Pressure-reducing double-layer porous double filtering device

Abstract

The utility model relates to a pressure-reducing double-layer porous double filtering device, which effectively solves the technical problems of low efficiency and filter paper damage, a filtering cup body comprises an inner filtering cup body and an outer filtering cup body, a filtering cup body cavity is arranged between the inner filtering cup body and the outer filtering cup body, the outer filtering cup body is provided with a cup body upper nozzle and a cup body lower nozzle, and the inner filtering cup body and the outer filtering cup body are communicated with each other. The filtering funnel comprises an inner filtering funnel and an outer filtering funnel, a filtering funnel cavity is formed between the inner filtering funnel and the outer filtering funnel, a plurality of filtering funnel holes are formed in the side wall of the inner filtering funnel, and a funnel sealing gasket arranged in the filtering cup body cavity is detachably arranged between the filtering cup body and the filtering funnel; a filtering glass plate is arranged at the joint of the inner filtering cup body and the inner filtering funnel, a filtering funnel cavity is communicated with a funnel neck, a heat preservation pipe is detachably arranged on the outer side of the funnel neck in a sleeving mode, and the funnel neck is connected into a suction filtration bottle in an inserted mode. Double filtration of products is realized through the filtering glass plate and the filtering funnel hole, and the filtering efficiency is improved.

Description

Technical Field

[0001] The utility model relates to the technical field of filtration, in particular to a pressure-reducing double-layer porous double filtration device. Background Art

[0002] When our company conducts R&D experiments on oilfield chemicals, such as plugging agents, filtration reducers, viscosity reducers, lubricants, oil layer protectants and other product R&D experiments, we need to use filtering devices to achieve solid-liquid separation. Our company's products generally use ordinary filtration and vacuum filtration, which mainly depends on the product characteristics and experimental requirements. Ordinary filtration mainly uses filter holders, Buffet funnels, beakers, etc., and vacuum filtration mainly uses funnels, suction bottles, vacuum pumps, etc. The vacuum pump can speed up the filtration speed.

[0003] When our company performs product filtration in the laboratory, both ordinary filtration and vacuum filtration can only be performed once, and repeated operations are required, which is inefficient. For some products with low solubility, they need to be heated with temperature, otherwise the filtration speed is very slow, resulting in a long experimental cycle and low efficiency. During ordinary filtration, the long neck of the funnel needs to stick to the inner wall of the beaker, and the height also needs to be adjusted. The operation is cumbersome and troublesome, and the filtration speed is relatively slow. The filtrate with fine particles will be filtered more and more slowly at the end, and the insoluble matter squeezes the bottom of the conical funnel, and the filtrate is blocked and difficult to filter. During suction filtration, the filter paper is often damaged under the adsorption of the vacuum pump, causing liquid splashing during filtration of the funnel neck, and the pressure relief device draws away the splashing liquid, resulting in liquid loss and inaccurate experimental data.

[0004] On this basis, the utility model provides a pressure-reducing double-layer porous double-filtering device to solve the problem. Utility Model Content

[0005] In view of the above situation, in order to overcome the defects of the prior art, the utility model provides a pressure-reducing double-layer porous double filtration device. The utility model has a novel structure and ingenious conception, and effectively solves the technical problems of the existing filtration devices such as cumbersome operation, low efficiency, filter paper damage, and product liquid loss.

[0006] A decompression double-layer porous double filtering device, characterized in that it comprises a filter cup body, a filter funnel, a funnel neck, and a suction filter bottle, wherein the filter cup body comprises an inner filter cup body and an outer filter cup body that are coaxially fixedly connected, a filter cup body cavity is formed between the inner filter cup body and the outer filter cup body, an upper mouth and a lower mouth of the cup body that are connected to the filter cup body cavity are provided at the upper end and the lower end of the outer filter cup body, and a cup body sealing gasket is detachably installed at the upper end of the filter cup body cavity;

[0007] The filter funnel comprises a conical inner filter funnel and an outer filter funnel, a filter funnel cavity is formed between the inner filter funnel and the outer filter funnel, the inner filter funnel is integrally connected to the inner filter cup body, the outer filter funnel is integrally connected to the outer filter cup body, a plurality of filter funnel holes are formed on the side wall of the inner filter funnel, and a funnel sealing gasket placed in the filter cup body cavity is disassembled and placed between the filter cup body and the filter funnel;

[0008] A filter glass plate is placed at the junction of the inner filter cup body and the inner filter funnel, the filter funnel cavity is connected with a funnel neck, a heat preservation tube is detachably mounted on the outer side of the funnel neck, and the funnel neck is plugged into the suction filter bottle.

