JP6820462B2 - High voltage fuse with service plug function - Google Patents

Description

The present invention is a service plug having a function of cutting off an abnormal overcurrent in an automobile or the like having a high voltage circuit and safely opening a circuit during work such as maintenance of the electric system or lifesaving activity in the event of an accident. It relates to a high voltage fuse having a (power supply circuit breaker) function.

Due to the tightening of environmental regulations, the automobile market is showing increasing demand for electric vehicles and plug-in hybrids, etc., and the electric system has high voltage and high capacity, and once an electric accident occurs, the damage will be enormous. A voltage fuse is used, but it is incorporated in the service plug to ensure safety in work such as maintenance of the electrical system in order to save the mounting space. As a service plug of this kind, there is one shown in FIG. 10 or FIG.

In the service plug shown in FIG. 10, the terminal 62 of the fuse 61 is bent at a right angle and assembled from the opening 51 of the main body plug, and then the opening is covered with a plate-shaped cover, and the above-mentioned is described in the other circuit housing. The circuit terminal 42 connected to the built-in fuse terminal 62 is housed, and the power supply circuit is energized by fitting the fuse terminal 62 and the circuit terminal 42.

Further, in the service plug shown in FIG. 11, after incorporating a fuse connecting a pair of rod-shaped terminals from the opening of the first housing, the opening is covered with a cover, and the rod-shaped terminal is inside the second housing. It has a structure in which a circuit terminal that can be connected to a pair of terminals is provided, and a rib packing is provided between the cylinder wall portion 72 of the second housing and the inner cylinder wall 42 of the cover.

Japanese Unexamined Patent Publication No. 2007-250386 Japanese Unexamined Patent Publication No. 2011-090902

The fuse to be incorporated into the service plug shown in FIG. 10 described above requires terminal parts including its container and base, and also requires a process of manufacturing the fuse and incorporating the fuse into the plug body, resulting in high component cost and manufacturing cost. There is a problem, and there is a problem that a special press-fitting jig is required so as not to deform the terminal when the fuse is incorporated in the plug body.

Further, according to FIG. 10, the plug side terminal 62 and the circuit terminal 42 have a spring connection structure, and this spring member must give priority to the spring pressure and sacrifice conductivity in order to secure the close contact function between the terminals. As a result, there is a problem that ensuring conductivity is almost one-sided connection state, the conductor resistance becomes high, and it is not suitable for a circuit in which a large current flows.

The fuse to be incorporated into the service plug shown in FIG. 11 described above requires the problem of high component cost and manufacturing cost as in FIG. 10, and further requires a step of penetrating a bolt through the tab of the fuse to attach a pair of rod-shaped terminals. In addition, although direct conductor connection using rod-shaped terminals is useful in circuits where large currents flow because the connection resistance can be kept low, there is a problem that high dimensional accuracy is required for male and female terminals, resulting in high component costs and manufacturing costs. When the first housing is removed, the circuit terminals are exposed so much that it takes time to cover the exposed terminal surface with insulating tape during maintenance work. Furthermore, a rib packing with a mountain-shaped cross section is used. Therefore, there is a problem that a waterproof measure for closing the gap between the first housing 3 and the second housing 7 is required.

In addition, the current cutoff capacity in the event of a circuit accident due to the high voltage and capacity of the battery, which is the power source for quick charging and extending the cruising range required for electric vehicles and hybrid cars in recent years, is even greater. Although the fuses are required to be larger and heavier, the service plugs shown in FIGS. 10 and 11 have a problem that the size of the service plug is increased by incorporating the fuse in the housing.

Therefore, an object of the present invention is to provide a compact and lightweight high-voltage fuse with a service plug function that can be easily mounted and fixed directly to a holder with a simple structure.

The invention according to claim 1 for solving the above problems, a plurality of elements 8 which is one or parallel curved longer than pin spacing distance in the middle and folded in a U-shape by folding back the opposite ends a blade-like terminal portion 11, a high voltage fuse having a a body having a fine groove 10 and the handle 3 to the outer upper entering the wide internal space 7 and the blade-like terminal portions 11 for accommodating the element portion 8 The internal space 7 is filled with an arc-extinguishing agent 9, the lid 12 is fixed, and the blade-shaped terminal portion 11 is a high voltage with a service plug function that is electrically connected to a holder 2 having a clip-shaped terminal 16. It is a fuse.

