CN210200632U - Overcurrent and overtemperature protector capable of being reset manually in power-off mode - Google Patents
Overcurrent and overtemperature protector capable of being reset manually in power-off mode Download PDFInfo
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- CN210200632U CN210200632U CN201921594121.8U CN201921594121U CN210200632U CN 210200632 U CN210200632 U CN 210200632U CN 201921594121 U CN201921594121 U CN 201921594121U CN 210200632 U CN210200632 U CN 210200632U
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Abstract
The utility model belongs to the technical field of protectors, in particular to an overcurrent and overtemperature protector for manual power-off reset, which comprises a metal shell, a temperature sensing bimetallic strip, a PTC heating element, an insulating pad and a metal bottom plate; a temperature sensing bimetallic strip is arranged inside the metal shell, one end of the temperature sensing bimetallic strip is riveted on a riveting boss of the metal shell, and a movable contact is welded at the other end of the temperature sensing bimetallic strip; the bottom of the metal shell is provided with an insulating pad and a metal bottom plate. The utility model installs the PTC heating element in the fixing device of the metal bottom plate, thereby avoiding the occurrence of the bad phenomena of displacement and falling off of the PTC heating element in the use process of the thermal protector, and further avoiding the failure of the manual power-off reset function of the protector; the metal bottom plate is provided with an insulating pad for electrically isolating the metal shell from the metal bottom plate; the metal bottom plate is provided with a heating wire for realizing the protection function of the thermal protector when abnormal voltage or abnormal current exists.
Description
Technical Field
The utility model belongs to the technical field of the protector, concretely relates to overcurrent excess temperature protector that manual outage resets.
Background
The thermal protector is mainly used for overheat protection of electric tools such as motors and the like. The thermal protector utilizes the bimetal sheet to reach the design temperature, and because the high expansion layer and the low expansion layer of the bimetal sheet have different thermal expansion coefficients, the bimetal sheet rapidly bends to one side to disconnect the electric connection of the movable contact and the fixed contact under the action of different internal stresses of the metal sheets of the high expansion layer and the low expansion layer, thereby realizing the overheat protection device for the circuit or the equipment. When the ambient temperature around the thermal protector is reduced to the reset temperature of the bimetallic strip, the bimetallic strip suddenly jumps again and returns to the initial state, and the movable contact and the fixed contact are electrically connected again, so that the circuit is continuously conducted, and the working function of the electric tool is restored again.
The conventional thermal protector uses only the overheat protection function of the bimetal, and has some difficulty when the power tool or other overheat protection device needs to provide protection even in the case of current abnormality. In addition, when the thermal protector is subjected to overheat protection due to the fact that an electric tool or equipment is abnormal, the traditional thermal protector can automatically reset when the temperature of the bimetallic strip is reduced to the reset temperature, and the power supply is switched on again to enable the motor to continue to work. Such repeated switching on may lead to safety hazards for some powered tools and may also lead to failure or fire risks for powered tools with repeated occurrences of abnormal factors. Therefore, the circuit needs to be manually cut off, and the power supply can be turned on again after the abnormality of the electric tool or the equipment is eliminated. Therefore, an over-temperature protector needing manual power-off reset is provided, and is sensitive to over-temperature and over-current; the circuit can be quickly cut off under the condition of abnormal over-temperature or over-current, the circuit is kept in a cut-off state, and the electric tool or equipment can not work again until the power supply is manually cut off to remove the fault, so that the safety of the electric tool or equipment is improved.
SUMMERY OF THE UTILITY MODEL
To solve the problems set forth in the background art described above. The utility model provides an excessive temperature protector that overflows that manual outage resets to solve above-mentioned problem.
