CN116798791A - Connecting row for heat dissipation of molded case circuit breaker and heat dissipation structure of molded case circuit breaker - Google Patents
Connecting row for heat dissipation of molded case circuit breaker and heat dissipation structure of molded case circuit breaker Download PDFInfo
- Publication number
- CN116798791A CN116798791A CN202210264415.4A CN202210264415A CN116798791A CN 116798791 A CN116798791 A CN 116798791A CN 202210264415 A CN202210264415 A CN 202210264415A CN 116798791 A CN116798791 A CN 116798791A
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- CN
- China
- Prior art keywords
- circuit breaker
- heat dissipation
- connecting part
- molded case
- case circuit
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Pending
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- 230000017525 heat dissipation Effects 0.000 title claims description 58
- 230000003068 static effect Effects 0.000 claims abstract description 8
- 230000005855 radiation Effects 0.000 claims abstract description 6
- 239000004020 conductor Substances 0.000 claims description 8
- 238000010586 diagram Methods 0.000 description 7
- 230000007547 defect Effects 0.000 description 5
- 230000032683 aging Effects 0.000 description 3
- 230000005405 multipole Effects 0.000 description 3
- 238000010438 heat treatment Methods 0.000 description 2
- 238000009434 installation Methods 0.000 description 2
- 238000009413 insulation Methods 0.000 description 2
- 230000002411 adverse Effects 0.000 description 1
- 238000001816 cooling Methods 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 230000003647 oxidation Effects 0.000 description 1
- 238000007254 oxidation reaction Methods 0.000 description 1
- 238000006467 substitution reaction Methods 0.000 description 1
Classifications
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01H—ELECTRIC SWITCHES; RELAYS; SELECTORS; EMERGENCY PROTECTIVE DEVICES
- H01H9/00—Details of switching devices, not covered by groups H01H1/00 - H01H7/00
- H01H9/52—Cooling of switch parts
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01H—ELECTRIC SWITCHES; RELAYS; SELECTORS; EMERGENCY PROTECTIVE DEVICES
- H01H71/00—Details of the protective switches or relays covered by groups H01H73/00 - H01H83/00
- H01H71/02—Housings; Casings; Bases; Mountings
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01H—ELECTRIC SWITCHES; RELAYS; SELECTORS; EMERGENCY PROTECTIVE DEVICES
- H01H73/00—Protective overload circuit-breaking switches in which excess current opens the contacts by automatic release of mechanical energy stored by previous operation of a hand reset mechanism
- H01H73/02—Details
- H01H73/04—Contacts
Landscapes
- Breakers (AREA)
Abstract
A be used for radiating connection row of moulded case circuit breaker which characterized in that: the circuit breaker comprises an inner connecting part (1) and an outer radiating part (2), wherein the inner connecting part (1) is arranged in an inner cavity (3 a) of a shell (3) of the circuit breaker and is connected with an adjacent pole moving contact (5) and/or an adjacent pole static contact (4), and the outer radiating part (2) is connected with the inner connecting part (1) and is arranged outside the inner cavity (3 a) of the shell (3) of the circuit breaker. The heat radiation structure is connected with the adjacent pole moving contact and/or the adjacent pole static contact in the inner cavity of the circuit breaker through the inner connecting part, and the heat is led out to the outer heat radiation part outside the inner cavity of the shell through the inner connecting part, so that the temperature rise of the existing short circuit row arranged in the inner cavity of the shell of the circuit breaker is greatly reduced, and the space occupied when the heat radiation device of the existing external short circuit row is completely arranged outside the range of the shell of the circuit breaker is greatly reduced.
Description
Technical Field
The invention belongs to the technical field of molded case circuit breakers, and particularly relates to a connecting row for heat dissipation of a molded case circuit breaker and a heat dissipation structure of the molded case circuit breaker, which can effectively reduce the temperature rise of the circuit breaker.
