JP2018181819A - High voltage fuse with service plug function - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a small-sized and lightweight high voltage fuse with service plug function capable of easily and directly mounting and fixing a fuse to a holder in simple structure.SOLUTION: The present invention relates to a high voltage fuse with service plug function. In the high voltage fuse, a member consisting of a blade-like terminal part 11 with which one or more element parts 8 that are curved longer than a terminal interval distance are disposed in parallel in a center, of which the thickness is secured by folding both ends and which is folded in an U shape is inserted into a main body comprising a wide internal space 7 in which the element parts 8 are accommodated and a thin groove 10 into which the blade-like terminal part 11 is inserted, and including a handle 3 in an outside upper part. Thereafter, the internal space 7 is filled with an arc-extinguishing agent 9, and the member is fixed by covering the internal space with a lid. The blade-like terminal part 11 is structured to be electrically connected with a holder 2 including a clip-like terminal 16, thereby reducing component cost and manufacture cost.SELECTED DRAWING: Figure 5

Description

  The present invention provides a service plug having a function of shutting off an abnormal overcurrent in an automobile or the like having a high voltage circuit, and safely opening a circuit during a life rescue operation in an operation such as maintenance of the electric system or in an accident. The present invention relates to a high voltage fuse having a (power supply circuit interrupting device) function.

  The automobile market shows increasing demand for electric vehicles and plug-in hybrids by strengthening environmental regulations, and the electric system has high voltage and high capacity, and once an electric accident occurs, the damage is enormous. Although a voltage fuse is used, it is embedded and used in a service plug for securing safety in operations such as maintenance of an electric system in order to save the mounting space. As this kind of service plug, 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 right angles and assembled from the opening 51 of the main body plug, and the opening is covered with a plate-like cover. The circuit terminal 42 connected to the built-in fuse terminal 62 is accommodated, and the power supply circuit has a conductive state by the fuse terminal 62 and the circuit terminal 42 being fitted.

  Further, after incorporating a fuse connecting a pair of rod-like terminals from the opening of the first housing, the service plug shown in FIG. 11 covers the opening with a cover, and in the second housing While having a circuit terminal connectable with a pair of terminals, rib packing is provided between the cylindrical wall portion 72 of the second housing and the inner cylindrical wall 42 of the cover.

JP 2007-250386 A JP, 2011-090902, A

  The fuse incorporated in the service plug shown in FIG. 10 described above requires the terminal parts including the container and the base, and also requires the manufacturing of the fuse and the process of incorporating the fuse into the plug body, resulting in high part cost and manufacturing cost. In addition, there has been a problem that a special press-in jig is required not to deform the terminals when the fuse is assembled in the plug body.

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

  The fuse incorporated in the service plug shown in FIG. 11 mentioned above has the problem that the parts cost and the manufacturing cost become high as in FIG. 10, and further the process of penetrating the bolt into the tab of the fuse and attaching a pair of rod-like terminals is required. In addition, although conductor direct connection by a rod-like terminal can suppress connection resistance low and is useful in a circuit where a large current flows, there is a problem that parts cost and manufacturing cost become high because male and female terminals require high dimensional accuracy. When the first housing is removed, the circuit terminals are exposed too much, and it takes time and effort to cover the exposed terminal surfaces with insulating tape during maintenance work. Furthermore, special-shaped rib packings with a mountain-shaped cross section are used. As a result, there is a problem that a waterproof measure is required to close the gap between the first housing 3 and the second housing 7.

  Furthermore, the current charging capability in the event of a circuit accident due to the increase in battery voltage and capacity, which is the power supply for extending the distance and the rapid charging required for electric vehicles and hybrid cars in recent years, is greater. Although the fuse is required to be larger and heavier, the service plug shown in FIG. 10 and FIG. 11 has a problem that the size becomes large by incorporating the fuse in the housing.

  SUMMARY OF THE INVENTION An object of the present invention is to provide a compact and lightweight high-voltage fuse with a service plug function capable of easily attaching and fixing a fuse directly to a holder with a simple structure.

