A gas water heater and a control method thereof

Abstract

The application discloses a gas water heater and a control method thereof. The control method comprises obtaining water inlet information of the gas water heater, the water inlet information comprising water inlet pressure; when the water inlet information meets a preset condition, determining a target rotating speed of a water pump according to the water inlet pressure; when the water inlet pressure is less than or equal to a first preset threshold, the smaller the water inlet pressure is, the smaller the target rotating speed is; and controlling the water pump to operate at the target rotating speed to pressurize the water flow of the gas water heater. The gas water heater and the control method thereof provided by the embodiment of the application can reduce the rotating speed of the water pump with the decrease of the water inlet pressure when the water inlet pressure is less than or equal to the first preset threshold, avoid the phenomenon that the water pump cannot suck water when the water inlet pressure is small, ensure the stability of the water inlet flow, and further avoid the problem that the water outlet temperature of the gas water heater changes suddenly with the change of the water inlet flow, so that the constant temperature effect of the water outlet is achieved.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of water heaters, in particular to a gas water heater and a control method thereof. BACKGROUND

[0002] The gas water heater is a kind of gas appliance widely used in daily life. It generates high-temperature flue gas by burning gas, and transmits heat to cold water flowing through the heat exchanger, so as to achieve the purpose of quickly heating water.

[0003] At present, the pressure boosting technology is widely used in gas water heaters. Its working principle is that when the water inlet pressure is low, the water flow is small, or the water pipe resistance in the home is too large, the water flow is small, the water pump is started to increase the water flow, and the comfort requirement of bathing is met.

[0004] When the user opens the faucet, the pressure boosting system of the existing gas water heater detects the water inlet flow, and usually controls the water pump to start running at a fixed high speed to achieve the pressure boosting effect.

[0005] When the water inlet pressure is low, the water inlet flow of the tap water is low, and the water pump starts directly at a high speed, which may cause the phenomenon of not sucking water, resulting in frequent start-stop switching of the water pump, unstable and intermittent water inlet flow, and frequent changes of the water outlet temperature during the combustion process of the gas water heater, so that the constant temperature effect cannot be achieved. SUMMARY

[0006] The present application provides a gas water heater and a control method thereof to solve the problem of high and low water outlet temperature and achieve the constant temperature effect.

[0007] According to one aspect of the present application, a control method of a gas water heater is provided, comprising:

[0008] obtaining water inlet information of the gas water heater, the water inlet information including water inlet pressure;

[0009] when the water inlet information meets a preset condition, determining a target speed of the water pump according to the water inlet pressure, wherein when the water inlet pressure is less than or equal to a first preset threshold, the smaller the water inlet pressure, the smaller the target speed;

[0010] controlling the water pump to run at the target speed to boost the water flow of the gas water heater.

[0011] Optionally, determining the target speed of the water pump according to the water inlet pressure comprises:

[0012] when the water inlet pressure is greater than the first preset threshold, the target speed is the maximum speed of the water pump.

[0013] Optionally, the water inlet information further comprises a water inlet flow rate;

[0014] When the water inlet information meets a preset condition, determining a target rotating speed of the water pump according to the water inlet pressure, comprising:

[0015] When the water inlet pressure is greater than or equal to a starting pressure threshold value, and the water inlet flow rate is greater than a starting flow rate threshold value and lasts for a first preset time length, determining the target rotating speed of the water pump according to the water inlet pressure.

[0016] Optionally, the water inlet information further comprises a water inlet flow rate;

[0017] When the water inlet information meets a preset condition, determining a target rotating speed of the water pump according to the water inlet pressure, comprising:

[0018] When an absolute value of a difference between the water inlet pressure and a historical water inlet pressure is greater than or equal to a second preset threshold value, and / or, an absolute value of a difference between the water inlet flow rate and a historical water inlet flow rate is greater than or equal to a third preset threshold value, determining the target rotating speed of the water pump according to the water inlet pressure.

[0019] Optionally, the first preset threshold value is P1, 0.28MPa≤P1≤0.32MPa.

[0020] Optionally, after controlling the water pump to operate at the target rotating speed, further comprising:

[0021] When a set rotating speed of the water pump set by a user is different from the target rotating speed, controlling the water pump to operate at the set rotating speed.

[0022] Optionally, the water inlet information further comprises a water inlet flow rate;

[0023] After controlling the water pump to operate at the set rotating speed, further comprising:

[0024] When the water inlet flow rate is less than or equal to a fourth preset threshold value and maintains a second preset time length, issuing a prompt information of adjusting the set rotating speed.

[0025] Optionally, the water inlet information further comprises a water inlet flow rate;

[0026] After acquiring the water inlet information of the gas water heater, further comprising:

[0027] When the water inlet pressure is greater than or equal to a starting pressure threshold value, and the water inlet flow rate is greater than a starting flow rate threshold value and lasts for a first preset time length, determining a target fire power of the gas water heater according to the water inlet flow rate, wherein the greater the water inlet flow rate is, the greater the target fire power is;

[0028] control the gas water heater to heat at the target fire power.

[0029] Optionally, after controlling the gas water heater to heat at the target fire power, further comprising:

[0030] obtaining a water outlet temperature of the gas water heater;

[0031] when the target fire power is the maximum fire power, the water outlet temperature is less than a set water outlet temperature and lasts for a preset time length, reducing the target rotating speed of the water pump.

[0032] According to another aspect of the present application, a gas water heater is provided, comprising a controller, a sensor assembly and a water pump;

[0033] the sensor assembly and the water pump are connected with the controller respectively;

[0034] the sensor assembly is configured to detect water inlet information of the gas water heater, the water inlet information comprising water inlet pressure;

[0035] the water pump is configured to boost the water inlet flow of the gas water heater;

[0036] the controller is configured to execute the control method of any one of claims 1-9.

