CN103489709A - Electromagnetic type thermal relay - Google Patents

Electromagnetic type thermal relay Download PDF

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Publication number
CN103489709A
CN103489709A CN201310438320.0A CN201310438320A CN103489709A CN 103489709 A CN103489709 A CN 103489709A CN 201310438320 A CN201310438320 A CN 201310438320A CN 103489709 A CN103489709 A CN 103489709A
Authority
CN
China
Prior art keywords
contact
normally
thermal relay
electromagnetic type
type thermal
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Pending
Application number
CN201310438320.0A
Other languages
Chinese (zh)
Inventor
周军
范康林
陈梦军
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
State Grid Corp of China SGCC
State Grid Sichuan Electric Power Co Ltd
Original Assignee
State Grid Corp of China SGCC
State Grid Sichuan Electric Power Co Ltd
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by State Grid Corp of China SGCC, State Grid Sichuan Electric Power Co Ltd filed Critical State Grid Corp of China SGCC
Priority to CN201310438320.0A priority Critical patent/CN103489709A/en
Publication of CN103489709A publication Critical patent/CN103489709A/en
Pending legal-status Critical Current

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Abstract

The invention relates to the field of relays, in particular to an electromagnetic type thermal relay. The electromagnetic type thermal relay comprises a normally-open contact (1), a normally-closed contact (2), a metal contact chip (3) and a bimetallic strip (11). The electromagnetic type thermal relay is characterized in that one end of the metal contact chip (3) is fixedly hinged to the inside of a thermal relay body through a shaft (5), and the other end of the metal contact chip (3) is movably arranged between the normally-open contact (1) and the normally-closed contact (2) and makes contact with the normally-closed contact (2) through stretch of a reset spring (4). The normally-closed contact (2) and the metal contact chip (3) are connected on a main circuit in series. An electromagnet (7) is arranged on one side, the same as the normally-open contact (1), of the metal contact chip (3), and the electromagnet (7) is in series connection in a control loop formed by serial connection of a power source (8), a protective resistor (9) and a switch (10). One end of the bimetallic strip (11) is arranged on the main circuit. According to the electromagnetic type thermal relay, anti-interference performance is improved greatly, and sensitivity is improved.