[0009] Preferably, the filtration bottle comprises an inner filtration bottle and an outer filtration bottle which are coaxially connected, a filtration bottle cavity is formed between the inner filtration bottle and the outer filtration bottle, a vacuum nozzle connected to the filtration bottle cavity is provided on the outer filtration bottle, and a plurality of vacuum holes are opened on the inner filtration bottle.

[0010] Preferably, the vacuum nozzle is placed below the vacuum hole.

[0011] Preferably, a filter bottle sealing gasket is detachably installed at the upper end of the filter bottle cavity, an isolation sealing gasket is installed in the filter bottle cavity, and an upper filter bottle mouth and a lower filter bottle mouth connected to the filter bottle cavity are provided below the isolation sealing gasket.

[0012] Preferably, a tray is provided at the placement of the cup body sealing gasket, the funnel sealing gasket and the suction flask sealing gasket.

[0013] Preferably, the lower end of the insulation tube is connected with a suction bottle plug which is inserted into the suction bottle, and the suction bottle plug is slidably mounted on the funnel neck.

[0014] Preferably, a funnel neck ring is movably mounted on the funnel neck, and a guide plate is fixed to the lower end of the funnel neck ring via a connecting rope.

[0015] Preferably, a funnel neck ring support is fixed on the funnel neck.

[0016] Preferably, the lower end of the inner suction filter bottle is provided with a lower nozzle of a guide device connected to the outside.

[0017] The utility model has the following technical effects.

[0018] 1. The utility model adopts the method of reduced pressure filtration to ensure the filtration speed. There is no need to adjust the filter funnel, just insert it directly. The operation is simple. Liquid or gas can be injected into the filter cup cavity to heat and keep the filtered product warm, thereby speeding up the filtration speed. At the same time, the cup body sealing gasket and the funnel sealing gasket are detachable and installed, which is convenient for cleaning the cavity after use. Double filtration of the product is achieved through the filter glass plate and the filter funnel hole, thereby improving the filtration efficiency.

[0019] 2. The utility model can inject cooling water through the suction bottle cavity to pre-cool and crystallize the filtered product, and can also reduce the adsorption of filter paper through reduced-pressure suction filtration to prevent the filter paper from being damaged under negative-pressure adsorption, and can ensure the reduced-pressure filtration of the filter funnel. At the same time, the liquid product will not be adsorbed into the reduced-pressure device. In the event that any liquid product enters the reduced-pressure device, it will not enter the inner suction filtration bottle again when flowing back, so as to prevent mixing with the liquid product and affecting the result.

[0020] 3. The utility model can ensure that the temperature of the filter funnel is constant as much as possible when it is heated and insulated through the insulation pipe, and at the same time cooperate with the guide plate to prevent the liquid from splashing and being absorbed into the pressure reducing device. 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 It is an overall three-dimensional schematic diagram of the utility model.

[0023] Figure 2 It is a sectional stereoscopic schematic diagram of the utility model.

[0024] Figure 3 It is a schematic sectional front view of the utility model.

[0025] Reference numerals:

[0026] 1-filter cup body, 2-filter funnel, 3-funnel neck, 4-suction filter bottle, 5-inner filter cup body, 6-outer filter cup body, 7-filter cup body cavity, 8-cup body with upper mouth, 9-cup body with lower mouth, 10-cup body sealing gasket, 11-inner filter funnel, 12-outer filter funnel, 13-filter funnel cavity, 14-filter funnel hole, 15-funnel sealing gasket, 16-filter glass plate, 17-insulation tube, 18-inner suction filter bottle, 19-outer suction filter bottle, 20-suction filter bottle cavity, 21-vacuum mouth, 22-vacuum hole, 23-suction filter bottle sealing gasket, 24-isolation sealing gasket, 25-suction filter bottle with upper mouth, 26-suction filter bottle with lower mouth, 27-card holder, 28-suction filter bottle plug, 29-funnel neck ring, 30-guide plate, 31-funnel neck ring support, 32-export tool lower mouth. DETAILED DESCRIPTION

[0027] The above and other technical contents, features and functions of the present invention are described in detail below with reference to the attached Figures 1 to 3 The details of the embodiments will be clearly presented. The contents mentioned in the following embodiments are all based on the drawings in the specification.

