Rubber covering structure based on iron core and copper nut

Abstract

The utility model relates to the technical field of valve core manufacturing, and disclose a rubber covering structure based on iron core and copper nut, including iron core and copper nut, the iron core is combined with copper nut through rubber coating layer and is integrated, one end of copper nut is provided with boss, the corresponding end of iron core is provided with the jackscrew that is adapted with boss, copper nut is assembled in the jackscrew of iron core through boss insertion, and the outer circumferential surface of boss, the assembly end surface of copper nut and the inner wall of jackscrew form the gap between, the utility model discloses the mechanical insertion cooperation of boss and jackscrew, and the adhesive effect formed by combining the rubber coating layer that fills the gap between, constitute the double anti -rotation structure of'mechanical locking + rubber damping ', and this structure can effectively resist water flow impact and operating torque, prevent copper nut from rotating relative to iron core, fundamentally avoid the rubber layer tear and sealing failure problem caused by relative rotation.

Description

Technical Field

[0001] This utility model relates to the field of valve core manufacturing technology, specifically to a rubber-coated structure based on an iron core and a copper nut. Background Technology

[0002] In fluid control valves, the valve core is the core component for realizing the opening and closing of the medium and the regulation of flow. To improve sealing and corrosion resistance, a layer of rubber is often wrapped around the outside of the metal valve core (such as an iron core), forming a rubber coating layer. The copper nut, as a key component connecting to the valve stem, usually needs to be firmly connected to the iron core to ensure that the valve core moves accurately under the drive of the valve stem.

[0003] Traditional valve cores typically use interference fit, threaded connection, or simple mechanical fitting methods to connect the copper nut and iron core. These methods have obvious drawbacks: First, under long-term water flow impact or frequent opening and closing operations, the copper nut is prone to slight rotation or loosening relative to the iron core. This relative movement will cause the rubber covering layer to be sheared and torn, thereby exposing the metal substrate and causing corrosion and sealing failure. Secondly, when the valve core is in the correct position, rigid collisions can easily occur between the metal parts, resulting in vibration and noise, and affecting the service life of the valve. In addition, after long-term use, the valve core assembly may experience slight positional shifts due to wear. Traditional rigid connection structures lack self-correction capabilities, leading to a gradual decrease in valve control accuracy.

[0004] In order to solve the problem of anti-rotation, some existing technologies use mechanical locking structures such as adding pins and keyways. However, this increases the number of parts and assembly complexity, increases manufacturing costs, and may reduce structural reliability due to stress concentration. In terms of vibration reduction, elastic gaskets are usually only set in parts such as valve seats, which have limited effect on absorbing the impact during the valve core's movement.

[0005] Therefore, there is an urgent need in this field for a valve core covering structure with high integration and high reliability. It should be able to effectively prevent relative rotation between the copper nut and the iron core, while having good shock absorption and noise reduction functions and position self-correction capabilities, so as to comprehensively improve the performance and life of the valve. Utility Model Content

[0006] To address the technical problems existing in the background art, this utility model proposes a rubber-coated structure based on an iron core and a copper nut.

[0007] This utility model proposes a rubber-coated structure based on an iron core and a copper nut, which includes an iron core and a copper nut. The iron core and the copper nut are bonded together by a rubber coating layer, and a boss is provided at one end of the copper nut. The corresponding end of the iron core is provided with a slot that matches the boss; The copper nut is inserted into the slot of the iron core through the boss, and a gap is formed between the outer peripheral surface of the boss, the assembly end face of the copper nut and the inner wall of the slot. The rubber coating layer fills the gap and covers the end of the iron core and the assembly part of the copper nut inside, forming a dual anti-rotation structure that combines mechanical fitting and rubber bonding.

[0008] As a further optimization of this utility model, the boss is a square boss, and the boss and the end of the copper nut together form a T-shaped cross-section structure, and the slot is a corresponding T-shaped slot.

[0009] As a further optimization of this utility model, an axial gap of 1.5-2mm is reserved between the bottom surface of the boss and the bottom of the slot, and this gap is filled by the rubber coating layer.

[0010] As a further optimization of this utility model, the rubber coating layer also completely covers the outer surface of the end of the iron core and the outer surface of the assembly end of the copper nut, forming an integral elastic buffer layer.

