CN117267955A - Control method and control device of gas water heater and gas water heater - Google Patents

Abstract

The application relates to a control method and device of a gas water heater and the gas water heater. The method comprises the following steps: acquiring a set temperature, and selecting a corresponding target bypass ratio according to the set temperature; acquiring a current bypass ratio, and adjusting the current bypass ratio according to a target bypass ratio; the target bypass ratio is obtained according to the maximum bypass ratio when the water inlet temperature is the lowest temperature and the water outlet temperature of the heat exchange tube does not exceed the upper limit temperature at the set temperature. The target bypass ratio is obtained as the maximum bypass ratio when the water inlet temperature is the lowest temperature and the water outlet temperature of the heat exchange tube does not exceed the upper limit temperature at the set temperature, so that the bypass ratio of the gas water heater does not exceed the maximum bypass ratio when the current bypass ratio is adjusted according to the target bypass ratio, and the vaporization phenomenon caused by the overlarge water temperature in the heat exchange tube is reduced.

Description

Control method and control device of gas water heater and gas water heater

Technical Field

The application relates to the technical field of gas water heater control, in particular to a control method and a control device of a gas water heater and the gas water heater.

Background

In the prior art, in order to keep the temperature of the outlet water stable, a bypass mixed water constant temperature adjustment mode is often adopted for the gas water heater, and the bypass mixed water constant temperature adjustment is to mix the hot water heated by the heat exchanger with the cold water of the bypass pipe and then output the hot water with the target temperature.

The bypass mixed water constant temperature regulation scheme in the related art only considers the stability of the water outlet temperature, but does not consider the water temperature of the heat exchange tube, and the water temperature in the heat exchange tube is too high, so that vaporization phenomenon is easy to occur, and vaporization noise is formed.

Disclosure of Invention

In view of the above, it is desirable to provide a control method and a control device for a gas water heater, which can reduce the occurrence of vaporization phenomenon, and a gas water heater.

In a first aspect, the present application provides a method for controlling a gas water heater. The method comprises the following steps: acquiring a set temperature, and selecting a corresponding target bypass ratio according to the set temperature; acquiring a current bypass ratio, and adjusting the current bypass ratio according to the target bypass ratio; the target bypass ratio is obtained according to the maximum bypass ratio when the water inlet temperature is the lowest temperature and the water outlet temperature of the heat exchange tube does not exceed the upper limit temperature at the set temperature.

In one embodiment, the target bypass ratio is obtained according to a maximum bypass ratio when the water inlet temperature is the lowest temperature and the water outlet temperature of the heat exchange tube does not exceed the upper limit temperature at the set temperature, and the method comprises the following steps: the target bypass ratio is obtained according to a comparison result of a maximum bypass ratio and a preset bypass ratio when the water inlet temperature is the lowest temperature and the water outlet temperature of the heat exchange tube does not exceed the upper limit temperature at the set temperature, if the maximum bypass ratio is larger than the preset bypass ratio, the preset bypass ratio is used as the target bypass ratio, otherwise, the maximum bypass ratio is used as the target bypass ratio.

In one embodiment, before the step of selecting the corresponding target bypass ratio according to the set temperature, the method further includes: acquiring an actual water outlet temperature, and acquiring a first temperature deviation according to the actual water outlet temperature and the set temperature; and acquiring a first preset temperature range, and if the first temperature deviation is within the first preset temperature range, selecting a preset target bypass ratio according to the set temperature.

In one embodiment, the step of adjusting the current bypass ratio according to the target bypass ratio includes: obtaining bypass ratio deviation according to the target bypass ratio and the current bypass ratio; and acquiring a preset bypass ratio range, and if the bypass ratio deviation exceeds the preset bypass ratio range, adjusting the bypass ratio deviation to be within the preset bypass ratio range under the condition that the first temperature deviation does not exceed the first preset temperature range.

In one embodiment, before the step of obtaining the actual outlet water temperature, the method further includes: acquiring the water inlet temperature, the set temperature and the total water flow, and determining the load demand according to the water inlet temperature, the set temperature and the total water flow; if the load demand is within a preset load range, adjusting heating power according to the load demand and calculating the first temperature deviation; and if the load demand is out of a preset load range, adjusting the heating power to be the maximum power or the minimum power, selecting a preset target bypass ratio according to the set temperature, and adjusting the bypass ratio of the water proportional valve.

In one embodiment, after the step of selecting the preset target bypass ratio according to the set temperature to adjust the bypass ratio of the water proportional valve, the method further includes: acquiring the current water outlet temperature of the heat exchange tube; if the current heat exchange tube water outlet temperature is higher than the upper limit temperature, reducing the bypass ratio of the water proportional valve; and if the current heat exchange tube water outlet temperature is less than or equal to the upper limit temperature, maintaining the bypass ratio of the water proportional valve.

In one embodiment, the method further comprises: and if the first temperature deviation is out of the first preset temperature range, adjusting heating power and/or bypass ratio of the water proportional valve until the first temperature deviation is in the first preset temperature range.

