SF6 gas sampling and filtering device with anti-blocking function

Abstract

The invention discloses an SF6 gas sampling and filtering device with an anti-clogging function, and relates to the technical field of filtering devices, the SF6 gas sampling and filtering device comprises a gas cylinder assembly, a filtering assembly, a lower connecting assembly and a clogging indication assembly. Through a pure mechanical structure of double filter elements, a negative pressure driving piston ring block and air bag indication, when the upper filter element is completely blocked, negative pressure generated by a sampling pump is increased, the piston ring block is automatically pushed to move downwards, continuous sampling of SF6 gas is ensured, sampling failure or equipment damage caused by blockage of the filter elements is avoided, and meanwhile, the sampling efficiency is improved. An operator can judge whether the upper filter element is completely blocked or not in real time through the position of the piston ring block, so that the filter element is determined to be replaced after sampling is finished, waste caused by blind replacement or sampling interruption caused by untimely replacement is avoided, the design is particularly suitable for short-time and intermittent SF6 gas sampling scenes, and the sampling efficiency is improved. The problems that blockage of a traditional filtering device cannot be predicted, and the replacement time is difficult to grasp are effectively solved.

Description

Technical Field

[0001] This invention relates to the field of filtration device technology, specifically an SF6 gas sampling and filtration device with anti-clogging function. Background Technology

[0002] SF6 gas sampling refers to the process of collecting representative gas samples from high-voltage electrical equipment (such as circuit breakers and GIS) filled with sulfur hexafluoride (SF6) gas according to standard methods. Its core purpose is to evaluate the insulation and arc-extinguishing performance of the equipment by analyzing the purity of the sample, decomposition products (such as SO2, H2S, CO, etc.) and humidity, and to determine whether there are internal faults or moisture. This is a key link in preventive testing and condition-based maintenance in the power industry.

[0003] According to the current standard DL / T 1032—2023, the conventional SF6 gas sampling procedure does not include a filtration step. However, based on actual testing needs, filtration is indeed required in the following two special cases:

[0004] Micro-water test: Powdered particles (such as AlF3, CuF2, with a particle size of 2~5μm) are generated inside circuit breakers or GIS equipment due to electric arc decomposition. If not filtered, they will contaminate the micro-water meter sensor, causing data drift or even damaging the instrument.

[0005] Decomposition product analysis: When detecting characteristic fault gases such as SO2, H2S, and CO, if the sample gas contains solid particles, it may clog the chromatographic column or sensor gas path, affecting the detection accuracy of characteristic fault gases such as SO2, H2S, and CO.

[0006] SF6 gas sampling is characterized by short-term, intermittent operation, rather than continuous filtration. Traditional filtration devices have the following problems:

[0007] Inspectors cannot determine the degree of filter blockage, making it difficult to replace the filter in time before it fails.

[0008] Continuing to use it until it becomes completely blocked will affect the sampling process;

[0009] Replacing a usable filter prematurely would result in a waste of resources.

[0010] To address the aforementioned pain points, an SF6 gas sampling and filtration device with anti-clogging function is provided. Summary of the Invention

[0011] The purpose of this invention is to provide an SF6 gas sampling and filtering device with anti-clogging function in order to solve the problems mentioned above.

[0012] To achieve the above objectives, the present invention provides the following technical solution: an SF6 gas sampling and filtering device with anti-clogging function, comprising a gas cylinder assembly, a filter assembly, and a lower connecting assembly, wherein the gas cylinder assembly comprises an outer cylinder, an air inlet, a thickened inner liner, a connecting block, and an inner cylinder;

[0013] The air inlet is fixed to the top of the outer cylinder and communicates with the inner cavity of the outer cylinder. The thickened inner liner is integrally formed on the top of the inner side of the outer cylinder. The inner cylinder is distributed in the middle of the inner cavity of the outer cylinder and is fixedly connected to the inner wall of the connecting block through the connecting block. The top of the inner cylinder does not contact the top of the inner cavity of the outer cylinder.

[0014] The filter assembly is installed in the inner cavity of the inner cylinder, and two filter assemblies are vertically installed on the inner side of the inner cylinder. An upper ventilation slot and a lower ventilation slot are respectively opened on the outer side of the inner cylinder at the position aligned with the two filter assemblies.

[0015] The lower connection assembly includes a sealing base plate and an air outlet;

[0016] The sealing base plate is threaded to the inner side of the bottom of the outer cylinder and pressed against the bottom of the filter assembly below. The air outlet is fixed to the bottom of the sealing base plate and communicates with the central cavity of the filter assembly. A polygonal block is fixed to the outside of the air outlet.

