Liquid heater

Abstract

The utility model relates to a kind of liquid heater, including shell assembly, heating seat, control device and sealing plug, heating cavity is formed in shell assembly, and first through-hole is set up with heating cavity communication on shell assembly;Heating seat is used to heat heating cavity;Control device includes control circuit board and control switch, control switch triggers the change of switch state using the change of external magnetic field, control circuit board is electrically connected with control switch, heating seat respectively, control circuit board is configured as the working state of control switch drive heating seat;Sealing plug is at least partly magnetic material, sealing plug at least has first position and second position, sealing plug is located first position, sealing plug is assembled on first through-hole and seals first through-hole;Sealing plug is located second position, sealing plug is assembled in the side of shell assembly adjacent control switch and changes the working state of control switch.

Description

Technical Field

[0001] This utility model relates to the field of liquid heating technology, and in particular to a liquid heater. Background Technology

[0002] Liquid heaters (such as electric kettles, coffee makers, constant temperature water dispensers, and soy milk makers) continuously generate high-temperature steam when heating liquids in a closed or semi-closed cavity. While mechanical pressure relief valves (such as gravity valves and spring safety valves) provide basic pressure relief protection, they rely excessively on user-initiated pressure relief. In such cases, if the user forgets to operate, operates late (e.g., temporarily leaves the room), or misoperates (e.g., forcibly opens the lid), the continuously accumulating steam pressure inside the heating cavity may exceed the cavity's pressure-bearing limit, leading to explosions, high-temperature liquid splashing, or parts flying off, causing burns, electric shocks, or fires. Utility Model Content

[0003] Therefore, it is necessary to provide a liquid heater that addresses the aforementioned problems with existing liquid heaters.

[0004] This application provides a liquid heater, comprising:

[0005] A housing assembly having a heating cavity formed therein, and a first through hole communicating with the heating cavity is provided on the housing assembly;

[0006] A heating base for heating the heating chamber;

[0007] A control device includes a control circuit board and a control switch. The control switch uses a change in an external magnetic field to trigger a change in its state. The control circuit board is electrically connected to the control switch and the heating base, respectively. The control circuit board is configured to drive the heating base according to the working state of the control switch.

[0008] A sealing plug, at least partially made of magnetic material, having at least a first position and a second position, wherein when the sealing plug is in the first position, it is fitted onto the first through hole and seals the first through hole; and when the sealing plug is in the second position, it is fitted onto the side of the housing assembly adjacent to the control switch and changes the operating state of the control switch.

[0009] This application discloses a liquid heater with a housing assembly having a heating chamber and a first through hole. The heating chamber is connected to the outside atmosphere through the first through hole. A heating seat, controlled by a control circuit board, heats the heating chamber. A sealing plug can be installed at least in a first position and a second position on the housing assembly. Specifically, when the sealing plug is in the first position, it is inserted into the first through hole to seal it, thereby isolating the heating chamber from the outside atmosphere. When the sealing plug is in the second position, it is installed on the side of the housing assembly near a control switch. The control switch uses a change in an external magnetic field to trigger a change in its state. When the magnetic sealing plug approaches the control switch, the switch's state changes, thereby driving the control circuit board to activate the heating seat. Since the sealing plug can both block the first through hole and change the control switch's state, when heating is required, the sealing plug on the first through hole must be removed and installed on the end of the housing assembly near the control switch to ensure that the heating chamber is connected to the outside atmosphere through the first through hole during heating, thus achieving pressure relief.

[0010] In one embodiment, the sealing plug includes a plug body and a magnet, the plug body is made of an elastic material, the plug body covers the periphery of the magnet, and the plug body is interference-fitted with the sidewall of the first through hole.

[0011] In the liquid heater described above, the plug is made of an elastic material. When the plug is inserted into the first through hole, the plug and the first through hole are press-fitted together, so that the surface of the plug is in close contact with the inner wall of the first through hole, ensuring a sealing effect on the first through hole. At the same time, by covering the magnet with the plug, when the sealing plug is in the first position, the plug can prevent the liquid in the heating chamber from coming into contact with the magnet, ensuring food safety.

