JP4223354B2 - Thermo protector - Google Patents

Description

The present invention relates to thermo-protector to operating temperature melting or softening point of the fusible material.

Elastic stress is used as a thermo protector that detects abnormal heat generation in electronic and electrical equipment, cuts off the equipment from the power supply by cut-off operation based on this detection, prevents the equipment from overheating, and prevents the occurrence of fire. There are stress types and thermal stress types such as bimetal switches.
As the stress type, for example, as shown in FIG. 6 (a), the elastic metal piece 2 ′ is forcibly bent, and both ends of the bent elastic metal piece 1 ′ are resisted against bending reaction force and a pair of fixed terminals 41 ′. , 42 ′ with a melting alloy (solder) 3 ′ having a predetermined melting point, the ambient temperature is raised to the melting point of the melting alloy 2 ′, and the melting alloy is melted, as shown in FIG. As shown in the figure, the bending stress of the elastic metal piece 2 ′ is released to disconnect the connection between one end of the elastic metal piece 2 ′ and one fixed terminal 42 ′ to cut off the energization (Patent Document 1). reference).
Further , as shown in FIG. 7 (a), a pellet 2 ′ having a predetermined melting point, a seat plate 15 ′, a compression spring 1 ′, and a seat plate 16 from one end side in a metal case 14 ′ having a lead terminal 13 ′ attached to one end. 'Is sequentially accommodated, and the contact 42' whose outer periphery is slidably contacted with the inner surface of the metal case is accommodated, and the lead pin through bushing 17 'is fixed to the other end side of the metal case 14'. A trip spring 18 'is assembled between the lead terminal 13', the metal case 14 ', the contact 42', and the lead pin 41 ', and the ambient temperature is raised to the melting point of the pellet 2'. When the pellet 2 'is melted, the compressive stress of the compression spring 1' is released as shown in FIG. 7B, and the contact 42 'from the tip of the lead pin 41' by the compressive stress of the tripping spring 18 '. Separated It is also known to cut off the conduction path, and it is called a so-called pellet type thermal fuse (see Non-Patent Document 1).
As described above, a bimetal switch is known as the thermal stress type.

JP 7-29481 A Page 818 of Electrical Engineering Handbook 1988

However, in the stress type shown in FIG. 6 , since the bending reaction force M ′ of the elastic metal piece and the n-direction expansion force F ′ act on the soluble alloy (solder), the stress distribution in the soluble alloy is complicated. Since the site of action is local, stress concentration is unavoidable and malfunction due to creep tends to occur. Furthermore, since the fusible alloy is a part of the current path, heat is generated due to an increase in resistance due to creep of the fusible alloy, and there is a concern about an operation error due to self-heating. Also, malfunction due to stringing of the molten alloy can occur.
In the pellet type shown in FIG. 7 , the structure is complicated even if the pellet can be uniformly compressed for pressure equalization by the seat plate, and the disadvantages in terms of downsizing and cost cannot be avoided.
Further, the bimetal type is a return type, and there is a risk that the operating temperature rises with time due to hysteresis as the ON / OFF repetition progresses.

  The purpose of the present invention is to guarantee the long-term stability of a thermosensor that operates with the elastic strain energy released by melting of the fusible material, which is supported by bonding and fixing with a fusible material such as solder. In addition, the reliability of the operation of the thermo protector using such a thermo sensor is improved.

The thermo-protector according to claim 1 is configured to fix one end of the conductive elastic body to the electrode of the housing having one of the upper and lower electrodes on one side by surface contact and electrically conducting, A longitudinal elastic load is applied to the conductive elastic body to cause elastic bending deformation, and the other end is fixed to the one electrode by surface bonding with a soluble material, and a housing containing the other electrode with respect to the one electrode is attached to the casing. The bending top of the conductive elastic body that has been bound and deformed is brought into contact with the other electrode, and is operated by releasing the elastic strain energy of the bending deformable conductive elastic body by melting or softening of the soluble material. Features.

