CN220287778U

CN220287778U - Hot water intelligent control system based on PLC

Info

Publication number: CN220287778U
Application number: CN202321929128.7U
Authority: CN
Inventors: 方秋宝; 赵航
Original assignee: Jiangsu Huilifeng Energy Saving And Environmental Protection Technology Co ltd
Current assignee: Jiangsu Huilifeng Energy Saving And Environmental Protection Technology Co ltd
Priority date: 2023-07-21
Filing date: 2023-07-21
Publication date: 2024-01-02
Anticipated expiration: 2033-07-21

Abstract

The utility model discloses a hot water intelligent control system based on a PLC (programmable logic controller), which comprises a PLC controller, a constant-temperature water tank, a cold water pipe, a hot water pipe and a mixed water pipe, wherein electromagnetic valves and proportional integral valves are arranged on the cold water pipe and the hot water pipe; the water supply loop comprises a water outlet pipe for supplying water to a user and a water return pipe for returning water to the constant-temperature water tank through a pipeline, a water outlet of a user end is formed in the joint of the water outlet pipe and the water return pipe, a water return temperature sensor is arranged on the joint of the water return pipe, close to the water outlet pipe, of the water return pipe, and a water return electromagnetic valve for controlling the opening and closing of a hot water return pipeline is arranged on the water return pipe. The utility model well realizes the water supplementing and returning system, the hot water can be used immediately after being opened, and the safety of equipment is ensured.

Description

Hot water intelligent control system based on PLC

Technical Field

The utility model relates to the field of automatic control systems, in particular to a hot water intelligent control system based on a PLC.

Background

Along with the improvement of life quality, people gradually promote the demand of hot water, and the total amount of hot water demand is big in real life, and to the place that needs a large amount of use hot water such as mill, school, hotel, office building, apartment, all need install hot water engineering, because the water demand is big, need long-time heating process, in order to prevent the hot water system trouble and influence the on-time supply of hot water when heating, need arrange personnel to carry out the manual inspection in the heating process, but in-process, receive the influence of factor of labor, often can not send unusually in time. With the development of semiconductor technology, a programmable memory of a PLC has data processing, PID adjustment and data communication functions, and controls various types of machinery or production processes. In order to simplify the control of large-scale equipment, PCL control is used for controlling all links of the equipment at a glance, and the PLC control cabinet has the protection functions of overload, short circuit, phase loss protection and the like. The hot water system works repeatedly through water supplementing, heating and water supplying, and problems occur in each process, so that the whole hot water system stops working and the use of a user is affected. Therefore, the hot water is easy to be suddenly cooled and heated in the water supplementing process, the water temperature is not accurately regulated, the water temperature in the water pipe can be reduced when the tail end is not used for a long time, and the hot water is needed to be discharged for a period of time in the use process, so that time and water waste are caused.

Disclosure of Invention

The technical purpose is that: aiming at the defects of the prior art, the utility model discloses a hot water intelligent control system based on a PLC, which is provided with a constant-temperature water tank, and hot water is stably supplied, so that the temperature is kept within a set range, and a water return device is arranged at a water outlet, so that each water consumption node can realize instant heating when being used.

The technical scheme is as follows: in order to achieve the technical purpose, the utility model adopts the following technical scheme:

the utility model provides a hot water intelligent control system based on PLC, includes PLC controller, constant temperature water tank, cold water pipe, hot-water line, mixed water pipe, cold water pipe, hot-water line meet and insert mixed water pipe, mixed water pipe meet constant temperature water tank, constant temperature water tank one side is provided with the water supply return circuit, the water supply return circuit is including the outlet pipe that is used for supplying water to the user and the wet return that is used for going back to constant temperature water tank with outlet pipe hot water, outlet pipe one end inserts constant temperature water tank, the outlet pipe other end is connected with the wet return, and outlet pipe and wet return junction are provided with the delivery port that supplies the user to use, are provided with backwater temperature sensor in the position that the wet return is close to with outlet pipe junction for detect user's outlet end hot water temperature, be provided with the return solenoid valve that is used for controlling wet return switching on the wet return, backwater temperature sensor, backwater solenoid valve all are connected with the PLC controller electricity.

