A filter device

Abstract

This utility model relates to the field of purification technology and discloses a filtration device, including a device body and a filter. The device body includes a shell with an inlet. The filter includes a filter body disposed inside the shell and communicating with the inlet. A composite filter layer is fixedly disposed on the filter body. The composite filter layer includes a coarse filter layer, an adsorption layer, and a fine filter layer arranged sequentially, with gaps between the coarse filter layer, the adsorption layer, and the fine filter layer. This solution forms a layered filtration system of "screening, adsorption, and filtration" by setting up the coarse filter layer, the adsorption layer, and the fine filter layer. Through the layered filtration system, large particles on the outer coarse filter layer are quickly intercepted, avoiding clogging of the inner adsorption layer and the fine filter layer, thereby increasing the overall filtration throughput by 50% and adapting to precipitates with different particle size distributions, eliminating the need for frequent replacement of filter media according to operating conditions.

Description

Technical Field

[0001] This solution relates to the field of purification technology, specifically to a filtration device. Background Technology

[0002] Sediment filtration is widely used in chemical, environmental protection, pharmaceutical, and food industries (such as solid-liquid separation in wastewater treatment, product purification after chemical reactions, and impurity removal in pharmaceutical processes). With the development of industrial refinement and the improvement of environmental standards, the requirements for filtration efficiency, precision, and automation are increasing, and traditional filtration devices are gradually revealing their performance bottlenecks.

[0003] Currently available filtration methods mainly include plate and frame filtration and centrifugal filtration. However, when processing high-viscosity or fine-particle suspensions, the filter cloth is easily clogged by micron-sized precipitates, such as colloids and microbial cells, resulting in a sharp drop in filtration flux. This requires frequent shutdowns for cleaning, and each cycle is too long. Utility Model Content

[0004] The present invention aims to provide a filtration device that reduces the probability of clogging and improves the accuracy of filtration.

[0005] To achieve the above objectives, the present invention adopts the following technical solution: a filtration device, comprising a device body and a filter, the device body comprising a housing, the housing having an inlet, the filter comprising a filter body disposed inside the housing and communicating with the inlet, a composite filter layer fixedly disposed on the filter body, the composite filter layer comprising a coarse filter layer, an adsorption layer and a fine filter layer disposed sequentially, and a gap being provided between the coarse filter layer, the adsorption layer and the fine filter layer.

[0006] The beneficial effects of this solution are as follows: By setting up a coarse filter layer, an adsorption layer, and a fine filter layer, this solution forms a layered filtration system of "screening first, then adsorption, and then filtration". Through the setting of the layered filtration system, large particles on the outer coarse filter layer are quickly intercepted, avoiding clogging of the inner adsorption and fine filter layers, thereby increasing the overall filtration throughput by 50% and adapting to precipitates with different particle size distributions, eliminating the need for frequent replacement of filter media according to operating conditions.

[0007] Furthermore, the adsorption layer includes a porous polytetrafluoroethylene (PTFE) framework, the outer edge of which is fixedly connected to the filter body, and the interior is filled with a mixture of magnetic nanoparticles and activated carbon.

[0008] Beneficial effects: The adsorption layer, filled with a mixture of magnetic nanoparticles and activated carbon, actively adsorbs charged colloids and nanoparticles, thus compensating for the insufficient pore size of traditional filter media. The nanoscale filter membrane precisely intercepts minute impurities, achieving a filtration accuracy 10 times higher than traditional equipment, meeting the high-purity requirements of pharmaceuticals, semiconductors, and other industries.

[0009] Furthermore, the filter body is provided with connecting flanges at both ends, and the coarse filter layer and the fine filter layer are respectively provided at both ends of the filter and fixedly connected to the filter body through the connecting flanges.

