Potentiometer and equipment regulator

Abstract

The utility model relates to the technical field of potentiometers, and provides a potentiometer and an equipment regulator, which comprise a shell, and a rotating shaft, an electric brush, a resistor disc and a connecting piece which are arranged in the shell, the integrated rotating shaft is arranged to drive the electric brush to rotate, rotating resistance changing of the potentiometer is achieved, meanwhile, the shaft sleeve and the upper cover which are sealed and covered are matched, the electric brush and the resistor disc are sealed in the mounting cavity, and at the moment, the connecting piece is embedded into the square groove to achieve tight clamping so as to separate the mounting cavity from the outside. Therefore, the plug-and-play function of external equipment is met, and the tedious wire welding process of a traditional potentiometer is omitted; the installation cavity with good sealing performance effectively improves the dustproof and waterproof capability of the product so as to actually adapt to the application environment, and guarantees the use stability and the service life of the product.

Description

Technical Field

[0001] This utility model relates to the field of potentiometer technology, and in particular to a potentiometer and device regulator. Background Technology

[0002] A potentiometer is a type of variable resistor, typically consisting of a resistive element and a rotating or sliding system. It works by moving a contact along the resistive element to change the value of the resistance and thus obtain a partial voltage output.

[0003] Potentiometers need to be connected to the circuit (usually a PCB board) for application. The two main connection methods are as follows:

[0004] (1) By inserting the potentiometer pins into holes on the PCB board and soldering or connecting them via lead wires;

[0005] (2) A connector structure is set on the potentiometer, and then it is connected to an external plug through a connector.

[0006] Existing potentiometers with connector structures, such as the Chinese patent "Resistance Sensor" with publication number CN218329750U, have a central opening, thus lacking a sealing effect. However, since potentiometers are often used in household appliances, where the environment frequently contains moisture and leaks, product stability is poor, frequently leading to product failure. Furthermore, current potentiometer technology typically uses an assembled rotating shaft and rotating block; because these two modules are not a single unit, they need to be riveted together, resulting in higher material and manufacturing costs.

[0007] In addition, in the application of the corresponding potentiometer (water level sensor / water level regulator), the existing potentiometer is limited to installation on the customer's panel. Therefore, it can only be fixed to the housing by screw thread locking nuts. This not only poses a risk of loosening due to vibration, but also, due to the humid application environment, traditional metal nuts may rust, further affecting the contact stability of the potentiometer. Utility Model Content

[0008] This utility model provides a potentiometer and device regulator, which solves the technical problems of poor sealing, unstable installation, inability to adapt to the application environment, resulting in poor product stability and short lifespan of existing potentiometers.

[0009] To solve the above technical problems, this utility model provides a potentiometer, including a housing, and a rotating shaft, brush, resistor, and connector installed inside the housing;

[0010] The housing includes a bushing and a top cover, which are sealed together to form an installation cavity. A square groove is provided at the front end of the installation cavity.

[0011] One end of the rotating shaft is installed inside the bushing and rotatably connected to the upper cover, while the other end passes through the bushing and is connected to an external operating end.

[0012] The brush is nested at one end of the rotating shaft and is also electrically connected to the resistor.

[0013] One end of the connector is connected to the resistor sheet, and the other end is connected to an external device. Its middle part is tightly engaged with the square groove to isolate the mounting cavity from the outside.

[0014] This basic design proposes a novel potentiometer. An integrated rotating shaft drives the brush to rotate, achieving variable resistance. Simultaneously, a sealed bushing and top cover seal the brush and resistance element within the mounting cavity. A connector is then embedded in a square groove for a tight fit, isolating the mounting cavity from the outside. This design achieves plug-and-play functionality for external devices, eliminating the cumbersome wire bonding process of traditional potentiometers. The well-sealed mounting cavity effectively improves the product's dust and water resistance, adapting it to various application environments and ensuring product stability and lifespan.