Description

A kind of electromagnetic type thermal relay
Technical field
The present invention relates to the relay field, be specifically related to a kind of electromagnetic type thermal relay.
Background technology
Thermal relay is to produce heat by the electric current that flows into thermal element, makes the bimetal leaf generation deformation of the different coefficients of expansion, when deformation reaches certain distance; just promote the connecting rod action, control circuit is disconnected, thereby make the contactor dead electricity; main circuit disconnects, and realizes the overload protection of motor.Thermal relay is as the overload protection element of motor, and little with its volume, simple in structure, low cost and other advantages is widely applied aborning.At present, the thermal relay overwhelming majority on the market is all by heater element, bimetal leaf to be heated, and makes bimetal leaf generation deformation, promotes the push rod action, control circuit is disconnected, thereby make the contactor dead electricity, and main circuit disconnects.This thermal relay is actual usually can not execution due to the fault of push rod in using, and can not make main circuit disconnect, or when some bimetal leaf due to other factors impacts, in the time of can not normally deformation occurring, also can make the thermal relay cisco unity malfunction.
Summary of the invention
The object of the present invention is to provide a kind of electromagnetic type thermal relay, solve because sheet metal thermal expansion distortion is not obvious, or push rod breaks down, cause the sensitive not problem of thermal relay reaction.
For solving above-mentioned technical problem, the present invention by the following technical solutions: a kind of electromagnetic type thermal relay comprises normally opened contact, normally-closed contact, Metal Contact sheet and bimetal leaf; One end of described Metal Contact sheet is fixedly hinged in thermal relay inside by axle, the other end is movably arranged between normally opened contact and normally-closed contact, and this other end is because the stretching of back-moving spring contacts with normally-closed contact, and described normally-closed contact and Metal Contact sheet are serially connected on main circuit; Be positioned at Metal Contact sheet the same side with normally opened contact and be provided with electromagnet; electromagnet is serially connected in the control loop be composed in series by power supply, protective resistance and switch; described bimetal leaf is that an end is arranged on main circuit; the other end withstands on the movable contact spring of switch, and after temperature distortion, described bimetal leaf drives the movable contact spring closure of switch.
Further technical scheme is, described and normally opened contact is positioned at Metal Contact sheet the same side and is provided with reset button.
Further technical scheme is, described switch has more than two, parallel with one another in control loop, and each switch mates bimetal leaf.
Further technical scheme is, described reset button comprises button shell, contact block and spring, and described button shell covers on contact block, contact block bottom socket spring, and the end of described contact block is near described Metal Contact sheet.
Compared with prior art, the invention has the beneficial effects as follows: this electromagnetic type thermal relay is greatly improved on anti-interference, has avoided push rod to break down and can't move the situation that causes the thermal relay cisco unity malfunction, has improved sensitivity.
The accompanying drawing explanation
The connection diagram that Fig. 1 is a kind of electromagnetic type thermal relay of the present invention.
Embodiment
In order to make purpose of the present invention, technical scheme and advantage clearer, below in conjunction with drawings and Examples, the present invention is further elaborated.Should be appreciated that specific embodiment described herein, only in order to explain the present invention, is not intended to limit the present invention.
Fig. 1 shows an embodiment of a kind of electromagnetic type thermal relay of the present invention: a kind of electromagnetic type thermal relay comprises normally opened contact 1, normally-closed contact 2, Metal Contact sheet 3 and bimetal leaf 11; One end of described Metal Contact sheet 3 is fixedly hinged in thermal relay inside by axle 5, the other end is movably arranged between normally opened contact 1 and normally-closed contact 2, and this other end is because the stretching of back-moving spring 4 contacts with normally-closed contact 2, and described normally-closed contact 2 and Metal Contact sheet 3 are serially connected on main circuit; Be positioned at Metal Contact sheet 3 the same sides with normally opened contact 1 and be provided with electromagnet 7; electromagnet 7 is serially connected in the control loop be composed in series by power supply 8, protective resistance 9 and switch 10; described bimetal leaf 11 is that an end is arranged on main circuit; the other end withstands on the movable contact spring of switch 10, and after temperature distortion, described bimetal leaf 11 drives the movable contact spring closure of switch 10.
A kind of electromagnetic type thermal relay preferred embodiment according to the present invention: a kind of electromagnetic type thermal relay comprises normally opened contact 1, normally-closed contact 2, Metal Contact sheet 3 and bimetal leaf 11; One end of described Metal Contact sheet 3 is fixedly hinged in thermal relay inside by axle 5, the other end is movably arranged between normally opened contact 1 and normally-closed contact 2, and this other end is because the stretching of back-moving spring 4 contacts with normally-closed contact 2, and described normally-closed contact 2 and Metal Contact sheet 3 are serially connected on main circuit; Be positioned at Metal Contact sheet 3 the same sides with normally opened contact 1 and be provided with electromagnet 7, electromagnet 7 is serially connected in the control loop be composed in series by power supply 8, protective resistance 9 and switch 10, described bimetal leaf 11 is that an end is arranged on main circuit, the other end withstands on the movable contact spring of switch 10, and after temperature distortion, described bimetal leaf 11 drives the movable contact spring closure of switch 10; Described and normally opened contact 1 is positioned at Metal Contact sheet 3 the same sides and is provided with reset button 6, and this reset button 6 allows thermal relay reply normal operating conditions after overhauling for breaking down again.
Another preferred embodiment of a kind of electromagnetic type thermal relay according to the present invention: a kind of electromagnetic type thermal relay comprises normally opened contact 1, normally-closed contact 2, Metal Contact sheet 3 and bimetal leaf 11; One end of described Metal Contact sheet 3 is fixedly hinged in thermal relay inside by axle 5, the other end is movably arranged between normally opened contact 1 and normally-closed contact 2, and this other end is because the stretching of back-moving spring 4 contacts with normally-closed contact 2, and described normally-closed contact 2 and Metal Contact sheet 3 are serially connected on main circuit; Be positioned at Metal Contact sheet 3 the same sides with normally opened contact 1 and be provided with electromagnet 7, electromagnet 7 is serially connected in the control loop be composed in series by power supply 8, protective resistance 9 and switch 10, described bimetal leaf 11 is that an end is arranged on main circuit, the other end withstands on the movable contact spring of switch 10, and after temperature distortion, described bimetal leaf 11 drives the movable contact spring closure of switch 10; Described switch 10 has more than two; parallel with one another in control loop, each switch 10 couplings have bimetal leaf 11, only need wherein the work in combination of one group of bimetal leaf 11 and switch 10; can play the effect of protection main circuit, the reliability and the sensitivity that have improved greatly thermal relay.
Another preferred embodiment of a kind of electromagnetic type thermal relay according to the present invention: a kind of electromagnetic type thermal relay comprises normally opened contact 1, normally-closed contact 2, Metal Contact sheet 3 and bimetal leaf 11; One end of described Metal Contact sheet 3 is fixedly hinged in thermal relay inside by axle 5, the other end is movably arranged between normally opened contact 1 and normally-closed contact 2, and this other end is because the stretching of back-moving spring 4 contacts with normally-closed contact 2, and described normally-closed contact 2 and Metal Contact sheet 3 are serially connected on main circuit; Be positioned at Metal Contact sheet 3 the same sides with normally opened contact 1 and be provided with electromagnet 7, electromagnet 7 is serially connected in the control loop be composed in series by power supply 8, protective resistance 9 and switch 10, described bimetal leaf 11 is that an end is arranged on main circuit, the other end withstands on the movable contact spring of switch 10, and after temperature distortion, described bimetal leaf 11 drives the movable contact spring closure of switch 10; Described reset button 6 comprises button shell, contact block and spring, and described button shell covers on contact block, contact block bottom socket spring, and the end of described contact block is near described Metal Contact sheet 3.
Operation principle of the present invention is: thermal relay when normal operation, and the bimetal leaf 11 generation deformation of being heated, but deformation deficiency under normal circumstances is so that switch 10 closures, and now Metal Contact sheet 3 is placed on normally-closed contact 2; When overload situations appears in main circuit, electric current in main circuit increases, make the temperature of bimetal leaf 11 continue to rise, larger deformation occurs, bimetal leaf 11 pull switch 10 closures, electromagnet 7 energisings attract Metal Contact sheet 3, now Metal Contact sheet 3 leaves normally-closed contact 2, is placed on normally opened contact 1, and control circuit is disconnected, thereby make the contactor dead electricity, main circuit disconnects.After bimetal leaf 11 is cooling, press reset button 6, now iron staff 3 is placed on normally-closed contact 2 again.