[0017] The air inlet is connected to the sampling device through an external pipeline, and the air outlet is connected to the sampling device through an external pipeline. The pump of the sampling device generates suction to sample the sulfur hexafluoride gas inside the sampling device. The filter assembly is used to filter the airflow passing through the cylinder structure composed of the air cylinder assembly and the filter assembly.

[0018] The inner cavity of the outer cylinder is located between the thickened inner liner and the top of the sealing bottom plate, and a blockage indicator component is also provided. The blockage indicator component is used to warn of the complete blockage of the upper filter component.

[0019] The inner side of the inner cylinder is also equipped with a disassembly auxiliary component pull rod, which is used to assist in the disassembly of the filter component.

[0020] As a further embodiment of the present invention: the blockage indicator component includes an annular air chamber, a rubber liner, an inner protruding rubber bladder, and a piston ring block;

[0021] The annular air chamber is installed between the bottom of the thickened inner lining and the bottom of the sealing base plate and is in close contact with the inner wall of the outer cylinder;

[0022] The rubber liner is fixed to the inside of the annular air chamber, the inner protruding rubber bladder is formed on the inside of the rubber liner, and a through opening is provided at the position where the annular air chamber and the inner protruding rubber bladder are aligned.

[0023] The piston ring block is sleeved between the outer side of the inner cylinder and the inner side of the rubber liner, and the upper surface of the piston ring block is in contact with the lower surface of the thickened liner, and the lower surface of the piston ring block is in contact with the upper surface of the inner protruding rubber bladder.

[0024] When the filter components mentioned above are not completely blocked, the airflow flows along the air inlet, the upper ventilation slot and the channel formed by the two filter components to the air outlet;

[0025] When the filter assembly described above is completely blocked, the negative pressure in the space below the piston ring block increases, causing the piston ring block to move downward and squeeze the inner protruding rubber bladder to deform and contract. Through the downward movement of the piston ring block, the airflow flows along the channel formed by the air inlet, the lower ventilation slot, and the lower filter assembly to the air outlet.

[0026] As a further embodiment of the present invention: multiple inner protruding rubber bladders are evenly arranged circumferentially, and high-pressure air is injected into the inner cavity of the annular air chamber.

[0027] As a further embodiment of the present invention: an N-shaped spring is installed on the inner side of the annular air chamber at the through-hole position, one side plate of the N-shaped spring is bonded and fixed to the inner wall of the inner protruding rubber bladder, and the other side plate of the N-shaped spring is attached to the inner wall of the outer ring of the annular air chamber.

[0028] As a further embodiment of the present invention: the filter assembly includes a filter element and a ring seat;

[0029] The ring seat is symmetrically fixed to the upper and lower ends of the filter element. A second ring groove is provided on the outer side of the ring seat, and a second sealing element is installed on the ring seat through the second ring groove.

[0030] When the filter assembly is installed inside the inner cylinder, it fits tightly against the inner wall of the inner cylinder through the second seal.

[0031] As a further embodiment of the present invention: the disassembly auxiliary component pull rod includes a top block, a pull rod, and a spherical block;

[0032] The top block is installed on the top inner side of the inner cylinder, and the top ring seat of the filter assembly above is in close contact with the top block;

[0033] The pull rod is fixed to the middle of the bottom of the top block and extends downward to the inside of the filter assembly below; the spherical block is fixed to the bottom of the pull rod.

[0034] The bottom of the spherical block is at a higher level than the bottom of the filter assembly below it.

[0035] As a further embodiment of the present invention: a third annular groove is provided at the top of the sealing base plate and at the position where it is aligned with the annular air chamber and the filter assembly. A third sealing element and a fourth sealing element are respectively installed on the sealing base plate through the two third annular grooves. The third sealing element and the fourth sealing element are respectively in close contact with the filter element and the lower surface of the annular air chamber.

[0036] The bottom of the thickened inner liner is provided with a first annular groove, and a first sealing element is installed inside the first annular groove. The first sealing element is tightly fitted to the top of the annular air chamber.

[0037] As a further embodiment of the present invention: the bottom horizontal height of the thickened inner lining is level with the bottom horizontal height of the upper ventilation slot;

[0038] The outer side of the inner cylinder has no slots in the middle area between the upper and lower ventilation slots, and the docking position of the two filter components is located in the middle of this area;

[0039] The height between the bottom of the upper ventilation slot and the bottom of the lower ventilation slot is greater than the height of the piston ring block;

[0040] The inner and outer wall diameters of the piston ring block are matched with the outer diameter of the inner cylinder and the inner diameter of the rubber liner, respectively, and the outer diameter of the piston ring block is larger than the inner diameter of the thickened liner.

