CN116569296A - Thermally responsive switching element and circuit - Google Patents
Thermally responsive switching element and circuit Download PDFInfo
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- CN116569296A CN116569296A CN202180082284.1A CN202180082284A CN116569296A CN 116569296 A CN116569296 A CN 116569296A CN 202180082284 A CN202180082284 A CN 202180082284A CN 116569296 A CN116569296 A CN 116569296A
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- thermally responsive
- contact
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- fixed contact
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01H—ELECTRIC SWITCHES; RELAYS; SELECTORS; EMERGENCY PROTECTIVE DEVICES
- H01H37/00—Thermally-actuated switches
- H01H37/02—Details
- H01H37/32—Thermally-sensitive members
- H01H37/52—Thermally-sensitive members actuated due to deflection of bimetallic element
- H01H37/54—Thermally-sensitive members actuated due to deflection of bimetallic element wherein the bimetallic element is inherently snap acting
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- Physics & Mathematics (AREA)
- Thermal Sciences (AREA)
- Thermally Actuated Switches (AREA)
Abstract
A thermally responsive switching element (1) is provided with: a fixed contact (21); a movable piece (4) that presses the movable contact (41) against the fixed contact (21) to bring the movable contact into contact with the fixed contact; and a thermally responsive element (5) that elastically deforms the movable piece (41) to separate the movable contact (41) from the fixed contact (21), and deforms with a change in temperature to thereby actuate the movable piece (4) to bring the movable contact (41) into contact with the fixed contact (21). The thermally responsive element (5) comprises a first layer (51) having a first thermal expansion coefficient and a second layer (52) having a second thermal expansion coefficient higher than the first thermal expansion coefficient. In the thickness direction of the thermally responsive element (5), a first layer (51) is arranged on the fixed contact (21) side, and a second layer (52) is arranged on the movable contact (4) side.
Description
Technical Field
The present invention relates to a thermally responsive switching element and the like.
Background
Conventionally, as an example of a thermally responsive switching element, a circuit breaker that cuts off a current according to a temperature rise has been known (for example, refer to patent document 1).
Prior art literature
Patent literature
Patent document 1: WO2011/105175
Disclosure of Invention
(problem to be solved by the invention)
In the thermally responsive switch disclosed in patent document 1, since the movable contact is in contact with the fixed contact at normal times and the conductive state is maintained between the movable piece and the fixed piece, joule heat is generated in the movable piece and the fixed piece. Therefore, the temperature of the thermally responsive element may be a temperature obtained by adding the temperature raised by the joule heat to the ambient temperature of the thermally responsive switching element, and the ambient temperature of the thermally responsive switching element may not be accurately sensed.
The present invention has been made in view of the above-described circumstances, and a main object thereof is to provide a thermally responsive switching element that operates accurately in response to a temperature rise around the thermally responsive switching element without being affected by joule heat.
(means for solving the problems)
The first invention of the present invention includes: a fixed contact; a movable piece having a movable contact, the movable contact being pressed against and contacting the fixed contact; and a thermally responsive element that deforms the movable contact by elastically deforming the movable piece so that the movable contact is separated from the fixed contact and deforms with a change in temperature, the thermally responsive element including a first layer having a first thermal expansion coefficient and a second layer having a second thermal expansion coefficient higher than the first thermal expansion coefficient, the first layer being disposed on the fixed contact side and the second layer being disposed on the movable contact side in a thickness direction of the thermally responsive movable element.
The second invention of the present invention includes: a fixed contact; a movable piece having a movable contact, the movable contact being pressed against the fixed contact to be brought into contact therewith; and a thermally responsive element that deforms the movable contact by elastically deforming the movable piece so as to separate the movable contact from the fixed contact and deform the movable piece in response to a change in temperature, wherein the thermally responsive element includes a first layer having a first thermal expansion coefficient and a second layer having a second thermal expansion coefficient higher than the first thermal expansion coefficient, and the second layer is disposed on the movable piece side in a thickness direction of the thermally responsive movable element.
Preferably, the thermally responsive switch device according to the present invention includes a case having a space for accommodating the fixed contact, the movable piece, and the thermally responsive element, wherein the case has a bottom wall and a contact portion protruding from the bottom wall toward the thermally responsive element side and contacting the first layer.