Further, the cold water pipe and the hot water pipe are provided with adjusting devices for adjusting the relative water inlet proportion of the cold water and the hot water, a water level sensor and a first temperature sensor are arranged in the constant-temperature water tank, a second temperature sensor for detecting the hot water temperature of the mixed water pipe is arranged on the mixed water pipe, and the water level sensor, the first temperature sensor, the second temperature sensor and the adjusting devices are electrically connected with the PLC to adjust the hot water temperature entering the constant-temperature water tank.

Further, the adjusting device is provided with an electromagnetic valve for controlling the opening and closing of the water inlet of the cold water and the hot water according to the pipeline flow direction, and a proportional integral valve for adjusting the water inlet proportion of the cold water and the hot water.

Further, a water pump is arranged at the position, close to the constant-temperature water tank, of the water outlet pipe and is used for automatically pressurizing when the hot water in the pipeline flows.

Further, an auxiliary electric heating tube is arranged in the constant-temperature water tank and used for auxiliary heating when the water temperature of the constant-temperature water tank is reduced, the auxiliary electric heating tube is connected with a power supply, and the auxiliary electric heating tube is electrically connected with the PLC.

Further, be provided with circulating device outside the constant temperature water tank for when supplementary electrothermal tube during operation, constantly circulate hot water heating, circulating device includes circulating water pipe, is equipped with the circulation solenoid valve that is used for controlling circulating water pipe pipeline switching on and off on the circulating water pipe, and constant temperature water tank is inserted to circulating water pipe one end, and mixed water pipe is inserted to the other end, the circulation solenoid valve is connected with the PLC controller electricity.

Further, a water flow switch is arranged at the position, close to the water outlet, of the water outlet pipe and used for controlling the opening and closing of the circulation of the water outlet pipe pipeline, and the water flow switch is electrically connected with the PCL controller.

Further, an anti-dry burning switch for preventing the auxiliary electric heating tube from burning dry is arranged on the outer bottom side of the constant temperature water tank, an anti-overflow switch for preventing water injection of the constant temperature water tank from overflowing is arranged on the outer upper side of the constant temperature water tank, and the anti-overflow switch and the anti-dry burning switch are electrically connected with the PLC.

The beneficial effects are that:

1. according to the intelligent water supplementing device, the electromagnetic valve and the proportional integral valve are arranged on the cold water pipe and the hot water pipe, the intelligent water supplementing process is well realized, the signal is continuously transmitted to the PCL controller through the temperature sensor, the intelligent water supplementing process is completed, the hot water is continuously and stably supplied, the temperature is kept within the set range, and the problem of uneven water temperature in the water supplementing process is solved by the constant-temperature water tank.

2. According to the utility model, the water return device is arranged, the electromagnetic valve is used for controlling the hot water in the water return pipe to return to the water tank, and the constant hot water in the water tank enters the water outlet pipeline, so that the water temperature of the water outlet is kept within the set value, and the instant heating of any water using node is realized.

3. The safety switch is provided with a plurality of safety switches, so that accidents are avoided, and the use safety of equipment is doubly ensured.

Drawings

FIG. 1 is a working block diagram of a hot water intelligent control system based on a PLC;

FIG. 2 is a schematic diagram of a hot water intelligent control system based on a PLC.

In the figure: 1. a PLC controller; 2. a constant temperature water tank; 3. a cold water pipe; 4. a hot water pipe; 5. a mixing water pipe; 6. a water outlet pipe; 7. a water return pipe; 8. a circulating water pipe; 9. a water level sensor; 10. a first temperature sensor; 11. an auxiliary electric heating tube; 12. a second temperature sensor; 13. a hot water solenoid valve; 14. a cold water solenoid valve; 15. a first proportional integral valve; 16. a second proportional-integral valve; 17. a circulation electromagnetic valve; 18. a backwater electromagnetic valve; 19. a backwater temperature sensor; 20. a water pump; 21. a water flow switch; 22. an anti-overflow switch; 23. and (5) a dry-burning prevention switch.

