WO2013067923A1

WO2013067923A1 - Tripping mechanism for surge protector and surge protector

Info

Publication number: WO2013067923A1
Application number: PCT/CN2012/084178
Authority: WO
Inventors: 孙玮; 刘全和
Original assignee: 施耐德电器工业公司
Priority date: 2011-11-07
Filing date: 2012-11-07
Publication date: 2013-05-16
Also published as: BR112014010904A2; EP2765590A1; BR112014010904B1; CN103094013A; ES2611404T3; ZA201404030B; CN103094013B; EP2765590A4; EP2765590B1

Abstract

Provided are a tripping mechanism for use in a surge protector and the surge protector comprising the tripping mechanism. The tripping mechanism (100) comprises a frame bracket (110) for use in holding at least one metal oxide rheostat (200), a tripping rod (120) pivotably arranged on the frame bracket and connected to one electrode (210) of the metal oxide rheostat via a low-temperature solder, and a slidable block (120) slidably arranged on the bracket frame between a first position and a second position and biasly pressed towards a tripping position. In a normal working state, the slidable block is maintained at the first position by the tripping rod countering the biasing pressure. In a tripped state, the slidable block slides towards the second position under the effect of the biasing pressure, causing the tripping rod to pivot along the direction away from the electrode of the metal oxide rheostat. Because the tripping mechanism pivots away from the electrode of the metal oxide rheostat when in the tripped state, the electrical distance between the tripping rod and the electrode is thus increased, and the reliability of electrical insulation between both is thus improved.

Description

Tripping mechanism and surge protector for surge protector

The present invention relates to a surge protector, and more particularly to a trip mechanism for the surge protector. Background technique

Surge protectors are commonly used in electrical circuits in homes, offices, industrial locations, etc., to prevent damage to electrical equipment caused by transient overvoltages in the line. When a sudden spike or voltage is suddenly generated in an electrical circuit or communication line due to external interference, the surge protector can conduct shunting in a very short time, thereby avoiding damage to other equipment in the loop by the surge.

Among the most commonly used surge protectors, a component called a metal oxide varistor (MOV) is used to transfer excess voltage. The metal oxide varistor has a very large resistance under normal operating conditions, and thus is substantially in an open state, and when the voltage in the circuit exceeds a predetermined value, for example, in the case of a lightning strike, the resistance drops sharply, This is in a near-conducting state, conducting a large amount of current and eliminating excess voltage.

However, after a long period of use, the metal oxide varistor will age and heat up, in order to prevent the metal oxide varistor from being damaged by overheating, and in order to prevent fires and the like due to temperature rise, usually in a surge protector A trip mechanism is provided in the series, the trip mechanism is connected in series with the metal oxide varistor to disengage the metal oxide varistor from the circuit when the temperature rises.

Figure 1 shows a trip mechanism for use in the prior art. The trip mechanism mainly comprises a substantially plate-shaped trip bar 1 which is swingably mounted by a pivot 3 provided on the surge protector bracket 2, and the upper end 11 of the trip bar 1 is biased The spring 4 faces the right side in Fig. 1, i.e., toward the tripping direction, biased. At the lower end of the trip lever 1, a remote signal switch lever 12 is integrally formed, which cooperates with a remote signal switch (not shown) to activate the remote signal switch. Further, the middle portion of the trip bar 1 is welded to the MOV 5 by a low temperature solder (not shown), and the trip bar 1 is also connected to the terminal 9 of the surge protector via the lead 8, and the terminal 9 is connected to the outer line. The other electrode of the MOV 5 is connected to the other terminal 10 of the surge protector, thereby connecting the surge protector to the line.

An indicator bracket 6 indicating the current surge protector state is disposed on the upper side of the bracket 2, and The indicator bracket 6 is biased toward the right side in Fig. 1 by another biasing spring 7, i.e., in the same direction as the biasing spring 4 biases the trip lever 1. One end of the indicator bracket 6 is an indicating portion, usually green, which can be exposed through an opening provided in a surge protector housing (not shown), whereby the indicating portion can be seen from the outside. Also, a red indicating portion is formed at a position on the bracket 2 corresponding to the indicating portion.

