CN112750657A - Protective element and fusible material - Google Patents
Protective element and fusible material Download PDFInfo
- Publication number
- CN112750657A CN112750657A CN201911036975.9A CN201911036975A CN112750657A CN 112750657 A CN112750657 A CN 112750657A CN 201911036975 A CN201911036975 A CN 201911036975A CN 112750657 A CN112750657 A CN 112750657A
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- China
- Prior art keywords
- volume
- cylindrical container
- fusible body
- fusible
- value
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Classifications
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01H—ELECTRIC SWITCHES; RELAYS; SELECTORS; EMERGENCY PROTECTIVE DEVICES
- H01H37/00—Thermally-actuated switches
- H01H37/74—Switches in which only the opening movement or only the closing movement of a contact is effected by heating or cooling
- H01H37/76—Contact member actuated by melting of fusible material, actuated due to burning of combustible material or due to explosion of explosive material
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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
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01H—ELECTRIC SWITCHES; RELAYS; SELECTORS; EMERGENCY PROTECTIVE DEVICES
- H01H37/00—Thermally-actuated switches
- H01H37/02—Details
- H01H37/04—Bases; Housings; Mountings
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01H—ELECTRIC SWITCHES; RELAYS; SELECTORS; EMERGENCY PROTECTIVE DEVICES
- H01H37/00—Thermally-actuated switches
- H01H37/74—Switches in which only the opening movement or only the closing movement of a contact is effected by heating or cooling
- H01H37/76—Contact member actuated by melting of fusible material, actuated due to burning of combustible material or due to explosion of explosive material
- H01H2037/768—Contact member actuated by melting of fusible material, actuated due to burning of combustible material or due to explosion of explosive material characterised by the composition of the fusible material
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- Chemical & Material Sciences (AREA)
- Engineering & Computer Science (AREA)
- Combustion & Propulsion (AREA)
- Fuses (AREA)
Abstract
The invention can inhibit the possibility of the leakage of the fusible body. The protection element 20 includes a cylindrical container 30, a fusible body 32, a first end lead portion 36, a second end lead portion 38, a first end seal 40, and a second end seal 42. The one-end lead portion 36 has one-end linear portion 60 and one-end closed portion 62. The one-end closing portion 62 is conductively connected to the one-end linear portion 60 and conductively connected to one end of the fusible body 32, and closes a boundary between the one-end linear portion 60 and the one end of the fusible body 32 in the internal space of the cylindrical container 30. The other end lead portion 38 has the other end linear portion 66 and the other end closing portion 68. The other-end closing portion 68 is conductively connected to the other-end linear portion 66 and conductively connected to the other end of the fusible body 32, and closes a boundary between the other-end linear portion 66 and the other end of the fusible body 32 in the internal space of the cylindrical container 30.
Description
Technical Field
The present invention relates to a protective element and a material for fusible members.
Background
Patent document 1 discloses a thermal fuse. In this thermal fuse, a meltable material is contained in a cylindrical container. Lead wires are connected to both ends of the fusible body. The lead wire protrudes to the outside from the sealing material provided at the opening portions at both ends of the cylindrical container. The insulating tube covers the lead. The meltable body is a high-temperature type alloy having a melting point of 190 ℃ or higher. According to the thermal fuse disclosed in patent document 1, the amount of adhesive used for bonding the insulating tube and the lead wire can be reduced. According to the thermal fuse disclosed in patent document 1, the adhesive can be prevented from bulging into the sealing material.
Patent document 2 discloses a thermal fuse. The temperature fuse has: a meltable body containing tin; and a pair of lead conductors electrically connected to both end portions of the fusible body, respectively. The surface of the lead conductor of the thermal fuse is plated with a metal made of a tin-copper binary alloy. According to the thermal fuse disclosed in patent document 2, a thermal fuse whose fusing temperature is stable is provided.
Patent document 1: japanese laid-open patent publication No. 2001-357766
Patent document 2: japanese laid-open patent publication No. 2005-101000
However, in the thermal fuse disclosed in patent document 1 and the thermal fuse disclosed in patent document 2, if the cylindrical container is not sealed sufficiently, there is a problem that when the fusible element melts, the fusible element may leak to the outside of the cylindrical container. The present invention has been made to solve such problems. The invention aims to provide a protection element capable of suppressing the possibility of leakage of a fusible body and a material for the fusible body suitable for the protection element.
Disclosure of Invention
The protective element and the fusible material according to the present invention will be described with reference to the accompanying drawings. It should be noted that the reference numerals used in the drawings are used to help understanding the contents of the present invention, and are not intended to limit the contents to the illustrated scope.
