CN117080028B - Surge suppression device with arc extinguishing function - Google Patents
Surge suppression device with arc extinguishing function Download PDFInfo
- Publication number
- CN117080028B CN117080028B CN202311226366.6A CN202311226366A CN117080028B CN 117080028 B CN117080028 B CN 117080028B CN 202311226366 A CN202311226366 A CN 202311226366A CN 117080028 B CN117080028 B CN 117080028B
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- China
- Prior art keywords
- arc
- blocking
- arm
- suppression device
- surge suppression
- 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.)
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Links
- 230000001629 suppression Effects 0.000 title claims abstract description 28
- 230000000903 blocking effect Effects 0.000 claims abstract description 80
- 238000002955 isolation Methods 0.000 claims abstract description 13
- 239000000463 material Substances 0.000 claims description 9
- 125000006850 spacer group Chemical group 0.000 claims description 5
- 230000008033 biological extinction Effects 0.000 claims 1
- 238000000034 method Methods 0.000 claims 1
- 230000004888 barrier function Effects 0.000 abstract 2
- 230000001012 protector Effects 0.000 description 8
- 238000010438 heat treatment Methods 0.000 description 3
- 230000007935 neutral effect Effects 0.000 description 3
- 230000008018 melting Effects 0.000 description 2
- 238000002844 melting Methods 0.000 description 2
- 229910044991 metal oxide Inorganic materials 0.000 description 2
- 150000004706 metal oxides Chemical class 0.000 description 2
- 229910000679 solder Inorganic materials 0.000 description 2
- 230000015556 catabolic process Effects 0.000 description 1
- 230000008602 contraction Effects 0.000 description 1
- 238000007599 discharging Methods 0.000 description 1
- 229920006334 epoxy coating Polymers 0.000 description 1
- 238000010304 firing Methods 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 238000000926 separation method Methods 0.000 description 1
Classifications
-
- 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
- H01H73/18—Means for extinguishing or suppressing arc
-
- 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
- H01H71/10—Operating or release mechanisms
- H01H71/12—Automatic release mechanisms with or without manual release
- H01H71/14—Electrothermal mechanisms
-
- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02H—EMERGENCY PROTECTIVE CIRCUIT ARRANGEMENTS
- H02H9/00—Emergency protective circuit arrangements for limiting excess current or voltage without disconnection
- H02H9/04—Emergency protective circuit arrangements for limiting excess current or voltage without disconnection responsive to excess voltage
Landscapes
- Emergency Protection Circuit Devices (AREA)
Abstract
The invention discloses a surge suppressing device with an arc extinguishing function, which comprises a non-conductive isolator, a driving part and an isolating part, wherein the isolating part is embedded in a driving arm of the driving part and comprises a blocking element and an arc isolating element, and the blocking element is separated from the arc isolating element and can move relatively. In the first position, the barrier element biases the blocking element, and in the second position, the blocking element is separated from the barrier element. The isolation part is skillfully designed in the driving arm, so that the reaction is sensitive, the arc isolation time is short, and the reliability and the safety of the whole surge suppression device are greatly improved.
Description
Technical Field
The present invention relates to a surge protector for circuit protection, and more particularly, to a surge suppression device having an arc extinguishing function.
Background
The surge suppressing device is an electronic device for providing safety protection for various electronic equipment, instruments and meters and communication lines. When surge current or voltage is suddenly generated in an electric loop or a communication line due to external interference, the surge protector can conduct and shunt in a very short time, so that damage of the surge to other devices in the loop is avoided.
Surge suppression devices typically include one or more Metal Oxide Varistors (MOVs), typically connected between a phase line and a ground (or neutral) line, for discharging voltage surge energy present on the line. MOVs are nonlinear electronic devices that may be subjected to various applied stresses, such as temperature stress or temporary overpressure stress, during operation. When the MOV is subjected to overstress, i.e. exceeds the rated value of the MOV, the MOV deteriorates, resulting in increased leakage currents, often heating and possibly thermal breakdown shorts. The heating of the MOV causes the temperature of the surge suppression device to rise, which can cause a fire when the temperature reaches the ignition point of the combustible material (e.g., epoxy coating or plastic housing) surrounding it.
