Water heater and operation method thereof

Abstract

The invention discloses a water heater and an operation method thereof, and the water heater comprises a heating structure which comprises a gas heat exchanger and an electric heater; the water pipe assembly comprises a first water pipe and a second water pipe, the first water pipe is connected with the gas heat exchanger, the second water pipe is connected with the electric heater, the water inlet end of the first water pipe and the water inlet end of the second water pipe both communicate with a water supply pipeline outside the gas water heater, and the water outlet end of the first water pipe and the water outlet end of the second water pipe both communicate with a water using pipeline; the first water quantity server is mounted at the water inlet end of the first water pipe and used for controlling the flow of water entering the first water pipe; the second water quantity server is mounted at the water inlet end of the second water pipe and used for controlling the water flow entering the second water pipe; the first flow sensor is mounted at the water inlet end of the first water pipe and used for detecting the flow of water flowing into the first water pipe through the water inlet part; the second flow sensor is mounted at the joint of the first water pipe, the second water pipe and the water supply pipeline.

Description

Technical Field

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

[0002] With the continuous progress of society and the continuous improvement of people's living standards, users have a stronger demand for a good experience in bathing. How to improve the user's bathing experience has become one of the research directions of bathing technology in the heating industry. At present, there are problems in gas water heaters that affect the user's bathing comfort as follows:

[0003] 1. When the water inlet temperature is too high in summer, the minimum temperature rise cannot meet the bathing comfort requirements;

[0004] 2. When the water inlet temperature is too low in winter, the maximum temperature rise cannot meet the bathing comfort requirements;

[0005] 3. When the water heater is shut down and restarted, it will first produce a period of high-temperature hot water. The rising water temperature will affect the comfort of bathing;

[0006] 4. When the water heater is started, due to the need to start the ignition, there will be a period of cold water in the process, and the hot water will be slow to come out, affecting the comfort of bathing.

[0007] Therefore, a water heater is needed to solve the above problems. Summary of the invention

[0008] 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 water heater that can avoid scalding users due to excessively high water outlet temperature and can also supplement the heated water volume of the water heater by adding an electric heater.

[0009] The above purpose is achieved through the following technical solutions:

[0010] A water heater, comprising:

[0011] A heating structure including a gas heat exchanger and an electric heater;

[0012] A water pipe assembly, comprising a first water pipe and a second water pipe, wherein the first water pipe is connected to the gas heat exchanger, and the second water pipe is connected to the electric heater, the water inlet end of the first water pipe and the water inlet end of the second water pipe are both connected to a water supply pipe outside the gas water heater, and the water outlet end of the first water pipe and the water outlet end of the second water pipe are both connected to a water supply pipe;

[0013] A first water flow server, installed at the water inlet end of the first water pipe, for controlling the water flow entering the first water pipe;

[0014] A second water flow servo, installed at the water inlet end of the second water pipe, for controlling the water flow entering the second water pipe;

[0015] a first flow sensor, installed at the water inlet end of the first water pipe, for detecting the water flow rate flowing into the first water pipe through the water inlet;

[0016] The second flow sensor is installed at the connection between the first water pipe, the second water pipe and the water supply pipe, and is used to detect the water flow flowing into the first water pipe and the second water pipe.

[0017] Optionally, the water pipe assembly further includes a tee, through which the water inlet end of the first water pipe and the water inlet end of the second water pipe are both connected to the water supply pipe, and the second flow sensor is installed at the port where the tee is connected to the water supply pipe.

[0018] Optionally, the first water pipe includes a first water inlet section and a first water outlet section, the water inlet end of the gas heat exchanger is connected to the water outlet end of the first water inlet section, the water outlet end of the gas heat exchanger is connected to the water inlet end of the first water outlet section, the water inlet end of the first water inlet section is connected to the first water outlet end of the tee, the second water pipe includes a second water inlet section and a second water outlet section, the water inlet end of the electric heater is connected to the water outlet end of the second water inlet section, the water outlet end of the electric heater is connected to the water inlet end of the second water outlet section, the water inlet end of the first water inlet section is connected to the first water outlet end of the tee, the water inlet end of the second water inlet section is connected to the second water outlet end of the tee, the water inlet end of the tee is connected to the water supply pipe, and the water outlet ends of the first water outlet section and the second water outlet section are both connected to the water use pipe.

