A long-life, high-torque glass glaze rotary potentiometer

Abstract

The utility model discloses a long-life high-torque glass glaze rotary potentiometer, comprising a rotating shaft, a shell, an insulator, a reed and a resistor, the inner end of the rotating shaft is sleeved with an insulator, an axial gasket is provided between one end of the inner wall of the shell and one end of the insulator, the circumferential outer wall of the insulator is provided with an insulator annular groove and a radial silicone ring is sleeved in the insulator annular groove, the inner wall of the radial silicone ring is in close contact with the groove bottom of the insulator annular groove, and the outer wall of the radial silicone ring is in close contact with the circumferential inner wall of the shell. The utility model increases the rotational torque of the potentiometer by adding a radial silicone ring and utilizing the friction force generated by the radial silicone ring in the radial direction between the insulator and the shell, and the radial silicone ring basically does not produce fatigue due to being squeezed in the radial direction, and its radial elasticity basically does not decrease, so it is largely guaranteed that the rotational torque will not decrease too much during the rotation life of the potentiometer and can meet the application requirements of high torque.

Description

Technical Field

[0001] The utility model relates to a glass glaze rotary potentiometer, in particular to a glass glaze rotary potentiometer with a long service life and high torque. Background Art

[0002] With the development of product miniaturization and informatization, glass glaze rotary potentiometers are widely used in military aviation, civil electronic products and other fields due to their small size, wide resistance range, small resistance temperature coefficient, high temperature resistance and good moisture resistance of the resistance film surface.

[0003] like Figure 1 As shown, the traditional glass glaze rotary potentiometer includes a traditional shaft 9, a traditional housing 5, a traditional insulator 7, a traditional reed 6, a traditional resistor 4 and a traditional printed circuit board 3. The traditional shaft 9 passes through the corresponding through hole on the traditional housing 5. The inner end of the traditional shaft 9 is sleeved with a traditional insulator 7 that is tightly connected (preferably an integrated molding process between metal and plastic). The traditional reed 6 is installed on the traditional insulator 7. The traditional resistor 4 (the resistor body is ceramic, and the resistor band on the resistor body is made of glass glaze slurry) is installed on the inner wall of one end of the traditional housing 5. The traditional reed 6 contacts the resistor band of the traditional resistor 4. The traditional printed circuit board 3 is installed at one end of the traditional housing 5 and is electrically connected to the traditional resistor 4 through the printed line 12. An annular groove is provided on the inner wall of the traditional housing 5 on one side close to one end of the traditional insulator 7. An axial silicone ring 8 is installed in the shaped groove and the traditional rotating shaft 9 passes through the central through hole of the axial silicone ring 8. The circumferential outer wall of the position where the traditional rotating shaft 9 extends out of the traditional shell 5 is provided with an annular groove and a first gasket 10 and a first opening retaining ring 11 are installed in the annular groove. The first gasket 10 is blocked by the traditional shell 5 and cannot move toward the inner side of the traditional shell 5, so that the traditional insulator 7 has a pressure to press the axial silicone ring 8. The pressure can be adjusted by changing the thickness or number of the first gasket 10. The two sides of the axial silicone ring 8 are squeezed by one end of the traditional insulator 7 and the corresponding groove bottom of the traditional shell 5, and are subjected to pressure in the same direction as the axial direction of the traditional rotating shaft 9, generating friction. The friction determines the torque that drives the traditional rotating shaft 9 to rotate. The greater the pressure on the axial silicone ring 8, the greater the torque, and vice versa. Figure 1 Also shown are the conventional switch assembly 1 and the conventional clamp 2, both of which are conventional structures of the glass glaze rotary potentiometer. When working, the conventional rotating shaft 9 rotates to drive the conventional insulator 7 to rotate, thereby driving the conventional reed 6 to contact and slide on the resistance band of the conventional resistor 4, generating a changing electrical signal to be detected to realize the angular displacement detection function, or outputting a changing voltage signal to realize the function of controlling the output voltage size.

