JP6442237B2 - Fuse device with alarm function - Google Patents

Description

  The present invention relates to a fuse device with an alarm function that is used in a power distribution system or the like and issues an alarm to the outside when a fuse is blown.

  Japanese Patent Application Publication No. 2004-520686 (Patent Document 1) discloses a fuse device including a housing and a fuse holding cartridge that is removable with respect to the housing. The fuse holding cartridge holds a load protection fuse and an alarm fuse connected in parallel to the load protection fuse. In this fuse device, an alarm signal is transmitted when the load protection fuse is blown or when the fuse holding cartridge is removed from the housing (page 6, lines 41 to 42, etc.). In this fuse device, it is possible to easily replace the blown fuse by simply removing the fuse holding cartridge from the housing and replacing a new fuse holding cartridge.

Special table 2004-520686 gazette

  However, in the fuse device disclosed in Patent Document 1, the alarm signal is transmitted by a complicated electric circuit device formed between the housing and the fuse holding cartridge. For this reason, there existed a problem that the structure and manufacture of a fuse apparatus became complicated.

  An object of the present invention is to provide a fuse device with an alarm function having a structure in which a fuse holding cartridge is combined with a housing, and having a simplified structure and manufacturing.

  Another object of the present invention is to provide a fuse device with an alarm function that can visually check the state of an alarm fuse in a state where a fuse holding cartridge is combined with a housing.

  The fuse device with an alarm function of the present invention includes a housing and a fuse holding cartridge. The fuse holding cartridge forms a structural unit in combination with the housing, and removably holds the load protection fuse and the alarm fuse connected in parallel to the load protection fuse. The alarm fuse has a structure in which the rod member protrudes from the alarm fuse body when the alarm fuse is melted as a result of the load protection fuse being melted. When the housing and the fuse holding cartridge are combined to form the structure unit and the alarm fuse is not in a blown state, the alarm fuse is accommodated in the structure unit so as to surround the entire alarm fuse. . The housing and the fuse holding cartridge are configured such that when the alarm fuse is blown, the tip of the rod member protrudes through a rod member through hole provided in the housing or the fuse holding cartridge.

  If the fuse device is configured such that when the alarm fuse is in a blown state as in the present invention, the tip of the rod member protrudes through the rod member through hole provided in the housing or the fuse holding cartridge, the rod member protrudes. By issuing an alarm, it is possible to easily manufacture a fuse device with an alarm function that allows easy replacement of a fuse with a simple configuration without using a complicated electric circuit device as in the prior art.

  The fuse holding cartridge includes a first wall portion and a second wall portion and a third wall portion extending in a direction orthogonal to the first wall portion from both ends of the first wall portion, and the first to third walls. A structure in which a fuse holding structure portion for holding a load protection fuse and an alarm fuse is formed in a space surrounded by the third wall portion, and a rod member through hole is formed in the second wall portion or the third wall portion It can be. In this case, it is desirable that the housing has a structure for housing the fuse holding structure portion with the first wall portion to the third wall portion exposed. In this way, the fuse holding cartridge can be easily combined with the housing. Further, the mounting state of the fuse holding cartridge with respect to the housing can be easily confirmed.

  The alarm fuse is disposed between the load protection fuse and the first wall of the fuse holding cartridge, and the longitudinal dimension of the alarm fuse is longer than the longitudinal dimension of the load protection fuse. The load protection fuse and the alarm fuse can be held so that both ends of the alarm fuse cross over both ends of the load protection fuse. In this case, the first wall portion is provided with a knob at the longitudinal center position of the first wall portion, and a pair of inspection through holes is formed. A pair of inspection through-holes are provided on both sides of the knob in the longitudinal direction. When there is an alarm fuse, the position of the pair of inspection through-holes allows a part of the alarm fuse to be visually confirmed through the pair of inspection through-holes. However, when there is no alarm fuse, it is preferable that a part of the load protection fuse cannot be visually confirmed through the pair of inspection through holes. In this way, when there is an alarm fuse, the state of the alarm fuse can be visually confirmed through the pair of inspection through holes. Moreover, when using without using an alarm fuse, a desired operation | work can be performed with respect to the upper part of a housing through a pair of inspection through-hole.

  The second and third wall portions can be formed with lead wire insertion holes into which a pair of lead wires provided with terminal fittings are inserted. In this way, a pair of lead wires can be easily led out from the lead wire insertion hole.

