A strong exhaust type gas water heater
By introducing control systems such as water flow sensors and electronic water valves into the water heater, the problems of water leakage, automatic restart, dry burning, and high water pressure have been solved, ensuring the safety and stability of the water heater. This ensures that it will not automatically restart and dry burn in the event of a water leak, and will work normally under high water pressure, thus protecting user safety.
Patent Information
- Authority / Receiving Office
- CN · China
- Patent Type
- Patents(China)
- Current Assignee / Owner
- 秦茂林
- Filing Date
- 2024-01-26
- Publication Date
- 2026-07-24
AI Technical Summary
Existing forced draft gas water heaters are prone to self-starting and dry burning when there is a leak in the faucet or hot water pipe, which can lead to safety hazards and damage the water heater. They also cannot work properly or automatically shut down under high water pressure.
A water flow sensor and electronic water valve are installed on the hot water pipe. Combined with the controller, the exhaust system, water supply system, circulation system and flame sensor are controlled to ensure that the water heater does not start automatically in case of water leakage, works stably under high water pressure, and reduces the residual heat in the water tank after shutdown to prevent scalding.
It effectively prevents the water heater from dry burning in case of leakage, ensures normal operation under high water pressure, protects the water heater from damage, and avoids scalding for users, thus improving the safety and applicability of the water heater.
Smart Images
Figure CN117781478B_ABST
Abstract
Description
Technical Field
[0001] This invention relates to the field of gas water heater technology, specifically to a forced draft gas water heater. Background Technology
[0002] Forced-draft water heaters use an exceptionally long heat transfer tube and a heat exchanger with a large metal contact area to fully transfer the heat from the combustion gases to the metal plates to heat the water, resulting in extremely low exhaust gas temperatures. This heat exchanger has extremely high thermal efficiency. Forced-draft water heaters are based on flue-type heaters but add a flue gas exhaust motor. Exhaust gases are forced outdoors through a flue. During operation, the flue gas is forcibly exhausted outdoors through the flue, but the oxygen required for combustion is still drawn from indoors.
[0003] Chinese patent document CN110108025B discloses a zero-cold-water forced-draft gas water heater, including a housing, a combustion chamber and a flue gas exhaust mechanism disposed within the housing. The flue gas exhaust mechanism has a flue gas pipe extending upward from the housing. A gas intake pipe, a cold water pipe, a hot water pipe and a controller are disposed at the lower part of the combustion chamber. An electronic water valve and a pressure power switch are installed at the outlet end of the hot water pipe. The pressure power switch automatically disconnects the power when the water pressure increases and automatically connects the power when the water pressure decreases. The electronic water valve is located in front of the pressure power switch. The electronic water valve is synchronously linked with the gas valve on the gas intake pipe and is controlled by a pulse signal built into the controller.
[0004] The existing technology has the following shortcomings: The working principle of a forced draft water heater is that the water heater stops working when the water pressure rises and starts working when the water pressure drops. If the water heater faucet or hot water pipe leaks, the existing forced draft gas water heater will automatically start ignition and dry-burn, which poses a safety hazard and will also damage the water heater. Summary of the Invention
[0005] This invention addresses the technical problem of automatic restart after a leak in the faucet or hot water pipe of a zero-cold-water forced-draft gas water heater. It provides a forced-draft gas water heater comprising a flue system, a water tank, a combustion chamber, a controller, a gas valve, a gas pipe, a cold water pipe, and a hot water pipe. The hot water pipe is equipped with an electronic water valve and a pressure switch. The controller controls the electronic water valve and the flue system. The invention is characterized by a water flow sensor located between the electronic water valve and the pressure switch. The water flow sensor is connected to the controller. After the outlet of the cold water pipe is opened, the controller receives a pressure reduction signal and controls the flue system to start. The electronic water valve opens after a delay of 3-8 seconds. The water heater ignites after the controller receives a water flow signal from the water flow sensor.
[0006] Furthermore, to prevent abnormal pressure loss from causing the water heater to automatically restart or prevent the user from turning it on the next time, a water replenishment system is installed on the hot water pipe. This system connects to both the electronic water valve and the water flow sensor, and is also connected to the controller. The water replenishment system activates 3-4 seconds after the controller receives a signal to activate the exhaust system, and it shuts off synchronously with the exhaust system. Continuous leakage will cause repeated pressure changes, leading to repeated activation and deactivation of the exhaust system, reminding the user to promptly inspect and repair any leaks at the water outlet or hot water end.