Under normal operating conditions, the trip bar 1 is soldered to the MOV 5 by a low temperature solder, whereby the trip bar 1 is electrically connected to the MOV 5 and mechanically coupled together. At this time, the trip lever 1 is in the position shown in FIG. 1, and the indicator bracket 6 is held in the position shown in FIG. 1 by being pressed against the upper end portion of the trip lever 1, at this time, the indicator The green indicating portion on the bracket 6 is overlaid on the red indicating portion on the bracket 2, whereby a green indicating portion indicating that the current surge protector is in a normal working state is seen from the outside of the outer casing of the surge protector.

When the temperature rises to a certain extent, the low temperature solder melts, and the trip bar 1 rotates clockwise around the pivot 3 under the action of the biasing spring 4, whereby the trip bar 1 and the MOV 5 are electrically Disconnect. At the same time, the remote signal switch lever 12 at the lower end of the trip lever 1 triggers the remote control switch as the trip lever 1 rotates to signal the remote control device that the trip lever 1 is tripped. In addition, due to the clockwise rotation of the trip lever 1, the indicator bracket 6 slides to the right on the upper side of the bracket 2 by the biasing spring 7, whereby the green indicating portion slides to the right side, and is exposed on the bracket 2 The red indicating portion is set upward, whereby a red indicating portion indicating the trip of the surge protector is seen outside the surge protector housing.

However, such a conventional surge protector trip mechanism has the following problems: The trip lever 1 basically moves in a plane parallel to the side of the MOV 5, so that even when the trip lever 1 is tripped, The electrical distance between the buckle 1 and the electrode of the MOV 5 is short, which is not conducive to electrical isolation between the two in the case of tripping. In addition, the standard MOV products have limited protection level and discharge capacity, while the cost of non-standard single-chip products is high. Therefore, for example, when the nominal discharge current is 35kA, two 20kA standard single-chip MOVs are usually used to complete the production. The case of using two MOVs. In the case where two or more MOVs are used, it is necessary to use two of the above-described tripping mechanisms, that is, another tripping lever 1 is provided in a similar manner on the rear side not shown in the drawing. The other trip bar 1 is welded to another MOV located on the rear side of the figure. However, when the temperature rises, since the two trip levers 1 operate independently, the above-described prior art trip mechanism is difficult to satisfy the two MOV trip synchronizations. If it is not guaranteed that the two MOVs will trip at the same time, for example, there may be a trip in the above example that does not trip, that is, the 20kA standard single-chip MOV is in a 35kA surge environment, which may cause MOV explosion. Summary of the invention

The present invention has been made in view of the above problems in the prior art, and an object of the present invention is to provide a trip mechanism for a surge protector that can ensure a trip lever and an MOV in a tripped state. The electrical distance between them, and in the case of using multiple MOVs, simultaneous tripping of multiple MOVs can be easily achieved.

According to an aspect of the present invention, a trip mechanism is provided, comprising: a bracket for accommodating at least one metal oxide varistor; and pivotally disposed on the bracket and passing the low temperature solder and the metal oxide A tripping rod to which one of the electrodes of the varistor is connected. The venting mechanism further includes a slider slidably disposed on the bracket between the first position and the second position and biased toward the trip position, in the normal working state, the slider Being held by the trip lever against the bias in the first position, and in the tripped state, sliding of the slider to the second position under the bias causes the off The buckle pivots in a direction away from the electrode of the metal oxide varistor.

Thereby, since the trip lever is pivoted away from the electrode of the metal oxide varistor in the trip state, the electrical distance between the two is increased, and the reliability of electrical insulation between the two is improved.

A rocker pivotally mounted on the bracket is also provided, the sliding of the slider to the second position will cause the swing lever to pivot to trigger a remote control switch.

Thereby, the disengagement of the trip lever and the swing of the swing lever are realized by the action of the slider, which simplifies the structure of the entire trip mechanism, reduces the manufacturing cost, and improves the reliability of the mechanism.

Preferably, the slider is provided with a state indicating portion indicating a normal working state, and when the slider is in the first position, the state indicating portion can pass through an opening provided on the surge protector housing Or the transparent window is observed from the outside.

Further, a state indicating portion indicating a trip state is provided on the bracket, and in the first position, the state indicating portion indicating the trip state is set on the slider to indicate a normal working state The indicating portion is occluded, and in the second position, the state indicating portion indicating the trip state is exposed and can be viewed from the outside through an opening or a transparent window provided on the surge protector housing.

