Method for operating a water heater and water heater

Abstract

The application discloses a running method of a water heater and the water heater. The running method of the water heater comprises the following steps: S1, starting the water heater; S2, starting the water pump of the water heater according to an initial working current I0, and running a pressure boosting mode; S3, judging whether a real-time water flow Q1 is greater than a maximum heating water flow V of a rated load of the water heater, if yes, reducing the working current of the water pump and entering S4, and if not, entering S5; S4, judging whether the water pump reaches a minimum working current I max , if yes, entering S7, and if not, returning to S3; S5, judging whether a real-time water outlet pressure P1 of the water heater is greater than a target water outlet pressure P0 of the water heater, if yes, entering S7, and if not, entering S6; S6, judging whether the water pump reaches a maximum working current I min , if yes, entering S7, and if not, increasing the working current of the water pump and returning to S3; and S7, judging whether the water heater reaches a shutdown condition, if yes, shutting down the water heater, and if not, maintaining the current working current of the water pump. max ​

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of household appliances, in particular to a running method of a water heater and the water heater. BACKGROUND

[0002] In the process of using the gas water heater, switching on between a single hot water faucet and multiple hot water faucets will cause the water flow of the water heater to change, and in turn cause the outlet water temperature of the hot water faucet to change, that is, the constancy of the outlet water temperature and the constancy of the outlet water flow cannot be guaranteed, which affects the user experience.

[0003] Therefore, there is an urgent need for a running method of a water heater to solve the above problems. SUMMARY

[0004] The present application aims to at least solve one of the problems existing in the prior art, and for this purpose, the present application proposes a running method of a water heater, which can guarantee the constancy of the outlet water temperature when a single hot water faucet is opened or multiple hot water faucets are opened, thereby ensuring the comfort of the bathing water temperature and the constancy of the outlet water flow of the hot water faucet.

[0005] The above-mentioned purpose is achieved by the following technical solutions:

[0006] A running method of a water heater, comprising the following steps:

[0007] S1: the water heater is powered on and ignited;

[0008] S2: the water pump of the water heater is started according to an initial working current I0 and runs in a pressure boosting mode;

[0009] S3: it is judged whether a real-time water flow Q1 is greater than a maximum heating water flow V max of a rated load of the water heater, if yes, the working current of the water pump is reduced and S4 is entered, if no, S5 is entered:

[0010] S4: it is judged whether the water pump reaches a minimum working current I min , if yes, S7 is entered, if no, S3 is returned;

[0011] S5: it is judged whether a real-time outlet water pressure P1 of the water heater is greater than a target outlet water pressure P0 of the water heater, if yes, S7 is entered, if no, S6 is entered;

[0012] S6: it is judged whether the water pump reaches a maximum working current I max , if yes, S7 is entered, if no, the working current of the water pump is increased and S3 is returned;

[0013] S7: judging whether the water heater reaches a shutdown condition, if yes, the water heater is shut down; if no, the water pump maintains the current working current.

[0014] Optionally, S1 and S2 further comprise S100: calculating the maximum heating water flow V max .

[0015] Optionally, the maximum heating water flow V max is calculated in real time according to the real-time water inlet temperature T1 and the preset water outlet temperature T0.

[0016] Optionally,

[0017] Wherein, Φ max is the rated heat load of the water heater; η t is the thermal efficiency of the gas; and C is the specific heat capacity of water.

[0018] Optionally, the value of P0 is calculated according to Q1 by the following method:

[0019] When Q1 < minimum water supply flow Q min , P0 = maximum target water pressure P max .

[0020] When Q1 > maximum water supply flow Q max , P0 = minimum target water pressure P min .

[0021] When Q min < Q1 < Q max ,

[0022] Optionally, the step of reducing the working current of the water pump in S3 comprises the following steps:

[0023] The working current of the water pump is reduced by I1.

[0024] Optionally, the step of increasing the working current of the water pump in S6 comprises the following steps:

[0025] The working current of the water pump is increased by I1.

[0026] Optionally, S1 further comprises the following steps before S1:

[0027] S200: the water heater is in a pressure boosting standby mode;

[0028] S300: judging whether Q1 is greater than the start-up water flow Q0, if yes, entering S1, if no, returning to S200.

[0029] Optionally, the judgment of whether the water heater reaches the shutdown condition in S7 is Q1≤Q0.

[0030] Another aspect of the present application provides a water heater operated by the operation method of the water heater.

[0031] Compared with the prior art, the present application has at least the following beneficial effects:

[0032] The operation method of the water heater provided by the present application is based on the maximum heating water flow V max of the rated load of the water heater, and adjusts the real-time water flow of the water heater to ensure the constancy of the outlet water temperature when a single hot water faucet is opened or multiple hot water faucets are opened, thereby ensuring the comfort of the bathing water temperature and the constancy of the outlet water flow of the hot water faucet, i.e., the outlet water flow of the hot water faucet can be maintained constant when multiple hot water faucets are opened or a single hot water faucet is opened. BRIEF DESCRIPTION OF DRAWINGS

[0033] Figure 1 is a flow chart of the operation steps of the water heater provided by the embodiment of the present application;

[0034] Figure 2 is a curve relationship diagram between the real-time water flow of the water heater and the target water pressure provided by the embodiment of the present application. DETAILED DESCRIPTION

[0035] The following embodiments are used to illustrate the present application, but the present application is not limited by these embodiments. Modifications to the specific embodiments of the present application or equivalent replacements to some technical features without departing from the spirit of the present application should be covered in the technical solution range claimed by the present application.

