Strong waterproof hollow potentiometer

Abstract

The utility model provides a highly waterproof hollow potentiometer which comprises a main body provided with a containing space which is defined by a top plate and side walls and provided with an opening in the bottom face, and the center of the top plate is provided with a first round through hole; the resistance plate and the main body are integrally formed through injection molding, and the resistance plate comprises a substrate, a resistor body formed on the bottom surface of the substrate and two first conductive pins penetrating out of the side wall; the substrate is provided with a second through hole; the bottom plate is a metal component and is combined with the bottom surface of the main body to seal the accommodating space, the edge of the bottom plate extends out of a second conductive pin, and the center of the bottom plate is provided with a third through hole; the bottom end of the rotating shaft penetrates out of the third through hole in a matched mode, and the top end of the rotating shaft penetrates out of the first through hole in a matched mode; an electric brush body is fixed on the rotating shaft near the bottom end in a penetrating manner, and a sealing ring is clamped between the rotating shaft near the top end and the bottom surface of the top plate. Compared with an existing product, the hollow potentiometer is higher in sealing performance.

Description

Technical Field

[0001] The utility model relates to the technical field of potentiometers, in particular to a highly waterproof hollow potentiometer. Background Art

[0002] Hollow potentiometers are electronic components used to adjust current or voltage and are widely used in various electronic devices, such as audio equipment, regulators, and control systems. The hollow potentiometer's central axial through-hole not only facilitates the passage of wiring harnesses for related electronic components, such as sensors, but also significantly reduces product size compared to traditional rotary potentiometers due to the lack of a protruding handle.

[0003] Existing hollow potentiometers have assembled parts. Since the conductive pins are assembled on the housing, the waterproof and dustproof performance can usually only reach IP54 level, which is difficult to meet the needs of some products with higher requirements. Therefore, it is necessary to improve it. Utility Model Content

[0004] The purpose of the utility model is to provide a highly waterproof hollow potentiometer.

[0005] In order to achieve the above purpose, the technical solution adopted by the present utility model is:

[0006] A highly waterproof hollow potentiometer, comprising a main body, which is a plastic material component, including a receiving space with an open bottom surface surrounded by a top plate and side walls, and the center of the top plate has a circular first through hole; a resistor plate, which is integrally injection-molded with the main body, comprises a substrate located on the top surface of the receiving space, a resistor formed on the bottom surface of the substrate, and two first conductive pins electrically connected to the resistor and extending through the side walls; the substrate has a second through hole concentric with the first through hole; a bottom plate, which is a metal component, is adaptively combined with the bottom surface of the main body to close the receiving space. A second conductive pin extends from the edge of the base plate, and the center of the base plate has a third through hole concentric with the first through hole; the rotating shaft is a column with an axial through hole, the bottom end of which fits through the third through hole, and the top end fits through the first through hole; a circular ring-shaped brush body is fixed near the bottom end of the rotating shaft, the bottom surface of the brush body is in contact with the top surface of the base plate, and the top surface is in contact with the resistor body; the rotating shaft has a first step surface facing upward near the top end, and a sealing ring is sandwiched between the first step surface and the bottom surface of the top plate.

[0007] In a preferred embodiment, the base plate and the main body are combined by hot riveting.

[0008] In a preferred embodiment, the edge of the bottom plate radially extends outwardly to form a plurality of spaced flanges, and the bottom end of the side wall extends downwardly to form a edging portion corresponding to the spaced positions of each flange, and the edging portion is covered on the edge of the bottom plate by hot riveting.

[0009] In a preferred embodiment, the edge of the third through hole has a cylindrical portion extending axially downward, and the inner wall of the cylindrical portion is adapted to the outer wall of the rotating shaft.

[0010] In a preferred embodiment, the first through hole has a convex portion extending axially upward, and the inner wall of the convex portion is adapted to the outer wall of the rotating shaft.

[0011] In a preferred embodiment, the brush body comprises a circular sheet-shaped metal plate, a plurality of lower protrusions punched downward from the metal plate for contacting the bottom plate, and brush claws punched upward.

[0012] In a preferred embodiment, the brush claws include a plurality of parallel semicircular claw bodies, wherein the middle portion of the claw body is bent upward to form a convex arc portion, and the convex arc portion is punched upward to form an upper convex point that contacts the resistor body.

[0013] In a preferred embodiment, a bump is protruded from the side wall of the rotating shaft, and a stop block is protruded from the inside of the side wall for limiting the rotation angle of the rotating shaft through the bump.