[0004] The above-mentioned traditional glass glaze rotary potentiometer has the following defects: when the axial silicone ring 8 is under a certain amount of compression, after the potentiometer rotates a certain number of times, the axial silicone ring 8 will become fatigued and its elasticity will decrease, causing the rotational torque of the potentiometer to drop rapidly. As a result, the rotation life of the potentiometer is very long, but the elastic life of the gasket that gives it a large torque is very short, which cannot meet application requirements.

[0005] For example, in the application of glass glaze rotary potentiometers, they are often required to have a larger torque (such as 200gf·cm~240gf·cm) and a longer rotational life (such as 12000 cycles). However, in actual applications, after the rotational life of the potentiometer reaches 1500 cycles, its rotational torque will drop rapidly (may only reach 80gf·cm) due to the reduction of the elastic life of the axial silicone ring 8. In the later period of most of the rotational life, the rotational torque of the potentiometer cannot meet the user's requirements. Utility Model Content

[0006] The purpose of the utility model is to provide a long-life high-torque glass glaze rotary potentiometer in order to solve the above problems.

[0007] The utility model achieves the above-mentioned purpose through the following technical solutions:

[0008] A long-life, high-torque glass glaze rotary potentiometer comprises a rotating shaft, a shell, an insulator, a reed and a resistor, wherein the rotating shaft passes through a corresponding through hole on the shell, the inner end of the rotating shaft is sleeved with the tightly connected insulator, the reed is mounted on the insulator, the resistor is mounted on the inner wall of one end of the shell, the reed contacts the resistor band of the resistor, an axial washer is arranged between one end of the inner wall of the shell and one end of the insulator, and the rotating shaft passes through the central through hole of the axial washer, the circumferential outer wall of the rotating shaft at the position where the rotating shaft extends out of the shell is provided with a rotating shaft annular groove, and a second washer and a second open retaining ring for pressing the insulator against the axial washer are installed in the rotating shaft annular groove, the circumferential outer wall of the insulator is provided with an insulator annular groove, and a radial silicone ring is sleeved in the insulator annular groove, the inner wall of the radial silicone ring is in close contact with the groove bottom of the insulator annular groove, and the outer wall of the radial silicone ring is in close contact with the circumferential inner wall of the shell.

[0009] Preferably, in order to further improve the high torque working life of the potentiometer, the axial washer is a stainless steel washer, and a corrugated washer is also installed between the axial washer and one end of the inner wall of the outer shell, the rotating shaft passes through the central through hole of the corrugated washer, and the corrugated washer and the axial washer are squeezed by one end of the insulator to be in close contact with one end of the inner wall of the outer shell.

[0010] Preferably, in order to achieve reliable elasticity of the corrugated washer, the corrugated washer is a thin-walled stainless steel washer.

[0011] Preferably, in order to further improve the durability of the rotational torque, the radial silicone ring is an O-shaped silicone ring, and there are two radial silicone rings arranged in parallel in the axial direction of the rotating shaft.

[0012] Preferably, in order to facilitate the adjustment of the pressure applied by the insulator to the axial gasket, the second gasket includes a plurality of thin metal gaskets arranged overlapping each other.

[0013] Preferably, in order to facilitate connection with other devices, a printed circuit board is installed at one end of the housing, and the printed circuit board is electrically connected to the resistor body accordingly.

[0014] The beneficial effects of the utility model are:

[0015] The utility model provides an insulator annular groove on the circumferential outer wall of the insulator and sleeves a radial silicone ring in the insulator annular groove, and utilizes the friction force generated by the radial silicone ring between the insulator and the shell in the radial direction to improve the rotational torque of the potentiometer. The radial silicone ring will basically not be fatigued due to being squeezed in the radial direction, and its radial elasticity will basically not be reduced, so it is guaranteed to a great extent that the rotational torque will not decrease too much within the rotational life of the potentiometer and can meet the application requirements of large torque; by adding a corrugated washer, the elastic life of the combination of the axial washer and the corrugated washer can be maintained for a longer time, further ensuring that the potentiometer has a sufficiently large rotational torque within a large number of rotations, and can well meet the application requirements. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] Figure 1 This is a schematic diagram of the main view cross-sectional structure of a traditional glass glaze rotary potentiometer;

