CN100505465C - Overcurrent protector - Google Patents
Overcurrent protector Download PDFInfo
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- CN100505465C CN100505465C CNB200510071124XA CN200510071124A CN100505465C CN 100505465 C CN100505465 C CN 100505465C CN B200510071124X A CNB200510071124X A CN B200510071124XA CN 200510071124 A CN200510071124 A CN 200510071124A CN 100505465 C CN100505465 C CN 100505465C
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- overcurrent protective
- temperature
- protective device
- contactor
- escape
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Abstract
The invention relates to a heat-sensitive over-current protector for motor starter. The protector includes: case (39), plural sensing devices (8, 9, 10) for sensing instantaneous heat state of mechanism members in the case (39), plural indicators (11, 12, 13, 14, 18, 19) which are operate-connected with status sensing device for indicating switch status of mechanism members, and devices (21, 31) for starting contactor (33, 34, 35) and providing determined displacement between the two devices, and device (16) connected to the plural switch status indicators and used for manual testing, and selector (1) used for replacement for the mechanism member, and dimension reduced built-in starting contactor (3) (45mm in general).
Description
Invention field
The present invention relates to a kind of temperature-sensitive overcurrent protective device that is used for motor starter.Specifically, the present invention relates to a kind of temperature-sensitive overcurrent protective device, this temperature-sensitive overcurrent protective device is used for the overcurrent protection of the motor starter of polyphase machine.More specifically; the present invention relates to a kind of temperature-sensitive overcurrent protective device; this temperature-sensitive overcurrent protective device is provided with multiple button; the quick escape mechanism and the contactor system that have the overcurrent protection that is applicable to the polyphase machine starter comprise being used for providing the built-in starting contactor that starts function to described motor starter.
Background technology
The temperature-sensitive overcurrent protective device generally is used to prevent multiple current flow through motor or equipment.The escape of overcurrent protective device and alarm contactor generally have the width of 45mm.Motor starter comprises a contactor as switching mechanism, and generally includes an overcurrent protective device.Described overcurrent protective device is connected with the coil of described contactor.Under overload situations, described overcurrent protective device escape, and disconnect described contactor or described motor starter, thus the discontinuous electric current of starting drive is provided by the power supply passage of described motor.In order to restart motor starter, use the separate type module in the current technology, the protection mechanism of described separate type module and overcurrent protective device is electrically connected.
The temperature-sensitive overcurrent protective device can be divided into two parts, main circuit and auxiliary circuits on electric.The full-load current of described motor flows through described main circuit, and starts switching mechanism, and therefore relevant auxiliary circuit just is in the state of overload.Described auxiliary circuit both can be used in the purpose of signalling, perhaps formed the part of control circuit.
Usually, overcurrent protective device only has one " alarm " and " escape " contactor.Four terminals are arranged on auxiliary circuit, and " alarm " and " escape " contactor respectively uses pair of terminals.
The overcurrent protective device of 45mm width has " alarm " and " escape " contactor, but five auxiliary connection ends are arranged.Such structure is normally used for mini contactor, and wherein, winding wiring is in identical level and/or height with the main power source terminals.In such structure, the 5th terminals are used to provide and being connected of described contactor coil.
Overcurrent protective device has " alarm ", and " escape " and " startup " contactor has five terminals.The width of such overcurrent protective device can not match with the contactor of 45mm width greater than 45mm.For all control device products in first framework, 45mm is a standard size.
Because the overcurrent protective device of 45mm width is not activated contactor, just needs extra " often opening (NO) " contact block, it is used on the motor starter.This " NO " contact block is used for " startup " contactor.
United States Patent (USP) 4859979 and indian patent 172722 about overcurrent protective device well known in the prior art comprises; first chamber of shell; bimetal leaf; pass the electric current that described bimetal leaf flows through polyphase network; by an electromagnetic contactor feeds load; and in second chamber, an electromagnetism subassembly comprises cut-out and signal-emitting switch, and described switch has movably contact and start-up point.Described second chamber also is included in the switching transmission device between described bimetal leaf and described public, also comprises the device of the operator scheme that is used for selector switch.