To reduce the risk of a surge suppression device firing, the design of a thermal protector for the MOV has emerged. Although such thermal protectors can be used to disconnect a spent MOV from the power supply circuit under certain conditions, to some extent, fire of the surge suppression device can be prevented. However, it is disadvantageous that if the MOV chip is broken down and shorted before the thermal protection switch is opened, an arc is generated between gaps formed after the thermal protector is opened, and the arc current is equal to the short-circuit current of the power system, so that the common thermal protector is likely to be unable to extinguish the arc. On the other hand, even if the MOV chip is not broken short before the thermal protector contacts are opened, arcing may still occur between the electrodes of the thermal protector that contact the MOV and the electrodes on the MOV surface when the voltage between the electrodes is too high and/or the gap formed is too small. Thus, the fault current from the power supply can continue to be maintained and the surge suppression device can still be in danger of ignition.
Disclosure of Invention
One aspect of the present invention provides a surge suppression device having an arc extinguishing function, comprising:
a voltage sensitive element having a predetermined rated voltage, the temperature of the voltage sensitive element increasing when a voltage applied to the voltage sensitive element exceeds the rated voltage;
a first terminal having one end electrically connected to a first surface of the voltage sensitive element;
A second terminal including a fixing portion and a leaving portion electrically connected to the fixing portion through a thermosensitive material, the fixing portion being electrically connected to a second surface of the voltage sensitive element; and
A non-conductive isolator movable from a first position in which the non-conductive isolator allows the outgoing portion to be electrically connected to the fixed portion to a second position in which the outgoing portion is not electrically connected to the fixed portion,
The non-conductive isolator comprises a driving part and an isolating part, wherein the driving part comprises a driving arm, a pivot shaft positioned at one end of the driving arm and a first elastic piece positioned at the other end of the driving arm, and in the first position, the driving arm is abutted against a separating part under the action of the first elastic piece and exerts a acting force on the separating part so as to enable the separating part to have a trend of separating from the fixing part, and in the second position, the driving arm enables the separating part to be physically separated from the fixing part;
The drive arm includes a first portion adjacent the first resilient member, a third portion adjacent the pivot shaft, and a second portion between and connected to the first portion and the third portion;
The isolation part is embedded in the driving arm of the driving part and comprises a blocking element embedded in the second part and an arc isolation element embedded in the third part, wherein the blocking element is separated from the arc isolation element and can move relatively; and
In the first position, the arc blocking element biases the blocking element, and in the second position, the blocking element is separated from the arc blocking element, and the arc blocking element is interposed between and blocks the fixing portion and the leaving portion.
In some embodiments, the arc blocking member includes an arc blocking rod and a second resilient member that biases the arc blocking rod against the blocking member.
In some embodiments, the blocking element comprises a first blocking arm opposite at least a portion of the fixation section; a second blocking arm parallel to the first blocking arm and abutting and blocking the arc-isolating element in the first position; and a connecting arm connecting the first blocking arm and the second blocking arm.
In some embodiments, the first blocking arm extends to contact the securing portion.
In some embodiments, the second portion of the drive arm includes a first baffle and a second baffle disposed at intervals along the extension direction of the first or second blocking arm, the first baffle abutting the connecting arm in a first position and the second baffle abutting the connecting arm in a second position.
In some embodiments, the drive arm includes a recess formed by first, second and third edges connected in sequence, the recess having an opening toward the fixed portion, the first edge abutting the leaving portion, and the second edge opposing the fixed portion.
In some embodiments, the third edge has a notch opposite the arc-blocking element, the arc-blocking element being movable through the notch to be located between the fixed portion and the exiting portion.
