Nutrient solution circulation and replenishment device for a biological filtration device

Abstract

The utility model discloses a kind of nutrient solution circulation and replenishing device of biological filtration device, it is related to biological filtration technical field.The utility model includes filter tower body, filter tower body is provided with filtering mechanism inside, one side of filter tower body is provided with circulating replenishing mechanism, the spray end of filtering mechanism is provided with circulating spray mechanism, one end of circulating spray mechanism is provided with reciprocating drive mechanism.The utility model is driven end by reciprocating drive mechanism Rotary motion, actively extrude the spray end of circulating spray mechanism, force its spray end inside the spray end of filtering mechanism Circulating sliding;In this process, the edge of hard spray end continuously scratches the mineral substance such as calcium and magnesium ion crystallization deposited on spray end surface;This mechanical scraping mechanism effectively solves the inherent defects of traditional spray system, actively scraping is from source to destroy the formation and solidification process of scale layer, guarantee the long-term stability of spray flow and the efficient operation of device.

Description

Technical Field

[0001] This utility model belongs to the field of biological filtration technology, and specifically relates to a nutrient solution circulation and replenishment device for a biological filtration apparatus. Background Technology

[0002] The nutrient solution circulation and replenishment device of a biofiltration system typically consists of a storage tank, a transfer pump, a spray system, a return pipeline, and monitoring sensors. Its core function is to use the circulation pump to transport the nutrient solution from the storage tank to the biofilter layer, where it is sprayed to provide the microorganisms with nutrients such as nitrogen, phosphorus, and trace elements. Unabsorbed nutrient solution is recycled back to the storage tank through the return pipeline for reuse. At the same time, the sensors monitor parameters such as nutrient solution concentration and pH value in real time. When the nutrient level is lower than the threshold, the replenishment device is automatically triggered to add fresh nutrient solution to the storage tank to maintain microbial activity and degradation efficiency, thereby reducing resource waste and secondary pollution.

[0003] According to Chinese Patent Publication No. CN222111434U, a biological trickling filter tower with a spray device is used in conjunction with a spray frame, a diversion pipe, nozzles, a storage chamber, a filter screen, a fixing bolt, a water pump, and a water outlet pipe. During use, the nutrient solution inside the storage chamber is pumped out by the water pump, and the nutrient solution is transported to the spray frame through the water outlet pipe. By setting a ring of nozzles below the spray frame, the nutrient solution can be evenly sprayed into the interior of the tower.

[0004] However, the above-mentioned devices, when combined with existing biological filtration devices, all have drawbacks. During the nutrient solution circulation process, the nutrient solution needs to be continuously sprayed onto the surface of the packing material to maintain microbial activity. During this process, minerals in the nutrient solution (such as calcium and magnesium ions) will evaporate with the water and crystallize on the surface of the nozzle. These crystals will form a scale layer on the nozzle surface. The continuous impact force of the liquid flow can only ensure that no crystallization occurs inside the nozzle orifice. However, with long-term use, the crystals will gradually turn into particles, accelerating the growth of the scale layer. The scale layer will further capture more particles, eventually forming a dense blockage on the nozzle surface. Even if the liquid flow has a continuous impact force, it cannot penetrate the solidified composite scale layer, ultimately leading to a decrease in local spray flow rate and seriously affecting the stable operation efficiency of the device. Utility Model Content

[0005] In response to the problem in related technologies that minerals in the nutrient solution crystallize on the nozzle surface as water evaporates, and that with long-term use, the crystals turn into particles, eventually forming dense blockages on the nozzle surface, leading to a decrease in local spray flow and seriously affecting the stable operation efficiency of the device, this utility model proposes a nutrient solution circulation and replenishment device for a biological filtration device to overcome the above-mentioned technical problems existing in the existing related technologies.

[0006] To solve the above-mentioned technical problems, this utility model is achieved through the following technical solution:

[0007] This utility model is a nutrient solution circulation and replenishment device for a biological filtration device, including a filter tower body, a filtration mechanism is provided inside the filter tower body, a circulation replenishment mechanism is provided on one side of the filter tower body, a circulation spray mechanism is provided at the spray end of the filtration mechanism, and a reciprocating drive mechanism is provided at one end of the circulation spray mechanism.

[0008] The drive end of the reciprocating drive mechanism rotates, causing the spray end of the extrusion and circulation spray mechanism to slide inside the spray end of the filter mechanism.

