Suction filtration funnel and suction filtration device

Abstract

The suction filtration funnel comprises a funnel body, a clamping nut, a mesh plate and a cylinder, the suction filtration device comprises a suction filtration bottle, a vacuum pump and the suction filtration funnel, the funnel body comprises a funnel body and a neck part, a flow guide conical surface is arranged in the funnel body, the neck part is communicated with the bottom of the funnel body, a first step surface is arranged on the flow guide conical surface, and a second step surface is arranged on the neck part. The mesh plate is arranged on the first step face, the bottom of the clamping nut is turned inwards to form a second step face, internal threads are arranged on the inner side wall of the clamping nut, and external threads are arranged on the peripheral wall of the bottom of the cylinder. The suction filtration bottle is provided with a bottle opening and an extraction opening, the neck is inserted into the suction filtration bottle from the bottle opening, and the extraction opening is communicated with a vacuum pump through a vacuum pipe. After suction filtration is completed, the cylinder is screwed out, the funnel body is ejected out of the clamping nut by a certain distance, a solid sample source on the mesh plate can be completely exposed, a complete sample source filter cake can be conveniently taken out, the thickness and the distribution uniformity of the sample source are ensured, and the accuracy of an experimental result is improved.

Description

Technical Field

[0001] The utility model relates to the field of laboratory instruments, in particular to a suction filtration funnel and a suction filtration device. Background Art

[0002] In the analysis and measurement of radioactive samples, such as strontium-90, cesium-137, lead-210, etc., it is often necessary to use a suction funnel to separate the target object from the solid and liquid, and then transfer the solid sample to a measuring plate for detection. Since the existing suction funnel is generally an integrated structure, the filter cake in the funnel after filtration can only be scraped out little by little using a medicine spoon or a medicine shovel. The different sample source thickness and distribution uniformity of the radioactive sample have a relatively large impact on the result. Excessive operations make the operation inconvenient and increase the contact time with the sample source. It is also very easy to introduce impurities or cause sample source loss during the transfer process, which affects the experimental results. Utility Model Content

[0003] The main purpose of the utility model is to overcome the defects of the above-mentioned background technology and provide a suction filtration funnel and a suction filtration device.

[0004] To achieve the above-mentioned purpose, the utility model provides a suction filtration funnel, including a funnel body, a clamping nut, a mesh plate and a cylinder, the funnel body including a bucket body and a neck, the bucket body outer shell is a cylindrical structure, a guide cone is provided inside the bucket body, the neck is connected with the bottom of the bucket body, a first step surface is provided above the guide cone surface, the mesh plate is provided on the first step surface, a second step surface is provided inwardly at the bottom of the clamping nut, an inner side wall of the clamping nut is provided with an internal thread, and an outer peripheral wall of the bottom of the cylinder is provided with an external thread corresponding to the internal thread. After the funnel body is placed in the clamping nut, the outer bottom surface of the bucket body is matched and connected with the second step surface, and the bottom end of the cylinder abuts against the top edge of the mesh plate. When the cylinder is screwed into the clamping nut, the bucket body and the mesh plate are sealed and clamped. After the filtration is completed, screw out the cylinder and push the funnel body out of the clamping nut for a certain distance. The solid sample source on the mesh plate can be completely exposed, making it convenient to take out the complete sample source filter cake, ensuring the thickness and distribution uniformity of the sample source and increasing the accuracy of the experimental results. At the same time, it has the advantages of easy separation from the sample source, small sample source loss, rapid separation and accurate analysis of the sample source and reducing the contact time with the sample source. The detachable design makes cleaning more convenient and meets the use needs in other different industries and fields.

[0005] To further optimize the technical solution, the funnel body, the clamping nut and the cylinder are all made of stainless steel. Stainless steel is corrosion-resistant and not easy to deform, and can be repeatedly used after re-cleaning to improve durability.

