A PFA filtration device

Abstract

This invention provides a PFA filtration device, including a housing, a columnar filter element inside the housing, a raw liquid chamber formed between the housing and the filter element, and a pure liquid chamber formed inside the filter element. The raw liquid chamber is connected to a raw liquid connector and a discharge connector, and the pure liquid chamber is connected to a pure liquid connector. A first pressure wave generating component and a second pressure wave generating component are respectively provided at the first and second ends of the pure liquid chamber. The pressure waves generated by the first and second pressure wave generating components can collide within the pure liquid chamber, thereby generating a disturbance wave that expands radially along the filter element at the point of collision. The first and second pressure wave generating components are electrically connected to a control module, which can control the excitation sequence of the first and second pressure wave generating components, as well as their positions radially along the filter element. This invention can effectively solve the problems of incomplete cleaning and poor performance in mainstream cleaning methods.

Description

Technical Field

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

[0002] PFA filtration devices, with their excellent chemical corrosion resistance, high cleanliness, and structural stability, are widely used in many fields with stringent requirements for filtration precision and media compatibility. In the semiconductor industry, they are commonly used for filtering high-purity chemicals such as ultrapure water, hydrofluoric acid, and ammonia, effectively intercepting particulate impurities to prevent wafer contamination and ensure the quality of semiconductor device manufacturing. In the biopharmaceutical field, leveraging their aseptic properties, they are widely used in critical processes such as aseptic filtration and cell culture medium treatment to prevent impurities from affecting drug purity and safety. In the chemical industry, they are suitable for precision filtration of highly corrosive media such as concentrated sulfuric acid and organic solvents, achieving efficient retention of impurities in corrosive fluids. In the food and beverage industry, they are mostly used for the final filtration of high-purity additives or sensitive liquids to ensure the quality and safety of food and beverages.

[0003] However, during long-term use, PFA filter cartridges are prone to clogging due to the continuous trapping of impurities. Currently, the mainstream unclogging method in the industry is overall backflushing, which involves reversing the flow of flushing fluid to clear the entire filter cartridge. However, this method has a significant drawback: the flow resistance is high in severely clogged areas, causing the flushing fluid to preferentially flow through less clogged and lower-resistance areas, resulting in extremely uneven distribution within the filter cartridge. This uneven distribution of the flushing fluid means that critically clogged areas cannot receive sufficient backflushing force, leading to incomplete unclogging and poor results—not only affecting the lifespan of the filter cartridge but also potentially disrupting subsequent production processes due to decreased filtration efficiency. Summary of the Invention

[0004] To overcome the shortcomings of existing technologies, this invention provides a PFA filtration device that can effectively solve the problems of incomplete clogging and poor performance in mainstream clogging methods.

[0005] The present invention adopts the following technical solution.

[0006] A PFA filtration device includes a housing, a columnar filter element disposed inside the housing, a raw liquid chamber formed between the housing and the filter element, a pure liquid chamber formed inside the filter element, the raw liquid chamber being connected to a raw liquid connector and a waste discharge connector, and the pure liquid chamber being connected to a pure liquid connector.

[0007] The first end and the second end of the pure liquid chamber are respectively provided with a first pressure wave generating component and a second pressure wave generating component;

[0008] The pressure waves generated by the first pressure wave generating component and the second pressure wave generating component can collide within the pure liquid chamber, thereby generating a disturbance wave that expands radially along the filter element at the pressure wave collision point.

[0009] The first pressure wave generating component and the second pressure wave generating component are electrically connected to a control module. The control module can control the excitation timing of the first pressure wave generating component and the second pressure wave generating component, as well as their positions in the radial direction of the filter element.

[0010] Furthermore, both the first pressure wave generating component and the second pressure wave generating component include a body. The body is provided with a transmission channel and a pressure chamber that are connected to each other. The transmission channel extends along the axial direction of the filter element. The pressure chamber is provided with an actuator, a first reflective wall and a second reflective wall. The first reflective wall and the second reflective wall have overlapping focal points.

[0011] The actuator is capable of emitting pressure waves toward the first reflective wall;

[0012] The first reflector wall can reflect the received pressure wave to the second reflector wall;

[0013] The second reflector can reflect the received pressure wave back to the transmission channel in a direction parallel to the axis of the transmission channel.

[0014] Furthermore, the first pressure wave generating component and the second pressure wave generating component also include a rotating seat and a swinging seat, as well as a rotating power component that is drivenly connected to the rotating seat and a swinging power component that is drivenly connected to the swinging seat. The axis of the rotating seat is collinearly aligned with the axis of the filter element. The swinging seat and the rotating seat are eccentrically arranged. The main body is disposed on the swinging seat. The swinging seat has a first position and a second position.

[0015] When the oscillating seat is in the first state position, the centerline of the emission channel is collinearly aligned with the centerline of the filter element.

[0016] When the swivel seat is in the second state position, there is a radial offset between the axis of the emission channel and the axis of the filter element.