  The housing can hold a pair of terminal fittings electrically connected to a pair of terminals provided at both ends of the load protection fuse. In this case, the pair of terminal fittings are preferably formed with screw holes into which screws are inserted by a driver inserted through the pair of inspection through holes when there is no alarm fuse. In this way, for example, when using a fuse device with an alarm function without using an alarm fuse, a pair of lead wires can be screwed to a pair of terminal fittings in a state where the fuse holding cartridge is combined with the housing.

  Preferably, the knob is further provided with an inspection through hole extending through the first wall. In this way, for example, when the alarm fuse is used without using it, the presence state of the load protection fuse can be visually confirmed.

  A plurality of slits penetrating the second wall portion or the third wall portion around the rod member through-hole provided in the second wall portion or the third wall portion with a predetermined interval in the circumferential direction. The plurality of slits are preferably formed such that the wall portions can be removed when the wall portions between the rod member through-holes and the plurality of slits are pressed with a predetermined force or more. If it does in this way, before using a fuse device with an alarm function, it can prevent that an operator etc. touches an alarm fuse with an operator by a wall part. And when using a fuse device with an alarm function, attach a switch part, etc. that generates an alarm signal by operating a rod member to the fuse device with an alarm function by pushing and removing the wall part with a predetermined force or more. Can do.

  For example, the mounting through-hole formed by removing the wall portion can be configured to have a shape that can be used as a mounting hole for a limit switch that includes an operated portion that is operated by a rod member. If it does in this way, an alarm signal can be emitted when a load protection fuse blows by turning on a limit switch with a rod member.

It is a perspective view of one embodiment of a fuse device with an alarm function of the present invention. It is the II-II sectional view taken on the line of FIG. It is a perspective view which shows the positional relationship of the load protection fuse in the state which combined the housing and fuse holding cartridge of the fuse apparatus with an alarm function shown in FIG. 1, an alarm fuse, and a pair of terminal metal fitting on a housing main body. It is the elements on larger scale of FIG. It is a perspective view which shows the state which attached the limit switch to the fuse apparatus with an alarm function shown in FIG.

  Hereinafter, an example of an embodiment of a fuse device with an alarm function of the present invention will be described in detail with reference to the drawings. FIG. 1 is a perspective view of an embodiment of a fuse device with an alarm function of the present invention, and FIG. 2 is a cross-sectional view taken along the line II-II of FIG. As shown in these drawings, the alarm-equipped fuse device 1 according to the present embodiment includes a housing 5 and a fuse holding cartridge 7 that constitute a structure unit 3.

  The housing 5 includes a housing main body 9 and a pair of rectangular wall-like portions 11A and 11B extending in parallel from the housing main body 9, and is integrally formed of synthetic resin. The housing body 9 has a rectangular parallelepiped shape having four wall portions 13, a wall portion 15, a wall portion 17, and a wall portion 19. A plurality of ribs 21, a pair of engaging portions 23 </ b> A and 23 </ b> B, and a central structure portion 24 are formed on the inner walls of the four wall portions 13, the wall portion 15, the wall portion 17, and the wall portion 19. One of the pair of engaging portions 23A and 23B is formed integrally with the adjacent rib 21 and separated from the adjacent wall portions 13 and 17, and a claw formed at the end of the leg portion 25. Part 27. A rail portion provided in the power distribution system is engaged with the claw portions 27 of the pair of engaging portions 23A and 23B. Thereby, the fuse device 1 with an alarm function is attached to the power distribution system.

  The central structure 24 includes a pair of vertical ribs 24A and 24B, a horizontal rib 24C connecting the pair of vertical ribs 24A and 24B, a cylindrical part 24D extending downward from the center of the horizontal rib 24C, and the vertical ribs 24A and 24B. A pair of lateral ribs 24E and 24F arranged on the sides of A through hole 24G is formed at the center of the cylindrical portion 24D. In addition, when a terminal fitting described later is screwed between the pair of ribs 21 and 21 located on one side of the central structure portion 24 and between the pair of ribs 21 and 21 located on the other side, respectively. A lateral rib 22 (FIG. 2) to be used is formed.