In one embodiment, before the step of obtaining the actual outlet water temperature and obtaining the first temperature deviation according to the actual outlet water temperature and the set temperature, the method further includes: acquiring the water inlet temperature, the current bypass ratio and the water outlet temperature of the heat exchange tube, and determining and calculating the water outlet temperature according to the water inlet temperature and the current bypass ratio; acquiring a set temperature, and determining a second temperature deviation according to the calculated water outlet temperature and the set temperature; acquiring a second preset temperature range, if the second temperature deviation is within the second preset temperature range, acquiring an actual water outlet temperature, and acquiring a first temperature deviation according to the actual water outlet temperature and the set temperature.

In one embodiment, after the step of determining the second temperature deviation from the calculated outlet water temperature and the set temperature, the method further comprises: if the second temperature deviation is out of the second preset temperature range, the bypass ratio of the water proportional valve is adjusted; and after the bypass ratio of the water proportional valve is regulated, acquiring the actual water outlet temperature, and acquiring the first temperature deviation according to the actual water outlet temperature and the set temperature.

In a second aspect, the present application further provides a control device for a gas water heater. The device comprises: the bypass ratio determining module is used for acquiring a set temperature and selecting a corresponding target bypass ratio according to the set temperature; the bypass ratio adjusting module is used for acquiring a current bypass ratio and adjusting the current bypass ratio according to the target bypass ratio; the target bypass ratio is obtained according to the maximum bypass ratio when the water inlet temperature is the lowest temperature and the water outlet temperature of the heat exchange tube does not exceed the upper limit temperature at the set temperature.

In a third aspect, the present application also provides a gas water heater. The gas water heater comprises a memory and a processor, wherein the memory stores a computer program, and the processor realizes the steps of the method when executing the computer program.

According to the control method and device for the gas water heater and the gas water heater, the corresponding target bypass ratio is selected according to the set temperature of a user, and then the current bypass ratio is adjusted according to the target bypass ratio. The target bypass ratio is obtained as the maximum bypass ratio when the water inlet temperature is the lowest temperature and the water outlet temperature of the heat exchange tube does not exceed the upper limit temperature at the set temperature, so that the bypass ratio of the gas water heater does not exceed the maximum bypass ratio when the current bypass ratio is adjusted according to the target bypass ratio, and the vaporization phenomenon caused by the overlarge water temperature in the heat exchange tube is reduced.

Drawings

FIG. 1 is an application environment diagram of a control method of a gas water heater in one embodiment;

FIG. 2 is a flow chart of a method of controlling a gas water heater according to one embodiment;

FIG. 3 is a schematic flow chart of adjusting the bypass ratio according to the actual outlet water temperature in one embodiment;

FIG. 4 is a flow chart illustrating the adjustment of the bypass ratio according to the target bypass ratio in one embodiment;

FIG. 5 is a flow chart illustrating bypass ratio adjustment according to load demand in one embodiment;

FIG. 6 is a schematic flow chart of adjusting bypass ratio according to the current heat exchange tube outlet water temperature in one embodiment;

FIG. 7 is a flow chart illustrating the bypass ratio adjustment according to the calculated water temperature in one embodiment;

FIG. 8 is a flow chart illustrating a bypass ratio adjustment according to a calculated water temperature in another embodiment;

FIG. 9 is a flow chart of a control method of a gas water heater according to another embodiment;

FIG. 10 is a flow chart of a control method of a gas water heater according to yet another embodiment;

FIG. 11 is a schematic block diagram of a control device of a gas water heater according to an embodiment.

Detailed Description

In order to make the objects, technical solutions and advantages of the present application more apparent, the present application will be further described in detail with reference to the accompanying drawings and examples. It should be understood that the specific embodiments described herein are for purposes of illustration only and are not intended to limit the present application.

The control method of the gas water heater provided by the embodiment of the application can be applied to an application environment shown in fig. 1. The gas water heater comprises a heat exchanger 101, a combustor 102, a water tank temperature sensor 103, a water outlet temperature sensor 104 and a water proportional valve 105, wherein the water tank temperature sensor 103 is used for detecting the water outlet temperature of the heat exchanger 101, the water outlet temperature sensor 104 is used for detecting the water outlet temperature of the gas water heater, and the water proportional valve 105 can be a three-way water proportional valve integrating a water flow sensor and a temperature sensor and is used for respectively detecting the water inlet flow, the water inlet temperature and adjusting the bypass ratio.

In order to solve the problem of water outlet temperature fluctuation (such as caused by water quantity fluctuation, water inlet temperature fluctuation, midway start-stop and the like) generated in the using process of the gas water heater, in the related art, the water flow entering the heat exchanger 101 is adjusted by controlling the bypass ratio of the water proportional valve 105, so that the effect of stabilizing the water outlet temperature is achieved. However, when the bypass ratio is excessively adjusted, the water flow flowing into the bypass pipe becomes larger, the water flow flowing into the heat exchanger 101 becomes smaller, and because the combustion power of the burner 102 is unchanged, when the water flow in the heat exchanger 101 is excessively small, the water temperature in the heat exchange pipe is excessively high, vaporization phenomenon is generated, vaporization noise is formed, meanwhile, the risk of scale formation of the heat exchange pipe is increased, and the service life of the water tank is influenced.

Based on this, the present application proposes a control method and a control device for a gas water heater, and the gas water heater can reduce vaporization phenomenon of a heat exchange tube in the heat exchanger 101 due to overheat of water temperature.

