Contact structure for circuit breaker
By using the rotating shafts and corresponding contacts of multiple mounting chambers in the circuit breaker, combining the fixed shaft and elastic compressor, the problems of complex contact assembly and poor stability in the prior art are solved, and higher installation is achieved Stability and performance extend the service life.
Patent Information
- Application Number
- CN202420861243.3
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2024-04-24
- Publication Date
- 2024-12-20
- Estimated Expiration
- 2034-04-24
AI Technical Summary
The contacts of existing circuit breakers are complex in assembly, poor in stability, prone to deviation in the torsion spring stress, unreasonable overall structural design, and poor in use performance.
The rotation shafts of multiple mounting chambers and corresponding mating contacts are used to set up fixed shafts through the shaft center perforation and installation perforation, and combined with elastic compressors and limit recessed holes, the contacts are stablely installed and maintained, and prevent position deviation. The force is transferred through the contact between the second protrusion and the mounting cavity to avoid stress concentration.
It improves the fit and stability of the contacts and the rotating shaft, simplifies the assembly process, enhances the retention force, extends the service life, and ensures the rationality of structural design and optimization of performance.
Smart Images
Figure CN222214098U_ABST
Abstract
Description
Technical Field
[0001] The utility model relates to the technical field of circuit breakers, in particular to a contact structure for circuit breakers. Background Art
[0002] In existing molded case circuit breakers, the rotating shaft is usually provided with multiple contact installation cavities, and there are through-channels on the contact installation cavities, so that the contacts can pass through the through-channels after installation. As an important component in the circuit breaker, the ease of assembly of the contacts is crucial. The existing contacts are generally installed by setting connecting columns on both sides, assembling the connecting columns with the mounting holes on the rotating shaft, and then setting torsion springs to give the contacts a certain holding force. Most of the existing torsion springs are also set on both sides of the contacts, and the force is prone to deviation, resulting in poor stability between the contacts and the rotating shaft. The assembly of the torsion springs is also relatively complicated, the overall structural design is unreasonable, and the performance is poor. Utility Model Content
[0003] In view of the shortcomings of the prior art, the utility model aims to provide a contact structure for a circuit breaker which has a reasonable overall structure, is easy to assemble and has good performance.
[0004] The utility model adopts a technical solution to solve its technical problems. It is a contact structure for a circuit breaker, comprising a rotating shaft provided with a plurality of mounting cavities, and contacts corresponding to the mounting cavities. The plurality of mounting cavities are arranged at equal intervals along the axial direction and are provided with through openings at the bottom. The free ends of the corresponding contacts extend out of the through openings. The rotating shaft is also provided with an axial through hole. The mounting end of the contact is provided with a mounting through hole. The axial through hole and the mounting through hole are used to install a fixed shaft. The mounting cavity is also provided with a plurality of pairs of first limiting recessed holes on the wall surface on the lower side of the through hole. A first convex portion is also convexly provided on the lower side of the mounting end of the contact. A second limiting recessed hole corresponding to the first limiting recessed hole is provided on the first convex portion. An elastic compression member is connected between the first limiting recessed hole and the second limiting recessed hole.
[0005] The advantages of adopting the above technical solution are as follows: by respectively arranging an axial through hole and an installation through hole on the rotating shaft and the contact, the contact can be assembled on the rotating shaft in a string-fixed form by arranging a fixed shaft, the cooperation between the contact and the rotating shaft is more complete, and the stability of the contact installation is higher. The elastic compression member is limited by the first limiting recessed hole and the second limiting recessed hole. The operator drives the rotating shaft to rotate by turning the operating handle. Under the action of the fixed shaft, the elastic compression member located at the first limiting recessed hole and the second limiting recessed hole can drive the contact to rotate in the same direction, and the number of elastic compression members can also be set to multiple pairs. After the contact is string-fixed by the fixed shaft, while ensuring that the force on the rotating shaft and the contact is uniform, it can provide a better holding force for the contact. The contact structure for this circuit breaker is also convenient to assemble, has good performance, is reasonably designed as an overall structure, and has more stable operation.
[0006] Furthermore, the installation cavity is formed with a positioning recess on the wall surface at the lower side of the through-opening, and the positioning recess is communicated with the through-opening and matched with the first protrusion.
[0007] The advantages of adopting the above technical solution are as follows: by providing a positioning recess matched with the first protrusion, the contact can be prevented from being shifted to the left and right in the installation cavity during use, thereby ensuring the consistent spacing between the contacts and stable use effect.
[0008] Furthermore, a second convex portion is convexly provided on the upper side of the mounting end of the rotating shaft, and the upper surface of the second convex portion is configured as an outwardly convex arc surface to form a contact fit with the upper wall surface of the mounting cavity.
