CN102254747B - Method for ensuring continuous running of equipment under mechanical vibration condition and dedicated relay - Google Patents
Method for ensuring continuous running of equipment under mechanical vibration condition and dedicated relay Download PDFInfo
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- CN102254747B CN102254747B CN201110207355.4A CN201110207355A CN102254747B CN 102254747 B CN102254747 B CN 102254747B CN 201110207355 A CN201110207355 A CN 201110207355A CN 102254747 B CN102254747 B CN 102254747B
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Abstract
The invention relates to a method for ensuring the continuous running of equipment under a mechanical vibration condition and a dedicated relay, belonging to the field of control. The method comprises the following steps of: arranging a rectifier power supply unit, an RC (Resistor-Capacitor) circuit unit, a driving unit and a micro relay between an external electric contact and a start/stop control relay coil in sequence; and outputting a stable electric contact signal by utilizing the charging/time delaying characteristic of the RC circuit, so as to avoid frequent switching-on/switching-off of the start/stop control relay coil, caused by the shaking of the external electric contact, and eliminate the running stop of the equipment, caused by the shaking of the external electric contact due to mechanical vibration. According to the invention, the whole control circuit is stable and reliable to work; the adopted components are standard components and are very convenient to use; and the service life of the external electric contact can be effectively prolonged. The invention can be widely used in the field of electric control systems of various kinds of mechanical equipment.
Description
Technical field
The invention belongs to control field, relate in particular to a kind of for guarantee plant equipment continuously/control method and the control device thereof of stable operation.
Background technology
The motor that has a lot of plant equipment is that it starts/moves by outside electric contact/electrical contact switch control.
The mechanical oscillation that produce while work due to plant equipment, make external electric contact that " shake " occur sometimes, due to the irregular or violent mechanical oscillation of equipment, cause between two contacts of external electric contact, disconnection or disengaging that moment or utmost point short time occur electrically contact, and form instantaneous " opening circuit " or " open circuit " in electric loop.Trace it to its cause, normally because the elastomeric elements such as the spring that keeps external electric contact to contact/connect are along with the growth of service time, elasticity weakens gradually, in the time that its elasticity is not enough to resist certain violent mechanical oscillation in a flash, easily cause instantaneous disconnection or disengaging between two electric contact contacts to electrically contact; Or, severe due to on-the-spot environment for use, make form too much/blocked up oxide of electric contact contact surface, cause the contact/conducting state of electric contact contact unstable, when keeping the spring of its contact because of the irregular or violent mechanical oscillation in the external world, pressure is reduced to moment to a certain degree, has formed the situation of instantaneous " open circuit " or " opening circuit ".
The appearance of above-mentioned situation (being commonly called as in the industry " shake "); can cause quitting work of whole control loop; but because it is to occur moment; be not real disorderly closedown, and there will not be stable malfunction, in the time that maintenance personal checks; conventionally can not find the reason that causes equipment downtime; operating personnel have to restart facility, but is easy to soon and there will be the shutdown of this " agnogenio ", affect very much external electric contact institute control appliance normal/operation continuously.
In addition, also has the design of a lot of plant equipment startup/running control circuits, it is the start-up and operation that external electric contact is carried out to control appliance by general-purpose relay, and " shake " of external electric contact, cause the frequent on/off electricity of coil of general-purpose relay, time one is long, very easily burns the coil of general-purpose relay, causes real equipment fault.
For example, startup/the operation control method of the Roots vacuum system equipment of existing vacuum pump industry is like this: when equipment work, first start fore pump, set vacuum degree by electric contact vacuum meter, reach and set after vacuum degree, startup/the operation of the electric contact control lobe pump open in usual by electric contact vacuum meter, connects an electromagnetic type power-off time relay or transistor type power-off time relay by the electric contact of electric contact vacuum meter, is moved by the startup of this time relay control lobe pump.
While operation due to equipment, inevitably can produce vibration, and then cause " shake " of electric contact, thereby make the frequent on/off electricity of time relay coil, then cause that relay coil burns, affect the normal operation of equipment; While particularly adopting electromagnetic type power-off time relay, " shake " of external electric contact, also can cause that electromagnetic relay ", " makes a sound and affects operating personnel's judgement; And " shake " of external electric contact in the situation that of energising, very easily produce electric spark, the contact contact of the electric contact of singing itself, the useful life of shortening electric contact.
