CN220382029U - On-board surge protector - Google Patents

Abstract

The on-board surge protector comprises a thermal separation elastic piece, a movable push rod, a conductive piece, a protection element, a remote signaling movable contact and a remote signaling fixed contact, wherein a low-temperature welding pin of the protection element is welded with the conductive piece through a hot-melt welding point, the welding point is used for blocking the thermal separation elastic piece to recover deformation through the push rod, the push rod comprises a partition part and a pushing part, and one end of the remote signaling movable contact is communicated with the remote signaling fixed contact; after the welding point is melted by heat, the heat separation elastic piece drives the push rod to move to the partition part to partition between the low-temperature welding pin and the conductive piece, and meanwhile, the remote signaling movable contact is disconnected with the remote signaling static contact under the pushing force of the pushing part of the push rod, and the on-board surge protector is switched from an on state to an off state. The push rod of the on-board surge protector is provided with the pushing part for pushing the remote signaling movable contact to be disconnected with the remote signaling fixed contact, so that the fault that the remote signaling contact is not operated due to the attenuation of elastic force is avoided, and the reliability of the remote signaling operation is improved.

Description

On-board surge protector

Technical Field

The utility model relates to the field of piezoelectric devices, in particular to an on-board surge protector.

Background

Surge protectors have become an integral part of industrial intelligent and informative applications as a safety device. With the vigorous development of new energy industry, the surge protector installed by the traditional guide rail is difficult to meet the application requirements of smaller volume and lower cost. To cope with this trend, on-board surge protectors have been developed. The remote signaling contacts of the existing on-board surge protector are separated completely by means of the elasticity, the reliability of breaking action is low by means of the elasticity of the remote signaling contact materials, and the reliability of remote contact degradation indication is low.

Disclosure of Invention

The utility model aims to overcome at least one defect of the prior art and provide the on-board surge protector which is simultaneously provided with a remote signaling triggering part and a forced breaking part and improves the reliability of remote signaling actions.

In order to achieve the above purpose, the utility model adopts the following technical scheme:

the on-board surge protector comprises a thermal separation elastic piece, a movable push rod, a conductive piece, a protection element, a remote signaling movable contact and a remote signaling fixed contact, wherein a low-temperature welding pin of the protection element is welded with the conductive piece through a hot-fusible welding point, the welding point is blocked by the push rod from recovering deformation of the thermal separation elastic piece, the push rod comprises a partition part and a pushing part, and one end of the remote signaling movable contact is communicated with the remote signaling fixed contact; after the welding point is melted by heat, the heat separation elastic piece drives the push rod to move to the partition part to partition between the low-temperature welding pin of the protection element and the conductive piece, and meanwhile, the remote signaling movable contact is disconnected with the remote signaling static contact under the pushing force of the pushing part of the push rod, and the on-board surge protector is switched from an on state to an off state.

Preferably, the push rod is provided with a supporting part, and one end of the remote signaling movable contact is elastically deformed under the acting force of the push rod supporting part to be communicated with the remote signaling static contact.

Preferably, the side wall of the partition part is provided with an introduction inclined plane.

Preferably, the movement of the push rod is linear movement, and the direction of the linear movement of the push rod is consistent with the elastic force direction of the heat release elastic piece.

Preferably, the thermal separation elastic piece is a compression spring; the partition part of the push rod is abutted above the welding point, the pushing part of the push rod is located right above the supporting part for supporting the remote signaling movable contact, a movable opening is formed between the pushing part and the supporting part, and one end of the remote signaling movable contact is arranged in the movable opening and is lapped on the supporting part.

Preferably, the push rod is provided with a mounting part attached to the supporting piece, the push rod is mounted on the supporting piece in a linearly movable manner, the mounting part is provided with a limiting groove, the thermal separation elastic piece is arranged in the limiting groove, one end of the thermal separation elastic piece is abutted to the bottom wall of the limiting groove, the other end of the thermal separation elastic piece is abutted to the indicating piece of the supporting piece, the indicating piece is positioned right above the limiting groove, one side of the mounting part is provided with a convex partition part, and the other side of the mounting part is provided with a convex supporting part and a pushing part.