  On the upper ends of the pair of ribs 21 and 21 adjacent to the pair of leg portions 25 and 25, the pair of terminal fittings 29 are disposed on the lateral ribs 24 </ b> E and 24 </ b> F of the central structure portion 24. Is arranged. The pair of terminal fittings 29 are formed by pressing and bending metal plates, respectively. The terminal fitting 29 includes a plate-shaped attached portion 29A and a fitting terminal portion 29B. Two through holes 29a are formed in the attached portion 29A. Of the two through holes 29a, the inner through hole 29a is fitted into the protrusions provided on the lateral ribs 24E and 24F, and the terminal fittings 29 and 29 are fixed to the housing body 9. . The through-hole 29a located on the outer side of the two through-holes 29a is aligned with the through-hole for attaching the crimp terminal fitting L1 of the pair of lead wires L, and a wood screw (not shown) is inserted into both the through-holes. Screwed into the lateral rib 22. The outer through hole 29a may be a female screw hole. In this case, an ordinary screw may be used instead of a wood screw. The fitting terminal portion 29B includes a pair of leaf spring-like contact pieces 29b. One end of the pair of contact pieces 29b is provided integrally with the attached portion 29A and is bent in a direction approaching each other to exhibit springiness. Between the pair of contact pieces 29b, terminal portions 47 and 49 of a load protection fuse 39 described later are fitted and sandwiched.

  The fuse holding cartridge 7 is integrally formed of a synthetic resin and has a first wall portion 31 and a second wall extending from both end portions of the first wall portion 31 in a direction orthogonal to the first wall portion 31. And a knob 37 provided at a central position in the longitudinal direction of the first wall portion 31. The fuse holding cartridge 7 is detachably disposed with respect to the housing 5 in a space region surrounded by the pair of wall portions 11A and 11B of the housing 5. Specifically, the fuse holding cartridge 7 is attached to the housing 5 with the terminal portions 47 and 49 of the load protection fuse 39 held in the fuse holding cartridge 7 fitted and held in the pair of terminal fittings 29 described above. Become fixed. Therefore, when the fuse holding cartridge 7 is pulled out, the terminal portions 47 and 49 of the load protection fuse 39 are pulled out from the pair of terminal fittings 29.

  FIG. 3 is a perspective view showing the positional relationship between the load protection fuse 39, the alarm fuse 41, and the pair of terminal fittings 29 on the housing body 9 in a state where the housing 5 and the fuse holding cartridge 7 are combined. The configuration of the load protection fuse 39 and the alarm fuse 41 will be described with reference to this figure. The load protection fuse 39 includes a cylindrical load protection fuse main body 45 and terminal portions 47 and 49 provided on outer peripheral surfaces at both ends of the load protection fuse main body 45. The load protection fuse main body 45 is formed of ceramics, and a fuse element made of a fusible metal electrically connected to the terminal portion 47 and the terminal portion 49 is disposed therein.

  The alarm fuse 41 has a shape whose longitudinal dimension is longer than the longitudinal dimension of the load protection fuse 39. The alarm fuse 41 includes a cylindrical alarm fuse body 51 and terminal portions 53 and 55 provided on the outer peripheral surfaces of both ends of the alarm fuse body 51. The alarm fuse body 51 is formed of ceramics, and a fuse element made of a fusible metal electrically connected to the terminal portion 53 and the terminal portion 55 is disposed therein. The fuse element in the alarm fuse body 51 is set to be blown immediately when the fuse element in the load protection fuse 39 is blown and a current flows through the fuse element in the alarm fuse body 51. A hole 51 a for projecting the rod member 57 in the longitudinal direction of the alarm fuse body 51 is formed at one end of the alarm fuse body 51. The rod member 57 is configured to further protrude from the hole 51a when the alarm fuse 41 is melted as a result of the load protection fuse 39 being melted. The action of the rod member 57 protruding from the hole 51a will be described later. The terminal portions 53 and 55 of the alarm fuse 41 are electrically connected to the terminal portions 47 and 49 of the load protection fuse 39 by connecting conductors 59 and 61, respectively.

  The fuse holding structure 43 of the fuse holding cartridge 7 is configured to hold the load protection fuse 39 and the alarm fuse 41 so that both ends of the alarm fuse 41 exceed both ends of the load protection fuse 39. The fuse holding structure portion 43 includes a first holding structure portion 43 </ b> A that holds the load protection fuse 39 and a second holding structure portion 43 </ b> B that holds the alarm fuse 41. The first holding structure portion 43A supports the load protection fuse 39 so that the pair of terminal portions 47 and 49 of the load protection fuse 39 can be fitted to the pair of terminal fittings 29 and 29, and the load protection fuse 39 It is comprised by the some wall part 43a arrange | positioned so that it may control moving to a longitudinal direction and to control moving to the up-down direction of illustration. The second holding structure portion 43 </ b> B is configured by first to sixth wall portions 44 a to 44 f arranged at intervals in the longitudinal direction of the alarm fuse 41. The first wall portion 44a and the sixth wall portion 44f extend to some extent in the longitudinal direction of the alarm fuse 41, and the second to fifth wall portions 44b to 44e are width dimensions in the longitudinal direction of the alarm fuse 41. Is short. The cross-sectional shapes of the first to sixth wall portions 44 a to 44 f that are orthogonal to the longitudinal direction of the alarm fuse 41 have a U-shape that opens toward the wall-shaped portion 11 </ b> A of the housing 5. Further, the first wall portion 44 a and the second wall portion 44 b are connected on the load protection fuse 39 side in order to support the connection conductor 61. The connection conductor 61 is disposed so as to surround the lower wall portion of the second wall portion 44b. Further, the fifth wall portion 44e and the sixth wall portion 44f are coupled on the load protection fuse 39 side in order to support the connection conductor 59. The connection conductor 59 is disposed so as to surround the lower wall portion of the fifth wall portion 44e. The connection conductors 59 and 61 are joined to the terminal portions 53 and 55 in advance by welding or the like, respectively. Therefore, when the alarm fuse 41 is held by the second holding structure portion 43B, the first fuse holding cartridge 7 is removed from the state shown in FIG. 2 together with the terminal portions 53 and 55 from the rear side. A part of the alarm fuse is inserted between the sixth wall portions 44a to 44f.

