A filtration device for edible oil testing

Abstract

This utility model relates to the field of laboratory sample pretreatment technology, and in particular to a filtration device for edible oil testing. It includes a vacuum filtration flask and a Buchner funnel threaded onto the top of the flask. Filter paper is placed inside the Buchner funnel. A liquid inlet pipe is vertically installed inside the flask, with its top communicating with the inner cavity of the Buchner funnel and its bottom positioned at the bottom of the flask's inner cavity. An exhaust assembly is installed on the outer wall of the flask. By raising the exhaust port to the top of the flask cavity, absolute physical isolation is achieved. This effectively prevents edible oil from being sucked into the vacuum system, eliminating the need for operators to constantly monitor the liquid level. It thoroughly protects expensive downstream testing instruments and vacuum equipment, avoiding experimental interruptions and economic losses due to backflow accidents, and preventing losses and cross-contamination caused by oil samples entering the pipeline. This ensures the representativeness and purity of the analyzed samples, resulting in more accurate and reliable test results.

Description

Technical Field

[0001] This utility model relates to the field of laboratory sample pretreatment technology, specifically a filtration device for edible oil testing. Background Technology

[0002] In the quality and safety testing of edible oils (such as testing peroxide value, solvent residue, impurity content, etc.), it is often necessary to filter the oil sample to remove solid particles, crystals or other suspended impurities and obtain a clear filtrate for subsequent analysis.

[0003] Currently, the most commonly used filtration device in laboratories is a reduced-pressure filtration system consisting of a Buchner funnel and a vacuum filtration flask. This system uses a vacuum pump to reduce the air pressure inside the vacuum filtration flask, allowing the liquid to be filtered to pass quickly through the Buchner funnel lined with filter paper under atmospheric pressure, thus achieving solid-liquid separation.

[0004] However, in practical applications, it has been found that traditional filtration devices have the following inherent drawbacks: The suction port is prone to contact with liquid, which can lead to accidents: The suction port of a traditional vacuum filtration flask is located on the side wall of the flask. During the filtration process, the operator must pay close attention to the liquid level inside the flask. Once the liquid level of the collected filtrate rises to the side port, edible oil can easily be sucked into the suction pipe, which can lead to a series of serious consequences: contamination and damage to the expensive vacuum pump; loss of oil sample, affecting the accuracy of the test; and cleaning the vacuum pipe blocked by grease is extremely troublesome and interrupts the experimental process.

[0005] There is a risk of cross-contamination: Even if backflow does not occur, the exhaust port located on the side wall is exposed to an oil-rich environment for a long time. The condensed oil vapor may still contaminate the pipeline and cause cross-contamination when filtering other samples in the next batch.

[0006] The operation is inconvenient and relies on manual monitoring: the entire filtration process requires operators to frequently observe the liquid level and pause the experiment when the filtrate is full, release the vacuum, and disassemble the device to transfer the filtrate. This not only increases the labor intensity of the operators but also reduces work efficiency and makes it impossible to achieve short-term unattended operation.

[0007] Therefore, there is an urgent need in the field for a dedicated filtration device that can fundamentally prevent filtrate from entering the pumping system and improve operational safety and convenience. Utility Model Content

[0008] The purpose of this invention is to provide a filtration device for edible oil testing, so as to solve the problems mentioned in the background art.

[0009] To achieve the above objectives, this utility model provides the following technical solution: A filtration device for testing edible oil includes a filtration flask and a Buchner funnel threaded onto the top of the filtration flask. Filter paper is placed in the inner cavity of the Buchner funnel. An inlet pipe is vertically arranged inside the filtration flask. The top of the inlet pipe communicates with the inner cavity of the Buchner funnel, and the bottom of the inlet pipe is located at the bottom of the inner cavity of the filtration flask. An exhaust assembly is installed on the outer wall of the filtration flask. The exhaust assembly includes a fixed base that is fixedly installed on the outer wall of the filtration bottle. An L-shaped exhaust pipe is vertically fixedly connected to the inner arc wall of the fixed base. The end of the L-shaped exhaust pipe is located at the top of the inner cavity of the filtration bottle. An exhaust pipe that communicates with the L-shaped exhaust pipe is fixedly connected to the side of the fixed base away from the filtration bottle.