In one embodiment, as shown in fig. 2, a control method of a gas water heater is provided, and the method is applied to the gas water heater in fig. 1 for illustration, and includes the following steps:

step S110, acquiring a set temperature, and selecting a corresponding target bypass ratio according to the set temperature.

Specifically, the user can select the water outlet temperature to be set through the user operation interface, so that the set temperature is obtained. After the set temperature is obtained, a corresponding target bypass ratio is selected according to the set temperature. The target bypass ratio is obtained according to the maximum bypass ratio when the water inlet temperature is the lowest temperature and the water outlet temperature of the heat exchange tube does not exceed the upper limit temperature at the set temperature.

The maximum bypass ratio is the bypass ratio when the water inlet temperature is the lowest temperature and the water outlet temperature of the heat exchange tube does not exceed the upper limit temperature under different setting temperatures. The minimum temperature may be the minimum water inlet temperature of a typical user's home, such as 0 degrees celsius. The upper limit temperature is the maximum allowable temperature of the heat exchange tube which just does not generate vaporization phenomenon, such as 65 ℃. It can be understood that, in general, the inlet water temperature is greater than the minimum temperature, and at this time, the bypass ratio of the heat exchange tube exceeding the upper limit temperature is also greater than the maximum bypass ratio, and by limiting the bypass ratio not greater than the maximum bypass ratio, it can be ensured that the outlet water temperature of the heat exchange tube does not exceed the upper limit temperature.

The upper limit temperature can be detected through a pre-experiment, for example, the upper limit temperature is obtained through a vaporization noise experiment, the combustion power of the burner 102 is continuously increased, the outlet water temperature of the heat exchanger is recorded, and when the vaporization noise occurs, the highest temperature before the vaporization noise occurs can be taken as the upper limit temperature. The maximum temperature before the vaporization noise of the plurality of experiments is generated may be obtained by a plurality of experiments, and the lowest temperature among the plurality of maximum temperatures is determined as the upper limit temperature. The maximum bypass ratio can be obtained through calculation, and the calculation formula is as follows:

Pmax=1-(Ts-Tj)/(Th-Tj)

wherein Pmax is the maximum bypass ratio of the bypass pipe, ts is the set temperature of the gas water heater, tj is the water inlet temperature of the gas water heater, and Th is the upper limit temperature of the heat exchange pipe.

For example, in the case where the upper limit temperature of the heat exchange tube is 66.67 degrees celsius and the inlet water temperature is 0 degrees celsius, the following table shows the maximum bypass ratio calculated in one embodiment:

step S120, obtaining a current bypass ratio, and adjusting the current bypass ratio according to the target bypass ratio.

Specifically, after the current bypass ratio of the water proportional valve 105 is obtained, the current bypass ratio is adjusted according to the magnitude relation between the target bypass ratio and the current bypass ratio. For example, if the current bypass ratio is greater than the target bypass ratio, then reducing the current bypass ratio to the target bypass ratio; if the current bypass ratio is equal to the target bypass ratio, maintaining the current bypass ratio; if the current bypass ratio is less than the target bypass ratio, the current bypass ratio is increased to the target bypass ratio.

According to the control method of the gas water heater, the corresponding target bypass ratio is selected according to the set temperature of the user, and then the current bypass ratio is adjusted according to the target bypass ratio. Since the target bypass ratio is obtained as the maximum bypass ratio when the water inlet temperature is the lowest temperature and the water outlet temperature of the heat exchange tube does not exceed the upper limit temperature at the set temperature, when the current bypass ratio is adjusted according to the target bypass ratio, the bypass ratio of the gas water heater can be adjusted to be smaller than the maximum bypass ratio, and vaporization caused by the overlarge water temperature in the heat exchange tube can be reduced.

In addition, the water outlet temperature of the heat exchanger is too high, the risk of scale formation of the heat exchange tube is also caused, and the service life of the gas water heater is reduced, so that the problem of scale formation can be considered by the upper limit temperature, for example, the upper limit temperature obtained by the vaporization noise experiment is subjected to a durability experiment to simulate the use environment of a user, the gas water heater works for 1 minute and stops for 1 minute according to the upper limit temperature, and is reciprocated for 6 ten thousand times, after the durability experiment is finished, the performances of the gas water heater still accord with national standards, and the upper limit temperature is taken as the final upper limit temperature. The risk of scale formation of the heat exchanger can be further reduced, and the service life of the gas water heater is prolonged.

In one embodiment, the target bypass ratio is obtained from a maximum bypass ratio when the inlet water temperature is the lowest temperature and the outlet water temperature of the heat exchange tube does not exceed the upper limit temperature at the set temperature, comprising:

the target bypass ratio is obtained according to a comparison result of a maximum bypass ratio and a preset bypass ratio when the water inlet temperature is the lowest temperature and the water outlet temperature of the heat exchange tube does not exceed the upper limit temperature at the set temperature, if the maximum bypass ratio is larger than the preset bypass ratio, the preset bypass ratio is taken as the target bypass ratio, otherwise, the maximum bypass ratio is taken as the target bypass ratio.

For example, the preset bypass ratio may be set to 50%, and when the maximum bypass ratio is greater than 50%, 50% is taken as the target bypass ratio, so that the subsequent bypass ratio adjustment may have a certain range of upward adjustment. When the maximum bypass ratio is 50% or less, the maximum bypass ratio is directly set as the target bypass ratio because the range of upward adjustment thereof is not large.

