Gas water heater

Abstract

The utility model provides a gas water heater, including a combustion gas circuit and a gas sensor; wherein a burner and a fan are sequentially arranged on the combustion gas circuit, and the exhaust port of the fan is connected to the gas outlet of the gas water heater; the gas sensor is arranged outside the combustion gas circuit, and is used to detect the gas concentration and generate a gas concentration signal; the fan includes a motor, which is a brushless motor and is electrically connected to the gas sensor, and the motor is constructed to operate under the control of the gas concentration signal emitted by the gas sensor. The above-mentioned gas water heater can ensure that when a gas leak occurs, the exhaust operation can be automatically performed immediately without user intervention, so as to reduce the gas concentration and avoid gas explosion; no matter where the gas leak accident occurs in the gas pipeline, the gas leak accident can be handled.

Description

Technical Field

[0001] The utility model relates to the technical field of household appliances, in particular to a gas water heater. Background Art

[0002] Gas water heaters use gas combustion to heat water, and they can quickly provide a large amount of hot water, making them popular. However, gas leaks occasionally occur due to equipment life, pests, or installation factors, which requires gas leak alarm technology.

[0003] In the existing gas leak alarm technology, if a gas leak is found, a buzzer alarm is used to notify the user to intervene manually; or the gas valve is closed to cut off the gas source.

[0004] However, in the above-mentioned existing gas leak alarm technology, if only a buzzer is used to alarm, if the user does not respond in time, the safety hazard cannot be quickly eliminated. If the gas valve is closed when the gas leaks, if the gas pipeline upstream of the gas valve leaks, closing the gas valve still cannot solve the gas leakage problem. In short, the existing gas leak alarm technology is still difficult to perfectly solve the gas leakage problem. Utility Model Content

[0005] In order to at least partially solve the problems existing in the prior art, according to one aspect of the utility model, a gas water heater is provided, and the technical solution is as follows.

[0006] The gas water heater includes a combustion gas circuit and a gas sensor; wherein a burner and a fan are sequentially arranged on the combustion gas circuit, and an exhaust port of the fan is connected to an outlet of the gas water heater; the gas sensor is arranged outside the combustion gas circuit, and is used to detect the gas concentration and generate a gas concentration signal; the fan includes a motor, which is a brushless motor and is electrically connected to the gas sensor, and the motor is constructed to operate under the control of the gas concentration signal emitted by the gas sensor.

[0007] The motor in the fan of the gas water heater of the utility model is used to exhaust the waste gas generated by the combustion of gas in the burner and to exhaust the leaked gas. The above-mentioned gas water heater can not only ensure that when a gas leak occurs, the exhaust operation can be automatically performed immediately without user intervention, thereby reducing the gas concentration and avoiding gas explosion; but also, no matter where the gas leak accident occurs in the gas pipeline, the gas leak accident can be handled. In addition, the motor is implemented using a brushless motor, which avoids the gas explosion caused by the generation of electric sparks.

[0008] Exemplarily, the gas water heater further includes a controller, which is electrically connected to the gas sensor and the motor; the controller is used to control the motor to start or stop running based on the gas concentration signal sent by the gas sensor. The motor can be reasonably controlled to start or stop running through the controller.

[0009] In the above gas water heater, the motor can be reasonably controlled to start or stop running by the controller. On the one hand, the controller ensures the control accuracy of the motor; on the other hand, the controller supports additional setting of the control logic of the motor.

[0010] Exemplarily, the gas water heater further includes an input device, the input device is electrically connected to the controller, and the controller is further used to determine that the operation state of the fan is normal according to the input instruction input by the input device. The controller controls the motor to start based on the gas concentration signal only when the operation state of the fan is normal.

[0011] In the above gas water heater, the controller can determine that the operation state of the fan is normal according to the input command, and then control the motor to start according to the gas concentration signal only when the operation state of the fan is normal. This successfully avoids the electric spark generated by foreign matter in the fan, which causes the leaked gas to explode.

[0012] Exemplarily, the input device includes a plurality of keys.

