0061] See Figures 3-6 As shown, in an optional embodiment, the unidirectional structure 130 includes a main body 131 and a peripheral part 132; the peripheral part 132 is annular, the main body 131 is connected to the interior of the peripheral part 132, and the main body 131 protrudes from the peripheral part 132 toward the first chamber 112; the protrusion of the main body 131 from the peripheral part 132 facilitates the guidance and collection of electrolyte dripping from the main rod part 121.
[0062] Optionally, the main body 131 is provided with a through groove 133; the through groove 133 is configured to connect the first chamber 112 and the second chamber 113 when the pressure in the first chamber 112 is less than the pressure in the second chamber 113 by a preset difference value; otherwise, the through groove 133 is closed to block the first chamber 112 and the second chamber 113; the through groove 133 provided in the main body 131 allows the main body 131 to undergo elastic deformation under negative pressure during the negative pressure formation process, so that the through groove 133 opens and connects the first chamber 112 and the second chamber 113; after the negative pressure formation is completed, the main body 131 closes the through groove 133 due to the elastic recovery force of the material itself, so as to block the first chamber 112 and the second chamber 113.
[0063] Optionally, the through groove 133 may be in the shape of a straight line, a cross, or a star, or other shapes.
[0064] See Figure 3 , Figure 4 , Figure 8 and Figure 9As shown, in an optional embodiment, the suction nozzle 110 is provided with an annular mounting groove 115; at least a portion of the peripheral portion 132 is accommodated in the mounting groove 115; the mounting groove 115 facilitates the installation of the peripheral portion 132 in the suction nozzle 110, that is, the one-way structure 130 is installed in the suction nozzle 110.
[0065] See Figures 1-3 , Figures 7-9 As shown, optionally, the cleaning hole 114 is connected to the assembly tank 115. The connection between the cleaning hole 114 and the assembly tank 115 facilitates the removal of residual electrolyte remaining in the first chamber 112 through the cleaning hole 114.
[0066] See Figures 3-6 As shown, in an optional embodiment, the outer surface of the main body 131 facing away from the second chamber 113 is a smooth curved surface; by adopting a smooth curved surface on the outer surface of the main body 131 facing away from the second chamber 113, it is easier to guide and collect the electrolyte dripping from the main rod 121.
[0067] Optionally, the slope angle of the outer surface of the main body 131 is 5°-30°; for example, the slope angle of the outer surface of the main body 131 is 5°, 8°, 15°, 20°, 25°, 27° or 30°, or other values.
[0068] In an optional embodiment, the inner surface cross-section of the main body 131 is conical, trapezoidal, or curved, or other shapes.
[0069] See Figures 1-3 As shown, in an optional embodiment, the contact end between the support rod 122 and the main rod 121 is higher than the end of the support rod 122 that is away from the main rod 121, that is, the support rod 122 is tilted downwards to prevent any electrolyte that may remain in the support rod 122 from flowing back into the main rod 121.
[0070] In an optional embodiment, the number of support rods 122 is one or more; for example, the number of support rods 122 is one, two, four or other numbers.
[0071] In an optional embodiment, the number of cleaning holes 114 is one or more; for example, the number of cleaning holes 114 is one, two, four or other numbers.
[0072] See Figure 10As shown, this embodiment also provides a negative pressure formation anti-contamination system, including a negative pressure formation drive device 200, a negative pressure cleaning drive device 300, and the negative pressure formation anti-contamination device 100 described in any of the above embodiments. The negative pressure formation drive device 200 is connected to the main rod portion 121. The negative pressure cleaning drive device 300 is connected to the support rod portion 122 and the cleaning hole 114, respectively. The suction nozzle 110 of the negative pressure formation anti-contamination device 100 is inserted into the liquid injection port of the battery 400.
[0073] The negative pressure formation anti-contamination system described in this embodiment includes a negative pressure formation anti-contamination device. During negative pressure formation, the suction nozzle 110 of the negative pressure formation anti-contamination device is inserted into the battery electrolyte filling port. The main rod 121 of the suction rod 120 is connected to the negative pressure formation drive device 200. The support rod 122 of the suction rod 120 and the cleaning hole 114 on the suction nozzle 110 are respectively connected to the negative pressure cleaning drive device 300. When the negative pressure formation ends, the negative pressure cleaning drive device is activated. The support rod 122 sucks up part of the residual electrolyte on the main rod 121. The one-way structure 130 prevents the residual electrolyte from dripping into the second chamber 113 and keeps it in the first chamber 112. The cleaning hole 114 sucks up the residual electrolyte remaining in the first chamber 112, effectively reducing the probability of residual electrolyte dripping onto the battery casing and causing secondary contamination after the negative pressure formation is completed.
[0074] See Figure 10 As shown, in the optional embodiment, a first one-way valve 210 and a first switch 220 are provided on the pipeline between the negative pressure formation drive device 200 and the main rod 121; the first switch 220 facilitates the control of the opening and closing of the pipeline between the negative pressure formation drive device 200 and the main rod 121; the first one-way valve 210 ensures that the negative pressure formation drive device 200 can unidirectionally extract gas from the main rod 121.
[0075] Optionally, the negative pressure cleaning drive device 300 is connected to a cleaning pipeline 310; the cleaning pipeline 310 is connected to the support rod portion 122 and the cleaning hole 114 respectively; a second one-way valve 320 and a second switch 330 are provided on the cleaning pipeline 310. The second switch 330 facilitates the control of the opening and closing of the pipeline between the negative pressure cleaning drive device 300 and the support rod portion 122 and the cleaning hole 114; the second one-way valve 320 ensures that the negative pressure cleaning drive device 300 can unidirectionally extract residual electrolyte from the support rod portion 122 and the cleaning hole 114.
