Equipment for controlling cold water backflow of water heater

Abstract

The utility model discloses equipment for controlling cold water backflow of a water heater, which comprises a water supply system and a control circuit, a storage type hot water source of the water supply system is connected with water consumption equipment, and a cold water pipe is communicated with a water inlet pipe and a hot water pipe; a control circuit alternating current power supply is connected with a circulating water pump to form a main circuit, a temperature switch, a flow switch and an intermediate relay KA are connected in series to form a temperature control branch, an intelligent switch and a time relay KT are connected in series to form a time control branch, and the time control branch is connected with the temperature control branch in parallel; the temperature switch is connected with the temperature sensor, the flow switch is connected with the flow sensor, and the intelligent switch is connected with the intermediate relay KA, the time relay KT and the temperature switch. Cold water is accurately controlled and circulated when the water heater discharges water based on existing equipment, water resources are effectively saved, compared with existing integrated panel control, the cost is saved by more than 50%, and good practicability and popularization value are achieved.

Description

Technical Field

[0001] The utility model belongs to the technical field of water heaters, in particular to a device for controlling cold water reflux of a water heater. Background Art

[0002] When users use solar energy or hot water systems, they need to drain all the cold water in the water pipes before hot water can be discharged. When the temperature does not reach the set temperature or there is no hot water in the water tank, a large amount of cold water will be discharged, causing a waste of resources. The cold water in the draining process needs to flow back to the water tank to realize the controlled circulation of cold water and avoid waste.

[0003] Currently, there are cold water return devices based on single-chip control panel control on the market, but due to their high cost and the need for relatively skilled technicians in design, programming and debugging, they increase labor costs and are not conducive to promotion and use. Utility Model Content

[0004] In view of the above problems existing in the prior art, the utility model provides a device for controlling the cold water reflux of a water heater. A control circuit is formed based on the existing device to accurately control the circulation of the cold water discharged from the water heater during the draining process to avoid waste.

[0005] To achieve the above-mentioned purpose, the utility model adopts the following technical scheme: a device for controlling cold water reflux of a water heater, a water supply system, comprising a storage-type hot water source, a circulating water pump, a temperature sensor, a flow sensor, a cold water pipe, a hot water pipe and a water inlet pipe, the water inlet end of the storage-type hot water source is connected with the cold water end of the water-using device based on the cold water pipe, the water outlet end is connected with the hot water end of the water-using device based on the hot water pipe, the hot water pipe is provided with a circulating water pump, a temperature sensor and a flow sensor, the cold water pipe is connected with the water inlet pipe and the hot water pipe, and a one-way valve is provided on the water inlet pipe and the hot water pipe;

[0006] And a control circuit, including an AC power supply, a time relay KT, an intelligent switch, a temperature switch, a flow switch and an intermediate relay KA, wherein the AC power supply is connected to a circulating water pump to form a main circuit, the temperature switch, the flow switch and the intermediate relay KA are connected in series to form a temperature control branch, the temperature switch end of the temperature control branch is connected to the live wire of the main circuit, the intermediate relay end is connected to the neutral wire of the main circuit, the intelligent switch and the time relay KT are connected in series to form a time control branch, and the time control branch is connected in parallel with the temperature control branch;

[0007] A circuit breaker and an AC contactor are connected to the main live line. The AC contactor is also connected to a prompt branch including a system operation light. The AC contactor is provided with a 1L1 terminal, a 2T1 terminal, a 21nc terminal, a 22nc terminal, a 4T2 terminal, a 3L2 terminal, an A1 terminal and an A2 terminal. The 1L1 terminal is connected to the main live line, the 2T1 terminal is connected to the circulating water pump, the 21nc terminal is connected to the 4T2 terminal and the main live line, the 22nc terminal is connected to the 3L2 terminal and the A1 terminal, and the A2 terminal is connected to the system operation light;

[0008] The temperature switch is connected to the temperature sensor, the flow switch is connected to the flow sensor, and the intelligent switch is connected to the intermediate relay KA, the time relay KT, and the temperature switch.