[0037] The gas water heater and the control method thereof provided by the embodiments of the present application, by determining the target rotating speed of the water pump according to the water inlet pressure when the water inlet information meets the preset condition, controlling the water pump to operate at the target rotating speed to boost the water inlet flow of the gas water heater, wherein when the water inlet pressure is less than or equal to a first preset threshold, the smaller the water inlet pressure is, the smaller the target rotating speed is, so that when the water inlet pressure is small, the rotating speed of the water pump decreases with the decrease of the water inlet pressure, avoiding the phenomenon that the water pump cannot suck water when the water inlet pressure is small, ensuring the stability of the water inlet flow, and further avoiding the problem that the water outlet temperature of the gas water heater changes suddenly with the water inlet flow, achieving the constant temperature effect of the water outlet.

[0038] It should be understood that the content described in this part is not intended to identify key or important features of the embodiments of the present application, nor is it used to limit the scope of the present application. Other features of the present application will become apparent from the following description. BRIEF DESCRIPTION OF DRAWINGS

[0039] In order to more clearly illustrate the technical solutions in the embodiments of the present application, the drawings needed in the embodiment description will be briefly introduced below. Obviously, the drawings in the following description are only some embodiments of the present application, and other drawings can also be obtained by those skilled in the art without creative labor.

[0040] Figure 1 A flowchart of a control method of a gas water heater provided by an embodiment of the present application is shown in the figure.

[0041] Figure 2 A schematic diagram of a corresponding relationship between a target rotating speed and water inlet pressure provided by an embodiment of the present application is shown in the figure.

[0042] Figure 3 A schematic diagram of a corresponding relationship between a gear and a set rotating speed provided by an embodiment of the present application is shown in the figure.

[0043] Figure 4 A schematic diagram of a structure of a gas water heater provided by an embodiment of the present application is shown in the figure. DETAILED DESCRIPTION

[0044] In order to make the personnel in the technical field better understand the present application scheme, the technical scheme in the embodiments of the present application will be described clearly and completely below by combining the figures in the embodiments of the present application. Obviously, the described embodiments are only a part of the embodiments of the present application, but not all the embodiments. Based on the embodiments in the present application, all the other embodiments obtained by the personnel in the field without creative labor should belong to the protection scope of the present application.

[0045] It should be noted that the terms "first", "second" and the like in the specification and claims of the present application and the above-mentioned figures are used to distinguish similar objects, and do not necessarily indicate a specific order or sequence. It should be understood that the data thus used can be interchanged under appropriate circumstances, so that the embodiments of the present application described herein can be implemented in an order other than that illustrated or described herein. In addition, the terms "include" and "have" and any variations thereof are intended to cover non-exclusive inclusion, for example, a process, method, system, product or device including a series of steps or units does not necessarily have to be limited to those steps or units clearly listed, but can include other steps or units not clearly listed or inherent to these processes, methods, products or devices.

[0046] Figure 1 A flowchart of a control method of a gas water heater provided by an embodiment of the present application is shown in the figure. The embodiment can be applicable to the use of a gas water heater. The method can be executed by a control device of the gas water heater. The control device can be realized in the form of hardware and / or software. The control device can be configured in a controller of the gas water heater.

[0047] As shown in the figure, the control method comprises: Figure 1

[0048] S110, obtaining water inlet information of the gas water heater, the water inlet information comprising water inlet pressure. ​

[0049] The water inlet information is obtained by detecting the water flow of the gas water heater, and specifically, the sensor assembly is connected to the controller of the gas water heater, and the sensor assembly is used to detect the water flow of the gas water heater to obtain the water inlet information and send it to the controller.

[0050] Specifically, after the user starts the gas water heater, the controller controls the sensor assembly to detect the water inlet information of the water flow of the gas water heater.

[0051] The specific type and collection position of the water inlet information are not unique, and the sensor assembly can collect the water inlet information from the water inlet pipe of the heat exchanger in the gas water heater, but is not limited thereto. For example, the water inlet information can include water inlet pressure, water inlet flow rate, and water inlet temperature, and correspondingly, the sensor assembly can include a water inlet pressure sensor, a water inlet flow rate sensor, and a water inlet temperature sensor, etc. The water inlet pressure sensor is used to monitor the water inlet pressure of the gas water heater in real time, the water inlet flow rate sensor is used to monitor the water inlet flow rate of the gas water heater in real time, and the water inlet temperature sensor is used to monitor the water inlet temperature of the gas water heater in real time.

[0052] The sensor assembly can also collect water outlet information from the water outlet pipe of the heat exchanger in the water heater, and the water outlet information can include water outlet temperature, etc., which is not limited in the embodiment of the application.

[0053] S120, when the water inlet information meets the preset condition, determining the target rotating speed of the water pump according to the water inlet pressure, wherein when the water inlet pressure is less than or equal to a first preset threshold, the smaller the water inlet pressure is, the smaller the target rotating speed is.

[0054] S130, controlling the water pump to operate at the target rotating speed to boost the water flow of the gas water heater.

[0055] The water pump can be arranged on the water inlet pipeline of the gas water heater to boost the water flow of the gas water heater. The controller of the gas water heater is connected to the water pump to control the water pump to start operating at the target rotating speed.

[0056] When the water inlet information meets the preset condition, the water inlet pressure is used as a reference basis for boosting and adjusting the water flow of the gas water heater, the target rotating speed of the water pump is determined, and the water pump is controlled to operate at the target rotating speed, so that the water flow of the gas water heater meets the user's bathing demand.

