Gas water heater bypass ratio adjusting method and gas water heater

Abstract

The invention relates to the technical field of hot water supply equipment, and discloses a gas water heater bypass ratio adjusting method and a gas water heater, and the gas water heater bypass ratio adjusting method comprises the steps that when the gas water heater is restarted under the preset condition, target power needed by current heating is determined according to the set temperature, and therefore the bypass ratio adjusting amplitude corresponding to the target power is determined; and adjusting the current bypass ratio by adopting the bypass ratio adjusting amplitude. And the bypass ratio adjusting amplitude corresponding to the power is adaptively adjusted according to the outlet water temperature of the water heater after bypass ratio adjustment, the bypass ratio adjusting amplitude is circularly adjusted, and therefore the final target bypass ratio is determined. According to the method, the bypass ratio adjusting amplitude is automatically adjusted, and then the bypass ratio can be adjusted according to the bypass ratio adjusting amplitude, so that the outlet water temperature is closer to the set temperature, and the outlet water temperature deviation caused by the error of the temperature sensor is avoided.

Description

Technical Field

[0001] The invention relates to the technical field of hot water supply equipment, and in particular to a bypass ratio adjustment method for a gas water heater and a gas water heater. Background Art

[0002] The outlet and inlet pipes of the heat exchanger of the gas water heater are connected with a bypass pipe, and a bypass valve is set on the bypass pipe to control the bypass flow. The gas water heater is equipped with a temperature probe to measure the inlet and outlet water temperatures. If the temperature probe is in a high temperature state for a long time and scale forms on the surface, causing the detected water temperature to deviate from the actual temperature, it will cause errors in the bypass ratio calculated based on the water temperature. The bypass ratio deviation causes the outlet water temperature to fluctuate during the second start-up. Summary of the invention

[0003] The technical problem solved by the present invention is to provide a method for adjusting the bypass ratio of a gas water heater and a gas water heater, which effectively solves the problem of outlet water temperature fluctuation caused by deviation of the bypass ratio.

[0004] The first technical problem mentioned above is solved by the following technical solution:

[0005] When the gas water heater is started again within a preset time or a preset temperature change range, a target power is determined according to the set temperature of the gas water heater, and a bypass ratio adjustment amplitude corresponding to the target power is determined;

[0006] adjusting the current bypass ratio based on the bypass ratio adjustment amplitude to obtain a first bypass ratio;

[0007] After adjusting the current bypass ratio, obtaining a first current water outlet temperature of the gas water heater, and comparing the first current water outlet temperature with a set temperature to obtain a comparison result;

[0008] A target bypass ratio adjustment range corresponding to the target power is determined based on the comparison result, and the first bypass ratio is adjusted to a target bypass ratio based on the target bypass ratio adjustment range.

[0009] Compared with the background technology, the control method of the gas water heater described in the present invention has the following beneficial effects: the bypass ratio adjustment method of the gas water heater provided in the embodiment of the present invention, when the gas water heater is restarted under preset conditions, determines the target power required for the current heating according to the set temperature, thereby determining the bypass ratio adjustment amplitude corresponding to the target power, and uses the bypass ratio adjustment amplitude to adjust the current bypass ratio. According to the outlet water temperature of the water heater after the bypass ratio adjustment, the bypass ratio adjustment amplitude corresponding to the power is adaptively adjusted, and the bypass ratio adjustment amplitude is cyclically adjusted to determine the final target bypass ratio. The method automatically adjusts the bypass ratio adjustment amplitude, and then can adjust the bypass ratio according to the bypass ratio adjustment amplitude, so that the outlet water temperature is closer to the set temperature, avoiding the outlet water temperature deviation caused by the bypass ratio error.

[0010] In one embodiment, determining the target power according to the set temperature of the gas water heater includes:

[0011] Obtaining the water flow rate and water inlet temperature of the gas water heater, and calculating the difference between the set temperature and the water inlet temperature;

[0012] The target power is determined based on a product of the difference and the water flow rate.

[0013] In one embodiment, determining the bypass ratio adjustment amplitude corresponding to the target power includes:

[0014] A pre-stored relationship table is queried based on the target power to obtain a bypass ratio adjustment range corresponding to the target power, wherein the pre-stored relationship table is used to characterize the corresponding relationship between power and bypass ratio adjustment range.