[0036] Please refer to Figure 1 and Figure 2 , the present application provides an operation method of a water heater, comprising the following steps:

[0037] S1: the water heater is powered on and ignited;

[0038] S2: the water pump of the water heater is started according to the initial working current I0 and runs in a pressure boosting mode;

[0039] S3: whether the real-time water flow Q1 is greater than the maximum heating water flow V max of the rated load of the water heater, if yes, the working current of the water pump is reduced (the water pump current is in a proportional relationship with the rotation speed, i.e., the greater the water pump current, the greater the rotation speed of the water pump) to ensure that the water entering the water heater can be heated to a preset temperature, and then S4 is entered, if not, it indicates that the water entering the water heater can be heated to a preset temperature, at this time, S5 is entered:

[0040] S4: judging whether the water pump reaches the minimum working current I min If yes, it means that the water pump speed cannot be adjusted smaller, at this time, S7 is entered, if not, S3 is returned, and the real-time water inflow Q1 is judged again;

[0041] S5: judging whether the real-time water outflow pressure P1 of the water heater is greater than the target water outflow pressure P0 of the water heater, if yes, it means that the water outflow pressure P1 is large enough, i.e. the water outflow is large enough, no matter single-point boiling water (single hot water tap boiling water) or multi-point boiling water (multiple hot water taps boiling water), at this time, S7 is entered, if not, S6 is entered;

[0042] S6: judging whether the water pump reaches the maximum working current I max If yes, it means that the water pump speed cannot be adjusted larger, at this time, S7 is entered, if not, the working current of the water pump is increased and S3 is returned, and the real-time water inflow Q1 is judged again;

[0043] S7: judging whether the water heater reaches the shutdown condition, if yes, the water heater is shut down; if not, the water pump maintains the current working current to run.

[0044] The operation method of the water heater provided by the application is based on the maximum heating water flow V max of the rated load of the water heater, the real-time water flow of the water heater is adjusted to ensure the constancy of the water temperature when a single hot water tap is opened or multiple hot water taps are opened, thereby ensuring the comfort of the bathing water temperature and the constancy of the water outflow of the hot water tap, i.e. the water outflow of the hot water tap can be maintained constant when multiple hot water taps are opened or a single hot water tap is opened.

[0045] Optionally, S100: calculating the maximum heating water flow V max of the rated load of the water heater is further included between S1 and S2.

[0046] Optionally, the maximum heating water flow V max of the rated load of the water heater is obtained in real time according to the real-time water inflow temperature T1 and the preset water outflow temperature T0.

[0047] Optionally, according to the heating water production capacity formula of the gas water heater: And, △t=T0-T1, Φ is the rated heat load Φmax, and it is derived that:

[0048]

[0049] Wherein, Φ max is the rated heat load of the water heater; η t is the thermal efficiency of the gas; and C is the specific heat capacity of water.

[0050] Alternatively, please refer to Figure 2 The value of P0 can be calculated from Q1 using the following method:

[0051] When Q1 < minimum water supply flow rate Q min At that time, P0 = maximum target water pressure P max ;

[0052] When Q1 > maximum water supply flow rate Q max At that time, P0 = minimum target water pressure P min ;

[0053] When Q min <Q1<Q max hour,

[0054] Specifically, Q min Q max P max and P min The data was obtained by sampling based on common household piping parameters (pipe diameter, pipe length, and water pressure).

[0055] For example, please refer to Figure 2 When operating in booster mode and only one hot water tap is in use, the water heater's controller adjusts the operating current of the water pump (DC pump) to ensure that the water pressure at the water heater's outlet pipe reaches P0, calculated based on the real-time water flow rate Q1. At this point, opening another hot water tap reduces the water resistance in the outlet pipe, increasing the water flow rate through the water heater to Q1. n (When multiple hot water taps are turned on, the water flow through the water heater is), but the water flow from the original hot water tap is significantly reduced. If the water pressure sensor (installed at the water outlet pipe of the water heater) measures a water pressure value lower than Q... n When the corresponding target water pressure value P0 is reached, the controller increases the operating current of the water pump, so that the water pressure at the outlet pipe reaches the new target water pressure value P0 (e.g., adjusting from point A to point B). This ensures that when the other hot water tap is also turned on, the water flow rate can maintain the original amount (the amount when a single hot water tap is turned on). In pressurization mode, when both hot water taps are in use, turning off one of the hot water taps increases the water resistance in the outlet pipe, reducing the water flow rate through the water heater to Q. m (The water flow rate through the water heater when a single hot water tap is turned on), but the water flow rate from the original hot water tap increases significantly if the water pressure sensor measures a water pressure value higher than Q. m When the corresponding target water pressure value P0 is reached, the controller reduces the operating current of the water pump, causing the water pressure at the outlet pipe to drop to the new target water pressure P0 (for example, from point D to point C), so that the water flow of the hot water faucet that is still open can maintain the original amount (the amount when both hot water faucets are open).

