CN203772118U - Automatic curtain type anti-icing control system of water cooling tower - Google Patents
Automatic curtain type anti-icing control system of water cooling tower Download PDFInfo
- Publication number
- CN203772118U CN203772118U CN201420175920.2U CN201420175920U CN203772118U CN 203772118 U CN203772118 U CN 203772118U CN 201420175920 U CN201420175920 U CN 201420175920U CN 203772118 U CN203772118 U CN 203772118U
- Authority
- CN
- China
- Prior art keywords
- curtain
- cooling tower
- control system
- steel pipe
- automatic control
- 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.)
- Expired - Fee Related
Links
Landscapes
- Operating, Guiding And Securing Of Roll- Type Closing Members (AREA)
Abstract
The utility model provides an automatic curtain type anti-icing control system of a water cooling tower. The automatic curtain type anti-icing control system comprises a mechanical executing unit which comprises a door frame, a curtain, steel tubes, a lifting motor and a lifting belt. Stand columns on the two sides of the door frame are provided with vertical guide rails. The upper end of the curtain is arranged on a beam of the door frame. The steel tubes are horizontally arranged on the curtain at intervals. The two ends of each steel tube are in the vertical guide rail on the corresponding side. The lifting motor is arranged above the door frame, an output shaft of the lifting motor is provided with a dragging running wheel which is wound by the upper end of the lifting belt, and the lower end of the lifting belt is connected with the steel tube at the lowest part of the curtain. The automatic curtain type anti-icing control system of the water cooling tower has the advantages of being high in working efficiency, good in cooling efficiency and safety performance, low in maintaining cost and maintaining intensity and small in amount of needed steel.
Description
Technical field
The utility model relates to a kind of anti-freeze automatic control system, relates in particular to the anti-freeze automatic control system of a kind of cooling tower curtain-type.
Background technology
In northern China, its weather belongs to the seasonal continental climate in temperate zone more, and winter temperature is minimum reaches subzero 50 degrees Celsius.So invasion and attack of very easily being frozen during in normal work at the cooling tower in the thermal power plant of northern area.Cooling tower easily causes following situation after freezing:
1, circulation area diminishes, and then has affected the cooling effect of cooling water, impels cooling water water temperature to raise, and has affected the vacuum of condenser, reduces unit efficiency;
2, the icing of the degree of depth can damage cooling inner-tower filling material, and then lowers cooling effect, moreover changes that filler is time-consuming takes a lot of work, and maintenance cost strengthens;
3, root out that freezing icicle is time-consuming takes a lot of work, security incident easily occurs simultaneously;
4, prolonged freezing can produce and destroy the building of cooling tower self, and it is also high to repair price.
Utility model content
The deficiency existing for prior art, the purpose of this utility model is to provide the cooling tower curtain-type that a kind of operating efficiency is high, cooling effectiveness is good, security is good and maintenance cost is low anti-freeze automatic control system.
For achieving the above object, the utility model provides a kind of cooling tower curtain-type anti-freeze automatic control system, comprise mechanical performance element, described mechanical performance element comprises doorframe, curtain, steel pipe, lifting motor and elevator belt, on two heel posts of described doorframe, be provided with upright guide rail, the upper end of described curtain is arranged on the crossbeam of described doorframe, described steel pipe horizontal interval is arranged on described curtain, the two ends of described steel pipe are arranged in the described upright guide rail of a corresponding side, described lifting motor is arranged on described doorframe top, on the output shaft of described lifting motor, traction sheave is installed, the upper end of described elevator belt is wrapped on described traction sheave, the lower end of described elevator belt be arranged on described curtain the most described steel pipe of below be connected.。
Preferably, also comprise electrical control unit, described electrical control unit comprises temperature collecting cell, controller, shade position feedback device and remote terminal, the driving chip of described temperature collecting cell and described lifting motor all communicates to connect with described controller, described shade position feedback device is integrated on the driving chip of described lifting motor, described controller and the communication connection of described remote terminal.
Preferably, described mechanical performance element also comprises the fixed mount being equipped with cooling tower, described fixed mount is obliquely installed, on described fixed mount, be erected with ceiling, described ceiling one side is on the lower bent to form sunshading board downwards, and described doorframe and described lifting motor are all positioned at described sunshading board inner side.