[0015] In one embodiment, the comparing the first current outlet water temperature with the set temperature to obtain a comparison result includes:

[0016] Calculating a first difference between the first current water outlet temperature and the set temperature;

[0017] The first difference is compared with a preset range to obtain the comparison result.

[0018] In one embodiment, determining the target bypass ratio adjustment amplitude corresponding to the target power based on the comparison result includes:

[0019] When the first difference is within the preset range, the bypass ratio adjustment range is maintained unchanged to obtain the target bypass ratio adjustment range.

[0020] In one embodiment, determining the target bypass ratio adjustment amplitude corresponding to the target power based on the comparison result includes:

[0021] When the first difference is not within the preset range, the bypass ratio adjustment amplitude corresponding to the target power is corrected based on the preset adjustment amplitude to obtain a corrected bypass ratio adjustment amplitude;

[0022] adjusting the first bypass ratio based on the corrected bypass ratio adjustment amplitude, and acquiring a second current water outlet temperature after adjusting the first bypass ratio;

[0023] Comparing the second current water outlet temperature with the set temperature to obtain a comparison result;

[0024] A target bypass ratio adjustment amplitude corresponding to the target power is determined based on the comparison result.

[0025] In one embodiment, when the first difference is not within the preset range, the bypass ratio adjustment amplitude corresponding to the target power is corrected based on a preset adjustment amplitude to obtain a corrected bypass ratio adjustment amplitude, including:

[0026] When the first difference is greater than the maximum value in the preset range, reducing the bypass ratio adjustment amplitude corresponding to the target power based on the preset adjustment amplitude to obtain a corrected bypass ratio adjustment amplitude;

[0027] When the first difference is smaller than the minimum value in the preset range, the bypass ratio adjustment amplitude corresponding to the target power is increased based on the preset adjustment amplitude to obtain a corrected bypass ratio adjustment amplitude.

[0028] In one embodiment, the method further comprises:

[0029] The bypass ratio adjustment range corresponding to the target power in the pre-stored relationship table is modified to the target bypass ratio adjustment range to update the pre-stored relationship table.

[0030] In one embodiment, before determining the target power according to the set temperature of the gas water heater, the method further includes:

[0031] When the gas water heater is started, the current water tank temperature and the current water outlet temperature are obtained;

[0032] Calculating a first temperature difference between the current water tank temperature and the first water tank temperature when the gas water heater was last shut off;

[0033] Calculating a second temperature difference between the current outlet water temperature and the first outlet water temperature when the gas water heater was last shut off;

[0034] When the first temperature difference is smaller than a first preset temperature difference and / or the first temperature difference is smaller than a second preset temperature difference, it is determined that the gas water heater is restarted within a preset temperature variation range.

[0035] The above second technical problem is solved by the following technical solution:

[0036] A gas water heater comprises a control device, wherein the control device is used to execute any one of the above-mentioned methods for adjusting the bypass ratio of the gas water heater.

[0037] Compared with the background technology, the control method of the gas water heater of the present invention has the following beneficial effects: according to the outlet water temperature of the water heater after the bypass ratio is adjusted, the bypass ratio adjustment amplitude corresponding to the power is adaptively adjusted, and the bypass ratio adjustment amplitude is cyclically adjusted to determine the final target bypass ratio. The method automatically adjusts the bypass ratio adjustment amplitude, and then the bypass ratio can be adjusted according to the bypass ratio adjustment amplitude, so that the outlet water temperature is closer to the set temperature, avoiding the outlet water temperature deviation caused by the temperature sensor error. BRIEF DESCRIPTION OF THE DRAWINGS

[0038] In order to more clearly illustrate the specific implementation methods of the present invention or the technical solutions in the prior art, the drawings required for use in the specific implementation methods or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are some implementation methods of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative work.

[0039] Figure 1 A schematic diagram of a gas water heater according to an embodiment of the present invention;

[0040] Figure 2 A schematic flow chart of a control method for a gas water heater according to an embodiment of the present invention;

[0041] Figure 3 Schematic diagram of a flow chart of a method for controlling a gas water heater according to an embodiment of the present invention. DETAILED DESCRIPTION

[0042] The following will be combined with the drawings in the embodiments of the present application to clearly and completely describe the technical solutions in the embodiments of the present application. Obviously, the described embodiments are only part of the embodiments of the present application, not all of the embodiments. Based on the embodiments in the present application, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of this application.