[0041] As a further embodiment of the present invention: the outer cylinder, air inlet, thickened inner liner, connecting block, and inner cylinder are all made of transparent plastic material;

[0042] The annular air chamber is made of transparent plastic, and the rubber liner and the inner protruding rubber bladder are made of transparent rubber.

[0043] Compared with the prior art, the beneficial effects of the present invention are:

[0044] 1. The sampling pump utilizes a purely mechanical structure consisting of dual filter elements, a negative pressure-driven piston ring block, and an airbag indicator. When the upper filter element is completely clogged, the negative pressure generated by the pump increases, automatically pushing the piston ring block downwards. This seamlessly switches the filter channel from the upper to the lower one, achieving automatic switching from the upper filter element to the lower one after the upper filter element becomes clogged. The switching process is fully automated and requires no manual intervention or electronic sensors, ensuring continuous SF6 gas sampling and preventing sampling failures or equipment damage due to filter element clogging.

[0045] 2. By observing the position of the piston ring block, the operator can determine in real time whether the upper filter element is completely clogged, and thus decide to replace the filter element after sampling. This avoids waste caused by blind replacement or sampling interruption caused by failure to replace in time. This design is particularly suitable for short-term, intermittent SF6 gas sampling scenarios and effectively solves the pain points of traditional filter devices such as "unpredictable clogging and difficulty in grasping the timing of replacement". Attached Figure Description

[0046] Figure 1 This is a schematic diagram of the structure of the present invention;

[0047] Figure 2 This is a cross-sectional view of the structure of the present invention;

[0048] Figure 3 This is a cross-sectional view of the present invention;

[0049] Figure 4 This is a schematic diagram showing the disassembled lower connecting component of the present invention;

[0050] Figure 5 This is a cross-sectional view of the air cylinder assembly of the present invention;

[0051] Figure 6 This is a schematic diagram of the annular air chamber, rubber liner, and inner protruding rubber bladder of the present invention.

[0052] Figure 7 This is a cross-sectional view of the annular air chamber, rubber liner, and inner protruding rubber bladder of the present invention.

[0053] Figure 8 This is a cross-sectional exploded view of the annular air chamber, rubber liner, and inner protruding rubber bladder of the present invention.

[0054] Figure 9 This is a schematic diagram showing the breakdown of the filtering component of the present invention.

[0055] In the diagram: 1. Air cylinder assembly; 101. Outer cylinder; 102. Air inlet; 103. Thickened inner liner; 104. First annular groove; 105. Connecting block; 106. Inner cylinder; 107. Upper ventilation slot; 108. Lower ventilation slot; 2. Filter assembly; 201. Filter element; 202. Ring seat; 203. Second annular groove; 204. Second seal; 3. Lower connecting assembly; 301. Sealing base plate; 302. Air outlet. 303. Polygonal block; 304. Third annular groove; 305. Third seal; 306. Fourth seal; 4. Blockage indicator assembly; 401. Annular air chamber; 402. Through port; 403. Rubber liner; 404. Inner protruding rubber bladder; 405. Piston ring block; 406. N-shaped spring; 5. Disassembly auxiliary assembly; 501. Top block; 502. Pull rod; 503. Spherical block; 6. First seal. Detailed Implementation

[0056] The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0057] In the description of this invention, it should be noted that the terms "center," "upper," "lower," "left," "right," "vertical," "horizontal," "inner," and "outer," etc., indicating orientation or positional relationships, are based on the orientation or positional relationships shown in the accompanying drawings and are only for the convenience of describing this invention 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, and therefore should not be construed as a limitation of this invention. Furthermore, the terms "first," "second," and "third" are used for descriptive purposes only and should not be construed as indicating or implying relative importance. In the description of this invention, it should be noted that unless otherwise explicitly specified and limited, the terms "installed," "connected," "linked," and "set up" 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 communication of two components. Those skilled in the art can understand the specific meaning of the above terms in this invention based on the specific circumstances. The following describes embodiments of the invention based on its overall structure.

[0058] Please see Figures 1 to 9 In this embodiment of the invention, an SF6 gas sampling and filtering device with anti-clogging function includes a gas cylinder assembly 1, a filter assembly 2, and a lower connecting assembly 3. The gas cylinder assembly 1 includes an outer cylinder 101, an air inlet 102, a thickened inner liner 103, a connecting block 105, and an inner cylinder 106.

[0059] The air inlet 102 is fixed to the top of the outer cylinder 101 and communicates with the inner cavity of the outer cylinder 101. The thickened inner liner 103 is integrally formed on the top of the inner side of the outer cylinder 101. The inner cylinder 106 is distributed in the middle of the inner cavity of the outer cylinder 101 and is fixedly connected to the inner wall of the connecting block 105 through the connecting block 105. The top of the inner cylinder 106 does not contact the top of the inner cavity of the outer cylinder 101.