[0009] Furthermore, the filtration mechanism includes a spray pipe, which is fixedly connected inside the filter tower body. The filter tower body is fixedly connected with packing material and a filter screen. An air inlet pipe is fixedly connected to one end of the filter tower body, and an air outlet pipe is fixedly connected to the other end of the filter tower body.

[0010] Furthermore, the circulation replenishment mechanism includes a recovery pipe, which is fixedly connected to one end of the filter tower body. A circulation box is fixedly connected to one end of the recovery pipe, and a circulation pipe is fixedly connected to one end of the circulation box. A circulation pump is fixedly installed in the middle of the circulation pipe, and one end of the circulation pipe is fixedly connected to one end of the spray pipe.

[0011] Furthermore, a replenishment pipe is fixedly connected to one end of the circulation tank, and a replenishment tank is fixedly connected to one end of the replenishment pipe. A switch valve is installed inside the replenishment pipe.

[0012] Furthermore, a motor is fixedly installed at one end of the replenishment box, and a stirring rod is fixedly connected to the output shaft of the motor, which is rotatably connected inside the replenishment box.

[0013] Furthermore, the circulating spray mechanism includes several nozzles, all of which are slidably connected inside the spray pipe. Each nozzle has spray holes on its surface, a limiting plate is fixedly connected to its surface, and a spring is sleeved on its surface. One end of the spring is fixedly connected to the limiting plate, and the other end is fixedly connected inside the spray pipe. A storage cavity is formed inside the nozzle, and a second spring is fixedly connected inside the storage cavity. One end of the second spring is fixedly connected to a pressure plate, one side of which is angled. A return pipe is fixedly installed at one end of the spray pipe, and one end of the return pipe is fixedly connected to one side of the filter tower body.

[0014] Furthermore, the reciprocating drive mechanism includes a second motor, which is fixedly installed at one end of the filter tower body. The output shaft of the second motor is fixedly connected to a first gear, and a second gear meshes with the surface of the first gear. The second gear is rotatably connected to one end of the filter tower body. A reciprocating plate is fixedly connected to the surface of the second gear, and a plurality of reciprocating grooves are formed on the surface of the reciprocating plate. One end of the reciprocating plate contacts one end of a plurality of nozzles.

[0015] This utility model has the following beneficial effects:

[0016] 1. This utility model actively squeezes the spray end of the circulating spray mechanism through the rotational motion of the drive end of the reciprocating drive mechanism, forcing the spray end to slide cyclically inside the spray end of the filter mechanism. During this process, the hard edge of the spray end continuously scrapes the surface of the spray end, promptly removing minerals such as calcium and magnesium ion crystals deposited due to the evaporation of nutrient solution water. This mechanical scraping mechanism effectively solves the inherent defects of traditional spray systems. Although the liquid flow impact can temporarily prevent crystallization inside the spray hole, the crystals accumulated on the surface of the nozzle over a long period of time will gradually harden into a scale layer and adsorb particulate matter, forming a dense composite blockage layer that is difficult to penetrate, ultimately leading to a decrease in spray flow and deterioration of operating efficiency. Active scraping, on the other hand, destroys the formation and solidification process of the scale layer from the source, ensuring the long-term stability of the spray flow and the efficient operation of the device.

[0017] 2. This utility model, when the nozzle slides into the spray pipe, the nutrient solution entering the storage chamber acts on the inclined surface of the pressure plate under water pressure, pushing the pressure plate to compress the second spring, thus expanding the storage chamber space to accommodate a constant liquid volume. During spraying, the nozzle slides out of the spray pipe, and at this time, the gravity of the nutrient solution itself and the restoring force of the second spring work together to drive the pressure plate to completely force the nutrient solution in the storage chamber out of the spray hole. This process ensures that the liquid volume discharged each time is strictly consistent, avoiding waste caused by excessive nutrient solution addition, and preventing the inhibition of microbial activity due to insufficient supply, achieving the optimal balance between reagent consumption and treatment efficiency, and enabling microorganisms to obtain a stable and regular nutrient supply.

[0018] Of course, any product implementing this utility model does not necessarily need to achieve all of the advantages described above at the same time. Attached Figure Description

[0019] To more clearly illustrate the technical solutions of the utility model embodiments, the accompanying drawings used in the description of the embodiments will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the utility model. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0020] Figure 1 This is a schematic diagram of the overall structure of this utility model;

[0021] Figure 2 This is a side view of the present invention.