In order to achieve the above object, the utility model provides a following technical scheme: an overcurrent and overtemperature protector reset by manual power failure comprises a metal shell, a temperature sensing bimetallic strip, a PTC heating element, an insulating pad and a metal bottom plate; a temperature sensing bimetallic strip is arranged inside the metal shell, one end of the temperature sensing bimetallic strip is riveted on a riveting boss of the metal shell, and a movable contact is welded at the other end of the temperature sensing bimetallic strip; the bottom of the metal shell is provided with an insulating pad and a metal bottom plate, the insulating pad is arranged above and at the bottom of the metal bottom plate, and the metal bottom plate is provided with a stationary contact through a stationary contact riveting boss; the metal bottom plate is provided with a fixing device and a supporting device of the PTC heating element, the PTC heating element is installed in the fixing device of the metal bottom plate and is respectively in electric contact with the metal bottom plate and the metal shell through the supporting device, the insulating pad is provided with a PTC abdicating hole and a static contact abdicating hole, the PTC heating element passes through the PTC abdicating hole on the insulating pad to be connected with the metal shell, and the static contact passes through the static contact abdicating hole on the insulating pad to be connected with the movable contact.
Preferably, the fixing device is formed by punching a hollow part on the metal base plate, the supporting device is formed by punching a material on the metal base plate, and the fixing device is distributed around the installation position of the PTC heating element or irregularly distributed around the PTC heating element according to the requirement of fixing and installing the PTC heating element; the shape of the fixing device on the metal bottom plate can be a square shape, a cylindrical shape or other shapes which are beneficial to the fixed installation of the PTC heating element; the fixing pieces of the fixing device are arranged into three pieces, four pieces or other numbers.
Preferably, the metal bottom plate is electrically connected with a heating wire.
Preferably, the metal bottom plate is made of copper, stainless steel and metal materials with good iron conductivity.
Preferably, the heating wire is bent and folded and is electrically connected between the two metal bottom plates in an electric welding and riveting mode.
Compared with the prior art, the beneficial effects of the utility model are that:
the utility model installs the PTC heating element in the fixing device of the metal bottom plate, thereby avoiding the occurrence of undesirable phenomena such as displacement, even shedding and the like of the PTC heating element caused by vibration, impact and the like in the moving, transporting and using processes of the electric tool, and further avoiding the failure of the manual power-off reset function of the over-current over-temperature thermal protector which needs manual power-off reset;
the supporting device enables the PTC heating element to be in good electric contact with the metal bottom plate and the metal shell, and avoids the occurrence of bad phenomena that the PTC heating element is in loose contact with the bimetal riveting metal block and the metal bottom plate and the like caused by vibration, impact and the like in the moving, transporting and using processes of the electric tool, so that the manual power-off reset function of the overcurrent and overtemperature thermal protector which needs manual power-off reset can not work continuously, and the overcurrent and overtemperature thermal protector loses effectiveness and recovers work in time, thereby losing the due manual power-off protection function;
the metal bottom plate is provided with an insulating pad for electrically isolating the metal shell from the metal bottom plate;
the metal bottom plate is also provided with a heating wire which is used for rapidly heating when abnormal voltage or abnormal current exists and transferring abnormal heat to the bimetallic strip; the bimetallic strip acts rapidly after experiencing abnormal temperature rise, so that the movable contact and the static contact are separated from contact, and the protection function of the thermal protector is realized.
Drawings
The accompanying drawings are included to provide a further understanding of the invention, and are incorporated in and constitute a part of this specification, illustrate embodiments of the invention, and together with the description serve to explain the invention and not to limit the invention. In the drawings:
fig. 1 is a schematic structural view of an overcurrent and overtemperature protector for manual power-off reset of the present invention;
fig. 2 is a top view of the over-current over-temperature protector for manual power-off reset of the present invention;
FIG. 3 is a schematic cross-sectional view of the over-current over-temperature protector for manual power-off reset of the present invention when not in operation;
fig. 4 is a schematic diagram of the over-current over-temperature protector for manual power-off reset of the present invention when the protector is first turned off;
fig. 5 is an exploded view of the over-current over-temperature protector for manual power-off reset of the present invention;
fig. 6 is a schematic structural view of another metal base plate in the overcurrent over-temperature protector for manual power-off reset of the present invention;
fig. 7 is a schematic structural view of another metal base plate with a heating wire in the overcurrent over-temperature protector with manual power-off reset of the utility model.
Detailed Description
The technical solutions in the embodiments of the present invention will be described clearly and completely with reference to the accompanying drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only some embodiments of the present invention, not all embodiments. Based on the embodiments in the present invention, all other embodiments obtained by a person skilled in the art without creative work belong to the protection scope of the present invention.