Preferably, the slider includes an inclined surface, and in the first position, the trip bar abuts against the inclined surface. Thereby, the trip lever can be tripped with a simple structure.

Preferably, in the second position, the slider is located between the electrode and the trip bar. A channel is provided on a lower side of the inclined surface, and in the second position, the electrode is housed in the channel.

Thus, in the tripped state, in addition to increasing the distance between the trip bar and the electrode, the slider is also placed between the trip bar and the electrode of the MOV, and the electrode is accommodated in the channel of the slider, further improving The electrical insulation strength between the trip bar and the electrode of the MOV.

Optionally, one or more biasing springs are also included, the biasing spring engaging one end of the slider and the other end engaging the bracket to bias the slider to the second position.

Preferably, the first end of the trip bar is pivotally coupled to the bracket and the second end of the trip bar is welded to the electrode. Specifically, the second end of the trip bar is formed with a slot into which the electrode is inserted and soldered.

By inserting the electrode of the MOV into the slot and soldering it to the slot, the welding reliability between the electrode of the MOV and the trip bar can be improved, and this lateral welding can reduce d, surge impact on the MOV Temperature effect.

According to another aspect of the invention, two metal oxide varistors are housed in the bracket of the trip mechanism described above, and the respective electrodes of the two metal oxide varistor are welded at the same position of the same trip lever, ie, two Two respective electrodes of the metal oxide varistor are inserted into the slots of the trip bar and soldered thereto by low temperature solder.

According to still another aspect of the present invention, a surge protector is provided, the surge protector including the trip mechanism. DRAWINGS

The above and other aspects, features, advantages and technical and industrial advantages of the present invention will become better understood from Schematic diagram of the trip mechanism of the surge protector;

2A is an exploded perspective view of a trip mechanism of a surge protector, including a MOV, in accordance with a preferred embodiment of the present invention;

Figure 2B is a perspective view of the trip mechanism shown in Figure 2A assembled together;

Figure 3A is a side view of the trip mechanism shown in Figure 2B;

Figure 3B is a cross-sectional view taken along line BB in Figure 3A; Figure 3C is an enlarged view of a circled portion in Figure 3B;

Figure 4 is a perspective view showing the trip mechanism in a normal operating state;

Figure 5 is a perspective view showing the trip mechanism in a tripped state;

6A is an exploded perspective view of a trip mechanism of a surge protector according to another preferred embodiment of the present invention, including two MOVs;

Figure 6B is a perspective view of the trip mechanism shown in Figure 6A assembled together;

Figure 7A is a side view of the trip mechanism shown in Figure 6B;

Figure 7B is a cross-sectional view taken along line B-B of Figure 7A;

Figure 7C is an enlarged view of a circled portion in Figure 7B;

A trip mechanism according to a preferred embodiment of the present invention will now be described in detail with reference to the accompanying drawings.

Referring to Figures 2A through 5, a trip mechanism 100 in accordance with a first embodiment of the present invention will be described. The trip mechanism 100 includes a bracket 110 that is generally square in shape to accommodate the MOV 200. A pivot shaft 111 is formed at the upper right corner of the bracket 110, and the trip lever 120 is pivotally disposed on the bracket 110 about the pivot shaft 111. Specifically, at one end portion 121 (the right end in the drawing) of the trip bar 120, a pit or hole may be formed, into which the pivot 111 is inserted. In addition, the trip bar 120 is also coupled to the terminal 300 of the surge protector via a lead 122 for connecting the surge protector to an external line.

As clearly shown in FIGS. 4 and 5, the other end of the trip bar 120 is a connecting end, and the connecting end is substantially flat, but a concave platform 123 is formed at a substantially intermediate position in the width direction of the flat connecting end. A through slot 124 is formed in the middle of the recessed platform 123. The slot 124 can be open at one end or closed at both ends.

