Filter end cover and forming die thereof

Abstract

The utility model discloses a filter end cover and forming die thereof belongs to air filter production technical field. The filter end cover includes the end cover body that is equipped with the through hole in the center, and the end cover body includes the soft glue sealing part and hard glue connecting part of integrative injection moulding, is provided with annular sealing convexo-concave on the soft glue sealing part. The forming die of the filter end cover includes mould main part and soft glue positioning ring, and is set up with the annular injection cavity that matches with the filter end cover outside contour on the mould main part, and the soft glue positioning ring is detachably installed in the annular injection cavity, and the soft glue positioning ring forms with the bottom wall and the lateral wall of annular injection cavity and matches with the soft glue injection moulding cavity of soft glue sealing part. The filter end cover of the utility model can guarantee the sealing performance, and has good support reinforcing effect, and product performance is good. The filter end cover can effectively reduce production procedure, be favorable to improving production efficiency and ensure the sealing performance and connecting strength of end cover to adopt this forming die production.

Description

Technical Field

[0001] This utility model relates to the field of air filter manufacturing technology, specifically to a filter end cap and its molding die. Background Technology

[0002] Air filters are primarily used to filter the air entering engines or mechanical equipment, blocking dust, sand, and other impurities from entering cylinders or precision components and causing wear on critical parts. Therefore, they are widely used in the automotive and industrial machinery industries. To ensure filtration effectiveness, air filters have extremely stringent requirements for the sealing performance of their seals. The quality and manufacturing process of the seals significantly impact product performance. Currently, existing metal-cap filter elements typically achieve sealing by bonding a sealing ring to the metal cap. The process involves first wiping the metal cap to remove dust, using thinner to remove oil stains, and then using quick-drying glue or all-purpose glue to bond the sealing ring to the metal cap. This bonding method is prone to problems where some seals are not firmly bonded, leading to detachment and severely affecting the product's lifespan and quality. Some products use soft PU foam sealing caps. The filter element is inserted into the soft PU foam while the end cap is being foamed. However, the inner and outer dimensions of the soft PU sealing cap are prone to shrinkage after molding, which affects the installation of subsequent products. Therefore, the molding process needs to be strictly controlled during the production process, and the requirements for the mold are very high, which greatly reduces the production efficiency and results in a low product qualification rate. Utility Model Content

[0003] In order to overcome the shortcomings of the prior art, the purpose of this utility model is to provide a filter end cap. The filter end cap is integrally injection molded by combining soft and hard PU adhesives, which can not only ensure sealing performance, but also have a good supporting and reinforcing effect. It effectively avoids the problem of easy shrinkage of the inner and outer dimensions of the soft PU foam end caps in the prior art. The product has good performance and is conducive to improving production efficiency.

[0004] To solve the above problems, the technical solution adopted by this utility model is as follows: A filter end cap includes an end cap body with a through hole at the center, the end cap body including a soft rubber sealing part and a hard rubber connecting part, the soft rubber sealing part and the hard rubber connecting part being integrally injection molded; the soft rubber sealing part is provided with an annular sealing protrusion.

[0005] In a preferred embodiment of this utility model, the connection surface between the side of the annular sealing protrusion away from the through hole and the plane of the soft rubber sealing part is an inclined transition surface.

[0006] In a preferred embodiment of this utility model, the connection surface between the soft rubber sealing part and the hard rubber connecting part is stepped.

[0007] In a preferred embodiment of the present invention, the connection surface between the soft rubber sealing part and the hard rubber connecting part includes a first horizontal connection surface, a first vertical connection surface, a second horizontal connection surface, and a second vertical connection surface connected sequentially from the inside out.

[0008] In a preferred embodiment of this utility model, the first horizontal connecting surface and the second horizontal connecting surface are wavy.

[0009] In a preferred embodiment of this utility model, the inner wall of the soft rubber sealing part is zigzag-shaped.

[0010] This utility model also provides a molding die for a filter end cap. The molding die is used to produce the filter end cap as described above. It includes a mold body and a soft rubber positioning ring. The mold body has an annular injection cavity that matches the outer contour of the filter end cap. The soft rubber positioning ring is detachably installed in the annular injection cavity, and a soft rubber injection molding cavity that matches the soft rubber sealing part is formed between the soft rubber positioning ring and the bottom wall and side wall of the annular injection cavity.

[0011] In a preferred embodiment of the present invention, an annular groove matching the annular sealing protrusion is provided on the bottom wall of the annular injection cavity.

[0012] In a preferred embodiment of this utility model, the outer diameter of the soft rubber positioning ring is equal to the outer diameter of the annular injection cavity; the inner diameter of the soft rubber positioning ring is smaller than the inner diameter of the annular injection cavity, and an injection hole is formed between the inner side of the soft rubber positioning ring and the inner side of the annular injection cavity.

[0013] In a preferred embodiment of the present invention, the bottom wall of the soft rubber positioning ring is provided with a clearance step for forming a soft rubber injection molding cavity.