Specifically, a corresponding relation table of the set temperature and the target bypass ratio can be directly stored in the gas water heater, and the corresponding target bypass ratio can be directly selected according to the set temperature; the minimum temperature of the inlet water temperature, the upper limit temperature of the heat exchange tube and the preset bypass ratio can be stored in the gas water heater, the gas water heater calculates the maximum bypass ratio according to the set temperature input by a user, the stored minimum temperature and the stored upper limit temperature, and then the target bypass ratio is obtained according to the comparison result of the maximum bypass ratio and the preset bypass ratio.

In one embodiment, as shown in fig. 3, before the step of selecting the corresponding target bypass ratio according to the set temperature in step S110, the control method of the gas water heater further includes:

step S130, obtaining an actual water outlet temperature, and obtaining a first temperature deviation according to the actual water outlet temperature and the set temperature.

Specifically, the actual outlet water temperature may be detected in real time by the outlet water temperature sensor 104, and after the actual outlet water temperature is obtained, the difference between the actual outlet water temperature and the set temperature may be used as the first temperature deviation. It can be understood that the relationship between the actual water outlet temperature and the set temperature can be judged by the positive and negative of the first temperature deviation.

Step S140, a first preset temperature range is obtained, and if the first temperature deviation is within the first preset temperature range, a preset target bypass ratio is selected according to the set temperature.

Specifically, after the first temperature deviation is obtained, a first preset temperature range is obtained, wherein the first preset temperature range is the preset range size and is used for judging whether the actual water outlet temperature reaches the set temperature or not and whether the fluctuation is small or not. For example, the first preset temperature range may be [ -1,1], i.e., when the fluctuation of the difference between the actual outlet water temperature and the set temperature does not exceed 1 degree celsius, the step of selecting the preset target bypass ratio according to the set temperature in step S110 is continued. It can be understood that when the difference between the actual water outlet temperature and the set temperature of the gas water heater is within the first preset temperature range, the embodiment indicates that the current gas water heater is in a constant temperature stable state.

In one embodiment, the control method of the gas water heater further comprises: and if the first temperature deviation is out of the first preset temperature range, adjusting the heating power and/or the bypass ratio of the water proportional valve until the first temperature deviation is in the first preset temperature range.

Specifically, when the first temperature deviation is outside the first preset temperature range, it is indicated that the deviation between the actual water outlet temperature and the set temperature is larger, and at this time, in order to ensure that the actual water outlet temperature can reach the set temperature, the first temperature deviation needs to be controlled within the first preset temperature range by adjusting the heating power and/or the bypass ratio of the water proportional valve. It can be understood that after the heating power and/or the bypass ratio of the water proportional valve are/is adjusted each time, the actual water outlet temperature needs to be continuously obtained until the first temperature deviation between the actual water outlet temperature and the set temperature is within a first preset temperature range, and then the current bypass ratio is adjusted according to the target bypass ratio determined by the set temperature, so that the water outlet temperature of the heat exchange tube is prevented from exceeding the upper limit temperature. For example, when the actual water outlet temperature is smaller than the set temperature, the actual water outlet temperature can be quickly reached to the set temperature by reducing the water proportional valve and increasing the bypass ratio of the heating power, and the current bypass ratio is adjusted according to the target bypass ratio after the actual water outlet temperature reaches the constant temperature stable state.

In one embodiment, as shown in fig. 4, in step S120, the step of adjusting the current bypass ratio according to the target bypass ratio includes:

step S121, obtaining a bypass ratio deviation from the target bypass ratio and the current bypass ratio.

Specifically, after the current bypass ratio is obtained, a difference value between the current bypass ratio and the preset target bypass ratio is calculated, so that bypass ratio deviation is obtained. It is understood that the magnitude relation between the target bypass ratio and the current bypass ratio can be determined by the positive and negative of the bypass ratio deviation.

Step S122, a preset bypass ratio range is obtained, and if the bypass ratio deviation exceeds the preset bypass ratio range, the bypass ratio deviation is adjusted to be within the preset bypass ratio range under the condition that the first temperature deviation does not exceed the first preset temperature range.

Specifically, after the bypass ratio deviation is obtained, a preset bypass ratio range is obtained at the same time, wherein the preset bypass ratio range is a permissible deviation range preset by a user. For example, the preset bypass ratio range may be [0,1% ], and in the case of adjusting the bypass ratio deviation to the preset bypass ratio range, it may be ensured that the bypass ratio magnitude of the current bypass ratio smaller than the target bypass ratio is within 1%. Meanwhile, when the first temperature deviation does not exceed the first preset temperature range, the bypass ratio deviation is adjusted to be within the preset bypass ratio range, so as to prevent the outlet water temperature from fluctuating, for example, the bypass ratio can be adjusted through a fixed adjusting speed, which can be measured through a specific experiment, and the first temperature deviation does not exceed the first preset temperature range at the fixed adjusting speed.

In one embodiment, as shown in fig. 5, before the step of obtaining the actual outlet water temperature in step S130, the control method of the gas water heater further includes:

step S150, acquiring the water inlet temperature, the set temperature and the total water flow, and determining the load demand according to the water inlet temperature, the set temperature and the total water flow.

