CN104217896B - A kind of built-in overcurrent overheat protector - Google Patents
A kind of built-in overcurrent overheat protector Download PDFInfo
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- CN104217896B CN104217896B CN201410467477.0A CN201410467477A CN104217896B CN 104217896 B CN104217896 B CN 104217896B CN 201410467477 A CN201410467477 A CN 201410467477A CN 104217896 B CN104217896 B CN 104217896B
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- base plate
- helium
- nitrogen
- resistive heater
- mixing gas
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- Thermally Actuated Switches (AREA)
Abstract
The invention discloses a kind of built-in overcurrent overheat protector, metal shell including bottom opening, the metal base plate of closure bottom opening, be provided with moving contact and reverse when reaching design temperature, lower than design temperature time the thermal plate that resets, the static contact of layout corresponding to moving contact and resistive heater and two binding posts; Two binding post upper ends are each passed through in the confined space that base plate stretches into shell and base plate composition; static contact is fixedly mounted on the upper end of one of them binding post; one end of resistive heater is fixedly mounted on the upper end of another binding post; the other end of resistive heater is fixing with base plate to be connected; in confined space, envelope has mixing gas; the resistance value of described resistive heater is 1��220 milliohm; the contact heat transfer protective gas that mixing gas is made up of helium and nitrogen; and the percent by volume of helium and nitrogen is helium 10��15%, nitrogen 85��90%. Protection precision of the present invention and security performance are higher, use wider.
Description
Technical field
The present invention relates to a kind of thermal protector, particularly relate to a kind of when the electricity equipment overcurrent overheat such as three phase electric machine, compressor, can automatically power off, it is prevented that the built-in overcurrent overheat protector of its damage.
Background technology
Existing built-in overcurrent overheat protector, metal shell including bottom opening, close the metal base plate of described outer casing bottom opening, be provided with moving contact and when reaching design temperature reverse, lower than design temperature time reset thermal plate, the static contact of layout corresponding to described moving contact, and heater and two binding posts; The upper end of described two binding posts is each passed through in the confined space that described base plate stretches into shell and base plate composition, the shaft of described two binding posts is connected with described base plate insulated enclosure respectively, described static contact is fixedly mounted on the upper end of one of them binding post, one end of described heater is fixedly mounted on the upper end of another binding post, the other end of heater is fixing with described base plate to be connected, and in described confined space, envelope has mixing gas.
In above-mentioned thermal protector; described heater generally adopts the hot plate of number Europe, the big resistance value in even tens of Europe; described mixing gas generally adopts helium and nitrogen or the contact heat transfer protective gas of carbon dioxide composition, and the percent by volume shared by helium is generally between 50��95%. The shortcoming that these thermal protectors operationally exist the following aspects: on the one hand, owing to the resistance value of heater is bigger, the protection span making thermal protector is excessive, namely during overcurrent overheat, make thermal protector send reaction thus the operating temperature interval cut off the electricity supply is excessive, cause that protection precision is relatively low; On the other hand, the helium proportion owing to being used for conducting heat in mixing gas is more so that for preventing that the nitrogen proportion of electric arc is less, cause that security performance is relatively low; Another further aspect, the power interval that this thermal protector matches with compressor or motor is less, causes that the use scope of thermal protector is narrower.
Summary of the invention
It is little that the technical problem to be solved in the present invention is to provide a kind of protection span, and protection precision is high, protects more in time, and security performance is more reliable, and uses wider built-in overcurrent overheat protector.
For solving above-mentioned technical problem, the present invention adopts the built-in overcurrent overheat protector of such a, for the failure of current when overcurrent overheat operating mode by compressor or motor, it includes the metal shell of bottom opening, close the metal base plate of described outer casing bottom opening, be provided with moving contact and reverse when reaching design temperature, lower than design temperature time the thermal plate that resets, the static contact of layout corresponding to described moving contact, and resistive heater and two binding posts, the upper end of described two binding posts is each passed through in the confined space that described base plate stretches into shell and base plate composition, the shaft of described two binding posts is connected with described base plate insulated enclosure respectively, described static contact is fixedly mounted on the upper end of one of them binding post, one end of described resistive heater is fixedly mounted on the upper end of another binding post, the other end of resistive heater is fixing with described base plate to be connected, in described confined space, envelope has mixing gas, the resistance value of described resistive heater is 1��220 milliohm, the contact heat transfer protective gas that described mixing gas is made up of helium and nitrogen, and the percent by volume of helium and nitrogen is helium 10��15%, nitrogen 85��90%.
As a kind of preferred implementation of the present invention, described mixing gas pressure at normal temperatures is 15200��25300 handkerchiefs.