[0015] In a further embodiment, the rotating shaft includes a connecting part, a supporting part, and a stop part connected in sequence. The connecting part passes through the bushing and is connected to an external operating end. The supporting part is limited inside the bushing, and the stop part is provided in its middle.

[0016] The brush is nested on the front of the support part; the stop part includes a support platform at the bottom and a stop post at the center of the support platform, the stop post being embedded in the upper cover; the main body of the stop post is a cylindrical structure with a curved top edge.

[0017] This solution features an integrated connecting section, support section, and stop section forming a multi-functional rotating shaft. The connecting section connects to the user's operating terminal to transmit user commands. The stop section, through its contact with the top cover, enables rotational control of the rotating shaft with the stop section as its base point. The support section carries and mounts the brushes, converting user commands into brush rotation and supporting contact between the brushes and the resistor elements. The rotating shaft combines rotation, brush support, and stop functions. The integrated design reduces assembly errors, improves environmental adaptability, simplifies the structure for miniaturization, and reduces costs.

[0018] In a further embodiment, the front of the support portion is a bearing platform facing the brush, and at least one positioning post is provided on the bearing platform; the positioning post protrudes upward and is riveted to the brush.

[0019] The back of the support portion consists of, from the inside to the outside, the connecting portion, the support seat, and the limiting seat. The support seat surrounds the outside of the connecting portion and abuts against the bushing. It is a ring-shaped structure surrounding the connecting portion, and an upwardly recessed gap is formed between it and the connecting portion. The limiting seat is spatially limited with the bushing and is provided with a horizontally outwardly extending protrusion.

[0020] When the external operating terminal is rotated, the connecting part drives the rotating shaft to rotate around the stop post, and then the positioning post limits the rotation of the brush, adjusting the connection position between the brush and the resistor to change the value of the connected resistance.

[0021] This solution addresses the rotary resistance control principle within the potentiometer by incorporating a through-fitting rotating shaft and bushing. Firstly, a support platform with positioning posts supports and positions the brush, ensuring precise brush movement and superior linearity of the output resistance. Secondly, a support base creates an upwardly recessed groove between itself and the connecting part, accommodating assembly errors (concentricity deviation between the shaft and bushing) while reducing friction and ensuring operational sensitivity. Thirdly, a limit seat controls rotation, preventing the shaft from exceeding the designed angle, and a clearly defined rotation endpoint provides tactile feedback.

[0022] In a further embodiment, the bushing is recessed downward to form a cavity, and its front end extends forward to form a square groove that mates with the connector; the front end of the square groove has a larger cross-section than the rear end, and its rear end is tightly engaged with the connector; the bottom of the cavity forms a mating hole that is nested with the rotating shaft; an upwardly protruding stop block is provided at the front end of the cavity and the rear side of the square groove, and the stop block is spatially limited by the rotating shaft.

[0023] This design features a square groove on the bushing with a front end slot cross-section larger than the rear end slot cross-section. The tight engagement of the square groove with the connector isolates the mounting cavity from the outside, effectively preventing dust, metal shavings, moisture, and other contaminants from entering the bushing and extending the product's lifespan. It also provides a connection interface to external devices, enabling plug-and-play functionality.

[0024] In a further embodiment, the bushing sidewall is provided with an L-shaped locking position, an installation locking position and a support position from the outside to the inside;

[0025] The L-shaped locking position is located on the outer side of the bushing sidewall, and its inner ring is recessed downward to fit and install with the upper cover.

[0026] The inner top of the bushing is recessed downward to form the support position to support the resistor sheet;

[0027] The mounting slot is provided with at least one inwardly protruding positioning block, which engages with the outer edge of the resistor sheet.

[0028] This design incorporates a support position within the bushing, combined with an inwardly protruding positioning block, to secure the resistor element in a snap-fit ​​configuration. This ensures the stability of the resistor element during installation, thereby guaranteeing the operational stability of the potentiometer.