[0006] To further optimize the technical solution, the clamping nut has a fine-tooth knurling on its exterior surface, and the upper area of ​​the cylinder has a coarse-tooth knurling on its exterior surface. The knurling increases friction and facilitates hand-held rotation and assembly.

[0007] To further optimize the technical solution, the thickness of the mesh plate is greater than or equal to the step height of the first step surface, so that after the mesh plate is placed on the first step surface, the bottom end of the cylinder can be pressed against the top surface of the mesh plate and / or the bucket body for clamping.

[0008] To further optimize the technical solution, a sealing groove is provided on the second step surface, and a sealing ring is provided in the sealing groove. The sealing ring is used to seal the gap between the second step surface and the bottom surface of the bucket body to prevent leakage of the sample solution and improve the sealing performance.

[0009] The utility model also proposes a suction filtration device, including a suction filtration bottle, a vacuum pump and the suction filtration funnel, wherein the suction filtration bottle is provided with a bottle mouth and a suction port, the neck of the bottom of the suction filtration funnel is inserted into the suction filtration bottle from the bottle mouth, and the suction port is connected to the vacuum pump through a vacuum tube. When in use, the sample solution is poured from the suction filtration funnel, and negative pressure is generated by the vacuum pump at the same time, so that different pressures are generated on the upper and lower sides of the mesh plate on the suction filtration funnel, and the sample solution flows to the suction filtration bottle below, while the solid sample source remains on the mesh plate, thereby achieving suction filtration, which is simple and convenient to use.

[0010] To further optimize the technical solution, a safety bottle is connected in series to the vacuum tube, so as to avoid direct discharge of the extracted waste gas to pollute the environment.

[0011] To further optimize the technical solution, the safety bottle is provided with an air inlet and an air outlet, the safety bottle is filled with a precipitant, the conduit connected to the air inlet extends into the precipitant liquid level, and the conduit connected to the air outlet is located above the precipitant liquid level. The radioactive substances in the extracted waste gas-liquid mixture are precipitated by the precipitant, thereby removing most of the radioactive substances and avoiding direct discharge of the radioactive substances.

[0012] To further optimize the technical solution, a rubber stopper is provided at the bottle mouth, a through hole is opened on the rubber stopper, and the neck is inserted into the interior of the suction bottle through the through hole.

[0013] To further optimize the technical solution, the inner diameter of the through hole is smaller than the outer diameter of the neck to achieve an interference fit.

[0014] The beneficial effects of the utility model include: by placing the funnel body into the clamping nut, the funnel body is stuck on the second step surface, and then the mesh plate is placed on the first step surface, and the mesh plate is covered with cut filter paper, the cylinder is rotated and screwed into the clamping nut to compress the mesh plate and the funnel body, and the assembly of the filtration funnel can be completed; after the filtration is completed, the cylinder is screwed out, and the funnel body is pushed out of the clamping nut for a certain distance, so that the solid sample source on the mesh plate can be completely exposed, which is convenient for taking out the complete sample source filter cake, ensuring the thickness and distribution uniformity of the sample source, and increasing the accuracy of the experimental results; and the contact time with the sample source is shortened during the transfer of the sample source, and the risk of introducing impurities or causing sample source loss during the transfer process is effectively reduced. The utility model has strong practicality and is suitable for large-scale promotion and use. BRIEF DESCRIPTION OF THE DRAWINGS

[0015] Figure 1 It is an exploded view of the suction filtration funnel in the embodiment of the utility model.

[0016] Figure 2 It is a schematic diagram of a clamping nut in an embodiment of the utility model.

[0017] Figure 3 It is a schematic diagram of the funnel body in the embodiment of the utility model.

[0018] Figure 4 It is a schematic diagram of a cylinder in an embodiment of the utility model.

[0019] Figure 5 It is an overall schematic diagram of the suction filtration device in the embodiment of the utility model.

[0020] Figure 6 It is a schematic diagram of a rubber stopper in an embodiment of the utility model.

