Instant heating faucet

Abstract

The instant heating faucet comprises a water inlet pipe and a heating device, the water inlet pipe is provided with a flow adjusting valve, the flow adjusting valve comprises a valve rod, the valve rod is provided with a triggering piece, the triggering piece rotates along with the valve rod, and the rotating track of the triggering piece comprises the starting position, the middle position and the ending position. The trigger piece rotates between a starting position and a stopping position, a microswitch is arranged between the middle position and the stopping position, the microswitch is close to the middle position, and the microswitch is arranged on a wiring circuit of the heating device. The trigger piece rotates back and forth between the starting position and the ending position, the microswitch is arranged between the middle position and the ending position, the trigger piece starts to rotate from the starting position, cold water flows out of the instant heating faucet firstly, and then hot water flows out of the instant heating faucet after the microswitch is triggered, so that the situation that hot water flows out directly is avoided, and a user is not prone to being scalded; and the use safety of the instant heating faucet is greatly improved.

Description

Technical Field

[0001] This application relates to the technical field of faucets, and particularly to an instant hot faucet with high safety. Background Art

[0002] An instant hot faucet, also known as an electric hot faucet, refers to a faucet that can produce hot water within 3s - 5s after being turned on. In recent years, due to the advantages of instant hot faucets, such as being able to produce both hot and cold water, easy installation, and simple operation, they have been widely used. The switches of existing instant hot faucets are generally two-way operated, that is, the closed position of the switch is set in the middle, and the switch can be rotated up and down or left and right. The two sides of the closed position of the switch respectively correspond to cold water and hot water. Users are prone to operating errors. When cold water is needed, it is very easy to turn the switch to the area corresponding to hot water, and the instant hot faucet will directly produce hot water, scalding the user. Moreover, in the two-way operation water outlet mode, when the switch rotates from the middle closed position to both sides to discharge water (hot water or cold water), the larger the rotation angle, the corresponding increase in the water flow rate of the machine, and vice versa, the smaller the flow rate until it is closed at the middle position. The heating principle of an electric hot faucet is that when the power is constant, the larger the flow rate, the lower the temperature, and the smaller the flow rate, the higher the temperature. Therefore, when closing the valve core after using hot water, the flow rate decreases, and the water temperature in the heating device becomes higher (although the action of closing the valve core is relatively fast during normal use, the increase in the water temperature in the heating device caused by this action is not obvious). However, due to the thermal inertia (residual temperature) of traditional heating elements, after the valve core is closed, the residual hot water that cannot be discharged in the heating device will further increase in temperature due to the thermal inertia (residual temperature) of the heating element. This will cause the water temperature in the heating device to be higher than the temperature at the end of the previous use when the user uses hot water again within a short period of time after using hot water last time. It is also possible that the hot water in the first few seconds of water discharge will be scalding hot, scalding the user, and the safety performance needs to be improved. Summary of the Invention

[0003] In order to solve the above-mentioned drawbacks and deficiencies in the prior art, the purpose of this application is to provide an instant hot faucet with high safety, effectively improving the safety during the use of the instant hot faucet.

[0004] To achieve the above object, an instant hot water faucet of the present application includes a water inlet pipe, a heating device, and a water outlet faucet that are connected in sequence. A flow regulating valve is provided on the water inlet pipe. The flow regulating valve is used to regulate the water flow rate flowing from the water inlet pipe to the heating device. The flow regulating valve includes a valve stem, and a trigger is provided on the valve stem. The trigger rotates together with the valve stem. The rotation trajectory of the trigger includes a starting position, an intermediate position, and a terminating position. The trigger rotates between the starting position and the terminating position. A microswitch is provided between the intermediate position and the terminating position. The microswitch is adjacent to the intermediate position. The microswitch is provided on the power connection line of the heating device.

[0005] Further, when the trigger is in the starting position, one end of the trigger is in the starting position, and the other end of the trigger is between the starting position and the intermediate position. When the trigger is in the terminating position, the end of the trigger far from the starting position is in the terminating position.

[0006] Further, the arc length of the trigger is greater than or equal to the arc length from the intermediate position to the terminating position, and the arc length of the trigger is less than the arc length from the starting position to the intermediate position.

[0007] Further, when the trigger rotates from the starting position to the intermediate position, the water flow rate flowing from the water inlet pipe to the heating device gradually increases. When the trigger rotates from the intermediate position to the terminating position, the water flow rate flowing from the water inlet pipe to the heating device gradually decreases.