[0029] In a further embodiment, the connector includes at least one set of pins and a fixing block covering the middle of the pins; the fixing block is hermetically installed with the square groove; one end of the pin is welded and fixed to the resistor sheet, and the other end extends outward through the square groove to connect with an external device.

[0030] This solution features a fixing block that covers the middle of the PIN pin. While fixing the PIN pin, it is also sealed to the square groove, achieving the dual functions of sealing and fixing the PIN pin (providing an interface).

[0031] In a further embodiment, the upper cover has a downwardly protruding positioning sleeve in the middle of the back side, a downwardly protruding first stop bar on the inner side of the back edge, and an indicator cover extending forward at the front end to cooperate with the square groove; the positioning sleeve is a cylindrical structure rotatably connected to the rotating shaft; the first stop bar cooperates with the L-shaped locking position.

[0032] This design incorporates a first stop bar and an L-shaped locking mechanism to align the top cover and bushing, effectively reducing installation difficulty. Furthermore, by applying waterproof adhesive to the joint, the waterproof performance can be further improved.

[0033] In a further embodiment, the resistor sheet has a through-hole in the middle to avoid the rotating shaft, a serrated groove on the edge to fit and fix with the bushing, and a welding hole at the front end to connect with the connector.

[0034] The brush includes at least an inner brush claw contact and an outer brush claw contact. The inner brush claw contact contacts the silver film on the resistive sheet, and the outer brush claw contact contacts the carbon film on the resistive sheet.

[0035] In a further embodiment, the upper cover sidewall is provided with a vertically penetrating first mounting hole, and the bushing sidewall is provided with a vertically penetrating second mounting hole; the first mounting hole and the second mounting hole are aligned vertically; rivets are embedded in the first mounting hole and the second mounting hole to assemble and install the upper cover and the bushing.

[0036] This solution utilizes rivets in conjunction with the first and second mounting holes for fastening, achieving stable assembly while ensuring the airtightness of the mounting cavity.

[0037] This utility model also provides a device regulator, including the potentiometer as described above, and a mounting plate; the mounting plate has a snap-fit ​​position in the middle of its surface and a positioning mounting hole penetrating the surface on its outer side; the center of the snap-fit ​​position is a clearance hole penetrating the surface, and a limiting strip surrounding the bottom of the potentiometer is provided outside the clearance hole; the snap-fit ​​position has buckles pointing towards the center on both sides, the lower part of the buckles is vertically fixed to the plate surface, and the upper end extends inward to limit the space of the potentiometer.

[0038] The basic solution's equipment regulators (such as washing machine water level regulators, motor speed control modules, and program selection knob modules) are equipped with mounting plates that work with potentiometers. Limiting strips enable rapid positioning of the potentiometers and prevent displacement during use (spatial limitation on the horizontal plane). A simple buckle design limits the potentiometers vertically. The elastic deformation of the buckle generates continuous clamping force to prevent the potentiometers from loosening due to vibration or impact. Assembly is simple, convenient, and efficient, effectively improving installation efficiency while ensuring mechanical reliability. Attached Figure Description

[0039] Figure 1 This is an exploded view of a potentiometer provided in Embodiment 1 of this utility model;

[0040] Figure 2 This is provided by Embodiment 1 of the present utility model. Figure 1 Another perspective view;

[0041] Figure 3 This is provided by Embodiment 1 of the present utility model. Figure 1 Assembly structure diagram;

[0042] Figure 4 This is provided by Embodiment 1 of the present utility model. Figure 1 A three-dimensional structural diagram of the central rotating shaft 3;

[0043] Figure 5 This is provided by Embodiment 1 of the present utility model. Figure 1 Assembly diagram of the rotating shaft 3 and brush 4;

[0044] Figure 6 This is provided by Embodiment 1 of the present utility model. Figure 1 3D structural diagram of central bushing 1;

[0045] Figure 7 This is provided by Embodiment 1 of the present utility model. Figure 1 Assembly diagram of the central bushing 1 and the rotating shaft 3;

[0046] Figure 8 This is provided by Embodiment 1 of the present utility model. Figure 1 3D structural diagram of the upper and middle cover 2;

[0047] Figure 9 This is provided by Embodiment 1 of the present utility model. Figure 1 Assembly diagram of the medium resistance element 5 and the connector 6;

[0048] Figure 10 This is a three-dimensional structural diagram of a device regulator provided in Embodiment 2 of this utility model;

[0049] Figure 11 This is an assembly diagram provided in Embodiment 2 of this utility model.