According to the second aspect of the present invention, the upper outer handle is provided with a movable mechanism that stands upright when the fuse is taken out from the holder and rotates downward when the fuse is fixed to the holder (when the power supply circuit is closed). The high-voltage fuse with a service plug function according to claim 1, wherein a locking portion is provided, and the handle is rotated to match the locking portion with the receiving portion of the holder to prevent the fuse from coming off the holder.

The invention according to claim 3 has a step on the outer peripheral surface , the step portion has a ring-shaped packing made of silicon resin, and when the locking portion of the handle matches the receiving portion of the holder, the ring-shaped packing. The high-voltage fuse with a service plug function according to claim 2, which prevents the locking portion from being pressed against the receiving portion and coming off from the holder due to the repulsive elasticity of the above, and also has a waterproof function.

The invention according to claim 4 has a structure in which the outer peripheral surface of the fuse is in close contact with the inner peripheral surface of the holder, and the inner surface of the holder serves as a guide for positioning when the fuse is mounted on the holder. The high-voltage fuse with a service plug function according to claim 3, wherein the shaped terminal portion can be securely inserted into the clip-shaped terminal of the holder.

As described above, according to the invention of claim 1, unlike a fuse incorporated in a conventional service plug, a base for the fuse and a housing component as a service plug are not required, and the fuse is further manufactured. The process and the process of incorporating the fuse into the housing can be reduced.

Further, the housing members do not overlap, a wide internal space can be provided in the fuse, one or a plurality of curved elements longer than the terminal spacing distance can be housed in parallel, and a large amount of arc extinguishing agent can be filled. As a result, the arc resistance generated after the element is blown is increased to improve the breaking performance, and the size and weight of the service plug are suppressed even for the high voltage and large current of the power supply, which are the needs of the automobile market. be able to.

Further, the clip-shaped terminal in the holder according to the invention according to claim 1 requires high dimensional accuracy in order to suppress contact resistance like a conventional rod-shaped terminal connection, which increases the member cost and spring connection. It is possible to prevent the conductor resistance from becoming high and to use it in a circuit in which a large current flows.

According to the second aspect of the present invention, the rotatable handle on the upper part of the fuse is provided with a claw-shaped locking portion and a receiving portion on the outer side surface of the holder, and the handle is rotationally moved when the power supply circuit is closed to rotate the claw-shaped locking portion. By matching with the receiving part, it is possible to secure the fuse so that it will not come off from the holder against severe vibrations and shocks that occur in the automobile.

According to the third aspect of the present invention, by providing a ring-shaped packing made of silicon resin or the like on the stepped portion of the fuse, it is possible to prevent water from entering through the gap and improve the waterproof property. Also, after the claw-shaped locking part of the handle matches the receiving part of the holder, the locking part is strongly pressed against the receiving part due to the repulsive elasticity of the ring-shaped packing, and the fuse is doubled so that it does not come off from the holder. A strong fixation can be ensured.

According to the fourth aspect of the present invention, by positioning the outer peripheral surface of the fuse and the inner peripheral surface of the holder as guides, a narrow terminal penetration having substantially the same cross section as the blade-shaped terminal portion of the fuse on the inner bottom surface of the holder. The blade-shaped terminal can be securely inserted into the hole and the clip-shaped terminal in the holder without damaging the blade-shaped terminal, the yield can be improved, no special jig is required, and the narrow terminal through-hole allows the fuse. When the maintenance work is performed by removing the fuse, the exposed terminal surface is extremely small, and safety can be improved.

It is a perspective view which shows one Embodiment before mounting the fuse of this invention on a holder. It is a perspective view when the fuse shown in FIG. 1 is attached to a holder. It is an exploded perspective view of the fuse shown in FIG. It is an exploded perspective view of the holder shown in FIG. It is a cross-sectional view of the fuse and the holder shown in FIG. It is a vertical cross-sectional view when the fuse of the present invention is attached to the holder, and the broken line is a diagram showing a state in which the handle is locked to the holder. It is an exploded perspective view which shows another embodiment which has a plurality of element parts of the fuse of this invention. It is a cross-sectional view which shows still another embodiment which inserted the element part and the blade-shaped terminal part integrated member from the bottom part of the fuse of this invention. It is sectional drawing which shows still another embodiment of the fuse of this invention. It is sectional drawing which shows an example of the conventional power supply circuit cutoff device (service plug). It is sectional drawing which shows another example of the conventional power supply circuit cutoff device (service plug).