Preferably, the push rod is in linkage connection with the indicator, one end of the indicator is bent to form an indicator part which is laminated on the indicator sheet of the support, and one end of the indicator is fixedly connected to the mounting part; when the on-board surge protector is switched from an on state to an off state, the push rod moves, the fixed end of the indicator moves synchronously, and the indicating part of the indicator moves away from the indicating piece of the support.

Preferably, the push rod moves rotationally, and the thermal separation elastic piece is a tension spring; the push rod is provided with a mounting part for rotating and mounting, the mounting part is connected to one end of the partition part, the side edge of the middle part of the partition part is abutted to one side of the welding point, the other end of the partition part is connected with one end of the thermal separation elastic piece, and the thermal separation elastic piece is obliquely arranged at the other side of the welding point.

Preferably, the installation department is the cylinder, and the axial is equipped with the pivot hole, and the pivot normal running fit on the support piece, the partition portion is sheet structure, and its bottom one side extends to the top of being connected with the installation department, and the bottom opposite side is connected with the pushing part, and the push rod is used for supporting the supporting part of remote signalling movable contact and is L shape structure, and the top is connected in the bottom of installation department, and the opening is towards the pushing part, has movable mouth with pushing part between, the one end of remote signalling movable contact is arranged in the movable mouth overlap joint on the supporting part.

Preferably, the support member is provided with an indication sheet and a first fixing column which are diagonally distributed, the top of the partition part extends to form an indication part which is laminated on the indication sheet, the top of the partition part is provided with a second fixing column, and two ends of the thermal separation elastic member are respectively hung on the first fixing column of the support member and the second fixing column of the push rod; when the on-board surge protector is switched from the on state to the off state, the push rod rotates, and the indication part on the push rod moves away from the indication sheet.

Preferably, the display device further comprises an indicator, a viewing window and an indicator sheet, wherein the indicator is provided with an indicator part with a mark color different from that of the indicator sheet; when the on-board surge protector is switched from an on state to an off state, the push rod moves, so that the indication part and the indication sheet are switched from being stacked at a position opposite to the observation window to being moved away from the observation window and being kept from the other.

The on-board surge protector is provided with the remote signaling trigger part and the forced breaking part, and the push rod is provided with the pushing part for pushing the remote signaling movable contact to be disconnected with the remote signaling static contact, so that the separation action is more reliable, the fault that the remote signaling contact does not act due to the attenuation of elastic force is avoided, and the reliability of the remote signaling action is improved. In addition, the isolating part of the push rod is isolated between the low-temperature welding pins of the protection element and the conductive piece, so that the arc generated in the disconnection process can be isolated, the arc extinction is easier, and meanwhile, the circuit isolation effect is realized.

Drawings

Fig. 1 is a front perspective view of an on-board surge protector of embodiment 1 of the present utility model;

fig. 2 is a front perspective view of the off-state on-board surge protector of embodiment 1 of the present utility model;

fig. 3 is a rear perspective view of the on-board surge protector of embodiment 1 of the present utility model;

fig. 4 is a rear perspective view of the off-state on-board surge protector of embodiment 1 of the present utility model;

fig. 5 is a schematic structural diagram of an on-board surge protector in embodiment 2 of the present utility model;

fig. 6 is a schematic structural diagram of an on-board surge protector in an off state according to embodiment 2 of the present utility model;

a support 1; an indicator piece 101; a guide projection 102; a rotation shaft 103; a first fixing post 104; an indicator 2; an instruction unit 201; a thermal release elastic member 3; a push rod 4; a partition 401; an introduction slope 4011; a mounting section 402; a limit groove 4021; a support portion 403; a pushing section 404; a movable port 405; a second fixing post 406; a conductive member 5; a protection element 6; soldering the pins 601 at low temperature; a remote signaling movable contact 7; a remote signaling stationary contact 8; a housing 9; a viewing window 901.