In order to solve the above problem, according to an aspect of the present invention, there is provided a protection element 20, including: a cylindrical container 30, a fusible body 32, a first end lead portion 36, a second end lead portion 38, a first end seal 40, and a second end seal 42. The meltable body 32 is contained in the cylindrical container 30. One end lead portion 36 is connected to one end of the fusible body 32. The other end lead portion 38 is connected to the other end of the fusible body 32. The one-end seal 40 seals one end of the cylindrical container 30. The other end seal 42 seals the other end of the cylindrical container 30. The one-end lead portion 36 has one-end linear portion 60 and one-end closed portion 62. The linear end portion 60 protrudes from the cylindrical container 30 through the end seal 40. The terminating portion 62 is conductively connected to the linear portion 60. The one-end closing portion 62 is connected to one end of the fusible body 32 so as to be able to conduct. The one-end closing portion 62 closes a boundary between the one-end linear portion 60 and one end of the meltable material 32 in the inner space of the cylindrical container 30. The other end lead portion 38 has the other end linear portion 66 and the other end closing portion 68. The other end linear portion 66 protrudes from the cylindrical container 30 through the other end seal 42. The other-end closing portion 68 is conductively connected to the other-end linear portion 66. The other-end closing portion 68 is connected to the other end of the fusible body 32 so as to be able to conduct. The other-end closing portion 68 closes the boundary between the other-end linear portion 66 and the other end of the meltable body 32 in the inner space of the cylindrical container 30.
The one-end seal 40 and the other-end seal 42 prevent the melted fusible body 32 from flowing out to the outside of the cylindrical container 30. At this time, the one end seal 40 and the other end seal 42 are damaged by the thermal energy of the melted fusible body 32. If the sealing of the tubular container 30 by the first end seal 40 and the second end seal 42 is insufficient, the damage may be caused, and the first end seal 40 and the second end seal 42 may not prevent the melted fusible body 32 from leaking to the outside of the tubular container 30. The one-end closing portion 62 closes a boundary between the one-end linear portion 60 and one end of the meltable material 32 in the inner space of the cylindrical container 30. The other-end closing portion 68 closes the boundary between the other-end linear portion 66 and the other end of the meltable material 32 in the internal space of the cylindrical container 30. Thus, when the fusible body 32 is melted, the melted fusible body 32 can be suppressed from flowing into the space from the one-end closing portion 62 to the one-end seal 40 and the space from the other-end closing portion 68 to the other-end seal 42 in the internal space of the cylindrical container 30. If the flow of the fusible body 32 to be melted can be suppressed as described above, damage to the first end seal 40 and the second end seal 42 due to thermal energy of the fusible body 32 to be melted can be suppressed as compared with the case where the flow is not suppressed. If damage can be suppressed, the possibility that the fusible body 32 melted due to the damage leaks to the outside of the protection element 20 is reduced. As a result, the protective member 20 having a low possibility of leakage of the molten meltable material 32 to the outside of the protective member 20 is provided.
According to another aspect of the invention, the material for the fusible body contains copper and tin. The value of copper volume% is greater than 0 volume% and 0.9 volume% or less. The value of the volume% of tin is greater than 95.3 volume% and less than 100 volume%.
The fusible material preferably further contains silver. The value of the volume% of silver is more than 0 volume% and 3.8 volume% or less. In this case, it is preferable that the value of volume% of tin is smaller than the value of volume% of copper and the value of volume% of silver subtracted from 100 volume% and the remaining value.
According to the present invention, a protective element capable of suppressing the possibility of leakage of a fusible body and a material for the fusible body suitable for the protective element are provided.
Drawings
Fig. 1 is a sectional view of a protective member according to an embodiment of the present invention.
Wherein the reference numerals are as follows:
20: protective element
30: cylindrical container
32: meltable body
34: coating resin
36: one end lead part
38: the other end of the lead wire
40: one end sealing element
42: sealing element at the other end
60: one end linear part
62: one end closed part
66: the linear part at the other end
68: another end sealing part
Detailed Description
Hereinafter, the present invention will be described in detail with reference to the drawings. In the following description, the same components are denoted by the same reference numerals. The names and functions thereof are the same. Therefore, detailed description thereof will not be repeated.
[ description of the Structure ]
Fig. 1 is a sectional view of a protective element 20 of the present embodiment. The structure of the protection element 20 of the present embodiment will be described with reference to fig. 1.
The protection element 20 of the present embodiment includes: cylindrical container 30, fusible body 32, coating resin 34, one end lead portion 36, the other end lead portion 38, one end seal 40, and the other end seal 42.
The cylindrical container 30 is a container for accommodating the meltable body 32, the coating resin 34, a part of the one-end lead portion 36, and a part of the other-end lead portion 38. In the case of the present embodiment, the cylindrical container 30 has a cylindrical shape. In the present embodiment, the inner peripheral surface of the cylindrical container 30 is smooth. Thus, in the present embodiment, the inner space of the cylindrical container 30 has a cylindrical shape.
