CN205173652U - Protection control circuit is stopped to automatic opening of cooling tower solenoid valve - Google Patents
Protection control circuit is stopped to automatic opening of cooling tower solenoid valve Download PDFInfo
- Publication number
- CN205173652U CN205173652U CN201520927117.4U CN201520927117U CN205173652U CN 205173652 U CN205173652 U CN 205173652U CN 201520927117 U CN201520927117 U CN 201520927117U CN 205173652 U CN205173652 U CN 205173652U
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- Prior art keywords
- relay
- contact
- solenoid valve
- resistance
- coil
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Abstract
The utility model discloses a protection control circuit is stopped to automatic opening of cooling tower solenoid valve, including PLC controller, resistance R1, electric capacity C1, relay J0, key switch K1 and emitting diode LED, PLC controller pin L+ connects relay J1 contact J1 -1 and key switch K1 respectively, relay J0 contact J0 -1 is connected to the key switch K1 other end, the relay J0 contact J0 -1 other end is connecting resistance R4 respectively, solenoid valve DF, diode D2 negative pole and relay J2 contact J2 -3, the solenoid valve DF other end is connected respectively to diode D2 positive pole, relay J2 contact J2 -2 and relay J2 contact J2 -1, the relay J2 contact J2 -1 other end passes through relay J1 contact J1 -2 connecting resistance R2. The utility model discloses protection control circuit is stopped to automatic opening of cooling tower solenoid valve, it is out of control to prevent effectively that relay contact points adhesion or relay coil short circuit and solenoid valve coil short circuit from causing, and line structure is simple, and is with low costs, small, and application scope is wide.
Description
Technical field
The utility model relates to a kind of solenoid valve control circuit, specifically a kind of cooling tower solenoid valve automatic start-stop protecting control circuit.
Background technique
Cooling tower is arranged on the place of roof or outdoor often, after usual start, operator just seldom goes the operation of concern equipment, even so chilled water is after the temperature reaching setting, what cooling tower also can be appointed do not stop transport turns, waste that is electric and water will be caused like this, existing a lot of technology all can control the automatic start-stop of cooling tower, by temp controller, automatic start-stop is carried out to cooling tower, in order to avoid cause the increase of cost of production, but it is very coarse that existing controller all does in protective circuit, mostly all only with over-current over-voltage protection, and controller is all adopt relay as control unit, and easily there is " adhesion " fault in relay, very large harm is produced to controller.
Model utility content
The purpose of this utility model is to provide a kind of cooling tower solenoid valve automatic start-stop protecting control circuit, to solve the problem proposed in above-mentioned background technology.
For achieving the above object, the utility model provides following technological scheme:
A kind of cooling tower solenoid valve automatic start-stop protecting control circuit, comprises PLC, resistance R1, electric capacity C1, relay J 0, key switch K1 and LED, described PLC pin L+ connects relay J 1 contact J1-1 and key switch K1 respectively, and the key switch K1 the other end connects relay J 0 contact J0-1, and the relay J 0 contact J0-1 the other end is contact resistance R4 respectively, solenoid valve DF, diode D2 negative pole and relay J 2 contact J2-3, diode D2 positive pole be the connected electromagnetic valve DF the other end respectively, relay J 2 contact J2-2 and relay J 2 contact J2-1, the relay J 2 contact J2-1 the other end is by relay J 1 contact J1-2 contact resistance R2, and the resistance R2 the other end connects relay J 1 contact J1-3 respectively, resistance R1, electric capacity C2, relay J 0 coil, bulb Z1, bulb Z2, relay J 2 coil and PLC pin M, the relay J 2 coil the other end connects the relay J 2 contact J2-2 the other end respectively, the relay J 2 contact J2-3 the other end and the bulb Z2 the other end, the described bulb Z1 the other end connects the relay J 1 contact J1-1 the other end, described PLC pin Q0.0 connects diode DW1 negative pole and resistance R3 respectively, diode DW1 positive pole connection bulb Z3, the bulb Z3 the other end connects the relay J 0 coil the other end respectively, the resistance R3 the other end, the electric capacity C2 the other end, the resistance R1 the other end, the relay J 1 coil J1-3 the other end, electric capacity C1 and relay J 1 coil, the relay J 1 coil the other end contact resistance R4 the other end.
As the utility model further scheme: described diode DW1 is reference diode.
Compared with prior art; the beneficial effects of the utility model are: the utility model cooling tower solenoid valve automatic start-stop protecting control circuit; what can effectively prevent relay contact adhesion or relay coil short circuit and electromagnetic valve coil short circuit from causing is out of control; line construction is simple; cost is low; volume is little, applied widely.
Accompanying drawing explanation
Fig. 1 is the circuit diagram of cooling tower solenoid valve automatic start-stop protecting control circuit.
Embodiment
Below in conjunction with the accompanying drawing in the utility model embodiment, be clearly and completely described the technological scheme in the utility model embodiment, obviously, described embodiment is only the utility model part embodiment, instead of whole embodiments.Based on the embodiment in the utility model, those of ordinary skill in the art are not making the every other embodiment obtained under creative work prerequisite, all belong to the scope of the utility model protection.
