Static contact of molded case circuit breaker
By adding removable conductive blocks and heat dissipation blocks on the static contacts, using copper-clad aluminum and copper materials, the heat dissipation grooves are used to improve the heat dissipation effect, solving the problems of high-temperature welding and high material costs of static contacts, and achieving a reduction in temperature , reduce costs and facilitate maintenance.
Patent Information
- Application Number
- CN202420541201.1
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2024-03-20
- Publication Date
- 2024-12-10
- Estimated Expiration
- 2034-03-20
AI Technical Summary
Traditional static contacts are easily welded to death in high temperature environments, resulting in inability to break, and increasing the copper cross-sectional area of the heat dissipation terminals will increase weight and manufacturing costs.
A static contact including a removable conductive block and a heat dissipation block is designed. Both the conductive block and the heat dissipation block are equipped with heat dissipation grooves. The materials are copper-clad aluminum and copper, and the heat dissipation block is pure aluminum to improve the heat dissipation effect and reduce the cost.
It effectively reduces the temperature of the static spring terminals, avoids welding problems, and reduces material costs and weight, improving maintenance convenience.
Smart Images
Figure CN222146121U_ABST
Abstract
Description
Technical Field
[0001] The utility model relates to the technical field of stationary contacts, in particular to a stationary contact of a molded case circuit breaker. Background Art
[0002] A molded case circuit breaker is a switch device that can close, carry and disconnect current under normal circuit conditions and can close, carry and disconnect current under abnormal conditions within a specified time. Circuit breakers can be used to distribute electrical energy, start asynchronous motors infrequently, and protect power lines and motors. When they are seriously overloaded or short-circuited, undervoltage or other faults, they can automatically cut off the circuit. Its function is equivalent to the combination of a fuse-type switch and an over-underheating relay. The static contact is an important component of the circuit breaker. As the core component of the low-voltage switchgear, the contact plays the role of breaking and conducting. Its performance directly affects the quality and service life of the circuit breaker. When the circuit breaker is in operation, a large current passes through the static contact, causing it to overheat. The moving contact will be welded to the static contact. When an emergency occurs, the circuit breaker cannot be disconnected. In order to solve the problem of excessive temperature of the static contact, the copper cross-sectional area of the static spring terminal is usually increased. However, the weight and manufacturing cost of the static spring terminal will be greatly increased. Therefore, the applicant has made a beneficial design and found a solution to the above problem. The technical solution to be introduced below is produced under this background. Summary of the invention
[0003] The purpose of the utility model is to overcome the shortcomings of the above-mentioned traditional static contact design and provide a product that improves heat dissipation effect, reduces manufacturing costs and is easy to maintain.
[0004] To solve the above problems, the utility model adopts the following technical solutions.
[0005] A static contact of a molded case circuit breaker comprises a static spring terminal, one end of which is provided with a detachable conductive block, the conductive block is provided with a static contact, one end of which is provided with a detachable heat dissipation block, and the side of the heat dissipation block is provided with a plurality of heat dissipation grooves.
[0006] Preferably, the static spring terminal includes a first connecting portion, a bending portion, and a second connecting portion, and the first connecting portion, the bending portion, and the second connecting portion are connected and formed in sequence, and first threaded holes are provided on both sides of the first connecting portion, and a second threaded hole is provided on the second connecting portion.
[0007] Preferably, the conductive block is arranged on the top of the first connecting portion, the conductive block is provided with a first mounting hole and is located on the same center line as the first threaded hole, and the first mounting hole is provided with a screw and is engaged and connected with the first threaded hole.
[0008] Preferably, the heat sink block is arranged at the bottom of the second connecting portion, the heat sink block is provided with a second mounting hole and is located on the same center line as the second threaded hole, and the second mounting hole is provided with a screw and is engaged and connected with the second threaded hole.
[0009] Preferably, the material of the static spring terminal is set to copper-clad aluminum material, the width range of the static spring terminal is set to 22 to 54 mm, and the thickness range of the static spring terminal is set to 3 to 16 mm.
[0010] Preferably, the material of the conductive block is set to copper, the width range of the conductive block is set to 10-54 mm, and the thickness range of the conductive block is set to 3-10 mm.
[0011] Preferably, the heat dissipation block is made of pure aluminum.