[0022] Figure 3 This is a cross-sectional structural diagram of the present invention;

[0023] Figure 4 This is an exploded structural diagram of the circulating spray mechanism and reciprocating drive mechanism of this utility model.

[0024] Figure 5 This is a schematic cross-sectional view of the circulating spray mechanism of this utility model;

[0025] Figure 6 For the present utility model Figure 5 Enlarged structural diagram at point A in the middle;

[0026] Figure 7 This is a partial cross-sectional structural diagram of the circulating spray mechanism of this utility model.

[0027] The attached diagram lists the components represented by each number as follows:

[0028] 1. Filter tower body; 2. Filtering mechanism; 201. Spray pipe; 202. Packing; 203. Filter screen; 204. Inlet pipe; 205. Outlet pipe; 3. Circulation and replenishment mechanism; 301. Recovery pipe; 302. Circulation box; 303. Circulation pipe; 304. Circulation pump; 305. Replenishment pipe; 306. Replenishment box; 307. Switch valve; 308. Motor 1; 309. Stirring rod; 4. Circulation spraying mechanism; 401. Spray head; 402. Spray hole; 403. Limiting plate; 404. Spring 1; 405. Storage chamber; 406. Spring 2; 407. Pressure plate; 408. Return pipe; 5. Reciprocating drive mechanism; 501. Motor 2; 502. Gear 1; 503. Gear 2; 504. Reciprocating plate; 505. Reciprocating trough. Detailed Implementation

[0029] The technical solutions of the utility model embodiments will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the utility model, and not all embodiments. Based on the embodiments of the utility model, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the utility model.

[0030] In the description of this utility model, it should be understood that the terms "opening", "upper", "lower", "top", "middle", "inner", etc., which indicate orientation or positional relationship, are only for the convenience of describing the utility model and simplifying the description, and do not indicate or imply that the components or elements referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on the utility model.

[0031] Please see Figures 1-7 As shown, this utility model is a nutrient solution circulation and replenishment device for a biological filtration device, including a filter tower body 1, a filter mechanism 2 is provided inside the filter tower body 1, a circulation replenishment mechanism 3 is provided on one side of the filter tower body 1, a circulation spray mechanism 4 is provided at the spray end of the filter mechanism 2, and a reciprocating drive mechanism 5 is provided at one end of the circulation spray mechanism 4.

[0032] By rotating the drive end of the reciprocating drive mechanism 5, the drive end of the mechanism squeezes the spray end of the circulating spray mechanism 4, so that the spray end slides inside the spray end of the filter mechanism 2.

[0033] The exhaust gas reaches the interior of the filter tower body 1, where the filter mechanism 2 filters the exhaust gas. The excess nutrient solution generated during the filtration process is re-transported to the spray end of the filter mechanism 2 through the circulation replenishment mechanism 3. The drive end of the reciprocating drive mechanism 5 rotates, causing it to squeeze the spray end of the circulating spray mechanism 4, so that the spray end slides inside the spray end of the filter mechanism 2, thereby achieving the discharge of the nutrient solution.

[0034] Through the rotational motion of the drive end of the reciprocating drive mechanism 5, the spray end of the circulating spray mechanism 4 is actively squeezed, forcing its spray end to slide in a circular motion inside the spray end of the filter mechanism 2. During this process, the hard edge of the spray end continuously scrapes the surface of the spray end, promptly removing minerals such as calcium and magnesium ion crystals deposited due to the evaporation of nutrient solution water. This mechanical scraping mechanism effectively solves the inherent defects of traditional spray systems. Although the liquid flow impact can temporarily prevent crystallization inside the spray hole, the crystals accumulated on the surface of the nozzle over a long period of time will gradually harden into a scale layer and adsorb particulate matter, forming a dense composite blockage layer that is difficult to penetrate, ultimately leading to a decrease in spray flow and deterioration of operating efficiency. Active scraping, on the other hand, destroys the formation and solidification process of the scale layer from the source, ensuring the long-term stability of the spray flow and the efficient operation of the device.

[0035] In one embodiment, the filter mechanism 2 includes a spray pipe 201, which is fixedly connected inside the filter tower body 1. The filter tower body 1 is fixedly connected with a packing material 202 and a filter screen 203. One end of the filter tower body 1 is fixedly connected with an air inlet pipe 204 and an air outlet pipe 205.

