CN220856439U - DC protector and electric automobile - Google Patents
DC protector and electric automobile Download PDFInfo
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- CN220856439U CN220856439U CN202321933087.9U CN202321933087U CN220856439U CN 220856439 U CN220856439 U CN 220856439U CN 202321933087 U CN202321933087 U CN 202321933087U CN 220856439 U CN220856439 U CN 220856439U
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- housing
- protector
- movable contact
- stationary contact
- magnet
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- 230000001012 protector Effects 0.000 title claims abstract description 47
- 230000005291 magnetic effect Effects 0.000 claims abstract description 24
- 230000006698 induction Effects 0.000 claims abstract description 9
- 239000003302 ferromagnetic material Substances 0.000 claims description 13
- 238000010438 heat treatment Methods 0.000 claims description 10
- 238000010891 electric arc Methods 0.000 description 4
- 239000002184 metal Substances 0.000 description 4
- 229910052751 metal Inorganic materials 0.000 description 4
- 239000000463 material Substances 0.000 description 3
- 238000010586 diagram Methods 0.000 description 2
- 230000000694 effects Effects 0.000 description 2
- 150000002739 metals Chemical class 0.000 description 2
- 238000000034 method Methods 0.000 description 2
- 230000002411 adverse Effects 0.000 description 1
- 238000013475 authorization Methods 0.000 description 1
- 230000008033 biological extinction Effects 0.000 description 1
- 238000010276 construction Methods 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 238000012423 maintenance Methods 0.000 description 1
- 238000004519 manufacturing process Methods 0.000 description 1
- 230000002035 prolonged effect Effects 0.000 description 1
- 230000003252 repetitive effect Effects 0.000 description 1
- 125000006850 spacer group Chemical group 0.000 description 1
- 229910001220 stainless steel Inorganic materials 0.000 description 1
- 239000010935 stainless steel Substances 0.000 description 1
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Abstract
The present disclosure relates to a direct current protector and an electric automobile. Disclosed is a direct current protector, characterized in that the direct current protector includes: a housing; a movable contact, a stationary contact, and a magnet disposed within the housing, wherein the magnet is disposed adjacent to the stationary contact such that a direction of a magnetic induction line of a magnetic field generated between the movable contact and the stationary contact is different from a moving direction of the movable contact.
Description
Technical Field
The utility model relates to the field of electric automobiles. In particular, the present utility model relates to a direct current protector, and an electric vehicle including the same.
Background
In electric vehicles, a dc protector is required to achieve overcurrent protection. Specifically, when the current flowing through the dc protector is excessive, the dc protector may be automatically turned off to achieve overcurrent protection. The direct current protector can be realized by a fixed contact and a movable contact which can be opened automatically.
However, when the movable contact is opened, an arc tends to be generated between the stationary contact and the movable contact. Such arcing can affect not only the life of the contacts, but also the safety of the dc protector. It is therefore desirable that the arc be extinguished as soon as possible.
In the current dc protector of an electric vehicle, an arc generated mainly by separating a stationary contact and a movable contact by a certain distance is automatically extinguished. However, with the rapid development of electric vehicles, the voltage levels used therewith increase, as do the levels of possible overload voltages through the dc-protector. In the case where the overload voltage is high, even if the stationary contact and the movable contact are separated by a certain distance, the generated arc is difficult to be automatically extinguished in a short time. In this way, the contacts are forced to withstand a larger arc for a longer period of time, which seriously affects the durability of the contacts, greatly reducing the working life of the dc protector.
Thus, there is a need for new technologies.
Disclosure of utility model
It is an object of the present disclosure to provide a dc protector.
According to an aspect of the present utility model, there is provided a direct current protector including: a housing; a movable contact, a stationary contact, and a magnet disposed within the housing, wherein the magnet is disposed adjacent to the stationary contact such that a direction of a magnetic induction line of a magnetic field generated between the movable contact and the stationary contact is different from a moving direction of the movable contact.
According to at least one embodiment of the present utility model, the magnet may be arranged such that a magnetic induction line direction of a magnetic field generated between the movable contact and the stationary contact is perpendicular to a moving direction of the movable contact.
According to at least one embodiment of the present utility model, the magnet may be disposed at a side of the stationary contact opposite to the movable contact.
According to at least one embodiment of the present utility model, the housing may include a first cavity and a second cavity separated by an intermediate plate, and the movable contact and the stationary contact are disposed in the first cavity, and the magnet is disposed in the second cavity.
According to at least one embodiment of the utility model, the intermediate plate may be composed of a non-ferromagnetic material.
According to at least one embodiment of the utility model, at least a portion of the housing may be comprised of a ferromagnetic material.
