Heating device and boiling detection device

Abstract

The invention discloses a heating device and a boiling detection device, and the boiling detection device comprises a steam flow channel which is provided with an inlet for inputting steam; the impeller is arranged in the steam flow channel and can be driven by the steam input into the steam flow channel to rotate; the rotating speed detection device is used for detecting the rotating speed of the impeller; and the controller is electrically connected to the rotating speed detection device and is configured to determine that the water is boiled when the current rotating speed of the impeller is greater than or equal to a preset rotating speed. The technical scheme provided by the invention aims to solve the technical problem that water boiling is difficult to accurately detect at one time due to different boiling points at different altitudes.

Description

Technical Field

[0001] The present invention relates to the field of electrical appliances, and particularly to a heating device and a boiling detection device. Background Art

[0002] Existing electric water heaters all use temperature sensors to measure the water temperature and judge whether the water is boiling according to the water temperature. However, since the temperature sensor does not directly contact the water, there is a large delay in the measurement of the water temperature by the temperature sensor. Therefore, when the water temperature rises close to the boiling point, the power needs to be reduced in advance, thus prolonging the boiling time. Moreover, the boiling point in the plateau is low and not fixed. Many electric water heaters determine the boiling point of the area by boiling water once first, and then control the electric water heater according to the boiling point determined this time every time boiling water. However, when the electric water heater changes the usage area, the boiling point will change again and the boiling point needs to be reconfirmed. Summary of the Invention

[0003] The present invention aims to solve the technical problem that it is difficult to accurately detect the boiling of water at one time due to different boiling points at different altitudes.

[0004] To achieve the above object, the present invention provides a boiling detection device, which includes:

[0005] A steam flow channel provided with an inlet for steam input;

[0006] An impeller disposed in the steam flow channel and capable of being rotated by the steam input into the steam flow channel;

[0007] A rotational speed detection device for detecting the rotational speed of the impeller; and

[0008] A controller electrically connected to the rotational speed detection device and configured to determine that the water has boiled when the current rotational speed of the impeller is greater than or equal to a preset rotational speed.

[0009] In a schematic embodiment, the impeller includes a rotating shaft and a plurality of blades radially extending outward from the rotating shaft, and the axis of the rotating shaft is perpendicular to the axis of the steam flow channel;

[0010] The steam flow channel is provided with injection holes, and the injection holes can inject steam in a direction perpendicular to the axis of the rotating shaft to the blades on one side of the rotating shaft.

[0011] In a schematic embodiment, the impeller is disposed in the steam flow channel, the rotating shaft is rotatably connected to the steam flow channel, the steam flow channel is provided with a partition portion between the impeller and the inlet, and the injection holes are provided on the partition portion; or,

[0012] The impeller is arranged outside the steam flow channel and near one end of the steam flow channel facing away from the inlet, and the injection holes are arranged at one end of the steam flow channel facing away from the inlet and towards the blades on one side of the rotating shaft.

[0013] In a schematic embodiment, the diameter of the injection holes tapers in the direction approaching the impeller.

[0014] In a schematic embodiment, at least 3 blades are provided, and they are evenly distributed in the circumferential direction of the rotating shaft.

[0015] In a schematic embodiment, the rotational speed detection device includes:

[0016] A permanent magnet, arranged on the blades of the impeller; and

[0017] A Hall sensor, electrically connected to the controller and near the movement path of the permanent magnet;

[0018] Wherein, the Hall sensor is configured to be triggered when the permanent magnet approaches, and the number of times the Hall sensor is triggered per unit time represents the rotational speed of the impeller.

[0019] In a schematic embodiment, the Hall sensor is arranged outside the steam flow channel.

[0020] In a schematic embodiment, a plurality of permanent magnets are provided, and the plurality of permanent magnets are respectively arranged on different blades.

[0021] In a schematic embodiment, the permanent magnet is arranged on each blade.

[0022] In a schematic embodiment, the rotational speed detection device includes an encoder, and the encoder is connected to the rotating shaft of the impeller and electrically connected to the controller.

[0023] This application also proposes a heating device, which includes the boiling detection device as described above and a liquid heater;

[0024] The liquid heater is provided with a liquid storage cavity, an exhaust port communicated with the liquid storage cavity, and a heating device arranged below the liquid storage cavity;

[0025] The inlet is communicated with the exhaust port.