[0013] By generating input instructions to determine that the operation status of the extension is normal through multiple keys, it successfully avoids the user from inputting the above input instructions incorrectly due to accidental touch or wrong operation. This ensures that when the motor is started and operated in the event of a gas leak, the fan is in a normal operating state, thereby ensuring that electric sparks that may easily cause gas explosions will not be generated due to the operation of the motor. In this way, the safety of the gas water heater is ensured.

[0014] Exemplarily, a gas valve is provided on the combustion gas path and upstream of the burner. The gas valve is electrically connected to the controller. The controller is also used to control the closing of the gas valve based on a gas concentration signal sent by the gas sensor.

[0015] The above technical solution effectively avoids the situation where the gas continues to enter the combustion gas path when a gas leak occurs in the combustion gas path, causing the concentration of the leaked gas to continue to increase and cause deflagration.

[0016] Exemplarily, the gas water heater also includes an alarm; the alarm is electrically connected to a controller, and the controller is further used to control the alarm to send out an alarm signal based on a gas concentration signal sent out by the gas sensor.

[0017] In the above technical solution, an alarm can be used to remind the user of gas leakage, which can be used as a beneficial supplement to the automatic exhaust of the motor and more effectively handle the gas leakage accident.

[0018] Exemplarily, the gas water heater also includes a display; the display is electrically connected to the controller, and the controller is also used to control the display to display alarm information based on the gas concentration signal sent by the gas sensor.

[0019] The above technical solution can use the display to remind the user of the gas leakage problem, so that the user can handle it in time.

[0020] Exemplarily, the gas water heater also includes an air pipe; the air inlet of the air pipe faces the gas sensor, the air outlet of the air pipe faces the air inlet of the fan, and the air pipe is used to form a negative pressure at the gas sensor when the motor is running.

[0021] The above technical solution can speed up the speed at which the gas sensor detects gas leaks, thereby shortening the response time of the motor to gas leak accidents, and avoiding the problem of slow handling of gas leak accidents due to the gas sensor relying solely on the natural diffusion of gas for detection.

[0022] Exemplarily, the gas sensor is disposed in the upper middle portion of the gas water heater.

[0023] In the above technical solution, the gas sensor can detect gas leakage more quickly and accurately. Then, the controller can control the motor to discharge the leaked gas more quickly to avoid gas explosion.

[0024] Exemplarily, the gas water heater further includes a shell, the gas sensor is arranged on the shell, and a ventilation hole is also arranged on the shell, and the distance between the ventilation hole and the gas sensor is less than a preset value.

[0025] The above technical solution ensures that the gas sensor can not only quickly detect gas leakage inside the gas water heater, but also quickly detect gas leakage outside the gas water heater, thereby ensuring the safety of users' lives and property.

[0026] A series of simplified concepts are introduced in the utility model content, which will be further described in detail in the detailed implementation section. The utility model 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.

[0027] The advantages and features of the present invention are described in detail below in conjunction with the accompanying drawings. BRIEF DESCRIPTION OF THE DRAWINGS

[0028] The following drawings of the present invention are used as part of the present invention for understanding the present invention. The drawings show the implementation of the present invention and its description, and are used to explain the principle of the present invention. In the drawings,

[0029] Figure 1A schematic block diagram of a gas water heater according to an exemplary embodiment of the present utility model is shown.

[0030] The above drawings include the following reference numerals:

[0031] 100, gas water heater; 110, combustion gas circuit; 111, burner; 112, fan; 112a, exhaust port; 112b, motor; 112c, air inlet; 113, gas valve; 120, gas sensor; 130, air outlet; 140, controller; 150, input device; 151, multiple buttons; 160, alarm; 170, display; 180, gas pipe; 181, air inlet; 182, air outlet; 190, shell; 191, ventilation hole. DETAILED DESCRIPTION

[0032] In the following description, a large number of details are provided so that the present invention can be thoroughly understood. However, it will be appreciated by those skilled in the art that the following description only illustrates preferred embodiments of the present invention, and the present invention can be implemented without one or more of such details. In addition, in order to avoid confusion with the present invention, some technical features known in the art are not described in detail.