In the thermally responsive switch element of the present invention, preferably, a through hole penetrating the case is formed in a region overlapping a part of the thermally responsive element in a plan view of the case as viewed from a thickness direction of the thermally responsive element.
A third invention of the present invention is a circuit including the thermally responsive switch element, a power supply, and a load, the thermally responsive switch element being connected in series with a power line connecting the power supply and the load.
A fourth invention of the present invention is a circuit including the thermally responsive switch element, a power source, and a load, the thermally responsive switch element being connected in parallel with the load through a power line connecting the power source and the load.
(effects of the invention)
In the thermally responsive switch element according to the first aspect of the present invention, the thermally responsive element elastically deforms the movable piece in a state where joule heat is not generated, thereby separating the movable contact from the fixed contact, and deforms with a change in temperature, thereby operating the movable piece so that the movable contact is in contact with the fixed contact. Thus, the thermally responsive switch element is not affected by joule heat generated by the fixed contact, the movable contact, and the movable piece, and is accurately operated in response to a temperature rise around the thermally responsive switch element. Further, the thermally responsive element includes the first layer having the first thermal expansion coefficient and the second layer having the second thermal expansion coefficient higher than the first thermal expansion coefficient, and the first layer is disposed on the fixed contact side and the second layer is disposed on the movable contact side in the thickness direction of the thermally responsive movable element. Therefore, the accurate operation can be obtained without increasing the thickness of the thermally responsive switch element.
In the thermally responsive switch element according to the first aspect of the present invention, the thermally responsive element elastically deforms the movable piece in a state where joule heat is not generated, thereby separating the movable contact from the fixed contact, and deforms with a change in temperature, thereby operating the movable piece so that the movable contact is in contact with the fixed contact. Thus, the thermally responsive switch element is not affected by joule heat, and is accurately operated in response to a temperature rise around the thermally responsive switch element. Further, the thermally responsive element protects the first layer having the first thermal expansion coefficient and the second layer having the second thermal expansion coefficient higher than the first thermal expansion coefficient, and the second layer is arranged on the movable piece side in the thickness direction of the thermally responsive movable element. Therefore, the accurate operation can be obtained without increasing the thickness of the thermally responsive switch element.
Drawings
Fig. 1 is a perspective view showing a state before assembly of a schematic configuration of a thermally responsive switch element according to an embodiment of the present invention.
Fig. 2 is a cross-sectional view showing the thermally responsive switch element described above when the contacts are in the on state.
Fig. 3 is a cross-sectional view showing the thermally responsive switch element in the closed state of the contacts.
Fig. 4 is a perspective view showing a structure of a modification of the case body of fig. 1.
Fig. 5 is a plan view showing a relationship between the thermally responsive member and the through-hole in the case body of fig. 4.
Fig. 6 is a circuit diagram showing a circuit including the thermally responsive switching element of fig. 1.
Fig. 7 is a circuit diagram showing a circuit different from the circuit of fig. 6.
Detailed Description
A thermally responsive switching element according to an embodiment of the present invention will be described with reference to the accompanying drawings. Fig. 1 to 3 show the structure of the thermally responsive switching element 1. The thermally responsive switch element 1 includes a fixed contact 21, a movable piece 4 having a movable contact 41, and a thermally responsive element 5 that deforms with a change in temperature. In the thermally responsive switch element 1 of the present embodiment, the fixed contact 21, the movable contact 41, the movable piece 4, and the thermally responsive element 5 are provided inside the case 10. The case 10 is constituted by a case main body (first case) 7, a cover member (second case) 8 attached to the case main body 7, and the like.
The fixed contact 21 is provided to the fixing piece 2. The fixing piece 2 is formed by press working a metal plate (other than a metal plate of copper-titanium alloy, copper-nickel-zinc, brass, or the like) mainly composed of copper or the like, and is embedded in the case body 7 by insert molding. The fixing piece 2 has terminals 22 electrically connected to an external circuit. The terminals 22 protrude outward from the side walls of the end edges of the housing main body 7.
The fixed contact 21 is formed in a position facing the movable contact 41 by cladding, plating, coating, or the like of a material having good conductivity such as copper-silver alloy, gold-silver alloy, or the like, in addition to silver, nickel, and nickel-silver alloy, and is exposed from a part of the opening 73a formed in the housing main body 7.
