Oil-resistant foaming end cover type filter element and foaming mold thereof

Abstract

The utility model discloses an oil-resistant foaming end cover type filter element which comprises a barrel-shaped filter layer, the barrel-shaped filter layer is provided with a central hole, two axial ends of the barrel-shaped filter layer are respectively connected with an upper end cover and a lower end cover, the upper end cover and the lower end cover are foaming rubber sheets, an upper rubber sheet gasket is embedded in the center of the upper surface of the upper end cover, and a lower rubber sheet gasket is embedded in the center of the lower surface of the barrel-shaped filter layer. A lower film gasket is embedded in the center of the lower surface of the lower end cover. The utility model further provides a corresponding foaming mold which comprises a middle lower mold part and a top mold part and is used for producing the oil-resistant foaming end cover type filter element. The film gasket can reduce the internal stress of the film caused by temperature change, reduce the probability of cracking of the end cover due to material shrinkage in the cooling process after heating, improve the yield in the manufacturing process, and provide important support for light weight of the filter element. The foaming mold is simple in structure, and the middle lower mold part and the top mold part are divided, so that combination and disassembly are convenient, and foaming production is facilitated.

Description

Technical Field

[0001] The utility model relates to the technical field of filter elements, in particular to a lightweight and environmentally friendly filter element and a manufacturing technology thereof. Background Art

[0002] Filter elements are typically used to separate solid particles from liquids or gases to ensure proper operation of equipment. They can restore contaminated liquids (such as oil) to a cleanliness level sufficient for production or daily life. Filter elements are typically installed in a filter housing that isolates the fluid from the outside world. When the filter element is in operation, the fluid in the pathway first enters the filter housing, then seeps through the dirty side of the filter element before being discharged through the clean side, thus filtering the fluid.

[0003] Currently, the most widely used filter elements are cylindrical filter elements with end caps. These elements consist of a cylindrical filter layer (using a pleated paper core) with upper and lower end caps bonded to the top and bottom of the cylindrical filter layer, respectively. In existing technology, most end caps are stamped from galvanized steel sheet and then bonded to the paper core after applying glue. The sealing performance of the bond between the paper core and the end caps directly affects the filter's technical performance.

[0004] Galvanized steel sheet as filter element end cover has the following defects:

[0005] 1. Not environmentally friendly. Galvanized steel is coated with a layer of zinc, which gradually oxidizes and corrodes in the natural environment, especially in acidic or humid environments. This releases zinc ions into the soil or water, causing heavy metal pollution. Zinc reacts with oxygen and moisture in the environment to form zinc oxide, which releases acidic substances in the process, causing a certain degree of soil acidification. Furthermore, the production process of galvanized steel can also cause significant pollution.

[0006] 2. The heavy weight is inconsistent with the industry's technological development trend toward lightweighting. For automotive parts, lightweighting (weight reduction) has the following benefits: ① It improves fuel efficiency, contributing to the achievement of fuel conservation and vehicle emissions targets. ② It reduces material costs. ③ It improves vehicle performance (such as acceleration, braking, and handling). ④ It helps the vehicle meet relevant regulations, which set specific requirements for vehicle emissions and energy efficiency.

[0007] Therefore, it is necessary to design a lightweight filter element end cap. The applicant's technical route is the foaming route. When implementing the foaming route to produce the filter element end cap, the following specific design goals were derived:

[0008] 1. Design related foaming molds.

[0009] 2. Foaming requires a heating and cooling process. During this process, the material expands and contracts. Temperature fluctuations cause internal stress changes within the material, which can cause cracks in the end cap. Cracks in the end cap result in defective products, so technologies must be designed to address these cracking issues and improve yield rates. Utility Model Content

[0010] The purpose of the utility model is to provide an oil-resistant foamed end-cap type filter element, which not only achieves the purpose of lightweighting by adopting a foamed filter element end cap, but also greatly reduces the probability of cracks appearing on the filter element end cap during cooling and shrinkage during the manufacturing process.

[0011] To achieve the above-mentioned purpose, the utility model provides an oil-resistant foam end-cap filter element, which includes a cylindrical filter layer having a center hole. The cylindrical filter layer is respectively connected to an upper end cap and a lower end cap at both axial ends. The upper end cap and the lower end cap are both foam rubber sheets. An upper rubber gasket is embedded in the center of the upper surface of the upper end cap, and a lower rubber gasket is embedded in the center of the lower surface of the lower end cap.

[0012] The utility model also discloses a corresponding foaming mold for producing the oil-resistant foaming end-cap filter element, comprising a middle and lower mold part and a top mold part;

[0013] The middle and lower mold parts include a chassis, the upper surface of which is provided with a lower annular groove for preparing the lower end cover, and a central column connected upwardly from the middle of the chassis, which matches the central hole of the cylindrical filter layer; the top surface of the central column is upwardly protruding with a block, and the top surface of the central column outside the block forms a step for supporting the top mold part;

[0014] The top mold piece includes a top plate, the lower surface of which is provided with an upper annular groove for preparing the upper end cover, the center of the top plate is provided with a clamping hole adapted to the clamping block, and the top plate radially inside the upper annular groove is supported on the step.

[0015] The utility model has the following advantages:

[0016] Film gaskets can reduce the stress inside the film caused by temperature changes, reduce the probability of cracks in the end cover due to material shrinkage during the cooling process after heating, improve the yield rate in the manufacturing process, and provide important support for lightweight filter elements.