On the upper side of the bracket 110, a slider 130 is also provided. The slider 130 is slidably disposed on the upper side of the bracket 110. For example, the bracket 110 is provided with a guiding portion 112, and the slider 130 is slidable under the guidance of the guiding portion 112. And as shown, a biasing spring 140 (two in the figure) is provided, one end of the biasing spring 140 is engaged with the right end of the slider 130, and the other end of the biasing spring 140 is engaged with the pivot 111. Thereby, the slider 130 is biased toward the right side by the biasing spring 140, that is, biased toward the pivot 111. A passage 134 is also formed in the longitudinal direction at the intermediate position of the bottom of the slider 130, the passage 134 is for preventing the slider 130 from interfering with the electrode 210 of the MOV 200 during the sliding of the slider 130, and will be described below. In An indication portion 131, that is, a green indicating portion, is formed on the left end of the slider 130. Similar to the prior art, in the state shown in FIG. 2B, the green indicating portion is exposed through an opening or a window provided in the outer casing of the surge protector to indicate that the surge protector is in a normal working state.

On the lower side of the bracket 110, another pivot 113 is further formed. The swing lever 150 is pivotally disposed on the bracket 110 through the pivot 113. One end of the swing lever 150 (the lower end in the figure) is formed with a switch trigger. Section 151 is for triggering a remote control switch not shown in the figure. The other end of the swing lever 150 (upper end in the drawing), as shown in FIG. 4, is formed with a dial portion 152 that engages with a boss 132 provided on the slider 130, thereby being disposed on the slider When the 130 slides to the right, the swing lever 150 is toggled to rotate clockwise about the pivot 113.

As shown in Fig. 2A, the MOV 200 includes two electrodes 210 and 220. As shown in FIGS. 3C and 4, in the normal operating state, the MOV 200 is housed in the bracket 110, and one electrode 210 of the MOV is inserted into the slot 124 formed in the recessed platform 123 of the trip bar 120, and passes through The low temperature solder 400 is connected to the trip bar 120. The other electrode 220 of the MOV 200 is connected to the other terminal 500 of the surge protector, for example by soldering, which is connected to an external line. The MOV 200 is connected on the one hand to one of the external lines via the trip bar 120 and the terminal 300, and on the other hand to the other of the external lines via the other electrode 220 and the other terminal 500 of the surge protector. And when the voltage between the two phases of the external line exceeds a predetermined voltage value, the MOV 200 turns on the two phases to function as a shunting step-down.

As shown in FIG. 4, in the normal working state, a slope 133 is formed on the middle portion of the slider 130, and the edge of the connection end of the trip bar 120 abuts on the slope 133, thereby blocking the slider 130 from being biased by the spring. The 140 is pulled toward the pivot 111. In this state, the slider 130 is in the first position, and the indication portion 131 can be seen from the outside through the opening or the transparent window provided on the housing of the surge protector, thereby indicating that the surge protector is in normal operation. status.

When the temperature in the surge protector rises and reaches or exceeds a predetermined temperature threshold, the low temperature solder 400 melts, at which time the connection between the trip bar 120 and the electrode 210 of the MOV 200 is broken, thereby releasing the trip bar 120 has no effect of blocking the sliding of the slider 130. In this case, the slider 130 slides toward the right direction in the drawing under the bias of the biasing spring 140 and at the same time the slope 133 of the slider 130 pushes the trip lever 120 upward, so that the trip lever 120 surrounds the pivot 111 Rotate clockwise along the diagram. Referring to Figure 5, Figure 5 shows the trip mechanism in the tripped state. In the state shown in FIG. 5, the slider 130 is slid to the second position on the right side, and the trip lever 120 has been pushed up, while the slider 130 covers the electrode 210 of the MOV 200, at this time, the electrode 210 is accommodated It is received in channel 134, thereby electrically isolating electrode 210 from trip bar 130. At this time, as can be seen from FIG. 5, the green indicating portion 131 has been slid to the right, thereby exposing the red indicating portion 114 provided on the bracket 110 which was previously blocked by the green indicating portion 131. As the slider 130 slides to the right, the boss 132 on the slider 130 pushes the dial end 152 of the swing lever 150, thereby rotating the swing lever 150 to rotate clockwise around the pivot 113, whereby the switch trigger portion 151 is triggered. A remote control switch (not shown) sends a signal to the remote control device that the surge protector is tripping.

6 and 7 show a trip mechanism according to a second embodiment of the present invention, the structure of which is the same as described above except that two MOVs 200 are housed in the bracket 110. Thus, as shown in Fig. 7C, the terminals 210 of the two MOVs 220 are inserted into the slots 124 of the trip bar 120 and soldered to the trip bar 120 by the low temperature solder 400. Thus, when the temperature rises, even in some cases, even if the heat of the two MOVs 200 transmitted to the solder joints through the respective electrodes is not uniform, the mechanism acts on the same solder joint and the mechanism trips at the same time. Since the other portions of the second embodiment are the same as those of the first embodiment, the repeated description is omitted here.