[0021] Figure numerals: 1 funnel body; 101 funnel body; 1011 guide cone surface; 1012 first step surface; 102 neck; 2 clamping nut; 201 second step surface; 2011 sealing groove; 2012 sealing ring; 202 internal thread; 203 fine knurling; 3 mesh plate; 4 cylinder; 401 external thread; 402 coarse knurling; 5 filter bottle; 501 bottle mouth; 502 exhaust port; 503 rubber stopper; 5031 through hole; 6 vacuum pump; 7 vacuum tube; 8 safety bottle; 801 air inlet; 802 air outlet. DETAILED DESCRIPTION

[0022] In order to make the technical problems, technical solutions and beneficial effects to be solved by the embodiments of the present invention more clearly understood, the present invention is further described in detail below in conjunction with the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are only used to explain the present invention and are not intended to limit the present invention.

[0023] It should be noted that when a component is referred to as being "fixed to" or "disposed on" another component, it can be directly on the other component or indirectly on the other component. When an element is referred to as being "connected to" another element, it can be directly connected to the other element or indirectly connected to the other element. In addition, connection can be used for both fixing and circuit connection.

[0024] It should be understood that the terms "length", "width", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside", etc., indicating the orientation or position relationship, are based on the orientation or position relationship shown in the accompanying drawings, and are only for the convenience of describing the embodiments of the utility model and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as a limitation on the utility model.

[0025] In addition, the terms "first" and "second" are used for descriptive purposes only and should not be understood as indicating or implying relative importance or implicitly indicating the number of technical features indicated. Therefore, a feature defined as "first" or "second" may explicitly or implicitly include one or more of the features. In the description of the embodiments of the present utility model, the meaning of "multiple" is two or more, unless otherwise clearly and specifically defined.

[0026] See also Figures 1 to 4In one embodiment, a filtration funnel is disclosed, comprising a funnel body 1, a clamping nut 2, a mesh plate 3 and a cylinder 4. The funnel body 1 comprises a bucket body 101 and a neck 102. The bucket body 101 has a cylindrical outer shell. A flow guide cone 1011 is provided inside the bucket body 101. The neck 102 is connected to the bottom of the bucket body 101. A first step surface 1012 is provided above the flow guide cone surface 1011. The mesh plate 3 is provided on the first step surface 1012. The bottom end of the clamping nut 2 is inverted and provided with a second step surface 1012. Step surface 201, an internal thread 202 is provided on the inner wall of the clamping nut 2, and an external thread 401 corresponding to the internal thread 202 is provided on the outer peripheral wall of the bottom of the cylinder 4. After the funnel body 1 is placed into the clamping nut 2, the outer bottom surface of the bucket body 101 cooperates with the second step surface 201 for clamping to prevent the entire funnel body 1 from passing through the clamping nut 2, and the bottom end of the cylinder 4 abuts against the top edge of the mesh plate 3. When the cylinder 4 is screwed into the clamping nut 2, the bucket body 101 and the mesh plate 3 are sealed and clamped. In this embodiment, when in use, the funnel body 1 is placed in the clamping nut 2, the funnel body 101 is stuck on the second step surface 201, and then the mesh plate 3 is placed on the first step surface 1012, and the mesh plate 3 is covered with cut filter paper, and the bottom end of the cylinder 4 is rotated and screwed into the clamping nut 2 through the cooperation of the external thread 401 and the internal thread 202. After tightening, the bottom end of the cylinder 4 presses the mesh plate 3 and the funnel body 1, and then the sample solution to be filtered is poured from the top opening of the cylinder 4 for filtration. After the filtration is completed, the cylinder 4 is screwed out, and the funnel body 1 is removed from the The solid sample source on the mesh plate 3 can be completely exposed by pushing the clamping nut 2 out for a certain distance, so that the complete sample source filter cake can be taken out conveniently, ensuring the thickness and distribution uniformity of the sample source and increasing the accuracy of the experimental results. Moreover, the contact time with the sample source is shortened during the transfer process, and the risk of introducing impurities or causing sample source loss during the transfer process is effectively reduced. At the same time, each component can be disassembled and separated, so that each component can be cleaned thoroughly separately and adapted to various work scenarios, and meet the needs of specific tasks in other different industries and fields.