[0057] When the water inlet pressure is less than or equal to the first preset threshold P1, if the target rotating speed is directly set as the high rotating speed, the water pump will not suck water when starting, which causes the water inlet flow to be intermittent, and the water outlet temperature of the gas water heater will be high and low suddenly during the combustion process, so that the constant temperature effect cannot be achieved.

[0058] In the embodiment, when the water inlet pressure is less than or equal to the first preset threshold P1, the target rotating speed is set to decrease with the decrease of the water inlet pressure, so that the water pump pressurizes the water inlet flow at a lower target rotating speed when the water inlet pressure is low, the phenomenon that the water pump does not suck water when starting is avoided, the water inlet flow is stable, and the problem that the water outlet temperature of the gas water heater is high and low suddenly due to the sudden change of the water inlet flow is avoided, and the constant temperature effect of the water outlet is achieved.

[0059] The specific value of the first preset threshold P1 is not unique, and can be adjusted according to actual conditions.

[0060] Meanwhile, when the water inlet pressure is less than or equal to the first preset threshold P1, the corresponding relationship between the target rotating speed and the water inlet pressure can also be set according to actual needs.

[0061] Specifically, in an embodiment, the water inlet pressure can be divided into a plurality of water inlet pressure intervals, each water inlet pressure interval corresponds to a target rotating speed value, and the corresponding relationship between the water inlet pressure interval and the target rotating speed value is stored in the controller. When the controller determines the target rotating speed of the water pump according to the water inlet pressure, the corresponding target rotating speed value is determined according to the water inlet pressure interval in which the water inlet pressure is located, through the stored corresponding relationship between the water inlet pressure interval and the target rotating speed value. The corresponding relationship between the water inlet pressure interval and the target rotating speed value can be stored in the form of a table, and at this time, the controller can determine the target rotating speed value corresponding to the water inlet pressure by table lookup, but is not limited thereto.

[0062] Table 1 illustrates a corresponding relationship between a target rotating speed and a water inlet pressure in a feasible implementation manner.

[0063] Table 1 corresponding relationship between target rotating speed and water inlet pressure

[0064]

[0065] As shown in Table 1, for example, when the first preset threshold P1 is 0.3 MPa, when the water inlet pressure is between 0.02 MPa and 0.039 MPa, the target speed is determined to be 2000 r / min; when the water inlet pressure is between 0.04 MPa and 0.059 MPa, the target speed is determined to be 2500 r / min; when the water inlet pressure is between 0.06 MPa and 0.079 MPa, the target speed is determined to be 3000 r / min; when the water inlet pressure is between 0.08 MPa and 0.099 MPa, the target speed is determined to be 3500 r / min; when the water inlet pressure is between 0.10 MPa and 0.149 MPa, the target speed is determined to be 4000 r / min; when the water inlet pressure is between 0.15 MPa and 0.199 MPa, the target speed is determined to be 4500 r / min; when the water inlet pressure is between 0.25 MPa and 0.249 MPa, the target speed is determined to be 5000 r / min; when the water inlet pressure is between 0.04 MPa and 0.299 MPa, the target speed is determined to be 5500 r / min; and when the water inlet pressure is 0.3 MPa, the target speed is determined to be 6000 r / min. Thus, when the water inlet pressure is less than or equal to 0.3 MPa, the target speed decreases with the decrease of the water inlet pressure, avoiding the phenomenon that the water pump runs at a high speed when the water inlet pressure is low, ensuring the stability of the water inlet flow, and further solving the problem that the water outlet temperature of the gas water heater changes suddenly with the water inlet flow, achieving the constant temperature effect of the water outlet.

[0066] It should be noted that the correspondence between the target speed and the water inlet pressure is not unique, and can be adjusted according to actual conditions.

[0067] In another embodiment, a preset formula can be set between the water inlet pressure and the target speed value, and the preset formula is stored in the controller. When the controller determines the target speed of the water pump according to the water inlet pressure, the corresponding target speed value is calculated according to the water inlet pressure and the preset formula.

[0068] For example, Figure 2 A schematic diagram of the correspondence between the target speed and the water inlet pressure provided by the embodiment of the present application is shown in FIG. 1. Figure 2 As shown in FIG. 1, when the water inlet pressure is less than or equal to the first preset threshold P1, the target speed R increases with the increase of the water inlet pressure P, and the target speed R and the water inlet pressure P can satisfy R=k*P+A. Figure 2As shown, taking 0.3 MPa as an example of the first preset threshold P1, k = 4000 / 0.28, and A = 6000-(4000 / 0.28)*0.3, when the controller determines the target rotating speed of the water pump according to the water inlet pressure, the controller calculates the corresponding target rotating speed value according to the water inlet pressure P and the formula R = k*P+A, so that when the water inlet pressure is less than or equal to 0.3 MPa, the target rotating speed decreases with the decrease of the water inlet pressure, avoiding the phenomenon that the water pump cannot suck water when the water inlet pressure is low, ensuring the stability of the water inlet flow, and further solving the problem that the outlet water temperature of the gas water heater changes suddenly with the water inlet flow, and achieving the constant temperature effect of the outlet water.

[0069] The preset formula satisfied by the water inlet pressure and the target rotating speed value is not unique and can be adjusted according to actual conditions.

[0070] It should be noted that in the above-mentioned condition that the water inlet information satisfies the preset condition, the preset condition can be set according to actual needs, for example, in an embodiment, the water inlet information includes the water inlet flow, and the preset condition is that the water inlet flow is greater than or equal to a starting flow threshold, that is, when the water inlet flow of the gas water heater is greater than or equal to the starting flow threshold, the target rotating speed of the water pump is determined according to the water inlet pressure, and the water pump is controlled to start running at the target rotating speed, thereby avoiding the continuous idling of the water pump without water, causing damage to the water pump.