Background
The circuit breaker is classified into a high voltage circuit breaker and a low voltage circuit breaker according to its range of use. The low-voltage circuit breaker is also called an automatic switch, commonly called an air switch, and is an electric appliance which has the function of manual switch and can automatically perform voltage loss, undervoltage, overload and short-circuit protection. It can be used for distributing electric energy, not frequently starting asynchronous motor, protecting power supply circuit and motor, when they are in serious overload or short circuit and undervoltage, they can automatically cut off circuit, and after breaking fault current, it generally does not need to change parts, so that it has been extensively used.
In order to improve the direct current breaking capacity, the existing direct current breaker adopts a multi-break-point wiring mode, namely, two poles or more poles of the multi-pole breaker are connected in series or two poles or more poles of the multi-pole breaker are connected in parallel. Usually external wiring, i.e. series or parallel connection, is made at the terminals of the multipole circuit breaker. However, the wiring often does not reach a prescribed length, resulting in excessive surface temperature of the connection rows. The excessively high temperature not only can cause misoperation of the circuit breaker, but also can bring electrical potential safety hazards to product use, such as adverse situations of advanced ageing of insulating parts, accelerated oxidation of contact points and the like, so that the common external connection row cannot meet the requirements.
The conventional thinking in the art is to add a heat sink to the external connection row or to change to an internal connection.
Chinese patent CN208157334U discloses a molded case circuit breaker with heat dissipation function, which comprises a circuit breaker body and a heat dissipation device; the heat dissipation device is fixedly connected to the wiring terminal outside the circuit breaker shell through bolts and comprises a heat dissipation row and at least one heat dissipation fin, and the heat dissipation fin is arranged on the heat dissipation row side by side in a comb shape. According to the technical scheme, the purpose of reducing the temperature of the circuit breaker can be achieved by simply changing the connection relation between the cooling component structure and the circuit breaker, and the whole product is simple in structure and reliable in performance. But the heat radiation structure of the circuit breaker is only suitable for an external short circuit row structure on a wiring terminal outside the circuit breaker shell, so that the radiator is completely out of the shell range and is overlarge beyond the shell range, and the space occupied by a product is increased.
The multi-break direct current circuit breaker is increasingly adopted in the prior art by connecting a conductor in series with a moving contact of an adjacent pole or a fixed contact of an adjacent pole in the shell. For example, chinese patent CN102456515B discloses a multi-break circuit breaker, in which two adjacent groups of moving contacts are connected by a conductor in an insulating housing by a preset connection mode, so as to form a pole with at least two break points connected in series and having the same polarity or phase. A plurality of breakpoints are connected in series in the circuit breaker shell, and a user does not need to wire at a wiring terminal for connecting the breakpoints in series. The long delay characteristic is also set in the preset wiring mode, and the action characteristic of the wire is not affected when the wire is used by a user. The short circuit is arranged inside the shell of the circuit breaker, and the temperature rise performance requirement index of the circuit breaker is generally not considered, so that a heat dissipation device is not required to be arranged.
Disclosure of Invention
The invention aims at overcoming the defects that in the existing molded case circuit breaker, when a short circuit is arranged in a shell, the short circuit is heated to a large extent, so that the temperature rise in the shell of the circuit breaker is high, insulation aging is easy to accelerate, contact points are oxidized in an accelerating way and the like.
Technical proposal
In order to achieve the technical purpose, the invention provides a connection row for heat dissipation of a molded case circuit breaker, which is characterized in that: the circuit breaker comprises an inner connecting part and an outer radiating part, wherein the inner connecting part is arranged in the inner cavity of the shell of the circuit breaker and is connected with the adjacent pole moving contact and/or the adjacent pole fixed contact, and the outer radiating part is connected with the inner connecting part and is arranged outside the inner cavity of the shell of the circuit breaker.
Further, the external heat sink is located outside the interior cavity of the housing of the circuit breaker while being within the housing of the circuit breaker.