[0012] In one embodiment, the surface of the plug is provided with a limiting portion, and when the sealing plug is in the first position, the limiting portion engages with the first through hole.

[0013] The liquid heater in the above embodiment has a limiting part on the surface of the plug to prevent the plug from falling into the heating chamber due to excessive force during the insertion of the plug through the first through hole, thus improving the rationality of the design.

[0014] In one embodiment, the sealing plug further includes a connecting rope, the two ends of which are connected to the plug body and the housing assembly, respectively.

[0015] In the above embodiments, the liquid heater is fixed to the housing assembly by a plug and a connecting rope to prevent the sealing plug from being easily lost.

[0016] In one embodiment, the housing assembly includes an inner liner, an outer shell, and a cap. The outer shell is fitted around the outer periphery of the inner liner. The inner liner has the heating chamber. The cap is movably disposed on the outer shell or the inner liner and is used to seal the opening of the heating chamber. The cap has the first through hole.

[0017] In some embodiments, a first sealing ring is provided between the bottle cap and the outer shell or inner liner.

[0018] In some embodiments, a handle is provided on the bottle cap or casing.

[0019] In one embodiment, the gap between the outer shell and the inner liner forms an installation cavity, and the heating seat and the control device are both located in the installation cavity. A first groove is formed on the surface of the outer shell, and the first groove is disposed adjacent to the control switch. When the sealing plug is in the second position, the sealing plug is inserted into the first groove and disposed opposite to the control switch.

[0020] In the liquid heater of the above embodiment, a first groove is opened on the surface of the outer shell near the control switch. After the sealing plug is removed from the first through hole, it can be inserted into the first groove for fixation. The magnet in the sealing plug realizes the change of the magnetic field of the control switch, thereby changing the on / off state of the control switch. Based on the above design, the user's operation difficulty is reduced.

[0021] In one embodiment, the outer casing includes a first casing and a second casing, the second casing being detachably connected to the bottle cap and the first casing, respectively.

[0022] The liquid heater in the above embodiments is detachably connected to the first housing via the second housing, which facilitates the assembly of structures such as the inner liner, control device, or heating base on the mounting cavity, as well as future maintenance.

[0023] In one embodiment, a stirring device is also included, which includes a drive motor and a stirring paddle. The stirring paddle is located inside the heating chamber, and the output shaft of the drive motor extends into the heating chamber and is drively connected to the stirring paddle.

[0024] The liquid heater in the above embodiments includes a stirring device inside. The device is connected to a stirring paddle inside the heating chamber via the output shaft of a drive motor. When the drive motor operates, it drives the stirring paddle to rotate within the heating chamber, thereby stirring the liquid. In other embodiments, the stirring paddle has blades to break down or crush fruits, vegetables, meats, or other foods added to the heating chamber. For example, the liquid heater of this application can be used as a soymilk maker. When soybeans and water are added to the heating chamber, the stirring device first breaks down the soybeans, and then the heating base heats the mixture within the heating chamber to produce soymilk.

[0025] In one embodiment, the inner liner is a hollow shell structure with openings at both ends, the heating seat is provided on the opening of the inner liner away from the bottle cap, the heating seat has a second through hole, and the output shaft of the drive motor passes through the second through hole and extends into the heating cavity.

[0026] In the above embodiment, the liquid heater uses a heating seat as the base of the inner liner, and the heating seat is directly connected to the heating chamber, thereby improving the heating efficiency. In addition, by opening a second through hole in the heating seat, the output shaft of the drive motor can pass through the second through hole and be directly connected to the stirring paddle in the heating chamber, simplifying the structure of the cooperation between the heating seat, the stirring device and the inner liner.

[0027] In one embodiment, a second sealing ring is provided between the output shaft of the drive motor and the second through hole.

[0028] In one embodiment, the liquid heater further includes a temperature sensor electrically connected to the control circuit board, the temperature sensor being used to monitor temperature changes in the heating chamber.