[0071] The specific value of the starting flow threshold is not unique and can be adjusted according to actual conditions.

[0072] In another embodiment, the preset condition can also be that the gas water heater is in an open state, that is, after the user opens the gas water heater, the sensor assembly continuously detects the water inlet information of the gas water heater, and the controller obtains the water inlet information detected by the sensor assembly in real time, thereby monitoring the change of the water inlet flow in real time, and automatically adjusting the target rotating speed of the water pump according to the current water inlet pressure, and further automatically adjusting the rotating speed of the water pump to a low rotating speed when the water inlet pressure is low, thereby ensuring the stability of the water inlet flow of the gas water heater and meeting the user's bathroom needs, but not limited thereto.

[0073] In summary, the control method of the gas water heater provided in the embodiments of the present application determines the target rotating speed of the water pump according to the water inlet pressure when the water inlet information satisfies the preset condition, and controls the water pump to run at the target rotating speed to pressurize the water inlet flow of the gas water heater, wherein when the water inlet pressure is less than or equal to the first preset threshold, the smaller the water inlet pressure, the smaller the target rotating speed, so that when the water inlet pressure is low, the rotating speed of the water pump decreases with the decrease of the water inlet pressure, avoiding the phenomenon that the water pump cannot suck water when the water inlet pressure is low, ensuring the stability of the water inlet flow, and further avoiding the problem that the outlet water temperature of the gas water heater changes suddenly with the water inlet flow, and achieving the constant temperature effect of the outlet water.

[0074] Optionally, the target rotating speed of the water pump is determined according to the water inlet pressure, comprising:

[0075] When the water inlet pressure is greater than the first preset threshold, the target rotating speed is the maximum rotating speed of the water pump.

[0076] Specifically, when the water inlet pressure is greater than the first preset threshold P1, that is, when the water inlet pressure is relatively large, the water pump sets the target rotating speed as the high rotating speed, and no phenomenon of not sucking water occurs. At this time, by setting the target rotating speed as the maximum rotating speed of the water pump, the water pump is controlled to operate at the maximum rotating speed, so as to fully boost the water flow of the gas water heater, improve the water outlet flow, and meet the user's bathing comfort requirement.

[0077] Optionally, the water inlet information further comprises a water inlet flow.

[0078] When the water inlet information meets the preset condition, the target rotating speed of the water pump is determined according to the water inlet pressure, comprising:

[0079] When the water inlet pressure is greater than or equal to the starting pressure threshold, the water inlet flow is greater than or equal to the starting flow threshold and lasts for the first preset time length, the target rotating speed of the water pump is determined according to the water inlet pressure.

[0080] Among them, the water inlet information comprises a water inlet flow, and the preset condition is that the water inlet pressure is greater than or equal to the starting pressure threshold, the water inlet flow is greater than or equal to the starting flow threshold and lasts for the first preset time length, that is, when the water inlet pressure of the gas water heater is greater than or equal to the starting pressure threshold, the water inlet flow is greater than the starting flow threshold and lasts for the first preset time length, the target rotating speed of the water pump is determined according to the water inlet pressure, and the water pump is controlled to start operating at the target rotating speed, so as to avoid the water pump from continuously idling without water, causing damage to the water pump.

[0081] And when the water inlet pressure is less than the starting pressure threshold, the water inlet flow is less than the starting flow threshold, or the water inlet flow is greater than or equal to the starting flow threshold but does not last for the first preset time length, it indicates that the current water inlet flow cannot meet the normal work of the gas water heater, at this time, the water pump is controlled not to start.

[0082] Among them, the starting pressure threshold, the starting flow threshold and the first preset time length can be set according to actual needs, for example, the starting pressure threshold is 0.02MPa, the starting flow threshold is 0, and the first preset time length is 1 second, that is, when the water inlet pressure is greater than or equal to 0.02MPa, the water inlet flow is greater than 0 and lasts for 1 second, the controller determines the target rotating speed of the water pump according to the water inlet pressure, and starts the water pump at the target rotating speed to open the boosting function, so as to ensure the stability of the water inlet flow.

[0083] It should be noted that the specific values of the starting pressure threshold, the starting flow threshold and the first preset time length are not unique, and can be adjusted according to actual conditions.

[0084] Optionally, the water inlet information further comprises a water inlet flow.

[0085] When the water inlet information meets a preset condition, a target rotating speed of the water pump is determined according to the water inlet pressure, comprising:

[0086] When an absolute value of a difference between the water inlet pressure and a historical water inlet pressure is greater than or equal to a second preset threshold, or an absolute value of a difference between the water inlet flow and a historical water inlet flow is greater than or equal to a third preset threshold, the target rotating speed of the water pump is determined according to the water inlet pressure.

[0087] Specifically, when the gas water heater is used for the first time after installation, the controller can automatically obtain the current water inlet information of the user's home through the sensor assembly, and automatically match the target rotating speed of the water pump according to the water inlet pressure, and control the water pump to run at the target rotating speed, so as to pressurize the water inlet flow of the gas water heater, wherein when the water inlet pressure is less than or equal to the first preset threshold, the smaller the water inlet pressure is, the smaller the target rotating speed is, so that when the water inlet pressure is small, the rotating speed of the water pump decreases with the decrease of the water inlet pressure, avoiding the phenomenon that the water pump cannot suck water when the water inlet pressure is small, ensuring the stability of the water inlet flow, and further avoiding the problem that the water outlet temperature of the gas water heater changes suddenly with the change of the water inlet flow, achieving the effect of constant temperature of the water outlet, and meeting the user's demand for bathing comfort.

