CN113345669A

CN113345669A - High-precision potentiometer

Info

Publication number: CN113345669A
Application number: CN202110582270.8A
Authority: CN
Inventors: 刘峰铄
Original assignee: Individual
Current assignee: Shaanxi Hongxing Electronic Components Co ltd
Priority date: 2021-05-27
Filing date: 2021-05-27
Publication date: 2021-09-03
Anticipated expiration: 2041-05-27
Also published as: CN113345669B

Abstract

The invention relates to the technical field of electrical elements and discloses a high-precision potentiometer, wherein a first resistance sheet with two ends respectively fixedly connected with A, B soldering lugs is fixedly arranged on an outer ring at the bottom of an inner cavity of a shell, a supporting pad is movably arranged at the position, located at the inner ring of the first resistance sheet, at the bottom of the inner cavity of the shell, a rotating shaft extending out of the top of the shell is fixedly connected to the middle of the top of the supporting pad, the outer ring of the supporting pad extends in a convex shape, a second resistance sheet is fixedly arranged at the top of the outer ring of the supporting pad, first rolling contacts are symmetrically and movably connected to two ends of the second resistance sheet, a rotating sleeve is movably sleeved on the outer ring at the top of the rotating shaft, a rotating rod is fixedly connected to the outer ring of the rotating sleeve, a second rolling contact is movably sleeved on the outer end part of the rotating rod, the contact between the resistance sheets is in a rolling contact manner, two resistance sheets are arranged in the potentiometer for accurately adjusting resistance, and the service life of the potentiometer is longer, The potential adjustment is more accurate.

Description

High-precision potentiometer

Technical Field

The invention relates to the technical field of electrical components, in particular to a high-precision potentiometer.

Background

The potentiometer is an electrical element which is similar to the function of a variable rheostat, and can be provided with an adjusting sliding sheet between two pins through three pins, so that different resistance value changes can be realized between AB and AC when a rotating shaft is rotated, the potentiometer has the function of obtaining output voltage which has a certain relation with input voltage (external voltage), and the potentiometer is simple in structural principle and wide in application, but has certain problems:

1. conductive parts in the potentiometer are a resistance card and a rotating slip sheet, the resistance card is a thin carbon film, so that the resistance card is quickly worn out after friction to cause short service life, a pressure resisting force is also applied to the resistance card on the movable arm 17, the carbon film is rubbed into fine powder due to large abrasion, the condition of adhesion is easy to occur, the potential is inaccurate, and the use in a normal electric appliance circuit is not facilitated;

2. the potentiometer adopts a sliding sheet to rub on a resistor sheet, so that the contact area is large, the sum of the resistances actually divided into AC and BC may not be the total resistance between AB, and the required resistance value needs to be adjusted in the condition is difficult, namely, the precise resistance adjustment cannot be achieved, and the use in a precise circuit is not facilitated.

Disclosure of Invention

Aiming at the defects of the background technology, the invention provides the high-precision potentiometer, which has the advantages of long service life and high adjustment precision and solves the problems in the background technology.

The invention provides the following technical scheme: a high-precision potentiometer comprises a shell, wherein A, B, C three soldering lugs are fixedly arranged on the front surface of the shell, the outer ring at the bottom of the inner cavity of the shell is fixedly provided with a first resistance sheet, two ends of the first resistance sheet are respectively and fixedly connected with the A, B soldering lug, a supporting pad is movably arranged at the bottom of the inner cavity of the shell and positioned at the inner ring of the first resistance card, a rotating shaft extending to the top of the shell is fixedly connected in the middle of the top of the supporting pad, the outer ring of the supporting pad is extended in a convex shape, a second resistance sheet is fixedly arranged at the top of the outer ring, two ends of the second resistance sheet are symmetrically and movably connected with first rolling contacts, the outer ring of the end part of the first rolling contact is contacted with the top surface of the first resistance card, the outer ring of the top part of the rotating shaft is movably sleeved with a rotating sleeve, the outer ring of the rotating sleeve is fixedly connected with a rotating rod, and the outer end part of the rotating rod is movably sleeved with a second rolling contact.