[0017] Figure 2 It is a top view structural diagram of a traditional glass glaze rotary potentiometer;

[0018] Figure 3 This is a schematic diagram of the main view and partial cross-section structure of the long-life and high-torque glass glaze rotary potentiometer of the utility model;

[0019] Figure 4 It is a three-dimensional structural schematic diagram of the rotating shaft and the insulator of the long-life and high-torque glass glaze rotary potentiometer of the utility model. DETAILED DESCRIPTION

[0020] The utility model is further described below in conjunction with the accompanying drawings:

[0021] like Figure 3 and Figure 4As shown, the long-life high-torque glass glaze rotary potentiometer of the utility model comprises a rotating shaft 23, a housing 17, an insulator 18, a reed 21 and a resistor 16. The rotating shaft 23 passes through a corresponding through hole on the housing 17. The inner end of the rotating shaft 23 is sleeved with a tightly connected insulator 18. The connection method is preferably an integrated structure between metal and plastic. The reed 21 is mounted on the insulator 18. The resistor 16 is mounted on the inner wall of one end of the housing 17. The reed 21 contacts the resistance band of the resistor 16. An axial washer 20 is provided between one end of the inner wall of the housing 17 and one end of the insulator 18. The rotating shaft 23 passes through the central through hole of the axial gasket 20, and the circumferential outer wall of the position where the rotating shaft 23 extends out of the outer shell 17 is provided with a rotating shaft annular groove 26, and the second gasket 24 and the second open retaining ring 25 for pressing the insulator 18 against the axial gasket 20 are installed in the rotating shaft annular groove 26. The circumferential outer wall of the insulator 18 is provided with an insulator annular groove 27, and the insulator annular groove 27 is sleeved with a radial silicone ring 19, the inner wall of the radial silicone ring 19 is in close contact with the groove bottom of the insulator annular groove 27, and the outer wall of the radial silicone ring 19 is in close contact with the circumferential inner wall of the outer shell 17.

[0022] like Figure 3 and Figure 4 As shown, the utility model also discloses the following more optimized specific structures:

[0023] In order to further improve the high torque working life of the potentiometer, the axial washer 20 is a stainless steel washer, and a corrugated washer 22 is also installed between the axial washer 20 and one end of the inner wall of the outer shell 17. The rotating shaft 23 passes through the central through hole of the corrugated washer 22. The corrugated washer 22 and the axial washer 20 are squeezed by one end of the insulator 18 and are in close contact with one end of the inner wall of the outer shell 17.

[0024] In order to achieve reliable elasticity of the corrugated washer 22 , the corrugated washer 22 is a thin-walled stainless steel washer.

[0025] In order to further improve the durability of the rotational torque, the radial silicone ring 19 is an O-shaped silicone ring, and there are two radial silicone rings 19 arranged in parallel in the axial direction of the rotating shaft 23 .

[0026] In order to facilitate adjustment of the pressure applied by the insulator 18 to the axial washer 20, the second washer 24 includes a plurality of thin metal washers arranged overlapping each other and a thick metal washer.

[0027] In order to facilitate connection with other devices, a printed circuit board 15 is installed at one end of the housing 17 , and the printed circuit board 15 is electrically connected to the resistor 16 accordingly.

[0028] Figure 3 Also shown are the switch assembly 13 and the clamp 14 disposed on the housing 17, both of which are conventional structures.

