An indicating device for an excitation protection device

Abstract

An indicating device for an excitation protection device, the excitation protection device comprising a housing, an excitation source, an impact device and a conductor; the indicating device is arranged on the housing; the indicating device includes a convex-shaped cavity opened on the housing and an indicating body arranged in the cavity; the initial position of the indicating body is defined by a second limiting structure, and the end position is defined by a first limiting structure and a second limiting structure; the fluid generated by the excitation source is conveyed to the indicating body through a flow channel communicated with the cavity, driving the indicating body to move from the initial position to the end position. At the end position, the ejecting end of the indicating body extends out of the housing. The indicating device of the present invention has a simple structure and reliable operation.

Description

Technical Field

[0001] The present invention relates to the fields of power control and electric vehicles, and in particular to an indicating device in an excitation protection device that disconnects a conductor step by step through an excitation source for current interruption. Background Art

[0002] At present, in addition to traditional thermal fuses, there already exists a structure for quickly cutting off a circuit in electric vehicle battery pack protection devices, namely an excitation protection device, and its application range is gradually expanding. Its main purpose is to overcome the deficiencies of traditional fuses, such as large heat generation, high power consumption, large volume and weight, limited anti-current impact ability, long breaking time, and uncontrolled breaking process.

[0003] The general structure of an excitation protection device consists of a housing, in which an excitation source, an impact device, and a conductor are sequentially arranged, and a pre-breaking port is arranged on the conductor. Its working principle: The excitation protection device is connected in series in the circuit to be protected. When the circuit needs to be disconnected, the excitation source in the excitation protection device is triggered, and the excitation source acts to generate high-pressure gas, which pushes the impact device downward to break the pre-breaking port of the conductor, forming a physical break on the conductor. The arc generated at the conductor break gradually cools and extinguishes in the air until it cannot conduct current. Since the conductor of the excitation protection device is connected in series in the circuit, the current in the circuit is cut off and the circuit is disconnected.

[0004] No indicating device for indicating the completion of the action of the excitation protection device is provided in the excitation protection device, and it is impossible to know whether the excitation protection device has acted in the first place, which is not conducive to maintenance inspection and replacement. Summary of the Invention

[0005] In view of the above deficiencies, the present invention adds an indicating device to the excitation protection device. After the excitation protection device completes its action, the indicating device protrudes outside the housing to indicate the completion of the action, so as to remind maintenance personnel that they can timely discover the action of the device during maintenance, facilitating maintenance and replacement.

[0006] To achieve the above technical objectives, the technical solution provided by the present invention is an indicating device for an excitation protection device. The excitation protection device includes a housing, an excitation source, an impact device, and a conductor; the indicating device is arranged on the housing; the indicating device includes a convex-shaped cavity opened on the housing and an indicating body arranged in the cavity; the initial position of the indicating body is limited by a second limiting structure, and the termination position is limited by a first limiting structure and the second limiting structure; the fluid generated by the excitation source is conveyed to the indicating body through a flow channel communicated with the cavity, driving the indicating body to move from the initial position to the termination position. At the termination position, the ejecting end of the indicating body extends outside the housing.

[0007] Preferably, the cavity includes a large-sized chamber and a narrow channel structure communicating with the outside of the housing, and the narrow channel structure communicates with the large-sized chamber; the indicating body includes a large-sized portion and a small-sized portion integrally connected thereto, and the small-sized portion is a pushing end near one end outside the housing; the large-sized portion of the indicating body is located in the large-sized chamber of the cavity, and there is a displacement gap between the side wall connected to the narrow channel structure, and the pushing end of the indicating body is located in the narrow channel structure; the inner wall of the large-sized chamber of the cavity at the end connected to the narrow channel structure forms a first limiting structure for preventing the indicating body from being completely pushed out of the housing against the large-sized portion of the indicating body.

[0008] Preferably, the indicating body is formed by folding a long strip of elastic metal sheet in half and bending it. A diamond structure is formed at the bending connection as the large-sized portion, and arrowhead structures are formed by bending at both ends near the long strip of metal sheet as the pushing ends; in the initial position, the diamond structure is located in the large-sized chamber of the cavity and contacts the side wall of the chamber; the arrowhead structures are compressed and abutted to form a second limiting structure in the narrow channel structure.

[0009] Preferably, barbs are provided on both sides of the pushing end of the indicating body. In the initial position, the barbs are compressed and abutted to form a second limiting structure in the narrow channel structure.