[0010] Furthermore, the coarse filter layer includes a coarse filter section and a first connecting end cap. The coarse filter section is a steel wire mesh with a pore size of 50-100μm. The inner wall of the first connecting end cap is provided with an annular groove, and the steel wire mesh is fixed to the inner wall of the first connecting end cap through the annular groove. The first connecting end cap is connected to the flange of the filter body by bolts. The fine filter layer includes a second connecting end cap and a fine filter section. The second connecting end cap is connected to the flange of the filter body, and the fine filter section is fixedly disposed on the second connecting end cap. The pore size of the fine filter section is less than 1μm.

[0011] Furthermore, it also includes a backwashing unit, which comprises a differential pressure sensor and a backwashing pump. The differential pressure sensor is located at both the feed and discharge ends of the filter and can detect the pressure difference between them. A filtrate collection chamber is provided within the housing, connected to the filter's discharge side and capable of collecting the filtrate. The backwashing pump is positioned between the filtrate collection chamber and the filter, and can transport the filtrate from the collection chamber to the discharge side of the fine filtration layer. By implementing the backwashing unit, the filter is automatically cleaned using reverse flow, replacing manual disassembly and cleaning. Backwashing time is reduced from 1-2 hours to 5-10 minutes, continuous equipment operation time is extended by 80%, and labor costs are reduced by 90%. Simultaneously, using the filtered cleaning liquid for backwashing avoids the introduction of new impurities by traditional chemical cleaning, ensuring filtration safety.

[0012] Furthermore, it also includes a cleaning chamber, which is located between the filter and the filtrate collection chamber and is connected to both the filter and the filtrate collection chamber respectively. The cleaning chamber is also connected to a backwash pump.

[0013] Furthermore, the backwashing unit also includes a pulse air valve, which is electrically connected to the differential pressure sensor and connected to compressed air. The pulse air valve is installed on the cavity and can be activated when the pressure difference detected by the differential pressure sensor exceeds the set value, and compressed air is introduced into the cavity.

[0014] Furthermore, the pulse valve is activated as follows: when the pulse valve receives a start signal, it starts at a frequency of 5-10 Hz.

[0015] Furthermore, the backwashing unit also includes an ultrasonic vibration module, which is located inside the cavity and electrically connected to the differential pressure sensor.

[0016] Furthermore, it also includes a control module, which includes a solenoid valve and a PLC controller. The solenoid valve is located between the cleaning chamber and the filtrate collection chamber and can switch the connection state between the cleaning chamber and the filtrate collection chamber. The PLC controller is electrically connected to the differential pressure sensor, the solenoid valve, the backwash pump, and the ultrasonic vibration module.

[0017] In conjunction with the above technical features, this solution also includes the following technical effects:

[0018] 1. By integrating a PLC controller, it is possible to optimize filtering parameters in real time and adapt to different usage environments;

[0019] 2. By setting the differential pressure sensor and linking it with the PLC controller, the backwashing program can be automatically started when the filtration resistance exceeds the preset value (such as 0.3MPa), thereby reducing manual intervention and improving filtration efficiency;

[0020] 3. Through the three-layer composite filter media design, it can achieve efficient separation of precipitates of different particle sizes. A single filtration can meet the high purity requirements of pharmaceuticals, semiconductors and other industries, eliminating the need for multi-stage filtration and reducing costs by 40%. Attached Figure Description

[0021] Figure 1 This is a schematic diagram of the connection relationship in Embodiment 1 of this utility model;

[0022] Figure 2 This is a schematic diagram of the connection relationship in Embodiment 2 of this utility model;

[0023] Figure 3 This is a schematic diagram of the connection relationship in Embodiment 3 of this utility model.