[0017] The foaming mold has a simple structure and is divided into two parts: the middle and lower mold parts and the top mold parts, which is convenient for assembly and disassembly and convenient for the placement of film gaskets and foaming materials. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] Figure 1 The utility model is a structural schematic diagram of an oil-resistant foam end-cap type filter element.

[0019] Figure 2It is a schematic diagram of the cross-sectional structure of the foaming mold.

[0020] Figure 3 It is a schematic diagram of the three-dimensional structure of the foaming mold. DETAILED DESCRIPTION

[0021] like Figures 1 to 3 As shown, the utility model is an oil-resistant foam end-cap filter element including a cylindrical filter layer 1, the cylindrical filter layer 1 having a central hole 2, the cylindrical filter layer 1 is connected to an upper end cover 3 and a lower end cover 4 at both axial ends, the upper end cover 3 and the lower end cover 4 are both foam rubber sheets, an upper rubber gasket 5 is embedded in the center of the upper surface of the upper end cover 3, and a lower rubber gasket 6 is embedded in the center of the lower surface of the lower end cover 4.

[0022] Film gaskets can reduce the stress inside the film caused by temperature changes, reduce the probability of cracks in the end cover due to material shrinkage during the cooling process after heating, improve the yield rate in the manufacturing process, and provide important support for lightweight filter elements.

[0023] like Figure 2 and Figure 3 As shown, the present invention also provides a foaming mold for the above-mentioned oil-resistant foaming end-cap type filter element, comprising a middle and lower mold piece and a top mold piece;

[0024] The middle and lower mold parts include a chassis 7, the upper surface of which is provided with a lower annular groove 8 for preparing the lower end cover 4. A central column 9 is connected upwardly to the middle of the chassis 7, and the central column 9 matches the central hole 2 of the cylindrical filter layer 1. The top surface of the central column 9 is provided with a block 10 protruding upward, and the top surface of the central column 9 outside the block 10 forms a step 11 for supporting the top mold part.

[0025] The top mold part includes a top plate 12, and the lower surface of the top plate 12 is provided with an upper annular groove 13 for preparing the upper end cover 3. The center of the top plate 12 has a card hole 14 adapted to the card block 10. The top plate 12 radially inside the upper annular groove 13 is supported on the step 11.

[0026] The foaming mold has a simple structure and is divided into two parts: the middle and lower mold parts and the top mold parts, which are convenient for assembly and disassembly, and convenient for the placement of the film gasket and foaming material. The foaming mold is made of metal material, preferably aluminum.

[0027] When producing an oil-resistant foam end-cap filter element of the present invention, a layer of mold release agent is first sprayed in the lower annular groove 8 on the chassis 7 of the middle and lower mold parts, the lower rubber gasket 6 and the foaming material for preparing the lower end cap 4 are placed, and then the cylindrical filter layer 1 is put on the central column 9.

[0028] A layer of mold release agent is then sprayed into the upper annular groove 13 on the top plate 12 of the inverted top mold. The upper rubber gasket 5 and foaming material for the upper end cap 3 are then placed. Finally, the cylindrical filter layer 1 and the middle and lower molds are inverted, with the clamping block 10 inserted downwardly into the clamping hole 14 on the top plate 12 of the top mold, completing the mold and material preparation before heating. The top plate 12 and bottom plate 7 of the foaming mold are heated for 1-2 minutes, at a temperature tailored to the specific foaming material. Through vulcanization and foaming, the foaming material forms the upper and lower end caps 3 and 4, which naturally adhere to the filter layer. After cooling and demolding, the oil-resistant foamed end cap filter element of the present invention is obtained.

[0029] The foaming material is preferably made by blending oil-resistant rubber, vulcanizing agent, foaming agent, antioxidant, reinforcing agent and softening oil, and has good oil resistance after foaming.

[0030] The above embodiments are only used to illustrate rather than limit the technical solutions of the present invention. Although the present invention has been described in detail with reference to the above embodiments, those skilled in the art should understand that the present invention can still be modified or replaced by equivalents. Any modification or partial replacement that does not depart from the spirit and scope of the present invention should be included in the scope of the claims of the present invention.

Claims

1. An oil-resistant foam end-cap filter element, comprising a cylindrical filter layer having a central hole, an upper end cap and a lower end cap connected to the axial ends of the cylindrical filter layer, characterized in that: The upper end cover and the lower end cover are both foamed rubber sheets. An upper rubber sheet gasket is embedded at the center of the upper surface of the upper end cover, and a lower rubber sheet gasket is embedded at the center of the lower surface of the lower end cover.

2. A foaming mold for producing an oil-resistant foamed end-cap filter element as claimed in claim 1, characterized in that: It includes middle and lower mold parts and top mold parts; The middle and lower mold parts include a chassis, the upper surface of which is provided with a lower annular groove for preparing the lower end cover, and a central column connected upwardly from the middle of the chassis, which matches the central hole of the cylindrical filter layer; the top surface of the central column is upwardly protruding with a block, and the top surface of the central column outside the block forms a step for supporting the top mold part; The top mold piece includes a top plate, the lower surface of which is provided with an upper annular groove for preparing the upper end cover, the center of the top plate is provided with a clamping hole adapted to the clamping block, and the top plate radially inside the upper annular groove is supported on the step.

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