[0029] The liquid heater in the above embodiments uses a temperature sensor to obtain the temperature of the heating chamber in real time. When an abnormally high temperature is detected, such as dry burning or a malfunction, the power is automatically cut off to avoid equipment damage or fire. Moreover, precise temperatures can be set for different uses, such as making soy milk, coffee, and milk powder, to improve the intelligence of the equipment.

[0030] In one embodiment, the liquid heater further includes a power supply module electrically connected to the control circuit board, the power supply module including a rechargeable battery pack and / or a power supply interface. Attached Figure Description

[0031] Figure 1 This is a schematic diagram of the liquid heater in one embodiment (the sealing plug is in the first position).

[0032] Figure 2This is a schematic diagram of the liquid heater in one embodiment (the sealing plug is in the second position).

[0033] Figure 3 This is a cross-sectional view of a liquid heater in one embodiment;

[0034] Figure 4 for Figure 3 Enlarged view of section A.

[0035] The correspondence between the reference numerals and the component names is as follows:

[0036] 10 Shell assembly, 11 Inner liner, 12 Outer shell, 121 First shell, 122 Second shell, 13 Bottle cap, 14 Handle, 101 Heating chamber, 102 First through hole, 103 Mounting chamber, 104 First groove, 1010 First sealing ring;

[0037] 20 Heating base, 201 Second through hole;

[0038] 30 Control device, 31 Control circuit board, 32 Control switch;

[0039] 40 Sealing plug, 41 Plug body, 411 Limiting part, 42 Magnet, 43 Connecting rope;

[0040] 50 Stirring device, 51 Drive motor, 52 Stirring blade, 5010 Second sealing ring;

[0041] 60 Temperature sensor. Detailed Implementation

[0042] To better understand the above-mentioned objectives, features, and advantages of the present invention, the present invention will be further described in detail below with reference to the accompanying drawings and specific embodiments. It should be noted that, unless otherwise specified, the embodiments and features described in these embodiments can be combined with each other.

[0043] Many specific details are set forth in the following description in order to provide a full understanding of the invention. However, the invention may also be practiced in other ways different from those described herein, and therefore the scope of protection of the invention is not limited to the specific embodiments disclosed below.

[0044] Some embodiments of the liquid heater of the present invention are described below with reference to the accompanying drawings.

[0045] like Figures 1 to 4 As shown, this embodiment discloses a liquid heater, including:

[0046] The housing assembly 10 has a heating cavity 101 formed inside it, and a first through hole 102 communicating with the heating cavity 101 is provided on the housing assembly 10.

[0047] Heating base 20, heating base 20 is used to heat heating chamber 101;

[0048] The control device 30 includes a control circuit board 31 and a control switch 32. The control switch 32 uses the change of external magnetic field to trigger the change of switch state. The control circuit board 31 is electrically connected to the control switch 32 and the heating base 20 respectively. The control circuit board 31 is configured to drive the heating base 20 according to the working state of the control switch 32.

[0049] The sealing plug 40 is at least partially made of magnetic material and has at least a first position and a second position. When the sealing plug 40 is in the first position, it is fitted onto the first through hole 102 and seals the first through hole 102. When the sealing plug 40 is in the second position, it is fitted onto the side of the housing assembly 10 adjacent to the control switch 32 and changes the operating state of the control switch 32.

[0050] The liquid heater of this application has a heating chamber 101 and a first through hole 102 on the housing assembly 10. The heating chamber 101 is connected to the outside atmosphere through the first through hole 102. The heating seat 20 is controlled by the control circuit board 31 to heat the heating chamber 101. The sealing plug 40 can be installed at least in a first position and a second position on the housing assembly 10. Specifically, when the sealing plug 40 is in the first position, the sealing plug 40 is inserted into the first through hole 102 to seal the first through hole 102, thereby isolating the heating chamber 101 from the outside atmosphere. When the sealing plug 40 is in the second position, the sealing plug 40 is installed on the side of the housing assembly 10 near the control switch 32. The control switch 32 is triggered by the change of the external magnetic field. When the sealing plug 40, which has a magnetic material, is close to the control switch 32, the switching state of the control switch 32 changes, thereby driving the control circuit board 31 to perform heating work on the heating seat 20. Since the sealing plug 40 can be used to both block the first through hole 102 and change the switching state of the control switch 32, when the liquid heater of this application needs to be heated, the sealing plug 40 on the first through hole 102 must be removed and the sealing plug 40 is assembled on the end of the housing assembly 10 near the control switch 32 to ensure that during the heating process, the heating chamber 101 is connected to the outside atmosphere through the first through hole 102 to achieve pressure relief.

