Corrosion-resistant grid groove type framework structure and filter element comprising same

Abstract

The invention discloses a corrosion-resistant grid groove type framework structure and a filter element comprising the same, the corrosion-resistant grid groove type framework structure comprises a filter unit, and the filter unit comprises an upper shell, a lower shell, a lower shell and an upper sealing cover, the upper shell is composed of an upper end cover and a quincunx six-petal structure; the lower shell consists of a lower end cover and a lower sealing cover with a quincunx six-petal structure; the outer side of the filter element framework is wrapped with filter cloth, and vertical flow channels distributed in an annular array are formed in the filter element framework; the invention belongs to the technical field of filtration and separation, aims to solve the problems of high possibility of scratching filter cloth and low efficiency in the prior art, and achieves the technical effects that through the smooth transition design of a filter element framework consisting of six-petal plum-blossom-shaped grating grooves and an upper / lower sealing cover PVDF (Polyvinylidene Fluoride) port, the mechanical damage of a traditional framework to the filter cloth is thoroughly eliminated, and the filter efficiency is improved. And the back-blowing cake-removing efficiency is remarkably improved by utilizing a three-dimensional supporting structure of the grating groove.

Description

Technical Field

[0001] The present invention relates to the technical field of filtration and separation, and in particular to a corrosion-resistant grid-trough skeleton structure and a filter element containing the structure. Background Art

[0002] In the liquid filtration process in the chemical, pharmaceutical and environmental protection fields, the corrosion-resistant filter element frame is the core component for achieving solid-liquid separation. Traditional filter element frames are mainly divided into two categories: metal frames and plastic frames (such as polypropylene). The existing filtration system has the following defects:

[0003] The sharp edge of the boss at the connection of the skeleton port is easy to scratch the filter cloth, and the efficiency of the grid slot back-blowing cake removal is low, shortening the life of the filter cloth;

[0004] Therefore, the existing demand is not met, and we have proposed a corrosion-resistant grid groove skeleton structure and a filter element containing the structure. Summary of the Invention

[0005] To this end, the present invention provides a corrosion-resistant grid-trough skeleton structure and a filter element containing the structure to solve the above-mentioned problems in the prior art.

[0006] In order to achieve the above object, the present invention provides the following technical solutions:

[0007] According to a first aspect of the present invention, a corrosion-resistant grid trough skeleton structure includes a filter unit, wherein the filter unit includes:

[0008] The upper shell is composed of an upper end cover and an upper cover with a plum blossom-shaped six-petal structure;

[0009] The lower shell is composed of a lower end cover and a lower cover with a plum blossom-shaped six-petal structure;

[0010] At least one filter element frame, the outer side of which is wrapped with filter cloth and the interior of which is provided with vertical flow channels distributed in an annular array; and

[0011] A rigid central converging pipe passing through the upper shell, the filter element frame and the lower shell;

[0012] The filter element frame adopts a six-petal plum blossom-shaped grid slot structure to increase the filter cloth support area and promote backwashing and cake removal;

[0013] A cross-flow space is formed between the lower cover and the bottom filter element frame, which is used to gather the filtrate from all flow channels, buffer pressure fluctuations and eliminate flow resistance;

[0014] The lower end cover is provided with a gathering tank which is connected to the cross-flow space through a connecting hole; the gathering tank receives the filtrate and guides the filtrate to the central converging pipe.

[0015] Furthermore, the cross-flow space is an annular cavity located between the bottom end plane of the lowest filter element skeleton and the bottom plane of the inner cavity at the top of the lower cover.

[0016] Furthermore, the communication hole is opened through the inner cavity of the lower cover and is used to connect the gathering tank and the cross-flow space.

[0017] Furthermore, the filter element skeleton is made of FRPP or PVDF; wherein FRPP is used in a temperature ≤ 80°C and a solvent-free environment, and PVDF is used in a temperature ≤ 150°C or a solvent-containing environment.

[0018] Furthermore, a docking mechanism is provided between the two ends of the filter element frame and the upper cover and the lower cover, including:

[0019] a second internal rib fixedly connected to the inner wall of the flow channel, and a first guide claw mounted on the top end thereof;

[0020] An internal rib plate 1 provided on the top of the inner wall of the upper cover, and a guide claw 2 provided on the bottom of the inner wall of the lower cover;

[0021] The first guide claw and the second guide claw are slidably connected to the first internal rib and the second internal rib of the adjacent components through the guide slots, thereby realizing modular and rapid assembly.