[0029] like Figure 3 and Figure 4 As shown, when used, the rotating shaft 23 rotates under the rotation of the detected equipment component or manual rotation drive, driving the insulator 18 to rotate, thereby driving the reed 21 to contact and slide on the working belt of the resistor 16, generating a changing electrical signal to be detected to realize the angular displacement detection function, or outputting a changing voltage signal to realize the function of controlling the output voltage size. During this process, both sides of the axial gasket 20 are squeezed by one end of the insulator 18 and the corresponding end of the inner wall of the shell 17, and are subjected to pressure in the same direction as the axial direction of the rotating shaft 23. When the rotating shaft 23 rotates, a friction force F1 in the opposite direction of the turning torque is generated. At the same time, the radial silicone ring 19 is squeezed between the groove bottom of the annular groove 27 of the insulator and the circumferential inner wall of the shell 17, and is subjected to pressure in the same direction as the radial direction of the rotating shaft 23. When the rotating shaft 23 rotates, a friction force F2 in the opposite direction of the turning torque is generated. The friction force F1 and the friction force F2 jointly determine the magnitude of the turning torque driving the rotating shaft 23 to rotate. The greater the comprehensive friction force, the greater the turning torque, and vice versa. The above-mentioned friction force F2 remains basically unchanged for a long time, so it is fundamentally guaranteed that the comprehensive friction force will not be too small, and can meet the application requirements of larger torque for a long time. The friction force F1 will have a longer life due to the presence of the corrugated gasket 22, so it can meet the application requirements of large torque for a long time.

[0030] Note: The above-mentioned rotating shaft 23, housing 17, insulator 18, reed 21, resistor 16, printed circuit board 15, switch assembly 13, clamp 14, axial washer 20, second washer 24, and second open retaining ring 25 respectively correspond to the traditional rotating shaft 9, traditional housing 5, traditional insulator 7, traditional reed 6, traditional resistor 4, traditional printed circuit board 3, traditional switch assembly 1, traditional clamp 2, axial silicone ring 8, first washer 10, and first open retaining ring 11 in the background technology content and have the same functions, but because the structure of the insulator 18 has changed and components have been added, other components will undergo adaptive changes, so different component names and marking numbers are used.

[0031] The above embodiments are only preferred embodiments of the present utility model and are not limitations on the technical solutions of the present utility model. Any technical solution that can be implemented on the basis of the above embodiments without creative work should be deemed to fall within the scope of protection of the patent of the present utility model.

Claims

1. A long-life high-torque glass glaze rotary potentiometer, comprising a rotating shaft, a shell, an insulator, a reed and a resistor, wherein the rotating shaft passes through a corresponding through hole on the shell, the inner end of the rotating shaft is sleeved with the tightly connected insulator, the reed is mounted on the insulator, the resistor is mounted on the inner wall of one end of the shell, the reed contacts the resistor band of the resistor, an axial washer is arranged between one end of the inner wall of the shell and one end of the insulator, and the rotating shaft passes through the central through hole of the axial washer, the circumferential outer wall of the rotating shaft extending out of the shell is provided with a rotating shaft annular groove, and a second washer and a second open retaining ring for pressing the insulator against the axial washer are installed in the rotating shaft annular groove, characterized in that: The circumferential outer wall of the insulator is provided with an insulator annular groove and a radial silicone ring is sleeved in the insulator annular groove, the inner wall of the radial silicone ring is in close contact with the groove bottom of the insulator annular groove, and the outer wall of the radial silicone ring is in close contact with the circumferential inner wall of the shell.

2. The long-life high-torque glass glaze rotary potentiometer according to claim 1 is characterized in that: The axial washer is a stainless steel washer, and a corrugated washer is installed between the axial washer and one end of the inner wall of the outer shell. The rotating shaft passes through the central through hole of the corrugated washer. The corrugated washer and the axial washer are squeezed by one end of the insulator to be in close contact with one end of the inner wall of the outer shell.

3. The long-life high-torque glass glaze rotary potentiometer according to claim 2, characterized in that: The wave washer is a thin-walled stainless steel washer.

4. The long-life high-torque glass glaze rotary potentiometer according to claim 1 or 2, characterized in that: The radial silicone ring is an O-shaped silicone ring, and there are two radial silicone rings arranged in parallel in the axial direction of the rotating shaft.

5. The long-life high-torque glass glaze rotary potentiometer according to claim 1 or 2, characterized in that: The second gasket includes a plurality of thin metal gaskets which are arranged overlapping each other.

6. The long-life high-torque glass glaze rotary potentiometer according to claim 1 or 2, characterized in that: A printed circuit board is installed at one end of the shell, and the printed circuit board is electrically connected to the resistor body accordingly.

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