Example 1
Referring to fig. 1-6, the present invention provides the following technical solutions: an overcurrent and overtemperature protector reset by manual power failure comprises a metal shell 1, a temperature sensing bimetallic strip 2, a PTC heating element 3, an insulating pad 4 and a metal bottom plate 5; a temperature sensing bimetallic strip 2 is arranged inside the metal shell 1, one end of the temperature sensing bimetallic strip 2 is riveted on a riveting boss of the metal shell 1, and a movable contact 7 is welded at the other end of the temperature sensing bimetallic strip 2; the bottom of the metal shell 1 is provided with an insulating pad 4 and a metal bottom plate 5, the insulating pad 4 is arranged above and at the bottom of the metal bottom plate 5 and used for electrically isolating the metal shell 1 from the metal bottom plate 5, and the metal bottom plate 5 is provided with a stationary contact 8 through a stationary contact riveting boss 51; the metal base plate 5 is provided with a fixing device 53 and a supporting device 52 of the PTC heating element, the PTC heating element 3 is arranged in the fixing device 53 of the metal base plate 5, so that the phenomenon that the PTC heating element shifts and even falls off due to vibration, impact and the like in the moving, transporting and using processes of the electric tool is avoided, the manual power-off reset function of the over-current over-temperature heat protector needing manual power-off reset is failed, the PTC heating element 3 is respectively in electric contact with the metal base plate 5 and the metal shell 1 through the supporting device 52, the phenomenon that the PTC heating element 3 is in loose contact with the bimetal riveting metal block and the metal base plate 5 due to vibration, impact and the like in the moving, transporting and using processes of the electric tool is avoided, and the manual power-off reset function of the over-current over-temperature heat protector needing manual power-off reset can not continuously work, when the insulating pad is failed, the insulating pad recovers to work, the insulating pad 4 is provided with a PTC (positive temperature coefficient) yielding hole and a static contact 8 yielding hole, the PTC heating element 3 penetrates through the PTC yielding hole in the insulating pad 4 to be connected with the metal shell 1, and the static contact 8 penetrates through the static contact 8 yielding hole in the insulating pad 4 to be connected with the movable contact 7.
Specifically, the fixing device 53 is formed by punching a hollow part on the metal bottom plate 5, the supporting device 52 is formed by punching a material on the metal bottom plate 5, and the fixing devices 53 are distributed around the installation position of the PTC heating element 3; the fastening tabs of the fastening device 53 are provided in three, four or other numbers.
Specifically, the metal base plate 5 is made of a metal material with good conductivity such as copper, stainless steel and iron.
In addition, the supporting strips of the supporting device 52 on the metal base plate 5 can be arranged in a cross way or in a parallel way; and may be any geometric shape that facilitates good electrical contact with the supporting PTC heating element, such as square, cylindrical, oval, etc.
Example 2:
as shown in fig. 7, the technical features of embodiment 1 are distinguished: in this embodiment, the metal base plate 5 is composed of two metal base plates and a heating wire 54 connecting and fixing the two metal base plates; the heating wire 54 is bent and folded, and is electrically connected between the two metal bottom plates 5 in an electric welding and riveting mode; when abnormal voltage or abnormal current exists in the circuit, the heating wire 54 rapidly generates heat abnormally; the abnormal heat is rapidly transmitted to the temperature sensing bimetallic strip 2 through the metal bottom plate 5, the fixed contact 8, the movable contact 7 or the small metal plating plate, the PTC heating element 3 and the metal riveting block, so that the temperature sensing bimetallic strip 2 rapidly acts, the electric connection between the movable contact 7 and the fixed contact 8 is disconnected, and the abnormal protection of the circuit is realized; after the temperature sensing bimetal 2 is operated, abnormal current flows through the PTC heating element 3, and the PTC heating element 3 continuously heats, so that the temperature sensing bimetal 2 keeps a disconnected state; the circuit can not be reconnected until the circuit is manually disconnected and the queuing circuit is failed, and the electric tool or equipment can not start to work again.