In the present application, unless otherwise specified, the fixing piece 2 has a surface on which the fixed contact 21 is formed (i.e., an upper surface in fig. 2) as a first surface, and a surface on the opposite side thereof as a second surface. When the direction from the fixed contact 21 toward the movable contact 41 is defined as a first direction and the direction opposite to the first direction is defined as a second direction, the first surface faces the first direction and the second surface faces the second direction. The same applies to other components, such as the movable piece 4 and the thermally responsive element 5.
The movable contact 41 is formed at the front end portion of the movable piece 4 in the longitudinal direction. The movable contact 41 is formed of, for example, the same material as the fixed contact 21, and is joined to the distal end portion of the movable piece 4 by a method such as cladding or caulking (coining) other than welding.
The movable piece 4 is formed into an arm shape symmetrical with respect to a center line in the longitudinal direction by press working a plate-like metal material containing copper or the like as a main component. The movable piece 4 presses the movable contact 41 against the fixed contact 21 to bring them into contact.
A terminal 42 electrically connected to an external circuit is formed at the other end portion of the movable piece 4 in the longitudinal direction. The terminals 42 protrude outward from the side walls of the end edges of the housing main body 7. The movable piece 4 has a fixed portion 43 and an elastic portion 44 between the movable contact 41 and the terminal 42.
The fixing portion 43 is provided between the terminal 42 and the elastic portion 44, and is sandwiched and fixed between the case body 7 and the cover member 8 from both front and back surfaces. Thereby, the position and posture of the movable piece 4 relative to the housing main body 7 are stabilized.
The elastic portion 44 extends from the fixed portion 43 toward the movable contact 41. That is, the movable contact 41 is provided at the tip end portion of the elastic portion 44 extending from the fixed portion 43.
The movable piece 4 is fixed to the fixing portion 43 by the case body 7 and the cover member 8, and the elastic portion 44 is elastically deformed, so that the movable contact 41 formed at the tip of the elastic portion moves in the thickness direction of the movable piece 4, and the distance between the fixed contact 21 and the movable contact 41 varies, thereby opening and closing the thermally responsive switch element 1.
The movable piece 4 is bent or folded in the elastic portion 44 by press working. The degree of bending or bending is not particularly limited as long as the thermally responsive element 5 can be accommodated, and may be appropriately set in consideration of the elastic force at the operating temperature and the recovery temperature, the pressing force of the contact, and the like. A pair of protrusions (contact portions) 44a, 44b are formed on the second surface of the elastic portion 44 so as to face the thermally responsive element 5. The protrusions 44a and 44b contact the thermally responsive element 5, and the deformation of the thermally responsive element 5 is transmitted to the elastic portion 44 via the protrusions 44a and 44b (see fig. 2 and 3).
The thermally responsive element 5 deforms with a change in temperature, thereby operating the movable plate 4. The thermally responsive element 5 is constituted by laminating 2 materials having different thermal expansion coefficients.
The thermally responsive element 5 is formed by laminating thin plates having different thermal expansion coefficients, and is formed by bending the thermally responsive element into an arcuate initial shape. When the operating temperature is reached due to overheating, the curved shape of the thermally responsive member 5 undergoes reverse warpage accompanied by snap-action, and returns when it falls below the return temperature by cooling. The initial shape of the thermally responsive element 5 can be formed by press working. The material and shape of the thermally responsive element 5 are not particularly limited, but from the viewpoints of productivity and efficiency of the anti-warp operation, the thermally responsive element is preferably rectangular, and from the viewpoint of downsizing, the elastic portion 44 is preferably rectangular close to square.
The case main body 7 and the cover member 8 constituting the case 10 are molded from thermoplastic resins such as flame retardant polyamide, polyphenylene sulfide (PPS) excellent in heat resistance, liquid Crystal Polymer (LCP), polybutylene terephthalate (PBT), and the like. Insulating materials other than the resins may be used as long as they can obtain characteristics equal to or higher than those of the resins.
The housing main body 7 is formed with a housing recess 73 which is an internal space for housing the fixed contact 21, the movable piece 4, the thermally responsive element 5, and the like. The housing recess 73 has openings 73a and 73b for housing the movable piece 4, an opening 73c for housing the movable piece 4 and the thermally responsive element 5, and the like. The end edge of the thermally responsive element 5 assembled to the case main body 7 is appropriately abutted by a frame formed in the housing recess 73, and guided at the time of thermal deformation of the thermally responsive element 5.
