Gas water heater and operation method thereof

Abstract

The invention discloses a gas water heater and an operation method thereof. The gas water heater comprises a shell. The heat exchanger is arranged in the shell; the water pipe is connected with the heat exchanger which is used for heating water in the water pipe; the flow meter is mounted on the water pipe and used for detecting the water flow of the water pipe; the water inlet thermometer is arranged at the water inlet end of the water pipe and used for detecting the water inlet temperature of the water pipe; the constant-temperature water tank is arranged at the water outlet end of the water pipe, a heater is arranged on the constant-temperature water tank and can heat water in the constant-temperature water tank, and the water outlet end of the constant-temperature water tank is connected with a water using point; and the outlet water thermometer is arranged on the constant-temperature water tank and is used for detecting the temperature of water in the constant-temperature water tank. According to the gas water heater, compared with the scheme that in the prior art, a large-capacity water storage tank is adopted for storing hot water so as to avoid too low water outlet temperature, the constant-temperature water tank adopted by the gas water heater is smaller in size, and the waiting time is not too long when a user uses the water heater again.

Description

Technical Field

[0001] The present invention relates to the technical field of kitchen appliances, and in particular to a gas water heater and an operating method thereof. Background Art

[0002] After a conventional constant-temperature gas water heater is turned on, the time interval from detecting water flow to ignition of the water heater is at least two seconds, and it takes about ten seconds from ignition to the water outlet temperature reaching the preset temperature. Users will use shower products such as shampoo and shower gel during showering. When the water outlet temperature is close to the preset temperature when it is turned on again after a short pause, it still takes two to three seconds for the water to ignite and reach the preset temperature. It can be seen that when an ordinary constant-temperature gas water heater is turned on again, there will be at least four seconds of low-temperature water, which makes users who are bathing feel uncomfortable.

[0003] In the face of the problem of non-constant temperature, the existing solution is to add a water storage tank at the water outlet of the gas water heater. When the water heater is turned off, hot water is pre-stored in the water storage tank. When cold water comes in for a short time, the hot water in the water storage tank neutralizes the cold water generated when the water heater is turned off and then turned on again. This overcomes the problem of the water temperature being neither too hot nor too cold during the user's bathing process to a certain extent, and at the same time improves the constant temperature effect of the hot water output.

[0004] However, when the rated hot water production capacity of the water heater increases and the water inlet and outlet volume increases, the volume of the water tank will also increase accordingly to achieve a better constant temperature effect. The water tank stores hot water, and the water temperature will drop over time, which loses the effect of warming or constant temperature. When the water heater is started again, there will be more cold water at the outlet, which also increases the waiting time for hot water.

[0005] Therefore, a gas water heater is urgently needed to solve the above problems. Summary of the invention

[0006] The present invention aims to solve at least one of the problems existing in the existing related technologies to a certain extent. To this end, the present invention proposes a gas water heater and an operating method thereof. Compared with the solution in the prior art that uses a large-capacity water storage tank to store hot water to avoid the outlet water temperature being too low, the constant temperature water tank used in the present invention is smaller in size and at the same time solves the problem that the prior art uses a large-capacity water storage tank to store hot water, which causes the user to wait longer for the hot water to flow out when using the gas water heater again because the water temperature of the hot water in the water storage tank drops to room temperature.

[0007] The above purpose is achieved through the following technical solutions:

[0008] A gas water heater, comprising:

[0009] shell;

[0010] a heat exchanger disposed in the housing;

[0011] A water pipe connected to the heat exchanger, wherein the heat exchanger is used to heat the water in the water pipe;

[0012] A flow meter, installed on the water pipe, for detecting the water flow of the water pipe;

[0013] An inlet water thermometer, arranged at the water inlet end of the water pipe, for detecting the inlet water temperature of the water pipe;

[0014] A constant temperature water tank is arranged at the water outlet of the water pipe, a heater is arranged on the constant temperature water tank, the heater can heat the water in the constant temperature water tank, and the water outlet of the constant temperature water tank is connected to a water use point;

[0015] The water outlet thermometer is installed on the constant temperature water tank and is used to detect the water temperature in the constant temperature water tank.

[0016] Optionally, the heater is an electric heater.

[0017] Optionally, the water outlet thermometer is installed at the water outlet end of the constant temperature water tank.

[0018] Optionally, a controller is further included, and the controller is installed on the housing. The flow meter, the water inlet thermometer, the heater and the water outlet thermometer are all communicatively connected to the controller.

[0019] Optionally, a heat-insulating layer is provided on the outer side of the constant-temperature water tank.