The thermo-protector according to claim 2 is a method in which a portion spaced a predetermined distance from the tip of the elastic metal lead conductor is fixed to one surface of the housing by surface contact, and the lead conductor is elastically bent by applying a longitudinal load to the tip. At the same time, the front end portion is fixed to the one surface of the housing by surface bonding with a soluble material, and the housing accommodating the front end portion of the other lead conductor with respect to the one lead conductor is bound to the housing and is bent and deformed. The bending top portion of the conductive elastic body is brought into contact with the tip end portion of the other lead conductor, and the operation is performed by releasing the elastic strain energy of the bending deformation conductive elastic body by melting or softening of the soluble material.

The thermo protector according to claim 3 is the thermo protector according to claim 2, wherein at least one of the end of the elastic body or the surface of the housing to be surface-bonded is provided with a hole, a depression, and a notch, and the fusible material is engulfed. Features.

According to a fourth aspect of the present invention, there is provided the thermo protector according to the second aspect, wherein at least one of the end portion of the elastic body or the surface of the casing to be surface-bonded is a rough surface.

A thermosensor according to a fifth aspect is the thermoprotector according to any one of the first to fourth aspects , wherein the soluble material is a low melting point metal.

The thermosensor according to claim 6 is the thermoprotector according to any one of claims 1 to 4, wherein the soluble material is a thermoplastic resin.

  The other end of the elastic body and the housing surface are joined by a soluble material on the surface, and the elastic strain energy applied to the elastic body is supported by this joint surface so that only the shearing force acts mainly on the joint surface. Therefore, the stress distribution of the soluble material at the joint interface can be made uniform. Therefore, creep due to stress concentration in the fusible material can be well prevented, and malfunctions due to the fusible material creep can be eliminated to ensure long-term stability.

FIG. 1 shows the basic structure of a thermosensor used in the present invention .
In FIG. 1, 1 is a housing. Reference numeral 2 denotes a plate-like, foil-like or linear elastic body, one end of which is fixed in parallel contact with the housing surface, and the other end of the elastic body is in contact with the other end 22 of the elastic body in parallel with the housing surface. A longitudinal load f is applied to the portion 22 to add elastic bending strain energy, and the elastic body other end portion 22 is surface-bonded to the housing surface with the soluble material 3 while the elastic bending strain energy is applied.
In this thermosensor, when the external temperature is raised and the soluble material 3 is melted or softened, the bonding interface 32 is broken, the elastic bending strain energy is released, and the elastic body is restored to the original linear shape.

In FIG. 1, when the other end of the elastic body 2 is not fixed, buckling occurs if the longitudinal load f exceeds 4π ² EI / L ² (L is the length of the elastic body) according to Euler's theory. That is, above this Euler load, the work fΔλ (Δλ is the movement distance of the other end of the elastic body) made by the longitudinal load f exceeds the bending strain energy of the elastic body 2 and the system becomes unstable and buckling occurs.
Approximate the bending shape y of an elastic body in a stable system without buckling

  y = h (1-cos2πx / L) / 2

Then, the above pressing amount Δλ, that is,

Is given by Δλ = π ² h ² / (4L),

h = 2 (Δλ · L) ^1/2 / π

Therefore, the predetermined bending height h can be set by adjusting the pressing amount Δλ.

In FIG. 1, when the fusible material 3 reaches the melting point or softening point, the bending height h of the elastic body 2 becomes zero, and the other end of the elastic body moves outward by Δλ to return to the original linear state.
In the above, the main force acting on the joining interface 32 between the elastic body other end 22 and the housing surface is the shearing force f. If the area of the joining interface is S, the shear stress τ of the joining interface with respect to the shearing force f. Is

  τ = f / S

Given in.
Regarding the bending reaction force acting on the joint interface between the other end of the elastic body and the housing surface, the other end 22 of the elastic body is fixed at a deflection angle of almost zero, so that the bending reaction force can be kept small. Since the stress of the joint surface with respect to the bending reaction force can be dispersed in the joint area S, it can be kept small.