[0019] Optionally, the electric heater includes a heating body and a coil wound around the heating body, the heating body is connected to electricity, one end of the coil is provided with a water inlet, and the other end is provided with a water outlet, the water inlet is connected to the water outlet end of the second water inlet section, and the water outlet is connected to the water inlet end of the second water outlet section.

[0020] Optionally, it also includes a first thermometer and a second thermometer, the first thermometer is installed at the connection between the first water pipe, the second water pipe and the water supply pipe, and is used to detect the water temperature before heating; the second thermometer is installed at the connection between the first water pipe, the second water pipe and the water use pipe, and is used to detect the water temperature after heating.

[0021] Another aspect of the present invention provides a method for operating the water heater as described above, comprising the following steps:

[0022] S1: The gas water heater is in hot standby mode;

[0023] S2: Determine whether T出 ≥T 设 +T1, if yes, adjust the second water volume servo to the first preset opening and enter S3, if no, directly enter S3;

[0024] S3: Determine whether L 实 ≥L 开机 , if yes, go to S4, if no, return to S1;

[0025] S4: Determine whether T 出 ≥T 设 +T1, if yes, go to S5, if no, go to S8;

[0026] S5: increasing the opening of the second water volume servo by n% and entering S6;

[0027] S6: Determine whether T 出 ≥T 设 +T1, if yes, go to S6, if no, go to S8;

[0028] S7: Determine whether the second water volume servo is opened to the maximum, if yes, issue a fault alarm, if no, return to S5;

[0029] S8: Turn on the gas water heater;

[0030] Among them, T 出 is the real-time outlet water temperature, T 设 is the preset water outlet temperature, T1 is the preset floating temperature, L 实 is the real-time water flow, L 开机 Start water flow to gas heat exchanger.

[0031] Optionally, T1 is 3°-7°.

[0032] Optionally, after S8, the following steps are also included:

[0033] S9: Determine whether Q 实 ≥Q 额 If yes, adjust the second water volume servo to the maximum opening and open the first water volume servo so that the total water flow reaches the preset flow rate L 设 , execute the electric auxiliary heating program and enter S10, if not, enter S12;

[0034] S10: Execute normal gas combustion heating procedure;

[0035] S11: Determine whether L 实 ≥L 开机 If yes, maintain the current working condition, if no, return to S1;

[0036] S12: Determine whether 0<Q实 ≤Q 设 , if yes, then go to S13, if no, then go to S10;

[0037] S13: Determine whether the electric auxiliary heating mode is selected. If yes, adjust the second water volume servo to the maximum opening and open the first water volume servo so that the total water flow reaches the preset flow rate L. 设 , execute the electric auxiliary heating program and enter S11;

[0038] Among them, Q 实 is the actual power required, Q 设 is the preset power, Q 额 is the rated power of the gas heat exchanger.

[0039] Optionally, Q 设 It is 3000KW.

[0040] Optionally, after S8, the following steps are also included:

[0041] S90: Determine whether Q 实 ≥Q 额 If yes, adjust the first water volume server and the second water volume server to make the total water flow rate the minimum starting total flow rate L 启动 And enter S100, if not, enter S130;

[0042] S100: Adjust the first water flow servo so that the water flow rate entering the gas heat exchanger is L 开机 ;

[0043] S110: Run the extreme heating program;

[0044] S120: Determine whether L 实 ≥L 开机 If yes, maintain the current working condition, if no, return to S1;

[0045] S130: Determine whether 0 < Q 实 ≤Q 设 If yes, then go to S140, if no, then go to S100;

[0046] S140: Determine whether the electric auxiliary heating mode is selected. If yes, adjust the second water volume servo to the maximum opening and open the first water volume servo so that the total water flow reaches the preset flow rate L. 设 , execute the electric auxiliary heating program and enter S120, if not, enter S100;

[0047] Among them, L 启动The water flow rate of the first water pipe and the second water pipe is the total water flow rate entering the first water pipe and the second water pipe, and the water flow rate allocated to the electric heater and the gas heat exchanger is the minimum water flow rate that can trigger the start-up of the electric heater and the gas heat exchanger.