[0028] Various exemplary embodiments of the present utility model will be described below with reference to the accompanying drawings.

[0029] The utility model is a decompression double-layer porous double filtering device, which has decompression function, double-layer wall cavity function, and porous double filtering function. It mainly includes a filter cup body 1, a filter funnel 2, a funnel neck 3, a suction filter bottle 4, and a decompression device generally uses a vacuum pump with a catheter. The filter cup body 1, the filter funnel 2, the funnel neck 3, and the suction filter bottle 4 are made of high borosilicate glass, which is resistant to high temperature, strong and durable. The filter funnel 2 has a thick and uniform wall and is made of automated CNC equipment. The suction filter bottle 4 generally withstands a negative pressure of ≤0.06MPa, and the specifications are generally 125ml-20000ml. When using it, try to add a protective cover.

[0030] The filter cup body 1 and the filter funnel 2 are connected as one body. For the convenience of description, they are referred to as the filter cup body 1 and the filter funnel 2. The filter cup body 1 is placed above the filter funnel 2. The caliber above the filter funnel 2 is rounded and the inclined surface is smooth. The specification is generally 30-2000ml. The filter cup body 1 includes an inner filter cup body 5 of the inner layer and an outer filter cup body 6 of the outer layer. The two are coaxially fixed. A cavity is left between the inner filter cup body 5 and the outer filter cup body 6, which is called the filter cup body cavity 7. The fixing is in the filter The same material in the cup body cavity 7 is fixedly connected by 2-4 connectors. At this time, the top of the filter cup body cavity 7 is not sealed, while the top of the traditional double-layer filter funnel is sealed. The sealing position of the utility model is disassembled and sealed with a cup body sealing gasket 10. At the same time, an upper cup body mouth 9 and a lower cup body mouth 0 are respectively provided at the upper end of one side of the outer filter cup body 6 and the lower end of the symmetrical side. The cup body upper mouth 9 and the cup body lower mouth 0 are both pagoda heads with multiple hoops and clear edges and corners. The rubber tube is not easy to fall off when docked, and is sturdy and durable.

[0031] According to the characteristics of the filtered product, liquid, such as heated water, can be added into the filter cup body cavity 7 to achieve heating or low-temperature filtration. Most products require heating and heat preservation, so adding heated liquid is taken as an example.

[0032] When the liquid product needs to be heated and filtered, the pre-prepared constant temperature liquid, taking heated water as an example, is introduced through the upper mouth 8 of the cup body and enters the filter cup body cavity 7. After use, it flows out from the lower mouth 9 of the cup body. It can also be connected to the outside to form a circulating flow. In addition, in addition to water, insulating gas can also be introduced for insulation, such as water vapor. The upper mouth 8 of the cup body and the lower mouth 9 of the cup body are mainly used to introduce insulating liquid and gas. When cleaning, since it is an experimental instrument, it is necessary to keep the instrument clean and tidy after each use. It is inconvenient to clean only through the upper mouth 8 and the lower mouth 9 of the cup body. Therefore, at this time, it is more convenient and quick to clean with the cup body sealing gasket 10. Of course, when water is introduced, you can also choose to add and discharge from the cup body sealing gasket 10, but the discharge must wait until the experiment is completely completed.

[0033] The filter funnel 2 is conical, including a conical inner filter funnel 11 and an outer filter funnel 12. The inner filter funnel 11 is integrally connected to the inner filter cup body 5, and the outer filter funnel 12 is integrally connected to the outer filter cup body 6. A plurality of filter funnel holes 14 are provided on the side wall of the inner filter funnel 11. The bottom end of the inner filter funnel 11 is in the shape of a boss. The lowest filter funnel hole 14 is slightly lower than the bottom end of the inner filter funnel 11 to prevent liquid from accumulating at the bottom of the inner filter funnel 11. A filter funnel cavity 13 is formed between the inner filter funnel 11 and the outer filter funnel 12. The filtered liquid enters the inner filter cup body 5 and then enters the inner filter funnel 11, and then enters the filter funnel cavity 13 from the filter funnel hole 14. A funnel sealing gasket 15 is placed between the filter cup cavity 7 and the filter funnel cavity 13 for sealing and disassembly.