The shortcoming of described existing overcurrent protective device is:
Major defect is that the starting contactor that is used for motor starter is a separate type module, and it makes the volume of described device become very big.
Another shortcoming is because the wide overcurrent protective device of 45mm is not activated contactor, and the additional contact block of often opening must be housed in motor starter, and this has just strengthened and has taken up space and expense.
Another shortcoming is, under automatic operation mode, indication is not visible fully usually, and this has just caused instantaneous state indeterminate of each mechanism components of described device.
Therefore; a kind of temperature-sensitive overcurrent protective device just need be provided; described device is provided with multiple button; the quick escape mechanism and the contactor system that have the overcurrent protection that is applicable to the polyphase machine starter; comprise a built-in starting contactor; be applicable to and restart motor, and the convenience and the compact temperature-sensitive function of described device are provided.
Goal of the invention
Therefore, basic purpose of the present invention is to provide a kind of built-in " startup " contactor that is used for the overcurrent protective device (general width is 45mm) that size reduces.
Another object of the present invention is to provide a kind of temperature-sensitive overcurrent protective device of being convenient to operate with compact.
Use separate type module reduces production costs a further object of the present invention in motor starter by avoiding, thereby reduces terminal use's expense.
A further object of the present invention is only to pass through parts, and with different functions, as quick escape (together with other mechanical parts), manually escape (test function) and deixis integrated (operating/provide) are together.
A further object of the present invention is by coloured labeling is provided on above-mentioned parts, thereby the state of each mechanism of overcurrent protective device is provided a visual clearly indication.
A further object of the present invention is button and a switching that produces along with quick escape of having two diverse locations by one, thus provide reset automatically-manual mode.
A further object of the present invention is to provide a contactor system, and the feasible contactor gap that is obtained is greater than the stroke of slider.
Summary of the invention
Therefore, according to basic sides of the present invention, provide a kind of temperature-sensitive overcurrent protective device that is used for motor starter, described device comprises:
(i) shell;
(ii) be used to respond to a plurality of induction installations of the transient thermal behavior of the mechanism components in the described shell;
(iii) a plurality of indicating devices that are operatively connected with described induction installation, described indicating device is used to indicate the on off state of described mechanism components;
The (iv) starting drive of contactor is used for starting contactor and is used to provide the displacement of determining between described two devices;
(v) the manual test device that is operatively connected with described a plurality of indicating devices is used for the manual test function;
(vi) be used for mechanism components is carried out the selector installation of reset operation; With
(vii) described starting drive is built in the described temperature-sensitive overcurrent protective device of 45mm width.
Brief description of drawings
Other advantages of the present invention and feature will clearly be illustrated by following description to one embodiment of the present of invention represented in the accompanying drawing.
Fig. 1 shows the schematic top plan view of temperature-sensitive overcurrent protective device of the present invention.
Fig. 2 shows the rearview of temperature-sensitive overcurrent protective device of the present invention.
Fig. 3 shows the rearview of the shell of temperature-sensitive overcurrent protective device of the present invention.
Fig. 4 shows the vertical view of the shell of temperature-sensitive overcurrent protective device of the present invention.
Fig. 5 shows the front view of the shell of temperature-sensitive overcurrent protective device of the present invention.
Fig. 6 shows the upward view of the shell of temperature-sensitive overcurrent protective device of the present invention.
The detailed description of accompanying drawing
In Fig. 1, show the schematic top plan view of temperature-sensitive overcurrent protective device of the present invention.In the drawings, shell 39 comprises automatic/hand mode selector 1, and electric current is provided with knob 2, start button 3, " reset to add and stop " or " only for resetting " button 4 and alarm and escape contactor 5, manually escape device 6 and visualizer 7.