[0014] Compared with the prior art, the beneficial effects of this utility model are as follows: The filter end cap of this utility model is integrally injection molded using soft and hard PU rubber. On the one hand, the soft rubber sealing part molded by the soft PU rubber improves the sealing performance of the filter end cap. On the other hand, the hard rubber connecting part molded by the hard PU rubber enhances the support and strengthening effect of the filter end cap. This effectively avoids the product installation being affected by the shrinkage of the inner and outer dimensions after the end cap is formed, and solves the problems of multiple bonding processes, weak bonding and easy detachment in the existing sealing ring bonding methods.

[0015] The filter end cap molding die provided by this utility model has a simple structure. The soft rubber injection molding cavity of the soft rubber sealing part is formed by the cooperation of the soft rubber positioning ring and the mold body. After the soft rubber sealing part is injected, the soft rubber positioning ring is removed and then PU hard rubber is injected into the annular injection cavity. After the injection is completed, the filter element is inserted into the PU hard rubber. After the PU hard rubber solidifies and is molded, the end cap and the filter element are demolded, thus completing the connection. Using this molding die to produce filter end caps can effectively reduce production steps, improve production efficiency, and ensure the sealing performance and connection strength of the end cap, thereby improving the quality of filter products. Attached Figure Description

[0016] Figure 1 This is a cross-sectional view of the filter end cap of the present invention; Figure 2 This utility model Figure 1 A magnified view of part A; Figure 3 This is a cross-sectional view of the molding die for the filter end cap of this utility model; Figure 4 This is a schematic diagram of the injection molding process of the filter end cap of the present invention; Figure 5 This is a schematic diagram of a filter structure containing the filter end cap of this utility model.

[0017] Explanation of reference numerals in the attached diagram: 1. End cap body; 2. Soft rubber sealing part; 21. Annular sealing protrusion; 22. Inclined transition surface; 3. Hard rubber connecting part; 4. First horizontal connecting surface; 5. First vertical connecting surface; 6. Second horizontal connecting surface; 7. Second vertical connecting surface; 8. Mold body; 81. Center hole; 82. Annular injection cavity; 83. Annular groove; 9. Soft rubber positioning ring; 91. Avoidance step; 10. Soft rubber injection molding cavity. Detailed Implementation

[0018] The present invention will now be described in further detail with reference to the accompanying drawings and specific embodiments.

[0019] like Figure 1As shown, the filter end cap provided by this utility model includes an end cap body 1 with a through hole in the center. The end cap body 1 includes a soft rubber sealing part 2 and a hard rubber connecting part 3, which are integrally injection molded. The soft rubber sealing part 2 is provided with an annular sealing protrusion 21. The elastic properties of the soft rubber sealing part 2 can further improve the sealing performance of the filter end cap. The hard rubber connecting part 3 is used to connect with the filter media assembly. The use of hard rubber injection molding can effectively avoid the product installation being affected by the shrinkage of the inner and outer dimensions after the soft rubber injection molded end cap is formed. It can be seen that the filter end cap of this utility model, by combining soft and hard PU rubber and integrally injection molding, can not only ensure sealing performance, but also have a good supporting and reinforcing effect. It effectively avoids the problem of easy shrinkage of the inner and outer dimensions of the soft PU rubber foam end cap in the prior art. The product has good performance and is conducive to improving production efficiency.

[0020] Furthermore, such as Figure 2 As shown, the connection surface between the soft rubber sealing part 2 and the hard rubber connecting part 3 is stepped. This stepped connection surface improves the connection strength between the soft rubber sealing part 2 and the hard rubber connecting part 3, thereby enhancing the structural strength of the filter end cap. Specifically, the connection surface between the soft rubber sealing part 2 and the hard rubber connecting part 3 includes a first horizontal connecting surface 4, a first vertical connecting surface 5, a second horizontal connecting surface 6, and a second vertical connecting surface 7 connected sequentially from the inside out. This continuous stepped connection surface makes the connection between the soft rubber sealing part 2 and the hard rubber connecting part 3 more secure. In some embodiments, to further enhance the connection strength, the first horizontal connecting surface 4 and the second horizontal connecting surface 6 are wavy, increasing the contact area between the soft rubber sealing part 2 and the hard rubber connecting part 3 to enhance the connection strength.

[0021] In some embodiments, the connection surface between the side of the annular sealing protrusion 21 away from the through hole and the plane of the soft rubber seal 2 is an inclined transition surface 22. The inclined transition surface 22 can serve as a buffer and height compensation, and also enhance the connection strength between the annular sealing protrusion 21 and the soft rubber seal 2. In some embodiments, the inner diameter of the soft rubber seal 2 gradually increases along the airflow direction to facilitate filter installation. More preferably, the inner sidewall of the soft rubber seal 2 is zigzag-shaped, allowing the inner sidewall of the soft rubber seal 2 to transition naturally, thereby improving the convenience of filter installation.