[0036] By connecting the inlet pipe 204 to the exhaust gas, the exhaust gas passes through the biological packing material 202 inside the filter tower body 1. Nutrient solution is sprayed onto the surface of the biological packing material 202 through the spray pipe 201, causing the biological packing material 202 to react with the nutrient solution, thereby filtering the exhaust gas passing through the biological packing material 202. Finally, the filtered exhaust gas is discharged through the outlet pipe 205. Excess nutrient solution flows out from the biological packing material 202 and reaches the surface of the filter screen 203. The filter screen 203 filters the residue of the biological packing material 202 in the nutrient solution, allowing the pure nutrient solution to fall to the bottom of the filter tower body 1.

[0037] In addition, nutrient solution is sprayed onto the surface of the biological packing 202 to maintain the activity and growth of microorganisms attached to the surface of the packing. When the exhaust gas passes through the biological packing 202, which is moistened and nourished by the nutrient solution, the organic or some inorganic gaseous pollutants in the exhaust gas are first adsorbed or dissolved in the water film on the surface of the packing 202. Subsequently, the active microorganisms attached to the packing 202 use these dissolved or adsorbed pollutants as carbon sources or energy sources required for their growth, and convert them into harmless or low-toxic substances through their own metabolism, thereby achieving biological purification of the exhaust gas.

[0038] In one embodiment, the circulation replenishment mechanism 3 includes a recovery pipe 301, which is fixedly connected to one end of the filter tower body 1. A circulation box 302 is fixedly connected to one end of the recovery pipe 301, and a circulation pipe 303 is fixedly connected to one end of the circulation box 302. A circulation pump 304 is fixedly installed in the middle of the circulation pipe 303. One end of the circulation pipe 303 is fixedly connected to one end of the spray pipe 201. A replenishment pipe 305 is also fixedly connected to one end of the circulation box 302. A replenishment box 306 is fixedly connected to one end of the replenishment pipe 305. A switch valve 307 is installed inside the replenishment pipe 305. A motor 308 is fixedly installed at one end of the replenishment box 306. A stirring rod 309 is fixedly connected to the output shaft of the motor 308. The stirring rod 309 is rotatably connected inside the replenishment box 306.

[0039] Excess nutrient solution reaches the interior of the filter tower body 1 and flows into the circulation tank 302 through the recovery pipe 301. The circulation pump 304 is started, which drives the nutrient solution in the circulation tank 302 to be transported back into the spray pipe 201 through the circulation pipe 303, thus completing the recycling of the nutrient solution. When the nutrient solution in the circulation tank 302 is insufficient, the switch valve 307 is activated, which allows the nutrient solution in the replenishment tank 306 to be transported into the circulation tank 302 through the replenishment pipe 305 to replenish the nutrient solution. The motor 308 is started to drive the stirring rod 309 to rotate, so that the stirring rod 309 stirs the nutrient solution and prevents sedimentation caused by prolonged storage of the nutrient solution.

[0040] In one embodiment, the circulating spray mechanism 4 includes a plurality of nozzles 401, all of which are slidably connected inside the spray pipe 201. Each nozzle 401 has a spray hole 402 on its surface. A limiting plate 403 is fixedly connected to the surface of each nozzle 401. A spring 404 is sleeved on the surface of each nozzle 401. One end of the spring 404 is fixedly connected to the surface of the limiting plate 403, and the other end is fixedly connected to the inside of the spray pipe 201. A storage cavity 405 is provided inside each nozzle 401. A spring 406 is fixedly connected inside the storage cavity 405. One end of the spring 406 is fixedly connected to a pressure plate 407, one side of which is angled. A return pipe 408 is fixedly installed at one end of the spray pipe 201, and one end of the return pipe 408 is fixedly connected to one side of the filter tower body 1.

[0041] Nutrient solution is injected into the spray pipe 201. When the nozzle 401 drives the spray hole 402 to slide into the spray pipe 201, the nutrient solution reaches the storage chamber 405 inside the nozzle 401 through the spray hole 402. The water pressure squeezes the angle of the pressure plate 407, causing the pressure plate 407 to compress the second spring 406, thereby keeping the nutrient solution in the storage chamber 405 consistent. When the nutrient solution in the storage chamber 405 is full, it is discharged into the filter tower body 1 through the return pipe 408 at one end of the spray pipe 201. During spraying, the nozzle 401 drives the spray hole 402 to slide out of the spray pipe 201. Under the gravity of the nutrient solution and the rebound force of the spring 406, the pressure plate 407 pushes out all the nutrient solution in the storage chamber 405 through the spray hole 402, thus completing the spraying. As the nozzle 401 slides in a circular motion inside the spray pipe 201, the crystals on the surface of the nozzle 401 are scraped off by the edge of the spray pipe 201 when the nozzle 401 slides into the spray pipe 201, thus cleaning the crystals on the surface of the nozzle 401 in real time.