[0017] The rotary power component can drive the rotating seat to rotate around its axis;

[0018] The swing power component can drive the swing seat to reciprocate between the first state position and the second state position.

[0019] Furthermore, the first pressure wave generating component and the second pressure wave generating component have a first unblocking mode. In the first unblocking mode, the propagation trajectory of the pressure waves generated by the first pressure wave generating component and the second pressure wave generating component coincides with the axis of the filter element.

[0020] Furthermore, the first pressure wave generating component and the second pressure wave generating component have a second unblocking mode. In the second unblocking mode, the propagation trajectory of the pressure wave generated by the first pressure wave generating component and the second pressure wave generating component is collinearly aligned along the filter core axis and has a radial offset from the filter core axis.

[0021] Furthermore, the impurity discharge connector is connected to an impurity pressure sensing element, and the pure liquid connector is connected to a pure liquid pressure sensing element. Both the impurity pressure sensing element and the pure liquid pressure sensing element are electrically connected to the control module.

[0022] Furthermore, the control module is capable of performing the following operations:

[0023] S1. Divide the filter element into multiple layers to be cleaned along its axial direction;

[0024] The control module controls the first pressure wave generating component and the second pressure wave generating component to switch to the first unblocking mode, and controls the excitation timing of the two to make the pressure wave collision points generated by the two sequentially traverse each layer to be unblocked.

[0025] After traversing all the layers to be cleared at the pressure wave collision point, several layers to be cleared are identified as key layers to be cleared based on the pressure values ​​measured by the impurity pressure sensing element and the pure liquid pressure sensing element.

[0026] S2. Divide the key unblocking layer into multiple unblocking units along its circumference;

[0027] The control module controls the first pressure wave generating component and the second pressure wave generating component to switch to the second unclogging mode, and controls their positions in the radial direction of the filter element so that the pressure wave collision points generated by the two components sequentially traverse each unclogging unit.

[0028] After traversing all the units to be cleared at the pressure wave collision point, several units to be cleared are identified as key units for clearing based on the pressure values ​​measured by the impurity pressure sensing element and the pure liquid pressure sensing element.

[0029] S3. The control module controls the first pressure wave generating component and the second pressure wave generating component to continue the second unblocking mode, and controls the excitation timing and the position of the two components in the radial direction of the filter core so that the pressure wave collision points generated by the two components sequentially traverse each key unblocking unit.

[0030] The beneficial effects of this invention are as follows:

[0031] During the unblocking operation, firstly, the control module controls the first pressure wave generating component and the second pressure wave generating component to switch to the first unblocking mode, and by adjusting the excitation timing of the two, the generated pressure wave collision points sequentially traverse each layer to be unblocked; after the pressure wave collision points have traversed all layers to be unblocked, based on the pressure values ​​measured by the impurity pressure sensing element and the pure liquid pressure sensing element, several layers to be unblocked are identified as key unblocking layers.

[0032] Next, the control module controls the first pressure wave generating component and the second pressure wave generating component to switch to the second unclogging mode, and controls their radial positions on the filter element so that the pressure wave collision points generated by the two components sequentially traverse each unit to be unclogging; after the pressure wave collision points have traversed all units to be unclogging, based on the pressure values ​​measured by the impurity pressure sensing element and the pure liquid pressure sensing element, several units to be unclogging are identified as key unclogging units.

[0033] Finally, the control module controls the first pressure wave generating component and the second pressure wave generating component to continue the second unblocking mode, and controls the excitation timing and the position of the two components in the radial direction of the filter element so that the pressure wave collision points generated by the two components sequentially traverse each key unblocking unit.

[0034] In the first unclogging mode, the propagation trajectories of the pressure waves generated by the first and second pressure wave generating components both coincide with the axis of the filter element, and the collision point of the pressure waves generated by both is also located on the axis of the filter element. In this scenario, the distance from the pressure wave collision point to each region of the circumference of the layer to be unclogging is equal. The disturbance wave generated at the pressure wave collision point, expanding radially along the filter element, will act uniformly on the layer to be unclogging, creating a uniformly distributed recoil force in each region of the circumference of the layer. This helps ensure that the impurities trapped inside the filter element receive sufficient recoil force and are effectively stripped away, achieving overall unclogging of the layer to be unclogging.

[0035] In the second unblocking mode, the pressure waves generated by the first and second pressure wave generating components have propagation trajectories that are collinearly aligned along the filter core axis and radially offset from the filter core's centerline. The collision point of these pressure waves also has a radial offset from the filter core's centerline. In this scenario, the radial distance from the pressure wave collision point to different areas along the circumference of the unblocked layer varies—the area closest to the collision point experiences the greatest recoil force, while the force on farther areas gradually decreases. Based on this, by controlling the position of the pressure wave collision point to be closer to the key unblocking unit, a higher recoil force can be applied to the key unblocking unit, enabling targeted unblocking of that unit.