Detailed Description

The following examples are given in connection with the accompanying drawings to further illustrate specific embodiments of the on-board surge protector of the present utility model. The on-board surge protector of the present utility model is not limited to the description of the embodiments below.

As shown in fig. 1-6, the on-board surge protector of the utility model comprises a housing 9, a supporting piece 1, an indicating piece 2, a thermal separation elastic piece 3, a movable push rod 4, a conductive piece 5, a protecting element 6, a remote signaling movable contact 7 and a remote signaling fixed contact 8, wherein the supporting piece 1, the indicating piece 2, the thermal separation elastic piece 3, the movable push rod 4, the conductive piece 5, the protecting element 6, the remote signaling movable contact 7 and the remote signaling fixed contact 8 can be directly welded on a PCB board, and can be matched with an external circuit to finish remote degradation indication. The housing 9 is made of insulating heat-resistant material, and is provided with an observation window 901 for observing whether the internal components are normal. The protection element 6 includes a high temperature solder pin and a low temperature solder pin 601. The bottom pins of the conductive pieces 5 are used for connecting a PCB, the number of the conductive pieces 5 is two, one conductive piece 5 is welded with a high-temperature welding pin or is integrally formed with the high-temperature welding pin, the conductive piece 5 is made of a weldable brass or pure copper metal material, a force is applied to the other conductive piece 5 to enable the conductive piece 5 to be clung to a low-temperature welding pin 601 of the protection element 6, the two conductive pieces are firmly welded by using a low-temperature alloy material such as low-temperature alloy solder paste, a thermally fusible welding point is formed between the low-temperature welding pin 601 of the protection element 6 and the conductive piece 5, the welding point is prevented from recovering deformation by the push rod 4, the push rod 4 cannot move due to the resistance of the welding point, the thermally separable spring 3 is in a deformed state, and particularly, the push rod 4 comprises a partition part 401, a supporting part 403 and a pushing part 404, when the surge protector is in an on state, one end of the remote signaling movable contact 7 is elastically deformed under the action of the supporting part 403 of the push rod 4, and is communicated with the signaling fixed contact 8; when the protection element 6 is degraded or the excessive surge current causes the protection element 6 to generate heat, the welding point is melted, the thermal separation elastic piece 3 recovers deformation, the push rod 4 is driven to move to the separation part 401 to be separated between the low-temperature welding pin 601 of the protection element 6 and the conductive piece 5, the conductive piece 5 is separated from the low-temperature welding pin 601 of the protection element 6, so that the surge protector is cut off from a circuit, meanwhile, the remote signaling movable contact 7 is separated from the supporting part 403, and is disconnected from the remote signaling fixed contact 8 under the self elasticity and the pushing force of the pushing part 404 of the push rod 4, and the on-board surge protector is switched from the on state to the off state. The on-board surge protector is provided with the remote signaling trigger part and the forced breaking part, and the push rod 4 is provided with the pushing part 404 for pushing the remote signaling movable contact 7 to be disconnected with the remote signaling static contact 8, so that the separation action is more reliable, the fault that the remote signaling contact does not act due to the attenuation of elastic force is avoided, and the reliability of the remote signaling action is improved. In addition, the blocking part 401 of the push rod 4 blocks the arc generated in the disconnection process between the low-temperature welding pin 601 of the protection element 6 and the conductive member 5, so that the arc extinction is easier, and the circuit isolation function is realized.

As shown in fig. 1 to 6, the indicator 2 has an indication portion 201 of a different color from the mark of the indicator piece 101; when the on-board surge protector is switched from the on state to the off state, the push rod 4 moves so that the indication part 201 and the indication sheet 101 are switched from being stacked in a position facing the observation window 901 to being moved away from one of them and the other being held close to the observation window 901.

