Gas water heater without cold water in whole process

Abstract

The utility model relates to the technical field of gas water heaters, and particularly discloses a gas water heater without cold water in the whole process. The water heater comprises a heat exchanger, a combustion chamber, a controller, a water inlet pipe and a water outlet pipe, the heat exchanger is arranged above the combustion chamber, the water inlet pipe is connected with an inlet of the heat exchanger, the water outlet pipe is connected with an outlet of the heat exchanger, a front water storage tank is arranged on the water inlet pipe, and an electric heater is arranged in the front water storage tank. The front water storage tank with the electric heater is arranged on the water inlet pipe, when the water heater is started for the first time, the electric heater is started at the same time, and hot water is stored in the front water storage tank, so that the hot water in the front water storage tank can be discharged out when water is used for the second time, and it is guaranteed that outlet water is hot before ignition work; therefore, cold water impact during secondary water use is avoided, and the bathing experience is greatly improved.

Description

Technical Field

[0001] The utility model relates to the technical field of gas burners, and specifically discloses a gas water heater without cold water throughout the process. Background Art

[0002] A gas water heater is a household or commercial device that uses natural gas or liquefied petroleum gas as fuel, generates heat through combustion, and then heats water. With its characteristics of rapid heating, energy saving and high efficiency, and simple operation, it is widely used in the hot water supply of households and commercial places.

[0003] The core components of a gas water heater generally include a burner, a heat exchanger and a control system. The burner is responsible for mixing gas and air and then igniting to generate a high-temperature flame. The heat exchanger uses the heat of these flames to heat the water flowing through it, thereby realizing the preparation of hot water. The control system is responsible for monitoring and adjusting the supply amounts of gas and air to ensure combustion efficiency and safety.

[0004] Although gas water heaters have many advantages, there are still some deficiencies in their actual use. Especially during the process of using water for the second time, users often encounter such problems: when the gas water heater is started for the second time, first a section of hot water flows out, then a section of cold water, and then it becomes hot water again. This phenomenon is called "cold water shock", which not only affects the user's bathing experience, but also may cause waste of energy. This problem has not been effectively solved in the existing technology and has become a key bottleneck restricting the performance improvement of gas water heaters. Summary of the Utility Model

[0005] The purpose of the utility model is to overcome the deficiencies of the existing technology and provide a gas water heater without cold water throughout the process.

[0006] The utility model discloses a gas water heater without cold water throughout the process, adopting the following technical scheme:

[0007] A gas water heater without cold water throughout the process includes a heat exchanger, a combustion chamber, a controller, a water inlet pipe and a water outlet pipe. The heat exchanger is arranged above the combustion chamber. The water inlet pipe is connected to the inlet of the heat exchanger. The water outlet pipe is connected to the outlet of the heat exchanger. A pre-storage water tank is arranged on the water inlet pipe, and an electric heater is arranged in the pre-storage water tank.

[0008] Preferably, a bypass pipe is connected to the water inlet pipe. A water pump is arranged on the water inlet pipe. The bypass pipe is parallel to a section of the water inlet pipe including the pre-storage water tank and the water pump to form an internal circulation water path. A water path cut-off valve is arranged on the bypass pipe.

[0009] Preferably, an electric heating temperature sensor is arranged in or behind the pre-storage water tank.

[0010] Preferably, a water inlet temperature sensor is provided on the water inlet pipe of the inner circulation water circuit.

[0011] Preferably, the inlet of the water inlet pipe is provided with a three-way valve and is connected to a cold water pipe and a zero cold water return pipe, the cold water pipe introduces cold water into the water inlet pipe, and the zero cold water return pipe is provided with an external pipeline connected to the water outlet pipe to form an external circulation water circuit.

[0012] Preferably, the water circuit stop valve is a one-way solenoid valve, which controls the inner circulation water circuit to be in the opposite direction to the outer circulation water circuit.

[0013] Preferably, a post-buffer water tank is provided on the water outlet pipe.

[0014] Preferably, a water outlet temperature sensor is provided on the water outlet pipe.