Detailed Description

In order to more clearly describe the technical solution in the embodiments of the present utility model, the technical solution in the embodiments of the present utility model will be clearly and completely described below with reference to the accompanying drawings used in the embodiments of the present utility model.

Referring to fig. 1, a block diagram of a hot water intelligent control system based on a PLC is shown.

The automatic control of hot water supply is carried out by utilizing PLC control, cold water and hot water are mixed and stored in a constant temperature water tank 2 for enabling the temperature of the hot water to be automatically constant, an electromagnetic valve is electrically connected with a PLC controller 1, the opening and the closing of the electromagnetic valve are controlled by the PLC controller 1, a water level sensor and a temperature sensor are arranged, the water level sensor and the temperature sensor are electrically connected with the PLC controller 1, signals are transmitted to the PLC controller 1, the water level sensor and the temperature sensor are continuously adjusted and kept in a water temperature setting range, meanwhile, an electronic touch screen is arranged at the end of the PLC controller 1 and used for obtaining the temperature condition which can be adjusted and the running condition of equipment which can be monitored in real time, and an alarm is arranged, and when the PLC controller 1 detects the abnormal working state, an alarm signal is sent.

Referring to fig. 2, a schematic diagram of a PLC-based hot water intelligent control system is shown.

The utility model provides a hot water intelligent control system based on PLC, including PLC controller 1, constant temperature water tank 2, cold water pipe 3, hot-water line 4, mix water pipe 5, install mix inlet tube 5 on the constant temperature water tank 2, cold water pipe 3, hot-water line 4 meet and get into mix water pipe 5, constant temperature water tank 2 one side is provided with the water supply return circuit, the water supply return circuit is including being used for to the outlet pipe 6 of user's water supply and being used for the wet return 7 of constant temperature water tank 2, outlet pipe 6 one end inserts constant temperature water tank 2, the outlet pipe 6 other end is connected with wet return 7, and wet return 7 inserts constant temperature water tank 2, and outlet pipe 6 is provided with the delivery port that supplies the user to use with the junction of wet return 7, is provided with the return temperature sensor 19 that detects user's outlet end hot water temperature on the position that is close to outlet pipe 6, still is provided with on wet return 7 and is used for controlling the solenoid valve 18 of wet return 7 switching, and water return temperature sensor 19 and solenoid valve 18 all are connected with PLC controller 1 electricity, and water return temperature sensor 19 detects temperature data to transfer PLC controller 1, and the solenoid valve is opened and closed. The water outlet pipe 6 is provided with a water pump 20 for pressurizing the pipeline of the water outlet pipe 6 and a water flow switch 21 for controlling the opening and closing of the hot water.

The mixing water pipe 5 is provided with a second temperature sensor 12 for detecting the temperature of the mixing water, the second temperature sensor 12 is electrically connected with the PLC controller 1, and the PLC controller 1 controls the second temperature sensor 12. The constant temperature water tank 2 is internally provided with a water level sensor 9 for detecting the water level in the water tank, the detected water level is used for supplementing water and limiting water, and the constant temperature water tank 2 is internally provided with a first temperature sensor 10 for detecting the temperature of hot water in the water tank, so as to acquire water temperature regulation data. The constant temperature water tank 2 is internally divided into a high water level line and a low water level line, the PLC controller 1 controls the water level sensor 9 and the first temperature sensor 10, the water level sensor 9 and the first temperature sensor 10 are electrically connected with the PLC controller 1, and the sensors transmit data to the PLC controller 1. The cold water pipe 3 and the hot water pipe 4 are respectively provided with an adjusting device for adjusting the relative proportion of cold water and hot water inflow, the PCL controller is used as a driving device for automatically adding water, the PCL controller receives temperature data sent by the first temperature sensor 10 and the second temperature sensor 12, the adjusting device is electrically connected with the PLC controller 1 and controls the opening and closing of the electromagnetic valve and the opening of the proportional integral valve, the adjusting device comprises an electromagnetic valve for controlling the opening and closing of the cold water and the hot water and a proportional integral valve for adjusting the inflow proportion of the cold water according to the pipeline flow direction, the electromagnetic valve comprises a hot water electromagnetic valve 13 arranged on the hot water pipe 4 and a cold water electromagnetic valve 14 arranged on the cold water pipe 3, and the proportional integral valve comprises a first proportional integral valve 15 arranged on the hot water pipe 4 and a second proportional integral valve 16 arranged on the cold water pipe 3.