[0027] In a preferred embodiment, the funnel body 1, the clamping nut 2 and the cylinder 4 are all made of stainless steel. Specifically, the stainless steel grade can be 304 stainless steel or 316 stainless steel, etc. The stainless steel material has the characteristics of corrosion resistance and non-deformation, and the components can be repeatedly used after re-cleaning.

[0028] In a preferred embodiment, a fine-tooth knurling 203 is provided on the exterior surface of the clamping nut 2, and a coarse-tooth knurling 402 is provided on the exterior surface of the upper region of the cylinder 4. The knurling increases friction and facilitates hand-held rotation and assembly.

[0029] In the specific example, the thickness of the mesh plate 3 is greater than or equal to the step height of the first step surface 1012, so that after the mesh plate 3 is placed on the first step surface 1012, when the cylinder 4 and the clamping nut 2 are connected and tightened, the bottom end of the cylinder 4 can be pressed against the top surface of the mesh plate 3 and / or the bucket body 101 for clamping, thereby preventing the mesh plate 3 from shaking and affecting the filtration effect, and at the same time being able to press the mesh plate 3 and the bucket body 101.

[0030] In a preferred embodiment, a sealing groove 2011 is provided on the second step surface 201, and a sealing ring 2012 is provided in the sealing groove 2011. When the outer bottom surface of the bucket 101 is stuck on the second step surface 201, the gap between them is sealed by the sealing ring 2012 to prevent leakage of the sample solution.

[0031] See also Figure 5 and Figure 6 In one embodiment, a suction filtration device is also disclosed, which includes a suction filtration bottle 5, a vacuum pump 6 and the above-mentioned suction filtration funnel. The suction filtration bottle 5 is provided with a bottle mouth 501 and a suction port 502. The neck 102 at the bottom of the suction filtration funnel is inserted into the interior of the suction filtration bottle 5 from the bottle mouth 501. The suction port 502 is connected to the vacuum pump 6 through a vacuum tube 7. The vacuum pump 6 adopts a water ring vacuum pump. When in use, the sample solution is poured from the suction filtration funnel, and negative pressure is generated by the vacuum pump 6 at the same time, so that different pressures are generated on the upper and lower sides of the mesh plate 3 on the suction filtration funnel. The sample solution flows to the suction filtration bottle below, and the solid sample source remains on the mesh plate 3 to achieve suction filtration.

[0032] In a preferred embodiment, a safety bottle 8 is connected in series to the vacuum tube 7, and an air inlet 801 and an air outlet 802 are respectively provided on the safety bottle 8. A precipitant is contained in the safety bottle 8. Specifically, different precipitants are used according to different filtration radioactive sources, such as sodium hydroxide, hydrochloric acid, etc. The conduit connected at the air inlet 801 extends into the precipitant liquid surface, and the conduit connected at the air outlet 802 is located above the precipitant liquid surface. By adding the precipitant, the radioactive substances in the extracted waste gas-liquid mixture are precipitated, thereby removing most of the radioactive substances and avoiding direct discharge of the radioactive substances.

[0033] In a specific example, a rubber stopper 503 is provided at the bottle mouth 501, and a through hole 5031 is opened on the rubber stopper 503. The neck 102 is inserted into the interior of the filtration bottle 5 through the through hole 5031. The inner diameter of the through hole 5031 is smaller than the outer diameter of the neck 102 to achieve an interference fit. By providing the rubber stopper 503, the sealing between the neck 102 and the bottle mouth 501 is ensured to avoid affecting the negative pressure generated during filtration.

