A screw top buchner funnel filtration device

Abstract

The utility model relates to the technical field of laboratory equipment, especially a screw mouth Bunsen funnel filtering device, including filter mechanism and being used for vacuum filtration separation solid -liquid mixture, filter mechanism includes: main part subassembly, including the funnel that sets up on the upper end of adapter, the inner wall of funnel is opened with internal thread, the lower end inner wall of adapter is opened with GL45 thread and is used for adapting connection GL45 screw mouth reagent bottle, the side end of adapter is fixed with the air suction nozzle of intercommunication and is used for connecting vacuum pump, and the inside fixed support plate of funnel, filter membrane, set up on the support plate and be used for retaining solid material in the process of vacuum filtration, clamping assembly, set up on the main part subassembly and be used for the filter membrane pressure tight fixing, realized the integration of filtering and storage function, saved the cumbersome step of transferring filtrate from traditional suction filter bottle, greatly promoted the operation efficiency and reduced the sample pollution risk.

Description

Technical Field

[0001] This utility model relates to the field of laboratory equipment technology, specifically a screw-type Buchner funnel filter device. Background Technology

[0002] In laboratories for chemical, biological, and environmental analysis, vacuum filtration is an important procedure for separating solid-liquid mixtures. Vacuum filtration flasks are typically thick-walled glass bottles with ground glass joints, and are used with Buchner funnels for filtration. According to publication number CN220004077U, a filtration flask with a detachable and replaceable suction port is disclosed. This technology discloses that it includes: a bottle mouth at the top of the filtration flask body and a round hole at the neck; a suction port for connecting a vacuum tube to connect the filtration flask and a vacuum pump; the suction port consists of a tail section and a head section, the free end of the tail section is provided with a circular end cap, and the outer wall of the tail section is threaded to match a fastening screw; the head section is used to connect the vacuum tube; the suction port... The filter bottle body is connected to the suction port through a round hole, and the annular end cap of the suction port is inside the filter bottle body; a rubber sealing gasket is fitted between the annular end cap and the inner wall of the filter bottle body; the tail section of the suction port on the outer wall of the filter bottle body is engaged with a fastening screw, and another rubber sealing gasket and a plastic gasket are sequentially fitted on the tail section between the outer wall of the filter bottle body and the fastening screw. These technical solutions have the technical effect of "the suction bottle can be disassembled and the suction port can be replaced". Existing vacuum filtration flasks require the use of Buchner funnels, and after filtration, the filtrate must be transferred to a storage bottle (such as a GL45 screw-top reagent bottle). This process not only increases the number of steps and time costs, but also introduces potential contamination risks. Furthermore, although there are dedicated GL45 screw-top reagent bottles on the market that meet the pressure resistance requirements of high vacuum filtration, the lack of a conversion interface that can directly connect such reagent bottles to standard ground glass Buchner funnels forces laboratories to purchase dedicated vacuum filtration flasks, resulting in increased equipment costs and wasted storage space. Utility Model Content

[0003] To address the shortcomings of existing technologies, this invention provides a screw-top Buchner funnel filtration device that integrates filtration and storage functions, eliminating the cumbersome steps of transferring filtrate from a traditional vacuum filtration flask, greatly improving operational efficiency and reducing the risk of sample contamination.

[0004] To achieve the above objectives, this utility model provides the following technical solution: a screw-type Buchner funnel filtration device, comprising a filtration mechanism and used for vacuum filtration and separation of solid-liquid mixtures, wherein the filtration mechanism comprises: The main components include a funnel at the upper end of the adapter, an internal thread on the inner wall of the funnel, a GL45 thread on the inner wall of the lower end of the adapter for connecting a GL45 screw-type reagent bottle, a suction nozzle fixed to the side end of the adapter for connecting a vacuum pump, and a support plate fixed inside the funnel. A filter membrane is mounted on a support plate and is used to retain solid substances during vacuum filtration. A clamping assembly is mounted on the main body assembly and is used to press and fix the filter membrane.