[0033] The embodiment of the present application provides a gas water heater 100. Figure 1 As shown, the gas water heater 100 includes a combustion gas circuit 110 and a gas sensor 120. The combustion gas circuit 110 is provided with a burner 111 and a fan 112 in sequence. The gas water heater 100 may be provided with an air outlet 130. The exhaust port 112a of the fan 112 is connected to the air outlet 130 of the gas water heater 100.

[0034] When the gas water heater 100 is running, the gas can enter the burner 111 and burn. The fan 112 can be used to extract and discharge the waste gas generated after the gas is burned in the burner 111. Specifically, the fan 112 may include a motor 112b and an impeller ( Figure 1112a of the fan 112. It is understood that by the operation of the motor 112b, the above-mentioned exhaust gas can be discharged to the outside of the gas water heater 100 through the air inlet 112c of the fan 112, the exhaust port 112a of the fan, and the air outlet 130 of the gas water heater 100 in sequence. It is understood that the air outlet 130 can be connected to a smoke exhaust facility such as a residential flue. In short, the start-up signal of the gas water heater 100 can be used to control the operation of the motor 112b. In other words, the motor 112b can be operated under the control of the start-up signal of the gas water heater 100.

[0035] The gas sensor 120 is disposed outside the combustion gas path 110 and is used to detect the gas concentration and generate a gas concentration signal.

[0036] The gas sensor 120 may include one or more of a catalytic combustion gas sensor, a semiconductor gas sensor, and an infrared gas sensor.

[0037] The above-mentioned motor 112b can be a brushless motor. A brushless motor uses an electronic commutator to switch the direction of current to achieve continuous rotation of the motor. The electronic commutator can be implemented using a solid-state circuit. The electronic commutator obtains feedback through a Hall sensor or other position sensor based on the position of the motor rotor, and then controls the on and off of the current in the motor winding to achieve directional rotation of the rotor. Since there is no physical contact point to switch the current, no sparks are generated. Exemplarily, the electronic commutator of the brushless motor changes the current direction of the motor winding by controlling the switching state of a transistor (usually a MOSFET or an IGBT), and the whole process is very fast and smooth, and no sparks are generated.

[0038] The motor 112b can be electrically connected to the gas sensor 120 and is configured to operate under the control of the gas concentration signal emitted by the gas sensor 120. When the gas sensor 120 detects gas outside the combustion gas path 110, it can generate a corresponding gas concentration signal. The gas concentration signal can indicate that a gas leak has occurred. The motor 112b can be controlled to start based on the gas concentration signal, thereby driving the impeller of the fan 112 to rotate and start exhausting to discharge the leaked gas through the gas outlet 130 of the gas water heater 100. In a specific embodiment, when the gas concentration detected by the gas sensor 120 is higher than a first threshold value, the gas concentration signal generated by the gas sensor 120 is a high level; when the gas concentration detected by the gas sensor 120 is lower than or equal to the first threshold value, the gas concentration signal generated by the gas sensor 120 is a low level. Under the control of a high-level gas concentration signal, the motor 112b can start to run; and under the control of a low-level gas concentration signal, the motor 112b stops running.

[0039] As mentioned above, even if the motor 112b as a brushless motor is started, it will not generate electric sparks, so this ensures that even if there is a gas leak, that is, when the gas concentration is high, it can start and operate normally without igniting the gas.

[0040] In the above-mentioned gas water heater 100, a burner 111 and a fan 112 are sequentially arranged on the combustion gas circuit 110, and the motor 112b included in the fan 112 is a brushless motor, and the brushless motor can operate under the control of the gas concentration signal generated by the gas sensor 120. Therefore, the motor 112b in the fan 112 is used to discharge the exhaust gas generated by the combustion of the gas in the burner 111, and to discharge the leaked gas. The above-mentioned gas water heater 100 can not only ensure that the exhaust operation can be automatically performed immediately without user intervention when a gas leak occurs; but also, no matter where the gas leak occurs in the gas pipeline, the gas leak accident can be handled. In addition, the motor 112b is implemented using a brushless motor, which avoids the gas explosion caused by the generation of electric sparks.