Other industry need to adopt the equipment of above-mentioned control mode perplexed by this type of, and existing this control design is used for a long time, but cannot solve all the time, relay coil burns, device start moves unstable problem.
Summary of the invention
Technical problem to be solved by this invention is to provide a kind of assurance equipment moves continuously in mechanical oscillation situation method and special purpose relay, it utilizes the time-delay characteristics of RC electric line, solve and avoid " shake " of external electric contact and cause equipment problem out of service, both can guarantee equipment continuously, stably operation, can avoid again general-purpose relay coil because of burning that frequent on/off electricity causes, extend the useful life of control apparatus, and simple for structure, be convenient to implement, with low cost, be easy to promote.
Technical scheme of the present invention is: a kind of method that assurance equipment moves continuously in mechanical oscillation situation is provided, comprise the start/stop of controlling motor by the on/off of external electric contact, external electric contact described in it seals in rise/stopping in control relay wire loop of motor running control circuit, utilize the on/off of external electric contact, realize/stop the electric/dead electricity that obtains of control relay coil, and then realize the operation control to motor; It is characterized in that: at described external electric contact with rise/stop setting gradually between control relay coil rectifier power source unit, RC charge/discharge unit, driver element and midget relay, rectifier power source unit, RC charge/discharge unit, driver element and midget relay described in it is arranged in a general-purpose relay housing, is connected with existing motor running control circuit and control power supply by the plug/socket of this housing; By the on/off of described external electric contact, control discharging and recharging of RC charge/discharge unit, utilize the charging/time-delay characteristics of RC circuit, export a stable electric contact signal, avoid, because external electric contact " shake " causes the described frequent on/off electricity that rise/stops control relay coil, eliminating/avoiding external electric contact and cause the operation of equipment to stop because of " shake " that mechanical oscillation produce.
RC charge/discharge unit described in it is RC charge-discharge circuit.
Described driver element is transistor amplifier.
Wherein, RC charge-discharge circuit is connected with rectifier power source unit through external electric contact, the input of transistor amplifier is connected with RC charge-discharge circuit, the output of transistor amplifier is connected with the coil of midget relay, the output contact of midget relay, seals in rise/stopping in control relay wire loop of motor running control circuit.
Further, in the time of described external electric contact closure/connection, rectifier power source unit passes through external electric contact to the electric capacity momentary charge in RC charge/discharge unit, and make the triode conducting in driver element by resistance R, the coil electricity action of midget relay, output contact closure/the connection of midget relay, exports a stable electric contact signal, start/operation of control appliance.
When described external electric contact is in mechanical oscillation in the situation that, while there is a moment disconnection or " shake ", electric capacity in RC charge/discharge unit passes through conductive discharge, make the triode in driver element continue to keep conducting, thereby make midget relay coil keep energising, avoid causing the described frequent on/off electricity that rise/stops control relay coil because of external electric contact " shake ", and then guarantee controlled plant equipment is moved continuously, eliminate/avoid external electric contact and cause the operation of equipment to stop because of " shake " that mechanical oscillation produce.
The present invention also provides a kind of special purpose relay that adopts the above-mentioned method that assurance equipment moves continuously in mechanical oscillation situation, comprise the third and fourth link being originally connected with external electric contact in first, second contact of a general-purpose relay housing, external electric contact and equipment control loop, described special purpose relay is connected with equipment control loop by plug/socket structure, it is characterized in that: in the housing of described general-purpose relay, a rectifier power source unit, charge/discharge unit, driver element and midget relay are set; Described rectifier power source unit is connected with equipment control loop power supply by the plug/socket of special purpose relay; Described charge/discharge unit, through the plug/socket of special purpose relay, is connected with first, second contact of external electric contact; The output contact of described midget relay, through the plug/socket of special purpose relay and the corresponding connection of the third and fourth link being originally connected with external electric contact in equipment control loop.
Wherein, described charge/discharge unit is connected with rectifier power source unit through first, second contact of external electric contact;
Described charge/discharge unit is connected with the coil of midget relay through driver element.
Described rectifier power source unit is conventional transformer step-down/diode rectifier circuit.
Described charge/discharge unit is capacitance-resistance charge-discharge circuit.
Described driver element is transistor amplifier.
Concrete, described conventional transformer step-down/diode rectifier circuit comprises transformer and rectifier bridge, described capacitance-resistance charge-discharge circuit comprises charging capacitor and the first resistance, and described transistor amplifier comprises the first triode, the second triode, the second resistance and diode.
