A multi-stage filter cleaning device

Abstract

The application relates to the field of liquid filtering and recycling, in particular to a multi-stage filtering and cleaning device which comprises a liquid storage tank, a multi-stage filtering unit and a shunt control mechanism; the liquid storage tank is provided with a water inlet; the multi-stage filtering unit is connected to the output end of the liquid storage tank; the shunt control mechanism comprises a main conveying assembly, a shunt conveying assembly and a circulating backflow assembly; the main conveying assembly is connected to the output end of the multi-stage filtering unit and is used for conveying filtered cooling liquid and accurately adjusting the preset flow of the cooling liquid conveyed to the corresponding shunt conveying assembly by the main conveying assembly; the shunt conveying assembly returns the preset conveying amount of the cooling liquid to the product, and the shunt conveying assembly is provided with a water outlet; the circulating backflow assembly is connected between the main conveying assembly and the liquid storage tank and is used for returning the residual cooling liquid in the main conveying assembly to the liquid storage tank for re-filtering. The device can meet the demand of high efficiency and high cleaning quality for large-scale cleaning products, and can ensure the uniformity of the cleaning quality of each batch of products.

Description

Technical Field

[0001] This application relates to the field of liquid filtration and recycling, and in particular to a multi-stage filtration and cleaning device. Background Technology

[0002] In today's technology field, many products such as graphics cards and servers are equipped with liquid cooling. As technology advances and the performance of these products continues to improve, the requirements for the stability of liquid cooling systems and the cleanliness of the coolant are becoming increasingly stringent. A good coolant circulation and cleaning system can effectively ensure the normal operation of products, extend their lifespan, and improve their efficiency. Because coolant can develop impurities and chemical deposits after prolonged storage, affecting its cooling performance, the industry typically filters and cleans the coolant in products before shipment using a cleaning device. The cleaned coolant, free of impurities and chemical deposits, is then returned to the product to ensure that the product maintains good cooling performance upon leaving the factory.

[0003] Existing cleaning equipment generally has a relatively simple structure, often using a single filter cartridge for filtration and cleaning. The filtered coolant is then transported back to one or more products via pipelines. This meets the basic cleaning requirements before products leave the factory and can clean multiple products simultaneously, further improving cleaning efficiency and meeting the high-efficiency requirements for large-scale product cleaning.

[0004] However, existing cleaning equipment still has significant shortcomings in practical applications. These shortcomings primarily lie in the need to further improve the cleaning effectiveness, especially when cleaning large batches of products. It has been observed that the cleaning effect gradually deteriorates in later batches, and random inspections reveal sedimentation in the coolant returned to the products after filtration, thus affecting product lifespan. Therefore, frequent and regular cleaning of the entire equipment is necessary to ensure consistently high-quality cleaning. However, frequent cleaning of the entire equipment is time-consuming and labor-intensive. Consequently, existing cleaning equipment struggles to meet the demands of high efficiency and high-quality cleaning for large-scale product cleaning, and it is also difficult to guarantee the consistency of cleaning quality across each batch. Summary of the Invention

[0005] To meet the demand for high efficiency and high cleaning quality in large-scale product cleaning, while ensuring the consistency of cleaning quality for each batch of products, this application provides a multi-stage filtration and cleaning device.

[0006] A multi-stage filtration and cleaning device includes a liquid storage tank, at least one set of multi-stage filtration units, and a diversion control mechanism; the liquid storage tank is provided with at least one inlet that is connected to the product outlet; the multi-stage filtration units are connected to the output end of the liquid storage tank; the diversion control mechanism includes a main conveying component, at least one diversion conveying component, and a circulation return component; The main delivery assembly is connected to the output end of the multi-stage filtration unit for delivering the filtered coolant and precisely adjusting the preset flow rate of the coolant delivered by the main delivery assembly to the corresponding diversion delivery assembly; The diversion conveying component is connected to the output end of the main conveying component and returns a preset amount of coolant to the product. The diversion conveying component is provided with an outlet that connects to the product's return water port. The circulating return assembly is connected between the main conveying assembly and the storage tank to return the residual coolant in the main conveying assembly to the storage tank for re-filtration, ensuring that the coolant returned to the product each time is the freshly filtered coolant.