[0060] The filter assembly 2 is installed in the inner cavity of the inner cylinder 106, and two filter assemblies 2 are vertically installed inside the inner cylinder 106. The upper ventilation slot 107 and the lower ventilation slot 108 are respectively opened on the outer side of the inner cylinder 106 at the position aligned with the two filter assemblies 2.

[0061] The lower connecting component 3 includes a sealing base plate 301 and an air outlet 302;

[0062] The sealing base plate 301 is threaded to the inner side of the bottom of the outer cylinder 101 and pressed against the bottom of the filter assembly 2 below. The air outlet 302 is fixed to the bottom of the sealing base plate 301 and communicates with the middle cavity of the filter assembly 2. A polygonal block 303 is fixed on the outside of the air outlet 302.

[0063] The air inlet 102 is connected to the sampling device through an external pipeline, and the air outlet 302 is connected to the sampling device through an external pipeline. The pump of the sampling device generates suction to sample the sulfur hexafluoride gas inside the sampling device. The filter assembly 2 is used to filter the airflow passing through the cylinder structure composed of the air cylinder assembly 1 and the filter assembly 2.

[0064] A blockage indicator component 4 is also provided in the inner cavity of the outer cylinder 101 between the thickened inner liner 103 and the top of the sealing bottom plate 301. The blockage indicator component 4 is used to warn of the complete blockage of the upper filter component 2.

[0065] The inner side of the inner cylinder 106 is also equipped with a disassembly auxiliary component pull rod 5, which is used to assist in the disassembly of the filter component 2;

[0066] The blockage indicator assembly 4 includes an annular air chamber 401, a rubber liner 403, an inner protruding rubber bladder 404, and a piston ring block 405.

[0067] The annular air chamber 401 is installed between the bottom of the thickened inner liner 103 and the bottom of the sealing base plate 301 and is in contact with the inner wall of the outer cylinder 101.

[0068] The rubber liner 403 is fixed to the inner side of the annular air chamber 401, the inner protruding rubber bladder 404 is formed on the inner side of the rubber liner 403, and a through opening 402 is provided at the position where the annular air chamber 401 and the inner protruding rubber bladder 404 are aligned.

[0069] Piston ring block 405 is sleeved between the outer side of inner cylinder 106 and the inner side of rubber liner 403, and the upper surface of piston ring block 405 is in contact with the lower surface of thickened liner 103, and the lower surface of piston ring block 405 is in contact with the upper surface of inner protruding rubber bladder 404.

[0070] When the upper filter component 2 is not completely blocked, the airflow flows along the channel formed by the air inlet 102, the upper ventilation slot 107 and the two filter components 2 toward the air outlet 302.

[0071] When the upper filter assembly 2 is completely blocked, the negative pressure in the space below the piston ring block 405 increases, causing the piston ring block 405 to move down and squeeze the inner protruding rubber bladder 404 to deform and contract. Through the downward movement of the piston ring block 405, the airflow flows along the channel formed by the air inlet 102, the lower ventilation slot 108, and the lower filter assembly 2 to the air outlet 302.

[0072] Multiple protruding rubber bladders 404 are evenly arranged circumferentially, and high-pressure air is injected into the inner cavity of the annular air chamber 401.

[0073] In this embodiment, the working principle of this filtration device is as follows:

[0074] 1. Under normal filtration conditions (upper filter element 201 is not blocked), the air pump of the sampling device starts, generating a continuous negative pressure (suction force) at the air outlet 302. The SF6 gas in the sampled device enters the inner cavity of the outer cylinder 101 through the air inlet 102. At this time, because the piston ring block 405 is initially in close contact with the lower surface of the thickened inner liner 103, and the upper ventilation slot 107 is in an open state, the airflow preferentially flows along the shortest path:

[0075] Air inlet 102 → Upper part of the inner cavity of outer cylinder 101 → Upper ventilation slot 107 → Enters the annular gap between inner cylinder 106 and upper filter assembly 2 → Passes through upper filter element 201 → Enters the middle cavity of upper filter element 201 → Passes downward through the cavity of filter element 201 → Exits through air outlet 302;

[0076] At this time, the lower filter assembly 2 and the lower ventilation slot 108 are not involved in the operation.