[0051] The control switch 32 can be triggered to change its state based on changes in the external magnetic field. The control switch 32 can be a magnetic switch or a Hall effect switch. For example, control switch 32 is a normally open magnetic switch. When an external permanent magnet approaches the magnetic switch, the reed in the magnetic switch is magnetized, generating opposite magnetic poles that attract and contact each other, thus completing the circuit. At this time, the control circuit board 31 is triggered to control the heating base 20 to work. When the external permanent magnet moves away, the reed loses its magnetism and returns to its original position due to its elasticity, breaking the circuit. At this time, the control circuit board 31 is triggered to stop the heating base 20 from working. The specific content of triggering the control circuit board 31 to control the heating base 20 to work when the circuit in the magnetic switch is completed can be as follows: when the circuit in the magnetic switch is completed, the heating base 20 is connected through the power supply circuit between the magnetic switch and the power supply, and the heating base 20 works. Alternatively, when the circuit in the magnetic switch is completed, a drive signal is generated. After the control circuit board 31 receives the drive signal, the heating base 20 is connected through the power supply circuit between the control circuit board 31 and the power supply, and the heating base 20 works. In addition, in other embodiments, control switch 32 can be a normally closed magnetic switch.

[0052] Regarding the assembly of the sealing plug 40 and the first through hole 102, the first through hole 102 can be sealed by directly inserting the sealing plug 40 into it, or the sealing plug 40 and the first through hole 102 can be connected and sealed by a threaded connection. When the sealing plug 40 is in the second position, its assembly on the housing assembly 10 can be achieved by providing a limiting structure protruding from the surface of the housing assembly 10, or a groove structure recessed towards the heating chamber 101, thereby fixing the sealing plug 40.

[0053] Additionally, in some embodiments, the liquid heater is also equipped with an indicator light (not shown in the figure), which is configured to emit a light indication signal according to the on / off state of the control switch 32. For example, when the control switch 32 is in the on state, the indicator light can emit a green light signal, indicating that the user can issue a command to drive the circuit board to control the heating base 20 to work; when the control switch 32 is in the off state, the indicator light can emit a red light signal, indicating that the heating base 20 is currently not working.

[0054] like Figure 3 and Figure 4 As shown, in addition to the features of the above embodiments, this embodiment further defines that: the sealing plug 40 includes a plug body 41 and a magnet 42, the plug body 41 is made of elastic material, the plug body 41 covers the periphery of the magnet 42, and the plug body 41 is interference-fitted with the side wall of the first through hole 102.

[0055] In the above embodiment, the liquid heater specifies that the plug 41 is made of an elastic material. When the plug 41 is inserted into the first through hole 102, the plug 41 and the first through hole 102 are interference-fitted, so that the surface of the plug 41 is in close contact with the inner wall of the first through hole 102, ensuring the sealing effect of the first through hole 102. At the same time, by covering the magnet 42 with the plug 41, when the sealing plug 40 is in the first position, the plug 41 can prevent the liquid in the heating chamber 101 from contacting the magnet 42, ensuring food safety.

[0056] The plug 41 can be made of one of the following materials: food-grade silicone, TPE, or PP. The plug 41 can be coated onto the outer surface of the magnet 42 by injection molding to form a fully enclosed structure, or the plug 41 can be made into a split structure to facilitate the assembly between the magnet 42 and the plug 41.

[0057] like Figure 3 and Figure 4 As shown, in addition to the features of the above embodiments, this embodiment further specifies that: a limiting part 411 is provided on the surface of the plug body 41, and when the sealing plug 40 is in the first position, the limiting part 411 engages with the first through hole 102.

[0058] The liquid heater in the above embodiment has a limiting part 411 on the surface of the plug 41 to prevent the plug 41 from falling into the heating chamber 101 due to excessive force during the insertion of the plug 41 through the first through hole 102, thus improving the rationality of the design.