As shown in fig. 1-4, in the embodiment 1 of the on-board surge protector of the present utility model, the movement of the push rod 4 is a linear movement, and the direction of the linear movement of the push rod 4 is consistent with the elastic direction of the thermal separation elastic member 3. Specifically, the thermal separation elastic piece 3 is a compression spring; the partition part 401 of the push rod 4 is abutted above the welding point, the pushing part 404 of the push rod 4 is located right above the supporting part 403, a movable opening 405 for one end of the remote signaling movable contact 7 to move is arranged between the pushing part 404 and the supporting part 403, and one end of the remote signaling movable contact 7 is arranged in the movable opening 405 and is lapped on the supporting part 403. The push rod 4 adopts a linear movement mode, has simple structure, stable and reliable transmission and compact and reasonable overall layout.

As shown in fig. 3-4, the sidewall of the partition portion 401 in this embodiment is provided with a lead-in slope 4011, so that the partition portion 401 can conveniently enter between the low-temperature soldering pin 601 of the protection element 6 and the conductive member 5, and the conductive member 5 and the protection element 6 can be effectively isolated in the cutting process.

As shown in fig. 1-4, the support 1 of this embodiment is used for installing a push rod 4, a remote signaling movable contact 7 and a remote signaling fixed contact 8, as shown in fig. 1-2, the remote signaling movable contact 7 and the remote signaling fixed contact 8 are in an L-shaped rod structure, one end is used as a contact end, the other end is clamped into a clamping groove of the support 1, the remote signaling movable contact 7 is located in an opening of the L-shaped remote signaling fixed contact 8, the contact end of the remote signaling movable contact 7 is lapped on a supporting part 403 of the push rod 4 and is located under a pushing part 404 of the push rod 4, and the contact end of the remote signaling movable contact 8 is provided with an arc-shaped protrusion protruding towards the remote signaling movable contact 7 and is used for contacting with the remote signaling movable contact 7 and is located on one side below the pushing part 404 of the push rod 4. The push rod 4 is provided with a mounting part 402 attached to the support member 1, and is used for the push rod 4 to be mounted on the support member 1 in a linearly movable manner, specifically, the support member 1 is provided with a guide protrusion 102, the push rod 4 is provided with a guide groove in sliding fit with the guide protrusion 102, and the guide protrusion 102 and the guide groove cooperate to guide the push rod 4 to linearly move on the support member 1. The mounting portion 402 is provided with a limiting groove 4021, the thermal separation elastic piece 3 is arranged in the limiting groove 4021, one end of the thermal separation elastic piece is abutted to the bottom wall of the limiting groove 4021, the other end of the thermal separation elastic piece is abutted to the indicating piece 101 of the supporting piece 1, the indicating piece 101 is located right above the limiting groove 4021, one side of the mounting portion 402 is provided with a protruding partition portion 401, and the other side of the mounting portion 402 is provided with a protruding supporting portion 403 and a pushing portion 404. The structure layout is reasonable, and the transmission is simple and reliable.

Alternatively, the thermal release elastic member 3 may also use a tension spring, where the thermal release elastic member 3 is still placed in the limiting groove 4021, and one end of the thermal release elastic member is connected to the bottom surface of the supporting member 1, and the other end of the thermal release elastic member is connected to the top surface of the mounting portion 402.

In the working process of embodiment 1, when the protection element 6 is degraded or excessive surge current causes the protection element 6 to generate heat, the welding point is melted by heat, the thermal separation elastic piece 3 recovers to deform, and drives the push rod 4, the push rod 4 slides down along the guide protrusion 102 through the guide groove on the push rod 4, until the partition portion 401 is partitioned between the low-temperature welding pin 601 of the protection element 6 and the conductive piece 5, so that the conductive piece 5 is separated from the low-temperature welding pin 601 of the protection element 6, and the surge protector is disconnected from the circuit, meanwhile, the support portion 403 of the push rod 4 moves down, the remote signaling movable contact 7 is separated from the support portion 403, and the pushing portion 404 of the push rod 4 moves down to push the remote signaling movable contact 7, and the contact end of the remote signaling movable contact 7 is disconnected from the remote signaling stationary contact 8 downward under the self-elasticity and the pushing force of the pushing portion 404, and the on-board surge protector is switched from the on state as shown in fig. 1 to the off state as shown in fig. 2.