Specifically, let water temperature be Tj, set temperature be Ts, total water flow be L, at this moment load demand w= (Ts-Tj) ×l.

In step S160, if the load demand is within the preset load range, the heating power is adjusted according to the load demand and the first temperature deviation is calculated.

Specifically, the preset load range is the range of the load that the gas water heater can provide, that is, the minimum load to the maximum load that the gas water heater can provide. If the load demand is within the preset load range, it is indicated that the gas water heater can meet the load demand, and at this time, the actual outlet water temperature can be adjusted to the set temperature by adjusting the heating power, so that whether the heating power is adjusted is judged by calculating the first temperature deviation.

Step S170, if the load demand is out of the preset load range, adjusting the heating power to be the maximum power or the minimum power, and selecting a preset target bypass ratio according to the set temperature to adjust the bypass ratio of the water proportional valve.

Specifically, when the load demand is out of the preset load range, that is, the load demand is greater than the maximum load or less than the minimum load, in this case, the heating power is directly adjusted to the maximum power or the minimum power, and then the bypass ratio of the water proportional valve 105 is adjusted by selecting a preset target bypass ratio according to the set temperature, so that the actual water outlet temperature is as close to the set temperature as possible under the condition that the water outlet temperature of the heat exchange tube does not exceed the upper limit temperature.

In one embodiment, as shown in fig. 6, after the step of selecting a preset target bypass ratio according to the set temperature to adjust the bypass ratio of the water proportional valve in step S170, the method further includes:

step S171, obtaining the current water outlet temperature of the heat exchange tube;

step S172, if the current outlet water temperature of the heat exchange tube is greater than the upper limit temperature, reducing the bypass ratio of the water proportional valve;

and step S173, if the current water outlet temperature of the heat exchange tube is less than or equal to the upper limit temperature, maintaining the bypass ratio of the water proportional valve.

Specifically, when the load demand is out of the preset load range, the current bypass ratio is likely to be adjusted to a degree greater than the maximum bypass ratio in the process of adjusting the bypass ratio of the water proportional valve 105, and at this time, the current heat exchange tube outlet water temperature needs to be obtained through the water tank temperature sensor 103 in real time, so as to monitor the heat exchange tube outlet water temperature in real time. When the current heat exchange tube outlet water temperature is greater than the upper limit temperature, the bypass ratio of the water proportional valve 105 needs to be reduced to increase the water flow rate flowing into the heat exchanger 101; when the current heat exchange tube outlet water temperature is less than or equal to the upper limit temperature, the bypass ratio of the water proportional valve 105 needs to be maintained. Because the target bypass ratio is obtained through the maximum bypass ratio, and the maximum bypass ratio is obtained through the calculation of the set temperature, when the calculation is performed, the power corresponding to the set temperature is assumed to be capable of meeting the load demand of a user, and under the condition that the power corresponding to the set temperature cannot meet the load demand of the user, the target bypass ratio is likely to have a problem, so that the water outlet temperature of the heat exchange tube is higher than the upper limit temperature, and therefore, the vaporization phenomenon of the heat exchange tube in the heat exchanger 101 caused by the overheat of the water temperature is further reduced through the comparison of the water outlet temperature of the heat exchange tube and the upper limit temperature.

In one embodiment, as shown in fig. 7, in step S130, before the step of obtaining the actual outlet water temperature and obtaining the first temperature deviation according to the actual outlet water temperature and the set temperature, the control method of the gas water heater further includes:

step S131, obtaining the water inlet temperature, the current bypass ratio and the water outlet temperature of the heat exchange tube, and determining and calculating the water outlet temperature according to the water inlet temperature and the current bypass ratio.

Specifically, after the water heater is started, the water inlet temperature, the current bypass ratio and the water outlet temperature of the heat exchange tube are firstly obtained, the water inlet temperature is Tj, the current bypass ratio is Pd, the water outlet temperature of the heat exchange tube is Th, and at the moment, the water outlet temperature Tc= (Th-Tj) (1-Pd) +Tj is calculated.

Step S132, obtaining a set temperature, and determining a second temperature deviation according to the calculated water outlet temperature and the set temperature.

Specifically, after the set temperature is obtained, the second temperature deviation is determined according to the calculated difference between the water temperature and the set temperature. It can be understood that the magnitude relation between the calculated water temperature and the set temperature can be judged by the positive and negative of the second temperature deviation.

Step S133, obtaining a second preset temperature range, and if the second temperature deviation is within the second preset temperature range, obtaining an actual water outlet temperature, and obtaining a first temperature deviation according to the actual water outlet temperature and the set temperature.

Specifically, the second preset temperature range is a range preset by a user, and is used for judging whether the error between the calculated water temperature and the set temperature meets the requirement or not under the current bypass ratio. If the second temperature deviation is within the second preset temperature range, it is indicated that the calculated water temperature meets the requirement of the set temperature under the current bypass ratio, and at this time, step S130 is executed again to obtain the actual water outlet temperature, and the step of obtaining the first temperature deviation according to the actual water outlet temperature and the set temperature.

In one embodiment, as shown in fig. 8, after the step of determining the second temperature deviation according to the calculated outlet water temperature and the set temperature in step S132, the control method of the gas water heater further includes:

step S134, if the second temperature deviation is outside the second preset temperature range, the bypass ratio of the water proportional valve is adjusted.