[0034] The funnel sealing gasket 15 is used to isolate the filter cup body cavity 7 and the filter funnel cavity 13, so that no matter whether water or gas is passed into the filter cup body cavity 13, it cannot enter the filter funnel cavity 13. The filter funnel cavity 13 is used to filter the product. When the experiment is over, the disassembled funnel sealing gasket 15 is convenient for cleaning the filter funnel cavity 13 to ensure that the filter funnel cavity 13 is clean and tidy.

[0035] A filter glass plate 16 is placed at the junction of the inner filter cup body 5 and the inner filter funnel 11. A plurality of glass plate holes are opened on the filter glass plate 16. The holes are laser punched, and the holes are fine and evenly distributed. This is the first filtration. When filtering, filter paper is used. The liquid after the first filtration enters the inner filter funnel 11. Filter paper is placed on the filter funnel hole 14. This is the second filtration. The inner filter funnel 11 is not connected to the funnel neck 3. The filter funnel cavity 13 is connected to the funnel neck 3. The product after the second filtration flows from the funnel neck 3 into the suction bottle 4.

[0036] In addition to performing a second filtration, the filter funnel hole 14 can also improve the permeability of the product and increase the filtration speed. Moreover, when performing reduced pressure filtration, the filter paper cannot be directly affected, thereby protecting the filter paper and preventing the filter paper from being damaged by negative pressure.

[0037] The outer side of the funnel neck 3 is detachably sleeved with an insulation tube 17. When water needs to be heated and insulated, the insulation tube 17 is sleeved on the outer side of the funnel neck to ensure the insulation of the upper filter cup body 1 and the filter funnel 2 as much as possible and keep the water temperature consistent.

[0038] The lower end of the funnel neck 3 is inserted into the suction filtration bottle 4, and the lower end of the funnel neck 3 is a pointed funnel pipe mouth, which is integrally formed.

[0039] Furthermore, the matching suction bottle 4 includes an inner suction bottle 18 and an outer suction bottle 19 which are coaxially fixed. The inner suction bottle 18 and the outer suction bottle 19 are fixed by the bottom, and a suction bottle cavity 20 is formed between the inner suction bottle 18 and the outer suction bottle 19. This suction bottle 4 has four functions. One is to pass cooling water to pre-cool and crystallize the filtered product. The second is to connect the pressure reducing device to prevent the negative pressure from directly acting on the filter paper and causing negative pressure damage. The third is to prevent the splashing liquid from being adsorbed into the pressure reducing device. The fourth is to prevent the liquid from flowing back into the suction bottle in case there is liquid in the pressure reducing air pipe and affecting the product results.

[0040] A vacuum nozzle 21 connected to the filter bottle cavity 20 is provided above the outer filter bottle 4. The vacuum nozzle 21 is a pagoda head with multiple hoops and clear edges and corners. The rubber tube is not easy to fall off when docked, and it is sturdy and durable. A plurality of vacuum holes 22 are opened on the side wall of the inner filter bottle 18. When decompression filtration is performed, the decompression catheter is plugged into the vacuum nozzle 21, and the negative pressure enters the inner filter bottle 18 through the filter bottle cavity 20 to perform negative pressure filtration on the filtered product, thereby increasing the filtration speed. There are a plurality of vacuum holes 22, which are evenly distributed to ensure consistent negative pressure in all directions.

[0041] Furthermore, when performing vacuum filtration, the height of the vacuum nozzle 21 is placed below the vacuum hole 22, firstly to prevent the splashing liquid from being adsorbed, and secondly to prevent the liquid in the vacuum conduit from flowing back to the inner filtration bottle 18 along the wall.

[0042] Furthermore, a filtration sealing gasket 23 is removably installed at the upper end of the filtration bottle cavity 20, and an isolation sealing gasket 24 is installed in the filtration bottle cavity 20. Since the upper and lower diameters of the filtration bottle 4 are different, the isolation sealing gasket 24 must be made of soft material and have good sealing performance. At the same time, the upper surface is provided with a hook and ring for easy disassembly, and below the isolation sealing gasket 24 is provided an upper mouth 25 of the filtration bottle connected to the filtration bottle cavity 20 and a lower mouth 26 of the filtration bottle provided on a symmetrical side. The upper mouth 25 of the filtration bottle and the lower mouth 26 of the filtration bottle are symmetrically arranged and are both placed below the isolation sealing gasket 24. They are pagoda heads with multiple hoops and clear edges and corners. The rubber tube is not easy to fall off when docked, and is sturdy and durable.