The cover member 8 is embedded with a cover sheet 9 (see fig. 2) by insert molding. The cover sheet 9 is formed into a plate shape by press working a metal such as copper or the like as a main component or a metal such as stainless steel. As shown in fig. 2 and 3, the cover 9 appropriately abuts against the first surface of the movable piece 4, restricts movement of the movable piece 4, increases rigidity and strength of the cover member 8 and the housing 10 serving as a frame, and contributes to downsizing of the thermally responsive switch element 1.
As shown in fig. 1, the cover member 8 is attached to the housing main body 7 so as to close the openings 73a, 73b, 73c, etc. of the housing main body 7 in which the fixed contact 21, the movable piece 4, the thermally responsive element 5, etc. are housed. The case body 7 and the cover member 8 are joined by, for example, ultrasonic welding. At this time, the case body 7 and the cover member 8 are continuously joined over the entire periphery of the outer edge portions, and the air tightness of the case 10 is improved. As a result, the internal space of the housing 10 due to the storage recess 73 is sealed, and the fixed contact 21, the movable piece 4, the thermally responsive element 5, and other components are blocked from the atmosphere outside the housing 10, so that they can be protected. The fixing portion 43 of the movable piece 4 is welded to the case body 7 and the cover member 8 by ultrasonic welding.
Fig. 2 shows the operation of the thermally responsive switching element 1 at normal temperature. As shown in fig. 1 and 2, the thermo-responsive element 5 of normal temperature maintains an initial shape protruding to the second direction side. The thermally responsive element 5 of the initial shape is abutted against the protrusions 44a and 44b at both ends in the longitudinal direction of the thermally responsive switch element 1. At this time, the thermally responsive member 5 generates an elastic force greater than the elastic force generated by the elastic portion 44 of the movable piece 4, and pushes up the protrusion 44b of the distal end portion of the movable piece 4 in the first direction side, thereby maintaining the movable piece 4 in the blocking state in which the movable contact 41 is separated from the fixed contact 21. Accordingly, joule heat is not generated due to the energization between the fixed plate 2 and the movable plate 4, and therefore, the temperature of the thermally responsive switch element 5 becomes a temperature accurately reflecting the ambient temperature of the thermally responsive switch element 1.
Fig. 3 shows the operation of the thermally responsive switching element 1 at an abnormal temperature. When the ambient temperature of the thermally responsive switch element 1 excessively increases, the thermally responsive element 5 reaching the operating temperature is deformed into a shape protruding toward the first direction side. The operating temperature of the thermally responsive member 5 is, for example, 70 to 90 ℃. With the deformation of the thermally responsive member 5, the force with which the thermally responsive member 5 pushes up the elastic portion 44 disappears or significantly decreases, and the movable contact 41 is pressed to the fixed contact 21 side by the elastic force of the elastic portion 44, thereby making contact with the fixed contact 21. Thereby, the movable piece 4 is shifted to the on state.
In the thermally responsive switch element 1, the thermally responsive element 5 elastically deforms the movable piece 4 in a state where joule heat is not generated, thereby separating the movable contact 41 from the fixed contact 21, and deforms with a change in temperature, thereby operating the movable piece 4 so that the movable contact 41 is brought into contact with the fixed contact 21. Thus, the thermally responsive switch element 1 is not affected by joule heat generated by the fixed contact 21, the movable contact 41, and the movable piece 4, and operates accurately in response to a temperature rise around the thermally responsive switch element 1.
As shown in fig. 2 and 3, the thermally responsive member 5 is constituted of a so-called bimetal having a first layer 51 having a first thermal expansion coefficient and a second layer 52 having a second thermal expansion coefficient higher than the first thermal expansion coefficient. The first layer 51 is made of an alloy such as copper zinc, brass, or stainless steel, for example, including an iron-nickel alloy. The second layer 52 is made of an alloy such as a copper-nickel-manganese alloy or a nickel-chromium-iron alloy. The thermally responsive element 5 may be formed of a three-layer or more laminated structure of three metals or the like.