[0007] Preferably, the water replenishment system includes a water replenishment pipe and a water replenishment valve. The water replenishment pipe is installed on the hot water pipe. The water replenishment pipe crosses both the electronic water valve and the water flow sensor. One end of the water replenishment pipe is located above the electronic water valve, and the other end is located below the water flow sensor. The water replenishment valve is installed on the water replenishment pipe and is connected to the controller. After the controller receives a signal to start the exhaust system, the water replenishment valve opens within 3-4 seconds and closes synchronously with the exhaust system.
[0008] To prevent water heaters from failing to start or automatically shutting down due to excessively high water pressure in various regions, if the water pressure exceeds the design range of the pressure switch and the water flow at the outlet is less than the flow rate through the electronic water valve, the pressure switch will automatically shut off. After receiving a water flow signal, the controller activates a forced switch, which in turn activates the pressure switch. The controller then controls the electronic water valve and gas valve to open. Once there is no water flow signal, the forced switch is deactivated.
[0009] To prevent scalding from residual heat in the water tank after the water heater is turned off and then on again, a circulation system is installed on the hot water pipe near the water tank and between it and the cold water pipe. This circulation system is connected to the controller and starts and stops synchronously with the exhaust system. During operation, the circulation system disconnects when the controller receives a water flow signal and restarts when it receives a no-water-flow signal. Each time the water heater is turned on and off, the residual heat in the water tank mixes with the cold water in the cold water tank, dispersing and cooling the water.
[0010] Preferably, the circulation system includes a cold water tank, a circulation pipeline, and a circulation pump. The cold water tank is installed on the cold water pipeline. One end of the circulation pipeline is connected to the upper part of the electronic water valve near the water tank, and the other end is connected to the cold water tank. The circulation pump is installed in the middle of the circulation pipeline. The circulation pump is connected to the controller. The circulation pump starts and stops synchronously with the smoke exhaust system. During this period, when the controller receives a flow signal, the circulation pump is disconnected; when the controller receives a no-flow signal, the circulation pump starts.
[0011] To protect the water heater, a flame sensor is installed in the combustion chamber. The flame sensor is connected to the controller. When the controller receives a water flow signal, the flame sensor is activated; when the controller does not receive a water flow signal, the flame sensor is deactivated, and the water heater automatically shuts off.
[0012] The present invention has the following beneficial effects: 1. High safety of water heater: The water heater will not dry-burn when there is a leak in the hot water pipe or faucet; it also solves the problem of the water heater spontaneously combusting or failing to start when the user turns on the faucet and then quickly turns it off; it can also prevent users from being scalded by boiling water again.
[0013] 2. Suitable for high water pressure environments: By using the water supply valve to maintain the constant pressure in the pipeline at the pressure switch, it avoids situations where the water pressure in some areas exceeds the design range of the pressure switch. Under normal working conditions, when the water outlet and electronic water valve of the water heater are open, the water flow at the outlet is less than the water flow at the electronic water valve, resulting in high pressure in the hot water pipeline, which may cause the water heater to automatically shut off or fail to start. Attached Figure Description
[0014] Figure 1 This is a schematic diagram of an embodiment of the forced draft gas water heater of the present invention. Detailed Implementation
[0015] The following detailed description illustrates the specific implementation method: 1. The reference numerals in the accompanying drawings of the instruction manual include: 1. Smoke exhaust system; 2. Water tank; 3. Combustion chamber; 4. Controller; 5. Gas valve; 6. Gas pipeline; 7. Cold water pipeline; 8. Hot water pipeline; 9. Electronic water valve; 10. Pressure switch; 11. Water flow sensor; 12. Water outlet; 13. Water supply pipeline; 14. Water supply valve; 15. Cold water tank; 16. Circulation pipeline; 17. Circulation pump; 18. Flame sensor needle; 19. Forced switch.
[0016] Example 1 like Figure 1As shown, a forced draft gas water heater includes a casing, a flue system 1, a water tank 2, a combustion chamber 3, a controller 4, a gas valve 5, a gas pipe 6, a cold water pipe 7, and a hot water pipe 8. The hot water pipe 8 is equipped with an electronic water valve 9 and a pressure switch 10. The controller 4 controls the electronic water valve 9 and the flue system 1. The key feature is that a water flow sensor 11 is provided between the electronic water valve 9 and the pressure switch 10. The water flow sensor 11 is connected to the controller 4. After the outlet 12 of the cold water pipe 7 is opened, the controller 4 receives a pressure reduction signal and controls the flue system 1 to start. After a delay of 3-8 seconds, the electronic water valve 9 opens. The water heater ignites after the controller 4 receives a water flow signal from the water flow sensor 11. During the operation of the water heater, the flue system 1 continuously exhausts smoke. Even after the faucet at the outlet 12 is closed, the flue system 1 continues to exhaust smoke for several seconds before shutting off.