A water supplementing device is arranged in a PLC-based hot water intelligent control system, when the water level of a constant-temperature water tank 2 is smaller than a set low water level line, a water level sensor 9 sends a signal to a PLC controller 1, a PCL controller sends an instruction, the system starts water supplementing, hot water is preferentially injected into the water tank, the PLC controller 1 sends the instruction to the end of a hot water pipe 4, when hot water is injected, a first temperature sensor 10 in the constant-temperature water tank 2 continuously detects temperature data, meanwhile, the detected temperature signal is transmitted to the PLC controller 1, the PLC controller 1 continuously compares a temperature detection data value from the inside of the constant-temperature water tank 2 with a constant-temperature value set by the constant-temperature water tank 2 according to actual conditions, and simultaneously continuously outputs signals. When the PLC controller 1 compares that the temperature of the hot water in the constant-temperature water tank 2 is higher than the set temperature value by 0.5 ℃, the PLC controls a transmission signal to the cold water electromagnetic valve 14 to control the cold water electromagnetic valve 14 to be opened, meanwhile, the PLC controller 1 controls the proportional integral valve of the cold water pipe to be opened, the proportional opening of the second integral valve 16 on the cold water pipe 3 is adjusted to be high, the proportional opening of the hot water pipe 4 is adjusted to be low, the comparison is continuously carried out according to the received signal in the constant-temperature water tank 2, and the relative proportional opening of the proportional integral valve of the cold water pipe and the hot water pipe is controlled to be adjusted, so that the hot water temperature is supplemented with hot water according to the set data, and the temperature of the constant-temperature water tank 2 is kept at a constant temperature value. When the first temperature sensor 10 sends a signal to the PLC controller 1, the constant temperature water tank 2 supplements the hot water to reach the system set value, the PLC controller 1 changes the basis mode of proportional integral valve adjustment, the signal detected by the first temperature sensor 10 in the constant temperature water tank 2 is converted to the signal detected by the second temperature sensor 12 on the mixed water pipe 5, the temperature data of the second sensor 12 is continuously compared with the temperature value set by the PLC controller 1, the proportional integral valve of the cold and hot water pipe continuously controls the relative proportion of proportional integral valve adjustment according to the re-received signal, so that the hot water on the mixed water pipe 5 reaches the set temperature requirement, constant hot water is continuously supplemented into the constant temperature water tank 2 until the upper limit of the water level in the constant temperature water tank 2 is reached, water supplement is stopped, and a complete water supplement system is completed.

A water return device is arranged in a hot water intelligent control system based on a PLC (programmable logic controller), a water return pipe 7 is arranged in the control system, one end of the water return pipe 7 is connected to a user end and is communicated with a water outlet pipe 6, the water return pipe 7 is used for controlling cold water return of the water return pipe 7, a water return temperature sensor 19 detects temperature and transmits a temperature data signal to the PLC 1, the PLC 1 is provided with a water return temperature point, when the water temperature in a hot water pipe 4 is lower than a water return set value, the PLC 1 sends out an instruction to control a water return electromagnetic valve 18 to be started, a water pump 20 of a water inlet pipe 6 is started at the same time, water at the user end enters a constant temperature water tank 2 through the water return pipe 7 to be heated, and hot water in the constant temperature water tank 2 enters a hot water supply pipeline; when the water temperature detected by the water return temperature sensor 19 in the water return pipe 7 at the user side is equal to the set value, the PLC controller 1 controls the water return electromagnetic valve 18 to be closed, the water return system detects the temperature through the water return temperature sensor 19, two temperature values can be set, namely an upper limit and a lower limit, the electromagnetic valve is closed when the upper limit is reached, and the electromagnetic valve is opened when the lower limit is reached.