In some embodiments, the arc-isolating rod of the arc-isolating element extends in the same direction or in parallel with the direction in which the contact interface of the fixed portion and the leaving portion extends.
In some embodiments, the arc-blocking rod of the arc-blocking element extends in a direction perpendicular to the direction of extension of the second blocking arm.
In some embodiments, the spacer is exposed to a surface of the drive arm facing toward or away from the voltage sensitive element.
The isolation part is skillfully designed in the driving arm, so that the isolation part is linked with the driving arm, the separation position can be reached at the moment of separating the fixed part from the leaving part, and the isolation rod and the blocking arm are separately arranged, so that the reaction is sensitive, the arc isolation time is short, and the reliability and the safety of the whole surge suppression device are greatly improved.
Drawings
Various embodiments of the present invention will now be further described with reference to the accompanying drawings, wherein the various elements shown are provided for illustration only and are therefore illustrative and should not be construed as limiting the scope of the invention.
Fig. 1 shows an internal structural view of a surge suppression device according to one embodiment of the present invention, with the elements in a first position.
Fig. 2 shows an internal structural view of the surge suppression device according to the embodiment shown in fig. 1, with the elements in a second position.
Fig. 3 shows an overall schematic of a surge suppression device according to one embodiment of the present invention.
Detailed Description
The present invention will be described below in connection with the following detailed description and the accompanying drawings, it being understood that these detailed description are merely exemplary of ways to carry out the invention, and that one or more features set forth in one embodiment may be combined with one or more features set forth in another embodiment to form yet another embodiment including a combination of features from the different embodiments, all of which are contemplated from the disclosure of the present invention, as falling within the scope of the present invention. Similarly, it is within the scope of the invention that one feature of the invention shown in one figure may be combined with another feature of the invention in another figure to form a new embodiment.
Fig. 1 and 2 illustrate an exemplary embodiment of the present invention showing the active and inactive states of the surge suppression device 100, respectively. The surge suppression device is generally rectangular with the housing 30 and base 40 (shown in fig. 3) omitted for clarity of illustration of the internal components. The surge suppression device 100 includes a Metal Oxide Varistor (MOV) having a predetermined rated voltage, and when the voltage applied across the MOV exceeds the rated voltage, the temperature of the MOV increases. In fig. 1 and 2, the MOV is provided on the back of the shown element and is therefore not shown.
The surge suppression device 100 includes a first terminal 110 and a second terminal 120. One end of the first terminal 110 and one end of the second terminal 120 are electrically connected to both surfaces of the MOV (in the figure, one end of the first terminal is connected to the back side of the MOV, one end of the second terminal is connected to the front side of the MOV), and the other end is connected to the ground or neutral and phase lines, respectively. MOVs are capable of sensing a voltage drop between the phase and ground or neutral lines.
As shown in fig. 2, second terminal 120 includes a fixed portion 122 and a leaving portion 124. The securing portion 122 extends inwardly to be electrically connected to the front face of the MOV. In an operating state (as shown in fig. 1), the leaving portion 124 is electrically connected to the fixing portion 122 through a heat sensitive material (e.g., solder material). The exit portion 124 is also connected to a resilient conductive wire 126.
The surge suppression device 100 includes a non-conductive isolator 20, the non-conductive isolator 20 being movable from a first position, shown in fig. 1, to a second position, shown in fig. 2. In the first position, nonconductive isolator 20 allows leaving portion 124 to be electrically connected to stationary portion 122, and in the second position leaving portion 124 is not electrically connected to stationary portion 122.
According to the present invention, the non-conductive separator 20 includes a driving part 210 and a separating part 220. The drive portion 210 includes a drive arm 212, a pivot 214 at one end of the drive arm 212, and a first resilient member 216 (e.g., a spring 216 or other resilient member) at the other end of the drive arm 212, wherein in a first position shown in fig. 1, the drive arm 212 abuts the break-away portion 124 and exerts a force on the break-away portion 124 to cause it to have a tendency to break away from the fixed portion 122 under the influence of the first resilient member 216, and in a second position shown in fig. 2, the drive arm 212 physically separates the break-away portion 124 from the fixed portion 122.