[0010] Preferably, a second limiting structure is provided on the side wall of one side of the large-sized chamber of the cavity, and the second limiting structure presses against the side wall of the large-sized portion of the indicating body to limit the initial position.

[0011] Preferably, an installation hole is provided on the side wall of one side of the large-sized chamber of the cavity, and a spring in a compressed state is installed in the installation hole. The spring presses against the side wall of the large-sized portion of the indicating body to limit the initial position; the spring forms a second limiting structure.

[0012] Preferably, an installation hole is provided on the side wall of one side of the large-sized chamber of the cavity, and a spring in a compressed state is installed in the installation hole. A card slot is provided on the side wall of the indicating body, and a push block is provided between the card slot and the spring. A convex block is provided at the position of the push block relative to the card slot and is clamped in the card slot; the card slot, the convex block, the push block and the spring form a second limiting structure.

[0013] Preferably, a push rod is integrally connected to the bottom of the large-sized portion of the indicating body, and a limiting convex block is provided on the outer peripheral surface of its small-sized portion; a spring is sleeved on the outer periphery of the push rod between the large-sized portion of the indicating body and the cavity wall on one side of the flow channel; in the initial position, the push rod is located in the flow channel, the limiting convex block is located at the inner wall on one side where the large-sized chamber of the cavity is connected to the narrow channel structure, and the spring is in a compressed state; the limiting convex block and the spring form a second limiting structure.

[0014] Preferably, a push rod is integrally connected to the bottom of the large-sized part of the indicator body, and a limiting protrusion is provided at the narrow channel structure at the outer peripheral opening of the shell, and the ejection end of the indicator body is located in the narrow channel structure and is limited by the limiting protrusion of the narrow channel structure; the push rod is located in the flow channel; a spring in a compressed state is provided between the side wall of one side of the large-sized chamber of the cavity and the side wall of the push rod; the limiting protrusion and the spring form a second limiting structure.

[0015] Preferably, a variable cross-section structure whose inner diameter gradually decreases from the inside to the outside of the shell is provided in the narrow channel structure, and in the initial position, the arrow head structure or the barb structure is located at the variable cross-section structure.

[0016] Preferably, the indicator adopts a striking color different from the color of the shell as the warning color.

[0017] Preferably, a switch for connecting an external indication circuit is arranged outside the housing, and after the indicating body is pushed out of the housing, it touches the switch to connect the indication circuit.

[0018] The indicating device of the excitation protection device of the present invention performs indicating action after all actions of the power device are completed. The structure is simple, and when a fault occurs, the fault situation can be grasped immediately through the indicating circuit, and maintenance, detection and replacement can be carried out in time. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] Figure 1 This is a schematic diagram of the cross-sectional structure of the excitation protection device in the initial position of Example 1.

[0020] Figure 2 In the first embodiment, when the initial position is Figure 1 Schematic diagram of the cross-sectional structure of the excitation protection device with the cross-sectional direction vertical.

[0021] Figure 3 This is a schematic diagram of the cross-sectional structure of the excitation protection device in Example 1 after the first impact device and the second impact device are both activated.

[0022] Figure 4 is Example 1, and Figure 3 A schematic diagram of the cross-sectional structure of the excitation protection device after the first impact device and the second impact device, which are perpendicular to the cross-sectional direction, are activated.

[0023] Figure 5 is embodiment 1, Figures 1 to 4 Schematic diagram of the structure of the second impact device.

[0024] Figure 6 is embodiment 1, Figures 1 to 4 Schematic diagram of the structure of the conductor and melt.

[0025] Figure 7 It is a schematic structural diagram of an indicating device, where a is the schematic structural diagram at the initial position and b is the schematic structural diagram at the termination position.

[0026] Figure 8 It is a schematic structural diagram of an indicating device, where a is the schematic structural diagram at the initial position and b is the schematic structural diagram at the termination position.

[0027] Figure 9 It is a schematic structural diagram of an indicating device, where a is the schematic structural diagram at the initial position and b is the schematic structural diagram at the termination position.

[0028] Figure 10 It is a schematic structural diagram of an indicating device, where a is the schematic structural diagram at the initial position and b is the schematic structural diagram at the termination position.

[0029] Figure 11 It is a schematic structural diagram of an indicating device, where a is the schematic structural diagram at the initial position and b is the schematic structural diagram at the termination position.