Hereinafter, a high voltage fuse with a service plug function according to an embodiment of the present invention will be described with reference to FIGS. 1 to 6. The high-voltage fuse with a service plug function of the present embodiment is incorporated in a circuit that supplies power from a high-voltage, high-current output battery used in an electric vehicle or a plug-in hybrid to a load, and this power supply circuit is incorporated as needed. Allows opening and closing.

As shown in FIGS. 1 to 6, the high-voltage fuse with a service plug function includes a fuse 1 and a holder 2.

As shown in FIGS. 3, 5 and 7, the fuse 1 is formed with one or a plurality of element portions 8 curved in the center longer than the terminal spacing distance and arranged in parallel, and both ends in the longitudinal direction thereof are folded back. After securing the thickness, after inserting the member into the member composed of the blade-shaped terminal portion 11 bent in a U shape, the wide internal space 7 in which the element portion 8 is inserted, and the narrow groove 10 in which the blade-shaped terminal portion 11 is inserted. , The internal space 7 is filled with the arc-extinguishing agent 9, and the fuse 1 is formed by covering the internal space 7 with the lid 12.

As shown in FIG. 1, the upper part of the fuse 1 is erected when it is attached to and removed from the holder 2, and as shown in FIG. 2, it has a movable function of rotating and moving when the power supply circuit is closed, and is heat resistant to polyamide resin or the like. The handle 3 is made of a material having strong tracking resistance and arc resistance.

Further, the handle 3 is provided with a claw-shaped locking portion 4 as shown in FIG. 6, and has a protrusion 5 on the outer surface of the holder 2, and is locked when matching with the locking portion 4 (shown by a broken line). The claw of the portion 4 is elastically deformed to have a receiving portion 6 that overcomes and matches the protrusion 5 to prevent the fuse 1 from coming out of the holder 2.

The holder 2 is provided with a clip-shaped terminal 16 having a wide contact surface for connection with the blade-shaped terminal 11 protruding from the bottom of the fuse 1.

Further, the outer peripheral surface of the fuse 1 has a step 13 as shown in FIGS. 1, 5 and 6, and a ring-shaped packing 14 made of silicon resin or the like is provided on the step portion.

The inner peripheral surface of the holder 2 has a step 15 as shown in FIGS. 4, 5 and 6, and a ring-shaped packing 14 is provided between the inner peripheral surface of the holder 2 and the step 13 of the fuse 1 to improve waterproofness. After the claw-shaped locking portion 4 of the handle 3 matches the receiving portion 6 of the holder 2, the locking portion 4 is strongly pressed against the receiving portion 6 by the repulsive elasticity of the ring-shaped packing 14, and the fuse 1 is disengaged from the holder 2. It is supposed to prevent this more firmly.

Further, as shown in FIGS. 4 and 5, the holder 2 has a clip-shaped terminal 16 that sandwiches the blade-shaped terminal portion 11 of the fuse 1 from both sides and electrically connects them with a large contact surface to connect the connecting electric wire 19 to the circuit. doing.

When the blade-shaped terminal portion 11 of the fuse 1 is attached to the clip-shaped terminal 16 of the holder 2, the blade-shaped terminal portion 11 has a narrow through hole 17 having substantially the same cross section as the blade-shaped terminal portion 11 that minimizes the exposure of the clip-shaped terminal. Although they are connected, after the outer peripheral surface of the fuse 1 and the inner peripheral surface of the holder guide the insertion position, the blade-shaped terminal portion 11 forms a positional relationship (dimensional relationship) to reach the through hole 17, and the blade-shaped terminal portion 11 is connected. Can be inserted without damaging.