[0009] Advantages of the above technical solution: by setting the second protrusion in contact with the upper wall of the installation cavity, the force applied to the contact during the rotation of the rotating shaft can be effectively transferred, avoiding stress concentration at the connection between the contact and the rotating shaft, thereby extending the service life and making the structural design reasonable.
[0010] Furthermore, the first limiting concave hole is set as a rectangular concave hole or a circular concave hole, and the second limiting concave hole is set as an inverted isosceles trapezoidal concave hole.
[0011] The advantages of adopting the above technical solution are: the first limiting recess is set as a rectangular recess or a circular recess, so that the elastic compression component will not change its position in the first limiting recess; the second limiting recess is set as an inverted isosceles trapezoidal recess. When the rotating shaft rotates, the other end of the elastic compression component acts on the corresponding side bevel of the second limiting recess, so the elastic compression component will not be twisted and deformed, and the structural design is reasonable.
[0012] Furthermore, the contact includes a first contact and a second contact arranged on both sides of the first contact, the first protrusion is evenly divided into the corresponding first contact and the second contact, and a pair of the second limiting recessed holes is provided on each part of the evenly divided first protrusion.
[0013] The advantages of adopting the above technical solution are as follows: the contact is assembled from a first contact and two second contacts, which makes the contact easier to form, and a pair of second limiting recessed holes are provided on each part of the evenly divided first convex portion. Since the second limiting recessed holes are arranged corresponding to the first limiting recessed holes, the elastic compression member matched between the first limiting recessed holes and the second limiting recessed holes is distributed along the axial direction, and the effect of the elastic compression member is good.
[0014] Furthermore, a first plug-in through hole and a second plug-in through hole are formed on the first contact, and a plug-in column, a third plug-in through hole, and a fourth plug-in through hole are formed on the second contact. The plug-in column is plugged into and matched with the first plug-in through hole, and the third plug-in through hole is arranged concentrically with the second plug-in through hole.
[0015] The advantages of adopting the above technical solution are as follows: during installation, the plug-in column is plugged into the first plug-in through hole, and then the connecting frame is plugged into the second plug-in through hole, the third plug-in through hole, and the fourth plug-in through hole to prevent the first contact and the second contact from being separated. The assembly is convenient, and the assembled contacts have good use effect.
[0016] Furthermore, a third protrusion is provided on the upper side of the free end of the first contact, and an auxiliary protrusion matching the third protrusion is provided on the upper side of the free end of the second contact.
[0017] Advantages of the above technical solution: by forming the third protrusion on the upper side of the free end of the first contact and the auxiliary protrusion on the upper side of the free end of the second contact, stable cooperation with the external power connection plate is achieved while reducing the contact area. The heat generated by the power supply is not easy to cause the contacts to stick, and the use strength of the third protrusion is improved, making it safer to use. BRIEF DESCRIPTION OF THE DRAWINGS
[0018] Figure 1 It is a schematic diagram of the overall structure of the utility model;
[0019] Figure 2 It is a structural sectional view of the utility model;
[0020] Figure 3 This is a schematic diagram of the rotating shaft structure of the utility model;
[0021] Figure 4 Another view of the rotating shaft structure of the utility model;
[0022] Figure 5This is a schematic diagram of the first contact structure of the utility model;
[0023] Figure 6 A schematic diagram of the second contact structure of the utility model;
[0024] Figure 7 Another view of the second contact structure of the present invention.
[0025] In the figure: 1-rotating shaft, 2-installing cavity, 3-contact, 4-through opening, 5-axial through hole, 6-installing through hole, 7-fixing shaft, 8-first limiting recessed hole, 9-first convex part, 10-second limiting recessed hole, 11-elastic compression member, 12-positioning recessed part, 13-second convex part, 14-first contact, 15-second contact, 16-first plug-in through hole, 17-second plug-in through hole, 18-plug-in column, 19-third plug-in through hole, 20-fourth plug-in through hole, 21-third convex part, 22-auxiliary convex part. DETAILED DESCRIPTION
[0026] In order to more clearly illustrate the embodiments of the utility model and / or the technical solutions in the prior art, the specific implementation methods of the utility model will be described below with reference to the accompanying drawings. Obviously, the drawings described below are only some embodiments of the utility model. For ordinary technicians in this field, other drawings and other implementation methods can be obtained based on these drawings without creative work. In addition, the orientation only represents the relative position relationship between the components, not the absolute position relationship.
