WO2012000311A1

WO2012000311A1 - Gas water heater and water charging/discharging control method thereof

Info

Publication number: WO2012000311A1
Application number: PCT/CN2011/001073
Authority: WO
Inventors: 邱步; 曾祥才; 毕大岩; 窦礼亮; 蔡茂虎
Original assignee: 艾欧史密斯(中国)热水器有限公司
Priority date: 2010-06-30
Filing date: 2011-06-29
Publication date: 2012-01-05
Also published as: CN102062465A

Abstract

A gas water heater and a water charging/discharging control method thereof are disclosed. The gas water heater includes a water tank (1), a burner (3) and a heat exchanging assembly. The burner (3) is arranged at the top of the water tank (1), and is connected with the heat exchanging assembly in the water tank (1) to supply heat to it. A hot water discharging assembly is connected to an upper part of the water tank (1). An upper cold water supply assembly is connected to the upper part of the water tank (1) and a lower cold water supply assembly is connected to a lower part of the water tank (1), and the upper cold water supply assembly and the lower cold water supply assembly are connected to a cold water supply source. The gas water heater with the above structure can prevent the water temperature at the upper part of the water tank from over-heating and supply more constant-temperature hot water by a water tank with a smaller capacity.

Description

Gas water heater and control method thereof

Technical field

The invention relates to a gas water heater, and relates to an improvement of the structure of the inlet and outlet water and a control method of the inlet and outlet water, and belongs to the technical field of water heaters.

Background technique

According to the applicant's understanding, the conventional volumetric gas water heaters currently on the market use a burner placed in the lower part of the water tank, and the water in the lower part of the tank and the water in the upper part.

Specifically, the burner of the conventional volumetric gas water heater is placed at the bottom of the water tank, and the combustion heat exchange pipeline is arranged in the water tank, so that the high temperature flue gas generated by the combustion uses its own hot head to flow from bottom to top, to the water tank. The cold water in the heating is heated. The corresponding water inlet and outlet structure of the combustion system includes a water inlet at the bottom of the water tank and a water outlet at the top of the water tank. In the heating stage, after the cold water is heated, since the density of the hot water is less than the density of the cold water, the hot water rises under the action of gravity, and the cold water drops, forming a water layer having a high temperature and a low temperature inside the water tank. When the user uses water, the hot water is discharged from the top, although the cold water will be replenished from the lower part at this time. Due to the high density, the lower hot water is gradually pushed to the upper part of the water tank, so the temperature of the top hot water is not directly affected. Due to the full use of the stratification characteristics of water, users do not experience water temperature fluctuations when using water. This type of water inlet and outlet structure has not changed greatly for decades. For example, the patent number US3,324,925 published in 1967, the US name is Gas Burner. Patent, US Patent No. 7,721,677 issued in 2010, and the US patent entitled Water Heater and Control, all use a similar inlet pipe that contains a Dip Tube from the top to the bottom of the tank and a water tank. The water inlet and outlet structure of the top outlet.

In recent years, according to market demand, there has been a high-power volumetric gas water heater with a burner placed on the top of the water tank. When such a volumetric gas water heater follows the above-mentioned water inlet and outlet structure, the following obvious disadvantages occur: 1) due to hot and cold water Layering, the original hot water is at the top of the tank, when burning When the device is started, it is easy to cause overheating due to continuous heating of the hot water layer. 2) Since the burner is forced to flow from the top to the bottom through the flue gas flow path in the water tank, the hot water layer is changed a lot. Heat, while the temperature drops to the bottom layer, and the heat exchange with the lower cold water layer is relatively small, resulting in a slow rise in the temperature of the cold water layer or failure to reach the expected temperature, affecting the provision of hot water. Therefore, the traditional down-and-out type of water intake cannot be adapted to this new high-power volumetric gas water heater.