Specifically, if the second temperature deviation is outside the second preset temperature range, it is indicated that the calculated deviation between the calculated outlet water temperature and the set temperature is large at the current bypass ratio, and at this time, the bypass ratio of the water proportional valve 105 needs to be adjusted. For example, when the calculated outlet water temperature is greater than the set temperature and the second temperature deviation is outside the second preset range, then the bypass ratio of the water ratio valve 105 needs to be increased.

And S135, after the bypass ratio of the water proportional valve is adjusted, acquiring the actual water outlet temperature, and obtaining a first temperature deviation according to the actual water outlet temperature and the set temperature.

Specifically, after the bypass ratio of the water proportional valve 105 is adjusted, in step S130, the actual outlet water temperature is obtained, and the first temperature deviation is obtained according to the actual outlet water temperature and the set temperature, so as to determine whether the actual outlet water temperature meets the set temperature.

In the following, a specific embodiment is used to describe a control method of the gas water heater in detail, as shown in fig. 9, after the gas water heater starts to work, firstly, the inlet water temperature Tj, the set temperature Ts and the total water flow L are obtained, the load demand W is calculated, when the load demand is within the preset load range, the heating power is adjusted according to the load demand, and the actual outlet water temperature Tcs is obtained after the adjustment, so as to calculate the first temperature deviation. When the first temperature deviation is in a first preset range, under the condition that the heating power is unchanged, determining a target bypass ratio Pm according to a set temperature Ts, and if the bypass ratio deviation of the current bypass ratio exceeds the preset bypass ratio range, adjusting the bypass ratio deviation to be in the preset bypass ratio range under the condition that the first temperature deviation does not exceed the first preset temperature range; when the first temperature deviation is outside the first preset range, the heating power and/or the bypass ratio of the water proportional valve can be adjusted until the first temperature deviation is within the first preset temperature range. When the gas water heater is started to work, the water inlet temperature Tj, the current bypass ratio Pd and the water outlet temperature Th of the heat exchange tube can be obtained at the same time, the water outlet temperature Tc is determined and calculated according to the water inlet temperature Tj, the second temperature deviation is calculated according to the set temperature Ts, if the second temperature deviation is in a second preset temperature range, the actual water outlet temperature is obtained, and the first temperature deviation is obtained according to the actual water outlet temperature and the set temperature; if the second temperature deviation is out of the second preset temperature range, after the bypass ratio of the water proportional valve is adjusted, the actual water outlet temperature is obtained, and the follow-up steps are executed.

As shown in fig. 10, when the calculated load demand W is outside the preset load range after the gas water heater is started to operate, adjusting the heating power to be the maximum power or the minimum power, selecting a preset target bypass ratio Pm according to the set temperature to adjust the bypass ratio of the water proportional valve, obtaining the current heat exchange tube water outlet temperature Th after the bypass ratio is adjusted, and if the current heat exchange tube water outlet temperature Th is greater than the upper limit temperature Thmax, reducing the bypass ratio of the water proportional valve until the requirement is met; and if the current heat exchange tube water outlet temperature Th is smaller than or equal to the upper limit temperature Thmax, maintaining the bypass ratio P of the water proportional valve.

It should be understood that, although the steps in the flowcharts related to the embodiments described above are sequentially shown as indicated by arrows, these steps are not necessarily sequentially performed in the order indicated by the arrows. The steps are not strictly limited to the order of execution unless explicitly recited herein, and the steps may be executed in other orders. Moreover, at least some of the steps in the flowcharts described in the above embodiments may include a plurality of steps or a plurality of stages, which are not necessarily performed at the same time, but may be performed at different times, and the order of the steps or stages is not necessarily performed sequentially, but may be performed alternately or alternately with at least some of the other steps or stages.

Based on the same inventive concept, the embodiment of the application also provides a control device of the gas water heater for realizing the control method of the gas water heater. The implementation scheme of the solution provided by the device is similar to the implementation scheme described in the above method, so the specific limitation in the embodiments of the control device of one or more gas water heaters provided below can be referred to the limitation of the control method of the gas water heater hereinabove, and will not be repeated here.

In one embodiment, as shown in fig. 11, there is provided a control device of a gas water heater, comprising: a bypass ratio determination module 210 and a bypass ratio adjustment module 220, wherein: the bypass ratio determining module 210 is configured to obtain a set temperature, and select a corresponding target bypass ratio according to the set temperature; the bypass ratio adjustment module 220 is configured to obtain a current bypass ratio, and adjust the current bypass ratio according to the target bypass ratio; the target bypass ratio is obtained according to the maximum bypass ratio when the water inlet temperature is the lowest temperature and the water outlet temperature of the heat exchange tube does not exceed the upper limit temperature at the set temperature.

In one embodiment, the target bypass ratio is obtained from a maximum bypass ratio when the inlet water temperature is the lowest temperature and the outlet water temperature of the heat exchange tube does not exceed the upper limit temperature at the set temperature, comprising: the target bypass ratio is obtained according to a comparison result of a maximum bypass ratio and a preset bypass ratio when the water inlet temperature is the lowest temperature and the water outlet temperature of the heat exchange tube does not exceed the upper limit temperature at the set temperature, if the maximum bypass ratio is larger than the preset bypass ratio, the preset bypass ratio is taken as the target bypass ratio, otherwise, the maximum bypass ratio is taken as the target bypass ratio.