[0050] The components include: bushing 1, square groove 11, mating hole 12, stop block 13, L-shaped slot 14, mounting slot 15, support position 16, second mounting hole 17, mounting sleeve 18; top cover 2, positioning sleeve 21, first stop bar 22, indicator cover 23, first mounting hole 24; rotating shaft 3, connecting part 31, support part 32, stop part 33; brush 4, inner brush claw contact 41, outer brush claw contact 42, positioning hole 43; resistor sheet 5, serrated groove 51, welding hole 52, silver film 53, carbon film 54; connector 6, PIN pin 61, fixing block 62; mounting plate 7, positioning mounting hole 71, clearance hole 72, limit bar 73, buckle 74; rivet 8.

[0051] Support platform 331, stop post 332; positioning post 321, support seat 322, limit seat 323. Detailed Implementation

[0052] The embodiments of this utility model are described in detail below with reference to the accompanying drawings. The embodiments are given for illustrative purposes only and should not be construed as limiting the utility model. The accompanying drawings are for reference and illustration only and do not constitute a limitation on the scope of patent protection of this utility model, because many changes can be made to this utility model without departing from the spirit and scope of this utility model.

[0053] Example 1

[0054] This utility model provides a potentiometer, such as Figures 1-9 As shown, in this embodiment, it includes a housing, and a rotating shaft 3, a brush 4, a resistor 5, and a connector 6 installed inside the housing;

[0055] The housing includes a bushing 1 and an upper cover 2, which are sealed together to form an installation cavity. A square groove 11 is provided at the front end of the installation cavity.

[0056] One end of the rotating shaft 3 is installed inside the bushing 1 and rotatably connected to the upper cover 2, and the other end passes through the bushing 1 and is connected to the external operating end;

[0057] The brush 4 is nested at one end of the rotating shaft 3 and is also electrically connected to the resistor 5;

[0058] One end of the connector 6 is connected to the resistor 5, and the other end is connected to an external device. Its middle part is tightly engaged with the square groove 11 to isolate the mounting cavity from the outside.

[0059] In this embodiment, see Figure 4 , Figure 5 The rotating shaft 3 includes a connecting part 31, a supporting part 32 and a stop part 33 connected in sequence. The connecting part 31 passes through the bushing 1 and is connected to the external operating end. The supporting part 32 is limited to the inside of the bushing 1, and the stop part 33 is provided in its middle.

[0060] The brush 4 is nested on the front of the support part 32; the stop part 33 includes a support platform 331 at the bottom and a stop post 332 at the center of the support platform 331, the stop post 332 is embedded in the upper cover 2; the main body of the stop post 332 is a cylindrical structure, and its top edge is a curved design.

[0061] In this embodiment, a multifunctional rotating shaft 3 is formed by an integrated connecting part 31, a support part 32, and a stop part 33. The connecting part 31 connects to the user operation terminal to transmit user operations. The rotation of the rotating shaft 3 is controlled by the stop part 33 as the base point through the contact between the stop part 33 and the upper cover 2. The support part 32 supports and installs the brush 4 to convert the user operation into the rotation of the brush 4 and supports the contact between the brush 4 and the resistor 5. The rotating shaft 3 has the functions of rotation, supporting the brush 4, and stopping. The integrated design reduces assembly errors, improves environmental adaptability, simplifies the structure and is suitable for miniaturization design, and has a lower cost.