[0059] like Figures 1 to 3 As shown, in addition to the features of the above embodiments, this embodiment further specifies that: the sealing plug 40 also includes a connecting rope 43, the two ends of which are connected to the plug body 41 and the housing assembly 10, respectively.

[0060] In the above embodiment, the liquid heater limits the plug 41 to be fixed to the housing assembly 10 by the connecting rope 43, so as to avoid the situation where the sealing plug 40 is easily lost.

[0061] The connecting rope 43 can be a one-piece molded structure made of silicone. One end is connected to the plug 41 by a one-piece molding method, and the other end is a loop structure that fits into a groove formed on the surface of the housing assembly 10 and is rotatable relative to the surface of the housing assembly 10. It should be noted that in other embodiments, the connecting rope 43 can also be made of fiber or other elastic materials. In addition, the connecting rope 43 can also be connected to the sealing plug 40 and the housing assembly 10 by means of hooks, buckles, etc.

[0062] like Figure 3As shown, in addition to the features of the above embodiments, this embodiment further defines that: the shell assembly 10 includes an inner liner 11, an outer shell 12 and a bottle cap 13, the outer shell 12 is sleeved around the inner liner 11, the inner liner 11 has a heating chamber 101, the bottle cap 13 is movably disposed on the outer shell 12 or the inner liner 11, the bottle cap 13 is used to seal the opening of the heating chamber 101, and the bottle cap 13 has a first through hole 102.

[0063] In this embodiment, the bottle cap 13 is movably connected to either the outer shell 12 or the inner liner 11. For example, the bottle cap 13 and the outer shell 12 are movably connected via a threaded connection, allowing the bottle cap 13 to be detached from the outer shell 12 for easy addition or removal of liquid into or out of the heating chamber 101 on the inner liner 11. Furthermore, it should be noted that in other embodiments, the bottle cap 13 and the outer shell 12 may be integrally formed, and the size of the first through hole 102 can be appropriately adjusted to serve as the inlet or outlet for adding or removing liquid from the heating chamber 101.

[0064] like Figure 3 As shown, in addition to the features of the above embodiments, this embodiment further specifies that a first sealing ring 1010 is provided between the bottle cap 13 and the outer shell 12 or the inner liner 11.

[0065] like Figure 1 and Figure 2 As shown, in addition to the features of the above embodiments, this embodiment further specifies that a handle 14 is provided on the bottle cap 13 or the outer shell 12.

[0066] like Figure 3 As shown, in addition to the features of the above embodiments, this embodiment further specifies that: the gap between the outer shell 12 and the inner liner 11 forms an installation cavity 103, the heating seat 20 and the control device 30 are both located in the installation cavity 103, the surface of the outer shell 12 is provided with a first groove 104, the first groove 104 is disposed adjacent to the control switch 32, when the sealing plug 40 is in the second position, the sealing plug 40 is inserted into the first groove 104 and disposed opposite to the control switch 32.

[0067] In the above embodiment, the liquid heater is designed to have a first groove 104 on the surface of the housing 12 near the control switch 32. When the sealing plug 40 is removed from the first through hole 102, it can be inserted into the first groove 104 for fixation. The magnet 42 in the sealing plug 40 changes the magnetic field of the control switch 32, thereby changing the switching state of the control switch 32. Based on the above design, the user's operating difficulty is reduced.

[0068] like Figure 3As shown, in addition to the features of the above embodiments, this embodiment further defines that: the outer shell 12 includes a first shell 121 and a second shell 122, and the second shell 122 is movably and detachably connected to the bottle cap 13 and the first shell 121 respectively.

[0069] The liquid heater in the above embodiment defines a detachable connection between the second housing 122 and the first housing 121, which facilitates the assembly of structures such as the inner liner 11, the control device 30 or the heating base 20 on the mounting cavity 103, as well as future maintenance.

[0070] The second housing 122 can be detachably connected to the bottle cap 13 and the first housing 121 by means of direct sealing, threaded connection, etc. It should be noted that the gap between the first housing 121 and the inner liner 11 can be filled with heat-insulating material.