[0009] Furthermore, a forced start switch is also provided on the main live line.

[0010] Furthermore, the prompt branch includes a system operation light, a time relay KT1, an intermediate relay KA1 and an AC contactor, and the prompt branch is connected in parallel with the temperature control branch.

[0011] Furthermore, the temperature switch is a normally closed switch. When the detection value of the temperature sensor is within a target range, the temperature switch is turned on. The target range is 60°C-80°C.

[0012] Furthermore, the flow switch is a normally open switch, and when the flow sensor detects water flowing through, the flow switch closes.

[0013] Furthermore, the hot water pipe is connected in sequence with a safety relief valve, a circulating water pump, a temperature sensor and a flow sensor.

[0014] Furthermore, when the circulating water pump is turned off, the one-way valve D1 and the one-way valve D2 balance the pressure of the cold water pipe and the hot water pipe. The one-way valve D1 is arranged on the water inlet pipe, and the one-way valve D2 is arranged on the hot water pipe.

[0015] Beneficial effects of the utility model:

[0016] The present application provides a device for controlling the return flow of cold water from a water heater. Based on the existing equipment, it can realize precise control and circulation of cold water when the water heater is draining water. The device can recycle cold water to a water storage tank through a circulating water pump before reaching a preset temperature, thereby avoiding waste of cold water. The circulating water pump can automatically shut down after the temperature is reached and after a certain period of time after starting to avoid waste, thereby avoiding waste caused by water pump operation and long-term ineffective operation. The device can effectively save water resources and save more than 50% of the cost compared with the existing integrated panel control. It has good practicality and promotion value. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] Figure 1 It is a schematic diagram of the structure of the utility model;

[0018] Figure 2 This is a schematic diagram of the circuit connection of the utility model;

[0019] Figure 3 This is a working schematic diagram of the utility model water supply system when the circulating water pump is not started;

[0020] Figure 4 This is a schematic diagram of the working state of the circulating water pump of the water supply system of the utility model when it is started;

[0021] In the figure, 1-circuit breaker, 2-forced start switch, 3-circulating water pump, 4-system operation light, 5-intelligent switch, 6-temperature switch, 7-flow switch, 8-AC contactor KM1, 9-time relay KT1, 10-time relay KT, 11-intermediate relay KA, 12-intermediate relay KA1, 13-storage hot water source, 14-cold water pipe, 15-hot water pipe, 16-water equipment, 17-check valve D1, 18-check valve D2, 19-temperature sensor, 20-water inlet pipe, 21-flow sensor. DETAILED DESCRIPTION

[0022] The embodiments of the present application will be described in more detail below with reference to the accompanying drawings. Although the embodiments of the present application are shown in the accompanying drawings, it should be understood that the present application can be implemented in various forms and should not be limited by the embodiments described herein. On the contrary, these embodiments are provided to make the present application more thorough and complete, and to fully convey the scope of the present application to those skilled in the art.

[0023] like Figure 1 The device shown for controlling the cold water return of the water heater includes a water supply system and a control circuit, wherein the water supply system includes a storage hot water source 13, a circulating water pump 3, a temperature sensor 19, a flow sensor 21, a cold water pipe 14, a hot water pipe 15 and a water inlet pipe 20; the control circuit includes an AC power supply, a time relay KT10, a forced start switch 2, an intelligent switch 5, a temperature switch 6, a flow switch 7 and an intermediate relay KA11.

[0024] like Figure 2 The control circuit shown includes a main circuit, a time control branch, a temperature control branch and a prompt branch. The AC power supply is connected to the circulating water pump 3 to form the main circuit, the live wire of the AC power supply is connected to the positive electrode of the circulating water pump 3, and the neutral wire of the AC power supply is connected to the negative electrode of the circulating water pump 3. The main live wire is connected with a circuit breaker 1 and an AC contactor 8, and the AC contactor 8 is also connected with a prompt branch. The AC contactor 8 is provided with a 1L1 terminal, a 2T1 terminal, a 21nc terminal, a 22nc terminal, a 4T2 terminal, a 3L2 terminal, an A1 terminal and an A2 terminal. The 1L1 terminal is connected to the main live wire, the 2T1 terminal is connected to the circulating water pump 3, the 21nc terminal is connected to the 4T2 terminal and the main live wire, the 22nc terminal is connected to the 3L2 terminal and the A1 terminal, and the A2 terminal is connected to the system operation light 4.