As a modification of the present invention, the resistance value of described resistive heater is 20��200 milliohms, and the percent by volume of described helium and nitrogen is helium 13%, and nitrogen 87%, described mixing gas pressure at normal temperatures is 20300 handkerchiefs.
After adopting such structure, the method have the advantages that
Owing to the present invention adopts the heating wire of 1��220 extremely low resistance value of milliohm, mixing gas adopts percent by volume to be only the helium of 10��15%, the heating wire of this extremely low resistance value and only mixing gas containing 10��15% helium with the use of time, the protection span that can make thermal protector is substantially reduced, that is, when overcurrent overheat, the operating temperature interval that thermal protector is cut off the electricity supply is made to be substantially reduced, so that the reaction of thermal protector is sensitiveer, protection precision is higher, protection is more in time quickly, simultaneously because the content of nitrogen is 85��90%, it is thus possible to be better protected from the generation of electric arc, substantially increase security performance, ensure that thermal protector can work more reliably, effectively prevent the damage of the electricity equipment such as motor. it addition, the thermal protector of the present invention is in use, bigger with the power interval that compressor or motor match, use wider.
It is 15200��25300 handkerchiefs that the present invention mixes gas pressure at normal temperatures; it is preferably 20300 handkerchiefs; the resistance value of resistive heater is preferably 20��200 milliohms; the percent by volume of helium and nitrogen is preferably helium 13%; nitrogen 87%; such with the use of, can make thermal protector that the reaction of variations in temperature is sensitiveer, can guarantee that thermal protector works more reliably.
Accompanying drawing explanation
Below in conjunction with accompanying drawing, the specific embodiment of the present invention is described in further detail.
Fig. 1 is a kind of structural representation of the built-in overcurrent overheat protector of the present invention.
Fig. 2 is the schematic top plan view of resistive heater in the present invention.
Detailed description of the invention
Referring to Fig. 1, the built-in overcurrent overheat protector of one shown in 2, for the failure of current when overcurrent overheat operating mode by compressor or motor, it includes the metal shell 1 of bottom opening, metal base plate 2 by shell described in welded closure 1 bottom opening, be provided with moving contact 3 and when reaching design temperature reverse, lower than design temperature time reset thermal plate 4, the static contact 5 of layout corresponding to described moving contact 3, and resistive heater 6 and two binding posts 7,8;Described two binding posts 7, the upper end of 8 is each passed through in the confined space 9 that described base plate 2 stretches into shell 1 and base plate 2 composition, described two binding posts 7, the shaft of 8 is connected with described base plate 2 insulated enclosure respectively through insulating glass 10, described static contact 5 is fixedly mounted on one of them binding post 7 by support plate 11, the upper end of 8, it it is the upper end of binding post 7 shown in figure, one end 6-1 of described resistive heater 6 is arranged on another binding post 7 by being welded and fixed, the upper end of 8, it it is the upper end of binding post 8 shown in figure, the other end 6-2 of resistive heater 6 is connected by a bearing 12 is fixing with described base plate 2, in described confined space 9, envelope has mixing gas, the resistance value of described resistive heater 6 is 1��220 milliohm, the contact heat transfer protective gas that described mixing gas is made up of helium and nitrogen, and the percent by volume of helium and nitrogen is helium 10��15%, nitrogen 85��90%.
In the present invention, described thermal plate 4 is bimetal leaf or three sheet metals.
In the present invention, described mixing gas pressure at normal temperatures is 15200��25300 handkerchiefs. The resistance value of described resistive heater 6 is preferably the percent by volume of 20��200 milliohms, described helium and nitrogen and is preferably helium 13%, nitrogen 87%, and described mixing gas pressure at normal temperatures is preferably 20300 handkerchiefs. After adopting such structure, can make thermal protector that the reaction of variations in temperature is sensitiveer, can guarantee that thermal protector works more reliably.
The power interval that the thermal protector of the present invention matches with compressor or motor is 750��5000W, uses scope wide.
The present invention is when overcurrent overheat state; when the temperature in confined space 9 exceedes normal temperature 80��90 degree; in thermal protector, thermal plate 4 reverses immediately thus cutting off the electricity supply, it is ensured that thermal protector can reliably work, and effectively prevent the damage of the electricity equipment such as compressor or motor.
Thermal protector of the present invention may be provided at the inside of the electricity equipment such as motor, and its space taken is little, simple in construction, dependable performance, and the electricity equipment such as motor are played a very good protection.