[0048] Optionally, S110 includes the following steps:

[0049] S1101: Calculate Q 实 , according to k1 times Q 实 Calculate and obtain the gas flow rate q of the gas valve of the gas heat exchanger, and adjust the opening of the gas valve according to the gas flow rate q;

[0050] S1102: Determine whether T 出 =k2×T 设 If yes, then go to S1103, if no, then repeat S1102;

[0051] S1103: Increase the opening of the first water volume servo by m%, according to Q 实 Calculate the corresponding gas flow rate q1 of the gas valve, and adjust the opening of the gas valve according to the gas flow rate q1;

[0052] S1104: Determine whether Q 实 =Q 额 If yes, maintain the current working condition, if no, go to S1105;

[0053] S1105: Determine whether the first water volume servo is adjusted to the maximum opening, if yes, maintain the current working condition, if no, return to S1103;

[0054] Among them, 1<k1≤1.5, 0.8≤k2<1.

[0055] Compared with the prior art, the present invention has at least the following beneficial effects:

[0056] The water heater provided by the present invention, on the one hand, transports cold water to the electric heater for heating through the second water volume server, thereby replenishing hot water and improving the power of the water heater. On the other hand, the second water volume server provides cold water to the water heater, thereby neutralizing the hot water in the water heater, lowering the water temperature in the water heater, and avoiding excessively high water outlet temperature to scald users. The water heater has the advantages of simple and compact structure. BRIEF DESCRIPTION OF THE DRAWINGS

[0057] Figure 1 It is a structural schematic diagram of the water heater provided by the present invention;

[0058] Figure 2 It is a structural schematic diagram of the electric heater of the water heater provided by the present invention;

[0059] Figure 3It is one of the operation step diagrams of the water heater provided by the present invention;

[0060] Figure 4 This is the second operating step diagram of the water heater provided by the present invention;

[0061] Figure 5 This is the third operating step diagram of the water heater provided by the present invention.

[0062] In the figure:

[0063] 11. gas heat exchanger; 12. electric heater; 121. heating element; 122. coil; 1221. water inlet; 1222. water outlet;

[0064] 2. Water pipe assembly; 21. First water pipe; 211. First water inlet section; 212. First water outlet section; 22. Second water pipe; 221. Second water inlet section; 222. Second water outlet section; 23. Tee;

[0065] 31. First water volume server; 32. Second water volume server;

[0066] 41. A first flow sensor; 42. A second flow sensor;

[0067] 51. First thermometer; 52. Second thermometer. DETAILED DESCRIPTION

[0068] 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.

[0069] Please refer to Figure 1-Figure 2The present invention provides a water heater, comprising a heating structure, a water pipe assembly 2, a first water volume servo 31, a second water volume servo 32, a first flow sensor 41 and a second flow sensor 42. The heating structure comprises a gas heat exchanger 11 and an electric heater 12. The water pipe assembly 2 comprises a first water pipe 21 and a second water pipe 22, wherein the first water pipe 21 is connected to the gas heat exchanger 11, and the second water pipe 22 is connected to the electric heater 12. The water inlet end of the first water pipe 21 and the water inlet end of the second water pipe 22 are both connected to the water supply pipeline outside the gas water heater, and the water outlet end of the first water pipe 21 and the water outlet end of the second water pipe 22 are both connected to the water pipe. The first water volume servo 31 is installed at the water inlet end of the first water pipe 21, and is used to control the water flow entering the first water pipe 21. The second water volume servo 32 is installed at the water inlet end of the second water pipe 22, and is used to control the water flow entering the second water pipe 22. The first flow sensor 41 is installed at the water inlet end of the first water pipe 21, and is used to detect the water flow rate flowing into the first water pipe 21 through the water inlet portion 1221. The second flow sensor 42 is installed at the connection between the first water pipe 21, the second water pipe 22 and the water supply pipeline, and is used to detect the water flow rate flowing into the first water pipe 21 and the second water pipe 22.