[0041] Exemplarily, the gas sensor 120 is disposed at the middle and upper part of the gas water heater 100. Specifically, the gas sensor 120 can be disposed at the middle and upper part of the top wall or the side wall of the gas water heater 100.

[0042] The gas used by the gas water heater 100 generally includes methane and carbon monoxide. Since the density of methane and carbon monoxide is less than that of air, the leaked gas will diffuse upward and gather at the top. The gas sensor 120 is arranged in the middle and upper part of the gas water heater 100, so that the gas sensor 120 can detect the gas leakage more quickly and accurately. Furthermore, the controller 140 can control the motor 112b to discharge the leaked gas faster to avoid gas explosion.

[0043] Exemplarily, the gas water heater 100 further includes a housing 190. The gas sensor 120 is disposed on the housing 190, and a vent 191 is further disposed on the housing 190, and the distance between the vent 191 and the gas sensor 120 is less than a preset value. It is understood that the preset value may be any distance between 5 and 15 centimeters. For example, the vent 191 may be distributed within a range of 10 centimeters around the gas sensor 120.

[0044] The combustion gas circuit 110 is inside the shell 190, and gas leakage may occur in the combustion gas circuit 110. In addition, the air inlet of the combustion gas circuit 110 is externally connected to a gas pipeline. For example, the gas water heater 100 is installed in the kitchen, and the gas water heater 100 is connected to the municipal gas pipeline via the gas pipeline in the kitchen. Gas leakage may also occur in the gas pipeline outside the gas water heater 100. In the above-mentioned gas water heater 100, the gas sensor 120 is arranged on its shell 190 and a ventilation hole 191 is arranged on the shell 190 and near the gas sensor 120. Therefore, whether there is a gas leakage in the combustion gas circuit 110 inside the gas water heater 100 or a gas leakage in the gas pipeline outside the gas water heater 100, it can be quickly detected by the gas sensor 120.

[0045] In the above-mentioned gas water heater 100, the gas sensor 120 is arranged on the housing 190 of the gas water heater 100, and a vent 191 is arranged in the housing 190 near the gas sensor 120. Thus, it is ensured that the gas sensor 120 can not only quickly detect the gas leakage inside the gas water heater 100, but also can quickly detect the gas leakage outside the gas water heater 100. Thus, the safety of the user's life and property is guaranteed.

[0046] Exemplarily, the gas water heater 100 further includes an air pipe 180. An air inlet 181 of the air pipe 180 faces the gas sensor 120, and an air outlet 182 of the air pipe 180 faces the air inlet 112c of the fan 112. The air pipe 180 is used to form a negative pressure at the gas sensor 120 when the motor 112b is running.

[0047] The natural diffusion speed of gas in the air is slow. If the gas sensor 120 only relies on the natural diffusion of gas to enter the gas sensor 120 for detection, it may not be possible to detect gas leakage in a timely and accurate manner. The fan 112 is used to suck the gas around the gas sensor 120 through the gas pipe 180, thereby forming a negative pressure at the gas sensor 120, which can accelerate the gathering of gas to the gas sensor 120, so as to accelerate the detection of gas leakage accidents.

[0048] In the gas water heater 100, a gas pipe 180 is provided in the gas water heater 100 for forming a negative pressure at the gas sensor 120 when the motor 112b is running. Thus, the speed at which the gas sensor 120 detects a gas leak can be accelerated, thereby shortening the response time of the motor 112b to a gas leak accident, thereby avoiding the problem of slow handling of a gas leak accident due to the gas sensor 120 relying solely on the natural diffusion of the gas for detection.

[0049] Exemplarily, the gas water heater 100 may include a controller 140. The controller 140 may be constructed using electronic components such as timers, comparators, registers, digital logic circuits, or may be implemented using processor chips such as single chip microcomputers, microprocessors, programmable logic controllers (PLCs), digital signal processors (DSPs), field programmable gate arrays (FPGAs), programmable logic arrays (PLA), application specific integrated circuits (ASICs), and their peripheral circuits.

