JP2012248426A5 - - Google Patents

Description

Non-energized breaker

  The present invention relates to a breaker that is built in an electric device such as a battery pack and cuts off a current when the temperature is higher than a preset temperature, and more particularly to a non-energized breaker that does not energize a bimetal.

  Devices such as battery packs and motors can improve safety by interrupting current when the temperature is abnormally high. For this purpose, a breaker is used that switches the contact off when the set temperature is reached. For example, a battery pack with a built-in lithium ion battery has a high temperature when charged and discharged in an abnormal use state. Therefore, a built-in breaker can be used safely by cutting off the current at an abnormally high temperature. Further, since the temperature of the motor or the like may become abnormally high in an overloaded state or an abnormal current flow, in this state, the current can be cut off by the breaker to protect the motor and be used safely.

As a breaker used for such an application, a breaker that cuts off a current in an abnormal state has been developed. (See Patent Document 1)
As shown in FIG. 1, this breaker is an energization type breaker having a bimetal 108 as a movable contact metal plate 106. Since this breaker uses the bimetal 108 as the movable contact metal plate 106, there is a drawback that the electric resistance of the movable contact metal plate 106 is increased by the bimetal. Further, in this energization type breaker, after the movable contact metal plate 106 of the bimetal 108 is deformed at the ambient temperature and the current is interrupted, when the ambient temperature is lowered and the bimetal 108 is restored, the movable contact 107 becomes the fixed contact 105 again. Touch to return to the on state. For example, when this breaker is used for a battery pack, the battery may rise to an abnormal temperature and cut off the current, and then when the temperature of the battery decreases, the battery can be turned on again and cannot be used safely. The state in which these devices are heated to an abnormal temperature and cut off the current when used in a battery pack or a motor is an abnormal state, so that it can be safely used by keeping the current cut off.

As a breaker that solves the disadvantages of this breaker, a non-energized breaker has been developed in which a bimetal and a movable contact metal plate are separated from each other and a heater for heating the bimetal is incorporated. (See Patent Document 2)
The non-energized breaker of Patent Document 2 is shown in FIG. In this breaker, a bimetal 208 is disposed between a fixed contact metal plate 204 provided with a fixed contact 205 and a movable contact metal plate 206 having a movable contact 207 in contact with the fixed contact 205. This non-energized breaker is deformed so that the bimetal 208 is reversed when the ambient temperature becomes high, and the movable contact 207 is separated from the fixed contact 205 to cut off the current. Further, this breaker incorporates a heater 209 that heats the bimetal 208 in the event of an abnormality. For example, the breaker can detect an abnormal state of the battery with a protection circuit or the like, energize the heater with a switching element of the protection circuit, and heat the bimetal to cut off the current. Further, since the bimetal reverses and cuts off the current even when the ambient temperature becomes high, the current can be cut off by detecting the ambient temperature without energizing the heater. Furthermore, the breaker incorporating the heater can also be held in a state where the current is cut off by energizing the heater and holding the bimetal in a heated state after the ambient temperature becomes high and cuts off the current. Therefore, the breaker of Patent Document 2 cuts off the current at the ambient temperature, cuts off the current by detecting an abnormal state such as a protection circuit, and further cuts off the current by turning on the heater in a state of cutting off the current. It can be kept in the state to do.

JP 2006-100054 A JP 2006-338927 A

  The non-energized breaker of Patent Document 2 reverses the bimetal at the ambient temperature, separates the movable contact from the fixed contact, and interrupts the current. The non-energized type breaker having this structure uses a bimetal as a metal plate different from the movable contact metal plate, reverses the bimetal and separates the movable contact from the fixed contact, and therefore a time delay is likely to occur in the bimetal inversion. This is because it takes time for the ambient temperature to be transmitted to the bimetal because the bimetal is inside the movable contact metal plate. The non-energized type breaker that cuts off the current at the temperature cuts off the current by detecting the abnormal temperature, so when the ambient temperature rises and becomes higher than the set temperature, the characteristic that cuts off the current as quickly as possible is required. Is done. This is because if the reversal of the bimetal is delayed while the ambient temperature is rapidly increased, the battery and the motor are damaged and the current cannot be safely interrupted. This adverse effect can be prevented by setting the inversion temperature of the bimetal low. However, the non-energized type breaker that cuts off the current at a low temperature has a problem that the current is cut off even if the battery or the motor is used for a long time without any trouble caused by heat. In addition, since the bimetal is inverted due to the difference in thermal expansion between the stacked metals, it is difficult to design the bimetal that is inverted at a low temperature. For this reason, it is important that the temperature at which the breaker operates to cut off the current of the battery or the motor is as high as possible at a temperature at which no problem occurs and is lower than the temperature at which the problem occurs. For this reason, the breaker is required to have a characteristic of quickly interrupting current at a lower temperature than damaging the equipment.

