CN201821624U - Device for improving work environment of programmable logic controller (PLC) - Google Patents
Device for improving work environment of programmable logic controller (PLC) Download PDFInfo
- Publication number
- CN201821624U CN201821624U CN2010202533652U CN201020253365U CN201821624U CN 201821624 U CN201821624 U CN 201821624U CN 2010202533652 U CN2010202533652 U CN 2010202533652U CN 201020253365 U CN201020253365 U CN 201020253365U CN 201821624 U CN201821624 U CN 201821624U
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- plc
- humidity sensor
- relay
- fan
- temperature switch
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Abstract
The utility model discloses a device for improving the work environment of a programmable logic controller (PLC), which comprises a fan, a relay, a heating body, a humidity sensor and a temperature switch, wherein the fan and the relay are arranged inside a PLC casing and are respectively connected onto a PLC power supply, the humidity sensor can set a critical value, the heating body is arranged between two PLC circuit boards, the humidity sensor and the temperature switch are arranged on the PLC circuit boards, one end of the humidity sensor is electrically connected with one end of the heating body, the other end of the humidity sensor is electrically connected with the relay, the other end of the heating body is electrically connected with the PLC power supply, one end of the temperature switch is electrically connected with the fan, and the other end of the temperature switch is electrically connected with the relay. The device has simple structure, the humidity sensor is connected with the heating body, the temperature switch is connected with the fan, the humidity and the temperature inside the PLC can be maintained in a certain range, the work capability of the PLC in severe environment can be improved, in addition, the PLC can be normally started only under the condition that both the temperature and the humidity inside the PLC are normal, and the stability of the PLC is ensured.
Description
Technical field
The utility model belongs to the PLC technical field, especially relates to a kind of device of the PLC of improvement operational environment.
Background technology
The PLC technology is to there being outstanding effect at electronic technology field at present, but existing P LC all can't use under the environment of high humility and high temperature, particularly lower and go back damage and the misoperation that use under the situation of dew can cause the PLC circuit board at temperature, serious words also can produce short circuit, breaking out of fire is even and also can cause the aging of PLC circuit under obsolete situation.Therefore be necessary to be improved.
The utility model content
At the deficiency that above-mentioned prior art exists, the purpose of this utility model provides a kind of device of the PLC of improvement operational environment, and it has dehumidifying, cooling, improves the characteristics of the ability to work of PLC under adverse circumstances.
To achieve these goals, the technical scheme that the utility model adopted is: a kind of device of the PLC of improvement operational environment, comprise the fan and the relay that are installed in the PLC enclosure interior, fan and relay are connected on the PLC power supply, also comprise heater, the humidity sensor that critical value can be set and temperature switch; Described heater is arranged between the two PLC circuit boards, and humidity sensor and temperature switch are arranged on the PLC circuit board; The normally opened contact of humidity sensor is connected with an end lead of heater, and the other end is connected with the input power lead; The normally-closed contact of humidity sensor is connected with an end lead of relay, and the other end is connected with the input power lead; The heater other end is connected with the input power lead; Be connected with fan leads the normal battle of temperature switch, and the other end is connected with the input power lead.
Being shaped as of described heater is with shape and limit temperature certainly.
After adopting said structure, the utility model is compared the advantage that is had with prior art: of the present utility model simple in structure, humidity sensor is connected with heater, temperature switch is connected with fan, can allow PLC interior humidity and temperature remain in certain scope, improve the ability to work of PLC under adverse circumstances.
Description of drawings
Below in conjunction with drawings and Examples the utility model is further specified.
Fig. 1 is a front view of the present utility model.
Fig. 2 is a vertical view of the present utility model.
Fig. 3 is a circuit connection diagram of the present utility model.
Among the figure: 1, PLC shell; 2, PLC circuit board; 3, calandria; 4, temperature switch; 5, humidity sensor; 6, relay; 7, fan.
Embodiment
The following stated only is preferred embodiment of the present utility model, does not therefore limit protection range of the present utility model.