[0043] In the description of the present application, it should be understood that the terms "center", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside", etc., indicating orientations or positional relationships, are based on the orientations or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present application and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be understood as a limitation on the present application.

[0044] The terms "first" and "second" are used for descriptive purposes only and should not be understood as indicating or implying relative importance or implicitly indicating the number of the indicated technical features. Thus, a feature defined as "first" or "second" may explicitly or implicitly include one or more of the features. In the description of this application, unless otherwise specified, "plurality" means two or more.

[0045] In the description of this application, it should be noted that, unless otherwise clearly specified and limited, the terms "installed", "connected", and "connected" should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection, or it can be indirectly connected through an intermediate medium, or it can be the internal communication of two components. For ordinary technicians in this field, the specific meanings of the above terms in this application can be understood according to specific circumstances.

[0046] In a gas water heater, a bypass pipe is installed between the water outlet and the water inlet of the heat exchanger, and a bypass valve is arranged on the bypass pipe to adjust the water flow in the bypass pipe. In addition, the water heater is equipped with a temperature sensor, which measures the water temperature of the water flowing into the water inlet and the water temperature flowing out of the water outlet. If scale accumulates on the surface of this sensor due to long-term exposure to a high temperature environment, the water temperature value measured by it will no longer accurately reflect the actual temperature. The bypass ratio corresponding to each gear position of the bypass valve is calculated based on the inlet water temperature, the outlet water temperature and the water tank temperature. If there is a temperature detection value that deviates from the actual water temperature, it will cause the calculated bypass ratio to deviate, that is, the bypass ratio corresponding to the bypass valve gear position deviates from the actual value. Therefore, there is an error in the energy released when the water heater is started again, causing the final outlet water temperature to deviate from the set temperature.

[0047] According to an embodiment of the present invention, on the one hand, a gas water heater is provided, such as Figure 1As shown, the gas water heater includes a heat exchanger, a bypass valve, a water flow sensor, a water inlet temperature sensor, a water tank temperature sensor, a water outlet temperature sensor, and a water mixing tank is arranged at the intersection of the bypass pipe and the water outlet pipe. Among them, the water inlet end of the heat exchanger is provided with a water inlet pipe, the water outlet end of the heat exchanger is provided with a water outlet pipe, and the heat exchange pipe is arranged in the heat exchanger. The bypass valve is arranged on the bypass pipe, and the bypass pipe is connected with the water inlet pipe and the water outlet pipe respectively. The bypass valve can be provided with multiple gears for adjusting the bypass ratio, and each gear corresponds to a different bypass ratio. The water flow sensor is arranged at the water inlet end of the water inlet pipe, and is used to measure the water flow of the inlet water. The bypass valve can adopt a water proportional valve, and the bypass ratio can be adjusted as needed. The water inlet temperature sensor is arranged at the water inlet end of the water inlet pipe, and is used to measure the water inlet temperature of the water inlet. The water tank temperature sensor is arranged at the water outlet end of the heat exchanger, and is used to measure the water outlet temperature of the heat exchange pipe. The water outlet temperature sensor is arranged at the water outlet end of the water outlet pipe, and is used to measure the water outlet temperature. Mixing tanks are used for energy storage and water mixing.

[0048] According to an embodiment of the present invention, a control method for a gas water heater is provided, which can be used for the above-mentioned gas water heater. Figure 2 is a flow chart of a control method for a gas water heater according to an embodiment of the present invention. Figure 2 As shown, the process includes the following steps:

[0049] Step S101, when the gas water heater is restarted within a preset time or a preset temperature variation range, a target power is determined according to a set temperature of the gas water heater, and a bypass ratio adjustment amplitude corresponding to the target power is determined.