[0008] Further, when the trigger rotates from the terminating position to the intermediate position, the water flow rate flowing from the water inlet pipe to the heating device gradually increases. When the trigger rotates from the intermediate position to the starting position, the water flow rate flowing from the water inlet pipe to the heating device gradually decreases.

[0009] Further, it further includes a Hall switch and a rotor. The rotor is provided in the water inlet pipe. The Hall switch is provided on the power connection line of the heating device. The Hall switch is connected in series with the microswitch. The Hall switch is turned on when it senses the rotation of the rotor.

[0010] Further, a control board electrically connected to it is provided on the outer periphery of the heating device. The control board is electrically connected to the microswitch.

[0011] Further, a first temperature controller for detecting the surface temperature of the heating device and turning on or off according to its surface temperature is provided on the heating device. The first temperature controller is connected in series with the microswitch.

[0012] Further, a second temperature controller for detecting the surface temperature of the heating device and turning on or off according to the surface temperature is provided on the heating device. The second temperature controller is connected in series with the first temperature controller, and the upper limit temperature of the second temperature controller is higher than that of the first temperature controller.

[0013] Further, a protection device is provided outside the heating device, and the control board is arranged on the outer periphery of the protection device.

[0014] Compared with the prior art, the present invention has the following beneficial technical effects: 1. The valve rod drives the trigger to rotate back and forth between the starting position and the ending position, and the micro switch is arranged between the middle position and the ending position. The trigger starts to rotate from the starting position, that is, the instant hot water faucet first discharges cold water. After triggering the micro switch, that is, the instant hot water faucet then discharges hot water, and the situation of directly discharging hot water will not occur, so that the user is not easily scalded, greatly improving the use safety of the instant hot water faucet. And in this kind of water discharge mode, whether it is the opening (off → cold water → hot water) or closing (hot water → cold water → off) action, before and after the heating action of the heating device, cold water will pass through, which makes the residual hot water in the heating device be discharged to varying degrees, enabling the heating element to cool down rapidly, thereby reducing the influence of the residual temperature and the thermal inertia of the heating element on the user, and the user is not easily scalded, greatly improving the use safety of the instant hot water faucet. Description of the Drawings

[0015] Figure 1 is a schematic structural diagram of an instant hot water faucet according to an embodiment of the present application; Figure 2 is Figure 1 the explosion diagram in Figure 3 is Figure 2 the structural schematic diagram of another angle of Figure 4 is Figure 2 the explosion diagram between the protective sleeve, the cast aluminum heating element and the water inlet pipe in Figure 5 is Figure 2 the assembly diagram of the flow regulating valve and the water inlet pipe in Figure 6 is Figure 5 the explosion diagram of Figure 7 is Figure 5 the structural schematic diagram of the valve rod and the trigger in Figure 8 is a schematic diagram of the rotation trajectory of the trigger block in an embodiment of the present application; Figure 9 is a control schematic diagram of the cast aluminum heating element in an embodiment of the present application; Figure 10This is the control schematic diagram of the cast aluminum heating element in an embodiment of the present application; Figure 11 This is the control schematic diagram of the cast aluminum heating element in an embodiment of the present application. Detailed implementation manners

[0016] Here, the exemplary embodiments will be described in detail, and the examples are shown in the accompanying drawings. When the following description refers to the accompanying drawings, unless otherwise indicated, the same numbers in different drawings represent the same or similar elements. The implementation manners described in the following exemplary embodiments do not represent all implementation manners consistent with the present application. On the contrary, they are only examples of the devices consistent with some aspects of the present application as detailed in the appended claims.

[0017] The terms used in the present application are only for the purpose of describing specific embodiments and are not intended to limit the present application. Unless otherwise defined, the technical terms or scientific terms used in the present application should be of the ordinary meaning understood by those of ordinary skill in the art to which the present invention belongs. The terms "a" or "an" and the like used in the specification and claims of the present application do not indicate a limitation of quantity either, but mean that there is at least one. The terms "comprising" or "including" and the like mean that the elements or items appearing before "comprising" or "including" cover the elements or items listed after "comprising" or "including" and their equivalents, and do not exclude other elements or items. The terms "connected" or "coupled" and the like are not limited to physical or mechanical connections, and may include electrical connections, whether direct or indirect. The singular forms "a", "the" and "said" used in the specification and appended claims of the present application are also intended to include the plural forms unless the context clearly indicates otherwise. It should also be understood that the term "and / or" used herein refers to and includes any or all possible combinations of one or more of the associated listed items.