[0030] Figure 12 It is a schematic structural diagram of an indicating device, where a is the schematic structural diagram at the initial position and b is the schematic structural diagram at the termination position. Detailed implementation manners

[0031] For the above technical solutions, preferred embodiments are given and specifically described in combination with the drawings. The structural positional relationships mentioned in the present invention, such as up and down, left and right, above, below, left, right, forward, backward, etc., do not constitute limitations on the present invention.

[0032] Embodiment 1

[0033] Refer to Figures 1 to 6 , the housing, in this embodiment, includes an upper housing 102 and a lower housing 106 docked therewith. The contact surface between the upper housing and the lower housing 106 is kept sealed. The upper housing and the lower housing are made of insulating materials and can be formed in whole or in part by injection molding. A conductor 105 is passed through the contact surface between the upper housing and the lower housing. Both ends of the conductor are located outside the upper and lower housings respectively. When the excitation protection device is in use, both ends of the conductor can be connected in series to an external circuit to protect it. A plurality of cavities penetrating the contact surface of the upper and lower housings are respectively opened in the upper and lower housings. The conductor 105 is in a long strip plate-like structure. Limiting bumps 105a are provided at both side edges of the conductor, and the conductor is positioned by being clamped in the limiting grooves opened at the corresponding positions on the lower housing through the limiting bumps.

[0034] The upper housing 102 is a hollow housing with two cavities inside. The first cavity 102b is located in the middle of the upper housing, and the second cavity is arranged at the outer peripheral side of the first cavity at intervals. The second cavity 102c is a ring structure. A gas flow channel is arranged between the first cavity and the second cavity, and the first cavity and the second cavity are respectively communicated with the cavities of the lower housing. The conductor is arranged at the first cavity 102b.

[0035] A cavity for accommodating the excitation source 101 is opened at the top of the upper housing corresponding to the first cavity 102b, and the first cavity is completely communicated with the cavity for accommodating the excitation source. The excitation source 101 can be fixed on the upper housing by the in-mold injection molding method, or the excitation source 101 can be installed by arranging a stepped hole in the cavity, and the excitation source is fixed by arranging a pressing plate or a gland (not shown) on the upper housing. The excitation source and the cavity where it is located are in sealed contact. The excitation source can receive an external excitation signal and act to generate a driving force for driving the first impact device to move. In this embodiment, the excitation source is an electronic ignition device, which can be ignited according to the received excitation signal, and the chemical drugs inside it react instantaneously to release a large amount of high-pressure gas as the driving force.

[0036] The first impact device 103 is arranged in the first cavity 102b. A ring-shaped limit rib 103a is arranged on the top of the first impact device 103. The limit rib is clamped on the top of the first cavity 102b and contacts the inner wall of the top of the upper housing, forming a limit structure for limiting the initial position of the first impact device. The limitation of the initial position of the first impact device can also be realized by opening a groove on the cavity wall and arranging a convex block on the first impact device, so that the convex block is embedded in the groove. The top of the first impact device 103 is in sealed contact with the top of the upper housing. In the initial state, the gas flow channel between the first cavity 102b and the second cavity 102c can be blocked, and the first cavity 102b and the second cavity 102c are separated and not communicated. Only when the first impact device overcomes the limit of the limit rib and displaces towards the conductor direction, when the first impact device changes from contact to non-contact with the top of the upper housing, the gas flow channel is exposed, and the first cavity and the second cavity are communicated. A groove 103a is opened on the upper end surface of the first impact device, and the excitation source is located in the area where the groove 103a is located, ensuring that the high-pressure gas released by the excitation source first acts on the first impact device.

[0037] On opposite side walls of the first cavity 102b, there are limiting sliding grooves penetrating the contact surface of the upper and lower shells. At positions of the first impact device corresponding to the limiting sliding grooves, there are sliding blocks. The sliding blocks of the first impact device are embedded in the limiting sliding grooves to form a guiding device, which ensures that the first impact device linearly displaces along the limiting sliding grooves under the action of a driving force and prevents it from rotating. The first impact device is in sealed contact with the first cavity to prevent high-pressure gas from leaking through the gaps, causing a reverse force to hinder the movement of the first impact device or resulting in a decrease in the high-pressure gas pressure, affecting the movement of the second impact device.