In Fig. 2, show the rearview of temperature-sensitive overcurrent protective device of the present invention.Automatic/hand mode selector 1 has two different positions, each other in the right angle, thereby can switch to another kind of state from a kind of state.Electric current is provided with knob 2 and is applicable to overcurrent protection mechanism electric current is set.When pressing start button 3, motor is activated.Reset/stop button 4 be applicable to according to the operation needs be set at reset mode or stop mode.When circuit overloads, main bimetallic devices 8,9,10 are deflected.Starter 14 passes to the deflection of main bimetallic devices 8,9,10 by differential lever 11,12 and mobile jib 13 switching mechanism of overcurrent protection.Starter 14 promotes escape levers 18, described escape lever 18 by an extension spring 22 with escape indicating device 19 mechanical couplings.Escape indicating device 19 also with slider 21 mechanical couplings.In pivot 15, the other end of compensation bimetallic devices is connected with the cam 20 that electric current is provided with knob by a screw 17 that is called as calibration screw compensation bimetallic devices 16 by rivet clasp.
In Fig. 3, show the rearview of the shell of temperature-sensitive overcurrent protective device of the present invention.From figure, as can be seen, escape lever 18 and escape indicating device 19 are articulated in shell 39.Provide balance pivot 24 starter 14 (as shown in Figure 2) is crossed it and move.Provide another balance pivot 25 and knob 2 (as shown in Figure 2) is set with migration current.Reset/stop button 3 (as shown in Figure 2) comprises spring 26.Button profile 27 is suitable for promoting along opposite direction the projection 28 of slider 21 (as shown in Figure 2), thereby whole overcurrent protective device is resetted.
In Fig. 4, show the vertical view of the shell of temperature-sensitive overcurrent protective device of the present invention.Have torsionspring 29 in the overcurrent protective device, be applicable to the switching of automatic/hand mode selector button 1 (as shown in Figure 2).On the visualizer 7 (as shown in fig. 1) of manual escape device 6, has projection 30.The arm 31 of slider starts conduction cantilever 33,34 and 35 (as shown in Figure 5).The projection 32 of automatic/hand mode selector button 1 (as shown in Figure 2) is in automatic mode, the action of restriction escape indicating device 19 (as shown in Figure 2).
In Fig. 5, show the front view of temperature-sensitive overcurrent protective device of the present invention.Long-armed 31 (also shown in Figure 6) of slider 21 (as shown in Figure 2) start normally closed movable contactor 33,34.Contactor 33,34 and 35 is the conduction cantilevers that are fixed in terminals 36.Reset/projection 37 of stop button 3 (as shown in Figure 2) touches the top 38 of normally closed movable contactor 33 and makes its displacement, thereby open normally closed contactor 33.
Detailed description of the present invention
In the present invention, overcurrent protective device comprises three contactors, that is, and and " alarm ", " escape " and " startup ".This device comprises two resting positions, that is, and and " resetting " and " escape " position.This device comprises a plurality of induction installations that are operatively connected with starter, and described induction installation is applicable to the transient thermal behavior of this device of induction, and correspondingly in the switching mechanism of overcurrent protective device each parts is positioned.Described a plurality of induction installation comprises three main bimetallic devices, and under overcurrent situations, described bimetallic devices can the deflection owing to the rising of temperature.The starter that is operatively connected with described main bimetallic devices is suitable for by a plurality of leverages the deflection of bimetallic devices being delivered to the switching mechanism of overcurrent protective device.Described a plurality of leverage comprises differential lever and mobile jib.This starter is suitable for promoting the leverage with the indicating device mechanical couplings, and described indicating device is suitable for indicating the former or present state of overcurrent protective device.Described leverage also comprises the escape lever with the indicating device mechanical couplings, and described indicating device comprises the escape indicating device that is connected by spring assembly.Described spring assembly comprises extension spring, when the escape lever from its first resting position, promptly reset position moves to second resting position, promptly during the escape position, the extension spring elongation.Described escape indicating device also with the slider mechanical couplings, thereby moves between two resting positions.The labeling that the shape of escape indicating device makes indicating device connect same colour can provide clearly visual indication to the instantaneous state of each mechanism components of overcurrent protective device.Described escape indicating device comprises the projection that is applicable to manual escape operation.