Preferably, described steel pipe two ends are all provided with roller, and described roller rolls and coordinates with described upright guide rail.
Preferably, described elevator belt is many, and many described elevator belts are uniformly distributed on described steel pipe, and the upper end of many described elevator belts is all wrapped on described traction sheave.
Preferably, described elevator belt lower end is provided with jam head, on described steel pipe, has through hole, and described elevator belt is through the most described through hole of the described steel pipe in below, and described jam head is stuck in described through hole outside.
Preferably, described temperature collecting cell comprises outdoor temperature sensor and recirculated water cooling-water temperature sensor, and described outdoor sensor setting is outside curtain, and described recirculated water cooling-water temperature sensor is arranged at recirculated water and goes out Ta Kou.
Preferably, described controller is programmable logic controller (PLC) or dcs.
Preferably, the angle of inclination of described fixed mount is 15 ° to 30 °.
The anti-freeze automatic control system of cooling tower curtain-type that the utility model provides has advantages of that operating efficiency is high, cooling effectiveness is good, security is good and maintenance cost is low, repair density is low and steel used are few.
Accompanying drawing explanation
Fig. 1 is the structural representation of the anti-freeze automatic control system machinery of the utility model cooling tower curtain-type performance element;
Fig. 2 is the right view of the anti-freeze automatic control system machinery of the utility model cooling tower curtain-type performance element;
Fig. 3 is the operation principle schematic diagram of the anti-freeze automatic control system of the utility model cooling tower curtain-type;
Fig. 4 is the workflow diagram of the anti-freeze automatic control system of the utility model cooling tower curtain-type.
In figure: 1-fixed mount, 2-ceiling, 3-doorframe, 4-lifting motor, 5-sunshading board, 6-elevator belt, 7-steel pipe, 8-curtain, 9-upright guide rail.
The specific embodiment
Below in conjunction with accompanying drawing, the utility model is described further:
Please refer to Fig. 1 and Fig. 2, Fig. 1 is the structural representation of the anti-freeze automatic control system machinery of the utility model cooling tower curtain-type performance element, and Fig. 2 is the right view of the anti-freeze automatic control system machinery of the utility model cooling tower curtain 8 formula performance element.
Comprise mechanical performance element, described mechanical performance element comprises doorframe 3, curtain 8, steel pipe 7, lifting motor 4 and elevator belt 6, on two heel posts of described doorframe 3, be provided with upright guide rail 9, the upper end of described curtain 8 is arranged on the crossbeam of described doorframe 3, described steel pipe 7 horizontal intervals are arranged on described curtain 8, the two ends of described steel pipe 7 are arranged in the described upright guide rail 9 of a corresponding side, described lifting motor 4 is arranged on described doorframe 3 tops, on the output shaft of described lifting motor 4, traction sheave is installed, the upper end of described elevator belt 6 is wrapped on described traction sheave, the lower end of described elevator belt 6 be arranged on described curtain 8 the most described steel pipe 7 of below be connected.
Cooling tower ventilating opening place is provided with a plurality of mechanical performance elements, each mechanical performance element mainly forms a doorframe 3 by two columns and crossbeam and with fixing ground, on two column vertical directions of doorframe 3, be equipped with a upright guide rail 9, adopt steel pipe 7 and be attached on curtain 8.Lifting motor 4 is by controlling the lifting of steel pipe 7 bottom, steel pipe 7 moves up and down under the affecting of elevator belt 6 along the guide rail on two heel posts bottom, drive other steel pipe 7 motions, thereby drive curtain 8 to promote and decline, and then control the incoming air area of cooling tower ventilating opening, finally control the water temperature of cooling tower recirculated water.This structure adopt to strengthen steel pipe 7 be curtain 8 more stable perpendicular to ground direction, avoid rocking before and after causing greatly because of wind.