Preferably, the middle movable mounting at casing top has the inner circle and changes the fixed support bearing who cup joints of cover, the inner circle movable mounting of second rolling contact has the rolling bearing that inner circle and dwang end fixing cup jointed, the dwang is close to the middle part of second rolling contact one end and has seted up the trepanning, the contact head has been cup jointed in the inner activity of trepanning, fixedly connected with insulating spring between contact head and the trepanning, the inside fixed mounting of dwang has one end to stretch into the inside electrically conductive connecting rod of trepanning, electrically conductive connecting rod is located the tip fixedly connected with in the trepanning and the contact of contact head, the outside of contact head is passed through line connection and is in compression state on the C soldering lug and insulating spring all the time.

Preferably, the first rolling contact and the second rolling contact have the same structure and different sizes, and the heights of the inner rings of the first resistance sheet and the second resistance sheet are higher than the heights of the outer rings.

Preferably, the resistance value of the first resistance sheet between the two first rolling contacts is equal to the total resistance value of the second resistance sheet, and the mutual rotation between the rotating shaft and the rotating sleeve is in complementary interference.

The invention has the following beneficial effects:

1. through changing the contact gleitbretter into rolling contact, and be the tilt state with the resistance card design top, compare in prior art, utilize rolling contact to replace the contact gleitbretter at first can reduce the degree of wear, avoided scraping the upper surface of resistance card when adjusting, and the contact area of gleitbretter is too big to lead to its actually switched on resistance and required resistance to have certain discrepancy, it is not accurate enough, the top surface of resistance card designs into the shape that one side is high low can increase the contact point with rolling contact, its contact is line contact, can not occupy the area on resistance card surface, this kind of inclined plane can also play the clearance friction and fall the electrically conductive granule that falls simultaneously, avoid it to stop the error influence when causing the adjustment on the resistance card surface, the life and the contact accuracy of potentiometre have improved on the whole.

2. Through set up two resistance cards in the potentiometre inside to set up two rolling contact and the resistance card contact of outer lane on the resistance card of inner circle, compare in prior art, utilize inside second resistance card with the resistance regulation that outside first resistance card is located between two rolling contact enlargies, adjust the rolling contact on the second resistance card through changeing the cover and realize the fine tuning, the pivot coarse adjustment before the cooperation has realized the circuit accurate regulation to a point location, has guaranteed that can more convenient high accuracy uses in the practical application.

Drawings

FIG. 1 is an overall transverse half-sectional view of the structure of the present invention;

FIG. 2 is an overall longitudinal half-sectional view of the structure of the present invention;

FIG. 3 is a schematic view of the internal structure of the present invention;

FIG. 4 is an enlarged view of FIG. 2 at D;

fig. 5 is a schematic diagram of a conventional potentiometer structure.

In the figure: 1. a housing; 2. soldering lugs; 3. a first resistor sheet; 4. a support pad; 5. a second resistor sheet; 6. a first rolling contact; 7. a rotating shaft; 8. rotating the sleeve; 9. rotating the rod; 901. trepanning; 10. a second rolling contact; 11. a support bearing; 12. a conductive connecting rod; 13. connecting a power head; 14. a contact tip; 15. an insulating spring; 16. a rotating bearing; 17. a movable arm.

Detailed Description

The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.