[0010] Furthermore, a bottom connector is fixedly installed on the top of the filtration flask, and the top of the bottom connector is provided with an annular threaded groove and a central insertion hole, and the top of the liquid inlet pipe is connected to the central insertion hole.

[0011] Furthermore, two centrally symmetrically distributed lugs are vertically fixedly installed on the outer side wall of the Buchner funnel, and a top connector is fixedly installed on the bottom of the Buchner funnel.

[0012] Furthermore, a threaded ring and a liquid extraction tube are fixedly installed at the bottom of the top connector, and the liquid extraction tube is connected to the inner cavity of the Buchner funnel.

[0013] Furthermore, when the threaded ring is threaded into the annular threaded groove, the top connector and the bottom connector end contact each other, and at this time the liquid extraction tube is appropriately inserted into the central insertion hole and communicates with the liquid inlet tube.

[0014] Furthermore, the L-shaped suction tube extends vertically upward into the inner cavity of the filtration flask, and the distance between it and the top of the inner cavity of the filtration flask is 1 cm.

[0015] Furthermore, the filtration flask is made of transparent glass and has a volume scale coated on its surface.

[0016] Furthermore, a flange is vertically fixed to the end of the exhaust pipe away from the fixed seat.

[0017] Compared with the prior art, the beneficial effects of this utility model are: By raising the suction port to the top of the bottle cavity, absolute physical isolation is achieved. This effectively prevents edible oil from being sucked into the vacuum system without requiring operators to constantly monitor the liquid level, thus completely protecting the expensive testing instruments and vacuum equipment at the back end and avoiding experimental interruptions and economic losses caused by backflow accidents. This avoids losses and cross-contamination caused by oil samples entering the pipeline, ensuring the representativeness and purity of the analyzed samples, thus making the test results more accurate and reliable; Operators no longer need to frequently interrupt experiments due to concerns about excessive liquid levels. The device allows the filtration process to continue until the bottle is nearly full, significantly reducing operational steps, lowering labor intensity, improving work efficiency, and even enabling short periods of unattended operation. Attached Figure Description

[0018] Figure 1 This is a schematic diagram of the overall appearance and structure of the present utility model; Figure 2 This is a schematic cross-sectional view of the overall structure of this utility model; Figure 3 This is a schematic diagram of the installation structure of the suction filter bottle, Buchner funnel, and suction and exhaust assembly of this utility model. Figure 4 This is a schematic diagram of the top structure of the filtration bottle of this utility model.

[0019] In the picture: 1. Filter flask; 11. Bottom connector; 12. Annular threaded groove; 13. Center insertion hole; 14. Inlet pipe; 2. Buchner funnel; 21. Filter paper; 22. Ear block; 23. Top connector; 24. Threaded ring; 25. Suction tube; 31. Fixing base; 32. L-shaped exhaust pipe; 33. Exhaust pipe. Detailed Implementation

[0020] The technical solutions of the present utility model will be clearly and completely described below with reference to the embodiments of the present utility model. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments. All other embodiments obtained by those skilled in the art based on the embodiments of the present utility model without creative effort are within the protection scope of the present utility model.

[0021] To facilitate understanding of this utility model, a more comprehensive description of the utility model will be given below with reference to the accompanying drawings, and several embodiments of the utility model will be provided. However, the utility model can be implemented in many different forms and is not limited to the embodiments described herein. On the contrary, the purpose of providing these embodiments is to make the disclosure of the utility model more thorough and complete.

