Constant temperature gas water heater and control method thereof

Abstract

The application discloses a constant-temperature gas water heater and a control method thereof, which comprises a fan, a burner, a water inlet pipeline and a water outlet pipeline, and further comprises an inner circulation pipeline, a one-way valve, a pump and a clutch, the inner circulation pipeline is connected with the water inlet pipeline and the water outlet pipeline, the one-way valve is arranged at the connection position of the inner circulation pipeline and the water inlet pipeline, the pump is connected with the inner circulation pipeline, and one end of the clutch is connected with a main shaft of the fan and the other end of the clutch is connected with the pump. After the hot water is turned off, the internal water flow continues to flow through the inner circulation pipeline, and the burner continues to work, so that when the hot water is turned on again, the sandwiched water does not appear. Meanwhile, the pump is connected with the main shaft of the fan through the clutch, so that the water flow in the inner circulation pipeline is driven to flow, the fan is fully utilized, and the normal operation of the inner circulation is ensured; in addition, the pump is arranged skillfully, a driving pump does not need to be additionally arranged on the pipeline, and the constant-temperature gas water heater is compact in structure and convenient to install.

Description

TECHNICAL FIELD

[0001] The present application relates to a constant temperature gas water heater and a control method thereof. BACKGROUND

[0002] At present, gas water heaters are widely used in families. During the use of hot water, users often turn off the faucet after using hot water for a period of time, at which time the water in the pipeline is heated hot water. However, when the user turns on the water again, the gas water heater needs to go through the processes of cleaning, ignition and fire transmission before heating the water to the temperature required by the user. However, during the process of starting the gas water heater, the water flow in the pipeline has already been flowing, which leads to a certain amount of cold water flowing out before the gas water heater starts heating. This phenomenon is called interlayer water. Macroscopically, after the user turns on the water again, there will be a certain amount of hot water, then cold water suddenly appears, and then it becomes hot water again, which leads to a poor user experience.

[0003] In the prior art, in order to solve the problem of interlayer water when the gas water heater starts again, an inner circulation pipeline is added to the gas water heater, and a driving device is additionally provided to drive the inner circulation, so that after the hot water is turned off, the inner circulation of the gas water heater starts to heat the remaining water, thereby ensuring that there is no interlayer water when it starts again.

[0004] However, such a structure needs to add a pump and a driving device to the pipeline of the gas water heater to ensure the operation of the pump, so as to start or stop the inner circulation. Such a way is not convenient to install, needs to replace the original pipeline, and needs to control the driving device separately, which may cause mutual interference between the inner circulation pipeline and the water inlet and outlet pipelines. SUMMARY

[0005] The technical problem to be solved by the present application is to overcome the defects in the prior art that the constant temperature gas water heater needs to add a pump and a driving device to the pipeline of the gas water heater, which leads to inconvenient installation, the need to control the driving device separately, and mutual interference between the pipelines. The present application provides a constant temperature gas water heater and a control method thereof.

[0006] The present application solves the above technical problems by the following technical solutions:

[0007] A constant temperature gas water heater, comprising a fan, a burner, a water inlet pipeline and a water outlet pipeline, characterized in that the constant temperature gas water heater further comprises:

[0008] an inner circulation pipeline, which connects the water inlet pipeline and the water outlet pipeline;

[0009] A one-way valve is arranged at the connection between the inner circulation pipeline and the water inlet pipeline, and is used to prevent water in the water inlet pipeline from flowing into the inner circulation pipeline;

[0010] A pump is connected to the inner circulation pipeline, and is used to drive water in the inner circulation pipeline to flow;

[0011] A clutch is connected at one end to the main shaft of the fan and at the other end to the pump, and is used to control the clutching of the main shaft of the fan and the pump.

[0012] In the present application, the above-mentioned structure is adopted, so that after the hot water is turned off, the internal water flow continues to flow through the inner circulation pipeline, thereby driving the burner to continue to work and heating the internal water flow to the set temperature, so that when the hot water is turned on again, the sandwiched water does not occur. Meanwhile, in the constant-temperature gas water heater, the pump is connected to the main shaft of the fan by the clutch, and the pump is driven to operate by the rotation of the main shaft of the fan, so that the water flow in the inner circulation pipeline is driven to flow, so that when the inner circulation is started, the fan not only provides oxygen for the burner, but also drives the pump to operate, so that the fan is fully utilized and the normal operation of the inner circulation is ensured. In addition, the pump is arranged ingeniously, and no pump needs to be additionally arranged on the pipeline, and no additional driving device, such as an additional motor, is needed to drive the pump to operate, so that no space in the gas water heater is occupied, and the structure of the constant-temperature gas water heater is further compact and easy to install.