[0025] The prompt branch includes the system operation light 4, the time relay KT1 9, the intermediate relay KA1 12 and the AC contactor 8. The AC contactor 821nc end of the prompt branch is connected to the main line live wire, and the intermediate relay KA1 128 end is connected to the main line neutral wire. When the AC contactor 8 on the control circuit is turned on, the other side of the AC contactor 8 on the prompt branch will also be turned on. At this time, the system operation light 4 is on, indicating that the system is running, which plays a prompt function.

[0026] The intelligent switch 5 and the time relay KT10 are connected in series to form a time control branch. The intelligent switch 5 end of the time control branch is connected to the AC contactor 822nc end, and the time relay KT10 2 end is connected to the intermediate relay KA1 128 end. The time control branch is used to open and close the circulating water pump 3 based on the opening time. If there is no hot water from the solar energy, after the circulating water pump 3 is started for a certain period of time, even if the preset temperature cannot be reached, the time relay KT10 will act to close the circulating water pump 3 to avoid the circulating water pump 3 from running ineffectively for a long time.

[0027] The temperature switch 6, flow switch 7 and intermediate relay KA11 are connected in series to form a temperature control branch. The temperature switch 6 end of the temperature control branch is connected to the AC contactor 822nc end, and the intermediate relay KA1 124 end is connected to the intermediate relay KA1 128 end. The temperature control branch is used to adjust the opening and closing of the circulating water pump 3 by measuring the hot water temperature.

[0028] like Figure 3 , Figure 4 In the water supply system shown, one end of the cold water pipe 14 is connected to the water inlet end of the storage hot water source 13, and the other end is connected to the cold water end of the water-using equipment 16. One end of the hot water pipe 15 is connected to the water outlet end of the storage hot water source 13, and the other end is connected to the hot water end of the water-using equipment 16. The hot water pipe 15 is connected to the cold water pipe 14 and a check valve D218 is provided at the connecting section. The cold water pipe 14 is also connected to the water inlet pipe 20, and the water inlet pipe 20 is also provided with a check valve D117. The hot water pipe 15 is connected to the safety relief valve, the circulating water pump 3, the temperature sensor 19 and the flow sensor 21 in sequence.

[0029] The temperature switch 6 is connected to the temperature sensor 19. The temperature switch 6 is a normally closed switch. When the detection value of the temperature sensor 19 is in the target range, the temperature switch 6 is turned on. The target range is 60°C-80°C. The flow switch 7 is connected to the flow sensor 21. The flow switch 7 is a normally open switch. When the flow sensor 21 detects that water is flowing through, the flow switch 7 is closed.

[0030] The intelligent switch 5 is connected to the intermediate relay KA11 , the time relay KT10 , and the temperature switch 6 , and can directly open and close the intermediate relay KA11 , the time relay KT10 , and the temperature switch 6 remotely through the intelligent switch 5 .

[0031] When the circulating water pump 3 is turned off and does not start working, the one-way valve D117 and the one-way valve D218 balance the pressure of the cold water pipe 14 and the hot water pipe 15. The one-way valve D117 is set on the water inlet pipe 20, and the one-way valve D218 is set on the hot water pipe 15. When the circulating water pump 3 starts working: because the circulating water pump 3 starts according to the power switch signal, the pressure of D2 is unbalanced, and the water flows from the thermal storage water tank outlet-hot water pipe 15-cold water pipe 14-back to the thermal storage water tank, completing the recycling of cold water.

[0032] When the storage hot water source is draining water, the flow sensor 21 detects the water flow, the flow switch 7 is closed, and the temperature controller detects that the temperature has not reached the set temperature, and controls the circulating water pump 3 to start automatically. After reaching the preset temperature, the temperature switch 6 is turned on, and the circulating water pump 3 is automatically shut down. If there is no hot water in the storage hot water source, after the circulating water pump 3 is started for a certain period of time, even if the preset temperature cannot be reached, the time relay KT10 will be activated to shut down the circulating water pump 3 to prevent the circulating water pump 3 from running ineffectively for a long time.