[0026] In a schematic embodiment, the liquid heater is an electric kettle;

[0027] The electric kettle includes a kettle body and a handle arranged on the kettle body;

[0028] The liquid storage cavity is arranged inside the kettle body, the exhaust port is arranged at the connection between the top of the kettle body and the handle, the steam flow channel is arranged inside the handle, and a fluid outlet communicating with the end of the steam flow channel facing away from the inlet is arranged at the bottom end of the handle.

[0029] In a schematic embodiment, it is characterized in that the fluid outlet communicates with the liquid storage cavity.

[0030] After installing the boiling detection device on the liquid heater, during the process of the liquid heater heating water, as the water temperature rises, the amount of steam delivered from the liquid heater into the steam flow channel gradually increases, and the speed of the steam driving the impeller to rotate gradually increases. During this process, the rotation speed detection device monitors the rotation speed of the impeller. When the current rotation speed of the impeller detected by the rotation speed detection device reaches the preset rotation speed, the controller confirms that the water in the liquid heater has reached the boiling state. Since the amount of steam after water boiling has nothing to do with the altitude where the liquid heater is located, therefore, at different altitudes, using this boiling detection device can also accurately measure whether the water is boiling at one time. At the same time, the delay of this boiling detection device in detecting the boiling of the incoming water is very small, and it can immediately confirm the boiling state of the water after the water boils. Description of the Drawings

[0031] In order to more clearly illustrate the technical solutions in the embodiments of the present invention or the prior art, the following will briefly introduce the drawings required for use in the description of the embodiments or the prior art. Obviously, the following-described drawings are only some embodiments of the present invention. For those of ordinary skill in the art, without creative efforts, other drawings can also be obtained based on the structures shown in these drawings.

[0032] Figure 1 It is a schematic diagram of a boiling detection device in an embodiment of the present invention.

[0033] Explanation of the Reference Numerals in the Drawings:

[0034] 100. Boiling detection device; 1. Steam flow channel; 11. Inlet; 12. Outlet; 13. Partition part; 131. Injection hole; 2. Impeller; 21. Rotating shaft; 22. Blade; 3. Rotation speed detection device; 31. Hall sensor; 32. Permanent magnet; 4. Controller.

[0035] The realization, functional characteristics and advantages of the object of the present invention will be further described in combination with the embodiments and with reference to the drawings. Detailed Embodiment

[0036] Next, the technical solutions in the embodiments of the present invention will be clearly and completely described in conjunction with the accompanying drawings in the embodiments of the present invention. Obviously, the described embodiments are only a part of the embodiments of the present invention, rather than all embodiments. All other embodiments obtained by those of ordinary skill in the art based on the embodiments of the present invention without making creative efforts shall fall within the protection scope of the present invention.

[0037] It should be noted that all directional indications (such as up, down, left, right, front, back...) in the embodiments of the present invention are only used to explain the relative positional relationship and movement conditions between components in a specific posture (as shown in the accompanying drawings). If the specific posture changes, the directional indications will also change accordingly.

[0038] In addition, in the present invention, descriptions such as "first" and "second" are only for descriptive purposes, and cannot be understood as indicating or implying their relative importance or implicitly indicating the quantity of the indicated technical features. Thus, features defined with "first" and "second" may explicitly or implicitly include at least one of such features. In the description of the present invention, the meaning of "a plurality" is at least two, such as two, three, etc., unless otherwise specifically defined.

[0039] In the present invention, unless otherwise clearly defined and limited, terms such as "connection" and "fixation" shall be understood in a broad sense. For example, "fixation" may be a fixed connection, a detachable connection, or integrated; it may be a mechanical connection or an electrical connection; it may be directly connected or indirectly connected through an intermediate medium, and may be the communication inside two elements or the interaction relationship between two elements, unless otherwise clearly limited. For those of ordinary skill in the art, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0040] In addition, the technical solutions between various embodiments of the present invention can be combined with each other, but it must be based on the ability of those of ordinary skill in the art to implement. When the combination of technical solutions results in contradictions or cannot be implemented, it should be considered that such a combination of technical solutions does not exist and is not within the protection scope required by the present invention.

[0041] This embodiment provides a heating device, which includes a liquid heater and a boiling detection device 100. The liquid heater is a device that can hold water and heat the contained water to boiling. The boiling detection device 100 is installed on the liquid heater and is used to detect whether the liquid heater heats the water to boiling.