Referring to fig. 1-5, a high-precision potentiometer comprises a housing 1, A, B, C three soldering lugs 2 are fixedly mounted on the front surface of the housing 1, a first resistance lug 3 with two ends respectively fixedly connected with A, B soldering lugs 2 is fixedly mounted on an outer ring at the bottom of an inner cavity of the housing 1, a supporting pad 4 is movably mounted at the inner ring position of the first resistance lug 3 at the bottom of the inner cavity of the housing 1, a rotating shaft 7 extending to the top of the housing 1 is fixedly connected to the middle of the top of the supporting pad 4, the outer ring of the supporting pad 4 extends in a convex shape, a second resistance lug 5 is fixedly mounted on the top of the outer ring, first rolling contacts 6 are symmetrically and movably connected to two ends of the second resistance lug 5, the outer ring at the end part of each first rolling contact 6 is in contact with the top surface of the first resistance lug 3, a rotating sleeve 8 is movably sleeved on the outer ring at the top of the rotating shaft 7, a supporting bearing 11 with an inner ring fixedly sleeved on the rotating sleeve 8 is movably mounted in the middle of the top of the housing 1, the rotating sleeve 8 is connected through a supporting bearing 11, so that the rotating sleeve 8 can be conveniently fixed in the middle of the shell 1 to rotate, the outer ring of the rotating sleeve 8 is fixedly connected with a rotating rod 9, the outer end part of the rotating rod 9 is movably sleeved with a second rolling contact 10, the inner ring of the second rolling contact 10 is movably provided with a rotating bearing 16, the inner ring of the rotating bearing is fixedly sleeved with the end part of the rotating rod 9, the middle part of one end, close to the second rolling contact 10, of the rotating rod 9 is provided with a sleeve hole 901, the inner end of the sleeve hole 901 is movably sleeved with a contact head 14, an insulating spring 15 is fixedly connected between the contact head 14 and the sleeve hole 901, the inner part of the rotating rod 9 is fixedly provided with a conductive connecting rod 12, one end of the conductive connecting rod 12 is extended into the sleeve hole 901, the end part, positioned in the sleeve hole 901, of the conductive connecting rod 12 is fixedly connected with an electrical contact head 13 in contact with the contact head 14, the outer side of the contact head 14 is connected to the C welding sheet 2 through a circuit, and the insulating spring 15 is always in a compressed state, the insulating spring 15 is pressed on the contact head 14 to keep the contact head connected with the power connection head 13 all the time, so that the smoothness of a circuit is ensured.

The first rolling contact 6 and the second rolling contact 10 have the same structure and different sizes, the height of the inner ring of the first resistance sheet 3 and the height of the inner ring of the second resistance sheet 5 are higher than that of the outer ring, the electric conduction is realized through the contact between the rolling contacts and the resistance sheets, and when the resistance value is adjusted, the rolling contacts can be driven to rotate to adjust the resistance value only by rotating the rotating shaft 7 or the rotating sleeve 8, the surface friction of the resistance sheets is not directly generated, the friction loss of the resistance sheets is greatly reduced, and the resistance value adjustment is not influenced by the fact that a large number of resistance particles are rubbed out due to the rolling contact mode.

The resistance value of the first resistance sheet 3 between the two first rolling contacts 6 is equal to the total resistance value of the second resistance sheet 5, mutual rotation complementary interference between the rotating shaft 7 and the rotating sleeve 8 is realized, the resistance value on the first resistance sheet 3 is adjusted through rotation of the rotating shaft 7, then the resistance on the second resistance sheet 5 is adjusted through rotation of the rotating sleeve 8, and therefore fine resistance adjustment is performed after the resistance is roughly adjusted, the adjusted resistance value is more accurate, meanwhile, resistance value adjustment with smaller amplitude can be performed, and the second resistance sheet 5 can be regarded as fine resistance adjustment or an amplification effect.