[0088] After controlling the water pump to run at the target rotating speed, the controller stores the current water inlet pressure, water inlet flow and target rotating speed of the water pump as the historical water inlet pressure, historical water inlet flow and historical rotating speed, and when the gas water heater is started again, the water pump can be directly controlled to run at the historical rotating speed, so as to achieve the effect of quickly starting the water pump.

[0089] When the gas water heater is started again, the preset condition can be that the absolute value of the difference between the water inlet pressure and the historical water inlet pressure is greater than or equal to the second preset threshold, and / or the absolute value of the difference between the water inlet flow and the historical water inlet flow is greater than or equal to the third preset threshold, that is, when the absolute value of the difference between the water inlet pressure and the historical water inlet pressure of the gas water heater is greater than or equal to the second preset threshold, and / or the absolute value of the difference between the water inlet flow and the historical water inlet flow is greater than or equal to the third preset threshold, the target rotating speed of the water pump is determined again according to the current water inlet pressure, and the water pump is controlled to run at the target rotating speed, so as to adjust the rotating speed of the water pump when the water inlet flow changes greatly, ensuring the stability of the water inlet flow, and avoiding the rotating speed of the water pump from being adjusted too frequently, in addition, after the target rotating speed of the water pump is determined again, the controller stores the current water inlet pressure, water inlet flow and target rotating speed of the water pump as the historical water inlet pressure, historical water inlet flow and historical rotating speed, so as to update the stored historical water inlet pressure, historical water inlet flow and historical rotating speed.

[0090] When the gas water heater is started next time, the water pump can be directly controlled to run at the last stored historical rotating speed to achieve the effect of quickly starting the water pump.

[0091] The second preset threshold and the third preset threshold can be set according to actual needs, for example, the second preset threshold is 0.05 MPa, and the third preset threshold is 2 L / min, that is, when the absolute value of the difference between the water inlet pressure and the historical water inlet pressure is greater than or equal to 0.05 MPa, and / or the absolute value of the difference between the water inlet flow and the historical water inlet flow is greater than or equal to 2 L / min, the controller determines the target rotating speed of the water pump according to the water inlet pressure, and controls the water pump to run at the target rotating speed, thereby ensuring the stability of the water inlet flow.

[0092] It should be noted that the specific values of the second preset threshold and the third preset threshold are not unique and can be adjusted according to actual conditions.

[0093] Optionally, the first preset threshold is P1, and 0.28 MPa≤P1≤0.32 MPa.

[0094] The first preset threshold P1 is set reasonably to ensure that the target rotating speed of the water pump decreases with the decrease of the water inlet pressure in a suitable water inlet pressure range, thereby ensuring that the water pump pressurizes the water inlet flow at a lower target rotating speed when the water inlet pressure is low, avoiding the phenomenon that the water pump cannot suck water when the water inlet pressure is low, ensuring the stability of the water inlet flow, and further avoiding the problem that the outlet water temperature of the gas water heater suddenly changes with the sudden change of the water inlet flow, thereby achieving the constant temperature effect of the outlet water.

[0095] In an embodiment, the first preset threshold P1 is 0.3 MPa, but is not limited thereto. It can be understood that the specific value of the first preset threshold P1 is not unique and can be adjusted according to actual conditions.

[0096] Optionally, after the water pump is controlled to run at the target rotating speed, the method further comprises:

[0097] When the set rotating speed of the water pump set by the user is different from the target rotating speed, the water pump is controlled to run at the set rotating speed.

[0098] Specifically, the user can input the set rotating speed of the water pump according to actual water demand, and after the controller receives the set rotating speed set by the user, if the set rotating speed of the water pump set by the user is different from the target rotating speed, the water pump is controlled to run at the set rotating speed, so that the water inlet flow meets the actual water demand of the user.

[0099] The user can input the set rotating speed of the water pump through the key plate of the gas water heater.

[0100] For example, the key plate of the gas water heater is provided with five gear keys, which respectively represent first gear, second gear, third gear, fourth gear and fifth gear. Each gear key corresponds to a different set speed value of the water pump. The higher the gear, the higher the corresponding set speed. For example, Figure 3 A schematic diagram of the correspondence between the gear and the set speed provided by the embodiment of the present application is shown in FIG. 1. The set speed corresponding to the first gear is 2000 r / min, the set speed corresponding to the second gear is 3000 r / min, the set speed corresponding to the third gear is 4000 r / min, the set speed corresponding to the fourth gear is 5000 r / min, and the set speed corresponding to the fifth gear is 6000 r / min. The user can set the corresponding set speed by pressing different gear keys according to his own water use habits. Figure 3

[0101] It should be noted that the above embodiment only takes the example that the higher the gear, the higher the corresponding set speed. The number of gear keys and the set speed corresponding to each gear key can be adjusted according to actual conditions, and the embodiment of the present application does not make specific limitations on this.

[0102] In addition, the input method of the set speed is not unique and can be adjusted according to actual conditions.

[0103] Optionally, the water inlet information further includes a water inlet flow.

[0104] After controlling the water pump to operate at the set speed, the method further includes:

[0105] When the water inlet flow is less than or equal to a fourth preset threshold and is maintained for a second preset time length, a prompt information of adjusting the set speed is sent.

[0106] When the water inlet pressure is small and the set speed set by the user is a high speed, the water pump may not be able to suck water when it starts, resulting in intermittent water inlet flow. During the combustion process of the gas water heater, the sudden change of the water inlet flow may cause the outlet water temperature to be high and low alternately, so that the constant temperature effect cannot be achieved.