The search found that the Chinese patent with the patent number CN9724764 patented "Upstream Water Electric Water Heater" proposed a water heater that can enter the water from the upper part. However, this type of water heater is an open structure, which is essentially different from the conventional confined water tanks commonly used in water heaters, in which the inflow and outflow are not performed at the same time. The so-called closed pressurized water tank means that the water tank is sealed except for the position of the inlet and outlet water, and does not communicate with the outside world. Therefore, the inlet and outlet water must be simultaneously performed. At the same time, the structure of the above patent is to avoid the mixing of hot and cold water. If the water storage is used up, it must stop and wait. It is a backward design. Summary of the invention

The object of the present invention is: In view of the problems encountered in the above-mentioned high-power gas water heater, through the innovative improvement of the water inlet and outlet water structure, a gas water heater and its inlet and outlet water control method are proposed, so that the upper part of the water tank can be effectively avoided when the water heater is running. The water temperature is too hot, making the heat exchange in the water tank more reasonable and sufficient.

In order to achieve the above object, the gas water heater of the present invention comprises a water tank, a burner and a heat exchange assembly, and a burner is installed at the top of the water tank, the burner being associated with a heat exchange component located in the water tank to provide heat energy to the heat exchange component The upper part of the water tank is coupled with a hot water output assembly, wherein: the upper portion of the water tank is coupled with an upper cold water supply assembly, and the lower portion is also coupled with a lower cold water supply assembly, the upper cold water supply assembly and the lower cold water supply assembly Connected to a cold water supply.

The upper part of the tank is connected with an upper cold water supply unit, and the lower part is also connected with a lower cold water. The components are supplied, so that the aforementioned overheating problem can be effectively prevented.

The gas water heater is further characterized by further comprising a constant temperature pipeline connected to the hot water output component and the cold water supply source, and a water quantity control for controlling the mixing ratio of the hot water and the cold water in the constant temperature pipeline respectively from the hot water output component and the cold water supply source. valve. For the conventional water inlet type water heater, after a period of convection and heat conduction heat transfer, the physical stratification of the hot and cold water due to the density difference must exist in the water tank. When the water enters, the lower part of the water tank Cold water will not mix with the hot water in the upper part, which is very beneficial for improving the hot water usage of the tank. For the volumetric water heater on the burner, in order to solve the problem that the upper hot water is easily overheated, an upper cold water supply assembly located at the upper part of the water tank is introduced, and as a result, the cold water provided at the upper portion will disturb the stable state of the upper hot water, making the cold The stratification of the hot water becomes confusing, causing fluctuations in the temperature of the effluent, causing discomfort to the user. Therefore, a water quantity control valve is arranged on the outlet pipe, and the water quantity control valve is used to correlate the water quantity of the hot water output unit with the water quantity of the cold water supply source, so that the water temperature in the constant temperature pipe is kept constant.

The following are further features of the gas water heater of the present invention, which are either in parallel or in a progressive relationship:

The water quantity control valve is disposed at least at a junction of the hot water output assembly or the cold water supply source to the constant temperature pipe, and the intersection of the hot water output assembly to the constant temperature pipe and the cold water supply to the constant temperature pipe. In particular, the water quantity control valve is an electric water hammer.

The gas water heater further includes a control circuit; the water temperature and water quantity detecting device is respectively installed in the hot water outlet pipe and the cold water supply source to the constant temperature pipe, and the water temperature and water quantity detecting device and the control circuit are respectively Constructing a signal transmission channel with a feedback temperature signal and a water quantity signal, and a signal transmission channel for transmitting a control signal for controlling the opening degree of the water quantity control valve is constructed between the control circuit and the water quantity control valve, and the control signal is controlled by the control circuit The temperature signal and the water quantity signal detected by the water temperature and water quantity detecting device are generated. In this way, the control circuit can control the opening degree of the water quantity control valve according to various temperature signals and water quantity signals, thereby obtaining constant temperature hot water. And to ensure the accuracy of the temperature.

The water quantity control is disposed at a junction of a hot water output assembly to a pipeline of the constant temperature pipeline and a pipeline of the cold water supply source to the constant temperature pipeline, wherein the water quantity control valve is a mechanical mixing valve, and the mechanical mixing valve has a heat The water inlet, a cold water inlet and an outlet, the hot water inlet is connected to the hot water output component, and the cold water inlet is connected to the cold water supply source. In particular, the mechanical mixing valve is a constant temperature mixing water containing a memory alloy spring. The mechanical mixing valve does not require an additional control circuit, which makes the system structure simple, and the reaction speed is fast, and the constant temperature performance is good.