[0042] The liquid heater is provided with an exhaust port, which can discharge steam from the liquid heater when the water in the liquid heater boils. The exhaust port of the liquid heater can be the spout of the liquid heater, and the exhaust port of the liquid heater can also be an opening on the body or the lid of the liquid heater.

[0043] As Figure 1 shown, Figure 1 Figure 100 shows a boiling detection device 100 in this embodiment. The boiling detection device 100 includes a steam flow channel 1, an impeller 2, a rotational speed detection device 3, and a controller 4.

[0044] The steam flow channel 1 can be a straight pipe. One end of the steam flow channel 1 is provided with an inlet 11, and the other end of the steam flow channel 1 is provided with an outlet 12. The inlet 11 of the steam flow channel 1 is for steam to enter. After the steam enters the steam flow channel 1 from the inlet 11 of the steam flow channel 1, it flows along the steam flow channel 1 towards the outlet 12 of the steam flow channel 1 and then is discharged from the outlet 12 of the steam flow channel 1. The inlet 11 of the steam flow channel 1 is used to connect to the exhaust port of the liquid heater.

[0045] The impeller 2 is arranged in the steam flow channel 1. The impeller 2 can be arranged at the middle position of the steam flow channel 1. The impeller 2 is rotatably connected to the steam flow channel 1. A rotating shaft is arranged on the impeller 2, and two axially aligned shaft holes are arranged on the steam flow channel 1. Both ends of the rotating shaft of the impeller 2 are respectively inserted through the two shaft holes. The impeller 2 is arranged to be driven to rotate by the steam flowing through the steam flow channel 1.

[0046] The controller 4 is the logic control unit of the boiling detection device 100. The controller 4 can be a single-chip microcomputer. The rotational speed detection device 3 is used to detect the rotational speed of the impeller 2 in real time. The rotational speed detection device 3 is electrically connected to the controller 4. The rotational speed detection device 3 sends the measured current rotational speed to the controller 4. After receiving the current rotational speed, the controller 4 compares the current rotational speed with a preset rotational speed. When the current rotational speed is less than the preset rotational speed, it is considered that the water has not boiled, and when the current rotational speed is greater than or equal to the preset rotational speed, it is confirmed that the water has boiled. The preset rotational speed is the rotational speed that the impeller 2 can reach when the water in the liquid heater boils, and this preset rotational speed can be calibrated in advance.

[0047] During the process of heating water by the liquid heater, as the water temperature rises, the amount of steam delivered from the liquid heater into the steam flow channel 1 gradually increases, and the rotational speed of the impeller 2 driven by the steam gradually increases. During this process, the rotational speed detection device 3 monitors the rotational speed of the impeller 2. When the current rotational speed of the impeller 2 detected by the rotational speed detection device 3 reaches the preset rotational speed, the controller 4 confirms that the water in the liquid heater has reached the boiling state. Since the amount of steam after water boils has nothing to do with the boiling point of water, therefore, at different altitudes, using this boiling detection device 100 can also accurately detect whether the water is boiling. At the same time, the delay of this boiling detection device 100 in detecting the boiling of the incoming water is very small, and it can immediately confirm the boiling state of the water after the water boils. The liquid heater does not need to reduce the power when approaching boiling, which can effectively reduce the boiling time of the water.

[0048] In a schematic embodiment, the impeller 2 includes a rotating shaft 21 and a plurality of blades 22. The rotating shaft 21 can be configured as a cylindrical shape. A rotating shaft is provided on the rotating shaft 21, and the rotating shaft 21 is rotatably connected to the steam flow channel 1, and the rotating shaft 21 can rotate around its own axis. The axis of the steam flow channel 1 is perpendicular to the axis of the rotating shaft 21.

[0049] The plurality of blades 22 are distributed on the outer peripheral surface of the rotating shaft 21. The blades 22 radially extend outward from the outer peripheral surface of the rotating shaft 21. The blades 22 can be configured as flat plates. The plate surface of the blades 22 is parallel to the axis of the rotating shaft 21.