Further, the inner connection portion is a hard conductor.
Further, the inner connecting part and the outer radiating part are integrated or combined.
Further, all or part of the radiating surface of the outer radiating part is provided with radiating fins or radiating grooves or radiating holes.
The invention also provides a heat radiation structure of the molded case circuit breaker, which comprises a shell and a contact system, wherein the contact system is positioned in the inner cavity of the shell, and is characterized in that: the movable contacts of at least one group of adjacent poles in the contact system are connected through the inner connecting part and/or the fixed contacts of at least one group of adjacent poles in the contact system are connected through the inner connecting part, so that the two poles are connected into one pole with the same polarity or the same phase.
Further, the base and the cover enclose an interior cavity of a housing of the circuit breaker.
Further, the moving contacts of at least one group of adjacent poles in the contact system are connected in series through the inner connecting part or the fixed contacts of at least one group of adjacent poles in the contact system are connected in series through the inner connecting part, so that the two poles are connected in series to form one pole with the same polarity or the same phase.
Further, the moving contacts of at least one group of adjacent poles in the contact system are connected in series through an inner connecting part, and the fixed contacts of at least one group of adjacent poles corresponding to the moving contacts of at least one group of adjacent poles in the contact system are connected in series through an inner connecting part, and the moving contacts of one group of adjacent poles connected in series and the fixed contacts of a group of adjacent poles connected in series are connected in parallel, so that the two poles are connected in parallel to form one pole with the same polarity or the same phase.
Further, when the two poles are connected in parallel to form one pole with the same polarity or the same phase, one part of the outer heat dissipation part of the inner connection part is used for heat dissipation, and the other part is used for wiring.
Advantageous effects
According to the connecting row for heat dissipation of the molded case circuit breaker and the heat dissipation structure of the molded case circuit breaker, provided by the invention, the technical defect that the temperature rise in the shell is higher when the short circuit row is arranged in the shell is overcome by aiming at the technical defect that the prior art generally considers that the heat in the shell does not need to be dissipated when the conductor is used for connecting the moving contact of the adjacent pole or the static contact of the adjacent pole in series in the shell, the connecting part is connected with the heating part in the inner cavity of the circuit breaker, and the heat in the inner cavity is led out of the shell through the connecting part, so that the temperature rise when the prior short circuit row is arranged in the inner cavity of the circuit breaker is greatly reduced, and meanwhile, the space outside the range of the shell of the circuit breaker is not occupied.
Drawings
Fig. 1 is a schematic perspective view of a molded case circuit breaker according to embodiment 1 of the present invention.
Fig. 2a is a schematic diagram showing the installation of a connection row in embodiment 1 of the present invention.
Fig. 2b is a second schematic diagram of the connection row installation in embodiment 1 of the present invention.
Fig. 2c is a schematic diagram of the wiring connection of embodiment 1 of the present invention.
Fig. 3 is a schematic view of a connection row in embodiment 1 of the present invention.
Fig. 4 is a schematic diagram of the series connection of the static contacts in embodiment 1 of the present invention.
Fig. 5 is a schematic diagram of the series connection of the moving contacts in embodiment 2 of the present invention.
Fig. 6 is a schematic diagram of the series connection of the static contacts when two adjacent poles are connected in parallel in embodiment 3 of the present invention.
Fig. 7 is a schematic diagram of the series connection of the moving contacts when two adjacent poles are connected in parallel in embodiment 3 of the present invention.
Detailed Description
The following description of the embodiments of the present invention will be made apparent and fully in view of the accompanying drawings, in which some, but not all embodiments of the invention are shown. All other embodiments, which can be made by those skilled in the art based on the embodiments of the invention without making any inventive effort, are intended to be within the scope of the invention.