Wherein, the primary coil two ends of described transformer, respectively through the plug/socket connection corresponding to alternating current source of special purpose relay, the secondary coil two ends of described transformer, respectively with the corresponding connection of input of rectifier bridge.
The first contact of external electric contact is held and is connected with "+" of rectification bridge output end, the second contact of external electric contact and one end of charging capacitor are connected, the other end of charging capacitor is connected with " one " end of rectification bridge output end, and charging capacitor is connected with the base stage of the first triode through the first resistance with the link of the second contact.
The emitter of described the first triode is connected with the base stage of the second triode, the collector electrode of described first, second triode and connect after be connected through the coil of midget relay and "+" of rectification bridge output end end, the emitter of described the second triode is connected with the "-" end of rectification bridge output end through the second resistance.
Described diode is attempted by the two ends of midget relay coil.
Often opening or normally closed output contact of described midget relay, through the plug/socket of special purpose relay and the corresponding connection of the third and fourth link being originally connected with external electric contact in equipment control loop.
Compared with the prior art, advantage of the present invention is:
1. adopt after RC charge-discharge circuit, because " shake " of external electric contact just affects discharging and recharging of RC circuit, normal phenomenon to RC element, other elements and control relay are not affected, whole control circuit there is not the frequent power on/off of general-purpose relay coil, so can be stablized, work reliably yet;
2. above-mentioned special purpose relay adopts the shell mechanism of Universal time relay JS14, employing standard 8 hole relay plugs, socket, and the parts that adopt are all standarized components; Available screw is installed or 35MM guide rails assembling, very easy to use;
3. adopt after above-mentioned special purpose relay, avoided because when mechanical oscillation and " shake ", " sparking ", " singing " phenomenon of between the contact of external electric contact, occurring, can effectively extend useful life of external electric contact.
Accompanying drawing explanation
Fig. 1 is method block diagram of the present invention;
Fig. 2 is that the circuit module of technical solution of the present invention forms schematic diagram;
Fig. 3 is the electronic circuit embodiment schematic diagram of the technical program;
Fig. 4 is the structural representation of this special purpose relay;
Fig. 5 is the installation wiring schematic diagram of this special purpose relay.
In figure, 1 is Universal time relay shell, and 2 is wiring board, and 3 is relay socket.
Embodiment
Below in conjunction with drawings and Examples, the present invention will be further described.
In Fig. 1, existing electromotor control circuit comprises the start/stop of controlling motor by the on/off of external electric contact, external electric contact described in it seals in rise/stopping in control relay wire loop of motor running control circuit, utilize the on/off of external electric contact, realize/stop the electric/dead electricity that obtains of control relay coil, and then realize the operation control to motor.
The technical program is at external electric contact and rise/stop setting gradually between control relay coil rectifier power source unit, RC charge/discharge unit, driver element and midget relay, rectifier power source unit, RC charge/discharge unit, driver element and midget relay described in it is arranged in a general-purpose relay housing, is connected with existing motor running control circuit and control power supply by the plug/socket of this housing; By the on/off of described external electric contact, control discharging and recharging of RC charge/discharge unit, utilize the charging/time-delay characteristics of RC circuit, export a stable electric contact signal, avoid, because external electric contact " shake " causes the described frequent on/off electricity that rise/stops control relay coil, eliminating/avoiding external electric contact and cause the operation of equipment to stop because of " shake " that mechanical oscillation produce.
Concrete, the RC charge/discharge unit described in it is RC charge-discharge circuit.Driver element described in it is transistor amplifier.
Wherein, RC charge-discharge circuit is connected with rectifier power source unit through external electric contact, the input of transistor amplifier is connected with RC charge-discharge circuit, the output of transistor amplifier is connected with the coil of midget relay, the output contact of midget relay, seals in rise/stopping in control relay wire loop of motor running control circuit.
Specifically as shown in the figure, in the time of described external electric contact closure/connection, rectifier power source unit passes through external electric contact to the electric capacity momentary charge in RC charge/discharge unit, and make the triode conducting in driver element by resistance R, the coil electricity action of midget relay, output contact closure/the connection of midget relay, exports a stable electric contact signal, start/operation of control appliance.