  For the shear stress τ = f / S at the joint interface, the shear strength at the joint interface needs to exceed f / S. This shear strength must have a sufficient safety factor. For this reason, a hole, a recess, or a notch is provided in one or both of the other end of the elastic body to be surface-bonded or the housing surface so that the soluble material can be used. It is desirable to enhance the shear strength of the joining interface by using one or both of the other end of the elastic body or the surface of the elastic body to be bitten or surface bonded. Moreover, in order to reinforce the interface surface-bonded with the said soluble material mechanically, a soluble material can also be piled up over the front end surface and housing surface of an elastic body.

For the casing 1, an insulator or metal body having a strength capable of withstanding the shearing force f or a composite of both is used. In the case of a thermo protector described later, a protector base housing can be used.
As the elastic body 2, a metal, a synthetic resin, or a composite of a metal and a synthetic resin can be used. The composite includes a resin mixed with metal powder. As described above, when an elastic body having a high electrical resistance value such as a metal powder mixed resin is used, the sensor or the protector can be operated by melting the fusible material by energization heat generation of the resistor.
As the fusible material 3, a fusible alloy such as solder, a single metal or a thermoplastic resin, or a conductive thermoplastic resin to which conductive powder is added can be used.

To manufacture the thermo sensor, one end of the elastic body is fixed in parallel contact with the housing surface, and then the longitudinal load f is applied in a state where the other end of the elastic body is in parallel contact with the housing surface. Then, a fusible material is interposed between the other end of the elastic body and the housing surface, and the contact interface is joined by heating and melting / solidifying the fusible material, thereby completing the production.
In this case, the melting point or softening point of the soluble material is maintained so that the bending strain of the elastic body is maintained even when the soluble material is melted / solidified, that is, the elastic body is not annealed. Is sufficiently higher than the melting point or softening point of the elastic body.
Thus, during operation of the thermosensor, the elastic strain energy of the elastic body can be maintained even when the soluble material is heated to its melting point or near the softening point, and the soluble material is heated to its melting point or softening point. When it is done, it can operate reliably.

  The fixing of the elastic body one end 21 and the housing surface also requires heat resistance that is stably maintained against any heating during manufacture and operation of the thermosensor. In the case of a synthetic resin (having a softening point higher than the softening point of the fusible material), riveting using a projection provided in advance as a stator, an adhesive having a melting point or softening point higher than the melting point or softening point of the fusible material When the casing surface is metal, welding such as resistance welding or electromagnetic induction heating welding (welding using a flux is preferable) can be used.

  In the thermosensor shown in FIG. 1, only the other end portion of the elastic body is surface-bonded to the housing surface with a soluble material, but one end portion of the elastic body can also be surface-bonded to the housing surface with a soluble material.

2 (a) is a plan view of an embodiment of the thermoprotector according to the present invention, FIG. 2 (b) is a cross-sectional view of FIG. 2 (a), and FIG. FIG. 3 is a cross-sectional view taken along the line A in FIG.
In FIG. 2, reference numeral 1 denotes a base housing, which is composed of an insulator such as ceramics or synthetic resin. Reference numerals 41 and 42 denote flat lead conductors. A straight electrode portion 410 is provided at the tip of one lead conductor 41, and a gap is formed in the thickness direction with respect to the straight electrode portion 410 at the tip of the other lead conductor 42. The bending electrode part 420 arrange | positioned at intervals is provided. Reference numeral 2 denotes an elastic metal plate. One end 21 is fixed to one lead conductor 41 by surface contact by rivets 5 or welding, and the vertical load f is applied to the other end 22 of the elastic plate 2 in this state. Then, bending strain energy is applied to the elastic plate 2, and the elastic plate other end 22 is melted and solidified by a surface contact with the leading end portion of one lead conductor 41 of a soluble material 3 such as a soluble alloy or a thermoplastic resin (possible). (The melting temperature of the molten material is set sufficiently lower than the annealing temperature of the elastic plate) to assemble the thermosensor according to the present invention, and the bent outer surface of the elastic plate 2 is the bent electrode of the other lead conductor 42 It is in contact with the part 420.
Reference numeral 6 denotes a housing, which is composed of an insulator such as ceramics or synthetic resin, and is attached to the base casing by fusion, for example, high frequency welding (when the base 1 and the housing 6 are both synthetic resin), an adhesive, a fitting method, or the like. It is bound.