[0013] In addition, when the constant-temperature gas water heater is controlled, the working state of the clutch only needs to be controlled, so that the pump is controlled and the inner circulation is controlled, and no additional control of the pump is needed. Meanwhile, the operating time of the pump is basically consistent with the operating time of the fan, and in the normal inner circulation state, the pump and the fan operate together, and after the inner circulation is turned off, the fan continues to rotate for a short time, and after the hot water in the inner circulation pipeline is completely discharged into the water inlet pipeline, the pump and the fan stop operating together, so that no mutual interference between the pump and the fan occurs, no excessive idling of the pump or the fan occurs, and no waste occurs.

[0014] Preferably, the clutch comprises a first rotating wheel, a second rotating wheel, a coil, an elastic member and a transmission shaft, one end of the transmission shaft is connected to the first rotating wheel, the other end of the transmission shaft is connected to the pump, one end of the second rotating wheel is connected to the main shaft of the fan, the other end of the second rotating wheel is opposite to the first rotating wheel, the first rotating wheel and the second rotating wheel are connectable, one end of the elastic member is connected to the first rotating wheel, the other end of the elastic member is connected to the transmission shaft, and the elastic member is used to pull the first rotating wheel to move away from the second rotating wheel, and the coil is used to drive the first rotating wheel to move close to the second rotating wheel.

[0015] In the present scheme, the first runner is axially moved by the coil and the elastic member, thereby achieving the clutching of the first runner and the second runner, and further achieving the clutching of the fan main shaft and the transmission shaft. The structure is compact, simple and effective, and the working process is efficient, stable and easy to control.

[0016] Preferably, the first runner is provided with a clamping groove arranged along the axial direction of the transmission shaft, the transmission shaft is provided with a connecting portion clamped in the clamping groove, the transmission shaft and the first runner are slidable relative to each other in the axial direction of the transmission shaft, and the transmission shaft and the first runner are locked relative to each other in the circumferential direction of the transmission shaft.

[0017] In the present scheme, the first runner can be moved forward and backward along the axial direction of the transmission shaft, thereby achieving the clutching of the first runner and the second runner, and further ensuring that the first runner and the transmission shaft are locked relative to each other in the circumferential direction of the transmission shaft without relative movement, so that the kinetic energy of the fan main shaft can be more stably transmitted to the transmission shaft when the first runner and the second runner are connected, thereby driving the rotation of the pump, effectively ensuring the normal operation of the internal circulation, and ensuring the stability and safety of the clutching member.

[0018] Preferably, the first runner is a cylindrical structure, one end of the first runner connected to the transmission shaft is provided with an opening, the transmission shaft is inserted into the first runner through the opening, one end of the transmission shaft inserted into the first runner is provided with a protruding portion abutting against the inner side of the first runner, so that an annular space is formed between the inside of the first runner and the protruding portion, the elastic member is installed in the annular space, and both ends of the elastic member are connected to the protruding portion and the first runner, respectively.

[0019] In the present scheme, the elastic member is independently arranged between the first runner and the transmission shaft, so that the elastic member is not affected by the coil, the second runner and other components, and the elastic member is better connected to the first runner and the transmission shaft, effectively improving the effect of the elastic member and its stability and safety.

[0020] Preferably, gears engageable between the first runner and the second runner are arranged, and the first runner and the second runner are connected to each other by the gears.

[0021] In the present scheme, the connection between the first runner and the second runner is more reliable and stable, and the stable operation of the clutching member is ensured.

[0022] Preferably, the constant temperature gas water heater comprises a main controller, and the coil is electrically connected to the main controller.

[0023] Preferably, the pump is a centrifugal pump and / or a peristaltic pump.

[0024] Preferably, the pump is a peristaltic pump, and the peristaltic pump comprises a plurality of rollers connected to the inner circulation pipeline for driving water flow.

[0025] Preferably, the inner circulation pipeline is bent in a U shape at the connection with the pump, and the plurality of rollers are connected to the inner side of the U-shaped section of the inner circulation pipeline.

[0026] Preferably, the constant temperature gas water heater comprises a water flow sensor and at least two temperature sensors, the temperature sensors are respectively arranged at the water inlet of the water inlet pipeline and the water outlet of the water outlet pipeline, and the water flow sensor is arranged on the water inlet pipeline for detecting the water flow of the water inlet or for detecting the water flow in the inner circulation pipeline.