According to the invention, the driving arm 212 comprises a first portion 211 adjacent to the first elastic member 216, a third portion 215 adjacent to the pivot 214, and a second portion 213 between and connected to the first portion 211 and the third portion 215.
According to the invention, the spacer 220 is embedded in the driving arm 212 of the driving part 210 and comprises a blocking element 310 embedded in the second part 213 and an arc-isolating element 320 embedded in the third part 215, the blocking element 310 being separate from the arc-isolating element 320 and being capable of relative movement.
In the first position shown in fig. 1, arc blocking member 320 biases blocking member 310, and in the second position shown in fig. 2, blocking member 310 is separated from arc blocking member 320, and arc blocking member 320 is interposed between leaving portion 124 of securing portion 122 and blocks securing portion 122 and leaving portion 144.
In this embodiment, as shown in FIG. 1, the arc blocking member 320 includes an arc blocking rod 322 and a second resilient member 324, the second resilient member 324 biasing the arc blocking rod 322 against the blocking member 310 in the first position. The blocking element 310 comprises a first blocking arm 312 opposite at least a portion of the fixed part 122; a second blocking arm 316 parallel to the first blocking arm 312 and abutting and blocking the arc blocking element 320 in the first position (e.g., via an end of the arc blocking rod 322); and a connecting arm 314 connecting the first blocking arm 312 and the second blocking arm 316.
In this embodiment, the first blocking arm 312 is not in contact with the fixing portion 122. Those skilled in the art will appreciate that in other embodiments, the first blocking arm 312 may extend to contact the securing portion 122.
As shown in fig. 2, the second portion 213 of the driving arm 212 includes a first shutter 217 and a second shutter 218 spaced apart along the extension direction of the first or second blocking arms 312 and 316, the first shutter 217 abutting the connecting arm 314 in the first position and the second shutter 218 abutting the connecting arm 314 in the second position. The first and second baffles 217 and 218 may be spaced apart by a distance of 0.5 to 2 cm, for example 0.5 cm, 1 cm, 1.5 cm or 2 cm, or longer or shorter, as may be desired.
In this embodiment, the drive arm 212 includes a recess 240 formed by a first edge 241, a second edge 242, and a third edge 243, which are connected in sequence. The recess 240 has an opening facing the fixing portion 122, a first edge 241 abuts the detaching portion 124, and a second edge 242 is opposite to the fixing portion 122. The third edge 243 has a notch 245 opposite the arc chute 322 of the arc chute 320. As shown in fig. 2, arc chute 322 is movable through gap 245 to lie between fixed portion 122 and leaving portion 124.
In this embodiment, arc-shielding rod 322 of arc-shielding element 320 extends in the same direction as the contact interface of fixed portion 122 and leaving portion 124 extends. In other embodiments, the direction of extension of arc chute 322 may also be substantially parallel to the direction in which the contact interface of fixed portion 122 and leaving portion 124 extends. In this embodiment, the arc-isolating rods 322 extend in a direction substantially perpendicular to the direction in which the second blocking arms 316 extend. In other embodiments, the extending direction of the arc isolating rods 322 may be arranged at a non-perpendicular angle to the extending direction of the second blocking arms 316.
In this embodiment, the spacer 220 is exposed to the surface of the drive arm 212 remote from the voltage sensitive element, i.e. the surface visible in the figure. In this embodiment, the spacer 220 is exposed to the surface of the drive arm 212 facing the voltage sensitive element and may be covered from view by the drive arm 212.