In this thermoprotector, the electrical conduction is always made by the path of one lead conductor → elastic plate → the contact surface between the elastic plate and the other lead conductor electrode portion → the other lead conductor. Since the soluble material 3 is not included in the conduction path, the conductivity of the soluble material is not involved in the conductivity.
The operation of the thermoprotector will be described. When the fusible material 3 is heated to its melting point or softening point due to an increase in external temperature, the elastic plate other end 22 and one lead conductor are caused by the bending strain energy of the elastic plate 2. As shown in FIG. 3, the elastic plate 2 is restored to the original flat plate shape and the bending height of the elastic plate is reduced to 0, as shown in FIG. The contact between the plate 2 and the other lead conductor electrode portion 420 is removed, and the non-returning energization is turned off. In this case, since it is a requirement for starting the operation that the soluble material melts or softens and the elastic strain energy of the elastic body is released, even if stringing of the soluble material occurs, the operation performance may be affected. Absent.
A contact pressure acts on the contact surface between the bent outer surface of the elastic plate 2 and the other lead conductor electrode portion 420 in FIG. 2B, as will be described later, and helps to reduce the contact resistance. In order to achieve this, the contact surfaces can be joined with solder having a melting point lower than that of the soluble material described above. In this case, it is preferable to make the low melting point solder layer sufficiently thin in order to suppress stringing.

To manufacture the thermo protector shown in FIG. 2, the electrode portion 410 of one lead conductor 41 is arranged on the base housing 1 and the elastic plate 2 is arranged on the electrode portion 410 as shown in FIG. Then, one end portion 21 of the elastic body 2 is fixed to the base casing 1 together with the electrode portion 410 by a rivet 5 or the like, and then the longitudinal load f is applied to the elastic plate other end portion 22 as shown in FIG. 4 to give bending elastic energy to the elastic plate 2, and in this state, as shown in FIG. 4C, the contact interface between the elastic plate other end portion 22 and one lead conductor electrode portion tip side 411 is made of a soluble alloy. Then, the other lead conductor 42 is arranged as shown in FIG. 4 (d), and the bent electrode portion 420 of the lead conductor 42 is made of an elastic plate. 2 is brought into contact with the top of the bend, and then as shown in FIG. It was bound to the base skeleton 1 a housing 6 fusion, by an adhesive or fitting manner as to end the production at this.
At the time of manufacturing, the bending electrode portion 420 of the other lead conductor 42 is pressed by the housing 6 and a reaction force f ′ is generated on the contact surface with the bending top surface of the elastic body 2. Since the EI is small, the reaction force f ′ can be made sufficiently small, and the bending moment f′L ′ acting on the joint surface by the soluble material 3 based on the reaction force f ′ in FIG. . Therefore, it is possible to maintain a simple uniform distribution of shear stress on the joint surface by the fusible material between the other end portion of the elastic plate and the one end side of one lead conductor electrode portion.

In the thermo protector described with reference to FIGS. 2 to 4, only the other end portion of the elastic body is surface-bonded to the housing surface with a soluble material, but one end portion of the elastic body may be surface-bonded to the housing surface with a soluble material. it can.
In FIG. 2, the electrode part 420 of the other lead conductor 42 is not limited to the one shown in the figure as long as it is arranged at a certain distance from the electrode part 410 of the one lead conductor 41. It is also possible to position the bent portions 42 on the outside of the housing 6.
In the thermo protector shown in FIG. 2, a resistor such as carbon is interposed between the one end portion 21 of the elastic body and the lead conductor 41, and the soluble material 3 is melted and operated when the resistor is abnormally heated. Is also possible. That is, it can be operated by either external heating or predetermined energization heat generation of the resistor.