In the present thermally responsive switch element 1, the first layer 51 is disposed on the fixed contact 21 side and the second layer 52 is disposed on the movable contact 41 side in the thickness direction of the thermally responsive element 5. That is, the first layer 51 is disposed on the second direction side, and the second layer 52 is disposed on the first direction side. With such an arrangement, the fixed contact 21, the movable contact 41, and the thermally responsive element 5 can be arranged side by side in the longitudinal direction of the thermally responsive switch element 1, and the above-described operation can be accurately obtained without increasing the thickness of the thermally responsive switch element 1.
In the thermally responsive switch element 1, the second layer 52 is disposed on the movable piece 4 side in the thickness direction of the thermally responsive element 5. With such an arrangement, the fixed contact 21, the movable contact 41, and the thermally responsive element 5 can be arranged side by side in the longitudinal direction of the thermally responsive switch element 1, and the above-described operation can be accurately obtained without increasing the thickness of the thermally responsive switch element 1.
As shown in fig. 1 to 3, the housing body 7 preferably has a bottom wall 75 and a contact portion 76 that contacts the thermally responsive member 5. The contact portion 76 protrudes from the bottom wall 75 toward the thermally responsive member 5 side and contacts the first layer 51 of the thermally responsive member 5. That is, in fig. 1, the thermally responsive element 5 is placed above the contact portion 76.
As shown in fig. 2, the initially shaped thermally responsive member 5 is in contact with the contact portion 76 at its central portion. Thus, the thermally responsive member 5 is positioned on the first direction side of the bottom wall 75, and the distance from the movable contact 41 to the fixed contact 21 in the blocking state is sufficiently ensured. Therefore, even when the thermally responsive switch element 1 is impacted in some cases, the movable contact 41 can be easily maintained in a state of being separated from the fixed contact 21, and the operation of the thermally responsive switch element 1 can be stabilized.
Fig. 4 shows a housing body 7A as a modification of the housing body 7. The structure of the housing main body 7 described above can be adopted for a portion of the housing main body 7A, which is not described below. The case body 7A has a through hole 77 penetrating the bottom wall 75.
By providing the through hole 77 in the bottom wall 75 of the case body 7A, heat outside the thermally responsive switch element 1 is easily transferred to the thermally responsive element 5 by radiation or convection, and the response performance, sensitivity characteristics, and the like of the thermally responsive switch element 1 are improved. Further, when the response performance of the thermally responsive switching element 1 is improved, the difference between the temperature of the external environment of the thermally responsive switching element 1 and the operating temperature of the thermally responsive element 5 becomes small, and the circuit can be protected more safely.
As shown in fig. 2 and 3, the through hole 77 may penetrate the fixing piece 2 in a manner that the fixing piece 2 extends to the region of the bottom wall 75. The through hole 77 penetrates the fixing piece 2, and heat outside the thermally responsive switch element 1 is easily transferred to the thermally responsive element 5 by radiation and convection. On the other hand, in the structure in which the through hole 77 does not penetrate the fixing piece 2, the air tightness of the accommodating recess 73 in the case 10 is improved. In addition, heat outside the thermally responsive switch element 1 is easily transferred to the thermally responsive element 5 via the terminal 22.
Fig. 5 shows a relationship between the thermally responsive member 5 and the through-hole 77. In a plan view as seen from the thickness direction of the thermally responsive element 5, the through-hole 77 is formed in a region overlapping with a part of the thermally responsive element 5. With such a configuration, heat outside the thermally responsive switch element 1 is more easily transferred to the thermally responsive element 5.
In the case main body 7A, 3 through holes 77 of the same shape are formed. The shape and number of the through holes 77 are arbitrary. A bridge 78 connecting the bottom wall 75 and the contact portion 76 is provided between the through holes 77. The position of the contact portion 76 is stabilized by the bridge portion 78, and the position of the movable contact 41 with respect to the fixed contact 21 is also stabilized.
Fig. 6 shows a circuit 100 comprising a thermally responsive switching element 1. The circuit 100 includes a thermally responsive switching element 1, a power source 101, and a load 102. The power supply 101 applies a driving voltage to the load 102 via the power line 103. In the circuit 100, the thermally responsive switching element 1 is connected in series with a power line 103 connecting a power source 101 and a load 102.
The thermally responsive switching element 1 is provided at or near a portion of a heat source (not shown). The heat source may be a load different from the load 102 within the circuit 100 or may be independent of the circuit 100. The load 102 is a cooling device for cooling a heat source. An example of the cooling device includes an electric fan for cooling a heat source. The cooling device may be a heat exchange device for extracting heat from a heat source, in addition to the electric fan.