[0071] like Figure 3 As shown, in addition to the features of the above embodiments, this embodiment further includes a stirring device 50, which includes a drive motor 51 and a stirring paddle 52. The stirring paddle 52 is located inside the heating chamber 101, and the output shaft of the drive motor 51 extends into the heating chamber 101 and is connected to the stirring paddle 52 in a transmission manner.

[0072] The liquid heater in the above embodiments is defined as having a stirring device 50 inside. The stirring device 50 is connected to the stirring paddle 52 inside the heating chamber 101 via the output shaft of a drive motor 51. When the drive motor 51 operates, it drives the stirring paddle 52 to rotate inside the heating chamber 101, thereby stirring the liquid inside the heating chamber 101. In other embodiments, the stirring paddle 52 has blades, which can be used to stir and break down foods such as fruits, vegetables, and meat when they are added to the heating chamber 101. For example, the liquid heater of this application can be used as a soy milk maker. When soybeans and water are added to the heating chamber 101, the stirring device 50 first breaks down the soybeans, and then the heating base 20 heats the mixture inside the heating chamber 101 to produce soy milk.

[0073] It should be noted that the stirring device 50 can operate depending on the on / off state of the control switch 32, or it can operate directly regardless of the on / off state of the control switch 32. For example, when the control switch 32 is in the on state, it triggers the control circuit board 31 to output a control signal to control the stirring device 50 to operate.

[0074] like Figure 3 As shown, in addition to the features of the above embodiments, this embodiment further defines: the inner liner 11 is a hollow shell structure with openings at both ends, the heating seat 20 is placed on the opening of the inner liner 11 away from the bottle cap 13, the heating seat 20 has a second through hole 201, and the output shaft of the drive motor 51 extends into the heating chamber 101 after passing through the second through hole 201.

[0075] In the above embodiment, the liquid heater defines the heating seat 20 as the base of the inner liner 11. The heating seat 20 is directly connected to the heating chamber 101, thereby improving the heating efficiency. In addition, by opening a second through hole 201 in the heating seat 20, the output shaft of the drive motor 51 can pass through the second through hole 201 and be directly connected to the stirring paddle 52 in the heating chamber 101, simplifying the structure of the cooperation between the heating seat 20, the stirring device 50 and the inner liner 11.

[0076] like Figure 3 As shown, in some embodiments, a second sealing ring 5010 is provided between the output shaft of the drive motor 51 and the second through hole 201.

[0077] like Figure 3 As shown, in addition to the features of the above embodiments, this embodiment further specifies that: the liquid heater also includes a temperature sensor 60, which is electrically connected to the control circuit board 31, and the temperature sensor 60 is used to monitor the temperature change of the heating chamber 101.

[0078] The liquid heater in the above embodiment limits the temperature of the heating chamber 101 to be obtained in real time by temperature sensor 60. When abnormal high temperature is detected, such as dry burning or malfunction, the power is automatically cut off to avoid equipment damage or fire. Moreover, precise temperature is set for different uses such as making soy milk, coffee, milk powder, etc., to improve the intelligence of the equipment.

[0079] In addition to the features of the above embodiments, this embodiment further specifies that: the liquid heater also includes a power supply module (not shown in the figure), the power supply module is electrically connected to the control circuit board 31, and the power supply module includes a rechargeable battery pack and / or a power supply interface.

[0080] The power supply interface can be connected to mains power to charge the rechargeable battery pack, which in turn supplies power to the heating base 20, control circuit board 31, etc. Alternatively, the power supply interface can be connected to mains power so that mains power can directly supply power to the heating base 20, control circuit board 31, etc.

[0081] The technical features of the above embodiments can be combined in any way. For the sake of brevity, not all possible combinations of the technical features in the above embodiments are described. However, as long as there is no contradiction in the combination of these technical features, they should be considered to be within the scope of this specification.

[0082] The above embodiments only illustrate several implementation methods of this utility model, and their descriptions are relatively specific and detailed, but they should not be construed as limiting the scope of the utility model patent. It should be noted that those skilled in the art can make various modifications and improvements without departing from the concept of this utility model, and these all fall within the protection scope of this utility model. Therefore, the protection scope of this utility model patent should be determined by the appended claims.