  The first object of the present invention is to achieve this, that is, a non-energized type that can reduce the on-resistance by using a movable contact metal plate and a bimetal as separate metal plates, and can quickly cut off the current in the event of an abnormality. To provide a breaker.

  Furthermore, as shown in FIG. 2, the non-energized breaker incorporating the heater for heating the bimetal with the bimetal and the movable contact metal plate as separate metal plates and further reducing the on-resistance is considerably thick as a whole. There are also drawbacks. Since the non-energized type breaker is built in a device such as a battery pack, it needs to be thin and can be stored in a small device.

  A second object of the present invention is to realize this, that is, to provide a non-energized breaker that can quickly cut off current at ambient temperature while making the whole thin.

Means for Solving the Problems and Effects of the Invention

  The non-energized breaker of the present invention has an outer case 1 formed of a plastic insulating case 2 and an outer metal plate 3, and a fixed contact 5 fixed to the insulating case 2 of the outer case 1. A fixed contact metal plate 4, a movable contact metal plate 6 fixed to the insulating case 2 and having a movable contact 7 at a position facing the fixed contact 5, and a bimetal 8 for switching the movable contact metal plate 6 from on to off. And a heater 9 for heating the bimetal 8. The exterior metal plate 3 and the fixed contact metal plate 4 are fixed to the insulating case 2 at positions facing each other, and between the fixed contact metal plate 4 and the exterior metal plate 3 in order from the fixed contact metal plate 4 side. Further, a heater 9, a bimetal 8, and a movable contact metal plate 6 are arranged. The bimetal 8 is curved in a central convex shape, and the heater 9 and the movable contact metal plate 6 are in a posture in which the central protrusion protrudes toward the movable contact metal plate 6 with the movable contact 7 in contact with the fixed contact 5. Between the two. The insulating case 2 is provided with a first outer wall 11A and a second outer wall 11B protruding at both end portions, and a storage space 20 is provided between the first outer wall 11A and the second outer wall 11B. In the storage space 20, the heater 9, the bimetal 8 and the movable part 6A of the movable contact metal plate 6 are accommodated, and the intermediate portion 4B of the fixed contact metal plate 4 is fixed to the first outer wall 11A. A part of the movable contact metal plate 6 is fixed to the outer wall 11B. Further, the exterior metal plate 3 is fixed to the first outer wall 11A and the second outer wall 11B, and the opening of the storage space 20 is closed without insert molding the insulating case 2. The storage space 20 of the insulating case 2 is closed with the exterior metal plate 3 exposed to the outer surface.

  The non-energized breaker described above is characterized in that the movable contact metal plate and the bimetal are used as separate metal plates to reduce the on-resistance, and further, the current can be cut off quickly in the event of an abnormality. This is because the above-mentioned non-energized type breaker has an exterior case composed of a plastic insulation case and an exterior metal plate, and the insulation case has a first outer wall and a second outer wall at both ends, and a storage space between them. The heater, the bimetal, and the movable part of the movable contact metal plate are arranged in the storage space, and both ends of the exterior metal plate are fixed to the first outer wall and the second outer wall without insert molding. This is because it has a unique structure for closing the storage space.

  Furthermore, the above-mentioned non-energized type breaker has a built-in bimetal which is a metal plate different from the movable contact metal plate, and despite the built-in heater which heats this bimetal, the whole is made thin and quickly. The feature that can cut off the current is also realized.