[0014] The beneficial effects of the present invention are as follows: the main body forms an accommodating space, which is closed by the bottom plate, and the first through hole and the third through hole are respectively blocked by the two ends of the rotating shaft, and a sealing ring is provided at the first through hole for sealing, and the third through hole is usually installed in contact with the PCB board to ensure sealing, and the resistor plate is integrally injection-molded inside, so that the first conductive pin can still remain sealed when passing through the main body. Therefore, compared with existing products, the hollow potentiometer has stronger sealing performance and can reach an IP67 waterproof and dustproof level. BRIEF DESCRIPTION OF THE DRAWINGS

[0015] The present invention will be further described in detail below with reference to the accompanying drawings and specific embodiments.

[0016] Figure 1 The three-dimensional structure of the hollow potentiometer in the embodiment Figure 1 ;

[0017] Figure 2 The three-dimensional structure of the hollow potentiometer in the embodiment Figure 2 ;

[0018] Figure 3 Schematic diagram of the exploded structure of the hollow potentiometer in the embodiment;

[0019] Figure 4 Schematic diagram of the structure of the brush body in the embodiment. DETAILED DESCRIPTION

[0020] The present invention will be further described below with reference to the accompanying drawings:

[0021] The embodiments described with reference to the accompanying drawings are exemplary and are intended to be used to explain the present application, and should not be construed as limiting the present application. In the description of the present application, it should be understood that the orientation or positional relationship indicated in the terms is only for the convenience of describing the present application and simplifying the description, and does not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation. In addition, unless otherwise expressly specified and limited, terms such as "install", "connect", "connect", and "fix" should be understood in a broad sense, and those of ordinary skill in the art can understand the specific meanings of the above terms in the present application according to the specific circumstances.

[0022] refer to Figures 1 to 4 As shown, a highly waterproof hollow potentiometer of this embodiment includes a main body 1, which is a plastic material component, including a bottom-opening receiving space surrounded by a top plate 11 and side walls 12, and the center of the top plate 11 has a circular first through hole 111; a resistor plate 2, which is integrally injection-molded with the main body 1, includes a substrate 21 located on the top surface of the receiving space, a resistor 22 formed on the bottom surface of the substrate 21, and two first conductive pins 23 electrically connected to the resistor 22 and extending through the side walls 12; the substrate 21 has a second through hole 211 concentric with the first through hole 111; a bottom plate 3, which is a metal component, adaptively combined with the bottom surface of the main body 1 to seal The accommodating space is closed, a second conductive pin 31 extends from the edge of the bottom plate 3, and the center of the bottom plate 3 has a third through hole 32 concentric with the first through hole 111; the rotating shaft 4 is a columnar having an axial through hole 41, the bottom end of which fits through the third through hole 32, and the top end fits through the first through hole 111; a circular ring-shaped brush body 5 is fixed near the bottom end of the rotating shaft 4, the bottom surface of the brush body 5 is in contact with the top surface of the bottom plate 3, and the top surface is in contact with the resistor 22; the rotating shaft 4 has a first upward step surface 42 near the top, and a sealing ring 6 is sandwiched between the first step surface 42 and the bottom surface of the top plate 11.

[0023] During assembly, the sealing ring 6 and brush body 5 are first mounted on the rotating shaft 4. The top end of the rotating shaft 4 is then passed through the first through-hole 111, positioning all components on the rotating shaft 4 within the accommodation space. The bottom plate 3 is then passed through the bottom end of the rotating shaft 4 and brought into contact with the bottom end of the side wall 12. Finally, the bottom plate 3 and the bottom end of the side wall 12 are joined together. During use, rotating the rotating shaft 4 drives the brush body 5 to rotate, thereby changing the contact position with the resistor 22 and, in turn, changing the resistance between the first conductive pin 23 and the second conductive pin 31. The main body 1 forms an accommodation space, which is enclosed by the bottom plate 3. The first through-hole 111 and the third through-hole 32 are then sealed at both ends of the rotating shaft 4. A sealing ring 6 is positioned at the first through-hole 111 for sealing. The third through-hole 32 is typically mounted in contact with the PCB to ensure tightness. The resistor plate 2 is integrally injection-molded within the body, ensuring a seal even when the first conductive pin 23 passes through the main body 1.

[0024] In a preferred embodiment, the bottom plate 3 and the main body 1 are combined by heat riveting. Heat riveting can combine the bottom plate 3 and the main body 1 to ensure the reliability and sealing of the combination.

[0025] In a preferred embodiment, the edge of the base plate 3 of this embodiment has a plurality of spaced flanges 33 extending radially outwardly therefrom. A rim portion 121 extends downwardly from the bottom end of the side wall 12 at intervals corresponding to the flanges 33. The rim portion 121 is heat-riveted and applied to the edge of the base plate 3. The rim portion 121 wraps around the edge of the base plate 3, ensuring a secure connection between the two. The staggered arrangement of the flanges 33 and the rim portion 121 restricts rotation of the base plate 3, ensuring structural reliability.