  As shown in FIGS. 2 and 3, when the fuse holding cartridge 7 is combined with the housing 5, the load protection fuse 39 disposed in the fuse holding cartridge 7 has a pair of terminals 47 and 49 attached to the housing 5. The terminal fittings 29 are elastically fitted to the clip-shaped contact pieces 29b. As a result, the pair of lead wires L shown in FIG. 2 are electrically connected to each other via the load protection fuse 39, and the load protection fuse 39 and the alarm fuse 41 are connected in parallel.

  Returning to FIG. 2, the structure of the fuse holding cartridge 7 will be described again. Semi-circular lead wire insertion holes 33a and 35a are formed at the ends of the second and third wall portions 33 and 35 of the fuse holding cartridge 7, respectively. For this reason, the lead wire L fixed to the pair of terminal fittings 29 is led out through the lead wire insertion holes 33a and 35a.

  Three inspection through holes 31 a, 31 b, and 31 c are formed in the first wall portion 31 of the fuse holding cartridge 7. Of the three inspection through holes 31a, 31b, 31c, one inspection through hole 31a continuously penetrates the knob 37 and the first wall portion 31, and the two inspection through holes 31b, 31c. Are formed in the vicinity of both end portions in the longitudinal direction of the first wall portion 31 (on both sides of the knob 37 in the longitudinal direction of the first wall portion 31). For this reason, when there is the alarm fuse 41, a part of the alarm fuse 41 can be visually confirmed through the inspection through holes 31a, 31b, 31c. Further, the two inspection through holes 31b and 31c are set at positions where a part of the load protection fuse 39 cannot be visually confirmed through the inspection through holes 31b and 31c when the alarm fuse 41 is not provided. Therefore, for example, when using a fuse device with an alarm function without using the alarm fuse 41, a screw is inserted by a screwdriver inserted through the inspection through holes 31b and 31c, and the pair of terminal fittings 29 The crimp terminals L1 of the pair of lead wires L can be screwed into the through holes 29a.

  Further, a rod member through hole 33 b is formed in the second wall portion 33 of the fuse holding cartridge 7. As a result, the rod member 57 protruding from the hole 51a after the alarm fuse 41 is melted further penetrates the rod member through-hole 33b and protrudes to the outside.

  As shown in FIG. 4 (partially enlarged view of FIG. 1), the second wall portion 33 is spaced around the rod member through hole 33b provided in the second wall portion 33 with a predetermined interval in the circumferential direction. Six slits 33c penetrating through are formed. The six slits 33c are formed so that the wall portion 33d can be removed by pressing the wall portion 33d between the rod member through-hole 33b and the six slits 33c with a force of a predetermined level or more. The wall portion 33d plays a role of preventing a worker or the like from touching the alarm fuse 41 with a finger. The through-hole formed by removing the wall portion 33 d has a shape that can be used as a mounting hole for a limit switch or the like that includes an operated portion that is operated by the rod member 57. FIG. 5 is a perspective view of the alarming fuse device 1 to which the limit switch SW is attached. When the alarm fuse 41 is melted as a result of the load protection fuse 39 being melted in this state, the rod member 57 protrudes from the alarm fuse 41, and the rod member 57 turns on the limit switch SW. As a result, an alarm signal is transmitted informing that the load protection fuse 39 is blown.

  As shown in FIG. 2, the housing 5 and the fuse holding cartridge 7 are structured so that the alarm fuse 41 is surrounded by the housing 5 and the fuse holding cartridge 7 when the alarm fuse 41 is not in a blown state. It will be stored in the body unit 3.