The ratio of the water output of the upper cold water supply component to the lower cold water supply component is controlled at

Within the range of 1/4040/1. Tests have shown that the area ratio in this range avoids overheating problems and does not make the hot water yield too low.

The upper cold water supply assembly includes an upper water inlet provided in an upper portion of the water inlet pipe in the water tank, and the lower cold water supply assembly includes a lower water inlet provided in a lower portion of the water inlet pipe, the upper end of the water inlet pipe being in communication with a cold water supply source. The upper cold water supply unit and the lower cold water supply unit are mostly built in the water tank. The water inlet pipe is arranged in the water tank, and the water supply pipe is used to distribute the upper and lower water inlets, so that the overall structure is compact, and the cold water flows from the top to the bottom in the water inlet pipe. There is a preheating process.

The upper portion of the water tank is provided with a connection port, one end of the connection port is coupled with a cold water supply source, and the other end is coupled to an upper end of the water inlet pipe. By connecting the inlet pipe and the cold water supply source through the connection port, the pipe does not slide relative to the tank liner, which enhances the stability of the structure.

The lower end of the inlet pipe is near the bottom of the water tank. The closer to the bottom of the tank, the higher the utilization of the tank.

The upper water inlet and the lower water inlet are a predetermined number of holes. Water is introduced through a certain number of holes, and water is sprayed in multiple directions to make the water inlet more uniform.

The inlet pipe also has an additional water inlet located between the upper water inlet and the lower water inlet. Adding additional water inlets can make the cold water distribution in the tank liner more uniform and increase the hot water yield. The upper cold water supply assembly includes an upper water inlet provided at an upper portion of the water tank, one end of the upper water inlet is coupled with a cold water supply source, and the lower cold water supply assembly includes a lower water inlet provided at a lower portion of the water tank One end of the lower water inlet is coupled to a cold water supply source. The upper cold water supply unit and the lower cold water supply unit are mainly externally placed in the water tank, so that the maintenance is convenient, and various valves can be conveniently added to accurately control the amount of cold water supply to the upper and lower portions.

A water quantity control valve is disposed in the pipeline between the lower water inlet and the cold water supply source. Or a water quantity control valve is disposed in the pipeline between the upper water inlet, the lower water inlet, and the cold water supply source. This allows for more precise control of the lower inlet water.

The hot water output assembly includes a water outlet provided on an upper portion of the water tank and a hot water outlet pipe connected to the water outlet, wherein the hot water outlet pipe is a pipe of the hot water output assembly to the constant temperature pipe.

The water tank is a closed pressure water tank. The sealed pressurized water tank has a long life and simple control, and can provide a large outlet pressure to improve user comfort.

The inlet and outlet water control method of the gas water heater of the invention:

The burner is disposed at an upper portion of the water tank to provide heat from the upper portion of the water tank to the water tank to heat the water in the water tank;

Discharging hot water in the upper part of the water tank, and supplying cold water to the upper and lower portions of the water tank respectively; introducing cold water to the discharged hot water, mixing cold water and hot water, and controlling the amount of the introduced cold water and/or the discharged hot water to Get a constant temperature water source.

Further, the amount of the introduced cold water and/or the discharged hot water is controlled in accordance with the amount of water discharged from the hot water and the temperature of the water and the amount of water introduced into the cold water and the temperature of the water to obtain a constant temperature water source.

The invention is advantageous in that: when the water heater of the invention is in operation, the high temperature flue gas or heat energy provided by the burner flows from the top to the bottom through the heat exchanger or the heat exchange unit to exchange heat with the water stored in the water tank. When the hot water output unit outputs hot water, the supplemental cold water is in two parts, and a part of the upper cold water supply unit enters the water tank to contact the combustion chamber of the burner, and simultaneously with the water tank. The upper high-temperature hot water is mixed, thereby suppressing the temperature in the upper portion of the water tank and effectively preventing overheating. Another part of the cold water enters the bottom of the water tank from the lower cold water supply unit. When the upper cold water supply unit is prevented from replenishing too much water, the upper layer hot water temperature is affected too much by the user. Since the water inlet and outlet water structure of the invention can be reasonably distributed, the amount of upper and lower cold water can be reasonably distributed. Therefore, while avoiding overheating of the upper layer water temperature, the heat exchange in the water tank can be made more reasonable and sufficient, thereby achieving the purpose of supplying as much hot water as possible. .