[0017] A water replenishment system is provided on the hot water pipe 8. The water replenishment system includes a water replenishment pipe 13 and a water replenishment valve 14. The water replenishment pipe 13 spans both the electronic water valve 9 and the water flow sensor 11. One end of the water replenishment pipe 13 is located above the electronic water valve 9, and the other end is located below the water flow sensor 11. The water replenishment valve 14 is located in the middle of the water replenishment pipe 13 and is connected to the controller 4. After the controller 4 receives the signal to open the exhaust system 1, the water replenishment valve 14 opens 3-4 seconds later and closes synchronously with the exhaust system 1. The water replenishment pipe 13 is a low-flow pipe, which is insufficient for normal water supply. When the user turns on the faucet and then quickly turns it off, the water heater has not yet completed the exhaust process before combustion, and the electronic water valve 9 is not open. The water pressure in the hot water pipe 8 is in a low-pressure state, which is replenished in time by the water replenishment pipe 13 to prevent the water heater from spontaneously combusting or failing to start the water heater the next time the faucet is turned on.
[0018] After the smoke exhaust system 1 is started, the water supply valve 14 starts synchronously or delayed with the electronic water valve 9. For example, the electronic water valve 9 starts 3 seconds later and the water supply valve 14 starts 4 seconds later. Since the water supply system will be connected to the faucet if it is opened directly, the water supply valve 14 is opened later to ensure that the cold water is heated. This solves the water supply problem without affecting the zero cold water function.
[0019] After receiving a water flow signal, the controller 4 activates the forced switch 19, which in turn activates the pressure switch 10. The controller 4 then controls the electronic water valve 9 and the air valve 5 to open. Once there is no water flow signal, the forced switch 19 is deactivated. This system is suitable for areas with high water pressure.
[0020] A circulation system is provided between the hot water pipe 8 and the cold water pipe 7. The circulation system includes a cold water tank 15, a circulation pipeline 16, and a circulation pump 17. The cold water tank 15 is installed on the cold water pipe 7. One end of the circulation pipeline 16 is connected to the upper part of the electronic water valve 9 near the water tank 2, and the other end is connected to the cold water tank 15. The circulation pump 17 is installed in the middle of the circulation pipeline 16 and is connected to the controller 4. The circulation pump 17 starts and stops synchronously with the exhaust system 1. During this process, when the controller 4 receives a water flow signal, the circulation pump 17 disconnects; when the controller 4 receives a no-water flow signal, the circulation pump 17 starts. After the water heater is turned off, the residual heat in the water heater will cause the water temperature in the water tank 2 to rise, making temperature control impossible. If the tap is turned on again, the hot water flowing from the front of the water heater may scald the user. The circulation system disperses heat and cools the water in advance to protect the user, effectively utilizing a delay time of 3-8 seconds without increasing the water output time of the water heater.
[0021] The smoke exhaust system 1 includes a motor and an exhaust pipe, and the motor rotates to exhaust smoke.
[0022] The combustion chamber 3 is equipped with a flame sensor 18, which is connected to the controller 4. When the controller 4 receives a water flow signal, the flame sensor 18 is turned on; when the controller 4 does not receive a water flow signal, the flame sensor 18 is turned off, and the water heater automatically shuts off.
[0023] When the water outlet 12 is opened, the pressure switch 10, the exhaust system 1 and the circulation pump 17 start working simultaneously. After 3-8 seconds, the electronic water valve 9 opens, the water flow sensor 11 generates a water flow signal, the controller 4 controls the gas valve 5 and the flame sensor 18 to connect, and at the same time, the forced switch 19 connects the pressure switch 10, and the circulation pump 17 is disconnected, and the water heater starts working. When the water outlet 12 is closed, the electronic water valve 9 is closed, the water flow sensor 11 has no water flow signal, and then the controller 4 controls the forced switch 19, the gas valve 5 and the flame sensor 18 to disconnect, the circulation pump 17 starts to work, the exhaust system 1 and the water supply valve 14 are closed synchronously with a delay, and the water heater stops working.