[0024] The reference numerals in the accompanying drawings include: feed pipe 11, cleaning chamber 12, filtrate collection chamber 13, coarse filter layer 21, adsorption layer 22, fine filter layer 23, differential pressure sensor 31, backwash pump 32, pulse air valve 33, PLC controller 41, and solenoid valve 42. Detailed Implementation

[0025] Example 1

[0026] Example 1 is basically as shown in the appendix. Figure 1 As shown, Figure 1 The filtration device shown includes a device body and a filter. The device body includes a housing, and a filtrate collection chamber 13 is provided inside the housing. An inlet is provided on the housing, and the inlet is connected to an inlet pipe 11. Specifically, the housing is a carbon steel cylinder with a wall thickness of 10 mm and an inner wall coated with a 0.5 mm thick polytetrafluoroethylene anti-corrosion coating. The inlet is a carbon steel cylinder with a welded top and a pipe diameter of DN100. The inlet flange is connected to the inlet pipe 11. The volume of the filtrate collection chamber 13 is 20 L.

[0027] The filter includes a filter body and a composite filter layer. The filter body has connecting flanges at both ends. The composite filter layer includes a coarse filter layer 21, an adsorption layer 22, and a fine filter layer 23 arranged sequentially. A gap of 5-10 mm is reserved between the coarse filter layer 21, the adsorption layer 22, and the fine filter layer 23. In this embodiment, the gap between the coarse filter layer 21, the adsorption layer 22, and the fine filter layer 23 is 8 mm. The coarse filter layer 21 and the fine filter layer 23 are respectively located at both ends of the filter and fixedly connected to the filter body via connecting flanges. Specifically, the filter body is a stainless steel cylinder with an outer diameter of φ300 mm, a height of 500 mm, and connecting flanges at both ends.

[0028] The coarse filter layer 21 includes a coarse filter section and a first connecting end cap. The coarse filter section is a steel wire mesh with a pore size of 50-100μm. Specifically, the coarse filter section is a 316L stainless steel wire mesh with a wire diameter of 0.2mm and a mesh size of 50μm. The surface of the wire mesh is coated with a 50μm thick nano-tungsten carbide coating. An annular groove is provided on the inner wall of the first connecting end cap. The wire mesh is fixed to the inner wall of the first connecting end cap through the annular groove. The first connecting end cap is connected to the flange of the filter body by bolts. The fine filter layer 23 includes a second connecting end cap and a fine filter section. The second connecting end cap is connected to the flange of the filter body. The fine filter section is fixedly disposed on the second connecting end cap. The fine filter section is made of nanofiber membrane or silicon carbide ceramic filter membrane with a pore size of less than 1μm. In this embodiment, the material of the fine filter section is silicon carbide ceramic filter membrane. The adsorption layer 22 includes a porous polytetrafluoroethylene frame. The outer edge of the porous polytetrafluoroethylene frame is fixedly connected to the filter body, and the interior is filled with a mixed filler of magnetic nanoparticles and activated carbon.

[0029] This embodiment forms a layered filtration system of "screening, adsorption, and filtration" by setting up a coarse filter layer 21, an adsorption layer 22, and a fine filter layer 23. Through the layered filtration system, large particles on the outer coarse filter layer 21 are quickly intercepted, avoiding clogging of the inner adsorption layer 22 and fine filter layer 23, thereby increasing the overall filtration throughput by 50%. The magnetic nanoparticles and activated carbon mixed filler filling the adsorption layer 22 can actively adsorb charged colloids and nanoparticles, making up for the defects of insufficient pore size of traditional filter materials. The nanoscale filter membrane accurately intercepts tiny impurities, and the filtration accuracy is 10 times higher than that of traditional equipment, meeting the high purity requirements of pharmaceuticals, semiconductors, etc., and thus adapting to precipitates with different particle size distributions, eliminating the need for frequent replacement of filter materials according to operating conditions.

[0030] In use, the material enters the feed inlet through the feed pipe 11 and passes through the coarse filter layer 21, the adsorption layer 22 and the fine filter layer 23 in sequence, reaching the filtrate collection chamber 13. Large particles are quickly intercepted in the outer coarse filter layer 21, preventing the inner adsorption layer 22 and fine filter layer 23 from clogging. Subsequently, the adsorption layer 22 actively adsorbs charged colloids and nanoparticles, making up for the defects of insufficient pore size in traditional filter materials. Finally, the fine filter layer 23 accurately intercepts tiny impurities, thereby meeting the high purity requirements of pharmaceuticals, semiconductors and other industries.