According to at least one embodiment of the present utility model, a heating element may be disposed within the housing, and the movable contact may be coupled to the housing via a bimetallic disk.
According to at least one embodiment of the present utility model, the housing may include a first portion, a second portion, and a third portion that are electrically conductive, and the bimetal disc may be coupled to the first portion of the housing.
According to at least one embodiment of the present utility model, the intermediate plate may include conductive first and second portions, the first and second portions of the intermediate plate may be coupled to the second and third portions of the housing, respectively, the stationary contact may be coupled to the first portion of the intermediate plate, and both ends of the heat generating element may be coupled to the first and second portions of the intermediate plate, respectively.
According to another aspect of the present utility model, there is provided an electric vehicle comprising the dc protector as described above.
Other characteristic features and advantages of the utility model will become apparent from the following description with reference to the accompanying drawings.
Drawings
The drawings are included for illustrative purposes and are merely provided to provide examples of possible constructions and arrangements of the inventive arrangements disclosed herein. The figures in no way limit any changes in form and detail that may be made to the embodiments by those skilled in the art without departing from the spirit and scope of the embodiments. The embodiments will be more readily understood from the following detailed description taken in conjunction with the accompanying drawings, in which like reference numerals designate like structural elements.
Fig. 1 shows a schematic diagram of a dc protector according to an embodiment of the utility model.
Note that in the embodiments described below, the same reference numerals are used in common between different drawings to denote the same parts or parts having the same functions, and a repetitive description thereof may be omitted. In this specification, like reference numerals and letters are used to designate like items, and thus once an item is defined in one drawing, no further discussion thereof is necessary in subsequent drawings.
For ease of understanding, the positions, dimensions, ranges, etc. of the respective structures shown in the drawings and the like may not represent actual positions, dimensions, ranges, etc. Accordingly, the disclosed utility model is not limited to the disclosed positions, dimensions, ranges, etc. as illustrated in the drawings. Moreover, the figures are not necessarily to scale, some features may be exaggerated to show details of particular components.
Detailed Description
Various exemplary embodiments of the present disclosure will now be described in detail with reference to the accompanying drawings. It should be noted that the relative arrangement and numerical values of the components set forth in these embodiments do not limit the scope of the present disclosure unless specifically stated otherwise.
The following description of at least one exemplary embodiment is merely illustrative in nature and is in no way intended to limit the disclosure, its application, or uses. Those skilled in the art will appreciate that they are merely illustrative of exemplary ways in which the utility model may be practiced, and not exhaustive.
Techniques and equipment known to those of ordinary skill in the relevant art may not be discussed in detail, but should be considered part of the authorization specification where appropriate.
Fig. 1 shows a schematic diagram of a dc protector 100 according to an embodiment of the utility model. The dc protector 100 may be used for an electric vehicle. In particular, the dc protector 100 may be used for an electric vehicle employing a high dc voltage (higher than 24V, for example, 48V).
As shown in fig. 1, the dc protector 100 includes: a housing 1, and a movable contact 3, a stationary contact 4 and a magnet 6 arranged in the housing. Wherein the magnet 6 is arranged adjacent to the stationary contact 4 such that a magnetic induction line direction of a magnetic field generated between the movable contact 3 and the stationary contact 4 is different from a moving direction of the movable contact 3. Specifically, in the embodiment shown in fig. 1, the direction of the magnetic induction line of the magnetic field generated by the magnet 6 between the movable contact 3 and the stationary contact 4 is substantially the horizontal direction in the drawing, unlike the vertical direction in the drawing (i.e., the moving direction of the movable contact 3).
In this way, when the movable contact 3 moves to open the direct current protector 100, an arc is generated between the movable contact 3 and the stationary contact 4 in a substantially vertical direction (i.e., a moving direction of the movable contact 3). Because the direction of the magnetic induction line of the magnetic field is different from the direction of the electric arc, the electric arc can be subjected to Lorentz force perpendicular to the direction of the electric arc, so that the electric arc is pulled to be elongated by side force, and is rapidly extinguished.
Such an arrangement may effectively promote arc extinction at a lower cost and with less complexity, reduce the time for an arc to exist, reduce the adverse effects of the arc on the contacts, thereby improving the durability of the contacts and extending the life of the dc protector. Such an arrangement may allow for smaller, thinner contacts to be employed, thereby reducing the cost of the dc protector 100, reducing the size of the dc protector 100.