[0026] In a preferred embodiment, the edge of the third through hole 32 of this embodiment has a cylindrical portion 321 extending axially downward, and the inner wall of the cylindrical portion 321 is adapted to the outer wall of the rotating shaft 4. The cylindrical portion 321 increases the bonding area with the rotating shaft 4 along the axial direction, making the sealing stronger.

[0027] In a preferred embodiment, the first through hole 111 of this embodiment has a protrusion 1111 extending axially upward, and the inner wall of the protrusion 1111 is adapted to the outer wall of the shaft 4. The inner wall of the protrusion 1111 increases the bonding area with the shaft 4 along the axial direction, thereby enhancing the sealing performance.

[0028] In a preferred embodiment, the brush body 5 comprises a circular sheet metal plate 51, a plurality of lower protrusions 52 stamped downward from the metal plate 51 for contact with the base plate 3, and brush claws 53 stamped upward. The contact between the lower protrusions 52 and the base plate 3 ensures stable and reliable rotational contact between the two, while also reducing rotational friction.

[0029] In a preferred embodiment, the brush claws 53 of this embodiment comprise several parallel sets of semicircular claws 531. The middle portion of each claw 531 is bent upward to form a convex arc 532. These arcs 532 are stamped with an upper bump 533 for contact with the resistor 22. The semicircular claws 531 are connected to the metal plate 51 at both ends, providing greater resistance to metal fatigue and improved reliability compared to brushes with a single free end. Similarly, the upper bump 533 ensures contact strength while reducing rotational friction with the resistor 22.

[0030] In a preferred embodiment, a protrusion 43 is protruded from the side wall 12 of the rotating shaft 4 , and a stop block is protruded from the inside of the side wall 12 for limiting the rotation angle of the rotating shaft 4 through the protrusion 43 .

[0031] In addition, it should be understood that although this specification is described in terms of implementation methods, not every implementation method contains only one independent technical solution. This narrative method of the specification is only for the sake of clarity. Those skilled in the art should regard the specification as a whole. The technical solutions in each embodiment can also be appropriately combined to form other implementation methods that can be understood by those skilled in the art.

Claims

1. A highly waterproof hollow potentiometer, characterized by: include The main body is a plastic material component, including a receiving space with an open bottom surface surrounded by a top plate and side walls, and the center of the top plate has a circular first through hole; a resistor plate integrally injection-molded with the main body, comprising a base plate located on the top surface of the accommodation space, a resistor formed on the bottom surface of the base plate, and two first conductive pins electrically connected to the resistor and extending through the side wall; the base plate having a second through hole concentric with the first through hole; The bottom plate is a metal component, adapted to be combined with the bottom surface of the main body to enclose the accommodation space, a second conductive pin extending from an edge of the bottom plate, and a third through hole concentric with the first through hole is formed in the center of the bottom plate; The rotating shaft is cylindrical with an axial through hole, the bottom end of which fits through the third through hole, and the top end fits through the first through hole; a circular ring-shaped brush body is fixed near the bottom end of the rotating shaft, the bottom surface of the brush body is in contact with the top surface of the bottom plate, and the top surface is in contact with the resistor body; the rotating shaft has a first upward step surface near the top end, and a sealing ring is sandwiched between the first step surface and the bottom surface of the top plate.

2. A highly waterproof hollow potentiometer according to claim 1, characterized in that: The bottom plate and the main body are combined by hot riveting.

3. A highly waterproof hollow potentiometer according to claim 2, characterized in that: The edge of the bottom plate extends radially outwardly to form a plurality of spaced flanges, and the bottom end of the side wall extends downwardly to form a edging portion corresponding to the spaced positions of the flanges, and the edging portion is covered on the edge of the bottom plate by hot riveting.

4. The highly waterproof hollow potentiometer according to claim 1, characterized in that: The edge of the third through hole has a cylindrical portion extending axially downward, and the inner wall of the cylindrical portion is adapted to the outer wall of the rotating shaft.

5. The highly waterproof hollow potentiometer according to claim 1, characterized in that: The first through hole has a convex portion extending axially upward, and the inner wall of the convex portion is adapted to the outer wall of the rotating shaft.

6. The highly waterproof hollow potentiometer according to claim 1, characterized in that: The brush body comprises a circular sheet-shaped metal plate, a plurality of lower convex points punched downward from the metal plate and in contact with the bottom plate, and brush claws punched upward.

7. The highly waterproof hollow potentiometer according to claim 6, characterized in that: The brush claws include a plurality of parallel semicircular claw bodies. The middle parts of the claw bodies are bent upward to form convex arc parts, and the convex arc parts are punched upward to form upper convex points that contact the resistor body.

8. The highly waterproof hollow potentiometer according to claim 1, characterized in that: A convex block is protruded from the side wall of the rotating shaft, and a stop block is protruded from the inside of the side wall for limiting the rotation angle of the rotating shaft through the convex block.

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