  The invention according to claim 1 for solving the above problems is that after arranging one or a plurality of element portions 8 curved in the center longer than the distance between the terminals in parallel in the center and turning back both ends to secure the thickness A body comprising a blade-like terminal 11 bent into a U-shape, having a wide internal space 7 for receiving the element 8 and a narrow groove 10 for receiving the blade-like terminal 11, and having a handle 3 at the outer upper part The high voltage fuse is filled with the arc extinguishing agent 9 into the internal space 7 and fixed by covering the lid 12 with the blade-like terminal portion 11 electrically connected to the holder 2 having the clip-like terminal 16. It is a high voltage fuse with a service plug function, which has a structure to be connected and reduced parts cost and manufacturing cost.

  The invention according to claim 2 is characterized in that the outer upper handle is provided with a movable mechanism which stands upright when taking out the fuse from the holder, and which rotates downward when 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 align the locking portion with the receiving portion of the holder, thereby preventing the fuse from being removed from the holder.

  The invention according to claim 3 has a step on the outer peripheral surface and a ring-shaped packing made of silicon resin in the step, and when the locking portion of the handle matches the receiving portion of the holder, the ring is formed. 3. A high voltage fuse with a service plug function according to claim 2, wherein the resilient portion of the packing is pressed against the receiving portion to prevent the locking portion from being detached from the holder and has a waterproof function.

  In the invention according to claim 4, the outer peripheral surface of the fuse is in close contact with the inner peripheral surface of the holder, and when the fuse is attached to the holder, the inner surface of the holder serves as a guide for positioning. 4. A high voltage fuse with a service plug function according to claim 3, wherein said at least one terminal portion can be reliably inserted into the clip-like terminal of the holder.

  As described above, according to the first aspect of the present invention, as in the case of a fuse incorporated into a conventional service plug, the fuse is manufactured without requiring a base for the fuse and a housing part as the service plug. It is possible to reduce the number of processes and processes for incorporating the fuse into the housing.

  Furthermore, the housing members do not overlap and a wide internal space can be provided in the fuse, one or more curved elements longer than the distance between the terminals can be accommodated in parallel, and a large amount of arc extinguishing agent can be filled. As a result, the arc resistance generated after element melting is increased to improve the interrupting performance, and the increase in size as a service plug is suppressed even for high voltage and large current of the power supply, which is the needs of the automobile market, and weight reduction is achieved. be able to.

  Furthermore, the clip-like terminal in the holder according to the invention of claim 1 requires high dimensional accuracy to suppress the contact resistance as in the conventional rod-like terminal connection, which increases the cost of the member, and the spring connection Can be used in circuits where large current flows.

  According to the second aspect of the present invention, the rotatable handle at the top of the fuse is provided with the claw-like locking portion and the receiving portion on the outer side surface of the holder, and the handle is rotated when the power circuit is closed to make the claw-shaped locking portion By matching with the receiving part, it is possible to secure fixation so that the fuse does not come off from the holder against severe vibration and impact that occur in a car.

  According to the third aspect of the present invention, by providing the ring-shaped packing made of silicon resin or the like in the step portion of the fuse, it is possible to prevent the entry of water from the gap and to improve the waterproofness. In addition, after the claw-like locking part of the handle is aligned with the receiving part of the holder, the locking part is strongly pressed against the receiving part by the resilience of the ring-shaped packing so that the fuse does not come off the holder. Strong fixation can be ensured.

  According to the invention of claim 4, by positioning the outer peripheral surface of the fuse and the inner peripheral surface of the holder as a guide, narrow terminal penetrations having substantially the same cross section as the blade terminal portion of the fuse at the bottom surface of the holder The blade terminal can be reliably inserted into the hole and the clip-like terminal in the holder without damaging it, and the yield can be improved, and a special jig is not required, and furthermore, the fuse is formed by the narrow terminal through hole. At the time of maintenance work by removing the, the exposed terminal surface is extremely small, and safety can be improved.