[0050] A partition portion 13 is provided in the steam flow channel 1. The partition portion 13 can be a plate-like structure. The partition portion 13 divides the internal channel of the steam flow channel 1 into two ends. The partition portion 13 can be a plate-like structure, and the two plate surfaces of the partition portion 13 face the inlet 11 and the outlet 12 respectively. The partition portion 13 is provided between the impeller 2 and the inlet 11 of the steam flow channel 1, and the impeller 2 is located downstream of the partition portion 13. A jet hole 131 is provided on the partition portion 13. The jet hole 131 is a through hole that penetrates the partition portion 13. The extending direction of the jet hole 131 is the same as the extending direction of the steam flow channel 1. Steam enters the jet hole 131 from one end of the jet hole 131 close to the inlet 11 of the steam flow channel 1 and ejects from one end of the jet hole 131 close to the outlet 12 of the steam flow channel 1. One end of the jet hole 131 close to the outlet 12 of the steam flow channel 1 faces the gap between the outer peripheral surface of the rotating shaft 21 and the inner peripheral surface of the steam flow channel 1. The jet hole 131 can jet steam towards the blade 22 on one side of the rotating shaft 21 in a direction perpendicular to the axis of the rotating shaft 21.

[0051] Since the partition portion 13 is provided in the steam flow channel 1, the flow channel of the steam in the steam flow channel 1 will suddenly become narrower at the injection holes 131 of the partition portion 13, so that the flow velocity of the steam increases when flowing through the injection holes 131. Also, since one end of the injection hole 131 faces the gap between the outer peripheral surface of the rotating shaft 21 and the inner peripheral surface of the steam flow channel 1, the steam with a higher flow velocity jetting into this gap can push the blades 22 in this gap. Even if the amount of steam input into the steam flow channel 1 is small, it can still push the impeller 2 to rotate. Thus, the boiling detection device 100 has a relatively high sensitivity in detecting the boiling of the incoming water.

[0052] In a schematic embodiment, the diameter of the injection hole 131 tapers in the direction close to the impeller 2. In this embodiment, the partition portion 13 is configured to arch towards the impeller 2 side, and the injection hole 131 penetrates through the partition portion 13 on the steam flow channel 1.

[0053] In this way, the diameter of the injection hole 131 gradually decreases from the end close to the inlet 11 of the steam flow channel 1 to the end close to the impeller 2. The tapered injection hole 131 can reduce the resistance of the partition portion 13 to the steam and increase the flow velocity of the steam output from the injection hole 131.

[0054] In a schematic embodiment, at least 3 blades 22 are provided. The number of blades 22 can be 3, 4, or 5. The multiple blades 22 are evenly distributed in the circumferential direction of the rotating shaft 21. The included angle between the center connection lines of two adjacent blades 22 and the center of the rotating shaft 21 is the same.

[0055] The number of blades 22 is at least 3, and at least 3 blades 22 are evenly distributed on the rotating shaft 21, which can ensure that at least 1 blade 22 on the impeller 2 is always in the gap between the outer peripheral surface of the rotating shaft 21 and the inner peripheral surface of the steam flow channel 1 to receive the steam flow jetted from the injection hole 131.

[0056] In another schematic embodiment, the impeller 2 is arranged outside the steam flow channel 1. The impeller 2 is located near the end of the steam flow channel 1 facing away from its inlet 11. The injection hole of the steam flow channel 1 is arranged at the end of the steam flow channel 1 facing away from the inlet 11. The injection hole of the steam flow channel 1 can be the port at the end of the steam flow channel 1 facing away from the inlet 11. The injection hole 131 can jet steam towards the blade 22 on one side of the rotating shaft 21 in a direction perpendicular to the axis of the rotating shaft 21, thereby driving the impeller 2 to rotate.

[0057] In a schematic embodiment, the rotational speed detection device 3 includes a permanent magnet 32 and a Hall sensor 31. The permanent magnet 32 is a magnet that can maintain its magnetism for a long time. The permanent magnet 32 can be an alnico magnet, a samarium-cobalt magnet, a neodymium magnet, or a ferrite magnet. The permanent magnet 32 is arranged on the blade 22. The permanent magnet 32 can be arranged on one surface of the blade 22, or the permanent magnet 32 can be arranged at one end of the blade 22 facing away from the disk. The permanent magnet 32 and the blade 22 can be connected by bonding, welding, or screwing. The permanent magnet 32 can follow the rotation of the blade 22 to perform a circular motion, and the motion path of the permanent magnet 32 is a circular path.