In the description of the present invention, it should be noted that the directions or positional relationships indicated by the terms "inner", "outer", "front", "rear", "left", "right", "general side", "standby side", etc. are based on the directions or positional relationships shown in the drawings, are merely for convenience of describing the present invention and simplifying the description, and do not indicate or imply that the devices or elements referred to must have a specific direction, be configured and operated in the specific direction, and thus should not be construed as limiting the present invention. Furthermore, the terms "first," "second," and "third" are used for descriptive purposes only and are not to be construed as indicating or implying relative importance.
In the description of the present invention, it should be noted that, unless explicitly specified and limited otherwise, the terms "mounted", "connected" and "connected" are to be construed broadly, and may be, for example, fixedly connected, detachably connected or integrally connected; can be mechanically or electrically connected; can be directly connected or indirectly connected through an intermediate medium, and can be communication between two elements. The specific meaning of the above terms in the present invention will be understood in specific cases by those of ordinary skill in the art.
The invention will now be described in further detail with reference to specific examples thereof in connection with the accompanying drawings.
Example 1
In the conventional molded case circuit breaker, when the shorting bar is disposed inside the case (specifically, in the inner cavity 3a of the case 3 of the circuit breaker enclosed by the base 6 and the cover 7), the temperature rise inside the case is generally considered in the art to not affect the performance of the circuit breaker, and therefore, when the shorting bar is disposed inside the case, a heat dissipating device is generally not provided. When the shorting bar is arranged outside the housing (i.e. outside the cavity 3a, including the part outside the cavity 3a and within the range of the circuit breaker housing and the part outside the range of the circuit breaker housing, the outside of the housing where the connecting terminal is located in the embodiment is outside the cavity 3a and within the range of the circuit breaker housing, even if the temperature rise at the fixed contact and/or the moving contact and the connecting terminal is considered to be higher, insulation aging is easy to accelerate, only the heat dissipating device is arranged outside the range of the circuit breaker housing, but in practice the heat dissipating device outside the range of the circuit breaker housing greatly increases the space occupied by the circuit breaker. In order to solve the above technical problems, as shown in fig. 1 and 2a,2b, and 2c, the present embodiment provides a heat dissipation structure of a molded case circuit breaker, which includes a housing 3 and a contact system 8, and a base 6 and a cover 7 enclose an inner cavity 3a of the housing 3 of the circuit breaker. The contact system 8 is located in the inner cavity 3a of the housing 3, and the heat dissipation structure further includes a connection row, as shown in fig. 3, where the connection row includes an inner connection portion 1 and an outer heat dissipation portion 2, the inner connection portion 1 is disposed in the inner cavity 3a of the housing 3 of the circuit breaker to connect the adjacent pole static contact 4, and the outer heat dissipation portion 2 is connected with the inner connection portion 1 and disposed outside the inner cavity 3a of the housing 3 of the circuit breaker. In this embodiment, the external heat sink 2 is located outside the inner cavity 3a of the housing 3 of the circuit breaker and is also within the housing 3 of the circuit breaker. The inner connection 1 is preferably a hard conductor. The inner connecting part 1 and the heat dissipation part 2 are integrated or combined.
The fixed contacts 4 of at least one group of adjacent poles in the contact system 8 are connected through the inner connecting part 1, so that the two poles are connected into one pole with the same polarity or the same phase. Specifically, in this embodiment, as shown in fig. 4, the stationary contacts 4 of at least one group of adjacent poles in the contact system are connected in series through the inner connection part 1, so that the two poles are connected in series to form one pole with the same polarity or the same phase. The heat dissipation surface of the outer heat dissipation part 2 is preferably provided with heat dissipation fins 9 or heat dissipation grooves or heat dissipation holes in whole or in part. In this embodiment, two adjacent poles are connected in series in the inner cavity 3a to form one pole, and the external heat dissipation part 2 does not need to be used as a connecting terminal to be connected with an external lead, so the external heat dissipation part 2 in this embodiment is provided with heat dissipation fins 9.