[0077] 2. Automatic switching and indication when the upper filter element 201 is completely clogged: When the upper filter element 201 is completely clogged due to accumulated particles, the pressure downstream (the middle cavity of the inner cylinder 106) drops sharply. The space below the piston ring block 405 (i.e., the annular cavity between the outer wall of the inner cylinder 106 and the rubber liner 403) is connected to the middle cavity through the lower ventilation slot 108, so the negative pressure in this space increases synchronously.

[0078] The downward force on piston ring 405 is equal to the negative pressure generated by the sampling pump × the effective area of ​​piston ring.

[0079] The piston ring block 405 is subjected to an upward force = the supporting force transmitted by the high-pressure air in the annular air chamber 401 through the inner protruding rubber bladder 404 (initially the air chamber inflates to support the piston ring block 405).

[0080] When the downward pulling force generated by the negative pressure is greater than the upward supporting force of the airbag, the piston ring block 405 begins to move downward;

[0081] (It should be noted that during normal filtration, the negative pressure is relatively low (due to the low resistance of the filter element), and the downward force is insufficient to overcome the airbag support force; after clogging, the negative pressure increases significantly, the downward force exceeds the threshold, and the piston ring block 405 moves downward.)

[0082] As the piston ring block 405 moves downward, it gradually compresses the inner protruding rubber bladder 404 (causing it to contract and deform inward), further compressing the high-pressure air in the annular air chamber 401 and storing elastic potential energy. Simultaneously, the piston ring block 405 moves downward, gradually exposing the lower ventilation slot 108. Once the lower ventilation slot 108 is fully open, the airflow path automatically switches to:

[0083] Air inlet 102 → Inner cavity of outer cylinder 101 → Lower ventilation slot 108 → Enters the annular gap between inner cylinder 106 and lower filter assembly 2 → Passes through lower filter element 201 → Enters the central cavity of lower filter element 201 → Air outlet 302;

[0084] At this time, the lower filter element 201 takes over to ensure that the sampling is uninterrupted. At the same time, the downward movement of the piston ring block 405 makes it easy for the sampling personnel to intuitively judge whether the upper filter element 201 is completely blocked.

[0085] 3. Replace the completely clogged upper filter assembly 2 and reset the piston ring block 405: After the upper filter assembly 2 is completely clogged, disassemble the lower connecting assembly 3 by turning the polygonal block 303. At this time, the two filter assemblies 2 can be taken out. Then, the lower filter assembly 2 is reinstalled into the inner cylinder 106, and a new filter assembly 2 is taken out and installed into the inner cylinder 106 (that is, the newly installed filter assembly 2 is the lower filter assembly 2).

[0086] Next, remove the blockage indicator component 4 as a whole, adjust the movable ring block 405 above the inner protruding rubber bladder 404, reinstall it, and finally install the lower connecting component 3.

[0087] Please refer to this carefully. Figures 7-8 An N-shaped spring plate 406 is installed on the inner side of the annular air chamber 401 at the position of the through-hole 402. One side plate of the N-shaped spring plate 406 is bonded and fixed to the inner wall of the inner protruding rubber bladder 404, and the other side plate of the N-shaped spring plate 406 is attached to the inner wall of the outer ring of the annular air chamber 401.

[0088] In this embodiment: when the piston ring block 405 presses down on the protruding rubber bladder 404, the N-shaped spring sheet 406 will be compressed synchronously and store the rebound force;

[0089] After the piston ring block 405 passes through the highest protruding position of the inner protruding rubber bladder 404 (it should be noted that the side cross-section of the inner protruding rubber bladder 404 is inverted triangular in shape, such as...), Figure 7 / 8), the squeezing force on the inner protruding rubber bladder 404 is reduced. Under the dual action of the elastic force of the N-shaped spring 406 and the air pressure inside the annular air chamber 401, the inner protruding rubber bladder 404 will pop out and reset. With the negative pressure of the space below, the piston ring block 405 can quickly move down to the bottom, so that the lower ventilation slot 108 can be fully opened.

[0090] Meanwhile, the inner protruding rubber bladder 404, which is restored to its initial state, can prevent the piston ring block 405 from moving upward, thereby placing the piston ring block 405 at the bottom (i.e., the alarm position). This makes it easier for the testing personnel to intuitively determine the complete blockage of the upper filter assembly 2, and then disassemble and replace the upper filter assembly 2 after sampling.

[0091] In addition, the N-shaped spring 406 can prevent the inner protruding rubber bladder 404 from collapsing or undergoing irreversible deformation due to excessive compression, ensuring the stable reset of the inner protruding rubber bladder 404.

[0092] Please refer to this carefully. Figures 2 to 5 as well as Figure 9 The filter assembly 2 includes a filter element 201 and a ring seat 202;

[0093] The ring seat 202 is symmetrically fixed to the upper and lower ends of the filter element 201. A second ring groove 203 is provided on the outer side of the ring seat 202. A second sealing element 204 is installed on the ring seat 202 through the second ring groove 203.