Embodiment, see that Fig. 1 is to shown in Figure 3: a kind of device of the PLC of improvement operational environment, comprise the fan and the relay that are installed in the PLC enclosure interior, fan and relay are connected on the PLC power supply; Also comprise heater, humidity sensor and temperature switch, wherein humidity sensor can be provided with the minimum and the highest critical value of humidity, and temperature switch can be provided with the highest critical value of temperature; Shape is with in being shaped as of described heater, and can be automatically to self limit temperature, and heater is arranged between the two PLC circuit boards; Humidity sensor and temperature switch are arranged on the PLC circuit board, and the normally opened contact of humidity sensor is electrically connected with an end of heater, and normally-closed contact is electrically connected with relay; The heater other end is electrically connected with the PLC power supply; Be electrically connected with fan the normal battle of temperature switch, and normally closed point is electrically connected with relay.
Operation principle of the present utility model: humidity sensor of the present utility model can be provided with the minimum and the highest critical value of humidity, can start heater during high critical value and come transpiring moisture when the PLC humidity inside arrives it, the PLC interior humidity is remained in certain scope; When the PLC humidity inside is lower than the lowest critical value of its setting, but engage relay starts PLC.Link to each other with fan the normal battle of temperature switch, when the temperature in the PLC arrives its critical value, can start fan hot gas in the PLC and moisture are taken away.Guaranteed that by above function PLC could normally start under the normal situation of PLC temperature inside and humidity, avoided misoperation, the generation of minimizing accident has prolonged useful life of PLC.
Claims (2)
1. a device that improves the PLC operational environment comprises the fan and the relay that are installed in the PLC enclosure interior, and fan and relay are connected on the input power supply, it is characterized in that: also comprise heater, the humidity sensor that critical value can be set and temperature switch; Described heater is arranged between the two PLC circuit boards, and humidity sensor and temperature switch are arranged on the PLC circuit board; The normally opened contact of humidity sensor is connected with an end lead of heater, and the other end is connected with the input power lead; The normally-closed contact of humidity sensor is connected with an end lead of relay, and the other end is connected with the input power lead; The heater other end is connected with the input power lead; Be connected with fan leads the normal battle of temperature switch, and the other end is connected with the input power lead.
2. a kind of device that improves the PLC operational environment according to claim 1 is characterized in that: being shaped as of described heater is with shape and limit temperature certainly.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2010202533652U CN201821624U (en) | 2010-07-08 | 2010-07-08 | Device for improving work environment of programmable logic controller (PLC) |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2010202533652U CN201821624U (en) | 2010-07-08 | 2010-07-08 | Device for improving work environment of programmable logic controller (PLC) |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN201821624U true CN201821624U (en) | 2011-05-04 |
Family
ID=43919565
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN2010202533652U Expired - Fee Related CN201821624U (en) | 2010-07-08 | 2010-07-08 | Device for improving work environment of programmable logic controller (PLC) |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN201821624U (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103166726A (en) * | 2013-02-20 | 2013-06-19 | 深圳市泰金田科技有限公司 | Integral broadcast early warning device based on wireless communication, broadcast early warning system and host |
| CN104291220A (en) * | 2014-09-28 | 2015-01-21 | 河南重工起重机集团有限公司 | Special dew detection and dew removal system for crane |
-
2010
- 2010-07-08 CN CN2010202533652U patent/CN201821624U/en not_active Expired - Fee Related
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103166726A (en) * | 2013-02-20 | 2013-06-19 | 深圳市泰金田科技有限公司 | Integral broadcast early warning device based on wireless communication, broadcast early warning system and host |
| CN103166726B (en) * | 2013-02-20 | 2015-07-01 | 深圳市泰金田科技有限公司 | Integral broadcast early warning device based on wireless communication, broadcast early warning system and host |
| CN104291220A (en) * | 2014-09-28 | 2015-01-21 | 河南重工起重机集团有限公司 | Special dew detection and dew removal system for crane |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| C17 | Cessation of patent right | ||
| CF01 | Termination of patent right due to non-payment of annual fee |
Granted publication date: 20110504 Termination date: 20110708 |