[0036] This invention effectively solves the problems of incomplete and ineffective clearing in mainstream clearing methods by combining overall clearing with targeted clearing. Attached Figure Description

[0037] To more clearly illustrate the technical solutions in the embodiments of the present invention or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, for those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0038] Figure 1 This is one of the structural schematic diagrams of this embodiment (at this time, the first pressure wave generating component and the second pressure wave generating component are in the first unblocking mode);

[0039] Figure 2 for Figure 1 Enlarged view of part A;

[0040] Figure 3 This is the second structural schematic diagram of this embodiment (at this time, the first pressure wave generating component and the second pressure wave generating component are in the second unblocking mode).

[0041] Explanation of reference numerals in the attached figures:

[0042] 1. Shell;

[0043] 11. Raw material connector; 12. Impurity discharge connector; 13. Pure liquid connector;

[0044] 2. Filter element;

[0045] 3. Original liquid chamber;

[0046] 4. Pure liquid chamber;

[0047] 51. First pressure wave generating component; 52. Second pressure wave generating component;

[0048] 501. Main body; 5011. Launch channel; 5012. Pressure chamber; 5013. First reflective wall; 5014. Second reflective wall;

[0049] 502. Actuator; 503. Rotary seat; 504. Swing seat; 505. Rotational power component; 506. Swinging power component;

[0050] 61. Raw liquid pressure sensor element; 62. Impurity pressure sensor element; 63. Pure liquid pressure sensor element. Detailed Implementation

[0051] The accompanying drawings are for illustrative purposes only and should not be construed as limiting the scope of this patent. To better illustrate this embodiment, some parts in the drawings may be omitted, enlarged, or reduced, and do not represent the actual dimensions of the product.

[0052] It will be understood by those skilled in the art that certain well-known structures and their descriptions may be omitted in the accompanying drawings. The technical solution of the present invention will be further described below with reference to the accompanying drawings and embodiments.

[0053] As shown in the attached figure, a PFA filtration device includes a housing 1, a columnar filter element 2 inside the housing 1, a raw liquid chamber 3 between the housing 1 and the filter element 2, a pure liquid chamber 4 inside the filter element 2, a raw liquid connector 11 and a waste discharge connector 12 connected to the raw liquid chamber 3, and a pure liquid connector 13 connected to the pure liquid chamber 4.

[0054] The first end and the second end of the pure liquid chamber 4 are respectively provided with a first pressure wave generating component 51 and a second pressure wave generating component 52;

[0055] The pressure waves generated by the first pressure wave generating component 51 and the second pressure wave generating component 52 can collide within the pure liquid chamber 4, thereby generating a disturbance wave that expands radially along the filter element 2 at the pressure wave collision point.

[0056] The first pressure wave generating component 51 and the second pressure wave generating component 52 are electrically connected to a control module. The control module can control the excitation timing of the first pressure wave generating component 51 and the second pressure wave generating component 52, as well as their radial positions in the filter element 2.

[0057] The pressure wave collision point refers to the specific spatial region where the pressure waves generated by the first pressure wave generating component 51 and the second pressure wave generating component 52 meet and collide during propagation. Specifically, the first pressure wave generating component 51 generates a first pressure wave along the axial direction of the filter element 2, approaching the second pressure wave generating component 52, while the second pressure wave generating component 52 generates a second pressure wave along the axial direction of the filter element 2, approaching the first pressure wave generating component 51. When the crests of the first and second pressure waves meet at the pressure wave collision point, they cannot continue to propagate axially, and their energy is released in the direction of least resistance (i.e., the radial direction of the filter element 2), thereby generating a disturbance wave that expands radially along the filter element 2. This disturbance wave acts on the filter element 2 near the pressure wave collision point, exerting outward pressure on the impurities trapped inside the filter element 2, ultimately stripping away the impurities and clearing the filter element 2.

[0058] Furthermore, by controlling the excitation timing of the first pressure wave generating component 51 and the second pressure wave generating component 52 through the control module, the position of the pressure wave collision point along the axial direction of the filter element 2 can be controlled. For example, in a homogeneous medium, the velocity v of the pressure wave is constant, x is the propagation distance, and the propagation time t = x / v. Assuming that the distances from the first pressure wave generating component 51 and the second pressure wave generating component 52 to the midpoint of the filter element 2 are equal: if both are excited simultaneously, the first pressure wave and the second pressure wave will travel the same distance before meeting, and the pressure wave collision point will be located at the midpoint of the filter element 2; if the first pressure wave generating component 51 is excited first, the distance the first pressure wave travels before meeting will be greater than that of the second pressure wave, and the pressure wave collision point will be closer to the second end of the pure liquid chamber 4; conversely, if the second pressure wave generating component 52 is excited before the first pressure wave generating component 51, the second pressure wave will travel a longer distance, and the pressure wave collision point will be closer to the first end of the pure liquid chamber 4.