[0050] The embodiment of the present invention is applied to the scenario where the gas water heater is restarted within a short time or within a temperature variation range, specifically, the situation where the gas water heater is originally in a stable working state and is restarted within a preset time or within a preset temperature variation range after the water is turned off. The preset time is a time length that is preset according to actual needs and taking into account the parameters of the gas water heater itself. Specifically, if it is measured that the current start-up time of the gas water heater is within the preset time from the last shut-down time, it means that the current restart scenario applied by this embodiment is. In addition, it can also be judged whether it is restarted according to the temperature, and the temperature change can consider the change of the water tank temperature or / and the outlet water temperature. Exemplarily, taking the water tank temperature as an example of temperature change, the water tank temperature refers to the outlet water temperature of the heat exchanger, which can be measured by the water tank temperature sensor. After the gas water heater is turned off for the last time, the water tank temperature measured at that time will be recorded. After the gas water heater is turned on again, the current water tank temperature is measured by the water tank temperature sensor. If the temperature difference between the water tank temperature recorded when it is turned off and the current water tank temperature is within the preset temperature difference, it means that the gas water heater is restarted within the preset temperature variation range.

[0051] After judgment, if the gas water heater is started again within the preset time or within the preset temperature change range, the target power is calculated according to the set temperature of the gas water heater. The target power is the power required to heat the water in the heat exchanger to reach the set temperature. The set temperature can be set by the user and indicates the desired water outlet temperature. It can be set on the control panel of the gas water heater. When calculating the target power, it can also be combined with parameters such as the set temperature and the water inlet temperature.

[0052] The bypass ratio adjustment range refers to the size or degree of the bypass ratio adjustment. There is a corresponding relationship between the target power and the bypass ratio adjustment range, and the corresponding relationship between the target power and the bypass ratio adjustment range is pre-stored in the control device of the gas water heater. In this corresponding relationship, the target power and the bypass ratio adjustment range can be one-to-one corresponding, or the power range and the bypass ratio adjustment range can be corresponding. The specific setting can be based on actual needs and is not limited here.

[0053] Step S102: adjusting the current bypass ratio based on the bypass ratio adjustment amplitude to obtain a first bypass ratio.

[0054] After determining the bypass ratio adjustment range, the current bypass ratio is adjusted. Specifically, when adjusting the current bypass ratio, the bypass ratio adjustment range is used for adjustment, and the adjusted bypass ratio is the first bypass ratio. The adjustment process is specifically achieved by controlling the opening of the bypass valve. The larger the opening, the larger the bypass ratio, and the more water flows through the bypass pipe.

[0055] Step S103, after adjusting the current bypass ratio, obtaining the first current water outlet temperature of the gas water heater, and comparing the first current water outlet temperature with the set temperature to obtain a comparison result.

[0056] The first current outlet water temperature of the gas water heater refers to the outlet water temperature of the outlet pipe of the gas water heater after the bypass ratio is adjusted, which can be measured by setting at the outlet end of the outlet pipe.

[0057] The first current water outlet temperature is compared with the set temperature to obtain a comparison result, wherein the comparison result includes that the first current water outlet temperature is greater than the set temperature, the first current water outlet temperature is less than the set temperature, and the first current water outlet temperature is equal to the set temperature.

[0058] In an optional embodiment, the first current water outlet temperature can also be compared with a preset temperature range. The preset temperature range is a temperature interval, which can be centered on the set temperature, that is, the temperature range above and below the set temperature belongs to the preset temperature range.

[0059] The method of comparing the first current outlet water temperature with the set temperature is not specifically limited here.

[0060] Step S104: determining a target bypass ratio adjustment range corresponding to the target power based on the comparison result, and adjusting the first bypass ratio to the target bypass ratio based on the target bypass ratio adjustment range.

[0061] Based on the comparison result in step S103, the bypass ratio adjustment range is further adjusted to achieve the set temperature, thereby determining the target bypass ratio adjustment range corresponding to the target power. Afterwards, the first bypass ratio obtained previously can be adjusted again according to the target bypass ratio adjustment range to obtain the final target bypass ratio. This process may require multiple iterations until the outlet water temperature is close to the set temperature or reaches a preset error range.

[0062] Specifically, if the first current water outlet temperature deviates too greatly from the set temperature, for example, the difference exceeds the set temperature threshold, it can be considered that the target bypass ratio adjustment amplitude needs to be adjusted.

[0063] The control method of the gas water heater provided in the embodiment of the present invention, when the gas water heater is restarted under preset conditions, determines the target power required for the current heating according to the set temperature, thereby determining the bypass ratio adjustment amplitude corresponding to the target power, and uses the bypass ratio adjustment amplitude to adjust the current bypass ratio. According to the outlet water temperature of the water heater after the bypass ratio adjustment, the bypass ratio adjustment amplitude corresponding to the power is adaptively adjusted, and the bypass ratio adjustment amplitude is cyclically adjusted to determine the final target bypass ratio. The method automatically adjusts the bypass ratio adjustment amplitude, and then can adjust the bypass ratio according to the bypass ratio adjustment amplitude, so that the outlet water temperature is closer to the set temperature, avoiding the outlet water temperature deviation caused by the temperature sensor error.