[0107] In the embodiment, the fourth preset threshold can be 0 or a small value, and the second preset time length can be 1 second or a shorter time. After controlling the water pump to operate at the set speed, if the water inlet flow is less than or equal to the fourth preset threshold and is maintained for the second preset time length, it indicates that the water pump operates at the set speed and there is an idle running situation because it cannot suck water. At this time, the prompt information of adjusting the set speed is sent to prompt the user to modify the set speed, so as to ensure the stability of the water inlet flow and avoid the situation that the outlet water temperature is high and low alternately.

[0108] It should be noted that the specific values of the fourth preset threshold and the second preset time length are not unique and can be adjusted according to actual conditions. ​

[0109] It should be noted that the manner of issuing the prompt information of the adjusted setting speed can adopt voice prompt, display screen prompt, indicator light prompt, etc., and the embodiments of the present application do not make specific limitation thereon.

[0110] Optionally, the water inlet information further includes water inlet flow.

[0111] After the water inlet information of the gas water heater is acquired, the method further includes:

[0112] When the water inlet pressure is greater than or equal to the starting pressure threshold, the water inlet flow is greater than or equal to the starting flow threshold and lasts for a first preset time length, the target fire of the gas water heater is determined according to the water inlet flow, wherein the greater the water inlet flow is, the greater the target fire is.

[0113] The gas water heater is controlled to heat at the target fire.

[0114] The water inlet information includes water inlet flow, when the water inlet pressure of the gas water heater is greater than or equal to the starting pressure threshold, the water inlet flow is greater than the starting flow threshold and lasts for a first preset time length, the target fire of the gas water heater is determined according to the water inlet flow, and the gas water heater is controlled to heat at the target fire, so as to heat under the condition that the water inlet flow of the gas water heater is sufficient, and to avoid the problem of excessively high outlet water temperature.

[0115] When the water inlet pressure is less than the starting pressure threshold, the water inlet flow is less than the starting flow threshold, or the water inlet flow is greater than or equal to the starting flow threshold but does not last for the first preset time length, it indicates that the current water inlet flow cannot meet the normal work of the gas water heater, at this time, the gas water heater is controlled not to start combustion, and the gas water heater is in standby state.

[0116] The starting pressure threshold, the starting flow threshold and the first preset time length can be set according to actual needs, for example, the starting pressure threshold is 0.02 MPa, the starting flow threshold is 0, and the first preset time length is 1 second, that is, when the water inlet pressure is greater than or equal to 0.02 MPa, the water inlet flow is greater than 0 and lasts for 1 second, the controller determines the target fire of the gas water heater according to the water inlet flow, and ignites the gas water heater to start combustion to heat the water inlet flow at the target fire, so as to achieve the purpose of outlet hot water.

[0117] It should be noted that the specific values of the starting pressure threshold, the starting flow threshold and the first preset time length are not unique, and can be adjusted according to actual conditions.

[0118] Further, the target fire of the gas water heater is determined based on the water inlet flow, and the greater the water inlet flow is, the greater the target fire is, so as to stabilize the outlet water temperature of the gas water heater at the set outlet water temperature set by the user, and to achieve the effect of constant temperature.

[0119] In addition, the target firepower of the gas water heater can also be determined based on the set outlet water temperature, and the higher the set outlet water temperature, the greater the target firepower, so that the outlet water temperature of the gas water heater reaches the set outlet water temperature for constant temperature water outlet.

[0120] For example, when the water inlet pressure of the gas water heater is greater than or equal to the starting pressure threshold, the water inlet flow is greater than the starting flow threshold and lasts for a first preset duration, the controller determines the target rotating speed of the water pump according to the water inlet pressure, and controls the water pump to start the pressure boosting function at the target rotating speed, so as to automatically adjust the target rotating speed of the water pump according to the current water inlet pressure, and ensure the stability of the water inlet flow. At the same time, the controller determines the target firepower according to the set outlet water temperature set by the user and the water inlet flow after pressure boosting, and controls the gas water heater to ignite and burn at the target firepower, so as to automatically adjust the target firepower of the gas water heater according to the current water inlet flow and the set outlet water temperature, and achieve constant temperature effect.

[0121] In an embodiment, the water inlet information further includes water inlet temperature, and the controller can further analyze the energy required to heat water at the water inlet flow according to the relationship between the set outlet water temperature and the water inlet temperature, and then calculate the target firepower to ensure that the outlet water temperature reaches the set outlet water temperature set by the user, and achieve the effect of constant temperature water outlet.

[0122] The target firepower represents the heating power of the gas water heater.

[0123] The heat exchanger of the gas water heater is connected to the burner, the gas proportional valve is connected to the gas inlet end of the burner, and when the gas water heater is heating, the gas enters the burner through the gas proportional valve to ignite, and the burner generates high-temperature flue gas by burning the gas, and the heat is transferred to the cold water flowing through the heat exchanger. The cold water flowing through the heat exchanger absorbs heat and is heated to become hot water flowing out of the gas water heater, achieving the purpose of hot water outlet.

[0124] The heating power can be controlled by adjusting the opening of the gas proportional valve, so as to achieve the target firepower.

[0125] Optionally, after controlling the gas water heater to heat at the target firepower, the method further comprises:

[0126] Obtaining the outlet water temperature of the gas water heater.

[0127] When the target firepower is the maximum firepower, the outlet water temperature is less than the preset temperature and lasts for a preset duration, the target rotating speed of the water pump is reduced.

[0128] The sensor assembly of the gas water heater can also collect outlet water information such as outlet water temperature from the outlet water pipe of the heat exchanger inside the water heater.

[0129] When the target fire reaches the maximum fire of the gas water heater, for example, the opening of the gas proportional valve has reached the maximum, and the outlet water temperature is less than the set outlet water temperature input by the user and lasts for a preset time length, it indicates that the rated load of the gas water heater cannot reach the set outlet water temperature required by the user under the current large inlet water flow, at this time, the controller automatically reduces the target rotating speed of the water pump, thereby reducing the inlet water flow, so that the outlet water temperature can reach the set outlet water temperature set by the user for constant temperature water outlet, and the temperature requirement of the user for water use is met.