Refer to Fig. 1, in the utility model embodiment, a kind of cooling tower solenoid valve automatic start-stop protecting control circuit, comprises PLC, resistance R1, electric capacity C1, relay J 0, key switch K1 and LED, described PLC pin L+ connects relay J 1 contact J1-1 and key switch K1 respectively, and the key switch K1 the other end connects relay J 0 contact J0-1, and the relay J 0 contact J0-1 the other end is contact resistance R4 respectively, solenoid valve DF, diode D2 negative pole and relay J 2 contact J2-3, diode D2 positive pole be the connected electromagnetic valve DF the other end respectively, relay J 2 contact J2-2 and relay J 2 contact J2-1, the relay J 2 contact J2-1 the other end is by relay J 1 contact J1-2 contact resistance R2, and the resistance R2 the other end connects relay J 1 contact J1-3 respectively, resistance R1, electric capacity C2, relay J 0 coil, bulb Z1, bulb Z2, relay J 2 coil and PLC pin M, the relay J 2 coil the other end connects the relay J 2 contact J2-2 the other end respectively, the relay J 2 contact J2-3 the other end and the bulb Z2 the other end, the described bulb Z1 the other end connects the relay J 1 contact J1-1 the other end, described PLC pin Q0.0 connects diode DW1 negative pole and resistance R3 respectively, diode DW1 positive pole connection bulb Z3, the bulb Z3 the other end connects the relay J 0 coil the other end respectively, the resistance R3 the other end, the electric capacity C2 the other end, the resistance R1 the other end, the relay J 1 coil J1-3 the other end, electric capacity C1 and relay J 1 coil, the relay J 1 coil the other end contact resistance R4 the other end.
Described diode DW1 is reference diode.
Working principle of the present utility model is: refer to Fig. 1, and the utility model circuit is made up of 3 relays, and its J0 is basic circuit assembly, and it controls by the output of PLC, the break-make of its normally opened contact J0-1 Controlling solenoid valve.Consider that the easy adhesion of relay contact and coil short can cause out of control causing the accident, add J1, J2 bis-relays and the original paper such as resistance, electric capacity, constitute the protective circuit of the power-off immediately when relay contact adhesion, coil short.
When 1, normally working: as the Q0.0=0 of PLC (solenoid valve DF does not work), its J0, J1, J2 and solenoid valve DF are all in off-position, alarm indicator lamp bubble Z1, Z2, Z3 all go out, when driving solenoid valve DF work, its Q0.0 exports and becomes 1 from 0, make J0 obtain electric adhesive, its normally opened contact J0-1 is closed makes solenoid valve DF obtain electric startup.Now J1 coil voltage is less than its minimum operate voltage, and J2 is in off-position.Therefore J1, J2 are not closed.
When solenoid valve DF quits work, namely when Q0.0 becomes 0 from 1, make J0 dead electricity, now D1 conducting starts continuous current discharge electricity, and when discharge current is less than the minimum operate current of J0, J0 disconnects by closing to become, its normally opened contact J0-1 disconnects, make solenoid valve DF power-off, continuous current discharge electricity is carried out in D2 conducting, guarantees that J0 contact J0-1 can not strike sparks and adhesion.
It is in a flash very of short duration that J0 dead electricity disconnects this, when D1 conducting afterflow, J0 coil two terminal voltage ≈ 0(-0.7V), therefore make J1 path of winding obtain electric admittance, due to C1 effect, J1 coil voltage increases by 0, when J0 normally-closed contact J0-1 is by when closing change disconnection, the minimum operate voltage of the raised voltage of its J1 coil still <J1, therefore make J1 coil not wait adhesive power-off once more, therefore J1 can not produce vibration at Q0.0 from moment that 1 becomes 0, thus guarantees that circuit operation is errorless.
2, during J0 contact adhesion: when Q0.0 becomes 0 from 1, J0 dead electricity is disconnected, if now the contact J0-1 of J0 sticks together and will make solenoid valve DF can not power-off, but because J0 disconnects, its D1 conducting afterflow, make J0 bis-terminal voltage ≈ 0, therefore it is electric to make J1 path of winding obtain, C1 is charged, and when C1 voltage is greater than J1 coil pick-up voltage, J1 coil is by adhesive self-locking, the normally-closed contact J1-2 of J1 disconnects, cutting off solenoid valve DF power supply makes it quit work, and normally opened contact J1-1 and J1-3 of J1 closes, and making again alarm indicator lamp steep, Z1 is bright carries out " adhesion " and report to the police.
3, during solenoid valve DF coil short: as Q0.0=1, J0 adhesive, solenoid valve DF action.As now solenoid valve DF coil suddenly-applied short circuit, voltage must be made to be added on J2 and R2, because R2 resistance is very little, very large electric current harm power supply can be produced, but due to and have J2(voltage=24V now), therefore make J2 adhesive self-locking, the normally-closed contact J2-2 of J2 disconnects, cut off solenoid valve DF, normally opened contact J2-1 and J2-3 of J2 closes, and Z2 is bright to report to the police to make again alarm indicator lamp steep.
