A quick-release coating filter cartridge

Abstract

This utility model discloses a quick-release coating filter element, relating to the field of filter element technology. It includes an inner support tube, an outer support tube, pleated filter media, an upper end cap, and a lower end cap. The outer support tube has an elastic annular wall section with a convex V-shaped cross-section in the middle, integrally formed from a first connecting annular wall, a second connecting annular wall, and a C-shaped connecting wall. The lower end cap includes a cylindrical body, a filter media retaining ring, and a first guide cone section. A silicone sealing ring with a second guide cone section is fitted onto the cylindrical body. A retaining protrusion is provided at the lower end of the outer support tube. During installation, the elastic annular wall section undergoes axial compression deformation, driving the outer support tube to shorten and extend the lower end cap to engage with the mounting groove. During disassembly, the elastic annular wall section releases elastic potential energy to provide axial assistance, which, combined with the guide cone section and retaining protrusion structure, enables quick assembly and disassembly of the filter element with reliable sealing.

Description

Technical Field

[0001] This utility model relates to the field of filter technology, and in particular to a quick-release coating filter element. Background Technology

[0002] In the paint production process, after the grinding step, filtration is required to remove undispersed pigment agglomerates, tiny impurities, and other particles. Externally pressurized pleated filter media cartridges have become the mainstream filter cartridges used in this process due to their high filtration accuracy and strong dirt-holding capacity. As disposable consumables, their core requirement is to achieve absolute sealing during a single use (preventing unfiltered paint from mixing into the clean side) and to efficiently complete installation and disassembly.

[0003] Typical structure of existing pleated filter media filter cartridges is as follows: Figure 1 As shown, the system includes an inner support tube 1 with evenly distributed through holes on its annular wall for the flow of filtered coating material; a filter material 2 folded around the outer circumference of the inner support tube 1; an outer support tube 3 protecting the filter material 2 from external pressure damage; and an upper end cap 4 and a lower end cap 5 fixed to the inner support tube 1 and outer support tube 3 by heat fusion welding, which are integrally non-removable. The upper end cap 4 is a fully enclosed structure (preventing unfiltered coating material from leaking from the top), and the lower end cap 5 has an opening (serving as the sole outlet for the filtered clean coating material). To achieve interface sealing, a vertical ring 5-1 is integrally formed on the lower end face of the lower end cap 5. A circular cross-section sealing ring 5-1.1 is embedded around the outer circumference of the vertical ring 5-1. The vertical ring 5-1 and the mounting groove 6-1 of the security filter 6 are interference-fitted, providing a foundation fixation through radial clamping force. The sealing ring 5-1.1 fills the microscopic gap between the vertical ring 5-1 and the mounting groove 6-1 through elastic deformation, and the two work together to achieve a "zero-gap" seal, ensuring filtration accuracy.

[0004] However, this design, which binds "sealing assistance" and "fixation" to "interference fit," can meet the sealing requirements for a single use, but it affects the "disassembly" process of disposable filter cartridges:

[0005] Firstly, existing pleated filter media rely on the deformation interference fit of the vertical ring 5-1 itself during filter element installation. In order to reduce installation resistance, the industry routinely applies Vaseline to the surface of the vertical ring 5-1 for lubrication. However, the viscous substance formed by the mixture of Vaseline and residual coating will further increase the resistance of the next disassembly, falling into the dilemma of "the more lubricated, the more difficult to disassemble", making disassembly more difficult than installation.

[0006] Secondly, the radial force of the interference fit may cause excessive local compression of the sealing ring 5-1.1, forming "wrinkles". The diameter of the circular cross-section of the sealing ring 5-1.1 is generally too small. During filtration, the wrinkled parts cannot fit tightly with the inner wall of the mounting groove 6-1, which is prone to micro-leakage. Moreover, the circular cross-section of the sealing ring 5-1.1 will also provide certain resistance during installation / removal. Utility Model Content

[0007] To address the aforementioned problems, the purpose of this utility model is to provide a quick-release coating filter cartridge, solving the problem of the difficulty in disassembling folded filter cartridges in the prior art.

[0008] The technical solution of this utility model is as follows:

[0009] A quick-release coating filter cartridge includes an inner support tube and an outer support tube, with folded filter media between the inner and outer support tubes. Upper end caps are connected to the upper parts of both the inner and outer support tubes, and a lower end cap is connected to the lower end face of the inner support tube. An elastic annular wall section with a convex V-shaped cross-section is provided in the middle of the outer annular wall of the outer support tube. The elastic annular wall section includes a first connecting annular wall and a second connecting annular wall connected to the annular wall of the outer support tube. These two sections are integrally formed by a C-shaped connecting wall. The C-shaped arc transition structure makes the deformation path of the first and second connecting annular walls more controllable, avoiding stress concentration that could lead to cracking. Simultaneously, the C-shaped structure can store more elastic potential energy, improving the restoring force during disassembly. The wall thickness of the elastic annular wall section is less than the wall thickness of the outer support tube. Controllable elastic deformation is achieved through localized stiffness weakening, reducing installation / disassembly forces and preventing overall deformation of the outer support tube, ensuring the structural stability and functional reliability of the filter cartridge during use.