In the first position shown in fig. 1, the first elastic element 216 is in a stretched state, such that the driving arm 212 abuts against the leaving portion 124 through the first edge 241, and at this time, the leaving portion 124 is mechanically and electrically connected to the fixing portion 122 via a heat sensitive material (e.g. a low temperature solder material), and the force exerted on the driving arm 212 by the first elastic element 216 is insufficient to separate the leaving portion 124 from the fixing portion 122. In the first position, the second elastic member 324 is in a state of biasing the arc-shielding rod 322 toward the fixed portion 122, so that the arc-shielding rod 322 abuts against the second blocking arm 316. The second blocking arm 316 prevents the arc chute 322 from moving through the notch 245.
When the circuit experiences a surge, the MOV temperature increases and the anchor 122 conducts heat to increase in temperature, resulting in a decrease in hardness of the heat sensitive material and onset of melting or melting. At the critical point, the hardness of the thermally sensitive material is reduced to such an extent that it is unable to resist the force exerted by the actuator arm 212 on the off-going portion 124, and thus the mechanical connection between the off-going portion 124 and the fixed portion 122 is unable to be maintained, further heating up, i.e. causing the actuator arm 212 to push the off-going portion to rotate about its pivot 125 towards the second position shown in fig. 2 under the contraction of the first elastic element 216.
When the drive arm 212 pushes the break-away portion 124 away from the fixed portion 122, the isolation portion 220 (including the arc-isolating member 320 and the blocking member 310) embedded in the drive arm 212 also moves with the drive arm 212 under the action of the first elastic member 216, so that the arc-isolating member 320 passes over the contact interface of the fixed portion 122 and the break-away portion 124. At the same time, the first blocking arm 312 abuts against the fixed portion 122 as the driving arm 212 moves, after abutting against the fixed portion 122, the blocking element 310 remains motionless as the driving arm 212 moves further, and the driving arm 212 continues to rotate around the pivot 214 under the action of the first elastic element 216, so that the arc-blocking rod 322 of the arc-blocking element 320 is separated from the second blocking arm 316, the second blocking arm 316 no longer blocks the arc-blocking rod 322, and the arc-blocking rod 322 moves through the notch 245 under the action of the elastic force of the second elastic element 324 and moves between the fixed portion 122 and the leaving portion 124, and the arc possibly generated between the fixed portion 122 and the leaving portion 124 is blocked.
Fig. 3 shows an overall schematic of a surge protection device 300 according to one embodiment of the present invention, which is comprised of a housing 30 and a base 40. The case 30 may contain therein the structure shown in embodiment 1 or 2. The surge protection device 300 may be a single device as shown or a plurality of surge protection devices 300 may be connected in parallel or in series to form a surge protection device assembly, as is known in the art. The invention also provides an assembly of such a surge protection device.
The foregoing is merely a preferred embodiment of the present invention, and various modifications may be made thereto by those skilled in the art without departing from the scope of the present invention. As previously mentioned, features or combinations of features mentioned in the embodiments may be present alone or in combination with features or combinations of features in other embodiments for the purpose of the present invention.
Claims (10)
1. A surge suppression device with arc extinction, comprising:
a voltage sensitive element having a predetermined rated voltage, the temperature of the voltage sensitive element increasing when a voltage applied to the voltage sensitive element exceeds the rated voltage;
a first terminal having one end electrically connected to a first surface of the voltage sensitive element;
A second terminal including a fixing portion and a leaving portion electrically connected to the fixing portion through a thermosensitive material, the fixing portion being electrically connected to a second surface of the voltage sensitive element; and
A non-conductive isolator movable from a first position in which the non-conductive isolator allows the outgoing portion to be electrically connected to the fixed portion to a second position in which the outgoing portion is not electrically connected to the fixed portion,
It is characterized in that the method comprises the steps of,
The non-conductive isolator comprises a driving part and an isolating part, wherein the driving part comprises a driving arm, a pivot shaft positioned at one end of the driving arm and a first elastic piece positioned at the other end of the driving arm, and in the first position, the driving arm is abutted against a separating part under the action of the first elastic piece and exerts a acting force on the separating part so as to enable the separating part to have a trend of separating from the fixing part, and in the second position, the driving arm enables the separating part to be physically separated from the fixing part;
The drive arm includes a first portion adjacent the first resilient member, a third portion adjacent the pivot shaft, and a second portion between and connected to the first portion and the third portion;
The isolation part is embedded in the driving arm of the driving part and comprises a blocking element embedded in the second part and an arc isolation element embedded in the third part, wherein the blocking element is separated from the arc isolation element and can move relatively; and
In the first position, the arc blocking element biases the blocking element, and in the second position, the blocking element is separated from the arc blocking element, and the arc blocking element is interposed between and blocks the fixing portion and the leaving portion.