[0007] By adopting the above technical solution, the storage tank is equipped with an inlet that connects to the product's outlet, allowing the coolant flowing out of the product to flow into the storage tank. A multi-stage filtration unit, connected to the storage tank's output, filters the coolant flowing out of the tank, removing impurities and chemical precipitates. The main conveying assembly, connected to the multi-stage filtration unit's output, delivers the filtered coolant and precisely controls the preset flow rate of coolant delivered to the corresponding distribution conveying assembly. This ensures that different products receive the appropriate flow rate of coolant according to their needs, preventing excess coolant in the distribution pipes and improving the targeting and effectiveness of the cleaning process. The distribution conveying assembly, connected to the main conveying assembly's output, returns the preset amount of coolant to the product through an outlet connected to the product's return outlet, ensuring that the coolant in the distribution conveying assembly accurately returns to the product for cooling. The circulating recirculation component connects the main conveying component and the storage tank, allowing residual coolant in the main conveying component to flow back to the storage tank for re-filtration. This prevents residual coolant from mixing with newly filtered coolant, ensuring that the coolant flowing back into the product each time is the freshly filtered coolant. This improves coolant cleanliness and cooling performance, effectively enhancing the cleaning effect, reducing the impact of coolant sediment on product lifespan, and guaranteeing consistent cleaning quality for each batch. This meets the demands of high efficiency and high-quality cleaning for large-scale products. Because residual coolant in the main pipeline is prone to chemical precipitation over time, existing cleaning devices do not promptly recirculate and filter residual coolant in the main pipeline when cleaning later batches of products. Therefore, chemical sediment can easily flow into the products, affecting the cooling effect of later batches.

[0008] Preferably, the main conveying assembly includes a main pipeline, a water pump installed on the main pipeline, and at least one flow regulating valve. The feed end of the main pipeline is sealed to the output end of the multi-stage filtration unit. The flow regulating valve is configured one-to-one with the diversion conveying assembly and is used to adjust the preset flow rate of the coolant conveyed by the main pipeline to the corresponding diversion conveying assembly. The water pump is used to increase the pressure in the main pipeline so that the residual coolant in the main pipeline can flow back to the storage tank.

[0009] By adopting the above technical solution, the main pipeline inlet of the main conveying component is sealed to the output of the multi-stage filtration unit, ensuring that the coolant smoothly enters the main pipeline from the multi-stage filtration unit. The flow regulating valves installed on the main pipeline correspond one-to-one with the distribution conveying components, allowing precise adjustment of the preset flow rate of coolant delivered from the main pipeline to the corresponding distribution conveying component according to the required coolant volume. This ensures that the coolant is distributed to each product as needed, meeting the coolant requirements of different products. Simultaneously, the water pump installed on the main pipeline increases the pressure within it. After the coolant delivery is completed, the residual coolant in the main pipeline can flow back to the storage tank for re-filtration under pressure, preventing residual coolant from mixing with the coolant delivered subsequently. This ensures that the coolant returning to the product each time is the freshly filtered coolant.

[0010] Preferably, each of the diversion and conveying components is provided with a diversion pipe, the feed end of the diversion pipe is sealed to the main pipeline, and the flow regulating valve is provided at the connection between the diversion pipe and the main pipeline.

[0011] By adopting the above technical solution, the feed end of the distributor pipe is sealed to the main pipe, and the flow regulating valve is set at the connection between the distributor pipe and the main pipe. This connection method allows the flow regulating valve to directly and precisely control the coolant entering the distributor pipe from the main pipe, avoiding excess coolant in the distributor pipe. Because the flow regulating valve acts directly at the inlet of the distributor pipe, it can timely and accurately control the flow rate of coolant flowing into the distributor pipe, thereby enabling precise adjustment of the preset delivery amount of coolant to the product. This better meets the coolant flow requirements of different products and ensures the cleaning effect of the product.

[0012] Preferably, the flow regulating valve is an electric regulating valve that controls the on / off state of the diversion and conveying assembly.