The non-energized breaker of the present invention can be fixed to the insulating case 2 by laminating one end of the exterior metal plate 3 in contact with the non-movable part 6B of the movable contact metal plate 6.
The above-mentioned non-energized type breaker fixes the outer metal plate directly on the movable contact metal plate and fixes it, so that the whole can be made thinner and the outer metal plate can also be used as a contact for the movable contact metal plate. .

Deenergization type breaker of the invention, the exterior metal plate 3 can be fixed by bonding to the outer wall 11.
Or unpowered type circuit breaker, since fixed by adhering the outer metal plate, while thinning the whole, has the characteristic that the outer metal plate can be reliably fixed to the insulating case.

The non-energized breaker of the present invention can be provided with an insulating film on the surface of the exterior metal plate 3.
Since the above-described non-energized type breaker is provided with the insulating film on the exterior metal plate, it can be incorporated in the built-in device in an insulated state, that is, in an insulated state where the exterior metal plate is in contact.

In the non-energized type breaker of the present invention, the insulating case 2 is formed by integrally forming a connecting rib 15 for connecting the outer metal plate 3 so as to protrude from the front end surface of the outer wall 11. The exterior metal plate 3 can be fixed to the insulating case 2 by having a through hole 25 that penetrates the connecting rib 15 provided in the insulating case 2 and inserting the connecting rib 15 into the through hole 25.
The above non-energized type breaker can securely fix the exterior metal plate to the insulating case.

In the non-energized breaker of the present invention, through holes 25 are provided at the four corners of the outer metal plate 3, and connecting ribs 15 inserted into the respective through holes 25 are provided at the distal end surface of the outer wall 11 of the insulating case 2. Can do.
The above-mentioned non-energized type breaker can more securely fix the outer metal plate to the insulating case while reducing the outer shape.

The non-energized type breaker of the present invention sandwiches and fixes the non-movable part 6B of the movable contact metal plate 6 between the distal end surface of the second outer wall 11B of the outer case 1 and the outer metal plate 3, The through holes 25 can be disposed on both outer sides of the fixed contact metal plate 4 and the movable contact metal plate 6.
The non-energized breaker described above can reliably fix the movable contact metal plate while securely fixing the outer metal plate.

In the non-energized type breaker of the present invention, the insulating case 2 has opposing walls 12 on both sides of the storage space 20 and connecting between the first outer wall 11A and the second outer wall 11B. And the outer wall 11 constitute the outer peripheral wall 10 of the storage space 20, and the exterior metal plate 3 has bent side walls 22 that are bent along the outer surface of the opposing wall 12 on both sides. The side wall 22 and the opposing wall 12 can be connected by a locking structure.
The above non-energized breaker can be thinned as a whole while the outer metal plate 3 is more securely fixed to the insulating case 2.

The non-energized breaker of the present invention has a locking projection 16 provided on the outer side of the opposing wall 12 and a locking projection provided on the bent side wall 22 with the locking structure of the bent side wall 22 and the opposing wall 12. It can be set as the locking hole 26 formed by guiding and locking the convex portion 16.
The above-mentioned non-energized type breaker can fix the exterior metal plate 3 to the insulating case 2 easily and easily and reliably.

It is sectional drawing which shows the conventional breaker. It is sectional drawing which shows the other conventional breaker. It is a perspective view of the non-energized type breaker concerning one Example of this invention. It is a vertical longitudinal cross-sectional view of the non-energized type breaker shown in FIG. It is sectional drawing which shows the OFF state of the non-energized type breaker shown in FIG. It is the VI-VI sectional view taken on the line of the non-energized type breaker shown in FIG. It is the VII-VII sectional view taken on the line of the non-energized type breaker shown in FIG. It is the VIII-VIII sectional view taken on the line of the non-energized type breaker shown in FIG. It is sectional drawing which shows another example of a connection rib, Comprising: It is a figure corresponded in the IX-IX line cross section of FIG. It is sectional drawing which shows another example of a connection rib, Comprising: It is a figure corresponded in the VI-VI line cross section of FIG.