[0070] Specifically, please refer to Figure 3 , the operation method of the water heater comprises the following steps:

[0071] S1: The gas water heater is in hot standby mode;

[0072] S2: Determine whether T 出 ≥T 设 +T1, if yes, it means that the outlet water temperature of the water heater is too high, then the second water volume servo 32 is adjusted to the first preset opening and enters S3, if no, directly enters S3;

[0073] S3: Determine whether L 实 ≥L 开机 , if yes, go to S4, if no, return to S1;

[0074] S4: Determine whether T 出 ≥T 设 +T1, if yes, go to S5, if no, go to S8;

[0075] S5: Increase the opening of the second water volume servo 32 by n% and enter S6;

[0076] S6: Determine whether T 出 ≥T 设 +T1, if yes, go to S6, if no, go to S8;

[0077] S7: Determine whether the second water volume server 32 is opened to the maximum, if yes, issue a fault alarm, if no, return to S5;

[0078] S8: Turn on the gas water heater;

[0079] Among them, T 出 is the real-time outlet water temperature, T 设 is the preset water outlet temperature, T1 is the preset floating temperature, L 实 is the real-time water flow, L 开机 is the starting water flow rate of the gas heat exchanger 11.

[0080] The water heater provided by the present invention, on the one hand, transports cold water to the electric heater 12 for heating through the second water volume servo 32, thereby replenishing hot water and improving the power of the water heater. On the other hand, the second water volume servo 32 provides cold water to the water heater, thereby neutralizing the hot water in the water heater, lowering the water temperature in the water heater, and avoiding excessively high water outlet temperature to scald the user. The water heater has the advantage of a simple and compact structure.

[0081] Optionally, T1 is 3°-7°.

[0082] Optionally, in this embodiment, n% is 10%. In other embodiments, n% may also be other values ​​between 5% and 20%.

[0083] Please refer to Figure 4 Optionally, after S8, the following steps are also included:

[0084] S9: Determine whether Q 实 ≥Q 额 If yes, adjust the second water volume servo 32 to the maximum opening, and open the first water volume servo 31 so that the total water flow reaches the preset flow rate L 设 , so that the actual total water flow reaches the startup water flow L 开机 , that is, L 设 =L 开机 , so that the water heater can be started smoothly, the electric auxiliary heating program is executed and the process goes to S10 (in this step, the electric heater is started and the gas heat exchanger 11 is not started). If not, the process goes to S12;

[0085] S10: Execute normal gas combustion heating procedure;

[0086] S11: Determine whether L 实 ≥L 开机 If yes, maintain the current working condition, if no, return to S1;

[0087] S12: Determine whether 0<Q 实 ≤Q 设 , if yes, then go to S13, if no, then go to S10;

[0088] S13: Determine whether the electric auxiliary heating mode is selected. If yes, adjust the second water volume servo 32 to the maximum opening and open the first water volume servo 31 so that the total water flow reaches the preset flow rate L. 设 , execute the electric auxiliary heating program and enter S11;

[0089] Among them, Q 实 is the actual power required, Q 设 is the preset power, Q 额 is the rated power of the gas heat exchanger 11.

[0090] Optionally, Q 设 It is 3000KW.

[0091] Optionally, after S8, the following steps are also included:

[0092] S90: Determine whether Q 实 ≥Q 额 If yes, adjust the first water volume server 31 and the second water volume server 32 so that the total water flow is the minimum starting total flow L 启动 And enter S100, if not, enter S130;

[0093] S100: Adjust the first water volume servo

[0094] 31, so that the water flow rate entering the gas heat exchanger 11 is L 开机 ;

[0095] S110: running an extremely fast heating program to achieve extremely fast heating, thereby reducing the cold water generated by restarting the water heater after it is paused;

[0096] S120: Determine whether L 实 ≥L 开机 If yes, maintain the current working condition, if no, return to S1;

[0097] S130: Determine whether 0 < Q 实 ≤Q 设 If yes, then go to S140, if no, then go to S100;

[0098] S140: Determine whether the electric auxiliary heating mode is selected. If yes, adjust the second water volume servo 32 to the maximum opening and open the first water volume servo 31 so that the total water flow reaches the preset flow rate L. 设 , execute the electric auxiliary heating program and enter S120, if not, enter S100;

[0099] Among them, L 启动The water flow rate is the total water flow entering the first water pipe 21 and the second water pipe 22, and the water flow rate allocated to the electric heater 12 and the gas heat exchanger 11 is the minimum water flow rate that can trigger the start of the electric heater 12 and the gas heat exchanger 11.