The advantage of the two guide rails of single-rail is: simple in structure, easy to maintenance, repair density is low and steel used are few.In lifting process, wherein the traction of the steel pipe in a guide rail is completed by curtain itself in addition, and when environment wind-force is larger, because the frictional resistance of steel pipe and guide rail is very large, so be applied to curtain, originally pulling force is with it naturally very large, easily damage.Moreover, when weather is warm, curtain all need to be risen to top, it is chronic that curtain exists on top, the curtain of one guide rail is subject to the active force of steel pipe self from start to finish, this situation does not just exist at single-rail, from rising to for a long time in tip position, stressed is leash all the time.Because the two ends at steel pipe is installed respectively roller, when promoting, the frictional resistance of steel pipe and guide rail is little like this, and in the situation that environment has wind, lifting force is not installed the little a lot of of roller, and lifting motor power is naturally less than normal, saves electric energy.Moreover, due to the existence of roller, the contact-making surface of steel tube head and guide rail side is strengthened, the unsuitable bite of steel pipe, and bite easily causes the inclination of steel pipe, makes the easy getaway of steel pipe.
Please refer to Fig. 3 and Fig. 4, Fig. 3 is the operation principle schematic diagram of the anti-freeze automatic control system of the utility model cooling tower curtain-type, and Fig. 4 is the workflow diagram of the anti-freeze automatic control system of the utility model cooling tower curtain-type.
Also comprise electrical control unit, described electrical control unit comprises temperature collecting cell, controller, curtain 8 position feedback devices and remote terminal, the driving chip of described temperature collecting cell and described lifting motor all communicates to connect with described controller, described curtain 8 position feedback devices are integrated on the driving chip of described lifting motor 4, described controller and the communication connection of described remote terminal.
Temperature collecting cell is temperature sensor, obtains the outer temperature information of cooling tower periphery compartment temperature variations is transferred to controller.Curtain 8 position feedback devices are thought the position of controller feedback curtain 8, controller feeds back to remote terminal (PC) by associated temperature information and shade position information, to complete manual operation, controller gets a promotion or reduces after curtain 8 height instructions, be transferred to the lifting motor 4 of mechanical performance element, thereby complete curtain 8 descending operations, the program auto-control that controller also can be set in advance certainly.
Remote terminal has realized human-computer dialogue with industrial computer.By upper software, by time real picture on the spot, reflection intuitively on computers, facilitates operations staff's operated from a distance.Recirculated water goes out tower water temperature, natural environment temperature, when the parameters such as position feedback of curtain 8 are equal, reality is presented in upper picture, operation person is according to data, can remote manual control the aperture of curtain 8 on the spot, to change the area of cooling tower ventilating opening, regulate ventilation, prevent that cooling tower from freezing and guaranteeing that circulating water temperature is in optimum temperature range.
Described mechanical performance element also comprises the fixed mount 1 being equipped with cooling tower, described fixed mount 1 is obliquely installed, on described fixed mount 1, be erected with ceiling 2, described ceiling 2 one side is on the lower bent to form sunshading board 5 downwards, and described doorframe 3 and described lifting motor 4 are all positioned at described sunshading board 5 inner sides.
Fixed mount 1 be make doorframe 3 be attached to cooling tower outer wall on, ceiling 2 is that protection upper space exempts from erosion and the insulation of sleet, be obliquely installed for can make rainwater or melt after snow-broth along ceiling 2, flow down, reduce the heavy burden of ceiling 2 simultaneously.Sunshading board 5 is that after protection motor and relevant electric elements exempt from the erosion of sleet and weather curtain 8 is all raised to place, top when warm, protection curtain 8 exempts from tanning by the sun of daylight.
At described steel pipe 7 two ends, roller is all installed, described roller rolls and coordinates with described upright guide rail 9.
The friction producing when roller is set with reduction steel pipe 7 lifting action, improves equipment durability.
Described elevator belt 6 is many, and many described elevator belts 6 are uniformly distributed on described steel pipe 7, and the upper end of many described elevator belts 6 is all wrapped on described traction sheave.
When many elevator belts 6 being set can guaranteeing that curtain 8 promotes, horizontal direction is stable.
Described elevator belt 6 lower ends are provided with jam head, on described steel pipe 7, have through hole, and described elevator belt 6 is through the most described through hole of the described steel pipe 7 in below, and described jam head is stuck in described through hole outside.