  Embodiments of the present invention will be described below with reference to the drawings. However, the embodiment shown below exemplifies a non-energized type breaker for embodying the technical idea of the present invention, and the present invention does not specify the non-conductive type breaker as follows. Further, in this specification, in order to facilitate understanding of the scope of claims, numbers corresponding to the members shown in the examples are indicated in the “claims” and “means for solving problems” sections. It is added to the members. However, the members shown in the claims are not limited to the members in the embodiments.

  The following non-energized type breakers are mainly built in the battery pack, and when the battery or ambient temperature is high, or the battery pack is used in an abnormal state, the bimetal is deformed to cut off the current. used. In particular, the non-energized breaker of the present invention has a built-in heater for heating the bimetal, and is optimal for applications in which the bimetal is heated by this heater and the current is cut off. However, the non-energized type breaker of the present invention is not limited to a battery pack, and can be used for all applications such as a motor that detects a temperature rise and cuts off current.

  The non-energized type breaker shown in FIGS. 3 to 8 includes a bimetal 8 that fixes the fixed contact metal plate 4 and the movable contact metal plate 6 to the exterior case 1 and deforms the movable contact metal plate 6. A heater 9 for heating the bimetal 8 is incorporated.

  The outer case 1 is formed of a plastic insulating case 2 and an outer metal plate 3. The outer case 1 has the fixed contact metal plate 4 inserted and fixed to the bottom 13 of the insulating case 2 and fixed to the upper surface of the outer metal plate 3. The insulating case 2 is provided at both end portions so as to project the first outer wall 11A and the second outer wall 11B, and a storage space 20 is provided between the first outer wall 11A and the second outer wall 11B. Yes. The storage space 20 is closed at the bottom with the fixed contact metal plate 4 that is fixed by insert molding, and closed at the top with the exterior metal plate 3. Therefore, the exterior case 1 has the fixed contact metal plate 4 exposed on the bottom surface and the exterior metal plate 3 exposed on the top surface. The exterior metal plate 3 is not fixed by insert molding to the plastic insulating case 2, and almost the entire surface is exposed to the upper surface side.

  The insulating case 2 is provided with opposing walls 12 that connect the first outer wall 11 </ b> A and the second outer wall 11 </ b> B on both sides of the storage space 20, and the opposing wall 12 and the outer wall 11 surround the storage space 20. The surrounding outer peripheral wall 10 is constituted. Accordingly, the storage space 20 has a hollow shape in which the periphery is surrounded by the outer peripheral wall 10, the bottom surface is closed by the fixed contact metal plate 4, and the upper surface is closed by the exterior metal plate 3 to close the inside.

  The insulating case 2 is formed by insert-molding a part of the fixed contact metal plate 4 on the first outer wall 11A and the intermediate portion 4B of the fixed contact metal plate 4 in the middle of the first outer wall 11A in FIGS. It is fixed. Therefore, the fixed contact metal plate 4 is fixed to the insulating case 2 in a state of penetrating the first outer wall 11A, the portion exposed to the inside of the storage space 20 is set as the fixed contact 5, and the portion drawn out to the outside is the connection terminal 4X. It is said.

  The insulating case 2 fixes the non-movable part 6B of the movable contact metal plate 6 to the second outer wall 11B. The non-energized type breaker of FIGS. 4 and 5 has a non-movable portion 6B of the movable contact metal plate 6 fixed to the upper end surface of the second outer wall 11B. The movable contact metal plate 6 is bonded and fixed to the second outer wall 11B, or sandwiched between the exterior metal plates 3 and fixed to the upper end surface of the second outer wall 11B. In the illustrated exterior case 1, one end of the exterior metal plate 3 is laminated in contact with the non-movable portion 6 </ b> B of the movable contact metal plate 6 and fixed to the insulating case 2. In this structure, since the exterior metal plate 3 is directly laminated and fixed on the movable contact metal plate 6, the whole can be made thinner.

  Furthermore, the insulating case 2 shown in the sectional views of FIGS. 4 to 6 is provided with a storage recess 21 in which the heater 9 is disposed in the storage space 20. The storage recess 21 is in the center of the storage space 20, and the bottom surface thereof is closed by the tip end 4 </ b> A of the fixed contact metal plate 4. The storage recess 21 has an inner shape slightly larger than the outer shape of the heater 9 so that the heater 9 can be inserted therein. The storage recess 21 is provided with a protrusion 14 along the outer peripheral edge. The heater 9 inserted into the storage recess 21 slightly protrudes from the upper surface of the protruding portion 14 and places the bimetal 8 that is curved on the upper surface in a thermally coupled state.