Meanwhile, the external heat dissipation part 2 can also exceed the range of the shell, and as part of the external heat dissipation part 2 is in the range of the shell 3 of the circuit breaker, the space occupied by the radiator is necessarily smaller when the radiator is totally out of the range of the shell than when the radiator is added on an external connecting row in the prior art.
Example 2
The movable contacts 5 of at least one group of adjacent poles in the contact system 8 are connected through the inner connecting part 1, so that the two poles are connected into one pole with the same polarity or the same phase. Specifically, in this embodiment, as shown in fig. 5, the moving contacts 5 of at least one group of adjacent poles in the contact system 8 are connected in series through the inner connection portion 1, so that the two poles are connected in series to form one pole with the same polarity or the same phase. The inner connecting part 1 is arranged in an inner cavity 3a of a shell 3 of the circuit breaker to connect adjacent pole moving contacts 5. The heat dissipation surface of the outer heat dissipation part 2 is preferably provided with heat dissipation fins 9 or heat dissipation grooves or heat dissipation holes in whole or in part. In this embodiment, two adjacent poles are connected in series in the inner cavity 3a to form one pole, and the external heat dissipation part 2 does not need to be used as a connecting terminal to be connected with an external lead, so the external heat dissipation part 2 in this embodiment is provided with heat dissipation fins 9. Other structures are the same as those of embodiment 1 and will not be described in further detail herein.
Example 3
In this embodiment, as shown in fig. 6 and fig. 7, the moving contacts 5 of at least one group of adjacent poles in the contact system are connected in series through the inner connecting portion 1, and the fixed contacts 4 of at least one group of adjacent poles as shown in fig. 6 corresponding to the moving contacts 5 of at least one group of adjacent poles in the contact system are connected in series through the inner connecting portion 1, the moving contacts 5 of one group of adjacent poles connected in series and the fixed contacts 4 of one group of adjacent poles connected in series form the two poles in parallel, and the inner connecting portion 1 is placed in the inner cavity 3a of the housing 3 of the circuit breaker, so that the two poles are connected in parallel into one pole with the same polarity or phase. As shown in fig. 6 and 7, in the present embodiment, a part of the outer heat dissipation parts 2 on the adjacent two poles is provided with a heat dissipation fin 9 for dissipating heat, and the other part is not provided with a heat dissipation fin 9 as a connection terminal 10 for connecting with an external conductor. Other structures are the same as those of embodiment 1 and will not be described in further detail herein.
According to the connecting row for heat dissipation of the molded case circuit breaker and the heat dissipation structure of the molded case circuit breaker, provided by the invention, the technical defect that the temperature rise in the shell is higher when the short circuit row is arranged in the shell is overcome by aiming at the technical defect that the prior art generally considers that the heat in the shell does not need to be dissipated when the conductor is used for connecting the moving contact of the adjacent pole or the static contact of the adjacent pole in series in the shell, the connecting part is connected with the heating part in the inner cavity of the circuit breaker, and the heat in the inner cavity is led out of the shell through the connecting part, so that the temperature rise when the prior short circuit row is arranged in the inner cavity of the circuit breaker is greatly reduced, and meanwhile, the space outside the range of the shell of the circuit breaker is not occupied.
Finally, it should be noted that: the above embodiments are only for illustrating the technical solution of the present invention, and not for limiting the same; although the invention has been described in detail with reference to the foregoing embodiments, those of ordinary skill in the art will appreciate that; the technical scheme described in the foregoing embodiments can be modified or some or all of the technical features thereof can be replaced by equivalents; such modifications and substitutions do not depart from the spirit of the invention.
Claims (10)
1. A be used for radiating connection row of moulded case circuit breaker which characterized in that: the circuit breaker comprises an inner connecting part (1) and an outer radiating part (2), wherein the inner connecting part (1) is arranged in an inner cavity (3 a) of a shell (3) of the circuit breaker and is connected with an adjacent pole moving contact (5) and/or an adjacent pole static contact (4), and the outer radiating part (2) is connected with the inner connecting part (1) and is arranged outside the inner cavity (3 a) of the shell (3) of the circuit breaker.
