Gas water heater and control method thereof

Abstract

The embodiment of the invention provides a gas water heater and a control method thereof. The gas water heater comprises a water supply pipeline; the combustor is used for heating the water supply pipeline; the fuel gas pipeline is used for conveying fuel gas to the combustor, and a fuel gas proportional valve and the combustor are sequentially connected in series on the fuel gas pipeline in the gas flow direction; the controller is used for responding to operation of a user, controlling the booster pump to pressurize water flow in the water supply pipeline at a first lift and controlling the gas proportional valve to work under a first working condition, so that the water outlet flow of the gas water heater exceeds the rated flow and the water outlet temperature reaches the expected temperature, the booster pump is used for being connected with the water supply pipeline, and the booster pump is used for being connected with the water supply pipeline; the first lift is larger than the rated lift of the booster pump, and when the gas proportional valve works under the first working condition, the thermal load of the gas water heater is larger than the rated thermal load. According to the gas water heater, constant-temperature water flow supply of super-lift water flow is achieved.

Description

Technical Field

[0001] The present application relates to the field of electrical appliance technology, and in particular, to a gas water heater and a control method for the gas water heater. Background Art

[0002] With the improvement of living standards, gas water heaters have entered thousands of households. Gas water heaters can use the heat generated by gas combustion to instantly heat the water in the water supply pipeline, thereby meeting the user's bathing needs.

[0003] The gas water heater includes a water supply pipeline, a gas pipeline and a burner. The gas pipeline is connected to the burner and is used to deliver gas to the burner. A gas proportional valve may be provided on the gas pipeline to adjust the air flow in the gas pipeline. The water in the water supply pipeline is heated by the combustion of gas in the burner.

[0004] Although the existing gas water heaters can guarantee the basic needs of users for normal water flow, they are difficult to meet the users' needs for multiple points and large amounts of hot water, and cannot bring users the comfortable effect and experience of large-volume hot water waterfall showers. Summary of the invention

[0005] In order to at least partially solve the problems existing in the prior art, according to one aspect of the present application, a gas water heater is provided, comprising: a water supply pipeline; a burner for heating the water supply pipeline; a gas pipeline for conveying gas to the burner, a gas proportional valve and a burner being connected in series in sequence along the gas flow direction on the gas pipeline; and a controller, for: in response to user operation, controlling the booster pump to pressurize the water flow in the water supply pipeline with a first head, controlling the gas proportional valve to operate under a first working condition, so that the water outlet flow of the gas water heater exceeds the rated flow and the water outlet temperature reaches a desired temperature, wherein the booster pump is used to connect the water supply pipeline, the first head is greater than the rated head of the booster pump, and when the gas proportional valve operates under the first working condition, the heat load of the gas water heater is greater than the rated heat load.

[0006] In the above technical solution, the booster pump of the gas water heater pressurizes the water flow in the water supply pipeline with a first head exceeding its rated head, and controls the gas proportional valve to make the gas water heater work beyond the rated heat load. In this way, the heating power of the burner is ensured to match the corresponding water flow, and the constant temperature water flow supply of the super-head water flow is realized. This provides users with a large flow constant temperature hot water experience and meets the special needs of users.

[0007] Exemplarily, the gas water heater also includes a fan for blowing air into the burner; the controller is also used to determine a first speed of the fan and control the fan to operate at the first speed according to a first operating condition of the gas proportional valve, wherein the more gas passes through the gas proportional valve per unit time under the first operating condition, the greater the first speed.

[0008] In the above technical solution, the controller controls the fan to run at a corresponding speed according to the working condition of the gas proportional valve, thereby effectively reducing carbon monoxide emissions and increasing the effective thermal power of the gas water heater.

[0009] Exemplarily, the gas water heater also includes a flow sensor for detecting the flow rate of water in the water supply pipe; the controller controls the booster pump to pressurize the water in the water supply pipe with a first head, including performing the following operations: determining whether the flow rate of the water flow is in a first interval, wherein the lower limit value of the first interval is greater than 0 liters / minute and the upper limit value is less than or equal to the rated flow rate; when the flow rate of the water flow is in the first interval, controlling the booster pump to start and pressurize the water in the water supply pipe with the first head.

[0010] In the above technical solution, a flow sensor is used to detect the flow rate of water in the water supply pipeline in real time. Only when the flow rate of water is in a specific range, the booster pump is controlled to start and operate at a condition exceeding the rated head. This solution avoids the waste of resources by starting the booster pump when the water flow in the water supply pipeline is stagnant; and at the same time, it avoids the situation where the booster pump continues to increase the pressure when the flow rate of water in the water supply pipeline is already very large, so that the gas water heater cannot match the corresponding heat load, resulting in the user being unable to use hot water at the desired temperature.

[0011] Exemplarily, the controller is also used to control the booster pump to stop boosting when the water flow rate meets preset conditions.

[0012] In the above technical solution, the booster pump is controlled to stop boosting according to the flow rate of water in the water supply pipeline, thereby realizing accurate automatic control of the booster pump in the gas water heater and reducing manual operations of the user.

[0013] Exemplarily, the controller controls the boost pump to stop boosting when the water flow rate meets the preset conditions, including executing a first operation, wherein the first operation includes: determining whether the water flow rate is greater than or equal to the preset flow rate; when the water flow rate is greater than or equal to the preset flow rate, controlling the boost pump to stop boosting.

[0014] In the above technical solution, the booster pump is controlled to stop boosting based on whether the flow rate of the water flow is greater than or equal to the preset flow rate, thereby avoiding unnecessary work of the booster pump, saving resources and extending the service life of the booster pump.

[0015] Exemplarily, the controller controls the booster pump to stop boosting when the flow rate of the water flow meets the preset condition, including performing a second operation. The second operation includes: storing the flow rate of the water flow at a first preset frequency; calculating the flow difference between the currently stored flow rate and the flow rate stored at the previous moment; determining whether the flow difference is greater than a flow threshold; and when the flow difference is greater than the flow threshold, controlling the booster pump to stop boosting.

[0016] In the above technical solution, the user stops taking water based on the instantaneous change of the water flow, and then controls the booster pump to stop boosting. Therefore, the booster pump stops boosting in a timely and accurate manner when the user stops taking water, effectively saving resources.

[0017] Exemplarily, the water supply pipeline includes a first interface and a second interface, and the first interface and the second interface are used to connect to the two ends of the external pipeline of the gas water heater. The gas water heater also includes a first temperature sensor, and the first temperature sensor is used to detect the water flow temperature of the water inlet of the water supply pipeline. The controller is also used to: time the boosting time of the booster pump; when the counted time is the first time, store the water flow temperature of the water inlet; calculate the first temperature difference between the current water flow temperature of the water inlet and the stored water flow temperature of the water inlet; determine whether the first temperature difference is greater than or equal to the first temperature threshold; when the first temperature difference is greater than or equal to the first temperature threshold, control the booster pump to stop boosting.

[0018] In the above technical solution, the booster pump is controlled to stop boosting according to the change of the water inlet temperature after the booster pump is started. Therefore, the user's operation of stopping water extraction is accurately judged, and the booster pump is accurately and automatically controlled to stop boosting after the user stops extracting water, reducing the user's manual operation.