[0038] The impact end of the first impact device can be a blade-like structure or a pointed structure. For example, a tapered contraction cross-section structure or other structures that are beneficial to increasing the force per unit area are also possible.

[0039] The conductor 105 is in a long strip plate-like structure. Refer to Figure 1 and Figure 6 , and at least one disconnection weak point 105b that reduces the structural strength of the conductor is provided on the conductor 105. The disconnection weak point can be a groove opened on the surface of the conductor, such as Figure 1 the V-shaped groove in, or a U-shaped groove, or a groove with other structures; it can also be several through holes spaced apart in the width direction of the conductor. As long as it can reduce the structural strength of the conductor and is beneficial to the disconnection of the impact device, it is acceptable. At a certain distance from both sides of the disconnection weak point 105b, there are bending weak points 105c. When the first impact device impacts the disconnection weak point of the conductor, the conductor disconnects from the disconnection weak point. After disconnection, under the action of the first impact device, it bends along the bending weak point, so that the bent parts of the disconnected conductor are respectively located on both sides of the first impact device.

[0040] The second impact device 104 is sleeved in the second cavity 102c, and the second impact device is in sealed contact with the second cavity. Refer to Figure 5 , in this embodiment, the second impact device 104 is in a circular ring structure, and notches 104a penetrating the impact end of the second impact device are respectively provided on opposite sides of the circular ring structure. When the second impact device displaces through the conductor, the conductor is located at the notch of the second impact device, so that the displacement of the second impact device will not have any impact on the conductor. A plurality of notches 104b are spaced apart at one end of the second impact device close to the excitation source. When the excitation source acts to drive the first impact device to act, as the first impact device displaces, the first cavity and the second cavity are communicated, and the high-pressure gas generated by the excitation source can enter the second cavity to drive the second impact device to displace. The second impact device can also be a circular ring structure of other shapes, such as an ellipse, a square, etc.

[0041] A fuse 107 is connected in parallel under the conductor. The fuse 107 is hermetically installed in the lower shell through the bottom cover 108. A support structure for supporting the fuse is provided on the bottom cover. Refer to Figure 6, the melt 107 has a spatial geometric shape and is bent and formed. The two ends of the melt are respectively connected to the parts outside the weak bending parts of the conductor 105. That is, after the conductor is disconnected, the two ends of the melt are located on both sides of the fracture. Several fusing weak parts and disconnection weak parts are provided on the melt. In this example, the fusing weak part is a narrow neck. As Figure 6 In, the main part of the melt 107 is arranged perpendicular to the conductor 105, so that the length direction of the melt straddles the conductor, and its two ends are located on both sides outside the width direction of the conductor. The purpose of this setting is that when the second impact device breaks the melt, it will not affect the conductor. In order to achieve the electrical connection between the melt and the conductor, the two ends of the melt connected to the conductor are respectively set as bent structures to realize the parallel connection between the melt and the conductor. The connection method between the melt and the conductor can be connected by bolt pressing, conductive elastic sheet connection, welding and other methods. A cavity communicating with the second cavity is provided on the lower shell to facilitate the second impact device to move to the melt to break the melt. The two sides of the part of the melt affected by the second impact device are supported by the lower shell to facilitate the second impact device to break the melt. A sealing cover 106a is arranged between the melt and the conductor. The sealing cover 106a is in a bowl shape. The space where the melt is located is sealed through the sealing cover, and a cavity for the disconnection part to slide down and the first impact device to displace after the conductor is disconnected is formed in the lower shell below the conductor through the sealing cover. An arc extinguishing medium is filled in the cavity where the melt is located, and the arc extinguishing medium is arc extinguishing sand or arc extinguishing gel.

[0042] An indicating device is also provided on the shell. See Figure 1 , the indicating device includes a cavity and an indicating body. A third cavity in a convex structure is provided in the upper shell outside the second cavity 102c. The third cavity includes a large-size chamber and a narrow-channel structure integrally connected to it. One end of the narrow-channel structure is open on the outer surface of the upper shell and communicates with the outside. The bottom of the large-size chamber is connected to the second cavity 102c through an air duct 102e. An indicating body 109 is press-fitted in the third cavity. In this embodiment, the indicating body 109 is in an inverted T shape. Its large-size part is press-fitted with the large-size chamber of the third cavity and is at the end connected to the air duct. In the initial position, there is a displacement gap between the large-size part of the indicating body and the side wall at the connection of the large-size chamber and the narrow-channel structure. One end of the small-size part of the indicating body is the ejection end, which is located in the narrow-channel structure in the initial position. The chamber wall of the large-size chamber of the third cavity connected to the narrow-channel structure forms a first limiting structure, and at the end position, the position of the large-size part of the indicating body is limited to prevent it from flying out of the shell. The press-fit between the large-size part of the indicating body and the large-size chamber of the third cavity forms a second limiting structure to limit the initial position of the indicating body and avoid misoperation of the indicating device and false indication.