[0020] Another aspect of the present invention provides a method for operating the gas water heater as described above, comprising the following steps:

[0021] S1: The water heater is in standby mode;

[0022] S2: Determine whether the real-time water flow rate is greater than the startup water flow rate. If so, enter S3; if not, return to S1;

[0023] S3: turn off the heater, open the gas valve and ignite, and return to S2;

[0024] S4: Determine whether the real-time water flow rate is greater than the startup water flow rate. If so, return to S3. If not, close the gas valve and turn off the flame, enter the insulation mode, and enter S5.

[0025] S5: Determine whether the insulation mode lasts for a period of time t>t0. If so, return to S1; if not, enter S6;

[0026] S6: Determine whether the real-time water flow rate is greater than the startup water flow rate. If so, return to S3; if not, enter S7:

[0027] S7: Determine whether T1 < T0 - ΔT1, if so, turn on the heater and go to S8, if not, return to S4;

[0028] S8: Determine whether T1>T0+ΔT2, if so, turn off the heater and return to S5, if not, enter S9;

[0029] S9: Determine whether the real-time water flow rate is greater than the startup water flow rate. If so, return to S3; if not, return to S7;

[0030] Among them, t0 is the preset water suspension time, T1 is the real-time water temperature in the constant temperature water tank, T0 is the water outlet temperature set by the user, ΔT1 is the temperature difference of the water temperature in the constant temperature water tank allowed to drop when the user suspends water use, and ΔT2 is the temperature difference of the water temperature in the constant temperature water tank allowed to rise when the user suspends water use.

[0031] Optionally, ΔT1 = (T2 / 20°C) × K;

[0032] Wherein, T2 is the inlet water temperature, 2.5≥K≥2.

[0033] Optionally, ΔT2=(20°C / T2)×K;

[0034] Wherein, T2 is the inlet water temperature, 2.5≥K≥1.5.

[0035] Optionally, K=2.

[0036] Optionally, 3min<t0<8min.

[0037] Compared with the prior art, the present invention has at least the following beneficial effects:

[0038] The gas water heater provided by the present invention provides a constant temperature water tank at the water outlet end of the water pipe so that when the user stops using the water heater for a short period of time, the constant temperature water tank can heat the water at the water outlet end of the water pipe, thereby avoiding too low an outlet water temperature. Compared with the solution in the prior art that uses a large-capacity water storage tank to store hot water to avoid too low an outlet water temperature, the constant temperature water tank used in the present invention is smaller in size and solves the problem that a large-capacity water storage tank is used to store hot water, resulting in the user having to wait for a longer time before the hot water can flow out when the gas water heater is used again because the temperature of the hot water in the water storage tank drops to normal temperature. BRIEF DESCRIPTION OF THE DRAWINGS

[0039] Figure 1 It is a structural schematic diagram of a gas water heater provided by a specific embodiment of the present invention;

[0040] Figure 2 It is a step diagram of the operating method of the gas water heater provided by a specific embodiment of the present invention.

[0041] In the figure:

[0042] 1. Shell;

[0043] 2. Constant temperature water tank;

[0044] 3. Water outlet thermometer;

[0045] 4. Flow meter;

[0046] 5. Water inlet thermometer;

[0047] 6. Gas valve;

[0048] 7. Controller;

[0049] 8. Water pipes;

[0050] 9. Heat exchanger;

[0051] 10. Shower head. DETAILED DESCRIPTION

[0052] The following examples illustrate the present invention, but the present invention is not limited to these examples. Modifications to the specific embodiments of the present invention or equivalent replacement of some technical features without departing from the spirit of the present invention should be included in the scope of the technical solution claimed by the present invention.

[0053] Please refer to Figure 1 The present invention provides a gas water heater, including a housing 1, a heat exchanger 9, a water pipe 8, a flow meter 4, a water inlet thermometer 5, a constant temperature water tank 2 and a water outlet thermometer 3. The heat exchanger 9 is arranged in the housing 1. The water pipe 8 is connected to the heat exchanger 9, and the heat exchanger 9 is used to heat the water in the water pipe 8. The flow meter 4 is installed on the water pipe 8, and is used to detect the water flow of the water pipe 8. The water inlet thermometer 5 is arranged at the water inlet end of the water pipe 8, and is used to detect the water inlet temperature of the water pipe 8. The constant temperature water tank 2 is arranged at the water outlet end of the water pipe 8, and a heater is arranged on the constant temperature water tank 2, and the heater can heat the water in the constant temperature water tank 2, and the water outlet end of the constant temperature water tank 2 is connected to a water use point (such as a shower 10). The water outlet thermometer 3 is installed on the constant temperature water tank 2, and is used to detect the water temperature in the constant temperature water tank 2.