[0018] Please refer to Figures 1 - 11 As shown, an instant hot water faucet includes a water inlet pipe 1, a heating device, and a water outlet faucet 2 that are connected in sequence. A flow regulating valve is provided on the water inlet pipe 1, and the flow regulating valve is used to regulate the water flow rate flowing from the water inlet pipe 1 to the heating device.

[0019] Among them, the flow regulating valve includes a valve core, a valve stem 3, and a handle 4. The valve core is disposed inside the water inlet pipe 1 and not shown, and it is used to regulate the magnitude of the water flow rate. The valve stem 3 is in driving connection with the valve core, and the handle 4 is sleeved on the end of the valve stem 3 away from the valve core and rotates together with the valve stem 3. The rotation of the valve core to regulate the water flow rate is the same as the prior art and will not be elaborated herein.

[0020] A connection disk 5 is provided on the valve stem 3, and a trigger member 6 protrudes from the outer periphery of the connection disk 5. The trigger member 6 rotates together with the valve stem 3. In this embodiment, please refer toFigure 8 As shown, the trigger 6 is arc-shaped, and the rotation trajectory 7 of the trigger 6 is also arc-shaped. The rotation trajectory 7 includes a starting position 8, an intermediate position 9, and a termination position 10. The trigger 6 rotates between the starting position 8 and the termination position 10. A microswitch 11 is provided between the intermediate position 9 and the termination position 10. The microswitch 11 is close to the intermediate position 9, and the microswitch 11 is provided on the power connection line of the heating device.

[0021] When the trigger 6 is at the starting position 8, one end of the trigger 6 is at the starting position 8, and the other end of the trigger 6 is between the starting position 8 and the intermediate position 9. When the trigger 6 rotates to the intermediate position 9, the end of the trigger 6 far from the starting position 8 contacts the microswitch 11. When the trigger 6 continues to rotate towards the termination position 10, the microswitch 11 is triggered, and the heating device starts to heat and work. When the trigger 6 rotates to the termination position 10, the end of the trigger 6 far from the starting position 8 is at the termination position 10.

[0022] The valve stem 3 drives the trigger 6 to rotate back and forth between the starting position 8 and the termination position 10, and the microswitch 11 is provided between the intermediate position 9 and the termination position 10. The trigger 6 starts to rotate from the starting position 8, that is, the instant hot water faucet first discharges cold water. After the microswitch 11 is triggered, the instant hot water faucet then discharges hot water, without the user having to select cold water or hot water, and there will be no situation of directly discharging hot water. It is not easy for the user to be scalded, greatly improving the use safety of the instant hot water faucet. And in this kind of water discharge mode, whether it is the opening (off → cold water → hot water) or closing (hot water → cold water → off) action, the heating device will pass through cold water before and after the heating action starts and ends. This enables the residual hot water in the heating device to be discharged to varying degrees, allowing the heating element in the heating device to cool down quickly, thereby reducing the influence of the residual temperature and the thermal inertia of the heating device on the user and further improving the use safety.

[0023] In order to better trigger the microswitch 11, a guiding inclined surface 28 is provided at the end of the trigger 6 far from the starting position 8. The arc length of the guiding inclined surface 28 from the starting position 8 gradually decreases from top to bottom. When the trigger 6 contacts the microswitch 11, under the action of the guiding inclined surface 28, the microswitch 11 is pressed downward to be triggered. When the trigger 11 continues to rotate towards the termination position 10, the microswitch 11 is always pressed by the trigger 6 and is triggered.

[0024] In order to limit the rotation of the trigger member 6, a limit block 12 and a limit member are provided on the rotation trajectory 7 of the trigger member 6. The limit block 12 is close to the end position 10, and the limit member is close to the starting position 8. When the trigger member 6 rotates to the end position 10, the trigger member 6 abuts against the limit block 12. When the trigger member 6 rotates to the starting position 8, the trigger member 6 abuts against the limit member. Of course, the limit block 12 and the limit member do not have to be set on the rotation trajectory of the trigger member 6, and can also be set on the rotation trajectory of the handle 4 and / or the valve stem 3. In this embodiment, the limit member is not shown in the figure.