According to the high-voltage fuse with a service plug function having the above configuration, a wide internal space 7 can be secured in the fuse 1 by housing the member including the element portion 8 and the blade-shaped terminal portion 11 in the fuse 1. , The element longer than the terminal spacing and a lot of filled arc extinguishing agent secure a long creepage distance between the terminals after the element is blown to increase the arc resistance, and the effect of cooling the arc is enhanced by a lot of arc extinguishing agent. By improving the above, it is possible to suppress the increase in size as a service plug and reduce the weight even in a circuit corresponding to a high voltage and a large current. Further, after the both ends in the longitudinal direction are folded back to secure the thickness, both ends of the element portion 8 are bent in a U shape to form the blade-shaped terminal portion 11, so that there is no joining work between the element and the terminal and the reliability is improved. By further folding both ends in the longitudinal direction to secure the thickness, the tip of the blade-shaped terminal portion 11 has a round shape, and when it is inserted into the through hole 17 and the clip-shaped terminal 16 in the holder 2, it is caught. Can be installed smoothly.

According to the high-voltage fuse with a service plug function having the above configuration, the process of assembling the fuse into the service plug and the fuse components can be reduced as in the conventional product, and a special assembling jig is not required.

Further, as another embodiment, as shown in FIG. 8, a member composed of an element portion 8 and a blade-shaped terminal portion 11 is inserted from the bottom surface of the fuse 1 main body, filled with an arc extinguishing agent, and then the bottom lid 20 is fitted into the fuse. Sometimes.

Further, as shown in FIG. 9, by sandwiching the heat sink 21 between the element portion 8 and the blade-shaped terminal portion 11, the arc generated after the element is blown is cooled, and the substance that is the source of the arc discharge (element material, oxygen, It is also possible to suppress ionization of air constituent gases such as nitrogen and arc-extinguishing agent materials to improve the blocking performance. These above-mentioned embodiments merely show typical embodiments of the present invention, and are not limited to the above-mentioned embodiments. That is, the shape of the element portion, the number of the element portions, the attachment direction of the handle, the pull-out direction of the receiving terminal, and the like can be variously modified without departing from the gist of the present invention.

In electric vehicles, hybrid cars, and high-voltage equipment that have high-voltage, high-voltage electric circuits, it is extremely rare for a fuse in a service plug to operate, and even if it does, a fuse in the plug will work. Comprehensively comparing the parts cost, the work cost for incorporating the fuse, the work cost for replacement, and the parts cost and work cost for replacing the high-voltage fuse with the service plug function, the latter method Can greatly reduce costs.

1 Fuse 2 Holder 3 Handle 4 Claw-shaped locking part 5 Protrusion 6 Receiving part 7 Internal space 8 Element part 9 Arc-extinguishing agent 10 Fine groove 11 Blade-shaped terminal part 12 Lid 13 Fuse side step 14 Ring-shaped packing 15 Holder side step 16 Clip-shaped terminal 17 Through hole 18 Handle shaft 19 Connection wire with circuit 20 Bottom lid 21 Heat sink

Claims (4)

One or juxtaposed plurality of element portion curved longer than pin spacing distance to the center (8),
A blade-shaped terminal portion (11) whose both ends are folded back and bent into a U shape ,
A body having a wide inner space (7) and the blade-like terminal portion for accommodating the element portion (8) and narrow grooves (10) of the start of (11) the handle (3) to the outer upper,
It is a high voltage fuse equipped with
The internal space (7) is filled with an arc-extinguishing agent (9), the lid (12) is fixed, and the interior space (7) is fixed.
The blade-shaped terminal portion (11) is a high-voltage fuse with a service plug function having a structure that electrically connects to a holder (2) having a clip-shaped terminal (16) . The upper outer handle is erected when the fuse is taken out of the holder, and is equipped with a movable mechanism that rotates downward when fixed to the holder (when the power supply circuit is closed) and a locking portion is provided to rotate the handle. The high-voltage fuse with a service plug function according to claim 1, wherein the locking portion is aligned with the receiving portion of the holder to prevent the fuse from coming off the holder. The outer peripheral surface is provided with a step, and the step portion has a ring-shaped packing made of silicone resin. When the locking portion of the handle matches the receiving portion of the holder, the locking portion receives due to the repulsive elasticity of the ring-shaped packing. The high-voltage fuse with a service plug function according to claim 2, which has a waterproof function while being pressed against a portion to prevent the fuse from coming off the holder. The outer peripheral surface of the fuse has a structure in close contact with the inner peripheral surface of the holder, and when the fuse is mounted on the holder, the inner surface of the holder serves as a guide for positioning, so that the blade-shaped terminal portion of the fuse becomes a clip-shaped terminal of the holder. The high-voltage fuse with a service plug function according to claim 3, which can be reliably inserted into the fuse.

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