[0013] By adopting the above technical solution, the flow regulating valve is set as an electrically controlled regulating valve to control the on / off state of the diversion and conveying component. The electrically controlled regulating valve can achieve automated control and can precisely control the on / off state of the diversion and conveying component according to actual needs. When coolant needs to be delivered to the product, the electrically controlled regulating valve can open quickly, allowing the coolant to flow smoothly into the diversion and conveying component and back into the product; when delivery is not required, it can close quickly to avoid unnecessary flow of coolant.

[0014] Preferably, the circulation reflux assembly includes a reflux pipe and a circulation check valve. The feed end of the reflux pipe is sealed to the main pipeline, and the discharge end of the reflux pipe is sealed to the liquid storage tank. The circulation check valve is installed in the reflux pipe to prevent residual coolant in the reflux pipe from flowing back into the main pipeline.

[0015] By adopting the above technical solution, the feed end of the reflux pipe in the circulation reflux assembly is sealed to the main pipeline, and the discharge end is sealed to the storage tank. This allows residual coolant in the main pipeline to be returned to the storage tank for re-filtration. If residual coolant is not returned for re-filtration and instead directly enters the product, it will affect the cleanliness of the coolant, thus impacting the product's cooling performance. Simultaneously, the circulation check valve installed in the reflux pipe prevents residual coolant in the reflux pipe from flowing back into the main pipeline, ensuring unidirectional coolant flow and preventing coolant already returned to the storage tank from mixing back into the main pipeline. This ensures that each time coolant is returned to the product, it is the freshly filtered coolant, improving coolant cleanliness and product cooling effect.

[0016] Preferably, a main check valve is provided at one end of the main pipe near the output end of the multi-stage filtration unit. The main check valve is used to prevent residual coolant in the main pipe from flowing back into the multi-stage filtration unit.

[0017] By adopting the above technical solution, a main check valve is installed at the end of the main pipeline near the output of the multi-stage filtration unit. During the operation of the multi-stage filtration and cleaning device, when the coolant pressure in the main pipeline changes or stops supplying coolant, the main check valve can act as a one-way valve, preventing residual coolant in the main pipeline from flowing back into the multi-stage filtration unit. This is because if residual coolant flows back into the multi-stage filtration unit, impurities will be re-contaminated with the already filtered coolant, affecting the cleanliness of the coolant and the cleaning effect of subsequent products. The main check valve effectively avoids this situation, thus ensuring the cleanliness of the coolant and improving the cleaning quality of the products.

[0018] Preferably, the liquid storage tank is equipped with a heating element for heating the coolant inside the liquid storage tank.

[0019] By adopting the above technical solution, a heating element is installed inside the storage tank to heat the coolant within. When the coolant is heated, its fluidity increases, allowing it to pass more smoothly through the multi-stage filtration units and pipelines during subsequent filtration and transportation. This increased fluidity enables the coolant to pass through the filter media more quickly during filtration, reducing filtration resistance and thus improving filtration efficiency. Simultaneously, it better prevents impurities in the coolant from depositing in the pipelines, ensuring smooth coolant circulation and ultimately enhancing the cleaning effect and working efficiency of the entire multi-stage filtration and cleaning device.

[0020] Preferably, there are two sets of multi-stage filtration units, and a water tank for storing coolant is provided between the two sets of multi-stage filtration units. The water tank is equipped with a heating element for heating the coolant filtered by the previous multi-stage filtration unit. Each multi-stage filtration unit contains multiple filter cylinders connected in series, and the particle size of the filter particles corresponding to each filter cylinder decreases in a stepwise manner.

[0021] By adopting the above technical solution, two sets of multi-stage filtration units are set up, with each multi-stage filtration unit containing multiple filter cartridges connected in series. The particle size of the filter cartridges decreases in a stepwise manner, allowing the coolant to undergo multiple filtrations of different particle sizes, gradually removing impurities from large to small particles, resulting in finer filtration. Simultaneously, a water tank for storing coolant is placed between the two sets of multi-stage filtration units. The heating element in the tank heats the coolant filtered by the previous multi-stage filtration unit. The heated coolant molecules move more actively, and some impurities dissolved in the coolant may precipitate or aggregate to form larger particles after the temperature rises, making them easier to filter out in the next multi-stage filtration unit. This significantly improves the filtration effect and cleanliness of the coolant.

