Filtering device for the pre-treatment of a sample of a nutrient salt

Abstract

The utility model relates to filter equipment technical field, and disclose a kind of filtering device for nutrient salt sample pretreatment, including filter cylinder, the bottom of filter cylinder is connected with filter assembly with screw thread, and the inner wall of filter cylinder is slidably connected with piston, the top of filter cylinder is connected with shell by screw, the inside of shell is slidably connected with extruding rod, the outer wall of filter cylinder is connected with first valve with screw thread, and one end of first valve is inserted with hose.The utility model is driven worm, worm wheel and drive gear to run by micro motor, drives extruding rod and piston to complete sample suction and extrusion filtration automatically, without manual operation, reduce manpower cost and improve processing efficiency;Meanwhile, filter assembly uses the first filter material and second filter material of aperture gradually reducing, when sample passes through two layers of filter material in turn, suspended particulate matter, impurities and other interfering components can be fully intercepted, ensure that the sample purity after filtration, provide accurate pretreatment basis for subsequent nutrient salt detection.

Description

Technical Field

[0001] This utility model relates to the field of filtration equipment technology, specifically a filtration device for pretreatment of nutrient salt samples. Background Technology

[0002] Nutrients are crucial substances for maintaining the growth and reproduction of organisms in aquatic ecosystems. Their content and distribution directly reflect the nutrient status of water bodies and are of great significance for assessing water quality and providing early warning of eutrophication. Before detecting and analyzing nutrients in water bodies, the collected samples need to be pretreated. Filtration is one of the core steps in the pretreatment process. Its purpose is to remove suspended particulate matter, impurities, and other interfering components from the samples, preventing them from affecting the accuracy of subsequent testing instruments and the accuracy of test results, thus laying the foundation for precise quantitative analysis of nutrients. Existing filtration equipment is ill-suited for the pretreatment needs of small-volume (typically only a few milliliters to tens of milliliters) nutrient samples: large vacuum filtration devices are bulky and complex to operate, easily resulting in sample residue and waste; small needle filters, while suitable for small volumes, are disposable and cannot clean impurities (such as suspended particles) trapped by filtration, which is inconvenient for subsequent auxiliary analysis of impurity components and increases consumable costs; although glass frit funnels are reusable, cleaning residual impurities requires repeated disassembly and rinsing, which is cumbersome and prone to cross-contamination due to incomplete cleaning, making it difficult to meet the actual needs of efficient and convenient processing of small-volume nutrient samples. Utility Model Content

[0003] Technical problems to be solved To address the shortcomings of existing technologies, this invention provides a filtration device for pretreatment of nutrient salt samples. It is small in size, easy to carry, and convenient for handling impurities after filtration. It is suitable for filtering small-volume solutions such as nutrient salt samples, thus solving the aforementioned technical problems.

[0004] (II) Technical Solution To achieve the above objectives, the present invention provides the following technical solution: a filtration device for pretreatment of nutrient salt samples, comprising a filter cylinder, a filter assembly threadedly connected to the bottom of the filter cylinder, a piston slidably connected to the inner wall of the filter cylinder, a housing connected to the top of the filter cylinder by screws, a squeezing rod slidably connected inside the housing, a first valve threadedly connected to the outer wall of the filter cylinder, and a flexible hose inserted into one end of the first valve; The filter assembly includes a cylindrical body, a rotating shaft rotatably connected to the inner wall of the cylindrical body, a ring body fixedly connected to one end of the rotating shaft, a ring plate one fixedly connected to the inner circumferential surface of the ring body, a spiral tube fixedly connected to the top surface of the ring plate one, a first filter material and a second filter material sleeved on the outer surface of the spiral tube, and a ring plate two connected to the top end of the spiral tube by a screw, a C-shaped frame fixedly connected to the outer wall of the cylindrical body, a locking pin inserted inside the C-shaped frame, a spring sleeved on the outer surface of the locking pin, and a lever rotatably connected to one end of the locking pin by a pin shaft, a second valve threadedly connected to the bottom of the cylindrical body, and a sealing ring snapped onto the outer circumferential surface of the ring body.

[0005] Preferably, a worm gear and a worm are rotatably connected to the inner wall of the housing, a drive gear is connected to the center of the end face of the worm gear via a shaft, and one end of the worm is fixedly connected to the output shaft of a micro motor.

[0006] Preferably, the outer surface of the extrusion rod has multiple toothed grooves, which are evenly distributed along the axis of the extrusion rod. The drive gear meshes with the toothed grooves of the extrusion rod. A switch is fixedly connected to the outer wall of the housing, and the switch is connected to a micro motor via a wire.

[0007] Preferably, the bottom of the filter press cylinder is threadedly connected to a cylinder body, and two protruding rods are fixedly connected to the outer circumferential surface of the filter press cylinder. One end of each protruding rod is fixedly connected to a vertical rod, and the bottom end of each vertical rod is fixedly connected to a base plate.