[0019] Exemplarily, the controller is also used to: calculate a second temperature difference between the expected temperature and the current water flow temperature at the water inlet; determine whether the second temperature difference is less than or equal to a second temperature threshold; and control the boost pump to stop boosting when the second temperature difference is less than or equal to the second temperature threshold.

[0020] The above technical solution is an effective supplement to the technical solution of controlling the booster pump to stop boosting according to the change of the inlet water temperature after the booster pump is started, and uses the difference between the expected temperature and the inlet water temperature to judge the user's operation of stopping water collection. This ensures that the booster pump can be controlled to stop boosting without error after the user stops taking water in any temperature environment.

[0021] Exemplarily, the controller controls the gas proportional valve to operate under the first working condition, including performing the following operations: controlling the gas proportional valve to operate under a first power supply current, wherein the first power supply current is greater than a rated power supply current of the gas proportional valve.

[0022] In the above technical solution, the controller adjusts the real-time thermal power of the burner by adjusting the power supply current of the gas proportional valve, thereby increasing the thermal load of the gas water heater. This not only provides users with a good experience of ensuring constant temperature hot water output of the gas water heater when taking hot water at a large flow rate, but is also easy to implement.

[0023] Exemplarily, the controller controls the gas proportioning valve to operate under the first working condition, including performing the following operations: controlling a pressure boosting device to increase the pressure of the gas passing through the gas proportioning valve, wherein the pressure boosting device is disposed in the gas proportioning valve.

[0024] In the above technical solution, the controller adjusts the real-time thermal power of the burner and increases the thermal load of the gas water heater by starting the booster device in the valve body of the gas proportional valve. This not only provides users with a good experience of constant temperature hot water output by the gas water heater when taking hot water at a large flow rate, but also has simple control logic.

[0025] Exemplarily, the gas water heater also includes a second temperature sensor, which is used to detect the water flow temperature of the water outlet of the water supply pipeline. The controller controls the gas proportional valve to operate under the first working condition, including performing the following operations: based on the expected temperature and the water flow temperature of the water outlet, the first power supply current of the gas proportional valve or the power of the boosting device is controlled by proportional integral differential (PID) so that the water outlet flow of the gas water heater exceeds the rated power and the water outlet temperature reaches the expected temperature.

[0026] In the above technical solution, the controller performs PID control on the gas proportional valve, thereby ensuring that the outlet water temperature of the gas water heater is always stable at the desired temperature set by the user, significantly improving the user experience.

[0027] According to another aspect of the present invention, a control method for a gas water heater is also provided, the gas water heater comprising: a water supply pipeline, a burner for heating the water supply pipeline, a gas pipeline for conveying gas to the burner, a gas proportional valve and a burner being connected in series in sequence along the air flow direction on the gas pipeline; the control method comprising: in response to a user's operation, controlling a booster pump to pressurize a water flow in the water supply pipeline with a first head, wherein the booster pump is used to connect the water supply pipeline, and the first head is greater than a rated head of the booster pump; controlling the gas proportional valve to operate under a first operating condition, so that a water outlet flow rate of the gas water heater exceeds a rated flow rate and a water outlet temperature reaches a desired temperature, wherein when the gas proportional valve operates under the first operating condition, a heat load of the gas water heater is greater than the rated heat load.

[0028] A series of simplified concepts are introduced in the application content, which will be further described in detail in the detailed implementation section. The application content section does not mean to attempt to define the key features and essential technical features of the technical solution claimed for protection, nor does it mean to attempt to determine the scope of protection of the technical solution claimed for protection.

[0029] The advantages and features of the present application are described in detail below in conjunction with the accompanying drawings. BRIEF DESCRIPTION OF THE DRAWINGS

[0030] The following drawings of the present application are hereby used as part of the present application for understanding the present application. The drawings show the implementation methods of the present application and their descriptions, and are used to explain the principles of the present application. In the drawings,

[0031] Figure 1 A schematic diagram of a gas water heater according to an embodiment of the present application is shown;

[0032] Figure 2 A schematic flow chart of a method for controlling a gas water heater according to an embodiment of the present application is shown;

[0033] Figure 3 A schematic flow chart of a method for controlling a gas water heater according to another embodiment of the present application is shown.

[0034] The above drawings include the following reference numerals:

[0035] 110. Water supply pipeline; 111. Booster pump; 112. First interface; 113. Second interface; 114. Flow sensor; 115. First temperature sensor; 116. Second temperature sensor; 120. Gas pipeline; 121. Gas proportional valve; 122. Burner; 130. Controller; 140. Fan. DETAILED DESCRIPTION

[0036] In the following description, a large amount of details are provided so that the present application can be thoroughly understood. However, it will be appreciated by those skilled in the art that the following description is merely illustrative of the preferred embodiments of the present application. In addition, in order to avoid confusion with the present application, some technical features well known in the art are not described in detail.

[0037] As mentioned above, although existing gas water heaters may be equipped with booster pumps. However, the booster pump is limited by its head, and generally loses the boosting effect when the water flow rate reaches about 9.5 liters / minute (L / min). In addition, in existing gas water heaters, the gas proportional valve often has some current input margin outside the nominal load, that is, the thermal load potential has not been fully released. This kind of idle performance is mostly due to material versatility considerations, but the cost investment brought by the idle performance needs to be paid by the user. In existing gas water heaters, the booster pump is only used to increase the water flow in the water supply pipeline, and does not consider the organic combination of water flow and thermal load to provide a comfortable effect and experience of a large amount of water waterfall.

[0038] In order to at least partially solve the above problems, according to one aspect of an embodiment of the present application, a gas water heater is provided. Figure 1 FIG. 1 shows a structural diagram of a gas water heater 100 according to an embodiment of the present application. Figure 1As shown, the gas water heater 100 includes a water supply pipeline 110 , a gas pipeline 120 , a burner 122 and a controller 130 .

[0039] The water supply pipeline 110 is arranged inside the shell of the water heater. The water supply pipeline 110 may include a first interface 112 and a second interface 113. The first interface 112 can be used to connect to a municipal pipeline. The second interface 113 can be used to connect to an external pipeline in the user's home, such as a water pipeline. When the user turns on the water end, such as a faucet, the gas water heater 100 starts. At this time, the cold water in the municipal pipeline flows through the water supply pipeline 110 of the gas water heater 100, and is heated in the process, and then flows to the user's water end for the user to take.

[0040] The gas pipeline 120 is connected to the burner 122 and is used to transport gas to the burner 122. The burner 122 is used to heat the water supply pipeline 110. The gas proportional valve 121 and the burner 122 are sequentially connected in series on the gas pipeline 120 along the air flow direction. In other words, according to the air flow direction, the gas proportional valve 121 is arranged upstream of the burner 122. The gas reaches the burner 122 through the gas proportional valve 121 in the gas pipeline 120. By controlling the gas proportional valve 121, for example, the opening of the gas proportional valve 121, the flow rate of the gas in the gas pipeline 120 can be controlled. The mixture of gas and air passing through the gas proportional valve 121 is ignited at the mouth of the burner 122 to form a stable flame combustion. The high-temperature airflow generated by the combustion of the gas can heat the cold water flowing through the water supply pipeline 110, thereby generating hot water.