[0015] Preferably, a water flow sensor is provided on the water inlet pipe.

[0016] Preferably, a water servo valve is provided on the water inlet pipe.

[0017] Compared with the prior art, the utility model has at least the following beneficial effects:

[0018] (1) The utility model provides a pre-storage tank with an electric heater on the water inlet pipe. When the water heater is started for the first time, the electric heater is started at the same time to store hot water in the pre-storage tank, so that the hot water in the pre-storage tank can be discharged first when the water is used for the second time, ensuring that the water before ignition is hot, thereby avoiding the cold water shock during the second water use, and greatly improving the bathing experience;

[0019] (2) In summer, when the demand for hot water is not high, hot water can be used only through an electric heater, which can be silent and operate at low power, reducing the minimum temperature rise;

[0020] (3) When a larger load is required, the electric heaters in the combustion chamber and the front water storage tank can be turned on at the same time, which can reduce combustion noise and increase the maximum hot water production rate. BRIEF DESCRIPTION OF THE DRAWINGS

[0021] Figure 1 It is a structural schematic diagram of a gas water heater without cold water in the whole process of the utility model;

[0022] Figure 2 The utility model is a schematic diagram of the water circuit of the gas water heater without cold water throughout the process.

[0023] Description of Figure Numbers:

[0024] 1. Heat exchanger; 2. Combustion chamber; 21. Fan; 3. Controller; 4. Water inlet pipe; 5. Water outlet pipe; 6. Pre-storage water tank; 7. Water pump; 8. Bypass pipe; 9. Waterway stop valve; 10. Electric heating temperature sensor; 11. Water inlet temperature sensor; 12. Water flow sensor; 13. Water servo valve; 14. Post-buffer water tank; 15. Water outlet temperature sensor. Specific embodiments

[0025] In order to make the above objects, features and advantages of the present invention more obvious and understandable, the present invention will be further described in detail below with reference to the drawings and specific embodiments.

[0026] This embodiment discloses a gas water heater without cold water throughout the process. Refer to Figure 1-2 , which includes a heat exchanger 1, a combustion chamber 2, a fan 21, a controller 3, a water inlet pipe 4 and a water outlet pipe 5. The heat exchanger 1 is arranged above the combustion chamber 2. The combustion chamber 2 is connected with a fan 21. The water inlet pipe 4 is connected to the inlet of the heat exchanger 1, and the water outlet pipe 5 is connected to the outlet of the heat exchanger 1. When the water heater is turned on and used, the controller 3 controls the combustion chamber 2 to start. The water in the water inlet pipe 4 enters the heat exchanger 1, is heated, and is discharged from the water outlet pipe 5.

[0027] In the existing gas water heater, after the user starts using it for the first time, when starting to use water for the second time, first a section of hot water flows out, then a section of cold water, and then hot water again, which affects the bathing experience. In response to this, a pre-storage water tank 6 is provided on the water inlet pipe 4 of this solution. The size of the pre-storage water tank 6 can be 0.2L - 5L, and an electric heater with a power of 0.5kW - 5kW is provided in the pre-storage water tank 6. When the use stops once, the controller 3 automatically controls the electric heater in the pre-storage water tank 6 to heat, so that the pre-storage water tank 6 stores hot water. The heating time of the electric heater in the pre-storage water tank 6 is within a certain range, and heating stops when the time exceeds. When the water is turned on again, the pre-heated water in the pre-storage water tank 6 can be discharged first when starting, ensuring that the water before ignition is hot, so as to avoid cold water impact during the second start and achieve the purpose of no cold water during the second start.

[0028] In order to minimize the cold water section as much as possible, when the water heater is turned on for the second time, the controller 3 system detects a water signal. After determining that there is no fault, it does not perform pre-purging and directly starts the ignition valve to burn, which can shorten the cold water section. In addition, the heat exchanger 1 can adopt a hot plate or a non-coiled pipe method, that is, the water inlet is directly connected to the fins of the heat exchanger, shortening the distance of the cold water pipe.