[0008] Preferably, the first filter material is a mixed cellulose ester filter membrane with a pore size of 0.45 μm; the second filter material is a polyethersulfone filter plate with a pore size of 0.22 μm, and the first filter material is attached to the top surface of the second filter material.

[0009] Preferably, two rotating shafts are fixedly connected to the outer circumferential surface of the ring body. The two rotating shafts are coaxial, and one of the rotating shafts has a square hole at the end away from the ring body, into which a locking pin is inserted. The other rotating shaft has a knob connected to the end away from the ring body.

[0010] Compared with the prior art, the present invention provides a filtration device for pretreatment of nutrient salt samples, which has the following beneficial effects: 1. This utility model uses a micro motor to drive a worm gear, worm wheel, and drive gear to rotate, thereby automatically completing sample intake and compression filtration by the squeezing rod and piston. This eliminates the need for manual operation, reducing labor costs and improving processing efficiency. At the same time, the filtration assembly uses a first filter material and a second filter material with progressively smaller pore sizes. When the sample passes through the two layers of filter material, suspended particulate matter, impurities, and other interfering components can be fully retained, ensuring the purity of the filtered sample and providing an accurate pretreatment basis for subsequent nutrient salt detection.

[0011] 2. After filtration, this utility model allows you to simply pull out the locking pin by moving the lever and turn the knob to rotate the ring and filter media 180°. Then, the piston squeezes clean water to backwash the filter media. The clean water can specifically wash away the impurities trapped on the filter media. Cleaning can be completed without disassembling the filter media, making the operation simple and convenient. The cleaned filter media can be reused for subsequent sample filtration, avoiding the waste caused by frequent filter media replacement, significantly reducing the operating cost of the device, and reducing the environmental impact of filter media waste. It is both economical and environmentally friendly. Attached Figure Description

[0012] Figure 1 This is a three-dimensional schematic diagram of the present invention; Figure 2 This is a schematic diagram of the back of the present invention; Figure 3 This is a three-dimensional cross-sectional view of the filter press and other components of this utility model; Figure 4 This is a three-dimensional cross-sectional view of the filter assembly in this utility model; Figure 5 This is a schematic diagram of the exploded disassembly of the filter component in this utility model; Figure 6 This utility model Figure 4 A magnified view of part A in the diagram.

[0013] The components are as follows: 1. Filter press cylinder; 2. Filter assembly; 21. Cylinder body; 22. Rotating shaft; 23. Ring body; 24. Ring plate one; 25. Helical tube; 26. First filter media; 27. Second filter media; 28. Ring plate two; 29. ​​C-shaped frame; 210. Locking pin; 211. Spring; 212. Paddle; 213. Second valve; 214. Sealing ring; 215. Knob; 3. Piston; 4. Housing; 5. Extrusion rod; 6. First valve; 7. Hose; 8. Worm gear; 9. Worm; 10. Drive gear; 11. Micro motor; 12. Upright pole; 13. Base plate. Detailed Implementation

[0014] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments. 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.

[0015] Please see Figures 1-6A filtration device for pretreatment of nutrient salt samples includes a filter cylinder 1, a filter assembly 2 threadedly connected to the bottom of the filter cylinder 1, a piston 3 slidably connected to the inner wall of the filter cylinder 1, a housing 4 connected to the top of the filter cylinder 1 by screws, a squeezing rod 5 slidably connected inside the housing 4, a first valve 6 threadedly connected to the outer wall of the filter cylinder 1, and a hose 7 inserted into one end of the first valve 6. The filter assembly 2 includes a cylindrical body 21, a rotating shaft 22 rotatably connected to the inner wall of the cylindrical body 21, a ring body 23 fixedly connected to one end of the rotating shaft 22, a ring plate 24 fixedly connected to the inner circumferential surface of the ring body 23, a spiral tube 25 fixedly connected to the top surface of the ring plate 24, a first filter material 26 and a second filter material 27 sleeved on the outer surface of the spiral tube 25, and a ring plate 28 connected to the top end of the spiral tube 25 by a screw, a C-shaped frame 29 fixedly connected to the outer wall of the cylindrical body 21, a locking pin 210 inserted inside the C-shaped frame 29, a spring 211 sleeved on the outer surface of the locking pin 210, and a lever 212 rotatably connected to one end of the locking pin 210 by a pin shaft, a second valve 213 threadedly connected to the bottom of the cylindrical body 21, and a sealing ring 214 snapped onto the outer circumferential surface of the ring body 23.

[0016] Specifically, a worm gear 8 and a worm 9 are rotatably connected to the inner wall of the housing 4. The end face of the worm gear 8 is connected to a drive gear 10 via a shaft, and one end of the worm 9 is fixedly connected to the output shaft of a micro motor 11.