[0100] Optionally, in this embodiment, L 启动 The water flow rate L that triggers the gas heat exchanger 11 to start is 5L, and the water flow rate that triggers the electric heater 12 is 5L-3L=2L.

[0101] Please refer to Figure 5 Optionally, S110 includes the following steps:

[0102] S1101: Calculate Q 实 , according to k1 times Q 实 Calculate and obtain the gas flow rate q of the gas valve of the gas heat exchanger 11, and adjust the opening of the gas valve according to the gas flow rate q, so as to achieve rapid heating;

[0103] S1102: Determine whether Tout=k2×Tset. If so, it means that the outlet water temperature is close to the preset temperature, and then enter S1103. If not, repeat S1102.

[0104] S1103: Increase the opening of the first water volume servo 31 by m%, according to Q 实 Calculate the corresponding gas flow rate q1 of the gas valve, adjust the opening of the gas valve according to the gas flow rate q1, and gradually increase the water flow rate;

[0105] S1104: Determine whether Q 实 =Q 额 If yes, maintain the current working condition, if no, go to S1105;

[0106] S1105: Determine whether the first water volume server 31 is adjusted to the maximum opening, if yes, maintain the current working condition, if no, return to S1103;

[0107] Among them, 1<k1≤1.5, 0.8≤k2<1.

[0108] Optionally, in this embodiment, m% is 10%. In other embodiments, m% may also be other values ​​between 5% and 20%.

[0109] Optionally, the water pipe assembly 2 further includes a tee 23, the water inlet end of the first water pipe 21 and the water inlet end of the second water pipe 22 are both connected to the water supply pipe through the tee 23, and the second flow sensor 42 is installed at the port where the tee 23 is connected to the water supply pipe.

[0110] Optionally, the first water pipe 21 includes a first water inlet section 211 and a first water outlet section 212, the water inlet end of the gas heat exchanger 11 is connected to the water outlet end of the first water inlet section 211, the water outlet end of the gas heat exchanger 11 is connected to the water inlet end of the first water outlet section 212, the water inlet end of the first water inlet section 211 is connected to the first water outlet end of the tee 23, the second water pipe 22 includes a second water inlet section 221 and a second water outlet section 222, the water inlet end of the electric heater 12 is connected to the first water outlet end of the tee 23, and the second water pipe 22 includes a second water inlet section 221 and a second water outlet section 222. The water end is connected with the water outlet end of the second water inlet section 221, the water outlet end of the electric heater 12 is connected with the water inlet end of the second water outlet section 222, the water inlet end of the first water inlet section 211 is connected with the first water outlet end of the tee 23, the water inlet end of the second water inlet section 221 is connected with the second water outlet end of the tee 23, the water inlet end of the tee 23 is connected with the water supply pipe, and the water outlet end of the first water outlet section 212 and the water outlet end of the second water outlet section 222 are both connected with the water use pipe.

[0111] Optionally, the first flow sensor 41 is installed on the tee 23 , and the first flow sensor 41 is located between the first water outlet end of the tee 23 and the second water outlet end of the tee 23 , so as to detect the water flow flowing to the first water pipe 21 .

[0112] Optionally, a second flow sensor 42 is installed on the tee 23 , and the second flow sensor 42 is located between the second water outlet end of the tee 23 and the water inlet end of the tee 23 , so as to detect the water flow flowing to the first water pipe 21 and the second water pipe 22 .

[0113] Optionally, the electric heater 12 includes a heating body 121 and a coil 122 wound around the heating body 121, the heating body 121 is connected to electricity, one end of the coil 122 is provided with a water inlet 1221, and the other end is provided with a water outlet 1222, the water inlet 1221 is connected to the water outlet end of the second water inlet section 221, and the water outlet 1222 is connected to the water inlet end of the second water outlet section 222.