[0029] In order to make the heating more uniform, a bypass pipe 8 is connected to the water inlet pipe 4, and a water pump 7 is provided on the water inlet pipe 4. The bypass pipe 8 is connected in parallel with a section of the water inlet pipe 4 including the front water storage tank 6 and the water pump 7 to form an internal circulation water circuit. The bypass pipe 8 is provided with a water circuit stop valve 9 to open and close the water circuit. When the electric heater starts heating, the water pump 7 can drive the internal circulation water circuit to flow and circulate for heating, so that the water in the front water storage tank 6 and the water in the front end of the water inlet pipe are evenly heated, so that the outlet water temperature is more stable. In addition, the hot water in the bypass pipe 8 lengthens the hot water section of the pipeline. When it is started for the second time, the ignition pull valve is directly started. After the water in the front water storage tank 6 is drained, the water circuit stop valve 9 of the bypass pipe 8 can be opened to increase the hot water inlet flow rate, which provides a better comfortable experience.

[0030] In order to save energy consumption, an electric heating temperature sensor 10 is provided in the front water storage tank 6 or behind the front water storage tank 6. When the gas water heater stops working once, the electric heater in the front water storage tank 6 starts to heat, and when it is heated to 38°C, the heating can be stopped by the controller 3. In addition, an inlet water temperature sensor 11 is provided on the water inlet pipe 4 of the internal circulation water circuit, and the inlet water temperature sensor 11 can be set at a position before the water pump 7 or after the water pump 7. When the water heater stops working once, the electric heater in the front water storage tank 6 heats, the water circuit stop valve 9 in the bypass pipe 8 is opened, and the water pump 7 reverses to circulate. When the temperature in the front water storage tank 6 reaches a predetermined value, and the temperature difference Δt between the electric heating temperature sensor 10 and the water inlet temperature sensor 11 is less than or equal to 5°C, the heating stops, the water pump 7 stops working, and the water circuit stop valve 9 of the bypass pipe 8 is closed, thereby ensuring that the water in the front water storage tank 6 can be evenly heated and the amount of heated water is sufficient, avoiding unnecessary waste caused by continuous circulation heating.

[0031] In order to further reduce the water temperature fluctuation during intermittent use, a post-buffer water tank 14 with a certain number of liters is provided at the water outlet. The post-buffer water tank 14 plays a buffering role in mixing cold and hot water to avoid the heating temperature being insufficient due to the secondary start-up time interval being too short, or the water stop temperature rise being too high due to the heat exchanger, or the water flow change during the process causing the water outlet temperature difference to be too large, thereby greatly improving the bathing experience.

[0032] This gas water heater solution is applicable to the zero - cold - water function. A three - way valve is provided at the inlet of the water inlet pipe 4 and is connected to a cold - water pipe and a zero - cold - water return pipe (not shown in the figure). Cold water is introduced into the water inlet pipe through the cold - water pipe, while the zero - cold - water return pipe is connected to the water outlet pipe through an external pipeline to form an external circulation water path. When the user needs zero - cold - water, the zero - cold - water function is turned on for external circulation, heating the external pipeline and the zero - cold - water return pipe, thereby heating the water in the pipe between the faucet and the hot - water outlet of the gas water heater. The water heater in this solution can provide a full - process zero - cold - feeling bathing experience, solving both the cold - water problem in the rear - end hot - water pipe and the problem of the middle cold - water section during secondary startup, greatly enhancing the bathing experience.

[0033] To optimize the circulating heating effect of the bypass pipe 8, the water - path cut - off valve 9 is a one - way solenoid valve. The one - way solenoid valve makes the water in the bypass pipe 8 flow unidirectionally, thus controlling the water flow direction in the internal circulation water path to be opposite to that in the external circulation water path. When the water heater stops working, the pre - storage water tank 6 starts to heat up, and the water pump 7 starts to rotate in reverse (because when the pipe with the zero - cold - water function rotates forward, it will be the same as the zero - cold - water function, with a long heating pipe and slow circulation. When rotating in reverse, due to the effect of the one - way solenoid valve, it only works in a small circulation and cannot participate in the large circulation of the external pipeline), for small - circulation heating, improving the hot - water storage rate of the pre - storage water tank 6 and reducing energy - consumption waste.