[0043] The opening position of the air passage 102e at the second cavity 102c is such that when the second impact device 104 breaks the melt and is displaced to the dead center position, the opening of the air passage 102e at the second cavity 102c can be exposed. When the second impact device 104 is not displaced to the dead center position, the opening of the air passage 102e at the second cavity 102c is blocked by the second impact device.

[0044] Principle of the indicating device: When the first impact device and the second impact device are fully displaced in place, the opening of the air passage 102e at the second cavity 102c is exposed. High-pressure gas enters the third cavity through the air passage 102e, driving the indicating body 109 to overcome the frictional force of the interference fit so that the ejecting end of the indicating body extends out of the housing of the excitation protection device to connect the indicating circuit located outside the excitation protection device. The other end is still in interference fit in the third cavity, and the large-sized part of the indicating body is limited by the chamber wall of the third cavity to prevent it from flying out of the housing. The indicating circuit is connected through the indicating device to remind that a fault has occurred in the main circuit, indicating that the excitation protection device has completed the protection action and the main circuit needs to be repaired in time.

[0045] The purpose of setting the indicating device is to indicate the occurrence of a fault in the main circuit and the completion of the action of the excitation protection device. Therefore, the indicating device only needs to be connected to the cavity where the last-acting impact device is located through an air passage. When all the impact devices act simultaneously, the indicating device is connected to the cavity where one of the impact devices is located through an air passage. The opening position of the air passage of the indicating device in the cavity where the impact device is located needs to satisfy that the opening of the air passage of the indicating device can be exposed and the indicating device can act only after all the impact devices have completed their actions.

[0046] The indicating body, in addition to Figure 1 the T-shaped structure shown, can also have many other structural forms.

[0047] See Figure 7 , the indicating body 40 has an arrow structure. A metal sheet with an elastic long strip structure is folded in half along the length direction, and then the two sides of the folded and bent connection end are bent to form a diamond structure 41, which forms the large-sized part of the indicating body. The unconnected ejecting ends of the long strip structure are symmetrically bent respectively to form arrow head structures 42. The indicating body is formed by bending and processing an elastic long strip-shaped metal sheet. The bent diamond structure and arrow head structure are elastic respectively.

[0048] Correspondingly, when the third cavity structure is designed as a convex structure, the chamber at one end where the third cavity 43 communicates with the air passage is a large-size chamber, and the end connected to the outside of the housing is a narrow-channel structure with a smaller size. A first limiting structure is formed at the connection between the large-size chamber and the narrow-channel structure; a variable cross-section part 44 is arranged in the narrow-channel structure, and the structure of the variable cross-section part 44 is a variable cross-section structure that gradually shrinks from the inside of the housing to the outside of the housing. The arrowhead structure and the variable cross-section structure form a second limiting structure.

[0049] When assembling the indicator body 40, first flatten the rhombus structure along the direction of insertion, and insert it from the open end of the narrow channel outside the housing, so that the rhombus structure 41 is in the large-size chamber. Under the action of elastic force, the rhombus structure stretches out and returns to its original state to be in close contact with the large-size chamber; make the arrowhead structure 42 be at the variable cross-section part 44, and form a compression limit on the arrowhead structure 42 through the variable cross-section part to keep it in its initial position.

[0050] After the excitation source acts and drives all the impact devices to act, under the action of fluid pressure, the inverted triangle structure at the bottom of the rhombus structure of the indicator body is stressed, pushing the indicator body to overcome the second limiting structure and pushing the arrowhead structure out of the outside of the housing. Under the action of elastic force, the arrowhead structure bounces outwards to form a barbed structure, which is stuck at the opening of the narrow-channel structure on the outer surface of the housing, preventing the indicator body from falling back into the housing again. At the same time, due to the limiting action of the first limiting structure, the rhombus structure of the indicator body is stuck at the first limiting structure to prevent the indicator body from being disengaged from the housing, forming a termination stop position.