[0041] The controller 130 can connect the booster pump 111 and the gas proportional valve 121 through a circuit to control the working states of the two. The controller 130 is used to control the booster pump 111 to pressurize the water flow in the water supply pipeline 110 with a first head in response to the user's operation, and control the gas proportional valve 121 to work under the first working condition, so that the water flow rate of the gas water heater 100 exceeds the rated flow rate and the water outlet temperature reaches the desired temperature. The booster pump 111 is used to connect the water supply pipeline 110. The first head is greater than the rated head of the booster pump 111. It can be understood that for any booster pump, it has a rated head. The rated head of the booster pump is the maximum head under normal operating conditions. When the gas proportional valve 121 works under the first working condition, the heat load of the gas water heater 100 is greater than the rated heat load.

[0042] The controller 130 may be implemented using various chips, such as a field programmable gate array (FPGA), a microprocessor (MPU), a programmable logic controller (PLC), a microprocessor unit (MCU), and the like.

[0043] The controller 130 may be connected to a booster pump 111. The booster pump 111 is used to connect to the water supply pipeline 110 and to boost the water flow in the water supply pipeline 110. Thus, the water flow rate per unit time of the water supply pipeline 110 can be increased. Figure 2 As shown, the booster pump 111 can be a part of the gas water heater 100 and arranged in the housing of the gas water heater 100. The booster pump can also be arranged on an external pipeline of the gas water heater 100. It can be understood that the booster pump is connected to the water supply pipeline 110 and can boost the water flow in the water supply pipeline 110. The booster pump 111 can be various booster water pumps currently available or developed in the future, such as a single-pipe booster pump, a DC booster pump, or a self-priming whole-house booster pump.

[0044] Exemplarily, the controller 130 can also be connected to an input device (not shown) of the gas water heater 100. The user can operate the gas water heater 100 through the input device. Specifically, for example, the gas water heater 100 can be provided with at least two working modes: normal and waterfall. When the gas water heater 100 works in normal mode, its heat load is less than or equal to the rated heat load. When the gas water heater 100 works in waterfall mode, its heat load is greater than the rated heat load, and it can quickly provide a large amount of hot water for the user to use. When, for example, the user needs to use hot water at multiple points at the same time or a large amount of hot water at a single point, the user can select the waterfall mode. When the gas water heater 100 starts the waterfall mode, the controller 130 can control the booster pump 111 to pressurize the water flow in the water supply pipeline 110 with a first head greater than its rated head in response to the user's operation of selecting the waterfall mode. For example, the controller 130 can provide the booster pump 111 with an input current exceeding its rated current to control the output power of the booster pump 111, thereby controlling the booster pump 111 to pressurize the water flow in the water supply pipeline 110 with a first head. In one example, the rated flow rate of the gas water heater 100 is 12L / min, and in its waterfall mode, under the action of the booster pump 111 working with the first head, its water flow rate can reach 16L / min. It can be understood that as the water flow rate of the gas water heater 100 increases, in order to make the water reach the desired temperature, the heat load of the gas water heater 100 also increases accordingly. The desired temperature can be a temperature pre-set by the user using an input device, such as 60 degrees. In order to increase the heat load of the gas water heater 100, the controller 130 can also control the gas proportional valve 121 to work under the first working condition. For example, the controller 130 can provide the gas proportional valve 121 with an input current exceeding its rated current to increase the opening of the gas proportional valve 121. This increases the gas flow in the gas pipeline and the thermal power of the burner 122 of the gas water heater 100. In other words, the controller 130 can break through the original upper limit of the current of the gas proportional valve 121, so that it can work under a condition greater than the rated current, so that more gas can be supplied to the burner 122 per unit time. In this way, the thermal load of the gas water heater 100 can be greater than its rated thermal load.

[0045] In the above technical solution, the booster pump 111 of the gas water heater 100 pressurizes the water flow in the water supply pipeline 110 with a first head exceeding its rated head, and controls the gas proportional valve 121 to make the gas water heater 100 work beyond the rated heat load. In this way, it is ensured that the heating power of the burner 122 matches the corresponding water flow, and the constant temperature water flow supply of the super-head water flow is realized. This provides users with a large flow constant temperature hot water usage experience and meets the special needs of users.

[0046] Exemplarily, the gas water heater 100 may also include a flow limiting device, which may be arranged on the water supply pipeline 110. The flow limiting device may be a manual water regulating valve or an automatic pressure stabilizing water regulating device. The automatic pressure stabilizing water regulating device may be mechanical or electronic. The flow limiting device is used to control the flow rate of the water flow in the water supply pipeline 110 within a specific range to ensure that when the inlet water temperature is as low as the third temperature, for example, when the inlet water temperature in winter is as low as below 8°C, the maximum water flow rate can also be achieved. The hot water output with a high temperature rise can then be output, thereby ensuring the user's water demand. In the gas water heater 100, the flow limiting flow of the flow limiting device is the flow rate of the water flow in the water supply pipeline 110 when the booster pump 111 works at the first head. Therefore, if the user, for example, wants to bathe with a large amount of water or use water at multiple points, the water volume of the gas water heater 100 can still be achieved even under the limitation of the flow limiting device. The flow limiting device ensures that the gas water heater 100 can meet the user's needs for showering, and even when the ambient temperature is very low, it also ensures that the user can take hot water at the desired temperature.

[0047] Exemplarily, the gas water heater 100 may further include a flow sensor 114. The flow sensor 114 is used to detect the flow rate of water in the water supply pipeline 110. It is understood that the flow sensor 114 may be disposed on the water supply pipeline 110, such as at the water inlet of the water supply pipeline 110, to detect the flow rate of water in the water supply pipeline 110 in real time. In most cases, the flow rate detected by the flow sensor 114 is also the flow rate of water taken by the user.

[0048] The controller 130 controls the booster pump 111 to pressurize the water flow in the water supply pipeline 110 with the first head, including the following operations: first, determine whether the flow rate of the water flow detected by the flow sensor 114 is in the first interval. Then, when the flow rate of the water flow is in the first interval, control the booster pump 111 to start and pressurize the water flow in the water supply pipeline 110 with the first head. In a specific example, the first interval can be the flow rate of the water flow in the water supply pipeline 110 when the booster pump 111 is in the normal mode. It can be understood that the lower limit value of the first interval is greater than 0; and its upper limit value is less than or equal to the rated flow rate of the gas water heater 100. In an example, the first interval can be [2.5, 13], and its unit is L / min. After the gas water heater 100 enters the waterfall mode, it ignites and works. Generally speaking, the water temperature in the water supply pipeline 110 of the gas water heater 100 is relatively low at this time, which is approximately equal to the ambient temperature. Specifically, it will generally be lower than 43 degrees. The flow sensor 114 detects the flow of the water flow in the water supply pipeline 110 in real time, assuming that the current flow of the water flow is 8L / min. The flow sensor 114 will send a corresponding flow signal to the controller 130. After receiving the flow signal, the controller 130 determines that the flow of the water flow is within the first interval at this time. Thus, the controller 130 can control the booster pump 111 to start and pressurize the water flow in the water supply pipeline 110 with a first head higher than the rated head. With the start-up of the booster pump 111, the flow of the water flow in the water supply pipeline 110 will instantly increase. Exemplarily, the flow of the water flow can be increased to 15L / min. Thus, the water flow of the gas water heater 100 can exceed the rated flow.