[0062] In this embodiment, the front of the support part 32 is a bearing platform facing the brush 4, and at least one positioning post 321 is provided on the bearing platform; the positioning post 321 protrudes upward and is riveted to the brush 4.

[0063] The back of the support portion 32 consists of, from the inside to the outside, the connecting portion 31, the support base 322, and the limiting seat 323. The support base 322 surrounds the outside of the connecting portion 31 and abuts against the bushing 1. It is a ring-shaped structure surrounding the connecting portion 31, and an upwardly recessed gap is formed between it and the connecting portion 31. The limiting seat 323 spatially limits the bushing 1 and is provided with a horizontally outwardly extending protrusion.

[0064] When the external operating terminal is rotated, the connecting part 31 drives the rotating shaft 3 to rotate around the stop post 332, and then the positioning post 321 limits the rotation of the brush 4, adjusting the connection position of the brush 4 and the resistor piece 5 to change the value of the connected resistance.

[0065] This embodiment addresses the rotary resistance control principle within the potentiometer by setting up a through-fitting rotating shaft 3 and bushing 1. On one hand, a support platform with a positioning post 321 is provided to support and fix the brush 4, ensuring precise movement of the brush 4 and superior linearity of the output resistance value. On the other hand, a support base 322 is provided, forming an upwardly recessed groove between it and the connecting part 31. This reduces friction and ensures operational sensitivity while accommodating assembly errors (concentricity deviation between the shaft and bushing 1). Furthermore, a limit seat 323 controls rotation, preventing the shaft from rotating beyond the designed angle, and a clear rotation endpoint provides tactile feedback.

[0066] In this embodiment, see Figure 6 , Figure 7 The bushing 1 has a cavity formed by a downward recess in the middle and a square groove 11 that fits with the connector 6 at the front end. The cross-section of the front end of the square groove 11 is larger than the cross-section of the rear end, and the rear end of the groove is tightly engaged with the connector 6. A mating hole 12 that is nested with the rotating shaft 3 is formed through the bottom of the cavity. An upwardly protruding stop block 13 is provided at the front end of the cavity and the rear side of the square groove 11. The stop block 13 is spatially limited by the limiting seat 323 on the rotating shaft 3.

[0067] The bushing 1 extends vertically downward from its back side to form a mounting cylinder 18, and the outer side wall of the mounting cylinder 18 is provided with mounting threads.

[0068] In this embodiment, a square groove 11 with a front end slot cross-section larger than the rear end slot cross-section is provided on the bushing 1. The square groove 11 and the connector 6 are tightly engaged to isolate the installation cavity from the outside, which can effectively prevent dust, metal shavings, moisture and other contaminants from entering the bushing 1, thereby improving the product's service life. At the same time, it provides a connection interface with external equipment to realize the plug-and-play function.

[0069] In this embodiment, the side wall of the bushing 1 is provided with an L-shaped locking position 14, a mounting locking position 15 and a supporting position 16 from the outside to the inside.

[0070] The L-shaped locking position 14 is located on the outer side wall of the bushing 1, and its inner ring is recessed downward to fit and install with the upper cover 2.

[0071] The inner top of the bushing 1 is recessed downward to form the support position 16 to support the resistor piece 5;

[0072] The mounting slot 15 is provided with at least one inwardly protruding positioning block, which engages with the outer edge of the resistor piece 5.

[0073] In this embodiment, a support position 16 is provided inside the bushing 1, which, combined with an inwardly protruding positioning block, allows for the snap-fit ​​installation of the resistor 5. This ensures the stability of the resistor 5 during installation, thereby guaranteeing the working stability of the potentiometer.

[0074] In this embodiment, the connector 6 includes at least one set of PIN pins 61 and a fixing block 62 covering the middle of the PIN pins 61; the fixing block 62 is sealed to the square groove 11; one end of the PIN pin 61 is bent upward and welded to the resistor sheet 5, and the other end extends outward through the square groove 11 to connect with an external device.