[0022] like Figure 3As shown, this utility model also provides a molding die for producing the filter end cap as described above. The molding die includes a die body 8 and a soft rubber positioning ring 9. Specifically, a central hole 81 for reducing die weight is provided at the center of the die body 8. An annular injection cavity 82 matching the outer contour of the filter end cap is formed on the die body 8, located outside the central hole 81. The soft rubber positioning ring 9 is detachably installed inside the annular injection cavity 82, and a soft rubber injection molding cavity 10 matching the soft rubber sealing part 2 is formed between the soft rubber positioning ring 9 and the bottom and side walls of the annular injection cavity 82. Figure 4 As shown, the actual usage process of this molding die is as follows: First, install the soft rubber positioning ring 9 in the annular injection cavity 82, ensuring that the soft rubber positioning ring 9 is placed stably so that a soft rubber injection molding cavity 10 is formed between the soft rubber positioning ring 9 and the mold body 8. Then, inject PU soft rubber into the soft rubber injection molding cavity 10. After the PU soft rubber foams and forms, remove the soft rubber positioning ring 9 from the mold body 8. Inject PU hard rubber into the annular injection cavity 82. Before the PU hard rubber foams and forms, insert the prepared filter material assembly into the PU hard rubber. After the PU hard rubber foams and forms, remove the formed filter element semi-finished product from the mold body 8, and then install the lower cover (iron cover or PU cover) on the other end of the filter element semi-finished product, thus obtaining the desired result. Figure 5 The complete filter element is shown. It is evident that using this molding die to produce filter end caps can effectively reduce production steps, improve production efficiency, and ensure the sealing performance and connection strength of the end caps, thereby improving the quality of the filter products.

[0023] Specifically, an annular groove 83 matching the annular sealing protrusion 21 is formed on the bottom wall of the annular injection cavity 82. This annular groove 83 communicates with the soft rubber injection molding cavity 10 and is used for the forming of the annular sealing protrusion 21 during soft rubber injection molding. The soft rubber positioning ring 9 has an annular structure. In some embodiments, the outer diameter of the soft rubber positioning ring 9 is equal to the outer diameter of the annular injection cavity 82 to ensure that the soft rubber positioning ring 9 can be accurately assembled in the annular injection cavity 82. The inner diameter of the soft rubber positioning ring 9 is smaller than the inner diameter of the annular injection cavity 82. The gap between the inner side of the soft rubber positioning ring 9 and the inner side of the annular injection cavity 82 serves to provide an injection hole and to form the soft rubber injection molding cavity 10. The bottom wall of the soft rubber positioning ring 9 is provided with a clearance step 91 for forming the soft rubber injection molding cavity 10.

[0024] The above embodiments are merely preferred embodiments of this utility model and should not be construed as limiting the scope of protection of this utility model. Any non-substantial changes and substitutions made by those skilled in the art based on this utility model shall fall within the scope of protection claimed by this utility model.

Claims

1. A filter end cap characterized by: The end cap body includes a through hole at the center, and the end cap body includes a soft rubber sealing part and a hard rubber connecting part, which are integrally injection molded; the soft rubber sealing part is provided with an annular sealing protrusion.

2. The filter end cap of claim 1, wherein: The connection surface between the side of the annular sealing protrusion away from the through hole and the plane of the soft rubber sealing part is an inclined transition surface.

3. The filter end cap according to claim 1, characterized in that: The connection surface between the soft rubber sealing part and the hard rubber connecting part is stepped.

4. The filter end cap of claim 3, wherein: The connection surface between the soft rubber sealing part and the hard rubber connecting part includes a first horizontal connecting surface, a first vertical connecting surface, a second horizontal connecting surface, and a second vertical connecting surface connected sequentially from the inside out.

5. The filter end cap of claim 4, wherein: The first horizontal connecting surface and the second horizontal connecting surface are wavy.

6. The filter end cap of claim 1, wherein: The inner wall of the soft rubber seal is zigzag-shaped.

7. A forming die for a filter end cap, characterized by: For producing filter end caps as described in any one of claims 1 to 5, the mold body includes a mold body and a soft rubber positioning ring. The mold body has an annular injection cavity that matches the outer contour of the filter end cap. The soft rubber positioning ring is detachably installed in the annular injection cavity, and a soft rubber injection molding cavity that matches the soft rubber sealing part is formed between the soft rubber positioning ring and the bottom wall and side wall of the annular injection cavity.

8. The filter end cap forming die of claim 7, wherein: The bottom wall of the annular injection cavity is provided with an annular groove that matches the annular sealing protrusion.

9. The filter end cap forming die of claim 7, wherein: The outer diameter of the soft rubber positioning ring is equal to the outer diameter of the annular injection cavity; the inner diameter of the soft rubber positioning ring is smaller than the inner diameter of the annular injection cavity, and an injection hole is formed between the inner side of the soft rubber positioning ring and the inner side of the annular injection cavity.

10. The filter end cap forming die of claim 7, wherein: The bottom wall of the soft rubber positioning ring is provided with a clearance step for forming a soft rubber injection molding cavity.

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