A hot water circulation device is further arranged in the hot water intelligent control system based on the PLC. An auxiliary electric heating pipe 11 is arranged in the constant-temperature water tank 2 and used for reducing the water temperature of the constant-temperature water tank 2, or the water temperature is too low, after the water supplementing process is carried out, when the water temperature requirement cannot be met after hot water is added, heating is carried out, meanwhile, the constant-temperature water tank 2 is externally provided with a circulating device for circulating heating when the hot water temperature of the constant-temperature water tank 2 is low, the circulating device comprises a circulating water pipe 8, one end of the circulating device is connected with the constant-temperature water tank 2, the other end of the circulating device is connected with a mixed water pipe 5, the circulating water pipe 8 is electrically connected with a PLC (programmable logic controller), and the circulating electromagnetic valve 17 is connected with the auxiliary electric heating pipe 11 in the same power supply and is controlled through PCL. The water outlet pipe 6 is provided with a pipeline water pump 20, the pressure change in the pipeline is felt through a pressure switch of the water pump 20, when hot water is used, the pressure is reduced, and when the pressure is lower than a set value, the switch is automatically switched on to start pressurization. In addition, when the auxiliary electric heating tube 11 heats, the PLC controls the water pump 20 and the circulating device to be opened, and hot water is continuously circulated during heating, so that the purpose of uniform hot water is achieved, and the problem of uneven temperature in the water tank is solved.

In order to prevent the water level sensor 9 and the first temperature sensor 10 from generating problems, data cannot be sent to the PLC controller 1, so that accidents caused by overflow during water boiling and water injection occur, a dry-burning prevention switch 23 for preventing the auxiliary heating pipe 11 from burning dry is arranged at the bottom of the outer side of the constant-temperature water tank 2, the dry-burning prevention switch 23 is electrically connected with the PLC controller 1, the PLC controller 1 controls the dry-burning prevention switch 23 to detect whether the water level is lower than the water level where the dry-burning prevention switch 23 is located, and the auxiliary heating pipe 11 stops working when the water level is lower than the water level; an anti-overflow switch 22 for preventing water injection in the water tank from overflowing is arranged above the constant-temperature water tank 2, the anti-overflow switch 22 is electrically connected with the PLC controller 1, and the PLC controller 1 controls the anti-overflow switch 22 to detect whether the water level is higher than the water level of the anti-dry-heating switch 23 or not, and stops working when the water level is higher than the water level of the anti-dry-heating switch 23. The water flow switch 21 is arranged at the position of the water outlet pipe 6 of the user and used for controlling the water outlet to be opened and closed, and when the user uses the hot water, the water flow switch 21 can transmit a stop instruction to the PCL controller, the PLC controller 1 sends out an instruction to control the auxiliary electric heating tube 11 to stop working, and when the hot water is used, the auxiliary electric heating tube 11 is prevented from working suddenly, so that the temperature of the hot water is too high, and the water outlet safety when the hot water is used is ensured.

The foregoing is only a preferred embodiment of the utility model, it being noted that: it will be apparent to those skilled in the art that various modifications and adaptations can be made without departing from the principles of the present utility model, and such modifications and adaptations are intended to be comprehended within the scope of the utility model.

