CN206803504U - Natural Gas Water Heater return water system - Google Patents

Abstract

The utility model provides a water return system for a natural gas water heater, which comprises a temperature sensing device, a two-position three-way electromagnetic reversing valve, a controller, a water pump and a water return pipe. The temperature sensing device is located on the outlet pipe of the water heater near the faucet, and is used to detect the water temperature of the outlet pipe of the water heater and to control the return of the water in the outlet pipe of the water heater to the return pipe when the water temperature in the outlet pipe of the water heater is lower than the preset temperature; The electromagnetic reversing valve is located between the temperature sensing device on the outlet pipe of the water heater and the faucet, the first one is connected with the outlet pipe of the water heater, and the second one can be connected with the faucet or the return pipe; the impeller installed on the return pipe can remind the user that the water temperature is insufficient is backwatering. The one-way valve installed on the water inlet pipe of the water heater can prevent the water in the return pipe from flowing back to the tap water pipe after the water pump starts. Each faucet is equipped with a separate temperature sensing device and a two-position three-way electromagnetic reversing valve to ensure that the outlet water temperature of each faucet is appropriate. The utility model has reasonable design and strong practicability.

Description

Natural gas water heater return system

technical field

The utility model relates to the field of water heaters, in particular to a water heater return system.

Background technique

When the current household natural gas water heater is in use, the cold water in the water pipe between the water heater and the water tap must be drained before the hot water flows out slowly, which wastes a lot of water resources. Especially in winter, if you turn off the shower when using shower gel, cold water will flow out when you turn it on again, which will seriously affect the comfort. If you don't turn it off, it will waste water resources. In order to solve this problem, the Chinese invention patent with the notification number CN103162414B discloses a "water heater and its return water system and control method", but the temperature sensing device and the three-way valve of the return water system are arranged on the return water pipe. The temperature sensing device cannot sense the temperature of the outlet pipe of the water heater in time and can only sense the temperature of the remaining water in the return pipe. When the temperature of the outlet pipe is suitable and the water temperature in the return pipe is low, the return device will be activated, resulting in hot water and The waste of energy will also cause intermittent water flow at the water supply end, affecting the bathing experience; and if the water heater has multiple water supply ends, the three-way valve can only act on the water supply end at the end, and the water supply ends at the front position are still There will be cold water.

Utility model content

In order to overcome the defects in the prior art that the return water system cannot sense the temperature of the outlet pipe of the water heater in time and can only sense the temperature of the remaining water in the return pipe and the three-way valve can only act on the water supply end at the end, the utility model provides a natural gas water heater For the return water system, a temperature sensing device and a two-position three-way electromagnetic reversing valve are installed on the outlet pipe of the water heater near the faucet, and each faucet is equipped with a temperature sensing device and a two-position three-way electromagnetic reversing valve to overcome the current situation. There are technical flaws.

The technical scheme adopted by the utility model to solve the technical problem is: a natural gas water heater return water system, including a temperature sensing device, a two-position three-way electromagnetic reversing valve, a controller, a water pump, and a return pipe. The water pump is located in the return pipe. On the end close to the water inlet pipe of the water heater, the controller is respectively connected with the water pump, the temperature sensing device and the two-position three-way electromagnetic reversing valve. Between the temperature sensing device on the water outlet pipe and the faucet, the first place is connected with the water heater outlet pipe, and the second place can be connected with the water faucet or the water return pipe.

The above natural gas water heater return system further includes an impeller, and the impeller is located on the return pipe.

The above natural gas water heater return system further includes a one-way valve and a stop valve, the stop valve is located on the water heater inlet pipe, and the one-way valve is located between the stop valve and the water heater.

In the above natural gas water heater return system, the controller also includes an operation panel, on which two temperature values can be set, one is the lowest temperature value of the hot water from the faucet, called the first temperature value, and the other is the temperature value of the faucet. The value that decreases relative to the first temperature value when the hot water is stopped is called the second temperature value.