In addition, after adopting the structure and method of the present invention, the cold water entering the water tank from the upper cold water supply assembly is mixed with the high temperature hot water in the upper part of the water tank, so that the temperature thereof is lower than the water temperature in the middle layer of the water tank, and the density is relatively increased, thereby causing sinking. Movement trend; when the cold water entering the water tank from the lower cold water supply component is heated, the density becomes smaller and the rising motion trend occurs; the combination of the two causes turbulence in the water tank, which helps to accelerate the heat exchange rate and improve the heat exchange efficiency. .

In short, the invention breaks through the traditional thinking that the water inlet position is generally placed at the bottom of the water tank. By adding an inlet water supply component in the upper part of the water tank, the problem that the high-power volumetric water heater water tank is easily overheated is skillfully solved, and can be provided by a small-capacity water tank. As much hot water as possible, and also has the effect of improving heat exchange rate and heat exchange efficiency, and has outstanding substantive features and significant progress compared with the prior art.

BRIEF DESCRIPTION OF DRAWINGS FIG. 1 is a schematic view of a first embodiment of the present invention.

2 is a schematic diagram of Embodiment 2 of the present invention.

Figure 3 is a diagram showing the relationship between the integrated water intake and the water pressure in the second embodiment.

4 is a comparison diagram of performance of a second embodiment of the present invention and a conventional volumetric water heater.

DETAILED DESCRIPTION OF THE INVENTION Although the terms used hereinafter are selected from well-known public terms, some terms are used. The applicant is selected according to his judgment, and the detailed meaning thereof should be understood according to the spirit of the present application. For example, the "joining" mentioned in the following description or the following is not limited to being directly connected as shown in the drawing. It may be indirectly connected; the aforementioned or the following "communication" is not limited to direct communication as shown in the drawings, and may be indirect communication. Embodiment 1

1 is a schematic structural view of a first embodiment of the present invention. The sealed pressure water heater (may be, but not limited to, a volumetric water heater) includes a water tank 1, a lower burner 3 is disposed at an upper end of the water tank 1, a burner upper end is coupled with the fan 4, and a lower end is coupled with a combustion built in the water tank 1. The heat device 2 (including the combustion heat exchange line) is coupled, and the combustion heat exchange device 2 discharges the flue gas through the outlet 11. A hot water outlet 7 is disposed in the upper portion of the water tank 1, and the water outlet 7 and the hot water outlet pipe 71 constitute a hot water outlet assembly, and the hot water outlet assembly provides a hot water flow passage. The upper part of the water tank 1 is further provided with a connection port 8 in which an inlet pipe 9 is installed. The end (ie, the lower end) of the inlet pipe 9 is close to the bottom of the water tank 2, and the upper part of the inlet pipe 9 located in the water tank 1 is provided with an upper portion. The nozzle 91 has a lower water inlet 92 at the lower portion. The connecting port 8 is also connected to the water inlet pipe 81 of the cold water source outside the water tank 1, the other end of the connecting pipe 81 is connected to the first end of the three-way valve 82, and the second end of the three-way valve 82 is connected to the cold water supply source. The third end of the three-way valve 82 is coupled to one end of the electric water quantity control valve 5, and the other end of the electric water quantity control valve 5 is coupled to the hot water outlet line 71, and the hot water outlet line 71 is finally coupled to the customer end through the constant temperature line 6. . The upper water inlet 91, a part of the water inlet pipe 9 (a part from the upper water inlet 91), the connection port 8, and the coupling line 81 constitute an upper cold water supply unit, a lower water inlet 92 and another portion of the water inlet pipe 9 (water inlet 91). The part between 92) constitutes the lower cold water supply component. At the same time, the water temperature and water amount detecting means A, Bo are respectively provided on the combined hot water outlet pipe 71 and the cold water inlet pipe 81. The signals obtained by the detecting means are transmitted to the control circuit 10, and the control circuit 10 controls the amount of water by an algorithm described later. The opening degree of the wide 5 is controlled, and the control signal is fed back to the water amount control valve 5, so that the initial hot water of the hot water outlet pipe 71 and a part of the cold water of the cold water inlet pipe 81 are mixed to provide hot water in the constant temperature pipe 6. Or the hot water required by the user can achieve the purpose of constant water temperature. Let the total flow into the tank 2 be Q. The flow rates of the upper and lower inlets are respectively Q ₂ , then:

Q ₀ = Q _l +Q ₂ - (i)

Due to >0, a part of the water enters from the upper part of the tank. When the pressure is sufficient, it will be injected into the combustion chamber, effectively reducing the temperature of the combustion chamber wall and mixing with the surrounding high-temperature hot water, reducing the temperature at the top of the tank and reducing overheating. The possibility. At the same time, since the part of the cold water density is greater than the surrounding hot water, it will move from top to bottom, continuously mixing with the surrounding hot water, causing turbulence in the upper part of the water tank, destroying the original hot and cold water stratification, further reducing the overheating. Possibility, at the same time, by the inertia of the water flowing from top to bottom, the cold water in the lower part of the water tank is stirred, so that the cold water is rapidly heated, the utilization rate of the water tank is improved, and the heating time is shortened.

In order to ensure better anti-overheating and water mixing effects under different water inflow conditions, it is necessary to match the flow rates of the upper inlet and the lower inlet, or to make the inlet area ratio of the two waters within a certain range. , a large number of experiments prove (whether it is necessary to add data?), the area ratio is best between 1/40-40/1.

At the same time, the temperature of the hot water at the detecting device A is T ₃ , the flow rate of the hot water is Q3, the temperature of the cold water at the detecting device B is T ₄ , the flow rate of the cold water is Q ₄ , and the temperature at the constant temperature line 6 is T. _Ut , the outlet water flow is Qout, then: a = a = a + e ₂ - (2)

In order to keep the water temperature constant, it is necessary to:

Then the outlet hot water temperature is stable within the set temperature range.

Embodiment 2

This embodiment provides an alternative device of the first embodiment, as shown in FIG. 2: the sealed pressure water heater (which may be, but not limited to, a volumetric water heater) includes a water tank 1 and the upper end of the water tank 1 is disposed. Downward burner 3, the upper end of the burner is coupled to the blower 4, the lower end is coupled to the combustion heat exchange line 2, and the heat exchange device 2 discharges the flue gas through the outlet 11. The upper portion of the water tank 1 is provided with an upper water inlet 91, and the upper water inlet 91 is coupled to the first end of the four-way valve 82 through a line 94 to constitute an upper cold water supply assembly. The lower portion of the water tank 1 is provided with a lower water inlet 92, and the lower water inlet 92 is connected to the second end of the four-way valve 82 through a pipeline, and the pipeline is provided with a water amount control valve 93 to constitute a lower cold water supply assembly. The water tank 1 is further provided with a water outlet 7 which is coupled to the water inlet end of a water quantity control valve 5 through a hot water outlet line 71 to form a hot water supply unit. The other water inlet end of the water amount control valve 5 is coupled to the third end of the four-way valve 82 through a line. The outlet of the water volume control valve 5 is coupled to the customer end, and the inlet of the four-way valve 82 is coupled to the cold water supply. The water quantity control valve 93 here is a check valve. The water quantity control valve 5 is a mechanical thermostatic mixing valve.

Through the cooperation of the water quantity control valve 93 and the line 94, the flow rate of the water entering the upper water inlet 91 can be accurately controlled so as not to be affected by the change of the total water quantity Q, thereby achieving a continuous and stable cooling of the combustion chamber. For the best anti-overheating function.

Where C is the optimum water flow value determined by experiment.

In order to meet the above water quantity requirements, the flow rate curve of the water quantity control valve 93 is:

The above curves for C, Q ₂ and combined water inflow are shown in Figure 3. FIG 0 "A- 8 relationship with the total pressure head, 0-CDE relationship Q ₂ and the total pressure head, 0 ~ A- F- G Q. relationship with the total head.