[0022] Preferably, a depth filter cartridge is provided inside the diversion pipe.

[0023] By adopting the above technical solution and installing a depth filter cartridge inside the distribution pipe, the coolant flowing into the distribution pipe from the main pipe can be further filtered, thereby improving the cleanliness of the coolant and better ensuring the cooling performance and service life of the product.

[0024] Preferably, the storage tank is provided with a replenishment port for an external coolant supply mechanism, used to replenish new coolant to the storage tank.

[0025] By adopting the above technical solution, since the amount of coolant will decrease due to loss and other reasons during use, the storage tank is equipped with a replenishment port for an external coolant supply mechanism. The coolant supply mechanism can replenish new coolant to the storage tank through this replenishment port, which can avoid the normal operation of the cleaning device due to insufficient coolant and ensure that the cleaning device can continuously and stably filter and clean the product coolant.

[0026] In summary, this application includes at least one of the following beneficial technical effects: 1. The main conveying component of the multi-stage filtration cleaning device is equipped with a flow regulating valve, which can precisely adjust the preset flow rate of coolant delivered by the main conveying component to the corresponding diversion conveying component. At the same time, the circulation return component can return the coolant remaining in the main conveying component to the storage tank for re-filtration. Through this precise flow regulation and re-filtration operation, the coolant returned to the product each time is the freshly filtered coolant, which can improve the cleanliness of the coolant, avoid the presence of sediment in the coolant, ensure cleaning quality, and thus extend the service life of the product. It can also ensure the uniformity of cleaning quality for each batch of products and meet the needs of high efficiency and high cleaning quality for large-scale product cleaning. 2. The multi-stage filtration unit of the multi-stage filtration and cleaning device contains multiple filter cartridges connected in series with the particle size decreasing in a stepped manner. The coolant is filtered through multiple filter cartridges of different particle sizes in sequence, which can gradually remove impurities of different sizes and further improve the filtration effect of the coolant. Attached Figure Description

[0027] Figure 1 This is a first-view structural diagram of a multi-stage filtration and cleaning device according to Embodiment 1; Figure 2 This is a second-view structural diagram of a multi-stage filtration and cleaning device according to Embodiment 1; Figure 3 yes Figure 2 A magnified view of point A; Figure 4 This is a third-view structural diagram of a multi-stage filtration and cleaning device according to Embodiment 1; Figure 5 yes Figure 4 A magnified view of point B.

[0028] Explanation of reference numerals in the attached drawings: 1. Storage tank; 2. Multi-stage filtration unit; 3. Diversion control mechanism; 4. Water tank; 11. Inlet; 12. Replenishment port; 21. Filter cartridge; 211. First filter cartridge; 212. Second filter cartridge; 213. Third filter cartridge; 214. Fourth filter cartridge; 31. Main conveying assembly; 32. Diversion conveying assembly; 33. Circulation return assembly; 311. Main pipeline; 312. Water pump; 313. Flow regulating valve; 321. Diversion pipe; 322. Depth filter cartridge; 3211. Outlet; 331. Return pipe; 332. Circulation check valve. Detailed Implementation

[0029] The following examples illustrate this. Figure 1-5 This application will be described in further detail. Example 1

[0030] This application provides a multi-stage filtration and cleaning device, referring to... Figure 1 and Figure 2 The system includes a liquid storage tank 1 mounted on a frame, at least one set of multi-stage filtration units 2, and a flow diversion control mechanism 3. A control system coordinates the operation of the liquid storage tank 1, the multi-stage filtration units 2, and the flow diversion control mechanism 3. The frame serves as the supporting structure for the entire device, providing a mounting base for other components and ensuring the stability and integrity of the device. The liquid storage tank 1, mounted on the frame, receives coolant flowing from the product. The multi-stage filtration units 2, connected to the output end of the liquid storage tank 1 and also mounted on the frame, filter the coolant flowing from the liquid storage tank 1. The flow diversion control mechanism 3 is used to deliver the filtered coolant to the product.