[0027] See also Figures 1 to 7 As shown, a contact structure for a circuit breaker includes a rotating shaft 1 provided with a plurality of mounting cavities 2, and contacts 3 corresponding to the mounting cavities 2. The plurality of mounting cavities 2 are arranged at equal intervals along the axial direction and are provided with through openings 4 at the bottom. The free ends of the corresponding contacts 3 extend out of the through openings 4. It should be noted that the number of the mounting cavities 2 and the number of the contacts 3 are both 3. An axial through hole 5 is also provided on the rotating shaft 1, and a mounting through hole 6 is provided on the mounting end of the contact 3. The axial through hole 5 and the mounting through hole 6 are used to install a fixed shaft 7. By respectively providing the axial through hole 5 and the mounting through hole 6 on the rotating shaft 1 and the contact 3, the fixed shaft 7 can be installed. The shaft 7 assembles the contact 3 on the rotating shaft 1 in the form of a string fixation, the contact 3 and the rotating shaft 1 cooperate more fully, and the contact 3 is installed with higher stability. A plurality of pairs of first limiting recessed holes 8 are also provided on the wall surface of the installation cavity 2 at the lower side of the through-opening 4. The first limiting recessed holes 8 are arranged side by side up and down. A first convex portion 9 is also convexly provided on the lower side of the installation end of the contact 3. A second limiting recessed hole 10 corresponding to the first limiting recessed hole 8 is provided on the first convex portion 9. An elastic compression member 11 is connected between the first limiting recessed hole 8 and the second limiting recessed hole 10. The elastic compression member 11 forms a position limitation through the first limiting recessed hole 8 and the second limiting recessed hole 10.
[0028] In the above embodiment, the elastic compression member 11 can be set as a spring. During installation, the elastic compression member 11 is first placed in the first limiting recessed hole 8. When the contact 3 is installed in the specified position (the center of the installation through hole 6 and the axis through hole 5 are located on the same straight line), the fixed shaft 7 is penetrated again. After the installation is completed, the elastic compression member 11 will form an elastic support for the first convex portion 9 in the second limiting recessed hole 10. During use, the operator drives the rotating shaft 1 to rotate by turning the operating handle. Due to the fixed shaft 7, the position of the contact 3 relative to the rotating shaft 1 will not change. The elastic compression member 11 located at the first limiting recessed hole 8 and the second limiting recessed hole 10 can drive the contact 3 to rotate in the same direction, and the number of the elastic compression members 11 is set to multiple pairs. While ensuring that the rotating shaft 1 and the contact 3 are subjected to uniform force, a better holding force can be provided for the contact 3. The contact structure of this circuit breaker is also convenient to assemble, has good performance, a reasonable overall structural design, and more stable operation.
[0029] In this embodiment, a positioning recess 12 is formed on the wall surface of the installation cavity 2 at the lower side of the through-opening 4. The positioning recess 12 is connected to the through-opening 4 and is matched with the first protrusion 9. In this way, the first protrusion 9 on the contact 3 after being installed in place will form a position limit with the positioning recess 12, so that during use, the purpose of preventing the contact 3 from being shifted to the left and right in the installation cavity 2 can be achieved, thereby ensuring that the spacing between the contacts 23 is consistent and the use effect is stable.
[0030] In this embodiment, a second protrusion 13 is further provided on the upper side of the mounting end of the rotating shaft 1, and the upper surface of the second protrusion 13 is set as an outwardly convex arc surface to form a contact fit with the upper wall surface of the mounting cavity 2. Through the setting of the contact fit between the second protrusion 13 and the upper wall surface of the mounting cavity 2, the force exerted on the contact 3 during the rotation of the rotating shaft 1 can be effectively transferred, thereby avoiding stress concentration at the connection between the contact 3 and the rotating shaft 1, thereby extending the service life and making the structural design reasonable.
[0031] In this embodiment, the first limiting recessed hole 8 is set as a rectangular recessed hole or a circular recessed hole, and the depth of the first limiting recessed hole 8 is more than 1 / 2 of the length of the elastic compression member 11. The second limiting recessed hole 10 is set as an inverted isosceles trapezoidal recessed hole. The first limiting recessed hole 8 is set as a rectangular recessed hole or a circular recessed hole, so that the elastic compression member will not change its position in the first limiting recessed hole. The second limiting recessed hole 10 is set as an inverted isosceles trapezoidal recess. When the rotating shaft 1 rotates, the other end of the elastic compression member 11 acts on the corresponding side bevel of the second limiting recessed hole 10, so that the elastic compression member 11 will not be twisted or deformed during the action, and the structural design is reasonable.
[0032] In this embodiment, the contact 3 includes a first contact 14 and a second contact 15 that is fitted on both sides of the first contact 14. The contact is assembled from a first contact 14 and two second contacts 15, so that the contact 3 is easier to form. The first protrusion 9 is evenly divided on the corresponding first contact 14 and the second contact 15, and each part of the evenly divided first protrusion 9 is provided with a pair of second limiting recessed holes 10, and the pair of second limiting recessed holes 10 are distributed up and down, that is, the second limiting recessed holes 10 are set to three pairs. Since the second limiting recessed holes 10 are arranged corresponding to the first limiting recessed holes 8, the number of pairs of the first limiting recessed holes 8 and the elastic compression member 11 is also three pairs. Therefore, the elastic compression member 11 matched between the first limiting recessed hole 8 and the second limiting recessed hole 10 is distributed along the axial direction, so that the elastic compression member 11 has a good effect.