[0025] In this embodiment, a mounting seat 25 is provided on the water inlet pipe 1, the micro switch 11 and the limit block 12 are fixedly mounted on the mounting seat 25, and the valve core is arranged in the water inlet pipe 1 corresponding to the mounting seat 25, the valve stem 3 is passed through the mounting seat 25, and the handle 4 is arranged above the mounting seat 25.

[0026] Among them, the arc length of the trigger member 6 is greater than or equal to the arc length from the middle position 9 to the end position 10, and the arc length of the trigger member 6 is less than the arc length from the starting position 8 to the middle position 9. Such a setting can ensure that cold water comes out first and then hot water after the handle 4 is rotated, and when between the middle position 9 and the end position 10, the heating device is always in a heating state.

[0027] In this embodiment, when the trigger member 6 is turned from the starting position 8 to the middle position 9, the water flow rate of the water inlet pipe 1 to the heating device gradually increases, and the heating device does not work. When the trigger member 6 is turned from the middle position 9 to the end position 10, the water flow rate of the water inlet pipe 1 to the heating device gradually decreases, and the micro switch 11 is triggered by the trigger member 6, and the heating device starts to work. When the heating power of the heating device is constant, during the process of the trigger member 6 turning from the middle position 9 to the end position 10, the water outlet faucet 2 discharges hot water, and the temperature of the hot water gradually increases. Of course, the heating power of the heating device can also adopt adjustable power, and the heating power can be adjusted according to the water flow rate. For example, reducing the water flow rate reduces the heating power, and increasing the water flow rate provides heating power, so that the water outlet faucet 2 discharges hot water. The hot water temperature is constant within a certain range, and vice versa, when the trigger member 6 is rotated from the end position 10 to the middle position 9, the water flow rate of the water inlet pipe 1 to the heating device gradually increases, and the water outlet temperature of the water outlet faucet 2 gradually decreases or remains constant within a certain range. When the trigger member 6 is rotated from the middle position 9 to the starting position 8, the water flow rate of the water inlet pipe 1 to the heating device gradually decreases, and the water outlet faucet 2 discharges cold water. Regardless of whether the heating power of the heating device is constant or variable, the trigger member 6 is rotated from the end position 10 to the middle position 9. At this time, the amount of cold water passing through the heating device is the largest, which can effectively take away the excess heat in the heating device, reduce the impact of the thermal inertia of the heating device on the user, and extend the service life of the heating device.

[0028] When the trigger 6 is in the starting position 8, the water faucet 2 does not discharge water. When the trigger 6 rotates from the starting position 8 to the intermediate position 9, the water faucet 2 discharges cold water. When the trigger 6 rotates from the intermediate position 9 to the ending position 10, the water faucet 2 discharges hot water. When the trigger 6 rotates from the ending position 10 to the intermediate position 9, the water faucet 2 also discharges hot water. When the trigger 6 rotates from the intermediate position 9 towards the starting position 8, the water faucet 2 discharges cold water. When the trigger 6 rotates back to the starting position 8, the water faucet 2 does not discharge water.

[0029] In one embodiment, a rotor (not shown in the figure) is provided in the water inlet pipe 1. A Hall switch 13 is provided on the power connection line of the heating device. The Hall switch 13 is connected in series with the microswitch 11. The Hall switch 13 conducts when it senses the rotation of the rotor, that is, when there is water flow in the water inlet pipe 1, and combined with the opening of the microswitch 11, the heating device will work, avoiding the situation of dry burning due to lack of water in the water inlet pipe 1 and the heating device. The working principle of the Hall switch 13 conducting when it senses the rotation of the rotor is the same as the prior art and will not be elaborated here.

[0030] In this embodiment, the water inlet pipe 1 includes a first section 14 and a second section 15 that are connected and communicate with each other. The first section 14 extends upward from the bottom, and the second section 15 is arranged horizontally and communicates with the heating device. The rotor can be arranged in the first section 14 and / or the second section 15. Of course, one rotor can be provided, please refer to Figure 9 、 10 as shown, or multiple rotors can be provided, please refer to Figure 11 as shown. When there are multiple rotors, there are also multiple Hall switches 13. The Hall switches 13 correspond to the rotors one by one, and the multiple Hall switches 13 are connected in series.