Through experimental tests, such a device can achieve the effect that: when the water volume is small, all the water supply enters from the upper water inlet 91, and at this time, even if the combustion system is in the working state, overheating can be avoided, and the hot water in the water tank is evenly distributed; When the amount of water is large, the water quantity control valve 93 is opened, the upper water inlet 91 still maintains the flow rate in the case of a small amount of water, and the remaining water supply enters the water tank from the lower water inlet 92 to prevent insufficient supply of hot water caused by a large amount of cold water entering from the upper portion. Experiments show that the upper water inlet 91 and four The inlet pipe 94 between the valve 82 has an inner diameter of 4, and the water quantity control valve 93 between the lower water inlet and the four-way valve 82 is a check valve pressure of 0. 2kg. Under the condition of =5- 16L/min, the upper inlet water pressure can be controlled to about 3L/min, which is in line with expectations.

The mechanical constant temperature mixing water width 5 is a mixing valve with a memory alloy spring. The working principle is that the sensitivity of the memory alloy to the temperature is used to automatically adjust the mixing amount of the hot and cold water to achieve a constant outlet temperature. This temperature-regulating structure is simple and easy to operate without a control system.

Figure 4 shows a comparison of the hot water production capabilities of this embodiment and the corresponding products. In this embodiment, the input load is 26kw, the water temperature is increased by 40°C, and the volume is 80L. Compared with a fast gas water heater with an input load of 26kw (water supply capacity of 13L/min under 25 degree temperature rise) and an 80L capacity, input power. 20kw volumetric water heater. The A' B' CD' line in the figure is the discharge curve of the traditional 80L volume water heater. The water heater can discharge water for 8 minutes at a flow rate of 10L/min, then drop to 6. 25L/min for continuous discharge; the ABCD line is the capacity of 80L. For example, the water discharge curve, the water heater first discharge water for 10 minutes at a flow rate of 12L/min, and then the water flow can be continuously discharged at a flow rate of 10. 5L/min; A, 'E line is the discharge curve of a 13-liter fast machine, which can only be lOL /min continues to drain, and the height difference between the line CD and the line B'E is caused by the difference in efficiency between the present embodiment and the 13-liter fast machine. In this embodiment, the water supply capacity in a certain period of time is the sum of the areas of the three areas I, II, and m. The water supply capacity of the conventional 80L volume water heater is the area of the I area, and the water supply capacity of the 13L speed machine is the I and II areas. The sum of the areas. As can be seen from the figure, this embodiment has advantages over conventional volumetric gas water heaters of comparable capacity and fast water heaters of comparable input power, and combines the advantages of volumetric water heater water tanks and fast water heaters with high power, and has obvious technological progress.

The following table shows the data related to the hot water yield test under different inlet and outlet water ratios. It can be seen that the ratio of the water output of the upper cold water supply unit to the lower cold water supply unit is controlled within the range of 1/40-40/1, which can be compared. The ideal effect. Up and down into the water into the water accounted for hot water time hot water yield

Bibi /min /gal

40. 00 0. 98 2 8. 4

14.60 0. 94 7 29. 4

2. 00 0. 67 10 42

1. 00 0. 50 13 54. 6

0. 50 0. 33 11 46. 2

0.07 0. 06 8 33. 6

0. 03 0. 02 3 12. 6

The present invention is not limited to the above embodiment, and has many variations. For example, in order to maintain a flexible selection of the position of the constant temperature water quantity control valve, the water quantity control valve may be disposed in the piping of the hot water output assembly to the constant temperature pipe, It can be set in the pipeline from the cold water supply source to the constant temperature pipeline, or in the pipeline from the hot water output component to the constant temperature pipeline and the pipeline from the cold water supply source to the constant temperature pipeline, or in the hot water output component and From the intersection of the cold water supply source to the constant temperature pipeline, it will be understood by those skilled in the art that there are two upper and lower water inlets, and by controlling the ratio of the water flow rate of the upper and lower inlets, for example, controlling the upper and lower by the pipe diameter and the water quantity control valve. The method of water inlet flow ratio and its apparatus fall within the scope of protection of the present invention.

Claims

A gas water heater comprising a water tank, a burner, and a heat exchange assembly, the top of the water tank being provided with a burner, the burner being associated with a heat exchange assembly located in the water tank to provide thermal energy to the heat exchange assembly; The upper portion is coupled with a hot water output assembly, characterized in that: an upper portion of the water tank is coupled with an upper cold water supply assembly, and a lower portion is also coupled with a lower cold water supply assembly, the upper cold water supply assembly and the lower cold water supply assembly and the cold water supply. coupling.