[0058] The Hall sensor 31 is electrically connected to the controller 4 through a cable. The Hall sensor 31 is close to the motion path of the permanent magnet 32. The distance between the Hall sensor 31 and the motion path of the permanent magnet 32 is less than. The Hall sensor 31 can be arranged outside the motion path of the permanent magnet 32. The Hall sensor 31 can detect the change of the magnetic field, and the Hall sensor 31 is triggered when the permanent magnet 32 rotates close to the Hall sensor 31. The Hall sensor 31 is configured to send a trigger signal to the controller 4 when it senses the approach of the permanent magnet 32.

[0059] Since the number of times the Hall sensor 31 is triggered per unit time is positively correlated with the rotational speed of the impeller 2, the number of times the Hall sensor 31 is triggered per unit time can be used to characterize the rotational speed of the impeller 2. The controller 4 can be configured to calculate the rotational speed of the impeller 2 according to the number of trigger signals received per unit time and the number of blades 22 on the impeller 2 where the permanent magnet 32 is installed. For example, when the number of blades 22 on the impeller 2 where the permanent magnet 32 is installed is N, the Hall sensor 31 is triggered N times when the impeller 2 rotates one circle. Therefore, the average rotational speed of the impeller 2 per unit time is obtained by dividing the number M of trigger signals received per unit time by the number N of blades 22 where the permanent magnet 32 is installed.

[0060] The Hall sensor 31 can detect the rotational speed of the impeller 2 without contact, will not interfere with the rotation of the impeller 2, and has high detection accuracy.

[0061] In a schematic embodiment, the Hall sensor 31 is arranged outside the steam flow channel 1. The Hall sensor 31 can be arranged at an interval from the steam flow channel 1. The Hall sensor 31 is arranged outside the steam flow channel 1, does not need to contact high-temperature steam, does not operate in a high-temperature and high-humidity environment, and is not easily damaged.

[0062] In a schematic embodiment, a plurality of permanent magnets 32 are arranged, for example, 2, 3, or 4. The plurality of permanent magnets 32 are respectively arranged on different blades 22. The Hall sensor 31 is triggered multiple times when the impeller 2 rotates one circle, and when the rotational speed of the impeller 2 changes, it can be detected more sensitively by the Hall sensor 31, improving the measurement accuracy of the detected rotational speed.

[0063] Preferably, a permanent magnet 32 is provided on each blade 22. In this way, the Hall sensor 31 will be triggered every time each blade 22 passes by the Hall sensor 31, further improving the rotational speed measurement accuracy.

[0064] In a schematic embodiment, the size of the injection hole 131 is adjustable.

[0065] The aperture of the injection hole 131 can be adjusted according to the heating power of the liquid heater, so that the boiling detection device 100 can be adapted to liquid heaters with different powers, and the application range of the boiling detection device 100 is wider.

[0066] In a schematic embodiment, the liquid heater is an electric kettle. The liquid heater includes a kettle body and a handle. The kettle body includes a liquid storage cavity, an exhaust port, and an electric heating module. The liquid storage cavity is used to hold liquid, such as water. The exhaust port is communicated with the liquid storage cavity and is also communicated with the inlet 11. The electric heating module is arranged below the liquid storage cavity and is used to heat the liquid contained in the liquid storage cavity. The electric heating module can be an electric heating coil. The electric heating module can heat the liquid in the liquid storage cavity to boiling, and the steam can enter the exhaust port from the liquid storage cavity, and then be input into the steam flow channel 1 through the exhaust port to drive the impeller 2 to rotate. The handle is arranged outside the kettle body and is connected to the kettle body. The handle can be configured in an arc shape.

[0067] In a schematic embodiment, the steam flow channel 1 is arranged in the handle, and the steam flow channel 1 extends along the handle. The exhaust port is arranged at the connection between the top of the kettle body and the handle, and a fluid outlet communicated with the end of the steam flow channel 1 facing away from the inlet 11 is arranged at the bottom end of the handle.

[0068] In this way, part of the steam will condense when the steam flows through the steam flow channel 1, and the condensed water can flow out of the steam flow channel 1 from the fluid outlet, which is convenient for collecting the condensed water.

[0069] In a schematic embodiment, the fluid outlet is communicated with the liquid storage cavity, and the condensed water flowing out of the fluid outlet can flow back into the liquid storage cavity.