[0043] The isolation sealing gasket 24 isolates the suction bottle cavity 20 into a decompression chamber at the upper end and a cooling chamber at the lower end. The decompression chamber is used to connect the decompression device, and the cooling chamber is used to pass cooling water or cooling gas. When the experiment is over, the isolation sealing gasket 24 is removed to facilitate the cleaning of the entire suction bottle 4 and keep the suction bottle 4 clean and tidy.

[0044] Furthermore, the cup body sealing gasket 10, the funnel sealing gasket 15, and the isolation sealing gasket 24 are used in total. In order to ensure the convenience during installation, a support or blocking tray 27 is provided at the installation position so that it can be limited after being placed in this position. The tray 27 can be integrally formed or subsequently welded.

[0045] Furthermore, a suction bottle plug 28 is fixedly connected to the lower end of the insulation tube 17. The suction bottle plug 28 is used to seal the upper diameter of the inner suction bottle 18 and to seal the inner suction bottle 18 during filtration. The insulation tube 17 is used to insulate the funnel neck 3. The suction bottle plug 28 can slide on the funnel neck 3 following the insulation tube 17 to adjust its position on the funnel neck 3.

[0046] Furthermore, when using the beaker operating specifications, the funnel neck needs to stick to the side wall of the beaker, firstly to prevent dangerous splashing out, and secondly to prevent splashing onto the side wall and affecting the experimental results. Although the suction filtration bottle can prevent splashing out very well, splashing onto the side wall and adhering to the side wall will still affect the experimental results. More importantly, after splashing out, if it is adsorbed by reduced pressure, it will affect the experimental results, and directly affect the suction filtration product after diversion. Therefore, a funnel neck ring 29 is movably mounted on the funnel neck 3, and a guide plate 30 is fixed to the lower end of the funnel neck ring 29 through a connecting rope. The funnel neck ring 29 is mounted on the funnel neck 3, and the guide plate 30 is placed into the inner suction filtration bottle 18 along the inner suction filtration bottle 18. During filtration, the filtrate product flows down along the guide plate 30 to prevent splashing as much as possible.

[0047] Furthermore, in order to stabilize the funnel neck ring 29, a funnel neck ring support 31 is fixed or integrated on the funnel neck 3, so that the guide plate 30 is placed below the funnel neck 3. The funnel ring 29 is a soft sleeve, which can be passed with force during installation and will not fall off in a natural state.

[0048] Furthermore, when the filtration capacity is relatively large and continuous filtration is required, a lower nozzle 32 of the outlet tool is provided at the lower end of the inner suction filter bottle 18. The lower nozzle 32 is a pagoda head with multiple hoops and clear edges and corners. The rubber tube is not easy to fall off when docked, and it is sturdy and durable. The lower nozzle 32 of the outlet tool passes through the suction bottle cavity 20 and the outer suction filter bottle 19, and can be exported while filtering through the outlet pipe.

[0049] Working principle:

[0050] Prepare the filter cup body 1, filter funnel 2, funnel neck 3, suction bottle 4 and other accessories, clean and prepare them, place the isolation seal 24 pad into the suction bottle cavity 20, place the suction bottle sealing pad 23 into the upper end of the suction bottle cavity 20, place the funnel sealing pad 15 into the filter funnel cavity 13, place the cup body sealing pad 10 into the filter cup body 7, put the insulation tube 17 into the funnel neck 3, put the funnel neck ring 29 into the funnel neck 3, slowly put the guide plate 30 into the inner suction bottle 18, slide the insulation tube 17, and place the suction bottle plug 28 into the inner suction bottle 18 caliber to ensure that the suction bottle 4, filter cup body 1, filter funnel 2, and funnel neck 3 are placed stably and positively.

[0051] Heating and heat preservation water or gas is introduced through the upper mouth 8 of the cup body, and cooling water or gas is introduced through the upper mouth 25 of the suction bottle. A circulation can also be formed, and the air pipe and the vacuum pump are connected through the vacuum mouth 21.

[0052] Place the filter paper close to the filter hole 14 of the funnel, put the filter glass plate 16 into the inner filter cup 5, and place the filter paper close to the filter glass plate 16. Make preparations before filtering.