[0031] Specifically, in this embodiment, the storage tank 1 is a container for storing coolant. The inlet 11 of the storage tank 1 connects to the product outlet, allowing coolant to flow from the product into the storage tank 1. The number of inlets 11 is determined by the number of products. The storage tank 1 is connected to multiple inlet pipes, each with its inlet 11 connecting to the outlet of a product. The storage tank 1 is internally equipped with heating elements, such as heating wires or heating rods, to heat the coolant within. Heating the coolant improves its flowability and enhances the filtration effect. The control system can control the operating status of the heating elements in real time based on the coolant temperature, maintaining the coolant within a suitable temperature range. The storage tank 1 also has a replenishment port 12 for an external coolant supply mechanism. When the coolant in the storage tank 1 is insufficient, new coolant can be added through the replenishment port 12, ensuring the continuous operation of the cleaning process.

[0032] Reference Figure 2Specifically, in this embodiment, there are two sets of multi-stage filtration units 2, and the two sets of multi-stage filtration units 2 are connected by a water tank 4 for transition and buffering. Each multi-stage filtration unit 2 includes four filter cylinders 21 connected in series. The four filter cylinders 21 connected in series are, in order, the first filter cylinder 211, the second filter cylinder 212, the third filter cylinder 213, and the fourth filter cylinder 214, and the particle size of the filtered particles corresponding to each filter cylinder 21 decreases in a stepwise manner. The particle sizes of the first filter cylinder 211, the second filter cylinder 212, the third filter cylinder 213, and the fourth filter cylinder 214 of the first set of multi-stage filtration units 2 are 200 micrometers, 150 micrometers, 100 micrometers, and 50 micrometers, respectively; the particle sizes of the first filter cylinder 211, the second filter cylinder 212, the third filter cylinder 213, and the fourth filter cylinder 214 of the second set of multi-stage filtration units 2 are 20 micrometers, 10 micrometers, 5 micrometers, and 1 micrometer, respectively. Through multi-stage filtration, the cleanliness of the coolant is gradually improved. The filter cartridge 21 can be made of filter paper, filter screen, etc., and different materials are suitable for different filtration needs. The number of multi-stage filtration units 2 can be set according to actual needs. In this embodiment, a water tank 4 for storing coolant is set between the two sets of multi-stage filtration units 2. The water tank 4 is also equipped with a heating element to heat the coolant filtered by the previous multi-stage filtration unit 2, further improving the fluidity and filtration effect of the coolant. The control system can also control the heating element in the water tank 4 to ensure that the coolant is filtered at a suitable temperature for subsequent filtration.

[0033] Reference Figure 2 and Figure 3 Specifically, the diversion control mechanism 3 in this embodiment includes a main conveying assembly 31 mounted on a frame, at least one diversion conveying assembly 32, and a circulation return assembly 33. The main conveying assembly 31 is connected to the output end of the multi-stage filtration unit 2, and can convey filtered coolant and precisely adjust the preset flow rate of coolant delivered to the corresponding diversion conveying assembly 32. The diversion conveying assembly 32 is connected to the output end of the main conveying assembly 31, and returns the preset amount of coolant to the product. The diversion conveying assembly 32 is provided with an outlet 3211 that connects to the product's return water port. The circulation return assembly 33 is connected between the main conveying assembly 31 and the storage tank 1, and can return the coolant remaining in the main conveying assembly 31 to the storage tank 1 for re-filtration, ensuring that the coolant returned to the product each time is the freshly filtered coolant. This effectively improves the cleanliness of the coolant and ensures the uniformity of product cleaning quality. The entire device is also equipped with a control system, which can monitor and control the operating status of each component of the device in real time. Reference Figure 2 and Figure 3The main conveying assembly 31 includes a main pipeline 311, a water pump 312 installed on the main pipeline 311, and at least one flow regulating valve 313. The main pipeline 311 can be made of metal or plastic and has good pressure resistance and corrosion resistance. The feed end of the main pipeline 311 is sealed to the output end of the multi-stage filtration unit 2, and the sealing is ensured by means of sealing rings or other methods. A main check valve is installed at the end of the main pipeline 311 near the output end of the multi-stage filtration unit 2 to prevent residual coolant in the main pipeline 311 from flowing back into the multi-stage filtration unit 2. The water pump 312 is used to increase the pressure in the main pipeline 311. When it is necessary to return the residual coolant in the main pipeline 311 to the storage tank 1, the water pump 312 provides power. The flow regulating valve 313 is installed one-to-one with the diversion conveying assembly 32 and is used to regulate the preset flow rate of coolant delivered from the main pipeline 311 to the corresponding diversion conveying assembly 32. The flow regulating valve 313 can be an electrically operated regulating valve, which enables precise regulation of flow rate and flow on / off control via electric control. The number of diversion and conveying components 32 is set according to the number of products, with each product receiving coolant through an independent diversion and conveying component 32.