Overcurrent protective device of the present invention comprises the starting drive of contactor arrangement, thereby carries out or cut off " escape contact " and " alarm contacts " according to its position.Described starting drive comprises and has the slider that long-armed being used to makes Contactor Starting, comprises the conduction cantilever that is fixed in terminals.Pushbutton unit comprises the contactor button of the other end that is fixed in the conduction cantilever.The arm of slider be suitable between stiff end and the contactor button a bit on start the conduction cantilever, so that the contactor gap greater than the slider stroke to be provided.
Overcurrent protective device of the present invention comprises that electric current is provided with knob, is used for setting electric current according to motor speed.Electric current is provided with knob increases or reduces distance between the bimetallic devices that starter and electric current be provided with knob according to its setting.
Described bimetallic devices comprises the compensation bimetallic devices, and one end rivet clasp is in pivot device, and its other end is by a screw device that has comprised calibration screw and be connected with cam that electric current is provided with knob.Described compensation bimetallic devices can be moved it at the balance pivot place by pivot joint, and described balance pivot is provided by pivot.Described compensation bimetallic devices is suitable for changing the distance between starter and the mobile jib, to keep the identical escape time.The described compensation bimetallic devices that is connected on the cam that electric current is provided with knob is suitable for ambient temperature according to this mechanism components and changes distance between cam and the mobile jib, thereby keeps the predetermined distance between starter and the mobile jib constant.
This device comprises and resetting and stop button that described button is equipped with spring, makes can return its initial position when button is released, and is suitable for this device being resetted and stopping.When overcurrent protective device is in the escape condition, to be pressed when reset button, it promotes slider in opposite direction, thereby whole device is resetted.When this installed not escape, when pressing button, the projection on this button touched the top of normally closed movable contactor, and promotes this movable contactor, thereby opens this normally closed contactor.This normally closed contactor is configured to connect with contactor coil.By opening this normally closed contactor, contactor coil is de-energized, and falls, thereby motor is stopped.
This device comprises selector installation, and described selector installation comprises the automatic-manual mode selector that is used for the automatic or manual reset mode.Should comprise two rectangular each other diverse locations, can switch to another state from a state, and switch by automatic-manual mode selector button with quick escape.Described button comprises the projection of the action that is used under automatic mode restriction escape indicating device, thereby prevents that extension spring from crossing its stop.Therefore, close after (OFF) when contactor is switched to, whole device automatically resets, and main bimetallic devices cooling and return its original position.When automatically-when the manual mode selector was not operated, it did not interfere the motion of escape indicating device, and reset and must manually carry out.Start button comprises projection, makes that the described projection on the starting contactor is suitable for keeping the top of starting contactor and makes the contactor escape, thereby makes starting contactor open motor starter when button is pressed.
Claims (11)
1. temperature-sensitive overcurrent protective device that is used for motor starter, described device comprises:
(i) shell;
(ii) be used to respond to a plurality of induction installations of the transient thermal behavior of the mechanism components in the described shell;
(iii) a plurality of indicating devices that are operatively connected with described induction installation, described indicating device is used to indicate the on off state of described mechanism components;
The (iv) starting drive of contactor, be used for starting contactor and be used to provide described induction installation and described indicating device between the displacement of determining;
(v) the manual test device that is operatively connected with described a plurality of indicating devices is used for the manual test function;
(vi) be used for mechanism components is carried out the selector installation of reset operation; With
(vii) described starting drive places in the described temperature-sensitive overcurrent protective device of 45mm width.
2. temperature-sensitive overcurrent protective device according to claim 1 is characterized in that, the described a plurality of induction installations that are used to respond to transient thermal behavior comprise main bimetallic devices.