[0050] The controller 140 is electrically connected to the gas sensor 120 and the motor 112 b . The controller 140 can be used to control the motor 112 b to start or stop running based on the gas concentration signal sent by the gas sensor 120 .

[0051] Exemplarily, the controller 140 can determine the gas concentration in the environment where the gas sensor 120 is located according to the gas concentration signal. In a specific embodiment, if the gas concentration exceeds a first threshold value, the controller 140 can control the motor 112b to start so as to discharge the leaked gas through the gas outlet 130 of the gas water heater 100. If the gas concentration is cleared, the motor 112b is controlled to stop running. Optionally, after the motor 112b is started for a first fixed time, if the gas concentration is not cleared, the motor 112b is controlled to stop running. After the motor 112b is controlled to stop running for a second fixed time, if the gas concentration still exceeds the first threshold value, the motor 112b is controlled to start running again to discharge the leaked gas. The above control process can be repeated until the gas concentration is cleared. Optionally, the first fixed time can be any time length from 5 to 20 minutes, such as 10 minutes. The second fixed time can be any time length from 1 to 5 minutes, such as 3 minutes. By controlling the motor 112b to run intermittently, overheating of the motor 112b can be avoided, thereby extending the service life of the gas water heater 100. It can be understood that the above-mentioned gas concentration is reset to zero by the motor 112b driving the impeller of the fan 112 to rotate to exhaust gas. Alternatively, the above-mentioned gas concentration is reset to zero by the user manually closing the gas valve or opening the window for ventilation after discovering a gas leak. Optionally, after the gas concentration exceeds the first threshold, the gas concentration continues to increase and then exceeds the second threshold, then the motor 112b can be immediately controlled to stop running. The second threshold is greater than the first threshold. This can prevent the motor 112b from continuously running and sucking too much gas into the vicinity, resulting in excessive gas concentration, which is easy to cause a gas explosion.

[0052] The gas water heater 100 is provided with a controller 140, so that the motor 112b can be reasonably controlled to start or stop running by the controller 140. On the one hand, the controller 140 ensures the control accuracy of the motor 112b; on the other hand, the controller 140 supports additional setting of the control logic of the motor 112b.

[0053] Exemplarily, the gas water heater 100 may further include an input device 150. The input device 150 may include a button, a touch screen, a mechanical knob, etc. The input device 150 is electrically connected to the controller 140. The controller 140 may also be used to determine that the operating state of the fan 112 is normal according to an input instruction input by using the input device 150. The controller 140 controls the motor 112b to start based on the gas concentration signal only when the operating state of the fan 112 is normal.

[0054] The operating state of the fan 112 indicates whether the fan 112 can operate normally. When the gas water heater 100 is installed for the first time, the installer can first determine that there is no blockage in the fan 112 and there is no foreign matter inside. For example, the installer can start the gas water heater 100 by, for example, opening a faucet connected to the gas water heater 100, and then determine the operating state of the fan 112 based on the sound emitted by the gas water heater 100. After determining that the fan 112 can operate normally, an input device 150 of the gas water heater 100 can be used to input instructions to the gas water heater 100. The input instruction can indicate that the operating state of the fan 112 is normal, that is, the fan 112 can draw air normally, for example, there is no foreign matter inside. The controller 140 can determine that the operating state of the fan 112 is normal based on the input instruction input by the installer using the input device 150.

[0055] It is understood that if the motor 112b of the fan 112 starts running, it will drive the impeller of the fan 112 to rotate. In the case where there is foreign matter in the fan 112, friction and collision may occur between the impeller and the foreign matter, and the friction and collision may cause electric sparks to be generated in the fan. As mentioned above, in addition to being used to discharge the exhaust gas generated in the burner 111, the fan 112 is also used to discharge the leaked gas in the event of a gas leak. Therefore, the above-mentioned electric sparks may cause a gas explosion in the event of a gas leak. Therefore, the normal operating state of the above-mentioned fan 112 determined by the controller 140 can be used to control the start of the motor 112b, that is, as the basis for the controller 140 to control the start of the motor 112b. When the controller 140 determines that the operating status of the fan 112 is normal according to the input instruction, it can control the motor 112b to start according to the gas concentration signal; otherwise, if it is not determined that the operating status of the fan 112 is normal, the motor 112b is not controlled to start according to the gas concentration signal. Therefore, in this case, the fan 112 is only used to discharge the exhaust gas generated in the burner 111.