FIG. 5 (a) is a plan view of another embodiment of the thermoprotector according to the present invention, FIG. 5 (b) is a cross-sectional view of FIG. 5 (b), and one lead conductor is shown. The lead wire tip is used as an elastic body of the thermosensor. FIG. 5 (c) is a view showing the operation after the operation of the embodiment.
In FIG. 5, reference numeral 1 denotes a base housing, which is composed of an insulator such as ceramics or synthetic resin. Reference numeral 41 denotes one lead conductor, the tip of which is made of a plate-like elastic metal, and a portion spaced from the tip by a predetermined distance is fixed to the housing surface by surface contact with a rivet, welding, or the like 5, and in this state the lead A longitudinal load f is applied to the leading end of the conductor 41 to give bending strain energy to the leading end 2 of the elastic lead conductor, and the elastic lead conductor leading end 411 is contacted to the housing surface by a surface such as a soluble alloy or a thermoplastic resin. The thermosensor according to the present invention is formed by melting and solidifying the fusible material 3 (the melting temperature of the fusible material is sufficiently lower than the annealing temperature of the elastic lead conductor).
For welding and fixing 5 with the elastic lead conductor 41 in surface contact with the surface of the housing and for joining and fixing with the fusible alloy 3 under surface contact, the housing is obtained by pasting / etching metal foil or printing / baking metal powder paste. This can be done after metallizing the surface.
The other flat lead conductor 42 is formed by bending the tip portion 421 and contacting the bending top surface of the tip portion 2 of one elastic lead conductor.
Reference numeral 6 denotes a housing, which is made of an insulator such as ceramics or synthetic resin, and is bonded to the base casing by fusion, for example, high frequency welding (when the base and the housing are both synthetic resin), an adhesive, or a fitting method. It is.
As the one lead conductor, an elastic round wire whose tip is thinly crushed can be used.

In this thermo-protector, the lead conductor 41 is normally conducted through the path of the one lead conductor 41 → the one lead conductor tip 2 and the contact surface between the tip bent portion 420 of the other lead conductor 42 → the other lead conductor 42. Since the soluble material 3 is not included in the conduction path, the conductive property of the soluble material is not involved.
The operation of this thermo protector will be described. When the soluble material 3 is heated to its melting point or softening point due to an increase in external temperature, the leading edge of one lead conductor is caused by the bending strain energy of one elastic lead conductor tip 2. The surface joining by the fusible material 3 between the part 411 and the housing surface is released, and the elastic lead conductor tip 2 is returned to the original flat plate shape as shown in FIG. The height is reduced to 0, the contact surface between the one elastic lead conductor tip 2 and the tip bent portion 420 of the other lead conductor 42 is detached, and the non-returning energization-off is completed.

  Also in the above, the contact pressure acts on the contact surface between the bent outer surface of the tip portion 2 of the elastic lead conductor 2 and the tip bent portion 420 of the other lead conductor 42, which helps to reduce the contact resistance, but further reduces the contact resistance. For the purpose of illustration, the contact surface can be joined with a solder having a melting point lower than that of the aforementioned soluble material.

  For example, phosphor bronze can be used as the elastic metal material. When using resin as an elastic material, heat using FRP reinforced resin (thermoplastic resin or thermosetting resin) with fiber such as glass fiber, metal fiber, synthetic fiber, high-rigidity engineering plastic, etc. as soluble material The selection can be made in consideration of the relative relationship with the melting point of the plastic resin. As the elastic material, a composite of an elastic metal material and a synthetic resin, for example, a laminate of a phosphor bronze plate and a polyamide film can be used.

  Examples of the resin as the elastic material and the thermoplastic resin as the soluble material include polyethylene terephthalate, polyethylene naphthalate, polyamide, polyimide, polybutylene terephthalate, polyphenylene oxide, polyethylene sulfide, and polysulfone. Engineering plastics such as plastic, polyacetal, polycarbonate, polyphenylene sulfide, polyoxybenzoyl, polyether ether ketone, polyetherimide, polypropylene, polyvinyl chloride, polyvinyl acetate, polymethyl methacrylate, Polyvinylidene chloride, polytetrafluoroethylene, ethylene polytetrafluoroethylene copolymer, ethylene vinyl acetate copolymer (EVA), AS resin, ABS resin, ionomer, A S resin, can be selected ones of a predetermined melting point from in ACS resin.