[0049] In the above technical solution, the flow sensor 114 is used to detect the flow rate of the water flow in the water supply pipeline 110 in real time. Only when the flow rate of the water flow is in a specific range, the booster pump 111 is controlled to start and operate at a condition exceeding the rated head. This solution avoids the waste of resources by starting the booster pump 111 when the water flow in the water supply pipeline 110 is stationary; and at the same time, it avoids the situation where the booster pump 111 continues to increase the pressure when the flow rate of the water flow in the water supply pipeline 110 is already very large, so that the gas water heater 100 cannot match the corresponding heat load, resulting in the user being unable to use hot water at the desired temperature.

[0050] It is understood that after the booster pump 111 is started, in some cases, the controller 130 can control the booster pump 111 to stop boosting. For example, in response to the user exiting the waterfall mode or shutting down the machine, the controller 130 can control the booster pump 111 to stop boosting.

[0051] Exemplarily, the controller 130 is also used to control the booster pump 111 to stop boosting when the flow rate of the water flow detected by the flow sensor 114 meets the preset conditions. As mentioned above, the flow sensor 114 detects the flow rate of the water flow of the water supply pipeline 110 in real time. The flow rate of the water flow reflects the working condition of the gas water heater 100 to a certain extent. For example, if the flow rate of the water flow is too small, the water supply of the gas water heater 100 may be insufficient, or the user may turn off the water intake device, such as a faucet. For another example, if the flow rate of the water flow is too large, for example, it has exceeded the flow rate corresponding to the first head of the booster pump 111, then there is no need to continue boosting with the booster pump 111. In these cases, the controller 130 can control the booster pump 111 to stop boosting. In the example where the first interval is [2.5, 13] L / min, when the flow rate of water in the water supply pipe 110 is less than the lower limit of the first interval 2.5 L / min or greater than or equal to 16 L / min, the controller 130 can control the boost pump 111 to stop boosting.

[0052] In the above technical solution, the booster pump 111 is controlled to stop boosting according to the flow rate of water in the water supply pipeline 110, thereby realizing accurate automatic control of the booster pump 111 in the gas water heater 100 and reducing manual operations of the user.

[0053] Optionally, the controller 130 controls the booster pump 111 to stop boosting when the flow rate of the water flow meets the preset condition, which may include performing a first operation. The first operation specifically includes: first determining whether the flow rate of the water flow is greater than or equal to the preset flow rate. Then, when the flow rate of the water flow is greater than or equal to the preset flow rate, controlling the booster pump 111 to stop boosting. It can be understood that the preset flow rate may be a flow value preset according to the operating parameters of the booster pump 111 and other devices before the gas water heater 100 leaves the factory. The preset flow rate may be equal to or slightly less than the flow rate corresponding to the first head of the booster pump 111. In an embodiment in which the controller 130 performs the first operation, the preset condition is that the flow rate of the water flow in the water supply pipeline 110 is greater than or equal to the preset flow rate. When the flow rate of the water flow in the water supply pipeline 110 is already too large, it is difficult for the boosting operation of the booster pump 111 to further boost the water flow.

[0054] In the example where the first interval is [2.5,13] L / min, the preset flow rate can be 16 L / min. The flow sensor 114 detects the current flow rate of the water flow in the water supply pipeline 110. Assume that the detection result is 17 L / min. The flow sensor 114 transmits the flow signal to the controller 130. After receiving the flow signal, the controller 130 determines that the flow rate of the water flow at this time is greater than the preset flow rate and meets the preset condition. Therefore, the controller 130 can control the boost pump 111 to stop boosting.

[0055] In the above technical solution, the booster pump 111 is controlled to stop boosting based on whether the flow rate of the water flow is greater than or equal to the preset flow rate. Thus, unnecessary work of the booster pump 111 is avoided, resources are saved and the service life of the booster pump 111 is extended.

[0056] Optionally, the controller 130 may control the booster pump 111 to stop boosting when the flow rate of the water flow meets the preset conditions, and may also include performing a second operation. The second operation specifically includes: firstly storing the flow rate of the water flow at a first preset frequency; then calculating the flow difference between the currently stored flow rate and the flow rate stored at the previous moment. Finally, determining whether the flow difference is greater than a flow threshold, and when the flow difference is greater than the flow threshold, controlling the booster pump 111 to stop boosting.

[0057] It can be understood that the first preset frequency and flow threshold value can be parameter values ​​preset before the gas water heater 100 leaves the factory. The first preset frequency is, for example, 0.1 to 2 times / second. The flow threshold value can be set according to the rated flow of the gas water heater 100, for example, 1 to 10L / min. The larger the rated flow of the gas water heater 100, the larger the flow threshold value can be; otherwise, vice versa. In the embodiment in which the controller 130 performs the second operation, the preset condition is that the flow difference between the flow detected at the current moment and the flow detected at the previous moment is greater than the flow threshold value. In this embodiment, the flow sensor 114 is used to detect the flow of the water flow in the water supply pipeline 110 in real time, and the detected flow is stored at the first preset frequency. When the flow difference between the flow stored at the current moment and the flow stored at the previous moment is greater than the flow threshold value, the flow of the water flow in the water supply pipeline 110 suddenly drops. This may be caused by the user stopping the water extraction. Therefore, at this time, the booster pump 111 can be controlled to stop boosting.

[0058] In the example where the first interval is [2.5, 13] L / min, assuming that the first preset frequency is 1 second / time, the flow threshold is 2 L / min, the flow rate of the water flow stored at the current moment is, for example, 11 L / min, and the flow rate stored in the previous second is 14 L / min. The controller 130 can calculate the flow difference as 14-11=3 L / min. It is determined that the flow difference of 3 L / min is greater than the flow threshold of 2 L / min. As a result, the controller 130 controls the boost pump 111 to stop boosting.

[0059] In the above technical solution, the user stops taking water based on the instantaneous change of the water flow, and then controls the booster pump 111 to stop boosting. Therefore, the booster pump 111 is stopped promptly and accurately when the user stops taking water, effectively saving resources.

[0060] It is understood that for the same gas water heater 100, the controller 130 can control the booster pump 111 to stop boosting based on different preset conditions. For example, for the gas water heater 100, when the flow rate of the water flow is greater than or equal to the preset flow rate or the flow rate decreases significantly instantaneously, the booster pump 111 can be controlled to stop boosting. It is understood that the above two different embodiments are used to illustrate different preset conditions, which are only examples and do not constitute a limitation to the present invention.