[0022] For examples, please refer to Figure 1-4 This utility model provides a technical solution: A filtration device for edible oil testing includes a vacuum filtration flask 1 and a Buchner funnel 2 threadedly attached to the top of the vacuum filtration flask 1. The Buchner funnel 2 is made of borosilicate glass and has a porous ceramic filter plate at its bottom. Filter paper 21, which is quantitative analysis filter paper, is placed in the inner cavity of the Buchner funnel 2. An inlet pipe 14 is vertically arranged inside the vacuum filtration flask 1. The inlet pipe 14 is made of polytetrafluoroethylene and its inner wall is polished. The top of the inlet pipe 14 is connected to the inner cavity of the Buchner funnel 2, and the bottom of the inlet pipe 14 is located at the bottom of the inner cavity of the vacuum filtration flask 1, maintaining a distance of 3-5 mm from the bottom of the flask. A vacuum and exhaust assembly is installed on the outer wall of the vacuum filtration flask 1. The exhaust assembly includes a mounting base 31 fixedly installed on the outer wall of the filtration bottle 1 by an oil-resistant sealant. The mounting base 31 is made of polypropylene plastic. An L-shaped exhaust pipe 32 is vertically fixedly connected to the inner arc wall of the mounting base 31. The L-shaped exhaust pipe 32 is made of stainless steel and has a smooth inner wall without burrs. The end of the L-shaped exhaust pipe 32 is located at the top of the inner cavity of the filtration bottle 1. An exhaust pipe 33 connected to the L-shaped exhaust pipe 32 is fixedly connected to the side of the mounting base 31 away from the filtration bottle 1. The outer wall of the exhaust pipe 33 is provided with anti-slip texture.

[0023] The top of the filtration flask 1 is fixedly installed with a bottom connector 11 by high-temperature fusion sealing. The bottom connector 11 is made of borosilicate glass. The top of the bottom connector 11 has an annular threaded groove 12 and a central insertion hole 13. A sealing ring is provided in the annular threaded groove 12. The top of the liquid inlet pipe 14 is connected to the central insertion hole 13, and the connection is treated with frosted sealing.

[0024] Two centrally symmetrically distributed lugs 22 are vertically fixed on the outer wall of the Buchner funnel 2. The lugs 22 are made of heat-resistant plastic and have anti-slip texture on the surface. The bottom of the Buchner funnel 2 is fixedly installed with a top connector 23 by glass welding. The bottom of the Buchner funnel 2 is formed with multiple filter holes that penetrate its thickness. The top connector 23 is integrally formed with the bottom of the funnel with filter holes or fixedly connected by a sealing method. The bottom of the top connector 23 is fixedly installed with a threaded ring 24 and a liquid extraction tube 25. The threaded ring 24 is coated with polytetrafluoroethylene. The liquid extraction tube 25 is connected to the inner cavity of the Buchner funnel 2. The outer diameter of the liquid extraction tube 25 and the inner diameter of the center insertion hole 13 are fitted with a transition fit, and the fit tolerance is H7 / g6.

[0025] When the threaded ring 24 is threaded into the annular threaded groove 12, the top connector 23 contacts the end of the bottom connector 11, and at this time the liquid extraction tube 25 is inserted into the central insertion hole 13 and connected to the liquid inlet tube 14. The L-shaped suction tube 32 extends vertically upward into the inner cavity of the filtration bottle 1, and the distance between it and the top of the inner cavity of the filtration bottle 1 is 1 cm. The filtration bottle 1 is made of transparent glass material, and the surface is coated with capacity scale lines by etching process. The scale line accuracy is ±5mL. The end of the exhaust pipe 33 away from the fixed seat 31 is vertically fixed with a flange, and the flange connection surface is provided with a silicone rubber sealing gasket.

[0026] The working process of a filtration device for edible oil testing is as follows: 1. Preparation Place the filter paper 21 flat inside the Buchner funnel 2, ensuring it completely covers the porous structure at the bottom. Gently lift the funnel 2 using the lugs 22 on its outer wall, and slowly screw in the threaded ring 24 at the bottom connector 23, aligning it with the annular threaded groove 12 at the top connector 11 of the filtration flask 1. During this process, the suction tube 25 is inserted into the central insertion hole 13, achieving a sealed connection with the inlet tube 14.

[0027] 2. Filtering operation Slowly pour the edible oil to be filtered into the Buchner funnel 2, ensuring the liquid level does not exceed the edge of the filter paper 21. Turn on the vacuum equipment connected to the exhaust pipe 33, and the suction and exhaust assembly begins to operate. External air is extracted through the exhaust pipe 33 and the L-shaped suction pipe 32, creating a stable negative pressure environment inside the suction flask 1. Under the influence of atmospheric pressure difference, the edible oil quickly passes through the filter paper 21, and solid impurities are effectively trapped on the surface of the filter paper 21.