  As the soluble alloy, it is preferable to use an alloy that does not contain elements harmful to biological systems such as Pb and Cd. The following composition [A] (1) 43% Sn ≦ 70%, 0 .5% ≦ In ≦ 10%, remaining Bi, (2) 25% ≦ Sn ≦ 40%, 50% ≦ In ≦ 55%, remaining Bi, (3) 25% Sn ≦ 44%, 55% In ≦ 74% 1% ≦ Bi 20%, (4) 46% Sn ≦ 70%, 18% ≦ In 48%, 1% ≦ Bi ≦ 12%, (5) 5% ≦ Sn ≦ 28%, 15% ≦ In 37%, remaining Bi (However, Bi ± 2%, In and Sn ± 1% are excluded based on Bi57.5%, In25.2%, Sn17.3% and Bi54%, In29.7%, and Sn16.3%, respectively. ), (6) 10% ≦ Sn ≦ 18%, 37% ≦ In ≦ 43%, remaining Bi, (7) 25% Sn ≦ 60%, 2 % ≦ In 50%, 12% Bi ≦ 33%, (8) 1 of Ag, Au, Cu, Ni, Pd, Pt, Sb, Ga, Ge, P in any one of (8) (1) to (7) 0.01 to 7 parts by weight in total of seeds or two or more kinds, (9) 33% ≦ Sn ≦ 43%, 0.5% ≦ In ≦ 10%, remaining Bi, (10) 47% ≦ Sn ≦ 49% 3 to 5 parts by weight of Bi are added to 100 parts by weight of 51% ≦ In ≦ 53%, (11) 40% ≦ Sn ≦ 46%, 7% ≦ Bi ≦ 12%, remaining In, (12) 0. 3% ≦ Sn ≦ 1.5%, 51% ≦ In ≦ 54%, remaining Bi, (13) 2.5% ≦ Sn ≦ 10%, 25% ≦ Bi ≦ 35%, remaining In, (14) (9 ) To (13) 100 parts by weight of Ag, Au, Cu, Ni, Pd, Pt, Sb, Ga, Ge, P or a total of 0.01 to 7 weights Addition, (15) 10% ≦ Sn ≦ 25%, 48% ≦ In ≦ 60%, remaining Bi is 100 parts by weight of Ag, Au, Cu, Ni, Pd, Pt, Sb, Ga, Ge, P Alternatively, the composition of the In—Sn—Bi alloy, such as the addition of two or more of 0.01 to 7 parts by weight in total [B] (16) 30% ≦ Sn ≦ 70%, 0.3% ≦ Sb ≦ 20%, Add one or more of Ag, Au, Cu, Ni, Pd, Pt, Ga, Ge, P to 100 parts by weight of the remaining Bi, (17), (16), and add 0.01 to 7 parts by weight in total, etc. The composition [C] (18) 52% ≦ In ≦ 85% of the Bi—Sn—Sb based alloy of the following: Sn, (19) In 100 parts by weight of (18), Ag, Au, Cu, Ni, Pd, Pt, Composition [D] (20) 4 of In-Sn alloy such that one or more of Sb, Ga, Ge, and P are added in a total of 0.01 to 7 parts by weight. 1% or more of Ag, Au, Cu, Ni, Pd, Pt, Sb, Ga, Ge, P in 100 parts by weight of the composition of 5% ≦ Bi ≦ 55%, remaining In, (21) (20) In-Bi based alloy composition such as addition of 0.01 to 7 parts by weight in total, [E] (22) 50% Bi ≦ 56%, remaining Sn, (23) Ag in 100 parts by weight of (22), Bi-Sn based alloy composition [F] (24) In, such as addition of one or more of Au, Cu, Ni, Pd, Pt, Ga, Ge, P in a total of 0.01 to 7 parts by weight One to two parts or more of Au, Bi, Cu, Ni, Pd, Pt, Ga, Ge, and P are added in a total of 0.01 to 7 parts by weight to 100 parts by weight, (25) 90% ≦ In ≦ 99.9 %, 0.1% ≦ Ag ≦ 10% in 100 parts by weight of Au, Bi, Cu, Ni, Pd, Pt, Ga, Ge, P or 2 0.01-7 parts by weight in total of seeds or more, (26) Au, Bi, Cu, Ni, Pd, 100 parts by weight of 95% ≦ In ≦ 99.9%, 0.1% ≦ Sb ≦ 5%, The composition of the melting point suitable for the operating temperature of the thermosensor or thermoprotector is selected from the composition of the In-based alloy such as addition of 0.01 to 7 parts by weight of one or more of Pt, Ga, Ge and P. be able to.