[0064] According to an embodiment of the present invention, a control method for a gas water heater is provided, which can be used for the above-mentioned gas water heater, and the method comprises the following steps:

[0065] Step S201, when the gas water heater is restarted within a preset time or a preset temperature variation range, a target power is determined according to a set temperature of the gas water heater, and a bypass ratio adjustment amplitude corresponding to the target power is determined.

[0066] In some optional implementations, determining the target power according to the set temperature of the gas water heater in the above step S201 includes:

[0067] Step S2011, obtaining the water flow rate and water inlet temperature of the gas water heater, and calculating the difference between the set temperature and the water inlet temperature;

[0068] Step S2012, determining the target power based on the product of the difference and the water flow rate.

[0069] Assume the target power is W, and the target power is calculated according to the following formula:

[0070] W=(Tm -T j )×L

[0071] Where W represents the target power, T m Indicates the set temperature, T j represents the inlet water temperature, and L represents the water flow rate.

[0072] The set temperature can be set by the user, indicating the desired final water outlet temperature, the water inlet temperature can be measured by the water inlet temperature sensor, and the water flow rate can be measured by the water flow rate sensor.

[0073] In some optional implementations, determining the bypass ratio adjustment range corresponding to the target power in step S201 includes: querying a pre-stored relationship table based on the target power to obtain the bypass ratio adjustment range corresponding to the target power. The pre-stored relationship table is used to characterize the corresponding relationship between power and bypass ratio adjustment range.

[0074] The pre-stored relationship table is a pre-stored table or database, which stores the corresponding relationship between different power levels and the corresponding bypass ratio adjustment range. This corresponding relationship is based on experimental data and is summarized in the design stage of the gas water heater. By querying the pre-stored relationship table, the bypass ratio adjustment range corresponding to the target power can be found.

[0075] As an example, the pre-stored relationship table is as follows:

[0076]

[0077] In the pre-stored relationship table of this example, there is a corresponding relationship between the power range and the bypass ratio adjustment amplitude. Therefore, after determining the target power, the power range in which the target power is located is first queried, and then the bypass ratio adjustment amplitude corresponding to the power range is obtained.

[0078] Step S202: adjusting the current bypass ratio based on the bypass ratio adjustment amplitude to obtain a first bypass ratio.

[0079] For details, please see Figure 1 Step S102 of the illustrated embodiment will not be described in detail here.

[0080] Step S203, after adjusting the current bypass ratio, obtaining the first current water outlet temperature of the gas water heater, and comparing the first current water outlet temperature with the set temperature to obtain a comparison result.

[0081] For details, please see Figure 1 Step S103 of the illustrated embodiment will not be described in detail here.

[0082] Step S204: determining a target bypass ratio adjustment range corresponding to the target power based on the comparison result, and adjusting the first bypass ratio to the target bypass ratio based on the target bypass ratio adjustment range.

[0083] For details, please see Figure 1 Step S104 of the illustrated embodiment will not be described in detail here.

[0084] In some optional implementations, the control method of the gas water heater provided in the above embodiment further includes: modifying the bypass ratio adjustment range corresponding to the target power in the pre-stored relationship table to the target bypass ratio adjustment range to update the pre-stored relationship table.

[0085] The target bypass ratio adjustment range is determined through one or more iterations, and is intended to make the outlet water temperature of the gas water heater closer to the set temperature by adjusting the bypass ratio. Therefore, after determining the target bypass ratio adjustment range, the bypass ratio adjustment range corresponding to the target power in the pre-stored relationship table is modified to the target bypass ratio adjustment range.

[0086] In some optional implementations, the control method of the gas water heater provided in the above embodiment further includes:

[0087] Step S301, when the gas water heater is started, the current water tank temperature and the current water outlet temperature are obtained.

[0088] The current time refers to the time after the gas water heater is started. After the gas water heater is started, the current water tank temperature and the current outlet water temperature are obtained. The current water tank temperature can be measured by the water tank temperature sensor, and the current outlet water temperature can be measured by the outlet water temperature sensor.