[0005] Preferably, the clamping assembly includes a pressure ring installed at the upper end of the inside of the funnel, the outer wall of the pressure ring having an external thread that engages with an internal thread.

[0006] Preferably, the main component further includes a ring seat fixed in a ring shape to the inner wall of the adapter, and its position is above the GL45 thread, with a sealing gasket fixed at the lower end of the ring seat.

[0007] Preferably, the main body component further includes a bevel formed between the top of the ring seat and the inner wall of the adapter.

[0008] Preferably, the filtration mechanism further includes a pressure limiting valve installed on the suction nozzle, the threshold pressure of which is set to 0.8 bar.

[0009] Preferably, the adapter and the support plate are both made of PTFE, and the sealing gasket is made of silicone.

[0010] Beneficial effects

[0011] This invention provides a screw-type Buchner funnel filter device. Compared with the prior art, it has the following advantages: 1. This device integrates an adapter for standard GL45 screw-top reagent bottles, a support plate for holding the filter membrane, and a vacuum passage with a suction nozzle. During use, the GL45 thread at the lower end of the adapter is reliably connected to the pressure-resistant GL45 reagent bottle. The filter membrane is placed on the support plate and clamped in place to ensure a seal. When the vacuum pump draws air through the suction nozzle, a negative pressure is generated inside the device. Under the combined action of gravity and pressure difference, the liquid in the solid-liquid mixture to be filtered passes through the filter membrane into the reagent bottle below, while the solid is retained on the surface of the filter membrane. This integration of filtration and storage functions eliminates the cumbersome steps of transferring filtrate from traditional vacuum filtration bottles, greatly improving operational efficiency and reducing the risk of sample contamination.

[0012] 2. By rotating the pressure ring, the external thread on its outer wall engages with the internal thread on the inner wall of the funnel, driving the pressure ring to move smoothly downward along the axial direction of the funnel, thereby uniformly pressing the filter membrane placed on the support plate; ensuring that a uniform and reliable surface seal is formed between the edge of the filter membrane and the support plate or related sealing surface, effectively preventing liquid leakage from the edge of the filter membrane during the filtration process, and ensuring the effectiveness of filtration. Attached Figure Description

[0013] Figure 1 This is a three-dimensional structural diagram of the present invention; Figure 2 This is a schematic diagram of the disassembled structure of this utility model; Figure 3 This is a cross-sectional structural diagram of the present invention; Figure 4 This is a cross-sectional structural diagram of the main component in this utility model.

[0014] In the diagram: 1. Filtering mechanism; 11. Main component; 111. Adapter; 112. Funnel; 113. Internal thread; 114. GL45 thread; 115. Suction nozzle; 116. Support plate; 117. Ring seat; 118. Sealing gasket; 119. Inclined surface; 12. Filter membrane; 13. Clamping assembly; 131. Pressure ring; 132. External thread; 14. Pressure relief valve. Detailed Implementation

[0015] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the protection scope of the present utility model.

[0016] Please see Figure 1 - Figure 4 This utility model provides a technical solution: a screw-type Buchner funnel filter device, including a filter mechanism 1 and used for vacuum filtration and separation of solid-liquid mixtures, wherein the filter mechanism 1 includes: The main component 11 includes a funnel 112 at the upper end of the adapter 111, an internal thread 113 on the inner wall of the funnel 112, a GL45 thread 114 on the inner wall of the lower end of the adapter 111 for connecting to a GL45 screw-type reagent bottle, a suction nozzle 115 fixedly connected to the side end of the adapter 111 for connecting to a vacuum pump, and a support plate 116 fixed inside the funnel 112. The filter membrane 12 is disposed on the support plate 116 and is used to retain solid substances during the vacuum filtration process; The clamping assembly 13 is disposed on the main body assembly 11 and is used to press and fix the filter membrane 12.