3. temperature-sensitive overcurrent protective device according to claim 2 is characterized in that, the described on off state that is used to indicate the mechanism components of described temperature-sensitive overcurrent protective device, and comprise with a plurality of indicating devices that described main bimetallic devices is operatively connected:
(i) the described starting drive that is operatively connected with described main bimetallic devices;
(ii) a plurality of leverages that are connected with described starting drive; With
What (iii) be used for the escape indication can know visual escape indicating device; described escape indicating device is so shaped that the described escape indicating device that includes the colour code subsides provides clearly indication for described temperature-sensitive overcurrent protective device, and as the common component that is used for manual escape.
4. temperature-sensitive overcurrent protective device according to claim 3 is characterized in that, described starting drive is used for by a plurality of leverages that are connected with described starting drive the deflection of main bimetallic devices being delivered to switching mechanism.
5. according to claim 3 or 4 described temperature-sensitive overcurrent protective devices; it is characterized in that; described a plurality of leverage comprises the escape lever; described escape lever comprises extension spring; described extension spring be used for when described escape lever when its first resting position moves to second resting position, described escape lever is stretched.
6. temperature-sensitive overcurrent protective device according to claim 1 is characterized in that, the starting drive of described contactor comprises and has long-armed slider, the described long-armed contactor gap that is used to provide greater than the stroke of described slider.
7. temperature-sensitive overcurrent protective device according to claim 6 is characterized in that, described contactor comprises the conduction cantilever between the button of the stiff end of described slider and described contactor.
8. temperature-sensitive overcurrent protective device according to claim 1; it is characterized in that; the device that is operatively connected with pivot device comprises the compensation bimetallic devices; described compensation bimetallic devices is used to change the distance between described starting drive and the mobile jib, with the identical escape time of the mechanism components that keeps described temperature-sensitive overcurrent protective device.
9. temperature-sensitive overcurrent protective device according to claim 8; it is characterized in that; described compensation bimetallic devices is connected on the cam that electric current is provided with knob; described compensation bimetallic devices is used for ambient temperature according to mechanism components and changes distance between described cam and the described mobile jib, thereby keeps the predetermined distance between described starting drive and the described mobile jib.
10. temperature-sensitive overcurrent protective device according to claim 1; it is characterized in that; described selector installation comprises automatically-the manual mode selector button that described button comprises rectangular each other two different positions, is used for the handover operation from a kind of state to another kind of state.
11. temperature-sensitive overcurrent protective device according to claim 1; it is characterized in that; the starting drive of described contactor comprises projection; described projection is used to keep the top of the starting drive of described contactor; and make the starting drive escape of described contactor, make described contactor starting drive thereby open motor starter.
Applications Claiming Priority (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| IN574MU2004 | 2004-05-20 | ||
| IN574/MUM/2004 | 2004-05-20 |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN1700551A CN1700551A (en) | 2005-11-23 |
| CN100505465C true CN100505465C (en) | 2009-06-24 |
Family
ID=35476467
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CNB200510071124XA Expired - Fee Related CN100505465C (en) | 2004-05-20 | 2005-05-20 | Overcurrent protector |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN100505465C (en) |
Citations (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US4859979A (en) * | 1987-07-08 | 1989-08-22 | La Telemecanique Electrique | Thermal relay |
-
2005
- 2005-05-20 CN CNB200510071124XA patent/CN100505465C/en not_active Expired - Fee Related
Patent Citations (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US4859979A (en) * | 1987-07-08 | 1989-08-22 | La Telemecanique Electrique | Thermal relay |
Also Published As
| Publication number | Publication date |
|---|---|
| CN1700551A (en) | 2005-11-23 |
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|---|---|---|---|
| C06 | Publication | ||
| PB01 | Publication | ||
| C10 | Entry into substantive examination | ||
| SE01 | Entry into force of request for substantive examination | ||
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
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| CF01 | Termination of patent right due to non-payment of annual fee |
Granted publication date: 20090624 Termination date: 20140520 |