Stable heating device for domestic water

Abstract

The utility model discloses a stable heating device for domestic water. The stable heating device comprises a domestic water tank and a temperature and time dual-control system, the temperature and time dual-control system comprises a temperature control loop and a time control circuit, and the temperature control loop collects temperature signals in the domestic water tank through a thermal resistor, controls on and off of a heater through a temperature control switch and controls the water temperature in the domestic water tank; the time control circuit is connected in the temperature control loop in series and comprises a time control switch and a time relay, and operation of the heater is controlled through the time relay and the temperature control switch by setting the operation time period of the heater; accurate control over the heater can be achieved, and unnecessary operation time is shortened. And meanwhile, the U-shaped pipeline is additionally arranged to serve as a safety protection measure, the dry burning phenomenon of the heater is effectively prevented, the safety and reliability of the system are further improved, and wide application prospects and remarkable practical value are achieved.

Description

Technical Field

[0001] This utility model relates to the field of domestic water heating technology, and in particular to a stable heating device for domestic water. Background Technology

[0002] Currently, the canteen's domestic water heating primarily utilizes a steam heating system. This system collects temperature signals by installing a thermal resistor on the water tank and transmits these signals to a temperature control switch in the control cabinet. When the water temperature drops to the set lower limit, the temperature control switch automatically opens the steam valve, allowing steam to enter the water tank for heating; conversely, when the water temperature reaches the set upper limit, the temperature control switch closes the steam valve, stopping the heating process. This steam-based heating method met the canteen's domestic water heating needs for a period of time.

[0003] As the company places increasing emphasis on cost control and demands higher energy efficiency, the limitations of steam heating have become increasingly apparent. To reduce energy consumption and operating costs, the company plans to replace the steam heating system with electric heaters. However, initial trials using electric heaters and the existing control methods revealed some significant drawbacks.

[0004] Especially during off-peak mealtimes, the water temperature fluctuation range may become narrower due to a significant reduction in water consumption. If the original temperature-limit-based control method is still used, the electric heater will immediately start and continue heating when the water temperature drops to the lower limit until the water temperature reaches the upper limit.

[0005] This frequent heating and stopping process not only increases the workload of the electric heater but may also accelerate its aging process, thus shortening its service life. Furthermore, prolonged continuous heating can cause the electric heater to overheat, further increasing the risk of it burning out. Utility Model Content

[0006] The problem this utility model aims to solve is to provide a stable heating device for domestic water, which adds a time control switch to the traditional temperature control logic and sets it in combination with specific operating periods to achieve precise control of the heater, thereby improving the service life and energy efficiency of the electric heater.

[0007] This utility model adopts the following technical solution: a domestic water stable heating device, comprising: a domestic water tank and a dual temperature and time control system;

[0008] Domestic water tanks are used to store hot water;

[0009] A dual temperature and time control system, comprising: a temperature control loop and a time control circuit;

[0010] The temperature control loop collects the temperature signal inside the domestic water tank through a thermal resistor and controls the opening and closing of the heater through a temperature control switch to control the water temperature inside the domestic water tank.

[0011] The time control circuit, connected in series in the temperature control loop, includes a time switch and a time relay. By setting the operating period of the heater, the time relay and the temperature control switch jointly control the operation of the heater.

[0012] Furthermore, the temperature control circuit includes: a temperature control switch, a resistance temperature detector (RTD), a heater, a main contactor, and a coil; wherein, the heater is connected to the main power switch through the main contactor, and when the coil of the main contactor is energized, the contacts close and the heater starts to work; the temperature control switch controls the heater according to the water temperature in the domestic water tank.

[0013] Furthermore, a time relay is connected in series between the temperature control switch and the heater, and together with the temperature control switch, controls the working state of the heater.

[0014] Preferably, the time control switch is equipped with three operating periods, each corresponding to a period before three meals, to ensure that the water temperature in the domestic water tank reaches the preset range before mealtimes.

[0015] The preferred temperature and time dual control system has the following control logic:

[0016] When the water temperature in the domestic water tank reaches the set lower limit temperature, and the current time is within the time period set by the time control switch, the power supply of the temperature control circuit is turned on, the main contactor coil is energized, and the heater starts to operate.

[0017] When the water temperature in the domestic water tank reaches the set upper limit temperature, the temperature control switch is turned off, and the heater stops operating.

[0018] Preferably, the heating device also includes a safety protection circuit, which changes the water flow path and height difference by setting a U-shaped pipe on the outlet pipe of the domestic water tank, so that the water level in the water tank is always higher than the position of the heater, thus preventing the heater from burning dry.

[0019] Preferably, the heating device further includes a digital display temperature controller connected between the time control switch and the time relay, used to display real-time temperature and control information, and as the input signal source for the temperature controller.

[0020] Compared with the prior art, the present invention, by adopting the above technical solution, has the following technical effects:

[0021] This invention relates to a stable heating device for domestic water, which enables precise control of the heater, reducing unnecessary operating time, thereby extending equipment lifespan and lowering maintenance costs. Simultaneously, by setting specific operating periods, it ensures that the water temperature reaches a suitable range before mealtimes, improving user satisfaction and comfort. Furthermore, the addition of a U-shaped pipe as a safety protection measure effectively prevents the heater from dry-burning, further enhancing the system's safety and reliability. Attached Figure Description

[0022] Figure 1 This is a circuit diagram of the domestic water stable heating device of this utility model. Detailed Implementation

[0023] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the protection scope of the present utility model.