[0059] As an optimization, the control module can also control the initial intensity of the pressure waves generated by the first pressure wave generating component 51 and the second pressure wave generating component 52, ensuring that their intensity remains constant when they reach the pressure wave collision point, thereby ensuring the stability of the disturbance wave. Specifically, the initial intensity of the pressure waves generated by the first pressure wave generating component 51 and the second pressure wave generating component 52 can be calculated using the following formula: P0 = P (X) e ax ;

[0060] Where P0 is the initial intensity of the pressure wave, P (X) Let α be the target intensity of the pressure wave at the point of impact, α be the attenuation coefficient of the propagation medium, and x be the propagation distance of the pressure wave from its generating component to the point of impact.

[0061] For example, if the intensity of the pressure wave at the point of impact needs to be maintained at 1 MPa, the distance from the first pressure wave generating component 51 to the point of impact is 2 m, and the attenuation coefficient of the propagation medium is 0.3 dB / m, then the control module will calculate and control the initial intensity of the pressure wave generated by the first pressure wave generating component 51 to be P0 = 1 × e0.3 × 2 ≈ 1.82 MPa.

[0062] Furthermore, by controlling the radial positions of the first pressure wave generating component 51 and the second pressure wave generating component 52 in the filter element 2 via the control module, the radial position of the pressure wave collision point in the filter element 2 can be controlled. It should be noted that the area on the filter element 2 closest to the pressure wave collision point will experience the greatest compressive force; as the distance from the collision point increases, the force on this area gradually decreases.

[0063] Preferably, both the first pressure wave generating component 51 and the second pressure wave generating component 52 include a body 501. The body 501 is provided with a transmission channel 5011 and a pressure chamber 5012 that are connected to each other. The transmission channel 5011 extends along the axial direction of the filter element 2. The pressure chamber 5012 is provided with an actuator 502, a first reflective wall 5013 and a second reflective wall 5014. The first reflective wall 5013 and the second reflective wall 5014 are provided with overlapping focal points.

[0064] Actuator 502 can emit pressure waves toward the first reflective wall 5013;

[0065] The first reflector 5013 can reflect the received pressure wave to the second reflector 5014;

[0066] The second reflector 5014 can reflect the received pressure wave back to the transmission channel 5011 along a direction parallel to the axis of the transmission channel 5011.

[0067] Understandably, the actuator 502 first emits a dispersed pressure wave toward the first reflector 5013. Given that the first reflector 5013 and the second reflector 5014 have a common focal point, the dispersed pressure wave, after being reflected by the first reflector 5013, converges at this focal point, achieving energy concentration. Next, the pressure wave converged at the focal point continues to propagate to the second reflector 5014, achieving pressure wave convergence. Finally, the second reflector 5014 collimates the converged pressure wave into a parallel wave parallel to the axis of the emission channel 5011, and outputs it along the emission channel 5011. This not only facilitates precise control of the pressure wave propagation direction but also significantly improves the energy concentration and utilization efficiency of the pressure wave.

[0068] In this embodiment, the actuator 502 is a ring-shaped piezoelectric element. When a voltage is applied, the piezoelectric element will stretch and deform along its thickness direction, thereby generating a pressure wave.

[0069] Preferably, the first pressure wave generating component 51 and the second pressure wave generating component 52 further include a rotating seat 503 and a swing seat 504, a rotating power component 505 that is pulsatorically connected to the rotating seat 503, and a swing power component 506 that is pulsatorically connected to the swing seat 504. The axis of the rotating seat 503 is collinearly aligned with the axis of the filter element 2. The swing seat 504 is eccentrically arranged with the rotating seat 503. The body 501 is disposed on the swing seat 504. The swing seat 504 is provided with a first position and a second position.

[0070] When the swing seat 504 is in the first state position, the axis of the emission channel 5011 is collinearly aligned with the axis of the filter element 2.

[0071] When the swing seat 504 is in the second state position, there is a radial offset between the axis of the transmission channel 5011 and the axis of the filter element 2.

[0072] The rotating power component 505 can drive the rotating seat 503 to rotate around its axis;

[0073] The swing power component 506 can drive the swing base 504 to reciprocate between the first state position and the second state position.

[0074] In this embodiment, the rotating power component 505 is a servo motor, and the swinging power component 506 is a rotary electromagnet.

[0075] Preferably, the first pressure wave generating component 51 and the second pressure wave generating component 52 have a first unblocking mode. In the first unblocking mode, the propagation trajectories of the pressure waves generated by the first pressure wave generating component 51 and the second pressure wave generating component 52 coincide with the axis of the filter element 2. It is understood that when the first pressure wave generating component 51 and the second pressure wave generating component 52 are in the first unblocking mode, the swing seat 504 is in the first state position.

[0076] Preferably, the first pressure wave generating component 51 and the second pressure wave generating component 52 have a second unblocking mode. In the second unblocking mode, the propagation trajectories of the pressure waves generated by the first pressure wave generating component 51 and the second pressure wave generating component 52 are collinearly aligned along the axial direction of the filter element 2, and have a radial offset from the centerline of the filter element 2. It is understood that when the first pressure wave generating component 51 and the second pressure wave generating component 52 are in the second unblocking mode, the swing seat 504 is in the second state position.