[0024] The above descriptions are merely embodiments of the present invention. Commonly known structures and characteristics are not described in detail here. Those skilled in the art are aware of all common technical knowledge in the field prior to the application date or priority date, are aware of all existing technologies in that field, and have the ability to apply conventional experimental methods prior to that date. Those skilled in the art can, under the guidance of this application, improve and implement this solution in combination with their own capabilities. Some typical known structures or methods should not be obstacles for those skilled in the art to implement this application. It should be noted that those skilled in the art can make several modifications and improvements without departing from the structure of the present invention. These should also be considered within the scope of protection of the present invention, and will not affect the effectiveness of the implementation of the present invention or the practicality of the patent. The scope of protection claimed in this application should be determined by the content of its claims, and the specific embodiments described in the specification can be used to interpret the content of the claims.
Claims
1. A forced-draft gas water heater, comprising a flue gas system (1), a water tank (2), a combustion chamber (3), a controller (4), a gas valve (5), a gas pipeline (6), a cold water pipeline (7), and a hot water pipeline (8), wherein the hot water pipeline (8) is equipped with an electronic water valve (9) and a pressure switch (10), and the controller (4) controls the electronic water valve (9) and the flue gas system (1), characterized in that, A water flow sensor (11) is provided between the electronic water valve (9) and the pressure switch (10). The water flow sensor (11) is connected to the controller (4). After the outlet end (12) of the cold water pipe (7) is opened, the controller (4) receives a pressure reduction signal and controls the start of the exhaust system (1). The electronic water valve (9) opens after a delay of 3-8 seconds. The water heater is ignited after the controller (4) receives the water flow signal from the water flow sensor (11). A water replenishment system is provided on the hot water pipe (8). The water replenishment system includes a water replenishment pipeline. The water replenishment pipeline (13) is a small flow pipeline, which is insufficient for normal water supply. The water replenishment system connects the hot water pipe (8) across the electronic water valve (9) and the water flow sensor (11). The water replenishment system is connected to the controller (4). The water replenishment system is opened 3-4 seconds after the controller (4) receives the start signal of the exhaust system (1). The water replenishment system is closed synchronously with the exhaust system (1).
2. The forced draft gas water heater according to claim 1, characterized in that: The water replenishment system also includes a water replenishment valve (14). The water replenishment pipeline (13) is installed on the hot water pipe (8). The water replenishment pipeline (13) spans both the electronic water valve (9) and the water flow sensor (11). One end of the water replenishment pipeline (13) is located above the electronic water valve (9), and the other end is located below the water flow sensor (11). The water replenishment valve (14) is installed on the water replenishment pipeline (13). The water replenishment valve (14) is connected to the controller (4). After the controller (4) receives the signal to open the smoke exhaust system (1), the water replenishment valve (14) opens 3-4 seconds later. The water replenishment valve (14) closes synchronously with the smoke exhaust system (1).
3. The forced draft gas water heater according to any one of claims 1 or 2, characterized in that: After receiving a water flow signal, the controller (4) turns on the forced switch (19), the forced switch (19) turns on the pressure switch (10), and the controller (4) controls the electronic water valve (9) and the air valve (5) to open; after there is no water flow signal, the forced switch (19) is turned off.
4. The forced draft gas water heater according to claim 3, characterized in that: A circulation system is provided between the hot water pipe (8) and the cold water pipe (7) near the water tank (2). The circulation system is connected to the controller (4). The circulation system starts and stops synchronously with the smoke exhaust system (1). During this period, the circulation system disconnects when the controller (4) receives a water flow signal and starts when the controller (4) receives a no-water flow signal.
5. The forced draft gas water heater according to claim 4, characterized in that: The circulation system includes a cold water tank (15), a circulation pipeline (16), and a circulation pump (17). The cold water tank (15) is installed on the cold water pipeline (7). One end of the circulation pipeline (16) is connected to the upper end of the electronic water valve (9) near the water tank (2), and the other end is connected to the cold water tank (15). The circulation pump (17) is installed in the middle of the circulation pipeline (16). The circulation pump (17) is connected to the controller (4). The circulation pump (17) starts and stops synchronously with the smoke exhaust system (1). During this period, when the controller (4) receives a water flow signal, the circulation pump (17) disconnects. When the controller (4) receives a no-water flow signal, the circulation pump (17) starts.
6. The forced draft gas water heater according to claim 4 or 5, characterized in that: The combustion chamber (3) is equipped with a flame sensor (18), which is connected to the controller (4). When the controller (4) receives a water flow signal, the flame sensor (18) is turned on; when the controller (4) does not receive a water flow signal, the flame sensor (18) is turned off, and the water heater automatically shuts off.