As shown in fig. 1, the magnets 6 may be arranged with the left side being the N pole and the right side being the S pole, or vice versa. In other words, the direction of the magnetic poles of the magnet 6 does not need to be strictly determined when the dc protector 100 is assembled, and the N pole and S pole of the magnet 6 can be arbitrarily exchanged without affecting the technical effect of the present device. This effectively simplifies the assembly process, improves the assembly speed, and facilitates automated assembly.
In a preferred embodiment, as shown in fig. 1, the magnet 6 is arranged such that the direction of the magnetic induction line of the magnetic field generated between the movable contact 3 and the stationary contact 4 is perpendicular to the moving direction of the movable contact 3. In this way, when the movable contact 3 moves to open the dc protector 100, the lorentz force received by the arc generated between the movable contact 3 and the stationary contact 4 is maximized. With this arrangement, the magnetic field generated by the magnet 6 can be fully utilized to save materials and reduce cost.
It will be appreciated by those skilled in the art that the foregoing "perpendicular" means perpendicular within a certain error range, for example, within 10% error. This is in accordance with engineering practices in the art.
In a preferred embodiment, as shown in fig. 1, the magnet 6 is arranged on the opposite side of the stationary contact 4 from the movable contact 3. In this way, the magnetic field generated by the magnet 6 can be fully utilized to better influence the arc generated between the movable contact 3 and the stationary contact 4, while less impeding the movement of the movable contact 3. With this arrangement, further material saving and cost reduction can be achieved.
In a preferred embodiment, as shown in fig. 1, the housing 1 comprises a first cavity and a second cavity separated by an intermediate plate 8. Wherein the movable contact 3 and the stationary contact 4 are arranged in a first cavity and the magnet 6 is arranged in a second cavity, the contacts being spaced from the magnet.
In a preferred embodiment, the intermediate plate 8 is composed of a non-ferromagnetic material, thereby reducing the influence of the intermediate plate 8 on the magnetic field distribution. Preferably, the intermediate plate 8 may be composed of a stainless steel material.
In a preferred embodiment, at least a portion of the housing 1 may be composed of ferromagnetic material, thereby forming an electromagnetic shield, avoiding electromagnetic interference of the external environment with the components inside the housing 1. But the ferromagnetic material will influence the distribution of the magnetic field generated by the magnet 6. In a preferred embodiment, a portion of the housing 1 that is further from the magnet 6 is composed of a ferromagnetic material and a portion that is closer to the magnet 6 is composed of a non-ferromagnetic material. The part of the housing 1 consisting of ferromagnetic material and non-ferromagnetic material can be adapted according to the actual application, so that a good balance is achieved between achieving electromagnetic shielding and reducing the influence on the magnetic field distribution.
In a preferred embodiment, the automatic overcurrent disconnection of the dc protector 100 is achieved using a bimetal disc. Specifically, a heating element 9 and a bimetal disc 2 are also arranged in the housing 1. The heating element 9 may be realized by a heating wire. The bimetal disc 2 may be composed of upper and lower metal layers having different thermal expansion coefficients. The movable contact 3 is coupled to the housing 1 via a bimetal disc 2. During normal operation of the direct current protector, the movable contact 3 is in contact with the stationary contact 4, and a current flows through the bimetal disc 2, the movable contact 3, the stationary contact 4, and the heating element 9 in this order. When the current is overloaded, the heat generated by the heating element 9 is higher, so that the upper and lower layers of metals in the bimetal disc 2 are heated and deformed greatly, and further, the bimetal disc 2 is bent due to the large deformation difference of the upper and lower layers of metals, so that the movable contact 3 is separated from the stationary contact 4. Thus, the dc protector 100 is automatically turned off.
In a preferred embodiment, the housing 1 and the intermediate plate 8 are used to conduct electrical current. Specifically, as shown in fig. 1, the case 1 may include a first portion (upper portion), a second portion (lower left side, denoted by reference numeral 7), and a third portion (lower right side) that are electrically conductive, and the bimetal disc 2 is coupled to the first portion of the case 1. The intermediate plate 8 may comprise a first (left) and a second (right) electrically conductive portion, which are coupled to the second and third portion of the housing 1, respectively. Wherein the first, second and third portions of the housing 1 are spaced apart, respectively, and the first and second portions of the intermediate plate 8 are spaced apart. The first part of the housing 1 is separated from the first and second parts of the intermediate plate 8 by insulating spacers 5, respectively. The stationary contact 4 is coupled to a first portion of the intermediate plate 8, and both ends of the heating element 9 are coupled to the first portion and a second portion of the intermediate plate 8, respectively.