[0077] Preferably, the impurity discharge connector 12 is connected to an impurity pressure sensing element 62, and the pure liquid connector 13 is connected to a pure liquid pressure sensing element 63. Both the impurity pressure sensing element 62 and the pure liquid pressure sensing element 63 are electrically connected to the control module.

[0078] As an optimization, the raw liquid connector 11 is connected to a raw liquid pressure sensor element 61, which is electrically connected to the control module.

[0079] When the device is operating normally, the raw liquid enters the raw liquid chamber 3 through the raw liquid connector 11, then passes through the filter element 2 from the outside to the inside. After impurities are intercepted by the filter element 2, the resulting pure liquid enters the pure liquid chamber 4 and is finally discharged through the pure liquid connector 13. During this process, the impurity discharge connector 12 is always in the closed state.

[0080] When the control module detects that the pressure difference between the raw liquid pressure sensor element 61 and the pure liquid pressure sensor element 63 exceeds the threshold, it indicates that the filter element 2 has become clogged and needs to be cleaned. At this time, the raw liquid connector 11 is closed and the impurity discharge connector 12 is opened. The pure liquid used for cleaning enters from the pure liquid connector 13, then passes through the filter element 2 from the inside to the outside, and finally carries away the impurities that have been detached from the filter element 2 through the impurity discharge connector 12.

[0081] Preferably, the control module is capable of performing the following operations:

[0082] S1. Divide the filter element 2 into multiple layers to be cleaned along its axial direction;

[0083] The control module controls the first pressure wave generating component 51 and the second pressure wave generating component 52 to switch to the first unblocking mode, and controls the excitation timing of the two to make the pressure wave collision points generated by the two sequentially traverse each layer to be unblocked.

[0084] After traversing all the layers to be cleared at the pressure wave collision point, based on the pressure values ​​measured by the impurity pressure sensing element 62 and the pure liquid pressure sensing element 63, several layers to be cleared are identified as key layers to be cleared.

[0085] S2. Divide the key unblocking layer into multiple unblocking units along its circumference;

[0086] The control module controls the first pressure wave generating component 51 and the second pressure wave generating component 52 to switch to the second unclogging mode, and controls their radial positions in the filter element 2 so that the pressure wave collision points generated by the two components sequentially traverse each unclogging unit.

[0087] After traversing all the units to be cleared at the pressure wave collision point, based on the pressure values ​​measured by the impurity pressure sensing element 62 and the pure liquid pressure sensing element 63, several units to be cleared are identified as key units to be cleared.

[0088] S3. The control module controls the first pressure wave generating component 51 and the second pressure wave generating component 52 to continue the second unblocking mode, and controls the excitation timing of the two and their radial positions in the filter element 2 so that the pressure wave collision points generated by the two sequentially traverse each key unblocking unit.

[0089] The process of making the pressure wave collision points generated by the two sequentially traverse each layer of the unblocked layer refers to changing the position of the pressure wave collision points along the axial direction of the filter element 2 so that the pressure wave collision points coincide with the centroid of each layer of the unblocked layer in sequence.

[0090] The process of causing the pressure wave collision points generated by the two components to sequentially traverse each unit to be cleared refers to changing the radial position of the pressure wave collision points on the filter element 2, so that the pressure wave collision points sequentially approach each unit to be cleared. Specifically, with the swing seat 504 in its second state position, when the rotating power component 505 drives the rotating seat 503 to rotate around its axis to a predetermined position, the first pressure wave generating component 51 and the second pressure wave generating component 52 are excited according to a predetermined timing sequence, thus enabling the pressure wave collision points to sequentially traverse each unit to be cleared.

[0091] Specifically, assuming the filter element 2 is divided into 5 layers to be cleaned along its axial direction, with each layer having a height of 0.1m; and each layer to be cleaned is planned to be divided into 6 units to be cleaned circumferentially, with each unit having a span of 60 degrees. The distance from the first pressure wave generating component 51 to the first end of the filter element 2 is 0.15m, and the distance from the second pressure wave generating component 52 to the second end of the filter element 2 is also 0.15m. The velocity v of the pressure wave is 1500m / s, the attenuation coefficient of the propagation medium is 0.3dB / m, and the intensity of the pressure wave at the pressure wave collision point remains at 1MPa. The cleaning operation in this embodiment is specifically divided into three steps:

[0092] Step 1: Clean the entire filter element 2 and identify the key areas to be cleaned:

[0093] The control module controls the first pressure wave generating component 51 and the second pressure wave generating component 52 to switch to the first unclogging mode. In this mode, for each layer to be unclogging, the first pressure wave generating component 51 and the second pressure wave generating component 52 will be excited multiple times in a predetermined sequence, generating disturbance waves that expand radially along the filter element 2 multiple times within the unclogging layer.