[0051] See Figure 8 , whose third cavity structure is the same as Figure 7 the structure, only the structure of the indicator body is different. In Figure 8 , the indicator body 45 is an inverted T-shaped structure. The outer peripheral surface of the large-size part of the indicator body is in close contact with the inside of the large-size chamber of the third cavity. A barbed structure 46 is arranged at the top end of the small-size part of the indicator body, and the barbed structure 46 has a certain elasticity. In the normal working state, the barbed structure 46 is located at the variable cross-section structure 44 of the narrow-channel structure after being squeezed to limit the indicator body. The barbed structure and the variable cross-section structure form a second limiting structure. When the barbed structure 46 of the indicator body is pushed out of the outside of the housing, the barbed structure opens under the action of elastic force and is stuck outside the opening of the third cavity on the outer peripheral surface of the housing to prevent the indicator body from falling back into the third cavity again. The large-size part of the indicator body is stuck on the inner wall of the large-size chamber to form a limit to prevent the indicator body from being disengaged from the housing.

[0052] See Figure 9 , which is another structural form of the indicator body. The shape of the third cavity is the same as Figure 7 and Figure 8The structure is different, and no variable cross-section structure is provided at the narrow channel structure. For the indicating body 48, a push rod 49 is integrally connected to the bottom of the large-size part of the indicating body 48. The push rod 49 extends into the air duct, and the ejection end of the small-size part of the indicating body 48 penetrates through the narrow channel structure located in the third cavity. A limiting bump 50 is provided at the inner wall of the large-size cavity where the indicating body is located to ensure that the indicating body is located inside the housing under normal working conditions. A spring 51 is provided on the outer periphery of the push rod at the bottom of the third cavity. The spring 51 is in a compressed state between the bottom of the large-size part of the indicating body and the bottom of the third cavity. The limiting bump and the spring form a second limiting structure.

[0053] After the indicating body is impacted by the fluid pressure, it overcomes the limitation of the limiting bump 50. Under the combined action of the fluid pressure and the spring force, the ejection end extends out of the housing. The large-size end of the indicating body is clamped at the inner wall where the large-size cavity is connected to the narrow channel structure, preventing the indicating body from being completely pushed out of the housing. At the same time, the bottom of the indicating device is supported by the spring 50 to prevent the indicating body from falling back into the housing.

[0054] See Figure 10 , at Figure 9 Based on the structure, improvements have been made. No limiting bump is provided on the indicating body, and a limiting bump 102e is provided at the opening of the third cavity on the outer peripheral surface of the housing. The end face of the ejection end of the indicating body is located at the end face of the limiting bump 102e inside the housing. A compression spring 52 is provided between one side of the push rod 49 and the side wall of the third cavity, and the side face of the indicating body is pressed tightly to further limit the indicating body. The limiting bump 102e and the compression spring form a second limiting structure.

[0055] After the indicating body is impacted by the fluid pressure, it overcomes the limitation of the limiting bump 102e. Under the action of the fluid pressure, the ejection end of the indicating device extends out of the housing. The large-size end of the indicating body is clamped at the inner wall where the large-size cavity is connected to the narrow channel structure, preventing the indicating body from being pushed out of the housing. The push rod 49 is displaced above the compression spring 52, and the compression spring 52 pops out to the other side of the third cavity under the action of the elastic force, so that the compression spring 52 is located between the opposite sides of the third cavity, forming a support for the indicating body to prevent the indicating body from falling back into the housing.

[0056] See Figure 11 , the indicating body and the third cavity structure are at Figure 7On the structural basis of the indicating body and the third cavity, a clamping groove 54 is provided on one side of the large-size end of the indicating body 53. An installation hole is provided on the cavity wall of the third cavity opposite to the clamping groove 54. A spring 55 is provided at the bottom of the installation hole. A push block 56 is provided between the spring 55 and the clamping groove 54. A convex block 57 matching the clamping groove 54 is provided at the position of the push block 56 relative to the clamping groove 54. The convex block 57 on the push block 56 abuts against the clamping groove 54 of the indicating body under the action of the spring 55 to limit the position of the indicating body. At this time, the spring 55 is in a compressed state. The clamping groove, the push block, and the spring form a second limiting structure.