Described temperature collecting cell comprises outdoor temperature sensor and recirculated water cooling-water temperature sensor, and described outdoor sensor setting is outside curtain 8, and described recirculated water cooling-water temperature sensor is arranged at recirculated water and goes out Ta Kou.
The east, south, west, north of cooling tower, the southeast, northeast, southwest and eight of northwests direction, respectively corresponding eight controllers.Take to control respectively the method for centralized management, the lifting curtain of water tower different directions is done to grouping and control.Eight directions due to water tower, are subject to the impact at wind direction, wind-force and sunshine, and natural environment temperature has a little temperature difference, so take eight group controllers to control more accurately the grouping action of curtain 8.In the winter time, windward side, all the time according to situation under, the corresponding controller of this face can suitably regulate curtain 8 apertures according to natural environment temperature, adjusts the area of water tower ventilating opening, prevents that the water tower that this side up from freezing; And now, lee face, have the direction at sunshine, and adjusting curtain 8 apertures that the corresponding controller of this face can be suitable according to natural environment temperature, the water tower of anti-direction here freezes.
The configuration of many group controllers, makes to control more flexible, reliable.Avoided the caused control system paralysis of controller power down or fault.
By monitoring cooling tower external temperature and recirculated water tower exit temperature, regulate in real time curtain 8 liftings, control intake, thereby the temperature that guarantees cooling-tower circulating water is in the scope of application, avoids icing.
Described controller is programmable logic controller (PLC) (PLC) or dcs (DCS).
The anti-freeze automatic control system of cooling tower curtain-type is that PLC, DCS are applied in the anti-freeze project of cooling tower.Taked a kind of more reliable and effective water tower circulating water temperature to regulate and cold-proof technology, guaranteed that water tower filler avoids freezing and recirculated water water temperature to remain under economic running parameters constant.
The angle of inclination of described fixed mount 1 is 15 ° to 30 °.
The trickling that adopts this angle can be beneficial to ceiling 2 rainwater and snow-broth is come down in torrents.
Remote manual operation, operations staff is by remote terminal (PC), the monitoring of reality when the ruuning situation of on-the-spot cooling tower is done.Natural environment temperature, the recirculated water that collecting unit collects goes out the A/D modular converter of tower saliva temperature by PLC and carries out A/D conversion, communication module by the result after conversion by PLC and remote terminal is sent in upper picture, operations staff by time real data judge, the aperture position of curtain 8 (aperture scope 0 → 100%), and by concrete opening value by the window that arranges of picture, deliver to the output module of controller, drive to promote curtain action, to reach, prevent that long-range hand that cooling tower freezes from controlling the object of system.
Curtain 8 position feedback devices are input to the position feed back signal that promotes curtain in PLC/DCS, as the important parameter of realizing closed-loop control in program.Operating personnel, in remote terminal, are switched to long-range hand operating state by the long-range hand behaviour/automatic button in upper picture.According to natural environment temperature and recirculated water, go out tower saliva temperature, on picture, manually input drives the desired value that promotes curtain action.Controller will promote in the location feedback value of curtain 8 and the servo block of desired value in program and compare, and by the result after relatively, export to the output of controller.Output can drive lifting curtain 8 actions in corresponding region.When the position feedback after action equates with desired value, the signal of controller output " stopping " is to curtain 8 drive units.Now, promoting curtain 8 stops in the target aperture that operating personnel set.
Remote auto is controlled, and the position signalling that collecting unit goes out tower water temperature and lifting curtain by temperature sensor and curtain 8 position feedback devices by the natural environment temperature, the recirculated water that participate in controlling inputs to controller.Controller carries out these input signals computing in program, and the result after computing is exported to and promoted curtain 8 drive unit actions.When natural environment temperature raises, suitably open and promote curtain 8; When natural environment temperature declines, suitably close and promote curtain 8; When circulating water temperature off-rating, suitably regulate and promote curtain 8 apertures, to adjust circulating water temperature in setting range value.