[0061] Exemplarily, the water supply pipeline 110 may include a first interface 112 and a second interface 113. The first interface 112 and the second interface 113 are used to connect to the two ends of the external pipeline of the gas water heater 100. Thus, the external pipeline and the water supply pipeline 110 together constitute a circulation pipeline. In other words, the water flow can flow in a closed loop in the external pipeline and the water supply pipeline 110. It can be understood that the circulation pipeline may include a third interface for connecting to the municipal pipeline so that the municipal pipeline provides water for the gas water heater 100. The third interface can also be called the water inlet of the water supply pipeline 110. The water inlet can be the same interface as the first interface 112 or the second interface 113. Figure 1 In the illustrated gas water heater 100, the water inlet is the first interface 112, and the water supply pipeline 110 is connected at the first interface 112 to one end of an external pipeline forming a closed pipeline with the water supply pipeline, and is also connected to a municipal pipeline providing water for the gas water heater 100. The external pipeline may be provided with one or more water outlets, such as one or more water outlets connected to faucets. Users can use these faucets to take the water heated by the combustion water heater.

[0062] For the circulation pipeline, the booster pump 111 can be used to drive the water flow therein and preheat the water flow, thereby realizing the zero cold water function of the gas water heater 100. In other words, with the introduction of the booster pump 111, the preheating of the circulation water circuit provides a solution for users to use hot water at any time.

[0063] The gas water heater 100 may further include a first temperature sensor 115. The first temperature sensor 115 may be disposed at the water inlet of the gas water heater 100, and is used to detect the water flow temperature of the water inlet of the water supply pipeline 110, that is, the water inlet temperature. The controller 130 may also be used to: first, time the time for the boosting pump 111 to increase pressure. When the counted time is the first time, store the water flow temperature of the water inlet, and then calculate the first temperature difference between the current water flow temperature of the water inlet and the stored water flow temperature of the water inlet. Finally, determine whether the first temperature difference is greater than or equal to the first temperature threshold; when the first temperature difference is greater than or equal to the first temperature threshold, control the boosting pump 111 to stop increasing pressure.

[0064] In this embodiment, the controller 130 controls the booster pump 111 to start pressurizing the water flow in the water supply pipeline 110 with the first head, and then starts timing immediately. The time counted is the current working time of the booster pump 111. The first time can be preset before the gas water heater 100 leaves the factory. The first time is, for example, a duration of 10 to 30 seconds. When the booster pump 111 has been running stably for the first time, it can be considered that the temperature of the water flow at the water inlet has been relatively stable. For example, when the booster pump 111 starts to start, the temperature of the water flow at the water inlet is substantially equal to the temperature of the room where the gas water heater 100 is located. When the counted time is the first time, the temperature of the water flow at the water inlet is substantially equal to the temperature of the water flow in the municipal pipeline. At this time, the water flow temperature of the water inlet, that is, the water flow temperature T1 at the first time, can be stored. In the subsequent time, the first temperature difference between the water inlet temperature and the water flow temperature T1 detected in real time by the first temperature sensor 115 is calculated at a second preset frequency. And, it is determined whether the first temperature difference is greater than or equal to the first temperature threshold. The first temperature threshold may be pre-set before the gas water heater 100 leaves the factory, for example, 8 to 15 degrees. If the first temperature difference is greater than or equal to the first temperature threshold, that is, the current water inlet temperature is significantly greater than the temperature of the water flow from the municipal pipeline, this means that the water flow heated by the burner 122 is circulated back to the water inlet through the water supply pipeline 110 and the peripheral pipeline. At this time, the water flow at the water inlet does not originate from the municipal pipeline, so its temperature is significantly higher than the water flow temperature T1. As a result, the water flow heated by the burner 122 does not flow out through the user's faucet. The controller 130 can determine that the user stops taking water, and then control the boost pump 111 to stop pressurizing.

[0065] In one example, the water flow temperature at the water inlet stored by the controller 130 20 seconds after the boost pump 111 is started is 29°C. The current water flow temperature at the water inlet detected by the first temperature sensor 115 is, for example, 50 degrees. The first temperature threshold is, for example, 10 degrees. The first temperature sensor 115 transmits the current water flow temperature at the water inlet to the controller 130. After receiving the water flow temperature signal, the controller 130 calculates the first temperature difference as 50-29=21 degrees, and judges that the first temperature difference is greater than the first temperature threshold. Therefore, the controller 130 can control the boost pump 111 to stop boosting at the current moment.

[0066] In the above technical solution, the boosting pump 111 is controlled to stop boosting according to the change of the water inlet temperature after the boosting pump 111 is started. Therefore, the user's operation of stopping water extraction is accurately judged, and the boosting pump 111 is accurately and automatically controlled to stop boosting after the user stops taking water, reducing the user's manual operation.

[0067] In the above technical solution, the water flow at the water inlet is determined to be the heated hot water returning in the circulation pipeline based on the fact that the water inlet temperature is significantly higher than the temperature of the water flow provided by the municipal pipeline. However, in some cases, the temperature of the hot water returning in the circulation pipeline may not be much higher than the temperature of the water flow in the municipal pipeline. For example, in summer, because the ambient temperature is high, the temperature of the water flow in the municipal pipeline is also relatively high. The expected temperature set by the user may be lower. Therefore, the difference between the temperature of the heated hot water returning in the circulation pipeline and the temperature of the water flow in the municipal pipeline may not reach the first temperature threshold. Furthermore, in this case, it is impossible to control the boost pump 111 to stop the boosting based on the fact that the water inlet temperature is significantly higher than the temperature of the water flow provided by the municipal pipeline.

[0068] In order to solve the problem in the above solution, illustratively, the controller 130 can also be used to: first, calculate the second temperature difference between the expected temperature and the current water flow temperature of the water inlet. Then, determine whether the second temperature difference is less than or equal to the second temperature threshold. Finally, when the second temperature difference is less than or equal to the second temperature threshold, control the booster pump 111 to stop boosting. The second temperature threshold can be a preset value of the gas water heater 100 before leaving the factory, for example, 3 to 8 degrees.

[0069] As mentioned above, the water supply pipeline 110 and the peripheral pipeline together constitute a circulating water circuit. The controller 130 can pressurize the water flow in the circulating water circuit through the booster pump 111, or calculate the difference between the user's expected temperature and the water inlet temperature through the temperature signal detected by the first temperature sensor 115 as the second temperature difference. Whether the water inlet temperature is close to the expected temperature is determined based on the second temperature difference. If it is close to the expected temperature, it means that the water flow heated by the burner 122 is circulated back to the water inlet through the water supply pipeline 110 and the peripheral pipeline. At this time, the water flow at the water inlet is also not derived from the municipal pipeline, so its temperature is close to the expected temperature set by the user. As a result, the water flow heated by the burner 122 does not flow out through the user's faucet. The controller 130 can determine that the user stops taking water, thereby controlling the booster pump 111 to stop pressurization.