  In the storage space 20, the bottom surface of the storage recess 21 is closed with the fixed contact metal plate 4, and the outer bottom surface of the storage recess 21 is closed with the plastic of the insulating case 2. The insulating case 2 is fixed to the insulating case 2 by insert-molding a fixed contact metal plate 4 on a plastic bottom 13 that closes the bottom of the storage space 20 outside the storage recess 21.

  The exterior metal plate 3 that closes the upper surface of the storage space 20 is fixed to the outer wall 11 of the insulating case 2 at both ends without insert molding. In the non-energized type breaker of FIGS. 3 to 5, both end portions of the exterior metal plate 3 are fixed to the upper end surfaces of the first outer wall 11A and the second outer wall 11B. The exterior metal plate 3 is fixed to the insulating case 2 via connecting ribs 15 that are integrally formed on the first outer wall 11A and the second outer wall 11B. 4 and FIG. 5, the connecting rib 15 for connecting the outer metal plate 3 is provided so as to protrude from the front end surface of the outer wall 11, as indicated by a chain line. The exterior metal plate 3 is provided with through holes 25 that allow the connection ribs 15 to pass therethrough. The connection ribs 15 are inserted into the through holes 25 to fix the exterior metal plate 3 to the insulating case 2. In a state where the connecting rib 15 is inserted into the through-hole 25, the distal end surface of the outer wall 11 of the insulating case 2 is reliably secured by pressing and crushing the distal end of the connecting rib 15 or by ultrasonic vibration. That is, it is fixed to the upper surface. With the above structure, the exterior metal plate 3 can be reliably and easily fixed to the accurate position of the insulating case 2. However, the exterior metal plate can be bonded and fixed to the upper surface, which is the front end surface of the insulating case. The exterior metal plate that is bonded and fixed to the insulating case is also provided with a through hole, a connecting rib that is inserted into the through hole is provided on the outer wall, and the connecting rib is inserted into the through hole so that the fixed position of the insulating case is maintained. Can be fixed securely.

  The exterior metal plate 3 is provided with through holes 25 at the four corners, and the connecting ribs 15 inserted into the respective through holes 25 are provided on the distal end surface of the outer wall 11 of the insulating case 2. FIG. 7 shows a cross-sectional view of the first outer wall 11A fixing the exterior metal plate 3, and FIG. 8 shows a cross-sectional view of the second outer wall 11B. The first outer wall 11 </ b> A shown in FIG. 7 protrudes from the upper end surface of the opposing wall 12 provided on both sides of the storage space 20 and is provided with connecting ribs 15. The connecting rib 15 is formed in the shape shown on the right side of the drawing, and in the state inserted into the through hole 25, as shown on the left side, the distal end is crushed to fix the exterior metal plate 3. The first outer wall 11A shown in FIG. 7 is provided with a connecting rib 15 on the upper surface of the opposing wall 12 provided on both sides of the storage space 20, but the first outer wall 11A is taken along line IX-IX in FIG. At the position shown, as shown in the cross-sectional view of FIG. 9, the exterior metal plate 3 can be fixed by providing a connecting rib 15 on the upper surface of the first outer wall 11A. Further, the outer case 1 is provided with a connecting rib 15 protruding from the upper surface of the opposing wall 12 at the position indicated by the line VI-VI in FIG. It is also possible to provide through holes 25 in the exterior metal plate 3 and fix the intermediate part of the exterior metal plate 3 to the insulating case 2.

  Further, the exterior metal plate 3 shown in the cross-sectional views of FIGS. 6 to 8 is provided with a bent side wall 22 that is bent along the outer surface of the facing wall 12 on both sides, and is opposed to the bent side wall 22. The wall 12 is connected by a locking structure. The exterior metal plate 3 shown in the figure is provided on the bent side wall 22 with a locking projection 16 provided on the bent side wall 22 and the opposing wall 12 so as to protrude outward from the opposing wall 12. It comprises a locking hole 26 that guides and locks the locking projection 16. The locking projection 16 is provided with an inclined surface 16A that gradually protrudes in the insertion direction so that the locking projection 16 can be smoothly guided to the locking hole 26.