2. A connection block for heat dissipation of molded case circuit breaker as recited in claim 1, wherein: the outer heat dissipation part (2) is located outside an inner cavity (3 a) of a housing (3) of the circuit breaker and is located within the range of the housing (3) of the circuit breaker.
3. A connection block for heat dissipation of molded case circuit breaker as recited in claim 1, wherein: the inner connecting part (1) is a hard conductor.
4. A connection block for heat dissipation of molded case circuit breaker as recited in claim 1, wherein: the inner connecting part (1) and the outer radiating part (2) are integrated or combined.
5. A connection block for heat dissipation of molded case circuit breaker as recited in claim 1, wherein: all or part of the radiating surface of the outer radiating part (2) is provided with radiating fins (9) or radiating grooves or radiating holes.
6. The utility model provides a heat radiation structure of moulded case circuit breaker, it includes casing (3) and contact system, contact system is located in casing (3) inner chamber (3 a), its characterized in that: the connecting row according to any one of the preceding claims 1 to 5, wherein the movable contacts (5) of at least one group of adjacent poles in the contact system (8) are connected by means of an internal connection (1) and/or the stationary contacts (4) of at least one group of adjacent poles in the contact system (8) are connected by means of an internal connection (1) such that the two poles are connected to form one pole of the same polarity or phase.
7. The heat dissipation structure of a molded case circuit breaker as recited in claim 6, wherein: the base (6) and the cover (7) enclose an inner cavity (3 a) of the housing (3) of the circuit breaker.
8. The heat dissipation structure of a molded case circuit breaker as recited in claim 6, wherein: the movable contacts (5) of at least one group of adjacent poles in the contact system (8) are connected in series through the inner connecting part (1) or the fixed contacts (4) of at least one group of adjacent poles in the contact system (8) are connected in series through the inner connecting part (1), so that the two poles are connected in series to form one pole with the same polarity or the same phase.
9. The heat dissipation structure of a molded case circuit breaker as recited in claim 6, wherein: the movable contacts (5) of at least one group of adjacent poles in the contact system (8) are connected in series through the inner connecting part (1), and the fixed contacts (4) of at least one group of adjacent poles corresponding to the movable contacts (5) of at least one group of adjacent poles in the contact system (8) are connected in series through the inner connecting part (1), so that the two poles are connected in parallel to form one pole with the same polarity or phase.
10. The heat dissipation structure of a molded case circuit breaker as recited in claim 9, wherein: when the two poles are connected in parallel to form one pole with the same polarity or the same phase, one part of the outer heat dissipation part (2) of the inner connection part (1) is used for heat dissipation, and the other part is used for wiring.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202210264415.4A CN116798791A (en) | 2022-03-17 | 2022-03-17 | Connecting row for heat dissipation of molded case circuit breaker and heat dissipation structure of molded case circuit breaker |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202210264415.4A CN116798791A (en) | 2022-03-17 | 2022-03-17 | Connecting row for heat dissipation of molded case circuit breaker and heat dissipation structure of molded case circuit breaker |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN116798791A true CN116798791A (en) | 2023-09-22 |
Family
ID=88044338
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202210264415.4A Pending CN116798791A (en) | 2022-03-17 | 2022-03-17 | Connecting row for heat dissipation of molded case circuit breaker and heat dissipation structure of molded case circuit breaker |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN116798791A (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN117995594A (en) * | 2024-04-03 | 2024-05-07 | 瑞睿电气(浙江)有限公司 | Direct-current high-voltage circuit breaker |
-
2022
- 2022-03-17 CN CN202210264415.4A patent/CN116798791A/en active Pending
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN117995594A (en) * | 2024-04-03 | 2024-05-07 | 瑞睿电气(浙江)有限公司 | Direct-current high-voltage circuit breaker |
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