[0027] Preferably, the constant temperature gas water heater comprises a main controller, and the water flow sensor and the temperature sensors are electrically connected to the main controller.

[0028] In the scheme, the above structure is adopted, so that the main controller can detect the water flow in the pipeline in real time, and control the operation of the burner, the fan and the clutch according to the water flow and the water temperature in the pipeline, so that the operation process of the constant temperature gas water heater is efficient, stable and safe.

[0029] The application also provides a control method of a constant temperature gas water heater, which uses the constant temperature gas water heater described above, and comprises the following steps:

[0030] Upon receiving a hot water use instruction, the burner and the fan are operated to heat the water in the pipeline;

[0031] Upon disappearance of the hot water use instruction, it is determined whether the water use duration is greater than a set duration and whether the water inlet temperature is less than a set temperature, and if so, the next step is performed;

[0032] The clutch connects the pump and the fan, and the pump and the fan are operated together, the water flow flows through the inner circulation pipeline, the water flow sensor detects a water flow signal, and the burner continues to operate;

[0033] It is determined whether the water inlet temperature is equal to the set temperature, and if so, the next step is performed;

[0034] The burner stops operating, the clutch disconnects the pump and the fan, and the pump and the fan continue to rotate by inertia until they stop.

[0035] In this solution, the above-mentioned structure allows the burner and fan in the constant temperature gas water heater to continue running after the user has finished using hot water, thereby driving the internal circulation operation and heating all the remaining water in the water inlet and outlet pipes of the water heater to the set temperature. This prevents the phenomenon of water layering when the user uses hot water again, effectively improving the user experience.

[0036] This invention also provides a control method for freeze protection of a constant temperature gas water heater. The control method utilizes the constant temperature gas water heater described above and includes the following steps:

[0037] When the constant temperature gas water heater is in standby mode, check whether the inlet water temperature is lower than the preset temperature or whether the outlet water temperature is lower than the preset temperature. If so, proceed to the next step.

[0038] The clutch connects the pump and the blower, and the blower and pump work together to determine whether the inlet water temperature is lower than the start temperature or whether the outlet water temperature is lower than the start temperature. If not, return to the previous step; if yes, proceed to the next step.

[0039] The water flow sensor detects the water flow signal, the burner is activated, the water in the pipe is heated, and it is determined whether the inlet water temperature is greater than the shut-off temperature or whether the outlet water temperature is greater than the shut-off temperature. If so, the next step is performed.

[0040] The burner stops working, the clutch disconnects the pump and fan, and the pump and fan continue to rotate due to inertia until they stop, and the constant temperature gas water heater enters standby mode.

[0041] In this solution, the above-mentioned structural form is adopted, which enables the constant temperature gas water heater to automatically circulate internally in environments with low external temperatures, thereby ensuring that its internal pipes will not freeze due to low temperatures, thus affecting its normal operation and effectively improving the safety of the constant temperature gas water heater.

[0042] The positive and progressive effects of this invention are as follows:

[0043] The constant temperature gas water heater is provided, so that after the water heater is closed, the internal water flow continues to flow through the internal circulation pipeline, so as to drive the burner to continue to work and heat the internal water flow to the set temperature, so that when the water heater is restarted, the sandwich water phenomenon does not occur. Meanwhile, in the constant temperature gas water heater, the existing fan is used, the pump is connected to the main shaft of the fan by the clutch, the pump is driven to run by the rotation of the main shaft of the fan, so that the water flow in the internal circulation pipeline is driven to flow, so that when the internal circulation is started, the fan not only provides oxygen for the burner, but also drives the pump to run, so that the fan is fully utilized and the normal operation of the internal circulation is ensured. In addition, the pump is arranged skillfully, and the pump does not need to be installed on the pipeline, so that the structure of the constant temperature gas water heater is compact and the installation is convenient. BRIEF DESCRIPTION OF DRAWINGS

[0044] Figure 1 It is a structure schematic view of the constant temperature gas water heater in the embodiment of the application.

[0045] Figure 2 It is a connection structure schematic view of the pump, the internal circulation pipeline and the fan in the embodiment of the application.

[0046] Figure 3 It is a sectional view of the clutch in the embodiment of the application.

[0047] Figure 4 It is a connection structure schematic view of the transmission shaft and the first runner in the embodiment of the application.

[0048] Figure 5 It is a structure schematic view of the first runner in the embodiment of the application.