In one embodiment, the control device of the gas water heater further comprises: the actual water outlet temperature response module is used for acquiring the actual water outlet temperature and obtaining a first temperature deviation according to the actual water outlet temperature and the set temperature; acquiring a first preset temperature range, and if the first temperature deviation is within the first preset temperature range, selecting a preset target bypass ratio according to the set temperature

In one embodiment, the bypass ratio adjustment module 220 is further configured to obtain a bypass ratio deviation according to the target bypass ratio and the current bypass ratio; and acquiring a preset bypass ratio range, and if the bypass ratio deviation exceeds the preset bypass ratio range, adjusting the bypass ratio deviation to be within the preset bypass ratio range under the condition that the first temperature deviation does not exceed the first preset temperature range.

In one embodiment, the control device of the gas water heater further comprises: the load response module is used for acquiring the water inlet temperature, the set temperature and the total water flow, and determining the load demand according to the water inlet temperature, the set temperature and the total water flow; if the load demand is within the preset load range, adjusting the heating power according to the load demand and calculating a first temperature deviation; and if the load demand is out of the preset load range, adjusting the heating power to be the maximum power or the minimum power, selecting a preset target bypass ratio according to the set temperature, and adjusting the bypass ratio of the water proportional valve.

In one embodiment, the control device of the gas water heater further comprises: the heat exchange tube water outlet temperature response module is used for acquiring the current heat exchange tube water outlet temperature; if the current water outlet temperature of the heat exchange tube is higher than the upper limit temperature, reducing the bypass ratio of the water proportional valve; and if the current water outlet temperature of the heat exchange tube is less than or equal to the upper limit temperature, maintaining the bypass ratio of the water proportional valve.

In one embodiment, the actual outlet water temperature response module is further configured to adjust the heating power and/or the bypass ratio of the water proportional valve if the first temperature deviation is outside the first preset temperature range until the first temperature deviation is within the first preset temperature range.

In one embodiment, the control device of the gas water heater further comprises: the calculated water outlet temperature response module is used for acquiring the water inlet temperature, the current bypass ratio and the water outlet temperature of the heat exchange tube, and determining the calculated water outlet temperature according to the water inlet temperature and the current bypass ratio; acquiring a set temperature, and determining a second temperature deviation according to the calculated water outlet temperature and the set temperature; acquiring a second preset temperature range, if the second temperature deviation is within the second preset temperature range, acquiring the actual water outlet temperature, and acquiring the first temperature deviation according to the actual water outlet temperature and the set temperature.

In one embodiment, the water outlet temperature response module is further configured to adjust a bypass ratio of the water proportional valve if the second temperature deviation is outside a second preset temperature range; and after the bypass ratio of the water proportional valve is adjusted, acquiring the actual water outlet temperature, and acquiring a first temperature deviation according to the actual water outlet temperature and the set temperature.

The above-mentioned each module in the control device of the gas water heater can be realized completely or partially by software, hardware and the combination thereof. The above modules may be embedded in hardware or may be independent of a processor in the computer device, or may be stored in software in a memory in the computer device, so that the processor may call and execute operations corresponding to the above modules.

In one embodiment, a gas water heater is provided, comprising a memory and a processor, the memory storing a computer program, the processor implementing the steps of the method embodiments described above when executing the computer program.

In one embodiment, a computer readable storage medium is provided, on which a computer program is stored, which processor implements the steps of the method embodiments described above when executing the computer program.

Those skilled in the art will appreciate that implementing all or part of the above described methods may be accomplished by way of a computer program stored on a non-transitory computer readable storage medium, which when executed, may comprise the steps of the embodiments of the methods described above. Any reference to memory, database, or other medium used in the various embodiments provided herein may include at least one of non-volatile and volatile memory. The nonvolatile Memory may include Read-Only Memory (ROM), magnetic tape, floppy disk, flash Memory, optical Memory, high density embedded nonvolatile Memory, resistive random access Memory (ReRAM), magnetic random access Memory (Magnetoresistive Random Access Memory, MRAM), ferroelectric Memory (Ferroelectric Random Access Memory, FRAM), phase change Memory (Phase Change Memory, PCM), graphene Memory, and the like. Volatile memory can include random access memory (Random Access Memory, RAM) or external cache memory, and the like. By way of illustration, and not limitation, RAM can be in the form of a variety of forms, such as static random access memory (Static Random Access Memory, SRAM) or dynamic random access memory (Dynamic Random Access Memory, DRAM), and the like. The databases referred to in the various embodiments provided herein may include at least one of relational databases and non-relational databases. The non-relational database may include, but is not limited to, a blockchain-based distributed database, and the like. The processors referred to in the embodiments provided herein may be general purpose processors, central processing units, graphics processors, digital signal processors, programmable logic units, quantum computing-based data processing logic units, etc., without being limited thereto.

The technical features of the above embodiments may be arbitrarily combined, and all possible combinations of the technical features in the above embodiments are not described for brevity of description, however, as long as there is no contradiction between the combinations of the technical features, they should be considered as the scope of the description.