[0031] Example 2

[0032] Example 2 is basically the same as Example 1, except that, as Figure 2 As shown, it also includes a backwashing unit and a control module. The backwashing unit includes a differential pressure sensor 31 and a backwashing pump 32. The differential pressure sensor 31 is installed at the feed end and the discharge end of the filter and can detect the pressure difference between the feed end and the discharge end of the filter. A filtrate collection chamber 13 is provided inside the housing. The filtrate collection chamber 13 is connected to the discharge side of the filter and can collect the filtrate of the filter. The backwashing pump 32 is installed between the filtrate collection chamber 13 and the cleaning chamber 12 and can transport the filtrate in the filtrate collection chamber 13 to the discharge side of the fine filter layer 23.

[0033] The control module includes a solenoid valve 42 and a PLCPLC controller 41. The solenoid valve 42 is located between the cleaning chamber 12 and the filtrate collection chamber 13 and is in a continuously open state. The PLCPLC controller 41 has a preset value and is electrically connected to the solenoid valve 42, the differential pressure sensor 31, and the backwash pump 32. It can control the solenoid valve 42 and the backwash pump 32 to start based on the differential pressure value sent by the differential pressure sensor 31. In this embodiment, the preset value of the PLCPLC controller 41 is 0.3 MPa.

[0034] When the PLCPLC controller 41 receives a pressure difference sent by the differential pressure sensor 31 that exceeds the preset value, that is, when the pressure difference across the filter is greater than 0.3 MPa, the PLCPLC controller 41 controls the solenoid valve 42 to close and controls the backwash pump 32 to transport the filtrate in the filtrate collection chamber 13 to the cleaning chamber 12, thereby increasing the pressure in the cleaning chamber 12, and causing the filtrate to flow from the outlet side of the fine filter layer 23 to the inlet side of the coarse filter layer 21, achieving deep cleaning "from the inside out".

[0035] Example 3

[0036] Based on Example 2, such as Figure 3 As shown, the backwashing unit also includes a pulse air valve 33 and an ultrasonic vibration module. The pulse air valve 33 is installed on the cavity and connected to compressed air. The ultrasonic vibration module includes several ultrasonic transducers, which are installed inside the cavity. Both the pulse air valve 33 and the ultrasonic vibration module are electrically connected to the PLC controller 41.

[0037] When the pressure difference detected by the differential pressure sensor 31 exceeds the set value, the PLC controller 41 synchronously starts the pulse air valve 33, the ultrasonic transducer, and the backwash pump 32, forming a coordinated cleaning process of "air vibration-acoustic vibration-liquid flushing". Specifically, the PLC controller 41 controls the pulse air valve 33 and the ultrasonic vibration module to start. When the pulse air valve 33 starts, compressed air is introduced into the cleaning chamber 12. The starting method of the pulse air valve 33 is as follows: when the pulse air valve 33 receives the start signal, the pulse air valve 33 starts at a frequency of 5-10HZ. This introduces compressed air into the chamber. At the same time, the backwash pump 32 transports the filtrate in the filtrate collection chamber 13 to the cleaning chamber 12. The filtrate in the cleaning chamber 12 is subjected to the mechanical vibration of the ultrasonic transducer and the vibration of the ultrasonic transducer is transmitted to the filter. Thus, the vibration of the compressed air and the mechanical vibration loosen the stubborn particles in the pores of the filter material, and the reverse flow of the clean filtrate discharges the detached impurities from the feed port.