[0017] In this embodiment, the adapter 111 for a standard GL45 screw-top reagent bottle, the support plate 116 for holding the filter membrane 12, and the vacuum passage with the suction nozzle 115 are integrated into one unit. In use, the GL45 thread 114 at the lower end of the adapter 111 is reliably connected to the pressure-resistant GL45 reagent bottle, the filter membrane 12 is placed on the support plate 116, and it is pressed and fixed by the clamping assembly 13 to ensure a seal. When the vacuum pump draws air through the suction nozzle 115, a negative pressure is generated inside the device. Under the combined action of gravity and pressure difference, the liquid of the solid-liquid mixture to be filtered passes through the filter membrane 12 and enters the reagent bottle below, while the solid is trapped on the surface of the filter membrane 12. This integrates filtration and storage functions, eliminates the cumbersome steps of transferring filtrate from a traditional vacuum filtration bottle, greatly improves operational efficiency, and reduces the risk of sample contamination.

[0018] Specifically, the clamping assembly 13 includes a pressure ring 131 installed inside the upper end of the funnel 112. The outer wall of the pressure ring 131 has an external thread 132 that engages with the internal thread 113.

[0019] In this embodiment, by rotating the pressure ring 131, the external thread 132 on its outer wall engages with the internal thread 113 on the inner wall of the funnel 112, driving the pressure ring 131 to move smoothly downward along the axial direction of the funnel 112, thereby uniformly pressing the filter membrane 12 placed on the support plate 116; ensuring that a uniform and reliable surface seal is formed between the edge of the filter membrane 12 and the support plate 116 or related sealing surfaces, effectively preventing liquid leakage from the edge of the filter membrane during filtration, and ensuring the effectiveness of filtration.

[0020] Specifically, the main component 11 also includes a ring seat 117 that is fixed in a ring shape to the inner wall of the adapter 111, and its position is above the GL45 thread 114. A sealing gasket 118 is fixed inside the lower end of the ring seat 117.

[0021] In this embodiment, when the GL45 screw-top reagent bottle is screwed into the GL45 thread 114 at the lower end of the adapter 111 and tightened, the bottle mouth end face will press against the sealing gasket 118 at the lower end of the ring seat 117; the sealing gasket 118 undergoes elastic deformation, tightly filling the microscopic gap between the bottle mouth end face and the ring seat 117, thereby forming an airtight seal.

[0022] Specifically, the main component 11 also includes a slope 119 formed between the top of the ring seat 117 and the inner wall of the adapter 111.

[0023] In this embodiment, during the vacuum filtration process, after the liquid passes through the filter membrane 12 and falls, the inclined surface 119 acts as a smooth transition guide surface, which can effectively guide the liquid flow to smoothly turn and flow into the central area of ​​the reagent bottle below.

[0024] Specifically, the filter mechanism 1 also includes a pressure relief valve 14 installed on the suction nozzle 115, the threshold pressure of which is set to 0.8 bar.

[0025] In this embodiment, the pressure limiting valve 14 monitors the vacuum pressure during the filtration process in real time. When the vacuum pump continues to pump air and the system pressure difference reaches its preset threshold, the pressure limiting valve 14 opens to adjust and prevent the vacuum degree in the system from rising further by introducing an appropriate amount of external air, thereby stabilizing the pressure difference within a safe range.

[0026] Specifically, the adapter 111 and the support plate 116 are both made of PTFE, and the sealing gasket 118 is made of silicone.

[0027] In this embodiment, the PTFE material, due to its excellent chemical inertness, can resist the corrosion of various chemicals, including strong acids, strong alkalis, and organic solvents, ensuring that the adapter 111 and the support plate 116 remain stable when in contact with complex samples, without participating in reactions or releasing contaminants; at the same time, the silicone sealing gasket 118, with its good elasticity and compression resilience, can generate effective deformation when squeezed by the bottle mouth end face, tightly filling the tiny unevenness between the contact surfaces, thereby achieving a reliable airtight seal.