It is a perspective view showing one embodiment before attaching a fuse of the present invention to a holder. It is a perspective view when the fuse shown in FIG. 1 is attached to a holder. It is a disassembled perspective view of the fuse shown by FIG. It is a disassembled perspective view of the holder shown by FIG. Figure 2 is a cross-sectional view of the fuse and holder shown in Figure 1; It is a longitudinal cross-sectional view when the fuse of this invention is mounted to a holder, The broken line is a figure which shows the state which latched the handle to the holder. It is a disassembled perspective view which shows another embodiment which has multiple element parts of the fuse of this invention. It is a cross-sectional view which shows another embodiment which inserted the element part and the blade-like terminal part integral member from the bottom part from the bottom face of the fuse of this invention. FIG. 7 is a cross-sectional view of yet another embodiment of the fuse of the present invention. It is sectional drawing which shows an example of the conventional power supply circuit interruption | blocking apparatus (service plug). It is sectional drawing which shows another example of the conventional power supply circuit interrupting 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. The high voltage fuse with service plug function of the present embodiment is incorporated in a circuit for supplying power from a high voltage, large current output battery used in an electric car or a plug in hybrid, etc. to a load, and this power circuit is used as needed. Make it possible to open and close.

  As shown in FIG. 1 to FIG. 6, the high voltage fuse with service plug function comprises fuse 1 and holder 2.

  As shown in FIGS. 3, 5 and 7, the fuse 1 is curved at the center longer than the distance between the terminals to form one or a plurality of parallel arranged element portions 8, and both ends in the longitudinal direction are folded back After securing the thickness, after inserting the member into the member consisting of the blade-like terminal portion 11 bent in a U-shape and the narrow internal groove 7 into which the element portion 8 enters and the groove 10 into which the blade-like terminal portion 11 enters. The internal space 7 is filled with the arc extinguishing agent 9 and the lid 12 is covered to form the fuse 1.

  As shown in FIG. 1, it is erected at the top of the fuse 1 at the time of attachment / removal to the holder 2 as shown in FIG. 1, and as shown in FIG. And a handle 3 made of a material resistant to tracking and arc resistant.

  Further, as shown in FIG. 6, the handle 3 is provided with a hook-like locking portion 4 and has a protrusion 5 on the outer surface of the holder 2, and when it is matched with the locking portion 4 (shown by a broken line) The claws of the portion 4 are elastically deformed to have the receiving portion 6 which fits over the projection 5 and prevents the fuse 1 from coming off the holder 2.

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

  Further, as shown in FIG. 1, FIG. 5 and FIG. 6, there is a step 13 on the outer peripheral surface of the fuse 1 and a ring-like packing 14 made of silicon resin or the like is provided at this step.

  As shown in FIG. 4, FIG. 5 and FIG. 6, there is a step 15 on the inner peripheral surface of the holder 2, and by providing a ring-like packing 14 with the step 13 of the fuse 1, waterproofness is improved. After the claw-shaped locking portion 4 of the handle 3 is aligned with the receiving portion 6 of the holder 2, the locking portion 4 is strongly pressed against the receiving portion 6 by the resilience of the ring-shaped packing 14 and the fuse 1 is released from the holder 2 Things are more strongly prevented.

  Further, as shown in FIG. 4 and FIG. 5, the holder 2 has clip-like terminals 16 connecting the connecting wires 19 with the circuit by electrically connecting the blade-like terminal portions 11 of the fuse 1 from both sides with large contact surfaces. doing.

  When attaching the blade-like terminal portion 11 of the fuse 1 to the clip-like terminal 16 of the holder 2, through the narrow through hole 17 having substantially the same cross section as the blade-like terminal portion 11 where the clip-like terminal is minimally exposed. Although the connection is made, the blade-like terminal 11 has a positional relationship (dimension relationship) to reach the through hole 17 after the outer circumferential surface of the fuse 1 and the inner circumferential surface of the holder guide the insertion position. Can be inserted without hurting