[0054] The gas water heater provided by the present invention is provided with a constant temperature water tank 2 at the water outlet end of the water pipe 8, so that when the user stops using the water heater for a short time, the constant temperature water tank 2 can heat the water at the water outlet end of the water pipe 8, thereby avoiding the outlet water temperature being too low. Compared with the solution in the prior art that uses a large-capacity water storage tank to store hot water to avoid the outlet water temperature being too low, the constant temperature water tank 2 used in the present invention is smaller in size and solves the problem that when a large-capacity water storage tank is used to store hot water, the user has to wait for a longer time before the hot water can flow out because the water temperature of the hot water in the water storage tank drops to normal temperature when using the gas water heater again.

[0055] Optionally, the heater is an electric heater, which has a simple structure and is easy to use. Optionally, the outlet water thermometer 3 is installed at the outlet of the thermostatic water tank 2 to obtain the water temperature in the thermostatic water tank 2 and then obtain the outlet water temperature of the gas water heater.

[0056] Optionally, a controller 7 is also included, which is installed on the shell 1. The flow meter 4, the water inlet thermometer 5, the heater and the water outlet thermometer 3 are all communicated with the controller 7 to control the operation of the heater according to the water inlet temperature, the water outlet temperature and the duration of the gas water heater being paused.

[0057] Optionally, a heat preservation layer is provided on the outer side of the constant temperature water tank 2 to reduce the excessive loss of heat in the constant temperature water tank 2 .

[0058] Please refer to Figure 2 Another aspect of the present invention provides a method for operating the gas water heater as described above, comprising the following steps:

[0059] S1: The water heater is in standby mode;

[0060] S2: Determine whether the real-time water flow rate is greater than the startup water flow rate. If so, enter S3; if not, return to S1;

[0061] S3: turn off the heater, open the gas valve 6 and ignite, and return to S2;

[0062] S4: Determine whether the real-time water flow rate is greater than the startup water flow rate. If so, return to S3. If not, close the gas valve 6 and turn off the flame, enter the insulation mode, and enter S5.

[0063] S5: Determine whether the insulation mode lasts for a duration t>t0. If so, it is determined that the user has finished bathing and the pile of the gas water heater is completely turned off. At this time, the process returns to S1. If not, it is determined that the user is in a paused bathing state. At this time, the process enters S6.

[0064] S6: Determine whether the real-time water flow rate is greater than the startup water flow rate. If so, return to S3; if not, enter S7:

[0065] S7: Determine whether T1 < T0-ΔT1. If so, it means that the real-time water temperature in the constant temperature water tank 2 is too low. At this time, turn on the heater and enter S8. If not, return to S4.

[0066] S8: Determine whether T1>T0+ΔT2. If so, it means that the real-time water temperature in the constant temperature water tank 2 is too high. At this time, turn off the heater and return to S5 to prevent the water temperature in the constant temperature water tank 2 from continuing to rise. If not, enter S9;

[0067] S9: Determine whether the real-time water flow rate is greater than the startup water flow rate. If so, return to S3; if not, return to S8;

[0068] Among them, t0 is the preset water suspension time, T1 is the real-time water temperature in the constant temperature water tank 2, T0 is the water outlet temperature set by the user, ΔT1 is the temperature difference of the water temperature in the constant temperature water tank 2 allowed to drop when the user suspends water use, and ΔT2 is the temperature difference of the water temperature in the constant temperature water tank 2 allowed to rise when the user suspends water use.

[0069] In this way, even if the user pauses the gas water heater during the entire bathing process, the water temperature will not be too low or too high when it is restarted, thereby ensuring the comfort of bathing and improving the user experience.

[0070] Generally, in winter, the temperature is low, the water temperature in the pipe is low, that is, the water inlet temperature T2 is also low; in summer, the temperature is high, the water temperature in the pipe is high, that is, the water inlet temperature T2 is also high, and the average water temperature in the pipe is generally around 20°C. In order to make the user have a more comfortable experience when bathing, the setting of ΔT1 should be determined according to the ambient temperature of the user at the time of bathing. In this embodiment, ΔT1=(T2 / 20°C)×K is set. Among them, T2 is the water inlet temperature. According to experimental data, in order to have a more comfortable water temperature, it is set to: 2.5≥K≥2. That is, when the ambient temperature is high, the temperature difference ΔT1 allowed to drop can be larger, and when the ambient temperature is low, the temperature difference ΔT1 allowed to drop should be smaller, so as to better meet the user's bathing needs.