[0070] In one example, the first temperature sensor 115 detects that the current water flow temperature of the water inlet is, for example, 38 degrees. The water flow temperature of the water inlet stored by the controller 130 20 seconds after the booster pump 111 is started is 29 degrees. The desired temperature pre-set by the user using the input device is, for example, 40 degrees. The first temperature threshold is still 10 degrees. The second temperature threshold is, for example, 5 degrees. The first temperature sensor 115 transmits the current water flow temperature of the water inlet to the controller 130. After receiving the temperature signal, the controller 130 calculates the second temperature difference as 40-38=2 degrees. It is determined that the second temperature difference is less than the second temperature threshold. As a result, the controller 130 controls the booster pump 111 to stop boosting. It can be understood that in this example, the first temperature difference is equal to 38-29=9 degrees. According to the first temperature difference, the operation of controlling the booster pump 111 to stop boosting is not performed.

[0071] The above technical solution is an effective supplement to the technical solution of controlling the boosting pump 111 to stop boosting according to the change of the inlet water temperature after the boosting pump 111 is started, and uses the difference between the expected temperature and the inlet water temperature to judge the user's operation of stopping water collection. This ensures that the boosting pump 111 can be controlled to stop boosting without error after the user stops taking water in any temperature environment.

[0072] After the controller 130 controls the boost pump 111 to increase the pressure, the water flow rate increases. If the gas water heater 100 still maintains the original heat load, the desired temperature set by the user will be difficult to reach. Therefore, the controller 130 controls the gas proportional valve 121 to work under the first working condition to increase the heat load of the gas water heater 100.

[0073] Exemplarily, the controller 130 controlling the gas proportional valve 121 to operate under the first operating condition may include performing the following operations: controlling the gas proportional valve 121 to operate under a first power supply current, wherein the first power supply current is greater than the rated power supply current of the gas proportional valve 121. The gas proportional valve 121 may be operated under different operating conditions by adjusting the power supply current. When operating under different power supply currents, the opening of the gas proportional valve 121 is different, and thus, the gas flow through the gas proportional valve 121 is also different. Specifically, the controller 130 may control the gas proportional valve 121 to operate under the first power supply current. The first power supply current is greater than its rated power supply current. As a result, the ventilation speed of the gas proportional valve 121 is accelerated, and more gas enters the burner 122 of the gas water heater 100 per unit time. The heat load of the gas water heater 100 will be greater than its rated heat load.

[0074] In the above technical solution, the controller 130 adjusts the power supply current of the gas proportional valve 121 to adjust the real-time thermal power of the burner 122, thereby increasing the thermal load of the gas water heater 100. This not only provides users with a good experience of ensuring constant temperature hot water output of the gas water heater 100 when taking hot water at a large flow rate, but is also easy to implement.

[0075] Exemplarily, the controller 130 controls the gas proportional valve 121 to work under the first working condition, which may include the following operations: controlling the boosting device to boost the gas passing through the gas proportional valve 121, wherein the boosting device is arranged inside the gas proportional valve 121. Whether the boosting device is started or not significantly affects the ventilation volume of the gas proportional valve 121. After starting, the boosting device can directly increase the ventilation volume, thereby correspondingly accelerating the gas supply speed of the burner 122 of the gas water heater 100. When the gas proportional valve 121 is at a relatively large opening, for example, when its power supply current is the rated power supply current, starting the boosting device in the valve body of the gas proportional valve 121 can enable the gas proportional valve 121 to exceed its ventilation volume corresponding to the power supply current, thereby making the heat load of the gas water heater 100 greater than the rated heat load.

[0076] In the above technical solution, the controller 130 adjusts the real-time thermal power of the burner 122 by starting the booster device in the valve body of the gas proportional valve 121, thereby increasing the thermal load of the gas water heater 100. This not only provides users with a good experience of ensuring constant temperature hot water output of the gas water heater 100 when taking hot water at a large flow rate, but also has a simple control logic.

[0077] Exemplarily, the gas water heater 100 further includes a second temperature sensor 116. The second temperature sensor 116 may be disposed at the water outlet of the gas water heater 100, and is used to detect the water flow temperature of the water outlet of the water path, referred to as the outlet water temperature. The controller 130 controls the gas proportional valve 121 to operate under the first working condition, which may include performing the following operations: based on the desired temperature and the water flow temperature at the water outlet, PID control is performed on the first power supply current of the gas proportional valve 121 or the power of the booster device, so that the outlet water temperature of the gas water heater 100 reaches the desired temperature.

[0078] In one embodiment, the first operating condition of the gas proportional valve 121 may correspond to one or more first power supply current values ​​thereof. These first power supply current values ​​are all greater than the power supply current of the gas proportional valve 121. In another embodiment, the first operating condition of the gas proportional valve 121 may correspond to one or more power values ​​of its booster device. Based on the difference between the desired temperature and the water flow temperature at the water outlet, PID control may be performed on the first power supply current of the gas proportional valve 121 or the power of the booster device therein. Exemplarily, when the outlet water temperature is greater than or equal to the desired temperature, the controller 130 reduces the power supply current of the gas proportional valve 121. When the outlet water temperature is less than the desired temperature, the controller 130 increases the power supply current of the gas proportional valve 121, thereby continuously adjusting the heat load of the gas water heater 100.

[0079] In the above technical solution, the controller 130 performs PID control on the gas proportional valve 121. This ensures that the outlet water temperature of the gas water heater 100 is always stable at the desired temperature set by the user, which significantly improves the user experience.

[0080] Exemplarily, the gas water heater 100 further includes a fan 140 for blowing air into the burner 122 in the gas water heater 100. The air can be mixed with the gas transported via the gas pipeline 120, thereby burning in the burner 122 to generate heat to heat the cold water in the water supply pipeline 110 of the gas water heater 100. The controller 130 can also be used to determine the first speed of the fan 140 and control the fan 140 to operate at the first speed according to the first working condition of the gas proportional valve 121. The more gas passes through the gas proportional valve 121 per unit time under the first working condition, the greater the first speed.

[0081] It is understandable that when the thermal power of the burner 122 increases, the oxygen required for combustion will also increase. If the burner 122 cannot be supplied with sufficient oxygen, the combustion will be incomplete, resulting in more carbon monoxide emissions and reducing the effective thermal power. In order to solve this problem, the controller 130 can control the fan 140 to maintain a higher speed and speed up the air intake speed of the burner 122. In other words, when the gas proportional valve 121 works under the first working condition, the controller 130 can change the power of the fan 140 to increase the speed of the fan 140, thereby increasing the oxygen supply per unit time of the burner 122.

[0082] In the above technical solution, the controller 130 controls the fan 140 to run at a corresponding speed according to the working condition of the gas proportional valve 121. Thus, carbon monoxide emissions are effectively reduced and the effective thermal power of the gas water heater 100 is increased.

[0083] According to another aspect of the present invention, a control method for a gas water heater is also provided. The control method is applicable to the above-mentioned gas water heater. As mentioned above, the gas water heater comprises: a water supply pipeline, a burner and a gas pipeline. The burner is used to heat the water supply pipeline. The gas pipeline is used to transport gas to the burner, and a gas proportional valve and a burner are sequentially connected in series on the gas pipeline along the gas flow direction.