The above natural gas water heater return system further includes a controller switch, and the controller switch is located on the hot water switch of the faucet switch.

In the above-mentioned natural gas water heater backwater system, multiple faucets can be installed, and each faucet has an independent two-position three-way electromagnetic reversing valve, a temperature sensing device and an impeller, and a common return pipe.

The beneficial effect of the utility model is that the water heater return system of the utility model adopts the method of setting the temperature sensing device and the two-position three-way electromagnetic reversing valve on the outlet pipe of the water heater close to the end of the faucet to sense the water temperature of the faucet in time. If the temperature does not reach the set temperature, the faucet will not emit water, and the water flow will circulate between the hot water pipe, the return pipe and the water heater. After the water temperature reaches the first temperature value, the faucet will automatically discharge water, and the water temperature will automatically stop when the water temperature drops to the second temperature value. . The impeller installed on the return pipe can rotate when the water in the return pipe flows, thereby prompting the user that the water temperature is insufficient and the return water system is returning water. The one-way valve installed on the water heater inlet pipe can be used to prevent the water in the return pipe from flowing to the cold water pipe after the water pump is started. Each faucet is equipped with a separate temperature sensing device and a two-position three-way electromagnetic reversing valve to ensure that the outlet water temperature of each faucet is appropriate.

Description of drawings

Below in conjunction with accompanying drawing and embodiment the utility model is further described.

Fig. 1 is the principle diagram of this new type of use;

Fig. 2 is a schematic diagram of the faucet switch of the present invention.

In the figure 1. water heater, 2. temperature sensing device, 3. two-position three-way electromagnetic reversing valve, 4. water pump, 5. controller, 6. water heater outlet pipe, 7. return pipe, 8. impeller, 9. faucet Switch, 10. Water heater inlet pipe, 11. One-way valve, 12. Stop valve, 13. Water pipe, 14. Water faucet, 15. Controller switch.

detailed description

【Example 1】

A water return system for a natural gas water heater, comprising a temperature sensing device 2, a two-position three-way electromagnetic reversing valve 3, a controller 5, a water pump 4, and a water return pipe 7. The temperature sensing device 2 is located at the end of the water heater outlet pipe 6 close to the faucet 14, and is used to detect the water temperature in the water heater outlet pipe 6 at the faucet 14 and to control the water temperature in the water heater outlet pipe 6 when the water temperature in the water heater outlet pipe 6 is lower than the preset temperature. The water returns to the return pipe 7; the two-position three-way electromagnetic reversing valve 3 is located between the temperature sensing device 2 on the water heater outlet pipe 6 and the faucet 14, the first one is connected with the water heater outlet pipe 6, and the second one can be connected with the water faucet 14 Or the return pipe 7 is connected. When the water temperature reaches the set temperature, the second position of the two-position three-way electromagnetic reversing valve 3 is connected with the faucet 14. The faucet 14 starts to provide hot water. When the water temperature does not reach the set temperature, the two-position three-way The second position of the electromagnetic reversing valve 3 is connected with the return pipe 7, and the cold water flows back into the return pipe 7; the controller 5 is connected with the water pump 4, the temperature sensing device 2 and the two-position three-way electromagnetic reversing valve 3 respectively, for When the water temperature in the outlet pipe 6 of the water heater is lower than the preset temperature, control the two-position three-way electromagnetic reversing valve 3 so that the outlet pipe 6 of the water heater communicates with the return pipe 7, and control the water pump 4 to pass the cold water in the outlet pipe 6 of the water heater through the return pipe 7 Pump back to the water heater inlet pipe 10; the water pump 4 is located on the return pipe 7 near the end of the water heater inlet pipe 10.