[0089] Step S302, calculating a first temperature difference between the current water tank temperature and the first water tank temperature when the gas water heater was last turned off.

[0090] The control device of the gas water heater stores the first water tank temperature when the water was last turned off, calculates the temperature difference between the current water tank temperature and the first water tank temperature when the water was last turned off, and defines the temperature difference as the first temperature difference.

[0091] Step S303, calculating a second temperature difference between the current outlet water temperature and the first outlet water temperature when the gas water heater was last shut off.

[0092] The control device of the gas water heater also stores the first outlet water temperature when the water was last turned off, calculates the temperature difference between the current outlet water temperature and the first outlet water temperature when the water was last turned off, and defines the temperature difference as the second temperature difference.

[0093] Step S304: when the first temperature difference is less than the first preset temperature difference and / or the second temperature difference is less than the second preset temperature difference, it is determined that the gas water heater is restarted within the preset temperature variation range.

[0094] The first preset temperature difference and the second preset temperature difference are temperature difference thresholds set according to demand. If the first temperature difference is less than the first preset temperature difference, it can be considered that the current scene is that the gas water heater is restarted within the preset temperature range; if the second temperature difference is less than the second preset temperature difference, it can also be considered that the current scene is that the gas water heater is restarted within the preset temperature range; in addition, if the first temperature difference is less than the first preset temperature difference and the second temperature difference is less than the second preset temperature difference, it can also be considered that the current scene is that the gas water heater is restarted within the preset temperature range. Therefore, the specific temperature conditions that need to be met to restart within the preset temperature range may include multiple.

[0095] According to an embodiment of the present invention, a control method for a gas water heater is provided, which can be used for the above-mentioned gas water heater, and the method comprises the following steps:

[0096] Step S401, when the gas water heater is restarted within a preset time or a preset temperature variation range, a target power is determined according to a set temperature of the gas water heater, and a bypass ratio adjustment amplitude corresponding to the target power is determined.

[0097] For details, please see Figure 1 Step S104 of the illustrated embodiment will not be described in detail here.

[0098] Step S402: adjusting the current bypass ratio based on the bypass ratio adjustment amplitude to obtain a first bypass ratio.

[0099] For details, please see Figure 1 Step S102 of the illustrated embodiment will not be described in detail here.

[0100] Step S403, after adjusting the current bypass ratio, obtaining the first current water outlet temperature of the gas water heater, and comparing the first current water outlet temperature with the set temperature to obtain a comparison result.

[0101] In some optional implementations, in the above step S403, the first current water outlet temperature is compared with the set temperature to obtain a comparison result, including:

[0102] Step S4031, calculating a first difference between a first current water outlet temperature and a set temperature;

[0103] Step S4032: compare the first difference with a preset range to obtain a comparison result.

[0104] By calculating a first difference between the first current water outlet temperature and the set temperature, the difference between the water outlet temperature of the water heater and the set temperature is quantified. The preset range is used to define the allowable degree of deviation between the first current water outlet temperature and the set temperature. After calculating the first difference, the first difference is compared with the preset range. The comparison process may involve multiple aspects, including determining whether the first difference is positive or negative, determining whether the absolute value of the first difference is less than or equal to the upper limit and the lower limit of the preset range, etc.

[0105] Step S404: determining a target bypass ratio adjustment range corresponding to the target power based on the comparison result, and adjusting the first bypass ratio to the target bypass ratio based on the target bypass ratio adjustment range.

[0106] In some optional implementations, determining the target bypass ratio adjustment range corresponding to the target power based on the comparison result in the above step S404 includes:

[0107] Step S4041: when the first difference is within a preset range, the bypass ratio adjustment range is maintained unchanged to obtain a target bypass ratio adjustment range.

[0108] If the first difference is within the preset range, it means that the first current water outlet temperature is close to the set temperature. In this case, there is no need to adjust the bypass ratio adjustment range, and the bypass ratio adjustment range currently corresponding to the target power can be used as the target bypass ratio adjustment range.

[0109] Step S4042: When the first difference is not within the preset range, the bypass ratio adjustment range corresponding to the target power is corrected based on the preset adjustment range to obtain a corrected bypass ratio adjustment range.