[0042] In addition, the nozzles 402 on the surface of the nozzle 401 are located on both sides of the nozzle 401, which facilitates the scraping of crystals around the nozzles 402. At the same time, when the nozzle 401 drives the nozzles 402 to detach from the spray pipe 201, the rebound force of the spring 406 drives the pressure plate 407 to press the nutrient pressure out, which can prevent impurities from entering the nozzles 402.

[0043] In one embodiment, the reciprocating drive mechanism 5 includes a second motor 501, which is fixedly installed at one end of the filter tower body 1. The output shaft of the second motor 501 is fixedly connected to a first gear 502, and a second gear 503 meshes with the surface of the first gear 502. The second gear 503 is rotatably connected to one end of the filter tower body 1, and a reciprocating plate 504 is fixedly connected to the surface of the second gear 503. The surface of the reciprocating plate 504 is provided with a plurality of reciprocating grooves 505, and one end of the reciprocating plate 504 contacts one end of a plurality of nozzles 401.

[0044] Motor 2 501 drives gear 1 502 to rotate, which in turn drives gear 2 503 to rotate. Gear 2 503 then drives reciprocating plate 504 to rotate inside the filter tower body 1. This causes the surface of reciprocating plate 504 to press against one end of several nozzles 401. The nozzles 401 then drive limiting plate 403 to compress spring 1 404, causing the nozzles 401 to detach from the spray pipe 201. When the reciprocating groove 505 is located at one end of the nozzle 401, spring 1 404 drives limiting plate 403 to retract the nozzles 401 back into the spray pipe 201. Through continuous rotation, the nozzles 401 circulate and expand within the spray pipe 201, scraping away crystals on the surface of the nozzles 401 in real time.

[0045] Through the above technical solution, 1. Nutrient solution is injected into the spray pipe 201, and the nutrient solution reaches the storage chamber 405 inside the spray head 401 through the spray hole 402. The motor 2 501 drives the gear 1 502 to rotate, which in turn drives the gear 2 503 to rotate. The gear 2 503 drives the reciprocating plate 504 to rotate inside the filter tower body 1, causing the surface of the reciprocating plate 504 to press against one end of several spray heads 401. This causes the spray head 401 to drive the limiting plate 403 to compress the spring 1 404. 401 drives the nozzle 402 to slide out of the spray pipe 201. Under the gravity of the nutrient solution, it is completely discharged through the nozzle 402. When the reciprocating tank 505 is located at one end of the nozzle 401, the spring 404 drives the limiting plate 403 to retract the nozzle 401 and retract the nozzle 401 into the spray pipe 201 to replenish the nutrient solution in the storage chamber 405. Through continuous rotation, the nozzle 401 is cyclically extended and retracted in the spray pipe 201 to scrape off the crystals on the surface of the nozzle 401 in real time.

[0046] 2. When the nozzle 401 drives the nozzle 402 into the spray pipe 201, the nutrient solution entering the storage chamber 405 acts on the inclined surface of the pressure plate 407 under water pressure, pushing the pressure plate 407 to compress the second spring 406, causing the storage chamber 405 to expand to accommodate a constant liquid volume. During spraying, the nozzle 401 drives the nozzle 402 out of the spray pipe 201. At this time, the gravity of the nutrient solution itself and the restoring force of the second spring 406 work together to drive the pressure plate 407 to completely force the nutrient solution in the storage chamber 405 out of the nozzle 402. This process ensures that the liquid volume discharged each time is strictly consistent, avoiding waste caused by excessive nutrient solution addition, and preventing microbial activity inhibition caused by insufficient supply. It achieves the optimal balance between reagent consumption and treatment efficiency, enabling microorganisms to obtain a stable and regular nutrient supply.

[0047] In the description of this specification, references to terms such as "an embodiment," "example," "specific example," etc., indicate that a specific feature, structure, material, or characteristic described in connection with that embodiment or example is included in at least one embodiment or example of the utility model. In this specification, the illustrative expressions of the above terms do not necessarily refer to the same embodiment or example. Furthermore, the specific features, structures, materials, or characteristics described may be combined in any suitable manner in one or more embodiments or examples.