  As in this example, when the alarm fuse 41 is in a blown state, the tip of the rod member 57 is configured to protrude through the rod member through hole 33b provided in the fuse holding cartridge 7, so that the fuse holding cartridge 7 The fuse device with an alarm function 1 in which the fuses 39 and 41 can be easily replaced can be easily manufactured with a simple configuration without using a complicated electric circuit device as in the prior art.

  According to the present invention, when the alarm fuse is in a blown state, the tip of the rod member is configured to protrude through the rod member through-hole provided in the housing or the fuse holding cartridge. There is no need to use an electrical circuit device. Therefore, a fuse device with an alarm function using a fuse holding cartridge can be easily manufactured with a simple configuration.

DESCRIPTION OF SYMBOLS 1 Fuse apparatus with alarm function 3 Structure unit 5 Housing 7 Fuse holding cartridge 29 A pair of terminal metal fittings 31 1st wall part 31a, 31b, 31c Inspection through-hole 33 2nd wall part 33a Lead wire insertion hole 33b Rod member Through hole 33c Slit 33d Wall portion 35 Third wall portion 35a Lead wire insertion hole 37 Knob 39 Load protection fuse 41 Alarm fuse 43 Fuse holding structure portion 57 Rod member SW Limit switch

Claims (7)

A housing;
A structure unit is configured in combination with the housing, and includes a load protection fuse and a fuse holding cartridge that removably holds an alarm fuse connected in parallel to the load protection fuse,
The alarm fuse has a structure in which a rod member protrudes from an alarm fuse body when the alarm fuse is melted as a result of the load protection fuse being melted.
When the housing and the fuse holding cartridge are combined to form the structure unit, and the alarm fuse is not in a blown state, the alarm fuse is enclosed by the structure unit so as to surround the entire alarm fuse. Stored inside,
The housing and the fuse holding cartridge are configured such that when the alarm fuse is in a blown state, a tip end portion of the rod member protrudes through a rod member through hole provided in the housing or the fuse holding cartridge. Fuse device with alarm function, characterized in that The fuse holding cartridge includes a first wall portion and a second wall portion and a third wall portion extending from both end portions of the first wall portion in a direction orthogonal to the first wall portion, A fuse holding structure for holding the load protection fuse and the alarm fuse is formed in a space surrounded by the first to third walls, and the rod is provided on the second wall or the third wall. It has a structure in which member through holes are formed,
2. The alarm function according to claim 1, wherein the housing has a structure for accommodating the fuse holding structure portion in a state where the first wall portion to the third wall portion are exposed. 3. With fuse device. The alarm fuse is disposed between the load protection fuse and the first wall of the fuse retaining cartridge;
The longitudinal dimension of the alarm fuse is longer than the longitudinal dimension of the load protection fuse,
The fuse holding structure is configured to hold the load protection fuse and the alarm fuse so that both ends of the alarm fuse exceed both ends of the load protection fuse,
A knob is provided at a central position in the longitudinal direction of the first wall,
A pair of inspection through holes is further formed in the first wall portion,
The pair of inspection through holes are provided on both sides of the knob in the longitudinal direction,
The positions of the pair of inspection through-holes can be visually confirmed through the pair of inspection through-holes when the alarm fuse is present, but when there is no alarm fuse, the pair of inspection through-holes can be visually confirmed. The fuse device with an alarm function according to claim 2, wherein a part of the load protection fuse cannot be visually confirmed through the through-hole for use. The second and third wall portions are formed with lead wire insertion holes into which a pair of lead wires provided with terminal fittings are inserted,
The housing holds a pair of terminal fittings electrically connected to a pair of terminals provided at both ends of the load protection fuse,
The screw hole into which a screw is inserted by the driver inserted through the pair of inspection through holes when the alarm fuse is not provided is formed in the pair of terminal fittings. Fuse device with alarm function.   The fuse device with an alarm function according to claim 4, wherein the knob is further provided with an inspection through hole extending through the first wall portion. The rod member through-hole provided in the second wall portion or the third wall portion penetrates the second wall portion or the third wall portion with a predetermined interval in the circumferential direction. A plurality of slits are formed,
3. The alarm function according to claim 2, wherein the plurality of slits are formed so that the wall portions can be removed when a wall portion between the rod member through-holes and the plurality of slits is pressed with a predetermined force or more. With fuse device.   The attachment through-hole formed by removing the wall portion has a shape that can be used as an attachment hole of a limit switch having an operation portion operated by the rod member therein. The fuse device with the alarm function described.

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