[0034] Reference Figure 2 and Figure 3 Each diversion and conveying component 32 is equipped with a diversion pipe 321. The inlet end of the diversion pipe 321 is sealed to the main pipe 311, and a flow regulating valve 313 is located at the connection between the diversion pipe 321 and the main pipe 311. A depth filter cartridge 322 can be installed inside the diversion pipe 321. The particle size of the filter cartridge 322 is 0.8 microns, which further filters the coolant and improves the cleanliness of the coolant. The outlet 3211 of the diversion pipe 321 is connected to the product return port, so that the preset amount of coolant is returned to the product.

[0035] In particular, in order to achieve a reasonable layout of the device, the inlet end of the liquid storage tank 1 and the outlet end of the diversion pipe 321 are arranged in an orderly manner on the frame, with one inlet pipe and one diversion pipe 321 forming a group that is individually connected to one product.

[0036] Reference Figure 4 and Figure 5 The circulating reflux assembly 33 includes a reflux pipe 331 and a circulating check valve 332. The inlet end of the reflux pipe 331 is sealed to the main pipe 311, and the outlet end of the reflux pipe 331 is sealed to the storage tank 1. The circulating check valve 332 is installed in the reflux pipe 331 to prevent residual coolant in the reflux pipe 331 from flowing back into the main pipe 331.

[0037] The implementation principle of this embodiment is as follows: Coolant flows from the product outlet into the storage tank 1. The control system determines whether coolant needs to be replenished through the replenishment port 12 based on the coolant level. Simultaneously, it controls the heating element in the storage tank 1 to heat the coolant, improving its fluidity. The heated coolant flows into the multi-stage filtration unit 2 for multi-stage filtration. During this process, the heating element in the water tank 4 between the two multi-stage filtration units 2 also heats the coolant under the control of the control system, further improving the coolant's fluidity and filtration effect. The filtered coolant is conveyed through the main conveying assembly 31. The control system controls the flow regulating valve 313 to precisely adjust the coolant flow rate to each diversion conveying assembly 32 according to a preset flow value. The diversion conveying assembly 32 returns the coolant to the product. When there is residual coolant in the main conveying assembly 31, the control system controls the water pump 312 to provide power to return the residual coolant to the storage tank 1 through the circulation return assembly 33 for re-filtration, ensuring that the coolant returning to the product each time is the freshly filtered coolant. This multi-stage filtration and precise diversion method, under the precise control of the control system, effectively improves the cleanliness of the coolant, ensures the uniformity of product cleaning quality, and solves the problems of poor cleaning effect and difficulty in meeting large-scale cleaning needs of existing cleaning devices. It represents a significant improvement and enhancement compared to existing technologies. Example 2

[0038] Compared with the above embodiment 1, the difference in this embodiment 2 is that there is only one set of multi-stage filtration units 2. The feed end of the multi-stage filtration unit 2 is sealed to the discharge end of the liquid storage tank 1, and the discharge end of the multi-stage filtration unit 2 is directly sealed to the main pipeline 311. In this embodiment, the particle sizes of the first filter cylinder 211, the second filter cylinder 212, the third filter cylinder 213, and the fourth filter cylinder 214 of the multi-stage filtration unit 2 are 100 micrometers, 50 micrometers, 20 micrometers, and 1 micrometer, respectively.

[0039] This specific embodiment is merely an explanation of this application and is not intended to limit it. After reading this specification, those skilled in the art can make modifications to this embodiment without contributing any inventive step, but such modifications are protected by patent law as long as they fall within the scope of the claims of this application.