As shown in fig. 1-4, the indicator 101 of the present embodiment is disposed on the support 1, the push rod 4 is connected with the indicator 2 in a linkage manner, one end of the indicator 2 is bent to form an indicator portion 201 stacked on the indicator 101 of the support 1, and one end of the indicator 2 is fixedly connected to a side wall of the mounting portion 402 and is located above the pushing portion 404; when the on-board surge protector is switched from the on state to the off state, the push rod 4 moves, the fixed end of the indicator 2 moves synchronously, the indicator 201 of the indicator 2 is straightened, and the indicator 201 of the indicator 2 moves away from the indicator piece 101 of the support 1. The indicator 2 of the present embodiment may employ a flexible indicator strip. The indicator piece 101 and the indicator portion 201 of the present embodiment are provided with different mark colors, for example, the indicator portion 201 is provided with green and the indicator piece 101 is provided with red. In the on state, the observation window 901 of the housing 9 appears green; when the on-board surge protector is switched from the on state to the off state, the indication portion 201 of the indicator 2 is separated from the position of the observation window 901, and the observation window 901 is seen to be red from the outside.

As shown in fig. 5-6, in embodiment 2 of the on-board surge protector of the present utility model, the supporting member 1 of the present embodiment is configured to mount the push rod 4, the remote signaling movable contact 7 and the remote signaling fixed contact 8, where the remote signaling fixed contact 8 is in a rod-shaped structure, two ends of the remote signaling fixed contact 8 are respectively limited on the supporting member 1 and located at the front side below the pushing portion 404 of the push rod 4, the remote signaling movable contact 7 is in a spring structure located below the remote signaling fixed contact 8, one end is a contact end for contacting with the remote signaling fixed contact 8, and the other end is limited on the supporting member 1 and located directly below the pushing portion 404 of the push rod 4. The push rod 4 of the embodiment rotates, and the thermal separation elastic piece 3 of the embodiment is a tension spring; the push rod 4 is provided with a mounting part 402 for rotating and mounting, the mounting part 402 is connected to one end of the partition part 401, the middle side edge of the partition part 401 is abutted to one side of the welding point, the other end of the partition part 401 is connected with one end of the thermal separation elastic piece 3, and the thermal separation elastic piece 3 is obliquely arranged on the other side of the welding point. The mode of driving the push rod 4 to rotate is realized by adopting the tension spring which is obliquely arranged in the embodiment, so that the structure of the push rod 4 is simplified, and the installation is convenient. Of course, torsion springs or compression springs can be used to drive the push rod 4 to rotate.

In this embodiment, the mounting portion 402 is a cylinder, a rotating shaft hole is axially provided and is in running fit with the rotating shaft 103 on the support member 1, the partition portion 401 is of a square sheet structure, one side of the bottom end of the partition portion extends to be connected with the top end of the mounting portion 402, the other side of the bottom end of the partition portion is connected with the pushing portion 404, the support portion 403 is of an L-shaped structure, the top end of the partition portion is connected with the bottom end of the mounting portion 402, an opening faces the pushing portion 404, a movable opening 405 for allowing one end of the remote signaling movable contact 7 to move is formed between the partition portion and the pushing portion 404, and one end of the remote signaling movable contact 7 is arranged in the movable opening 405 and is lapped on the support portion 403.