[0094] When the filter assembly 2 is installed inside the inner cylinder 106, it is tightly fitted to the inner wall of the inner cylinder 106 through the second sealing element 204.

[0095] The top of the sealing base plate 301 is provided with a third annular groove 304 at the position where it is aligned with the annular air chamber 401 and the filter assembly 2. The sealing base plate 301 is equipped with a third sealing element 305 and a fourth sealing element 306 through the two third annular grooves 304 respectively. The third sealing element 305 and the fourth sealing element 306 are tightly fitted to the filter element 201 and the lower surface of the annular air chamber 401 respectively.

[0096] The bottom of the thickened inner liner 103 is provided with a first annular groove 104, and a first sealing element 6 is installed inside the first annular groove 104. The first sealing element 6 is tightly fitted to the top of the annular air chamber 401.

[0097] In this embodiment: each filter element 201 has a ring seat 202 fixed at both ends, and the second sealing element 204 on the ring seat 202 forms a radial seal with the inner wall of the inner cylinder 106, ensuring that the gas must pass through the filter element 201 and cannot bypass from the edge;

[0098] The sealing base plate 301 presses the lower surface of the filter element 201 and the annular air chamber 401 together with the third sealing element 305 and the fourth sealing element 306 to form an axial end face seal.

[0099] The thickened inner liner 103 presses against the upper surface of the annular air chamber 401 through the first sealing element 6 to form a seal;

[0100] Through the cooperation of multiple sealing components, the entire air path is strictly divided into an air inlet side (inner cavity of outer cylinder 101) and an air outlet side (middle cavity of inner cylinder 106), forcing the gas to flow through the filter element 201;

[0101] It should also be noted that the type of filter element 201 should be selected based on actual testing requirements.

[0102] For micro-water testing: a high-precision (1~2μm) and hydrophobic filter element should be selected, such as a sintered metal or polytetrafluoroethylene (PTFE) membrane filter element, to avoid adsorbing moisture;

[0103] If used for analysis of decomposition products: filter elements with extremely low adsorption of characteristic gases such as SO2, H2S, and CO should be selected, such as glass fiber or stainless steel mesh filter elements, and chemical inert coating treatment should be used if necessary.

[0104] For general particulate matter removal: ordinary cellulose or polypropylene filter cartridges can be selected, balancing cost and efficiency.

[0105] Please refer to this carefully. Figures 2 to 3 The disassembly auxiliary component pull rod 5 includes a top block 501, a pull rod 502, and a spherical block 503;

[0106] The top block 501 is installed on the top inner side of the inner cylinder 106, and the top ring seat 202 of the upper filter assembly 2 is tightly fitted with the top block 501;

[0107] The pull rod 502 is fixed to the bottom center of the top block 501 and extends downward to the inner side of the lower filter assembly 2; the spherical block 503 is fixed to the bottom of the pull rod 502.

[0108] The bottom of the spherical block 503 is at a higher level than the bottom of the filter component 2 below.

[0109] In this embodiment: when the filter element 201 needs to be replaced, unscrew the sealing base plate 301 and pull it down. The spherical block 503 at the lower end of the pull rod 502 is easy for personnel to grasp and apply downward pulling force. In this way, by applying downward pulling force to the spherical block 503, the sealing base plate 301 is pulled down and moved downward. The sealing base plate 301 pushes the upper filter component 2 down together, so that both filter components 2 can be pulled out at the same time, which is convenient for quick replacement.

[0110] Please refer to this carefully. Figure 2 , Figure 3 , Figure 5 The bottom horizontal height of the thickened inner lining 103 is level with the bottom horizontal height of the upper ventilation slot 107;

[0111] The outer side of the inner cylinder 106 is located in the middle area between the upper ventilation slot 107 and the lower ventilation slot 108, and the docking position of the two filter components 2 is located in the middle of this area.

[0112] The height between the bottom of the upper ventilation slot 107 and the bottom of the lower ventilation slot 108 is greater than the height of the piston ring block 405;

[0113] The inner and outer diameters of the piston ring block 405 are matched with the outer diameter of the inner cylinder 106 and the inner diameter of the rubber liner 403, respectively, and the outer diameter of the piston ring block 405 is larger than the inner diameter of the thickened liner 103.

[0114] In this embodiment: by making the bottom of the thickened inner liner 103 flush with the bottom of the upper ventilation slot 107, and by setting the outer diameter of the piston ring block to be larger than the inner diameter of the thickened inner liner 103, it can be ensured that the piston ring block 405 initially just closes the lower part of the upper ventilation slot 107, thus avoiding airflow short circuit.