[0075] By connecting different pins on PIN pin 61 with different resistor pieces 5 (or different soldering pins of resistor pieces 5), different circuits required by different customers / applications can be provided.

[0076] In this embodiment, a fixing block 62 is provided to cover the middle of the PIN pin 61. While fixing the PIN pin 61, it is also sealed to the square groove 11 (specifically, the fixing block 62 on the connector 6 is coated with waterproof glue and then embedded into the square groove 11), thus achieving the dual functions of sealing and fixing the PIN pin 61 (providing an interface).

[0077] In this embodiment, the upper cover 2 has a downwardly protruding positioning sleeve 21 in the middle of the back side, a downwardly protruding first stop bar 22 on the inner side of the back edge, and an indicator cover 23 extending forward at the front end to cooperate with the square groove 11; the positioning sleeve 21 is a cylindrical structure rotatably connected to the rotating shaft 3; the first stop bar 22 cooperates with the L-shaped locking position 14.

[0078] In this embodiment, the first stop bar 22 and the L-shaped locking position 14 are set to achieve the alignment of the upper cover 2 and the bushing 1, which effectively reduces the installation difficulty. At the same time, the waterproof performance can be further improved by applying waterproof adhesive to the joint.

[0079] In this embodiment, see Figure 8 The upper cover 2 has a vertically penetrating first mounting hole 24 on its side wall, and the bushing 1 has a vertically penetrating second mounting hole 17 on its side wall; the first mounting hole 24 and the second mounting hole 17 are aligned vertically; rivets 8 are embedded in the first mounting hole 24 and the second mounting hole 17 to assemble the upper cover 2 and the bushing 1.

[0080] Preferably, after the upper cover 2 and the bushing 1 are installed, waterproof adhesive can be further filled into the first mounting hole 24 and the second mounting hole 17 to achieve a more thorough sealing effect.

[0081] In this embodiment, rivets 8 are used in conjunction with the first mounting hole 24 and the second mounting hole 17 for fastening and installation. At the same time, waterproof glue is filled in, which not only achieves stable assembly, but also further improves the airtightness of the installation cavity.

[0082] In this embodiment, see Figure 9 The resistor 5 has a through-hole in the middle to avoid the rotating shaft 3, and a serrated groove 51 on the edge to fit and fix it with the bushing 1. The front end has a welding hole 52 to connect with the connector 6. The resistor 5 is engaged with the positioning block on the bushing 1 through the serrated groove 51 and is pressed and fixed by the upper cover 2.

[0083] The PIN pin 61 is inserted into the soldering hole 52 for soldering installation.

[0084] The brush 4 includes at least an inner brush claw contact 41, an outer brush claw contact 42, and a through positioning hole 43. The inner brush claw contact 41 contacts the silver film 53 on the resistive sheet 5, the outer brush claw contact 42 contacts the carbon film 54 on the resistive sheet 5, and the positioning hole 43 is nested and riveted with the positioning post 321.

[0085] Among them, the different contact positions of the "inner brush claw contact 41, outer brush claw contact 42 + resistor sheet" on the brush can form different combinations of variable resistance pins, and then the required variable resistance interface circuit can be provided to different customers / applications through the PIN pin 61 to meet the needs of different users / applications.

[0086] This utility model embodiment designs a novel potentiometer. An integrated rotating shaft 3 drives the brush 4 to rotate, achieving variable resistance. Simultaneously, a sealed bushing 1 and a top cover 2 seal the brush 4 and resistive element 5 within the mounting cavity. A connector 6 is then embedded in a square groove 11 for a tight fit, isolating the mounting cavity from the outside. This design achieves plug-and-play functionality for external devices, eliminates the cumbersome wire bonding process of traditional potentiometers, and provides a well-sealed mounting cavity, effectively improving the product's dust and water resistance to adapt to various application environments and ensuring product stability and lifespan.