[0031] The heating device is provided with a water inlet end 16 and a water outlet end 17. The water inlet section 16 communicates with the water inlet pipe 1, and the water outlet end 17 is directly connected to the water faucet 2. A temperature sensor 18 for real-time monitoring of the outlet water temperature is provided at the water outlet end 17. The temperature sensor 18 is electrically connected to the control board 19, and the control board 19 is electrically connected to the heating device. By setting the temperature sensor 18 at the water outlet end 17, the outlet water temperature of the heating device and the water faucet can be accurately displayed, reducing the difference between the outlet water temperature of the water faucet and the outlet water temperature of the heating device. Of course, the control board 19 can also control the operation of the heating device through the temperature sensor 18. When the outlet water temperature monitored by the temperature sensor 18 is lower than the set temperature, the control board 19 makes the heating device continue to heat. When the outlet water temperature monitored by the temperature sensor 18 is equal to or slightly higher than the set temperature, the control board 19 makes the heating device stop heating, so that the outlet water temperature of the heating device is kept constant within the set temperature range. In this embodiment, the control board 19 is electrically connected to the display 20, and the display 20 timely displays the detected temperature of the temperature sensor 18, which is beneficial for the user to intuitively know the outlet water temperature and can effectively prevent the user from being scalded.

[0032] The heating device includes a water storage chamber, and a heating element is arranged in the water storage chamber to heat the water flow in the water storage chamber. Of course, the heating device can also be in other forms. In this embodiment, the heating device is preferably a cast aluminum heating element 21.

[0033] When the trigger 6 rotates from the starting position 8 to the intermediate position 9, cold water flows out of the water outlet faucet 2. The display 20 can display or not display the cold water temperature at this time. When the trigger 6 triggers the microswitch 11, the display 20 displays the water outlet temperature. When switching between cold water supply and hot water supply, the user can be reminded by changes in sound, changes in color, a combination of sound and color changes, and other prompting methods, so that the user can timely understand the working state of the instant hot water faucet.

[0034] A protection device is sleeved on the surface of the cast aluminum heating element 21. The protection device is preferably a protective sleeve 22 made of insulating, high-temperature resistant and heat-insulating material. The display 20 and the control board 19 are arranged outside the protective sleeve 22, so that the cast aluminum heating element 21 is isolated from electronic components such as the display 20 and the control board 19, playing a role in preventing scalding and protecting electronic components, capable of extending the service life of electronic components, and thus extending the service life of the instant hot water faucet. And it can play an insulating role, isolating the electric leakage caused by the long-term operation of the cast aluminum heating element 21 resulting in damage, thereby improving safety.

[0035] In one embodiment, please refer to Figure 3 、 10 As shown, a first temperature controller 23 is arranged on the cast aluminum heating element 21. The first temperature controller 23 is used to detect the surface temperature of the cast aluminum heating element 21 and turn on or off according to its surface temperature. The first temperature controller 23 is electrically connected to the control board 19. When the surface temperature of the cast aluminum heating element 21 detected by the first temperature controller 23 is greater than its upper limit temperature, the first temperature controller 23 disconnects, so that the control board 19 controls the cast aluminum heating element 21 to stop heating, effectively controlling the temperature of the cast aluminum heating element 21 and improving the use safety.

[0036] The first temperature controller 23 adopts an automatic reset temperature controller, that is, when the surface temperature of the cast aluminum heating element 21 detected by the first temperature controller 23 is lower than its upper limit temperature, the first temperature controller 23 resets and works, so that the control board 19 controls the cast aluminum heating element 21 to continue heating.

[0037] In another embodiment, please refer to Figure 3 、 11As shown, a second thermostat 24 is also provided on the cast aluminum heating element 21. The second thermostat 24 is also used to detect the surface temperature of the cast aluminum heating element 21 and turn on or off according to its surface temperature. The second thermostat 24 is connected in series with the first thermostat 23, and the upper limit temperature of the second thermostat 24 is higher than the upper limit temperature of the first thermostat 23. When the first thermostat 23 fails, the surface temperature of the cast aluminum heating element 21 has exceeded the upper limit temperature of the first thermostat 23, but the first thermostat 23 is still in working state. When the surface temperature of the cast aluminum heating element 21 reaches the upper limit temperature of the second thermostat 24, the second thermostat 24 disconnects, so that the control board 19 controls the cast aluminum heating element 21 to stop heating, further improving the use safety of the cast aluminum heating element 21 and effectively preventing the safety hazard caused by the failure of the first thermostat 23.