In the circuit 100 in the normal operation, the thermally responsive switch element 1 is in an open state in which the movable contact 41 is separated from the fixed contact 21. At this time, the driving voltage of the power supply 101 is not applied to the load 102.
On the other hand, in the circuit 100, when the heat source is overheated, the movable contact 41 comes into contact with the fixed contact 21 with the thermal deformation of the thermally responsive element 5, and the thermally responsive switching element 1 shifts to the closed state. At this time, a driving voltage is applied to the load 102 as a cooling device, and the heat source is cooled. When the temperature of the heat source decreases, the thermally responsive switch element 1 returns to the on state when the thermally responsive element 5 returns to its original shape. The temperature of the heat source is controlled by such a circuit 100.
Fig. 7 shows a circuit diagram of a circuit 100A as a modification of the circuit 100. Like the circuit 100, the circuit 100A includes a thermally responsive switching element 1, a power source 101, and a load 102. The power supply 101 applies a driving voltage to the load 102 via the power line 103. In the circuit 100, the thermally responsive switching element 1 is connected in parallel with the load 102 through a power line 103 connecting the power source 101 and the load 102. In addition, a load (e.g., a resistor 104) different from the load 102 is connected in series with the thermally responsive switching element 1.
In circuit 100A, the heat source includes a load 102 within circuit 100A. The thermally responsive switching element 1 is provided at or near a part of the load 102 as a heat source.
In the circuit 100A in the normal operation, the thermally responsive switch element 1 is in an open state in which the movable contact 41 is separated from the fixed contact 21. At this time, a driving voltage of the power supply 101 is applied to the load 102.
On the other hand, in the circuit 100, when the heat source is overheated, the movable contact 41 comes into contact with the fixed contact 21 with the thermal deformation of the thermally responsive element 5, and the thermally responsive switching element 1 shifts to the closed state. At this time, the driving voltage of the power supply 101 is also applied to the thermally responsive switching element 1, and a part of the current flowing through the load 102 is bypassed. Therefore, the current flowing through the load 102 is limited, and overheating of the load 102 as a heat source is suppressed. When the temperature of the load 102 decreases, the thermally responsive switch element 1 returns to the on state when the thermally responsive element 5 returns to its original shape. The temperature of the heat source is controlled by such a circuit 100.
The thermally responsive switching element 1 of the present invention has been described in detail above, but the present invention is not limited to the above-described specific embodiment, and is implemented in various ways. That is, the thermally responsive switching element 1 includes at least: a fixed contact 21; a movable piece 4 having a movable contact 41, for pressing the movable contact 41 to contact the fixed contact 21; and a thermally responsive element 5 that elastically deforms the movable piece 4 to separate the movable contact 41 from the fixed contact 21, and deforms with a temperature change to actuate the movable piece 4 to bring the movable contact 41 into contact with the fixed contact 21, wherein the thermally responsive element 5 has a first layer 51 having a first thermal expansion coefficient and a second layer 52 having a second thermal expansion coefficient higher than the first thermal expansion coefficient, and the first layer 51 may be disposed on the fixed contact 21 side and the second layer 52 may be disposed on the movable contact 41 side in the thickness direction of the thermally responsive movable element 5.
The thermally responsive switching element 1 includes at least: a fixed contact 21; a movable piece 4 having a movable contact 41, for pressing the movable contact 41 to contact the fixed contact 21; and a thermally responsive element 5 that elastically deforms the movable piece 4 to separate the movable contact 41 from the fixed contact 21, and deforms the movable piece 4 in response to a temperature change to bring the movable contact 41 into contact with the fixed contact 21, wherein the thermally responsive element 5 has a first layer 51 having a first thermal expansion coefficient and a second layer 52 having a second thermal expansion coefficient higher than the first thermal expansion coefficient, and the second layer 52 is arranged on the movable piece 4 side in the thickness direction of the thermally-sensitive movable element 5.
(description of the reference numerals)
1 thermally responsive switching element
4 moving plate
5 thermally responsive element
10 shell body
21 fixed contact
41 movable contact
51 first layer
52 second layer
75 bottom wall
76 contact portion
77 through hole
100 circuit
100A circuit
101 power supply
102 load
103 power lines.