[0110] If the first difference is not within the preset range, that is, the outlet water temperature of the water heater differs greatly from the set temperature, the bypass ratio adjustment range needs to be adjusted. The preset adjustment range can be a fixed value or a value dynamically calculated according to the specific situation. The bypass ratio adjustment range corresponding to the target power is corrected according to the preset adjustment range, so as to obtain a more appropriate bypass ratio adjustment range, that is, the corrected bypass ratio adjustment range.

[0111] Step S4043, adjusting the first bypass ratio based on the corrected bypass ratio adjustment amplitude, and obtaining the second current outlet water temperature after adjusting the first bypass ratio.

[0112] After obtaining the corrected bypass ratio adjustment range, the new adjustment range will be immediately applied to adjust the bypass ratio of the water heater (i.e., the first bypass ratio) to change the outlet water temperature. After the adjustment is completed, the outlet water temperature of the water heater will be measured again, i.e., the second current outlet water temperature. The purpose of this step is to verify whether the corrected bypass ratio adjustment range is effective, that is, whether it can make the outlet water temperature of the water heater closer to the temperature set by the user.

[0113] Step S4044, comparing the second current water outlet temperature with the set temperature to obtain a comparison result.

[0114] The second current water outlet temperature is compared with the temperature set by the user to obtain a new comparison result. This comparison result can be used to evaluate whether the corrected bypass ratio adjustment range is accurate enough and whether further adjustment is required.

[0115] Step S4045: determining a target bypass ratio adjustment range corresponding to the target power based on the comparison result.

[0116] The target bypass ratio adjustment range corresponding to the target power is determined again based on the comparison result. If the second current water outlet temperature still deviates greatly from the set temperature, the bypass ratio adjustment range may be corrected again, and the process of steps S4042 to S4045 is repeated until the water outlet temperature of the water heater meets the set temperature. If the second current water outlet temperature is close enough to the set temperature, the current bypass ratio adjustment range can be regarded as the target bypass ratio adjustment range, and the adjustment process can be ended.

[0117] Furthermore, the above-mentioned step S4042 includes: when the first difference is greater than the maximum value in the preset range, reducing the bypass ratio adjustment amplitude corresponding to the target power based on the preset adjustment amplitude to obtain a corrected bypass ratio adjustment amplitude; when the first difference is less than the minimum value in the preset range, increasing the bypass ratio adjustment amplitude corresponding to the target power based on the preset adjustment amplitude to obtain a corrected bypass ratio adjustment amplitude.

[0118] The first difference is the difference between the first current water outlet temperature and the set temperature. If the first difference is greater than the maximum value in the preset range, the bypass ratio adjustment amplitude is reduced based on the preset adjustment amplitude.

[0119] If the first difference is smaller than the minimum value in the preset range, the bypass ratio adjustment amplitude is increased based on the preset adjustment amplitude.

[0120] As an example, Figure 3 As shown, assuming that the preset range is -4°C to 4°C, if the first difference between the outlet water temperature and the set temperature is within ±4°C (i.e., -4°C ≤ first difference ≤ +4°C), the bypass ratio adjustment range is maintained. If the first difference is greater than +4°C, the bypass ratio adjustment range is adjusted downward; if the first difference exceeds -4°C (which can be understood as the first difference is less than -4°C), the bypass ratio adjustment range is adjusted upward.

[0121] According to an embodiment of the present invention, a gas water heater is provided. The gas water heater includes a control device for executing the gas water heater bypass ratio adjustment method provided in the above embodiment.

[0122] The further functional description of each of the above modules is the same as that of the above corresponding embodiments and will not be repeated here.

[0123] The control device in this embodiment is presented in the form of a functional unit, where the unit refers to an ASIC (Application Specific Integrated Circuit) circuit, a processor and memory that executes one or more software or fixed programs, and / or other devices that can provide the above functions.

[0124] In the specific contents of the above-mentioned specific implementation methods, the various technical features can be combined in any non-contradictory manner. In order to make the description concise, not all possible combinations of the above-mentioned technical features are described. However, as long as there is no contradiction in the combination of these technical features, they should be considered to be within the scope of this specification.

[0125] The specific contents of the above specific embodiments only express several embodiments of the present invention, and the description is relatively specific and detailed, but it cannot be understood as limiting the scope of the patent of the present invention. It should be pointed out that for ordinary technicians in this field, several modifications and improvements can be made without departing from the concept of the present invention, which all belong to the protection scope of the present invention. Therefore, the protection scope of the patent of the present invention shall be based on the attached claims.