[0049] Figure 6 It is a structure schematic view of the second runner in the embodiment of the application.

[0050] Figure 7 It is a flow chart of the control method of the constant temperature gas water heater in the embodiment of the application.

[0051] Figure 8 It is a flow chart of the control method of the anti-freezing protection of the constant temperature gas water heater in the embodiment of the application.

[0052] Explanation of reference signs:

[0053] Constant temperature gas water heater 1

[0054] Water inlet pipeline 11

[0055] Water inlet temperature sensor 111

[0056] Water flow sensor 112

[0057] Water outlet pipeline 12

[0058] Water outlet temperature sensor 121

[0059] Burner 13

[0060] Main controller 14

[0061] Internal circulation pipe 2

[0062] One-way valve 21

[0063] U-shaped section 22

[0064] Pump 3

[0065] Roller 31

[0066] Clutch 4

[0067] First Rotation Wheel 41

[0068] Card slot 411

[0069] Second Rotating Wheel 42

[0070] Coil 43

[0071] Elastic element 44

[0072] Drive shaft 45

[0073] Connecting part 451

[0074] Protrusion 452

[0075] Gear 46

[0076] Fan 5

[0077] 51 main shaft of the fan Detailed Implementation

[0078] The present invention will be further illustrated by way of embodiments below, but the present invention is not limited to the scope of the embodiments.

[0079] like Figures 1 to 5 As shown, this embodiment discloses a constant temperature gas water heater 1, which includes a fan 5, a burner 13, an inlet pipe 11, and an outlet pipe 12. The constant temperature gas water heater 1 also includes an internal circulation pipe 2, a one-way valve 21, a pump 3, and a clutch 4. The internal circulation pipe 2 connects the inlet pipe 11 and the outlet pipe 12. The one-way valve 21 is located at the connection between the internal circulation pipe 2 and the inlet pipe 11, and is used to prevent water in the inlet pipe 11 from flowing into the internal circulation pipe 2. The pump 3 is connected to the internal circulation pipe 2 and is used to drive the water in the internal circulation pipe 2 to flow. One end of the clutch 4 is connected to the main shaft of the fan 5, and the other end is connected to the pump 3, and is used to control the engagement and disengagement of the main shaft of the fan 5 and the pump 3.

[0080] In this embodiment, as Figure 1and Figure 2 As shown, by setting an internal circulation pipe 2 inside the gas water heater and connecting a pump 3 to the fan 5 via a clutch 4, the internal water flow continues through the internal circulation pipe 2 after the hot water is turned off, thereby driving the burner 13 to continue working and heating the internal water to the set temperature, ensuring that there is no water layering when the hot water is turned on again. Simultaneously, in this constant temperature gas water heater 1, the existing fan 5 is utilized, and the pump 3 is connected to the main shaft of the fan 5 via the clutch 4. The rotation of the fan main shaft 51 drives the pump 3, thereby driving the water flow in the internal circulation pipe 2. This ensures that when internal circulation is activated, the fan 5 not only provides oxygen to the burner 13 but also drives the pump 3, making full use of the fan 5 and ensuring the normal operation of internal circulation. Furthermore, the pump 3 is cleverly designed, eliminating the need to install it on the pipe or add an additional drive device, such as an extra motor, to drive its operation. Therefore, it does not occupy internal space of the gas water heater, further making the constant temperature gas water heater 1 compact and easy to install.

[0081] Furthermore, when controlling the constant temperature gas water heater 1, only the working state of the clutch 4 needs to be controlled to control the pump 3, thereby controlling the internal circulation, without the need for additional control of the pump 3. Simultaneously, the operating time of the pump 3 is basically the same as that of the fan 5. Under normal internal circulation conditions, the pump 3 and fan 5 operate together. After the internal circulation is closed, the fan 5 will continue to run for a short period until all the hot water in the internal circulation pipe 2 is discharged into the inlet pipe 11, at which point it will stop operating along with the pump 3. This prevents mutual interference between the pump 3 and the fan 5, avoids excessive idling of either pump 3 or fan 5, and prevents waste.

[0082] Specifically, such as Figure 3 As shown, the clutch 4 includes a first rotating wheel 41, a second rotating wheel 42, a coil 43, an elastic element 44, and a drive shaft 45. One end of the drive shaft 45 is connected to the first rotating wheel 41, and the other end is connected to the pump 3. One end of the second rotating wheel 42 is connected to the main shaft of the fan 5, and the other end is directly opposite the first rotating wheel 41. The first rotating wheel 41 and the second rotating wheel 42 can be connected in a cooperative manner. One end of the elastic element 44 is connected to the first rotating wheel 41, and the other end is connected to the drive shaft 45. It is used to pull the first rotating wheel 41 to move away from the second rotating wheel 42. The coil 43 is used to drive the first rotating wheel 41 to move closer to the second rotating wheel 42.