[0010] In the uninstalled state, the elastic ring wall section is in a naturally unfolded state, and the lower end cap is located inside the outer support tube. In the installed state, the elastic ring wall section undergoes elastic deformation under axial compression, while storing elastic potential energy. The angle between the first connecting ring wall and the second connecting ring wall decreases, driving the height of the outer support tube to decrease axially until the lower end cap is located at the bottom of the outer support tube, and the length of the lower end cap extending out of the outer support tube matches the mounting groove. In the disassembled state, the elastic ring wall section releases elastic potential energy, the angle between the first connecting ring wall and the second connecting ring wall increases, and the height of the outer support tube increases axially until the lower end cap returns to the inside of the outer support tube. The elastic potential energy released by the elastic ring wall section is converted into axial assistance, offsetting part of the disassembly resistance of the interference fit, reducing manual force during filter element disassembly.

[0011] Furthermore, the lower end cap includes a cylindrical body, the upper end of which is coaxially and fixedly connected to the inner support tube. A filter media retaining ring is provided on the outer periphery of the cylindrical body, and the lower end face of the filter media abuts against the upper end face of the filter media retaining ring. In the installed state, the filter media retaining ring is located at the lower port of the outer support tube. The lower section of the cylindrical body is provided with a radially inwardly inclined transition slope, forming a first guide cone section. The setting of the first guide cone section allows for quick correction of the coaxiality between the lower end cap and the mounting groove during filter element installation, and at the same time improves the problem that the vertical ring of the existing filter element is prone to jamming when slightly tilted during installation / disassembly.

[0012] Furthermore, the outer ring wall of the cylinder is provided with an annular mounting groove, which is located between the filter material retaining ring and the guide cone section. A silicone sealing ring is interference-fitted into the mounting groove. The silicone sealing ring has a radially inwardly inclined transition slope near the lower section of the guide cone section, forming a second guide cone section. The second guide cone section continues the guiding function of the first guide cone section, so that the silicone sealing ring can be smoothly embedded into the mounting groove.

[0013] Furthermore, the first connecting ring wall and the second connecting ring wall are symmetrically distributed vertically. The C-shaped connecting wall is located at the end of the first connecting ring wall and the second connecting ring wall away from the outer support tube. The outer periphery of the C-shaped connecting wall is provided with a deformation-guiding annular blind groove. The annular blind groove can guide the deformation direction of the C-shaped connecting wall in a directional manner to avoid irregular twisting. At the same time, it can stably store and release elastic potential energy to ensure the smoothness of the quick-release process.

[0014] Furthermore, on the outer ring wall of the outer support tube near the lower end cap, four stop protrusions are spaced circumferentially. The inner end face of the security filter is provided with an L-shaped locking platform that mates with the stop protrusions. The vertical section of the L-shaped locking platform is connected to the inner end face, and the horizontal section is away from the inner end face and connected to the vertical section. There is an installation gap between the horizontal section and the inner section. The lower end face of the stop protrusion is flush with the lower end face of the outer support tube. During installation, the stop protrusion first abuts against the inner end face of the security filter to prevent the filter element from shaking and facilitate axial force application. After the lower end cap is pressed into the mounting groove, the filter element is rotated to drive the stop protrusion into the installation gap in the L-shaped locking platform to complete the fixing of the filter element.

[0015] The beneficial effects of this utility model are as follows:

[0016] 1. In this utility model, the elastic ring wall section of the outer support tube is compressed and stored during installation, and the potential energy is released during disassembly and converted into axial assistance, which offsets part of the interference fit resistance and reduces the force required for manual disassembly.

[0017] 2. The first guide cone section of the lower end cap and the second guide cone section of the silicone sealing ring of this utility model form a continuous guide structure, which can quickly correct the coaxiality and avoid jamming during installation / disassembly.

[0018] 3. The wall thickness of the elastic ring wall section of this utility model is less than that of the outer support tube. Combined with the C-shaped connecting wall and the deformation-guided annular blind groove, local controllable elastic deformation is achieved, avoiding overall deformation of the outer support tube. At the same time, the C-shaped structure reduces stress concentration and ensures the reliability of disassembly and assembly. Attached Figure Description

[0019] Figure 1 This is a schematic diagram of the structure of a filter element in the existing technology.