The indicator 2 of the embodiment is arranged on the push rod 4, the push rod 4 is rotatably arranged on the support 1, the support 1 is provided with the indicator 101 and the first fixing columns 104 which are diagonally distributed, one side of the top of the partition 401 extends to form the indicator 201 which is stacked on the indicator 101, the other side of the top of the partition 401 is provided with the second fixing columns 406, and two ends of the thermal separation elastic member 3 are respectively hung on the first fixing columns 104 of the support 1 and the second fixing columns 406 of the push rod 4; when the on-board surge protector is switched from the on state to the off state, the push rod 4 rotates, and the indication part 201 on the push rod 4 moves away from the indication sheet 101. The indicator piece 101 and the indicator portion 201 of the present embodiment are provided with different mark colors, for example, the indicator portion 201 is provided with green and the indicator piece 101 is provided with red. In the on state, the observation window 901 of the housing 9 appears green; when the on-board surge protector is switched from the on state to the off state, the indication part 201 on the push rod 4 is separated from the position of the observation window 901, and the observation window 901 is observed to be red from the outside.

In the working process of embodiment 2, when the protection element 6 is degraded or the excessive surge current causes the protection element 6 to generate heat, the welding point is thermally melted, the thermal separation elastic member 3 recovers to deform, the push rod 4 is driven to rotate clockwise, the separation part 401 separates between the low-temperature welding pin 601 of the protection element 6 and the conductive member 5, the conductive member 5 is separated from the low-temperature welding pin 601 of the protection element 6, so that the surge protector is disconnected from the circuit, meanwhile, the support part 403 of the push rod 4 rotates to generate downward and leftward displacement, the remote signaling movable contact 7 is separated from the support part 403, and the pushing part 404 of the push rod 4 rotates to generate downward and leftward displacement, so that the contact end of the remote signaling movable contact 7 is pushed to be disconnected from the remote signaling fixed contact 8 downwards under the self elastic force and the pushing force of the pushing part 404, and the on-board surge protector is switched from the on state shown in fig. 5 to the off state shown in fig. 6.

It should be noted that, in the description of the present utility model, the terms "upper", "lower", "left", "right", "inner", "outer", and the like indicate an orientation or a positional relationship based on that shown in the drawings or an orientation or a positional relationship conventionally put in use, and are merely for convenience of description, and do not indicate that the apparatus or element to be referred to must have a specific orientation, and thus should not be construed as limiting the present utility model. Furthermore, the terms "first," "second," "third," and the like are used merely to distinguish between descriptions and should not be construed as indicating relative importance.

The foregoing is a further detailed description of the utility model in connection with the preferred embodiments, and it is not intended that the utility model be limited to the specific embodiments described. It will be apparent to those skilled in the art that several simple deductions or substitutions may be made without departing from the spirit of the utility model, and these should be considered to be within the scope of the utility model.

Claims (11)

1. The utility model provides an on-board surge protector, includes heat break away from elastic component (3), movable push rod (4), electrically conductive piece (5), protection component (6), remote signaling movable contact (7) and remote signaling stationary contact (8), but through hot melt's welding point welding between low temperature welding pin (601) and the electrically conductive piece (5) of protection component (6), the welding point is through push rod (4) blocking heat break away from elastic component (3) and resumes deformation, its characterized in that: the push rod (4) comprises a partition part (401) and a pushing part (404), and one end of the remote signaling movable contact (7) is communicated with the remote signaling static contact (8); after the welding point is melted by heat, the heat separation elastic piece (3) drives the push rod (4) to move to the separation part (401) to separate between the low-temperature welding pin (601) of the protection element (6) and the conductive piece (5), and meanwhile, the remote signaling movable contact (7) is disconnected with the remote signaling static contact (8) under the pushing force of the pushing part (404) of the push rod (4), and the on-board surge protector is switched from the on state to the off state.

2. The on-board surge protector of claim 1, wherein: the push rod (4) is provided with a supporting part (403), and one end of the remote signaling movable contact (7) is elastically deformed under the acting force of the supporting part (403) of the push rod (4) to be communicated with the remote signaling fixed contact (8).

3. The on-board surge protector of claim 1, wherein: the side wall of the partition part (401) is provided with an introduction inclined surface (4011).