[0115] There are no other slots between the upper and lower ventilation slots, which can prevent gas leakage in the middle area and ensure clear switching logic;

[0116] The height of the piston ring block 405 is less than the distance between the upper and lower ventilation slots, which ensures that the piston ring block 405 has sufficient stroke to pass through the highest protruding position of the inner protruding rubber bladder 404.

[0117] Please refer to this carefully. Figures 1 to 8 The outer cylinder 101, air inlet 102, thickened inner liner 103, connecting block 105, and inner cylinder 106 are all made of transparent plastic material.

[0118] The annular air chamber 401 is made of transparent plastic, and the rubber liner 403 and the inner protruding rubber bladder 404 are made of transparent rubber.

[0119] In this embodiment: the outer cylinder 101, the annular air chamber 401, the rubber liner 403, etc., are all made of transparent materials (plastic or rubber) to facilitate direct visual observation by operators.

[0120] Position of piston ring block 405 (to determine whether it has been switched to the lower filter element 201);

[0121] The degree of protrusion of the inner protruding rubber bladder 404 (to determine whether the blockage threshold has been triggered).

[0122] Color change of filter element 201 (to help determine the degree of pollution).

[0123] It enables low-cost, intuitive monitoring of blockage status without the need for additional electronic sensors.

[0124] The above description is merely a preferred embodiment of the present invention, but the scope of protection of the present invention is not limited thereto. Any equivalent substitutions or modifications made by those skilled in the art within the scope of the technology disclosed in the present invention, based on the technical solution and inventive concept of the present invention, should be covered within the scope of protection of the present invention.

Claims

1. An SF6 gas sampling and filtering device with anti-clogging function, comprising a gas cylinder assembly (1), a filter assembly (2), and a lower connecting assembly (3), characterized in that, The air cylinder assembly (1) includes an outer cylinder (101), an air inlet (102), a thickened inner liner (103), a connecting block (105), and an inner cylinder (106). The air inlet (102) is fixed to the top of the outer cylinder (101) and communicates with the inner cavity of the outer cylinder (101). The thickened inner liner (103) is integrally formed on the top of the inner side of the outer cylinder (101). The inner cylinder (106) is distributed in the middle of the inner cavity of the outer cylinder (101) and is fixedly connected to the inner wall of the connecting block (105) through the connecting block (105). The top of the inner cylinder (106) does not contact the top of the inner cavity of the outer cylinder (101). The filter assembly (2) is installed in the inner cavity of the inner cylinder (106), and two filter assemblies (2) are vertically installed inside the inner cylinder (106). The upper ventilation slot (107) and the lower ventilation slot (108) are respectively opened at the positions on the outer side of the inner cylinder (106) aligned with the two filter assemblies (2). The lower connecting assembly (3) includes a sealing base plate (301) and an air outlet (302); The sealing base plate (301) is threaded to the inner side of the bottom of the outer cylinder (101) and pressed against the bottom of the filter assembly (2) below. The air outlet (302) is fixed to the bottom of the sealing base plate (301) and communicates with the middle cavity of the filter assembly (2). A polygonal block (303) is fixed on the outside of the air outlet (302). The air inlet (102) is connected to the sampling device through an external pipeline, and the air outlet (302) is connected to the sampling device through an external pipeline. The pump of the sampling device generates suction to sample the sulfur hexafluoride gas inside the sampling device. The filter assembly (2) is used to filter the airflow passing through the cylinder structure composed of the air cylinder assembly (1) and the filter assembly (2). The inner cavity of the outer cylinder (101) is located between the thickened inner liner (103) and the top of the sealing bottom plate (301) and is also provided with a blockage indicator component (4). The blockage indicator component (4) is used to warn of the complete blockage of the upper filter component (2). The inner side of the inner cylinder (106) is also equipped with a disassembly auxiliary component pull rod (5), which is used to assist in the disassembly of the filter component (2).