[0011] As a further optimization of this utility model, the rubber coating layer is an EPDM rubber layer, and the coating layer thickness is 1.5-2mm.

[0012] As a further optimization of this utility model, the iron core is cast from ductile iron, and the surface to be covered is sandblasted and coated with adhesive.

[0013] As a further optimization of this utility model, the copper nut is an H62 brass nut, and the surface to be covered is ultrasonically cleaned and coated with adhesive.

[0014] The rubber-coated structure based on an iron core and a copper nut proposed in this utility model has the following beneficial effects: (i) Through the mechanical insertion and engagement of the boss and the slot, combined with the adhesive effect formed by the rubber coating layer filling the gap, a dual anti-rotation structure of "mechanical locking + rubber damping" is formed. This structure can effectively resist water flow impact and operating torque, prevent the copper nut from rotating relative to the iron core, and fundamentally avoid the problem of rubber layer tearing and sealing failure caused by relative rotation. (ii) The overall rubber layer can absorb the impact energy generated by the collision of metal parts through its own elastic deformation when the valve core is opened and closed, which significantly reduces vibration and noise, improves the smoothness of valve operation and the comfort of use, and helps to extend the service life of the valve. (iii) When the valve core shifts slightly due to long-term use, the rubber layer covering the copper nut and iron core can use its elastic restoring force to finely adjust and correct the position of the components, which helps to maintain the long-term control accuracy of the valve. (iv) The anti-rotation and shock absorption functions are integrated into the integrated rubber-coated structure, which reduces additional parts, simplifies assembly, and the complete rubber coating layer also enhances the overall sealing and corrosion resistance of the valve core.

[0015] Additional aspects and advantages of this invention will be set forth in part in the description which follows, and in part will be obvious from the description, or may be learned by practice of the invention. Attached Figure Description

[0016] Figure 1 This is a cross-sectional structural diagram of the present invention; Figure 2 This is a schematic diagram of the external three-dimensional structure of the present invention; Figure 3 This is a three-dimensional structural diagram of the copper nut of this utility model.

[0017] Figure descriptions: 1. Iron core; 2. Copper nut; 3. Boss; 4. Slot; 5. Rubber coating layer. Detailed Implementation

[0018] The embodiments of this utility model are described in detail below. Examples of these embodiments are illustrated in the accompanying drawings, wherein the same or similar symbols denote the same or similar elements or elements having the same or similar functions throughout. The embodiments described below with reference to the accompanying drawings are exemplary and are only used to explain this utility model, and should not be construed as limiting this utility model.

[0019] In this utility model, unless otherwise explicitly specified and limited, "above" or "below" the second feature can mean that the first feature is in direct contact with the second feature, or that the first feature is in indirect contact with the second feature through an intermediate medium. Furthermore, "above," "on top of," and "over" the second feature can mean that the first feature is directly above or diagonally above the second feature, or simply that the first feature is at a higher horizontal level than the second feature. "Below," "below," and "under" the second feature can mean that the first feature is directly below or diagonally below the second feature, or simply that the first feature is at a lower horizontal level than the second feature.

[0020] Please see Figures 1-3 A rubber-coated structure based on an iron core and a copper nut includes an iron core 1 and a copper nut 2. The lower outer periphery of the copper nut 2 has a boss 3, and the upper end of the iron core 1 has a slot 4. The lower end of the copper nut 2 is assembled by inserting the boss 3 into the slot 4. There are gaps between the inner wall of the slot 4 and the lower end of the copper nut 2 and the outer wall of the boss 3. The gaps are filled by a rubber coating layer 5 to form a dual anti-rotation structure of "mechanical locking + rubber damping". The rubber coating layer 5 covers the outer wall of the upper end of the iron core 1 and the copper nut 2 to form an elastic buffer layer. When the valve core opens and closes, the copper nut 2 contacts the iron core through the rubber coating layer 5. The rubber compression deformation of the rubber coating layer 5 absorbs the impact energy. The rubber coating layer 5 on the outer periphery of the copper nut 2 undergoes shear deformation when the valve stem moves axially, which consumes vibration energy. When the valve core deviates slightly due to wear, the rubber coating layer 5 on the outer periphery of the copper nut 2 pushes the iron core 1 to reset and correct the accuracy through elastic restoring force. The rubber coating layer 5 between the copper nut 2 and the iron core 1 also has viscoelasticity, which can compensate for the angular deviation of the valve core. The above structure breaks through the anti-rotation and vibration reduction bottleneck of traditional rubber coating technology, providing a new solution for the long life and high-precision operation of fluid control components.