Finally, it should be noted that: although the present invention has been described in detail with reference to the foregoing embodiments, it will be apparent to those skilled in the art that modifications may be made to the embodiments described in the foregoing embodiments, or equivalents may be substituted for elements thereof. Any modification, equivalent replacement, or improvement made within the spirit and principle of the present invention should be included in the protection scope of the present invention.
Claims (5)
1. The utility model provides an overcurrent excess temperature protector that manual outage resets which characterized in that: comprises a metal shell (1), a temperature-sensing bimetallic strip (2), a PTC heating element (3), an insulating pad (4) and a metal bottom plate (5); a temperature sensing bimetallic strip (2) is arranged inside the metal shell (1), one end of the temperature sensing bimetallic strip (2) is riveted on a riveting boss of the metal shell (1), and a movable contact (7) is welded at the other end of the temperature sensing bimetallic strip (2); the bottom of the metal shell (1) is provided with an insulating pad (4) and a metal bottom plate (5), the insulating pad (4) is arranged above and at the bottom of the metal bottom plate (5), and the metal bottom plate (5) is provided with a static contact (8) through a static contact riveting boss (51); the PTC heating element fixing device (53) and the supporting device (52) are arranged on the metal base plate (5), the PTC heating element (3) is installed in the fixing device (53) of the metal base plate (5), the PTC heating element (3) is in electrical contact with the metal base plate (5) and the metal shell (1) through the supporting device (52), the insulating pad (4) is provided with a PTC yielding hole and a static contact (8) yielding hole, the PTC heating element (3) penetrates through the PTC yielding hole in the insulating pad (4) to be connected with the metal shell (1), and the static contact (8) penetrates through the static contact (8) yielding hole in the insulating pad (4) to be connected with the movable contact (7).
2. The manual power-off reset over-current and over-temperature protector as claimed in claim 1, wherein: the fixing device (53) is formed by punching a hollow part on the metal bottom plate (5), the supporting device (52) is formed by punching a material on the metal bottom plate (5), and the fixing device (53) is distributed on the periphery of the installation position of the PTC heating element (3); the fixing pieces of the fixing device (53) are three or four.
3. The manual power-off reset over-current and over-temperature protector as claimed in claim 1, wherein: the metal bottom plate (5) is provided with a heating wire (54) in an electrically connecting manner.
4. The manual power-off reset over-current and over-temperature protector as claimed in claim 1, wherein: the metal bottom plate (5) is made of metal materials such as copper, stainless steel and iron.
5. The manual power-off reset over-current and over-temperature protector according to claim 3, characterized in that: the heating wire (54) is bent and folded and is electrically connected between the two metal bottom plates (5) in an electric welding and riveting mode.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201921594121.8U CN210200632U (en) | 2019-09-24 | 2019-09-24 | Overcurrent and overtemperature protector capable of being reset manually in power-off mode |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201921594121.8U CN210200632U (en) | 2019-09-24 | 2019-09-24 | Overcurrent and overtemperature protector capable of being reset manually in power-off mode |
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| Publication Number | Publication Date |
|---|---|
| CN210200632U true CN210200632U (en) | 2020-03-27 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201921594121.8U Active CN210200632U (en) | 2019-09-24 | 2019-09-24 | Overcurrent and overtemperature protector capable of being reset manually in power-off mode |
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| CN (1) | CN210200632U (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN112216554A (en) * | 2020-09-28 | 2021-01-12 | 常熟新都安电器股份有限公司 | Overcurrent thermal protector |
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2019
- 2019-09-24 CN CN201921594121.8U patent/CN210200632U/en active Active
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN112216554A (en) * | 2020-09-28 | 2021-01-12 | 常熟新都安电器股份有限公司 | Overcurrent thermal protector |
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Address after: No.6, Hongjian Road, jiaomei Town, Taiwan investment zone, Zhangzhou City, Fujian Province, 363000 Patentee after: Zhangzhou Yabao Electronics Co.,Ltd. Address before: 363007 Hongjian Industrial Zone, Longchi Development Zone, Zhangzhou City, Fujian Province Patentee before: ZHANGZHOU YABAO ELECTRONIC Co.,Ltd. |