[0017] Specifically, the outer surface of the extrusion rod 5 has multiple toothed grooves, which are evenly distributed along the axis of the extrusion rod 5. The drive gear 10 meshes with the toothed grooves of the extrusion rod 5. A switch is fixedly connected to the outer wall of the housing 4, and the switch is connected to the micro motor 11 through a wire.

[0018] The advantage is that by closing the second valve 213, the first valve 6 is opened, and then the hose 7 is inserted into the nutrient sample. Then, by starting the switch, the micro motor 11 is turned on. The micro motor 11 drives the worm 9 to rotate, the worm 9 drives the worm wheel 8 to rotate, the worm wheel 8 drives the drive gear 10 to rotate, and the drive gear 10 can drive the extrusion rod 5 to rise. At this time, the extrusion rod 5 drives the piston 3 connected to its bottom end to rise. When the piston 3 rises with the extrusion rod 5, a negative pressure environment is formed inside the filter press 1. Since the first valve 6 is in the open state and the hose 7 has been inserted into the nutrient sample, the external atmospheric pressure will push the nutrient sample along the hose 7 into the filter press 1, realizing the automatic aspiration of the sample.

[0019] Specifically, the bottom of the filter press cylinder 1 is threadedly connected to the cylinder body 21, and two protruding rods are fixedly connected to the outer circumference of the filter press cylinder 1. One end of the protruding rod is fixedly connected to the upright rod 12, and the bottom end of the upright rod 12 is fixedly connected to the bottom plate 13.

[0020] Specifically, the first filter material 26 is a mixed cellulose ester filter membrane with a pore size of 0.45 μm; the second filter material 27 is a polyethersulfone filter plate with a pore size of 0.22 μm, and the first filter material 26 is attached to the top surface of the second filter material 27.

[0021] The advantage is that when the nutrient salt sample is drawn into the filter cylinder 1, the first valve 6 is closed and the second valve 213 is opened. Then, the micro motor 11 is controlled to run in reverse by the start switch. The micro motor 11 drives the worm 9 to rotate in reverse, the worm 9 drives the worm wheel 8 to rotate in reverse, and the worm wheel 8 drives the drive gear 10 to rotate in reverse, thereby pushing the extrusion rod 5 to move downward. The extrusion rod 5 drives the piston 3 to slide downward along the inner wall of the filter cylinder 1. The downward sliding of the piston 3 will generate downward pressure on the nutrient salt sample in the filter cylinder 1. Under the action of pressure, the nutrient salt sample will enter the cylinder 21 of the filter assembly 2 and pass through the first filter material 26 and the second filter material 27 in sequence. The suspended particulate matter, impurities and other interfering components in the sample will be intercepted by the first filter material 26 and the second filter material 27 with progressively smaller pore sizes. The filtered nutrient salt sample can finally be discharged into the cup placed on the bottom plate 13.

[0022] Specifically, two rotating shafts 22 are fixedly connected to the outer circumference of the ring 23. The two rotating shafts 22 are coaxial, and one of the rotating shafts 22 has a square hole at the end away from the ring 23. A locking pin 210 is inserted into the square hole. The other rotating shaft 22 has a knob 215 connected to the end away from the ring 23.

[0023] The advantage is that after filtration, by turning the lever 212, it rotates around the pin connected to the locking pin 210. At this time, one end of the lever 212 abuts against the outer wall of the C-shaped frame 29, and the lever 212 can drive the front end of the locking pin 210 to be pulled out from the square hole of one of the rotating shafts 22. At this time, the ring body 23 can be rotated 180 degrees by turning the knob 215. The ring body 23 then drives the first filter material 26 and the second filter material 27 to flip over. By setting the sealing ring 214, it can be attached to the outer wall of the cylinder 21 to play a sealing role. At this time, the first valve 6 is opened and the second valve 213 is closed. Clean water is drawn into the filter press cylinder 1 through the hose 7. Then, the micro motor 11 is controlled to drive the worm 9, the worm wheel 8 and the drive gear. When the drive gear 10 is turned on, it causes the extrusion rod 5 to move downward. The extrusion rod 5 pushes the piston 3 to slide downward along the inner wall of the filter cylinder 1. The piston 3 generates downward pressure on the clean water in the filter cylinder 1. Under the action of pressure, the clean water enters the cylinder 21 of the filter assembly 2 downward. The clean water first contacts the bottom surface of the second filter material 27, which originally faced the bottom of the cylinder 21 and intercepted impurities, and then flows through the bottom surface of the first filter material 26. Through the reverse flushing force of the clean water, the suspended particles and impurities intercepted on the first filter material 26 and the second filter material 27 are washed off. After the second valve 213 is opened, the washed-off impurities will be discharged with the clean water, thereby completing the reverse flushing and cleaning of the first filter material 26 and the second filter material 27 for subsequent reuse.