[0022] Furthermore, when multiple filter element frames are connected in series, the second internal rib of the upper frame is docked with the first guide claw of the lower frame.

[0023] Furthermore, a plug-in slot is provided at the bottom of the central converging tube, and plug-in slots are provided on both sides of the bottom of the lower cover, and a U-shaped filter element plug-in is inserted into the inner wall of the plug-in slot; the U-shaped filter element plug cooperates with the plug-in slot and the plug-in slot to limit the circumferential deflection of the central converging tube.

[0024] Furthermore, the top end of the upper cover is fitted with the inner wall of the upper end cover through a guiding cylindrical surface; and the outer side of the bottom end of the lower cover is threadedly connected to the inner wall of the lower end cover.

[0025] Furthermore, during backflushing cleaning, the filter cake is peeled off by using the six-petal plum blossom-shaped grid grooves, and the reverse flow passes through: central converging pipe → converging tank → connecting hole → cross flow space → flow channel.

[0026] A filter element containing a corrosion-resistant grid groove type skeleton structure adopts the corrosion-resistant grid groove type skeleton structure.

[0027] The present invention has the following advantages:

[0028] This corrosion-resistant grid-trough skeleton structure, with its smooth transition design between the filter element skeleton composed of six-petal plum blossom-shaped grid slots and the upper / lower cover PVDF ports, not only completely eliminates mechanical damage to the filter cloth caused by traditional skeletons, but also significantly improves the backwashing and cake removal efficiency by utilizing the three-dimensional support structure of the grid slots. Furthermore, through the synergistic effect of the rigid multi-material central converging pipe and the cross-flow space buffer, the system stability is maintained in high-temperature corrosive environments, allowing multi-stage filtrate to converge without impact. At the same time, the modular combination design significantly expands the adaptability to working conditions and reduces the overall cost of use.

[0029] Figure 1 This is a front view of a corrosion-resistant grid-trough skeleton structure proposed by the present invention;

[0030] Figure 2 for Figure 1 sectional view of

[0031] Figure 3 for Figure 1 Schematic diagram of the decomposition;

[0032] Figure 4 This is a schematic diagram of the decomposition of the multi-stage filter element skeleton;

[0033] Figure 5 This is the main view of the lower end cover;

[0034] Figure 6 This is a bottom view of the lower cover;

[0035] Figure 7 This is the main view of the central converging pipe;

[0036] Figure 8 This is the main view of the upper end cover;

[0037] Figure 9 This is a bottom view of the upper cover;

[0038] Figure 10 It is a top view of the lower cover;

[0039] Figure 11 A schematic diagram of the filtrate flow direction is used for this device.

[0040] In the figure: 1. Upper end cap; 2. Upper sealing cap; 701. Internal rib plate 1; 3. Filter element frame; 301. Flow channel; 604. Converging pipe mounting channel 1; 705. Connecting slot; 706. Plug-in pipe; 702. Guide claw 1; 703. Internal rib plate 2; 4. Lower sealing cap; 401. Flow space; 402. Connecting hole; 704. Guide claw 2; 5. Lower end cap; 501. Converging slot; 6. Central converging pipe; 601. Insert slot; 602. Filter element insert; 603. Insert slot; 605. Converging pipe mounting channel 2; 7. Docking mechanism; 8. Filter cloth DETAILED DESCRIPTION

[0041] The following describes the implementation of the present invention using specific embodiments. Those skilled in the art will readily understand the other advantages and benefits of the present invention from the disclosure herein. Obviously, the embodiments described are only a portion of the present invention, not all of it. All other embodiments derived by persons of ordinary skill in the art based on the embodiments of the present invention without inventive effort are intended to fall within the scope of protection of the present invention.

[0042] Reference Figures 1-11 , a corrosion-resistant grid-trough skeleton structure, including a filter unit;

[0043] The filter unit comprises: an upper shell, a lower shell and a filter element frame 3; the upper shell is composed of an upper end cover 1 and an upper sealing cover 2; the lower shell is composed of a lower sealing cover 4 and a lower end cover 5; the filter unit comprises, from top to bottom: an upper end cover 1, an upper sealing cover 2, a filter element frame 3, a lower sealing cover 4 and a lower end cover 5;

[0044] The filter element skeleton 3 is provided with a vertically penetrating flow channel 301. The flow channels 301 are provided in multiple groups and are distributed in a circular array on the filter element skeleton 3. A filter element is installed on the outside of the filter element skeleton 3, and the inside of the filter element is connected to the flow channel 301. The filtrate is filtered by the filter element and then seeps into the flow channel 301.