  Further, in the locking structure of FIG. 9, a locking piece 27 that is bent inward is provided at the leading edge of the bent side wall 22, and the locking recess 17 that guides the locking piece 27 is provided opposite to the insulating case 2. Provided on the outer surface of the wall 12, the locking piece 27 is guided to the locking recess 17, and the exterior metal plate 3 is fixed to the insulating case 2 with a locking structure.

  Furthermore, the locking structure of FIG. 10 is provided with a locking piece 27 bent inward at the tip edge of the bent side wall 22, and this locking piece 27 is hooked on the bottom surface of the opposing wall 12 to provide an exterior metal plate. 3 is fixed to the insulating case 2 with a locking structure. These locking structures are formed by elastically deforming the bent side wall 22 and connecting it to the insulating case 2 with a locking structure. In the connected state, the locking convexity is generated by the elastic restoring force of the bent side wall 22. The part 16 and the locking piece 27 are held in a position to be hooked on the locking hole 26, the locking recess 17 or the bottom surface.

  Furthermore, the exterior metal plate 3 is provided with an insulating film (not shown) on the surface. This insulating film is provided on the surface of the exterior metal plate 3 by applying an insulating paint. However, the insulating layer can be provided by attaching an insulating sheet to the surface of the exterior metal plate. Thus, the non-energized type breaker in which the exterior metal plate 3 is provided with the insulating film can be insulated from the surface of the exterior metal plate 3 with the insulation film, and can be incorporated in the device in a contact state.

  In the storage space 20 of the insulating case 2, the heater 9, the bimetal 8, and the movable part 6 </ b> A of the movable contact metal plate 6 are stored in order from the bottom, and the fixed contact metal plate is placed on the first outer wall 11 </ b> A of the insulating case 2. 4 is fixed, and the non-movable portion 6B of the movable contact metal plate 6 is fixed to the second outer wall 11B.

  The fixed contact metal plate 4 is fixed to the insulating case 2 by insert molding. The fixed contact metal plate 4 is insert-molded so that the front end portion 4A is embedded in the bottom portion 13 of the storage space 20 and the intermediate portion 4B is embedded from the bottom portion 13 of the storage space 20 to the first outer wall 11A of the insulating case 2. It is fixed to the insulating case 2. The fixed contact metal plate 4 shown in FIGS. 4 and 5 is provided with a step 4D so that a portion embedded in the first outer wall 11A is higher than a portion closing the bottom of the storage recess 21. Is embedded in the bottom portion 13 of the insulating case 2, and the rear end side of the stepped portion 4 </ b> D is exposed on the upper surface of the bottom portion 13, and this exposed portion is used as the fixed contact 5.

  The heater 9 generates heat when energized and heats the bimetal 8. The heater 9 is a PTC heater having a thickness in which an opposing surface is an oval or a rectangle, and electrodes are provided on the upper surface and the lower surface. However, it is not always necessary to use a PTC heater as the heater, and all heaters that can be energized to heat the bimetal 8 can be used. The heater 9 provided with electrodes on the upper and lower surfaces makes the lower surface contact the fixed contact metal plate 4 and allows the upper surface to contact the movable contact metal plate 6 via the bimetal 8. In the heater 9, when the movable contact 7 of the movable contact metal plate 6 contacts the fixed contact 5, the movable contact metal plate 6 and the bimetal 8 are not in contact with each other and are not energized. In a state in which the movable contact 7 is away from the fixed contact 5 and is in the off state, the bimetal 8 is energized through the bimetal 8 that contacts the movable contact metal plate 6 and the fixed contact metal plate 4 to generate heat, thereby heating the bimetal 8. As shown in FIG. 5, the heated bimetal 8 holds the movable contact 7 in an off state in which the movable contact 7 is separated from the fixed contact 5. This non-energized type breaker holds the movable contact 7 in the OFF state in the state switched to the OFF state, so that it can be safely used for a battery pack. That is, the battery pack is used in an abnormal state and becomes higher than the set temperature, and after the non-energized breaker is switched off, the heater 9 is continuously energized from the battery pack battery and the bimetal 8 is heated. Therefore, the circuit breaker can be maintained in a state of interrupting the current until the battery is discharged without returning to the on state.