[0087] Example 2

[0088] This utility model embodiment also provides a device regulator, in which see... Figure 10 , Figure 11 The device includes a potentiometer as described in Embodiment 1 above, and a mounting plate 7. The mounting plate 7 has a snap-fit ​​position in the middle of its surface and a positioning mounting hole 71 that penetrates the surface of the plate on its outer side. The center of the snap-fit ​​position is a clearance hole 72 that penetrates the surface of the plate, and a limiting strip 73 that surrounds the bottom of the potentiometer is provided on the outer side of the clearance hole 72. The snap-fit ​​position has buckles 74 pointing to the center on both sides. The lower part of the buckle 74 is vertically fixed to the plate surface, and the upper end extends inward to limit the space of the potentiometer.

[0089] The potentiometer can be quickly and easily positioned and snapped into the casing of the client (e.g., a washing machine) through the positioning mounting hole 71 on the mounting plate 7.

[0090] Preferably, the mounting plate 7 is made of one piece of plastic, so the buckle 74 has a certain deformation capacity to clamp the potentiometer, thereby adapting to humid environments and / or vibrating working conditions, ensuring the stability of the equipment.

[0091] In practical applications, the top cover 2 points towards the controlled equipment, and the rotating shaft 3 points towards the user's operating end. At this time, the first mounting hole 24 on the top cover 2 is covered by rivets 8 and waterproof glue, and the groove of the mounting cavity is sealed by the fixing block 62. Therefore, moisture and dust from the equipment end cannot enter the mounting cavity through the top cover. At the same time, the gap between the top cover 2 and the bushing 1 is sealed by waterproof glue, so moisture and dust from the equipment end cannot enter the mounting cavity through the gap. In addition, through the contact between the stop post 332 and the top cover 2, the support seat 322 of the rotating shaft 3 abuts against the housing of the bushing 1, thereby effectively preventing dust or moisture from entering and ensuring the stability of the working environment inside the mounting cavity.

[0092] The device regulator (e.g., water level regulator of a washing machine, motor speed control module, program selection knob module) of this utility model embodiment is equipped with a mounting plate 7 that cooperates with the potentiometer. The limiting strip 73 is used to realize the rapid positioning of the potentiometer and prevent displacement of the working position (spatial limitation on the horizontal plane). The simple buckle 74 is designed to limit the potentiometer in the vertical direction. The elastic deformation of the buckle 74 generates a continuous clamping force to prevent the potentiometer from loosening due to vibration or impact. The assembly is simple, convenient and efficient. While ensuring mechanical reliability, it effectively improves the installation efficiency.

[0093] The above embodiments are preferred embodiments of the present utility model, but the embodiments of the present utility model are not limited to the above embodiments. Any changes, modifications, substitutions, combinations, or simplifications made without departing from the spirit and principle of the present utility model shall be considered equivalent substitutions and shall be included within the protection scope of the present utility model.

Claims

1. A potentiometer, characterized in that: It includes a housing, and a rotating shaft, brushes, resistors, and connectors installed within the housing; The housing includes a bushing and a top cover, which are sealed together to form an installation cavity. A square groove is provided at the front end of the installation cavity. One end of the rotating shaft is installed inside the bushing and rotatably connected to the upper cover, while the other end passes through the bushing and is connected to an external operating end. The brush is nested at one end of the rotating shaft and is also electrically connected to the resistor. One end of the connector is connected to the resistor sheet, and the other end is connected to an external device. Its middle part is tightly engaged with the square groove to isolate the mounting cavity from the outside.

2. A potentiometer as described in claim 1, characterized in that: The rotating shaft includes a connecting part, a supporting part, and a stop part connected in sequence. The connecting part passes through the bushing and is connected to an external operating end. The supporting part is limited inside the bushing, and the stop part is provided in its middle. The brush is nested on the front of the support part; the stop part includes a support platform at the bottom and a stop post at the center of the support platform, the stop post being embedded in the upper cover; the main body of the stop post is a cylindrical structure with a curved top edge.