During normal operation of the dc protector 100, the movable contact 3 is in contact with the stationary contact 4, and an electric current flows through the first portion of the housing 1, the bimetal disc 2, the movable contact 3, the stationary contact 4, the first portion of the intermediate plate 8 (and the second portion of the housing 1 coupled thereto), the heating element 9, the second portion of the intermediate plate 8, and the third portion of the housing 1 in this order. In a preferred embodiment, the first portion of the housing 1 may comprise a first terminal 1A for introducing current into the dc protector 100. The third portion of the housing 1 may comprise a second terminal 7A for leading current out of the dc protector 100.
In a preferred embodiment, the first portion of the housing 1 may be composed of a ferromagnetic material and the second and third portions may be composed of a non-ferromagnetic material.
In a preferred embodiment, the bimetallic disk 2 may be welded to the housing 1 via the metal block 10 at weld points 1B on the housing 1.
In a preferred embodiment, the housing 1 may be provided with an alignment area 1C corresponding to the bimetal disc 2 for alignment of the device.
The disclosure also relates to an electric vehicle comprising a direct current protector as described above. Electric vehicles may employ high dc voltages (higher than 24V, e.g., 48V). The use of a high dc voltage may, for example, reduce the operating current through the wiring harness, thereby reducing the cost of the wiring harness and, in turn, the manufacturing cost of the electric vehicle. In an electric automobile adopting high direct-current voltage, the working life of the direct-current protector can be prolonged by adopting the direct-current protector disclosed by the utility model, so that the reliability of the electric automobile is improved, and the maintenance frequency of the electric automobile is reduced.
In all examples shown and discussed herein, any specific values should be construed as merely illustrative, and not a limitation. Thus, other examples of the exemplary embodiments may have different values.
It will be further understood that the terms "comprises" and/or "comprising," when used herein, specify the presence of stated features, integers, steps, operations, elements, and/or components, but do not preclude the presence or addition of one or more other features, integers, steps, operations, elements, and/or components, and/or groups thereof.
While certain specific embodiments of the utility model have been illustrated in detail by way of example, it will be appreciated by those skilled in the art that the foregoing examples are intended to be illustrative only and not to limit the scope of the utility model. It will be appreciated by those skilled in the art that changes could be made to the embodiments described above without departing from the scope and spirit of the utility model. The scope of the utility model is defined by the appended claims.
Claims (10)
1. A dc protector, characterized in that the dc protector comprises:
A housing;
A movable contact, a stationary contact and a magnet disposed within the housing,
Wherein the magnet is disposed adjacent to the stationary contact such that a magnetic induction line direction of a magnetic field generated between the movable contact and the stationary contact is different from a moving direction of the movable contact.
2. The direct current protector according to claim 1, wherein the magnet is arranged such that a magnetic induction line direction of a magnetic field generated between the movable contact and the stationary contact is perpendicular to a moving direction of the movable contact.
3. The direct current protector according to claim 1, wherein the magnet is disposed on a side of the stationary contact opposite to the movable contact.
4. A dc protector according to any one of claims 1-3, characterized in that the housing comprises a first cavity and a second cavity separated by a middle plate, and that the movable contact and the stationary contact are arranged in the first cavity, and that the magnet is arranged in the second cavity.
5. A dc protector as claimed in any one of claims 1 to 3, characterized in that the intermediate plate is made of a non-ferromagnetic material.
6. A dc protector as claimed in any one of claims 1 to 3, characterized in that at least a part of the housing is made of ferromagnetic material.
7. A direct current protector according to any one of claims 1-3, characterized in that a heating element is arranged in the housing and that the movable contact is coupled to the housing via a bimetal disc.
8. The DC protector as set forth in claim 7,
The housing includes electrically conductive first, second and third portions, an
The bimetal disc is coupled to the first portion of the housing.
9. The DC protector as set forth in claim 8, wherein,
The intermediate plate comprises an electrically conductive first portion and a second portion,
The first and second portions of the intermediate plate are coupled to the second and third portions of the housing respectively,
The stationary contact is coupled to the first portion of the intermediate plate, and both ends of the heating element are coupled to the first portion and the second portion of the intermediate plate, respectively.
10. An electric vehicle, characterized in that it comprises a direct current protector according to any one of claims 1-9.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202321933087.9U CN220856439U (en) | 2023-07-20 | 2023-07-20 | DC protector and electric automobile |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202321933087.9U CN220856439U (en) | 2023-07-20 | 2023-07-20 | DC protector and electric automobile |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN220856439U true CN220856439U (en) | 2024-04-26 |
Family
ID=90782956
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202321933087.9U Active CN220856439U (en) | 2023-07-20 | 2023-07-20 | DC protector and electric automobile |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN220856439U (en) |
-
2023
- 2023-07-20 CN CN202321933087.9U patent/CN220856439U/en active Active
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