A sealed potentiometer structure with switch

Abstract

The invention provides a sealed potentiometer structure with a switch, which includes a shaft handle, a shaft sleeve, a resistance adjustment device and a switch device. The surface is provided with a resistor body and riveted with terminals, and the sealed housing has an installation cavity, and a brush assembly is arranged in the installation cavity, and the end surface of the sealed housing is provided with an embedding groove for embedding terminals; The switch seat body has at least two sets of switch contact pieces on the inner bottom surface, and a cylindrical disk is also provided in the accommodating sink cavity, and the bottom surface of the cylindrical disk is provided with a brush body that contacts the switch contact pieces. The elongated groove has a spring in the elongated groove, and the other end of the spring elastically abuts against the outer peripheral wall of the cylindrical disk through the ball, and the outer peripheral surface of the cylindrical disk also has a protruding M-shaped stopper. The potentiometer has good sealing performance, simple structure, strong stability and long service life.

Description

technical field [0001] The invention relates to the technical field of potentiometers, in particular to a structure of a sealed rotary potentiometer with a switch. Background technique [0002] The structure of traditional rotary potentiometers with switches usually includes shaft handles, shaft sleeves, resistance adjustment devices and switch devices assembled in sequence. These potentiometers are divided into large, small and miniature in size, and the switch devices include Torsion spring rotary type, toggle head rotary type and other structures. [0003] Publication number CN107316725A Chinese Invention Patent Publication Document discloses a potentiometer, in which the switch structure is a torsion spring rotary type, and the switch of this type of torsion spring structure is turned on and off by relying on the torsion spring to cross the critical point. However, there are inaccurate problems. For example, when adjusting the volume of the sound near the critical point...

AI Technical Summary

Problems solved by technology

[0003] Publication number CN107316725A Chinese Invention Patent Publication Document discloses a potentiometer, in which the switch structure is a torsion spring rotary type, and the switch of this type of torsion spring structure is turned on and off by relying on the torsion spring to cross the critical point. However, there are inaccurate problems. For example, when adjusting the volume of the sound near the critical point of the switch, it is easy to cause the torsion spring to cross the critical point and the sound is turned off. For electronic products with more and more functions (such as the input of the sound source and The outputs are all wireless connections, and you need to reconnect after restarting), this kind of mistaken shutdown will bring a lot of inconvenience to the use

The Chinese invention patent with the patent number of 200920304216.1 discloses a switch structure, the switch structure is the toggle head rotary type, the principle is to drive the toggle through the rotating shaft, and the toggle makes the switch movable shrapnel come into contact with the switch static contact piece Or disconnect, so as to achieve the switch function; but the restoring force of this structure is only provided by the bent switch dynamic shrapnel, and the switch dynamic shrapnel is prone to fatigue after long-term repeated use, which makes the contact between the switch dynamic shrapnel and the switch static contact piece poor, Thus, the service life of the potentiometer is shortened; and since the switch movable shrapnel and the switch static contact piece are both laterally embedded in the switch base, the two cannot be continuously stamped and formed by the same material belt, and it is necessary to manually separate each other during the production process. The independent switch moving shrapnel and the switch static contact piece are respectively embedded in the switch base sideways and then fixed, so the sealing, structural stability, precision and production efficiency are not good.

Because of the above-mentioned problems, although the structure of the toggle rotary switch is simpler in part structure and assembly than the structure of the torsion spring rotary switch, it requires higher potential for sealing, precision, and structural stability. Toggle head rotary switch structure is rarely used in the device

[0004] In addition, for small potentiometers, due to volume limitations, the substrate of the resistance adjustment device is usually packaged in the base, not only can be made smaller in size, but also has good sealing and waterproof performance, but the materials and molds required for this structure The cost is high; in large potentiometers, the structure of the resistance adjustment device usually includes a substrate, a brush assembly, and a metal shell made of a sheet wound around the outer periphery of the brush assembly. The metal shell is only used for Positioning and fixing, the cost of materials and molds for this kind of potentiometer structure is low, but there is no sealing and waterproof performance, so the use environment is often limited; in addition, most of the resistors on the substrate are carbon films, which have poor moisture resistance. The unsealed potentiometer structure makes the resistor body easy to contact with external substances, which affects the performance and life of the potentiometer. Although this type of potentiometer has high resolution, good wear resistance, and low cost, it has a longer service life due to unsealed Short, limited usage scenarios

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