3. A potentiometer as described in claim 2, characterized in that: The front of the support portion is a bearing platform facing the brush, and at least one positioning post is provided on the bearing platform; the positioning post protrudes upward and is riveted to the brush. The back of the support portion consists of, from the inside to the outside, the connecting portion, the support seat, and the limiting seat. The support seat surrounds the outside of the connecting portion and abuts against the bushing. It is a ring-shaped structure surrounding the connecting portion, and an upwardly recessed gap is formed between it and the connecting portion. The limiting seat is spatially limited with the bushing and is provided with a horizontally outwardly extending protrusion. When the external operating terminal is rotated, the connecting part drives the rotating shaft to rotate around the stop post, and then the positioning post limits the rotation of the brush, adjusting the connection position between the brush and the resistor to change the value of the connected resistance.

4. A potentiometer as described in claim 1, characterized in that: The bushing is recessed in the middle to form a cavity, and the front end extends forward to form a square groove that fits with the connector; the front end of the square groove has a larger cross-section than the rear end, and the rear end of the groove is tightly engaged with the connector; the bottom of the cavity forms a mating hole that is nested with the rotating shaft; the front end of the cavity and the rear side of the square groove are provided with an upwardly protruding stop block, which limits the space between the stop block and the rotating shaft.

5. A potentiometer as described in claim 4, characterized in that: The bushing sidewall is provided with an L-shaped locking position, a mounting locking position and a support position from the outside to the inside; The L-shaped locking position is located on the outer side of the bushing sidewall, and its inner ring is recessed downward to fit and install with the upper cover. The inner top of the bushing is recessed downward to form the support position to support the resistor sheet; The mounting slot is provided with at least one inwardly protruding positioning block, which engages with the outer edge of the resistor sheet.

6. A potentiometer as described in claim 1, characterized in that: The connector includes at least one set of pins and a fixing block covering the middle of the pins; the fixing block is sealed to the square groove; one end of the pin is welded to the resistor sheet, and the other end extends outward through the square groove to connect to an external device.

7. A potentiometer as described in claim 5, characterized in that: The upper cover has a downward-protruding positioning sleeve in the middle of the back side, a downward-protruding first stop bar on the inner side of the back edge, and an indicator cover that extends forward at the front end to cooperate with the square groove; the positioning sleeve is a cylindrical structure that is rotatably connected to the rotating shaft; the first stop bar cooperates with the L-shaped locking position.

8. A potentiometer as described in claim 4, characterized in that: The resistor sheet has a through-hole in the middle to avoid the rotating shaft, and the edge is provided with a serrated groove to fit and fix with the bushing. The front end is provided with a welding hole to connect with the connector. The brush includes at least an inner brush claw contact and an outer brush claw contact. The inner brush claw contact contacts the silver film on the resistive sheet, and the outer brush claw contact contacts the carbon film on the resistive sheet.

9. A potentiometer as described in claim 7, characterized in that: The upper cover has a vertically penetrating first mounting hole on its side wall, and the bushing has a vertically penetrating second mounting hole on its side wall; the first mounting hole and the second mounting hole are aligned vertically; rivets are embedded in the first mounting hole and the second mounting hole to assemble the upper cover and the bushing.

10. A device regulator, characterized in that: The device includes a potentiometer as described in any one of claims 1 to 9, and a mounting plate; the mounting plate has a snap-fit ​​position in the middle of its surface and a positioning mounting hole penetrating the surface on its outer side; the center of the snap-fit ​​position is a clearance hole penetrating the surface, and a limiting strip surrounding the bottom of the potentiometer is provided outside the clearance hole; the snap-fit ​​position has buckles pointing towards the center on both sides, the lower part of the buckles is vertically fixed to the plate surface, and the upper end extends inward to limit the space of the potentiometer.

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