  The bimetal 8 is formed by laminating metals having different coefficients of thermal expansion so as to be deformed by heating. The bimetal 8 is disposed between the heater 9 and the movable contact metal plate 6 and is deformed so as to be reversed by being heated, so that the movable contact 7 is separated from the fixed contact 5 and the breaker is turned off. In the state where the bimetal 8 is curved in the center convex shape and is not thermally deformed, that is, in the state where the movable contact 7 is brought into contact with the fixed contact 5, as shown in FIG. In the state of projecting to the side and deforming so as to be reversed by thermal deformation, the center projecting portion projects to the heater 9 side as shown in FIG. As shown in FIG. 5, the bimetal 8 is brought into contact with the heater 9 at the center protruding portion and in contact with the movable contact metal plate 6 to press the movable portion 6A in a state where the bimetal 8 is reversed by thermal deformation. Push up to move the movable contact 7 away from the fixed contact 5 and switch it off.

  As shown in FIGS. 4 and 5, the movable contact metal plate 6 fixes the non-movable part 6 </ b> B, which is an intermediate part, to the upper end surface of the second outer wall 11 </ b> B, and moves the movable part 6 </ b> A on the distal end side of the storage space 20. Arranged inside, the rear end is drawn out of the outer case 1 to form the connection terminal 6X. The movable contact metal plate 6 is fixed to the upper end surface of the second outer wall 11B by bonding the non-movable part 6B. Further, as shown in FIGS. 4, 5, and 8, the movable contact metal plate 6 has a non-movable portion 6B sandwiched between the second outer wall 11B and the exterior metal plate 3, so that the second outer wall 11B It is fixed to the top surface. In the non-energized type breaker shown in the figure, one end portion of the exterior metal plate 3 is laminated in contact with the non-movable portion 6B of the movable contact metal plate 6. Therefore, the exterior metal plate 3 can also be used as a contact point of the movable contact metal plate 6. However, the movable contact metal plate can be laminated while being insulated from the exterior metal plate.

  The movable contact metal plate 6 is a metal plate that can elastically deform the movable portion 6A disposed in the storage space 20. Further, the movable contact metal plate 6 is provided with a movable contact 7 on the surface of the movable portion 6 </ b> A that faces the fixed contact 5. When the bimetal 8 is not thermally deformed, the movable contact metal plate 6 is turned on when the movable contact 7 comes into contact with the fixed contact 5, and when the bimetal 8 is thermally deformed, the movable portion 6A pushed by the bimetal 8 is Due to elastic deformation, the movable contact 7 is separated from the fixed contact 5 and is turned off. The non-energized type breaker shown in FIGS. 4 and 5 presses the rear end portion of the movable portion 6A downward so that the movable contact 7 can surely come into contact with the fixed contact 5 without the bimetal 8 being thermally deformed. The pressing convex portion 23 is provided so as to protrude from the inner surface of the exterior metal plate 3. In this movable contact metal plate 6, the rear end portion of the movable portion 6A is pressed downward by the pressing convex portion 23, whereby the distal end portion of the movable portion 6A is urged downward, and the movable contact 7 at the distal end is reliably secured. To the fixed contact 5.

  Further, the movable contact metal plate 6 shown in FIGS. 4 to 6 is provided with a protruding portion 6C on the lower surface, and both ends of the bimetal 8 are brought into contact with the protruding portion 6C to press each other. The projecting portion 6C shown in the drawing has an arc shape, so that both end portions of the bimetal 8 can be reliably brought into contact with each other without being slid in the lateral direction and pressed together. The movable contact metal plate 6 shown in the figure has a plurality of protrusions 6 </ b> C on the lower surface facing both ends of the bimetal 8. In this structure, even the wide bimetal 8 can be brought into contact with each other and pressed together.