[0057] After the indicating body is impacted by the fluid pressure, it overcomes the restrictions of the convex block 57 and the clamping groove 54. Under the action of the fluid pressure, the ejection end of the indicating body extends out of the shell. The large-size end of the indicating body is clamped at the inner wall where the large-size chamber is connected to the narrow channel structure, preventing the indicating body from being completely pushed out of the shell. The bottom of the indicating body is displaced above the push block 56, causing the push block 56 to lose its restriction. Under the elastic force of the spring 55, the push block 56 is displaced to the other side of the third cavity, forming a support for the indicating body through the push block 56 to prevent the indicating body from falling back into the shell.

[0058] See Figure 12 , on the Figure 11 On the basis of removing the push block, shortening the depth of the installation hole, and directly using the spring 58 arranged in the installation hole to abut against the side groove 59 of the indicating device 53 to form a position limit for the indicating body, a second limiting structure is formed.

[0059] After the indicating body is impacted by the fluid pressure, it overcomes the restriction of the spring 58 on the side of the indicating device. Under the action of the fluid pressure, the ejection end of the indicating body extends out of the shell. The large-size end of the indicating body is clamped at the inner wall where the large-size chamber is connected to the narrow channel structure, preventing the indicating body from being pushed out of the shell. The bottom of the indicating body is displaced above the installation hole. Under the elastic force, the end of the spring 58 in contact with the indicating body is displaced to the other side of the third cavity, forming a support for the indicating body to prevent the indicating body from falling back into the shell.

[0060] Figures 8 to 12 For the indicating body shown, during specific assembly, the upper shell 102 can be pre-set into two parts of the shell, either upper and lower or front and back. An indicating device chamber is provided in the two parts of the upper shell. First, the indicating body is assembled into the inner chamber of one part of the upper shell 102, and then the other part of the upper shell 102 is assembled to complete the assembly of the indicating body.

[0061] For the above-mentioned indicating body, the ejection end extending out of the shell is coated with a striking color different from the color of the shell as a warning color to remind that the protection device has actuated, the circuit has failed, and maintenance is required.

[0062] Alternatively, a microswitch is provided outside the housing. The microswitch is connected to an indicating circuit, and an alarm lamp or a horn for alarm is connected in the indicating circuit. When the indicating body extends outside the housing, the microswitch can be triggered to turn on the indicating circuit, and an alarm is made through the indicating circuit to remind that the circuit has a fault and needs to be repaired.

[0063] After all the impact devices have completed their actions, the indicating body moves, and under the action of gas pressure, it extends outside the housing for working indication, indicating that the circuit has a fault, the excitation protection device has operated, and the circuit needs to be repaired.

[0064] Embodiment 2

[0065] In the above Embodiment 1, the excitation source is an electronic ignition device capable of generating high-pressure gas; in this embodiment, the excitation source is a hydraulic device capable of receiving an external excitation signal. By receiving the excitation signal, high-pressure liquid is released, and the high-pressure liquid enters the cavity where the corresponding impact device is located through a liquid flow channel, that is, the air channel in the above embodiment, to drive the impact device to act. When a hydraulic device is used, the released high-pressure liquid must be insulating liquid. In the embodiment, only the type of the excitation source is changed, and the rest of the structure is the same as that in the above embodiment.

[0066] The air channel in the above embodiment and the liquid flow channel in this embodiment are uniformly defined as a flow channel in the present invention.

[0067] The operation principle of the above embodiments: When the excitation source receives the excitation signal and acts, the impact device is driven to act by high-pressure fluid to disconnect the conductor and the fuse in sequence, and then the indicating body is driven by the fluid pressure to overcome the limiting structure and extend outside the housing for indicating work.

Claims

1. An indicating device for an excitation protection device, the excitation protection device comprising a housing, an excitation source, an impact device and a conductor; characterized in that, The indicating device is arranged on the housing; the indicating device includes a first cavity in a convex shape formed on the housing, and an indicating body arranged in the first cavity; the second cavity where the impact device is located is communicated with the first cavity through a flow channel, and in the initial position, the impact device closes the flow channel; when the impact device is displaced to the dead center position, the flow channel is opened; The initial position of the indicating body is defined by a second limiting structure, and the terminal position is defined by a first limiting structure and the second limiting structure; the fluid generated by the excitation source is conveyed to the indicating body through a flow channel communicated with the cavity; when the excitation source receives an excitation signal and acts to release high-pressure fluid, after the high-pressure fluid drives the impact device to act and disconnect the conductor, the high-pressure fluid drives the indicating body to displace through the flow channel, releases the limitation of the second limiting structure, and enables the indicating body to move from the initial position to the terminal position. At the terminal position, the ejecting end of the indicating body extends out of the housing, and the first limiting structure and the second limiting structure define the terminal position of the indicating body.