[0130] Based on the same inventive concept, the embodiment of the present application also provides a gas water heater, Figure 4 A structural schematic diagram of a gas water heater provided by the embodiment of the present application is shown in Figure 4 The gas water heater comprises a controller 10, a sensor assembly 11 and a water pump 12, the sensor assembly 11 and the water pump 12 are connected with the controller 10 respectively, the sensor assembly 11 is used for detecting inlet water information of the gas water heater, the inlet water information comprises inlet water pressure, the water pump 12 is used for pressurizing inlet water flow of the gas water heater, and the controller 10 is used for executing the control method provided by any one of the above-mentioned embodiments, therefore, the gas water heater provided by the embodiment of the present application has the technical effects of the technical solutions in any one of the above-mentioned embodiments, and the same or corresponding structures and explanations of terms are not described herein again.

[0131] For example, as shown in Figure 4 The gas water heater comprises a heat exchanger 13, the heat exchanger 13 is connected with an inlet water pipe 14 and an outlet water pipe 15 respectively, and the heat exchanger 13 is also connected with a burner (not shown in the figure), the burner generates high-temperature flue gas by burning gas, and heat is transferred to cold water flowing through the heat exchanger, the cold water flowing through the heat exchanger is heated after absorbing heat, and becomes hot water flowing out of the gas water heater, so that the purpose of heating water is achieved.

[0132] The water pump 12 is arranged on the inlet water pipe 14 and is used for pressurizing the inlet water flow of the gas water heater. The controller 10 is connected with the water pump 12 to control the water pump 12 to start running at a target rotating speed.

[0133] The sensor assembly 11 comprises an inlet water pressure sensor 111 arranged on the inlet water pipe 14, the inlet water pressure sensor 111 is used for monitoring the inlet water pressure of the gas water heater in real time and sending the detected inlet water pressure to the controller 10.

[0134] The controller 10 is configured to acquire inlet water information of the gas water heater, the inlet water information comprising inlet water pressure; when the inlet water information meets a preset condition, determining a target rotating speed of the water pump according to the inlet water pressure, wherein when the inlet water pressure is less than or equal to a first preset threshold, the smaller the inlet water pressure is, the smaller the target rotating speed is; and controlling the water pump to run at the target rotating speed to pressurize the inlet water flow of the gas water heater.

[0135] In an embodiment, the controller 10 is specifically configured to set the target rotating speed of the water pump 12 as the maximum rotating speed of the water pump 12 when the water inlet pressure is greater than a first preset threshold.

[0136] With reference back to Figure 4 , the sensor assembly 11 further comprises a water inlet pressure sensor 112 arranged on the water inlet pipe 14, the water inlet pressure sensor 112 being configured to monitor the water inlet flow rate of the gas water heater in real time and send the detected water inlet flow rate to the controller 10.

[0137] In an embodiment, the controller 10 is specifically configured to determine the target rotating speed of the water pump 12 according to the water inlet pressure when the water inlet pressure is greater than or equal to the start pressure threshold, the water inlet flow rate is greater than the start flow rate threshold and lasts for a first preset time length.

[0138] In an embodiment, the controller 10 is specifically configured to determine the target rotating speed of the water pump 12 according to the water inlet pressure when the absolute value of the difference between the water inlet pressure and the historical water inlet pressure is greater than or equal to a second preset threshold, and / or, the absolute value of the difference between the water inlet flow rate and the historical water inlet flow rate is greater than or equal to a third preset threshold.

[0139] Optionally, the first preset threshold is P1, 0.28 MPa≤P1≤0.32 MPa.

[0140] In an embodiment, the controller 10 is further configured to control the water pump to operate at the set rotating speed of the water pump when the set rotating speed of the water pump set by the user is different from the target rotating speed after controlling the water pump to operate at the target rotating speed.

[0141] In an embodiment, the controller 10 is further configured to send a prompt information to adjust the set rotating speed when the water inlet flow rate is less than or equal to a fourth preset threshold and maintains for a second preset time length after controlling the water pump to operate at the set rotating speed.

[0142] In an embodiment, the controller 10 is further configured to determine the target fire power of the gas water heater according to the water inlet flow rate after obtaining the water inlet information of the gas water heater, wherein the greater the water inlet flow rate is, the greater the target fire power is, when the water inlet pressure is greater than or equal to the start pressure threshold, the water inlet flow rate is greater than the start flow rate threshold and lasts for a first preset time length, and control the gas water heater to heat at the target fire power.

[0143] The sensor assembly 11 further comprises a water outlet temperature sensor (not shown in the figure) arranged on the water outlet pipe 15, the water outlet temperature sensor being configured to monitor the water outlet temperature of the gas water heater in real time and send the detected water outlet temperature to the controller 10.

[0144] In an embodiment, the controller 10 is further configured to obtain the outlet water temperature of the gas water heater after controlling the gas water heater to heat at the target fire power; and decrease the target rotating speed of the water pump when the target fire power is the maximum fire power, the outlet water temperature is less than the set outlet water temperature and the condition lasts for a preset time length.

[0145] With reference back to Figure 4 , the sensor assembly 11 further comprises a water inlet temperature sensor 113 arranged on the water inlet pipe 14, the water inlet temperature sensor 113 is configured to monitor the water inlet temperature of the gas water heater in real time and send the detected water inlet temperature to the controller 10.

[0146] In an embodiment, the controller 10 is specifically configured to determine the target fire power of the gas water heater according to the water inlet flow and the water inlet temperature, control the gas water heater to heat at the target fire power, so as to stabilize the outlet water temperature of the gas water heater at the set outlet water temperature set by the user, and achieve the constant temperature effect.