[0012] Beneficial effects:
[0013] Compared with the prior art, the beneficial effects of the utility model are:
[0014] (1) The utility model increases the heat dissipation area by means of the heat dissipation grooves and realizes heat exchange by means of the flow of air through the heat dissipation grooves, thereby reducing the temperature of the static spring terminal and effectively controlling the temperature rise of the static spring terminal when the relay is running. The temperature rise can be controlled to ≤50K, thereby preventing the moving contact from being welded to the static contact and causing the situation that the disconnection cannot occur, and thus the product has the advantage of improving the heat dissipation effect.
[0015] (2) The utility model reduces material cost, weight, processing difficulty and facilitates transportation by selecting copper-clad aluminum as the material of the static spring terminal under the same size. Since the conductivity of copper-clad aluminum is 62.9% of pure copper, the material of the conductive block is set to copper, thereby ensuring that the instantaneous overcurrent capacity under the same conditions is guaranteed while the conductivity of the static spring terminal is reduced. In addition, the conductive block also increases the heat dissipation area, thereby ensuring that the static spring terminal can quickly dissipate heat after an instantaneous overcurrent, so that the product has the advantage of reducing manufacturing costs.
[0016] (3) In the present invention, when the conductive block, the static contact, or the heat sink are damaged, the conductive block and the heat sink can be removed in a detachable manner for easy replacement, thereby avoiding overall replacement, improving resource utilization, and making the product easy to maintain. BRIEF DESCRIPTION OF THE DRAWINGS
[0017] Figure 1 This is a structural schematic diagram of a stationary contact of a molded case circuit breaker of the utility model;
[0018] Figure 2 It is an exploded view of a static contact of a molded case circuit breaker of the utility model;
[0019] The corresponding relationship between the illustrations and component names in the figure is as follows:
[0020] Figure numerals: 1. static spring terminal; 2. conductive block; 3. static contact; 4. heat dissipation block; 5. screw; 11. first connecting portion; 12. bending portion; 13. second connecting portion; 14. first threaded hole; 15. second threaded hole; 21. first mounting hole; 41. heat dissipation groove; 42. second mounting hole. DETAILED DESCRIPTION
[0021] The technical solution of the utility model will be clearly and completely described below in conjunction with the embodiments. Obviously, the described embodiments are part of the embodiments of the utility model, not all of the embodiments. Based on the embodiments of the utility model, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the utility model.
[0022] In the description of the present invention, it is necessary to understand that the directions or positional relationships indicated by the terms "up", "down", "left" and "right" are based on the directions or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific direction, be constructed and operated in a specific direction, and therefore cannot be understood as a limitation on the present invention.
[0023] Reference example Figure 1 , 2 A static contact of a molded case circuit breaker comprises a static spring terminal 1, a detachable conductive block 2 is provided at one end of the static spring terminal 1, a static contact 3 is provided at the conductive block 2, a detachable heat sink 4 is provided at one end of the static spring terminal 1, a plurality of heat sink grooves 41 are provided on the side of the heat sink 4, the heat sink groove 41 increases the heat sink area, and heat exchange is achieved by the flow of air to the heat sink groove 41, so as to reduce the temperature of the static spring terminal 1, effectively control the temperature rise of the static spring terminal 1 when the molded case relay is running, and control the temperature rise to ≤50K, so as to avoid the welding of the moving contact to the static contact 3, resulting in the situation that the disconnection cannot occur;
[0024] It is worth mentioning that the static spring terminal 1 includes a first connection portion 11, a bending portion 12, and a second connection portion 13. The first connection portion 11, the bending portion 12, and the second connection portion 13 are connected in sequence, and first threaded holes 14 are provided on both sides of the first connection portion 11, and the second connection portion 13 is provided with a second threaded hole 15. The first connection portion 11 is used in conjunction with the conductive block 2, and the bending portion 12 forms a height difference between the first connection portion 11 and the second connection portion 13, which is convenient for installation in the base cavity of the molded case circuit breaker. The first threaded hole 14 and the second threaded hole 15 are used in conjunction with the screw 5;
[0025] It is worth mentioning that the conductive block 2 is arranged on the top of the first connecting portion 11, and the conductive block 2 is provided with a first mounting hole 21, and is on the same center line as the first threaded hole 14, the first mounting hole 21 is provided with a screw 5, and is engaged with the first threaded hole 14, the first mounting hole 21 is used in conjunction with the first threaded hole 14, and the conductive block 2 is fixed to the first connecting portion 11 by the screw 5;
[0026] It is worth mentioning that the heat sink 4 is arranged at the bottom of the second connection part 13, and the heat sink 4 is provided with a second mounting hole 42, and is located on the same center line as the second threaded hole 15, and the second mounting hole 42 is provided with a screw 5, and is engaged with the second threaded hole 15, and the second mounting hole 42 is used in conjunction with the second threaded hole 15, and the heat sink 4 is fixed to the second connection part 13 by the screw 5;
[0027] It is worth mentioning that the material of the static spring terminal 1 is set to copper-clad aluminum, the width range of the static spring terminal 1 is set to 22 to 54 mm, and the thickness range of the static spring terminal 1 is set to 3 to 16 mm. The copper-clad aluminum material has the effect of reducing material cost, weight, processing difficulty, and facilitating transportation under the same size;
[0028] It is worth mentioning that the material of the conductive block 2 is set to copper, the width range of the conductive block 2 is set to 10-54 mm, and the thickness range of the conductive block 2 is set to 3-10 mm. The copper ensures that the static spring terminal 1 has an instantaneous overcurrent capacity under the same conditions while the conductivity decreases. In addition, the conductive block 2 also increases the heat dissipation area, thereby ensuring that the static spring terminal 1 can quickly dissipate heat after an instantaneous overcurrent.