[0028] 3. Liquid diversion process The filtered, clarified edible oil flows sequentially through the suction pipe 25 and the inlet pipe 14. Since the bottom of the inlet pipe 14 extends to the bottom of the inner cavity of the suction filtration flask 1, the liquid is directly transported to the bottom of the container. This design effectively avoids splashing when the liquid falls, ensuring that the liquid level always remains in a stable rising state.

[0029] 4. Continuous filtration and safety protection As filtration continues, the liquid level inside the filtration flask 1 gradually rises. Because the end of the L-shaped suction pipe 32 is located at the top of the cavity inside the filtration flask 1, and the pipe opening remains vertically upward, the suction port is always in the gas phase space above the liquid surface. This structure ensures that the vacuum pumping process does not come into contact with the edible oil, fundamentally eliminating the risk of liquid being drawn into the exhaust system.

[0030] 5. End operation When the liquid level approaches the rated capacity of the filtration flask 1, the operator can observe the graduation mark through the transparent flask wall and stop filtration in time. First, turn off the vacuum equipment, then slowly rotate the lug 22 of the Buchner funnel 2 to separate it from the filtration flask 1. Finally, transfer the filtered edible oil from the filtration flask 1 to a designated container to complete the entire filtration process.

[0031] This device achieves safe and efficient filtration through its unique inlet pipe 14 design and high-level air extraction structure, making it particularly suitable for sample pretreatment in edible oil testing.

[0032] 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 filtration device for edible oil testing, comprising a vacuum filtration flask (1) and a Buchner funnel (2) threadedly attached to the top of the vacuum filtration flask (1), wherein filter paper (21) is placed in the inner cavity of the Buchner funnel (2), characterized in that: The filtration flask (1) is vertically provided with an inlet pipe (14), the top of which is connected to the inner cavity of the Buchner funnel (2), and the bottom of which is located at the bottom of the inner cavity of the filtration flask (1). The filtration flask (1) is equipped with a vacuum assembly on its outer side wall. The exhaust assembly includes a fixed seat (31) fixedly installed on the outer wall of the filter bottle (1). An L-shaped exhaust pipe (32) is vertically fixedly connected to the inner arc wall of the fixed seat (31). The end of the L-shaped exhaust pipe (32) is located at the top of the inner cavity of the filter bottle (1). An exhaust pipe (33) connected to the L-shaped exhaust pipe (32) is fixedly connected to the side of the fixed seat (31) away from the filter bottle (1).

2. The filtration device for edible oil detection according to claim 1, characterized in that: The top of the filtration flask (1) is fixedly installed with a bottom connector (11). The top of the bottom connector (11) is provided with an annular threaded groove (12) and a central insertion hole (13). The top of the liquid inlet pipe (14) is connected to the central insertion hole (13).

3. The filtration device for edible oil detection according to claim 2, characterized in that: Two centrally symmetrically distributed ear blocks (22) are vertically fixedly installed on the outer side wall of the Buchner funnel (2), and a top connector (23) is fixedly installed on the bottom of the Buchner funnel (2).

4. The filtration device for edible oil detection according to claim 3, characterized in that: The bottom of the top connector (23) is fixedly equipped with a threaded ring (24) and a liquid extraction tube (25), which is connected to the inner cavity of the Buchner funnel (2).

5. The filtration device for edible oil detection according to claim 4, characterized in that: When the threaded ring (24) is threaded into the annular threaded groove (12), the top connector (23) contacts the end of the bottom connector (11), and at this time the liquid extraction tube (25) is inserted into the center insertion hole (13) and communicates with the liquid inlet tube (14).

6. The filtration device for edible oil detection according to claim 1, characterized in that: The L-shaped suction tube (32) extends vertically upward into the inner cavity of the filtration bottle (1), and the distance between it and the top of the inner cavity of the filtration bottle (1) is 1 cm.

7. The filtration device for edible oil detection according to claim 1, characterized in that: The filtration flask (1) is made of transparent glass and has a capacity scale line coated on its surface.

8. The filtration device for edible oil detection according to claim 1, characterized in that: A flange is vertically fixed at the end of the exhaust pipe (33) away from the fixed seat (31).

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