[0083] exist Figure 3In the embodiment, the first rotating wheel 41 and the second rotating wheel 42 are arranged to be connected together, the first rotating wheel 41 is connected to the transmission shaft 45, and the second rotating wheel 42 is connected to the fan main shaft 51. The coil 43 and the elastic member 44 are arranged on the first rotating wheel 41 and the transmission shaft 45. The first rotating wheel 41 can move axially through the coil 43 and the elastic member 44, so that the first rotating wheel 41 and the second rotating wheel 42 are connected or disconnected, and the fan main shaft 51 and the transmission shaft 45 are connected or disconnected. The structure is compact, simple and effective, and the working process is efficient, stable and easy to control.

[0084] In other embodiments, other clutch members 4 can also be used according to actual needs. For example, a solenoid valve is used. The on-off of the current of the electromagnet in the solenoid valve can control the piston, and then control the opening and closing of the mechanical device. Or a mechanical clutch member 4 is used. The clutch member 4 is triggered by manual operation or movement of a mechanical transmission mechanism. Therefore, the specific structure of the clutch member 4 is not limited to the range disclosed in the embodiment.

[0085] Specifically, as shown in Figure 4 and Figure 5 , the first rotating wheel 41 is provided with a clamping groove 411 arranged along the axial direction of the transmission shaft 45. The transmission shaft 45 is provided with a connecting part 451 clamped in the clamping groove 411. In the axial direction of the transmission shaft 45, the transmission shaft 45 and the first rotating wheel 41 can slide relative to each other. In the circumferential direction of the transmission shaft 45, the transmission shaft 45 and the first rotating wheel 41 are locked relative to each other.

[0086] As shown in Figure 5 , the first rotating wheel 41 is provided with a clamping groove 411. As shown in Figure 4 , the transmission shaft 45 is provided with a connecting part 451 corresponding to the clamping groove 411. The first rotating wheel 41 can move forward and backward along the axial direction of the transmission shaft 45, so that the first rotating wheel 41 and the second rotating wheel 42 are connected or disconnected. At the same time, the first rotating wheel 41 and the transmission shaft 45 are locked relative to each other in the circumferential direction of the transmission shaft 45, so that the first rotating wheel 41 and the second rotating wheel 42 are connected, and the kinetic energy of the fan main shaft 51 can be stably transmitted to the transmission shaft 45, thereby driving the rotation of the pump 3, so as to effectively ensure the normal operation of the internal circulation, and ensure the stability and safety of the clutch member 4.

[0087] Specifically, from Figure 5As can be seen, the first rotating wheel 41 is in a cylindrical structure, and an end of the first rotating wheel 41 connected with the transmission shaft 45 is provided with an opening, the transmission shaft 45 is inserted into the first rotating wheel 41 through the opening, and an end of the transmission shaft 45 inserted into the first rotating wheel 41 is provided with a protruding part 452 abutting on an inner side of the first rotating wheel 41, so that an annular space is formed between the inside of the first rotating wheel 41 and the protruding part 452, and the elastic member 44 is installed in the annular space and connected with the protruding part 452 and the first rotating wheel 41 at two ends thereof.

[0088] As shown in Figure 3 , at the connection between the first rotating wheel 41 and the transmission shaft 45, an annular space is formed, the elastic member 44 is arranged in the annular space and surrounds the transmission shaft 45, so that the elastic member 44 is independently arranged between the first rotating wheel 41 and the transmission shaft 45, which ensures that the elastic member 44 is not affected by the coil 43, the second rotating wheel 42 and other components, and at the same time, the elastic member 44 is better connected with the first rotating wheel 41 and the transmission shaft 45, which effectively improves the effect of the elastic member 44 and improves the stability and safety thereof.

[0089] Specifically, as shown in Figure 3 , Figure 5 and Figure 6 , the first rotating wheel 41 and the second rotating wheel 42 are provided with meshable gears 46, and the first rotating wheel 41 and the second rotating wheel 42 are connected with each other through the gears 46.

[0090] The gears 46 make the connection between the first rotating wheel 41 and the second rotating wheel 42 more reliable and higher in stability, which ensures the stable operation of the clutch member 4.