[0053] Put the filtered liquid into the inner filter cup 5. The liquid first passes through the first filter glass plate 16 to filter into the inner filter funnel 11, then passes through the second filter funnel hole 14 to enter the filter funnel cavity 13, and then flows along the funnel neck 3 and the guide plate 30 to enter the inner suction filter bottle 18. If the filtered liquid is large, the lower nozzle 32 of the outlet device can be connected to the outlet tube in advance.

[0054] Although the content of the utility model has been described in detail through the above preferred embodiments, it should be recognized that the above description should not be considered as a limitation of the utility model. After reading the above content, various modifications and substitutions of the utility model will be obvious to those skilled in the art. Therefore, the protection scope of the utility model should be limited by the attached claims.

Claims

1. A double-layer porous double-filtration device with reduced pressure, characterized in that: The invention comprises a filter cup body (1), a filter funnel (2), a funnel neck (3), and a suction filter bottle (4); the filter cup body (1) comprises an inner filter cup body (5) and an outer filter cup body (6) which are coaxially fixedly connected; a filter cup body cavity (7) is formed between the inner filter cup body (5) and the outer filter cup body (6); an upper mouth (8) and a lower mouth (9) of the cup body connected to the filter cup body cavity (7) are provided at the upper end and the lower end of the outer filter cup body (6); a cup body sealing gasket (10) is detachably mounted at the upper end of the filter cup body cavity (7); The filter funnel (2) comprises a conical inner filter funnel (11) and an outer filter funnel (12); a filter funnel cavity (13) is formed between the inner filter funnel (11) and the outer filter funnel (12); the inner filter funnel (11) and the inner filter cup body (5) are integrally connected; the outer filter funnel (12) and the outer filter cup body (6) are integrally connected; a plurality of filter funnel holes (14) are formed on the side wall of the inner filter funnel (11); and a funnel sealing gasket (15) disposed in the filter cup body cavity (7) is disassembled and placed between the filter cup body (1) and the filter funnel (2); A filter glass plate (16) is placed at the junction of the inner filter cup body (5) and the inner filter funnel (11); the filter funnel cavity (13) is connected to a funnel neck (3); a heat preservation tube (17) is detachably mounted on the outside of the funnel neck (3); and the funnel neck (3) is plugged into a suction filtration bottle (4).

2. A decompression double-layer porous double-filtration device according to claim 1, characterized in that: The suction filter bottle (4) comprises an inner suction filter bottle (18) and an outer suction filter bottle (19) which are coaxially connected, a suction filter bottle cavity (20) is formed between the inner suction filter bottle (18) and the outer suction filter bottle (19), a vacuum nozzle (21) which is in communication with the suction filter bottle cavity (20) is provided on the outer suction filter bottle (19), and a plurality of vacuum holes (22) are provided on the inner suction filter bottle (18).

3. A decompression double-layer porous double-filtration device according to claim 2, characterized in that: The vacuum nozzle (21) is placed below the vacuum hole (22).

4. A decompression double-layer porous double-filtration device according to claim 3, characterized in that: A filter bottle sealing gasket (23) is detachably mounted on the upper end of the filter bottle cavity (20), an isolation sealing gasket (24) is installed in the filter bottle cavity (20), and a filter bottle upper mouth (25) and a filter bottle lower mouth (26) which are connected to the filter bottle cavity (20) are provided below the isolation sealing gasket (24).

5. A decompression double-layer porous double-filtration device according to claim 4, characterized in that: A tray (27) is provided at the placement of the cup body sealing gasket (10), the funnel sealing gasket (15), and the suction flask sealing gasket (23).

6. The decompression double-layer porous double-filtration device according to claim 1, characterized in that: The lower end of the heat preservation tube (17) is connected to a suction filtration bottle plug (28) which is inserted into the suction filtration bottle, and the suction filtration bottle plug (28) is slidably mounted on the funnel neck (3).

7. The decompression double-layer porous double-filtration device according to claim 1, characterized in that: A funnel neck ring (29) is movably mounted on the funnel neck (3), and a guide plate (30) is fixed to the lower end of the funnel neck ring (29) via a connecting rope.

8. The decompression double-layer porous double-filtration device according to claim 1, characterized in that: A funnel neck ring support (31) is fixed on the funnel neck (3).

9. The decompression double-layer porous double-filtration device according to claim 2, characterized in that: The lower end of the inner suction filter bottle (18) is provided with a lower outlet nozzle (32) for communicating with the outside world.

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