[0094] Taking the first layer of blockage to be cleared as an example: the distance from the first pressure wave generating component 51 to the centroid of the first layer of blockage to be cleared is 0.2m, and the distance from the second pressure wave generating component 52 to the centroid of the first layer of blockage to be cleared is 0.6m. According to the propagation time t = x / v, in order for the pressure waves generated by the first pressure wave generating component 51 and the second pressure wave generating component 52 to reach the centroid of the first layer of blockage to be cleared simultaneously, the second pressure wave generating component 52 needs to be excited approximately 266.7 microseconds earlier than the first pressure wave generating component 51 each time it is excited; and, according to P0 = P (X) e ax The initial intensity of the pressure wave generated by the first pressure wave generating component 51 needs to be 1.062 MPa, and the initial intensity of the pressure wave generated by the second pressure wave generating component 52 needs to be 1.197 MPa. After each excitation, there is a 2-second pause before the next excitation to eliminate the influence of the previous disturbance wave. This cycle is repeated 5 times to complete the traversal of the pressure wave collision point to the first layer of the blockage to be cleared.

[0095] Taking the second layer of blockage to be cleared as an example: the distance from the centroid of the first pressure wave generating component 51 to the second layer of blockage to be cleared is 0.3m, and the distance from the centroid of the second pressure wave generating component 52 to the centroid of the first layer of blockage to be cleared is 0.5m. Each time excitation occurs, the second pressure wave generating component 52 needs to be approximately 133.3 microseconds earlier than the first pressure wave generating component 51. The initial intensity of the pressure wave generated by the first pressure wave generating component 51 needs to be 1.094MPa, and the initial intensity of the pressure wave generated by the second pressure wave generating component 52 needs to be 1.162MPa.

[0096] The operation for the third, fourth, and fifth layers to be cleared is the same, and is omitted here.

[0097] Since the distance from the point of impact of the pressure wave to all areas circumferentially of the layer to be cleaned is equal, the disturbance wave generated at the point of impact, which expands radially along the filter element 2, will act uniformly on the layer to be cleaned, creating a uniformly distributed recoil force in all areas circumferentially of the layer. This helps ensure that impurities trapped in the filter element 2 receive sufficient recoil force, thereby being effectively stripped away and achieving overall cleaning of the filter element 2.

[0098] In addition, the control module determines the unblocking effect by collecting the pressure difference changes measured by the impurity pressure sensing element 62 and the pure liquid pressure sensing element 63 before and after the disturbance wave is applied to the unblocked layer multiple times. If the pressure difference change does not exceed the threshold, it is determined that the unblocked layer has not been effectively cleared and is still in a blocked state. Therefore, the unblocked layer is identified as a key unblocking layer.

[0099] For example, before the disturbance wave acts on the first layer to be cleared, the pressure measured by the impurity pressure sensing element 62 is 0.8 MPa, and the pressure measured by the pure liquid pressure sensing element 63 is 1 MPa, with a pressure difference of 0.2 MPa. When the filter element 2 is not clogged, the pressure measured by the impurity pressure sensing element 62 is 0.9 MPa, and the pressure measured by the pure liquid pressure sensing element 63 remains at 1 MPa, meaning the normal pressure difference for each layer to be cleared in the unclogged state is 0.02 MPa. After the disturbance wave acts on the layer to be cleared multiple times, the pressure measured by the impurity pressure sensing element 62 rises to 0.81 MPa, while the reading of the pure liquid pressure sensing element 63 remains unchanged at 1 MPa. At this point, the pressure difference change is only 0.01 MPa (the threshold is set to 0.02 MPa, which corresponds to the pressure difference change that should be achieved after the layer to be cleared is unblocked). Obviously, the change did not exceed the threshold, indicating that the blockage layer to be cleared has not been effectively cleared and is still blocked. Therefore, the first blockage layer to be cleared is identified as the key blockage layer to be cleared.

[0100] Step 2: Targeted cleaning of filter element 2 and identification of key cleaning units:

[0101] The control module controls the first pressure wave generating component 51 and the second pressure wave generating component 52 to switch to the second unclogging mode. In this mode, for each unclogging unit, when the first pressure wave generating component 51 and the second pressure wave generating component 52 are stationary at the corresponding positions of the unclogging unit along the rotating seat 503, they will be excited multiple times according to a predetermined sequence, generating disturbance waves that expand radially along the filter core 2 multiple times for the unclogging unit. At this time, the propagation trajectories of the pressure waves generated by the first pressure wave generating component 51 and the second pressure wave generating component 52 are collinearly aligned along the axial direction of the filter core 2 and have a radial offset from the axis of the filter core 2. The collision point of the pressure waves generated by the two components also has a radial offset from the axis of the filter core 2. In this case, there is a difference in the radial distance from the pressure wave collision point to the various regions in the circumferential direction of the unclogging layer—the region closest to the pressure wave collision point will bear the greatest recoil force, while the force on the regions farther away will gradually decrease. Based on this, by controlling the position of the pressure wave collision point and bringing it close to the unit to be cleaned, a high-intensity recoil force can be applied to the unit to be cleaned, thereby achieving targeted cleaning of the filter element 2.