[0038] The second thermostat 24 is preferably a manual reset thermostat, that is, when the surface temperature of the cast aluminum heating element 21 reaches or exceeds the upper limit temperature of the second thermostat 24, the second thermostat 24 disconnects, and the cast aluminum heating element 21 stops heating. Even if the surface temperature of the cast aluminum heating element 21 drops, the second thermostat 24 will not reset and work. Manual reset is required, which greatly improves the use safety of the instant hot water faucet.

[0039] In this embodiment, the instant hot water faucet further includes a housing 29. The housing 29 houses the cast aluminum heating element 21, the water inlet pipe 1, part of the flow regulating valve, and part of the water outlet faucet 2. The handle 4 and most of the water outlet faucet 2 are exposed outside the housing 29. A display screen 27 is also provided on the housing 29. The display screen 27 corresponds to the display 20 and the control board 19, so as to perform setting input operations on the control board 19 through the display screen 27. Through the setting of the housing 29, the instant hot water faucet is made more tidy and can play a role in heat insulation and insulation.

[0040] The above is only a preferred embodiment of the present invention and is not intended to limit the present application. Any modifications, equivalent replacements, improvements, etc. made within the spirit and principle of the present application shall be included within the scope of protection of the present application.

Claims

1. An instant hot water faucet, comprising a water inlet pipe, a heating device and a water outlet faucet that are connected in sequence. A flow regulating valve is provided on the water inlet pipe, and the flow regulating valve is used to regulate the water flow rate flowing from the water inlet pipe to the heating device. The flow regulating valve includes a valve stem, and is characterized in that: A trigger is provided on the valve stem. The trigger rotates together with the valve stem. The rotation trajectory of the trigger includes a starting position, an intermediate position, and a terminating position. The trigger rotates between the starting position and the terminating position. A microswitch is provided between the intermediate position and the terminating position. The microswitch is adjacent to the intermediate position and is provided on the power connection line of the heating device.

2. The instant hot water faucet according to claim 1, wherein: When the trigger is in the starting position, one end of the trigger is at the starting position and the other end of the trigger is between the starting position and the intermediate position. When the trigger is in the terminating position, the end of the trigger away from the starting position is at the terminating position.

3. The instant hot water faucet according to claim 2, wherein: The arc length of the trigger is greater than or equal to the arc length from the intermediate position to the terminating position, and the arc length of the trigger is less than the arc length from the starting position to the intermediate position.

4. The instant hot water faucet according to claim 1, characterized in that: When the trigger rotates from the starting position to the intermediate position, the water flow rate from the water inlet pipe to the heating device gradually increases. When the trigger rotates from the intermediate position to the terminating position, the water flow rate from the water inlet pipe to the heating device gradually decreases.

5. The instant hot water faucet according to claim 4, wherein: When the trigger rotates from the terminating position to the intermediate position, the water flow rate from the water inlet pipe to the heating device gradually increases. When the trigger rotates from the intermediate position to the starting position, the water flow rate from the water inlet pipe to the heating device gradually decreases.

6. The instant hot water faucet according to claim 1, wherein: It further includes a Hall switch and a rotor. The rotor is provided in the water inlet pipe. The Hall switch is provided on the power connection line of the heating device. The Hall switch is connected in series with the microswitch and conducts when the Hall switch senses the rotation of the rotor.

7. The instant hot water faucet according to claim 1, characterized in that: A control board electrically connected to it is provided on the outer periphery of the heating device. The control board is electrically connected to the microswitch.

8. The instant hot water faucet according to claim 7, wherein: A first temperature controller for detecting the surface temperature of the heating device and turning on or off according to the surface temperature is provided on the heating device. The first temperature controller is electrically connected to the control board.

9. The instant hot water faucet according to claim 8, wherein: A second temperature controller for detecting the surface temperature of the heating device and turning on or off according to the surface temperature is further provided on the heating device. The second temperature controller is connected in series with the first temperature controller, and the upper limit temperature of the second temperature controller is higher than the upper limit temperature of the first temperature controller.

10. The instant hot water faucet according to claim 7, wherein: A protection device is provided outside the heating device. The control board is provided on the outer periphery of the protection device.

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