[0076] In an optional embodiment, the negative pressure formation drive device 200 and the negative pressure cleaning drive device 300 use the same drive device. By using the same drive device for both, the cost of the negative pressure formation anti-contamination system is reduced. However, those skilled in the art can also configure the negative pressure formation drive device 200 and the negative pressure cleaning drive device 300 as different drive devices according to actual needs.
[0077] The negative pressure formation anti-contamination system provided in this embodiment includes the aforementioned negative pressure formation anti-contamination device. The technical features of the disclosed negative pressure formation anti-contamination device are also applicable to this negative pressure formation anti-contamination system, and the technical features of the disclosed negative pressure formation anti-contamination device will not be described again. The negative pressure formation anti-contamination system in this embodiment has the advantages of the aforementioned negative pressure formation anti-contamination device, and the advantages of the disclosed negative pressure formation anti-contamination device will not be described again here.
[0078] The working process of the negative pressure formation anti-contamination device and system provided in this embodiment is as follows: During negative pressure formation, the negative pressure formation anti-contamination device 100 moves downward so that the suction nozzle 110 is inserted into the electrolyte filling port of the battery 400. The negative pressure formation drive device 200 (the value is determined according to the process, and is generally between -45Pa and -45kPa in the industry) is connected to the main rod 121. The first switch 220 is turned on. At this time, the negative pressure cleaning drive device 300 does not work, and the second switch 330 is turned off. After the negative pressure formation is completed, the negative pressure formation anti-contamination device 100 is lifted upward so that the suction nozzle 110 is separated from the battery 400 casing to prevent the negative pressure cleaning drive device 300 from sucking out the electrolyte that has been injected into the battery 400. The negative pressure cleaning drive device 300 (the value is determined according to the process, and is generally between -10kPa and -20kPa in the industry) works, the second switch 330 is turned on, the negative pressure formation drive device 200 does not work, and the first switch 220 is turned off. The cleaning time of the negative pressure cleaning drive device 300 is, for example, 0.5 minutes to 2 minutes.
[0079] The above description is merely a preferred embodiment of this utility model and is not intended to limit the utility model. Various modifications and variations can be made to this utility model by those skilled in the art. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of this utility model should be included within the protection scope of this utility model.
Claims
1. A negative pressure formation anti-pollution device, characterized in that, Includes a nozzle (110) and a suction rod (120); The nozzle (110) has a nozzle chamber (111) extending along its own axis and open at both ends; a one-way structure (130) is provided in the nozzle chamber (111), the one-way structure (130) divides the nozzle chamber (111) into a first chamber (112) and a second chamber (113), the one-way structure (130) is configured to prevent the medium from flowing from the first chamber (112) to the second chamber (113); The suction rod (120) includes a main rod portion (121) and a support rod portion (122) communicating with the main rod portion (121); the end of the main rod portion (121) is inserted into the first chamber (112) of the suction nozzle (110); The suction nozzle (110) is provided with a cleaning hole (114) that communicates with the first chamber (112).
2. The negative pressure formation anti-pollution device according to claim 1, characterized in that, The unidirectional structure (130) includes a main body (131) and a peripheral body (132); the peripheral body (132) is annular, the main body (131) is connected to the interior of the peripheral body (132), and the main body (131) protrudes from the peripheral body (132) toward the first chamber (112). The main body (131) is provided with a through groove (133); the through groove (133) is configured to connect the first chamber (112) and the second chamber (113) when the pressure in the first chamber (112) is less than the pressure in the second chamber (113) by a preset difference value; otherwise, the through groove (133) is closed to block the first chamber (112) and the second chamber (113). The unidirectional structure (130) is made of an elastic material.
3. The negative pressure formation anti-pollution device according to claim 2, characterized in that, The nozzle (110) is provided with an annular assembly groove (115); at least part of the peripheral portion (132) is accommodated in the assembly groove (115); The cleaning hole (114) is connected to the assembly slot (115).
4. The negative pressure formation anti-pollution device according to claim 2, characterized in that, The elastic material is silicone, rubber, or elastic plastic; The through groove (133) is in the shape of a straight line, a cross, or a star.
5. The negative pressure formation anti-pollution device according to claim 2, characterized in that, The outer surface of the main body (131) facing away from the second chamber (113) is a smooth curved surface; The slope angle of the outer surface of the main body (131) is 5°-30°; The inner surface cross-section of the main body (131) is conical, trapezoidal or curved.
6. The negative pressure formation anti-pollution device according to claim 1, characterized in that, The contact end between the support rod (122) and the main rod (121) is higher than the end of the support rod (122) that is away from the main rod (121).
7. The negative pressure formation anti-pollution device according to claim 1, characterized in that, The number of the support rod (122) is one or more; The number of cleaning holes (114) is one or more.
8. A negative pressure formation anti-pollution system, characterized in that, It includes a negative pressure formation drive device (200), a negative pressure cleaning drive device (300), and a negative pressure formation anti-pollution device (100) as described in any one of claims 1-7. The negative pressure formation drive device (200) is connected to the main rod (121); The negative pressure cleaning drive device (300) is connected to the support rod (122) and the cleaning hole (114) respectively.
9. The negative pressure formation anti-pollution system according to claim 8, characterized in that, A first one-way valve (210) and a first switch (220) are provided on the pipeline between the negative pressure formation drive device (200) and the main rod (121). The negative pressure cleaning drive device (300) is connected to a cleaning pipeline (310); the cleaning pipeline (310) is connected to the support rod (122) and the cleaning hole (114) respectively; a second one-way valve (320) and a second switch (330) are provided on the cleaning pipeline (310).
10. The negative pressure formation anti-pollution system according to claim 8, characterized in that, The negative pressure formation drive device (200) and the negative pressure cleaning drive device (300) use the same drive device.