[0045] The filter element frame 3 adopts a six-petal plum blossom-shaped grid groove structure design, which provides a larger effective support area and the filtering area of ​​the filter cloth 8, and facilitates the shedding of the filter cake during backflushing. The material of the filter element frame 3 is selected from FRPP (for temperatures ≤ 80°C and solvent-free environments) or PVDF (for temperatures ≤ 150°C or solvent-containing environments) according to the working conditions.

[0046] The bottom end of the inner wall of the lower cover 4 is provided with a communication hole 402 corresponding to the flow channel 301; the inner wall of the lower end cover 5 is provided with an arc-shaped gathering groove 501;

[0047] The upper end cap 1, upper sealing cap 2, lower sealing cap 4, and lower end cap 5 are all made of PVDF (vinylidene fluoride), ensuring corrosion resistance, temperature resistance, and mechanical strength under various working conditions. The upper end cap 1 and lower end cap 5 components are designed as a plum blossom-shaped six-petal structure with a smooth surface transition to avoid damage to the filter cloth 8;

[0048] The upper shell, lower shell, and filter element frame 3 are each provided with a convergence pipe mounting through-hole. Two convergence pipe mounting through-holes are provided. The first convergence pipe mounting through-hole 604 is provided on the filter element frame 3, and the second convergence pipe mounting through-hole 605 is provided on the lower cover 4, upper end cover 1, and upper cover 2. Each convergence pipe mounting through-hole corresponds to another, and the inner walls of each convergence pipe are sleeved on the central convergence pipe 6. The bottom end of the central convergence pipe 6 extends through each convergence pipe mounting through-hole into the convergence tank 501.

[0049] The central converging pipe 6 is made of rigid materials (such as 30408, 316L, 2205, 2507, TA2, Hastelloy, 904L, 20# alloy, PVDF, fiberglass, etc.), which are selected according to different corrosion resistance, temperature resistance and pressure resistance requirements, effectively avoiding the problem of easy bending and deformation of traditional plastic central pipes, and ensuring the stability of system filtration;

[0050] The liquid in the flow channel 301 is transferred to the gathering tank 501 through the communication hole 402 for gathering; and then discharged from the central gathering pipe 6;

[0051] Specifically: the two ends of the filter element skeleton 3 are respectively covered with an upper cover 2 and a lower cover 4; the outer side of the bottom end of the lower cover 4 is threadedly fixed to the inner wall of the lower end cover 5; the top end of the upper cover 2 is covered with the upper end cover 1, and the two ends of the outer wall of the central converging pipe 6 are respectively threadedly fixed to the inner wall of the second converging pipe installation through hole 605 opened on the upper end cover 1 and the lower cover 4;

[0052] Furthermore, a docking mechanism 7 is provided between the two ends of the filter element skeleton 3 and the upper cover 2 and the lower cover 4; the docking mechanism includes: a second internal rib 703 fixedly connected to the middle portion of the inner wall of each flow channel 301; a first guide claw 702 mounted on the top of each second internal rib 703; a first internal rib 701 mounted on the top of the inner wall of the upper cover 2; a second guide claw 704 fixedly connected to the bottom end of the inner wall of the lower cover 4; guide slots provided in the second guide claw 704 and the first guide claw 702 are slidably connected to the outer walls of the first internal rib 701 and the second internal rib 704, respectively;

[0053] The docking mechanism 7 realizes fast and accurate positioning and reliable connection between the filter element frames 3 and between the filter element frames 3 and the upper cover 2 and lower cover 4, facilitating assembly and disassembly and modular combination; at the same time, the modular design concept allows the number of filter element frames 3 to be flexibly increased or decreased according to filtering requirements;

[0054] During installation: first, screw the outer wall of the bottom end of the central converging pipe 6 to the inner wall of the second converging pipe installation through hole 605 on the lower cover 4; sleeve the filter element frame 3 on the top of the central converging pipe 6; insert the second internal rib plate 703 of the filter element frame 3 into the second guide claw 704 installed on the inner wall of the lower cover 4; form a flow space 401 between the bottom of the filter element frame 3 and the bottom end of the inner wall of the lower cover 4; if there are multiple filter element frames 3, connect them end to end in sequence; fit tightly; and connect the first guide claw 702 on the lower filter element frame 3 with the second internal rib plate 703 of the upper filter element frame 3; install the top filter element frame The guide claw 702 at the top of the 3 is connected to the internal rib 701 installed on the inner wall of the upper cover 2 mounted on the top of the 3; the top of the central converging pipe 6 is threadedly fixed to the inner wall of the converging pipe mounting hole 2 605 opened on the upper end cover 1; the top of the upper cover 2 is tightly fitted with the inner wall of the upper end cover 1 through the guide cylindrical surface opened thereon; finally, the lower end cover 5 is threadedly fixed to the lower cover 4; and the assembly is complete. The above installation steps clearly describe the modular assembly process of the entire filter unit, reflecting the detachable and flexible combination of the structural design; the central converging pipe 6 serves as the core support and flow guide component, passing through and connecting various components;