Operating personnel, in remote terminal, are switched to remote auto state by the long-range hand behaviour/automatic button in upper picture.Temperature sensor goes out by natural environment temperature and recirculated water the thermal resistance input modular converter that tower saliva temperature is input to controller, program compares the temperature range of the temperature value collecting and programming, the opening value that is lifting curtain 8 by the results conversion relatively, export to the servo block in program, to determine the opening value that promotes curtain 8.Servo block carries out comparison operation again according to the position feedback and the opening value after computing that promote curtain 8, by final comparative result, exports to the output of controller.Output can drive lifting curtain 8 actions in corresponding region.When the position feedback after action equates with desired value, the signal of controller output " stopping " is to curtain 8 drive units.Now, promoting curtain stops in the target aperture that program calculates.
Above-described embodiment is only for the utility model creation example is clearly described, and not the utility model is created the restriction of the specific embodiment.For those of ordinary skill in the field, can also make other changes in different forms on the basis of the above description.Here exhaustive without also giving all embodiments.All any apparent variations of being extended out within spirit of the present utility model and principle or change are still among the utility model is created the protection domain of claim.
Claims (9)
1. the anti-freeze automatic control system of cooling tower curtain-type, comprise mechanical performance element, it is characterized in that: described mechanical performance element comprises doorframe, curtain, steel pipe, lifting motor and elevator belt, on two heel posts of described doorframe, be provided with upright guide rail, the upper end of described curtain is arranged on the crossbeam of described doorframe, described steel pipe horizontal interval is arranged on described curtain, the two ends of described steel pipe are arranged in the described upright guide rail of a corresponding side, described lifting motor is arranged on described doorframe top, on the output shaft of described lifting motor, traction sheave is installed, the upper end of described elevator belt is wrapped on described traction sheave, the lower end of described elevator belt be arranged on described curtain the most described steel pipe of below be connected.
2. the anti-freeze automatic control system of cooling tower curtain-type according to claim 1, it is characterized in that: also comprise electrical control unit, described electrical control unit comprises temperature collecting cell, controller, shade position feedback device and remote terminal, the driving chip of described temperature collecting cell and described lifting motor all communicates to connect with described controller, described shade position feedback device is integrated on the driving chip of described lifting motor, described controller and the communication connection of described remote terminal.
3. the anti-freeze automatic control system of cooling tower curtain-type according to claim 1, it is characterized in that: described mechanical performance element also comprises the fixed mount being equipped with cooling tower, described fixed mount is obliquely installed, on described fixed mount, be erected with ceiling, described ceiling one side is on the lower bent to form sunshading board downwards, and described doorframe and described lifting motor are all positioned at described sunshading board inner side.
4. the anti-freeze automatic control system of cooling tower curtain-type according to claim 1, is characterized in that: at described steel pipe two ends, roller is all installed, described roller rolls and coordinates with described upright guide rail.
5. the anti-freeze automatic control system of cooling tower curtain-type according to claim 1, it is characterized in that: described elevator belt is many, many described elevator belts are uniformly distributed on described steel pipe, and the upper end of many described elevator belts is all wrapped on described traction sheave.
6. according to the anti-freeze automatic control system of cooling tower curtain-type described in claim 1,4 or 5, it is characterized in that: described elevator belt lower end is provided with jam head, on described steel pipe, have through hole, described elevator belt is through the most described through hole of the described steel pipe in below, and described jam head is stuck in described through hole outside.
7. the anti-freeze automatic control system of cooling tower curtain-type according to claim 2, it is characterized in that: described temperature collecting cell comprises outdoor temperature sensor and recirculated water cooling-water temperature sensor, described outdoor sensor setting is outside curtain, and described recirculated water cooling-water temperature sensor is arranged at recirculated water and goes out Ta Kou.
8. the anti-freeze automatic control system of cooling tower curtain-type according to claim 2, is characterized in that: described controller is programmable logic controller (PLC) or dcs.