For the lead conductor, a conductive metal or alloy such as nickel, copper, or copper alloy can be used, and can be plated as necessary.
As described above, a contact material or an electrode can be provided at the tip of the lead conductor, and the tip of the elastic metal lead conductor can be crushed into an elastic plate shape.
In these cases, the shape of the lead conductor outside the housing and the housing can be any shape.

  High energy density secondary batteries, such as lithium ion secondary batteries and lithium polymer secondary batteries, have a high heat generation temperature due to the high energy density, and the heat is detected so that the battery is de-energized. Although a protector is required, the thermo protector according to the present invention can be easily reduced in size and can be favorably incorporated into a battery pack, and can be suitably used as a thermo protector for a battery.

It is drawing which shows the thermosensor used in this invention. It is drawing which shows one Example of the thermo protector which concerns on this invention. It is drawing which shows the operation state of the thermo protector shown in FIG. It is drawing which shows the manufacture process of the thermo protector shown in FIG. It is drawing which shows the Example different from the above of the thermoprotector which concerns on this invention. It is drawing which shows the conventional thermo protector. It is drawing which shows an example different from the above of the conventional thermoprotector.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Housing 2 Elastic body 21 One end part 22 of an elastic body The other end part 3 of an elastic body Soluble material 32 Joining surface 41 Lead conductor 42 Lead conductor 410 Electrode 420 Electrode 4100 Fixed contact material 4200 Movable contact material 5 Fixed location of one end of elastic body 6 Housing

Claims (6)

One end of the conductive elastic body is fixed to the electrode of the housing having one electrode of a pair of upper and lower electrodes on one side by surface contact and electrical conduction, and a longitudinal load is applied to the conductive elastic body. The other end portion is fixed to the one electrode by surface bonding with a soluble material, and the housing containing the other electrode with respect to the one electrode is bound to the housing and is bent and deformed. A thermo protector characterized in that a bending top portion of a conductive elastic body is brought into contact with the other electrode and is operated by releasing elastic strain energy of the bending deformation conductive elastic body by melting or softening of the soluble material . A portion at a predetermined distance from the tip of the elastic metal lead conductor is fixed to one surface of the housing by surface contact, and the lead conductor is elastically bent and deformed by applying a longitudinal load to the tip. A housing fixed to one surface by a fusible material and containing the tip of the other lead conductor with respect to the one lead conductor is connected to the housing, and the bending top of the conductive elastic body that has been bent and deformed is connected to the other. A thermo protector which is brought into contact with a lead conductor tip and is operated by releasing elastic strain energy of a bending deformation conductive elastic body by melting or softening of the soluble material.
3. The thermo protector according to claim 2 , wherein a fusible material is encroached by providing a hole, a dent, or a notch in at least one of a front end portion or a casing surface of the elastic metal lead conductor to be surface bonded. 3. The thermo protector according to claim 2, wherein at least one of a tip end portion or a casing surface of the elastic metal lead conductor to be surface-bonded is a rough surface. The thermoprotector according to claim 1, wherein the soluble material is a low melting point metal. The thermoprotector according to any one of claims 1 to 4, wherein the soluble material is a thermoplastic resin.

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