[0114] Optionally, it also includes a first thermometer 51 and a second thermometer 52. The first thermometer 51 is installed at the connection between the first water pipe 21, the second water pipe 22 and the water supply pipe to detect the water temperature before heating. The second thermometer 52 is installed at the connection between the first water pipe 21, the second water pipe 22 and the water use pipe to detect the water temperature after heating.

[0115] Optionally, a control display is also included, which includes buttons and a display screen. The user controls the operating program and preset temperature of the water heater through the buttons, and the display screen is used to display the real-time temperature, preset temperature and operating mode of the water heater.

[0116] Specifically, the user can choose whether to turn on the electric auxiliary heating mode by turning the knob.

[0117] 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 water heater, characterized in that: include: A heating structure comprising a gas heat exchanger (11) and an electric heater (12); A water pipe assembly (2), comprising a first water pipe (21) and a second water pipe (22), wherein the first water pipe (21) is connected to the gas heat exchanger (11), and the second water pipe (22) is connected to the electric heater (12), the water inlet end of the first water pipe (21) and the water inlet end of the second water pipe (22) are both connected to a water supply pipeline outside the gas water heater, and the water outlet end of the first water pipe (21) and the water outlet end of the second water pipe (22) are both connected to a water supply pipeline; A first water flow servo (31), installed at the water inlet end of the first water pipe (21), for controlling the water flow entering the first water pipe (21); A second water flow servo (32), installed at the water inlet end of the second water pipe (22), for controlling the water flow entering the second water pipe (22); a first flow sensor (41), installed at the water inlet end of the first water pipe (21), and used to detect the water flow rate flowing into the first water pipe (22) through the water inlet portion (23); The second flow sensor (42) is installed at the connection between the first water pipe (21), the second water pipe (22) and the water supply pipeline, and is used to detect the water flow rate flowing into the first water pipe (21) and the second water pipe (22).

2. The water heater according to claim 1, characterized in that: The water pipe assembly (2) further comprises a tee (23), the water inlet end of the first water pipe (21) and the water inlet end of the second water pipe (22) are both connected to the water supply pipeline via the tee (23), and the second flow sensor (42) is installed at the port where the tee (23) is connected to the water supply pipeline.

3. The water heater according to claim 2, characterized in that: The first water pipe (21) comprises a first water inlet section (211) and a first water outlet section (212); the water inlet end of the gas heat exchanger (11) is in communication with the water outlet end of the first water inlet section (211); the water outlet end of the gas heat exchanger (11) is in communication with the water inlet end of the first water outlet section (212); the water inlet end of the first water inlet section (211) is in communication with the first water outlet end of the tee (23); the second water pipe (22) comprises a second water inlet section (221) and a second water outlet section (222); the water inlet end of the electric heater (12) is in communication with the first water outlet end of the tee (23); The water outlet end of the electric heater (12) is connected to the water inlet end of the second water outlet section (222), the water inlet end of the first water inlet section (211) is connected to the first water outlet end of the tee (23), the water inlet end of the second water inlet section (221) is connected to the second water outlet end of the tee (23), the water inlet end of the tee (23) is connected to the water supply pipeline, and the water outlet ends of the first water outlet section (212) and the second water outlet section (212) are both connected to the water use pipeline.

4. The water heater according to claim 3, characterized in that: The electric heater (12) comprises a heating body (121) and a coil (122) wound around the heating body (121); the heating body (121) is electrically connected; one end of the coil (122) is provided with a water inlet (1221) and the other end is provided with a water outlet (1222); the water inlet (1221) is connected to the water outlet end of the second water inlet section (221); and the water outlet (1222) is connected to the water inlet end of the second water outlet section (222).

5. The water heater according to any one of claims 1 to 4, characterized in that: The invention also comprises a first thermometer (51) and a second thermometer (52), wherein the first thermometer (51) is installed at the connection between the first water pipe (21), the second water pipe (22) and the water supply pipe, and is used to detect the water temperature before heating; and the second thermometer (52) is installed at the connection between the first water pipe (21), the second water pipe (22) and the water supply pipe, and is used to detect the water temperature after heating.