[0070] In another schematic embodiment, the rotational speed detection device 3 includes an encoder. The encoder is electrically connected to the controller 4. The encoder includes a body and a main shaft, and the main shaft extends out of the body. The body can be arranged outside the steam flow channel 1 and can be fixed on the outer wall of the steam flow channel 1. The main shaft of the encoder is connected to the rotating shaft 21 of the impeller 2, and this main shaft can rotate following the rotating shaft 21 of the impeller 2. The encoder can measure the rotational speed information of the impeller 2 and send the rotational speed information of the impeller 2 to the controller 4.

[0071] The above are only the preferred embodiments of the present invention, and do not limit the patent scope of the present invention. Any equivalent structural transformation made under the concept of the present invention by using the content of the specification and drawings of the present invention, or any direct / indirect application in other related technical fields, is included in the patent protection scope of the present invention.

Claims

1. A boiling detection device, characterized in that, it includes: A steam flow channel provided with an inlet for steam input; An impeller arranged in the steam flow channel, which can be driven by the steam input into the steam flow channel to rotate; A rotational speed detection device for detecting the rotational speed of the impeller; and A controller electrically connected to the rotational speed detection device, configured to determine that the water has boiled when the current rotational speed of the impeller is greater than or equal to a preset rotational speed.

2. The boiling detection device according to claim 1, characterized in that, The impeller includes a rotating shaft and a plurality of blades radially extending outward from the rotating shaft, and the axis of the rotating shaft is perpendicular to the axis of the steam flow channel; The steam flow channel is provided with injection holes, and the injection holes can inject steam toward the blades on one side of the rotating shaft in a direction perpendicular to the axis of the rotating shaft.

3. The boiling detection device according to claim 2, characterized in that, The impeller is arranged in the steam flow channel, the rotating shaft is rotatably connected to the steam flow channel, the steam flow channel is provided with a partition between the impeller and the inlet, and the injection holes are arranged on the partition; or, The impeller is arranged outside the steam flow channel and near one end of the steam flow channel facing away from the inlet, and the injection holes are arranged at one end of the steam flow channel facing away from the inlet and facing the blades on one side of the rotating shaft.

4. The boiling detection device according to claim 2, characterized in that, The diameter of the injection holes tapers in the direction close to the impeller.

5. The boiling detection device according to claim 2, characterized in that, There are at least 3 blades, and they are evenly distributed in the circumferential direction of the rotating shaft.

6. The boiling detection device according to any one of claims 1 to 5, characterized in that, The rotational speed detection device includes: A permanent magnet arranged on the blades of the impeller; and A Hall sensor electrically connected to the controller and close to the movement path of the permanent magnet; wherein, the Hall sensor is configured to be triggered when the permanent magnet is sensed to approach, and the number of times the Hall sensor is triggered per unit time represents the rotational speed.

7. The boiling detection device according to claim 6, characterized in that, The Hall sensor is arranged outside the steam flow channel.

8. The boiling detection device according to claim 6, characterized in that, There are a plurality of permanent magnets, and the plurality of permanent magnets are respectively arranged on different blades.

9. The boiling detection device according to any one of claims 2 to 5, characterized in that, The size of the injection holes is adjustable.

10. The boiling detection device according to any one of claims 1 to 5, characterized in that, The rotational speed detection device includes an encoder, and the encoder is connected to the rotating shaft of the impeller and electrically connected to the controller.

11. A heating device, characterized in that, it includes the boiling detection device according to any one of claims 1 to 10 and a liquid heater; The liquid heater is provided with a liquid storage cavity, an exhaust port communicated with the liquid storage cavity, and an electric heating module arranged below the liquid storage cavity; The inlet is communicated with the exhaust port.

12. The heating device according to claim 11, wherein, the liquid heater is an electric kettle; the liquid heater includes a kettle body and a handle provided on the kettle body; the kettle body includes the liquid storage cavity and the electric heating module, the exhaust port is provided at the connection between the top of the kettle body and the handle, the steam flow channel is provided in the handle, and a fluid outlet communicating with the end of the steam flow channel opposite to the inlet is provided at the bottom end of the handle.

13. The heating device according to claim 12, wherein, the fluid outlet communicates with the liquid storage cavity.

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