The meltable body 32 is contained in the cylindrical container 30. Preferably, the fusible body 32 is composed of a fusible body material described below. The fusible material contains copper, silver and tin. The value of the volume% of copper is preferably more than 0 volume% and 0.9 volume% or less. More preferably, the value of the volume% of copper is 0.7 volume%. The value of the volume% of silver is preferably more than 0 volume% and 3.8 volume% or less. More preferably, the value of volume% of silver is 3.5 volume%. Preferably, the value of the volume% of tin is equal to the value remaining after subtracting the value of the volume% of copper, the value of the volume% of silver and the value of the volume% of unavoidable impurities from 100 volume%. The "inevitable impurities" are substances mixed into the meltable material of the present embodiment during industrial production and satisfy the following conditions. The condition is that the value of the volume% is smaller than a value that would cause the meltable material of the present embodiment to fail to exhibit the predetermined performance. In the present embodiment, the material for the fusible body, which is the material of the fusible body 32, is composed of 0.7 vol% of copper, 3.5 vol% of silver, and 95.8 vol% of tin. However, in this case, the volume% of inevitable impurities in the material for the fusible body is ignored. This is because the volume% of the inevitable impurities is extremely small.
The coating resin 34 coats the meltable body 32. The coating resin 34 transfers heat of the fusible body 32 to the one end lead portion 36 and the other end lead portion 38 when the temperature of the fusible body 32 increases. If heat is transferred from the fusible body 32, the arc is cooled more quickly after the fusible body 32 is blown than it would otherwise be. In the case of the present embodiment, the coating resin 34 contains rosin.
One end lead portion 36 is connected to one end of the fusible body 32. In the present embodiment, the first end lead portion 36 includes a first end linear portion 60 and a first end closed portion 62. The linear end portion 60 protrudes from the cylindrical container 30 through the end seal 40. The terminating portion 62 is conductively connected to the linear portion 60. In the present embodiment, the one-end linear portion 60 is formed integrally with the one-end closed portion 62. In the present embodiment, the one-end linear portion 60 and the one-end closed portion 62 are both made of copper. Tin plating is applied to their surfaces. The one-end closing portion 62 is connected to one end of the fusible body 32 so as to be able to conduct. The one-end closing portion 62 closes a boundary between the one-end linear portion 60 and one end of the meltable material 32 in the inner space of the cylindrical container 30. The closing may be performed so long as the liquid fusible body 32 is prevented from flowing in one direction of the one end seal 40 after the fusible body 32 is fused.
The other end lead portion 38 is connected to the other end of the fusible body 32. In the present embodiment, the other end lead portion 38 includes the other end linear portion 66 and the other end closing portion 68. The other end linear portion 66 protrudes from the cylindrical container 30 through the other end seal 42. The other-end closing portion 68 is conductively connected to the other-end linear portion 66. In the present embodiment, the other-end linear portion 66 and the other-end closed portion 6 are formed integrally with each other. In the present embodiment, the other-end linear portion 66 and the other-end closed portion 68 are both made of copper. Tin plating is applied to their surfaces. The other-end closing portion 68 is connected to the other end of the fusible body 32 so as to be able to conduct. The other-end closing portion 68 closes the boundary between the other-end linear portion 66 and the other end of the meltable body 32 in the inner space of the cylindrical container 30. The sealing may be performed so long as the liquid fusible body 32 is prevented from flowing in one direction of the other end seal 42 after the fusible body 32 is fused.
The one-end seal 40 seals one end of the cylindrical container 30. The other end seal 42 seals the other end of the cylindrical container 30. These specific structures are well known and will not be described in repeated detail herein.
[ description of the production method ]
The method for manufacturing the protection element 20 of the present embodiment is the same as the known method for manufacturing the protection element. Therefore, a detailed description thereof will not be repeated.
[ description of the method of use ]
The protection element 20 of the present embodiment is used in the same manner as a known current fuse. That is, the protection element 20 of the present embodiment is connected to a circuit not shown. When a large current exceeding a predetermined range flows through the fusible body 32, the temperature of the fusible body 32 exceeds the melting point of these materials. Thereby, the fusible body 32 is blown. When an arc is generated after the fusing, the arc is extinguished inside the protective element 20. This blocks the current flow in the circuit to which the protection element 20 is connected.