The above examples only represent a few embodiments of the present application, which are described in more detail and are not to be construed as limiting the scope of the present application. It should be noted that it would be apparent to those skilled in the art that various modifications and improvements could be made without departing from the spirit of the present application, which would be within the scope of the present application. Accordingly, the scope of protection of the present application shall be subject to the appended claims.

Claims (11)

1. A method of controlling a gas water heater, the method comprising:

acquiring a set temperature, and selecting a corresponding target bypass ratio according to the set temperature;

acquiring a current bypass ratio, and adjusting the current bypass ratio according to the target bypass ratio;

the target bypass ratio is obtained according to the maximum bypass ratio when the water inlet temperature is the lowest temperature and the water outlet temperature of the heat exchange tube does not exceed the upper limit temperature at the set temperature.

2. The method of claim 1, wherein the target bypass ratio is derived from a maximum bypass ratio at which the inlet water temperature is a minimum temperature and the heat exchange tube outlet water temperature does not exceed an upper limit temperature at the set temperature, comprising:

the target bypass ratio is obtained according to a comparison result of a maximum bypass ratio and a preset bypass ratio when the water inlet temperature is the lowest temperature and the water outlet temperature of the heat exchange tube does not exceed the upper limit temperature at the set temperature, if the maximum bypass ratio is larger than the preset bypass ratio, the preset bypass ratio is used as the target bypass ratio, otherwise, the maximum bypass ratio is used as the target bypass ratio.

3. The method of claim 1, further comprising, prior to the step of selecting the corresponding target bypass ratio based on the set temperature:

acquiring an actual water outlet temperature, and acquiring a first temperature deviation according to the actual water outlet temperature and the set temperature;

and acquiring a first preset temperature range, and if the first temperature deviation is within the first preset temperature range, selecting a preset target bypass ratio according to the set temperature.

4. A method according to claim 3, wherein the step of adjusting the current bypass ratio in accordance with the target bypass ratio comprises:

obtaining bypass ratio deviation according to the target bypass ratio and the current bypass ratio;

and acquiring a preset bypass ratio range, and if the bypass ratio deviation exceeds the preset bypass ratio range, adjusting the bypass ratio deviation to be within the preset bypass ratio range under the condition that the first temperature deviation does not exceed the first preset temperature range.

5. A method according to claim 3, wherein prior to the step of obtaining the actual outlet water temperature, the method further comprises:

acquiring the water inlet temperature, the set temperature and the total water flow, and determining the load demand according to the water inlet temperature, the set temperature and the total water flow;

if the load demand is within a preset load range, adjusting heating power according to the load demand and calculating the first temperature deviation;

and if the load demand is out of a preset load range, adjusting the heating power to be the maximum power or the minimum power, selecting a preset target bypass ratio according to the set temperature, and adjusting the bypass ratio of the water proportional valve.

6. The method of claim 5, wherein after the step of selecting a preset target bypass ratio according to the set temperature to adjust the bypass ratio of the water proportional valve, further comprising:

acquiring the current water outlet temperature of the heat exchange tube;

if the current heat exchange tube water outlet temperature is higher than the upper limit temperature, reducing the bypass ratio of the water proportional valve;

and if the current heat exchange tube water outlet temperature is less than or equal to the upper limit temperature, maintaining the bypass ratio of the water proportional valve.

7. A method according to claim 3, characterized in that the method further comprises:

and if the first temperature deviation is out of the first preset temperature range, adjusting heating power and/or bypass ratio of the water proportional valve until the first temperature deviation is in the first preset temperature range.

8. A method according to claim 3, wherein, before the step of obtaining the actual outlet water temperature and obtaining the first temperature deviation from the actual outlet water temperature and the set temperature, the method further comprises:

acquiring the water inlet temperature, the current bypass ratio and the water outlet temperature of the heat exchange tube, and determining and calculating the water outlet temperature according to the water inlet temperature and the current bypass ratio;

acquiring a set temperature, and determining a second temperature deviation according to the calculated water outlet temperature and the set temperature;

acquiring a second preset temperature range, if the second temperature deviation is within the second preset temperature range, acquiring an actual water outlet temperature, and acquiring a first temperature deviation according to the actual water outlet temperature and the set temperature.

9. The method of claim 8, wherein after the step of determining a second temperature deviation from the calculated outlet water temperature and the set temperature, the method further comprises:

if the second temperature deviation is out of the second preset temperature range, the bypass ratio of the water proportional valve is adjusted;

and after the bypass ratio of the water proportional valve is regulated, acquiring the actual water outlet temperature, and acquiring the first temperature deviation according to the actual water outlet temperature and the set temperature.

10. A control device for a gas water heater, the device comprising:

the bypass ratio determining module is used for acquiring a set temperature and selecting a corresponding target bypass ratio according to the set temperature;

the bypass ratio adjusting module is used for acquiring a current bypass ratio and adjusting the current bypass ratio according to the target bypass ratio;

the target bypass ratio is obtained according to the maximum bypass ratio when the water inlet temperature is the lowest temperature and the water outlet temperature of the heat exchange tube does not exceed the upper limit temperature at the set temperature.

11. A gas water heater comprising a memory and a processor, the memory storing a computer program, characterized in that the processor, when executing the computer program, carries out the steps of the control method of a gas water heater according to any one of claims 1 to 9.