[0147] With reference back to Figure 4 , the sensor assembly 11 further comprises a key panel 16, the key panel 16 is connected with the controller 10, and the user can input the set rotating speed of the water pump through the key panel 16, the key panel 16 sends the set rotating speed to the controller 10, and the controller 10 is configured to control the water pump to operate at the set rotating speed.

[0148] For example, as shown in Figure 4 , the key panel 16 is provided with five gear keys, each gear key corresponds to a different set rotating speed value of the water pump, and the user can set the corresponding set rotating speed by pressing different gear keys according to the user's own water use habit.

[0149] The gas water heater provided by the embodiment of the present application controls the target rotating speed of the water pump according to the water inlet pressure when the water inlet information meets the preset condition, controls the water pump to operate at the target rotating speed, and pressurizes the water flow of the gas water heater, wherein when the water inlet pressure is less than or equal to the first preset threshold value, the smaller the water inlet pressure is, the smaller the target rotating speed is, so that when the water inlet pressure is small, the rotating speed of the water pump decreases with the decrease of the water inlet pressure, avoiding the phenomenon that the water pump cannot suck water when the water inlet pressure is small, ensuring the stability of the water inlet flow, and further avoiding the problem that the outlet water temperature of the gas water heater changes suddenly with the sudden change of the water inlet flow, achieving the constant temperature effect of the outlet water, solving the problem that the user's bathroom demand cannot be met under a small water inlet flow, and improving the user's bathroom comfort.

[0150] It should be understood that the various forms of flow shown above can be used to reorder, add or delete steps. For example, the steps described in the present application can be executed in parallel, in sequence or in different orders, as long as the desired results of the technical solutions of the present application can be achieved, which are not limited herein.

[0151] The foregoing detailed description has set forth various embodiments of the devices and / or processes via the use of specific terminology. However, embodiments thereof can be practiced with the exact description not being presented in detail. The term "device" should be understood to encompass devices and / or processes. The embodiments are not limited to the specific devices, methods, or implementations described. The terminology used can include the use of common or specific terminology that is understood by those skilled in the art and / or as is used in the various patents and publications discussed below. Such terminology can be used in conjunction with the disclosure provided herein to aid in the description of the various devices and / or processes.

Claims

1. A control method for a gas water heater, characterized in that, include: Obtain the water inlet information of the gas water heater, including water inlet pressure, water inlet flow rate, and water inlet temperature; When the water inlet information meets the preset conditions, the target speed of the water pump is determined based on the water inlet pressure. Specifically, when the water inlet pressure is less than or equal to a first preset threshold, the lower the water inlet pressure, the lower the target speed, to ensure a stable water inlet flow rate. The water inlet pressure is divided into multiple water inlet pressure intervals, and each water inlet pressure interval corresponds to a target speed. When determining the target speed of the water pump based on the water inlet pressure, the corresponding target speed is determined based on the correspondence between the water inlet pressure interval and the target speed, according to the water inlet pressure interval in which the water inlet pressure is located. The water pump is controlled to start and run at the target speed to pressurize the inlet water flow of the gas water heater; The target heat output of the gas water heater is determined based on the pressurized inlet water flow rate and the set outlet water temperature. The greater the pressurized inlet water flow rate, the greater the target heat output, and the higher the set outlet water temperature, the greater the target heat output. Control the gas water heater to heat at the target heat output; Obtain the outlet water temperature of the gas water heater; When the target firepower is at maximum firepower, and the outlet water temperature is lower than the set outlet water temperature for a preset duration, the target rotation speed of the water pump is reduced.

2. The control method according to claim 1, characterized in that, Determining the target speed of the water pump based on the inlet water pressure includes: When the inlet water pressure is greater than the first preset threshold, the target rotation speed is the maximum rotation speed of the water pump.

3. The control method according to claim 1, characterized in that, When the water inlet information meets preset conditions, the target speed of the water pump is determined based on the water inlet pressure, including: When the inlet water pressure is greater than or equal to the start-up pressure threshold, and the inlet water flow rate is greater than the start-up flow rate threshold and continues for a first preset duration, the target speed of the water pump is determined based on the inlet water pressure.

4. The control method according to claim 1, characterized in that, When the water inlet information meets preset conditions, the target speed of the water pump is determined based on the water inlet pressure, including: When the absolute value of the difference between the inlet water pressure and the historical inlet water pressure is greater than or equal to a second preset threshold, and / or the absolute value of the difference between the inlet water flow rate and the historical inlet water flow rate is greater than or equal to a third preset threshold, the target speed of the water pump is determined based on the inlet water pressure.

5. The control method according to any one of claims 1-4, characterized in that, The first preset threshold is P1, where 0.28MPa≤P1≤0.32MPa.

6. The control method according to claim 1, characterized in that, After controlling the water pump to operate at the target speed, the method further includes: When the user-set speed of the water pump differs from the target speed, the water pump is controlled to operate at the set speed.

7. The control method according to claim 6, characterized in that, After controlling the water pump to operate at the set speed, the method further includes: When the inlet flow rate is less than or equal to the fourth preset threshold and remains at the second preset duration, a prompt message is issued to adjust the set rotation speed.

8. A gas water heater, characterized in that, Includes controllers, sensor components, and water pumps; The sensor assembly and the water pump are respectively connected to the controller; The sensor assembly is used to detect the water inlet information of the gas water heater, including water inlet pressure, water inlet flow rate, and water inlet temperature. The water pump is used to pressurize the inlet water flow of the gas water heater; The controller is used to execute the control method according to any one of claims 1-7.

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