[0091] Specifically, the constant-temperature gas water heater 1 comprises a main controller 14, and the coil 43 is electrically connected with the main controller 14.

[0092] Specifically, as shown in Figure 2 and Figure 4 , the pump 3 is a peristaltic pump, and the peristaltic pump comprises a plurality of rollers 31 connected with the inner circulation pipeline 2 and used for driving the flow of water.

[0093] Specifically, the connection between the inner circulation pipeline 2 and the pump 3 is curved in a U shape, and the plurality of rollers 31 are connected with the inner side of the U-shaped section 22 of the inner circulation pipeline 2.

[0094] In other embodiments, other pumps 3 can also be used, such as centrifugal pumps, gear pumps, electromagnetic pumps and the like, and thus the specific structure of the pump 3 is not limited to the range disclosed in the embodiment.

[0095] Specifically, the constant temperature gas water heater 1 comprises a water flow sensor 112 and two temperature sensors, which are respectively arranged at the water inlet of the water inlet pipeline 11 and the water outlet of the water outlet pipeline 12 as a water inlet temperature sensor 111 and a water outlet temperature sensor 121, and the water flow sensor 112 is arranged on the water inlet pipeline 11 and used for detecting the water flow of the water inlet or the water flow flowing in the inner circulation pipeline 2.

[0096] Specifically, the constant temperature gas water heater 1 comprises a main controller 14, and the water flow sensor 112 and the temperature sensor are electrically connected to the main controller 14.

[0097] In the embodiment, the main controller 14 is electrically connected to the water flow sensor 112, the temperature sensor, the coil 43 and the like, so that the main controller 14 can detect the water flow condition in the pipeline in real time, and control the operation of the burner 13, the fan 5 and the clutch 4 according to the water flow and the water flow temperature in the pipeline, so that the operation process of the constant temperature gas water heater 1 is efficient, stable and safe.

[0098] As shown in Figure 7 The application further provides a control method of the constant temperature gas water heater 1, the control method of the constant temperature gas water heater 1 uses the constant temperature gas water heater 1, and the control method of the constant temperature gas water heater 1 comprises the following steps:

[0099] After receiving the hot water using instruction, the burner 13 and the fan 5 operate to heat the water in the pipeline, as shown in Figure 7 A specific implementation step is step 101: the user uses hot water, and the water heater starts heating.

[0100] The hot water using instruction disappears, as shown in Figure 7 A specific implementation step is step 102: the user turns off the hot water, the water heater stops heating, and it is judged whether the water using time is greater than the starting time and whether the water inlet temperature is less than the starting temperature, if yes, the next step is performed, as shown in Figure 7 A specific implementation step is step 103: if the water using time is greater than or equal to 30s and the water inlet temperature is less than or equal to 30 DEG C, the next step is performed.

[0101] The clutch 4 connects the pump 3 and the fan 5, and the pump 3 and the fan 5 jointly operate, and the water flow flows through the inner circulation pipeline 2, in this step, specifically, the clutch 4 is energized to make the first rotating wheel 41 and the second rotating wheel 42 interlock, as shown in Figure 7 A specific implementation step is step 104: the electromagnetic clutch is energized, and the fan 5 and the peristaltic pump operate; at this time, the water flow sensor 112 detects the water flow signal, and the burner 13 continues to operate, as shown in Figure 7As shown, a specific implementation step is step 105: monitoring the water flow signal, and the water heater is ignited for heating;

[0102] It is determined whether the inlet water temperature is equal to the set temperature, and if so, the next step is performed, for example, Figure 7 As shown, a specific implementation step is step 106: if the inlet water temperature is equal to the set temperature, the next step is performed, and if the inlet water temperature is not equal to the set temperature, the water heater continues to heat;

[0103] The burner 13 stops running, the clutch 4 disconnects the pump 3 from the fan 5, and the pump 3 and the fan 5 continue to rotate by inertia until they stop, for example, Figure 7 As shown, a specific implementation step is steps 107 to 109, step 107: the water heater stops heating, and the peristaltic pump continues to run for 10s; step 108: the fan 5 motor is turned off, and the electromagnetic clutch is powered off; and step 109: waiting for the user to use hot water again.

[0104] Through the above control method, after the user uses the hot water, the burner 13 and the fan 5 in the constant temperature gas water heater 1 continue to run, thereby driving the internal circulation to heat all the remaining water in the inlet water pipe 11 and the outlet water pipe 12 of the water heater to the set temperature, so that the user does not have the phenomenon of interlayer water when using hot water again, effectively improving the user experience.