[0028] The working principle and usage process of this utility model are as follows: First, the GL45 thread 114 at the lower end of the adapter 111 is screwed tightly onto a pressure-resistant GL45 screw-top reagent bottle (such as a DURAN® pressure plus+ bottle). At this time, the bottle mouth end of the reagent bottle presses upward against the silicone sealing gasket 118 at the lower end of the ring seat 117, causing it to undergo elastic deformation and forming a reliable airtight seal. Next, a filter membrane 12 is placed flat on the PTFE support plate 116 fixed inside the funnel 112. Then, by rotating the pressure ring 131 of the clamping assembly 13, its external thread 132 engages with the internal thread 113 of the inner wall of the funnel 112, driving the pressure ring 131 to move smoothly downward, thereby evenly pressing the filter membrane 12 onto the support plate 116 to ensure its edge seal. Then, connect the vacuum pump to the pressure limiting valve 14 on the suction nozzle 115 at the side of the adapter 111 via a pipeline. Start the vacuum pump, and a negative pressure is generated in the system. After the solid-liquid mixture to be filtered is poured in, under the action of gravity and pressure difference, the liquid passes through the filter membrane 12 and flows smoothly along the inclined surface 119 at the top of the ring seat 117, directly into the reagent bottle below, while the solid matter is trapped on the surface of the filter membrane 12. Throughout the process, the pressure limiting valve 14 continuously monitors the system pressure. If the vacuum is too high and approaches the danger value, it will automatically intervene to adjust and ensure system safety. After filtration, there is no need to transfer the liquid. The GL45 reagent bottle below can be directly unscrewed and sealed for storage.

[0029] It should be noted that, in this document, relational terms such as "first" and "second" are used only to distinguish one entity or operation from another, and do not necessarily require or imply any such actual relationship or order between these entities or operations. Furthermore, the terms "comprising," "including," or any other variations thereof are intended to cover non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements includes not only those elements but also other elements not expressly listed, or elements inherent to such process, method, article, or apparatus.

[0030] Although embodiments of the present invention have been shown and described, it will be understood by those skilled in the art that various changes, modifications, substitutions and alterations can be made to these embodiments without departing from the principles and spirit of the present invention, the scope of which is defined by the appended claims and their equivalents.

Claims

1. A screw-type Buchner funnel filter device, characterized in that: Includes a filtration mechanism (1) for vacuum filtration and separation of solid-liquid mixtures, the filtration mechanism (1) comprising: The main component (11) includes a funnel (112) set at the upper end of the adapter (111), an internal thread (113) on the inner wall of the funnel (112), a GL45 thread (114) on the lower inner wall of the adapter (111) for connecting to a GL45 screw-top reagent bottle, a suction nozzle (115) fixed to the side end of the adapter (111) for connecting to a vacuum pump, and a support plate (116) fixed inside the funnel (112). A filter membrane (12) is disposed on a support plate (116) and is used to retain solid matter during vacuum filtration. The clamping assembly (13) is disposed on the main body assembly (11) and is used to press and fix the filter membrane (12).

2. The screw-type Buchner funnel filter device according to claim 1, characterized in that: The clamping assembly (13) includes a pressure ring (131) installed inside the upper end of the funnel (112). The outer wall of the pressure ring (131) is provided with an external thread (132) and engages with an internal thread (113).

3. The screw-type Buchner funnel filter device according to claim 1, characterized in that: The main component (11) also includes a ring seat (117) fixed in a ring shape on the inner wall of the adapter (111), and its position is above the GL45 thread (114). A sealing gasket (118) is fixed at the lower end of the ring seat (117).

4. The screw-type Buchner funnel filter device according to claim 3, characterized in that: The main body component (11) also includes a ramp (119) formed between the top of the ring seat (117) and the inner wall of the adapter (111).

5. The screw-type Buchner funnel filter device according to claim 1, characterized in that: The filter mechanism (1) also includes a pressure relief valve (14) installed on the suction nozzle (115), the threshold pressure of which is set to 0.8 bar.

6. The screw-type Buchner funnel filter device according to claim 3, characterized in that: The adapter (111) and the support plate (116) are both made of PTFE, and the sealing gasket (118) is made of silicone.

Images