Claims (4)

1. an electromagnetic type thermal relay, is characterized in that: comprise normally opened contact (1), normally-closed contact (2), Metal Contact sheet (3) and bimetal leaf (11); One end of described Metal Contact sheet (3) is fixedly hinged in thermal relay inside by axle (5), the other end is movably arranged between normally opened contact (1) and normally-closed contact (2), and this other end is because the stretching of back-moving spring (4) contacts with normally-closed contact (2), and described normally-closed contact (2) and Metal Contact sheet (3) are serially connected on main circuit; With normally opened contact (1) is positioned at Metal Contact sheet (3) the same side and is provided with electromagnet (7); electromagnet (7) is serially connected in the control loop be composed in series by power supply (8), protective resistance (9) and switch (10); described bimetal leaf (11) is that an end is arranged on main circuit; the other end withstands on the movable contact spring of switch (10), and after temperature distortion, described bimetal leaf (11) drives the movable contact spring closure of switch (10).
2. a kind of electromagnetic type thermal relay according to claim 1, it is characterized in that: described and normally opened contact (1) is positioned at Metal Contact sheet (3) the same side and is provided with reset button (6).
3. a kind of electromagnetic type thermal relay according to claim 1, it is characterized in that: described switch (10) has more than two, parallel with one another in control loop, and each switch (10) coupling has bimetal leaf (11).
4. a kind of electromagnetic type thermal relay according to claim 1, it is characterized in that: described reset button (6) comprises button shell, contact block and spring, described button shell covers on contact block, contact block bottom socket spring, the end of described contact block is near described Metal Contact sheet (3).
CN201310438320.0A 2013-09-24 2013-09-24 Electromagnetic type thermal relay Pending CN103489709A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
CN201310438320.0A CN103489709A (en) 2013-09-24 2013-09-24 Electromagnetic type thermal relay

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
CN201310438320.0A CN103489709A (en) 2013-09-24 2013-09-24 Electromagnetic type thermal relay

Publications (1)

Publication Number Publication Date
CN103489709A true CN103489709A (en) 2014-01-01

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CN201310438320.0A Pending CN103489709A (en) 2013-09-24 2013-09-24 Electromagnetic type thermal relay

Country Status (1)

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CN (1) CN103489709A (en)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN109243127A (en) * 2018-11-15 2019-01-18 中国直升机设计研究所 A kind of reflexive two-way fire detector

Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4075594A (en) * 1975-08-15 1978-02-21 Uchiya Co., Ltd. Thermostat with reset arm
CN2051340U (en) * 1989-03-21 1990-01-17 潘力田 Automatic-control electric-heating kettle
CN201117563Y (en) * 2007-08-24 2008-09-17 郑春开 Switch with heat-actuated trip mechanism
CN203503552U (en) * 2013-09-24 2014-03-26 国家电网公司 Electromagnetic electrothermal relay

Patent Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4075594A (en) * 1975-08-15 1978-02-21 Uchiya Co., Ltd. Thermostat with reset arm
CN2051340U (en) * 1989-03-21 1990-01-17 潘力田 Automatic-control electric-heating kettle
CN201117563Y (en) * 2007-08-24 2008-09-17 郑春开 Switch with heat-actuated trip mechanism
CN203503552U (en) * 2013-09-24 2014-03-26 国家电网公司 Electromagnetic electrothermal relay

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN109243127A (en) * 2018-11-15 2019-01-18 中国直升机设计研究所 A kind of reflexive two-way fire detector

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