[0105] In this embodiment, the enablement duration in step 103 is 30 seconds, and the enablement temperature is 30 degrees Celsius. In actual application, the user can change it according to his own use needs and habits.

[0106] As shown, Figure 8 The application also provides a control method for anti-freezing protection of a constant temperature gas water heater 1, which uses the constant temperature gas water heater 1 described above, and includes the following steps:

[0107] The constant temperature gas water heater 1 is in a standby state, for example, Figure 8 As shown, a specific implementation step is step 201: the water heater is in a standby state (anti-freezing protection is turned on); it is determined whether the inlet water temperature is less than a preliminary temperature, or whether the outlet water temperature is less than a preliminary temperature, and if so, the next step is performed, for example, Figure 8 As shown, a specific implementation step is step 202: if the inlet water temperature or the outlet water temperature is less than or equal to 5 degrees Celsius, the next step is performed;

[0108] The clutch 4 connects the pump 3 and the fan 5, and the fan 5 and the pump 3 operate together, for example, Figure 8As shown, a specific implementation step is step 203: the electromagnetic clutch is powered on, the fan 5 and the peristaltic pump are running; and it is determined whether the inlet water temperature is less than the start temperature, or the outlet water temperature is less than the start temperature, if not, return to the previous step, if yes, proceed to the next step, such as Figure 8 As shown, a specific implementation step is step 204 and 205, step 204: continue to monitor the inlet and outlet water temperature; step 205: if the inlet water temperature or the outlet water temperature is less than or equal to 2 degrees Celsius, proceed to the next step;

[0109] The water flow sensor 112 detects the water flow signal, the burner 13 is started, and the water flow in the pipeline is heated, such as Figure 8 As shown, a specific implementation step is step 206: the water flow sensor detects the water flow signal, and the water heater is ignited for heating; and it is determined whether the inlet water temperature is greater than the shutdown temperature, or the outlet water temperature is greater than the shutdown temperature, if yes, proceed to the next step, such as Figure 8 As shown, a specific implementation step is step 207: if the inlet water temperature or the set temperature is greater than or equal to 25 degrees Celsius, proceed to the next step, if not, the water heater continues to heat;

[0110] The burner 13 stops working, the clutch 4 disconnects the pump 3 and the fan 5, the pump 3 and the fan 5 continue to rotate until they stop relying on inertia, and the constant temperature gas water heater 1 enters the standby state, such as Figure 8 As shown, a specific implementation step is step 208 and 209, step 208: the water heater stops heating; step 209: the fan 5 motor is turned off, and the electromagnetic clutch is powered off.

[0111] Through the above control method, in the environment with lower external temperature, the constant temperature gas water heater 1 can autonomously perform internal circulation, so that the internal pipeline of the constant temperature gas water heater 1 will not freeze due to too low temperature, thereby affecting the normal operation, and the safety of the constant temperature gas water heater 1 is effectively improved.

[0112] In this embodiment, the standby temperature is set to 5 degrees Celsius, the start temperature is 2 degrees Celsius, and the shutdown temperature is 25 degrees Celsius. In actual application, the user can modify it according to the specific environment.

[0113] Although the specific embodiments of the present application are described above, those skilled in the art should understand that this is only an example, and the protection scope of the present application is defined by the appended claims. Those skilled in the art can make various changes or modifications to these embodiments without departing from the principles and essence of the present application, and such changes and modifications fall within the protection scope of the present application.

Claims

1. A constant temperature gas water heater comprising a fan, a burner, a water inlet pipe and a water outlet pipe, characterized in that, The constant-temperature gas water heater further comprises: an inner circulation pipeline connecting the water inlet pipeline and the water outlet pipeline; a one-way valve arranged at the connection between the inner circulation pipeline and the water inlet pipeline, which prevents water in the water inlet pipeline from flowing into the inner circulation pipeline; a pump connected to the inner circulation pipeline for driving water in the inner circulation pipeline to flow; a clutch having one end connected to the main shaft of the fan and the other end connected to the pump for controlling the clutch between the main shaft of the fan and the pump; the clutch comprises a first rotating wheel, a second rotating wheel, a coil, an elastic member and a transmission shaft, one end of the transmission shaft is connected to the first rotating wheel, the other end is connected to the pump, one end of the second rotating wheel is connected to the main shaft of the fan, the other end is opposite to the first rotating wheel, the first rotating wheel and the second rotating wheel are connectable, one end of the elastic member is connected to the first rotating wheel, the other end is connected to the transmission shaft, for pulling the first rotating wheel to move away from the second rotating wheel, and the coil is used to drive the first rotating wheel to move towards the second rotating wheel.