6. A method for operating a water heater according to any one of claims 1 to 5, characterized in that: The following steps are involved: S1: The gas water heater is in hot standby mode; S2: Determine whether T 出 ≥T 设 +T1, if yes, adjust the second water volume servo (32) to the first preset opening and enter S3, if no, directly enter S3; S3: Determine whether L 实 ≥L 开机 , if yes, go to S4, if no, return to S1; S4: Determine whether T 出 ≥T 设 +T1, if yes, go to S5, if no, go to S8; S5: increasing the opening of the second water volume servo (32) by n% and entering S6; S6: Determine whether T 出 ≥T 设 +T1, if yes, go to S6, if no, go to S8; S7: Determine whether the second water volume servo (32) is opened to the maximum, if yes, issue a fault alarm, if no, return to S5; S8: Turn on the gas water heater; Among them, T 出 is the real-time outlet water temperature, T 设 is the preset water outlet temperature, T1 is the preset floating temperature, L 实 is the real-time water flow, L 开机 Start water flow to gas heat exchanger.

7. The method for operating a water heater according to claim 6, characterized in that: T1 is 3°-7°.

8. The method for operating a water heater according to claim 6, characterized in that: S8 also includes the following steps: S9: Determine whether Q 实 ≥Q 额 If yes, adjust the second water volume servo to the maximum opening and open the first water volume servo so that the total water flow reaches the preset flow rate L 设 , execute the electric auxiliary heating program and enter S10, if not, enter S12; S10: Execute normal gas combustion heating procedure; S11: Determine whether L 实 ≥L 开机 If yes, maintain the current working condition; if no, return to S1; S12: Determine whether 0<Q 实 ≤Q 设 , if yes, then go to S13, if no, then go to S10; S13: Determine whether the electric auxiliary heating mode is selected. If so, adjust the second water volume servo (32) to the maximum opening, and open the first water volume servo (31) so that the total water flow reaches the preset flow rate L 设 , execute the electric auxiliary heating program and enter S11; Among them, Q 实 is the actual power required, Q 设 is the preset power, Q 额 is the rated power of the gas heat exchanger (11).

9. The method for operating a water heater according to claim 8, characterized in that: Q 设 It is 3000KW.

10. The method for operating a water heater according to claim 6, characterized in that: S8 also includes the following steps: S90: Determine whether Q 实 ≥Q 额 If yes, then adjust the first water volume servo (31) and the second water volume servo (32) so that the total water flow is the minimum starting total flow L 启动 And enter S100, if not, enter S130; S100: Adjust the first water flow servo (31) so that the water flow rate entering the gas heat exchanger is L 开机 ; S110: Run the extreme heating program; S120: Determine whether L 实 ≥L 开机 If yes, maintain the current working condition; if no, return to S1; S130: Determine whether 0 < Q 实 ≤Q 设 If yes, then go to S140, if no, then go to S100; S140: Determine whether the electric auxiliary heating mode is selected. If so, adjust the second water volume servo (32) to the maximum opening, and open the first water volume servo (31) so that the total water flow reaches the preset flow rate L 设 , execute the electric auxiliary heating program and enter S120, if not, enter S100; Among them, L 启动 The water flow rate is the total water flow entering the first water pipe (21) and the second water pipe (22), and the water flow rate allocated to the electric heater (12) and the gas heat exchanger (11) is the minimum water flow rate that can trigger the start-up of the electric heater (12) and the gas heat exchanger (11).

11. The method for operating a water heater according to claim 8, characterized in that: S110 includes the following steps: S1101: Calculate Q 实 , according to k1 times Q 实 Calculate and obtain the gas flow rate q of the gas valve of the gas heat exchanger, and adjust the opening of the gas valve according to the gas flow rate q; S1102: Determine whether T 出 =k2×T 设 If yes, then go to S1103, if no, then repeat S1102; S1103: Increase the opening of the first water volume servo by m%, according to Q 实 Calculate the corresponding gas flow rate q1 of the gas valve, and adjust the opening of the gas valve according to the gas flow rate q1; S1104: Determine whether Q 实 =Q 额 If yes, maintain the current working condition, if no, go to S1105; S1105: Determine whether the first water volume servo is adjusted to the maximum opening, if yes, maintain the current working condition, if no, return to S1103; Among them, 1<k1≤1.5, 0.8≤k2<1.

Images