Claims

1. A multi-stage filtration and cleaning device, characterized in that, It includes a storage tank (1), at least one set of multi-stage filtration units (2) and a diversion control mechanism (3); the storage tank (1) is provided with at least one inlet (11) connected to the product outlet; the multi-stage filtration unit (2) is connected to the output end of the storage tank (1); the diversion control mechanism (3) includes a main conveying component (31), at least one diversion conveying component (32) and a circulation return component (33); The main delivery component (31) is connected to the output end of the multi-stage filtration unit (2) for delivering the filtered coolant and precisely adjusting the preset flow rate of the coolant delivered by the main delivery component (31) to the corresponding diversion delivery component (32); The diversion conveying component (32) is connected to the output end of the main conveying component (31) and returns the preset amount of coolant to the product. The diversion conveying component (32) is provided with an outlet (3211) that is connected to the product return water port. The circulating return component (33) is connected between the main conveying component (31) and the storage tank (1) to return the residual coolant in the main conveying component (31) to the storage tank (1) for re-filtration, so as to ensure that the coolant returned to the product each time is the freshly filtered coolant.

2. The multi-stage filtration and cleaning device according to claim 1, characterized in that, The main conveying assembly (31) includes a main pipe (311), a water pump (312) installed on the main pipe (311), and at least one flow regulating valve (313). The feed end of the main pipe (311) is sealed to the output end of the multi-stage filtration unit (2). The flow regulating valve (313) is configured one-to-one with the diversion conveying assembly (32) and is used to regulate the preset flow rate of the coolant conveyed by the main pipe (311) to the corresponding diversion conveying assembly (32). The water pump (312) is used to increase the pressure in the main pipe (311) so that the residual coolant in the main pipe (311) can flow back to the storage tank (1).

3. The multi-stage filtration and cleaning device according to claim 2, characterized in that, Each of the diversion conveying components (32) is provided with a diversion pipe (321), the feed end of the diversion pipe (321) is sealed to the main pipe (311), and the flow regulating valve (313) is provided at the connection between the diversion pipe (321) and the main pipe (311).

4. The multi-stage filtration and cleaning device according to claim 2, characterized in that, The flow regulating valve (313) is an electrically operated regulating valve that controls the on / off state of the diversion and conveying assembly (32).

5. The multi-stage filtration and cleaning device according to claim 2, characterized in that, The circulating reflux assembly (33) includes a reflux pipe (331) and a circulating check valve (332). The feed end of the reflux pipe (331) is sealed to the main pipe (311), and the discharge end of the reflux pipe (331) is sealed to the liquid storage tank (1). The circulating check valve (332) is installed on the reflux pipe (331) to prevent residual coolant in the reflux pipe (331) from flowing back to the main pipe (311).

6. The multi-stage filtration and cleaning device according to claim 2, characterized in that, A main check valve is provided at one end of the main pipe (311) near the output end of the multi-stage filtration unit (2). The main check valve is used to prevent residual coolant in the main pipe (311) from flowing back into the multi-stage filtration unit (2).

7. The multi-stage filtration and cleaning device according to claim 1, characterized in that, The storage tank (1) is equipped with a heating element for heating the coolant inside the storage tank (1).

8. The multi-stage filtration and cleaning device according to claim 1, characterized in that, The number of multi-stage filtration units (2) is two sets, and a water tank (4) for storing coolant is provided between the two sets of multi-stage filtration units (2). The water tank (4) is equipped with a heating element for heating the coolant filtered by the previous multi-stage filtration unit (2). Each multi-stage filtration unit (2) contains multiple filter cylinders (21) connected in series, and the particle size of the filter particles corresponding to each filter cylinder (21) decreases in a stepwise manner.

9. The multi-stage filtration and cleaning device according to claim 3, characterized in that, The diversion pipe (321) is equipped with a depth filter cartridge (322).

10. The multi-stage filtration and cleaning device according to claim 1, characterized in that, The storage tank (1) is provided with a replenishment port (12) for an external coolant supply mechanism, which is used to replenish new coolant to the storage tank (1).

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