[0020] Figure 2 This is a schematic diagram of the structure of this utility model.

[0021] Figure 3 This is a structural diagram of the present invention in its installed state.

[0022] Figure 4 This is a disassembly diagram of the present invention.

[0023] Figure 5 This is a schematic diagram of the installation of the present invention and the security filter.

[0024] Figure 6 This utility model Figure 5 A magnified structural diagram at point A.

[0025] Reference numerals in the attached drawings: 1. Inner support tube; 2. Filter media; 3. Outer support tube; 3-1. Elastic ring wall section; 3-1.1. First connecting ring wall; 3-1.2. Second connecting ring wall; 3-1.3. C-shaped connecting wall; 3-2. Stopping protrusion; 4. Upper end cap; 5. Lower end cap; 5-1. Vertical ring body; 5-1.1. Sealing ring; 5-1.2. Filter media stop ring; 5-1.3. First guide cone section; 5-1.4. Silicone sealing ring; 6. Security filter; 6-1. Mounting groove; 6-2. L-shaped mounting platform. Detailed Implementation

[0026] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments of the present utility model. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments.

[0027] like Figures 1 to 6 As shown, a quick-release coating filter cartridge includes an inner support tube 1 and an outer support tube 3. A folded filter material 2 is provided between the inner support tube 1 and the outer support tube 3. An upper end cap 4 is connected to the upper part of the inner support tube 1 and the outer support tube 3, and a lower end cap 5 is connected to the lower end face of the inner support tube 1. An elastic annular wall section 3-1 is provided in the middle of the outer annular wall of the outer support tube 3. The elastic annular wall section 3-1 has an outwardly convex V-shaped cross-section. The elastic annular wall section 3-1 includes a first connecting annular wall 3-1.1 and a second connecting annular wall 3-1.2 connected to the annular wall of the outer support tube 3, and the two are connected by a C-shaped... The connecting wall 3-1.3 is integrally formed, and the C-shaped arc transition structure makes the deformation path of the first connecting ring wall 3-1.1 and the second connecting ring wall 3-1.2 more controllable, avoiding stress concentration that could lead to cracking. At the same time, the C-shaped structure can store more elastic potential energy, improving the restoring force during disassembly. The wall thickness of the elastic ring wall section 3-1 is less than the wall thickness of the outer support tube 3. Controllable elastic deformation is achieved through local stiffness weakening, which reduces the installation / disassembly operation force and avoids overall deformation of the outer support tube 3, ensuring the structural stability and functional reliability of the filter element during use.

[0028] In the uninstalled state, the elastic ring wall section 3-1 is in a naturally unfolded state, and the lower end cap 5 is located inside the outer support tube 3. In the installed state, the elastic ring wall section 3-1 undergoes elastic deformation under axial compression, while storing elastic potential energy. The angle between the first connecting ring wall 3-1.1 and the second connecting ring wall 3-1.2 decreases, driving the height of the outer support tube 3 to decrease axially until the lower end cap 5 is located at the lower part of the outer support tube 3. The length of the lower end cap 5 extending out of the outer support tube 3 is adapted to the mounting groove 6-1. In the disassembled state, the elastic ring wall section 3-1 releases elastic potential energy, the angle between the first connecting ring wall 3-1.1 and the second connecting ring wall 3-1.2 increases, and the height of the outer support tube 3 increases axially until the lower end cap 5 returns to the interior of the outer support tube 3. The elastic potential energy released by the elastic ring wall section 3-1 is converted into axial assistance, offsetting part of the disassembly resistance of the interference fit, and reducing manual force during filter element disassembly.

[0029] Furthermore, the lower end cap 5 includes a cylindrical body, the upper end of which is coaxially and fixedly connected to the inner support tube 1. A filter media retaining ring 5-1.2 is provided on the outer periphery of the cylindrical body. The lower end face of the filter media 2 abuts against the upper end face of the filter media retaining ring 5-1.2. In the installed state, the filter media retaining ring 5-1.2 is located at the lower end of the outer support tube 3. The lower section of the cylindrical body is provided with a radially inwardly inclined transition slope, forming a first guide cone section 5-1.3. The setting of the first guide cone section 5-1.3 can quickly correct the coaxiality of the lower end cap 5 and the mounting groove 6-1 during filter element installation, and at the same time improve the problem that the vertical ring 5-1 of the existing filter element is prone to jamming when slightly tilted during installation / disassembly.

[0030] Furthermore, an annular mounting groove is provided on the outer ring wall of the cylinder. The mounting groove is located between the filter media retaining ring 5-1.2 and the guide cone section. A silicone sealing ring 5-1.4 is interference-fitted into the mounting groove. The lower section of the silicone sealing ring 5-1.4 near the guide cone section has a radially inwardly inclined transition slope, forming a second guide cone section. The second guide cone section continues the guiding function of the first guide cone section 5-1.3, so that the silicone sealing ring 5-1.4 can be smoothly embedded into the mounting groove 6-1.