[0048] The preferred embodiments of the utility model disclosed above are merely illustrative of the utility model. These preferred embodiments do not exhaustively describe all details, nor do they limit the utility model to the specific implementations described. Clearly, many modifications and variations can be made based on the content of this specification. This specification selects and specifically describes these embodiments to better explain the principles and practical applications of the utility model, thereby enabling those skilled in the art to better understand and utilize it. The utility model is limited only by the claims and their full scope and equivalents.

Claims

1. A nutrient solution circulation and replenishment device for a biological filtration apparatus, comprising a filter tower body (1), characterized in that, The filter tower body (1) is equipped with a filter mechanism (2) inside, a circulation replenishment mechanism (3) is provided on one side of the filter tower body (1), a circulation spray mechanism (4) is provided at the spray end of the filter mechanism (2), and a reciprocating drive mechanism (5) is provided at one end of the circulation spray mechanism (4). The reciprocating drive mechanism (5) rotates, causing its drive end to press against the spray end of the circulating spray mechanism (4), so that its spray end slides inside the spray end of the filter mechanism (2).

2. The nutrient solution circulation and replenishment device of the biological filtration device according to claim 1, characterized in that, The filtration mechanism (2) includes a spray pipe (201), which is fixedly connected inside the filter tower body (1). The filter tower body (1) is fixedly connected with a packing material (202), a filter screen (203) is fixedly connected inside the filter tower body (1), an air inlet pipe (204) is fixedly connected to one end of the filter tower body (1), and an air outlet pipe (205) is fixedly connected to one end of the filter tower body (1).

3. The nutrient solution circulation and replenishment device of a biological filtration device according to claim 2, characterized in that, The circulation replenishment mechanism (3) includes a recovery pipe (301), which is fixedly connected to one end of the filter tower body (1). A circulation box (302) is fixedly connected to one end of the recovery pipe (301), and a circulation pipe (303) is fixedly connected to one end of the circulation box (302). A circulation pump (304) is fixedly installed in the middle of the circulation pipe (303), and one end of the circulation pipe (303) is fixedly connected to one end of the spray pipe (201).

4. The nutrient solution circulation and replenishment device of a biological filtration device according to claim 3, characterized in that, One end of the circulation tank (302) is also fixedly connected to a replenishment pipe (305), and one end of the replenishment pipe (305) is fixedly connected to a replenishment tank (306). A switch valve (307) is installed inside the replenishment pipe (305).

5. The nutrient solution circulation and replenishment device of a biological filtration device according to claim 4, characterized in that, A motor (308) is fixedly installed at one end of the replenishment box (306), and a stirring rod (309) is fixedly connected to the output shaft of the motor (308). The stirring rod (309) is rotatably connected inside the replenishment box (306).

6. The nutrient solution circulation and replenishment device of a biological filtration device according to claim 5, characterized in that, The circulating spray mechanism (4) includes several nozzles (401), each of which is slidably connected inside the spray pipe (201). Each nozzle (401) has a spray hole (402) on its surface. A limiting plate (403) is fixedly connected to the surface of each nozzle (401). A spring (404) is sleeved on the surface of each nozzle (401), with one end of the spring (404) fixedly connected to the surface of the limiting plate (403). The other end of the spring (404)... One end is fixedly connected to the inside of the spray pipe (201). The inside of the spray head (401) is provided with a storage cavity (405). A second spring (406) is fixedly connected inside the storage cavity (405). One end of the second spring (406) is fixedly connected to a pressure plate (407). One side of the pressure plate (407) is at an angle. A return pipe (408) is fixedly installed at one end of the spray pipe (201). One end of the return pipe (408) is fixedly connected to one side of the filter tower body (1).

7. The nutrient solution circulation and replenishment device of a biological filtration device according to claim 6, characterized in that, The reciprocating drive mechanism (5) includes a second motor (501), which is fixedly installed at one end of the filter tower body (1). The output shaft of the second motor (501) is fixedly connected to a first gear (502). The surface of the first gear (502) is meshed with a second gear (503). The second gear (503) is rotatably connected to one end of the filter tower body (1). The surface of the second gear (503) is fixedly connected to a reciprocating plate (504). The surface of the reciprocating plate (504) is provided with several reciprocating grooves (505). One end of the reciprocating plate (504) contacts one end of several nozzles (401).

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