[0056] The gas water heater 100 includes an input device 150 for inputting an input instruction including an input instruction regarding the normal operation state of the fan 112. The controller 140 can determine that the operation state of the fan 112 is normal according to the input instruction, and then control the motor 112b to start according to the gas concentration signal only when the operation state of the fan 112 is normal. This successfully avoids the occurrence of electric sparks due to the presence of foreign matter in the fan 112, which causes the leaked gas to explode.

[0057] Exemplarily, the input device 150 may include a plurality of buttons 151. An input instruction may be generated by pressing at least two of the plurality of buttons 151 at the same time. For example, the plurality of buttons 151 may include a temperature increase button, a temperature decrease button, a setting button, and a switch button. After the installer determines that the fan 112 can operate normally, the installer may simultaneously press the temperature increase button, the temperature decrease button, and the setting button of the plurality of buttons 151 to generate the above input instruction. The controller 140 may determine that the operating state of the fan 112 is normal according to the input instruction. In this way, the same button can be reused, which improves the utilization rate of components and reduces the cost of the gas water heater 100.

[0058] It is understandable that if an input command is generated by pressing a button, not only does it need to set a separate button for this purpose, which increases the cost of the gas water heater 100, but the fan 112 may be mistakenly recognized as being in a normal state due to mis-touch, erroneous operation, etc. If there is a foreign object in the fan 112, and the fan 112 is mistakenly recognized as being in a normal operating state, when the leaked gas is discharged, electric sparks may be generated due to the foreign object in the fan 112, causing the gas to explode.

[0059] In the above technical solution, input instructions are generated by at least two buttons, which successfully avoids the user from inputting the above input instructions incorrectly due to accidental touch or wrong operation. This ensures that when the motor 112b is controlled to start running in the case of gas leakage, the fan 112 is in a normal operating state, thereby ensuring that electric sparks that may easily cause gas explosions are not generated due to the operation of the motor 112b. In this way, the safety of the gas water heater 100 is ensured.

[0060] Exemplarily, a gas valve 113 is provided on the combustion gas circuit 110. The gas valve 113 is located upstream of the burner 111 in the combustion gas circuit 110 to control the gas to enter the burner 111. The gas valve 113 is electrically connected to the controller 140, and the controller 140 also controls the gas valve 113 to close based on the gas concentration signal sent by the gas sensor 120.

[0061] As described above, the controller 140 can determine the gas concentration in the environment where the gas sensor 120 is located according to the gas concentration signal. The gas valve 113 is located upstream of the combustion gas circuit 110, and the gas inlet can be connected to the municipal gas pipeline to control the gas in the municipal gas pipeline to enter the combustion gas circuit 110 of the gas water heater 100. In a specific embodiment, if the gas concentration exceeds the first threshold, the controller 140 can control the gas valve 113 to close to prevent the gas from continuously entering the combustion gas circuit 110 of the gas water heater 100. It can be understood that the gas leakage may be caused by the damage of the combustion gas circuit 110 and the components arranged thereon. Closing the gas valve 113 to prevent the gas from continuously entering the combustion gas circuit 110 can prevent the gas from continuing to leak.

[0062] In the above-mentioned gas water heater 100, a gas valve 113 is provided on the combustion gas circuit 110 and upstream of the burner 111. The controller 140 can control the gas valve 113 to close according to the gas concentration signal from the gas sensor 120. This effectively prevents the gas from continuing to enter the combustion gas circuit 110 when a gas leak occurs on the combustion gas circuit 110, causing the concentration of the leaked gas to continue to increase and cause deflagration.