[0055] The cross-flow space 401 is an annular cavity located between the bottom plane of the lowest filter element frame 3 and the bottom plane of the inner cavity of the lower cover 4. When a single filter element frame 3 is installed, the bottoms of all its flow channels 301 are directly connected to the cross-flow space 401. When multiple filter element frames 3 are installed, they are tightly stacked end to end via the docking mechanisms 7 at their ends. The converging pipe installation holes 604 between the multiple filter element frames 3 correspond to each other.

[0056] The core functions of Streaming Space 401 are:

[0057] 1. Multi-channel fluid collection hub: Serves as the final collection area for the filtrate flowing out of the flow channels 301 of all filter element skeletons 3; the filtrate from all filter element skeletons 3 and all flow channels 301 is finally collected in this space;

[0058] Second, pressure buffering and uniform distribution: This space provides a certain volume buffer, collecting filtrate from all channels, helping to mix and homogenize and balance pressure, reducing the impact of instantaneous flow or pressure fluctuations (such as water hammer effect) on the downstream system (collection tank 501, central collection pipe 6), and stabilizing the pressure and flow of the output fluid;

[0059] 3. Ensure effective flow diversion of the connecting hole 402: The existence of the cross-flow space 401 eliminates the flow resistance caused by any microscopic misalignment or assembly gap that may exist between the outlet of the flow channel 301 and the inlet of the connecting hole 402; it provides a barrier-free area for a smooth transition from the channel outlet to the inlet of the connecting hole 402, ensuring to the greatest extent that the filtrate of all channels can pass through the connecting hole 402 smoothly and without obstruction, avoiding the blockage of any connecting hole 402; the problem of liquid being unable to flow out of the connecting hole 402 is solved, thereby improving the overall flow efficiency and reliability.

[0060] 4. "Reservoir" Connecting Multi-Stage Frames: When multiple filter element frames 3 are connected in series, the liquid in the flow channel 301 of the upper filter element frame 3 forms an interface through the plug-in slot 705 at its bottom and the plug-in tube 706 at the top of the lower filter element frame 3. Ultimately, the liquid flows into the flow channel 301 of the lowest frame and then into the cross-flow space 401 at its bottom. The cross-flow space 401 is the "reservoir" that the liquid must pass through before entering the collection tank after multi-stage filtration, ensuring the effective collection of the multi-stage liquid.

[0061] Working principle: The filtrate is filtered through the filter element and then seeps into the flow channel 301. The multiple flow channels 301 are connected to the cross-flow space 401. The filtrate is then transferred to the collection tank 501 through the connecting hole 402 opened below the cross-flow space 401. The filtrate is then discharged from the central collection pipe 6.

[0062] During the backflushing cleaning phase, the airflow or liquid can reversely pass through the central collecting pipe 6 into the collecting tank 501, and then reach the flow channel 301 through the connecting hole 402 and the cross-flow space 401. The six-petal plum blossom grid slot structure provides space and support to effectively peel off the filter cake on the filter cloth 8 (de-cake), completing the filter element cleaning. This structural design makes backflushing more efficient and thorough.

[0063] Furthermore, to prevent the central converging tube 6 from deflecting, a transverse insert slot 603 is provided at the bottom of the central converging tube 6; insert slots 601 are provided on both sides of the bottom end of the lower cover 4; the opening of the U-shaped filter insert 602 is facing upward; its middle part is inserted into the insert slot 603 at the bottom of the central converging tube 6; the top two sides of the U-shaped filter insert 602 are respectively docked with the insert slots 601; thereby circumferentially restricting the central converging tube 6; the cooperation between the filter insert 602, the slot 603, and the slot 601 effectively prevents the central converging tube 6 from rotating or deflecting during operation, thereby ensuring structural stability and sealing reliability;

[0064] Furthermore: a plug-in groove 705 is provided at the bottom of the convergence pipe installation channel 1 604 opened on the filter element skeleton 3; a plug-in tube 706 is fixed to the top; the outer wall of the plug-in tube 706 is slidably connected to the plug-in groove 705 and the inner wall of the convergence pipe installation through hole 2 605; when multiple filter element skeletons 3 are stacked, the plug-in tube 706 of the upper skeleton is inserted into the plug-in groove 705 of the lower skeleton to form auxiliary positioning and guidance, and at the same time strengthen the sealing and structural stability of the central convergence pipe 6 channel at the skeleton connection to prevent filtrate leakage.