2. The SF6 gas sampling and filtering device with anti-clogging function according to claim 1, characterized in that, The blockage indicator assembly (4) includes an annular air chamber (401), a rubber liner (403), an inner protruding rubber bladder (404), and a piston ring block (405). The annular air chamber (401) is installed between the bottom of the thickened inner liner (103) and the bottom of the sealing base plate (301) and is in contact with the inner wall of the outer cylinder (101); The rubber liner (403) is fixed to the inside of the annular air chamber (401), the inner protruding rubber bladder (404) is formed inside the rubber liner (403), and a through opening (402) is provided at the position where the annular air chamber (401) and the inner protruding rubber bladder (404) are aligned. The piston ring block (405) is sleeved between the outer side of the inner cylinder (106) and the inner side of the rubber liner (403), and the upper surface of the piston ring block (405) is in contact with the lower surface of the thickened liner (103), and the lower surface of the piston ring block (405) is in contact with the upper surface of the inner protruding rubber bladder (404). When the filter assembly (2) mentioned above is not completely blocked, the airflow flows along the channel formed by the air inlet (102), the upper ventilation slot (107) and the two filter assemblies (2) to the air outlet (302); When the filter assembly (2) mentioned above is completely blocked, the negative pressure in the space below the piston ring block (405) increases, causing the piston ring block (405) to move down and squeeze the inner protruding rubber bladder (404) to deform and shrink. Through the downward movement of the piston ring block (405), the airflow flows along the channel formed by the air inlet (102), the lower ventilation slot (108), and the lower filter assembly (2) to the air outlet (302).

3. The SF6 gas sampling and filtering device with anti-clogging function according to claim 2, characterized in that, Multiple inner protruding rubber bladders (404) are evenly arranged circumferentially, and high-pressure air is injected into the inner cavity of the annular air chamber (401).

4. The SF6 gas sampling and filtering device with anti-clogging function according to claim 2, characterized in that, An N-shaped spring (406) is installed on the inner side of the annular air chamber (401) at the through-hole (402). One side plate of the N-shaped spring (406) is bonded and fixed to the inner wall of the inner protruding rubber bladder (404), and the other side plate of the N-shaped spring (406) is attached to the inner wall of the outer ring of the annular air chamber (401).

5. An SF6 gas sampling and filtering device with anti-clogging function according to claim 1, characterized in that, The filter assembly (2) includes a filter element (201) and a ring seat (202); The ring seat (202) is symmetrically fixed to the upper and lower ends of the filter element (201). A second ring groove (203) is provided on the outer side of the ring seat (202). A second sealing element (204) is installed on the ring seat (202) through the second ring groove (203). When the filter assembly (2) is installed inside the inner cylinder (106), it is tightly fitted to the inner wall of the inner cylinder (106) through the second seal (204).

6. An SF6 gas sampling and filtering device with anti-clogging function according to claim 5, characterized in that, The disassembly auxiliary component pull rod (5) includes a top block (501), a pull rod (502), and a spherical block (503); The top block (501) is installed on the inner top of the inner cylinder (106), and the top ring seat (202) of the filter assembly (2) above is in close contact with the top block (501); The pull rod (502) is fixed to the middle of the bottom of the top block (501) and extends downward to the inner side of the filter assembly (2) below; the spherical block (503) is fixed to the bottom of the pull rod (502); The bottom horizontal height of the spherical block (503) is higher than the bottom horizontal height of the filter assembly (2) below.

7. An SF6 gas sampling and filtering device with anti-clogging function according to claim 1, characterized in that, The top of the sealing base plate (301) is provided with a third annular groove (304) at the position where it is aligned with the annular air chamber (401) and the filter assembly (2). The sealing base plate (301) is provided with a third sealing element (305) and a fourth sealing element (306) respectively through the two third annular grooves (304). The third sealing element (305) and the fourth sealing element (306) are tightly fitted to the filter element (201) and the lower surface of the annular air chamber (401) respectively. The thickened inner liner (103) has a first annular groove (104) at its bottom. A first sealing element (6) is installed inside the first annular groove (104). The first sealing element (6) is tightly fitted to the top of the annular air chamber (401).

8. An SF6 gas sampling and filtering device with anti-clogging function according to claim 1, characterized in that, The bottom horizontal height of the thickened inner lining (103) is level with the bottom horizontal height of the upper ventilation slot (107); The inner cylinder (106) has no slots in the middle area between the upper ventilation slot (107) and the lower ventilation slot (108) on its outer side, and the docking position of the two filter components (2) is located in the middle of this area. The height between the bottom of the upper ventilation slot (107) and the bottom of the lower ventilation slot (108) is greater than the height of the piston ring block (405); The inner and outer wall diameters of the piston ring block (405) are matched with the outer diameter of the inner cylinder (106) and the inner diameter of the rubber liner (403), respectively, and the outer diameter of the piston ring block (405) is greater than the inner diameter of the thickened liner (103).

9. An SF6 gas sampling and filtering device with anti-clogging function according to claim 2, characterized in that, The outer cylinder (101), air inlet (102), thickened inner liner (103), connecting block (105), and inner cylinder (106) are all made of transparent plastic material. The annular air chamber (401) is made of transparent plastic, and the rubber liner (403) and the inner protruding rubber bladder (404) are made of transparent rubber.

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