  According to the high-voltage fuse with the service plug function of the above configuration, a large internal space 7 can be secured in the fuse 1 by enclosing the member consisting of the element portion 8 and the blade-like terminal portion 11 in the fuse 1. An element longer than the terminal distance and a sufficiently filled arc extinguishing agent secure a long creepage distance between the terminals after element cutting to increase the arc resistance, and the effect of cooling the arc by many arc extinguishing agents is enhanced and the interrupting performance As a result, it is possible to suppress the size increase as a service plug and achieve weight reduction even if the circuit is compatible with high voltage and large current. Moreover, after securing the thickness by folding back both ends in the longitudinal direction, the member and the terminal are not joined by bending the both ends of the element portion 8 into a U-shaped terminal portion 11 and the reliability is improved. Furthermore, by securing the thickness by folding back both ends in the longitudinal direction, the tip end portion of the blade-like terminal portion 11 has a round shape and is caught when inserted into the through hole 17 and the clip-like terminal 16 in the holder 2 You can wear it smoothly.

  According to the high voltage fuse with the service plug function of the above-described configuration, the process for incorporating the fuse into the service plug and the fuse components can be reduced as in the conventional product, and no special installation jig is required.

  As another embodiment, as shown in FIG. 8, a member consisting of an element portion 8 and a blade-like terminal portion 11 is inserted from the bottom of the fuse 1 main body, filled with an arc extinguishing agent, and then the bottom lid 20 is fitted. There is also something to do.

  Further, as shown in FIG. 9, by sandwiching the heat sink 21 in the middle of the element portion 8 and the blade-like terminal portion 11, the arc generated after element melting is cooled, and the material (element material, oxygen, It is also possible to suppress the ionization of the air constituent gas such as nitrogen, the arc extinguisher material), and improve the blocking performance. These above-described embodiments are merely representative of the present invention, and are not limited to the above-described embodiments. That is, without departing from the gist of the present invention, various modifications can be made, such as the shape of the element portion, the number and the attachment direction of the handle, and the withdrawal direction of the receiving terminal.

  In electric vehicles, hybrid cars and high-voltage equipment that have high-voltage, high-current electrical circuits, it is extremely rare for the fuses of the service plug to operate. The latter method is a comprehensive comparison of the parts cost of incorporating the fuse, the operation cost of incorporating the fuse, the operation cost of replacement, and the part cost of replacing the high voltage fuse with service plug function itself and the operation cost. Can significantly reduce the cost.

DESCRIPTION OF SYMBOLS 1 fuse 2 holder 3 handle 4 claw-like locking part 5 protrusion 6 receiving part 7 internal space 8 element part 9 arc extinguishing agent 10 narrow groove 11 blade-like terminal part 12 lid 13 fuse side step 14 ring-like packing 15 holder side step DESCRIPTION OF SYMBOLS 16 clip-like terminal 17 through-hole 18 handle shaft 19 connection electric wire with a circuit 20 bottom lid 21 heat sink

Claims (4)

  A member consisting of blade-like terminal portions 11 bent in a U-shape after arranging one or a plurality of element portions 8 curved at a distance longer than the terminal distance in the center in parallel and folding back both ends to secure the thickness. Is inserted into the main body having the handle 3 at the outer upper part, and then filling the inner space 7 with the arc extinguishing agent 9 A high voltage fuse which is fixed by covering a lid 12 and whose blade-like terminal portion 11 is electrically connected to a holder 2 having a clip-like terminal 16.   The handle on the outer upper side is erected when taking out the fuse from the holder, and provided with a movable mechanism that is rotationally moved downward when fixed to the holder (when the power circuit is closed) and provided with a locking portion to turn the handle 2. A high voltage fuse with a service plug function according to claim 1, wherein the locking portion is fitted to the receiving portion of the holder to prevent the fuse from coming off the holder.   A stepped portion is provided on the outer peripheral surface, and the stepped 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 locking portion is formed by the resilience of the ring-shaped packing. 3. The high voltage fuse with a service plug function according to claim 2, wherein the high voltage fuse has a waterproof function and prevents the holder from being pushed out of the holder.   The outer peripheral surface of the fuse is in close contact with the inner peripheral surface of the holder, and when the fuse is attached to the holder, the inner surface of the holder serves as a guide to position the blade terminal of the fuse as a clip-like terminal of the holder 4. The high voltage fuse with a service plug function according to claim 3, which makes it possible to securely insert into.

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