The operating principle is that A, B, C soldering lugs 2 are connected with circuits respectively, conduction of switch-on and switch-off currents is achieved through an AB line and an AC line, when adjustment and distribution of resistance values between the AB line and the AB line are needed, a rotating shaft 7 is rotated to drive a supporting pad 4 to rotate, the supporting pad 4 drives a second resistance sheet 5 and a first rolling contact 6 connected with the second resistance sheet 5 to roll along the top surface of the first resistance sheet 3, the rotating shaft 7 stops rotating after the approximate resistance value is adjusted, then a rotating sleeve 8 is rotated to drive a rotating rod 9 to rotate, the rotating rod 9 drives a second rolling contact 10 to roll along the surface of the second resistance sheet 5, the rotating sleeve 8 stops rotating after the needed resistance value is adjusted to complete the adjustment process, the rolling contact always keeps a power connection head 13 and a contact head 14 to be abutted against each other when the rolling contact head rolls along the top surface of the resistance sheet, and resistance conductive particles falling from the top surface of the outer ring of the resistance sheet or the outer ring of the rolling contact can slide down to the bottom of a shell along with the top inclined surface of the resistance sheet without shadow In response to subsequent potential adjustments.

It is noted that, herein, relational terms such as first and second, and the like may be used solely to distinguish one entity or action from another entity or action without necessarily requiring or implying any actual such relationship or order between such entities or actions. Also, the terms "comprises," "comprising," or any other variation thereof, are intended to cover a non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements does not include only those elements but may include other elements not expressly listed or inherent to such process, method, article, or apparatus.

Although embodiments of the present invention have been shown and described, it will be appreciated by those skilled in the art that changes, modifications, substitutions and alterations can be made in these embodiments without departing from the principles and spirit of the invention, the scope of which is defined in the appended claims and their equivalents.

Claims

1. The utility model provides a high accuracy potentiometre, includes casing (1), and the front fixed mounting of casing (1) has A, B, C three soldering lug (2), its characterized in that: the outer ring fixed mounting of casing (1) inner chamber bottom has both ends respectively with A, B soldering lug (2) fixed connection's first resistance card (3), casing (1) inner chamber bottom is located first resistance card (3) inner circle department movable mounting and has supporting pad (4), the centre fixedly connected with at supporting pad (4) top stretches out pivot (7) at casing (1) top, the outer lane of supporting pad (4) is the extension of lug form and at its top fixed mounting have second resistance card (5), the both ends symmetry swing joint of second resistance card (5) has first rolling contact (6), the tip outer lane of first rolling contact (6) and the top surface contact of first resistance card (3), the top outer lane activity of pivot (7) has cup jointed changes cover (8), the outer lane fixedly connected with dwang (9) of commentaries on classics cover (8), and a second rolling contact (10) is movably sleeved at the outer end part of the rotating rod (9).

2. A high precision potentiometer according to claim 1, wherein: a supporting bearing (11) fixedly sleeved with an inner ring and a rotating sleeve (8) is movably arranged in the middle of the top of the shell (1), the inner ring of the second rolling contact (10) is movably provided with a rotating bearing (16) of which the inner ring is fixedly sleeved with the end part of the rotating rod (9), a trepan boring (901) is arranged in the middle of one end of the rotating rod (9) close to the second rolling contact (10), the inner end of the trepanning (901) is movably sleeved with a contact head (14), an insulating spring (15) is fixedly connected between the contact head (14) and the trepanning (901), a conductive connecting rod (12) with one end extending into the trepanning (901) is fixedly arranged in the rotating rod (9), the end part of the conductive connecting rod (12) positioned in the sleeve hole (901) is fixedly connected with an electric connecting head (13) contacted with the electric contact head (14), the outer side of the contact head (14) is connected to the C welding sheet (2) through a circuit, and the insulating spring (15) is always in a compressed state.

3. A high precision potentiometer according to claim 1, wherein: the first rolling contact (6) and the second rolling contact (10) are identical in structure, different in size, and the height of the inner ring of the first resistance sheet (3) and the height of the second resistance sheet (5) are higher than that of the outer ring.

4. A high precision potentiometer according to claim 1, wherein: the resistance value of the first resistance sheet (3) between the two first rolling contacts (6) is equal to the total resistance value of the second resistance sheet (5), and mutual rotation complementary interference between the rotating shaft (7) and the rotating sleeve (8) is realized.