4, during J0 coil short: J0 operating voltage elects 12V as, and its output voltage 24V during Q0.0=1, can work under normal voltage for making J0, J0 R1 in parallel, be connected in series a resistance R3 again, like this as Q0.0=1, the voltage of J0 coil equals 12V, now R3 voltage also equals 12V, due to the voltage stabilizing value lower than reference diode DW1, the non-conducting of DW1, Z3 lamp does not work, the object of series resistor R3 can not burn PLC output point for preventing during J0 coil short: as J0 coil short, the resistance R3 of series connection with it will become the output loading of Q0.0, now the output current of PLC is only twice than output current time normal, therefore the output point of PLC can not be burnt.And now R3 voltage equals 24V, be greater than the voltage stabilizing value of DW1, therefore make DW1 admittance, Z3 lamp is bright, namely sends J0 coil short and reports to the police.
To those skilled in the art, obvious the utility model is not limited to the details of above-mentioned one exemplary embodiment, and when not deviating from spirit of the present utility model or essential characteristic, can realize the utility model in other specific forms.Therefore, no matter from which point, all should embodiment be regarded as exemplary, and be nonrestrictive, scope of the present utility model is limited by claims instead of above-mentioned explanation, and all changes be therefore intended in the implication of the equivalency by dropping on claim and scope are included in the utility model.Any reference character in claim should be considered as the claim involved by limiting.
In addition, be to be understood that, although this specification is described according to mode of execution, but not each mode of execution only comprises an independently technological scheme, this narrating mode of specification is only for clarity sake, those skilled in the art should by specification integrally, and the technological scheme in each embodiment also through appropriately combined, can form other mode of executions that it will be appreciated by those skilled in the art that.
Claims (2)
1. a cooling tower solenoid valve automatic start-stop protecting control circuit, comprises PLC, resistance R1, electric capacity C1, relay J 0, key switch K1 and LED, it is characterized in that, described PLC pin L+ connects relay J 1 contact J1-1 and key switch K1 respectively, and the key switch K1 the other end connects relay J 0 contact J0-1, and the relay J 0 contact J0-1 the other end is contact resistance R4 respectively, solenoid valve DF, diode D2 negative pole and relay J 2 contact J2-3, diode D2 positive pole be the connected electromagnetic valve DF the other end respectively, relay J 2 contact J2-2 and relay J 2 contact J2-1, the relay J 2 contact J2-1 the other end is by relay J 1 contact J1-2 contact resistance R2, and the resistance R2 the other end connects relay J 1 contact J1-3 respectively, resistance R1, electric capacity C2, relay J 0 coil, bulb Z1, bulb Z2, relay J 2 coil and PLC pin M, the relay J 2 coil the other end connects the relay J 2 contact J2-2 the other end respectively, the relay J 2 contact J2-3 the other end and the bulb Z2 the other end, the described bulb Z1 the other end connects the relay J 1 contact J1-1 the other end, described PLC pin Q0.0 connects diode DW1 negative pole and resistance R3 respectively, diode DW1 positive pole connection bulb Z3, the bulb Z3 the other end connects the relay J 0 coil the other end respectively, the resistance R3 the other end, the electric capacity C2 the other end, the resistance R1 the other end, the relay J 1 coil J1-3 the other end, electric capacity C1 and relay J 1 coil, the relay J 1 coil the other end contact resistance R4 the other end.
2. cooling tower solenoid valve automatic start-stop protecting control circuit according to claim 1, it is characterized in that, described diode DW1 is reference diode.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201520927117.4U CN205173652U (en) | 2015-11-19 | 2015-11-19 | Protection control circuit is stopped to automatic opening of cooling tower solenoid valve |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201520927117.4U CN205173652U (en) | 2015-11-19 | 2015-11-19 | Protection control circuit is stopped to automatic opening of cooling tower solenoid valve |
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| Publication Number | Publication Date |
|---|---|
| CN205173652U true CN205173652U (en) | 2016-04-20 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201520927117.4U Expired - Fee Related CN205173652U (en) | 2015-11-19 | 2015-11-19 | Protection control circuit is stopped to automatic opening of cooling tower solenoid valve |
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| CN (1) | CN205173652U (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106558949A (en) * | 2016-11-29 | 2017-04-05 | 洛阳毅兴石化电器仪表设备有限公司 | A kind of petroleum recovering device cooling control system |
-
2015
- 2015-11-19 CN CN201520927117.4U patent/CN205173652U/en not_active Expired - Fee Related
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106558949A (en) * | 2016-11-29 | 2017-04-05 | 洛阳毅兴石化电器仪表设备有限公司 | A kind of petroleum recovering device cooling control system |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| CF01 | Termination of patent right due to non-payment of annual fee |
Granted publication date: 20160420 Termination date: 20211119 |
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| CF01 | Termination of patent right due to non-payment of annual fee |