2. The thermostatic gas water heater as claimed in claim 1, wherein, The first rotating wheel is provided with a clamping groove arranged along the axial direction of the transmission shaft, the transmission shaft is provided with a connecting portion clamped in the clamping groove, and the transmission shaft and the first rotating wheel are slidable relative to each other in the axial direction of the transmission shaft and are locked relative to each other in the circumferential direction of the transmission shaft.

3. The thermostatic gas water heater of claim 1, wherein The first rotating wheel is in a cylindrical structure, one end of the first rotating wheel connected to the transmission shaft is provided with an opening, the transmission shaft is inserted into the first rotating wheel through the opening, one end of the transmission shaft inserted into the first rotating wheel is provided with a protruding portion abutting against the inner side surface of the first rotating wheel, so that an annular space is formed between the inside of the first rotating wheel and the protruding portion, the elastic member is installed in the annular space, and two ends of the elastic member are connected to the protruding portion and the first rotating wheel respectively.

4. The thermostatic gas water heater of claim 1, wherein Gear wheels engageable between the first rotating wheel and the second rotating wheel are arranged, and the first rotating wheel and the second rotating wheel are connectable through the gear wheels.

5. The thermostatic gas water heater of claim 1 wherein, The constant-temperature gas water heater comprises a main controller, and the coil is electrically connected to the main controller.

6. The thermostatic gas water heater of claim 1, wherein The pump is a centrifugal pump and / or a peristaltic pump.

7. The thermostatic gas water heater of claim 6 wherein, The pump is a peristaltic pump, which comprises a plurality of rollers connected to the inner circulation pipeline for driving water flow.

8. The thermostatic gas water heater of claim 7, wherein the temperature sensor is a thermistor. The connection between the inner circulation pipeline and the pump is bent in a U shape, and the plurality of rollers are connected to the inner side of the U-shaped section of the inner circulation pipeline.

9. The thermostatic gas water heater of claim 1 wherein, The constant-temperature gas water heater comprises a water flow sensor and at least two temperature sensors, the temperature sensors are arranged at the water inlet of the water inlet pipeline and the water outlet of the water outlet pipeline respectively, the water flow sensor is arranged on the water inlet pipeline for detecting the water flow of the water inlet, or for detecting the water flow out of the inner circulation pipeline.

10. The thermostatic gas water heater of claim 9, wherein, The constant-temperature gas water heater comprises a main controller, and the water flow sensor and the temperature sensor are electrically connected to the main controller.

11. A control method of a constant temperature gas water heater, characterized by, The control method of the constant-temperature gas water heater comprises the constant-temperature gas water heater according to any one of claims 1-10, and the control method comprises the following steps: Upon receiving a hot water use instruction, the burner and the fan are operated to heat the water in the pipeline; Upon disappearance of the hot water use instruction, it is determined whether the water use duration is greater than a set duration and whether the water inlet temperature is less than a set temperature, and if so, the next step is performed; The clutch connects the pump and the fan, and the pump and the fan are operated together, the water flow passes through the inner circulation pipeline, the water flow sensor detects a water flow signal, and the burner continues to operate; It is determined whether the water inlet temperature is equal to the set temperature, and if so, the next step is performed; The burner stops operating, the clutch disconnects the pump and the fan, and the pump and the fan continue to rotate by inertia until stopping.

12. A control method for freeze protection of a constant temperature gas water heater, the method comprising: The control method of the constant-temperature gas water heater for anti-freezing protection comprises the constant-temperature gas water heater according to any one of claims 1-10, and the control method comprises the following steps: Upon receiving a hot water use instruction, the burner and the fan are operated to heat the water in the pipeline; Upon disappearance of the hot water use instruction, it is determined whether the water use duration is greater than a set duration and whether the water inlet temperature is less than a set temperature, and if so, the next step is performed; The clutch connects the pump and the fan, and the pump and the fan are operated together, the water flow passes through the inner circulation pipeline, the water flow sensor detects a water flow signal, and the burner continues to operate; It is determined whether the water inlet temperature is equal to the set temperature, and if so, the next step is performed; The burner stops operating, the clutch disconnects the pump and the fan, and the pump and the fan continue to rotate by inertia until stopping.

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