[0071] Similarly, in order to make the user have a more comfortable experience when bathing, the setting of ΔT2 should be determined according to the ambient temperature of the user when bathing. In this embodiment, ΔT2=(20°C / T2)×K is set. According to experimental data, in order to have a more comfortable water temperature, it is set as follows: 2.5≥K≥1.5. That is, when the ambient temperature is low, the allowed temperature difference can be larger, and when the ambient temperature is high, the allowed temperature difference should be smaller, so as to better meet the user's bathing needs.

[0072] Embodiment: In this embodiment, K=2.

[0073] It should be noted that K is a coefficient set in this embodiment to balance the ambient temperature, so that the gas water heater can further adjust the water outlet temperature according to the ambient temperature.

[0074] Optionally, 3min<t0<8min.

[0075] Exemplarily, according to the time that a user normally uses bathing products such as shampoo and shower gel, t0 in this embodiment is preferably 5 minutes.

[0076] The above are only some embodiments of the present invention. For those skilled in the art, several modifications and improvements can be made without departing from the creative concept of the present invention, which all belong to the protection scope of the present invention.

Claims

1. A gas water heater, characterized in that: include: Housing (1); A heat exchanger (9) is arranged in the housing (1); A water pipe (8) connected to the heat exchanger (9), wherein the heat exchanger (9) is used to heat the water in the water pipe (8); A flow meter (4), installed on the water pipe (8), for detecting the water flow rate of the water pipe (8); An inlet water thermometer (5), arranged at the water inlet end of the water pipe (8), and used to detect the inlet water temperature of the water pipe (8); A constant temperature water tank (2) is arranged at the water outlet end of the water pipe (8), the constant temperature water tank (2) is provided with a heater, the heater can heat the water in the constant temperature water tank (2), and the water outlet end of the constant temperature water tank (2) is connected to a water use point; A water outlet thermometer (3) is installed on the constant temperature water tank (2) and is used to detect the water temperature in the constant temperature water tank (2).

2. The gas water heater according to claim 1, characterized in that: The heater is an electric heater.

3. The gas water heater according to claim 1, characterized in that: The water outlet thermometer (3) is installed at the water outlet end of the constant temperature water tank (2).

4. The gas water heater according to claim 1, characterized in that: It also includes a controller (7), which is mounted on the housing (1); the flow meter (4), the water inlet temperature meter (5), the heater and the water outlet temperature meter (3) are all connected to the controller (7) for communication.

5. The gas water heater according to any one of claims 1 to 4, characterized in that: The outer side of the constant temperature water tank (2) is provided with a heat preservation layer.

6. A method for operating a gas water heater according to any one of claims 1 to 5, characterized in that: The following steps are involved: S1: The water heater is in standby mode; S2: Determine whether the real-time water flow rate is greater than the startup water flow rate. If so, enter S3; if not, return to S1; S3: Turn off the heater, open the gas valve and ignite it, and enter the shower mode; S4: Determine whether the real-time water flow rate is greater than the startup water flow rate. If so, return to S3. If not, close the gas valve and turn off the flame, enter the insulation mode, and enter S5. S5: Determine whether the insulation mode lasts for a period of time t>t0. If so, return to S1; if not, enter S6; S6: Determine whether the real-time water flow rate is greater than the startup water flow rate. If so, return to S3; if not, enter S7: S7: Determine whether T1 < T0 - ΔT1, if so, turn on the heater and go to S8, if not, return to S4; S8: Determine whether T1>T0+ΔT2, if so, turn off the heater and return to S5, if not, enter S9; S9: Determine whether the real-time water flow rate is greater than the startup water flow rate. If so, return to S3; if not, return to S8; Among them, t0 is the preset water suspension time, T1 is the real-time water temperature in the constant temperature water tank, T0 is the water outlet temperature set by the user, ΔT1 is the temperature difference of the water temperature in the constant temperature water tank allowed to drop when the user suspends water use, and ΔT2 is the temperature difference of the water temperature in the constant temperature water tank allowed to rise when the user suspends water use.

7. The operating method of the gas water heater according to claim 6, characterized in that: ΔT1=T2 / 20℃)×K; Wherein, T2 is the inlet water temperature, 2.5≥K≥2.

8. The operating method of the gas water heater according to claim 7, characterized in that: ΔT2=20℃ / T2)×K; Wherein, T2 is the inlet water temperature, 2.5≥K≥1.

5.

9. The operating method of the gas water heater according to claim 7 or 8, characterized in that: K＝2。 10. The operating method of the gas water heater according to claim 6, characterized in that: 3min<t0<8min.

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