4. An on-board surge protector according to any one of claims 1-3, characterized in that: the push rod (4) moves linearly, and the direction of the linear movement of the push rod (4) is consistent with the elastic direction of the heat release elastic piece (3).

5. The on-board surge protector of claim 4, wherein: the thermal separation elastic piece (3) is a pressure spring; the isolating part (401) of the push rod (4) is abutted above the welding point, the pushing part (404) of the push rod (4) is located right above the supporting part (403) for supporting the remote signaling movable contact (7), a movable opening (405) is formed between the pushing part and the supporting part (403), and one end of the remote signaling movable contact (7) is arranged in the movable opening (405) and is lapped on the supporting part (403).

6. The on-board surge protector of claim 5, wherein: the push rod (4) has installation department (402) of laminating mutually with support piece (1) for but push rod (4) linear movement installs on support piece (1), be equipped with spacing groove (4021) on installation department (402), in spacing groove (4021) was arranged in to thermal release elastic component (3), one end butt in the diapire of spacing groove (4021), the other end butt in indicator piece (101) of support piece (1), indicator piece (101) are located directly over spacing groove (4021), one side of installation department (402) is equipped with convex partition portion (401), and the opposite side is equipped with convex supporting part (403) and pushing part (404).

7. The on-board surge protector of claim 6, wherein: the push rod (4) is connected with the indicator (2) in a linkage way, one end of the indicator (2) is bent to form an indicator part (201) which is laminated on the indicator sheet (101) of the support (1), and one end of the indicator (2) is fixedly connected to the mounting part (402); when the on-board surge protector is switched from an on state to an off state, the push rod (4) moves, the fixed end of the indicator (2) moves synchronously, and the indicator part (201) of the indicator (2) moves away from the indicator piece (101) of the support (1).

8. An on-board surge protector according to any one of claims 1-3, characterized in that: the push rod (4) moves in a rotating way, and the thermal separation elastic piece (3) is a tension spring; the push rod (4) is provided with a mounting part (402) for rotating and mounting, the mounting part (402) is connected to one end of the partition part (401), the middle side edge of the partition part (401) is abutted to one side of the welding point, the other end of the partition part (401) is connected with one end of the thermal separation elastic piece (3), and the thermal separation elastic piece (3) is obliquely arranged on the other side of the welding point.

9. The on-board surge protector of claim 8, wherein: the installation department (402) is the cylinder, and the axial is equipped with the pivot hole, and with pivot (103) normal running fit on support piece (1), partition portion (401) are sheet structure, and its bottom one side extends to be connected with the top of installation department (402), and the bottom opposite side is connected with pushing part (404), and supporting part (403) that push rod (4) are used for supporting remote signalling movable contact (7) are L shape structure, and the top is connected in the bottom of installation department (402), and the opening is towards pushing part (404), has movable mouth (405) with pushing part (404) between, the one end of remote signalling movable contact (7) is arranged in movable mouth (405) overlap joint on supporting part (403).

10. The on-board surge protector of claim 9, wherein: the support piece (1) is provided with indication sheets (101) and first fixing columns (104) which are diagonally distributed, the top of the partition part (401) extends to form an indication part (201) which is laminated on the indication sheets (101), the top of the partition part (401) is provided with second fixing columns (406), and two ends of the heat separation elastic piece (3) are respectively hung on the first fixing columns (104) of the support piece (1) and the second fixing columns (406) of the push rod (4); when the on-board surge protector is switched from an on state to an off state, the push rod (4) rotates, and the indication part (201) on the push rod (4) moves away from the indication sheet (101).

11. The on-board surge protector of claim 1, wherein: the display device further comprises an indicator (2), a viewing window (901) and an indicator sheet (101), wherein the indicator (2) is provided with an indicator part (201) with a mark color different from that of the indicator sheet (101); when the on-board surge protector is switched from an on state to an off state, the push rod (4) moves, so that the indication part (201) and the indication sheet (101) are switched from being stacked at a position opposite to the observation window (901) to being moved away from the observation window (901) and being held by the other.