When described external electric contact is in mechanical oscillation in the situation that, while there is a moment disconnection or " shake ", electric capacity in RC charge/discharge unit passes through conductive discharge, make the triode in driver element continue to keep conducting, thereby make midget relay coil keep energising, avoid causing the described frequent on/off electricity that rise/stops control relay coil because of external electric contact " shake ", and then guarantee controlled plant equipment is moved continuously, eliminate/avoid external electric contact and cause the operation of equipment to stop because of " shake " that mechanical oscillation produce.
Because RC charge/discharge unit, driver element and midget relay are prior art, its specific works principle, process and annexation are no longer narrated at this.
In Fig. 2, in prior art, first, second contact A of original external electric contact, B, be to be connected respectively with the third and fourth link C, the D that are originally connected with external electric contact in equipment control loop.
In the technical program, be provided with the plug/socket of a Universal time relay in original control loop, the plug/socket of this Universal time relay, the the first/the second contact A/B with original external electric contact, the three/four link C/D in equipment control loop, and alternating current source U1/U2 is connected respectively.
In the housing of described Universal time relay, a rectifier power source unit, charge/discharge unit, driver element and midget relay are set.
Its rectifier power source unit is connected respectively by plug/socket and the alternating current source U1/U2 of special purpose relay, its charge/discharge unit is connected through the plug/socket of special purpose relay and first, second contact A, the B of external electric contact, the output contact of its midget relay, through the plug/socket of special purpose relay and the corresponding connection of the third and fourth link C, D being originally connected with external electric contact in equipment control loop.
In circuit structure, charge/discharge unit is connected with rectifier power source unit through first, second contact of external electric contact C, D, charge/discharge unit is connected with the coil of midget relay through driver element, the output contact of midget relay and the corresponding connection of the third and fourth link C, D being originally connected with external electric contact in equipment control loop.
In Fig. 3, rectifier power source unit is conventional transformer step-down/diode rectifier circuit, charge/discharge unit is capacitance-resistance charge-discharge circuit, driver element is compound transistor amplifying circuit, often opening or normally closed output contact of midget relay, through the plug/socket of relay and the corresponding connection of the third and fourth link C, D being originally connected with external electric contact in equipment control loop.
Concrete, conventional transformer step-down/diode rectifier circuit comprises transformer B and rectifier bridge Q, capacitance-resistance charge-discharge circuit comprises charging capacitor C and the first resistance R, and described transistor amplifier comprises the first triode BG1, the second triode BG2, the second resistance R 0 and diode D.
Wherein, the primary coil two ends of transformer, respectively through the plug/socket connection corresponding to alternating current source of special purpose relay, the secondary coil two ends of transformer, respectively with the corresponding connection of input of rectifier bridge.
The first contact A of external electric contact is held and is connected with "+" of rectification bridge output end, the second contact B of external electric contact is connected with one end of charging capacitor C, the other end of charging capacitor C is connected with " one " end of rectification bridge output end, and charging capacitor is connected with the base stage of the first triode BG1 through the first resistance R with the link of the second contact B of external electric contact.
The emitter of described the first triode BG1 is connected with the base stage of the second triode BG2, the collector electrode of described first, second triode and connect after be connected through the coil J of midget relay and "+" of rectification bridge output end end, the emitter of described the second triode is connected with the "-" end of rectification bridge output end through the second resistance R 0.
Described diode D is attempted by the two ends of midget relay coil J.
Because mechanical oscillation make the time of external electric contact moment disconnection very short, so select the parameter of RC, make the discharge time of capacitor C in 2S left and right.
In Fig. 4, the technical program is in Universal time relay shell 1, a wiring board 2 is set, carry in the circuit board aforesaid rectifier power source unit, charge/discharge unit, driver element and midget relay, foregoing circuit is connected with existing electromotor control circuit accordingly through relay socket 3.
Above-mentioned Universal time relay shell adopts the shell of Universal time relay JS14, and relay socket adopts standard 8 hole relay sockets.
Fig. 5 has provided the outside of this special purpose relay wiring schematic diagram (or claiming socket that winding diagram is installed) has been installed, and terminals 1,2 are connected with alternating current 220V power end, and terminals 3,4 are connected with outside electric contact, and terminals 6 and 7 and 6 and 5 form two pairs of output contacts.
Because above-mentioned Fig. 5 adopts GB drafting standard, those skilled in the art all can understand its method for expressing and implication, therefore no longer describe in detail at this.