Claims

1. A liquid heater characterised in that, The utility model relates to a heating device, including: A shell assembly (10) is formed with a heating cavity (101) in the shell assembly (10), and a first through hole (102) is formed in the shell assembly (10) and communicates with the heating cavity (101); A heating seat (20) is used for heating the heating cavity (101); A control device (30) includes a control circuit board (31) and a control switch (32), the control switch (32) triggers the change of the switch state by the change of the external magnetic field, the control circuit board (31) is electrically connected with the control switch (32) and the heating seat (20) respectively, and the control circuit board (31) is configured to drive the heating seat (20) according to the working state of the control switch (32); A sealing plug (40) is at least partially made of magnetic material, and the sealing plug (40) has at least a first position and a second position, when the sealing plug (40) is located at the first position, the sealing plug (40) is assembled on the first through hole (102) and seals the first through hole (102), when the sealing plug (40) is located at the second position, the sealing plug (40) is assembled on the side of the shell assembly (10) near the control switch (32) and changes the working state of the control switch (32).

2. The liquid heater of claim 1, wherein, The sealing plug (40) includes a plug body (41) and a magnet (42), the plug body (41) is made of elastic material, the plug body (41) is wrapped around the magnet (42), and the plug body (41) is in interference fit with the side wall of the first through hole (102).

3. A liquid heater as claimed in claim 2, characterised in that, The plug body (41) is provided with a limiting portion (411) on the surface, when the sealing plug (40) is located at the first position, the limiting portion (411) is in clamping fit with the first through hole (102).

4. The liquid heater of claim 2, wherein, The sealing plug (40) further includes a connecting rope (43), and two ends of the connecting rope (43) are connected with the plug body (41) and the shell assembly (10) respectively.

5. The liquid heater of any one of claims 1-4, wherein, The shell assembly (10) includes an inner container (11), an outer shell (12) and a bottle cap (13), the outer shell (12) is sleeved on the periphery of the inner container (11), the inner container (11) is provided with the heating cavity (101), the bottle cap (13) is movably arranged on the outer shell (12) or the inner container (11), the bottle cap (13) is used for sealing the opening of the heating cavity (101), and the first through hole (102) is formed in the bottle cap (13).

6. The liquid heater of claim 5, wherein, The gap between the shell (12) and the inner container (11) forms a mounting cavity (103), the heating seat (20) and the control device (30) are in the mounting cavity (103), the surface of the shell (12) is provided with a first groove (104), the first groove (104) is arranged adjacent to the control switch (32), when the sealing plug (40) is in the second position, the sealing plug (40) is inserted in the first groove (104) and is arranged opposite to the control switch (32).

7. The liquid heater of claim 5, wherein, The shell (12) comprises a first shell (121) and a second shell (122), and the second shell (122) is movably and detachably connected with the bottle cap (13) and the first shell (121) respectively.

8. The liquid heater of claim 5, wherein, Further comprising a stirring device (50), the stirring device (50) comprises a driving motor (51) and a stirring paddle (52), the stirring paddle (52) is located in the heating cavity (101), and the output shaft of the driving motor (51) extends into the heating cavity (101) and is in transmission connection with the stirring paddle (52).

9. A liquid heater as claimed in claim 8, wherein The inner container (11) is a hollow shell structure with two open ends, the heating seat (20) is arranged on the opening of the inner container (11) away from the bottle cap (13), the heating seat (20) is provided with a second through hole (201), and the output shaft of the driving motor (51) extends into the heating cavity (101) after passing through the second through hole (201).

10. The liquid heater according to claim 1, wherein, The liquid heater further comprises a temperature sensor (60), the temperature sensor (60) is electrically connected with the control circuit board (31), and the temperature sensor (60) is used for monitoring the temperature change of the heating cavity (101); And / or, The liquid heater further comprises a power supply module, the power supply module is electrically connected with the control circuit board (31), and the power supply module comprises a rechargeable battery pack and / or a power supply interface.

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