Claims

1. A corrosion-resistant grid-trough skeleton structure, comprising a filter unit, characterized in that: The filtering unit comprises: The upper shell is composed of an upper end cover (1) and an upper cover (2) with a plum blossom-shaped six-petal structure; The lower shell is composed of a lower end cover (5) and a lower cover (4) with a plum blossom-shaped six-petal structure; At least one filter element frame (3), the outer side of which is wrapped with filter cloth (8), and the interior of which is provided with vertical flow channels (301) distributed in an annular array; and A rigid central converging pipe (6) passing through the upper shell, the filter element frame (3) and the lower shell; The filter element skeleton (3) adopts a six-petal plum blossom-shaped grid groove structure, which is used to increase the support area of ​​the filter cloth (8) and promote back-blowing to remove cakes; A cross-flow space (401) is formed between the lower cover (4) and the bottom filter core frame (3) for gathering filtrates from all flow channels (301), buffering pressure fluctuations and eliminating flow resistance; The lower end cover (5) is provided with a gathering tank (501) which communicates with the cross-flow space (401) through a connecting hole (402); it receives the filtrate and guides it to the central gathering pipe (6).

2. The corrosion-resistant grid-trough skeleton structure according to claim 1, characterized in that: The cross-flow space (401) is an annular cavity located between the bottom end plane of the lowest filter element skeleton (3) and the bottom plane of the top inner cavity of the lower cover (4).

3. The corrosion-resistant grid-trough skeleton structure according to claim 1, characterized in that: The communication hole (402) is opened through the inner cavity of the lower cover (4) and is used to connect the gathering groove (501) and the cross-flow space (401).

4. The corrosion-resistant grid-trough skeleton structure according to claim 1, characterized in that: The filter element skeleton (3) is made of FRPP or PVDF; FRPP is used in an environment with a temperature of ≤80°C and no solvent, and PVDF is used in an environment with a temperature of ≤150°C or with a solvent.

5. The corrosion-resistant grid-trough skeleton structure according to claim 1, characterized in that: A docking mechanism (7) is provided between the two ends of the filter core frame (3) and the upper cover (2) and the lower cover (4), comprising: A second internal rib (703) fixed to the inner wall of the flow channel, and a first guide claw (702) mounted on the top end thereof; An internal rib plate (701) provided at the top of the inner wall of the upper cover (2), and a guide claw (704) provided at the bottom of the inner wall of the lower cover (4); The guide claw 1 (702) and the guide claw 2 (704) are slidably connected with the internal rib 1 (701) and the internal rib 2 (703) of the adjacent components through the guide slots, thereby realizing modular rapid assembly.

6. The corrosion-resistant grid-trough skeleton structure according to claim 5, characterized in that: When multiple filter element frames (3) are connected in series, the second internal rib (703) of the upper frame is docked with the first guide claw (702) of the lower frame.

7. The corrosion-resistant grid-trough skeleton structure according to claim 6, characterized in that: The bottom of the central converging tube (6) is provided with an insert slot (603), and both sides of the bottom of the lower cover (4) are provided with insert slots (601), and the inner walls of the insert slots (601) are plugged with U-shaped filter inserts (602); the U-shaped filter insert (602) cooperates with the insert slot (603) and the insert slots (601) to limit the circumferential deflection of the central converging tube (6).

8. The corrosion-resistant grid-trough skeleton structure according to claim 7, characterized in that: The top end of the upper cover (2) is fitted with the inner wall of the upper end cover (1) via a guide cylindrical surface; the outer side of the bottom end of the lower cover (4) is threadedly connected to the inner wall of the lower end cover (5).

9. The corrosion-resistant grid-trough skeleton structure according to claim 8, characterized in that: During backflushing cleaning, the filter cake is peeled off by using the six-petal plum blossom-shaped grid grooves, and the reverse flow passes through: the central converging pipe (6) → the converging groove (501) → the connecting hole (402) → the cross-flow space (401) → the flow channel (301).

10. A filter element having a corrosion-resistant grid-trough skeleton structure, characterized in that: A corrosion-resistant grid-trough skeleton structure as described in claims 1 to 9 is adopted.

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