Claims

1. The utility model provides a hot water intelligent control system based on PLC, its characterized in that, including PLC controller (1), constant temperature water tank (2), cold water pipe (3), hot-water line (4), hybrid water pipe (5), cold water pipe (3), hot-water line (4) meet and insert hybrid water pipe (5), hybrid water pipe (5) meet constant temperature water tank (2), constant temperature water tank (2) one side is provided with the water supply return circuit, the water supply return circuit is including being used for to user's outlet pipe (6) that supply water and be used for going back water pipe (7) of constant temperature water tank (2) with outlet pipe (6) hot water, outlet pipe (6) one end access constant temperature water tank (2), the outlet pipe (6) other end is connected with return water pipe (7), return water pipe (7) access constant temperature water tank (2), outlet pipe (6) are provided with the delivery port that supplies the user to use with on the position that return water pipe (6) junction is close to return water temperature sensor (19) for detect user's end hot water temperature, be provided with on return water pipe (7) and be used for controlling return water pipe (7) hot water return valve (18), return water valve (18) switch-off electromagnetic valve (18) and return water controller (1).

2. The PLC-based hot water intelligent control system of claim 1, wherein: the water heater is characterized in that adjusting devices for adjusting the relative water inlet proportion of cold water and hot water are arranged on the cold water pipe (3) and the hot water pipe (4), a water level sensor (9) and a first temperature sensor (10) are arranged in the constant-temperature water tank (2), a second temperature sensor (12) for detecting the hot water temperature of the mixed water pipe (5) is arranged on the mixed water pipe (5), and the water level sensor (9), the first temperature sensor (10), the second temperature sensor and the adjusting devices are electrically connected with the PLC (1) to adjust the hot water temperature entering the constant-temperature water tank (2).

3. The PLC-based hot water intelligent control system of claim 2, wherein: the regulating device is provided with an electromagnetic valve for controlling the opening and closing of the inflow of the cold water and the hot water according to the pipeline flow direction, and a proportional integral valve for regulating the inflow proportion of the cold water and the hot water.

4. The PLC-based hot water intelligent control system of claim 1, wherein: the water outlet pipe (6) is provided with a water pump (20) close to the constant temperature water tank (2) and is used for automatically pressurizing when the hot water flows in the pipeline.

5. The PLC-based hot water intelligent control system of claim 1, wherein: an auxiliary electric heating tube (11) is arranged in the constant-temperature water tank (2) and used for auxiliary heating when the water temperature of the constant-temperature water tank (2) is reduced, the auxiliary electric heating tube (11) is connected with a power supply, and the auxiliary electric heating tube (11) is electrically connected with the PLC (1).

6. The PLC-based hot water intelligent control system of claim 1, wherein: the constant temperature water tank (2) is equipped with circulating device outward for in auxiliary electrothermal tube (11) during operation, constantly circulate hot water heating, circulating device includes circulating water pipe (8), is equipped with on circulating water pipe (8) and is used for controlling circulating water pipe (8) pipeline switching's circulation solenoid valve (17), and constant temperature water tank (2) are inserted to circulating water pipe (8) one end, and mixed water pipe (5) are inserted to the other end, circulating solenoid valve (17) are connected with PLC controller (1) electricity.

7. The PLC-based hot water intelligent control system of claim 1, wherein: the water outlet pipe (6) is provided with a water flow switch (21) at a position close to the water outlet, and the water flow switch (21) is used for controlling the opening and closing of the pipeline circulation of the water outlet pipe (6), and the water flow switch (21) is electrically connected with the PLC (1).

8. The PLC-based hot water intelligent control system of claim 1, wherein: the automatic water injection device is characterized in that an anti-dry heating switch (23) for preventing the auxiliary electric heating tube (11) from being dried is arranged on the outer bottom side of the constant temperature water tank (2), an anti-overflow switch (22) for preventing the water injection of the constant temperature water tank (2) from overflowing is arranged on the outer upper side of the constant temperature water tank (2), and the anti-overflow switch (22) and the anti-dry heating switch (23) are electrically connected with the PLC (1).