[0021] In one embodiment, the boss 3 is a square boss and forms a T-shaped protrusion with the lower end of the copper nut 2. The slot 4 is a T-shaped slot and is inserted and assembled with the protrusion. There is a 1.5-2mm gap between the bottom surface of the boss 3 and the bottom surface of the inner cavity of the slot 4 for rubber filling compensation. Core 1 is made of ductile iron and is formed by casting. The copper nut 2 is made of H62 brass with a hardness of ≥150HV. Its shape is formed by die casting and its inner hole is tapped for threaded connection with the valve stem. The rubber coating layer 5 is made of EPDM rubber with a thickness of 1.5-2mm, a Shore hardness of 50-70A, and a rubber formulation of EPDM + carbon black + vulcanizing agent DCP. The Mooney viscosity ML1+4 100℃ ≤80.

[0022] In one embodiment, the specific encapsulation process for this structure is as follows: S1. The surface of the iron core 1 is sandblasted to remove the oxide layer and then coated with adhesive to enhance the rubber adhesion. S2, copper nut 2 is ultrasonically cleaned to remove oil stains, and adhesive is brushed onto the outer surface; S3. Insert the copper nut 2 into the slot 4 at the end of the iron core 1, leaving a 1.5-2mm gap between the bottom surface of the boss 3 and the bottom surface of the slot 4. S4. Align the upper and lower cavities of the rubber-coating mold with the positioning positions of the iron core 1 and the copper nut 2, and then inject high-temperature liquefied rubber liquid through the injection channel on the side of the mold. The mold temperature is 150-165℃, the injection pressure is 15-18MPa, and the rubber is used to ensure that the gaps are filled densely. The holding time is 12-20 minutes, and the cooling time is 5 minutes.

[0023] 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 rubber-coated structure based on an iron core and a copper nut, comprising an iron core (1) and a copper nut (2), wherein the iron core (1) and the copper nut (2) are bonded together by a rubber coating layer (5), characterized in that: A boss (3) is provided at one end of the copper nut (2); The corresponding end of the iron core (1) is provided with a slot (4) that matches the boss (3). The copper nut (2) is inserted into the slot (4) of the iron core (1) through the boss (3), and a gap is formed between the outer peripheral surface of the boss (3), the assembly end face of the copper nut (2) and the inner wall of the slot (4). The rubber coating layer (5) fills the gap and covers the end of the iron core (1) and the assembly part of the copper nut (2) inside it, forming a dual anti-rotation structure that combines mechanical fitting and rubber bonding.

2. The rubber-coated structure based on an iron core and a copper nut according to claim 1, characterized in that, The boss (3) is a square boss, and the boss (3) and the end of the copper nut (2) together form a T-shaped cross-section structure. The slot (4) is a corresponding T-shaped slot.

3. The rubber-coated structure based on an iron core and a copper nut according to claim 2, characterized in that, An axial gap of 1.5-2mm is reserved between the bottom surface of the boss (3) and the bottom of the slot (4), and the gap is filled by the rubber covering layer (5).

4. The rubber-coated structure based on an iron core and a copper nut according to claim 1, characterized in that, The rubber coating layer (5) also completely covers the outer surface of the end of the iron core (1) and the outer surface of the assembly end of the copper nut (2), forming an integral elastic buffer layer.

5. The rubber-coated structure based on an iron core and a copper nut according to claim 1, characterized in that, The rubber coating layer (5) is an EPDM rubber layer, and the coating layer thickness is 1.5-2mm.

6. The rubber-coated structure based on an iron core and a copper nut according to claim 1, characterized in that, The iron core (1) is cast from ductile iron, and the surface to be covered is sandblasted and coated with adhesive.

7. The rubber-coated structure based on an iron core and a copper nut according to claim 1, characterized in that, The copper nut (2) is an H62 brass nut, and the surface to be covered is ultrasonically cleaned and coated with adhesive.

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