[0063] Exemplarily, the gas water heater 100 further includes an alarm 160. The alarm 160 is electrically connected to the controller 140, and the controller 140 is further used to control the alarm 160 to send an alarm signal based on the gas concentration signal sent by the gas sensor 120. The alarm 160 may include a buzzer, an electric bell, an alarm light, and the like.

[0064] The controller 140 may determine the gas concentration in the environment where the gas sensor 120 is located according to the gas concentration signal. Optionally, when the determined gas concentration is higher than a first threshold, the controller 140 may control the alarm 160 to send an alarm signal. Exemplarily, the alarm 160 may send different alarm signals. For example, the buzzer may send buzzing sound signals of different frequencies. The buzzer may be controlled to send buzzing sound signals of different frequencies according to the gas concentration, for example, the higher the gas concentration, the higher the frequency of the buzzing sound signal.

[0065] In a specific embodiment, if the gas concentration is between the first threshold and the second threshold, the controller 140 may control the alarm 160 to send a low-frequency alarm signal. If the gas concentration gradually clears from above the first threshold, the controller 140 may still control the alarm 160 to send a low-frequency alarm signal, and control the alarm 160 to stop sending the alarm signal after a third fixed time. Optionally, the third fixed time may be 5-15 minutes, for example, 10 minutes. As mentioned above, the controller 140 also controls the motor 112b to start according to the gas concentration to discharge the leaked gas. The above-mentioned zeroing of the gas concentration may be caused by the action of the motor 112b, and in fact, the gas leakage is still occurring. Therefore, the alarm 160 may be controlled to continue to alarm for a period of time after the gas concentration gradually drops to 0, so as to obtain the user's intervention in the gas leakage. Optionally, after the gas concentration exceeds the first threshold, the alarm 160 is controlled to send a low-frequency alarm signal for a fourth fixed time, if the gas concentration is still not cleared, the controller 140 may control the alarm 160 to send a high-frequency alarm signal. The fourth fixed time may be any time length between 5 and 20 minutes, for example, 10 minutes. Optionally, when the controller 140 controls the motor 112b to stop running, if the gas concentration is reset to zero, it can be considered that this is due to the user's manual intervention that caused the gas concentration to be reset to zero, and at this time the alarm 160 can be controlled to stop sending an alarm signal. Optionally, after the gas concentration exceeds the first threshold, the gas concentration continues to increase and then exceeds the second threshold, and the alarm 160 is immediately controlled to send a higher frequency alarm signal. Taking the alarm 160 as a buzzer alarm as an example, a higher frequency alarm signal may be 2 rings per second, and a lower frequency alarm signal may be 1 ring per second.

[0066] The gas water heater 100 is provided with an alarm 160, and the controller 140 is also used to control the alarm 160 to send an alarm signal based on the gas concentration signal. Thus, the alarm 160 can be used to remind the user of gas leakage. This can be a useful supplement to the automatic exhaust of the motor 112b, and more effectively handle the gas leakage event.

[0067] Exemplarily, the gas water heater 100 further includes a display 170. The display 170 is electrically connected to the controller 140, and the controller 140 is further used to control the display 170 to display alarm information based on the gas concentration signal sent by the gas sensor 120. Specifically, the controller 140 can obtain the gas concentration according to the gas concentration signal, and if the gas concentration is greater than the first threshold, the display 170 is controlled to display the alarm information. The alarm information can be represented by special characters, for example, displayed as a fault code Err05.

[0068] Optionally, the display 170 can also be used to display information such as the working status, fault code, operation mode, safety warning, etc. of the gas water heater 100.

[0069] The gas water heater 100 is provided with a display 170 electrically connected to the controller 140. The controller 140 can control the display 170 to display alarm information according to the gas concentration signal to remind the user of the gas leakage problem, so that the user can handle it in time.