2. The indicating device according to claim 1, characterized in that, The cavity includes a large-size chamber and a narrow-channel structure communicated with the outside of the housing, and the narrow-channel structure is communicated with the large-size chamber; the indicating body includes a large-size part and a small-size part integrally connected thereto, and the small-size part is an ejecting end near one end outside the housing; the large-size part of the indicating body is located in the large-size chamber of the cavity, and there is a displacement gap between the side wall of the large-size part of the indicating body and the side wall connected to the narrow-channel structure, and the ejecting end of the indicating body is located in the narrow-channel structure; the inner wall of one end of the large-size chamber of the cavity connected to the narrow-channel structure forms a first limiting structure for preventing the indicating body from being completely pushed out of the housing with respect to the large-size part of the indicating body.

3. The indicating device according to claim 2, characterized in that, The indicating body is formed by folding a long strip of elastic metal sheet in half and bending it. A diamond structure is formed at the bending connection as the large-size part, and arrowhead structures are respectively bent at both ends near the long strip of metal sheet as the ejecting ends; in the initial position, the diamond structure is located in the large-size chamber of the cavity and contacts the side wall of the chamber; the arrowhead structures are compressed and abutted in the narrow-channel structure to form a second limiting structure.

4. The indicating device according to claim 2, characterized in that, Barb structures are arranged on both opposite sides of the ejecting end of the indicating body, and in the initial position, the barb structures are compressed and abutted in the narrow-channel structure to form a second limiting structure.

5. The indicating device according to claim 2, characterized in that, A second limiting structure is arranged on the side wall of one side of the large-size chamber of the cavity, and the second limiting structure presses against the side wall of the large-size part of the indicating body to define the initial position.

6. The indicating device according to claim 5, characterized in that, An installation hole is formed in the side wall of one side of the large-size chamber of the cavity, and a spring in a compressed state is installed in the installation hole. The spring presses against the side wall of the large-size part of the indicating body to define the initial position; the spring forms a second limiting structure.

7. The indicating device according to claim 6, characterized in that, A mounting hole is provided on a side wall of one side of the large-sized chamber of the cavity, a spring in a compressed state is installed in the mounting hole, a slot is provided on the side wall of the indicator body, a push block is provided between the slot and the spring, and a protrusion that is locked in the slot is provided on the push block at a position relative to the slot; the slot, the protrusion, the push block and the spring form a second limiting structure.

8. The indicating device according to claim 2, characterized in that, A push rod is integrally connected to the bottom of the large-sized part of the indicator body, and a limiting protrusion is arranged on the outer peripheral surface of the small-sized part thereof; a spring is sleeved on the outer periphery of the push rod between the large-sized part of the indicator body and the cavity wall located on one side of the flow channel; in the initial position, the push rod is located in the flow channel, the limiting protrusion is located on the inner wall on one side where the large-sized chamber of the cavity is connected to the narrow channel structure, and the spring is in a compressed state; the limiting protrusion and the spring form a second limiting structure.

9. The indicating device according to claim 2, characterized in that, A push rod is integrally connected to the bottom of the large-sized part of the indicator body, and a limiting protrusion is provided at the opening of the narrow channel structure at the outer periphery of the shell. The ejection end of the indicator body is located in the narrow channel structure and is limited by the limiting protrusion of the narrow channel structure; the push rod is located in the flow channel; a spring in a compressed state is provided between a side wall of one side of the large-sized chamber of the cavity and a side wall of the push rod; the limiting protrusion and the spring form a second limiting structure.

10. The indicating device according to claim 3 or 4, characterized in that, A variable cross-section structure whose inner diameter gradually decreases from the inside to the outside of the shell is provided in the narrow channel structure. In the initial position, the arrow head structure or the barb structure is located at the variable cross-section structure.

11. The indicating device according to any one of claims 1 to 10, characterized in that, The indicator adopts a striking color different from the color of the shell as a warning color.

12. The indicating device according to any one of claims 1 to 10, characterized in that, A switch for connecting an external indicating circuit is arranged outside the shell, and the indicating body touches the switch to connect the indicating circuit after being pushed out of the shell.

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