Claims (6)
1. A thermally responsive switching element is provided with:
a fixed contact;
a movable piece having a movable contact and pressing the movable contact to contact the fixed contact; and
a thermally responsive element that elastically deforms the movable piece to separate the movable contact from the fixed contact and deforms with a change in temperature to move the movable piece so that the movable contact contacts the fixed contact,
the thermally responsive element comprises a first layer having a first thermal expansion coefficient and a second layer having a second thermal expansion coefficient higher than the first thermal expansion coefficient,
the first layer is disposed on the fixed contact side and the second layer is disposed on the movable contact side in the thickness direction of the thermally responsive element.
2. A thermally responsive switching element is provided with:
a fixed contact;
a movable piece having a movable contact and pressing the movable contact to contact the fixed contact; and
a thermally responsive element that elastically deforms the movable piece to separate the movable contact from the fixed contact and deforms with a change in temperature to move the movable piece so that the movable contact contacts the fixed contact,
the thermally responsive element comprises a first layer having a first thermal expansion coefficient and a second layer having a second thermal expansion coefficient higher than the first thermal expansion coefficient,
the second layer is disposed on the movable plate side in the thickness direction of the thermally responsive element.
3. The thermally responsive switch element of claim 1 or 2, wherein,
the thermally responsive switch element includes a housing having a space for accommodating the fixed contact, the movable piece, and the thermally responsive element,
the case has a bottom wall and a contact portion protruding from the bottom wall toward the thermally responsive member side and contacting the first layer.
4. The thermally responsive switch element of claim 3 wherein,
in the case, a through hole penetrating the case is formed in a region overlapping with a part of the thermally responsive element in a plan view as viewed from a thickness direction of the thermally responsive element.
5. A circuit, comprising: the thermally responsive switch element of any one of claims 1 to 4; a power supply; the load is applied to the load,
the thermally responsive switching element is connected in series with a power line connecting the power source and the load.
6. A circuit, comprising: the thermally responsive switch element of any one of claims 1 to 4; a power supply; the load is applied to the load,
the thermally responsive switching element is connected in parallel with the load through a power line connecting the power source and the load.
Applications Claiming Priority (3)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP2021-001617 | 2021-01-07 | ||
| JP2021001617A JP7397815B2 (en) | 2021-01-07 | 2021-01-07 | Thermal switching elements and electrical circuits |
| PCT/JP2021/047674 WO2022149475A1 (en) | 2021-01-07 | 2021-12-22 | Heat-responsive switch element, and electric circuit |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN116569296A true CN116569296A (en) | 2023-08-08 |
Family
ID=82357288
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202180082284.1A Pending CN116569296A (en) | 2021-01-07 | 2021-12-22 | Thermally responsive switching element and circuit |
Country Status (3)
| Country | Link |
|---|---|
| JP (1) | JP7397815B2 (en) |
| CN (1) | CN116569296A (en) |
| WO (1) | WO2022149475A1 (en) |
Family Cites Families (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS63187520A (en) * | 1987-01-27 | 1988-08-03 | 松下電工株式会社 | Bimetal switch |
| JP2005149724A (en) * | 1999-05-10 | 2005-06-09 | Masaaki Tone | Current breaker |
| JP2004311352A (en) | 2003-04-10 | 2004-11-04 | Alps Electric Co Ltd | Thermal protector |
| CN201421806Y (en) | 2009-04-20 | 2010-03-10 | 谭才考 | Bimetal-element temperature control switch |
| JP2017103118A (en) * | 2015-12-02 | 2017-06-08 | ボーンズ株式会社 | Breaker, safety circuit with the same, and secondary battery circuit |
| JP2018190514A (en) | 2017-04-28 | 2018-11-29 | ボーンズ株式会社 | Thermally-actuated switch element and electric circuit including the same |
-
2021
- 2021-01-07 JP JP2021001617A patent/JP7397815B2/en active Active
- 2021-12-22 WO PCT/JP2021/047674 patent/WO2022149475A1/en active Application Filing
- 2021-12-22 CN CN202180082284.1A patent/CN116569296A/en active Pending
Also Published As
| Publication number | Publication date |
|---|---|
| JP2022106539A (en) | 2022-07-20 |
| WO2022149475A1 (en) | 2022-07-14 |
| JP7397815B2 (en) | 2023-12-13 |
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