[0070] In the description of the present invention, it should be understood that the directions or positional relationships indicated by directional words such as "front", "back", "up", "down", "left", "right", "lateral", "vertical", "vertical", "horizontal", "top", "bottom", etc. are usually based on the directions or positional relationships shown in the drawings, and are only for the convenience of describing the present invention and simplifying the description. Unless otherwise specified, these directional words do not indicate or imply that the device or element referred to must have a specific direction or be constructed and operated in a specific direction, and therefore cannot be understood as limiting the scope of protection of the present invention; the directional words "inside" and "outside" refer to the inside and outside relative to the contours of each component itself.

[0071] For ease of description, regional relative terms such as "above", "above", "on the upper surface of", "above", etc. may be used here to describe the regional positional relationship between one or more components or features shown in the figure and other components or features. It should be understood that regional relative terms include not only the orientation of the components as described in the figure, but also different orientations in use or operation. For example, if the components in the accompanying drawings are inverted as a whole, the components "above other components or features" or "above other components or features" will include the situation where the components are "below other components or structures" or "below other components or structures". Therefore, the exemplary term "above" may include both "above" and "below". In addition, these components or features may also be positioned at other different angles (e.g., rotated 90 degrees or other angles), and this article is intended to include all of these situations.

[0072] 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 utility model. 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.

[0073] It should be noted that the terms "first", "second", etc. in the specification and claims of the present invention 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 invention described herein can be implemented in an order other than those illustrated or described herein.

[0074] The utility model has been described through 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 utility model to the scope of the described embodiments. In addition, it can be understood by those skilled in the art that the utility model is not limited to the above embodiments, and more variations and modifications can be made according to the teachings of the utility model, and these variations and modifications all fall within the scope of protection claimed by the utility model. The protection scope of the utility model is defined by the attached claims and their equivalents.

Claims

1. A gas water heater, characterized in that: include: Combustion gas path and gas sensor; among which, The combustion gas path is provided with a burner and a fan in sequence, and the exhaust port of the fan is connected to the gas outlet of the gas water heater; The gas sensor is arranged outside the combustion gas path, and is used to detect the gas concentration and generate a gas concentration signal; The fan comprises a motor, which is a brushless motor and is electrically connected to the gas sensor. The motor is configured to operate under the control of a gas concentration signal emitted by the gas sensor.

2. The gas water heater according to claim 1, characterized in that: The gas water heater further comprises a controller, wherein the controller is electrically connected to the gas sensor and the motor; The controller is used to control the motor to start or stop running based on the gas concentration signal sent by the gas sensor.

3. The gas water heater according to claim 2, characterized in that: The gas water heater also includes an input device, which is electrically connected to the controller. The controller is also used to determine that the operating state of the fan is normal based on an input instruction input using the input device, wherein the controller controls the start of the motor based on the gas concentration signal only when the operating state of the fan is normal.

4. The gas water heater according to claim 3, characterized in that: The input device includes a plurality of keys.

5. The gas water heater according to claim 2, characterized in that: A gas valve is also provided on the combustion gas path and upstream of the burner. The gas valve is electrically connected to the controller. The controller is also used to control the gas valve to close based on a gas concentration signal sent by the gas sensor.

6. The gas water heater according to claim 2, characterized in that: The gas water heater also includes an alarm; The alarm is electrically connected to the controller, and the controller is further used to control the alarm to send out an alarm signal based on the gas concentration signal sent out by the gas sensor.

7. The gas water heater according to claim 2, characterized in that: The gas water heater also includes a display; The display is electrically connected to the controller, and the controller is also used to control the display to display alarm information based on the gas concentration signal sent by the gas sensor.

8. The gas water heater according to claim 1, characterized in that: The gas water heater also includes a gas pipe; The air inlet of the air pipe faces the gas sensor, the air outlet of the air pipe faces the air inlet of the fan, and the air pipe is used to form a negative pressure at the gas sensor when the motor is running.

9. The gas water heater according to claim 1, characterized in that: The gas sensor is arranged at the upper middle part of the gas water heater.

10. The gas water heater according to claim 1, characterized in that: The gas water heater further comprises a shell, the gas sensor is arranged on the shell, and a ventilation hole is also arranged on the shell, and the distance between the ventilation hole and the gas sensor is less than a preset value.

Images