According to the trip mechanism of the present invention, since the trip lever 120 is rotated in a direction away from the electrode 210 of the MOV 200 in the tripped state, the electrical distance between the trip lever 120 and the electrode 210 can be increased, and the distance is increased. The reliability of electrical insulation between the two.

Further, according to the trip mechanism of the present invention, since the slider 130 slides between the trip lever 120 and the electrode 210 of the MOV 200 in the trip state, and covers the electrode 210 of the MOV 200, the position is further improved. The electrical insulation strength between the trip bar 120 and the electrode 210.

In addition, according to the trip mechanism of the present invention, since the electrodes 210 of the two MO Vs 200 are welded at the same position of the same trip bar 120 by low-temperature solder, even when the temperature rises, the two MOVs 200 pass through the respective The heat transferred from the electrodes to the solder joints is inconsistent, but acts on the same solder joints, and the mechanism trips at the same time, thereby improving the reliability of the trip mechanism.

Further, according to the present invention, since the pivoting of the trip lever 120 and the swing of the swing lever 150 are triggered by the sliding of the slider 130, the structure of the entire trip mechanism can be simplified, the cost of the product can be saved, and the entire The reliability of the trip mechanism.

Although the present invention has been described in detail above with reference to the preferred embodiments of the present invention, it is understood that the invention is in no way limited to Various modifications, variations, and substitutions are made in the present invention. The present invention is intended to cover all such modifications, variations and alternatives, and the scope of the invention is defined by the appended claims and their equivalents.

Claims

Rights request

A tripping mechanism for a surge protector, the tripping mechanism comprising:

a bracket for accommodating at least one metal oxide varistor;

a trip bar pivotally disposed on the bracket and coupled to one of the electrodes of the metal oxide varistor by a low temperature solder,

It is characterized by:

The trip mechanism further includes a slider slidably disposed on the bracket between the first position and the second position and biased toward the trip position, in the normal working state, the sliding The block is held in the first position by the trip bar against the bias, and in the tripped state, sliding of the slider to the second position under the bias causes the The trip bar pivots in a direction away from the electrode of the metal oxide varistor.

2. The trip mechanism of claim 1 further comprising a rocker pivotally mounted on said bracket, said sliding of said slider to said second position will result in said pendulum The lever pivots to trigger the remote control switch.

3. The trip mechanism according to claim 1, wherein the slider is provided with a state indicating portion indicating a normal working state, and when the slider is in the first position, the state indicating Portions can be viewed from the outside through openings or transparent windows that are placed on the surge protector housing.

4. The trip mechanism according to claim 3, wherein a state indicating portion indicating a trip state is provided on the bracket, and in the first position, the state indicating portion indicating a trip state A state indicating a normal operating state disposed on the slider is partially occluded, and in the second position, the state indicating portion indicating the trip state is exposed and can be disposed on the surge protector housing The opening or transparent window is viewed from the outside.

5. The trip mechanism of claim 1, wherein the slider comprises an inclined surface, and in the first position, the trip bar is against the inclined surface.

6. The trip mechanism of claim 5, wherein in the second position, the slider is between the electrode and the trip bar.

The trip mechanism according to claim 6, wherein a channel is provided on a lower side of the inclined surface, and in the second position, the electrode is housed in the channel.

8. The trip mechanism of claim 1 further comprising one or more biases a spring, the biasing spring engaging one end of the slider and the other end engaging the bracket to bias the slider toward the second position.

9. The trip mechanism of claim 1 wherein a first end of the trip bar is pivotally coupled to the bracket and a second end of the trip bar is opposite the electrode welding.

10. The trip mechanism of claim 9, wherein the second end of the trip bar is formed with a slot into which the electrode is inserted and soldered.

The trip mechanism according to any of the preceding claims, wherein two metal oxide varistor are housed in the holder, and the respective electrodes of the two metal oxide varistor are welded in the same The same position of the buckle.

A surge protector, characterized in that the surge protector comprises at least one metal oxide varistor and the trip mechanism according to any one of claims 1 to 11.