[0024] In use, first close the second valve 213 and open the first valve 6. Insert the tubing 7 into the nutrient sample. Start the micro motor 11 to drive the worm 9 to rotate. The worm 9 drives the worm wheel 8 and the drive gear 10 connected to it to rotate. The drive gear 10 drives the extrusion rod 5 to rise. The extrusion rod 5 drives the piston 3 to rise, creating a negative pressure inside the filter cylinder 1. The external atmospheric pressure pushes the nutrient sample along the tubing 7 into the filter cylinder 1. After the nutrient sample is absorbed, close the first valve 6 and open the second valve 213. Start the switch again to control the micro motor 11 to rotate in the reverse direction. The micro motor 11 drives the worm 9, worm wheel 8, and drive gear 10 to rotate in the reverse direction. The drive gear 10 pushes the extrusion rod 5 and piston 3 along the inner wall of the filter cylinder 1. As the piston slides down, it applies pressure to the sample, causing it to enter the cylinder 21 of the filter assembly 2. The sample then passes through the first filter material 26 and the second filter material 27 in sequence, where impurities are trapped. The filtered sample is then discharged into a cup on the bottom plate 13 via the second valve 213. After filtration, the lever 212 of the filter assembly 2 is turned so that the locking pin 210 is pulled out from the square hole of the rotating shaft 22. The knob 215 is turned so that the ring 23 and the filter material can be rotated 180°. The second valve 213 is closed and the first valve 6 is opened, allowing clean water to be drawn in through the hose 7. The micro motor 11 is controlled to drive the piston 3 to squeeze the clean water downwards, which then backwashes the two filter materials. The second valve 213 is then opened to discharge the clean water containing impurities, completing the cleaning of the filter materials for reuse.

[0025] 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 pretreatment of nutrient salt samples, comprising a filter press (1), characterized in that: The bottom of the filter press (1) is threaded with a filter assembly (2), and a piston (3) is slidably connected to the inner wall of the filter press (1). The top of the filter press (1) is connected with a housing (4) by screws. A squeezing rod (5) is slidably connected inside the housing (4). A first valve (6) is threadedly connected to the outer wall of the filter press (1), and a hose (7) is inserted into one end of the first valve (6). The filter assembly (2) includes a cylindrical body (21), a rotating shaft (22) is rotatably connected to the inner wall of the cylindrical body (21), a ring body (23) is fixedly connected to one end of the rotating shaft (22), a ring plate (24) is fixedly connected to the inner circumferential surface of the ring body (23), a spiral tube (25) is fixedly connected to the top surface of the ring plate (24), a first filter material (26) and a second filter material (27) are sleeved on the outer surface of the spiral tube (25), and the top end of the spiral tube (25) is connected by a screw. The cylinder (21) is connected to a ring plate (28), and a C-shaped frame (29) is fixedly connected to the outer wall of the cylinder (21). A locking pin (210) is inserted inside the C-shaped frame (29). A spring (211) is sleeved on the outer surface of the locking pin (210), and a lever (212) is rotatably connected to one end of the locking pin (210) through a pin shaft. A second valve (213) is threaded to the bottom of the cylinder (21), and a sealing ring (214) is snapped onto the outer circumferential surface of the ring body (23).

2. The filtration device for nutrient sample pretreatment according to claim 1, characterized in that: A worm wheel (8) and a worm (9) are rotatably connected to the inner wall of the housing (4). A drive gear (10) is connected to the center of the end face of the worm wheel (8) through a shaft. The output shaft of a micro motor (11) is fixedly connected to one end of the worm (9).

3. The filtration device for nutrient sample pretreatment according to claim 2, characterized in that: The outer surface of the extrusion rod (5) is provided with multiple toothed grooves, which are evenly distributed along the axis of the extrusion rod (5). The drive gear (10) meshes with the toothed grooves of the extrusion rod (5). A switch is fixedly connected to the outer wall of the housing (4), and the switch is connected to the micro motor (11) through a wire.

4. The filtration device for nutrient sample pretreatment according to claim 1, characterized in that: The bottom of the filter press (1) is threaded with a cylinder body (21), and two protruding rods are fixedly connected to the outer circumference of the filter press (1). One end of the protruding rod is fixedly connected to a vertical rod (12), and the bottom end of the vertical rod (12) is fixedly connected to a bottom plate (13).

5. The filtration device for nutrient sample pretreatment according to claim 1, characterized in that: Two rotating shafts (22) are fixedly connected to the outer circumferential surface of the ring (23). The two rotating shafts (22) are coaxial, and one of the rotating shafts (22) has a square hole at the end away from the ring (23), into which a locking pin (210) is inserted. The other rotating shaft (22) has a knob (215) connected to the end away from the ring (23).

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