The course of work of Roots vacuum system is:
After fore pump starts, give special purpose relay of the present invention for AC220V power supply ( connecing 1,2 terminals), after vacuum degree arrives, external electric contact signal input ( connecing 3,4 terminals), the startup operation of exporting a stable contact point signal (5,6 or 6,7 terminal) control lobe pump.
Even external electric contact signal vibration, the contact point signal of output is also stable; And the power supply of special purpose relay of the present invention is stable connection, there is not the frequent power on/off of coil, the vibration of external electric contact is discharging and recharging the inner RC element of this special purpose relay just, normal work to RC element, other elements are not had to damageability impact yet, so can reliable and stable work yet.
According to the electronic-circuit diagram of above-mentioned special purpose relay, when external electric contact vibrates because of mechanical oscillation, because the electric current of the electronic circuit of external electric contact place part only has tens milliamperes, can there is not the phenomenon of singing of striking sparks in external electric contact, can effectively extend the useful life of external electric contact.
Due to the enforcement of the technical program, the harm that can avoid " shake " of external electric contact to bring, so whole control circuit can be stablized, work reliably, plant equipment also can realize safety, stable operation, and improves simple for structurely, is convenient to implement, with low cost, be easy to promote.
The technical program has successfully been applied in the control system of Roots vacuum system of vacuum pump industry, has obtained satisfied result of use.
The output of the Roots vacuum system of vacuum industry has nearly ten thousand covers now, also has old scrap build, adds the similar control system of other industry, will have a tremendous social and economic benefits.
The present invention can be widely used in the electric control system field of various plant equipment.
Claims (5)
1. the assurance equipment method of operation continuously in mechanical oscillation situation, comprise the start/stop of controlling motor by the on/off of external electric contact, external electric contact described in it seals in rise/stopping in control relay wire loop of motor running control circuit, utilize the on/off of external electric contact, realize/stop the electric/dead electricity that obtains of control relay coil, and then realize the operation control to motor; It is characterized in that:
At described external electric contact with rise/stop setting gradually between control relay coil rectifier power source unit, RC charge/discharge unit, driver element and midget relay, rectifier power source unit, RC charge/discharge unit, driver element and midget relay described in it is arranged in a general-purpose relay housing, is connected with existing motor running control circuit and control power supply by the plug/socket of this housing; By the on/off of described external electric contact, control discharging and recharging of RC charge/discharge unit, utilize the charging/time-delay characteristics of RC circuit, export a stable electric contact signal, avoid, because external electric contact " shake " causes the described frequent on/off electricity that rise/stops control relay coil, eliminating/avoiding external electric contact and cause the operation of equipment to stop because of " shake " that mechanical oscillation produce;
RC charge/discharge unit described in it is RC charge-discharge circuit; Described driver element is transistor amplifier;
Wherein, RC charge-discharge circuit is connected with rectifier power source unit through external electric contact, the input of transistor amplifier is connected with RC charge-discharge circuit, the output of transistor amplifier is connected with the coil of midget relay, the output contact of midget relay, seals in rise/stopping in control relay wire loop of motor running control circuit.
2. according to the method that assurance equipment moves continuously in mechanical oscillation situation claimed in claim 1, it is characterized in that in the time of described external electric contact closure/connection, rectifier power source unit passes through external electric contact to the electric capacity momentary charge in RC charge/discharge unit, and make the triode conducting in driver element by resistance R, the coil electricity action of midget relay, output contact closure/the connection of midget relay, exports a stable electric contact signal, start/operation of control appliance;
When described external electric contact is in mechanical oscillation in the situation that, while there is a moment disconnection or " shake ", electric capacity in RC charge/discharge unit passes through conductive discharge, make the triode in driver element continue to keep conducting, thereby make midget relay coil keep energising, avoid causing the described frequent on/off electricity that rise/stops control relay coil because of external electric contact " shake ", and then guarantee controlled plant equipment is moved continuously, eliminate/avoid external electric contact and cause the operation of equipment to stop because of " shake " that mechanical oscillation produce.