[0033] In this embodiment, a first plug-in through hole 16 and a second plug-in through hole 17 are formed on the first contact 14, and a plug-in column 18, a third plug-in through hole 19, and a fourth plug-in through hole 20 are formed on the second contact 15. The plug-in column 18 is plug-matched with the first plug-in through hole 16, and the third plug-in hole 19 is co-centrically arranged with the second plug-in through hole 17. During installation, the plug-in column 18 is plug-matched with the first plug-in through hole 16, and then the connecting frame is matched with the second plug-in through hole 17, the third plug-in through hole 19, and the fourth plug-in through hole 20 to prevent the first contact 14 and the second contact 15 from being separated. The assembly is convenient, and the assembled contact 3 has a good use effect.
[0034] In this embodiment, a third protrusion 21 is provided on the upper side of the free end of the first contact 14, and an auxiliary protrusion 22 matching the third protrusion 21 is provided on the upper side of the free end of the second contact 15. By forming the third protrusion 21 on the upper side of the free end of the first contact 14 and the auxiliary protrusion 22 on the upper side of the free end of the second contact 15, stable cooperation with the external power connection sheet is achieved while reducing the contact area. The heat generated by the power supply is not easy to cause the contacts to stick, and the use strength of the third protrusion 21 is improved, making it safer to use.
[0035] The above contents are further detailed descriptions of the present invention in combination with specific preferred implementations, and the specific implementation of the present invention cannot be considered to be limited to these descriptions. For ordinary technicians in the technical field to which the present invention belongs, several simple deductions or substitutions can be made without departing from the concept of the present invention, which should be regarded as falling within the protection scope of the present invention.
Claims
1. A contact structure for a circuit breaker, comprising a rotating shaft (1) provided with a plurality of mounting cavities (2), and contacts (3) corresponding to the mounting cavities (2), wherein the plurality of mounting cavities (2) are arranged at equal intervals along the axial direction and each of the bottoms is provided with a through opening (4), and the free ends of the corresponding contacts (3) extend out of the through opening (4), characterized in that: The rotating shaft (1) is also provided with an axial through hole (5), and the mounting end of the contact (3) is provided with a mounting through hole (6). The axial through hole (5) and the mounting through hole (6) are used to mount a fixed shaft (7). The mounting cavity (2) is also provided with a plurality of pairs of first limiting recessed holes (8) on the wall surface on the lower side of the through opening (4). The lower side of the mounting end of the contact (3) is also provided with a first convex portion (9), and the first convex portion (9) is provided with a second limiting recessed hole (10) corresponding to the first limiting recessed hole (8), and an elastic compression member (11) is connected between the first limiting recessed hole (8) and the second limiting recessed hole (10).
2. A contact structure for a circuit breaker according to claim 1, characterized in that: The installation cavity (2) is formed with a positioning recess (12) on the wall surface at the lower side of the through-opening (4); the positioning recess (12) is connected to the through-opening (4) and is matched with the first protrusion (9).
3. A contact structure for a circuit breaker according to claim 1, characterized in that: A second convex portion (13) is also provided on the upper side of the mounting end of the rotating shaft (1), and the upper surface of the second convex portion (13) is configured as an outwardly convex arc surface to form a contact fit with the upper wall surface of the mounting cavity (2).
4. A contact structure for a circuit breaker according to claim 1, characterized in that: The first limiting recessed hole (8) is configured as a rectangular recessed hole or a circular recessed hole, and the second limiting recessed hole (10) is configured as an inverted isosceles trapezoidal recessed hole.
5. The contact structure for a circuit breaker according to any one of claims 1 to 4, characterized in that: The contact (3) comprises a first contact (14) and a second contact (15) arranged on both sides of the first contact (14); the first convex portion (9) is evenly divided on the corresponding first contact (14) and the second contact (15); and a pair of the second limiting recessed holes (10) are provided on each part of the evenly divided first convex portion (9).
6. A contact structure for a circuit breaker according to claim 5, characterized in that: The first contact (14) is formed with a first plug-in through hole (16) and a second plug-in through hole (17), and the second contact (15) is formed with a plug-in column (18), a third plug-in through hole (19), and a fourth plug-in through hole (20), the plug-in column (18) is plug-fitted with the first plug-in through hole (16), and the third plug-in through hole (19) is co-centrically arranged with the second plug-in through hole (17).
7. A contact structure for a circuit breaker according to claim 5, characterized in that: A third convex portion (21) is provided on the upper side of the free end of the first contact (14), and an auxiliary convex portion (22) matching the third convex portion (21) is provided on the upper side of the free end of the second contact (15).