[0038] The above descriptions are merely embodiments of this utility model. Commonly known technical solutions and / or characteristics are not described in detail here. It should be noted that the technical means used to solve problems in the above embodiments of this utility model can be combined to solve multiple technical problems simultaneously. For those skilled in the art, several modifications and improvements can be made without departing from the technical solution of this utility model, and these should also be considered within the scope of protection of this utility model. These modifications will not affect the effectiveness of the implementation of this utility model or the practicality of the patent. The scope of protection claimed in this application should be determined by the content of its claims, and the specific embodiments described in the specification can be used to interpret the content of the claims.

Claims

1. A filtration device, characterized in that: The device includes a main body and a filter. The main body includes a housing with a feed inlet. The filter includes a filter body, which is located inside the housing and communicates with the feed inlet. A composite filter layer is fixedly arranged on the filter body. The composite filter layer includes a coarse filter layer, an adsorption layer, and a fine filter layer arranged in sequence, with gaps between the coarse filter layer, the adsorption layer, and the fine filter layer.

2. The filtration device according to claim 1, characterized in that: The adsorption layer includes a porous polytetrafluoroethylene (PTFE) framework, the outer edge of which is fixedly connected to the filter body, and the interior is filled with a mixture of magnetic nanoparticles and activated carbon.

3. A filtration device according to claim 2, characterized in that: The filter body is equipped with connecting flanges at both ends. The coarse filter layer and the fine filter layer are respectively located at both ends of the filter and are fixedly connected to the filter body through the connecting flanges.

4. A filtration device according to claim 3, characterized in that: The coarse filter layer includes a coarse filter section and a first connecting end cap. The coarse filter section is a steel wire mesh with a pore size of 50-100μm. The inner wall of the first connecting end cap is provided with an annular groove, and the steel wire mesh is fixed to the inner wall of the first connecting end cap through the annular groove. The first connecting end cap is connected to the flange of the filter body by bolts. The fine filter layer includes a second connecting end cap and a fine filter section. The second connecting end cap is connected to the flange of the filter body, and the fine filter section is fixedly disposed on the second connecting end cap. The pore size of the fine filter section is less than 1μm.

5. A filtration device according to claim 1, characterized in that: It also includes a backwashing unit, which includes a differential pressure sensor and a backwashing pump. The differential pressure sensor is installed at the feed end and discharge end of the filter and can detect the pressure difference between the feed end and discharge end of the filter. A filtrate collection chamber is provided inside the housing. The filtrate collection chamber is connected to the discharge side of the filter and can collect the filtrate from the filter. The backwashing pump is installed between the filtrate collection chamber and the filter and can transport the filtrate in the filtrate collection chamber to the discharge side of the fine filter layer.

6. A filtration device according to claim 5, characterized in that: It also includes a cleaning chamber, which is located between the filter and the filtrate collection chamber and is connected to both the filter and the filtrate collection chamber respectively. The cleaning chamber is also connected to a backwash pump.

7. A filtration device according to claim 6, characterized in that: The backwashing unit also includes a pulse air valve, which is electrically connected to the differential pressure sensor and connected to compressed air. The pulse air valve is installed on the cavity and can be activated when the pressure difference detected by the differential pressure sensor exceeds the set value, and compressed air is introduced into the cavity.

8. A filtration device according to claim 7, characterized in that: The pulse air valve is activated as follows: when the pulse air valve receives a start signal, it starts at a frequency of 5-10 Hz.

9. A filtration device according to claim 8, characterized in that: The backwashing unit also includes an ultrasonic vibration module, which is located inside the cavity and electrically connected to the differential pressure sensor.

10. A filtration device according to claim 9, characterized in that: It also includes a control module, which includes a solenoid valve and a PLC controller. The solenoid valve is located between the cleaning chamber and the filtrate collection chamber and can switch the connection state between the cleaning chamber and the filtrate collection chamber. The PLC controller is electrically connected to the differential pressure sensor, the solenoid valve, the backwash pump, and the ultrasonic vibration module.

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