2. The surge suppression device of claim 1, wherein the arc blocking element comprises an arc blocking rod and a second resilient member biasing the arc blocking rod against the blocking element.
3. The surge suppression device of claim 2, wherein the blocking element comprises a first blocking arm opposite at least a portion of the fixed portion; a second blocking arm parallel to the first blocking arm and abutting and blocking the arc-isolating element in the first position; and a connecting arm connecting the first blocking arm and the second blocking arm.
4. The surge suppression device of claim 3, wherein the first blocking arm extends to contact the fixed portion.
5. The surge suppression device of claim 3, wherein the second portion of the drive arm includes a first stop and a second stop spaced apart along the extension of the first or second stop, the first stop abutting the connecting arm in a first position and the second stop abutting the connecting arm in a second position.
6. The surge suppression device of claim 5, wherein the drive arm includes a recess formed by first, second and third edges connected in sequence, the recess having an opening toward the fixed portion, the first edge abutting the exiting portion, and the second edge opposing the fixed portion.
7. The surge suppression device of claim 6, wherein the third edge has a notch opposite the arc blocking element, the arc blocking element being movable through the notch to be located between the fixed portion and the leaving portion.
8. The surge suppression device of claim 2, wherein the arc-isolating rod of the arc-isolating element extends in the same direction or in a direction parallel to the direction in which the contact interface of the fixed portion and the leaving portion extends.
9. A surge suppressing device according to claim 3, wherein the direction of extension of the arc-isolating rod of the arc-isolating element is perpendicular to the direction of extension of the second blocking arm.
10. The surge suppression device of claim 1, wherein the spacer is exposed to a surface of the drive arm facing toward or away from the voltage sensitive element.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202311226366.6A CN117080028B (en) | 2023-09-21 | 2023-09-21 | Surge suppression device with arc extinguishing function |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202311226366.6A CN117080028B (en) | 2023-09-21 | 2023-09-21 | Surge suppression device with arc extinguishing function |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN117080028A CN117080028A (en) | 2023-11-17 |
| CN117080028B true CN117080028B (en) | 2024-05-31 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202311226366.6A Active CN117080028B (en) | 2023-09-21 | 2023-09-21 | Surge suppression device with arc extinguishing function |
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| CN (1) | CN117080028B (en) |
Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN204131121U (en) * | 2014-11-10 | 2015-01-28 | 毛小毛 | There is the surge suppressor of high structural stability |
| CN117254440A (en) * | 2023-09-21 | 2023-12-19 | 佛山市浦斯电子有限公司 | Surge suppression device with arc extinguishing function |
-
2023
- 2023-09-21 CN CN202311226366.6A patent/CN117080028B/en active Active
Patent Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN204131121U (en) * | 2014-11-10 | 2015-01-28 | 毛小毛 | There is the surge suppressor of high structural stability |
| CN117254440A (en) * | 2023-09-21 | 2023-12-19 | 佛山市浦斯电子有限公司 | Surge suppression device with arc extinguishing function |
Non-Patent Citations (1)
| Title |
|---|
| 建筑物浪涌保护器（SPD）结构设计;罗禄全;;科技创新与应用;20200325(09);全文 * |
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| Publication number | Publication date |
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| CN117080028A (en) | 2023-11-17 |
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