[0102] Continuing with the example of the first layer of unblocked material to be cleared: This layer is divided into 6 unblocked units along its circumference, each unit spanning 60 degrees. With the swing seat 504 in its second state, when the rotating power component 505 drives the rotating seat 503 to rotate 60 degrees around its axis, the first pressure wave generating component 51 and the second pressure wave generating component 52 each perform the following operations 5 times or less: the second pressure wave generating component 52 should be activated approximately 266.7 microseconds earlier than the first pressure wave generating component 51; the initial intensity of the pressure wave generated by the first pressure wave generating component 51 is 1.062 MPa, and the initial intensity of the pressure wave generated by the second pressure wave generating component 52 is 1.197 MPa. After each activation, there is a 2-second pause before the next activation. When the rotating power component 505 drives the rotating seat 503 to rotate 360 ​​degrees around its axis, the pressure wave collision point has traversed all unblocked units.

[0103] In addition, the control module determines the unblocking effect by collecting the pressure difference changes measured by the impurity pressure sensing element 62 and the pure liquid pressure sensing element 63 before and after the disturbance wave is applied to the unit to be unblocked multiple times. If the pressure difference change does not exceed the threshold, it is determined that the unit to be unblocked has not been effectively unblocked and is still in a blocked state. Therefore, the unit to be unblocked is identified as a key unblocking unit.

[0104] For example, before the disturbance wave acts on the first unblocked unit of the first unblocked layer (i.e., the unblocked unit corresponding to when the rotating seat 503 rotates 60 degrees around its axis), the pressure measured by the impurity pressure sensing element 62 is 0.81 MPa, and the pressure measured by the pure liquid pressure sensing element 63 is 1 MPa. When the filter element 2 is not clogged, the pressure measured by the impurity pressure sensing element 62 is 0.9 MPa, and the pressure measured by the pure liquid pressure sensing element 63 is 1 MPa—wherein, the pressure difference between each unblocked layer is 0.02 MPa, which translates to 0.0033 MPa for each unblocked unit.

[0105] After the disturbance wave acted on the unit to be cleared multiple times, the pressure value measured by the impurity pressure sensing element 62 was 0.812 MPa, while the pressure value measured by the pure liquid pressure sensing element 63 remained at 1 MPa. At this time, the pressure difference change was only 0.002 MPa (the threshold was set at 0.0033 MPa, which corresponds to the pressure difference change that should occur after the unit to be cleared is restored). Obviously, this change did not exceed the threshold, indicating that the unit to be cleared had not been effectively cleared and was still in a blocked state. Therefore, this unit to be cleared was identified as a key unit for clearing.

[0106] III. Thorough unblocking of key congestion areas:

[0107] The control module controls the first pressure wave generating component 51 and the second pressure wave generating component 52 to continue the second unblocking mode. In this mode, for each key unblocking unit, when the first pressure wave generating component 51 and the second pressure wave generating component 52 are stationary at the position corresponding to the key unblocking unit with the rotating seat 503, they will be excited multiple times according to a predetermined sequence, generating disturbance waves that expand radially along the filter element 2 multiple times for the key unblocking unit. The control module determines the unblocking effect by collecting the pressure difference changes measured by the impurity pressure sensing element 62 and the pure liquid pressure sensing element 63 before and after the disturbance waves have acted on the key unblocking unit multiple times. If the pressure difference change does not exceed the threshold, it is determined that the key unblocking unit has not been effectively unblocked and is still in a blocked state. At this time, the first pressure wave generating component 51 and the second pressure wave generating component 52 will continue to be excited multiple times according to a predetermined sequence and continue to collect the pressure difference before and after the disturbance waves have acted on the unit until the pressure difference change exceeds the threshold, thereby achieving complete unblocking of the key unblocking unit.

[0108] Continuing with the above example, let's take the first unblocked unit (i.e., the key unblocked unit) of the first layer of unblocked material as an example. With the swing seat 504 in the second state position, when the rotating power component 505 drives the rotating seat 503 to rotate to a 60-degree position, the first pressure wave generating component 51 and the second pressure wave generating component 52 will perform a cyclic unblocking operation: the second pressure wave generating component 52 is activated approximately 266.7 microseconds earlier than the first pressure wave generating component 51. The initial intensity of the first pressure wave generating component 51 is set to 1.062 MPa, and the initial intensity of the second pressure wave generating component 52 is set to 1.197 MPa. After each activation, there is a 2-second pause before the next activation to eliminate residual fluctuation interference. After this cycle is repeated 5 times, the control module collects and analyzes the pressure difference data.

[0109] If the pressure difference change is still less than the threshold (0.0033 MPa) at this time, it is determined that the unblocking effect has not met the standard, and the key unblocking unit is still in a blocked state. The control module will automatically continue to trigger a new round of excitation cycle and continuously monitor the pressure difference change until the change exceeds 0.0033 MPa, indicating that the key unblocking unit has been completely unblocked.