[0031] Furthermore, the first connecting ring wall 3-1.1 and the second connecting ring wall 3-1.2 are symmetrically distributed vertically. The C-shaped connecting wall 3-1.3 is located at the end of the first connecting ring wall 3-1.1 and the second connecting ring wall 3-1.2 away from the outer support tube 3. The outer periphery of the C-shaped connecting wall 3-1.3 is provided with a deformation-guiding annular blind groove. The annular blind groove can guide the deformation direction of the C-shaped connecting wall 3-1.3 in a directional manner to avoid irregular twisting. At the same time, it can stably store and release elastic potential energy to ensure the smoothness of the quick-release process.

[0032] Furthermore, on the outer ring wall of the outer support tube 3 near the lower end cap 5, four stop protrusions 3-2 are provided circumferentially. The inner end face of the security filter 6 is provided with an L-shaped locking platform 6-2 that cooperates with the stop protrusions 3-2. The vertical section of the L-shaped locking platform 6-2 is connected to the inner end face, and the horizontal section is away from the inner end face and connected to the vertical section. There is an installation gap between the horizontal section and the inner section. The lower end face of the stop protrusion 3-2 is flush with the lower end face of the outer support tube 3. During installation, the stop protrusion 3-2 first abuts against the inner end face of the security filter 6 to prevent the filter element from shaking and facilitate axial force application. After the lower end cap 5 is pressed into the mounting groove 6-1, the filter element is rotated to drive the stop protrusion 3-2 into the installation gap in the L-shaped locking platform 6-2 to complete the fixing of the filter element.

[0033] The above description is only a preferred embodiment of the present utility model, but the protection scope of the present utility model is not limited thereto. Any equivalent substitutions or changes made by those skilled in the art within the technical scope disclosed in the present utility model, based on the technical solution and the inventive concept of the present utility model, should be included within the protection scope of the present utility model.

Claims

1. A quick-release coating filter cartridge, comprising an inner support tube and an outer support tube, wherein a folded filter material is disposed between the inner support tube and the outer support tube, and an upper end cap is connected to the upper part of the inner support tube and the outer support tube, characterized in that, The lower end face of the inner support tube is connected to a lower end cap, and the outer support tube has an elastic ring wall section in the middle of its outer ring wall. The elastic ring wall section has an outwardly convex V-shaped cross section. The elastic ring wall segment includes a first connecting ring wall and a second connecting ring wall that are connected to the outer support tube ring wall, and the two are integrally formed by a C-shaped connecting wall. When not installed, the elastic ring wall section is in a naturally extended state, and the lower end cap is located inside the outer support tube; In the installed state, the elastic ring wall section undergoes elastic deformation under axial compression, the angle between the first connecting ring wall and the second connecting ring wall decreases, and the height of the outer support tube is driven to decrease axially until the lower end cap is located at the lower part of the outer support tube.

2. The quick-release coating filter element according to claim 1, characterized in that, The lower end cap includes a cylinder, the upper end of which is coaxially and fixedly connected to the inner support tube. A filter media stop ring is provided on the outer periphery of the cylinder. The lower end face of the filter media abuts against the upper end face of the filter media stop ring. In the installed state, the filter media stop ring is located at the lower end of the outer support tube. The lower section of the cylinder is provided with a radially inwardly inclined transition slope, forming a first guide cone section.

3. The quick-release coating filter element according to claim 2, characterized in that, The outer ring wall of the cylinder is provided with an annular mounting groove, which is located between the filter material stop ring and the guide cone section. A silicone sealing ring is interference-fitted into the mounting groove. The silicone sealing ring has a radially inwardly inclined transition slope near the lower section of the guide cone section, forming a second guide cone section.

4. The quick-release coating filter element according to claim 1, characterized in that, The wall thickness of the elastic ring wall section is less than the wall thickness of the outer support tube.

5. A quick-release coating filter element according to claim 1, characterized in that, The first connecting ring wall and the second connecting ring wall are symmetrically distributed vertically, and the C-shaped connecting wall is located at the end of the first connecting ring wall and the second connecting ring wall away from the outer support tube.

6. A quick-release coating filter element according to claim 5, characterized in that, The outer periphery of the C-shaped connecting wall is provided with a deformation-guided annular blind groove.

7. A quick-release coating filter element according to claim 1, characterized in that, At least two stop protrusions are provided circumferentially on the outer ring wall of the outer support tube near the lower end cap, and the lower end face of the stop protrusions is flush with the lower end face of the outer support tube.

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