DESCRIPTION OF SYMBOLS 1 ... Exterior case 2 ... Insulation case 3 ... Exterior metal plate 4 ... Fixed contact metal plate 4A ... Tip part
4B ... Intermediate part
4D ... Step part
4X: Connection terminal 5 ... Fixed contact 6 ... Movable contact metal plate 6A ... Movable part
6B ... Non-movable part
6C ... Projection
6X: connection terminal 7 ... movable contact 8 ... bimetal 9 ... heater 10 ... outer peripheral wall 11 ... outer wall 11A ... first outer wall
DESCRIPTION OF SYMBOLS 11B ... 2nd outer wall 12 ... Opposite wall 13 ... Bottom part 14 ... Protrusion part 15 ... Connection rib 16 ... Locking convex part 16A ... Inclined surface 17 ... Locking recessed part 20 ... Storage space 21 ... Storage recessed part 22 ... Bending side wall 23 ... Pressing convex portion 25 ... Through hole 26 ... Locking hole 27 ... Locking piece 105 ... Fixed contact 106 ... Moving contact metal plate 107 ... Moving contact 108 ... Bimetal 204 ... Fixed contact metal plate 205 ... Fixed contact 206 ... Moving contact metal Plate 207 ... Moving contact 208 ... Bimetal 209 ... Heater

Claims (6)

An outer case (1) formed of a plastic insulating case (2) and an outer metal plate (3), and a fixed contact (5) fixed to the insulating case (2) of the outer case (1) A fixed contact metal plate (4) having a movable contact metal plate (6) fixed to the insulating case (2) and having a movable contact (7) at a position facing the fixed contact (5). A bimetal (8) for switching the contact metal plate (6) from on to off, and a heater (9) for heating the bimetal (8),
The exterior metal plate (3) and the fixed contact metal plate (4) are positioned opposite to each other and fixed to the insulating case (2), and the fixed contact metal plate (4) and the exterior metal plate (3) Between, in order from the fixed contact metal plate (4) side, the heater (9), the bimetal (8), and the movable contact metal plate (6) are arranged,
The bimetal (8) has a shape that curves in a central convex shape, and in a state in which the central protrusion protrudes toward the movable contact metal plate (6) with the movable contact (7) in contact with the fixed contact (5). Arranged between the heater (9) and the movable contact metal plate (6),
The insulating case (2) is provided with a first outer wall (11A) and a second outer wall (11B) protruding from both end portions, and the first outer wall (11A) and the second outer wall (11B) A storage space (20) is provided in between, and in this storage space (20), the heater (9), the bimetal (8), and the movable part (6A) of the movable contact metal plate (6) are stored. The non-movable part (6B) of the fixed contact metal plate (4) is fixed to the first outer wall (11A), and the movable contact metal plate (6) is fixed to the second outer wall (11B). The part is fixed,
Furthermore, the exterior metal plate (3) is fixed to the first outer wall (11A) and the second outer wall (11B) at both ends thereof without being insert-molded into the insulating case (2). The opening portion of the storage space (20) is closed, and the exterior metal plate (3) is exposed to the outside surface, and the storage space (20) of the insulating case (2) is closed, and the non-energized type. breaker.   The one end of the exterior metal plate (3) is laminated on the non-movable part (6B) of the movable contact metal plate (6) in a contact state and fixed to the insulating case (2). Non-energized type breaker. The non-energized breaker according to claim 1 or 2, wherein the exterior metal plate (3) is bonded to the outer wall (11).   The non-energized breaker according to any one of claims 1 to 3, wherein an insulating film is provided on a surface of the exterior metal plate (3). The insulating case (2) has opposing walls (12) on both sides of the storage space (20) and connecting the first outer wall (11A) and the second outer wall (11B). (12) and the outer wall (11) constitute an outer peripheral wall (10) of the storage space (20), and the outer metal plate (3) is folded along the outer surface of the opposing wall (12). songs and have a bent side wall (22) on both sides formed by this folding side walls (22) opposed walls (12) and is described in any of 4 claims 1 formed by coupling with a locking structure Non-energized type breaker. The folding structure of the bent side wall (22) and the opposing wall (12) is provided on the bent side wall (22) and a locking projection (16) provided outside the opposing wall (12). The non-energized type breaker according to claim 5 , which is a locking hole (26) configured to guide and lock the locking projection (16).