When in use, set the temperature of the water heater 1 as t, the first temperature value of the operation panel of the controller 5 is t1, and it is required that t≥t1. The second temperature value is Δt1, and the maximum value of Δt1 is 10°. Turn on the faucet switch 9 and turn on the controller switch 15 at the same time, the temperature sensing device 2 detects that the water temperature is lower than t1-Δt1, the two-position three-way electromagnetic reversing valve 3 is energized, and the water heater outlet pipe 6 is connected to the return water pipe 7 for 0.5s After 1 second, the water pump 4 is started, and the water flow is promoted to circulate between the water heater outlet pipe 6 , the water return pipe 7 and the water heater 1 . When the temperature sensing device 2 detects that the water temperature reaches t1, the controller de-energizes the two-position three-way electromagnetic reversing valve 3, and the outlet pipe 6 of the water heater communicates with the faucet 14, and the faucet 14 starts to produce hot water at this time.

[Example 2]

The difference between Embodiment 2 and Embodiment 1 is that the above natural gas water heater return water system may further include an impeller 8, the impeller 8 is located on the return pipe 7, and when the water in the return pipe 7 flows, the impeller 8 rotates to remind the user of the water temperature. Insufficient backwater The system is backwatering. At the same time, it can also include a one-way valve 11 and a stop valve 12, the stop valve 12 is located on the water heater inlet pipe 10, the one-way valve 11 is located between the water heater 1 and the stop valve 12, and the one-way valve 11 effectively prevents the water from running away. Out of the circulation circle, if the return pipe 7 has a cut-off, the water heater inlet pipe 10 will automatically replenish the water yield through the tap water pipe 13 and the one-way valve 11, and now the faucet 14 does not produce water. The controller 5 can also include an operation panel, on which two temperature values can be set, one is the lowest temperature value of hot water from the faucet 14, which is called the first temperature value, and the other is when the faucet 14 stops dispensing hot water. The value that decreases relative to the first temperature value is called the second temperature value. The natural gas water heater backwater system may also include a controller switch 15 for controlling the start and stop of the controller 5 , and the controller switch 15 is located on the hot water switch of the faucet switch 9 .

[Example 3]

The difference between Embodiment 3 and Embodiment 1 or Embodiment 2 is that there may be multiple faucets 14, and each faucet 14 has an independent two-position three-way electromagnetic reversing valve 3, a temperature sensing device 2 and an impeller. 8. Shared return pipe 7.

Claims (6)

1. A natural gas water heater water return system, comprising a temperature sensing device, a two-position three-way electromagnetic reversing valve, a controller, a water pump, and a water return pipe. , the temperature sensing device and the two-position three-way electromagnetic reversing valve are connected separately, and it is characterized in that the temperature sensing device is located on the outlet pipe of the water heater close to the end of the faucet, and the two-position three-way electromagnetic reversing valve is located on the water heater outlet pipe of the temperature sensing device and the faucet Between, the first one is connected with the outlet pipe of the water heater, and the second one can be connected with the faucet or the return pipe. 2. The natural gas water heater return water system according to claim 1, further comprising an impeller, and the impeller is located on the return pipe. 3. A natural gas water heater return water system according to claim 2, characterized in that it further comprises a check valve and a shut-off valve, the shut-off valve is located on the water heater inlet pipe, and the check valve is located between the shut-off valve and the water heater. between. 4. A natural gas water heater return water system according to claim 3, characterized in that the controller also includes an operation panel on which two temperature values can be set, one is the lowest temperature of hot water from the faucet The value is called the first temperature value, and the other is the value that decreases relative to the first temperature value when the faucet stops dispensing hot water, which is called the second temperature value. 5 . The natural gas water heater return water system according to claim 4 , further comprising a controller switch, the controller switch being located on the hot water switch of the faucet switch. 6 . 6. A natural gas water heater return water system according to claim 1 or 5, characterized in that there can be multiple faucets, and each faucet has an independent two-position three-way electromagnetic reversing valve and a temperature sensing device and the impeller share the return pipe.