[0029] It is worth mentioning that the material of the heat sink 4 is set to be pure aluminum. Pure aluminum has the advantages of low manufacturing cost, good thermal conductivity, and good heat dissipation performance, thereby reducing the cost of a single heat sink 4. When the conductive block 2, the static contact 3, and the heat sink 4 are damaged, the conductive block 2 and the heat sink 4 can be removed in a detachable manner for easy replacement, thereby avoiding overall replacement and improving resource utilization, which has the advantage of easy maintenance.
[0030] When the width of the static spring terminal 1 is 22-54 mm and the thickness is 3-16 mm, and the width of the conductive block 2 is 10-54 mm and the thickness is 3-10 mm, then the rated current is 250A-1600A, the breaking capacity is 10KA-50KA, and the short-time withstand current is 5KA-20KA.
[0031] The above design scheme can enable the product to achieve the advantages of improving heat dissipation effect, reducing manufacturing costs and facilitating maintenance.
[0032] The above content is a further detailed description of the utility model in combination with specific implementation methods. It cannot be determined that the specific implementation of the utility model is limited to these descriptions. For ordinary technicians in the technical field to which the utility model belongs, without departing from the concept of the utility model, they can also make several simple deductions or substitutions, which should be regarded as belonging to the scope of protection determined by the claims submitted for the utility model.
Claims
1. A static contact of a molded case circuit breaker, characterized in that: The invention comprises a static spring terminal (1), one end of which is provided with a detachable conductive block (2), the conductive block (2) being provided with a static contact (3), one end of which is provided with a detachable heat dissipation block (4), and a side surface of the heat dissipation block (4) being provided with a plurality of heat dissipation grooves (41).
2. The static contact of the molded case circuit breaker according to claim 1, characterized in that: The static spring terminal (1) comprises a first connecting portion (11), a bending portion (12), and a second connecting portion (13); the first connecting portion (11), the bending portion (12), and the second connecting portion (13) are connected and formed in sequence; first threaded holes (14) are provided on both sides of the first connecting portion (11), and a second threaded hole (15) is provided on the second connecting portion (13).
3. The static contact of the molded case circuit breaker according to claim 2, characterized in that: The conductive block (2) is arranged on the top of the first connecting portion (11), and the conductive block (2) is provided with a first mounting hole (21) and is located on the same center line as the first threaded hole (14). The first mounting hole (21) is provided with a screw (5) and is engaged with the first threaded hole (14).
4. The static contact of the molded case circuit breaker according to claim 3, characterized in that: The heat dissipation block (4) is arranged at the bottom of the second connecting portion (13), and the heat dissipation block (4) is provided with a second mounting hole (42) and is located on the same center line as the second threaded hole (15). The second mounting hole (42) is provided with a screw (5) and is engaged with the second threaded hole (15).
5. The static contact of the molded case circuit breaker according to claim 1, characterized in that: The material of the static spring terminal (1) is set to copper-clad aluminum, the width range of the static spring terminal (1) is set to 22 to 54 mm, and the thickness range of the static spring terminal (1) is set to 3 to 16 mm.
6. The static contact of the molded case circuit breaker according to claim 1, characterized in that: The material of the conductive block (2) is set to copper, the width range of the conductive block (2) is set to 10 to 54 mm, and the thickness range of the conductive block (2) is set to 3 to 10 mm.
7. The static contact of the molded case circuit breaker according to claim 1, characterized in that: The material of the heat dissipation block (4) is set to be pure aluminum.