2. The gas water heater according to claim 1, wherein: the gas burner further comprises a constant temperature pipe respectively communicating with the hot water output component and the cold water supply source, and the control is respectively from the hot water output component and the cold water supply source. The water quantity control valve is mixed with hot water and cold water in a constant temperature pipeline.

3. The gas water heater according to claim 2, wherein: the water quantity control valve is disposed at least in a hot water output assembly or a cold water supply source to a constant temperature pipeline, and a hot water output assembly to a constant temperature pipeline One of the intersections of the cold water supply and the piping of the constant temperature pipe.

4. The gas water heater according to claim 2, wherein: said water quantity control valve is an electric water valve.

The gas water heater according to claim 2, wherein: the gas water heater further comprises a control circuit; wherein the hot water outlet pipe and the cold water supply source to the constant temperature pipe are respectively filled with water temperature and a water quantity detecting device, a signal transmission channel for feeding back a temperature signal and a water quantity signal is constructed between the water temperature and water quantity detecting device and the control circuit, and a control circuit and the water quantity control valve are configured to transmit and control the opening of the ice quantity control valve Signal transmission of control signals

1Z The control signal is generated by the control circuit based on the temperature signal and the water amount signal detected by the water temperature and water amount detecting means.

6. The gas water heater according to claim 2, wherein: the water quantity control valve is disposed at a junction of a hot water output assembly to a conduit of the constant temperature conduit and a conduit of the cold water supply source to the constant temperature conduit, the amount of water The control valve is a mechanical mixing valve. The mechanical mixing valve has a hot water inlet, a cold water inlet and an outlet. The hot water inlet is connected to the hot water output assembly, and the cold water inlet is connected to the cold water supply.

7. The gas water heater according to claim 6, wherein: the mechanical water mixing valve is a thermostatic mixing valve including a memory alloy spring.

8. The gas water heater according to claim 1, wherein: the ratio of the water discharged from the upper cold water supply unit to the lower cold water supply unit is controlled within a range of 1/40 to 40/1.

9. The gas water heater according to claim 8, wherein: the upper cold water supply assembly comprises an upper water inlet provided in an upper portion of the water inlet pipe in the water tank, and the lower cold water supply assembly includes a lower portion of the water inlet pipe. The lower inlet, the upper end of the inlet pipe is in communication with the cold water supply.

The gas water heater according to claim 9, wherein the upper portion of the water tank is provided with a connection port, one end of the connection port is coupled to a cold water supply source, and the other end is coupled to an upper end of the water inlet pipe.

The gas water heater according to claim 9, wherein: the water inlet pipe The lower end is near the bottom of the water tank.

12. The gas water heater according to claim 9, wherein: the upper water inlet and the lower water inlet are a predetermined number of holes.

13. The gas water heater according to claim 9, wherein: the inlet pipe further has an additional water inlet, and the additional water inlet is located between the upper water inlet and the lower water inlet.

14. The gas water heater according to claim 8, wherein: the upper cold water supply assembly includes an upper water inlet provided in an upper portion of the water tank, and one end of the upper water inlet is coupled to a cold water supply source; The lower cold water supply assembly includes a lower water inlet provided at a lower portion of the water tank, and one end of the lower water inlet is coupled to a cold water supply source.

The gas water heater according to claim 14, wherein a water amount control valve is disposed in a line between the lower water inlet and the cold water supply source.

16. The gas water heater according to claim 14, wherein: a water amount control valve is disposed in the pipeline between the upper water inlet, the lower water inlet, and the cold water supply source.

The gas water heater according to claim 2 or 8, wherein: the hot water output assembly comprises a water outlet provided in an upper portion of the water tank and a hot water outlet pipe connected to the water outlet, the heat The water outlet pipe is a pipe of the hot water output component to the constant temperature pipe.

18. The gas water heater according to claim 1, wherein: the water tank is a closed pressure water tank.

19. A method for controlling inlet and outlet water of a gas water heater, characterized in that a burner is disposed at an upper portion of the water tank to provide heat energy from the upper portion of the water tank to the water tank to heat the water in the water tank;

The method according to claim 19, wherein the introducing cold water and/or the discharging hot water is controlled according to the amount of water discharged from the hot water and the temperature of the water and the amount of water and water introduced into the cold water. The amount to get a constant temperature water source.

If