[0024] The present invention provides a stable heating device for domestic water, comprising: a domestic water tank and a dual temperature and time control system, wherein the domestic water tank is used to store hot water.

[0025] A dual temperature and time control system, comprising: a temperature control loop and a time control circuit;

[0026] The temperature control circuit includes: a temperature control switch, a resistance temperature detector (RTD), a heater, a main contactor, and a coil. The temperature control circuit collects the temperature signal inside the domestic water tank through the RTD and controls the opening and closing of the heater through the temperature control switch to control the water temperature inside the domestic water tank.

[0027] The time control circuit, connected in series in the temperature control loop, includes a time switch and a time relay. By setting the operating period of the heater, the time relay and the temperature control switch jointly control the operation of the heater.

[0028] Specifically, in the first embodiment of the present invention, as Figure 1 As shown, L1, L2, and L3 represent three-phase power inputs, which provide power to the entire system.

[0029] QF1 is the main power switch, responsible for turning the temperature and time dual control system on and off. QF2 is a special temperature controller that controls the heater's on and off based on the water temperature in the tank.

[0030] Specifically, the circuit in this embodiment includes a time relay RT, which is connected in series with the temperature controller QF2 to jointly determine the operating time of the heater, forming an intelligent control system with dual temperature and time control.

[0031] The time relay RT can be set to multiple operating segments according to actual needs, ensuring that the heater is started in advance a period of time before meals, so that the water temperature gradually rises to a suitable range.

[0032] The circuit also includes a digital display temperature controller, connected in series between the time switch and the time relay RT, used to display the water temperature in real time and serve as the input signal source for the temperature controller QF2.

[0033] In use, heater H is connected to the power supply through main contactor KM. When the coil of main contactor KM is energized, its contacts close and heater H starts to work.

[0034] When the water temperature in the domestic water tank drops to the set lower limit temperature, and the current time is within the operating period set by the time relay RT, the temperature controller QF2 and the time relay RT simultaneously output a closing signal. This closing signal is transmitted to the main contactor KM, energizing its coil and closing its contacts, thereby connecting the power supply to the heater and starting the heater to work.

[0035] During operation, if the water temperature in the domestic water tank reaches the set upper limit temperature, the temperature controller QF2 will immediately disconnect the output signal, and the heater will stop working even if it is still within the set time period of the time relay RT. This design ensures stable water temperature and avoids unnecessary energy waste.

[0036] Specifically, to prevent the heater from burning dry, this embodiment also includes a U-shaped pipe on the outlet pipe of the domestic water tank to ensure that the water level in the tank is always higher than the heater's installation position. This safety protection measure further improves the system's reliability and safety.

[0037] In summary, the domestic water stable heating device provided by this utility model, combined with specific operating period settings, achieves stable heating of domestic water through dual control of temperature and time, thereby reducing equipment operating time, extending equipment lifespan, and ensuring that the water temperature remains stable within the set time period. It has broad application prospects and significant practical value.

[0038] The above description is only a preferred embodiment of the present utility model. It should be noted that for those skilled in the art, several improvements and modifications can be made without departing from the principle of the present utility model, and these improvements and modifications should also be considered within the protection scope of the present utility model.

Claims

1. A domestic hot water stable heating device, characterized in that, include: Domestic water tank and dual temperature and time control system; The domestic water tank is used to store hot water; The temperature and time dual control system includes: a temperature control loop and a time control circuit; The temperature control loop collects the temperature signal inside the domestic water tank through a thermal resistor and controls the opening and closing of the heater through a temperature control switch to control the water temperature inside the domestic water tank. The time control circuit, connected in series in the temperature control loop, includes a time control switch and a time relay. By setting the operating period of the heater, the time relay and the temperature control switch jointly control the operation of the heater.

2. The domestic water stabilization heating device according to claim 1, characterized in that, The temperature control circuit includes: a temperature control switch, a thermal resistor, a heater, a main contactor, and a coil; the heater is connected to the main power switch through the main contactor, and the contacts close when the coil of the main contactor is energized, and the heater operates; the temperature control switch controls the heater according to the water temperature in the domestic water tank.

3. The domestic water stabilization heating device according to claim 2, characterized in that, The time relay is connected in series between the temperature control switch and the heater, and together with the temperature control switch, controls the working state of the heater.

4. The domestic water stabilization heating device according to claim 3, characterized in that, The time control switch is equipped with three operating periods, each corresponding to the period before three meals, to ensure that the water temperature in the domestic water tank reaches the preset range before mealtimes.

5. The domestic water stabilization heating device according to claim 4, characterized in that, The control logic of the dual temperature and time control system is as follows: When the water temperature in the domestic water tank reaches the set lower limit temperature, and the current time is within the time period set by the time control switch, the power supply of the temperature control circuit is turned on, the main contactor coil is energized, and the heater starts to operate. When the water temperature in the domestic water tank reaches the set upper limit temperature, the temperature control switch is turned off, and the heater stops operating.

6. The domestic water stabilization heating device according to claim 1, characterized in that, The heating device also includes a safety protection circuit. By setting a U-shaped pipe on the outlet pipe of the domestic water tank, the water flow path and height difference are changed, so that the water level in the tank is always higher than the heater position, preventing the heater from burning dry.

7. The domestic water stabilization heating device according to claim 1, characterized in that, The heating device also includes a digital display temperature controller, connected between the time switch and the time relay, used to display real-time temperature and control information, and as the input signal source for the temperature controller.

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