3. realize the special purpose relay of the method that assurance equipment moves continuously in mechanical oscillation situation claimed in claim 1 for one kind, comprise the third and fourth link being originally connected with external electric contact in first, second contact of a general-purpose relay housing, external electric contact and equipment control loop, described special purpose relay is connected with equipment control loop by plug/socket structure, it is characterized in that:
In the housing of described general-purpose relay, a rectifier power source unit, charge/discharge unit, driver element and midget relay are set;
Described rectifier power source unit is connected with equipment control loop power supply by the plug/socket of special purpose relay;
Described charge/discharge unit, through the plug/socket of special purpose relay, is connected with first, second contact of external electric contact;
The output contact of described midget relay, through the plug/socket of special purpose relay and the corresponding connection of the third and fourth link being originally connected with external electric contact in equipment control loop;
Wherein, described charge/discharge unit is connected with rectifier power source unit through first, second contact of external electric contact;
Described charge/discharge unit is connected with the coil of midget relay through driver element.
4. according to the special purpose relay of the method that assurance equipment moves continuously in mechanical oscillation situation claimed in claim 3, it is characterized in that described rectifier power source unit is conventional transformer step-down/diode rectifier circuit; Described charge/discharge unit is capacitance-resistance charge-discharge circuit; Described driver element is transistor amplifier; Described conventional transformer step-down/diode rectifier circuit comprises transformer and rectifier bridge, described capacitance-resistance charge-discharge circuit comprises charging capacitor and the first resistance, and described transistor amplifier comprises the first triode, the second triode, the second resistance and diode;
Wherein, the primary coil two ends of described transformer, respectively through the plug/socket connection corresponding to alternating current source of special purpose relay, the secondary coil two ends of described transformer, respectively with the corresponding connection of input of rectifier bridge;
The first contact of external electric contact is held and is connected with "+" of rectification bridge output end, the second contact of external electric contact and one end of charging capacitor are connected, the other end of charging capacitor is connected with " one " end of rectification bridge output end, and charging capacitor is connected with the base stage of the first triode through the first resistance with the link of the second contact;
The emitter of described the first triode is connected with the base stage of the second triode, the collector electrode of described first, second triode and connect after be connected through the coil of midget relay and "+" of rectification bridge output end end, the emitter of described the second triode is connected with the "-" end of rectification bridge output end through the second resistance;
Described diode is attempted by the two ends of midget relay coil.
5. according to the special purpose relay of the method that assurance equipment moves continuously in mechanical oscillation situation claimed in claim 3, it is characterized in that often opening or normally closed output contact of described midget relay, through the plug/socket of special purpose relay and the corresponding connection of the third and fourth link being originally connected with external electric contact in equipment control loop.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201110207355.4A CN102254747B (en) | 2011-07-22 | 2011-07-22 | Method for ensuring continuous running of equipment under mechanical vibration condition and dedicated relay |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201110207355.4A CN102254747B (en) | 2011-07-22 | 2011-07-22 | Method for ensuring continuous running of equipment under mechanical vibration condition and dedicated relay |
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| CN102254747A CN102254747A (en) | 2011-11-23 |
| CN102254747B true CN102254747B (en) | 2014-05-28 |
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| CN201110207355.4A Expired - Fee Related CN102254747B (en) | 2011-07-22 | 2011-07-22 | Method for ensuring continuous running of equipment under mechanical vibration condition and dedicated relay |
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Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN2043421U (en) * | 1988-05-28 | 1989-08-23 | 邓江工 | Automatic time-delay switch device |
| CN1049934A (en) * | 1989-08-31 | 1991-03-13 | 重庆电子设备厂 | The delay cut-off relay of preventing switch from fluttering |
| CN101582584A (en) * | 2009-06-24 | 2009-11-18 | 蔡甫寒 | New method preventing AC contactor from being on or off frequently |
| CN201655679U (en) * | 2010-04-15 | 2010-11-24 | 李天平 | Low-voltage contactor delay circuit device |
-
2011
- 2011-07-22 CN CN201110207355.4A patent/CN102254747B/en not_active Expired - Fee Related
Patent Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN2043421U (en) * | 1988-05-28 | 1989-08-23 | 邓江工 | Automatic time-delay switch device |
| CN1049934A (en) * | 1989-08-31 | 1991-03-13 | 重庆电子设备厂 | The delay cut-off relay of preventing switch from fluttering |
| CN101582584A (en) * | 2009-06-24 | 2009-11-18 | 蔡甫寒 | New method preventing AC contactor from being on or off frequently |
| CN201655679U (en) * | 2010-04-15 | 2010-11-24 | 李天平 | Low-voltage contactor delay circuit device |
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| CN102254747A (en) | 2011-11-23 |
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