[0084] Figure 2 FIG. 2 is a flow chart showing a control method 200 of a gas water heater according to an embodiment of the present invention. Figure 2 As shown, the control method 200 includes step S210 and step S220.

[0085] In step S210, in response to the user's operation, the booster pump is controlled to boost the water flow in the water supply pipeline with a first head, wherein the booster pump is used to connect the water supply pipeline, and the first head is greater than the rated head of the booster pump.

[0086] In step S220, the gas proportional valve is controlled to operate under the first working condition so that the water flow rate of the gas water heater exceeds the rated flow rate and the water temperature reaches the desired temperature. When the gas proportional valve operates under the first working condition, the heat load of the gas water heater is greater than the rated heat load.

[0087] It is understood that step S210 and step S220 can be executed successively or simultaneously. This application does not limit this. In the above control method, the controller controls the booster pump to pressurize the water flow in the water supply pipeline with a first head in response to the user's operation, and controls the gas proportional valve to operate under the first working condition so that the water outlet flow of the gas water heater exceeds the rated flow and the water outlet temperature reaches the desired temperature.

[0088] Exemplarily, the gas water heater further includes a fan for blowing air into the burner. The control method further includes: according to the first working condition of the gas proportional valve, determining a first speed of the fan and controlling the fan to operate at the first speed, wherein the more gas volume passes through the gas proportional valve per unit time under the first working condition, the greater the first speed.

[0089] Exemplarily, the gas water heater further includes a flow sensor for detecting the flow of water in the water supply pipeline. The controlling the booster pump to pressurize the water in the water supply pipeline with a first head includes: judging whether the flow of the water is in a first interval, wherein the lower limit of the first interval is greater than 0 liters / minute and the upper limit is less than or equal to the rated flow; when the flow of the water is in the first interval, controlling the booster pump to start and pressurize the water in the water supply pipeline with the first head.

[0090] Exemplarily, the control method further includes: when the flow rate of the water flow meets a preset condition, controlling the boosting pump to stop boosting.

[0091] Exemplarily, controlling the boosting pump to stop boosting when the flow rate of the water flow meets a preset condition includes performing a first operation and / or a second operation.

[0092] The first operation includes: determining whether the flow rate of the water flow is greater than or equal to a preset flow rate; and when the flow rate of the water flow is greater than or equal to the preset flow rate, controlling the boosting pump to stop boosting.

[0093] The second operation includes: storing the flow rate of water flow at a first preset frequency; calculating the flow difference between the currently stored flow rate and the flow rate stored at the previous moment; determining whether the flow difference is greater than a flow threshold; and when the flow difference is greater than the flow threshold, controlling the boosting pump to stop boosting.

[0094] Exemplarily, the water supply pipeline includes a first interface and a second interface. The first interface and the second interface are used to connect to both ends of the external pipeline of the gas water heater. The gas water heater also includes a first temperature sensor, which is used to detect the water flow temperature of the water inlet of the water supply pipeline.

[0095] The control method also includes: timing the boosting time of the boost pump; when the counted time is the first time, storing the water flow temperature of the water inlet; calculating a first temperature difference between the current water flow temperature of the water inlet and the stored water flow temperature of the water inlet; determining whether the first temperature difference is greater than or equal to a first temperature threshold; and controlling the boost pump to stop boosting when the first temperature difference is greater than or equal to the first temperature threshold.

[0096] Exemplarily, the control method also includes: calculating a second temperature difference between the expected temperature and the current water flow temperature at the water inlet; determining whether the second temperature difference is less than or equal to a second temperature threshold; and controlling the boost pump to stop boosting when the second temperature difference is less than or equal to the second temperature threshold.

[0097] Exemplarily, controlling the gas proportional valve to operate under a first operating condition includes: controlling the gas proportional valve to operate under a first power supply current, wherein the first power supply current is greater than a rated power supply current of the gas proportional valve; or controlling a boosting device to boost the gas passing through the gas proportional valve, wherein the boosting device is disposed in the gas proportional valve.

[0098] Exemplarily, the gas water heater further includes a second temperature sensor, which is used to detect the water flow temperature of the water outlet of the water supply pipeline. Controlling the gas proportional valve to operate under the first working condition includes: based on the expected temperature and the water flow temperature of the water outlet, performing proportional-integral-differential control on the first power supply current of the gas proportional valve or the power of the booster device, so that the water outlet flow of the gas water heater exceeds the rated power and the water outlet temperature reaches the expected temperature.

[0099] Figure 3FIG. 3 is a flow chart showing a control method 300 of a gas water heater according to another embodiment of the present invention. Figure 3 As shown, the control method 300 includes the following steps.

[0100] First, in response to the user's operation, the waterfall mode of the gas water heater is started. It is determined whether the flow rate of the water flow in the water supply pipeline is greater than or equal to 2.7L / min. If it is greater than or equal to 2.7L / min, it means that the user has opened the faucet normally and the ignition and heating operation of the gas water heater can be performed. If it is less than 2.7L / min, the user may not have opened the faucet and the ignition and heating operation is not performed. Optionally, in this case, the waterfall mode can be terminated directly. Alternatively, a timer can be started from the start of the waterfall mode. If the counted time exceeds a specific time, such as 5 minutes, and the flow rate of the water flow in the water supply pipeline is never greater than or equal to 2.7L / min, the waterfall mode can be terminated. After the gas water heater is ignited, it is determined whether the flow rate of the water flow currently detected by the flow sensor is greater than or equal to 16L / min. If it is greater than or equal to 16L / min, the booster pump is controlled to stop boosting and the waterfall mode is terminated. If it is less than 16L / min, it is continued to determine whether the flow rate of the water flow in the water supply pipeline is in the first interval [2.5,13]. If it is within this first interval, the booster pump is controlled to increase pressure with a first head, and the first head is greater than the rated flow rate of the booster pump, so that the water outlet flow of the gas water heater exceeds the rated flow rate. At the same time when the booster pump starts to increase pressure with the first head, the timing operation starts. When the counted time is equal to 20 seconds, the water inlet temperature T1 is stored. In addition, at the same time when the booster pump starts to increase pressure, the power supply current of the gas proportional valve is controlled according to the water outlet temperature and the desired temperature T2. The power supply current is greater than the rated power supply current of the gas proportional valve, so that the gas proportional valve works under the first working condition. Thereby, the water outlet temperature of the gas water heater is controlled to reach the desired temperature. At this time, the heat load of the gas water heater is greater than the rated heat load. In addition, the fan can also be controlled according to the power supply current of the gas proportional valve to achieve wind speed compensation for the burner. During this process, it is detected whether the user has finished taking water. According to Figure 3In the embodiment, it is determined whether the flow rate of water in the water supply pipeline drops by 2L / min within 1 second. If it drops by 2L / min within 1 second, the booster pump can be controlled to stop boosting and the waterfall mode is terminated. If it does not drop by 2L / min within 1 second, it is determined whether the inlet water temperature reaches the aforementioned T1+10 degrees. If it reaches the aforementioned T1+10 degrees, the booster pump can be controlled to stop boosting and the waterfall mode is terminated. If it does not reach the aforementioned T1+10 degrees, it is possible to continue to determine whether the inlet water temperature reaches the aforementioned T2-5 degrees. If it reaches the aforementioned T2-5 degrees, the booster pump can be controlled to stop boosting and the waterfall mode is terminated. If it does not reach the aforementioned T2-5 degrees, it returns to re-determine whether the flow direction of the water in the water supply pipeline is greater than 16L / min, and continue with the subsequent process.