[0034] The above content is a further detailed description of the utility model in combination with specific / preferred embodiments, and it cannot be determined that the specific implementation of the utility model is limited to these descriptions. For ordinary technicians in the technical field to which the utility model belongs, without departing from the concept of the utility model, it can also make several substitutions or modifications to these described embodiments, and these substitutions or modifications should be regarded as belonging to the scope of protection of the utility model. In the description of this specification, the description of the reference terms "an embodiment", "some embodiments", "preferred embodiments", "examples", "specific examples" or "some examples" means that the specific features, structures, materials or characteristics described in combination with the embodiment or example are included in at least one embodiment or example of the utility model. In this specification, the schematic representation of the above terms does not necessarily target the same embodiment or example. Moreover, the specific features, structures, materials or characteristics described can be combined in any one or more embodiments or examples in a suitable manner. In the absence of mutual contradiction, those skilled in the art can combine and combine the different embodiments or examples described in this specification and the features of different embodiments or examples. Although the embodiments of the present invention and their advantages have been described in detail, it should be understood that various changes, substitutions and alterations may be made herein without departing from the scope of protection of the patent application.

Claims

1. A suction filtration funnel, characterized in that: It includes a funnel body, a clamping nut, a mesh plate and a cylinder. The funnel body includes a bucket body and a neck. The bucket body shell is a cylindrical structure. A guide cone is provided inside the bucket body. The neck is connected to the bottom of the bucket body. A first step surface is provided above the guide cone surface. The mesh plate is provided on the first step surface. A second step surface is provided inwardly at the bottom of the clamping nut. An inner wall of the clamping nut is provided with an internal thread. An outer peripheral wall of the bottom of the cylinder is provided with an external thread corresponding to the internal thread. After the funnel body is placed into the clamping nut, the outer bottom surface of the bucket body is matched and connected with the second step surface, and the bottom end of the cylinder abuts against the top edge of the mesh plate. When the cylinder is screwed into the clamping nut, the bucket body and the mesh plate are sealed and clamped.

2. The filtration funnel according to claim 1, characterized in that: The funnel body, the clamping nut and the cylinder are all made of stainless steel.

3. The filtration funnel according to claim 1, characterized in that: The exterior surface of the clamping nut is provided with fine-thread knurling, and the exterior surface of the upper area of ​​the cylinder is provided with coarse-thread knurling.

4. The filtration funnel according to claim 1, characterized in that: The thickness of the mesh plate is greater than or equal to the step height of the first step surface, so that after the mesh plate is placed on the first step surface, the bottom end of the cylinder can be pressed against the top end surface of the mesh plate and / or the bucket body for clamping.

5. The filtration funnel according to claim 1, characterized in that: A sealing groove is provided on the second step surface, and a sealing ring is provided in the sealing groove.

6. A suction filtration device, characterized in that: It comprises a suction bottle, a vacuum pump and the suction funnel according to any one of claims 1 to 5, wherein the suction bottle is provided with a bottle mouth and a suction port, the neck of the bottom of the suction funnel is inserted into the suction bottle from the bottle mouth, and the suction port is connected to the vacuum pump through a vacuum tube.

7. The suction filtration device according to claim 6, characterized in that: A safety bottle is connected in series on the vacuum tube.

8. The suction filtration device according to claim 7, characterized in that: The safety bottle is provided with an air inlet and an air outlet respectively. The safety bottle is filled with a precipitant. The conduit connected to the air inlet extends into the precipitant liquid surface, and the conduit connected to the air outlet is located above the precipitant liquid surface.

9. The filtration device according to claim 8, characterized in that A rubber stopper is provided at the bottle mouth, a through hole is provided on the rubber stopper, and the neck is inserted into the interior of the suction filtration bottle through the through hole.

10. The filtration device according to claim 9, characterized in that: The inner diameter of the through hole is smaller than the outer diameter of the neck, so as to achieve interference fit.

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