[0110] Obviously, the above embodiments of the present invention are merely examples for clearly illustrating the present invention, and are not intended to limit the implementation of the present invention. Those skilled in the art can make other variations or modifications based on the above description. It is neither necessary nor possible to exhaustively describe all embodiments here. Any modifications, equivalent substitutions, and improvements made within the spirit and principles of the present invention should be included within the scope of protection of the claims of the present invention.

Claims

1. A PFA filtration device, characterized in that, The device includes a housing, a columnar filter element inside the housing, a raw liquid chamber between the housing and the filter element, a pure liquid chamber inside the filter element, a raw liquid connector and a waste discharge connector connected to the raw liquid chamber, and a pure liquid connector connected to the pure liquid chamber. The first end and the second end of the pure liquid chamber are respectively provided with a first pressure wave generating component and a second pressure wave generating component; The pressure waves generated by the first pressure wave generating component and the second pressure wave generating component can collide within the pure liquid chamber, thereby generating a disturbance wave that expands radially along the filter element at the pressure wave collision point. The first pressure wave generating component and the second pressure wave generating component are electrically connected to a control module. The control module can control the excitation timing of the first pressure wave generating component and the second pressure wave generating component, as well as their positions in the radial direction of the filter element. Both the first pressure wave generating component and the second pressure wave generating component include a body. The body is provided with a transmission channel and a pressure chamber that are connected to each other. The transmission channel extends along the axial direction of the filter element. The pressure chamber is provided with an actuator, a first reflective wall and a second reflective wall. The first reflective wall and the second reflective wall have overlapping focal points. The actuator is capable of emitting pressure waves toward the first reflective wall; The first reflector wall can reflect the received pressure wave to the second reflector wall; The second reflector can reflect the received pressure wave back to the transmission channel in a direction parallel to the axis of the transmission channel; The first pressure wave generating component and the second pressure wave generating component further include a rotating seat and a swinging seat, as well as a rotating power component that is driven to the rotating seat and a swinging power component that is driven to the swinging seat. The axis of the rotating seat is collinearly aligned with the axis of the filter element. The swinging seat and the rotating seat are eccentrically arranged. The main body is disposed on the swinging seat. The swinging seat has a first position and a second position. When the oscillating seat is in the first state position, the centerline of the emission channel is collinearly aligned with the centerline of the filter element. When the swivel seat is in the second state position, there is a radial offset between the axis of the emission channel and the axis of the filter element. The rotary power component can drive the rotating seat to rotate around its axis; The swing power component can drive the swing seat to reciprocate between the first state position and the second state position.

2. The PFA filtration device according to claim 1, characterized in that, The first pressure wave generating component and the second pressure wave generating component have a first unclogging mode. In the first unclogging mode, the propagation trajectory of the pressure waves generated by the first pressure wave generating component and the second pressure wave generating component coincides with the axis of the filter element.

3. A PFA filtration device according to claim 2, characterized in that, The first pressure wave generating component and the second pressure wave generating component have a second unblocking mode. In the second unblocking mode, the propagation trajectory of the pressure wave generated by the first pressure wave generating component and the second pressure wave generating component is collinearly aligned along the filter core axis and has a radial offset from the filter core axis.

4. A PFA filtration device according to claim 3, characterized in that, The impurity discharge connector is connected to an impurity pressure sensing element, and the pure liquid connector is connected to a pure liquid pressure sensing element. Both the impurity pressure sensing element and the pure liquid pressure sensing element are electrically connected to the control module.

5. A PFA filtration device according to claim 4, characterized in that, The control module is capable of performing the following operations: S1. Divide the filter element into multiple layers to be cleaned along its axial direction; The control module controls the first pressure wave generating component and the second pressure wave generating component to switch to the first unblocking mode, and controls the excitation timing of the two to make the pressure wave collision points generated by the two sequentially traverse each layer to be unblocked. After traversing all the layers to be cleared at the pressure wave collision point, several layers to be cleared are identified as key layers to be cleared based on the pressure values ​​measured by the impurity pressure sensing element and the pure liquid pressure sensing element. S2. Divide the key unblocking layer into multiple unblocking units along its circumference; The control module controls the first pressure wave generating component and the second pressure wave generating component to switch to the second unclogging mode, and controls their positions in the radial direction of the filter element so that the pressure wave collision points generated by the two components sequentially traverse each unclogging unit. After traversing all the units to be cleared at the pressure wave collision point, several units to be cleared are identified as key units for clearing based on the pressure values ​​measured by the impurity pressure sensing element and the pure liquid pressure sensing element. S3. The control module controls the first pressure wave generating component and the second pressure wave generating component to continue the second unblocking mode, and controls the excitation timing and the position of the two components in the radial direction of the filter core so that the pressure wave collision points generated by the two components sequentially traverse each key unblocking unit.

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