[0101] A person skilled in the art can understand the specific steps and technical effects of the control method of the gas water heater by reading the above detailed description of the gas water heater 100, and will not be described in detail here for the sake of brevity.

[0102] It should be noted that the terms used herein are only for describing specific embodiments and are not intended to limit the exemplary embodiments according to the present application. As used herein, unless the context clearly indicates otherwise, the singular form is also intended to include the plural form. In addition, it should be understood that when the terms "comprise" and / or "include" are used in this specification, it indicates the presence of features, steps, operations, parts, components and / or combinations thereof.

[0103] It should be noted that the terms "first", "second", etc. in the specification and claims of the present application and the above-mentioned drawings are used to distinguish similar objects, and are not necessarily used to describe a specific order or sequence. It should be understood that the numbers used in this way can be interchanged where appropriate, so that the embodiments of the present application described herein can be implemented in an order other than those illustrated or described herein.

[0104] The present invention has been described by the above embodiments, but it should be understood that the above embodiments are only for the purpose of example and description, and are not intended to limit the present invention to the scope of the described embodiments. In addition, it can be understood by those skilled in the art that the present invention is not limited to the above embodiments, and more variations and modifications can be made according to the teachings of the present invention, and these variations and modifications all fall within the scope of the protection claimed by the present invention. The protection scope of the present invention is defined by the attached claims and their equivalents.

Claims

1. A gas water heater, characterized in that: include: Water supply pipelines; a burner for heating the water supply pipeline; A gas pipeline for conveying gas to the burner, wherein a gas proportional valve and a burner are sequentially connected in series along the gas flow direction on the gas pipeline; as well as A controller, used for: in response to user operation, controlling the booster pump to boost the water flow in the water supply pipeline with a first head, controlling the gas proportional valve to operate under a first working condition, so that the water outlet flow of the gas water heater exceeds the rated flow and the water outlet temperature reaches a desired temperature, wherein the booster pump is used to connect the water supply pipeline, the first head is greater than the rated head of the booster pump, and when the gas proportional valve operates under the first working condition, the heat load of the gas water heater is greater than the rated heat load.

2. The gas water heater according to claim 1, characterized in that: The gas water heater also includes a fan for blowing air into the burner; The controller is also used to determine the first speed of the fan and control the fan to operate at the first speed according to the first operating condition of the gas proportional valve, wherein the more gas passes through the gas proportional valve per unit time under the first operating condition, the greater the first speed.

3. The gas water heater according to claim 1, characterized in that: The gas water heater further comprises a flow sensor for detecting the flow of water in the water supply pipeline; The controller controls the booster pump to boost the water flow in the water supply pipeline with a first head, including performing the following operations: Determining whether the flow rate of the water flow is in a first interval, wherein a lower limit value of the first interval is greater than 0 liters / minute and an upper limit value is less than or equal to the rated flow rate; When the flow rate of the water flow is in the first interval, the booster pump is controlled to start and boost the pressure of the water flow in the water supply pipeline at the first head.

4. The gas water heater according to claim 3, characterized in that: The controller is also used to control the booster pump to stop boosting when the flow rate of the water flow meets a preset condition.

5. The gas water heater according to claim 4, characterized in that: When the flow rate of the water flow meets the preset condition, the controller controls the boosting pump to stop boosting, including performing a first operation and / or a second operation, wherein: The first operation includes: Determining whether the flow rate of the water flow is greater than or equal to a preset flow rate; When the flow rate of the water flow is greater than or equal to the preset flow rate, controlling the booster pump to stop boosting; The second operation includes: storing the flow rate of the water flow at a first preset frequency; Calculate the flow difference between the current stored flow and the flow stored at the previous moment; Determining whether the flow difference is greater than a flow threshold; and When the flow difference is greater than the flow threshold, the boost pump is controlled to stop boosting.

6. The gas water heater according to claim 1, characterized in that: The water supply pipeline includes a first interface and a second interface, the first interface and the second interface are used to connect to the two ends of the external pipeline of the gas water heater, and the gas water heater also includes a first temperature sensor, the first temperature sensor is used to detect the water flow temperature of the water inlet of the water supply pipeline, The controller is also used for: Timing the time for the boosting pump to increase pressure; When the counted time is the first time, storing the water flow temperature of the water inlet; Calculating a first temperature difference between a current water flow temperature at a water inlet and a stored water flow temperature at the water inlet; Determining whether the first temperature difference is greater than or equal to a first temperature threshold; When the first temperature difference is greater than or equal to the first temperature threshold, the boost pump is controlled to stop boosting.

7. The gas water heater according to claim 6, characterized in that: The controller is also used for: Calculate a second temperature difference between the expected temperature and the current water flow temperature of the water inlet; Determining whether the second temperature difference is less than or equal to a second temperature threshold; When the second temperature difference is less than or equal to the second temperature threshold, the boost pump is controlled to stop boosting.

8. The gas water heater according to any one of claims 1 to 7, characterized in that: The controller controls the gas proportional valve to operate under the first working condition, including performing the following operations: Controlling the gas proportional valve to operate under a first power supply current, wherein the first power supply current is greater than a rated power supply current of the gas proportional valve; or A pressure boosting device is controlled to increase the pressure of the gas passing through the gas proportional valve, wherein the pressure boosting device is arranged in the gas proportional valve.

9. The gas water heater according to claim 8, characterized in that: The gas water heater further comprises a second temperature sensor, which is used to detect the water flow temperature at the water outlet of the water supply pipeline. The controller controls the gas proportional valve to operate under the first working condition, including performing the following operations: Based on the desired temperature and the water flow temperature of the water outlet, the first power supply current of the gas proportional valve or the power of the booster device is controlled by proportional integral differential so that the water outlet flow of the gas water heater exceeds the rated power and the water outlet temperature reaches the desired temperature.

10. A method for controlling a gas water heater, characterized in that: The gas water heater comprises: a water supply pipeline, a burner for heating the water supply pipeline, a gas pipeline for conveying gas to the burner, and a gas proportional valve and a burner are sequentially connected in series on the gas pipeline along the air flow direction; The control method comprises: In response to a user's operation, controlling a booster pump to boost the water flow in the water supply pipeline with a first head, wherein the booster pump is used to connect the water supply pipeline, and the first head is greater than a rated head of the booster pump; The gas proportional valve is controlled to operate under a first operating condition so that the water outlet flow of the gas water heater exceeds the rated flow and the water outlet temperature reaches a desired temperature, wherein when the gas proportional valve operates under the first operating condition, the heat load of the gas water heater is greater than the rated heat load.

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