[0034] In addition, the gas water heater in this solution can be adjusted to different heating modes according to actual situations. In summer when the external environment is relatively hot, the electric heater can be used to replace gas for heating. A water - flow sensor 12 and a water servo - valve 13 are provided on the water inlet pipe 4. The controller 3 can then regulate the electric power of the electric heater and adjust the water volume through the water servo - valve 13 to achieve constant temperature, which can be both quiet (without the sound of combustion and the fan) and operate at low power to reduce the minimum temperature rise. A water - outlet - end temperature sensor 15 is provided on the water outlet pipe 5, enabling the controller 3 to adjust the power and water volume according to the feedback of the outlet water temperature, making the constant - temperature control more intelligent. In winter when the external environment is relatively cold and a larger load is required, the combustion and the electric heater in the water tank can also be turned on simultaneously. This can not only reduce the combustion noise (for the same 20 kW, the combustion power and the fan speed of using 20 kW of gas are higher than those of using 20 kW of gas + electricity, and the latter has a lower combustion power and fan speed, with relatively less noise), but also increase the maximum hot - water production rate (the original 16L machine has a power of 30 kW, and with the addition of the electric - heating power, a hot - water production rate above 16L can be achieved).

[0035] The above has introduced the technical solution provided by the present utility model in detail. Specific examples are used in this article to elaborate on the principle and implementation manner of the present utility model. The description of the above embodiments is only used to help understand the method and its core idea of the present utility model; at the same time, for those of ordinary skill in the art, according to the idea of the present utility model, there will be changes in the specific implementation manner and application scope. In summary, the content of this specification should not be construed as a limitation to the present utility model.

Claims

1. A gas water heater without cold water, comprising a heat exchanger, a combustion chamber, a controller, a water inlet pipe and a water outlet pipe, wherein the heat exchanger is arranged above the combustion chamber, the water inlet pipe is connected to the inlet of the heat exchanger, and the water outlet pipe is connected to the outlet of the heat exchanger, characterized in that: A front water storage tank is arranged on the water inlet pipe, and an electric heater is arranged in the front water storage tank.

2. The gas water heater without cold water during the whole process according to claim 1, characterized in that: The water inlet pipe is connected to a bypass pipe, a water pump is arranged on the water inlet pipe, the bypass pipe is connected in parallel with a section of the water inlet pipe including a front water storage tank and a water pump to form an internal circulation water circuit, and a water circuit stop valve is arranged on the bypass pipe.

3. The gas water heater without cold water during the whole process according to claim 2, characterized in that: An electric heating temperature sensor is arranged in the front water storage tank or behind the front water storage tank.

4. The gas water heater without cold water during the whole process according to claim 3, characterized in that: A water inlet temperature sensor is provided on the water inlet pipe of the inner circulation water circuit.

5. The gas water heater without cold water during the whole process according to claim 2, characterized in that: The inlet of the water inlet pipe is provided with a three-way valve and is connected to a cold water pipe and a zero cold water return pipe. The cold water pipe introduces cold water into the water inlet pipe. The zero cold water return pipe is provided with an external pipeline connected to the water outlet pipe to form an external circulation water circuit.

6. The gas water heater without cold water during the whole process according to claim 5, characterized in that: The water circuit stop valve is a one-way solenoid valve, which controls the inner circulation water circuit in the opposite direction to the outer circulation water circuit.

7. The gas water heater without cold water during the whole process according to any one of claims 1 to 6, characterized in that: A post-buffer water tank is provided on the water outlet pipe.

8. The gas water heater without cold water during the whole process according to any one of claims 1 to 6, characterized in that: The water outlet pipe is provided with a water outlet temperature sensor.

9. The gas water heater without cold water during the whole process according to any one of claims 1 to 6, characterized in that: A water flow sensor is arranged on the water inlet pipe.

10. The gas water heater without cold water during the whole process according to any one of claims 1 to 6, characterized in that: A water servo valve is arranged on the water inlet pipe.

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