Claims

1. A method for adjusting the bypass ratio of a gas water heater, characterized in that: The method comprises: When the gas water heater is started again within a preset time or a preset temperature range, a target power is determined according to the set temperature of the gas water heater, and a bypass ratio adjustment amplitude corresponding to the target power is determined; adjusting the current bypass ratio based on the bypass ratio adjustment amplitude to obtain a first bypass ratio; After adjusting the current bypass ratio, obtaining a first current water outlet temperature of the gas water heater, and comparing the first current water outlet temperature with a set temperature to obtain a comparison result; A target bypass ratio adjustment range corresponding to the target power is determined based on the comparison result, and the first bypass ratio is adjusted to a target bypass ratio based on the target bypass ratio adjustment range.

2. The method according to claim 1, characterized in that The step of determining the target power according to the set temperature of the gas water heater comprises: Obtaining the water flow rate and water inlet temperature of the gas water heater, and calculating the difference between the set temperature and the water inlet temperature; The target power is determined based on a product of the difference and the water flow rate.

3. The method according to claim 1, characterized in that The determining of the bypass ratio adjustment amplitude corresponding to the target power includes: A pre-stored relationship table is queried based on the target power to obtain a bypass ratio adjustment range corresponding to the target power, wherein the pre-stored relationship table is used to characterize the corresponding relationship between power and bypass ratio adjustment range.

4. The method according to claim 1, characterized in that The comparing the first current water outlet temperature with the set temperature to obtain a comparison result includes: Calculating a first difference between the first current water outlet temperature and the set temperature; The first difference is compared with a preset range to obtain the comparison result.

5. The method according to claim 4, characterized in that The determining the target bypass ratio adjustment amplitude corresponding to the target power based on the comparison result includes: When the first difference is within the preset range, the bypass ratio adjustment range is maintained unchanged to obtain the target bypass ratio adjustment range.

6. The method according to claim 4, characterized in that The determining the target bypass ratio adjustment amplitude corresponding to the target power based on the comparison result includes: When the first difference is not within the preset range, the bypass ratio adjustment amplitude corresponding to the target power is corrected based on the preset adjustment amplitude to obtain a corrected bypass ratio adjustment amplitude; adjusting the first bypass ratio based on the corrected bypass ratio adjustment amplitude, and acquiring a second current water outlet temperature after adjusting the first bypass ratio; Comparing the second current water outlet temperature with the set temperature to obtain a comparison result; A target bypass ratio adjustment amplitude corresponding to the target power is determined based on the comparison result.

7. The method according to claim 6, characterized in that When the first difference is not within the preset range, the bypass ratio adjustment amplitude corresponding to the target power is corrected based on the preset adjustment amplitude to obtain the corrected bypass ratio adjustment amplitude, including: When the first difference is greater than the maximum value in the preset range, reducing the bypass ratio adjustment amplitude corresponding to the target power based on the preset adjustment amplitude to obtain a corrected bypass ratio adjustment amplitude; When the first difference is smaller than the minimum value in the preset range, the bypass ratio adjustment amplitude corresponding to the target power is increased based on the preset adjustment amplitude to obtain a corrected bypass ratio adjustment amplitude.

8. The method according to claim 3, characterized in that The method further comprises: The bypass ratio adjustment range corresponding to the target power in the pre-stored relationship table is modified to the target bypass ratio adjustment range to update the pre-stored relationship table.

9. The method according to claim 8, characterized in that Before determining the target power according to the set temperature of the gas water heater, the method further includes: When the gas water heater is started, the current water tank temperature and the current water outlet temperature are obtained; Calculating a first temperature difference between the current water tank temperature and the first water tank temperature when the gas water heater was last shut off; Calculating a second temperature difference between the current outlet water temperature and the first outlet water temperature when the gas water heater was last shut off; When the first temperature difference is smaller than a first preset temperature difference and / or the second temperature difference is smaller than a second preset temperature difference, it is determined that the gas water heater is restarted within a preset temperature variation range.

10. A gas water heater, characterized in that: The gas water heater comprises a control device, and the control device is used to execute the gas water heater bypass ratio adjustment method described in any one of claims 1 to 9.

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