Claims (3)
1. a built-in overcurrent overheat protector, for the failure of current when overcurrent overheat operating mode by compressor or motor, it includes the metal shell (1) of bottom opening, close the metal base plate (2) of described shell (1) bottom opening, be provided with moving contact (3) and when reaching design temperature reverse, lower than design temperature time reset thermal plate (4), the static contact (5) of layout corresponding to described moving contact (3), and resistive heater (6) and two binding posts (7,8), described two binding posts (7, 8) upper end is each passed through described base plate (2) and stretches in the confined space (9) that shell (1) and base plate (2) are constituted, described two binding posts (7, 8) shaft is connected with described base plate (2) insulated enclosure respectively, described static contact (5) is fixedly mounted on one of them binding post (7, 8) upper end, one end of described resistive heater (6) is fixedly mounted on another binding post (7, 8) upper end, the other end of resistive heater (6) is fixing with described base plate (2) to be connected, in described confined space (9), envelope has mixing gas, it is characterized in that: the resistance value of described resistive heater (6) is 1��220 milliohm, the contact heat transfer protective gas that described mixing gas is made up of helium and nitrogen, and the percent by volume of helium and nitrogen is helium 10��15%, nitrogen 85��90%.
2. built-in overcurrent overheat protector according to claim 1, it is characterised in that: described mixing gas pressure at normal temperatures is 15200��25300 handkerchiefs.
3. built-in overcurrent overheat protector according to claim 2; it is characterized in that: the resistance value of described resistive heater (6) is 20��200 milliohms; the percent by volume of described helium and nitrogen is helium 13%, and nitrogen 87%, described mixing gas pressure at normal temperatures is 20300 handkerchiefs.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201410467477.0A CN104217896B (en) | 2014-09-15 | 2014-09-15 | A kind of built-in overcurrent overheat protector |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201410467477.0A CN104217896B (en) | 2014-09-15 | 2014-09-15 | A kind of built-in overcurrent overheat protector |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN104217896A CN104217896A (en) | 2014-12-17 |
| CN104217896B true CN104217896B (en) | 2016-06-08 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201410467477.0A Active CN104217896B (en) | 2014-09-15 | 2014-09-15 | A kind of built-in overcurrent overheat protector |
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| Country | Link |
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| CN (1) | CN104217896B (en) |
Families Citing this family (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN107611926B (en) | 2017-09-15 | 2020-11-06 | 珠海格力电器股份有限公司 | Overload protection device and method, storage medium, compressor and electric appliance |
Family Cites Families (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH10144189A (en) * | 1996-11-08 | 1998-05-29 | Ubukata Seisakusho:Kk | Thermally-actuated switch |
| JP2005240596A (en) * | 2004-02-24 | 2005-09-08 | Ubukata Industries Co Ltd | Protective device for electric compressor |
| CN100572817C (en) * | 2005-08-03 | 2009-12-23 | 周娟 | A kind of air-tight compressor thermal protector |
| BRPI0716646B1 (en) * | 2006-08-10 | 2018-07-31 | Ubukata Industries Co., Ltd. | THERMAL RESPONSE SWITCH |
| CN201173191Y (en) * | 2008-02-26 | 2008-12-31 | 匡法荣 | Electric compressor protector |
| CN102005333A (en) * | 2010-11-30 | 2011-04-06 | 苏州华旃航天电器有限公司 | Single-phase compressor protector |
| CN102426982A (en) * | 2011-09-21 | 2012-04-25 | 上海航天科工电器研究院有限公司 | Built-in protector for compressor |
| CN202651020U (en) * | 2012-06-15 | 2013-01-02 | 匡法荣 | Overcurrent and overheating electrical protector |
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2014
- 2014-09-15 CN CN201410467477.0A patent/CN104217896B/en active Active
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| CN104217896A (en) | 2014-12-17 |
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Effective date of registration: 20170119 Address after: 213031 Jiangsu Province, Changzhou City New District No. 99 new road Patentee after: Changzhou evergreen Electric Appliance Co., Ltd. Address before: 213127 Jiangsu province Changzhou City New District Chang Heng garden 35 room 402 Patentee before: Kuang Chengxiao |
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Effective date of registration: 20191113 Address after: 213031 Building No. 6 Information Avenue, Longhutang Street, Xinbei District, Changzhou City, Jiangsu Province Patentee after: Jiangsu Changrong Electrical Appliance Co., Ltd. Address before: 213031 Jiangsu Province, Changzhou City New District No. 99 new road Patentee before: Changzhou evergreen Electric Appliance Co., Ltd. |
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| CP03 | Change of name, title or address | ||
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Address after: No.2, information Avenue, Xinbei District, Changzhou City, Jiangsu Province Patentee after: Jiangsu Changrong Electric Appliance Co., Ltd Address before: 213031 Building No. 6 Information Avenue, Longhutang Street, Xinbei District, Changzhou City, Jiangsu Province Patentee before: JIANGSU CHANGRONG ELECTRICAL APPLIANCE Co.,Ltd. |