Description of the effects
In the protection element 20 of the present embodiment, the one end seal 40 and the other end seal 42 prevent the melted fusible body 32 from flowing out of the cylindrical container 30. At this time, the one end seal 40 and the other end seal 42 are damaged by the thermal energy of the melted fusible body 32. If the sealing of the tubular container 30 by the first end seal 40 and the second end seal 42 is insufficient, the damage may be caused, and the first end seal 40 and the second end seal 42 may not prevent the melted fusible body 32 from leaking to the outside of the tubular container 30. The one-end closing portion 62 closes a boundary between the one-end linear portion 60 and one end of the meltable material 32 in the inner space of the cylindrical container 30. The other-end closing portion 68 closes the boundary between the other-end linear portion 66 and the other end of the meltable body 32 in the inner space of the cylindrical container 30. Thus, when the fusible body 32 is melted, the melted fusible body 32 can be suppressed from flowing in the internal space of the cylindrical container 30 to the section from the one end closing portion 62 to the one end seal 40 and the section from the other end closing portion 68 to the other end seal 42. If the flow of the fusible body 32 that is melted can be suppressed, damage to the first end seal 40 and the second end seal 42 due to thermal energy of the melted fusible body 32 can be suppressed, as compared with the case where the flow is not suppressed. If damage can be suppressed, the possibility that the fusible body 32 melted due to the damage leaks to the outside of the protection element 20 is reduced. As a result, the protection element 20 is provided that reduces the possibility of leakage of the fusible body 32 that melts to the outside of the protection element 20.
In addition, when damage to the first end seal 40 and the second end seal 42 due to thermal energy of the fusible body 32 that is melted can be suppressed, the thermal energy of the fusible body 32 at the time of melting can be increased as much as possible. If the thermal energy can be increased in this manner, the temperature at which the meltable material 32 melts can be increased. On the other hand, the fusible body 32 of the protection element 20 of the present embodiment is made of a fusible body material as described below. The fusible material is composed of 0.7 vol% copper, 3.5 vol% silver and 95.8 vol% tin. The melting point of such a meltable material is a value close to 232 degrees celsius. Thus, the fusible body 32 fuses at a high temperature of approximately 232 degrees celsius. As a result, the protection element 20 capable of operating at a high temperature is provided. The fusible material is not limited to the above, and the fusible material satisfying the following conditions may be used as the material of the fusible body 32 of the present embodiment. The first condition is the presence of copper and tin. The second condition is that the value of the volume% of copper is greater than 0 volume% and 0.9 volume% or less. The third condition is that the value of the volume% of tin is equal to the value of the volume% of copper subtracted from 100 volume% and the value of the volume% of unavoidable impurities, and the remaining value.
Description of the modified example
The above-described protective member 20 and the meltable material are examples embodying the technical idea of the present invention. The protective element 20 can be variously modified within the scope of the technical idea of the present invention.
For example, the composition of the fusible material may be 0.7 vol% of copper and 99.3 vol% or more and less than 100 vol% of tin. In this case, the volume% of tin may be 99.3 volume%.
Claims (3)
1. A protective element, comprising:
a cylindrical container;
a fusible body accommodated in the cylindrical container;
a terminal lead portion connected to one end of the fusible body;
a lead portion at the other end connected to the other end of the meltable body;
an end seal member for sealing one end of the cylindrical container; and
a sealing member at the other end for sealing the other end of the cylindrical container,
it is characterized in that the preparation method is characterized in that,
the one-end lead portion has:
a linear end portion protruding from the cylindrical container through the end seal; and
a one-end closing portion that is connected to the one-end linear portion in a conductive manner and to one end of the meltable body in a conductive manner, and that closes a boundary between the one-end linear portion and the one end of the meltable body in the internal space of the cylindrical container,
the other end lead portion includes:
a linear portion at the other end protruding from the cylindrical container through the seal at the other end; and
and a second-end sealing portion which is connected to the second-end linear portion in a conductive manner and to the second end of the meltable body in a conductive manner, and which seals a boundary between the second-end linear portion and the second end of the meltable body in the internal space of the cylindrical container.
2. A material for fusible bodies, comprising:
copper having a value of greater than 0% by volume and less than 0.9% by volume; and
the value of volume% is greater than 95.3 volume% and less than 100 volume% tin.
3. The material for fusible bodies as claimed in claim 2, further comprising:
the value of volume% is greater than 0 volume% and less than 3.8 volume% silver,
the value of the volume% of tin is less than the value remaining from subtracting the values of the volume% of copper and the volume% of silver from 100 volume%.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201911036975.9A CN112750657A (en) | 2019-10-29 | 2019-10-29 | Protective element and fusible material |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201911036975.9A CN112750657A (en) | 2019-10-29 | 2019-10-29 | Protective element and fusible material |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN112750657A true CN112750657A (en) | 2021-05-04 |
Family
ID=75640758
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201911036975.9A Pending CN112750657A (en) | 2019-10-29 | 2019-10-29 | Protective element and fusible material |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN112750657A (en) |
-
2019
- 2019-10-29 CN CN201911036975.9A patent/CN112750657A/en active Pending
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| PB01 | Publication | ||
| PB01 | Publication | ||
| WD01 | Invention patent application deemed withdrawn after publication |
Application publication date: 20210504 |
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| WD01 | Invention patent application deemed withdrawn after publication |