[0033] The units described as separate components may or may not be physically separated, and the components shown as units may or may not be physical units, that is, they may be located in one place or distributed on multiple network units. Some or all of the units may be selected according to actual needs to achieve the purpose of the solution of this embodiment.

[0034] The embodiments of the present application have been described above, and the above description is exemplary, not exhaustive, and is not limited to the disclosed embodiments. Many modifications and changes will be apparent to those of ordinary skill in the art without departing from the scope and spirit of the described embodiments. The selection of terms used herein is intended to best explain the principles of the embodiments, practical applications, or improvements to the technology in the market, or to enable other persons of ordinary skill in the art to understand the embodiments disclosed herein.

Claims

1. A device for controlling cold water reflux of a water heater, characterized in that: include: A water supply system, comprising a storage-type hot water source, a circulating water pump, a temperature sensor, a flow sensor, a cold water pipe, a hot water pipe and a water inlet pipe, wherein the water inlet end of the storage-type hot water source is connected to the cold water end of the water-using equipment based on the cold water pipe, and the water outlet end is connected to the hot water end of the water-using equipment based on the hot water pipe, the circulating water pump, the temperature sensor and the flow sensor are arranged on the hot water pipe, the cold water pipe is connected to the water inlet pipe and the hot water pipe, and the water inlet pipe and the hot water pipe are both provided with a one-way valve; And a control circuit, including an AC power supply, a time relay KT, an intelligent switch, a temperature switch, a flow switch and an intermediate relay KA, wherein the AC power supply is connected to the circulating water pump to form a main circuit, the temperature switch, the flow switch and the intermediate relay KA are connected in series to form a temperature control branch, the temperature switch end of the temperature control branch is connected to the live wire of the main circuit, the intermediate relay end is connected to the neutral wire of the main circuit, the intelligent switch and the time relay KT are connected in series to form a time control branch, and the time control branch is connected in parallel with the temperature control branch; The main live line is connected with a circuit breaker and an AC contactor, and the AC contactor is also connected with a prompt branch including a system operation light. The AC contactor is provided with a 1L1 terminal, a 2T1 terminal, a 21nc terminal, a 22nc terminal, a 4T2 terminal, a 3L2 terminal, an A1 terminal and an A2 terminal. The 1L1 terminal is connected to the main live line, the 2T1 terminal is connected to the circulating water pump, the 21nc terminal is connected to the 4T2 terminal and the main live line, the 22nc terminal is connected to the 3L2 terminal and the A1 terminal, and the A2 terminal is connected to the system operation light; The temperature switch is connected to the temperature sensor, the flow switch is connected to the flow sensor, and the intelligent switch is connected to the intermediate relay KA, the time relay KT, and the temperature switch.

2. The device according to claim 1, characterized in that A forced start switch is also provided on the main live line.

3. The device according to claim 1, characterized in that The prompt branch includes the system operation light, the time relay KT1, the intermediate relay KA1 and the AC contactor, and the prompt branch is connected in parallel with the temperature control branch.

4. The device according to claim 1, characterized in that The temperature switch is a normally closed switch. When the detection value of the temperature sensor is within a target range, the temperature switch is turned on. The target range is 60°C-80°C.

5. The device according to claim 1, characterized in that The flow switch is a normally open switch, and when the flow sensor detects water flowing through, the flow switch is closed.

6. The device according to claim 1, characterized in that The hot water pipe is connected in sequence with a safety relief valve, the circulating water pump, the temperature sensor and the flow sensor.

7. The device according to claim 1, characterized in that When the circulating water pump is turned off, the one-way valve D1 and the one-way valve D2 balance the pressure between the cold water pipe and the hot water pipe. The one-way valve D1 is arranged on the water inlet pipe, and the one-way valve D2 is arranged on the hot water pipe.

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