9. the anti-freeze automatic control system of cooling tower curtain-type according to claim 3, is characterized in that: the angle of inclination of described fixed mount is 15 ° to 30 °.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201420175920.2U CN203772118U (en) | 2014-04-11 | 2014-04-11 | Automatic curtain type anti-icing control system of water cooling tower |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201420175920.2U CN203772118U (en) | 2014-04-11 | 2014-04-11 | Automatic curtain type anti-icing control system of water cooling tower |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN203772118U true CN203772118U (en) | 2014-08-13 |
Family
ID=51289302
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201420175920.2U Expired - Fee Related CN203772118U (en) | 2014-04-11 | 2014-04-11 | Automatic curtain type anti-icing control system of water cooling tower |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN203772118U (en) |
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104457396A (en) * | 2014-11-19 | 2015-03-25 | 珠海格力电器股份有限公司 | Heat exchanger anti-freezing method and system |
| CN105953635A (en) * | 2016-07-05 | 2016-09-21 | 华北电力大学（保定） | Upper outer lifting and lower outer inclined center shaft combined plate type cooling tower wind shielding device |
| CN106017198A (en) * | 2016-07-05 | 2016-10-12 | 华北电力大学（保定） | Upper outer lifting lower inner inclined off-axis combined plate type wind shielding device of cooling tower |
| CN106767121A (en) * | 2016-12-27 | 2017-05-31 | 苏州祥弘源电子科技有限公司 | A kind of automatic temperature controlling recirculated water adjusting means |
-
2014
- 2014-04-11 CN CN201420175920.2U patent/CN203772118U/en not_active Expired - Fee Related
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104457396A (en) * | 2014-11-19 | 2015-03-25 | 珠海格力电器股份有限公司 | Heat exchanger anti-freezing method and system |
| CN105953635A (en) * | 2016-07-05 | 2016-09-21 | 华北电力大学（保定） | Upper outer lifting and lower outer inclined center shaft combined plate type cooling tower wind shielding device |
| CN106017198A (en) * | 2016-07-05 | 2016-10-12 | 华北电力大学（保定） | Upper outer lifting lower inner inclined off-axis combined plate type wind shielding device of cooling tower |
| CN106767121A (en) * | 2016-12-27 | 2017-05-31 | 苏州祥弘源电子科技有限公司 | A kind of automatic temperature controlling recirculated water adjusting means |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| CN203772118U (en) | Automatic curtain type anti-icing control system of water cooling tower | |
| CN102538504B (en) | Optimized energy-saving cold-preventing system and method at air inlet sides of cooling tower | |
| CN104025952B (en) | A kind of greenhouse curtain-rolling machine and vent integral control system and method | |
| KR101649762B1 (en) | Blind system for sunlight generation and sunlight generation method using this | |
| CN204594273U (en) | A kind of louvered water tower frigid-proof device | |
| CN103104071B (en) | Intelligent snow-removing and solar-protection device | |
| CN104756826B (en) | A kind of improved wind-proof intelligent Sprinkling Irrigation | |
| CN102995802A (en) | Double-layer glass curtain wall utilizing solar energy | |
| CN103590975B (en) | A kind of environmentally friendly control system of wind turbines and method | |
| CN204860342U (en) | Intelligence warmhouse booth | |
| CN207039532U (en) | A kind of roof linkage tracking photovoltaic bracket and photovoltaic generating system | |
| CN206860506U (en) | A kind of solar energy ventilating fan | |
| CN102860234A (en) | Unmanned vegetable greenhouse shutter machine | |
| CN112449908B (en) | Light following and supplementing system in facility cultivation | |
| CN103314810A (en) | Wet curtain fan circulating ventilation cooling system of solar greenhouse | |
| CN104982373A (en) | Energy-saving aerator | |
| CN209824619U (en) | Liftable agricultural planting big-arch shelter | |
| CN205266756U (en) | Vocal combination formula bird repellent device of wind -force reflection of light | |
| CN107171627A (en) | A kind of agricultural greenhouse linkage tracking photovoltaic bracket and photovoltaic generating system | |
| CN106978869A (en) | Utilize wind energy and the high-rise building production capacity curtain wall of solar energy | |
| CN202442605U (en) | Energy-saving cold-proof system for follow-up soft rolling curtain of cooling tower | |
| CN202442604U (en) | Follow-up folding-curtain type energy-saving cold-proof system of cooling tower | |
| CN201004861Y (en) | Greenhouse device | |
| CN202442606U (en) | Follow-up accumulated curtain-type energy-saving cold prevention system of cooling tower | |
| CN211909861U (en) | Intelligent greenhouse system based on internet of things |
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 | ||
| CF01 | Termination of patent right due to non-payment of annual fee |
Granted publication date: 20140813 Termination date: 20200411 |