[0056] It should be noted that the relationship between the real-time water flow Q1 and the target water pressure value P0 in the embodiment is a straight line, of course, in other embodiments, based on the different parameters of the user's home water pipe, the relationship between the real-time water flow Q1 and the target water pressure value P0 can also be a curve.

[0057] Optionally, the step of reducing the working current of the water pump in S3 comprises the following steps:

[0058] The working current of the water pump is reduced I1, that is, the current of the water pump is gradually reduced by I1, wherein I1 can be determined according to the rated power of the water pump.

[0059] Optionally, the step of increasing the working current of the water pump in S6 comprises the following steps:

[0060] The working current of the water pump is increased I1, that is, the current of the water pump is gradually increased by I1, and I1 can also be determined according to the rated power of the water pump.

[0061] Optionally, S1 further comprises the following steps before S1:

[0062] S200: The water heater is in a pressurization standby mode;

[0063] S300: Determine whether Q1 is greater than the start-up water flow Q0, if yes, enter S1, if not, return to S200.

[0064] Optionally, the step of determining whether the water heater reaches the shutdown condition in S7 is Q1≤Q0.

[0065] Optionally, in S300, if Q1 is not greater than the start-up water flow Q0, the water heater returns to S200 after being turned off.

[0066] Optionally, the start-up water flow Q0 is 2.5L / min.

[0067] Optionally, the water heater can initially be in a bathing standby mode, when the user starts the pressurization function, the water heater enters the pressurization standby mode, and when the water heater is in the pressurization standby mode, the user turns off the pressurization function, the water heater enters the bathing standby mode.

[0068] Another aspect of the present application provides a water heater, which is operated by the above-mentioned operation method of the water heater.

[0069] The above only describes some embodiments of the present application. Those skilled in the art can make several modifications and improvements without departing from the inventive concept, and these all belong to the protection scope of the present application.

Claims

1. A method of operating a water heater, characterized by, The method comprises the following steps: S1: the water heater is started and ignited; S2: the water pump of the water heater is started according to an initial working current I0 and runs in a pressure boosting mode; S3: judging whether the real-time water flow Q1 is greater than the maximum heating water flow V of the rated load of the water heater max If yes, reducing the working current of the water pump and entering S4, if no, entering S5: S4: judging whether the water pump reaches minimum working current I min If yes, go to S7, if no, return to S3; S5: it is judged whether a real-time water outlet pressure P1 of the water heater is greater than a target water outlet pressure P0 of the water heater, if yes, S7 is entered, if not, S6 is entered; S6: judging whether the water pump reaches the maximum working current I max If yes, go to S7, if no, increase the working current of the water pump and return to S3; S7: it is judged whether the water heater reaches a shutdown condition, if yes, the water heater is shut down and extinguished, if not, the water pump maintains a current working current to run.

2. The method of operating a water heater of claim 1, wherein, The S1 and S2 further comprise S100: calculating the maximum heating water flow rate V of the water heater rated load max .

3. The method of operating a water heater of claim 2, wherein, The maximum heating water flow rate V of the water heater rated load max According to the real-time water inlet temperature T1 and the preset water outlet temperature T0.

4. The method of operating a water heater of claim 3, wherein, wherein Φ max is the rated thermal load of the water heater; η t is the thermal efficiency of the gas; and C is the specific heat capacity of water.

5. The method of operating a water heater of claim 1, wherein, The value of P0 is obtained according to Q1 by the following method: When Q1 < minimum water supply flow rate Q min P0 = maximum target water pressure P max ; When Q1> maximum water supply flow rate Q max P0= minimum target water pressure P min ; When Q min Q1 max , 6. A method of operating a water heater as claimed in any one of claims 1 to 5, wherein, The step of reducing the working current of the water pump in S3 comprises the following steps: The working current of the water pump is reduced by I1.

7. A method of operating a water heater as claimed in any one of claims 1 to 5, wherein, The step of increasing the working current of the water pump in S6 comprises the following steps: The working current of the water pump is increased by I1.

8. A method of operating a water heater as claimed in any one of claims 1 to 5, wherein, The method further comprises the following steps before S1: S200: the water heater is in a pressure boosting standby mode; S300: it is judged whether Q1 is greater than a starting water flow Q0, if yes, S1 is entered, if not, S200 is returned.

9. A method of operating a water heater as claimed in any one of claims 1 to 5, wherein, The step of judging whether the water heater reaches a shutdown condition in S7 is that Q1≤Q0.

10. A water heater, characterized by The water heater is run by the running method of any one of claims 1-9.

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